1 /* client.c: NFS client sharing and management code
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/addr.h>
24 #include <linux/sunrpc/clnt.h>
25 #include <linux/sunrpc/stats.h>
26 #include <linux/sunrpc/metrics.h>
27 #include <linux/sunrpc/xprtsock.h>
28 #include <linux/sunrpc/xprtrdma.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/in6.h>
38 #include <linux/slab.h>
39 #include <linux/idr.h>
41 #include <linux/nfs_xdr.h>
42 #include <linux/sunrpc/bc_xprt.h>
43 #include <linux/nsproxy.h>
44 #include <linux/pid_namespace.h>
49 #include "delegation.h"
57 #define NFSDBG_FACILITY NFSDBG_CLIENT
59 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
60 static DEFINE_SPINLOCK(nfs_version_lock);
61 static DEFINE_MUTEX(nfs_version_mutex);
62 static LIST_HEAD(nfs_versions);
67 static const struct rpc_version *nfs_version[5] = {
73 const struct rpc_program nfs_program = {
75 .number = NFS_PROGRAM,
76 .nrvers = ARRAY_SIZE(nfs_version),
77 .version = nfs_version,
78 .stats = &nfs_rpcstat,
79 .pipe_dir_name = NFS_PIPE_DIRNAME,
82 struct rpc_stat nfs_rpcstat = {
83 .program = &nfs_program
86 static struct nfs_subversion *find_nfs_version(unsigned int version)
88 struct nfs_subversion *nfs;
89 spin_lock(&nfs_version_lock);
91 list_for_each_entry(nfs, &nfs_versions, list) {
92 if (nfs->rpc_ops->version == version) {
93 spin_unlock(&nfs_version_lock);
98 spin_unlock(&nfs_version_lock);
99 return ERR_PTR(-EPROTONOSUPPORT);
102 struct nfs_subversion *get_nfs_version(unsigned int version)
104 struct nfs_subversion *nfs = find_nfs_version(version);
107 mutex_lock(&nfs_version_mutex);
108 request_module("nfsv%d", version);
109 nfs = find_nfs_version(version);
110 mutex_unlock(&nfs_version_mutex);
113 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
114 return ERR_PTR(-EAGAIN);
118 void put_nfs_version(struct nfs_subversion *nfs)
120 module_put(nfs->owner);
123 void register_nfs_version(struct nfs_subversion *nfs)
125 spin_lock(&nfs_version_lock);
127 list_add(&nfs->list, &nfs_versions);
128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
130 spin_unlock(&nfs_version_lock);
132 EXPORT_SYMBOL_GPL(register_nfs_version);
134 void unregister_nfs_version(struct nfs_subversion *nfs)
136 spin_lock(&nfs_version_lock);
138 nfs_version[nfs->rpc_ops->version] = NULL;
139 list_del(&nfs->list);
141 spin_unlock(&nfs_version_lock);
143 EXPORT_SYMBOL_GPL(unregister_nfs_version);
146 * Allocate a shared client record
148 * Since these are allocated/deallocated very rarely, we don't
149 * bother putting them in a slab cache...
