Make the in-kernel AFS filesystem use AF_RXRPC instead of the old RxRPC code.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
config AFS_FS
tristate "Andrew File System support (AFS) (EXPERIMENTAL)"
depends on INET && EXPERIMENTAL
- select RXRPC
+ select AF_RXRPC
help
If you say Y here, you will get an experimental Andrew File System
driver. It currently only supports unsecured read-only AFS access.
If unsure, say N.
+config AFS_DEBUG
+ bool "AFS dynamic debugging"
+ depends on AFS_FS
+ help
+ Say Y here to make runtime controllable debugging messages appear.
+
+ See <file:Documentation/filesystems/afs.txt> for more information.
+
+ If unsure, say N.
+
+
config RXRPC
tristate
file.o \
fsclient.o \
inode.o \
- kafsasyncd.o \
- kafstimod.o \
main.o \
misc.o \
mntpt.o \
proc.o \
+ rxrpc.o \
server.o \
super.o \
vlclient.o \
-/* AFS types
+/* AFS common types
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* 2 of the License, or (at your option) any later version.
*/
-#ifndef AFS_TYPES_H
-#define AFS_TYPES_H
+#ifndef AFS_H
+#define AFS_H
-#include <rxrpc/types.h>
+#include <linux/in.h>
typedef unsigned afs_volid_t;
typedef unsigned afs_vnodeid_t;
AFS_FTYPE_SYMLINK = 3,
} afs_file_type_t;
-struct afs_cell;
-struct afs_vnode;
-
/*
* AFS file identifier
*/
} afs_callback_type_t;
struct afs_callback {
- struct afs_server *server; /* server that made the promise */
struct afs_fid fid; /* file identifier */
unsigned version; /* callback version */
unsigned expiry; /* time at which expires */
afs_callback_type_t type; /* type of callback */
};
-#define AFSCBMAX 50
+#define AFSCBMAX 50 /* maximum callbacks transferred per bulk op */
/*
* AFS volume information
afs_volid_t vid; /* volume ID */
afs_voltype_t type; /* type of this volume */
afs_volid_t type_vids[5]; /* volume ID's for possible types for this vol */
-
+
/* list of fileservers serving this volume */
size_t nservers; /* number of entries used in servers[] */
struct {
afs_file_type_t type; /* file type */
unsigned nlink; /* link count */
size_t size; /* file size */
- afs_dataversion_t version; /* current data version */
+ afs_dataversion_t data_version; /* current data version */
unsigned author; /* author ID */
unsigned owner; /* owner ID */
unsigned caller_access; /* access rights for authenticated caller */
time_t creation; /* volume creation time */
};
-#endif /* AFS_TYPES_H */
+#endif /* AFS_H */
--- /dev/null
+/* AFS Cache Manager definitions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef AFS_CM_H
+#define AFS_CM_H
+
+#define AFS_CM_PORT 7001 /* AFS file server port */
+#define CM_SERVICE 1 /* AFS File Service ID */
+
+enum AFS_CM_Operations {
+ CBCallBack = 204, /* break callback promises */
+ CBInitCallBackState = 205, /* initialise callback state */
+ CBProbe = 206, /* probe client */
+ CBGetLock = 207, /* get contents of CM lock table */
+ CBGetCE = 208, /* get cache file description */
+ CBGetXStatsVersion = 209, /* get version of extended statistics */
+ CBGetXStats = 210, /* get contents of extended statistics data */
+};
+
+#endif /* AFS_FS_H */
-/* AFS abort/error codes
+/* AFS File Service definitions
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* 2 of the License, or (at your option) any later version.
*/
-#ifndef AFS_ERRORS_H
-#define AFS_ERRORS_H
+#ifndef AFS_FS_H
+#define AFS_FS_H
-#include "types.h"
+#define AFS_FS_PORT 7000 /* AFS file server port */
+#define FS_SERVICE 1 /* AFS File Service ID */
-/*
- * file server abort codes
- */
-typedef enum {
+enum AFS_FS_Operations {
+ FSFETCHSTATUS = 132, /* AFS Fetch file status */
+ FSFETCHDATA = 130, /* AFS Fetch file data */
+ FSGIVEUPCALLBACKS = 147, /* AFS Discard callback promises */
+ FSGETVOLUMEINFO = 148, /* AFS Get root volume information */
+ FSGETROOTVOLUME = 151, /* AFS Get root volume name */
+ FSLOOKUP = 161 /* AFS lookup file in directory */
+};
+
+enum AFS_FS_Errors {
VSALVAGE = 101, /* volume needs salvaging */
VNOVNODE = 102, /* no such file/dir (vnode) */
VNOVOL = 103, /* no such volume or volume unavailable */
VOVERQUOTA = 109, /* volume's maximum quota exceeded */
VBUSY = 110, /* volume is temporarily unavailable */
VMOVED = 111, /* volume moved to new server - ask this FS where */
-} afs_rxfs_abort_t;
-
-extern int afs_abort_to_error(int);
+};
-#endif /* AFS_ERRORS_H */
+#endif /* AFS_FS_H */
-/* Volume Location Service client interface
+/* AFS Volume Location Service client interface
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* 2 of the License, or (at your option) any later version.
*/
-#ifndef AFS_VLCLIENT_H
-#define AFS_VLCLIENT_H
+#ifndef AFS_VL_H
+#define AFS_VL_H
-#include "types.h"
+#include "afs.h"
+
+#define AFS_VL_PORT 7003 /* volume location service port */
+#define VL_SERVICE 52 /* RxRPC service ID for the Volume Location service */
+
+enum AFSVL_Operations {
+ VLGETENTRYBYID = 503, /* AFS Get Cache Entry By ID operation ID */
+ VLGETENTRYBYNAME = 504, /* AFS Get Cache Entry By Name operation ID */
+ VLPROBE = 514, /* AFS Probe Volume Location Service operation ID */
+};
enum AFSVL_Errors {
AFSVL_IDEXIST = 363520, /* Volume Id entry exists in vl database */
AFSVL_BADVOLOPER = 363542, /* Bad volume operation code */
AFSVL_BADRELLOCKTYPE = 363543, /* Bad release lock type */
AFSVL_RERELEASE = 363544, /* Status report: last release was aborted */
- AFSVL_BADSERVERFLAG = 363545, /* Invalid replication site server °ag */
+ AFSVL_BADSERVERFLAG = 363545, /* Invalid replication site server °ag */
AFSVL_PERM = 363546, /* No permission access */
AFSVL_NOMEM = 363547, /* malloc/realloc failed to alloc enough memory */
};
-/* maps to "struct vldbentry" in vvl-spec.pdf */
+/*
+ * maps to "struct vldbentry" in vvl-spec.pdf
+ */
struct afs_vldbentry {
- char name[65]; /* name of volume (including NUL char) */
+ char name[65]; /* name of volume (with NUL char) */
afs_voltype_t type; /* volume type */
unsigned num_servers; /* num servers that hold instances of this vol */
unsigned clone_id; /* cloning ID */
} servers[8];
};
-extern int afs_rxvl_get_entry_by_name(struct afs_server *, const char *,
- unsigned, struct afs_cache_vlocation *);
-extern int afs_rxvl_get_entry_by_id(struct afs_server *, afs_volid_t,
- afs_voltype_t,
- struct afs_cache_vlocation *);
-
-extern int afs_rxvl_get_entry_by_id_async(struct afs_async_op *,
- afs_volid_t, afs_voltype_t);
-
-extern int afs_rxvl_get_entry_by_id_async2(struct afs_async_op *,
- struct afs_cache_vlocation *);
-
-#endif /* AFS_VLCLIENT_H */
+#endif /* AFS_VL_H */
--- /dev/null
+/* AFS caching stuff
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_cell_cache_match(void *target,
+ const void *entry);
+static void afs_cell_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_cache_cell_index_def = {
+ .name = "cell_ix",
+ .data_size = sizeof(struct afs_cache_cell),
+ .keys[0] = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
+ .match = afs_cell_cache_match,
+ .update = afs_cell_cache_update,
+};
+#endif
+
+/*
+ * match a cell record obtained from the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_cell_cache_match(void *target,
+ const void *entry)
+{
+ const struct afs_cache_cell *ccell = entry;
+ struct afs_cell *cell = target;
+
+ _enter("{%s},{%s}", ccell->name, cell->name);
+
+ if (strncmp(ccell->name, cell->name, sizeof(ccell->name)) == 0) {
+ _leave(" = SUCCESS");
+ return CACHEFS_MATCH_SUCCESS;
+ }
+
+ _leave(" = FAILED");
+ return CACHEFS_MATCH_FAILED;
+}
+#endif
+
+/*
+ * update a cell record in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_cell_cache_update(void *source, void *entry)
+{
+ struct afs_cache_cell *ccell = entry;
+ struct afs_cell *cell = source;
+
+ _enter("%p,%p", source, entry);
+
+ strncpy(ccell->name, cell->name, sizeof(ccell->name));
+
+ memcpy(ccell->vl_servers,
+ cell->vl_addrs,
+ min(sizeof(ccell->vl_servers), sizeof(cell->vl_addrs)));
+
+}
+#endif
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vlocation_cache_match(void *target,
+ const void *entry);
+static void afs_vlocation_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_vlocation_cache_index_def = {
+ .name = "vldb",
+ .data_size = sizeof(struct afs_cache_vlocation),
+ .keys[0] = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
+ .match = afs_vlocation_cache_match,
+ .update = afs_vlocation_cache_update,
+};
+#endif
+
+/*
+ * match a VLDB record stored in the cache
+ * - may also load target from entry
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vlocation_cache_match(void *target,
+ const void *entry)
+{
+ const struct afs_cache_vlocation *vldb = entry;
+ struct afs_vlocation *vlocation = target;
+
+ _enter("{%s},{%s}", vlocation->vldb.name, vldb->name);
+
+ if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0
+ ) {
+ if (!vlocation->valid ||
+ vlocation->vldb.rtime == vldb->rtime
+ ) {
+ vlocation->vldb = *vldb;
+ vlocation->valid = 1;
+ _leave(" = SUCCESS [c->m]");
+ return CACHEFS_MATCH_SUCCESS;
+ } else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) {
+ /* delete if VIDs for this name differ */
+ if (memcmp(&vlocation->vldb.vid,
+ &vldb->vid,
+ sizeof(vldb->vid)) != 0) {
+ _leave(" = DELETE");
+ return CACHEFS_MATCH_SUCCESS_DELETE;
+ }
+
+ _leave(" = UPDATE");
+ return CACHEFS_MATCH_SUCCESS_UPDATE;
+ } else {
+ _leave(" = SUCCESS");
+ return CACHEFS_MATCH_SUCCESS;
+ }
+ }
+
+ _leave(" = FAILED");
+ return CACHEFS_MATCH_FAILED;
+}
+#endif
+
+/*
+ * update a VLDB record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_vlocation_cache_update(void *source, void *entry)
+{
+ struct afs_cache_vlocation *vldb = entry;
+ struct afs_vlocation *vlocation = source;
+
+ _enter("");
+
+ *vldb = vlocation->vldb;
+}
+#endif
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_volume_cache_match(void *target,
+ const void *entry);
+static void afs_volume_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_volume_cache_index_def = {
+ .name = "volume",
+ .data_size = sizeof(struct afs_cache_vhash),
+ .keys[0] = { CACHEFS_INDEX_KEYS_BIN, 1 },
+ .keys[1] = { CACHEFS_INDEX_KEYS_BIN, 1 },
+ .match = afs_volume_cache_match,
+ .update = afs_volume_cache_update,
+};
+#endif
+
+/*
+ * match a volume hash record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_volume_cache_match(void *target,
+ const void *entry)
+{
+ const struct afs_cache_vhash *vhash = entry;
+ struct afs_volume *volume = target;
+
+ _enter("{%u},{%u}", volume->type, vhash->vtype);
+
+ if (volume->type == vhash->vtype) {
+ _leave(" = SUCCESS");
+ return CACHEFS_MATCH_SUCCESS;
+ }
+
+ _leave(" = FAILED");
+ return CACHEFS_MATCH_FAILED;
+}
+#endif
+
+/*
+ * update a volume hash record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_volume_cache_update(void *source, void *entry)
+{
+ struct afs_cache_vhash *vhash = entry;
+ struct afs_volume *volume = source;
+
+ _enter("");
+
+ vhash->vtype = volume->type;
+}
+#endif
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vnode_cache_match(void *target,
+ const void *entry);
+static void afs_vnode_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_vnode_cache_index_def = {
+ .name = "vnode",
+ .data_size = sizeof(struct afs_cache_vnode),
+ .keys[0] = { CACHEFS_INDEX_KEYS_BIN, 4 },
+ .match = afs_vnode_cache_match,
+ .update = afs_vnode_cache_update,
+};
+#endif
+
+/*
+ * match a vnode record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vnode_cache_match(void *target,
+ const void *entry)
+{
+ const struct afs_cache_vnode *cvnode = entry;
+ struct afs_vnode *vnode = target;
+
+ _enter("{%x,%x,%Lx},{%x,%x,%Lx}",
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ vnode->status.version,
+ cvnode->vnode_id,
+ cvnode->vnode_unique,
+ cvnode->data_version);
+
+ if (vnode->fid.vnode != cvnode->vnode_id) {
+ _leave(" = FAILED");
+ return CACHEFS_MATCH_FAILED;
+ }
+
+ if (vnode->fid.unique != cvnode->vnode_unique ||
+ vnode->status.version != cvnode->data_version) {
+ _leave(" = DELETE");
+ return CACHEFS_MATCH_SUCCESS_DELETE;
+ }
+
+ _leave(" = SUCCESS");
+ return CACHEFS_MATCH_SUCCESS;
+}
+#endif
+
+/*
+ * update a vnode record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_vnode_cache_update(void *source, void *entry)
+{
+ struct afs_cache_vnode *cvnode = entry;
+ struct afs_vnode *vnode = source;
+
+ _enter("");
+
+ cvnode->vnode_id = vnode->fid.vnode;
+ cvnode->vnode_unique = vnode->fid.unique;
+ cvnode->data_version = vnode->status.version;
+}
+#endif
/*
- * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
*
* This software may be freely redistributed under the terms of the
* GNU General Public License.
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
-#include "server.h"
-#include "vnode.h"
+#include <linux/circ_buf.h>
#include "internal.h"
-#include "cmservice.h"
+
+unsigned afs_vnode_update_timeout = 10;
+
+#define afs_breakring_space(server) \
+ CIRC_SPACE((server)->cb_break_head, (server)->cb_break_tail, \
+ ARRAY_SIZE((server)->cb_break))
+
+//static void afs_callback_updater(struct work_struct *);
+
+static struct workqueue_struct *afs_callback_update_worker;
/*
* allow the fileserver to request callback state (re-)initialisation
*/
-int SRXAFSCM_InitCallBackState(struct afs_server *server)
+void afs_init_callback_state(struct afs_server *server)
{
- struct list_head callbacks;
+ struct afs_vnode *vnode;
- _enter("%p", server);
+ _enter("{%p}", server);
- INIT_LIST_HEAD(&callbacks);
-
- /* transfer the callback list from the server to a temp holding area */
spin_lock(&server->cb_lock);
- list_add(&callbacks, &server->cb_promises);
- list_del_init(&server->cb_promises);
+ /* kill all the promises on record from this server */
+ while (!RB_EMPTY_ROOT(&server->cb_promises)) {
+ vnode = rb_entry(server->cb_promises.rb_node,
+ struct afs_vnode, cb_promise);
+ printk("\nUNPROMISE on %p\n", vnode);
+ rb_erase(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = false;
+ }
- /* munch our way through the list, grabbing the inode, dropping all the
- * locks and regetting them in the right order
- */
- while (!list_empty(&callbacks)) {
- struct afs_vnode *vnode;
- struct inode *inode;
+ spin_unlock(&server->cb_lock);
+ _leave("");
+}
- vnode = list_entry(callbacks.next, struct afs_vnode, cb_link);
- list_del_init(&vnode->cb_link);
+/*
+ * handle the data invalidation side of a callback being broken
+ */
+void afs_broken_callback_work(struct work_struct *work)
+{
+ struct afs_vnode *vnode =
+ container_of(work, struct afs_vnode, cb_broken_work);
- /* try and grab the inode - may fail */
- inode = igrab(AFS_VNODE_TO_I(vnode));
- if (inode) {
- int release = 0;
+ _enter("");
- spin_unlock(&server->cb_lock);
- spin_lock(&vnode->lock);
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ return;
- if (vnode->cb_server == server) {
- vnode->cb_server = NULL;
- afs_kafstimod_del_timer(&vnode->cb_timeout);
- spin_lock(&afs_cb_hash_lock);
- list_del_init(&vnode->cb_hash_link);
- spin_unlock(&afs_cb_hash_lock);
- release = 1;
- }
+ /* we're only interested in dealing with a broken callback on *this*
+ * vnode and only if no-one else has dealt with it yet */
+ if (!mutex_trylock(&vnode->cb_broken_lock))
+ return; /* someone else is dealing with it */
- spin_unlock(&vnode->lock);
+ if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
+ if (afs_vnode_fetch_status(vnode) < 0)
+ goto out;
- iput(inode);
- afs_put_server(server);
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ goto out;
- spin_lock(&server->cb_lock);
+ /* if the vnode's data version number changed then its contents
+ * are different */
+ if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
+ _debug("zap data");
+ invalidate_remote_inode(&vnode->vfs_inode);
}
}
- spin_unlock(&server->cb_lock);
+out:
+ mutex_unlock(&vnode->cb_broken_lock);
- _leave(" = 0");
- return 0;
+ /* avoid the potential race whereby the mutex_trylock() in this
+ * function happens again between the clear_bit() and the
+ * mutex_unlock() */
+ if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
+ _debug("requeue");
+ queue_work(afs_callback_update_worker, &vnode->cb_broken_work);
+ }
+ _leave("");
+}
+
+/*
+ * actually break a callback
+ */
+static void afs_break_callback(struct afs_server *server,
+ struct afs_vnode *vnode)
+{
+ _enter("");
+
+ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+
+ if (vnode->cb_promised) {
+ spin_lock(&vnode->lock);
+
+ _debug("break callback");
+
+ spin_lock(&server->cb_lock);
+ if (vnode->cb_promised) {
+ rb_erase(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = false;
+ }
+ spin_unlock(&server->cb_lock);
+
+ queue_work(afs_callback_update_worker, &vnode->cb_broken_work);
+ spin_unlock(&vnode->lock);
+ }
+}
+
+/*
+ * allow the fileserver to explicitly break one callback
+ * - happens when
+ * - the backing file is changed
+ * - a lock is released
+ */
+static void afs_break_one_callback(struct afs_server *server,
+ struct afs_fid *fid)
+{
+ struct afs_vnode *vnode;
+ struct rb_node *p;
+
+ _debug("find");
+ spin_lock(&server->fs_lock);
+ p = server->fs_vnodes.rb_node;
+ while (p) {
+ vnode = rb_entry(p, struct afs_vnode, server_rb);
+ if (fid->vid < vnode->fid.vid)
+ p = p->rb_left;
+ else if (fid->vid > vnode->fid.vid)
+ p = p->rb_right;
+ else if (fid->vnode < vnode->fid.vnode)
+ p = p->rb_left;
+ else if (fid->vnode > vnode->fid.vnode)
+ p = p->rb_right;
+ else if (fid->unique < vnode->fid.unique)
+ p = p->rb_left;
+ else if (fid->unique > vnode->fid.unique)
+ p = p->rb_right;
+ else
+ goto found;
+ }
+
+ /* not found so we just ignore it (it may have moved to another
+ * server) */
+not_available:
+ _debug("not avail");
+ spin_unlock(&server->fs_lock);
+ _leave("");
+ return;
+
+found:
+ _debug("found");
+ ASSERTCMP(server, ==, vnode->server);
+
+ if (!igrab(AFS_VNODE_TO_I(vnode)))
+ goto not_available;
+ spin_unlock(&server->fs_lock);
+
+ afs_break_callback(server, vnode);
+ iput(&vnode->vfs_inode);
+ _leave("");
}
/*
* allow the fileserver to break callback promises
*/
-int SRXAFSCM_CallBack(struct afs_server *server, size_t count,
- struct afs_callback callbacks[])
+void afs_break_callbacks(struct afs_server *server, size_t count,
+ struct afs_callback callbacks[])
{
- _enter("%p,%u,", server, count);
+ _enter("%p,%zu,", server, count);
- for (; count > 0; callbacks++, count--) {
- struct afs_vnode *vnode = NULL;
- struct inode *inode = NULL;
- int valid = 0;
+ ASSERT(server != NULL);
+ ASSERTCMP(count, <=, AFSCBMAX);
+ for (; count > 0; callbacks++, count--) {
_debug("- Fid { vl=%08x n=%u u=%u } CB { v=%u x=%u t=%u }",
callbacks->fid.vid,
callbacks->fid.vnode,
callbacks->expiry,
callbacks->type
);
+ afs_break_one_callback(server, &callbacks->fid);
+ }
+
+ _leave("");
+ return;
+}
- /* find the inode for this fid */
- spin_lock(&afs_cb_hash_lock);
+/*
+ * record the callback for breaking
+ * - the caller must hold server->cb_lock
+ */
+static void afs_do_give_up_callback(struct afs_server *server,
+ struct afs_vnode *vnode)
+{
+ struct afs_callback *cb;
- list_for_each_entry(vnode,
- &afs_cb_hash(server, &callbacks->fid),
- cb_hash_link) {
- if (memcmp(&vnode->fid, &callbacks->fid,
- sizeof(struct afs_fid)) != 0)
- continue;
+ _enter("%p,%p", server, vnode);
- /* right vnode, but is it same server? */
- if (vnode->cb_server != server)
- break; /* no */
+ cb = &server->cb_break[server->cb_break_head];
+ cb->fid = vnode->fid;
+ cb->version = vnode->cb_version;
+ cb->expiry = vnode->cb_expiry;
+ cb->type = vnode->cb_type;
+ smp_wmb();
+ server->cb_break_head =
+ (server->cb_break_head + 1) &
+ (ARRAY_SIZE(server->cb_break) - 1);
- /* try and nail the inode down */
- inode = igrab(AFS_VNODE_TO_I(vnode));
- break;
+ /* defer the breaking of callbacks to try and collect as many as
+ * possible to ship in one operation */
+ switch (atomic_inc_return(&server->cb_break_n)) {
+ case 1 ... AFSCBMAX - 1:
+ queue_delayed_work(afs_callback_update_worker,
+ &server->cb_break_work, HZ * 2);
+ break;
+ case AFSCBMAX:
+ afs_flush_callback_breaks(server);
+ break;
+ default:
+ break;
+ }
+
+ ASSERT(server->cb_promises.rb_node != NULL);
+ rb_erase(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = false;
+ _leave("");
+}
+
+/*
+ * give up the callback registered for a vnode on the file server when the
+ * inode is being cleared
+ */
+void afs_give_up_callback(struct afs_vnode *vnode)
+{
+ struct afs_server *server = vnode->server;
+
+ DECLARE_WAITQUEUE(myself, current);
+
+ _enter("%d", vnode->cb_promised);
+
+ _debug("GIVE UP INODE %p", &vnode->vfs_inode);
+
+ if (!vnode->cb_promised) {
+ _leave(" [not promised]");
+ return;
+ }
+
+ ASSERT(server != NULL);
+
+ spin_lock(&server->cb_lock);
+ if (vnode->cb_promised && afs_breakring_space(server) == 0) {
+ add_wait_queue(&server->cb_break_waitq, &myself);
+ for (;;) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (!vnode->cb_promised ||
+ afs_breakring_space(server) != 0)
+ break;
+ spin_unlock(&server->cb_lock);
+ schedule();
+ spin_lock(&server->cb_lock);
}
+ remove_wait_queue(&server->cb_break_waitq, &myself);
+ __set_current_state(TASK_RUNNING);
+ }
+
+ /* of course, it's always possible for the server to break this vnode's
+ * callback first... */
+ if (vnode->cb_promised)
+ afs_do_give_up_callback(server, vnode);
+
+ spin_unlock(&server->cb_lock);
+ _leave("");
+}
+
+/*
+ * dispatch a deferred give up callbacks operation
+ */
+void afs_dispatch_give_up_callbacks(struct work_struct *work)
+{
+ struct afs_server *server =
+ container_of(work, struct afs_server, cb_break_work.work);
+
+ _enter("");
+
+ /* tell the fileserver to discard the callback promises it has
+ * - in the event of ENOMEM or some other error, we just forget that we
+ * had callbacks entirely, and the server will call us later to break
+ * them
+ */
+ afs_fs_give_up_callbacks(server, &afs_async_call);
+}
+
+/*
+ * flush the outstanding callback breaks on a server
+ */
+void afs_flush_callback_breaks(struct afs_server *server)
+{
+ cancel_delayed_work(&server->cb_break_work);
+ queue_delayed_work(afs_callback_update_worker,
+ &server->cb_break_work, 0);
+}
+
+#if 0
+/*
+ * update a bunch of callbacks
+ */
+static void afs_callback_updater(struct work_struct *work)
+{
+ struct afs_server *server;
+ struct afs_vnode *vnode, *xvnode;
+ time_t now;
+ long timeout;
+ int ret;
+
+ server = container_of(work, struct afs_server, updater);
+
+ _enter("");
- spin_unlock(&afs_cb_hash_lock);
-
- if (inode) {
- /* we've found the record for this vnode */
- spin_lock(&vnode->lock);
- if (vnode->cb_server == server) {
- /* the callback _is_ on the calling server */
- vnode->cb_server = NULL;
- valid = 1;
-
- afs_kafstimod_del_timer(&vnode->cb_timeout);
- vnode->flags |= AFS_VNODE_CHANGED;
-
- spin_lock(&server->cb_lock);
- list_del_init(&vnode->cb_link);
- spin_unlock(&server->cb_lock);
-
- spin_lock(&afs_cb_hash_lock);
- list_del_init(&vnode->cb_hash_link);
- spin_unlock(&afs_cb_hash_lock);
- }
- spin_unlock(&vnode->lock);
-
- if (valid) {
- invalidate_remote_inode(inode);
- afs_put_server(server);
- }
- iput(inode);
+ now = get_seconds();
+
+ /* find the first vnode to update */
+ spin_lock(&server->cb_lock);
+ for (;;) {
+ if (RB_EMPTY_ROOT(&server->cb_promises)) {
+ spin_unlock(&server->cb_lock);
+ _leave(" [nothing]");
+ return;
}
+
+ vnode = rb_entry(rb_first(&server->cb_promises),
+ struct afs_vnode, cb_promise);
+ if (atomic_read(&vnode->usage) > 0)
+ break;
+ rb_erase(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = false;
+ }
+
+ timeout = vnode->update_at - now;
+ if (timeout > 0) {
+ queue_delayed_work(afs_vnode_update_worker,
+ &afs_vnode_update, timeout * HZ);
+ spin_unlock(&server->cb_lock);
+ _leave(" [nothing]");
+ return;
+ }
+
+ list_del_init(&vnode->update);
+ atomic_inc(&vnode->usage);
+ spin_unlock(&server->cb_lock);
+
+ /* we can now perform the update */
+ _debug("update %s", vnode->vldb.name);
+ vnode->state = AFS_VL_UPDATING;
+ vnode->upd_rej_cnt = 0;
+ vnode->upd_busy_cnt = 0;
+
+ ret = afs_vnode_update_record(vl, &vldb);
+ switch (ret) {
+ case 0:
+ afs_vnode_apply_update(vl, &vldb);
+ vnode->state = AFS_VL_UPDATING;
+ break;
+ case -ENOMEDIUM:
+ vnode->state = AFS_VL_VOLUME_DELETED;
+ break;
+ default:
+ vnode->state = AFS_VL_UNCERTAIN;
+ break;
+ }
+
+ /* and then reschedule */
+ _debug("reschedule");
+ vnode->update_at = get_seconds() + afs_vnode_update_timeout;
+
+ spin_lock(&server->cb_lock);
+
+ if (!list_empty(&server->cb_promises)) {
+ /* next update in 10 minutes, but wait at least 1 second more
+ * than the newest record already queued so that we don't spam
+ * the VL server suddenly with lots of requests
+ */
+ xvnode = list_entry(server->cb_promises.prev,
+ struct afs_vnode, update);
+ if (vnode->update_at <= xvnode->update_at)
+ vnode->update_at = xvnode->update_at + 1;
+ xvnode = list_entry(server->cb_promises.next,
+ struct afs_vnode, update);
+ timeout = xvnode->update_at - now;
+ if (timeout < 0)
+ timeout = 0;
+ } else {
+ timeout = afs_vnode_update_timeout;
}
- _leave(" = 0");
- return 0;
+ list_add_tail(&vnode->update, &server->cb_promises);
+
+ _debug("timeout %ld", timeout);
+ queue_delayed_work(afs_vnode_update_worker,
+ &afs_vnode_update, timeout * HZ);
+ spin_unlock(&server->cb_lock);
+ afs_put_vnode(vl);
+}
+#endif
+
+/*
+ * initialise the callback update process
+ */
+int __init afs_callback_update_init(void)
+{
+ afs_callback_update_worker =
+ create_singlethread_workqueue("kafs_callbackd");
+ return afs_callback_update_worker ? 0 : -ENOMEM;
}
/*
- * allow the fileserver to see if the cache manager is still alive
+ * shut down the callback update process
*/
-int SRXAFSCM_Probe(struct afs_server *server)
+void __exit afs_callback_update_kill(void)
{
- _debug("SRXAFSCM_Probe(%p)\n", server);
- return 0;
+ destroy_workqueue(afs_callback_update_worker);
}
#include <linux/module.h>
#include <linux/slab.h>
-#include <rxrpc/peer.h>
-#include <rxrpc/connection.h>
-#include "volume.h"
-#include "cell.h"
-#include "server.h"
-#include "transport.h"
-#include "vlclient.h"
-#include "kafstimod.h"
-#include "super.h"
#include "internal.h"
DECLARE_RWSEM(afs_proc_cells_sem);
static struct list_head afs_cells = LIST_HEAD_INIT(afs_cells);
static DEFINE_RWLOCK(afs_cells_lock);
static DECLARE_RWSEM(afs_cells_sem); /* add/remove serialisation */
+static DECLARE_WAIT_QUEUE_HEAD(afs_cells_freeable_wq);
static struct afs_cell *afs_cell_root;
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_cell_cache_match(void *target,
- const void *entry);
-static void afs_cell_cache_update(void *source, void *entry);
-
-struct cachefs_index_def afs_cache_cell_index_def = {
- .name = "cell_ix",
- .data_size = sizeof(struct afs_cache_cell),
- .keys[0] = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
- .match = afs_cell_cache_match,
- .update = afs_cell_cache_update,
-};
-#endif
-
/*
* create a cell record
* - "name" is the name of the cell
* - "vllist" is a colon separated list of IP addresses in "a.b.c.d" format
*/
-int afs_cell_create(const char *name, char *vllist, struct afs_cell **_cell)
+struct afs_cell *afs_cell_create(const char *name, char *vllist)
{
struct afs_cell *cell;
char *next;
int ret;
- _enter("%s", name);
+ _enter("%s,%s", name, vllist);
BUG_ON(!name); /* TODO: want to look up "this cell" in the cache */
cell = kmalloc(sizeof(struct afs_cell) + strlen(name) + 1, GFP_KERNEL);
if (!cell) {
_leave(" = -ENOMEM");
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
}
down_write(&afs_cells_sem);
memset(cell, 0, sizeof(struct afs_cell));
- atomic_set(&cell->usage, 0);
+ atomic_set(&cell->usage, 1);
INIT_LIST_HEAD(&cell->link);
- rwlock_init(&cell->sv_lock);
- INIT_LIST_HEAD(&cell->sv_list);
- INIT_LIST_HEAD(&cell->sv_graveyard);
- spin_lock_init(&cell->sv_gylock);
+ rwlock_init(&cell->servers_lock);
+ INIT_LIST_HEAD(&cell->servers);
init_rwsem(&cell->vl_sem);
INIT_LIST_HEAD(&cell->vl_list);
- INIT_LIST_HEAD(&cell->vl_graveyard);
- spin_lock_init(&cell->vl_gylock);
+ spin_lock_init(&cell->vl_lock);
- strcpy(cell->name,name);
+ strcpy(cell->name, name);
/* fill in the VL server list from the rest of the string */
ret = -EINVAL;
if (cell->vl_naddrs >= AFS_CELL_MAX_ADDRS)
break;
- } while(vllist = next, vllist);
+ } while ((vllist = next));
- /* add a proc dir for this cell */
+ /* add a proc directory for this cell */
ret = afs_proc_cell_setup(cell);
if (ret < 0)
goto error;
down_write(&afs_proc_cells_sem);
list_add_tail(&cell->proc_link, &afs_proc_cells);
up_write(&afs_proc_cells_sem);
-
- *_cell = cell;
up_write(&afs_cells_sem);
- _leave(" = 0 (%p)", cell);
- return 0;
+ _leave(" = %p", cell);
+ return cell;
badaddr:
- printk(KERN_ERR "kAFS: bad VL server IP address: '%s'\n", vllist);
+ printk(KERN_ERR "kAFS: bad VL server IP address\n");
error:
up_write(&afs_cells_sem);
kfree(cell);
_leave(" = %d", ret);
- return ret;
+ return ERR_PTR(ret);
}
/*
- * initialise the cell database from module parameters
+ * set the root cell information
+ * - can be called with a module parameter string
+ * - can be called from a write to /proc/fs/afs/rootcell
*/
int afs_cell_init(char *rootcell)
{
struct afs_cell *old_root, *new_root;
char *cp;
- int ret;
_enter("");
/* module is loaded with no parameters, or built statically.
* - in the future we might initialize cell DB here.
*/
- _leave(" = 0 (but no root)");
+ _leave(" = 0 [no root]");
return 0;
}
cp = strchr(rootcell, ':');
if (!cp) {
printk(KERN_ERR "kAFS: no VL server IP addresses specified\n");
- _leave(" = %d (no colon)", -EINVAL);
+ _leave(" = -EINVAL");
return -EINVAL;
}
/* allocate a cell record for the root cell */
*cp++ = 0;
- ret = afs_cell_create(rootcell, cp, &new_root);
- if (ret < 0) {
- _leave(" = %d", ret);
- return ret;
+ new_root = afs_cell_create(rootcell, cp);
+ if (IS_ERR(new_root)) {
+ _leave(" = %ld", PTR_ERR(new_root));
+ return PTR_ERR(new_root);
}
- /* as afs_put_cell() takes locks by itself, we have to do
- * a little gymnastics to be race-free.
- */
- afs_get_cell(new_root);
-
+ /* install the new cell */
write_lock(&afs_cells_lock);
- while (afs_cell_root) {
- old_root = afs_cell_root;
- afs_cell_root = NULL;
- write_unlock(&afs_cells_lock);
- afs_put_cell(old_root);
- write_lock(&afs_cells_lock);
- }
+ old_root = afs_cell_root;
afs_cell_root = new_root;
write_unlock(&afs_cells_lock);
+ afs_put_cell(old_root);
- _leave(" = %d", ret);
- return ret;
+ _leave(" = 0");
+ return 0;
}
/*
* lookup a cell record
*/
-int afs_cell_lookup(const char *name, unsigned namesz, struct afs_cell **_cell)
+struct afs_cell *afs_cell_lookup(const char *name, unsigned namesz)
{
struct afs_cell *cell;
- int ret;
_enter("\"%*.*s\",", namesz, namesz, name ? name : "");
- *_cell = NULL;
+ down_read(&afs_cells_sem);
+ read_lock(&afs_cells_lock);
if (name) {
/* if the cell was named, look for it in the cell record list */
- ret = -ENOENT;
- cell = NULL;
- read_lock(&afs_cells_lock);
-
list_for_each_entry(cell, &afs_cells, link) {
if (strncmp(cell->name, name, namesz) == 0) {
afs_get_cell(cell);
goto found;
}
}
- cell = NULL;
+ cell = ERR_PTR(-ENOENT);
found:
-
- read_unlock(&afs_cells_lock);
-
- if (cell)
- ret = 0;
+ ;
} else {
- read_lock(&afs_cells_lock);
-
cell = afs_cell_root;
if (!cell) {
/* this should not happen unless user tries to mount
* ENOENT might be "more appropriate" but they happen
* for other reasons.
