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 net *, time_t);
65 static struct file *rec_file;
66 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
67 static struct nfsd4_client_tracking_ops *client_tracking_ops;
71 nfs4_save_creds(const struct cred **original_creds)
75 new = prepare_creds();
81 *original_creds = override_creds(new);
87 nfs4_reset_creds(const struct cred *original)
89 revert_creds(original);
93 md5_to_hex(char *out, char *md5)
97 for (i=0; i<16; i++) {
98 unsigned char c = md5[i];
100 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
101 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
107 nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
109 struct xdr_netobj cksum;
110 struct hash_desc desc;
111 struct scatterlist sg;
114 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
115 clname->len, clname->data);
116 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
117 desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
118 if (IS_ERR(desc.tfm)) {
119 status = PTR_ERR(desc.tfm);
123 cksum.len = crypto_hash_digestsize(desc.tfm);
124 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
125 if (cksum.data == NULL) {
130 sg_init_one(&sg, clname->data, clname->len);
132 status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data);
136 md5_to_hex(dname, cksum.data);
141 crypto_free_hash(desc.tfm);
147 * If we had an error generating the recdir name for the legacy tracker
148 * then warn the admin. If the error doesn't appear to be transient,
149 * then disable recovery tracking.
152 legacy_recdir_name_error(int error)
154 printk(KERN_ERR "NFSD: unable to generate recoverydir "
155 "name (%d).\n", error);
158 * if the algorithm just doesn't exist, then disable the recovery
159 * tracker altogether. The crypto libs will generally return this if
160 * FIPS is enabled as well.
162 if (error == -ENOENT) {
163 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
164 "Reboot recovery will not function correctly!\n");
166 /* the argument is ignored by the legacy exit function */
167 nfsd4_client_tracking_exit(NULL);
172 nfsd4_create_clid_dir(struct nfs4_client *clp)
174 const struct cred *original_cred;
175 char dname[HEXDIR_LEN];
176 struct dentry *dir, *dentry;
177 struct nfs4_client_reclaim *crp;
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(rec_file);
199 dir = 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);
229 vfs_fsync(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(rec_file);
237 nfs4_reset_creds(original_cred);
240 typedef int (recdir_func)(struct dentry *, struct dentry *);
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)
268 const struct cred *original_cred;
269 struct dentry *dir = rec_file->f_path.dentry;
273 status = nfs4_save_creds(&original_cred);
277 status = vfs_llseek(rec_file, 0, SEEK_SET);
279 nfs4_reset_creds(original_cred);
283 status = vfs_readdir(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);
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)
309 struct dentry *dir, *dentry;
312 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
314 dir = 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];
340 if (!rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
343 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
345 return legacy_recdir_name_error(status);
347 status = mnt_want_write_file(rec_file);
350 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
352 status = nfs4_save_creds(&original_cred);
356 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1);
357 nfs4_reset_creds(original_cred);
359 vfs_fsync(rec_file, 0);
361 /* remove reclaim record */
362 crp = nfsd4_find_reclaim_client(dname);
364 nfs4_remove_reclaim_record(crp);
368 mnt_drop_write_file(rec_file);
371 printk("NFSD: Failed to remove expired client state directory"
372 " %.*s\n", HEXDIR_LEN, dname);
376 purge_old(struct dentry *parent, struct dentry *child)
380 if (nfs4_has_reclaimed_state(child->d_name.name))
383 status = vfs_rmdir(parent->d_inode, child);
385 printk("failed to remove client recovery directory %s\n",
387 /* Keep trying, success or failure: */
392 nfsd4_recdir_purge_old(struct net *net, time_t boot_time)
399 status = mnt_want_write_file(rec_file);
402 status = nfsd4_list_rec_dir(purge_old);
404 vfs_fsync(rec_file, 0);
405 mnt_drop_write_file(rec_file);
408 printk("nfsd4: failed to purge old clients from recovery"
409 " directory %s\n", rec_file->f_path.dentry->d_name.name);
413 load_recdir(struct dentry *parent, struct dentry *child)
415 if (child->d_name.len != HEXDIR_LEN - 1) {
416 printk("nfsd4: illegal name %s in recovery directory\n",
418 /* Keep trying; maybe the others are OK: */
421 nfs4_client_to_reclaim(child->d_name.name);
426 nfsd4_recdir_load(void) {
432 status = nfsd4_list_rec_dir(load_recdir);
434 printk("nfsd4: failed loading clients from recovery"
435 " directory %s\n", rec_file->f_path.dentry->d_name.name);
440 * Hold reference to the recovery directory.