151 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
153 struct nfs_client *clp;
156 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
159 clp->cl_nfs_mod = cl_init->nfs_mod;
160 if (!try_module_get(clp->cl_nfs_mod->owner))
163 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
165 refcount_set(&clp->cl_count, 1);
166 clp->cl_cons_state = NFS_CS_INITING;
168 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
169 clp->cl_addrlen = cl_init->addrlen;
171 if (cl_init->hostname) {
173 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
174 if (!clp->cl_hostname)
178 INIT_LIST_HEAD(&clp->cl_superblocks);
179 clp->cl_rpcclient = ERR_PTR(-EINVAL);
181 clp->cl_proto = cl_init->proto;
182 clp->cl_net = get_net(cl_init->net);
184 clp->cl_principal = "*";
185 nfs_fscache_get_client_cookie(clp);
190 put_nfs_version(clp->cl_nfs_mod);
196 EXPORT_SYMBOL_GPL(nfs_alloc_client);
198 #if IS_ENABLED(CONFIG_NFS_V4)
199 void nfs_cleanup_cb_ident_idr(struct net *net)
201 struct nfs_net *nn = net_generic(net, nfs_net_id);
203 idr_destroy(&nn->cb_ident_idr);
206 /* nfs_client_lock held */
207 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
209 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
211 if (clp->cl_cb_ident)
212 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
215 static void pnfs_init_server(struct nfs_server *server)
217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
221 void nfs_cleanup_cb_ident_idr(struct net *net)
225 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
229 static void pnfs_init_server(struct nfs_server *server)
233 #endif /* CONFIG_NFS_V4 */
236 * Destroy a shared client record
238 void nfs_free_client(struct nfs_client *clp)
240 nfs_fscache_release_client_cookie(clp);
242 /* -EIO all pending I/O */
243 if (!IS_ERR(clp->cl_rpcclient))
244 rpc_shutdown_client(clp->cl_rpcclient);
246 put_net(clp->cl_net);
247 put_nfs_version(clp->cl_nfs_mod);
248 kfree(clp->cl_hostname);
249 kfree(clp->cl_acceptor);
252 EXPORT_SYMBOL_GPL(nfs_free_client);
255 * Release a reference to a shared client record
257 void nfs_put_client(struct nfs_client *clp)
264 nn = net_generic(clp->cl_net, nfs_net_id);
266 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
267 list_del(&clp->cl_share_link);
268 nfs_cb_idr_remove_locked(clp);
269 spin_unlock(&nn->nfs_client_lock);
271 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
273 clp->rpc_ops->free_client(clp);
276 EXPORT_SYMBOL_GPL(nfs_put_client);
279 * Find an nfs_client on the list that matches the initialisation data
282 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
284 struct nfs_client *clp;
285 const struct sockaddr *sap = data->addr;
286 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
290 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
291 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
292 /* Don't match clients that failed to initialise properly */
293 if (clp->cl_cons_state < 0)
296 /* If a client is still initializing then we need to wait */
297 if (clp->cl_cons_state > NFS_CS_READY) {
298 refcount_inc(&clp->cl_count);
299 spin_unlock(&nn->nfs_client_lock);
300 error = nfs_wait_client_init_complete(clp);
302 spin_lock(&nn->nfs_client_lock);
304 return ERR_PTR(error);
308 /* Different NFS versions cannot share the same nfs_client */
309 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
312 if (clp->cl_proto != data->proto)
314 /* Match nfsv4 minorversion */
315 if (clp->cl_minorversion != data->minorversion)
317 /* Match the full socket address */
318 if (!rpc_cmp_addr_port(sap, clap))
319 /* Match all xprt_switch full socket addresses */
320 if (IS_ERR(clp->cl_rpcclient) ||
321 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
325 refcount_inc(&clp->cl_count);
332 * Return true if @clp is done initializing, false if still working on it.
334 * Use nfs_client_init_status to check if it was successful.
336 bool nfs_client_init_is_complete(const struct nfs_client *clp)
338 return clp->cl_cons_state <= NFS_CS_READY;
340 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
343 * Return 0 if @clp was successfully initialized, -errno otherwise.
345 * This must be called *after* nfs_client_init_is_complete() returns true,
346 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
348 int nfs_client_init_status(const struct nfs_client *clp)
350 /* called without checking nfs_client_init_is_complete */
351 if (clp->cl_cons_state > NFS_CS_READY) {
355 return clp->cl_cons_state;
357 EXPORT_SYMBOL_GPL(nfs_client_init_status);
359 int nfs_wait_client_init_complete(const struct nfs_client *clp)
361 return wait_event_killable(nfs_client_active_wq,
362 nfs_client_init_is_complete(clp));
364 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
367 * Found an existing client. Make sure it's ready before returning.