*/
- ret = -EDESTADDRREQ;
+ cell = ERR_PTR(-EDESTADDRREQ);
} else {
afs_get_cell(cell);
- ret = 0;
}
- read_unlock(&afs_cells_lock);
}
- *_cell = cell;
- _leave(" = %d (%p)", ret, cell);
- return ret;
+ read_unlock(&afs_cells_lock);
+ up_read(&afs_cells_sem);
+ _leave(" = %p", cell);
+ return cell;
}
/*
* try and get a cell record
*/
-struct afs_cell *afs_get_cell_maybe(struct afs_cell **_cell)
+struct afs_cell *afs_get_cell_maybe(struct afs_cell *cell)
{
- struct afs_cell *cell;
-
write_lock(&afs_cells_lock);
- cell = *_cell;
if (cell && !list_empty(&cell->link))
afs_get_cell(cell);
else
cell = NULL;
write_unlock(&afs_cells_lock);
-
return cell;
}
_enter("%p{%d,%s}", cell, atomic_read(&cell->usage), cell->name);
- /* sanity check */
- BUG_ON(atomic_read(&cell->usage) <= 0);
+ ASSERTCMP(atomic_read(&cell->usage), >, 0);
/* to prevent a race, the decrement and the dequeue must be effectively
* atomic */
return;
}
+ ASSERT(list_empty(&cell->servers));
+ ASSERT(list_empty(&cell->vl_list));
+
write_unlock(&afs_cells_lock);
- BUG_ON(!list_empty(&cell->sv_list));
- BUG_ON(!list_empty(&cell->sv_graveyard));
- BUG_ON(!list_empty(&cell->vl_list));
- BUG_ON(!list_empty(&cell->vl_graveyard));
+ wake_up(&afs_cells_freeable_wq);
_leave(" [unused]");
}
/*
* destroy a cell record
+ * - must be called with the afs_cells_sem write-locked
+ * - cell->link should have been broken by the caller
*/
static void afs_cell_destroy(struct afs_cell *cell)
{
_enter("%p{%d,%s}", cell, atomic_read(&cell->usage), cell->name);
- /* to prevent a race, the decrement and the dequeue must be effectively
- * atomic */
- write_lock(&afs_cells_lock);
+ ASSERTCMP(atomic_read(&cell->usage), >=, 0);
+ ASSERT(list_empty(&cell->link));
- /* sanity check */
- BUG_ON(atomic_read(&cell->usage) != 0);
+ /* wait for everyone to stop using the cell */
+ if (atomic_read(&cell->usage) > 0) {
+ DECLARE_WAITQUEUE(myself, current);
- list_del_init(&cell->link);
+ _debug("wait for cell %s", cell->name);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&afs_cells_freeable_wq, &myself);
- write_unlock(&afs_cells_lock);
+ while (atomic_read(&cell->usage) > 0) {
+ schedule();
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ }
- down_write(&afs_cells_sem);
+ remove_wait_queue(&afs_cells_freeable_wq, &myself);
+ set_current_state(TASK_RUNNING);
+ }
+
+ _debug("cell dead");
+ ASSERTCMP(atomic_read(&cell->usage), ==, 0);
+ ASSERT(list_empty(&cell->servers));
+ ASSERT(list_empty(&cell->vl_list));
afs_proc_cell_remove(cell);
cachefs_relinquish_cookie(cell->cache, 0);
#endif
- up_write(&afs_cells_sem);
-
- BUG_ON(!list_empty(&cell->sv_list));
- BUG_ON(!list_empty(&cell->sv_graveyard));
- BUG_ON(!list_empty(&cell->vl_list));
- BUG_ON(!list_empty(&cell->vl_graveyard));
-
- /* finish cleaning up the cell */
kfree(cell);
_leave(" [destroyed]");
}
/*
- * lookup the server record corresponding to an Rx RPC peer
- */
-int afs_server_find_by_peer(const struct rxrpc_peer *peer,
- struct afs_server **_server)
-{
- struct afs_server *server;
- struct afs_cell *cell;
-
- _enter("%p{a=%08x},", peer, ntohl(peer->addr.s_addr));
-
- /* search the cell list */
- read_lock(&afs_cells_lock);
-
- list_for_each_entry(cell, &afs_cells, link) {
-
- _debug("? cell %s",cell->name);
-
- write_lock(&cell->sv_lock);
-
- /* check the active list */
- list_for_each_entry(server, &cell->sv_list, link) {
- _debug("?? server %08x", ntohl(server->addr.s_addr));
-
- if (memcmp(&server->addr, &peer->addr,
- sizeof(struct in_addr)) == 0)
- goto found_server;
- }
-
- /* check the inactive list */
- spin_lock(&cell->sv_gylock);
- list_for_each_entry(server, &cell->sv_graveyard, link) {
- _debug("?? dead server %08x",
- ntohl(server->addr.s_addr));
-
- if (memcmp(&server->addr, &peer->addr,
- sizeof(struct in_addr)) == 0)
- goto found_dead_server;
- }
- spin_unlock(&cell->sv_gylock);
-
- write_unlock(&cell->sv_lock);
- }
- read_unlock(&afs_cells_lock);
-
- _leave(" = -ENOENT");
- return -ENOENT;
-
- /* we found it in the graveyard - resurrect it */
-found_dead_server:
- list_move_tail(&server->link, &cell->sv_list);
- afs_get_server(server);
- afs_kafstimod_del_timer(&server->timeout);
- spin_unlock(&cell->sv_gylock);
- goto success;
-
- /* we found it - increment its ref count and return it */
-found_server:
- afs_get_server(server);
-
-success:
- write_unlock(&cell->sv_lock);
- read_unlock(&afs_cells_lock);
-
- *_server = server;
- _leave(" = 0 (s=%p c=%p)", server, cell);
- return 0;
-}
-
-/*
* purge in-memory cell database on module unload or afs_init() failure
* - the timeout daemon is stopped before calling this
*/
void afs_cell_purge(void)
{
- struct afs_vlocation *vlocation;
struct afs_cell *cell;
_enter("");
afs_put_cell(afs_cell_root);
+ down_write(&afs_cells_sem);
+
while (!list_empty(&afs_cells)) {
cell = NULL;
_debug("PURGING CELL %s (%d)",
cell->name, atomic_read(&cell->usage));
- BUG_ON(!list_empty(&cell->sv_list));
- BUG_ON(!list_empty(&cell->vl_list));
-
- /* purge the cell's VL graveyard list */
- _debug(" - clearing VL graveyard");
-
- spin_lock(&cell->vl_gylock);
-
- while (!list_empty(&cell->vl_graveyard)) {
- vlocation = list_entry(cell->vl_graveyard.next,
- struct afs_vlocation,
- link);
- list_del_init(&vlocation->link);
-
- afs_kafstimod_del_timer(&vlocation->timeout);
-
- spin_unlock(&cell->vl_gylock);
-
- afs_vlocation_do_timeout(vlocation);
- /* TODO: race if move to use krxtimod instead
- * of kafstimod */
-
- spin_lock(&cell->vl_gylock);
- }
-
- spin_unlock(&cell->vl_gylock);
-
- /* purge the cell's server graveyard list */
- _debug(" - clearing server graveyard");
-
- spin_lock(&cell->sv_gylock);
-
- while (!list_empty(&cell->sv_graveyard)) {
- struct afs_server *server;
-
- server = list_entry(cell->sv_graveyard.next,
- struct afs_server, link);
- list_del_init(&server->link);
-
- afs_kafstimod_del_timer(&server->timeout);
-
- spin_unlock(&cell->sv_gylock);
-
- afs_server_do_timeout(server);
-
- spin_lock(&cell->sv_gylock);
- }
-
- spin_unlock(&cell->sv_gylock);
-
/* now the cell should be left with no references */
afs_cell_destroy(cell);
}
}
+ up_write(&afs_cells_sem);
_leave("");
}
-
-/*
- * match a cell record obtained from the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_cell_cache_match(void *target,
- const void *entry)
-{
- const struct afs_cache_cell *ccell = entry;
- struct afs_cell *cell = target;
-
- _enter("{%s},{%s}", ccell->name, cell->name);
-
- if (strncmp(ccell->name, cell->name, sizeof(ccell->name)) == 0) {
- _leave(" = SUCCESS");
- return CACHEFS_MATCH_SUCCESS;
- }
-
- _leave(" = FAILED");
- return CACHEFS_MATCH_FAILED;
-}
-#endif
-
-/*
- * update a cell record in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static void afs_cell_cache_update(void *source, void *entry)
-{
- struct afs_cache_cell *ccell = entry;
- struct afs_cell *cell = source;
-
- _enter("%p,%p", source, entry);
-
- strncpy(ccell->name, cell->name, sizeof(ccell->name));
-
- memcpy(ccell->vl_servers,
- cell->vl_addrs,
- min(sizeof(ccell->vl_servers), sizeof(cell->vl_addrs)));
-
-}
-#endif
+++ /dev/null
-/* AFS cell record
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_CELL_H
-#define AFS_CELL_H
-
-#include "types.h"
-#include "cache.h"
-
-#define AFS_CELL_MAX_ADDRS 15
-
-extern volatile int afs_cells_being_purged; /* T when cells are being purged by rmmod */
-
-/*
- * entry in the cached cell catalogue
- */
-struct afs_cache_cell {
- char name[64]; /* cell name (padded with NULs) */
- struct in_addr vl_servers[15]; /* cached cell VL servers */
-};
-
-/*
- * AFS cell record
- */
-struct afs_cell {
- atomic_t usage;
- struct list_head link; /* main cell list link */
- struct list_head proc_link; /* /proc cell list link */
- struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
-#ifdef AFS_CACHING_SUPPORT
- struct cachefs_cookie *cache; /* caching cookie */
-#endif
-
- /* server record management */
- rwlock_t sv_lock; /* active server list lock */
- struct list_head sv_list; /* active server list */
- struct list_head sv_graveyard; /* inactive server list */
- spinlock_t sv_gylock; /* inactive server list lock */
-
- /* volume location record management */
- struct rw_semaphore vl_sem; /* volume management serialisation semaphore */
- struct list_head vl_list; /* cell's active VL record list */
- struct list_head vl_graveyard; /* cell's inactive VL record list */
- spinlock_t vl_gylock; /* graveyard lock */
- unsigned short vl_naddrs; /* number of VL servers in addr list */
- unsigned short vl_curr_svix; /* current server index */
- struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */
-
- char name[0]; /* cell name - must go last */
-};
-
-extern int afs_cell_init(char *);
-extern int afs_cell_create(const char *, char *, struct afs_cell **);
-extern int afs_cell_lookup(const char *, unsigned, struct afs_cell **);
-
-#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
-
-extern struct afs_cell *afs_get_cell_maybe(struct afs_cell **);
-extern void afs_put_cell(struct afs_cell *);
-extern void afs_cell_purge(void);
-
-#endif /* AFS_CELL_H */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
-#include <linux/completion.h>
-#include "server.h"
-#include "cell.h"
-#include "transport.h"
-#include <rxrpc/rxrpc.h>
-#include <rxrpc/transport.h>
-#include <rxrpc/connection.h>
-#include <rxrpc/call.h>
-#include "cmservice.h"
+#include <linux/ip.h>
#include "internal.h"
+#include "afs_cm.h"
-static unsigned afscm_usage; /* AFS cache manager usage count */
-static struct rw_semaphore afscm_sem; /* AFS cache manager start/stop semaphore */
-
-static int afscm_new_call(struct rxrpc_call *call);
-static void afscm_attention(struct rxrpc_call *call);
-static void afscm_error(struct rxrpc_call *call);
-static void afscm_aemap(struct rxrpc_call *call);
-
-static void _SRXAFSCM_CallBack(struct rxrpc_call *call);
-static void _SRXAFSCM_InitCallBackState(struct rxrpc_call *call);
-static void _SRXAFSCM_Probe(struct rxrpc_call *call);
-
-typedef void (*_SRXAFSCM_xxxx_t)(struct rxrpc_call *call);
-
-static const struct rxrpc_operation AFSCM_ops[] = {
- {
- .id = 204,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "CallBack",
- .user = _SRXAFSCM_CallBack,
- },
- {
- .id = 205,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "InitCallBackState",
- .user = _SRXAFSCM_InitCallBackState,
- },
- {
- .id = 206,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "Probe",
- .user = _SRXAFSCM_Probe,
- },
-#if 0
- {
- .id = 207,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "GetLock",
- .user = _SRXAFSCM_GetLock,
- },
- {
- .id = 208,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "GetCE",
- .user = _SRXAFSCM_GetCE,
- },
- {
- .id = 209,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "GetXStatsVersion",
- .user = _SRXAFSCM_GetXStatsVersion,
- },
- {
- .id = 210,
- .asize = RXRPC_APP_MARK_EOF,
- .name = "GetXStats",
- .user = _SRXAFSCM_GetXStats,
- }
-#endif
-};
+struct workqueue_struct *afs_cm_workqueue;
-static struct rxrpc_service AFSCM_service = {
- .name = "AFS/CM",
- .owner = THIS_MODULE,
- .link = LIST_HEAD_INIT(AFSCM_service.link),
- .new_call = afscm_new_call,
- .service_id = 1,
- .attn_func = afscm_attention,
- .error_func = afscm_error,
- .aemap_func = afscm_aemap,
- .ops_begin = &AFSCM_ops[0],
- .ops_end = &AFSCM_ops[ARRAY_SIZE(AFSCM_ops)],
-};
-
-static DECLARE_COMPLETION(kafscmd_alive);
-static DECLARE_COMPLETION(kafscmd_dead);
-static DECLARE_WAIT_QUEUE_HEAD(kafscmd_sleepq);
-static LIST_HEAD(kafscmd_attention_list);
-static LIST_HEAD(afscm_calls);
-static DEFINE_SPINLOCK(afscm_calls_lock);
-static DEFINE_SPINLOCK(kafscmd_attention_lock);
-static int kafscmd_die;
+static int afs_deliver_cb_init_call_back_state(struct afs_call *,
+ struct sk_buff *, bool);
+static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
+static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
+static void afs_cm_destructor(struct afs_call *);
/*
- * AFS Cache Manager kernel thread
+ * CB.CallBack operation type
*/
-static int kafscmd(void *arg)
-{
- DECLARE_WAITQUEUE(myself, current);
-
- struct rxrpc_call *call;
- _SRXAFSCM_xxxx_t func;
- int die;
-
- printk(KERN_INFO "kAFS: Started kafscmd %d\n", current->pid);
-
- daemonize("kafscmd");
-
- complete(&kafscmd_alive);
-
- /* loop around looking for things to attend to */
- do {
- if (list_empty(&kafscmd_attention_list)) {
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&kafscmd_sleepq, &myself);
-
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (!list_empty(&kafscmd_attention_list) ||
- signal_pending(current) ||
- kafscmd_die)
- break;
-
- schedule();
- }
-
- remove_wait_queue(&kafscmd_sleepq, &myself);
- set_current_state(TASK_RUNNING);
- }
-
- die = kafscmd_die;
-
- /* dequeue the next call requiring attention */
- call = NULL;
- spin_lock(&kafscmd_attention_lock);
-
- if (!list_empty(&kafscmd_attention_list)) {
- call = list_entry(kafscmd_attention_list.next,
- struct rxrpc_call,
- app_attn_link);
- list_del_init(&call->app_attn_link);
- die = 0;
- }
-
- spin_unlock(&kafscmd_attention_lock);
-
- if (call) {
- /* act upon it */
- _debug("@@@ Begin Attend Call %p", call);
-
- func = call->app_user;
- if (func)
- func(call);
-
- rxrpc_put_call(call);
-
- _debug("@@@ End Attend Call %p", call);
- }
-
- } while(!die);
-
- /* and that's all */
- complete_and_exit(&kafscmd_dead, 0);
-}
+static const struct afs_call_type afs_SRXCBCallBack = {
+ .deliver = afs_deliver_cb_callback,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_cm_destructor,
+};
/*
- * handle a call coming in to the cache manager
- * - if I want to keep the call, I must increment its usage count
- * - the return value will be negated and passed back in an abort packet if
- * non-zero
- * - serialised by virtue of there only being one krxiod
+ * CB.InitCallBackState operation type
*/
-static int afscm_new_call(struct rxrpc_call *call)
-{
- _enter("%p{cid=%u u=%d}",
- call, ntohl(call->call_id), atomic_read(&call->usage));
-
- rxrpc_get_call(call);
-
- /* add to my current call list */
- spin_lock(&afscm_calls_lock);
- list_add(&call->app_link,&afscm_calls);
- spin_unlock(&afscm_calls_lock);
-
- _leave(" = 0");
- return 0;
-}
+static const struct afs_call_type afs_SRXCBInitCallBackState = {
+ .deliver = afs_deliver_cb_init_call_back_state,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_cm_destructor,
+};
/*
- * queue on the kafscmd queue for attention
+ * CB.Probe operation type
*/
-static void afscm_attention(struct rxrpc_call *call)
-{
- _enter("%p{cid=%u u=%d}",
- call, ntohl(call->call_id), atomic_read(&call->usage));
-
- spin_lock(&kafscmd_attention_lock);
-
- if (list_empty(&call->app_attn_link)) {
- list_add_tail(&call->app_attn_link, &kafscmd_attention_list);
- rxrpc_get_call(call);
- }
-
- spin_unlock(&kafscmd_attention_lock);
-
- wake_up(&kafscmd_sleepq);
-
- _leave(" {u=%d}", atomic_read(&call->usage));
-}
+static const struct afs_call_type afs_SRXCBProbe = {
+ .deliver = afs_deliver_cb_probe,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_cm_destructor,
+};
/*
- * handle my call being aborted
- * - clean up, dequeue and put my ref to the call
+ * route an incoming cache manager call
+ * - return T if supported, F if not
*/
-static void afscm_error(struct rxrpc_call *call)
+bool afs_cm_incoming_call(struct afs_call *call)
{
- int removed;
-
- _enter("%p{est=%s ac=%u er=%d}",
- call,
- rxrpc_call_error_states[call->app_err_state],
- call->app_abort_code,
- call->app_errno);
-
- spin_lock(&kafscmd_attention_lock);
-
- if (list_empty(&call->app_attn_link)) {
- list_add_tail(&call->app_attn_link, &kafscmd_attention_list);
- rxrpc_get_call(call);
- }
-
- spin_unlock(&kafscmd_attention_lock);
-
- removed = 0;
- spin_lock(&afscm_calls_lock);
- if (!list_empty(&call->app_link)) {
- list_del_init(&call->app_link);
- removed = 1;
+ u32 operation_id = ntohl(call->operation_ID);
+
+ _enter("{CB.OP %u}", operation_id);
+
+ switch (operation_id) {
+ case CBCallBack:
+ call->type = &afs_SRXCBCallBack;
+ return true;
+ case CBInitCallBackState:
+ call->type = &afs_SRXCBInitCallBackState;
+ return true;
+ case CBProbe:
+ call->type = &afs_SRXCBProbe;
+ return true;
+ default:
+ return false;
}
- spin_unlock(&afscm_calls_lock);
-
- if (removed)
- rxrpc_put_call(call);
-
- wake_up(&kafscmd_sleepq);
-
- _leave("");
}
/*
- * map afs abort codes to/from Linux error codes
- * - called with call->lock held
+ * clean up a cache manager call
*/
-static void afscm_aemap(struct rxrpc_call *call)
+static void afs_cm_destructor(struct afs_call *call)
{
- switch (call->app_err_state) {
- case RXRPC_ESTATE_LOCAL_ABORT:
- call->app_abort_code = -call->app_errno;
- break;
- case RXRPC_ESTATE_PEER_ABORT:
- call->app_errno = -ECONNABORTED;
- break;
- default:
- break;
- }
+ _enter("");
+
+ afs_put_server(call->server);
+ call->server = NULL;
+ kfree(call->buffer);
+ call->buffer = NULL;
}
/*
- * start the cache manager service if not already started
+ * allow the fileserver to see if the cache manager is still alive
*/
-int afscm_start(void)
+static void SRXAFSCB_CallBack(struct work_struct *work)
{
- int ret;
-
- down_write(&afscm_sem);
- if (!afscm_usage) {
- ret = kernel_thread(kafscmd, NULL, 0);
- if (ret < 0)
- goto out;
-
- wait_for_completion(&kafscmd_alive);
-
- ret = rxrpc_add_service(afs_transport, &AFSCM_service);
- if (ret < 0)
- goto kill;
+ struct afs_call *call = container_of(work, struct afs_call, work);
- afs_kafstimod_add_timer(&afs_mntpt_expiry_timer,
- afs_mntpt_expiry_timeout * HZ);
- }
-
- afscm_usage++;
- up_write(&afscm_sem);
-
- return 0;
+ _enter("");
-kill:
- kafscmd_die = 1;
- wake_up(&kafscmd_sleepq);
- wait_for_completion(&kafscmd_dead);
+ /* be sure to send the reply *before* attempting to spam the AFS server
+ * with FSFetchStatus requests on the vnodes with broken callbacks lest
+ * the AFS server get into a vicious cycle of trying to break further
+ * callbacks because it hadn't received completion of the CBCallBack op
+ * yet */
+ afs_send_empty_reply(call);
-out:
- up_write(&afscm_sem);
- return ret;
+ afs_break_callbacks(call->server, call->count, call->request);
+ _leave("");
}
/*
- * stop the cache manager service
+ * deliver request data to a CB.CallBack call
*/
-void afscm_stop(void)
+static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
+ bool last)
{
- struct rxrpc_call *call;
-
- down_write(&afscm_sem);
-
- BUG_ON(afscm_usage == 0);
- afscm_usage--;
-
- if (afscm_usage == 0) {
- /* don't want more incoming calls */
- rxrpc_del_service(afs_transport, &AFSCM_service);
-
- /* abort any calls I've still got open (the afscm_error() will
- * dequeue them) */
- spin_lock(&afscm_calls_lock);
- while (!list_empty(&afscm_calls)) {
- call = list_entry(afscm_calls.next,
- struct rxrpc_call,
- app_link);
-
- list_del_init(&call->app_link);
- rxrpc_get_call(call);
- spin_unlock(&afscm_calls_lock);
-
- rxrpc_call_abort(call, -ESRCH); /* abort, dequeue and
- * put */
-
- _debug("nuking active call %08x.%d",
- ntohl(call->conn->conn_id),
- ntohl(call->call_id));
- rxrpc_put_call(call);
- rxrpc_put_call(call);
-
- spin_lock(&afscm_calls_lock);
+ struct afs_callback *cb;
+ struct afs_server *server;
+ struct in_addr addr;
+ __be32 *bp;
+ u32 tmp;
+ int ret, loop;
+
+ _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
+
+ switch (call->unmarshall) {
+ case 0:
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* extract the FID array and its count in two steps */
+ case 1:
+ _debug("extract FID count");
+ ret = afs_extract_data(call, skb, last, &call->tmp, 4);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
}
- spin_unlock(&afscm_calls_lock);
-
- /* get rid of my daemon */
- kafscmd_die = 1;
- wake_up(&kafscmd_sleepq);
- wait_for_completion(&kafscmd_dead);
-
- /* dispose of any calls waiting for attention */
- spin_lock(&kafscmd_attention_lock);
- while (!list_empty(&kafscmd_attention_list)) {
- call = list_entry(kafscmd_attention_list.next,
- struct rxrpc_call,
- app_attn_link);
-
- list_del_init(&call->app_attn_link);
- spin_unlock(&kafscmd_attention_lock);
- rxrpc_put_call(call);
-
- spin_lock(&kafscmd_attention_lock);
+ call->count = ntohl(call->tmp);
+ _debug("FID count: %u", call->count);
+ if (call->count > AFSCBMAX)
+ return -EBADMSG;
+
+ call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
+ if (!call->buffer)
+ return -ENOMEM;
+ call->offset = 0;
+ call->unmarshall++;
+
+ case 2:
+ _debug("extract FID array");
+ ret = afs_extract_data(call, skb, last, call->buffer,
+ call->count * 3 * 4);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
}
- spin_unlock(&kafscmd_attention_lock);
-
- afs_kafstimod_del_timer(&afs_mntpt_expiry_timer);
- }
-
- up_write(&afscm_sem);
-}
-/*
- * handle the fileserver breaking a set of callbacks
- */
-static void _SRXAFSCM_CallBack(struct rxrpc_call *call)
-{
- struct afs_server *server;
- size_t count, qty, tmp;
- int ret = 0, removed;
-
- _enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
-
- server = afs_server_get_from_peer(call->conn->peer);
-
- switch (call->app_call_state) {
- /* we've received the last packet
- * - drain all the data from the call and send the reply
- */
- case RXRPC_CSTATE_SRVR_GOT_ARGS:
- ret = -EBADMSG;
- qty = call->app_ready_qty;
- if (qty < 8 || qty > 50 * (6 * 4) + 8)
- break;
-
- {
- struct afs_callback *cb, *pcb;
- int loop;
- __be32 *fp, *bp;
-
- fp = rxrpc_call_alloc_scratch(call, qty);
-
- /* drag the entire argument block out to the scratch
- * space */
- ret = rxrpc_call_read_data(call, fp, qty, 0);
- if (ret < 0)
- break;
-
- /* and unmarshall the parameter block */
- ret = -EBADMSG;
- count = ntohl(*fp++);
- if (count>AFSCBMAX ||
- (count * (3 * 4) + 8 != qty &&
- count * (6 * 4) + 8 != qty))
- break;
-
- bp = fp + count*3;
- tmp = ntohl(*bp++);
- if (tmp > 0 && tmp != count)
- break;
- if (tmp == 0)
- bp = NULL;
-
- pcb = cb = rxrpc_call_alloc_scratch_s(
- call, struct afs_callback);
-
- for (loop = count - 1; loop >= 0; loop--) {
- pcb->fid.vid = ntohl(*fp++);
- pcb->fid.vnode = ntohl(*fp++);
- pcb->fid.unique = ntohl(*fp++);
- if (bp) {
- pcb->version = ntohl(*bp++);
- pcb->expiry = ntohl(*bp++);
- pcb->type = ntohl(*bp++);
- } else {
- pcb->version = 0;
- pcb->expiry = 0;
- pcb->type = AFSCM_CB_UNTYPED;
- }
- pcb++;
- }
-
- /* invoke the actual service routine */
- ret = SRXAFSCM_CallBack(server, count, cb);
- if (ret < 0)
- break;
+ _debug("unmarshall FID array");
+ call->request = kcalloc(call->count,
+ sizeof(struct afs_callback),
+ GFP_KERNEL);
+ if (!call->request)
+ return -ENOMEM;
+
+ cb = call->request;
+ bp = call->buffer;
+ for (loop = call->count; loop > 0; loop--, cb++) {
+ cb->fid.vid = ntohl(*bp++);
+ cb->fid.vnode = ntohl(*bp++);
+ cb->fid.unique = ntohl(*bp++);
+ cb->type = AFSCM_CB_UNTYPED;
}
- /* send the reply */
- ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
- GFP_KERNEL, 0, &count);
- if (ret < 0)
- break;
- break;
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* extract the callback array and its count in two steps */
+ case 3:
+ _debug("extract CB count");
+ ret = afs_extract_data(call, skb, last, &call->tmp, 4);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
+ }
- /* operation complete */
- case RXRPC_CSTATE_COMPLETE:
- call->app_user = NULL;
- removed = 0;
- spin_lock(&afscm_calls_lock);
- if (!list_empty(&call->app_link)) {
- list_del_init(&call->app_link);
- removed = 1;
+ tmp = ntohl(call->tmp);
+ _debug("CB count: %u", tmp);
+ if (tmp != call->count && tmp != 0)
+ return -EBADMSG;
+ call->offset = 0;
+ call->unmarshall++;
+ if (tmp == 0)
+ goto empty_cb_array;
+
+ case 4:
+ _debug("extract CB array");
+ ret = afs_extract_data(call, skb, last, call->request,
+ call->count * 3 * 4);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
}
- spin_unlock(&afscm_calls_lock);
- if (removed)
- rxrpc_put_call(call);
- break;
+ _debug("unmarshall CB array");
+ cb = call->request;
+ bp = call->buffer;
+ for (loop = call->count; loop > 0; loop--, cb++) {
+ cb->version = ntohl(*bp++);
+ cb->expiry = ntohl(*bp++);
+ cb->type = ntohl(*bp++);
+ }
- /* operation terminated on error */
- case RXRPC_CSTATE_ERROR:
- call->app_user = NULL;
- break;
+ empty_cb_array:
+ call->offset = 0;
+ call->unmarshall++;
- default:
+ case 5:
+ _debug("trailer");
+ if (skb->len != 0)
+ return -EBADMSG;
break;
}
- if (ret < 0)
- rxrpc_call_abort(call, ret);
+ if (!last)
+ return 0;
- afs_put_server(server);
+ call->state = AFS_CALL_REPLYING;
- _leave(" = %d", ret);
+ /* we'll need the file server record as that tells us which set of
+ * vnodes to operate upon */
+ memcpy(&addr, &ip_hdr(skb)->saddr, 4);
+ server = afs_find_server(&addr);
+ if (!server)
+ return -ENOTCONN;
+ call->server = server;
+
+ INIT_WORK(&call->work, SRXAFSCB_CallBack);
+ schedule_work(&call->work);
+ return 0;
}
/*
- * handle the fileserver asking us to initialise our callback state
+ * allow the fileserver to request callback state (re-)initialisation
*/
-static void _SRXAFSCM_InitCallBackState(struct rxrpc_call *call)
+static void SRXAFSCB_InitCallBackState(struct work_struct *work)
{
- struct afs_server *server;
- size_t count;
- int ret = 0, removed;
-
- _enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
-
- server = afs_server_get_from_peer(call->conn->peer);
-
- switch (call->app_call_state) {
- /* we've received the last packet - drain all the data from the
- * call */
- case RXRPC_CSTATE_SRVR_GOT_ARGS:
- /* shouldn't be any args */
- ret = -EBADMSG;
- break;
+ struct afs_call *call = container_of(work, struct afs_call, work);
- /* send the reply when asked for it */
- case RXRPC_CSTATE_SRVR_SND_REPLY:
- /* invoke the actual service routine */
- ret = SRXAFSCM_InitCallBackState(server);
- if (ret < 0)
- break;
-
- ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
- GFP_KERNEL, 0, &count);
- if (ret < 0)
- break;
- break;
+ _enter("{%p}", call->server);
- /* operation complete */
- case RXRPC_CSTATE_COMPLETE:
- call->app_user = NULL;
- removed = 0;
- spin_lock(&afscm_calls_lock);
- if (!list_empty(&call->app_link)) {
- list_del_init(&call->app_link);
- removed = 1;
- }
- spin_unlock(&afscm_calls_lock);
-
- if (removed)
- rxrpc_put_call(call);
- break;
-
- /* operation terminated on error */
- case RXRPC_CSTATE_ERROR:
- call->app_user = NULL;
- break;
-
- default:
- break;
- }
-
- if (ret < 0)
- rxrpc_call_abort(call, ret);
-
- afs_put_server(server);
-
- _leave(" = %d", ret);
+ afs_init_callback_state(call->server);
+ afs_send_empty_reply(call);
+ _leave("");
}
/*
- * handle a probe from a fileserver
+ * deliver request data to a CB.InitCallBackState call
*/
-static void _SRXAFSCM_Probe(struct rxrpc_call *call)
+static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
+ struct sk_buff *skb,
+ bool last)
{
struct afs_server *server;
- size_t count;
- int ret = 0, removed;
+ struct in_addr addr;
- _enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
+ _enter(",{%u},%d", skb->len, last);
- server = afs_server_get_from_peer(call->conn->peer);
+ if (skb->len > 0)
+ return -EBADMSG;
+ if (!last)
+ return 0;
- switch (call->app_call_state) {
- /* we've received the last packet - drain all the data from the
- * call */
- case RXRPC_CSTATE_SRVR_GOT_ARGS:
- /* shouldn't be any args */
- ret = -EBADMSG;
- break;
+ /* no unmarshalling required */
+ call->state = AFS_CALL_REPLYING;
- /* send the reply when asked for it */
- case RXRPC_CSTATE_SRVR_SND_REPLY:
- /* invoke the actual service routine */
- ret = SRXAFSCM_Probe(server);
- if (ret < 0)
- break;
-
- ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
- GFP_KERNEL, 0, &count);
- if (ret < 0)
- break;
- break;
+ /* we'll need the file server record as that tells us which set of
+ * vnodes to operate upon */
+ memcpy(&addr, &ip_hdr(skb)->saddr, 4);
+ server = afs_find_server(&addr);
+ if (!server)
+ return -ENOTCONN;
+ call->server = server;
- /* operation complete */
- case RXRPC_CSTATE_COMPLETE:
- call->app_user = NULL;
- removed = 0;
- spin_lock(&afscm_calls_lock);
- if (!list_empty(&call->app_link)) {
- list_del_init(&call->app_link);
- removed = 1;
- }
- spin_unlock(&afscm_calls_lock);
+ INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
+ schedule_work(&call->work);
+ return 0;
+}
- if (removed)
- rxrpc_put_call(call);
- break;
+/*
+ * allow the fileserver to see if the cache manager is still alive
+ */
+static void SRXAFSCB_Probe(struct work_struct *work)
+{
+ struct afs_call *call = container_of(work, struct afs_call, work);
- /* operation terminated on error */
- case RXRPC_CSTATE_ERROR:
- call->app_user = NULL;
- break;
+ _enter("");
+ afs_send_empty_reply(call);
+ _leave("");
+}
- default:
- break;
- }
+/*
+ * deliver request data to a CB.Probe call
+ */
+static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
+ bool last)
+{
+ _enter(",{%u},%d", skb->len, last);
- if (ret < 0)
- rxrpc_call_abort(call, ret);
+ if (skb->len > 0)
+ return -EBADMSG;
+ if (!last)
+ return 0;
- afs_put_server(server);
+ /* no unmarshalling required */
+ call->state = AFS_CALL_REPLYING;
- _leave(" = %d", ret);
+ INIT_WORK(&call->work, SRXAFSCB_Probe);
+ schedule_work(&call->work);
+ return 0;
}
+++ /dev/null
-/* AFS Cache Manager Service declarations
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_CMSERVICE_H
-#define AFS_CMSERVICE_H
-
-#include <rxrpc/transport.h>
-#include "types.h"
-
-/* cache manager start/stop */
-extern int afscm_start(void);
-extern void afscm_stop(void);
-
-/* cache manager server functions */
-extern int SRXAFSCM_InitCallBackState(struct afs_server *);
-extern int SRXAFSCM_CallBack(struct afs_server *, size_t,
- struct afs_callback[]);
-extern int SRXAFSCM_Probe(struct afs_server *);
-
-#endif /* AFS_CMSERVICE_H */
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
-#include "vnode.h"
-#include "volume.h"
-#include <rxrpc/call.h>
-#include "super.h"
#include "internal.h"
static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
if (qty == 0)
goto error;
- if (page->index==0 && qty!=ntohs(dbuf->blocks[0].pagehdr.npages)) {
+ if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
- __FUNCTION__,dir->i_ino,qty,ntohs(dbuf->blocks[0].pagehdr.npages));
+ __FUNCTION__, dir->i_ino, qty,
+ ntohs(dbuf->blocks[0].pagehdr.npages));
goto error;
}
#endif
fail:
afs_dir_put_page(page);
+ _leave(" = -EIO");
return ERR_PTR(-EIO);
}
BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
- if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED)
+ if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
return -ENOENT;
_leave(" = 0");
/* skip entries marked unused in the bitmap */
if (!(block->pagehdr.bitmap[offset / 8] &
(1 << (offset % 8)))) {
- _debug("ENT[%Zu.%u]: unused\n",
+ _debug("ENT[%Zu.%u]: unused",
blkoff / sizeof(union afs_dir_block), offset);
if (offset >= curr)
*fpos = blkoff +
sizeof(*block) -
offset * sizeof(union afs_dirent));
- _debug("ENT[%Zu.%u]: %s %Zu \"%s\"\n",
+ _debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
blkoff / sizeof(union afs_dir_block), offset,
(offset < curr ? "skip" : "fill"),
nlen, dire->u.name);
if (next >= AFS_DIRENT_PER_BLOCK) {
_debug("ENT[%Zu.%u]:"
" %u travelled beyond end dir block"
- " (len %u/%Zu)\n",
+ " (len %u/%Zu)",
blkoff / sizeof(union afs_dir_block),
offset, next, tmp, nlen);
return -EIO;
if (!(block->pagehdr.bitmap[next / 8] &
(1 << (next % 8)))) {
_debug("ENT[%Zu.%u]:"
- " %u unmarked extension (len %u/%Zu)\n",
+ " %u unmarked extension (len %u/%Zu)",
blkoff / sizeof(union afs_dir_block),
offset, next, tmp, nlen);
return -EIO;
}
- _debug("ENT[%Zu.%u]: ext %u/%Zu\n",
+ _debug("ENT[%Zu.%u]: ext %u/%Zu",
blkoff / sizeof(union afs_dir_block),
next, tmp, nlen);
next++;
}
/*
- * read an AFS directory
+ * iterate through the data blob that lists the contents of an AFS directory
*/
static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie,
filldir_t filldir)
{
- union afs_dir_block *dblock;
+ union afs_dir_block *dblock;
struct afs_dir_page *dbuf;
struct page *page;
unsigned blkoff, limit;
_enter("{%lu},%u,,", dir->i_ino, *fpos);
- if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
+ if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
_leave(" = -ESTALE");
return -ESTALE;
}
unsigned fpos;
int ret;
- _enter("{%Ld,{%lu}}", file->f_pos, file->f_path.dentry->d_inode->i_ino);
+ _enter("{%Ld,{%lu}}",
+ file->f_pos, file->f_path.dentry->d_inode->i_ino);
fpos = file->f_pos;
- ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, cookie, filldir);
+ ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos,
+ cookie, filldir);
file->f_pos = fpos;
_leave(" = %d", ret);
{
struct afs_dir_lookup_cookie *cookie = _cookie;
- _enter("{%s,%Zu},%s,%u,,%lu,%u",
+ _enter("{%s,%Zu},%s,%u,,%llu,%u",
cookie->name, cookie->nlen, name, nlen, ino, dtype);
+ /* insanity checks first */
+ BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
+ BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
+
if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) {
_leave(" = 0 [no]");
return 0;
}
/*
- * look up an entry in a directory
+ * do a lookup in a directory
*/
-static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
+static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
+ struct afs_fid *fid)
{
struct afs_dir_lookup_cookie cookie;
struct afs_super_info *as;
- struct afs_vnode *vnode;
- struct inode *inode;
unsigned fpos;
int ret;
- _enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name);
-
- /* insanity checks first */
- BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
- BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
-
- if (dentry->d_name.len > 255) {
- _leave(" = -ENAMETOOLONG");
- return ERR_PTR(-ENAMETOOLONG);
- }
-
- vnode = AFS_FS_I(dir);
- if (vnode->flags & AFS_VNODE_DELETED) {
- _leave(" = -ESTALE");
- return ERR_PTR(-ESTALE);
- }
+ _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
as = dir->i_sb->s_fs_info;
fpos = 0;
ret = afs_dir_iterate(dir, &fpos, &cookie, afs_dir_lookup_filldir);
if (ret < 0) {
- _leave(" = %d", ret);
- return ERR_PTR(ret);
+ _leave(" = %d [iter]", ret);
+ return ret;
}
ret = -ENOENT;
if (!cookie.found) {
- _leave(" = %d", ret);
- return ERR_PTR(ret);
+ _leave(" = -ENOENT [not found]");
+ return -ENOENT;
}
- /* instantiate the dentry */
- ret = afs_iget(dir->i_sb, &cookie.fid, &inode);
+ *fid = cookie.fid;
+ _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
+ return 0;
+}
+
+/*
+ * look up an entry in a directory
+ */
+static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct afs_vnode *vnode;
+ struct afs_fid fid;
+ struct inode *inode;
+ int ret;
+
+ _enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name);
+
+ if (dentry->d_name.len > 255) {
+ _leave(" = -ENAMETOOLONG");
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+
+ vnode = AFS_FS_I(dir);
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _leave(" = -ESTALE");
+ return ERR_PTR(-ESTALE);
+ }
+
+ ret = afs_do_lookup(dir, dentry, &fid);
if (ret < 0) {
- _leave(" = %d", ret);
+ _leave(" = %d [do]", ret);
return ERR_PTR(ret);
}
+ /* instantiate the dentry */
+ inode = afs_iget(dir->i_sb, &fid);
+ if (IS_ERR(inode)) {
+ _leave(" = %ld", PTR_ERR(inode));
+ return ERR_PTR(PTR_ERR(inode));
+ }
+
dentry->d_op = &afs_fs_dentry_operations;
- dentry->d_fsdata = (void *) (unsigned long) vnode->status.version;
d_add(dentry, inode);
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }",
- cookie.fid.vnode,
- cookie.fid.unique,
+ fid.vnode,
+ fid.unique,
dentry->d_inode->i_ino,
dentry->d_inode->i_version);
}
/*
+ * propagate changed and modified flags on a directory to all the children of
+ * that directory as they may indicate that the ACL on the dir has changed,
+ * potentially rendering the child inaccessible or that a file has been deleted
+ * or renamed
+ */
+static void afs_propagate_dir_changes(struct dentry *dir)
+{
+ struct dentry *child;
+ bool c, m;
+
+ c = test_bit(AFS_VNODE_CHANGED, &AFS_FS_I(dir->d_inode)->flags);
+ m = test_bit(AFS_VNODE_MODIFIED, &AFS_FS_I(dir->d_inode)->flags);
+
+ _enter("{%d,%d}", c, m);
+
+ spin_lock(&dir->d_lock);
+
+ list_for_each_entry(child, &dir->d_subdirs, d_u.d_child) {
+ if (child->d_inode) {
+ struct afs_vnode *vnode;
+
+ _debug("tag %s", child->d_name.name);
+ vnode = AFS_FS_I(child->d_inode);
+ if (c)
+ set_bit(AFS_VNODE_DIR_CHANGED, &vnode->flags);
+ if (m)
+ set_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags);
+ }
+ }
+
+ spin_unlock(&dir->d_lock);
+}
+
+/*
* check that a dentry lookup hit has found a valid entry
* - NOTE! the hit can be a negative hit too, so we can't assume we have an
* inode
- * (derived from nfs_lookup_revalidate)
+ * - there are several things we need to check
+ * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
+ * symlink)
+ * - parent dir metadata changed (security changes)
+ * - dentry data changed (write, truncate)
+ * - dentry metadata changed (security changes)
*/
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
- struct afs_dir_lookup_cookie cookie;
+ struct afs_vnode *vnode;
+ struct afs_fid fid;
struct dentry *parent;
struct inode *inode, *dir;
- unsigned fpos;
int ret;
- _enter("{sb=%p n=%s},", dentry->d_sb, dentry->d_name.name);
+ vnode = AFS_FS_I(dentry->d_inode);
+
+ _enter("{sb=%p n=%s fl=%lx},",
+ dentry->d_sb, dentry->d_name.name, vnode->flags);
/* lock down the parent dentry so we can peer at it */
- parent = dget_parent(dentry->d_parent);
+ parent = dget_parent(dentry);
dir = parent->d_inode;
inode = dentry->d_inode;
/* handle a bad inode */
if (is_bad_inode(inode)) {
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
- /* force a full look up if the parent directory changed since last the
- * server was consulted
- * - otherwise this inode must still exist, even if the inode details
- * themselves have changed
- */
- if (AFS_FS_I(dir)->flags & AFS_VNODE_CHANGED)
- afs_vnode_fetch_status(AFS_FS_I(dir));
-
