2 * Copyright (c) 2004 The Regents of the University of Michigan.
3 * Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
6 * Andy Adamson <andros@citi.umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/file.h>
36 #include <linux/slab.h>
37 #include <linux/namei.h>
38 #include <linux/crypto.h>
39 #include <linux/sched.h>
41 #include <linux/module.h>
42 #include <net/net_namespace.h>
43 #include <linux/sunrpc/rpc_pipe_fs.h>
44 #include <linux/sunrpc/clnt.h>
45 #include <linux/nfsd/cld.h>
52 #define NFSDDBG_FACILITY NFSDDBG_PROC
55 struct nfsd4_client_tracking_ops {
56 int (*init)(struct net *);
57 void (*exit)(struct net *);
58 void (*create)(struct nfs4_client *);
59 void (*remove)(struct nfs4_client *);
60 int (*check)(struct nfs4_client *);
61 void (*grace_done)(struct nfsd_net *, time_t);
65 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
66 static struct nfsd4_client_tracking_ops *client_tracking_ops;
70 nfs4_save_creds(const struct cred **original_creds)
74 new = prepare_creds();
80 *original_creds = override_creds(new);
86 nfs4_reset_creds(const struct cred *original)
88 revert_creds(original);
92 md5_to_hex(char *out, char *md5)
96 for (i=0; i<16; i++) {
97 unsigned char c = md5[i];
99 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
100 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
106 nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
108 struct xdr_netobj cksum;
109 struct hash_desc desc;
110 struct scatterlist sg;
113 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
114 clname->len, clname->data);
115 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
116 desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
117 if (IS_ERR(desc.tfm)) {
118 status = PTR_ERR(desc.tfm);
122 cksum.len = crypto_hash_digestsize(desc.tfm);
123 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
124 if (cksum.data == NULL) {
129 sg_init_one(&sg, clname->data, clname->len);
131 status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data);
135 md5_to_hex(dname, cksum.data);
140 crypto_free_hash(desc.tfm);
146 * If we had an error generating the recdir name for the legacy tracker
147 * then warn the admin. If the error doesn't appear to be transient,
148 * then disable recovery tracking.
151 legacy_recdir_name_error(int error)
153 printk(KERN_ERR "NFSD: unable to generate recoverydir "
154 "name (%d).\n", error);
157 * if the algorithm just doesn't exist, then disable the recovery
158 * tracker altogether. The crypto libs will generally return this if
159 * FIPS is enabled as well.
161 if (error == -ENOENT) {
162 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
163 "Reboot recovery will not function correctly!\n");
165 /* the argument is ignored by the legacy exit function */
166 nfsd4_client_tracking_exit(NULL);
171 nfsd4_create_clid_dir(struct nfs4_client *clp)
173 const struct cred *original_cred;
174 char dname[HEXDIR_LEN];
175 struct dentry *dir, *dentry;
176 struct nfs4_client_reclaim *crp;
178 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
180 dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
182 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
187 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
189 return legacy_recdir_name_error(status);
191 status = nfs4_save_creds(&original_cred);
195 status = mnt_want_write_file(nn->rec_file);
199 dir = nn->rec_file->f_path.dentry;
200 /* lock the parent */
201 mutex_lock(&dir->d_inode->i_mutex);
203 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
204 if (IS_ERR(dentry)) {
205 status = PTR_ERR(dentry);
210 * In the 4.1 case, where we're called from
211 * reclaim_complete(), records from the previous reboot
212 * may still be left, so this is OK.
214 * In the 4.0 case, we should never get here; but we may
215 * as well be forgiving and just succeed silently.