369 static struct nfs_client *
370 nfs_found_client(const struct nfs_client_initdata *cl_init,
371 struct nfs_client *clp)
375 error = nfs_wait_client_init_complete(clp);
378 return ERR_PTR(-ERESTARTSYS);
381 if (clp->cl_cons_state < NFS_CS_READY) {
382 error = clp->cl_cons_state;
384 return ERR_PTR(error);
392 * Look up a client by IP address and protocol version
393 * - creates a new record if one doesn't yet exist
395 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
397 struct nfs_client *clp, *new = NULL;
398 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
399 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
401 if (cl_init->hostname == NULL) {
406 /* see if the client already exists */
408 spin_lock(&nn->nfs_client_lock);
410 clp = nfs_match_client(cl_init);
412 spin_unlock(&nn->nfs_client_lock);
416 new->rpc_ops->free_client(new);
417 return nfs_found_client(cl_init, clp);
420 list_add_tail(&new->cl_share_link,
421 &nn->nfs_client_list);
422 spin_unlock(&nn->nfs_client_lock);
423 new->cl_flags = cl_init->init_flags;
424 return rpc_ops->init_client(new, cl_init);
427 spin_unlock(&nn->nfs_client_lock);
429 new = rpc_ops->alloc_client(cl_init);
430 } while (!IS_ERR(new));
434 EXPORT_SYMBOL_GPL(nfs_get_client);
437 * Mark a server as ready or failed
439 void nfs_mark_client_ready(struct nfs_client *clp, int state)
442 clp->cl_cons_state = state;
443 wake_up_all(&nfs_client_active_wq);
445 EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
448 * Initialise the timeout values for a connection
450 void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
451 int timeo, int retrans)
453 to->to_initval = timeo * HZ / 10;
454 to->to_retries = retrans;
457 case XPRT_TRANSPORT_TCP:
458 case XPRT_TRANSPORT_RDMA:
459 if (retrans == NFS_UNSPEC_RETRANS)
460 to->to_retries = NFS_DEF_TCP_RETRANS;
461 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
462 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
463 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
464 to->to_initval = NFS_MAX_TCP_TIMEOUT;
465 to->to_increment = to->to_initval;
466 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
467 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
468 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
469 if (to->to_maxval < to->to_initval)
470 to->to_maxval = to->to_initval;
471 to->to_exponential = 0;
473 case XPRT_TRANSPORT_UDP:
474 if (retrans == NFS_UNSPEC_RETRANS)
475 to->to_retries = NFS_DEF_UDP_RETRANS;
476 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
477 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
478 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
479 to->to_initval = NFS_MAX_UDP_TIMEOUT;
480 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
481 to->to_exponential = 1;
487 EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
490 * Create an RPC client handle
492 int nfs_create_rpc_client(struct nfs_client *clp,
493 const struct nfs_client_initdata *cl_init,
494 rpc_authflavor_t flavor)
496 struct rpc_clnt *clnt = NULL;
497 struct rpc_create_args args = {
499 .protocol = clp->cl_proto,
500 .address = (struct sockaddr *)&clp->cl_addr,
501 .addrsize = clp->cl_addrlen,
502 .timeout = cl_init->timeparms,
503 .servername = clp->cl_hostname,
504 .nodename = cl_init->nodename,
505 .program = &nfs_program,
506 .version = clp->rpc_ops->version,
507 .authflavor = flavor,
508 .cred = cl_init->cred,
511 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
512 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
513 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
514 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
515 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
516 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
517 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
518 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
520 if (!IS_ERR(clp->cl_rpcclient))
523 clnt = rpc_create(&args);
525 dprintk("%s: cannot create RPC client. Error = %ld\n",
526 __func__, PTR_ERR(clnt));
527 return PTR_ERR(clnt);
530 clnt->cl_principal = clp->cl_principal;
531 clp->cl_rpcclient = clnt;
534 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
537 * Version 2 or 3 client destruction
539 static void nfs_destroy_server(struct nfs_server *server)
541 if (server->nlm_host)
542 nlmclnt_done(server->nlm_host);
546 * Version 2 or 3 lockd setup
548 static int nfs_start_lockd(struct nfs_server *server)
550 struct nlm_host *host;
551 struct nfs_client *clp = server->nfs_client;
552 struct nlmclnt_initdata nlm_init = {
553 .hostname = clp->cl_hostname,
554 .address = (struct sockaddr *)&clp->cl_addr,
555 .addrlen = clp->cl_addrlen,
556 .nfs_version = clp->rpc_ops->version,
557 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
560 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
563 if (nlm_init.nfs_version > 3)
565 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
566 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
569 switch (clp->cl_proto) {
571 nlm_init.protocol = IPPROTO_TCP;
573 case XPRT_TRANSPORT_UDP:
574 nlm_init.protocol = IPPROTO_UDP;
577 host = nlmclnt_init(&nlm_init);
579 return PTR_ERR(host);
581 server->nlm_host = host;
582 server->destroy = nfs_destroy_server;
587 * Create a general RPC client
589 int nfs_init_server_rpcclient(struct nfs_server *server,
590 const struct rpc_timeout *timeo,
591 rpc_authflavor_t pseudoflavour)
593 struct nfs_client *clp = server->nfs_client;
595 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
597 if (IS_ERR(server->client)) {
598 dprintk("%s: couldn't create rpc_client!\n", __func__);
599 return PTR_ERR(server->client);
602 memcpy(&server->client->cl_timeout_default,
604 sizeof(server->client->cl_timeout_default));
605 server->client->cl_timeout = &server->client->cl_timeout_default;
606 server->client->cl_softrtry = 0;
607 if (server->flags & NFS_MOUNT_SOFTERR)
608 server->client->cl_softerr = 1;
609 if (server->flags & NFS_MOUNT_SOFT)
610 server->client->cl_softrtry = 1;
614 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
617 * nfs_init_client - Initialise an NFS2 or NFS3 client
619 * @clp: nfs_client to initialise
620 * @cl_init: Initialisation parameters
622 * Returns pointer to an NFS client, or an ERR_PTR value.