- if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
+ /* check that this dirent still exists if the directory's contents were
+ * modified */
+ if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
_debug("%s: parent dir deleted", dentry->d_name.name);
goto out_bad;
}
- if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED) {
- _debug("%s: file already deleted", dentry->d_name.name);
- goto out_bad;
- }
-
- if ((unsigned long) dentry->d_fsdata !=
- (unsigned long) AFS_FS_I(dir)->status.version) {
- _debug("%s: parent changed %lu -> %u",
- dentry->d_name.name,
- (unsigned long) dentry->d_fsdata,
- (unsigned) AFS_FS_I(dir)->status.version);
+ if (test_and_clear_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags)) {
+ /* rm/rmdir/rename may have occurred */
+ _debug("dir modified");
/* search the directory for this vnode */
- cookie.name = dentry->d_name.name;
- cookie.nlen = dentry->d_name.len;
- cookie.fid.vid = AFS_FS_I(inode)->volume->vid;
- cookie.found = 0;
-
- fpos = 0;
- ret = afs_dir_iterate(dir, &fpos, &cookie,
- afs_dir_lookup_filldir);
+ ret = afs_do_lookup(dir, dentry, &fid);
+ if (ret == -ENOENT) {
+ _debug("%s: dirent not found", dentry->d_name.name);
+ goto not_found;
+ }
if (ret < 0) {
_debug("failed to iterate dir %s: %d",
parent->d_name.name, ret);
goto out_bad;
}
- if (!cookie.found) {
- _debug("%s: dirent not found", dentry->d_name.name);
- goto not_found;
- }
-
/* if the vnode ID has changed, then the dirent points to a
* different file */
- if (cookie.fid.vnode != AFS_FS_I(inode)->fid.vnode) {
- _debug("%s: dirent changed", dentry->d_name.name);
+ if (fid.vnode != vnode->fid.vnode) {
+ _debug("%s: dirent changed [%u != %u]",
+ dentry->d_name.name, fid.vnode,
+ vnode->fid.vnode);
goto not_found;
}
/* if the vnode ID uniqifier has changed, then the file has
* been deleted */
- if (cookie.fid.unique != AFS_FS_I(inode)->fid.unique) {
+ if (fid.unique != vnode->fid.unique) {
_debug("%s: file deleted (uq %u -> %u I:%lu)",
- dentry->d_name.name,
- cookie.fid.unique,
- AFS_FS_I(inode)->fid.unique,
- inode->i_version);
- spin_lock(&AFS_FS_I(inode)->lock);
- AFS_FS_I(inode)->flags |= AFS_VNODE_DELETED;
- spin_unlock(&AFS_FS_I(inode)->lock);
+ dentry->d_name.name, fid.unique,
+ vnode->fid.unique, inode->i_version);
+ spin_lock(&vnode->lock);
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ spin_unlock(&vnode->lock);
invalidate_remote_inode(inode);
goto out_bad;
}
+ }
+
+ /* if the directory's metadata were changed then the security may be
+ * different and we may no longer have access */
+ mutex_lock(&vnode->cb_broken_lock);
- dentry->d_fsdata =
- (void *) (unsigned long) AFS_FS_I(dir)->status.version;
+ if (test_and_clear_bit(AFS_VNODE_DIR_CHANGED, &vnode->flags) ||
+ test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
+ _debug("%s: changed", dentry->d_name.name);
+ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ if (afs_vnode_fetch_status(vnode) < 0) {
+ mutex_unlock(&vnode->cb_broken_lock);
+ goto out_bad;
+ }
}
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _debug("%s: file already deleted", dentry->d_name.name);
+ mutex_unlock(&vnode->cb_broken_lock);
+ goto out_bad;
+ }
+
+ /* if the vnode's data version number changed then its contents are
+ * different */
+ if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
+ _debug("zap data");
+ invalidate_remote_inode(inode);
+ }
+
+ if (S_ISDIR(inode->i_mode) &&
+ (test_bit(AFS_VNODE_CHANGED, &vnode->flags) ||
+ test_bit(AFS_VNODE_MODIFIED, &vnode->flags)))
+ afs_propagate_dir_changes(dentry);
+
+ clear_bit(AFS_VNODE_CHANGED, &vnode->flags);
+ clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
+ mutex_unlock(&vnode->cb_broken_lock);
+
out_valid:
dput(parent);
_leave(" = 1 [valid]");
goto out_valid;
}
- shrink_dcache_parent(dentry);
-
_debug("dropping dentry %s/%s",
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ parent->d_name.name, dentry->d_name.name);
+ shrink_dcache_parent(dentry);
d_drop(dentry);
-
dput(parent);
_leave(" = 0 [bad]");
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto zap;
- if (dentry->d_inode) {
- if (AFS_FS_I(dentry->d_inode)->flags & AFS_VNODE_DELETED)
+ if (dentry->d_inode &&
+ test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags))
goto zap;
- }
_leave(" = 0 [keep]");
return 0;
-/* file.c: AFS filesystem file handling
+/* AFS filesystem file handling
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include "volume.h"
-#include "vnode.h"
-#include <rxrpc/call.h>
#include "internal.h"
#if 0
*/
static int afs_file_readpage(struct file *file, struct page *page)
{
- struct afs_rxfs_fetch_descriptor desc;
-#ifdef AFS_CACHING_SUPPORT
- struct cachefs_page *pageio;
-#endif
struct afs_vnode *vnode;
struct inode *inode;
+ size_t len;
+ off_t offset;
int ret;
inode = page->mapping->host;
BUG_ON(!PageLocked(page));
ret = -ESTALE;
- if (vnode->flags & AFS_VNODE_DELETED)
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
goto error;
#ifdef AFS_CACHING_SUPPORT
- ret = cachefs_page_get_private(page, &pageio, GFP_NOIO);
- if (ret < 0)
- goto error;
-
/* is it cached? */
ret = cachefs_read_or_alloc_page(vnode->cache,
page,
case -ENOBUFS:
case -ENODATA:
default:
- desc.fid = vnode->fid;
- desc.offset = page->index << PAGE_CACHE_SHIFT;
- desc.size = min((size_t) (inode->i_size - desc.offset),
- (size_t) PAGE_SIZE);
- desc.buffer = kmap(page);
-
- clear_page(desc.buffer);
+ offset = page->index << PAGE_CACHE_SHIFT;
+ len = min_t(size_t, i_size_read(inode) - offset, PAGE_SIZE);
/* read the contents of the file from the server into the
* page */
- ret = afs_vnode_fetch_data(vnode, &desc);
- kunmap(page);
+ ret = afs_vnode_fetch_data(vnode, offset, len, page);
if (ret < 0) {
- if (ret==-ENOENT) {
+ if (ret == -ENOENT) {
_debug("got NOENT from server"
" - marking file deleted and stale");
- vnode->flags |= AFS_VNODE_DELETED;
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
ret = -ESTALE;
}
-
#ifdef AFS_CACHING_SUPPORT
cachefs_uncache_page(vnode->cache, page);
#endif
_leave(" = 0");
return 0;
- error:
+error:
SetPageError(page);
unlock_page(page);
-
_leave(" = %d", ret);
return ret;
}
-/* fsclient.c: AFS File Server client stubs
+/* AFS File Server client stubs
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/init.h>
#include <linux/sched.h>
-#include <rxrpc/rxrpc.h>
-#include <rxrpc/transport.h>
-#include <rxrpc/connection.h>
-#include <rxrpc/call.h>
-#include "fsclient.h"
-#include "cmservice.h"
-#include "vnode.h"
-#include "server.h"
-#include "errors.h"
+#include <linux/circ_buf.h>
#include "internal.h"
-
-#define FSFETCHSTATUS 132 /* AFS Fetch file status */
-#define FSFETCHDATA 130 /* AFS Fetch file data */
-#define FSGIVEUPCALLBACKS 147 /* AFS Discard callback promises */
-#define FSGETVOLUMEINFO 148 /* AFS Get root volume information */
-#define FSGETROOTVOLUME 151 /* AFS Get root volume name */
-#define FSLOOKUP 161 /* AFS lookup file in directory */
+#include "afs_fs.h"
/*
- * map afs abort codes to/from Linux error codes
- * - called with call->lock held
+ * decode an AFSFetchStatus block
*/
-static void afs_rxfs_aemap(struct rxrpc_call *call)
+static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
+ struct afs_vnode *vnode)
{
- switch (call->app_err_state) {
- case RXRPC_ESTATE_LOCAL_ABORT:
- call->app_abort_code = -call->app_errno;
- break;
- case RXRPC_ESTATE_PEER_ABORT:
- call->app_errno = afs_abort_to_error(call->app_abort_code);
- break;
- default:
- break;
+ const __be32 *bp = *_bp;
+ umode_t mode;
+ u64 data_version;
+ u32 changed = 0; /* becomes non-zero if ctime-type changes seen */
+
+#define EXTRACT(DST) \
+ do { \
+ u32 x = ntohl(*bp++); \
+ changed |= DST - x; \
+ DST = x; \
+ } while (0)
+
+ vnode->status.if_version = ntohl(*bp++);
+ EXTRACT(vnode->status.type);
+ vnode->status.nlink = ntohl(*bp++);
+ EXTRACT(vnode->status.size);
+ data_version = ntohl(*bp++);
+ EXTRACT(vnode->status.author);
+ EXTRACT(vnode->status.owner);
+ EXTRACT(vnode->status.caller_access); /* call ticket dependent */
+ EXTRACT(vnode->status.anon_access);
+ EXTRACT(vnode->status.mode);
+ vnode->status.parent.vid = vnode->fid.vid;
+ EXTRACT(vnode->status.parent.vnode);
+ EXTRACT(vnode->status.parent.unique);
+ bp++; /* seg size */
+ vnode->status.mtime_client = ntohl(*bp++);
+ vnode->status.mtime_server = ntohl(*bp++);
+ bp++; /* group */
+ bp++; /* sync counter */
+ data_version |= (u64) ntohl(*bp++) << 32;
+ bp++; /* spare2 */
+ bp++; /* spare3 */
+ bp++; /* spare4 */
+ *_bp = bp;
+
+ if (changed) {
+ _debug("vnode changed");
+ set_bit(AFS_VNODE_CHANGED, &vnode->flags);
+ vnode->vfs_inode.i_uid = vnode->status.owner;
+ vnode->vfs_inode.i_size = vnode->status.size;
+ vnode->vfs_inode.i_version = vnode->fid.unique;
+
+ vnode->status.mode &= S_IALLUGO;
+ mode = vnode->vfs_inode.i_mode;
+ mode &= ~S_IALLUGO;
+ mode |= vnode->status.mode;
+ vnode->vfs_inode.i_mode = mode;
+ }
+
+ _debug("vnode time %lx, %lx",
+ vnode->status.mtime_client, vnode->status.mtime_server);
+ vnode->vfs_inode.i_ctime.tv_sec = vnode->status.mtime_server;
+ vnode->vfs_inode.i_mtime = vnode->vfs_inode.i_ctime;
+ vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime;
+
+ if (vnode->status.data_version != data_version) {
+ _debug("vnode modified %llx", data_version);
+ vnode->status.data_version = data_version;
+ set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
+ set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
}
}
/*
- * get the root volume name from a fileserver
- * - this operation doesn't seem to work correctly in OpenAFS server 1.2.2
+ * decode an AFSCallBack block
*/
-#if 0
-int afs_rxfs_get_root_volume(struct afs_server *server,
- char *buf, size_t *buflen)
+static void xdr_decode_AFSCallBack(const __be32 **_bp, struct afs_vnode *vnode)
{
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[2];
- size_t sent;
- int ret;
- u32 param[1];
-
- DECLARE_WAITQUEUE(myself, current);
-
- kenter("%p,%p,%u",server, buf, *buflen);
-
- /* get hold of the fileserver connection */
- ret = afs_server_get_fsconn(server, &conn);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(conn, NULL, NULL, afs_rxfs_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = FSGETROOTVOLUME;
-
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
-
- /* marshall the parameters */
- param[0] = htonl(FSGETROOTVOLUME);
-
- piov[0].iov_len = sizeof(param);
- piov[0].iov_base = param;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (call->app_call_state != RXRPC_CSTATE_CLNT_RCV_REPLY ||
- signal_pending(current))
- break;
- schedule();
- }
- set_current_state(TASK_RUNNING);
-
- ret = -EINTR;
- if (signal_pending(current))
- goto abort;
-
- switch (call->app_call_state) {
- case RXRPC_CSTATE_ERROR:
- ret = call->app_errno;
- kdebug("Got Error: %d", ret);
- goto out_unwait;
-
- case RXRPC_CSTATE_CLNT_GOT_REPLY:
- /* read the reply */
- kdebug("Got Reply: qty=%d", call->app_ready_qty);
-
- ret = -EBADMSG;
- if (call->app_ready_qty <= 4)
- goto abort;
-
- ret = rxrpc_call_read_data(call, NULL, call->app_ready_qty, 0);
- if (ret < 0)
- goto abort;
-
-#if 0
- /* unmarshall the reply */
- bp = buffer;
- for (loop = 0; loop < 65; loop++)
- entry->name[loop] = ntohl(*bp++);
- entry->name[64] = 0;
-
- entry->type = ntohl(*bp++);
- entry->num_servers = ntohl(*bp++);
-
- for (loop = 0; loop < 8; loop++)
- entry->servers[loop].addr.s_addr = *bp++;
-
- for (loop = 0; loop < 8; loop++)
- entry->servers[loop].partition = ntohl(*bp++);
-
- for (loop = 0; loop < 8; loop++)
- entry->servers[loop].flags = ntohl(*bp++);
-
- for (loop = 0; loop < 3; loop++)
- entry->volume_ids[loop] = ntohl(*bp++);
-
- entry->clone_id = ntohl(*bp++);
- entry->flags = ntohl(*bp);
-#endif
+ const __be32 *bp = *_bp;
- /* success */
- ret = 0;
- goto out_unwait;
-
- default:
- BUG();
- }
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- afs_server_release_fsconn(server, conn);
-out:
- kleave("");
- return ret;
+ vnode->cb_version = ntohl(*bp++);
+ vnode->cb_expiry = ntohl(*bp++);
+ vnode->cb_type = ntohl(*bp++);
+ vnode->cb_expires = vnode->cb_expiry + get_seconds();
+ *_bp = bp;
}
-#endif
/*
- * get information about a volume
+ * decode an AFSVolSync block
*/
-#if 0
-int afs_rxfs_get_volume_info(struct afs_server *server,
- const char *name,
- struct afs_volume_info *vinfo)
+static void xdr_decode_AFSVolSync(const __be32 **_bp,
+ struct afs_volsync *volsync)
{
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[3];
- size_t sent;
- int ret;
- u32 param[2], *bp, zero;
+ const __be32 *bp = *_bp;
- DECLARE_WAITQUEUE(myself, current);
+ volsync->creation = ntohl(*bp++);
+ bp++; /* spare2 */
+ bp++; /* spare3 */
+ bp++; /* spare4 */
+ bp++; /* spare5 */
+ bp++; /* spare6 */
+ *_bp = bp;
+}
- _enter("%p,%s,%p", server, name, vinfo);
+/*
+ * deliver reply data to an FS.FetchStatus
+ */
+static int afs_deliver_fs_fetch_status(struct afs_call *call,
+ struct sk_buff *skb, bool last)
+{
+ const __be32 *bp;
- /* get hold of the fileserver connection */
- ret = afs_server_get_fsconn(server, &conn);
- if (ret < 0)
- goto out;
+ _enter(",,%u", last);
- /* create a call through that connection */
- ret = rxrpc_create_call(conn, NULL, NULL, afs_rxfs_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = FSGETVOLUMEINFO;
+ afs_transfer_reply(call, skb);
+ if (!last)
+ return 0;
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
+ if (call->reply_size != call->reply_max)
+ return -EBADMSG;
- /* marshall the parameters */
- piov[1].iov_len = strlen(name);
- piov[1].iov_base = (char *) name;
-
- zero = 0;
- piov[2].iov_len = (4 - (piov[1].iov_len & 3)) & 3;
- piov[2].iov_base = &zero;
-
- param[0] = htonl(FSGETVOLUMEINFO);
- param[1] = htonl(piov[1].iov_len);
-
- piov[0].iov_len = sizeof(param);
- piov[0].iov_base = param;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 3, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- bp = rxrpc_call_alloc_scratch(call, 64);
-
- ret = rxrpc_call_read_data(call, bp, 64,
- RXRPC_CALL_READ_BLOCK |
- RXRPC_CALL_READ_ALL);
- if (ret < 0) {
- if (ret == -ECONNABORTED) {
- ret = call->app_errno;
- goto out_unwait;
- }
- goto abort;
- }
+ /* unmarshall the reply once we've received all of it */
+ bp = call->buffer;
+ xdr_decode_AFSFetchStatus(&bp, call->reply);
+ xdr_decode_AFSCallBack(&bp, call->reply);
+ if (call->reply2)
+ xdr_decode_AFSVolSync(&bp, call->reply2);
- /* unmarshall the reply */
- vinfo->vid = ntohl(*bp++);
- vinfo->type = ntohl(*bp++);
-
- vinfo->type_vids[0] = ntohl(*bp++);
- vinfo->type_vids[1] = ntohl(*bp++);
- vinfo->type_vids[2] = ntohl(*bp++);
- vinfo->type_vids[3] = ntohl(*bp++);
- vinfo->type_vids[4] = ntohl(*bp++);
-
- vinfo->nservers = ntohl(*bp++);
- vinfo->servers[0].addr.s_addr = *bp++;
- vinfo->servers[1].addr.s_addr = *bp++;
- vinfo->servers[2].addr.s_addr = *bp++;
- vinfo->servers[3].addr.s_addr = *bp++;
- vinfo->servers[4].addr.s_addr = *bp++;
- vinfo->servers[5].addr.s_addr = *bp++;
- vinfo->servers[6].addr.s_addr = *bp++;
- vinfo->servers[7].addr.s_addr = *bp++;
-
- ret = -EBADMSG;
- if (vinfo->nservers > 8)
- goto abort;
-
- /* success */
- ret = 0;
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- afs_server_release_fsconn(server, conn);
-out:
- _leave("");
- return ret;
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
+ _leave(" = 0 [done]");
+ return 0;
}
-#endif
+
+/*
+ * FS.FetchStatus operation type
+ */
+static const struct afs_call_type afs_RXFSFetchStatus = {
+ .deliver = afs_deliver_fs_fetch_status,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_flat_call_destructor,
+};
/*
* fetch the status information for a file
*/
-int afs_rxfs_fetch_file_status(struct afs_server *server,
- struct afs_vnode *vnode,
- struct afs_volsync *volsync)
+int afs_fs_fetch_file_status(struct afs_server *server,
+ struct afs_vnode *vnode,
+ struct afs_volsync *volsync,
+ const struct afs_wait_mode *wait_mode)
{
- struct afs_server_callslot callslot;
- struct rxrpc_call *call;
- struct kvec piov[1];
- size_t sent;
- int ret;
+ struct afs_call *call;
__be32 *bp;
- DECLARE_WAITQUEUE(myself, current);
+ _enter("");
- _enter("%p,{%u,%u,%u}",
- server, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
+ call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, 120);
+ if (!call)
+ return -ENOMEM;
- /* get hold of the fileserver connection */
- ret = afs_server_request_callslot(server, &callslot);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(callslot.conn, NULL, NULL, afs_rxfs_aemap,
- &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = FSFETCHSTATUS;
-
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
+ call->reply = vnode;
+ call->reply2 = volsync;
+ call->service_id = FS_SERVICE;
+ call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
- bp = rxrpc_call_alloc_scratch(call, 16);
+ bp = call->request;
bp[0] = htonl(FSFETCHSTATUS);
bp[1] = htonl(vnode->fid.vid);
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
- piov[0].iov_len = 16;
- piov[0].iov_base = bp;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- bp = rxrpc_call_alloc_scratch(call, 120);
-
- ret = rxrpc_call_read_data(call, bp, 120,
- RXRPC_CALL_READ_BLOCK |
- RXRPC_CALL_READ_ALL);
- if (ret < 0) {
- if (ret == -ECONNABORTED) {
- ret = call->app_errno;
- goto out_unwait;
- }
- goto abort;
- }
-
- /* unmarshall the reply */
- vnode->status.if_version = ntohl(*bp++);
- vnode->status.type = ntohl(*bp++);
- vnode->status.nlink = ntohl(*bp++);
- vnode->status.size = ntohl(*bp++);
- vnode->status.version = ntohl(*bp++);
- vnode->status.author = ntohl(*bp++);
- vnode->status.owner = ntohl(*bp++);
- vnode->status.caller_access = ntohl(*bp++);
- vnode->status.anon_access = ntohl(*bp++);
- vnode->status.mode = ntohl(*bp++);
- vnode->status.parent.vid = vnode->fid.vid;
- vnode->status.parent.vnode = ntohl(*bp++);
- vnode->status.parent.unique = ntohl(*bp++);
- bp++; /* seg size */
- vnode->status.mtime_client = ntohl(*bp++);
- vnode->status.mtime_server = ntohl(*bp++);
- bp++; /* group */
- bp++; /* sync counter */
- vnode->status.version |= ((unsigned long long) ntohl(*bp++)) << 32;
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
-
- vnode->cb_version = ntohl(*bp++);
- vnode->cb_expiry = ntohl(*bp++);
- vnode->cb_type = ntohl(*bp++);
-
- if (volsync) {
- volsync->creation = ntohl(*bp++);
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
- bp++; /* spare5 */
- bp++; /* spare6 */
- }
-
- /* success */
- ret = 0;
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- afs_server_release_callslot(server, &callslot);
-out:
- _leave("");
- return ret;
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
+ return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
- * fetch the contents of a file or directory
+ * deliver reply data to an FS.FetchData
*/
-int afs_rxfs_fetch_file_data(struct afs_server *server,
- struct afs_vnode *vnode,
- struct afs_rxfs_fetch_descriptor *desc,
- struct afs_volsync *volsync)
+static int afs_deliver_fs_fetch_data(struct afs_call *call,
+ struct sk_buff *skb, bool last)
{
- struct afs_server_callslot callslot;
- struct rxrpc_call *call;
- struct kvec piov[1];
- size_t sent;
+ const __be32 *bp;
+ struct page *page;
+ void *buffer;
int ret;
- __be32 *bp;
- DECLARE_WAITQUEUE(myself, current);
-
- _enter("%p,{fid={%u,%u,%u},sz=%Zu,of=%lu}",
- server,
- desc->fid.vid,
- desc->fid.vnode,
- desc->fid.unique,
- desc->size,
- desc->offset);
-
- /* get hold of the fileserver connection */
- ret = afs_server_request_callslot(server, &callslot);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(callslot.conn, NULL, NULL, afs_rxfs_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = FSFETCHDATA;
+ _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
+
+ switch (call->unmarshall) {
+ case 0:
+ call->offset = 0;
+ call->unmarshall++;
+
+ /* extract the returned data length */
+ case 1:
+ _debug("extract data length");
+ ret = afs_extract_data(call, skb, last, &call->tmp, 4);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
+ }
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
+ call->count = ntohl(call->tmp);
+ _debug("DATA length: %u", call->count);
+ if (call->count > PAGE_SIZE)
+ return -EBADMSG;
+ call->offset = 0;
+ call->unmarshall++;
+
+ if (call->count < PAGE_SIZE) {
+ buffer = kmap_atomic(call->reply3, KM_USER0);
+ memset(buffer + PAGE_SIZE - call->count, 0,
+ call->count);
+ kunmap_atomic(buffer, KM_USER0);
+ }
- /* marshall the parameters */
- bp = rxrpc_call_alloc_scratch(call, 24);
- bp[0] = htonl(FSFETCHDATA);
- bp[1] = htonl(desc->fid.vid);
- bp[2] = htonl(desc->fid.vnode);
- bp[3] = htonl(desc->fid.unique);
- bp[4] = htonl(desc->offset);
- bp[5] = htonl(desc->size);
-
- piov[0].iov_len = 24;
- piov[0].iov_base = bp;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the data count to arrive */
- ret = rxrpc_call_read_data(call, bp, 4, RXRPC_CALL_READ_BLOCK);
- if (ret < 0)
- goto read_failed;
-
- desc->actual = ntohl(bp[0]);
- if (desc->actual != desc->size) {
- ret = -EBADMSG;
- goto abort;
- }
+ /* extract the returned data */
+ case 2:
+ _debug("extract data");
+ page = call->reply3;
+ buffer = kmap_atomic(page, KM_USER0);
+ ret = afs_extract_data(call, skb, last, buffer, call->count);
+ kunmap_atomic(buffer, KM_USER0);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
+ }
- /* call the app to read the actual data */
- rxrpc_call_reset_scratch(call);
-
- ret = rxrpc_call_read_data(call, desc->buffer, desc->actual,
- RXRPC_CALL_READ_BLOCK);
- if (ret < 0)
- goto read_failed;
-
- /* wait for the rest of the reply to completely arrive */
- rxrpc_call_reset_scratch(call);
- bp = rxrpc_call_alloc_scratch(call, 120);
-
- ret = rxrpc_call_read_data(call, bp, 120,
- RXRPC_CALL_READ_BLOCK |
- RXRPC_CALL_READ_ALL);
- if (ret < 0)
- goto read_failed;
-
- /* unmarshall the reply */
- vnode->status.if_version = ntohl(*bp++);
- vnode->status.type = ntohl(*bp++);
- vnode->status.nlink = ntohl(*bp++);
- vnode->status.size = ntohl(*bp++);
- vnode->status.version = ntohl(*bp++);
- vnode->status.author = ntohl(*bp++);
- vnode->status.owner = ntohl(*bp++);
- vnode->status.caller_access = ntohl(*bp++);
- vnode->status.anon_access = ntohl(*bp++);
- vnode->status.mode = ntohl(*bp++);
- vnode->status.parent.vid = desc->fid.vid;
- vnode->status.parent.vnode = ntohl(*bp++);
- vnode->status.parent.unique = ntohl(*bp++);
- bp++; /* seg size */
- vnode->status.mtime_client = ntohl(*bp++);
- vnode->status.mtime_server = ntohl(*bp++);
- bp++; /* group */
- bp++; /* sync counter */
- vnode->status.version |= ((unsigned long long) ntohl(*bp++)) << 32;
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
+ call->offset = 0;
+ call->unmarshall++;
- vnode->cb_version = ntohl(*bp++);
- vnode->cb_expiry = ntohl(*bp++);
- vnode->cb_type = ntohl(*bp++);
-
- if (volsync) {
- volsync->creation = ntohl(*bp++);
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
- bp++; /* spare5 */
- bp++; /* spare6 */
- }
+ /* extract the metadata */
+ case 3:
+ ret = afs_extract_data(call, skb, last, call->buffer, 120);
+ switch (ret) {
+ case 0: break;
+ case -EAGAIN: return 0;
+ default: return ret;
+ }
+
+ bp = call->buffer;
+ xdr_decode_AFSFetchStatus(&bp, call->reply);
+ xdr_decode_AFSCallBack(&bp, call->reply);
+ if (call->reply2)
+ xdr_decode_AFSVolSync(&bp, call->reply2);
+
+ call->offset = 0;
+ call->unmarshall++;
- /* success */
- ret = 0;
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq,&myself);
- rxrpc_put_call(call);
-out_put_conn:
- afs_server_release_callslot(server, &callslot);
-out:
- _leave(" = %d", ret);
- return ret;
-
-read_failed:
- if (ret == -ECONNABORTED) {
- ret = call->app_errno;
- goto out_unwait;
+ case 4:
+ _debug("trailer");
+ if (skb->len != 0)
+ return -EBADMSG;
+ break;
}
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
+ if (!last)
+ return 0;
+
+ _leave(" = 0 [done]");
+ return 0;
}
/*
- * ask the AFS fileserver to discard a callback request on a file
+ * FS.FetchData operation type
*/
-int afs_rxfs_give_up_callback(struct afs_server *server,
- struct afs_vnode *vnode)
+static const struct afs_call_type afs_RXFSFetchData = {
+ .deliver = afs_deliver_fs_fetch_data,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_flat_call_destructor,
+};
+
+/*
+ * fetch data from a file
+ */
+int afs_fs_fetch_data(struct afs_server *server,
+ struct afs_vnode *vnode,
+ off_t offset, size_t length,
+ struct page *buffer,
+ struct afs_volsync *volsync,
+ const struct afs_wait_mode *wait_mode)
{
- struct afs_server_callslot callslot;
- struct rxrpc_call *call;
- struct kvec piov[1];
- size_t sent;
- int ret;
+ struct afs_call *call;
__be32 *bp;
- DECLARE_WAITQUEUE(myself, current);
+ _enter("");
- _enter("%p,{%u,%u,%u}",
- server, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
+ call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, 120);
+ if (!call)
+ return -ENOMEM;
- /* get hold of the fileserver connection */
- ret = afs_server_request_callslot(server, &callslot);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(callslot.conn, NULL, NULL, afs_rxfs_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = FSGIVEUPCALLBACKS;
-
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
+ call->reply = vnode;
+ call->reply2 = volsync;
+ call->reply3 = buffer;
+ call->service_id = FS_SERVICE;
+ call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
- bp = rxrpc_call_alloc_scratch(call, (1 + 4 + 4) * 4);
-
- piov[0].iov_len = (1 + 4 + 4) * 4;
- piov[0].iov_base = bp;
-
- *bp++ = htonl(FSGIVEUPCALLBACKS);
- *bp++ = htonl(1);
- *bp++ = htonl(vnode->fid.vid);
- *bp++ = htonl(vnode->fid.vnode);
- *bp++ = htonl(vnode->fid.unique);
- *bp++ = htonl(1);
- *bp++ = htonl(vnode->cb_version);
- *bp++ = htonl(vnode->cb_expiry);
- *bp++ = htonl(vnode->cb_type);
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (call->app_call_state != RXRPC_CSTATE_CLNT_RCV_REPLY ||
- signal_pending(current))
- break;
- schedule();
- }
- set_current_state(TASK_RUNNING);
-
- ret = -EINTR;
- if (signal_pending(current))
- goto abort;
-
- switch (call->app_call_state) {
- case RXRPC_CSTATE_ERROR:
- ret = call->app_errno;
- goto out_unwait;
+ bp = call->request;
+ bp[0] = htonl(FSFETCHDATA);
+ bp[1] = htonl(vnode->fid.vid);
+ bp[2] = htonl(vnode->fid.vnode);
+ bp[3] = htonl(vnode->fid.unique);
+ bp[4] = htonl(offset);
+ bp[5] = htonl(length);
- case RXRPC_CSTATE_CLNT_GOT_REPLY:
- ret = 0;
- goto out_unwait;
+ return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
+}
- default:
- BUG();
- }
+/*
+ * deliver reply data to an FS.GiveUpCallBacks
+ */
+static int afs_deliver_fs_give_up_callbacks(struct afs_call *call,
+ struct sk_buff *skb, bool last)
+{
+ _enter(",{%u},%d", skb->len, last);
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- afs_server_release_callslot(server, &callslot);
-out:
- _leave("");
- return ret;
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
+ if (skb->len > 0)
+ return -EBADMSG; /* shouldn't be any reply data */
+ return 0;
}
/*
- * look a filename up in a directory
- * - this operation doesn't seem to work correctly in OpenAFS server 1.2.2
+ * FS.GiveUpCallBacks operation type
+ */
+static const struct afs_call_type afs_RXFSGiveUpCallBacks = {
+ .deliver = afs_deliver_fs_give_up_callbacks,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_flat_call_destructor,
+};
+
+/*
+ * give up a set of callbacks
+ * - the callbacks are held in the server->cb_break ring
*/
-#if 0
-int afs_rxfs_lookup(struct afs_server *server,
- struct afs_vnode *dir,
- const char *filename,
- struct afs_vnode *vnode,
- struct afs_volsync *volsync)
+int afs_fs_give_up_callbacks(struct afs_server *server,
+ const struct afs_wait_mode *wait_mode)
{
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[3];
- size_t sent;
- int ret;
- u32 *bp, zero;
+ struct afs_call *call;
+ size_t ncallbacks;
+ __be32 *bp, *tp;
+ int loop;
- DECLARE_WAITQUEUE(myself, current);
+ ncallbacks = CIRC_CNT(server->cb_break_head, server->cb_break_tail,
+ ARRAY_SIZE(server->cb_break));
- kenter("%p,{%u,%u,%u},%s",
- server, fid->vid, fid->vnode, fid->unique, filename);
+ _enter("{%zu},", ncallbacks);
- /* get hold of the fileserver connection */
- ret = afs_server_get_fsconn(server, &conn);
- if (ret < 0)
- goto out;
+ if (ncallbacks == 0)
+ return 0;
+ if (ncallbacks > AFSCBMAX)
+ ncallbacks = AFSCBMAX;
- /* create a call through that connection */
- ret = rxrpc_create_call(conn, NULL, NULL, afs_rxfs_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = FSLOOKUP;
+ _debug("break %zu callbacks", ncallbacks);
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq,&myself);
+ call = afs_alloc_flat_call(&afs_RXFSGiveUpCallBacks,
+ 12 + ncallbacks * 6 * 4, 0);
+ if (!call)
+ return -ENOMEM;
+
+ call->service_id = FS_SERVICE;
+ call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
- bp = rxrpc_call_alloc_scratch(call, 20);
-
- zero = 0;
-
- piov[0].iov_len = 20;
- piov[0].iov_base = bp;
- piov[1].iov_len = strlen(filename);
- piov[1].iov_base = (char *) filename;
- piov[2].iov_len = (4 - (piov[1].iov_len & 3)) & 3;
- piov[2].iov_base = &zero;
-
- *bp++ = htonl(FSLOOKUP);
- *bp++ = htonl(dirfid->vid);
- *bp++ = htonl(dirfid->vnode);
- *bp++ = htonl(dirfid->unique);
- *bp++ = htonl(piov[1].iov_len);
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 3, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- bp = rxrpc_call_alloc_scratch(call, 220);
-
- ret = rxrpc_call_read_data(call, bp, 220,
- RXRPC_CALL_READ_BLOCK |
- RXRPC_CALL_READ_ALL);
- if (ret < 0) {
- if (ret == -ECONNABORTED) {
- ret = call->app_errno;
- goto out_unwait;
- }
- goto abort;
+ bp = call->request;
+ tp = bp + 2 + ncallbacks * 3;
+ *bp++ = htonl(FSGIVEUPCALLBACKS);
+ *bp++ = htonl(ncallbacks);
+ *tp++ = htonl(ncallbacks);
+
+ atomic_sub(ncallbacks, &server->cb_break_n);
+ for (loop = ncallbacks; loop > 0; loop--) {
+ struct afs_callback *cb =
+ &server->cb_break[server->cb_break_tail];
+
+ *bp++ = htonl(cb->fid.vid);
+ *bp++ = htonl(cb->fid.vnode);
+ *bp++ = htonl(cb->fid.unique);
+ *tp++ = htonl(cb->version);
+ *tp++ = htonl(cb->expiry);
+ *tp++ = htonl(cb->type);
+ smp_mb();
+ server->cb_break_tail =
+ (server->cb_break_tail + 1) &
+ (ARRAY_SIZE(server->cb_break) - 1);
}
- /* unmarshall the reply */
- fid->vid = ntohl(*bp++);
- fid->vnode = ntohl(*bp++);
- fid->unique = ntohl(*bp++);
-
- vnode->status.if_version = ntohl(*bp++);
- vnode->status.type = ntohl(*bp++);
- vnode->status.nlink = ntohl(*bp++);
- vnode->status.size = ntohl(*bp++);
- vnode->status.version = ntohl(*bp++);
- vnode->status.author = ntohl(*bp++);
- vnode->status.owner = ntohl(*bp++);
- vnode->status.caller_access = ntohl(*bp++);
- vnode->status.anon_access = ntohl(*bp++);
- vnode->status.mode = ntohl(*bp++);
- vnode->status.parent.vid = dirfid->vid;
- vnode->status.parent.vnode = ntohl(*bp++);
- vnode->status.parent.unique = ntohl(*bp++);
- bp++; /* seg size */
- vnode->status.mtime_client = ntohl(*bp++);
- vnode->status.mtime_server = ntohl(*bp++);
- bp++; /* group */
- bp++; /* sync counter */
- vnode->status.version |= ((unsigned long long) ntohl(*bp++)) << 32;
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
-
- dir->status.if_version = ntohl(*bp++);
- dir->status.type = ntohl(*bp++);
- dir->status.nlink = ntohl(*bp++);
- dir->status.size = ntohl(*bp++);
- dir->status.version = ntohl(*bp++);
- dir->status.author = ntohl(*bp++);
- dir->status.owner = ntohl(*bp++);
- dir->status.caller_access = ntohl(*bp++);
- dir->status.anon_access = ntohl(*bp++);
- dir->status.mode = ntohl(*bp++);
- dir->status.parent.vid = dirfid->vid;
- dir->status.parent.vnode = ntohl(*bp++);
- dir->status.parent.unique = ntohl(*bp++);
- bp++; /* seg size */
- dir->status.mtime_client = ntohl(*bp++);
- dir->status.mtime_server = ntohl(*bp++);
- bp++; /* group */
- bp++; /* sync counter */
- dir->status.version |= ((unsigned long long) ntohl(*bp++)) << 32;
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
-
- callback->fid = *fid;
- callback->version = ntohl(*bp++);
- callback->expiry = ntohl(*bp++);
- callback->type = ntohl(*bp++);
-
- if (volsync) {
- volsync->creation = ntohl(*bp++);
- bp++; /* spare2 */
- bp++; /* spare3 */
- bp++; /* spare4 */
- bp++; /* spare5 */
- bp++; /* spare6 */
- }
+ ASSERT(ncallbacks > 0);
+ wake_up_nr(&server->cb_break_waitq, ncallbacks);
- /* success */
- ret = 0;
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- afs_server_release_fsconn(server, conn);
-out:
- kleave("");
- return ret;
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
+ return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
-#endif
+++ /dev/null
-/* AFS File Server client stub declarations
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_FSCLIENT_H
-#define AFS_FSCLIENT_H
-
-#include "server.h"
-
-extern int afs_rxfs_get_volume_info(struct afs_server *,
- const char *,
- struct afs_volume_info *);
-
-extern int afs_rxfs_fetch_file_status(struct afs_server *,
- struct afs_vnode *,
- struct afs_volsync *);
-
-struct afs_rxfs_fetch_descriptor {
- struct afs_fid fid; /* file ID to fetch */
- size_t size; /* total number of bytes to fetch */
- off_t offset; /* offset in file to start from */
- void *buffer; /* read buffer */
- size_t actual; /* actual size sent back by server */
-};
-
-extern int afs_rxfs_fetch_file_data(struct afs_server *,
- struct afs_vnode *,
- struct afs_rxfs_fetch_descriptor *,
- struct afs_volsync *);
-
-extern int afs_rxfs_give_up_callback(struct afs_server *,
- struct afs_vnode *);
-
-/* this doesn't appear to work in OpenAFS server */
-extern int afs_rxfs_lookup(struct afs_server *,
- struct afs_vnode *,
- const char *,
- struct afs_vnode *,
- struct afs_volsync *);
-
-/* this is apparently mis-implemented in OpenAFS server */
-extern int afs_rxfs_get_root_volume(struct afs_server *,
- char *,
- size_t *);
-
-
-#endif /* AFS_FSCLIENT_H */
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include "volume.h"
-#include "vnode.h"
-#include "super.h"
#include "internal.h"
struct afs_iget_data {
vnode->status.type,
vnode->status.nlink,
vnode->status.size,
- vnode->status.version,
+ vnode->status.data_version,
vnode->status.mode);
switch (vnode->status.type) {
if (vnode->status.type == AFS_FTYPE_SYMLINK) {
afs_mntpt_check_symlink(vnode);
- if (vnode->flags & AFS_VNODE_MOUNTPOINT) {
+ if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
inode->i_mode = S_IFDIR | vnode->status.mode;
inode->i_op = &afs_mntpt_inode_operations;
inode->i_fop = &afs_mntpt_file_operations;
}
/*
- * attempt to fetch the status of an inode, coelescing multiple simultaneous
- * fetches
- */
-static int afs_inode_fetch_status(struct inode *inode)
-{
- struct afs_vnode *vnode;
- int ret;
-
- vnode = AFS_FS_I(inode);
-
- ret = afs_vnode_fetch_status(vnode);
-
- if (ret == 0)
- ret = afs_inode_map_status(vnode);
-
- return ret;
-}
-
-/*
* iget5() comparator
*/
static int afs_iget5_test(struct inode *inode, void *opaque)
/*
* inode retrieval
*/
-inline int afs_iget(struct super_block *sb, struct afs_fid *fid,
- struct inode **_inode)
+inline struct inode *afs_iget(struct super_block *sb, struct afs_fid *fid)
{
struct afs_iget_data data = { .fid = *fid };
struct afs_super_info *as;
&data);
if (!inode) {
_leave(" = -ENOMEM");
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
}
+ _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
+ inode, fid->vid, fid->vnode, fid->unique);
+
vnode = AFS_FS_I(inode);
/* deal with an existing inode */
if (!(inode->i_state & I_NEW)) {
- ret = afs_vnode_fetch_status(vnode);
- if (ret == 0)
- *_inode = inode;
- else
- iput(inode);
- _leave(" = %d", ret);
- return ret;
+ _leave(" = %p", inode);
+ return inode;
}
#ifdef AFS_CACHING_SUPPORT
#endif
/* okay... it's a new inode */
- inode->i_flags |= S_NOATIME;
- vnode->flags |= AFS_VNODE_CHANGED;
- ret = afs_inode_fetch_status(inode);
- if (ret<0)
+ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ ret = afs_vnode_fetch_status(vnode);
+ if (ret < 0)
+ goto bad_inode;
+ ret = afs_inode_map_status(vnode);
+ if (ret < 0)
goto bad_inode;
/* success */
+ inode->i_flags |= S_NOATIME;
unlock_new_inode(inode);
-
- *_inode = inode;
- _leave(" = 0 [CB { v=%u x=%lu t=%u }]",
- vnode->cb_version,
- vnode->cb_timeout.timo_jif,
- vnode->cb_type);
- return 0;
+ _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
+ return inode;
/* failure */
bad_inode:
iput(inode);
_leave(" = %d [bad]", ret);
- return ret;
+ return ERR_PTR(ret);
}
/*
int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
- struct afs_vnode *vnode;
struct inode *inode;
- int ret;
inode = dentry->d_inode;
_enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
- vnode = AFS_FS_I(inode);
-
- ret = afs_inode_fetch_status(inode);
- if (ret == -ENOENT) {
- _leave(" = %d [%d %p]",
- ret, atomic_read(&dentry->d_count), dentry->d_inode);
- return ret;
- } else if (ret < 0) {
- make_bad_inode(inode);
- _leave(" = %d", ret);
- return ret;
- }
-
- /* transfer attributes from the inode structure to the stat
- * structure */
generic_fillattr(inode, stat);
-
- _leave(" = 0 CB { v=%u x=%u t=%u }",
- vnode->cb_version,
- vnode->cb_expiry,
- vnode->cb_type);
-
return 0;
}
vnode->fid.vnode,
vnode->cb_version,
vnode->cb_expiry,
- vnode->cb_type
- );
+ vnode->cb_type);
- BUG_ON(inode->i_ino != vnode->fid.vnode);
+ _debug("CLEAR INODE %p", inode);
+
+ ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
+
+ afs_give_up_callback(vnode);
+
+ if (vnode->server) {
+ spin_lock(&vnode->server->fs_lock);
+ rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
+ spin_unlock(&vnode->server->fs_lock);
+ afs_put_server(vnode->server);
+ vnode->server = NULL;
+ }
- afs_vnode_give_up_callback(vnode);
+ ASSERT(!vnode->cb_promised);
#ifdef AFS_CACHING_SUPPORT
cachefs_relinquish_cookie(vnode->cache, 0);
/* internal AFS stuff
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* 2 of the License, or (at your option) any later version.