218 status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
222 mutex_unlock(&dir->d_inode->i_mutex);
225 crp = nfs4_client_to_reclaim(dname, nn);
229 vfs_fsync(nn->rec_file, 0);
231 printk(KERN_ERR "NFSD: failed to write recovery record"
232 " (err %d); please check that %s exists"
233 " and is writeable", status,
234 user_recovery_dirname);
236 mnt_drop_write_file(nn->rec_file);
237 nfs4_reset_creds(original_cred);
240 typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
243 char name[HEXDIR_LEN];
244 struct list_head list;
248 nfsd4_build_namelist(void *arg, const char *name, int namlen,
249 loff_t offset, u64 ino, unsigned int d_type)
251 struct list_head *names = arg;
252 struct name_list *entry;
254 if (namlen != HEXDIR_LEN - 1)
256 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
259 memcpy(entry->name, name, HEXDIR_LEN - 1);
260 entry->name[HEXDIR_LEN - 1] = '\0';
261 list_add(&entry->list, names);
266 nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
268 const struct cred *original_cred;
269 struct dentry *dir = nn->rec_file->f_path.dentry;
273 status = nfs4_save_creds(&original_cred);
277 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
279 nfs4_reset_creds(original_cred);
283 status = vfs_readdir(nn->rec_file, nfsd4_build_namelist, &names);
284 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
285 while (!list_empty(&names)) {
286 struct name_list *entry;
287 entry = list_entry(names.next, struct name_list, list);
289 struct dentry *dentry;
290 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
291 if (IS_ERR(dentry)) {
292 status = PTR_ERR(dentry);
295 status = f(dir, dentry, nn);
298 list_del(&entry->list);
301 mutex_unlock(&dir->d_inode->i_mutex);
302 nfs4_reset_creds(original_cred);
307 nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
309 struct dentry *dir, *dentry;
312 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
314 dir = nn->rec_file->f_path.dentry;
315 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
316 dentry = lookup_one_len(name, dir, namlen);
317 if (IS_ERR(dentry)) {
318 status = PTR_ERR(dentry);
322 if (!dentry->d_inode)
324 status = vfs_rmdir(dir->d_inode, dentry);
328 mutex_unlock(&dir->d_inode->i_mutex);
333 nfsd4_remove_clid_dir(struct nfs4_client *clp)
335 const struct cred *original_cred;
336 struct nfs4_client_reclaim *crp;
337 char dname[HEXDIR_LEN];
339 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
341 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
344 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
346 return legacy_recdir_name_error(status);
348 status = mnt_want_write_file(nn->rec_file);
351 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
353 status = nfs4_save_creds(&original_cred);
357 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
358 nfs4_reset_creds(original_cred);
360 vfs_fsync(nn->rec_file, 0);
362 /* remove reclaim record */
363 crp = nfsd4_find_reclaim_client(dname, nn);
365 nfs4_remove_reclaim_record(crp, nn);
369 mnt_drop_write_file(nn->rec_file);
372 printk("NFSD: Failed to remove expired client state directory"
373 " %.*s\n", HEXDIR_LEN, dname);
377 purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
381 if (nfs4_has_reclaimed_state(child->d_name.name, nn))
384 status = vfs_rmdir(parent->d_inode, child);
386 printk("failed to remove client recovery directory %s\n",
388 /* Keep trying, success or failure: */
393 nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time)
400 status = mnt_want_write_file(nn->rec_file);
403 status = nfsd4_list_rec_dir(purge_old, nn);
405 vfs_fsync(nn->rec_file, 0);
406 mnt_drop_write_file(nn->rec_file);
408 nfs4_release_reclaim(nn);
410 printk("nfsd4: failed to purge old clients from recovery"
411 " directory %s\n", nn->rec_file->f_path.dentry->d_name.name);
415 load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
417 if (child->d_name.len != HEXDIR_LEN - 1) {
418 printk("nfsd4: illegal name %s in recovery directory\n",
420 /* Keep trying; maybe the others are OK: */
423 nfs4_client_to_reclaim(child->d_name.name, nn);
428 nfsd4_recdir_load(struct net *net) {
430 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
435 status = nfsd4_list_rec_dir(load_recdir, nn);
437 printk("nfsd4: failed loading clients from recovery"
438 " directory %s\n", nn->rec_file->f_path.dentry->d_name.name);
443 * Hold reference to the recovery directory.