624 struct nfs_client *nfs_init_client(struct nfs_client *clp,
625 const struct nfs_client_initdata *cl_init)
629 /* the client is already initialised */
630 if (clp->cl_cons_state == NFS_CS_READY)
634 * Create a client RPC handle for doing FSSTAT with UNIX auth only
635 * - RFC 2623, sec 2.3.2
637 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
638 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
641 clp = ERR_PTR(error);
645 EXPORT_SYMBOL_GPL(nfs_init_client);
648 * Create a version 2 or 3 client
650 static int nfs_init_server(struct nfs_server *server,
651 const struct nfs_parsed_mount_data *data,
652 struct nfs_subversion *nfs_mod)
654 struct rpc_timeout timeparms;
655 struct nfs_client_initdata cl_init = {
656 .hostname = data->nfs_server.hostname,
657 .addr = (const struct sockaddr *)&data->nfs_server.address,
658 .addrlen = data->nfs_server.addrlen,
660 .proto = data->nfs_server.protocol,
662 .timeparms = &timeparms,
663 .cred = server->cred,
665 struct nfs_client *clp;
668 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
669 data->timeo, data->retrans);
670 if (data->flags & NFS_MOUNT_NORESVPORT)
671 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
673 /* Allocate or find a client reference we can use */
674 clp = nfs_get_client(&cl_init);
678 server->nfs_client = clp;
680 /* Initialise the client representation from the mount data */
681 server->flags = data->flags;
682 server->options = data->options;
683 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
684 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
685 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
688 server->rsize = nfs_block_size(data->rsize, NULL);
690 server->wsize = nfs_block_size(data->wsize, NULL);
692 server->acregmin = data->acregmin * HZ;
693 server->acregmax = data->acregmax * HZ;
694 server->acdirmin = data->acdirmin * HZ;
695 server->acdirmax = data->acdirmax * HZ;
697 /* Start lockd here, before we might error out */
698 error = nfs_start_lockd(server);
702 server->port = data->nfs_server.port;
703 server->auth_info = data->auth_info;
705 error = nfs_init_server_rpcclient(server, &timeparms,
706 data->selected_flavor);
710 /* Preserve the values of mount_server-related mount options */
711 if (data->mount_server.addrlen) {
712 memcpy(&server->mountd_address, &data->mount_server.address,
713 data->mount_server.addrlen);
714 server->mountd_addrlen = data->mount_server.addrlen;
716 server->mountd_version = data->mount_server.version;
717 server->mountd_port = data->mount_server.port;
718 server->mountd_protocol = data->mount_server.protocol;
720 server->namelen = data->namlen;
724 server->nfs_client = NULL;
730 * Load up the server record from information gained in an fsinfo record
732 static void nfs_server_set_fsinfo(struct nfs_server *server,
733 struct nfs_fsinfo *fsinfo)
735 unsigned long max_rpc_payload;
737 /* Work out a lot of parameters */
738 if (server->rsize == 0)
739 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
740 if (server->wsize == 0)
741 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
743 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
744 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
745 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
746 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
748 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
749 if (server->rsize > max_rpc_payload)
750 server->rsize = max_rpc_payload;
751 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
752 server->rsize = NFS_MAX_FILE_IO_SIZE;
753 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
755 if (server->wsize > max_rpc_payload)
756 server->wsize = max_rpc_payload;
757 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
758 server->wsize = NFS_MAX_FILE_IO_SIZE;
759 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
761 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
763 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
764 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
765 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
766 if (server->dtsize > server->rsize)
767 server->dtsize = server->rsize;
769 if (server->flags & NFS_MOUNT_NOAC) {
770 server->acregmin = server->acregmax = 0;
771 server->acdirmin = server->acdirmax = 0;
774 server->maxfilesize = fsinfo->maxfilesize;