*/
-#ifndef AFS_INTERNAL_H
-#define AFS_INTERNAL_H
-
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
+#include <linux/skbuff.h>
+#include <linux/rxrpc.h>
+#include "afs.h"
+#include "afs_vl.h"
+
+#define AFS_CELL_MAX_ADDRS 15
+
+struct afs_call;
+
+typedef enum {
+ AFS_VL_NEW, /* new, uninitialised record */
+ AFS_VL_CREATING, /* creating record */
+ AFS_VL_VALID, /* record is pending */
+ AFS_VL_NO_VOLUME, /* no such volume available */
+ AFS_VL_UPDATING, /* update in progress */
+ AFS_VL_VOLUME_DELETED, /* volume was deleted */
+ AFS_VL_UNCERTAIN, /* uncertain state (update failed) */
+} __attribute__((packed)) afs_vlocation_state_t;
/*
- * debug tracing
+ * definition of how to wait for the completion of an operation
*/
-#define kenter(FMT, a...) printk("==> %s("FMT")\n",__FUNCTION__ , ## a)
-#define kleave(FMT, a...) printk("<== %s()"FMT"\n",__FUNCTION__ , ## a)
-#define kdebug(FMT, a...) printk(FMT"\n" , ## a)
-#define kproto(FMT, a...) printk("### "FMT"\n" , ## a)
-#define knet(FMT, a...) printk(FMT"\n" , ## a)
-
-#ifdef __KDEBUG
-#define _enter(FMT, a...) kenter(FMT , ## a)
-#define _leave(FMT, a...) kleave(FMT , ## a)
-#define _debug(FMT, a...) kdebug(FMT , ## a)
-#define _proto(FMT, a...) kproto(FMT , ## a)
-#define _net(FMT, a...) knet(FMT , ## a)
-#else
-#define _enter(FMT, a...) do { } while(0)
-#define _leave(FMT, a...) do { } while(0)
-#define _debug(FMT, a...) do { } while(0)
-#define _proto(FMT, a...) do { } while(0)
-#define _net(FMT, a...) do { } while(0)
-#endif
+struct afs_wait_mode {
+ /* RxRPC received message notification */
+ void (*rx_wakeup)(struct afs_call *call);
-static inline void afs_discard_my_signals(void)
-{
- while (signal_pending(current)) {
- siginfo_t sinfo;
+ /* synchronous call waiter and call dispatched notification */
+ int (*wait)(struct afs_call *call);
+
+ /* asynchronous call completion */
+ void (*async_complete)(void *reply, int error);
+};
+
+extern const struct afs_wait_mode afs_sync_call;
+extern const struct afs_wait_mode afs_async_call;
+
+/*
+ * a record of an in-progress RxRPC call
+ */
+struct afs_call {
+ const struct afs_call_type *type; /* type of call */
+ const struct afs_wait_mode *wait_mode; /* completion wait mode */
+ wait_queue_head_t waitq; /* processes awaiting completion */
+ struct work_struct async_work; /* asynchronous work processor */
+ struct work_struct work; /* actual work processor */
+ struct sk_buff_head rx_queue; /* received packets */
+ struct rxrpc_call *rxcall; /* RxRPC call handle */
+ struct key *key; /* security for this call */
+ struct afs_server *server; /* server affected by incoming CM call */
+ void *request; /* request data (first part) */
+ void *request2; /* request data (second part) */
+ void *buffer; /* reply receive buffer */
+ void *reply; /* reply buffer (first part) */
+ void *reply2; /* reply buffer (second part) */
+ void *reply3; /* reply buffer (third part) */
+ enum { /* call state */
+ AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
+ AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
+ AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */
+ AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
+ AFS_CALL_REPLYING, /* replying to incoming call */
+ AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */
+ AFS_CALL_COMPLETE, /* successfully completed */
+ AFS_CALL_BUSY, /* server was busy */
+ AFS_CALL_ABORTED, /* call was aborted */
+ AFS_CALL_ERROR, /* call failed due to error */
+ } state;
+ int error; /* error code */
+ unsigned request_size; /* size of request data */
+ unsigned reply_max; /* maximum size of reply */
+ unsigned reply_size; /* current size of reply */
+ unsigned short offset; /* offset into received data store */
+ unsigned char unmarshall; /* unmarshalling phase */
+ bool incoming; /* T if incoming call */
+ u16 service_id; /* RxRPC service ID to call */
+ __be16 port; /* target UDP port */
+ __be32 operation_ID; /* operation ID for an incoming call */
+ u32 count; /* count for use in unmarshalling */
+ __be32 tmp; /* place to extract temporary data */
+};
+
+struct afs_call_type {
+ /* deliver request or reply data to an call
+ * - returning an error will cause the call to be aborted
+ */
+ int (*deliver)(struct afs_call *call, struct sk_buff *skb,
+ bool last);
+
+ /* map an abort code to an error number */
+ int (*abort_to_error)(u32 abort_code);
+
+ /* clean up a call */
+ void (*destructor)(struct afs_call *call);
+};
+
+/*
+ * AFS superblock private data
+ * - there's one superblock per volume
+ */
+struct afs_super_info {
+ struct afs_volume *volume; /* volume record */
+ char rwparent; /* T if parent is R/W AFS volume */
+};
- spin_lock_irq(¤t->sighand->siglock);
- dequeue_signal(current,¤t->blocked, &sinfo);
- spin_unlock_irq(¤t->sighand->siglock);
- }
+static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
+{
+ return sb->s_fs_info;
}
+extern struct file_system_type afs_fs_type;
+
+/*
+ * entry in the cached cell catalogue
+ */
+struct afs_cache_cell {
+ char name[64]; /* cell name (padded with NULs) */
+ struct in_addr vl_servers[15]; /* cached cell VL servers */
+};
+
+/*
+ * AFS cell record
+ */
+struct afs_cell {
+ atomic_t usage;
+ struct list_head link; /* main cell list link */
+ struct list_head proc_link; /* /proc cell list link */
+ struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
+#ifdef AFS_CACHING_SUPPORT
+ struct cachefs_cookie *cache; /* caching cookie */
+#endif
+
+ /* server record management */
+ rwlock_t servers_lock; /* active server list lock */
+ struct list_head servers; /* active server list */
+
+ /* volume location record management */
+ struct rw_semaphore vl_sem; /* volume management serialisation semaphore */
+ struct list_head vl_list; /* cell's active VL record list */
+ spinlock_t vl_lock; /* vl_list lock */
+ unsigned short vl_naddrs; /* number of VL servers in addr list */
+ unsigned short vl_curr_svix; /* current server index */
+ struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */
+
+ char name[0]; /* cell name - must go last */
+};
+
+/*
+ * entry in the cached volume location catalogue
+ */
+struct afs_cache_vlocation {
+ uint8_t name[64 + 1]; /* volume name (lowercase, padded with NULs) */
+ uint8_t nservers; /* number of entries used in servers[] */
+ uint8_t vidmask; /* voltype mask for vid[] */
+ uint8_t srvtmask[8]; /* voltype masks for servers[] */
+#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
+#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
+#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
+
+ afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
+ struct in_addr servers[8]; /* fileserver addresses */
+ time_t rtime; /* last retrieval time */
+};
+
+/*
+ * volume -> vnode hash table entry
+ */
+struct afs_cache_vhash {
+ afs_voltype_t vtype; /* which volume variation */
+ uint8_t hash_bucket; /* which hash bucket this represents */
+} __attribute__((packed));
+
+/*
+ * AFS volume location record
+ */
+struct afs_vlocation {
+ atomic_t usage;
+ time_t time_of_death; /* time at which put reduced usage to 0 */
+ struct list_head link; /* link in cell volume location list */
+ struct list_head grave; /* link in master graveyard list */
+ struct list_head update; /* link in master update list */
+ struct afs_cell *cell; /* cell to which volume belongs */
+#ifdef AFS_CACHING_SUPPORT
+ struct cachefs_cookie *cache; /* caching cookie */
+#endif
+ struct afs_cache_vlocation vldb; /* volume information DB record */
+ struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
+ wait_queue_head_t waitq; /* status change waitqueue */
+ time_t update_at; /* time at which record should be updated */
+ rwlock_t lock; /* access lock */
+ afs_vlocation_state_t state; /* volume location state */
+ unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
+ unsigned short upd_busy_cnt; /* EBUSY count during update */
+ bool valid; /* T if valid */
+};
+
+/*
+ * AFS fileserver record
+ */
+struct afs_server {
+ atomic_t usage;
+ time_t time_of_death; /* time at which put reduced usage to 0 */
+ struct in_addr addr; /* server address */
+ struct afs_cell *cell; /* cell in which server resides */
+ struct list_head link; /* link in cell's server list */
+ struct list_head grave; /* link in master graveyard list */
+ struct rb_node master_rb; /* link in master by-addr tree */
+ struct rw_semaphore sem; /* access lock */
+
+ /* file service access */
+ struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */
+ unsigned long fs_act_jif; /* time at which last activity occurred */
+ unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
+ spinlock_t fs_lock; /* access lock */
+ int fs_state; /* 0 or reason FS currently marked dead (-errno) */
+
+ /* callback promise management */
+ struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */
+ struct delayed_work cb_updater; /* callback updater */
+ struct delayed_work cb_break_work; /* collected break dispatcher */
+ wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */
+ spinlock_t cb_lock; /* access lock */
+ struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */
+ atomic_t cb_break_n; /* number of pending breaks */
+ u8 cb_break_head; /* head of callback breaking ring */
+ u8 cb_break_tail; /* tail of callback breaking ring */
+};
+
+/*
+ * AFS volume access record
+ */
+struct afs_volume {
+ atomic_t usage;
+ struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
+ struct afs_vlocation *vlocation; /* volume location */
+#ifdef AFS_CACHING_SUPPORT
+ struct cachefs_cookie *cache; /* caching cookie */
+#endif
+ afs_volid_t vid; /* volume ID */
+ afs_voltype_t type; /* type of volume */
+ char type_force; /* force volume type (suppress R/O -> R/W) */
+ unsigned short nservers; /* number of server slots filled */
+ unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
+ struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
+ struct rw_semaphore server_sem; /* lock for accessing current server */
+};
+
+/*
+ * vnode catalogue entry
+ */
+struct afs_cache_vnode {
+ afs_vnodeid_t vnode_id; /* vnode ID */
+ unsigned vnode_unique; /* vnode ID uniquifier */
+ afs_dataversion_t data_version; /* data version */
+};
+
+/*
+ * AFS inode private data
+ */
+struct afs_vnode {
+ struct inode vfs_inode; /* the VFS's inode record */
+
+ struct afs_volume *volume; /* volume on which vnode resides */
+ struct afs_server *server; /* server currently supplying this file */
+ struct afs_fid fid; /* the file identifier for this inode */
+ struct afs_file_status status; /* AFS status info for this file */
+#ifdef AFS_CACHING_SUPPORT
+ struct cachefs_cookie *cache; /* caching cookie */
+#endif
+
+ wait_queue_head_t update_waitq; /* status fetch waitqueue */
+ unsigned update_cnt; /* number of outstanding ops that will update the
+ * status */
+ spinlock_t lock; /* waitqueue/flags lock */
+ unsigned long flags;
+#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
+#define AFS_VNODE_CHANGED 1 /* set if vnode's metadata changed */
+#define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */
+#define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
+#define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
+#define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
+#define AFS_VNODE_DIR_CHANGED 6 /* set if vnode's parent dir metadata changed */
+#define AFS_VNODE_DIR_MODIFIED 7 /* set if vnode's parent dir data modified */
+
+ /* outstanding callback notification on this file */
+ struct rb_node server_rb; /* link in server->fs_vnodes */
+ struct rb_node cb_promise; /* link in server->cb_promises */
+ struct work_struct cb_broken_work; /* work to be done on callback break */
+ struct mutex cb_broken_lock; /* lock against multiple attempts to fix break */
+// struct list_head cb_hash_link; /* link in master callback hash */
+ time_t cb_expires; /* time at which callback expires */
+ time_t cb_expires_at; /* time used to order cb_promise */
+ unsigned cb_version; /* callback version */
+ unsigned cb_expiry; /* callback expiry time */
+ afs_callback_type_t cb_type; /* type of callback */
+ bool cb_promised; /* true if promise still holds */
+};
+
+/*****************************************************************************/
+/*
+ * callback.c
+ */
+extern void afs_init_callback_state(struct afs_server *);
+extern void afs_broken_callback_work(struct work_struct *);
+extern void afs_break_callbacks(struct afs_server *, size_t,
+ struct afs_callback[]);
+extern void afs_give_up_callback(struct afs_vnode *);
+extern void afs_dispatch_give_up_callbacks(struct work_struct *);
+extern void afs_flush_callback_breaks(struct afs_server *);
+extern int __init afs_callback_update_init(void);
+extern void __exit afs_callback_update_kill(void);
+
/*
* cell.c
*/
extern struct cachefs_index_def afs_cache_cell_index_def;
#endif
+#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
+extern int afs_cell_init(char *);
+extern struct afs_cell *afs_cell_create(const char *, char *);
+extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
+extern struct afs_cell *afs_grab_cell(struct afs_cell *);
+extern void afs_put_cell(struct afs_cell *);
+extern void afs_cell_purge(void);
+
+/*
+ * cmservice.c
+ */
+extern bool afs_cm_incoming_call(struct afs_call *);
+
/*
* dir.c
*/
#endif
/*
+ * fsclient.c
+ */
+extern int afs_fs_fetch_file_status(struct afs_server *,
+ struct afs_vnode *,
+ struct afs_volsync *,
+ const struct afs_wait_mode *);
+extern int afs_fs_give_up_callbacks(struct afs_server *,
+ const struct afs_wait_mode *);
+extern int afs_fs_fetch_data(struct afs_server *, struct afs_vnode *, off_t,
+ size_t, struct page *, struct afs_volsync *,
+ const struct afs_wait_mode *);
+
+/*
* inode.c
*/
-extern int afs_iget(struct super_block *, struct afs_fid *, struct inode **);
+extern struct inode *afs_iget(struct super_block *, struct afs_fid *);
extern int afs_inode_getattr(struct vfsmount *, struct dentry *,
struct kstat *);
extern void afs_clear_inode(struct inode *);
#endif
/*
+ * misc.c
+ */
+extern int afs_abort_to_error(u32);
+
+/*
* mntpt.c
*/
extern const struct inode_operations afs_mntpt_inode_operations;
extern const struct file_operations afs_mntpt_file_operations;
-extern struct afs_timer afs_mntpt_expiry_timer;
-extern struct afs_timer_ops afs_mntpt_expiry_timer_ops;
extern unsigned long afs_mntpt_expiry_timeout;
extern int afs_mntpt_check_symlink(struct afs_vnode *);
+extern void afs_mntpt_kill_timer(void);
+extern void afs_umount_begin(struct vfsmount *, int);
/*
* super.c
extern int afs_fs_init(void);
extern void afs_fs_exit(void);
-#define AFS_CB_HASH_COUNT (PAGE_SIZE / sizeof(struct list_head))
-
-extern struct list_head afs_cb_hash_tbl[];
-extern spinlock_t afs_cb_hash_lock;
-
-#define afs_cb_hash(SRV, FID) \
- afs_cb_hash_tbl[((unsigned long)(SRV) + \
- (FID)->vid + (FID)->vnode + (FID)->unique) & \
- (AFS_CB_HASH_COUNT - 1)]
-
/*
* proc.c
*/
extern int afs_proc_cell_setup(struct afs_cell *);
extern void afs_proc_cell_remove(struct afs_cell *);
-#endif /* AFS_INTERNAL_H */
+/*
+ * rxrpc.c
+ */
+extern int afs_open_socket(void);
+extern void afs_close_socket(void);
+extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
+ const struct afs_wait_mode *);
+extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
+ size_t, size_t);
+extern void afs_flat_call_destructor(struct afs_call *);
+extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
+extern void afs_send_empty_reply(struct afs_call *);
+extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
+ size_t);
+
+/*
+ * server.c
+ */
+extern spinlock_t afs_server_peer_lock;
+
+#define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
+
+extern struct afs_server *afs_lookup_server(struct afs_cell *,
+ const struct in_addr *);
+extern struct afs_server *afs_find_server(const struct in_addr *);
+extern void afs_put_server(struct afs_server *);
+extern void __exit afs_purge_servers(void);
+
+/*
+ * vlclient.c
+ */
+#ifdef AFS_CACHING_SUPPORT
+extern struct cachefs_index_def afs_vlocation_cache_index_def;
+#endif
+
+extern int afs_vl_get_entry_by_name(struct in_addr *, const char *,
+ struct afs_cache_vlocation *,
+ const struct afs_wait_mode *);
+extern int afs_vl_get_entry_by_id(struct in_addr *, afs_volid_t, afs_voltype_t,
+ struct afs_cache_vlocation *,
+ const struct afs_wait_mode *);
+
+/*
+ * vlocation.c
+ */
+#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
+
+extern int __init afs_vlocation_update_init(void);
+extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
+ const char *, size_t);
+extern void afs_put_vlocation(struct afs_vlocation *);
+extern void __exit afs_vlocation_purge(void);
+
+/*
+ * vnode.c
+ */
+#ifdef AFS_CACHING_SUPPORT
+extern struct cachefs_index_def afs_vnode_cache_index_def;
+#endif
+
+extern struct afs_timer_ops afs_vnode_cb_timed_out_ops;
+
+static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
+{
+ return container_of(inode, struct afs_vnode, vfs_inode);
+}
+
+static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
+{
+ return &vnode->vfs_inode;
+}
+
+extern int afs_vnode_fetch_status(struct afs_vnode *);
+extern int afs_vnode_fetch_data(struct afs_vnode *vnode, off_t, size_t,
+ struct page *);
+
+/*
+ * volume.c
+ */
+#ifdef AFS_CACHING_SUPPORT
+extern struct cachefs_index_def afs_volume_cache_index_def;
+#endif
+
+#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
+
+extern void afs_put_volume(struct afs_volume *);
+extern struct afs_volume *afs_volume_lookup(const char *, struct afs_cell *,
+ int);
+extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
+extern int afs_volume_release_fileserver(struct afs_vnode *,
+ struct afs_server *, int);
+
+/*****************************************************************************/
+/*
+ * debug tracing
+ */
+extern unsigned afs_debug;
+
+#define dbgprintk(FMT,...) \
+ printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__)
+
+/* make sure we maintain the format strings, even when debugging is disabled */
+static inline __attribute__((format(printf,1,2)))
+void _dbprintk(const char *fmt, ...)
+{
+}
+
+#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
+#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
+#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
+
+
+#if defined(__KDEBUG)
+#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
+#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
+#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
+
+#elif defined(CONFIG_AFS_DEBUG)
+#define AFS_DEBUG_KENTER 0x01
+#define AFS_DEBUG_KLEAVE 0x02
+#define AFS_DEBUG_KDEBUG 0x04
+
+#define _enter(FMT,...) \
+do { \
+ if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
+ kenter(FMT,##__VA_ARGS__); \
+} while (0)
+
+#define _leave(FMT,...) \
+do { \
+ if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
+ kleave(FMT,##__VA_ARGS__); \
+} while (0)
+
+#define _debug(FMT,...) \
+do { \
+ if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
+ kdebug(FMT,##__VA_ARGS__); \
+} while (0)
+
+#else
+#define _enter(FMT,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
+#define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
+#define _debug(FMT,...) _dbprintk(" "FMT ,##__VA_ARGS__)
+#endif
+
+/*
+ * debug assertion checking
+ */
+#if 1 // defined(__KDEBUGALL)
+
+#define ASSERT(X) \
+do { \
+ if (unlikely(!(X))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "AFS: Assertion failed\n"); \
+ BUG(); \
+ } \
+} while(0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+ if (unlikely(!((X) OP (Y)))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "AFS: Assertion failed\n"); \
+ printk(KERN_ERR "%lu " #OP " %lu is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while(0)
+
+#define ASSERTIF(C, X) \
+do { \
+ if (unlikely((C) && !(X))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "AFS: Assertion failed\n"); \
+ BUG(); \
+ } \
+} while(0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+ if (unlikely((C) && !((X) OP (Y)))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "AFS: Assertion failed\n"); \
+ printk(KERN_ERR "%lu " #OP " %lu is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while(0)
+
+#else
+
+#define ASSERT(X) \
+do { \
+} while(0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+} while(0)
+
+#define ASSERTIF(C, X) \
+do { \
+} while(0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+} while(0)
+
+#endif /* __KDEBUGALL */
+++ /dev/null
-/* AFS asynchronous operation daemon
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- *
- * The AFS async daemon is used to the following:
- * - probe "dead" servers to see whether they've come back to life yet.
- * - probe "live" servers that we haven't talked to for a while to see if they are better
- * candidates for serving than what we're currently using
- * - poll volume location servers to keep up to date volume location lists
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/freezer.h>
-#include "cell.h"
-#include "server.h"
-#include "volume.h"
-#include "kafsasyncd.h"
-#include "kafstimod.h"
-#include <rxrpc/call.h>
-#include <asm/errno.h>
-#include "internal.h"
-
-static DECLARE_COMPLETION(kafsasyncd_alive);
-static DECLARE_COMPLETION(kafsasyncd_dead);
-static DECLARE_WAIT_QUEUE_HEAD(kafsasyncd_sleepq);
-static struct task_struct *kafsasyncd_task;
-static int kafsasyncd_die;
-
-static int kafsasyncd(void *arg);
-
-static LIST_HEAD(kafsasyncd_async_attnq);
-static LIST_HEAD(kafsasyncd_async_busyq);
-static DEFINE_SPINLOCK(kafsasyncd_async_lock);
-
-static void kafsasyncd_null_call_attn_func(struct rxrpc_call *call)
-{
-}
-
-static void kafsasyncd_null_call_error_func(struct rxrpc_call *call)
-{
-}
-
-/*
- * start the async daemon
- */
-int afs_kafsasyncd_start(void)
-{
- int ret;
-
- ret = kernel_thread(kafsasyncd, NULL, 0);
- if (ret < 0)
- return ret;
-
- wait_for_completion(&kafsasyncd_alive);
-
- return ret;
-}
-
-/*
- * stop the async daemon
- */
-void afs_kafsasyncd_stop(void)
-{
- /* get rid of my daemon */
- kafsasyncd_die = 1;
- wake_up(&kafsasyncd_sleepq);
- wait_for_completion(&kafsasyncd_dead);
-}
-
-/*
- * probing daemon
- */
-static int kafsasyncd(void *arg)
-{
- struct afs_async_op *op;
- int die;
-
- DECLARE_WAITQUEUE(myself, current);
-
- kafsasyncd_task = current;
-
- printk("kAFS: Started kafsasyncd %d\n", current->pid);
-
- daemonize("kafsasyncd");
-
- complete(&kafsasyncd_alive);
-
- /* loop around looking for things to attend to */
- do {
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&kafsasyncd_sleepq, &myself);
-
- for (;;) {
- if (!list_empty(&kafsasyncd_async_attnq) ||
- signal_pending(current) ||
- kafsasyncd_die)
- break;
-
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
- }
-
- remove_wait_queue(&kafsasyncd_sleepq, &myself);
- set_current_state(TASK_RUNNING);
-
- try_to_freeze();
-
- /* discard pending signals */
- afs_discard_my_signals();
-
- die = kafsasyncd_die;
-
- /* deal with the next asynchronous operation requiring
- * attention */
- if (!list_empty(&kafsasyncd_async_attnq)) {
- struct afs_async_op *op;
-
- _debug("@@@ Begin Asynchronous Operation");
-
- op = NULL;
- spin_lock(&kafsasyncd_async_lock);
-
- if (!list_empty(&kafsasyncd_async_attnq)) {
- op = list_entry(kafsasyncd_async_attnq.next,
- struct afs_async_op, link);
- list_move_tail(&op->link,
- &kafsasyncd_async_busyq);
- }
-
- spin_unlock(&kafsasyncd_async_lock);
-
- _debug("@@@ Operation %p {%p}\n",
- op, op ? op->ops : NULL);
-
- if (op)
- op->ops->attend(op);
-
- _debug("@@@ End Asynchronous Operation");
- }
-
- } while(!die);
-
- /* need to kill all outstanding asynchronous operations before
- * exiting */
- kafsasyncd_task = NULL;
- spin_lock(&kafsasyncd_async_lock);
-
- /* fold the busy and attention queues together */
- list_splice_init(&kafsasyncd_async_busyq,
- &kafsasyncd_async_attnq);
-
- /* dequeue kafsasyncd from all their wait queues */
- list_for_each_entry(op, &kafsasyncd_async_attnq, link) {
- op->call->app_attn_func = kafsasyncd_null_call_attn_func;
- op->call->app_error_func = kafsasyncd_null_call_error_func;
- remove_wait_queue(&op->call->waitq, &op->waiter);
- }
-
- spin_unlock(&kafsasyncd_async_lock);
-
- /* abort all the operations */
- while (!list_empty(&kafsasyncd_async_attnq)) {
- op = list_entry(kafsasyncd_async_attnq.next, struct afs_async_op, link);
- list_del_init(&op->link);
-
- rxrpc_call_abort(op->call, -EIO);
- rxrpc_put_call(op->call);
- op->call = NULL;
-
- op->ops->discard(op);
- }
-
- /* and that's all */
- _leave("");
- complete_and_exit(&kafsasyncd_dead, 0);
-}
-
-/*
- * begin an operation
- * - place operation on busy queue
- */
-void afs_kafsasyncd_begin_op(struct afs_async_op *op)
-{
- _enter("");
-
- spin_lock(&kafsasyncd_async_lock);
-
- init_waitqueue_entry(&op->waiter, kafsasyncd_task);
- add_wait_queue(&op->call->waitq, &op->waiter);
-
- list_move_tail(&op->link, &kafsasyncd_async_busyq);
-
- spin_unlock(&kafsasyncd_async_lock);
-
- _leave("");
-}
-
-/*
- * request attention for an operation
- * - move to attention queue
- */
-void afs_kafsasyncd_attend_op(struct afs_async_op *op)
-{
- _enter("");
-
- spin_lock(&kafsasyncd_async_lock);
-
- list_move_tail(&op->link, &kafsasyncd_async_attnq);
-
- spin_unlock(&kafsasyncd_async_lock);
-
- wake_up(&kafsasyncd_sleepq);
-
- _leave("");
-}
-
-/*
- * terminate an operation
- * - remove from either queue
- */
-void afs_kafsasyncd_terminate_op(struct afs_async_op *op)
-{
- _enter("");
-
- spin_lock(&kafsasyncd_async_lock);
-
- if (!list_empty(&op->link)) {
- list_del_init(&op->link);
- remove_wait_queue(&op->call->waitq, &op->waiter);
- }
-
- spin_unlock(&kafsasyncd_async_lock);
-
- wake_up(&kafsasyncd_sleepq);
-
- _leave("");
-}
+++ /dev/null
-/* AFS asynchronous operation daemon
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_KAFSASYNCD_H
-#define AFS_KAFSASYNCD_H
-
-#include "types.h"
-
-struct afs_async_op;
-
-struct afs_async_op_ops {
- void (*attend)(struct afs_async_op *);
- void (*discard)(struct afs_async_op *);
-};
-
-/*
- * asynchronous operation record
- */
-struct afs_async_op {
- struct list_head link;
- struct afs_server *server; /* server being contacted */
- struct rxrpc_call *call; /* RxRPC call performing op */
- wait_queue_t waiter; /* wait queue for kafsasyncd */
- const struct afs_async_op_ops *ops; /* operations */
-};
-
-static inline void afs_async_op_init(struct afs_async_op *op,
- const struct afs_async_op_ops *ops)
-{
- INIT_LIST_HEAD(&op->link);
- op->call = NULL;
- op->ops = ops;
-}
-
-extern int afs_kafsasyncd_start(void);
-extern void afs_kafsasyncd_stop(void);
-
-extern void afs_kafsasyncd_begin_op(struct afs_async_op *);
-extern void afs_kafsasyncd_attend_op(struct afs_async_op *);
-extern void afs_kafsasyncd_terminate_op(struct afs_async_op *);
-
-#endif /* AFS_KAFSASYNCD_H */
+++ /dev/null
-/* AFS timeout daemon
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/freezer.h>
-#include "cell.h"
-#include "volume.h"
-#include "kafstimod.h"
-#include <asm/errno.h>
-#include "internal.h"
-
-static DECLARE_COMPLETION(kafstimod_alive);
-static DECLARE_COMPLETION(kafstimod_dead);
-static DECLARE_WAIT_QUEUE_HEAD(kafstimod_sleepq);
-static int kafstimod_die;
-
-static LIST_HEAD(kafstimod_list);
-static DEFINE_SPINLOCK(kafstimod_lock);
-
-static int kafstimod(void *arg);
-
-/*
- * start the timeout daemon
- */
-int afs_kafstimod_start(void)
-{
- int ret;
-
- ret = kernel_thread(kafstimod, NULL, 0);
- if (ret < 0)
- return ret;
-
- wait_for_completion(&kafstimod_alive);
-
- return ret;
-}
-
-/*
- * stop the timeout daemon
- */
-void afs_kafstimod_stop(void)
-{
- /* get rid of my daemon */
- kafstimod_die = 1;
- wake_up(&kafstimod_sleepq);
- wait_for_completion(&kafstimod_dead);
-}
-
-/*
- * timeout processing daemon
- */
-static int kafstimod(void *arg)
-{
- struct afs_timer *timer;
-
- DECLARE_WAITQUEUE(myself, current);
-
- printk("kAFS: Started kafstimod %d\n", current->pid);
-
- daemonize("kafstimod");
-
- complete(&kafstimod_alive);
-
- /* loop around looking for things to attend to */
-loop:
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&kafstimod_sleepq, &myself);
-
- for (;;) {
- unsigned long jif;
- signed long timeout;
-
- /* deal with the server being asked to die */
- if (kafstimod_die) {
- remove_wait_queue(&kafstimod_sleepq, &myself);
- _leave("");
- complete_and_exit(&kafstimod_dead, 0);
- }
-
- try_to_freeze();
-
- /* discard pending signals */
- afs_discard_my_signals();
-
- /* work out the time to elapse before the next event */
- spin_lock(&kafstimod_lock);
- if (list_empty(&kafstimod_list)) {
- timeout = MAX_SCHEDULE_TIMEOUT;
- } else {
- timer = list_entry(kafstimod_list.next,
- struct afs_timer, link);
- timeout = timer->timo_jif;
- jif = jiffies;
-
- if (time_before_eq((unsigned long) timeout, jif))
- goto immediate;
- timeout = (long) timeout - (long) jiffies;
- }
- spin_unlock(&kafstimod_lock);
-
- schedule_timeout(timeout);
-
- set_current_state(TASK_INTERRUPTIBLE);
- }
-
- /* the thing on the front of the queue needs processing
- * - we come here with the lock held and timer pointing to the expired
- * entry
- */
-immediate:
- remove_wait_queue(&kafstimod_sleepq, &myself);
- set_current_state(TASK_RUNNING);
-
- _debug("@@@ Begin Timeout of %p", timer);
-
- /* dequeue the timer */
- list_del_init(&timer->link);
- spin_unlock(&kafstimod_lock);
-
- /* call the timeout function */
- timer->ops->timed_out(timer);
-
- _debug("@@@ End Timeout");
- goto loop;
-}
-
-/*
- * (re-)queue a timer
- */
-void afs_kafstimod_add_timer(struct afs_timer *timer, unsigned long timeout)
-{
- struct afs_timer *ptimer;
- struct list_head *_p;
-
- _enter("%p,%lu", timer, timeout);
-
- spin_lock(&kafstimod_lock);
-
- list_del(&timer->link);
-
- /* the timer was deferred or reset - put it back in the queue at the
- * right place */
- timer->timo_jif = jiffies + timeout;
-
- list_for_each(_p, &kafstimod_list) {
- ptimer = list_entry(_p, struct afs_timer, link);
- if (time_before(timer->timo_jif, ptimer->timo_jif))
- break;
- }
-
- list_add_tail(&timer->link, _p); /* insert before stopping point */
-
- spin_unlock(&kafstimod_lock);
-
- wake_up(&kafstimod_sleepq);
-
- _leave("");
-}
-
-/*
- * dequeue a timer
- * - returns 0 if the timer was deleted or -ENOENT if it wasn't queued
- */
-int afs_kafstimod_del_timer(struct afs_timer *timer)
-{
- int ret = 0;
-
- _enter("%p", timer);
-
- spin_lock(&kafstimod_lock);
-
- if (list_empty(&timer->link))
- ret = -ENOENT;
- else
- list_del_init(&timer->link);
-
- spin_unlock(&kafstimod_lock);
-
- wake_up(&kafstimod_sleepq);
-
- _leave(" = %d", ret);
- return ret;
-}
+++ /dev/null
-/* AFS timeout daemon
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_KAFSTIMOD_H
-#define AFS_KAFSTIMOD_H
-
-#include "types.h"
-
-struct afs_timer;
-
-struct afs_timer_ops {
- /* called when the front of the timer queue has timed out */
- void (*timed_out)(struct afs_timer *);
-};
-
-/*
- * AFS timer/timeout record
- */
-struct afs_timer {
- struct list_head link; /* link in timer queue */
- unsigned long timo_jif; /* timeout time */
- const struct afs_timer_ops *ops; /* timeout expiry function */
-};
-
-static inline void afs_timer_init(struct afs_timer *timer,
- const struct afs_timer_ops *ops)
-{
- INIT_LIST_HEAD(&timer->link);
- timer->ops = ops;
-}
-
-extern int afs_kafstimod_start(void);
-extern void afs_kafstimod_stop(void);
-extern void afs_kafstimod_add_timer(struct afs_timer *, unsigned long);
-extern int afs_kafstimod_del_timer(struct afs_timer *);
-
-#endif /* AFS_KAFSTIMOD_H */
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/completion.h>
-#include <rxrpc/rxrpc.h>
-#include <rxrpc/transport.h>
-#include <rxrpc/call.h>
-#include <rxrpc/peer.h>
-#include "cache.h"
-#include "cell.h"
-#include "server.h"
-#include "fsclient.h"
-#include "cmservice.h"
-#include "kafstimod.h"
-#include "kafsasyncd.h"
#include "internal.h"
-struct rxrpc_transport *afs_transport;
-
-static int afs_adding_peer(struct rxrpc_peer *peer);
-static void afs_discarding_peer(struct rxrpc_peer *peer);
-
-
MODULE_DESCRIPTION("AFS Client File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
+unsigned afs_debug;
+module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(afs_debug, "AFS debugging mask");
+
static char *rootcell;
module_param(rootcell, charp, 0);
MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
-
-static struct rxrpc_peer_ops afs_peer_ops = {
- .adding = afs_adding_peer,
- .discarding = afs_discarding_peer,
-};
-
-struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT];
-DEFINE_SPINLOCK(afs_cb_hash_lock);
-
#ifdef AFS_CACHING_SUPPORT
static struct cachefs_netfs_operations afs_cache_ops = {
.get_page_cookie = afs_cache_get_page_cookie,
*/
static int __init afs_init(void)
{
- int loop, ret;
+ int ret;
printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
- /* initialise the callback hash table */
- spin_lock_init(&afs_cb_hash_lock);
- for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--)
- INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]);
-
/* register the /proc stuff */
ret = afs_proc_init();
if (ret < 0)
if (ret < 0)
goto error_cell_init;
- /* start the timeout daemon */
- ret = afs_kafstimod_start();
+ /* initialise the VL update process */
+ ret = afs_vlocation_update_init();
if (ret < 0)
- goto error_kafstimod;
+ goto error_vl_update_init;
- /* start the async operation daemon */
- ret = afs_kafsasyncd_start();
- if (ret < 0)
- goto error_kafsasyncd;
+ /* initialise the callback update process */
+ ret = afs_callback_update_init();
/* create the RxRPC transport */
- ret = rxrpc_create_transport(7001, &afs_transport);
+ ret = afs_open_socket();
if (ret < 0)
- goto error_transport;
-
- afs_transport->peer_ops = &afs_peer_ops;
+ goto error_open_socket;
/* register the filesystems */
ret = afs_fs_init();
return ret;
error_fs:
- rxrpc_put_transport(afs_transport);
-error_transport:
- afs_kafsasyncd_stop();
-error_kafsasyncd:
- afs_kafstimod_stop();
-error_kafstimod:
+ afs_close_socket();
+error_open_socket:
+error_vl_update_init:
error_cell_init:
#ifdef AFS_CACHING_SUPPORT
cachefs_unregister_netfs(&afs_cache_netfs);
error_cache:
#endif
+ afs_callback_update_kill();
+ afs_vlocation_purge();
afs_cell_purge();
afs_proc_cleanup();
printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
afs_fs_exit();
- rxrpc_put_transport(afs_transport);
- afs_kafstimod_stop();
- afs_kafsasyncd_stop();
+ afs_close_socket();
+ afs_purge_servers();
+ afs_callback_update_kill();
+ afs_vlocation_purge();
+ flush_scheduled_work();
afs_cell_purge();
#ifdef AFS_CACHING_SUPPORT
cachefs_unregister_netfs(&afs_cache_netfs);
}
module_exit(afs_exit);
-
-/*
- * notification that new peer record is being added
- * - called from krxsecd
- * - return an error to induce an abort
- * - mustn't sleep (caller holds an rwlock)
- */
-static int afs_adding_peer(struct rxrpc_peer *peer)
-{
- struct afs_server *server;
- int ret;
-
- _debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr));
-
- /* determine which server the peer resides in (if any) */
- ret = afs_server_find_by_peer(peer, &server);
- if (ret < 0)
- return ret; /* none that we recognise, so abort */
-
- _debug("Server %p{u=%d}\n", server, atomic_read(&server->usage));
-
- _debug("Cell %p{u=%d}\n",
- server->cell, atomic_read(&server->cell->usage));
-
- /* cross-point the structs under a global lock */
- spin_lock(&afs_server_peer_lock);
- peer->user = server;
- server->peer = peer;
- spin_unlock(&afs_server_peer_lock);
-
- afs_put_server(server);
-
- return 0;
-}
-
-/*
- * notification that a peer record is being discarded
- * - called from krxiod or krxsecd
- */
-static void afs_discarding_peer(struct rxrpc_peer *peer)
-{
- struct afs_server *server;
-
- _enter("%p",peer);
-
- _debug("Discarding peer %08x (rtt=%lu.%lumS)\n",
- ntohl(peer->addr.s_addr),
- (long) (peer->rtt / 1000),
- (long) (peer->rtt % 1000));
-
- /* uncross-point the structs under a global lock */
- spin_lock(&afs_server_peer_lock);
- server = peer->user;
- if (server) {
- peer->user = NULL;
- server->peer = NULL;
- }
- spin_unlock(&afs_server_peer_lock);
-
- _leave("");
-}
/* miscellaneous bits
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
-#include "errors.h"
#include "internal.h"
+#include "afs_fs.h"
/*
* convert an AFS abort code to a Linux error number
*/
-int afs_abort_to_error(int abortcode)
+int afs_abort_to_error(u32 abort_code)
{
- switch (abortcode) {
+ switch (abort_code) {
+ case 13: return -EACCES;
case VSALVAGE: return -EIO;
case VNOVNODE: return -ENOENT;
- case VNOVOL: return -ENXIO;
+ case VNOVOL: return -ENOMEDIUM;
case VVOLEXISTS: return -EEXIST;
case VNOSERVICE: return -EIO;
case VOFFLINE: return -ENOENT;
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/mnt_namespace.h>
-#include "super.h"
-#include "cell.h"
-#include "volume.h"
-#include "vnode.h"
#include "internal.h"
struct nameidata *nd);
static int afs_mntpt_open(struct inode *inode, struct file *file);
static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd);
+static void afs_mntpt_expiry_timed_out(struct work_struct *work);
const struct file_operations afs_mntpt_file_operations = {
.open = afs_mntpt_open,
};
static LIST_HEAD(afs_vfsmounts);
+static DECLARE_DELAYED_WORK(afs_mntpt_expiry_timer, afs_mntpt_expiry_timed_out);
-static void afs_mntpt_expiry_timed_out(struct afs_timer *timer);
-
-struct afs_timer_ops afs_mntpt_expiry_timer_ops = {
- .timed_out = afs_mntpt_expiry_timed_out,
-};
-
-struct afs_timer afs_mntpt_expiry_timer;
-
-unsigned long afs_mntpt_expiry_timeout = 20;
+unsigned long afs_mntpt_expiry_timeout = 10 * 60;
/*
* check a symbolic link to see whether it actually encodes a mountpoint
/* examine the symlink's contents */
size = vnode->status.size;
- _debug("symlink to %*.*s", size, (int) size, buf);
+ _debug("symlink to %*.*s", (int) size, (int) size, buf);
if (size > 2 &&
(buf[0] == '%' || buf[0] == '#') &&
) {
_debug("symlink is a mountpoint");
spin_lock(&vnode->lock);
- vnode->flags |= AFS_VNODE_MOUNTPOINT;
+ set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
spin_unlock(&vnode->lock);
}
struct dentry *dentry,
struct nameidata *nd)
{
- kenter("%p,%p{%p{%s},%s}",
+ _enter("%p,%p{%p{%s},%s}",
dir,
dentry,
dentry->d_parent,
*/
static int afs_mntpt_open(struct inode *inode, struct file *file)
{
- kenter("%p,%p{%p{%s},%s}",
+ _enter("%p,%p{%p{%s},%s}",
inode, file,
file->f_path.dentry->d_parent,
file->f_path.dentry->d_parent ?