447 nfsd4_init_recdir(struct net *net)
449 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
450 const struct cred *original_cred;
453 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
454 user_recovery_dirname);
456 BUG_ON(nn->rec_file);
458 status = nfs4_save_creds(&original_cred);
460 printk("NFSD: Unable to change credentials to find recovery"
461 " directory: error %d\n",
466 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
467 if (IS_ERR(nn->rec_file)) {
468 printk("NFSD: unable to find recovery directory %s\n",
469 user_recovery_dirname);
470 status = PTR_ERR(nn->rec_file);
474 nfs4_reset_creds(original_cred);
482 nfs4_legacy_state_init(struct net *net)
484 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
487 nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
488 CLIENT_HASH_SIZE, GFP_KERNEL);
489 if (!nn->reclaim_str_hashtbl)
492 for (i = 0; i < CLIENT_HASH_SIZE; i++)
493 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
494 nn->reclaim_str_hashtbl_size = 0;
500 nfs4_legacy_state_shutdown(struct net *net)
502 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
504 kfree(nn->reclaim_str_hashtbl);
508 nfsd4_load_reboot_recovery_data(struct net *net)
512 status = nfsd4_init_recdir(net);
514 status = nfsd4_recdir_load(net);
516 printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
521 nfsd4_legacy_tracking_init(struct net *net)
525 /* XXX: The legacy code won't work in a container */
526 if (net != &init_net) {
527 WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
528 "tracking in a container!\n");
532 status = nfs4_legacy_state_init(net);
536 status = nfsd4_load_reboot_recovery_data(net);
542 nfs4_legacy_state_shutdown(net);
547 nfsd4_shutdown_recdir(struct nfsd_net *nn)
556 nfsd4_legacy_tracking_exit(struct net *net)
558 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
560 nfs4_release_reclaim(nn);
561 nfsd4_shutdown_recdir(nn);
562 nfs4_legacy_state_shutdown(net);
566 * Change the NFSv4 recovery directory to recdir.
569 nfs4_reset_recoverydir(char *recdir)
574 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
578 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
579 strcpy(user_recovery_dirname, recdir);
587 nfs4_recoverydir(void)
589 return user_recovery_dirname;
593 nfsd4_check_legacy_client(struct nfs4_client *clp)
596 char dname[HEXDIR_LEN];
597 struct nfs4_client_reclaim *crp;
598 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
600 /* did we already find that this client is stable? */
601 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
604 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
606 legacy_recdir_name_error(status);
610 /* look for it in the reclaim hashtable otherwise */
611 crp = nfsd4_find_reclaim_client(dname, nn);
613 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
621 static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
622 .init = nfsd4_legacy_tracking_init,
623 .exit = nfsd4_legacy_tracking_exit,
624 .create = nfsd4_create_clid_dir,
625 .remove = nfsd4_remove_clid_dir,
626 .check = nfsd4_check_legacy_client,
627 .grace_done = nfsd4_recdir_purge_old,
631 #define NFSD_PIPE_DIR "nfsd"
632 #define NFSD_CLD_PIPE "cld"
634 /* per-net-ns structure for holding cld upcall info */
636 struct rpc_pipe *cn_pipe;
638 struct list_head cn_list;
643 struct list_head cu_list;
644 struct cld_net *cu_net;
645 struct task_struct *cu_task;
646 struct cld_msg cu_msg;
650 __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
653 struct rpc_pipe_msg msg;
655 memset(&msg, 0, sizeof(msg));
657 msg.len = sizeof(*cmsg);
660 * Set task state before we queue the upcall. That prevents
661 * wake_up_process in the downcall from racing with schedule.