776 server->time_delta = fsinfo->time_delta;
778 server->clone_blksize = fsinfo->clone_blksize;
779 /* We're airborne Set socket buffersize */
780 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
784 * Probe filesystem information, including the FSID on v2/v3
786 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
788 struct nfs_fsinfo fsinfo;
789 struct nfs_client *clp = server->nfs_client;
792 if (clp->rpc_ops->set_capabilities != NULL) {
793 error = clp->rpc_ops->set_capabilities(server, mntfh);
798 fsinfo.fattr = fattr;
799 fsinfo.nlayouttypes = 0;
800 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
801 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
805 nfs_server_set_fsinfo(server, &fsinfo);
807 /* Get some general file system info */
808 if (server->namelen == 0) {
809 struct nfs_pathconf pathinfo;
811 pathinfo.fattr = fattr;
812 nfs_fattr_init(fattr);
814 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
815 server->namelen = pathinfo.max_namelen;
820 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
823 * Copy useful information when duplicating a server record
825 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
827 target->flags = source->flags;
828 target->rsize = source->rsize;
829 target->wsize = source->wsize;
830 target->acregmin = source->acregmin;
831 target->acregmax = source->acregmax;
832 target->acdirmin = source->acdirmin;
833 target->acdirmax = source->acdirmax;
834 target->caps = source->caps;
835 target->options = source->options;
836 target->auth_info = source->auth_info;
837 target->port = source->port;
839 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
841 void nfs_server_insert_lists(struct nfs_server *server)
843 struct nfs_client *clp = server->nfs_client;
844 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
846 spin_lock(&nn->nfs_client_lock);
847 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
848 list_add_tail(&server->master_link, &nn->nfs_volume_list);
849 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
850 spin_unlock(&nn->nfs_client_lock);
853 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
855 void nfs_server_remove_lists(struct nfs_server *server)
857 struct nfs_client *clp = server->nfs_client;
862 nn = net_generic(clp->cl_net, nfs_net_id);
863 spin_lock(&nn->nfs_client_lock);
864 list_del_rcu(&server->client_link);
865 if (list_empty(&clp->cl_superblocks))
866 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
867 list_del(&server->master_link);
868 spin_unlock(&nn->nfs_client_lock);
872 EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
875 * Allocate and initialise a server record
877 struct nfs_server *nfs_alloc_server(void)
879 struct nfs_server *server;
881 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
885 server->client = server->client_acl = ERR_PTR(-EINVAL);
887 /* Zero out the NFS state stuff */
888 INIT_LIST_HEAD(&server->client_link);
889 INIT_LIST_HEAD(&server->master_link);
890 INIT_LIST_HEAD(&server->delegations);
891 INIT_LIST_HEAD(&server->layouts);
892 INIT_LIST_HEAD(&server->state_owners_lru);
893 INIT_LIST_HEAD(&server->ss_copies);
895 atomic_set(&server->active, 0);
897 server->io_stats = nfs_alloc_iostats();
898 if (!server->io_stats) {
903 ida_init(&server->openowner_id);
904 ida_init(&server->lockowner_id);
905 pnfs_init_server(server);
906 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
910 EXPORT_SYMBOL_GPL(nfs_alloc_server);
913 * Free up a server record
915 void nfs_free_server(struct nfs_server *server)
917 nfs_server_remove_lists(server);
919 if (server->destroy != NULL)
920 server->destroy(server);
922 if (!IS_ERR(server->client_acl))
923 rpc_shutdown_client(server->client_acl);
924 if (!IS_ERR(server->client))
925 rpc_shutdown_client(server->client);
927 nfs_put_client(server->nfs_client);
929 ida_destroy(&server->lockowner_id);
930 ida_destroy(&server->openowner_id);
931 nfs_free_iostats(server->io_stats);
932 put_cred(server->cred);
934 nfs_release_automount_timer();
936 EXPORT_SYMBOL_GPL(nfs_free_server);
939 * Create a version 2 or 3 volume record
940 * - keyed on server and FSID
942 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
943 struct nfs_subversion *nfs_mod)
945 struct nfs_server *server;
946 struct nfs_fattr *fattr;
949 server = nfs_alloc_server();
951 return ERR_PTR(-ENOMEM);