char *buf, *devname = NULL, *options = NULL;
int ret;
- kenter("{%s}", mntpt->d_name.name);
+ _enter("{%s}", mntpt->d_name.name);
BUG_ON(!mntpt->d_inode);
strcat(options, ",rwpath");
/* try and do the mount */
- kdebug("--- attempting mount %s -o %s ---", devname, options);
+ _debug("--- attempting mount %s -o %s ---", devname, options);
mnt = vfs_kern_mount(&afs_fs_type, 0, devname, options);
- kdebug("--- mount result %p ---", mnt);
+ _debug("--- mount result %p ---", mnt);
free_page((unsigned long) devname);
free_page((unsigned long) options);
- kleave(" = %p", mnt);
+ _leave(" = %p", mnt);
return mnt;
error:
free_page((unsigned long) devname);
if (options)
free_page((unsigned long) options);
- kleave(" = %d", ret);
+ _leave(" = %d", ret);
return ERR_PTR(ret);
}
static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct vfsmount *newmnt;
- struct dentry *old_dentry;
int err;
- kenter("%p{%s},{%s:%p{%s}}",
+ _enter("%p{%s},{%s:%p{%s}}",
dentry,
dentry->d_name.name,
nd->mnt->mnt_devname,
dentry,
nd->dentry->d_name.name);
- newmnt = afs_mntpt_do_automount(dentry);
+ dput(nd->dentry);
+ nd->dentry = dget(dentry);
+
+ newmnt = afs_mntpt_do_automount(nd->dentry);
if (IS_ERR(newmnt)) {
path_release(nd);
return (void *)newmnt;
}
- old_dentry = nd->dentry;
- nd->dentry = dentry;
- err = do_add_mount(newmnt, nd, 0, &afs_vfsmounts);
- nd->dentry = old_dentry;
-
- path_release(nd);
-
- if (!err) {
- mntget(newmnt);
+ mntget(newmnt);
+ err = do_add_mount(newmnt, nd, MNT_SHRINKABLE, &afs_vfsmounts);
+ switch (err) {
+ case 0:
+ path_release(nd);
nd->mnt = newmnt;
- dget(newmnt->mnt_root);
- nd->dentry = newmnt->mnt_root;
+ nd->dentry = dget(newmnt->mnt_root);
+ schedule_delayed_work(&afs_mntpt_expiry_timer,
+ afs_mntpt_expiry_timeout * HZ);
+ break;
+ case -EBUSY:
+ /* someone else made a mount here whilst we were busy */
+ while (d_mountpoint(nd->dentry) &&
+ follow_down(&nd->mnt, &nd->dentry))
+ ;
+ err = 0;
+ default:
+ mntput(newmnt);
+ break;
}
- kleave(" = %d", err);
+ _leave(" = %d", err);
return ERR_PTR(err);
}
/*
* handle mountpoint expiry timer going off
*/
-static void afs_mntpt_expiry_timed_out(struct afs_timer *timer)
+static void afs_mntpt_expiry_timed_out(struct work_struct *work)
{
- kenter("");
+ _enter("");
+
+ if (!list_empty(&afs_vfsmounts)) {
+ mark_mounts_for_expiry(&afs_vfsmounts);
+ schedule_delayed_work(&afs_mntpt_expiry_timer,
+ afs_mntpt_expiry_timeout * HZ);
+ }
+
+ _leave("");
+}
- mark_mounts_for_expiry(&afs_vfsmounts);
+/*
+ * kill the AFS mountpoint timer if it's still running
+ */
+void afs_mntpt_kill_timer(void)
+{
+ _enter("");
- afs_kafstimod_add_timer(&afs_mntpt_expiry_timer,
- afs_mntpt_expiry_timeout * HZ);
+ ASSERT(list_empty(&afs_vfsmounts));
+ cancel_delayed_work(&afs_mntpt_expiry_timer);
+ flush_scheduled_work();
+}
- kleave("");
+/*
+ * begin unmount by attempting to remove all automounted mountpoints we added
+ */
+void afs_umount_begin(struct vfsmount *vfsmnt, int flags)
+{
+ shrink_submounts(vfsmnt, &afs_vfsmounts);
}
+++ /dev/null
-/* mount parameters
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_MOUNT_H
-#define AFS_MOUNT_H
-
-struct afs_mountdata {
- const char *volume; /* name of volume */
- const char *cell; /* name of cell containing volume */
- const char *cache; /* name of cache block device */
- size_t nservers; /* number of server addresses listed */
- uint32_t servers[10]; /* IP addresses of servers in this cell */
-};
-
-#endif /* AFS_MOUNT_H */
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
-#include "cell.h"
-#include "volume.h"
#include <asm/uaccess.h>
#include "internal.h"
if (strcmp(kbuf, "add") == 0) {
struct afs_cell *cell;
- ret = afs_cell_create(name, args, &cell);
- if (ret < 0)
+
+ cell = afs_cell_create(name, args);
+ if (IS_ERR(cell)) {
+ ret = PTR_ERR(cell);
goto done;
+ }
+ afs_put_cell(cell);
printk("kAFS: Added new cell '%s'\n", name);
} else {
goto inval;
struct seq_file *m;
int ret;
- cell = afs_get_cell_maybe((struct afs_cell **) &PDE(inode)->data);
+ cell = PDE(inode)->data;
if (!cell)
return -ENOENT;
*/
static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file)
{
- struct afs_cell *cell = PDE(inode)->data;
- int ret;
-
- ret = seq_release(inode, file);
-
- afs_put_cell(cell);
- return ret;
+ return seq_release(inode, file);
}
/*
up_read(&cell->vl_sem);
}
+const char afs_vlocation_states[][4] = {
+ [AFS_VL_NEW] = "New",
+ [AFS_VL_CREATING] = "Crt",
+ [AFS_VL_VALID] = "Val",
+ [AFS_VL_NO_VOLUME] = "NoV",
+ [AFS_VL_UPDATING] = "Upd",
+ [AFS_VL_VOLUME_DELETED] = "Del",
+ [AFS_VL_UNCERTAIN] = "Unc",
+};
+
/*
* display a header line followed by a load of volume lines
*/
/* display header on line 1 */
if (v == (void *) 1) {
- seq_puts(m, "USE VLID[0] VLID[1] VLID[2] NAME\n");
+ seq_puts(m, "USE STT VLID[0] VLID[1] VLID[2] NAME\n");
return 0;
}
/* display one cell per line on subsequent lines */
- seq_printf(m, "%3d %08x %08x %08x %s\n",
+ seq_printf(m, "%3d %s %08x %08x %08x %s\n",
atomic_read(&vlocation->usage),
+ afs_vlocation_states[vlocation->state],
vlocation->vldb.vid[0],
vlocation->vldb.vid[1],
vlocation->vldb.vid[2],
struct seq_file *m;
int ret;
- cell = afs_get_cell_maybe((struct afs_cell**)&PDE(inode)->data);
+ cell = PDE(inode)->data;
if (!cell)
return -ENOENT;
- ret = seq_open(file,&afs_proc_cell_vlservers_ops);
+ ret = seq_open(file, &afs_proc_cell_vlservers_ops);
if (ret<0)
return ret;
static int afs_proc_cell_vlservers_release(struct inode *inode,
struct file *file)
{
- struct afs_cell *cell = PDE(inode)->data;
- int ret;
-
- ret = seq_release(inode,file);
-
- afs_put_cell(cell);
- return ret;
+ return seq_release(inode, file);
}
/*
struct seq_file *m;
int ret;
- cell = afs_get_cell_maybe((struct afs_cell **) &PDE(inode)->data);
+ cell = PDE(inode)->data;
if (!cell)
return -ENOENT;
static int afs_proc_cell_servers_release(struct inode *inode,
struct file *file)
{
- struct afs_cell *cell = PDE(inode)->data;
- int ret;
-
- ret = seq_release(inode, file);
-
- afs_put_cell(cell);
- return ret;
+ return seq_release(inode, file);
}
/*
* first item
*/
static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
- __acquires(m->private->sv_lock)
+ __acquires(m->private->servers_lock)
{
struct list_head *_p;
struct afs_cell *cell = m->private;
_enter("cell=%p pos=%Ld", cell, *_pos);
/* lock the list against modification */
- read_lock(&cell->sv_lock);
+ read_lock(&cell->servers_lock);
/* allow for the header line */
if (!pos)
pos--;
/* find the n'th element in the list */
- list_for_each(_p, &cell->sv_list)
+ list_for_each(_p, &cell->servers)
if (!pos--)
break;
- return _p != &cell->sv_list ? _p : NULL;
+ return _p != &cell->servers ? _p : NULL;
}
/*
(*_pos)++;
_p = v;
- _p = v == (void *) 1 ? cell->sv_list.next : _p->next;
+ _p = v == (void *) 1 ? cell->servers.next : _p->next;
- return _p != &cell->sv_list ? _p : NULL;
+ return _p != &cell->servers ? _p : NULL;
}
/*
* clean up after reading from the cells list
*/
static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
- __releases(p->private->sv_lock)
+ __releases(p->private->servers_lock)
{
struct afs_cell *cell = p->private;
- read_unlock(&cell->sv_lock);
+ read_unlock(&cell->servers_lock);
}
/*
--- /dev/null
+/* Maintain an RxRPC server socket to do AFS communications through
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <rxrpc/packet.h>
+#include "internal.h"
+#include "afs_cm.h"
+
+static struct socket *afs_socket; /* my RxRPC socket */
+static struct workqueue_struct *afs_async_calls;
+
+static void afs_wake_up_call_waiter(struct afs_call *);
+static int afs_wait_for_call_to_complete(struct afs_call *);
+static void afs_wake_up_async_call(struct afs_call *);
+static int afs_dont_wait_for_call_to_complete(struct afs_call *);
+static void afs_process_async_call(struct work_struct *);
+static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *);
+static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool);
+
+/* synchronous call management */
+const struct afs_wait_mode afs_sync_call = {
+ .rx_wakeup = afs_wake_up_call_waiter,
+ .wait = afs_wait_for_call_to_complete,
+};
+
+/* asynchronous call management */
+const struct afs_wait_mode afs_async_call = {
+ .rx_wakeup = afs_wake_up_async_call,
+ .wait = afs_dont_wait_for_call_to_complete,
+};
+
+/* asynchronous incoming call management */
+static const struct afs_wait_mode afs_async_incoming_call = {
+ .rx_wakeup = afs_wake_up_async_call,
+};
+
+/* asynchronous incoming call initial processing */
+static const struct afs_call_type afs_RXCMxxxx = {
+ .deliver = afs_deliver_cm_op_id,
+ .abort_to_error = afs_abort_to_error,
+};
+
+static void afs_collect_incoming_call(struct work_struct *);
+
+static struct sk_buff_head afs_incoming_calls;
+static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call);
+
+/*
+ * open an RxRPC socket and bind it to be a server for callback notifications
+ * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
+ */
+int afs_open_socket(void)
+{
+ struct sockaddr_rxrpc srx;
+ struct socket *socket;
+ int ret;
+
+ _enter("");
+
+ skb_queue_head_init(&afs_incoming_calls);
+
+ afs_async_calls = create_singlethread_workqueue("kafsd");
+ if (!afs_async_calls) {
+ _leave(" = -ENOMEM [wq]");
+ return -ENOMEM;
+ }
+
+ ret = sock_create_kern(AF_RXRPC, SOCK_DGRAM, PF_INET, &socket);
+ if (ret < 0) {
+ destroy_workqueue(afs_async_calls);
+ _leave(" = %d [socket]", ret);
+ return ret;
+ }
+
+ socket->sk->sk_allocation = GFP_NOFS;
+
+ /* bind the callback manager's address to make this a server socket */
+ srx.srx_family = AF_RXRPC;
+ srx.srx_service = CM_SERVICE;
+ srx.transport_type = SOCK_DGRAM;
+ srx.transport_len = sizeof(srx.transport.sin);
+ srx.transport.sin.sin_family = AF_INET;
+ srx.transport.sin.sin_port = htons(AFS_CM_PORT);
+ memset(&srx.transport.sin.sin_addr, 0,
+ sizeof(srx.transport.sin.sin_addr));
+
+ ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+ if (ret < 0) {
+ sock_release(socket);
+ _leave(" = %d [bind]", ret);
+ return ret;
+ }
+
+ rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor);
+
+ afs_socket = socket;
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * close the RxRPC socket AFS was using
+ */
+void afs_close_socket(void)
+{
+ _enter("");
+
+ sock_release(afs_socket);
+
+ _debug("dework");
+ destroy_workqueue(afs_async_calls);
+ _leave("");
+}
+
+/*
+ * allocate a call with flat request and reply buffers
+ */
+struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
+ size_t request_size, size_t reply_size)
+{
+ struct afs_call *call;
+
+ call = kzalloc(sizeof(*call), GFP_NOFS);
+ if (!call)
+ goto nomem_call;
+
+ if (request_size) {
+ call->request = kmalloc(request_size, GFP_NOFS);
+ if (!call->request)
+ goto nomem_request;
+ }
+
+ if (reply_size) {
+ call->buffer = kmalloc(reply_size, GFP_NOFS);
+ if (!call->buffer)
+ goto nomem_buffer;
+ }
+
+ call->type = type;
+ call->request_size = request_size;
+ call->reply_max = reply_size;
+
+ init_waitqueue_head(&call->waitq);
+ skb_queue_head_init(&call->rx_queue);
+ return call;
+
+nomem_buffer:
+ kfree(call->request);
+nomem_request:
+ kfree(call);
+nomem_call:
+ return NULL;
+}
+
+/*
+ * clean up a call with flat buffer
+ */
+void afs_flat_call_destructor(struct afs_call *call)
+{
+ _enter("");
+
+ kfree(call->request);
+ call->request = NULL;
+ kfree(call->buffer);
+ call->buffer = NULL;
+}
+
+/*
+ * initiate a call
+ */
+int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
+ const struct afs_wait_mode *wait_mode)
+{
+ struct sockaddr_rxrpc srx;
+ struct rxrpc_call *rxcall;
+ struct msghdr msg;
+ struct kvec iov[1];
+ int ret;
+
+ _enter("%x,{%d},", addr->s_addr, ntohs(call->port));
+
+ call->wait_mode = wait_mode;
+ INIT_WORK(&call->async_work, afs_process_async_call);
+
+ memset(&srx, 0, sizeof(srx));
+ srx.srx_family = AF_RXRPC;
+ srx.srx_service = call->service_id;
+ srx.transport_type = SOCK_DGRAM;
+ srx.transport_len = sizeof(srx.transport.sin);
+ srx.transport.sin.sin_family = AF_INET;
+ srx.transport.sin.sin_port = call->port;
+ memcpy(&srx.transport.sin.sin_addr, addr, 4);
+
+ /* create a call */
+ rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key,
+ (unsigned long) call, gfp);
+ if (IS_ERR(rxcall)) {
+ ret = PTR_ERR(rxcall);
+ goto error_kill_call;
+ }
+
+ call->rxcall = rxcall;
+
+ /* send the request */
+ iov[0].iov_base = call->request;
+ iov[0].iov_len = call->request_size;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = (struct iovec *) iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ /* have to change the state *before* sending the last packet as RxRPC
+ * might give us the reply before it returns from sending the
+ * request */
+ call->state = AFS_CALL_AWAIT_REPLY;
+ ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size);
+ if (ret < 0)
+ goto error_do_abort;
+
+ /* at this point, an async call may no longer exist as it may have
+ * already completed */
+ return wait_mode->wait(call);
+
+error_do_abort:
+ rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT);
+ rxrpc_kernel_end_call(rxcall);
+error_kill_call:
+ call->type->destructor(call);
+ ASSERT(skb_queue_empty(&call->rx_queue));
+ kfree(call);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * handles intercepted messages that were arriving in the socket's Rx queue
+ * - called with the socket receive queue lock held to ensure message ordering
+ * - called with softirqs disabled
+ */
+static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID,
+ struct sk_buff *skb)
+{
+ struct afs_call *call = (struct afs_call *) user_call_ID;
+
+ _enter("%p,,%u", call, skb->mark);
+
+ ASSERTCMP(sk, ==, afs_socket->sk);
+
+ if (!call) {
+ /* its an incoming call for our callback service */
+ __skb_queue_tail(&afs_incoming_calls, skb);
+ schedule_work(&afs_collect_incoming_call_work);
+ } else {
+ /* route the messages directly to the appropriate call */
+ __skb_queue_tail(&call->rx_queue, skb);
+ call->wait_mode->rx_wakeup(call);
+ }
+
+ _leave("");
+}
+
+/*
+ * deliver messages to a call
+ */
+static void afs_deliver_to_call(struct afs_call *call)
+{
+ struct sk_buff *skb;
+ bool last;
+ u32 abort_code;
+ int ret;
+
+ _enter("");
+
+ while ((call->state == AFS_CALL_AWAIT_REPLY ||
+ call->state == AFS_CALL_AWAIT_OP_ID ||
+ call->state == AFS_CALL_AWAIT_REQUEST ||
+ call->state == AFS_CALL_AWAIT_ACK) &&
+ (skb = skb_dequeue(&call->rx_queue))) {
+ switch (skb->mark) {
+ case RXRPC_SKB_MARK_DATA:
+ _debug("Rcv DATA");
+ last = rxrpc_kernel_is_data_last(skb);
+ ret = call->type->deliver(call, skb, last);
+ switch (ret) {
+ case 0:
+ if (last &&
+ call->state == AFS_CALL_AWAIT_REPLY)
+ call->state = AFS_CALL_COMPLETE;
+ break;
+ case -ENOTCONN:
+ abort_code = RX_CALL_DEAD;
+ goto do_abort;
+ case -ENOTSUPP:
+ abort_code = RX_INVALID_OPERATION;
+ goto do_abort;
+ default:
+ abort_code = RXGEN_CC_UNMARSHAL;
+ if (call->state != AFS_CALL_AWAIT_REPLY)
+ abort_code = RXGEN_SS_UNMARSHAL;
+ do_abort:
+ rxrpc_kernel_abort_call(call->rxcall,
+ abort_code);
+ call->error = ret;
+ call->state = AFS_CALL_ERROR;
+ break;
+ }
+ rxrpc_kernel_data_delivered(skb);
+ skb = NULL;
+ break;
+ case RXRPC_SKB_MARK_FINAL_ACK:
+ _debug("Rcv ACK");
+ call->state = AFS_CALL_COMPLETE;
+ break;
+ case RXRPC_SKB_MARK_BUSY:
+ _debug("Rcv BUSY");
+ call->error = -EBUSY;
+ call->state = AFS_CALL_BUSY;
+ break;
+ case RXRPC_SKB_MARK_REMOTE_ABORT:
+ abort_code = rxrpc_kernel_get_abort_code(skb);
+ call->error = call->type->abort_to_error(abort_code);
+ call->state = AFS_CALL_ABORTED;
+ _debug("Rcv ABORT %u -> %d", abort_code, call->error);
+ break;
+ case RXRPC_SKB_MARK_NET_ERROR:
+ call->error = -rxrpc_kernel_get_error_number(skb);
+ call->state = AFS_CALL_ERROR;
+ _debug("Rcv NET ERROR %d", call->error);
+ break;
+ case RXRPC_SKB_MARK_LOCAL_ERROR:
+ call->error = -rxrpc_kernel_get_error_number(skb);
+ call->state = AFS_CALL_ERROR;
+ _debug("Rcv LOCAL ERROR %d", call->error);
+ break;
+ default:
+ BUG();
+ break;
+ }
+
+ rxrpc_kernel_free_skb(skb);
+ }
+
+ /* make sure the queue is empty if the call is done with (we might have
+ * aborted the call early because of an unmarshalling error) */
+ if (call->state >= AFS_CALL_COMPLETE) {
+ while ((skb = skb_dequeue(&call->rx_queue)))
+ rxrpc_kernel_free_skb(skb);
+ if (call->incoming) {
+ rxrpc_kernel_end_call(call->rxcall);
+ call->type->destructor(call);
+ ASSERT(skb_queue_empty(&call->rx_queue));
+ kfree(call);
+ }
+ }
+
+ _leave("");
+}
+
+/*
+ * wait synchronously for a call to complete
+ */
+static int afs_wait_for_call_to_complete(struct afs_call *call)
+{
+ struct sk_buff *skb;
+ int ret;
+
+ DECLARE_WAITQUEUE(myself, current);
+
+ _enter("");
+
+ add_wait_queue(&call->waitq, &myself);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ /* deliver any messages that are in the queue */
+ if (!skb_queue_empty(&call->rx_queue)) {
+ __set_current_state(TASK_RUNNING);
+ afs_deliver_to_call(call);
+ continue;
+ }
+
+ ret = call->error;
+ if (call->state >= AFS_CALL_COMPLETE)
+ break;
+ ret = -EINTR;
+ if (signal_pending(current))
+ break;
+ schedule();
+ }
+
+ remove_wait_queue(&call->waitq, &myself);
+ __set_current_state(TASK_RUNNING);
+
+ /* kill the call */
+ if (call->state < AFS_CALL_COMPLETE) {
+ _debug("call incomplete");
+ rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD);
+ while ((skb = skb_dequeue(&call->rx_queue)))
+ rxrpc_kernel_free_skb(skb);
+ }
+
+ _debug("call complete");
+ rxrpc_kernel_end_call(call->rxcall);
+ call->type->destructor(call);
+ ASSERT(skb_queue_empty(&call->rx_queue));
+ kfree(call);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * wake up a waiting call
+ */
+static void afs_wake_up_call_waiter(struct afs_call *call)
+{
+ wake_up(&call->waitq);
+}
+
+/*
+ * wake up an asynchronous call
+ */
+static void afs_wake_up_async_call(struct afs_call *call)
+{
+ _enter("");
+ queue_work(afs_async_calls, &call->async_work);
+}
+
+/*
+ * put a call into asynchronous mode
+ * - mustn't touch the call descriptor as the call my have completed by the
+ * time we get here
+ */
+static int afs_dont_wait_for_call_to_complete(struct afs_call *call)
+{
+ _enter("");
+ return -EINPROGRESS;
+}
+
+/*
+ * delete an asynchronous call
+ */
+static void afs_delete_async_call(struct work_struct *work)
+{
+ struct afs_call *call =
+ container_of(work, struct afs_call, async_work);
+
+ _enter("");
+
+ ASSERT(skb_queue_empty(&call->rx_queue));
+ ASSERT(!work_pending(&call->async_work));
+ kfree(call);
+
+ _leave("");
+}
+
+/*
+ * perform processing on an asynchronous call
+ * - on a multiple-thread workqueue this work item may try to run on several
+ * CPUs at the same time
+ */
+static void afs_process_async_call(struct work_struct *work)
+{
+ struct afs_call *call =
+ container_of(work, struct afs_call, async_work);
+
+ _enter("");
+
+ if (!skb_queue_empty(&call->rx_queue))
+ afs_deliver_to_call(call);
+
+ if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) {
+ if (call->wait_mode->async_complete)
+ call->wait_mode->async_complete(call->reply,
+ call->error);
+ call->reply = NULL;
+
+ /* kill the call */
+ rxrpc_kernel_end_call(call->rxcall);
+ if (call->type->destructor)
+ call->type->destructor(call);
+
+ /* we can't just delete the call because the work item may be
+ * queued */
+ PREPARE_WORK(&call->async_work, afs_delete_async_call);
+ queue_work(afs_async_calls, &call->async_work);
+ }
+
+ _leave("");
+}
+
+/*
+ * empty a socket buffer into a flat reply buffer
+ */
+void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb)
+{
+ size_t len = skb->len;
+
+ if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0)
+ BUG();
+ call->reply_size += len;
+}
+
+/*
+ * accept the backlog of incoming calls
+ */
+static void afs_collect_incoming_call(struct work_struct *work)
+{
+ struct rxrpc_call *rxcall;
+ struct afs_call *call = NULL;
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(&afs_incoming_calls))) {
+ _debug("new call");
+
+ /* don't need the notification */
+ rxrpc_kernel_free_skb(skb);
+
+ if (!call) {
+ call = kzalloc(sizeof(struct afs_call), GFP_KERNEL);
+ if (!call) {
+ rxrpc_kernel_reject_call(afs_socket);
+ return;
+ }
+
+ INIT_WORK(&call->async_work, afs_process_async_call);
+ call->wait_mode = &afs_async_incoming_call;
+ call->type = &afs_RXCMxxxx;
+ init_waitqueue_head(&call->waitq);
+ skb_queue_head_init(&call->rx_queue);
+ call->state = AFS_CALL_AWAIT_OP_ID;
+ }
+
+ rxcall = rxrpc_kernel_accept_call(afs_socket,
+ (unsigned long) call);
+ if (!IS_ERR(rxcall)) {
+ call->rxcall = rxcall;
+ call = NULL;
+ }
+ }
+
+ kfree(call);
+}
+
+/*
+ * grab the operation ID from an incoming cache manager call
+ */
+static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb,
+ bool last)
+{
+ size_t len = skb->len;
+ void *oibuf = (void *) &call->operation_ID;
+
+ _enter("{%u},{%zu},%d", call->offset, len, last);
+
+ ASSERTCMP(call->offset, <, 4);
+
+ /* the operation ID forms the first four bytes of the request data */
+ len = min_t(size_t, len, 4 - call->offset);
+ if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0)
+ BUG();
+ if (!pskb_pull(skb, len))
+ BUG();
+ call->offset += len;
+
+ if (call->offset < 4) {
+ if (last) {
+ _leave(" = -EBADMSG [op ID short]");
+ return -EBADMSG;
+ }
+ _leave(" = 0 [incomplete]");
+ return 0;
+ }
+
+ call->state = AFS_CALL_AWAIT_REQUEST;
+
+ /* ask the cache manager to route the call (it'll change the call type
+ * if successful) */
+ if (!afs_cm_incoming_call(call))
+ return -ENOTSUPP;
+
+ /* pass responsibility for the remainer of this message off to the
+ * cache manager op */
+ return call->type->deliver(call, skb, last);
+}
+
+/*
+ * send an empty reply
+ */
+void afs_send_empty_reply(struct afs_call *call)
+{
+ struct msghdr msg;
+ struct iovec iov[1];
+
+ _enter("");
+
+ iov[0].iov_base = NULL;
+ iov[0].iov_len = 0;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 0;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ call->state = AFS_CALL_AWAIT_ACK;
+ switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) {
+ case 0:
+ _leave(" [replied]");
+ return;
+
+ case -ENOMEM:
+ _debug("oom");
+ rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT);
+ default:
+ rxrpc_kernel_end_call(call->rxcall);
+ call->rxcall = NULL;
+ call->type->destructor(call);
+ ASSERT(skb_queue_empty(&call->rx_queue));
+ kfree(call);
+ _leave(" [error]");
+ return;
+ }
+}
+
+/*
+ * extract a piece of data from the received data socket buffers
+ */
+int afs_extract_data(struct afs_call *call, struct sk_buff *skb,
+ bool last, void *buf, size_t count)
+{
+ size_t len = skb->len;
+
+ _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count);
+
+ ASSERTCMP(call->offset, <, count);
+
+ len = min_t(size_t, len, count - call->offset);
+ if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 ||
+ !pskb_pull(skb, len))
+ BUG();
+ call->offset += len;
+
+ if (call->offset < count) {
+ if (last) {
+ _leave(" = -EBADMSG [%d < %lu]", call->offset, count);
+ return -EBADMSG;
+ }
+ _leave(" = -EAGAIN");
+ return -EAGAIN;
+ }
+ return 0;
+}
/* AFS server record management
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/sched.h>
#include <linux/slab.h>
-#include <rxrpc/peer.h>
-#include <rxrpc/connection.h>
-#include "volume.h"
-#include "cell.h"
-#include "server.h"
-#include "transport.h"
-#include "vlclient.h"
-#include "kafstimod.h"
#include "internal.h"
-DEFINE_SPINLOCK(afs_server_peer_lock);
+unsigned afs_server_timeout = 10; /* server timeout in seconds */
-#define FS_SERVICE_ID 1 /* AFS Volume Location Service ID */
-#define VL_SERVICE_ID 52 /* AFS Volume Location Service ID */
+static void afs_reap_server(struct work_struct *);
-static void __afs_server_timeout(struct afs_timer *timer)
+/* tree of all the servers, indexed by IP address */
+static struct rb_root afs_servers = RB_ROOT;
+static DEFINE_RWLOCK(afs_servers_lock);
+
+/* LRU list of all the servers not currently in use */
+static LIST_HEAD(afs_server_graveyard);
+static DEFINE_SPINLOCK(afs_server_graveyard_lock);
+static DECLARE_DELAYED_WORK(afs_server_reaper, afs_reap_server);
+
+/*
+ * install a server record in the master tree
+ */
+static int afs_install_server(struct afs_server *server)
{
- struct afs_server *server =
- list_entry(timer, struct afs_server, timeout);
+ struct afs_server *xserver;
+ struct rb_node **pp, *p;
+ int ret;
+
+ _enter("%p", server);
- _debug("SERVER TIMEOUT [%p{u=%d}]",
- server, atomic_read(&server->usage));
+ write_lock(&afs_servers_lock);
+
+ ret = -EEXIST;
+ pp = &afs_servers.rb_node;
+ p = NULL;
+ while (*pp) {
+ p = *pp;
+ _debug("- consider %p", p);
+ xserver = rb_entry(p, struct afs_server, master_rb);
+ if (server->addr.s_addr < xserver->addr.s_addr)
+ pp = &(*pp)->rb_left;
+ else if (server->addr.s_addr > xserver->addr.s_addr)
+ pp = &(*pp)->rb_right;
+ else
+ goto error;
+ }
- afs_server_do_timeout(server);
-}
+ rb_link_node(&server->master_rb, p, pp);
+ rb_insert_color(&server->master_rb, &afs_servers);
+ ret = 0;
-static const struct afs_timer_ops afs_server_timer_ops = {
- .timed_out = __afs_server_timeout,
-};
+error:
+ write_unlock(&afs_servers_lock);
+ return ret;
+}
/*
- * lookup a server record in a cell
- * - TODO: search the cell's server list
+ * allocate a new server record
*/
-int afs_server_lookup(struct afs_cell *cell, const struct in_addr *addr,
- struct afs_server **_server)
+static struct afs_server *afs_alloc_server(struct afs_cell *cell,
+ const struct in_addr *addr)
{
- struct afs_server *server, *active, *zombie;
- int loop;
+ struct afs_server *server;
- _enter("%p,%08x,", cell, ntohl(addr->s_addr));
+ _enter("");
- /* allocate and initialise a server record */
server = kzalloc(sizeof(struct afs_server), GFP_KERNEL);
- if (!server) {
- _leave(" = -ENOMEM");
- return -ENOMEM;
+ if (server) {
+ atomic_set(&server->usage, 1);
+ server->cell = cell;
+
+ INIT_LIST_HEAD(&server->link);
+ INIT_LIST_HEAD(&server->grave);
+ init_rwsem(&server->sem);
+ spin_lock_init(&server->fs_lock);
+ server->fs_vnodes = RB_ROOT;
+ server->cb_promises = RB_ROOT;
+ spin_lock_init(&server->cb_lock);
+ init_waitqueue_head(&server->cb_break_waitq);
+ INIT_DELAYED_WORK(&server->cb_break_work,
+ afs_dispatch_give_up_callbacks);
+
+ memcpy(&server->addr, addr, sizeof(struct in_addr));
+ server->addr.s_addr = addr->s_addr;
}
- atomic_set(&server->usage, 1);
-
- INIT_LIST_HEAD(&server->link);
- init_rwsem(&server->sem);
- INIT_LIST_HEAD(&server->fs_callq);
- spin_lock_init(&server->fs_lock);
- INIT_LIST_HEAD(&server->cb_promises);
- spin_lock_init(&server->cb_lock);
-
- for (loop = 0; loop < AFS_SERVER_CONN_LIST_SIZE; loop++)
- server->fs_conn_cnt[loop] = 4;
+ _leave(" = %p{%d}", server, atomic_read(&server->usage));
+ return server;
+}
- memcpy(&server->addr, addr, sizeof(struct in_addr));
- server->addr.s_addr = addr->s_addr;
+/*
+ * get an FS-server record for a cell
+ */
+struct afs_server *afs_lookup_server(struct afs_cell *cell,
+ const struct in_addr *addr)
+{
+ struct afs_server *server, *candidate;
- afs_timer_init(&server->timeout, &afs_server_timer_ops);
+ _enter("%p,"NIPQUAD_FMT, cell, NIPQUAD(addr->s_addr));
- /* add to the cell */
- write_lock(&cell->sv_lock);
+ /* quick scan of the list to see if we already have the server */
+ read_lock(&cell->servers_lock);
- /* check the active list */
- list_for_each_entry(active, &cell->sv_list, link) {
- if (active->addr.s_addr == addr->s_addr)
- goto use_active_server;
+ list_for_each_entry(server, &cell->servers, link) {
+ if (server->addr.s_addr == addr->s_addr)
+ goto found_server_quickly;
}
+ read_unlock(&cell->servers_lock);
- /* check the inactive list */
- spin_lock(&cell->sv_gylock);
- list_for_each_entry(zombie, &cell->sv_graveyard, link) {
- if (zombie->addr.s_addr == addr->s_addr)
- goto resurrect_server;
+ candidate = afs_alloc_server(cell, addr);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
}
- spin_unlock(&cell->sv_gylock);
- afs_get_cell(cell);
- server->cell = cell;
- list_add_tail(&server->link, &cell->sv_list);
+ write_lock(&cell->servers_lock);
- write_unlock(&cell->sv_lock);
+ /* check the cell's server list again */
+ list_for_each_entry(server, &cell->servers, link) {
+ if (server->addr.s_addr == addr->s_addr)
+ goto found_server;
+ }
+
+ _debug("new");
+ server = candidate;
+ if (afs_install_server(server) < 0)
+ goto server_in_two_cells;
- *_server = server;
- _leave(" = 0 (%p)", server);
- return 0;
+ afs_get_cell(cell);
+ list_add_tail(&server->link, &cell->servers);
+
+ write_unlock(&cell->servers_lock);
+ _leave(" = %p{%d}", server, atomic_read(&server->usage));
+ return server;
+
+ /* found a matching server quickly */
+found_server_quickly:
+ _debug("found quickly");
+ afs_get_server(server);
+ read_unlock(&cell->servers_lock);
+no_longer_unused:
+ if (!list_empty(&server->grave)) {
+ spin_lock(&afs_server_graveyard_lock);
+ list_del_init(&server->grave);
+ spin_unlock(&afs_server_graveyard_lock);
+ }
+ _leave(" = %p{%d}", server, atomic_read(&server->usage));
+ return server;
+
+ /* found a matching server on the second pass */
+found_server:
+ _debug("found");
+ afs_get_server(server);
+ write_unlock(&cell->servers_lock);
+ kfree(candidate);
+ goto no_longer_unused;
+
+ /* found a server that seems to be in two cells */
+server_in_two_cells:
+ write_unlock(&cell->servers_lock);
+ kfree(candidate);
+ printk(KERN_NOTICE "kAFS:"
+ " Server "NIPQUAD_FMT" appears to be in two cells\n",
+ NIPQUAD(*addr));
+ _leave(" = -EEXIST");
+ return ERR_PTR(-EEXIST);
+}
- /* found a matching active server */
-use_active_server:
- _debug("active server");
- afs_get_server(active);
- write_unlock(&cell->sv_lock);
+/*
+ * look up a server by its IP address
+ */
+struct afs_server *afs_find_server(const struct in_addr *_addr)
+{
+ struct afs_server *server = NULL;
+ struct rb_node *p;
+ struct in_addr addr = *_addr;
- kfree(server);
+ _enter(NIPQUAD_FMT, NIPQUAD(addr.s_addr));
- *_server = active;
- _leave(" = 0 (%p)", active);
- return 0;
+ read_lock(&afs_servers_lock);
- /* found a matching server in the graveyard, so resurrect it and
- * dispose of the new record */
-resurrect_server:
- _debug("resurrecting server");
+ p = afs_servers.rb_node;
+ while (p) {
+ server = rb_entry(p, struct afs_server, master_rb);
- list_move_tail(&zombie->link, &cell->sv_list);
- afs_get_server(zombie);
- afs_kafstimod_del_timer(&zombie->timeout);
- spin_unlock(&cell->sv_gylock);
- write_unlock(&cell->sv_lock);
+ _debug("- consider %p", p);
- kfree(server);
+ if (addr.s_addr < server->addr.s_addr) {
+ p = p->rb_left;
+ } else if (addr.s_addr > server->addr.s_addr) {
+ p = p->rb_right;
+ } else {
+ afs_get_server(server);
+ goto found;
+ }
+ }
- *_server = zombie;
- _leave(" = 0 (%p)", zombie);
- return 0;
+ server = NULL;
+found:
+ read_unlock(&afs_servers_lock);
+ ASSERTIFCMP(server, server->addr.s_addr, ==, addr.s_addr);
+ _leave(" = %p", server);
+ return server;
}
/*
*/
void afs_put_server(struct afs_server *server)
{
- struct afs_cell *cell;
-
if (!server)
return;
- _enter("%p", server);
-
- cell = server->cell;
+ _enter("%p{%d}", server, atomic_read(&server->usage));
- /* sanity check */
- BUG_ON(atomic_read(&server->usage) <= 0);
-
- /* to prevent a race, the decrement and the dequeue must be effectively
- * atomic */
- write_lock(&cell->sv_lock);
+ ASSERTCMP(atomic_read(&server->usage), >, 0);
if (likely(!atomic_dec_and_test(&server->usage))) {
- write_unlock(&cell->sv_lock);
_leave("");
return;
}
- spin_lock(&cell->sv_gylock);
- list_move_tail(&server->link, &cell->sv_graveyard);
-
- /* time out in 10 secs */
- afs_kafstimod_add_timer(&server->timeout, 10 * HZ);
-
- spin_unlock(&cell->sv_gylock);
- write_unlock(&cell->sv_lock);
+ afs_flush_callback_breaks(server);
- _leave(" [killed]");
+ spin_lock(&afs_server_graveyard_lock);
+ if (atomic_read(&server->usage) == 0) {
+ list_move_tail(&server->grave, &afs_server_graveyard);
+ server->time_of_death = get_seconds();
+ schedule_delayed_work(&afs_server_reaper,
+ afs_server_timeout * HZ);
+ }
+ spin_unlock(&afs_server_graveyard_lock);
+ _leave(" [dead]");
}
/*
- * timeout server record
- * - removes from the cell's graveyard if the usage count is zero
+ * destroy a dead server
*/
-void afs_server_do_timeout(struct afs_server *server)
+static void afs_destroy_server(struct afs_server *server)
{
- struct rxrpc_peer *peer;
- struct afs_cell *cell;
- int loop;
-
_enter("%p", server);
- cell = server->cell;
-
- BUG_ON(atomic_read(&server->usage) < 0);
-
- /* remove from graveyard if still dead */
- spin_lock(&cell->vl_gylock);
- if (atomic_read(&server->usage) == 0)
- list_del_init(&server->link);
- else
- server = NULL;
- spin_unlock(&cell->vl_gylock);
-
- if (!server) {
- _leave("");
- return; /* resurrected */
- }
-
- /* we can now destroy it properly */
- afs_put_cell(cell);
-
- /* uncross-point the structs under a global lock */
- spin_lock(&afs_server_peer_lock);
- peer = server->peer;
- if (peer) {
- server->peer = NULL;
- peer->user = NULL;
- }
- spin_unlock(&afs_server_peer_lock);