444 nfsd4_init_recdir(void)
446 const struct cred *original_cred;
449 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
450 user_recovery_dirname);
454 status = nfs4_save_creds(&original_cred);
456 printk("NFSD: Unable to change credentials to find recovery"
457 " directory: error %d\n",
462 rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
463 if (IS_ERR(rec_file)) {
464 printk("NFSD: unable to find recovery directory %s\n",
465 user_recovery_dirname);
466 status = PTR_ERR(rec_file);
470 nfs4_reset_creds(original_cred);
477 nfsd4_load_reboot_recovery_data(struct net *net)
481 /* XXX: The legacy code won't work in a container */
482 if (net != &init_net) {
483 WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
484 "tracking in a container!\n");
489 status = nfsd4_init_recdir();
491 status = nfsd4_recdir_load();
494 printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
499 nfsd4_shutdown_recdir(void)
508 nfsd4_legacy_tracking_exit(struct net *net)
510 nfs4_release_reclaim();
511 nfsd4_shutdown_recdir();
515 * Change the NFSv4 recovery directory to recdir.
518 nfs4_reset_recoverydir(char *recdir)
523 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
527 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
528 strcpy(user_recovery_dirname, recdir);
536 nfs4_recoverydir(void)
538 return user_recovery_dirname;
542 nfsd4_check_legacy_client(struct nfs4_client *clp)
545 char dname[HEXDIR_LEN];
546 struct nfs4_client_reclaim *crp;
548 /* did we already find that this client is stable? */
549 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
552 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
554 legacy_recdir_name_error(status);
558 /* look for it in the reclaim hashtable otherwise */
559 crp = nfsd4_find_reclaim_client(dname);
561 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
569 static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
570 .init = nfsd4_load_reboot_recovery_data,
571 .exit = nfsd4_legacy_tracking_exit,
572 .create = nfsd4_create_clid_dir,
573 .remove = nfsd4_remove_clid_dir,
574 .check = nfsd4_check_legacy_client,
575 .grace_done = nfsd4_recdir_purge_old,
579 #define NFSD_PIPE_DIR "nfsd"
580 #define NFSD_CLD_PIPE "cld"
582 /* per-net-ns structure for holding cld upcall info */
584 struct rpc_pipe *cn_pipe;
586 struct list_head cn_list;
591 struct list_head cu_list;
592 struct cld_net *cu_net;
593 struct task_struct *cu_task;
594 struct cld_msg cu_msg;
598 __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
601 struct rpc_pipe_msg msg;
603 memset(&msg, 0, sizeof(msg));
605 msg.len = sizeof(*cmsg);
608 * Set task state before we queue the upcall. That prevents
609 * wake_up_process in the downcall from racing with schedule.