663 set_current_state(TASK_UNINTERRUPTIBLE);
664 ret = rpc_queue_upcall(pipe, &msg);
666 set_current_state(TASK_RUNNING);
671 set_current_state(TASK_RUNNING);
680 cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
685 * -EAGAIN occurs when pipe is closed and reopened while there are
689 ret = __cld_pipe_upcall(pipe, cmsg);
690 } while (ret == -EAGAIN);
696 cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
698 struct cld_upcall *tmp, *cup;
699 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
701 struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
703 struct cld_net *cn = nn->cld_net;
705 if (mlen != sizeof(*cmsg)) {
706 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
711 /* copy just the xid so we can try to find that */
712 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
713 dprintk("%s: error when copying xid from userspace", __func__);
717 /* walk the list and find corresponding xid */
719 spin_lock(&cn->cn_lock);
720 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
721 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
723 list_del_init(&cup->cu_list);
727 spin_unlock(&cn->cn_lock);
729 /* couldn't find upcall? */
731 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
735 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
738 wake_up_process(cup->cu_task);
743 cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
745 struct cld_msg *cmsg = msg->data;
746 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
749 /* errno >= 0 means we got a downcall */
753 wake_up_process(cup->cu_task);
756 static const struct rpc_pipe_ops cld_upcall_ops = {
757 .upcall = rpc_pipe_generic_upcall,
758 .downcall = cld_pipe_downcall,
759 .destroy_msg = cld_pipe_destroy_msg,
762 static struct dentry *
763 nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
765 struct dentry *dir, *dentry;
767 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
769 return ERR_PTR(-ENOENT);
770 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
776 nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
779 rpc_unlink(pipe->dentry);
782 static struct dentry *
783 nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
785 struct super_block *sb;
786 struct dentry *dentry;
788 sb = rpc_get_sb_net(net);
791 dentry = nfsd4_cld_register_sb(sb, pipe);
797 nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
799 struct super_block *sb;
801 sb = rpc_get_sb_net(net);
803 nfsd4_cld_unregister_sb(pipe);
808 /* Initialize rpc_pipefs pipe for communication with client tracking daemon */
810 nfsd4_init_cld_pipe(struct net *net)
813 struct dentry *dentry;
814 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
820 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
826 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
827 if (IS_ERR(cn->cn_pipe)) {
828 ret = PTR_ERR(cn->cn_pipe);
831 spin_lock_init(&cn->cn_lock);
832 INIT_LIST_HEAD(&cn->cn_list);
834 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
835 if (IS_ERR(dentry)) {
836 ret = PTR_ERR(dentry);
837 goto err_destroy_data;
840 cn->cn_pipe->dentry = dentry;
845 rpc_destroy_pipe_data(cn->cn_pipe);
848 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
854 nfsd4_remove_cld_pipe(struct net *net)
856 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
857 struct cld_net *cn = nn->cld_net;
859 nfsd4_cld_unregister_net(net, cn->cn_pipe);
860 rpc_destroy_pipe_data(cn->cn_pipe);
865 static struct cld_upcall *
866 alloc_cld_upcall(struct cld_net *cn)
868 struct cld_upcall *new, *tmp;
870 new = kzalloc(sizeof(*new), GFP_KERNEL);
874 /* FIXME: hard cap on number in flight? */
876 spin_lock(&cn->cn_lock);
877 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
878 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
880 spin_unlock(&cn->cn_lock);
884 new->cu_task = current;
885 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
886 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
888 list_add(&new->cu_list, &cn->cn_list);
889 spin_unlock(&cn->cn_lock);
891 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
897 free_cld_upcall(struct cld_upcall *victim)
899 struct cld_net *cn = victim->cu_net;
901 spin_lock(&cn->cn_lock);
902 list_del(&victim->cu_list);
903 spin_unlock(&cn->cn_lock);
907 /* Ask daemon to create a new record */
909 nfsd4_cld_create(struct nfs4_client *clp)
912 struct cld_upcall *cup;
913 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
914 struct cld_net *cn = nn->cld_net;
916 /* Don't upcall if it's already stored */
917 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
920 cup = alloc_cld_upcall(cn);
926 cup->cu_msg.cm_cmd = Cld_Create;
927 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