-
- /* finish cleaning up the server */
- for (loop = AFS_SERVER_CONN_LIST_SIZE - 1; loop >= 0; loop--)
- if (server->fs_conn[loop])
- rxrpc_put_connection(server->fs_conn[loop]);
-
- if (server->vlserver)
- rxrpc_put_connection(server->vlserver);
+ ASSERTCMP(server->fs_vnodes.rb_node, ==, NULL);
+ ASSERTCMP(server->cb_promises.rb_node, ==, NULL);
+ ASSERTCMP(server->cb_break_head, ==, server->cb_break_tail);
+ ASSERTCMP(atomic_read(&server->cb_break_n), ==, 0);
+ afs_put_cell(server->cell);
kfree(server);
-
- _leave(" [destroyed]");
}
/*
- * get a callslot on a connection to the fileserver on the specified server
+ * reap dead server records
*/
-int afs_server_request_callslot(struct afs_server *server,
- struct afs_server_callslot *callslot)
+static void afs_reap_server(struct work_struct *work)
{
- struct afs_server_callslot *pcallslot;
- struct rxrpc_connection *conn;
- int nconn, ret;
-
- _enter("%p,",server);
-
- INIT_LIST_HEAD(&callslot->link);
- callslot->task = current;
- callslot->conn = NULL;
- callslot->nconn = -1;
- callslot->ready = 0;
-
- ret = 0;
- conn = NULL;
-
- /* get hold of a callslot first */
- spin_lock(&server->fs_lock);
-
- /* resurrect the server if it's death timeout has expired */
- if (server->fs_state) {
- if (time_before(jiffies, server->fs_dead_jif)) {
- ret = server->fs_state;
- spin_unlock(&server->fs_lock);
- _leave(" = %d [still dead]", ret);
- return ret;
+ LIST_HEAD(corpses);
+ struct afs_server *server;
+ unsigned long delay, expiry;
+ time_t now;
+
+ now = get_seconds();
+ spin_lock(&afs_server_graveyard_lock);
+
+ while (!list_empty(&afs_server_graveyard)) {
+ server = list_entry(afs_server_graveyard.next,
+ struct afs_server, grave);
+
+ /* the queue is ordered most dead first */
+ expiry = server->time_of_death + afs_server_timeout;
+ if (expiry > now) {
+ delay = (expiry - now) * HZ;
+ if (!schedule_delayed_work(&afs_server_reaper, delay)) {
+ cancel_delayed_work(&afs_server_reaper);
+ schedule_delayed_work(&afs_server_reaper,
+ delay);
+ }
+ break;
}
- server->fs_state = 0;
- }
-
- /* try and find a connection that has spare callslots */
- for (nconn = 0; nconn < AFS_SERVER_CONN_LIST_SIZE; nconn++) {
- if (server->fs_conn_cnt[nconn] > 0) {
- server->fs_conn_cnt[nconn]--;
- spin_unlock(&server->fs_lock);
- callslot->nconn = nconn;
- goto obtained_slot;
+ write_lock(&server->cell->servers_lock);
+ write_lock(&afs_servers_lock);
+ if (atomic_read(&server->usage) > 0) {
+ list_del_init(&server->grave);
+ } else {
+ list_move_tail(&server->grave, &corpses);
+ list_del_init(&server->link);
+ rb_erase(&server->master_rb, &afs_servers);
}
+ write_unlock(&afs_servers_lock);
+ write_unlock(&server->cell->servers_lock);
}
- /* none were available - wait interruptibly for one to become
- * available */
- set_current_state(TASK_INTERRUPTIBLE);
- list_add_tail(&callslot->link, &server->fs_callq);
- spin_unlock(&server->fs_lock);
-
- while (!callslot->ready && !signal_pending(current)) {
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
- }
-
- set_current_state(TASK_RUNNING);
-
- /* even if we were interrupted we may still be queued */
- if (!callslot->ready) {
- spin_lock(&server->fs_lock);
- list_del_init(&callslot->link);
- spin_unlock(&server->fs_lock);
- }
-
- nconn = callslot->nconn;
-
- /* if interrupted, we must release any slot we also got before
- * returning an error */
- if (signal_pending(current)) {
- ret = -EINTR;
- goto error_release;
- }
-
- /* if we were woken up with an error, then pass that error back to the
- * called */
- if (nconn < 0) {
- _leave(" = %d", callslot->errno);
- return callslot->errno;
- }
-
- /* were we given a connection directly? */
- if (callslot->conn) {
- /* yes - use it */
- _leave(" = 0 (nc=%d)", nconn);
- return 0;
- }
+ spin_unlock(&afs_server_graveyard_lock);
- /* got a callslot, but no connection */
-obtained_slot:
-
- /* need to get hold of the RxRPC connection */
- down_write(&server->sem);
-
- /* quick check to see if there's an outstanding error */
- ret = server->fs_state;
- if (ret)
- goto error_release_upw;
-
- if (server->fs_conn[nconn]) {
- /* reuse an existing connection */
- rxrpc_get_connection(server->fs_conn[nconn]);
- callslot->conn = server->fs_conn[nconn];
- } else {
- /* create a new connection */
- ret = rxrpc_create_connection(afs_transport,
- htons(7000),
- server->addr.s_addr,
- FS_SERVICE_ID,
- NULL,
- &server->fs_conn[nconn]);
-
- if (ret < 0)
- goto error_release_upw;
-
- callslot->conn = server->fs_conn[0];
- rxrpc_get_connection(callslot->conn);
+ /* now reap the corpses we've extracted */
+ while (!list_empty(&corpses)) {
+ server = list_entry(corpses.next, struct afs_server, grave);
+ list_del(&server->grave);
+ afs_destroy_server(server);
}
-
- up_write(&server->sem);
-
- _leave(" = 0");
- return 0;
-
- /* handle an error occurring */
-error_release_upw:
- up_write(&server->sem);
-
-error_release:
- /* either release the callslot or pass it along to another deserving
- * task */
- spin_lock(&server->fs_lock);
-
- if (nconn < 0) {
- /* no callslot allocated */
- } else if (list_empty(&server->fs_callq)) {
- /* no one waiting */
- server->fs_conn_cnt[nconn]++;
- spin_unlock(&server->fs_lock);
- } else {
- /* someone's waiting - dequeue them and wake them up */
- pcallslot = list_entry(server->fs_callq.next,
- struct afs_server_callslot, link);
- list_del_init(&pcallslot->link);
-
- pcallslot->errno = server->fs_state;
- if (!pcallslot->errno) {
- /* pass them out callslot details */
- callslot->conn = xchg(&pcallslot->conn,
- callslot->conn);
- pcallslot->nconn = nconn;
- callslot->nconn = nconn = -1;
- }
- pcallslot->ready = 1;
- wake_up_process(pcallslot->task);
- spin_unlock(&server->fs_lock);
- }
-
- rxrpc_put_connection(callslot->conn);
- callslot->conn = NULL;
-
- _leave(" = %d", ret);
- return ret;
}
/*
- * release a callslot back to the server
- * - transfers the RxRPC connection to the next pending callslot if possible
+ * discard all the server records for rmmod
*/
-void afs_server_release_callslot(struct afs_server *server,
- struct afs_server_callslot *callslot)
+void __exit afs_purge_servers(void)
{
- struct afs_server_callslot *pcallslot;
-
- _enter("{ad=%08x,cnt=%u},{%d}",
- ntohl(server->addr.s_addr),
- server->fs_conn_cnt[callslot->nconn],
- callslot->nconn);
-
- BUG_ON(callslot->nconn < 0);
-
- spin_lock(&server->fs_lock);
-
- if (list_empty(&server->fs_callq)) {
- /* no one waiting */
- server->fs_conn_cnt[callslot->nconn]++;
- spin_unlock(&server->fs_lock);
- } else {
- /* someone's waiting - dequeue them and wake them up */
- pcallslot = list_entry(server->fs_callq.next,
- struct afs_server_callslot, link);
- list_del_init(&pcallslot->link);
-
- pcallslot->errno = server->fs_state;
- if (!pcallslot->errno) {
- /* pass them out callslot details */
- callslot->conn = xchg(&pcallslot->conn, callslot->conn);
- pcallslot->nconn = callslot->nconn;
- callslot->nconn = -1;
- }
-
- pcallslot->ready = 1;
- wake_up_process(pcallslot->task);
- spin_unlock(&server->fs_lock);
- }
-
- rxrpc_put_connection(callslot->conn);
-
- _leave("");
-}
-
-/*
- * get a handle to a connection to the vlserver (volume location) on the
- * specified server
- */
-int afs_server_get_vlconn(struct afs_server *server,
- struct rxrpc_connection **_conn)
-{
- struct rxrpc_connection *conn;
- int ret;
-
- _enter("%p,", server);
-
- ret = 0;
- conn = NULL;
- down_read(&server->sem);
-
- if (server->vlserver) {
- /* reuse an existing connection */
- rxrpc_get_connection(server->vlserver);
- conn = server->vlserver;
- up_read(&server->sem);
- } else {
- /* create a new connection */
- up_read(&server->sem);
- down_write(&server->sem);
- if (!server->vlserver) {
- ret = rxrpc_create_connection(afs_transport,
- htons(7003),
- server->addr.s_addr,
- VL_SERVICE_ID,
- NULL,
- &server->vlserver);
- }
- if (ret == 0) {
- rxrpc_get_connection(server->vlserver);
- conn = server->vlserver;
- }
- up_write(&server->sem);
- }
-
- *_conn = conn;
- _leave(" = %d", ret);
- return ret;
+ afs_server_timeout = 0;
+ cancel_delayed_work(&afs_server_reaper);
+ schedule_delayed_work(&afs_server_reaper, 0);
}
+++ /dev/null
-/* AFS server record
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_SERVER_H
-#define AFS_SERVER_H
-
-#include "types.h"
-#include "kafstimod.h"
-#include <rxrpc/peer.h>
-#include <linux/rwsem.h>
-
-extern spinlock_t afs_server_peer_lock;
-
-/*
- * AFS server record
- */
-struct afs_server {
- atomic_t usage;
- struct afs_cell *cell; /* cell in which server resides */
- struct list_head link; /* link in cell's server list */
- struct rw_semaphore sem; /* access lock */
- struct afs_timer timeout; /* graveyard timeout */
- struct in_addr addr; /* server address */
- struct rxrpc_peer *peer; /* peer record for this server */
- struct rxrpc_connection *vlserver; /* connection to the volume location service */
-
- /* file service access */
-#define AFS_SERVER_CONN_LIST_SIZE 2
- struct rxrpc_connection *fs_conn[AFS_SERVER_CONN_LIST_SIZE]; /* FS connections */
- unsigned fs_conn_cnt[AFS_SERVER_CONN_LIST_SIZE]; /* per conn call count */
- struct list_head fs_callq; /* queue of processes waiting to make a call */
- spinlock_t fs_lock; /* access lock */
- int fs_state; /* 0 or reason FS currently marked dead (-errno) */
- unsigned fs_rtt; /* FS round trip time */
- unsigned long fs_act_jif; /* time at which last activity occurred */
- unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
-
- /* callback promise management */
- struct list_head cb_promises; /* as yet unbroken promises from this server */
- spinlock_t cb_lock; /* access lock */
-};
-
-extern int afs_server_lookup(struct afs_cell *, const struct in_addr *,
- struct afs_server **);
-
-#define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
-
-extern void afs_put_server(struct afs_server *);
-extern void afs_server_do_timeout(struct afs_server *);
-
-extern int afs_server_find_by_peer(const struct rxrpc_peer *,
- struct afs_server **);
-
-extern int afs_server_get_vlconn(struct afs_server *,
- struct rxrpc_connection **);
-
-static inline
-struct afs_server *afs_server_get_from_peer(struct rxrpc_peer *peer)
-{
- struct afs_server *server;
-
- spin_lock(&afs_server_peer_lock);
- server = peer->user;
- if (server)
- afs_get_server(server);
- spin_unlock(&afs_server_peer_lock);
-
- return server;
-}
-
-/*
- * AFS server callslot grant record
- */
-struct afs_server_callslot {
- struct list_head link; /* link in server's list */
- struct task_struct *task; /* process waiting to make call */
- struct rxrpc_connection *conn; /* connection to use (or NULL on error) */
- short nconn; /* connection slot number (-1 on error) */
- char ready; /* T when ready */
- int errno; /* error number if nconn==-1 */
-};
-
-extern int afs_server_request_callslot(struct afs_server *,
- struct afs_server_callslot *);
-
-extern void afs_server_release_callslot(struct afs_server *,
- struct afs_server_callslot *);
-
-#endif /* AFS_SERVER_H */
/* AFS superblock handling
*
- * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
*
* This software may be freely redistributed under the terms of the
* GNU General Public License.
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include "vnode.h"
-#include "volume.h"
-#include "cell.h"
-#include "cmservice.h"
-#include "fsclient.h"
-#include "super.h"
#include "internal.h"
#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
.drop_inode = generic_delete_inode,
.destroy_inode = afs_destroy_inode,
.clear_inode = afs_clear_inode,
+ .umount_begin = afs_umount_begin,
.put_super = afs_put_super,
};
_enter("");
- afs_timer_init(&afs_mntpt_expiry_timer, &afs_mntpt_expiry_timer_ops);
-
/* create ourselves an inode cache */
atomic_set(&afs_count_active_inodes, 0);
ret = register_filesystem(&afs_fs_type);
if (ret < 0) {
kmem_cache_destroy(afs_inode_cachep);
- kleave(" = %d", ret);
+ _leave(" = %d", ret);
return ret;
}
- kleave(" = 0");
+ _leave(" = 0");
return 0;
}
*/
void __exit afs_fs_exit(void)
{
+ _enter("");
+
+ afs_mntpt_kill_timer();
unregister_filesystem(&afs_fs_type);
if (atomic_read(&afs_count_active_inodes) != 0) {
}
kmem_cache_destroy(afs_inode_cachep);
+ _leave("");
}
/*
* shamelessly adapted it from the msdos fs
*/
static int afs_super_parse_options(struct afs_mount_params *params,
- char *options,
- const char **devname)
+ char *options, const char **devname)
{
+ struct afs_cell *cell;
char *key, *value;
int ret;
options[PAGE_SIZE - 1] = 0;
ret = 0;
- while ((key = strsep(&options, ",")) != 0)
- {
+ while ((key = strsep(&options, ","))) {
value = strchr(key, '=');
if (value)
*value++ = 0;
- printk("kAFS: KEY: %s, VAL:%s\n", key, value ?: "-");
+ _debug("kAFS: KEY: %s, VAL:%s", key, value ?: "-");
if (strcmp(key, "rwpath") == 0) {
if (!want_no_value(&value, "rwpath"))
return -EINVAL;
params->rwpath = 1;
- continue;
} else if (strcmp(key, "vol") == 0) {
if (!want_arg(&value, "vol"))
return -EINVAL;
*devname = value;
- continue;
} else if (strcmp(key, "cell") == 0) {
if (!want_arg(&value, "cell"))
return -EINVAL;
+ cell = afs_cell_lookup(value, strlen(value));
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
afs_put_cell(params->default_cell);
- ret = afs_cell_lookup(value,
- strlen(value),
- ¶ms->default_cell);
- if (ret < 0)
- return -EINVAL;
- continue;
+ params->default_cell = cell;
+ } else {
+ printk("kAFS: Unknown mount option: '%s'\n", key);
+ ret = -EINVAL;
+ goto error;
}
-
- printk("kAFS: Unknown mount option: '%s'\n", key);
- ret = -EINVAL;
- goto error;
}
ret = 0;
-
error:
_leave(" = %d", ret);
return ret;
struct inode *inode = NULL;
int ret;
- kenter("");
+ _enter("");
/* allocate a superblock info record */
as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
fid.vid = as->volume->vid;
fid.vnode = 1;
fid.unique = 1;
- ret = afs_iget(sb, &fid, &inode);
- if (ret < 0)
- goto error;
+ inode = afs_iget(sb, &fid);
+ if (IS_ERR(inode))
+ goto error_inode;
ret = -ENOMEM;
root = d_alloc_root(inode);
sb->s_root = root;
- kleave(" = 0");
+ _leave(" = 0");
return 0;
+error_inode:
+ ret = PTR_ERR(inode);
+ inode = NULL;
error:
iput(inode);
afs_put_volume(as->volume);
sb->s_fs_info = NULL;
- kleave(" = %d", ret);
+ _leave(" = %d", ret);
return ret;
}
{
struct afs_mount_params params;
struct super_block *sb;
+ struct afs_volume *vol;
int ret;
_enter(",,%s,%p", dev_name, options);
memset(¶ms, 0, sizeof(params));
- /* start the cache manager */
- ret = afscm_start();
- if (ret < 0) {
- _leave(" = %d", ret);
- return ret;
- }
-
/* parse the options */
if (options) {
ret = afs_super_parse_options(¶ms, options, &dev_name);
}
/* parse the device name */
- ret = afs_volume_lookup(dev_name,
- params.default_cell,
- params.rwpath,
- ¶ms.volume);
- if (ret < 0)
+ vol = afs_volume_lookup(dev_name, params.default_cell, params.rwpath);
+ if (IS_ERR(vol)) {
+ ret = PTR_ERR(vol);
goto error;
+ }
+
+ params.volume = vol;
/* allocate a deviceless superblock */
sb = sget(fs_type, afs_test_super, set_anon_super, ¶ms);
- if (IS_ERR(sb))
+ if (IS_ERR(sb)) {
+ ret = PTR_ERR(sb);
goto error;
+ }
sb->s_flags = flags;
afs_put_volume(params.volume);
afs_put_cell(params.default_cell);
- _leave(" = 0 [%p]", 0, sb);
+ _leave(" = 0 [%p]", sb);
return 0;
error:
afs_put_volume(params.volume);
afs_put_cell(params.default_cell);
- afscm_stop();
_leave(" = %d", ret);
return ret;
}
_enter("");
afs_put_volume(as->volume);
- afscm_stop();
_leave("");
}
inode_init_once(&vnode->vfs_inode);
init_waitqueue_head(&vnode->update_waitq);
spin_lock_init(&vnode->lock);
- INIT_LIST_HEAD(&vnode->cb_link);
- INIT_LIST_HEAD(&vnode->cb_hash_link);
- afs_timer_init(&vnode->cb_timeout,
- &afs_vnode_cb_timed_out_ops);
+ INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
+ mutex_init(&vnode->cb_broken_lock);
}
}
vnode->volume = NULL;
vnode->update_cnt = 0;
vnode->flags = 0;
+ vnode->cb_promised = false;
return &vnode->vfs_inode;
}
*/
static void afs_destroy_inode(struct inode *inode)
{
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+
_enter("{%lu}", inode->i_ino);
- kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
+ _debug("DESTROY INODE %p", inode);
+
+ ASSERTCMP(vnode->server, ==, NULL);
+
+ kmem_cache_free(afs_inode_cachep, vnode);
atomic_dec(&afs_count_active_inodes);
}
+++ /dev/null
-/* AFS filesystem internal private data
- *
- * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
- *
- * This software may be freely redistributed under the terms of the
- * GNU General Public License.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * Authors: David Woodhouse <dwmw2@cambridge.redhat.com>
- * David Howells <dhowells@redhat.com>
- *
- */
-
-#ifndef AFS_SUPER_H
-#define AFS_SUPER_H
-
-#include <linux/fs.h>
-#include "server.h"
-
-/*
- * AFS superblock private data
- * - there's one superblock per volume
- */
-struct afs_super_info {
- struct afs_volume *volume; /* volume record */
- char rwparent; /* T if parent is R/W AFS volume */
-};
-
-static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-extern struct file_system_type afs_fs_type;
-
-#endif /* AFS_SUPER_H */
+++ /dev/null
-/* AFS transport management
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_TRANSPORT_H
-#define AFS_TRANSPORT_H
-
-#include "types.h"
-#include <rxrpc/transport.h>
-
-/* the cache manager transport endpoint */
-extern struct rxrpc_transport *afs_transport;
-
-#endif /* AFS_TRANSPORT_H */
#include <linux/init.h>
#include <linux/sched.h>
-#include <rxrpc/rxrpc.h>
-#include <rxrpc/transport.h>
-#include <rxrpc/connection.h>
-#include <rxrpc/call.h>
-#include "server.h"
-#include "volume.h"
-#include "vlclient.h"
-#include "kafsasyncd.h"
-#include "kafstimod.h"
-#include "errors.h"
#include "internal.h"
-#define VLGETENTRYBYID 503 /* AFS Get Cache Entry By ID operation ID */
-#define VLGETENTRYBYNAME 504 /* AFS Get Cache Entry By Name operation ID */
-#define VLPROBE 514 /* AFS Probe Volume Location Service operation ID */
-
-static void afs_rxvl_get_entry_by_id_attn(struct rxrpc_call *call);
-static void afs_rxvl_get_entry_by_id_error(struct rxrpc_call *call);
-
/*
- * map afs VL abort codes to/from Linux error codes
- * - called with call->lock held
+ * map volume locator abort codes to error codes
*/
-static void afs_rxvl_aemap(struct rxrpc_call *call)
+static int afs_vl_abort_to_error(u32 abort_code)
{
- int err;
-
- _enter("{%u,%u,%d}",
- call->app_err_state, call->app_abort_code, call->app_errno);
-
- switch (call->app_err_state) {
- case RXRPC_ESTATE_LOCAL_ABORT:
- call->app_abort_code = -call->app_errno;
- return;
-
- case RXRPC_ESTATE_PEER_ABORT:
- switch (call->app_abort_code) {
- case AFSVL_IDEXIST: err = -EEXIST; break;
- case AFSVL_IO: err = -EREMOTEIO; break;
- case AFSVL_NAMEEXIST: err = -EEXIST; break;
- case AFSVL_CREATEFAIL: err = -EREMOTEIO; break;
- case AFSVL_NOENT: err = -ENOMEDIUM; break;
- case AFSVL_EMPTY: err = -ENOMEDIUM; break;
- case AFSVL_ENTDELETED: err = -ENOMEDIUM; break;
- case AFSVL_BADNAME: err = -EINVAL; break;
- case AFSVL_BADINDEX: err = -EINVAL; break;
- case AFSVL_BADVOLTYPE: err = -EINVAL; break;
- case AFSVL_BADSERVER: err = -EINVAL; break;
- case AFSVL_BADPARTITION: err = -EINVAL; break;
- case AFSVL_REPSFULL: err = -EFBIG; break;
- case AFSVL_NOREPSERVER: err = -ENOENT; break;
- case AFSVL_DUPREPSERVER: err = -EEXIST; break;
- case AFSVL_RWNOTFOUND: err = -ENOENT; break;
- case AFSVL_BADREFCOUNT: err = -EINVAL; break;
- case AFSVL_SIZEEXCEEDED: err = -EINVAL; break;
- case AFSVL_BADENTRY: err = -EINVAL; break;
- case AFSVL_BADVOLIDBUMP: err = -EINVAL; break;
- case AFSVL_IDALREADYHASHED: err = -EINVAL; break;
- case AFSVL_ENTRYLOCKED: err = -EBUSY; break;
- case AFSVL_BADVOLOPER: err = -EBADRQC; break;
- case AFSVL_BADRELLOCKTYPE: err = -EINVAL; break;
- case AFSVL_RERELEASE: err = -EREMOTEIO; break;
- case AFSVL_BADSERVERFLAG: err = -EINVAL; break;
- case AFSVL_PERM: err = -EACCES; break;
- case AFSVL_NOMEM: err = -EREMOTEIO; break;
- default:
- err = afs_abort_to_error(call->app_abort_code);
- break;
- }
- call->app_errno = err;
- return;
-
+ _enter("%u", abort_code);
+
+ switch (abort_code) {
+ case AFSVL_IDEXIST: return -EEXIST;
+ case AFSVL_IO: return -EREMOTEIO;
+ case AFSVL_NAMEEXIST: return -EEXIST;
+ case AFSVL_CREATEFAIL: return -EREMOTEIO;
+ case AFSVL_NOENT: return -ENOMEDIUM;
+ case AFSVL_EMPTY: return -ENOMEDIUM;
+ case AFSVL_ENTDELETED: return -ENOMEDIUM;
+ case AFSVL_BADNAME: return -EINVAL;
+ case AFSVL_BADINDEX: return -EINVAL;
+ case AFSVL_BADVOLTYPE: return -EINVAL;
+ case AFSVL_BADSERVER: return -EINVAL;
+ case AFSVL_BADPARTITION: return -EINVAL;
+ case AFSVL_REPSFULL: return -EFBIG;
+ case AFSVL_NOREPSERVER: return -ENOENT;
+ case AFSVL_DUPREPSERVER: return -EEXIST;
+ case AFSVL_RWNOTFOUND: return -ENOENT;
+ case AFSVL_BADREFCOUNT: return -EINVAL;
+ case AFSVL_SIZEEXCEEDED: return -EINVAL;
+ case AFSVL_BADENTRY: return -EINVAL;
+ case AFSVL_BADVOLIDBUMP: return -EINVAL;
+ case AFSVL_IDALREADYHASHED: return -EINVAL;
+ case AFSVL_ENTRYLOCKED: return -EBUSY;
+ case AFSVL_BADVOLOPER: return -EBADRQC;
+ case AFSVL_BADRELLOCKTYPE: return -EINVAL;
+ case AFSVL_RERELEASE: return -EREMOTEIO;
+ case AFSVL_BADSERVERFLAG: return -EINVAL;
+ case AFSVL_PERM: return -EACCES;
+ case AFSVL_NOMEM: return -EREMOTEIO;
default:
- return;
+ return afs_abort_to_error(abort_code);
}
}
-#if 0
/*
- * probe a volume location server to see if it is still alive -- unused
+ * deliver reply data to a VL.GetEntryByXXX call
*/
-static int afs_rxvl_probe(struct afs_server *server, int alloc_flags)
+static int afs_deliver_vl_get_entry_by_xxx(struct afs_call *call,
+ struct sk_buff *skb, bool last)
{
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[1];
- size_t sent;
- int ret;
- __be32 param[1];
-
- DECLARE_WAITQUEUE(myself, current);
-
- /* get hold of the vlserver connection */
- ret = afs_server_get_vlconn(server, &conn);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(conn, NULL, NULL, afs_rxvl_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = VLPROBE;
-
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
-
- /* marshall the parameters */
- param[0] = htonl(VLPROBE);
- piov[0].iov_len = sizeof(param);
- piov[0].iov_base = param;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET,
- alloc_flags, 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (call->app_call_state != RXRPC_CSTATE_CLNT_RCV_REPLY ||
- signal_pending(current))
- break;
- schedule();
- }
- set_current_state(TASK_RUNNING);
-
- ret = -EINTR;
- if (signal_pending(current))
- goto abort;
-
- switch (call->app_call_state) {
- case RXRPC_CSTATE_ERROR:
- ret = call->app_errno;
- goto out_unwait;
-
- case RXRPC_CSTATE_CLNT_GOT_REPLY:
- ret = 0;
- goto out_unwait;
-
- default:
- BUG();
- }
+ struct afs_cache_vlocation *entry;
+ __be32 *bp;
+ u32 tmp;
+ int loop;
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- rxrpc_put_connection(conn);
-out:
- return ret;
-}
-#endif
+ _enter(",,%u", last);
-/*
- * look up a volume location database entry by name
- */
-int afs_rxvl_get_entry_by_name(struct afs_server *server,
- const char *volname,
- unsigned volnamesz,
- struct afs_cache_vlocation *entry)
-{
- DECLARE_WAITQUEUE(myself, current);
-
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[3];
- unsigned tmp;
- size_t sent;
- int ret, loop;
- __be32 *bp, param[2], zero;
-
- _enter(",%*.*s,%u,", volnamesz, volnamesz, volname, volnamesz);
-
- memset(entry, 0, sizeof(*entry));
-
- /* get hold of the vlserver connection */
- ret = afs_server_get_vlconn(server, &conn);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(conn, NULL, NULL, afs_rxvl_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = VLGETENTRYBYNAME;
+ afs_transfer_reply(call, skb);
+ if (!last)
+ return 0;
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
+ if (call->reply_size != call->reply_max)
+ return -EBADMSG;
- /* marshall the parameters */
- piov[1].iov_len = volnamesz;
- piov[1].iov_base = (char *) volname;
-
- zero = 0;
- piov[2].iov_len = (4 - (piov[1].iov_len & 3)) & 3;
- piov[2].iov_base = &zero;
-
- param[0] = htonl(VLGETENTRYBYNAME);
- param[1] = htonl(piov[1].iov_len);
-
- piov[0].iov_len = sizeof(param);
- piov[0].iov_base = param;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 3, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- bp = rxrpc_call_alloc_scratch(call, 384);
-
- ret = rxrpc_call_read_data(call, bp, 384,
- RXRPC_CALL_READ_BLOCK |
- RXRPC_CALL_READ_ALL);
- if (ret < 0) {
- if (ret == -ECONNABORTED) {
- ret = call->app_errno;
- goto out_unwait;
- }
- goto abort;
- }
+ /* unmarshall the reply once we've received all of it */
+ entry = call->reply;
+ bp = call->buffer;
- /* unmarshall the reply */
for (loop = 0; loop < 64; loop++)
entry->name[loop] = ntohl(*bp++);
+ entry->name[loop] = 0;
bp++; /* final NUL */
bp++; /* type */
for (loop = 0; loop < 8; loop++) {
tmp = ntohl(*bp++);
+ entry->srvtmask[loop] = 0;
if (tmp & AFS_VLSF_RWVOL)
entry->srvtmask[loop] |= AFS_VOL_VTM_RW;
if (tmp & AFS_VLSF_ROVOL)
bp++; /* clone ID */
tmp = ntohl(*bp++); /* flags */
+ entry->vidmask = 0;
if (tmp & AFS_VLF_RWEXISTS)
entry->vidmask |= AFS_VOL_VTM_RW;
if (tmp & AFS_VLF_ROEXISTS)
entry->vidmask |= AFS_VOL_VTM_RO;
if (tmp & AFS_VLF_BACKEXISTS)
entry->vidmask |= AFS_VOL_VTM_BAK;
-
- ret = -ENOMEDIUM;
if (!entry->vidmask)
- goto abort;
-
- /* success */
- entry->rtime = get_seconds();
- ret = 0;
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- rxrpc_put_connection(conn);
-out:
- _leave(" = %d", ret);
- return ret;
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
+ return -EBADMSG;
+
+ _leave(" = 0 [done]");
+ return 0;
}
/*
- * look up a volume location database entry by ID
+ * VL.GetEntryByName operation type
*/
-int afs_rxvl_get_entry_by_id(struct afs_server *server,
- afs_volid_t volid,
- afs_voltype_t voltype,
- struct afs_cache_vlocation *entry)
-{
- DECLARE_WAITQUEUE(myself, current);
-
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[1];
- unsigned tmp;
- size_t sent;
- int ret, loop;
- __be32 *bp, param[3];
-
- _enter(",%x,%d,", volid, voltype);
-
- memset(entry, 0, sizeof(*entry));
-
- /* get hold of the vlserver connection */
- ret = afs_server_get_vlconn(server, &conn);
- if (ret < 0)
- goto out;
-
- /* create a call through that connection */
- ret = rxrpc_create_call(conn, NULL, NULL, afs_rxvl_aemap, &call);
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- goto out_put_conn;
- }
- call->app_opcode = VLGETENTRYBYID;
-
- /* we want to get event notifications from the call */
- add_wait_queue(&call->waitq, &myself);
-
- /* marshall the parameters */
- param[0] = htonl(VLGETENTRYBYID);
- param[1] = htonl(volid);
- param[2] = htonl(voltype);
-
- piov[0].iov_len = sizeof(param);
- piov[0].iov_base = param;
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0)
- goto abort;
-
- /* wait for the reply to completely arrive */
- bp = rxrpc_call_alloc_scratch(call, 384);
-
- ret = rxrpc_call_read_data(call, bp, 384,
- RXRPC_CALL_READ_BLOCK |
- RXRPC_CALL_READ_ALL);
- if (ret < 0) {
- if (ret == -ECONNABORTED) {
- ret = call->app_errno;
- goto out_unwait;
- }
- goto abort;
- }
-
- /* unmarshall the reply */
- for (loop = 0; loop < 64; loop++)
- entry->name[loop] = ntohl(*bp++);
- bp++; /* final NUL */
-
- bp++; /* type */
- entry->nservers = ntohl(*bp++);
-
- for (loop = 0; loop < 8; loop++)
- entry->servers[loop].s_addr = *bp++;
-
- bp += 8; /* partition IDs */
-
- for (loop = 0; loop < 8; loop++) {
- tmp = ntohl(*bp++);
- if (tmp & AFS_VLSF_RWVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_RW;
- if (tmp & AFS_VLSF_ROVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_RO;
- if (tmp & AFS_VLSF_BACKVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_BAK;
- }
-
- entry->vid[0] = ntohl(*bp++);
- entry->vid[1] = ntohl(*bp++);
- entry->vid[2] = ntohl(*bp++);
-
- bp++; /* clone ID */
-
- tmp = ntohl(*bp++); /* flags */
- if (tmp & AFS_VLF_RWEXISTS)
- entry->vidmask |= AFS_VOL_VTM_RW;
- if (tmp & AFS_VLF_ROEXISTS)
- entry->vidmask |= AFS_VOL_VTM_RO;
- if (tmp & AFS_VLF_BACKEXISTS)
- entry->vidmask |= AFS_VOL_VTM_BAK;
+static const struct afs_call_type afs_RXVLGetEntryByName = {
+ .deliver = afs_deliver_vl_get_entry_by_xxx,
+ .abort_to_error = afs_vl_abort_to_error,
+ .destructor = afs_flat_call_destructor,
+};
- ret = -ENOMEDIUM;
- if (!entry->vidmask)
- goto abort;
-
-#if 0 /* TODO: remove */
- entry->nservers = 3;
- entry->servers[0].s_addr = htonl(0xac101249);
- entry->servers[1].s_addr = htonl(0xac101243);
- entry->servers[2].s_addr = htonl(0xac10125b /*0xac10125b*/);
-
- entry->srvtmask[0] = AFS_VOL_VTM_RO;
- entry->srvtmask[1] = AFS_VOL_VTM_RO;
- entry->srvtmask[2] = AFS_VOL_VTM_RO | AFS_VOL_VTM_RW;
-#endif
-
- /* success */
- entry->rtime = get_seconds();
- ret = 0;
-
-out_unwait:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&call->waitq, &myself);
- rxrpc_put_call(call);
-out_put_conn:
- rxrpc_put_connection(conn);
-out:
- _leave(" = %d", ret);
- return ret;
-
-abort:
- set_current_state(TASK_UNINTERRUPTIBLE);
- rxrpc_call_abort(call, ret);
- schedule();
- goto out_unwait;
-}
+/*
+ * VL.GetEntryById operation type
+ */
+static const struct afs_call_type afs_RXVLGetEntryById = {
+ .deliver = afs_deliver_vl_get_entry_by_xxx,
+ .abort_to_error = afs_vl_abort_to_error,
+ .destructor = afs_flat_call_destructor,
+};
/*
- * look up a volume location database entry by ID asynchronously
+ * dispatch a get volume entry by name operation
*/
-int afs_rxvl_get_entry_by_id_async(struct afs_async_op *op,
- afs_volid_t volid,
- afs_voltype_t voltype)
+int afs_vl_get_entry_by_name(struct in_addr *addr,
+ const char *volname,
+ struct afs_cache_vlocation *entry,
+ const struct afs_wait_mode *wait_mode)
{
- struct rxrpc_connection *conn;
- struct rxrpc_call *call;
- struct kvec piov[1];
- size_t sent;
- int ret;
- __be32 param[3];
-
- _enter(",%x,%d,", volid, voltype);
-
- /* get hold of the vlserver connection */
- ret = afs_server_get_vlconn(op->server, &conn);
- if (ret < 0) {
- _leave(" = %d", ret);
- return ret;
- }
+ struct afs_call *call;
+ size_t volnamesz, reqsz, padsz;
+ __be32 *bp;
- /* create a call through that connection */
- ret = rxrpc_create_call(conn,
- afs_rxvl_get_entry_by_id_attn,
- afs_rxvl_get_entry_by_id_error,
- afs_rxvl_aemap,
- &op->call);
- rxrpc_put_connection(conn);
-
- if (ret < 0) {
- printk("kAFS: Unable to create call: %d\n", ret);
- _leave(" = %d", ret);
- return ret;
- }
+ _enter("");
- op->call->app_opcode = VLGETENTRYBYID;
- op->call->app_user = op;
+ volnamesz = strlen(volname);
+ padsz = (4 - (volnamesz & 3)) & 3;
+ reqsz = 8 + volnamesz + padsz;
- call = op->call;
- rxrpc_get_call(call);
+ call = afs_alloc_flat_call(&afs_RXVLGetEntryByName, reqsz, 384);
+ if (!call)
+ return -ENOMEM;
- /* send event notifications from the call to kafsasyncd */
- afs_kafsasyncd_begin_op(op);
+ call->reply = entry;
+ call->service_id = VL_SERVICE;
+ call->port = htons(AFS_VL_PORT);
/* marshall the parameters */
- param[0] = htonl(VLGETENTRYBYID);
- param[1] = htonl(volid);
- param[2] = htonl(voltype);
-
- piov[0].iov_len = sizeof(param);
- piov[0].iov_base = param;
-
- /* allocate result read buffer in scratch space */
- call->app_scr_ptr = rxrpc_call_alloc_scratch(op->call, 384);
-
- /* send the parameters to the server */
- ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS,
- 0, &sent);
- if (ret < 0) {
- rxrpc_call_abort(call, ret); /* handle from kafsasyncd */
- ret = 0;
- goto out;
- }
-
- /* wait for the reply to completely arrive */
- ret = rxrpc_call_read_data(call, call->app_scr_ptr, 384, 0);
- switch (ret) {
- case 0:
- case -EAGAIN:
- case -ECONNABORTED:
- ret = 0;
- break; /* all handled by kafsasyncd */
-
- default:
- rxrpc_call_abort(call, ret); /* make kafsasyncd handle it */
- ret = 0;
- break;
- }
-
-out:
- rxrpc_put_call(call);
- _leave(" = %d", ret);
- return ret;
+ bp = call->request;
+ *bp++ = htonl(VLGETENTRYBYNAME);
+ *bp++ = htonl(volnamesz);
+ memcpy(bp, volname, volnamesz);
+ if (padsz > 0)
+ memset((void *) bp + volnamesz, 0, padsz);
+
+ /* initiate the call */
+ return afs_make_call(addr, call, GFP_KERNEL, wait_mode);
}
/*
- * attend to the asynchronous get VLDB entry by ID
+ * dispatch a get volume entry by ID operation
*/
-int afs_rxvl_get_entry_by_id_async2(struct afs_async_op *op,
- struct afs_cache_vlocation *entry)
+int afs_vl_get_entry_by_id(struct in_addr *addr,
+ afs_volid_t volid,
+ afs_voltype_t voltype,
+ struct afs_cache_vlocation *entry,
+ const struct afs_wait_mode *wait_mode)
{
+ struct afs_call *call;
__be32 *bp;
- __u32 tmp;
- int loop, ret;
-
- _enter("{op=%p cst=%u}", op, op->call->app_call_state);
-
- memset(entry, 0, sizeof(*entry));
-
- if (op->call->app_call_state == RXRPC_CSTATE_COMPLETE) {
- /* operation finished */
- afs_kafsasyncd_terminate_op(op);
-
- bp = op->call->app_scr_ptr;
-
- /* unmarshall the reply */
- for (loop = 0; loop < 64; loop++)
- entry->name[loop] = ntohl(*bp++);
- bp++; /* final NUL */
-