611 set_current_state(TASK_UNINTERRUPTIBLE);
612 ret = rpc_queue_upcall(pipe, &msg);
614 set_current_state(TASK_RUNNING);
619 set_current_state(TASK_RUNNING);
628 cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
633 * -EAGAIN occurs when pipe is closed and reopened while there are
637 ret = __cld_pipe_upcall(pipe, cmsg);
638 } while (ret == -EAGAIN);
644 cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
646 struct cld_upcall *tmp, *cup;
647 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
649 struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
651 struct cld_net *cn = nn->cld_net;
653 if (mlen != sizeof(*cmsg)) {
654 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
659 /* copy just the xid so we can try to find that */
660 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
661 dprintk("%s: error when copying xid from userspace", __func__);
665 /* walk the list and find corresponding xid */
667 spin_lock(&cn->cn_lock);
668 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
669 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
671 list_del_init(&cup->cu_list);
675 spin_unlock(&cn->cn_lock);
677 /* couldn't find upcall? */
679 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
683 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
686 wake_up_process(cup->cu_task);
691 cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
693 struct cld_msg *cmsg = msg->data;
694 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
697 /* errno >= 0 means we got a downcall */
701 wake_up_process(cup->cu_task);
704 static const struct rpc_pipe_ops cld_upcall_ops = {
705 .upcall = rpc_pipe_generic_upcall,
706 .downcall = cld_pipe_downcall,
707 .destroy_msg = cld_pipe_destroy_msg,
710 static struct dentry *
711 nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
713 struct dentry *dir, *dentry;
715 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
717 return ERR_PTR(-ENOENT);
718 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
724 nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
727 rpc_unlink(pipe->dentry);
730 static struct dentry *
731 nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
733 struct super_block *sb;
734 struct dentry *dentry;
736 sb = rpc_get_sb_net(net);
739 dentry = nfsd4_cld_register_sb(sb, pipe);
745 nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
747 struct super_block *sb;
749 sb = rpc_get_sb_net(net);
751 nfsd4_cld_unregister_sb(pipe);
756 /* Initialize rpc_pipefs pipe for communication with client tracking daemon */
758 nfsd4_init_cld_pipe(struct net *net)
761 struct dentry *dentry;
762 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
768 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
774 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
775 if (IS_ERR(cn->cn_pipe)) {
776 ret = PTR_ERR(cn->cn_pipe);
779 spin_lock_init(&cn->cn_lock);
780 INIT_LIST_HEAD(&cn->cn_list);
782 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
783 if (IS_ERR(dentry)) {
784 ret = PTR_ERR(dentry);
785 goto err_destroy_data;
788 cn->cn_pipe->dentry = dentry;
793 rpc_destroy_pipe_data(cn->cn_pipe);
796 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
802 nfsd4_remove_cld_pipe(struct net *net)
804 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
805 struct cld_net *cn = nn->cld_net;
807 nfsd4_cld_unregister_net(net, cn->cn_pipe);
808 rpc_destroy_pipe_data(cn->cn_pipe);
813 static struct cld_upcall *
814 alloc_cld_upcall(struct cld_net *cn)
816 struct cld_upcall *new, *tmp;
818 new = kzalloc(sizeof(*new), GFP_KERNEL);
822 /* FIXME: hard cap on number in flight? */
824 spin_lock(&cn->cn_lock);
825 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
826 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
828 spin_unlock(&cn->cn_lock);
832 new->cu_task = current;
833 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
834 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
836 list_add(&new->cu_list, &cn->cn_list);
837 spin_unlock(&cn->cn_lock);
839 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
845 free_cld_upcall(struct cld_upcall *victim)
847 struct cld_net *cn = victim->cu_net;
849 spin_lock(&cn->cn_lock);
850 list_del(&victim->cu_list);
851 spin_unlock(&cn->cn_lock);
855 /* Ask daemon to create a new record */
857 nfsd4_cld_create(struct nfs4_client *clp)
860 struct cld_upcall *cup;
861 /* FIXME: determine net from clp */
862 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
863 struct cld_net *cn = nn->cld_net;
865 /* Don't upcall if it's already stored */
866 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
869 cup = alloc_cld_upcall(cn);
875 cup->cu_msg.cm_cmd = Cld_Create;
876 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
877 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