928 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
931 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
933 ret = cup->cu_msg.cm_status;
934 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
937 free_cld_upcall(cup);
940 printk(KERN_ERR "NFSD: Unable to create client "
941 "record on stable storage: %d\n", ret);
944 /* Ask daemon to create a new record */
946 nfsd4_cld_remove(struct nfs4_client *clp)
949 struct cld_upcall *cup;
950 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
951 struct cld_net *cn = nn->cld_net;
953 /* Don't upcall if it's already removed */
954 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
957 cup = alloc_cld_upcall(cn);
963 cup->cu_msg.cm_cmd = Cld_Remove;
964 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
965 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
968 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
970 ret = cup->cu_msg.cm_status;
971 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
974 free_cld_upcall(cup);
977 printk(KERN_ERR "NFSD: Unable to remove client "
978 "record from stable storage: %d\n", ret);
981 /* Check for presence of a record, and update its timestamp */
983 nfsd4_cld_check(struct nfs4_client *clp)
986 struct cld_upcall *cup;
987 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
988 struct cld_net *cn = nn->cld_net;
990 /* Don't upcall if one was already stored during this grace pd */
991 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
994 cup = alloc_cld_upcall(cn);
996 printk(KERN_ERR "NFSD: Unable to check client record on "
997 "stable storage: %d\n", -ENOMEM);
1001 cup->cu_msg.cm_cmd = Cld_Check;
1002 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1003 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1006 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1008 ret = cup->cu_msg.cm_status;
1009 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1012 free_cld_upcall(cup);
1017 nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time)
1020 struct cld_upcall *cup;
1021 struct cld_net *cn = nn->cld_net;
1023 cup = alloc_cld_upcall(cn);
1029 cup->cu_msg.cm_cmd = Cld_GraceDone;
1030 cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
1031 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1033 ret = cup->cu_msg.cm_status;
1035 free_cld_upcall(cup);
1038 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1041 static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1042 .init = nfsd4_init_cld_pipe,
1043 .exit = nfsd4_remove_cld_pipe,
1044 .create = nfsd4_cld_create,
1045 .remove = nfsd4_cld_remove,
1046 .check = nfsd4_cld_check,
1047 .grace_done = nfsd4_cld_grace_done,
1050 /* upcall via usermodehelper */
1051 static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1052 module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1054 MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1056 static bool cltrack_legacy_disable;
1057 module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1058 MODULE_PARM_DESC(cltrack_legacy_disable,
1059 "Disable legacy recoverydir conversion. Default: false");
1061 #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1062 #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1065 nfsd4_cltrack_legacy_topdir(void)
1071 if (cltrack_legacy_disable)
1074 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1075 strlen(nfs4_recoverydir()) + 1;
1077 result = kmalloc(len, GFP_KERNEL);
1081 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1082 nfs4_recoverydir());
1083 if (copied >= len) {
1084 /* just return nothing if output was truncated */
1093 nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1099 if (cltrack_legacy_disable)
1102 /* +1 is for '/' between "topdir" and "recdir" */
1103 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1104 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1106 result = kmalloc(len, GFP_KERNEL);
1110 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1111 nfs4_recoverydir());
1112 if (copied > (len - HEXDIR_LEN)) {
1113 /* just return nothing if output will be truncated */
1118 copied = nfs4_make_rec_clidname(result + copied, name);
1128 nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy)
1134 if (unlikely(!cltrack_prog[0])) {
1135 dprintk("%s: cltrack_prog is disabled\n", __func__);
1139 dprintk("%s: cmd: %s\n", __func__, cmd);
1140 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1141 dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)");
1146 argv[0] = (char *)cltrack_prog;
1151 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1153 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1154 * error. The admin can re-enable it on the fly by using sysfs
1155 * once the problem has been fixed.