- bp++; /* type */
- entry->nservers = ntohl(*bp++);
-
- for (loop = 0; loop < 8; loop++)
- entry->servers[loop].s_addr = *bp++;
-
- bp += 8; /* partition IDs */
-
- for (loop = 0; loop < 8; loop++) {
- tmp = ntohl(*bp++);
- if (tmp & AFS_VLSF_RWVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_RW;
- if (tmp & AFS_VLSF_ROVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_RO;
- if (tmp & AFS_VLSF_BACKVOL)
- entry->srvtmask[loop] |= AFS_VOL_VTM_BAK;
- }
-
- entry->vid[0] = ntohl(*bp++);
- entry->vid[1] = ntohl(*bp++);
- entry->vid[2] = ntohl(*bp++);
-
- bp++; /* clone ID */
-
- tmp = ntohl(*bp++); /* flags */
- if (tmp & AFS_VLF_RWEXISTS)
- entry->vidmask |= AFS_VOL_VTM_RW;
- if (tmp & AFS_VLF_ROEXISTS)
- entry->vidmask |= AFS_VOL_VTM_RO;
- if (tmp & AFS_VLF_BACKEXISTS)
- entry->vidmask |= AFS_VOL_VTM_BAK;
-
- ret = -ENOMEDIUM;
- if (!entry->vidmask) {
- rxrpc_call_abort(op->call, ret);
- goto done;
- }
-
-#if 0 /* TODO: remove */
- entry->nservers = 3;
- entry->servers[0].s_addr = htonl(0xac101249);
- entry->servers[1].s_addr = htonl(0xac101243);
- entry->servers[2].s_addr = htonl(0xac10125b /*0xac10125b*/);
-
- entry->srvtmask[0] = AFS_VOL_VTM_RO;
- entry->srvtmask[1] = AFS_VOL_VTM_RO;
- entry->srvtmask[2] = AFS_VOL_VTM_RO | AFS_VOL_VTM_RW;
-#endif
-
- /* success */
- entry->rtime = get_seconds();
- ret = 0;
- goto done;
- }
-
- if (op->call->app_call_state == RXRPC_CSTATE_ERROR) {
- /* operation error */
- ret = op->call->app_errno;
- goto done;
- }
-
- _leave(" = -EAGAIN");
- return -EAGAIN;
-
-done:
- rxrpc_put_call(op->call);
- op->call = NULL;
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * handle attention events on an async get-entry-by-ID op
- * - called from krxiod
- */
-static void afs_rxvl_get_entry_by_id_attn(struct rxrpc_call *call)
-{
- struct afs_async_op *op = call->app_user;
-
- _enter("{op=%p cst=%u}", op, call->app_call_state);
-
- switch (call->app_call_state) {
- case RXRPC_CSTATE_COMPLETE:
- afs_kafsasyncd_attend_op(op);
- break;
- case RXRPC_CSTATE_CLNT_RCV_REPLY:
- if (call->app_async_read)
- break;
- case RXRPC_CSTATE_CLNT_GOT_REPLY:
- if (call->app_read_count == 0)
- break;
- printk("kAFS: Reply bigger than expected"
- " {cst=%u asyn=%d mark=%Zu rdy=%Zu pr=%u%s}",
- call->app_call_state,
- call->app_async_read,
- call->app_mark,
- call->app_ready_qty,
- call->pkt_rcv_count,
- call->app_last_rcv ? " last" : "");
-
- rxrpc_call_abort(call, -EBADMSG);
- break;
- default:
- BUG();
- }
- _leave("");
-}
+ _enter("");
-/*
- * handle error events on an async get-entry-by-ID op
- * - called from krxiod
- */
-static void afs_rxvl_get_entry_by_id_error(struct rxrpc_call *call)
-{
- struct afs_async_op *op = call->app_user;
+ call = afs_alloc_flat_call(&afs_RXVLGetEntryById, 12, 384);
+ if (!call)
+ return -ENOMEM;
- _enter("{op=%p cst=%u}", op, call->app_call_state);
+ call->reply = entry;
+ call->service_id = VL_SERVICE;
+ call->port = htons(AFS_VL_PORT);
- afs_kafsasyncd_attend_op(op);
+ /* marshall the parameters */
+ bp = call->request;
+ *bp++ = htonl(VLGETENTRYBYID);
+ *bp++ = htonl(volid);
+ *bp = htonl(voltype);
- _leave("");
+ /* initiate the call */
+ return afs_make_call(addr, call, GFP_KERNEL, wait_mode);
}
-/* volume location management
+/* AFS volume location management
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/pagemap.h>
-#include "volume.h"
-#include "cell.h"
-#include "cmservice.h"
-#include "fsclient.h"
-#include "vlclient.h"
-#include "kafstimod.h"
-#include <rxrpc/connection.h>
#include "internal.h"
-#define AFS_VLDB_TIMEOUT HZ*1000
+unsigned afs_vlocation_timeout = 10; /* volume location timeout in seconds */
+unsigned afs_vlocation_update_timeout = 10 * 60;
-static void afs_vlocation_update_timer(struct afs_timer *timer);
-static void afs_vlocation_update_attend(struct afs_async_op *op);
-static void afs_vlocation_update_discard(struct afs_async_op *op);
-static void __afs_put_vlocation(struct afs_vlocation *vlocation);
+static void afs_vlocation_reaper(struct work_struct *);
+static void afs_vlocation_updater(struct work_struct *);
-static void __afs_vlocation_timeout(struct afs_timer *timer)
-{
- struct afs_vlocation *vlocation =
- list_entry(timer, struct afs_vlocation, timeout);
-
- _debug("VL TIMEOUT [%s{u=%d}]",
- vlocation->vldb.name, atomic_read(&vlocation->usage));
-
- afs_vlocation_do_timeout(vlocation);
-}
-
-static const struct afs_timer_ops afs_vlocation_timer_ops = {
- .timed_out = __afs_vlocation_timeout,
-};
-
-static const struct afs_timer_ops afs_vlocation_update_timer_ops = {
- .timed_out = afs_vlocation_update_timer,
-};
-
-static const struct afs_async_op_ops afs_vlocation_update_op_ops = {
- .attend = afs_vlocation_update_attend,
- .discard = afs_vlocation_update_discard,
-};
-
-static LIST_HEAD(afs_vlocation_update_pendq); /* queue of VLs awaiting update */
-static struct afs_vlocation *afs_vlocation_update; /* VL currently being updated */
-static DEFINE_SPINLOCK(afs_vlocation_update_lock); /* lock guarding update queue */
-
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_vlocation_cache_match(void *target,
- const void *entry);
-static void afs_vlocation_cache_update(void *source, void *entry);
-
-struct cachefs_index_def afs_vlocation_cache_index_def = {
- .name = "vldb",
- .data_size = sizeof(struct afs_cache_vlocation),
- .keys[0] = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
- .match = afs_vlocation_cache_match,
- .update = afs_vlocation_cache_update,
-};
-#endif
+static LIST_HEAD(afs_vlocation_updates);
+static LIST_HEAD(afs_vlocation_graveyard);
+static DEFINE_SPINLOCK(afs_vlocation_updates_lock);
+static DEFINE_SPINLOCK(afs_vlocation_graveyard_lock);
+static DECLARE_DELAYED_WORK(afs_vlocation_reap, afs_vlocation_reaper);
+static DECLARE_DELAYED_WORK(afs_vlocation_update, afs_vlocation_updater);
+static struct workqueue_struct *afs_vlocation_update_worker;
/*
* iterate through the VL servers in a cell until one of them admits knowing
* about the volume in question
- * - caller must have cell->vl_sem write-locked
*/
-static int afs_vlocation_access_vl_by_name(struct afs_vlocation *vlocation,
- const char *name,
- unsigned namesz,
+static int afs_vlocation_access_vl_by_name(struct afs_vlocation *vl,
struct afs_cache_vlocation *vldb)
{
- struct afs_server *server = NULL;
- struct afs_cell *cell = vlocation->cell;
+ struct afs_cell *cell = vl->cell;
+ struct in_addr addr;
int count, ret;
- _enter("%s,%*.*s,%u", cell->name, namesz, namesz, name, namesz);
+ _enter("%s,%s", cell->name, vl->vldb.name);
+ down_write(&vl->cell->vl_sem);
ret = -ENOMEDIUM;
for (count = cell->vl_naddrs; count > 0; count--) {
- _debug("CellServ[%hu]: %08x",
- cell->vl_curr_svix,
- cell->vl_addrs[cell->vl_curr_svix].s_addr);
-
- /* try and create a server */
- ret = afs_server_lookup(cell,
- &cell->vl_addrs[cell->vl_curr_svix],
- &server);
- switch (ret) {
- case 0:
- break;
- case -ENOMEM:
- case -ENONET:
- goto out;
- default:
- goto rotate;
- }
+ addr = cell->vl_addrs[cell->vl_curr_svix];
+
+ _debug("CellServ[%hu]: %08x", cell->vl_curr_svix, addr.s_addr);
/* attempt to access the VL server */
- ret = afs_rxvl_get_entry_by_name(server, name, namesz, vldb);
+ ret = afs_vl_get_entry_by_name(&addr, vl->vldb.name, vldb,
+ &afs_sync_call);
switch (ret) {
case 0:
- afs_put_server(server);
goto out;
case -ENOMEM:
case -ENONET:
case -ENETUNREACH:
case -EHOSTUNREACH:
case -ECONNREFUSED:
- down_write(&server->sem);
- if (server->vlserver) {
- rxrpc_put_connection(server->vlserver);
- server->vlserver = NULL;
- }
- up_write(&server->sem);
- afs_put_server(server);
if (ret == -ENOMEM || ret == -ENONET)
goto out;
goto rotate;
case -ENOMEDIUM:
- afs_put_server(server);
goto out;
default:
- afs_put_server(server);
- ret = -ENOMEDIUM;
+ ret = -EIO;
goto rotate;
}
}
out:
+ up_write(&vl->cell->vl_sem);
_leave(" = %d", ret);
return ret;
}
/*
* iterate through the VL servers in a cell until one of them admits knowing
* about the volume in question
- * - caller must have cell->vl_sem write-locked
*/
-static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vlocation,
+static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vl,
afs_volid_t volid,
afs_voltype_t voltype,
struct afs_cache_vlocation *vldb)
{
- struct afs_server *server = NULL;
- struct afs_cell *cell = vlocation->cell;
+ struct afs_cell *cell = vl->cell;
+ struct in_addr addr;
int count, ret;
_enter("%s,%x,%d,", cell->name, volid, voltype);
+ down_write(&vl->cell->vl_sem);
ret = -ENOMEDIUM;
for (count = cell->vl_naddrs; count > 0; count--) {
- _debug("CellServ[%hu]: %08x",
- cell->vl_curr_svix,
- cell->vl_addrs[cell->vl_curr_svix].s_addr);
-
- /* try and create a server */
- ret = afs_server_lookup(cell,
- &cell->vl_addrs[cell->vl_curr_svix],
- &server);
- switch (ret) {
- case 0:
- break;
- case -ENOMEM:
- case -ENONET:
- goto out;
- default:
- goto rotate;
- }
+ addr = cell->vl_addrs[cell->vl_curr_svix];
+
+ _debug("CellServ[%hu]: %08x", cell->vl_curr_svix, addr.s_addr);
/* attempt to access the VL server */
- ret = afs_rxvl_get_entry_by_id(server, volid, voltype, vldb);
+ ret = afs_vl_get_entry_by_id(&addr, volid, voltype, vldb,
+ &afs_sync_call);
switch (ret) {
case 0:
- afs_put_server(server);
goto out;
case -ENOMEM:
case -ENONET:
case -ENETUNREACH:
case -EHOSTUNREACH:
case -ECONNREFUSED:
- down_write(&server->sem);
- if (server->vlserver) {
- rxrpc_put_connection(server->vlserver);
- server->vlserver = NULL;
- }
- up_write(&server->sem);
- afs_put_server(server);
if (ret == -ENOMEM || ret == -ENONET)
goto out;
goto rotate;
+ case -EBUSY:
+ vl->upd_busy_cnt++;
+ if (vl->upd_busy_cnt <= 3) {
+ if (vl->upd_busy_cnt > 1) {
+ /* second+ BUSY - sleep a little bit */
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(1);
+ __set_current_state(TASK_RUNNING);
+ }
+ continue;
+ }
+ break;
case -ENOMEDIUM:
- afs_put_server(server);
- goto out;
+ vl->upd_rej_cnt++;
+ goto rotate;
default:
- afs_put_server(server);
- ret = -ENOMEDIUM;
+ ret = -EIO;
goto rotate;
}
rotate:
cell->vl_curr_svix++;
cell->vl_curr_svix %= cell->vl_naddrs;
+ vl->upd_busy_cnt = 0;
}
out:
+ if (ret < 0 && vl->upd_rej_cnt > 0) {
+ printk(KERN_NOTICE "kAFS:"
+ " Active volume no longer valid '%s'\n",
+ vl->vldb.name);
+ vl->valid = 0;
+ ret = -ENOMEDIUM;
+ }
+
+ up_write(&vl->cell->vl_sem);
_leave(" = %d", ret);
return ret;
}
/*
- * lookup volume location
- * - caller must have cell->vol_sem write-locked
- * - iterate through the VL servers in a cell until one of them admits knowing
- * about the volume in question
- * - lookup in the local cache if not able to find on the VL server
- * - insert/update in the local cache if did get a VL response
+ * allocate a volume location record
*/
-int afs_vlocation_lookup(struct afs_cell *cell,
- const char *name,
- unsigned namesz,
- struct afs_vlocation **_vlocation)
+static struct afs_vlocation *afs_vlocation_alloc(struct afs_cell *cell,
+ const char *name,
+ size_t namesz)
{
- struct afs_cache_vlocation vldb;
- struct afs_vlocation *vlocation;
- afs_voltype_t voltype;
- afs_volid_t vid;
- int active = 0, ret;
-
- _enter("{%s},%*.*s,%u,", cell->name, namesz, namesz, name, namesz);
-
- if (namesz > sizeof(vlocation->vldb.name)) {
- _leave(" = -ENAMETOOLONG");
- return -ENAMETOOLONG;
- }
-
- /* search the cell's active list first */
- list_for_each_entry(vlocation, &cell->vl_list, link) {
- if (namesz < sizeof(vlocation->vldb.name) &&
- vlocation->vldb.name[namesz] != '\0')
- continue;
-
- if (memcmp(vlocation->vldb.name, name, namesz) == 0)
- goto found_in_memory;
- }
-
- /* search the cell's graveyard list second */
- spin_lock(&cell->vl_gylock);
- list_for_each_entry(vlocation, &cell->vl_graveyard, link) {
- if (namesz < sizeof(vlocation->vldb.name) &&
- vlocation->vldb.name[namesz] != '\0')
- continue;
-
- if (memcmp(vlocation->vldb.name, name, namesz) == 0)
- goto found_in_graveyard;
- }
- spin_unlock(&cell->vl_gylock);
-
- /* not in the cell's in-memory lists - create a new record */
- vlocation = kzalloc(sizeof(struct afs_vlocation), GFP_KERNEL);
- if (!vlocation)
- return -ENOMEM;
-
- atomic_set(&vlocation->usage, 1);
- INIT_LIST_HEAD(&vlocation->link);
- rwlock_init(&vlocation->lock);
- memcpy(vlocation->vldb.name, name, namesz);
-
- afs_timer_init(&vlocation->timeout, &afs_vlocation_timer_ops);
- afs_timer_init(&vlocation->upd_timer, &afs_vlocation_update_timer_ops);
- afs_async_op_init(&vlocation->upd_op, &afs_vlocation_update_op_ops);
-
- afs_get_cell(cell);
- vlocation->cell = cell;
-
- list_add_tail(&vlocation->link, &cell->vl_list);
-
-#ifdef AFS_CACHING_SUPPORT
- /* we want to store it in the cache, plus it might already be
- * encached */
- cachefs_acquire_cookie(cell->cache,
- &afs_volume_cache_index_def,
- vlocation,
- &vlocation->cache);
-
- if (vlocation->valid)
- goto found_in_cache;
-#endif
-
- /* try to look up an unknown volume in the cell VL databases by name */
- ret = afs_vlocation_access_vl_by_name(vlocation, name, namesz, &vldb);
- if (ret < 0) {
- printk("kAFS: failed to locate '%*.*s' in cell '%s'\n",
- namesz, namesz, name, cell->name);
- goto error;
+ struct afs_vlocation *vl;
+
+ vl = kzalloc(sizeof(struct afs_vlocation), GFP_KERNEL);
+ if (vl) {
+ vl->cell = cell;
+ vl->state = AFS_VL_NEW;
+ atomic_set(&vl->usage, 1);
+ INIT_LIST_HEAD(&vl->link);
+ INIT_LIST_HEAD(&vl->grave);
+ INIT_LIST_HEAD(&vl->update);
+ init_waitqueue_head(&vl->waitq);
+ rwlock_init(&vl->lock);
+ memcpy(vl->vldb.name, name, namesz);
}
- goto found_on_vlserver;
-
-found_in_graveyard:
- /* found in the graveyard - resurrect */
- _debug("found in graveyard");
- atomic_inc(&vlocation->usage);
- list_move_tail(&vlocation->link, &cell->vl_list);
- spin_unlock(&cell->vl_gylock);
-
- afs_kafstimod_del_timer(&vlocation->timeout);
- goto active;
-
-found_in_memory:
- /* found in memory - check to see if it's active */
- _debug("found in memory");
- atomic_inc(&vlocation->usage);
+ _leave(" = %p", vl);
+ return vl;
+}
-active:
- active = 1;
+/*
+ * update record if we found it in the cache
+ */
+static int afs_vlocation_update_record(struct afs_vlocation *vl,
+ struct afs_cache_vlocation *vldb)
+{
+ afs_voltype_t voltype;
+ afs_volid_t vid;
+ int ret;
-#ifdef AFS_CACHING_SUPPORT
-found_in_cache:
-#endif
/* try to look up a cached volume in the cell VL databases by ID */
- _debug("found in cache");
-
_debug("Locally Cached: %s %02x { %08x(%x) %08x(%x) %08x(%x) }",
- vlocation->vldb.name,
- vlocation->vldb.vidmask,
- ntohl(vlocation->vldb.servers[0].s_addr),
- vlocation->vldb.srvtmask[0],
- ntohl(vlocation->vldb.servers[1].s_addr),
- vlocation->vldb.srvtmask[1],
- ntohl(vlocation->vldb.servers[2].s_addr),
- vlocation->vldb.srvtmask[2]
- );
+ vl->vldb.name,
+ vl->vldb.vidmask,
+ ntohl(vl->vldb.servers[0].s_addr),
+ vl->vldb.srvtmask[0],
+ ntohl(vl->vldb.servers[1].s_addr),
+ vl->vldb.srvtmask[1],
+ ntohl(vl->vldb.servers[2].s_addr),
+ vl->vldb.srvtmask[2]);
_debug("Vids: %08x %08x %08x",
- vlocation->vldb.vid[0],
- vlocation->vldb.vid[1],
- vlocation->vldb.vid[2]);
+ vl->vldb.vid[0],
+ vl->vldb.vid[1],
+ vl->vldb.vid[2]);
- if (vlocation->vldb.vidmask & AFS_VOL_VTM_RW) {
- vid = vlocation->vldb.vid[0];
+ if (vl->vldb.vidmask & AFS_VOL_VTM_RW) {
+ vid = vl->vldb.vid[0];
voltype = AFSVL_RWVOL;
- } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_RO) {
- vid = vlocation->vldb.vid[1];
+ } else if (vl->vldb.vidmask & AFS_VOL_VTM_RO) {
+ vid = vl->vldb.vid[1];
voltype = AFSVL_ROVOL;
- } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_BAK) {
- vid = vlocation->vldb.vid[2];
+ } else if (vl->vldb.vidmask & AFS_VOL_VTM_BAK) {
+ vid = vl->vldb.vid[2];
voltype = AFSVL_BACKVOL;
} else {
BUG();
voltype = 0;
}
- ret = afs_vlocation_access_vl_by_id(vlocation, vid, voltype, &vldb);
+ /* contact the server to make sure the volume is still available
+ * - TODO: need to handle disconnected operation here
+ */
+ ret = afs_vlocation_access_vl_by_id(vl, vid, voltype, vldb);
switch (ret) {
/* net error */
default:
- printk("kAFS: failed to volume '%*.*s' (%x) up in '%s': %d\n",
- namesz, namesz, name, vid, cell->name, ret);
- goto error;
+ printk(KERN_WARNING "kAFS:"
+ " failed to update volume '%s' (%x) up in '%s': %d\n",
+ vl->vldb.name, vid, vl->cell->name, ret);
+ _leave(" = %d", ret);
+ return ret;
/* pulled from local cache into memory */
case 0:
- goto found_on_vlserver;
+ _leave(" = 0");
+ return 0;
/* uh oh... looks like the volume got deleted */
case -ENOMEDIUM:
- printk("kAFS: volume '%*.*s' (%x) does not exist '%s'\n",
- namesz, namesz, name, vid, cell->name);
+ printk(KERN_ERR "kAFS:"
+ " volume '%s' (%x) does not exist '%s'\n",
+ vl->vldb.name, vid, vl->cell->name);
/* TODO: make existing record unavailable */
- goto error;
+ _leave(" = %d", ret);
+ return ret;
}
+}
-found_on_vlserver:
- _debug("Done VL Lookup: %*.*s %02x { %08x(%x) %08x(%x) %08x(%x) }",
- namesz, namesz, name,
- vldb.vidmask,
- ntohl(vldb.servers[0].s_addr), vldb.srvtmask[0],
- ntohl(vldb.servers[1].s_addr), vldb.srvtmask[1],
- ntohl(vldb.servers[2].s_addr), vldb.srvtmask[2]
- );
-
- _debug("Vids: %08x %08x %08x", vldb.vid[0], vldb.vid[1], vldb.vid[2]);
+/*
+ * apply the update to a VL record
+ */
+static void afs_vlocation_apply_update(struct afs_vlocation *vl,
+ struct afs_cache_vlocation *vldb)
+{
+ _debug("Done VL Lookup: %s %02x { %08x(%x) %08x(%x) %08x(%x) }",
+ vldb->name, vldb->vidmask,
+ ntohl(vldb->servers[0].s_addr), vldb->srvtmask[0],
+ ntohl(vldb->servers[1].s_addr), vldb->srvtmask[1],
+ ntohl(vldb->servers[2].s_addr), vldb->srvtmask[2]);
- if ((namesz < sizeof(vlocation->vldb.name) &&
- vlocation->vldb.name[namesz] != '\0') ||
- memcmp(vldb.name, name, namesz) != 0)
- printk("kAFS: name of volume '%*.*s' changed to '%s' on server\n",
- namesz, namesz, name, vldb.name);
+ _debug("Vids: %08x %08x %08x",
+ vldb->vid[0], vldb->vid[1], vldb->vid[2]);
- memcpy(&vlocation->vldb, &vldb, sizeof(vlocation->vldb));
+ if (strcmp(vldb->name, vl->vldb.name) != 0)
+ printk(KERN_NOTICE "kAFS:"
+ " name of volume '%s' changed to '%s' on server\n",
+ vl->vldb.name, vldb->name);
- afs_kafstimod_add_timer(&vlocation->upd_timer, 10 * HZ);
+ vl->vldb = *vldb;
#ifdef AFS_CACHING_SUPPORT
/* update volume entry in local cache */
- cachefs_update_cookie(vlocation->cache);
-#endif
-
- *_vlocation = vlocation;
- _leave(" = 0 (%p)",vlocation);
- return 0;
-
-error:
- if (vlocation) {
- if (active) {
- __afs_put_vlocation(vlocation);
- } else {
- list_del(&vlocation->link);
-#ifdef AFS_CACHING_SUPPORT
- cachefs_relinquish_cookie(vlocation->cache, 0);
+ cachefs_update_cookie(vl->cache);
#endif
- afs_put_cell(vlocation->cell);
- kfree(vlocation);
- }
- }
-
- _leave(" = %d", ret);
- return ret;
}
/*
- * finish using a volume location record
- * - caller must have cell->vol_sem write-locked
+ * fill in a volume location record, consulting the cache and the VL server
+ * both
*/
-static void __afs_put_vlocation(struct afs_vlocation *vlocation)
+static int afs_vlocation_fill_in_record(struct afs_vlocation *vl)
{
- struct afs_cell *cell;
+ struct afs_cache_vlocation vldb;
+ int ret;
- if (!vlocation)
- return;
+ _enter("");
- _enter("%s", vlocation->vldb.name);
+ ASSERTCMP(vl->valid, ==, 0);
- cell = vlocation->cell;
+ memset(&vldb, 0, sizeof(vldb));
- /* sanity check */
- BUG_ON(atomic_read(&vlocation->usage) <= 0);
+ /* see if we have an in-cache copy (will set vl->valid if there is) */
+#ifdef AFS_CACHING_SUPPORT
+ cachefs_acquire_cookie(cell->cache,
+ &afs_volume_cache_index_def,
+ vlocation,
+ &vl->cache);
+#endif
- spin_lock(&cell->vl_gylock);
- if (likely(!atomic_dec_and_test(&vlocation->usage))) {
- spin_unlock(&cell->vl_gylock);
- _leave("");
- return;
+ if (vl->valid) {
+ /* try to update a known volume in the cell VL databases by
+ * ID as the name may have changed */
+ _debug("found in cache");
+ ret = afs_vlocation_update_record(vl, &vldb);
+ } else {
+ /* try to look up an unknown volume in the cell VL databases by
+ * name */
+ ret = afs_vlocation_access_vl_by_name(vl, &vldb);
+ if (ret < 0) {
+ printk("kAFS: failed to locate '%s' in cell '%s'\n",
+ vl->vldb.name, vl->cell->name);
+ return ret;
+ }
}
- /* move to graveyard queue */
- list_move_tail(&vlocation->link,&cell->vl_graveyard);
-
- /* remove from pending timeout queue (refcounted if actually being
- * updated) */
- list_del_init(&vlocation->upd_op.link);
-
- /* time out in 10 secs */
- afs_kafstimod_del_timer(&vlocation->upd_timer);
- afs_kafstimod_add_timer(&vlocation->timeout, 10 * HZ);
-
- spin_unlock(&cell->vl_gylock);
-
- _leave(" [killed]");
+ afs_vlocation_apply_update(vl, &vldb);
+ _leave(" = 0");
+ return 0;
}
/*
- * finish using a volume location record
+ * queue a vlocation record for updates
*/
-void afs_put_vlocation(struct afs_vlocation *vlocation)
+void afs_vlocation_queue_for_updates(struct afs_vlocation *vl)
{
- if (vlocation) {
- struct afs_cell *cell = vlocation->cell;
+ struct afs_vlocation *xvl;
- down_write(&cell->vl_sem);
- __afs_put_vlocation(vlocation);
- up_write(&cell->vl_sem);
+ /* wait at least 10 minutes before updating... */
+ vl->update_at = get_seconds() + afs_vlocation_update_timeout;
+
+ spin_lock(&afs_vlocation_updates_lock);
+
+ if (!list_empty(&afs_vlocation_updates)) {
+ /* ... but wait at least 1 second more than the newest record
+ * already queued so that we don't spam the VL server suddenly
+ * with lots of requests
+ */
+ xvl = list_entry(afs_vlocation_updates.prev,
+ struct afs_vlocation, update);
+ if (vl->update_at <= xvl->update_at)
+ vl->update_at = xvl->update_at + 1;
+ } else {
+ queue_delayed_work(afs_vlocation_update_worker,
+ &afs_vlocation_update,
+ afs_vlocation_update_timeout * HZ);
}
+
+ list_add_tail(&vl->update, &afs_vlocation_updates);
+ spin_unlock(&afs_vlocation_updates_lock);
}
/*
- * timeout vlocation record
- * - removes from the cell's graveyard if the usage count is zero
+ * lookup volume location
+ * - iterate through the VL servers in a cell until one of them admits knowing
+ * about the volume in question
+ * - lookup in the local cache if not able to find on the VL server
+ * - insert/update in the local cache if did get a VL response
*/
-void afs_vlocation_do_timeout(struct afs_vlocation *vlocation)
+struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *cell,
+ const char *name,
+ size_t namesz)
{
- struct afs_cell *cell;
-
- _enter("%s", vlocation->vldb.name);
-
- cell = vlocation->cell;
+ struct afs_vlocation *vl;
+ int ret;
- BUG_ON(atomic_read(&vlocation->usage) < 0);
+ _enter("{%s},%*.*s,%zu",
+ cell->name, (int) namesz, (int) namesz, name, namesz);
- /* remove from graveyard if still dead */
- spin_lock(&cell->vl_gylock);
- if (atomic_read(&vlocation->usage) == 0)
- list_del_init(&vlocation->link);
- else
- vlocation = NULL;
- spin_unlock(&cell->vl_gylock);
+ if (namesz > sizeof(vl->vldb.name)) {
+ _leave(" = -ENAMETOOLONG");
+ return ERR_PTR(-ENAMETOOLONG);
+ }
- if (!vlocation) {
- _leave("");
- return; /* resurrected */
+ /* see if we have an in-memory copy first */
+ down_write(&cell->vl_sem);
+ spin_lock(&cell->vl_lock);
+ list_for_each_entry(vl, &cell->vl_list, link) {
+ if (vl->vldb.name[namesz] != '\0')
+ continue;
+ if (memcmp(vl->vldb.name, name, namesz) == 0)
+ goto found_in_memory;
}
+ spin_unlock(&cell->vl_lock);
- /* we can now destroy it properly */
-#ifdef AFS_CACHING_SUPPORT
- cachefs_relinquish_cookie(vlocation->cache, 0);
-#endif
- afs_put_cell(cell);
+ /* not in the cell's in-memory lists - create a new record */
+ vl = afs_vlocation_alloc(cell, name, namesz);
+ if (!vl) {
+ up_write(&cell->vl_sem);
+ return ERR_PTR(-ENOMEM);
+ }
- kfree(vlocation);
+ afs_get_cell(cell);
- _leave(" [destroyed]");
-}
+ list_add_tail(&vl->link, &cell->vl_list);
+ vl->state = AFS_VL_CREATING;
+ up_write(&cell->vl_sem);
-/*
- * send an update operation to the currently selected server
- */
-static int afs_vlocation_update_begin(struct afs_vlocation *vlocation)
-{
- afs_voltype_t voltype;
- afs_volid_t vid;
- int ret;
+fill_in_record:
+ ret = afs_vlocation_fill_in_record(vl);
+ if (ret < 0)
+ goto error_abandon;
+ vl->state = AFS_VL_VALID;
+ wake_up(&vl->waitq);
- _enter("%s{ufs=%u ucs=%u}",
- vlocation->vldb.name,
- vlocation->upd_first_svix,
- vlocation->upd_curr_svix);
+ /* schedule for regular updates */
+ afs_vlocation_queue_for_updates(vl);
+ goto success;
- /* try to look up a cached volume in the cell VL databases by ID */
- if (vlocation->vldb.vidmask & AFS_VOL_VTM_RW) {
- vid = vlocation->vldb.vid[0];
- voltype = AFSVL_RWVOL;
- } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_RO) {
- vid = vlocation->vldb.vid[1];
- voltype = AFSVL_ROVOL;
- } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_BAK) {
- vid = vlocation->vldb.vid[2];
- voltype = AFSVL_BACKVOL;
- } else {
- BUG();
- vid = 0;
- voltype = 0;
+found_in_memory:
+ /* found in memory */
+ _debug("found in memory");
+ atomic_inc(&vl->usage);
+ spin_unlock(&cell->vl_lock);
+ if (!list_empty(&vl->grave)) {
+ spin_lock(&afs_vlocation_graveyard_lock);
+ list_del_init(&vl->grave);
+ spin_unlock(&afs_vlocation_graveyard_lock);
}
+ up_write(&cell->vl_sem);
- /* contact the chosen server */
- ret = afs_server_lookup(
- vlocation->cell,
- &vlocation->cell->vl_addrs[vlocation->upd_curr_svix],
- &vlocation->upd_op.server);
+ /* see if it was an abandoned record that we might try filling in */
+ while (vl->state != AFS_VL_VALID) {
+ afs_vlocation_state_t state = vl->state;
- switch (ret) {
- case 0:
- break;
- case -ENOMEM:
- case -ENONET:
- default:
- _leave(" = %d", ret);
- return ret;
- }
+ _debug("invalid [state %d]", state);
- /* initiate the update operation */
- ret = afs_rxvl_get_entry_by_id_async(&vlocation->upd_op, vid, voltype);
- if (ret < 0) {
- _leave(" = %d", ret);
- return ret;
+ if ((state == AFS_VL_NEW || state == AFS_VL_NO_VOLUME)) {
+ if (cmpxchg(&vl->state, state, AFS_VL_CREATING) ==
+ state)
+ goto fill_in_record;
+ continue;
+ }
+
+ /* must now wait for creation or update by someone else to
+ * complete */
+ _debug("wait");
+
+ ret = wait_event_interruptible(
+ vl->waitq,
+ vl->state == AFS_VL_NEW ||
+ vl->state == AFS_VL_VALID ||
+ vl->state == AFS_VL_NO_VOLUME);
+ if (ret < 0)
+ goto error;
}
+success:
+ _leave(" = %p",vl);
+ return vl;
+
+error_abandon:
+ vl->state = AFS_VL_NEW;
+ wake_up(&vl->waitq);
+error:
+ ASSERT(vl != NULL);
+ afs_put_vlocation(vl);
_leave(" = %d", ret);
- return ret;
+ return ERR_PTR(ret);
}
/*
- * abandon updating a VL record
- * - does not restart the update timer
+ * finish using a volume location record
*/
-static void afs_vlocation_update_abandon(struct afs_vlocation *vlocation,
- afs_vlocation_upd_t state,
- int ret)
+void afs_put_vlocation(struct afs_vlocation *vl)
{
- _enter("%s,%u", vlocation->vldb.name, state);
-
- if (ret < 0)
- printk("kAFS: Abandoning VL update '%s': %d\n",
- vlocation->vldb.name, ret);
-
- /* discard the server record */
- afs_put_server(vlocation->upd_op.server);
- vlocation->upd_op.server = NULL;
+ if (!vl)
+ return;
- spin_lock(&afs_vlocation_update_lock);
- afs_vlocation_update = NULL;
- vlocation->upd_state = state;
+ _enter("%s", vl->vldb.name);
- /* TODO: start updating next VL record on pending list */
+ ASSERTCMP(atomic_read(&vl->usage), >, 0);
- spin_unlock(&afs_vlocation_update_lock);
+ if (likely(!atomic_dec_and_test(&vl->usage))) {
+ _leave("");
+ return;
+ }
- _leave("");
+ spin_lock(&afs_vlocation_graveyard_lock);
+ if (atomic_read(&vl->usage) == 0) {
+ _debug("buried");
+ list_move_tail(&vl->grave, &afs_vlocation_graveyard);
+ vl->time_of_death = get_seconds();
+ schedule_delayed_work(&afs_vlocation_reap,
+ afs_vlocation_timeout * HZ);
+
+ /* suspend updates on this record */
+ if (!list_empty(&vl->update)) {
+ spin_lock(&afs_vlocation_updates_lock);
+ list_del_init(&vl->update);
+ spin_unlock(&afs_vlocation_updates_lock);
+ }
+ }
+ spin_unlock(&afs_vlocation_graveyard_lock);
+ _leave(" [killed?]");
}
/*
- * handle periodic update timeouts and busy retry timeouts
- * - called from kafstimod
+ * destroy a dead volume location record
*/
-static void afs_vlocation_update_timer(struct afs_timer *timer)
+static void afs_vlocation_destroy(struct afs_vlocation *vl)
{
- struct afs_vlocation *vlocation =
- list_entry(timer, struct afs_vlocation, upd_timer);
- int ret;
+ _enter("%p", vl);
- _enter("%s", vlocation->vldb.name);
+#ifdef AFS_CACHING_SUPPORT
+ cachefs_relinquish_cookie(vl->cache, 0);
+#endif
- /* only update if not in the graveyard (defend against putting too) */
- spin_lock(&vlocation->cell->vl_gylock);
+ afs_put_cell(vl->cell);
+ kfree(vl);
+}
+
+/*
+ * reap dead volume location records
+ */
+static void afs_vlocation_reaper(struct work_struct *work)
+{
+ LIST_HEAD(corpses);
+ struct afs_vlocation *vl;
+ unsigned long delay, expiry;
+ time_t now;
- if (!atomic_read(&vlocation->usage))
- goto out_unlock1;
+ _enter("");
- spin_lock(&afs_vlocation_update_lock);
+ now = get_seconds();
+ spin_lock(&afs_vlocation_graveyard_lock);
+
+ while (!list_empty(&afs_vlocation_graveyard)) {
+ vl = list_entry(afs_vlocation_graveyard.next,
+ struct afs_vlocation, grave);
+
+ _debug("check %p", vl);
+
+ /* the queue is ordered most dead first */
+ expiry = vl->time_of_death + afs_vlocation_timeout;
+ if (expiry > now) {
+ delay = (expiry - now) * HZ;
+ _debug("delay %lu", delay);
+ if (!schedule_delayed_work(&afs_vlocation_reap,
+ delay)) {
+ cancel_delayed_work(&afs_vlocation_reap);
+ schedule_delayed_work(&afs_vlocation_reap,
+ delay);
+ }
+ break;
+ }
- /* if we were woken up due to EBUSY sleep then restart immediately if
- * possible or else jump to front of pending queue */
- if (vlocation->upd_state == AFS_VLUPD_BUSYSLEEP) {
- if (afs_vlocation_update) {
- list_add(&vlocation->upd_op.link,
- &afs_vlocation_update_pendq);
+ spin_lock(&vl->cell->vl_lock);
+ if (atomic_read(&vl->usage) > 0) {
+ _debug("no reap");
+ list_del_init(&vl->grave);
} else {
- afs_get_vlocation(vlocation);
- afs_vlocation_update = vlocation;
- vlocation->upd_state = AFS_VLUPD_INPROGRESS;
+ _debug("reap");
+ list_move_tail(&vl->grave, &corpses);
+ list_del_init(&vl->link);
}
- goto out_unlock2;
+ spin_unlock(&vl->cell->vl_lock);
}
- /* put on pending queue if there's already another update in progress */
- if (afs_vlocation_update) {
- vlocation->upd_state = AFS_VLUPD_PENDING;
- list_add_tail(&vlocation->upd_op.link,
- &afs_vlocation_update_pendq);
- goto out_unlock2;
- }
+ spin_unlock(&afs_vlocation_graveyard_lock);
- /* hold a ref on it while actually updating */
- afs_get_vlocation(vlocation);
- afs_vlocation_update = vlocation;
- vlocation->upd_state = AFS_VLUPD_INPROGRESS;
-
- spin_unlock(&afs_vlocation_update_lock);
- spin_unlock(&vlocation->cell->vl_gylock);
-
- /* okay... we can start the update */
- _debug("BEGIN VL UPDATE [%s]", vlocation->vldb.name);
- vlocation->upd_first_svix = vlocation->cell->vl_curr_svix;
- vlocation->upd_curr_svix = vlocation->upd_first_svix;
- vlocation->upd_rej_cnt = 0;
- vlocation->upd_busy_cnt = 0;
-
- ret = afs_vlocation_update_begin(vlocation);
- if (ret < 0) {
- afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, ret);
- afs_kafstimod_add_timer(&vlocation->upd_timer,
- AFS_VLDB_TIMEOUT);
- afs_put_vlocation(vlocation);
+ /* now reap the corpses we've extracted */
+ while (!list_empty(&corpses)) {
+ vl = list_entry(corpses.next, struct afs_vlocation, grave);
+ list_del(&vl->grave);
+ afs_vlocation_destroy(vl);
}
_leave("");
- return;
+}
-out_unlock2:
- spin_unlock(&afs_vlocation_update_lock);
-out_unlock1:
- spin_unlock(&vlocation->cell->vl_gylock);
- _leave("");
+/*
+ * initialise the VL update process
+ */
+int __init afs_vlocation_update_init(void)
+{
+ afs_vlocation_update_worker =
+ create_singlethread_workqueue("kafs_vlupdated");
+ return afs_vlocation_update_worker ? 0 : -ENOMEM;
+}
+
+/*
+ * discard all the volume location records for rmmod
+ */
+void __exit afs_vlocation_purge(void)
+{
+ afs_vlocation_timeout = 0;
+
+ spin_lock(&afs_vlocation_updates_lock);
+ list_del_init(&afs_vlocation_updates);
+ spin_unlock(&afs_vlocation_updates_lock);
+ cancel_delayed_work(&afs_vlocation_update);
+ queue_delayed_work(afs_vlocation_update_worker,
+ &afs_vlocation_update, 0);
+ destroy_workqueue(afs_vlocation_update_worker);
+
+ cancel_delayed_work(&afs_vlocation_reap);
+ schedule_delayed_work(&afs_vlocation_reap, 0);
}
/*
- * attend to an update operation upon which an event happened
- * - called in kafsasyncd context
+ * update a volume location
*/
-static void afs_vlocation_update_attend(struct afs_async_op *op)
+static void afs_vlocation_updater(struct work_struct *work)
{
struct afs_cache_vlocation vldb;
- struct afs_vlocation *vlocation =
- list_entry(op, struct afs_vlocation, upd_op);
- unsigned tmp;
+ struct afs_vlocation *vl, *xvl;
+ time_t now;
+ long timeout;
int ret;
- _enter("%s", vlocation->vldb.name);
-
- ret = afs_rxvl_get_entry_by_id_async2(op, &vldb);
- switch (ret) {
- case -EAGAIN:
- _leave(" [unfinished]");
- return;
-
- case 0:
- _debug("END VL UPDATE: %d\n", ret);