880 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
882 ret = cup->cu_msg.cm_status;
883 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
886 free_cld_upcall(cup);
889 printk(KERN_ERR "NFSD: Unable to create client "
890 "record on stable storage: %d\n", ret);
893 /* Ask daemon to create a new record */
895 nfsd4_cld_remove(struct nfs4_client *clp)
898 struct cld_upcall *cup;
899 /* FIXME: determine net from clp */
900 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
901 struct cld_net *cn = nn->cld_net;
903 /* Don't upcall if it's already removed */
904 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
907 cup = alloc_cld_upcall(cn);
913 cup->cu_msg.cm_cmd = Cld_Remove;
914 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
915 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
918 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
920 ret = cup->cu_msg.cm_status;
921 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
924 free_cld_upcall(cup);
927 printk(KERN_ERR "NFSD: Unable to remove client "
928 "record from stable storage: %d\n", ret);
931 /* Check for presence of a record, and update its timestamp */
933 nfsd4_cld_check(struct nfs4_client *clp)
936 struct cld_upcall *cup;
937 /* FIXME: determine net from clp */
938 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
939 struct cld_net *cn = nn->cld_net;
941 /* Don't upcall if one was already stored during this grace pd */
942 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
945 cup = alloc_cld_upcall(cn);
947 printk(KERN_ERR "NFSD: Unable to check client record on "
948 "stable storage: %d\n", -ENOMEM);
952 cup->cu_msg.cm_cmd = Cld_Check;
953 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
954 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
957 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
959 ret = cup->cu_msg.cm_status;
960 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
963 free_cld_upcall(cup);
968 nfsd4_cld_grace_done(struct net *net, time_t boot_time)
971 struct cld_upcall *cup;
972 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
973 struct cld_net *cn = nn->cld_net;
975 cup = alloc_cld_upcall(cn);
981 cup->cu_msg.cm_cmd = Cld_GraceDone;
982 cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
983 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
985 ret = cup->cu_msg.cm_status;
987 free_cld_upcall(cup);
990 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
993 static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
994 .init = nfsd4_init_cld_pipe,
995 .exit = nfsd4_remove_cld_pipe,
996 .create = nfsd4_cld_create,
997 .remove = nfsd4_cld_remove,
998 .check = nfsd4_cld_check,
999 .grace_done = nfsd4_cld_grace_done,
1002 /* upcall via usermodehelper */
1003 static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1004 module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1006 MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1008 static bool cltrack_legacy_disable;
1009 module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1010 MODULE_PARM_DESC(cltrack_legacy_disable,
1011 "Disable legacy recoverydir conversion. Default: false");
1013 #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1014 #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1017 nfsd4_cltrack_legacy_topdir(void)
1023 if (cltrack_legacy_disable)
1026 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1027 strlen(nfs4_recoverydir()) + 1;
1029 result = kmalloc(len, GFP_KERNEL);
1033 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1034 nfs4_recoverydir());
1035 if (copied >= len) {
1036 /* just return nothing if output was truncated */
1045 nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1051 if (cltrack_legacy_disable)
1054 /* +1 is for '/' between "topdir" and "recdir" */
1055 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1056 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1058 result = kmalloc(len, GFP_KERNEL);
1062 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1063 nfs4_recoverydir());
1064 if (copied > (len - HEXDIR_LEN)) {
1065 /* just return nothing if output will be truncated */
1070 copied = nfs4_make_rec_clidname(result + copied, name);
1080 nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy)
1086 if (unlikely(!cltrack_prog[0])) {
1087 dprintk("%s: cltrack_prog is disabled\n", __func__);
1091 dprintk("%s: cmd: %s\n", __func__, cmd);
1092 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1093 dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)");
1098 argv[0] = (char *)cltrack_prog;
1103 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1105 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1106 * error. The admin can re-enable it on the fly by using sysfs
1107 * once the problem has been fixed.