953 server->cred = get_cred(current_cred());
956 fattr = nfs_alloc_fattr();
960 /* Get a client representation */
961 error = nfs_init_server(server, mount_info->parsed, nfs_mod);
965 /* Probe the root fh to retrieve its FSID */
966 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
969 if (server->nfs_client->rpc_ops->version == 3) {
970 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
971 server->namelen = NFS3_MAXNAMLEN;
972 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
973 server->caps |= NFS_CAP_READDIRPLUS;
975 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
976 server->namelen = NFS2_MAXNAMLEN;
979 if (!(fattr->valid & NFS_ATTR_FATTR)) {
980 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh,
983 dprintk("nfs_create_server: getattr error = %d\n", -error);
987 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
989 dprintk("Server FSID: %llx:%llx\n",
990 (unsigned long long) server->fsid.major,
991 (unsigned long long) server->fsid.minor);
993 nfs_server_insert_lists(server);
994 server->mount_time = jiffies;
995 nfs_free_fattr(fattr);
999 nfs_free_fattr(fattr);
1000 nfs_free_server(server);
1001 return ERR_PTR(error);
1003 EXPORT_SYMBOL_GPL(nfs_create_server);
1006 * Clone an NFS2, NFS3 or NFS4 server record
1008 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1010 struct nfs_fattr *fattr,
1011 rpc_authflavor_t flavor)
1013 struct nfs_server *server;
1014 struct nfs_fattr *fattr_fsinfo;
1017 server = nfs_alloc_server();
1019 return ERR_PTR(-ENOMEM);
1021 server->cred = get_cred(source->cred);
1024 fattr_fsinfo = nfs_alloc_fattr();
1025 if (fattr_fsinfo == NULL)
1026 goto out_free_server;
1028 /* Copy data from the source */
1029 server->nfs_client = source->nfs_client;
1030 server->destroy = source->destroy;
1031 refcount_inc(&server->nfs_client->cl_count);
1032 nfs_server_copy_userdata(server, source);
1034 server->fsid = fattr->fsid;
1036 error = nfs_init_server_rpcclient(server,
1037 source->client->cl_timeout,
1040 goto out_free_server;
1042 /* probe the filesystem info for this server filesystem */
1043 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1045 goto out_free_server;
1047 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1048 server->namelen = NFS4_MAXNAMLEN;
1050 error = nfs_start_lockd(server);
1052 goto out_free_server;
1054 nfs_server_insert_lists(server);
1055 server->mount_time = jiffies;
1057 nfs_free_fattr(fattr_fsinfo);
1061 nfs_free_fattr(fattr_fsinfo);
1062 nfs_free_server(server);
1063 return ERR_PTR(error);
1065 EXPORT_SYMBOL_GPL(nfs_clone_server);
1067 void nfs_clients_init(struct net *net)
1069 struct nfs_net *nn = net_generic(net, nfs_net_id);
1071 INIT_LIST_HEAD(&nn->nfs_client_list);
1072 INIT_LIST_HEAD(&nn->nfs_volume_list);
1073 #if IS_ENABLED(CONFIG_NFS_V4)
1074 idr_init(&nn->cb_ident_idr);
1076 spin_lock_init(&nn->nfs_client_lock);
1077 nn->boot_time = ktime_get_real();
1080 #ifdef CONFIG_PROC_FS
1081 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1082 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1083 static void nfs_server_list_stop(struct seq_file *p, void *v);
1084 static int nfs_server_list_show(struct seq_file *m, void *v);
1086 static const struct seq_operations nfs_server_list_ops = {
1087 .start = nfs_server_list_start,
1088 .next = nfs_server_list_next,
1089 .stop = nfs_server_list_stop,
1090 .show = nfs_server_list_show,
1093 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1094 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1095 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1096 static int nfs_volume_list_show(struct seq_file *m, void *v);
1098 static const struct seq_operations nfs_volume_list_ops = {
1099 .start = nfs_volume_list_start,
1100 .next = nfs_volume_list_next,
1101 .stop = nfs_volume_list_stop,
1102 .show = nfs_volume_list_show,
1106 * set up the iterator to start reading from the server list and return the first item
1108 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1109 __acquires(&nn->nfs_client_lock)
1111 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1113 /* lock the list against modification */
1114 spin_lock(&nn->nfs_client_lock);
1115 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1119 * move to next server