1157 if (ret == -ENOENT || ret == -EACCES) {
1158 dprintk("NFSD: %s was not found or isn't executable (%d). "
1159 "Setting cltrack_prog to blank string!",
1161 cltrack_prog[0] = '\0';
1163 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1169 bin_to_hex_dup(const unsigned char *src, int srclen)
1174 /* +1 for terminating NULL */
1175 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1180 for (i = 0; i < srclen; i++) {
1181 sprintf(hex, "%2.2x", *src++);
1188 nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net)
1190 return nfsd4_umh_cltrack_upcall("init", NULL, NULL);
1194 nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1198 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1200 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1203 nfsd4_umh_cltrack_upcall("create", hexid, NULL);
1208 nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1212 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1214 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1217 nfsd4_umh_cltrack_upcall("remove", hexid, NULL);
1222 nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1225 char *hexid, *legacy;
1227 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1229 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1232 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1233 ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy);
1240 nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn,
1244 char timestr[22]; /* FIXME: better way to determine max size? */
1246 sprintf(timestr, "%ld", boot_time);
1247 legacy = nfsd4_cltrack_legacy_topdir();
1248 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy);
1252 static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1253 .init = nfsd4_umh_cltrack_init,
1255 .create = nfsd4_umh_cltrack_create,
1256 .remove = nfsd4_umh_cltrack_remove,
1257 .check = nfsd4_umh_cltrack_check,
1258 .grace_done = nfsd4_umh_cltrack_grace_done,
1262 nfsd4_client_tracking_init(struct net *net)
1267 /* just run the init if it the method is already decided */
1268 if (client_tracking_ops)
1272 * First, try a UMH upcall. It should succeed or fail quickly, so
1273 * there's little harm in trying that first.
1275 client_tracking_ops = &nfsd4_umh_tracking_ops;
1276 status = client_tracking_ops->init(net);
1281 * See if the recoverydir exists and is a directory. If it is,
1282 * then use the legacy ops.
1284 client_tracking_ops = &nfsd4_legacy_tracking_ops;
1285 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1287 status = S_ISDIR(path.dentry->d_inode->i_mode);
1293 /* Finally, try to use nfsdcld */
1294 client_tracking_ops = &nfsd4_cld_tracking_ops;
1295 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1296 "removed in 3.10. Please transition to using "
1299 status = client_tracking_ops->init(net);
1301 printk(KERN_WARNING "NFSD: Unable to initialize client "
1302 "recovery tracking! (%d)\n", status);
1303 client_tracking_ops = NULL;
1309 nfsd4_client_tracking_exit(struct net *net)
1311 if (client_tracking_ops) {
1312 if (client_tracking_ops->exit)
1313 client_tracking_ops->exit(net);
1314 client_tracking_ops = NULL;
1319 nfsd4_client_record_create(struct nfs4_client *clp)
1321 if (client_tracking_ops)
1322 client_tracking_ops->create(clp);
1326 nfsd4_client_record_remove(struct nfs4_client *clp)
1328 if (client_tracking_ops)
1329 client_tracking_ops->remove(clp);
1333 nfsd4_client_record_check(struct nfs4_client *clp)
1335 if (client_tracking_ops)
1336 return client_tracking_ops->check(clp);
1342 nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
1344 if (client_tracking_ops)
1345 client_tracking_ops->grace_done(nn, boot_time);
1349 rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1351 struct super_block *sb = ptr;
1352 struct net *net = sb->s_fs_info;
1353 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1354 struct cld_net *cn = nn->cld_net;
1355 struct dentry *dentry;
1358 if (!try_module_get(THIS_MODULE))
1362 module_put(THIS_MODULE);
1367 case RPC_PIPEFS_MOUNT:
1368 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1369 if (IS_ERR(dentry)) {
1370 ret = PTR_ERR(dentry);
1373 cn->cn_pipe->dentry = dentry;
1375 case RPC_PIPEFS_UMOUNT:
1376 if (cn->cn_pipe->dentry)
1377 nfsd4_cld_unregister_sb(cn->cn_pipe);
1383 module_put(THIS_MODULE);
1387 static struct notifier_block nfsd4_cld_block = {
1388 .notifier_call = rpc_pipefs_event,
1392 register_cld_notifier(void)
1394 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1398 unregister_cld_notifier(void)
1400 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);