1109 if (ret == -ENOENT || ret == -EACCES) {
1110 dprintk("NFSD: %s was not found or isn't executable (%d). "
1111 "Setting cltrack_prog to blank string!",
1113 cltrack_prog[0] = '\0';
1115 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1121 bin_to_hex_dup(const unsigned char *src, int srclen)
1126 /* +1 for terminating NULL */
1127 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1132 for (i = 0; i < srclen; i++) {
1133 sprintf(hex, "%2.2x", *src++);
1140 nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net)
1142 return nfsd4_umh_cltrack_upcall("init", NULL, NULL);
1146 nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1150 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1152 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1155 nfsd4_umh_cltrack_upcall("create", hexid, NULL);
1160 nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1164 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1166 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1169 nfsd4_umh_cltrack_upcall("remove", hexid, NULL);
1174 nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1177 char *hexid, *legacy;
1179 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1181 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1184 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1185 ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy);
1192 nfsd4_umh_cltrack_grace_done(struct net __attribute__((unused)) *net,
1196 char timestr[22]; /* FIXME: better way to determine max size? */
1198 sprintf(timestr, "%ld", boot_time);
1199 legacy = nfsd4_cltrack_legacy_topdir();
1200 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy);
1204 static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1205 .init = nfsd4_umh_cltrack_init,
1207 .create = nfsd4_umh_cltrack_create,
1208 .remove = nfsd4_umh_cltrack_remove,
1209 .check = nfsd4_umh_cltrack_check,
1210 .grace_done = nfsd4_umh_cltrack_grace_done,
1214 nfsd4_client_tracking_init(struct net *net)
1219 /* just run the init if it the method is already decided */
1220 if (client_tracking_ops)
1224 * First, try a UMH upcall. It should succeed or fail quickly, so
1225 * there's little harm in trying that first.
1227 client_tracking_ops = &nfsd4_umh_tracking_ops;
1228 status = client_tracking_ops->init(net);
1233 * See if the recoverydir exists and is a directory. If it is,
1234 * then use the legacy ops.
1236 client_tracking_ops = &nfsd4_legacy_tracking_ops;
1237 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1239 status = S_ISDIR(path.dentry->d_inode->i_mode);
1245 /* Finally, try to use nfsdcld */
1246 client_tracking_ops = &nfsd4_cld_tracking_ops;
1247 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1248 "removed in 3.10. Please transition to using "
1251 status = client_tracking_ops->init(net);
1253 printk(KERN_WARNING "NFSD: Unable to initialize client "
1254 "recovery tracking! (%d)\n", status);
1255 client_tracking_ops = NULL;
1261 nfsd4_client_tracking_exit(struct net *net)
1263 if (client_tracking_ops) {
1264 if (client_tracking_ops->exit)
1265 client_tracking_ops->exit(net);
1266 client_tracking_ops = NULL;
1271 nfsd4_client_record_create(struct nfs4_client *clp)
1273 if (client_tracking_ops)
1274 client_tracking_ops->create(clp);
1278 nfsd4_client_record_remove(struct nfs4_client *clp)
1280 if (client_tracking_ops)
1281 client_tracking_ops->remove(clp);
1285 nfsd4_client_record_check(struct nfs4_client *clp)
1287 if (client_tracking_ops)
1288 return client_tracking_ops->check(clp);
1294 nfsd4_record_grace_done(struct net *net, time_t boot_time)
1296 if (client_tracking_ops)
1297 client_tracking_ops->grace_done(net, boot_time);
1301 rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1303 struct super_block *sb = ptr;
1304 struct net *net = sb->s_fs_info;
1305 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1306 struct cld_net *cn = nn->cld_net;
1307 struct dentry *dentry;
1310 if (!try_module_get(THIS_MODULE))
1314 module_put(THIS_MODULE);
1319 case RPC_PIPEFS_MOUNT:
1320 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1321 if (IS_ERR(dentry)) {
1322 ret = PTR_ERR(dentry);
1325 cn->cn_pipe->dentry = dentry;
1327 case RPC_PIPEFS_UMOUNT:
1328 if (cn->cn_pipe->dentry)
1329 nfsd4_cld_unregister_sb(cn->cn_pipe);
1335 module_put(THIS_MODULE);
1339 static struct notifier_block nfsd4_cld_block = {
1340 .notifier_call = rpc_pipefs_event,
1344 register_cld_notifier(void)
1346 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1350 unregister_cld_notifier(void)
1352 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);