1121 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1123 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1125 return seq_list_next(v, &nn->nfs_client_list, pos);
1129 * clean up after reading from the transports list
1131 static void nfs_server_list_stop(struct seq_file *p, void *v)
1132 __releases(&nn->nfs_client_lock)
1134 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1136 spin_unlock(&nn->nfs_client_lock);
1140 * display a header line followed by a load of call lines
1142 static int nfs_server_list_show(struct seq_file *m, void *v)
1144 struct nfs_client *clp;
1145 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1147 /* display header on line 1 */
1148 if (v == &nn->nfs_client_list) {
1149 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1153 /* display one transport per line on subsequent lines */
1154 clp = list_entry(v, struct nfs_client, cl_share_link);
1156 /* Check if the client is initialized */
1157 if (clp->cl_cons_state != NFS_CS_READY)
1161 seq_printf(m, "v%u %s %s %3d %s\n",
1162 clp->rpc_ops->version,
1163 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1164 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1165 refcount_read(&clp->cl_count),
1173 * set up the iterator to start reading from the volume list and return the first item
1175 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1176 __acquires(&nn->nfs_client_lock)
1178 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1180 /* lock the list against modification */
1181 spin_lock(&nn->nfs_client_lock);
1182 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1186 * move to next volume
1188 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1190 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1192 return seq_list_next(v, &nn->nfs_volume_list, pos);
1196 * clean up after reading from the transports list
1198 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1199 __releases(&nn->nfs_client_lock)
1201 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1203 spin_unlock(&nn->nfs_client_lock);
1207 * display a header line followed by a load of call lines
1209 static int nfs_volume_list_show(struct seq_file *m, void *v)
1211 struct nfs_server *server;
1212 struct nfs_client *clp;
1213 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1214 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1215 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1217 /* display header on line 1 */
1218 if (v == &nn->nfs_volume_list) {
1219 seq_puts(m, "NV SERVER PORT DEV FSID"
1223 /* display one transport per line on subsequent lines */
1224 server = list_entry(v, struct nfs_server, master_link);
1225 clp = server->nfs_client;
1227 snprintf(dev, sizeof(dev), "%u:%u",
1228 MAJOR(server->s_dev), MINOR(server->s_dev));
1230 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1231 (unsigned long long) server->fsid.major,
1232 (unsigned long long) server->fsid.minor);
1235 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1236 clp->rpc_ops->version,
1237 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1238 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1241 nfs_server_fscache_state(server));
1247 int nfs_fs_proc_net_init(struct net *net)
1249 struct nfs_net *nn = net_generic(net, nfs_net_id);
1250 struct proc_dir_entry *p;
1252 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1253 if (!nn->proc_nfsfs)
1256 /* a file of servers with which we're dealing */
1257 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1258 &nfs_server_list_ops, sizeof(struct seq_net_private));
1262 /* a file of volumes that we have mounted */
1263 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1264 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1270 remove_proc_subtree("nfsfs", net->proc_net);
1275 void nfs_fs_proc_net_exit(struct net *net)
1277 remove_proc_subtree("nfsfs", net->proc_net);
1281 * initialise the /proc/fs/nfsfs/ directory
1283 int __init nfs_fs_proc_init(void)
1285 if (!proc_mkdir("fs/nfsfs", NULL))
1288 /* a file of servers with which we're dealing */
1289 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1292 /* a file of volumes that we have mounted */
1293 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1298 remove_proc_subtree("fs/nfsfs", NULL);
1304 * clean up the /proc/fs/nfsfs/ directory
1306 void nfs_fs_proc_exit(void)
1308 remove_proc_subtree("fs/nfsfs", NULL);
1311 #endif /* CONFIG_PROC_FS */