- vlocation->valid = 1;
-
- _debug("Done VL Lookup: %02x { %08x(%x) %08x(%x) %08x(%x) }",
- vldb.vidmask,
- ntohl(vldb.servers[0].s_addr), vldb.srvtmask[0],
- ntohl(vldb.servers[1].s_addr), vldb.srvtmask[1],
- ntohl(vldb.servers[2].s_addr), vldb.srvtmask[2]
- );
-
- _debug("Vids: %08x %08x %08x",
- vldb.vid[0], vldb.vid[1], vldb.vid[2]);
-
- afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, 0);
-
- down_write(&vlocation->cell->vl_sem);
-
- /* actually update the cache */
- if (strncmp(vldb.name, vlocation->vldb.name,
- sizeof(vlocation->vldb.name)) != 0)
- printk("kAFS: name of volume '%s'"
- " changed to '%s' on server\n",
- vlocation->vldb.name, vldb.name);
-
- memcpy(&vlocation->vldb, &vldb, sizeof(vlocation->vldb));
-
-#if 0
- /* TODO update volume entry in local cache */
-#endif
-
- up_write(&vlocation->cell->vl_sem);
-
- if (ret < 0)
- printk("kAFS: failed to update local cache: %d\n", ret);
-
- afs_kafstimod_add_timer(&vlocation->upd_timer,
- AFS_VLDB_TIMEOUT);
- afs_put_vlocation(vlocation);
- _leave(" [found]");
- return;
-
- case -ENOMEDIUM:
- vlocation->upd_rej_cnt++;
- goto try_next;
-
- /* the server is locked - retry in a very short while */
- case -EBUSY:
- vlocation->upd_busy_cnt++;
- if (vlocation->upd_busy_cnt > 3)
- goto try_next; /* too many retries */
-
- afs_vlocation_update_abandon(vlocation,
- AFS_VLUPD_BUSYSLEEP, 0);
- afs_kafstimod_add_timer(&vlocation->upd_timer, HZ / 2);
- afs_put_vlocation(vlocation);
- _leave(" [busy]");
- return;
-
- case -ENETUNREACH:
- case -EHOSTUNREACH:
- case -ECONNREFUSED:
- case -EREMOTEIO:
- /* record bad vlserver info in the cell too
- * - TODO: use down_write_trylock() if available
- */
- if (vlocation->upd_curr_svix == vlocation->cell->vl_curr_svix)
- vlocation->cell->vl_curr_svix =
- vlocation->cell->vl_curr_svix %
- vlocation->cell->vl_naddrs;
-
- case -EBADRQC:
- case -EINVAL:
- case -EACCES:
- case -EBADMSG:
- goto try_next;
-
- default:
- goto abandon;
- }
-
- /* try contacting the next server */
-try_next:
- vlocation->upd_busy_cnt = 0;
-
- /* discard the server record */
- afs_put_server(vlocation->upd_op.server);
- vlocation->upd_op.server = NULL;
+ _enter("");
- tmp = vlocation->cell->vl_naddrs;
- if (tmp == 0)
- goto abandon;
+ now = get_seconds();
- vlocation->upd_curr_svix++;
- if (vlocation->upd_curr_svix >= tmp)
- vlocation->upd_curr_svix = 0;
- if (vlocation->upd_first_svix >= tmp)
- vlocation->upd_first_svix = tmp - 1;
+ /* find a record to update */
+ spin_lock(&afs_vlocation_updates_lock);
+ for (;;) {
+ if (list_empty(&afs_vlocation_updates)) {
+ spin_unlock(&afs_vlocation_updates_lock);
+ _leave(" [nothing]");
+ return;
+ }
- /* move to the next server */
- if (vlocation->upd_curr_svix != vlocation->upd_first_svix) {
- afs_vlocation_update_begin(vlocation);
- _leave(" [next]");
- return;
+ vl = list_entry(afs_vlocation_updates.next,
+ struct afs_vlocation, update);
+ if (atomic_read(&vl->usage) > 0)
+ break;
+ list_del_init(&vl->update);
}
- /* run out of servers to try - was the volume rejected? */
- if (vlocation->upd_rej_cnt > 0) {
- printk("kAFS: Active volume no longer valid '%s'\n",
- vlocation->vldb.name);
- vlocation->valid = 0;
- afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, 0);
- afs_kafstimod_add_timer(&vlocation->upd_timer,
- AFS_VLDB_TIMEOUT);
- afs_put_vlocation(vlocation);
- _leave(" [invalidated]");
+ timeout = vl->update_at - now;
+ if (timeout > 0) {
+ queue_delayed_work(afs_vlocation_update_worker,
+ &afs_vlocation_update, timeout * HZ);
+ spin_unlock(&afs_vlocation_updates_lock);
+ _leave(" [nothing]");
return;
}
- /* abandon the update */
-abandon:
- afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, ret);
- afs_kafstimod_add_timer(&vlocation->upd_timer, HZ * 10);
- afs_put_vlocation(vlocation);
- _leave(" [abandoned]");
-}
+ list_del_init(&vl->update);
+ atomic_inc(&vl->usage);
+ spin_unlock(&afs_vlocation_updates_lock);
-/*
- * deal with an update operation being discarded
- * - called in kafsasyncd context when it's dying due to rmmod
- * - the call has already been aborted and put()'d
- */
-static void afs_vlocation_update_discard(struct afs_async_op *op)
-{
- struct afs_vlocation *vlocation =
- list_entry(op, struct afs_vlocation, upd_op);
-
- _enter("%s", vlocation->vldb.name);
+ /* we can now perform the update */
+ _debug("update %s", vl->vldb.name);
+ vl->state = AFS_VL_UPDATING;
+ vl->upd_rej_cnt = 0;
+ vl->upd_busy_cnt = 0;
- afs_put_server(op->server);
- op->server = NULL;
-
- afs_put_vlocation(vlocation);
+ ret = afs_vlocation_update_record(vl, &vldb);
+ switch (ret) {
+ case 0:
+ afs_vlocation_apply_update(vl, &vldb);
+ vl->state = AFS_VL_VALID;
+ break;
+ case -ENOMEDIUM:
+ vl->state = AFS_VL_VOLUME_DELETED;
+ break;
+ default:
+ vl->state = AFS_VL_UNCERTAIN;
+ break;
+ }
- _leave("");
-}
+ /* and then reschedule */
+ _debug("reschedule");
+ vl->update_at = get_seconds() + afs_vlocation_update_timeout;
-/*
- * match a VLDB record stored in the cache
- * - may also load target from entry
- */
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_vlocation_cache_match(void *target,
- const void *entry)
-{
- const struct afs_cache_vlocation *vldb = entry;
- struct afs_vlocation *vlocation = target;
-
- _enter("{%s},{%s}", vlocation->vldb.name, vldb->name);
-
- if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0
- ) {
- if (!vlocation->valid ||
- vlocation->vldb.rtime == vldb->rtime
- ) {
- vlocation->vldb = *vldb;
- vlocation->valid = 1;
- _leave(" = SUCCESS [c->m]");
- return CACHEFS_MATCH_SUCCESS;
- } else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) {
- /* delete if VIDs for this name differ */
- if (memcmp(&vlocation->vldb.vid,
- &vldb->vid,
- sizeof(vldb->vid)) != 0) {
- _leave(" = DELETE");
- return CACHEFS_MATCH_SUCCESS_DELETE;
- }
+ spin_lock(&afs_vlocation_updates_lock);
- _leave(" = UPDATE");
- return CACHEFS_MATCH_SUCCESS_UPDATE;
- } else {
- _leave(" = SUCCESS");
- return CACHEFS_MATCH_SUCCESS;
- }
+ if (!list_empty(&afs_vlocation_updates)) {
+ /* next update in 10 minutes, but wait at least 1 second more
+ * than the newest record already queued so that we don't spam
+ * the VL server suddenly with lots of requests
+ */
+ xvl = list_entry(afs_vlocation_updates.prev,
+ struct afs_vlocation, update);
+ if (vl->update_at <= xvl->update_at)
+ vl->update_at = xvl->update_at + 1;
+ xvl = list_entry(afs_vlocation_updates.next,
+ struct afs_vlocation, update);
+ timeout = xvl->update_at - now;
+ if (timeout < 0)
+ timeout = 0;
+ } else {
+ timeout = afs_vlocation_update_timeout;
}
- _leave(" = FAILED");
- return CACHEFS_MATCH_FAILED;
-}
-#endif
+ ASSERT(list_empty(&vl->update));
-/*
- * update a VLDB record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static void afs_vlocation_cache_update(void *source, void *entry)
-{
- struct afs_cache_vlocation *vldb = entry;
- struct afs_vlocation *vlocation = source;
-
- _enter("");
+ list_add_tail(&vl->update, &afs_vlocation_updates);
- *vldb = vlocation->vldb;
+ _debug("timeout %ld", timeout);
+ queue_delayed_work(afs_vlocation_update_worker,
+ &afs_vlocation_update, timeout * HZ);
+ spin_unlock(&afs_vlocation_updates_lock);
+ afs_put_vlocation(vl);
}
-#endif
/* AFS vnode management
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fs.h>
-#include <linux/pagemap.h>
-#include "volume.h"
-#include "cell.h"
-#include "cmservice.h"
-#include "fsclient.h"
-#include "vlclient.h"
-#include "vnode.h"
#include "internal.h"
-static void afs_vnode_cb_timed_out(struct afs_timer *timer);
+#if 0
+static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent,
+ int depth, char lr)
+{
+ struct afs_vnode *vnode;
+ bool bad = false;
+
+ if (!node)
+ return false;
+
+ if (node->rb_left)
+ bad = dump_tree_aux(node->rb_left, node, depth + 2, '/');
+
+ vnode = rb_entry(node, struct afs_vnode, cb_promise);
+ kdebug("%c %*.*s%c%p {%d}",
+ rb_is_red(node) ? 'R' : 'B',
+ depth, depth, "", lr,
+ vnode, vnode->cb_expires_at);
+ if (rb_parent(node) != parent) {
+ printk("BAD: %p != %p\n", rb_parent(node), parent);
+ bad = true;
+ }
-struct afs_timer_ops afs_vnode_cb_timed_out_ops = {
- .timed_out = afs_vnode_cb_timed_out,
-};
+ if (node->rb_right)
+ bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\');
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_vnode_cache_match(void *target,
- const void *entry);
-static void afs_vnode_cache_update(void *source, void *entry);
+ return bad;
+}
-struct cachefs_index_def afs_vnode_cache_index_def = {
- .name = "vnode",
- .data_size = sizeof(struct afs_cache_vnode),
- .keys[0] = { CACHEFS_INDEX_KEYS_BIN, 4 },
- .match = afs_vnode_cache_match,
- .update = afs_vnode_cache_update,
-};
+static noinline void dump_tree(const char *name, struct afs_server *server)
+{
+ kenter("%s", name);
+ if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-'))
+ BUG();
+}
#endif
/*
- * handle a callback timing out
- * TODO: retain a ref to vnode struct for an outstanding callback timeout
+ * insert a vnode into the backing server's vnode tree
*/
-static void afs_vnode_cb_timed_out(struct afs_timer *timer)
+static void afs_install_vnode(struct afs_vnode *vnode,
+ struct afs_server *server)
{
- struct afs_server *oldserver;
- struct afs_vnode *vnode;
+ struct afs_server *old_server = vnode->server;
+ struct afs_vnode *xvnode;
+ struct rb_node *parent, **p;
- vnode = list_entry(timer, struct afs_vnode, cb_timeout);
+ _enter("%p,%p", vnode, server);
- _enter("%p", vnode);
+ if (old_server) {
+ spin_lock(&old_server->fs_lock);
+ rb_erase(&vnode->server_rb, &old_server->fs_vnodes);
+ spin_unlock(&old_server->fs_lock);
+ }
- /* set the changed flag in the vnode and release the server */
- spin_lock(&vnode->lock);
+ afs_get_server(server);
+ vnode->server = server;
+ afs_put_server(old_server);
+
+ /* insert into the server's vnode tree in FID order */
+ spin_lock(&server->fs_lock);
+
+ parent = NULL;
+ p = &server->fs_vnodes.rb_node;
+ while (*p) {
+ parent = *p;
+ xvnode = rb_entry(parent, struct afs_vnode, server_rb);
+ if (vnode->fid.vid < xvnode->fid.vid)
+ p = &(*p)->rb_left;
+ else if (vnode->fid.vid > xvnode->fid.vid)
+ p = &(*p)->rb_right;
+ else if (vnode->fid.vnode < xvnode->fid.vnode)
+ p = &(*p)->rb_left;
+ else if (vnode->fid.vnode > xvnode->fid.vnode)
+ p = &(*p)->rb_right;
+ else if (vnode->fid.unique < xvnode->fid.unique)
+ p = &(*p)->rb_left;
+ else if (vnode->fid.unique > xvnode->fid.unique)
+ p = &(*p)->rb_right;
+ else
+ BUG(); /* can't happen unless afs_iget() malfunctions */
+ }
- oldserver = xchg(&vnode->cb_server, NULL);
- if (oldserver) {
- vnode->flags |= AFS_VNODE_CHANGED;
+ rb_link_node(&vnode->server_rb, parent, p);
+ rb_insert_color(&vnode->server_rb, &server->fs_vnodes);
- spin_lock(&afs_cb_hash_lock);
- list_del_init(&vnode->cb_hash_link);
- spin_unlock(&afs_cb_hash_lock);
+ spin_unlock(&server->fs_lock);
+ _leave("");
+}
- spin_lock(&oldserver->cb_lock);
- list_del_init(&vnode->cb_link);
- spin_unlock(&oldserver->cb_lock);
+/*
+ * insert a vnode into the promising server's update/expiration tree
+ * - caller must hold vnode->lock
+ */
+static void afs_vnode_note_promise(struct afs_vnode *vnode,
+ struct afs_server *server)
+{
+ struct afs_server *old_server;
+ struct afs_vnode *xvnode;
+ struct rb_node *parent, **p;
+
+ _enter("%p,%p", vnode, server);
+
+ ASSERT(server != NULL);
+
+ old_server = vnode->server;
+ if (vnode->cb_promised) {
+ if (server == old_server &&
+ vnode->cb_expires == vnode->cb_expires_at) {
+ _leave(" [no change]");
+ return;
+ }
+
+ spin_lock(&old_server->cb_lock);
+ if (vnode->cb_promised) {
+ _debug("delete");
+ rb_erase(&vnode->cb_promise, &old_server->cb_promises);
+ vnode->cb_promised = false;
+ }
+ spin_unlock(&old_server->cb_lock);
}
- spin_unlock(&vnode->lock);
+ if (vnode->server != server)
+ afs_install_vnode(vnode, server);
+
+ vnode->cb_expires_at = vnode->cb_expires;
+ _debug("PROMISE on %p {%lu}",
+ vnode, (unsigned long) vnode->cb_expires_at);
+
+ /* abuse an RB-tree to hold the expiration order (we may have multiple
+ * items with the same expiration time) */
+ spin_lock(&server->cb_lock);
+
+ parent = NULL;
+ p = &server->cb_promises.rb_node;
+ while (*p) {
+ parent = *p;
+ xvnode = rb_entry(parent, struct afs_vnode, cb_promise);
+ if (vnode->cb_expires_at < xvnode->cb_expires_at)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
- afs_put_server(oldserver);
+ rb_link_node(&vnode->cb_promise, parent, p);
+ rb_insert_color(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = true;
+ spin_unlock(&server->cb_lock);
_leave("");
}
/*
+ * handle remote file deletion by discarding the callback promise
+ */
+static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
+{
+ struct afs_server *server;
+
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+
+ server = vnode->server;
+ if (vnode->cb_promised) {
+ spin_lock(&server->cb_lock);
+ if (vnode->cb_promised) {
+ rb_erase(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = false;
+ }
+ spin_unlock(&server->cb_lock);
+ }
+
+ afs_put_server(server);
+}
+
+/*
* finish off updating the recorded status of a file
* - starts callback expiry timer
* - adds to server's callback list
spin_lock(&vnode->lock);
- vnode->flags &= ~AFS_VNODE_CHANGED;
-
- if (ret == 0) {
- /* adjust the callback timeout appropriately */
- afs_kafstimod_add_timer(&vnode->cb_timeout,
- vnode->cb_expiry * HZ);
-
- spin_lock(&afs_cb_hash_lock);
- list_move_tail(&vnode->cb_hash_link,
- &afs_cb_hash(server, &vnode->fid));
- spin_unlock(&afs_cb_hash_lock);
-
- /* swap ref to old callback server with that for new callback
- * server */
- oldserver = xchg(&vnode->cb_server, server);
- if (oldserver != server) {
- if (oldserver) {
- spin_lock(&oldserver->cb_lock);
- list_del_init(&vnode->cb_link);
- spin_unlock(&oldserver->cb_lock);
- }
-
- afs_get_server(server);
- spin_lock(&server->cb_lock);
- list_add_tail(&vnode->cb_link, &server->cb_promises);
- spin_unlock(&server->cb_lock);
- } else {
- /* same server */
- oldserver = NULL;
- }
- } else if (ret == -ENOENT) {
- /* the file was deleted - clear the callback timeout */
- oldserver = xchg(&vnode->cb_server, NULL);
- afs_kafstimod_del_timer(&vnode->cb_timeout);
+ clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ switch (ret) {
+ case 0:
+ afs_vnode_note_promise(vnode, server);
+ break;
+ case -ENOENT:
+ /* the file was deleted on the server */
_debug("got NOENT from server - marking file deleted");
- vnode->flags |= AFS_VNODE_DELETED;
+ afs_vnode_deleted_remotely(vnode);
+ break;
+ default:
+ break;
}
vnode->update_cnt--;
vnode->volume->vlocation->vldb.name,
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
- if (!(vnode->flags & AFS_VNODE_CHANGED) && vnode->cb_server) {
+ if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
+ vnode->cb_promised) {
_leave(" [unchanged]");
return 0;
}
- if (vnode->flags & AFS_VNODE_DELETED) {
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
_leave(" [deleted]");
return -ENOENT;
}
spin_lock(&vnode->lock);
- if (!(vnode->flags & AFS_VNODE_CHANGED)) {
+ if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
+ vnode->cb_promised) {
spin_unlock(&vnode->lock);
_leave(" [unchanged]");
return 0;
if (vnode->update_cnt > 0) {
/* someone else started a fetch */
set_current_state(TASK_UNINTERRUPTIBLE);
+ ASSERT(myself.func != NULL);
add_wait_queue(&vnode->update_waitq, &myself);
/* wait for the status to be updated */
for (;;) {
- if (!(vnode->flags & AFS_VNODE_CHANGED))
+ if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
break;
- if (vnode->flags & AFS_VNODE_DELETED)
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
break;
- /* it got updated and invalidated all before we saw
- * it */
+ /* check to see if it got updated and invalidated all
+ * before we saw it */
if (vnode->update_cnt == 0) {
remove_wait_queue(&vnode->update_waitq,
&myself);
spin_unlock(&vnode->lock);
set_current_state(TASK_RUNNING);
- return vnode->flags & AFS_VNODE_DELETED ? -ENOENT : 0;
+ return test_bit(AFS_VNODE_DELETED, &vnode->flags) ?
+ -ENOENT : 0;
}
get_anyway:
* vnode */
do {
/* pick a server to query */
- ret = afs_volume_pick_fileserver(vnode->volume, &server);
- if (ret<0)
- return ret;
+ server = afs_volume_pick_fileserver(vnode);
+ if (IS_ERR(server))
+ return PTR_ERR(server);
- _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
+ _debug("USING SERVER: %p{%08x}",
+ server, ntohl(server->addr.s_addr));
- ret = afs_rxfs_fetch_file_status(server, vnode, NULL);
+ ret = afs_fs_fetch_file_status(server, vnode, NULL,
+ &afs_sync_call);
- } while (!afs_volume_release_fileserver(vnode->volume, server, ret));
+ } while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
afs_vnode_finalise_status_update(vnode, server, ret);
* fetch file data from the volume
* - TODO implement caching and server failover
*/
-int afs_vnode_fetch_data(struct afs_vnode *vnode,
- struct afs_rxfs_fetch_descriptor *desc)
+int afs_vnode_fetch_data(struct afs_vnode *vnode, off_t offset, size_t length,
+ struct page *page)
{
struct afs_server *server;
int ret;
* vnode */
do {
/* pick a server to query */
- ret = afs_volume_pick_fileserver(vnode->volume, &server);
- if (ret < 0)
- return ret;
+ server = afs_volume_pick_fileserver(vnode);
+ if (IS_ERR(server))
+ return PTR_ERR(server);
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
- ret = afs_rxfs_fetch_file_data(server, vnode, desc, NULL);
+ ret = afs_fs_fetch_data(server, vnode, offset, length, page,
+ NULL, &afs_sync_call);
- } while (!afs_volume_release_fileserver(vnode->volume, server, ret));
+ } while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
afs_vnode_finalise_status_update(vnode, server, ret);
_leave(" = %d", ret);
return ret;
}
-
-/*
- * break any outstanding callback on a vnode
- * - only relevent to server that issued it
- */
-int afs_vnode_give_up_callback(struct afs_vnode *vnode)
-{
- struct afs_server *server;
- int ret;
-
- _enter("%s,{%u,%u,%u}",
- vnode->volume->vlocation->vldb.name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique);
-
- spin_lock(&afs_cb_hash_lock);
- list_del_init(&vnode->cb_hash_link);
- spin_unlock(&afs_cb_hash_lock);
-
- /* set the changed flag in the vnode and release the server */
- spin_lock(&vnode->lock);
-
- afs_kafstimod_del_timer(&vnode->cb_timeout);
-
- server = xchg(&vnode->cb_server, NULL);
- if (server) {
- vnode->flags |= AFS_VNODE_CHANGED;
-
- spin_lock(&server->cb_lock);
- list_del_init(&vnode->cb_link);
- spin_unlock(&server->cb_lock);
- }
-
- spin_unlock(&vnode->lock);
-
- ret = 0;
- if (server) {
- ret = afs_rxfs_give_up_callback(server, vnode);
- afs_put_server(server);
- }
-
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * match a vnode record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_vnode_cache_match(void *target,
- const void *entry)
-{
- const struct afs_cache_vnode *cvnode = entry;
- struct afs_vnode *vnode = target;
-
- _enter("{%x,%x,%Lx},{%x,%x,%Lx}",
- vnode->fid.vnode,
- vnode->fid.unique,
- vnode->status.version,
- cvnode->vnode_id,
- cvnode->vnode_unique,
- cvnode->data_version);
-
- if (vnode->fid.vnode != cvnode->vnode_id) {
- _leave(" = FAILED");
- return CACHEFS_MATCH_FAILED;
- }
-
- if (vnode->fid.unique != cvnode->vnode_unique ||
- vnode->status.version != cvnode->data_version) {
- _leave(" = DELETE");
- return CACHEFS_MATCH_SUCCESS_DELETE;
- }
-
- _leave(" = SUCCESS");
- return CACHEFS_MATCH_SUCCESS;
-}
-#endif
-
-/*
- * update a vnode record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static void afs_vnode_cache_update(void *source, void *entry)
-{
- struct afs_cache_vnode *cvnode = entry;
- struct afs_vnode *vnode = source;
-
- _enter("");
-
- cvnode->vnode_id = vnode->fid.vnode;
- cvnode->vnode_unique = vnode->fid.unique;
- cvnode->data_version = vnode->status.version;
-}
-#endif
+++ /dev/null
-/* AFS vnode record
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_VNODE_H
-#define AFS_VNODE_H
-
-#include <linux/fs.h>
-#include "server.h"
-#include "kafstimod.h"
-#include "cache.h"
-
-struct afs_rxfs_fetch_descriptor;
-
-extern struct afs_timer_ops afs_vnode_cb_timed_out_ops;
-
-/*
- * vnode catalogue entry
- */
-struct afs_cache_vnode {
- afs_vnodeid_t vnode_id; /* vnode ID */
- unsigned vnode_unique; /* vnode ID uniquifier */
- afs_dataversion_t data_version; /* data version */
-};
-
-#ifdef AFS_CACHING_SUPPORT
-extern struct cachefs_index_def afs_vnode_cache_index_def;
-#endif
-
-/*
- * AFS inode private data
- */
-struct afs_vnode {
- struct inode vfs_inode; /* the VFS's inode record */
-
- struct afs_volume *volume; /* volume on which vnode resides */
- struct afs_fid fid; /* the file identifier for this inode */
- struct afs_file_status status; /* AFS status info for this file */
-#ifdef AFS_CACHING_SUPPORT
- struct cachefs_cookie *cache; /* caching cookie */
-#endif
-
- wait_queue_head_t update_waitq; /* status fetch waitqueue */
- unsigned update_cnt; /* number of outstanding ops that will update the
- * status */
- spinlock_t lock; /* waitqueue/flags lock */
- unsigned flags;
-#define AFS_VNODE_CHANGED 0x00000001 /* set if vnode reported changed by callback */
-#define AFS_VNODE_DELETED 0x00000002 /* set if vnode deleted on server */
-#define AFS_VNODE_MOUNTPOINT 0x00000004 /* set if vnode is a mountpoint symlink */
-
- /* outstanding callback notification on this file */
- struct afs_server *cb_server; /* server that made the current promise */
- struct list_head cb_link; /* link in server's promises list */
- struct list_head cb_hash_link; /* link in master callback hash */
- struct afs_timer cb_timeout; /* timeout on promise */
- unsigned cb_version; /* callback version */
- unsigned cb_expiry; /* callback expiry time */
- afs_callback_type_t cb_type; /* type of callback */
-};
-
-static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
-{
- return container_of(inode, struct afs_vnode, vfs_inode);
-}
-
-static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
-{
- return &vnode->vfs_inode;
-}
-
-extern int afs_vnode_fetch_status(struct afs_vnode *);
-extern int afs_vnode_fetch_data(struct afs_vnode *,
- struct afs_rxfs_fetch_descriptor *);
-extern int afs_vnode_give_up_callback(struct afs_vnode *);
-
-#endif /* AFS_VNODE_H */
/* AFS volume management
*
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include "volume.h"
-#include "vnode.h"
-#include "cell.h"
-#include "cache.h"
-#include "cmservice.h"
-#include "fsclient.h"
-#include "vlclient.h"
#include "internal.h"
-#ifdef __KDEBUG
static const char *afs_voltypes[] = { "R/W", "R/O", "BAK" };
-#endif
-
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_volume_cache_match(void *target,
- const void *entry);
-static void afs_volume_cache_update(void *source, void *entry);
-
-struct cachefs_index_def afs_volume_cache_index_def = {
- .name = "volume",
- .data_size = sizeof(struct afs_cache_vhash),
- .keys[0] = { CACHEFS_INDEX_KEYS_BIN, 1 },
- .keys[1] = { CACHEFS_INDEX_KEYS_BIN, 1 },
- .match = afs_volume_cache_match,
- .update = afs_volume_cache_update,
-};
-#endif
/*
* lookup a volume by name
* - Rule 3: If parent volume is R/W, then only mount R/W volume unless
* explicitly told otherwise
*/
-int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
- struct afs_volume **_volume)
+struct afs_volume *afs_volume_lookup(const char *name, struct afs_cell *cell,
+ int rwpath)
{
struct afs_vlocation *vlocation = NULL;
struct afs_volume *volume = NULL;
+ struct afs_server *server = NULL;
afs_voltype_t type;
const char *cellname, *volname, *suffix;
char srvtmask;
if (!name || (name[0] != '%' && name[0] != '#') || !name[1]) {
printk("kAFS: unparsable volume name\n");
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}
/* determine the type of volume we're looking for */
/* lookup the cell record */
if (cellname || !cell) {
- ret = afs_cell_lookup(cellname, cellnamesz, &cell);
- if (ret<0) {
+ cell = afs_cell_lookup(cellname, cellnamesz);
+ if (IS_ERR(cell)) {
+ ret = PTR_ERR(cell);
printk("kAFS: unable to lookup cell '%s'\n",
cellname ?: "");
goto error;
}
/* lookup the volume location record */
- ret = afs_vlocation_lookup(cell, volname, volnamesz, &vlocation);
- if (ret < 0)
+ vlocation = afs_vlocation_lookup(cell, volname, volnamesz);
+ if (IS_ERR(vlocation)) {
+ ret = PTR_ERR(vlocation);
+ vlocation = NULL;
goto error;
+ }
/* make the final decision on the type we want */
ret = -ENOMEDIUM;
/* look up all the applicable server records */
for (loop = 0; loop < 8; loop++) {
if (vlocation->vldb.srvtmask[loop] & (1 << volume->type)) {
- ret = afs_server_lookup(
- volume->cell,
- &vlocation->vldb.servers[loop],
- &volume->servers[volume->nservers]);
- if (ret < 0)
+ server = afs_lookup_server(
+ volume->cell, &vlocation->vldb.servers[loop]);
+ if (IS_ERR(server)) {
+ ret = PTR_ERR(server);
goto error_discard;
+ }
+ volume->servers[volume->nservers] = server;
volume->nservers++;
}
}
success:
_debug("kAFS selected %s volume %08x",
afs_voltypes[volume->type], volume->vid);
- *_volume = volume;
- ret = 0;
+ up_write(&cell->vl_sem);
+ afs_put_vlocation(vlocation);
+ afs_put_cell(cell);
+ _leave(" = %p", volume);
+ return volume;
/* clean up */
error_up:
error:
afs_put_vlocation(vlocation);
afs_put_cell(cell);
-
- _leave(" = %d (%p)", ret, volume);
- return ret;
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
error_discard:
up_write(&cell->vl_sem);
_enter("%p", volume);
- vlocation = volume->vlocation;
+ ASSERTCMP(atomic_read(&volume->usage), >, 0);
- /* sanity check */
- BUG_ON(atomic_read(&volume->usage) <= 0);
+ vlocation = volume->vlocation;
/* to prevent a race, the decrement and the dequeue must be effectively
* atomic */
* pick a server to use to try accessing this volume
* - returns with an elevated usage count on the server chosen
*/
-int afs_volume_pick_fileserver(struct afs_volume *volume,
- struct afs_server **_server)
+struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *vnode)
{
+ struct afs_volume *volume = vnode->volume;
struct afs_server *server;
int ret, state, loop;
_enter("%s", volume->vlocation->vldb.name);
+ /* stick with the server we're already using if we can */
+ if (vnode->server && vnode->server->fs_state == 0) {
+ afs_get_server(vnode->server);
+ _leave(" = %p [current]", vnode->server);
+ return vnode->server;
+ }
+
down_read(&volume->server_sem);
/* handle the no-server case */
ret = volume->rjservers ? -ENOMEDIUM : -ESTALE;
up_read(&volume->server_sem);
_leave(" = %d [no servers]", ret);
- return ret;
+ return ERR_PTR(ret);
}
/* basically, just search the list for the first live server and use
server = volume->servers[loop];
state = server->fs_state;
+ _debug("consider %d [%d]", loop, state);
+
switch (state) {
/* found an apparently healthy server */
case 0:
afs_get_server(server);
up_read(&volume->server_sem);
- *_server = server;
- _leave(" = 0 (picked %08x)",
- ntohl(server->addr.s_addr));
- return 0;
+ _leave(" = %p (picked %08x)",
+ server, ntohl(server->addr.s_addr));
+ return server;
case -ENETUNREACH:
if (ret == 0)
*/
up_read(&volume->server_sem);
_leave(" = %d", ret);
- return ret;
+ return ERR_PTR(ret);
}
/*
* - records result of using a particular server to access a volume
* - return 0 to try again, 1 if okay or to issue error
*/
-int afs_volume_release_fileserver(struct afs_volume *volume,
+int afs_volume_release_fileserver(struct afs_vnode *vnode,
struct afs_server *server,
int result)
{
+ struct afs_volume *volume = vnode->volume;
unsigned loop;
_enter("%s,%08x,%d",
/* success */
case 0:
server->fs_act_jif = jiffies;
+ server->fs_state = 0;
break;
/* the fileserver denied all knowledge of the volume */
server->fs_act_jif = jiffies;
down_write(&volume->server_sem);
- /* first, find where the server is in the active list (if it
+ /* firstly, find where the server is in the active list (if it
* is) */
for (loop = 0; loop < volume->nservers; loop++)
if (volume->servers[loop] == server)
case -ENETUNREACH:
case -EHOSTUNREACH:
case -ECONNREFUSED:
+ case -ETIME:
case -ETIMEDOUT:
case -EREMOTEIO:
/* mark the server as dead
_leave(" [try next server]");
return 0;
}
-
-/*
- * match a volume hash record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static cachefs_match_val_t afs_volume_cache_match(void *target,
- const void *entry)
-{
- const struct afs_cache_vhash *vhash = entry;
- struct afs_volume *volume = target;
-
- _enter("{%u},{%u}", volume->type, vhash->vtype);
-
- if (volume->type == vhash->vtype) {
- _leave(" = SUCCESS");
- return CACHEFS_MATCH_SUCCESS;
- }
-
- _leave(" = FAILED");
- return CACHEFS_MATCH_FAILED;
-}
-#endif
-
-/*
- * update a volume hash record stored in the cache
- */
-#ifdef AFS_CACHING_SUPPORT
-static void afs_volume_cache_update(void *source, void *entry)
-{
- struct afs_cache_vhash *vhash = entry;
- struct afs_volume *volume = source;
-
- _enter("");
-
- vhash->vtype = volume->type;
-}
-#endif
+++ /dev/null
-/* AFS volume management
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef AFS_VOLUME_H
-#define AFS_VOLUME_H
-
-#include "types.h"
-#include "fsclient.h"
-#include "kafstimod.h"
-#include "kafsasyncd.h"
-#include "cache.h"
-
-typedef enum {
- AFS_VLUPD_SLEEP, /* sleeping waiting for update timer to fire */
- AFS_VLUPD_PENDING, /* on pending queue */
- AFS_VLUPD_INPROGRESS, /* op in progress */
- AFS_VLUPD_BUSYSLEEP, /* sleeping because server returned EBUSY */
-} __attribute__((packed)) afs_vlocation_upd_t;
-
-/*
- * entry in the cached volume location catalogue
- */
-struct afs_cache_vlocation {
- uint8_t name[64]; /* volume name (lowercase, padded with NULs) */
- uint8_t nservers; /* number of entries used in servers[] */
- uint8_t vidmask; /* voltype mask for vid[] */
- uint8_t srvtmask[8]; /* voltype masks for servers[] */
-#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
-#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
-#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
-
- afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
- struct in_addr servers[8]; /* fileserver addresses */
- time_t rtime; /* last retrieval time */
-};
-
-#ifdef AFS_CACHING_SUPPORT
-extern struct cachefs_index_def afs_vlocation_cache_index_def;
-#endif
-
-/*
- * volume -> vnode hash table entry
- */
-struct afs_cache_vhash {
- afs_voltype_t vtype; /* which volume variation */
- uint8_t hash_bucket; /* which hash bucket this represents */
-} __attribute__((packed));
-
-#ifdef AFS_CACHING_SUPPORT
-extern struct cachefs_index_def afs_volume_cache_index_def;
-#endif
-
-/*
- * AFS volume location record
- */
-struct afs_vlocation {
- atomic_t usage;
- struct list_head link; /* link in cell volume location list */
- struct afs_timer timeout; /* decaching timer */
- struct afs_cell *cell; /* cell to which volume belongs */
-#ifdef AFS_CACHING_SUPPORT
- struct cachefs_cookie *cache; /* caching cookie */
-#endif
- struct afs_cache_vlocation vldb; /* volume information DB record */
- struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
- rwlock_t lock; /* access lock */
- unsigned long read_jif; /* time at which last read from vlserver */
- struct afs_timer upd_timer; /* update timer */
- struct afs_async_op upd_op; /* update operation */
- afs_vlocation_upd_t upd_state; /* update state */
- unsigned short upd_first_svix; /* first server index during update */
- unsigned short upd_curr_svix; /* current server index during update */
- unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
- unsigned short upd_busy_cnt; /* EBUSY count during update */
- unsigned short valid; /* T if valid */
-};
-
-extern int afs_vlocation_lookup(struct afs_cell *, const char *, unsigned,
- struct afs_vlocation **);
-
-#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
-
-extern void afs_put_vlocation(struct afs_vlocation *);
-extern void afs_vlocation_do_timeout(struct afs_vlocation *);
-
-/*
- * AFS volume access record
- */
-struct afs_volume {
- atomic_t usage;
- struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
- struct afs_vlocation *vlocation; /* volume location */
-#ifdef AFS_CACHING_SUPPORT
- struct cachefs_cookie *cache; /* caching cookie */
-#endif
- afs_volid_t vid; /* volume ID */
- afs_voltype_t type; /* type of volume */
- char type_force; /* force volume type (suppress R/O -> R/W) */
- unsigned short nservers; /* number of server slots filled */
- unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
- struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
- struct rw_semaphore server_sem; /* lock for accessing current server */
-};
-
-extern int afs_volume_lookup(const char *, struct afs_cell *, int,
- struct afs_volume **);
-
-#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
-
-extern void afs_put_volume(struct afs_volume *);
-
-extern int afs_volume_pick_fileserver(struct afs_volume *,
- struct afs_server **);
-
-extern int afs_volume_release_fileserver(struct afs_volume *,
- struct afs_server *, int);
-
-#endif /* AFS_VOLUME_H */
projects / platform / kernel / linux-3.10.git / commitdiff