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 <crypto/hash.h>
36 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.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 *);
66 static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops;
67 static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2;
70 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
73 nfs4_save_creds(const struct cred **original_creds)
77 new = prepare_creds();
81 new->fsuid = GLOBAL_ROOT_UID;
82 new->fsgid = GLOBAL_ROOT_GID;
83 *original_creds = override_creds(new);
89 nfs4_reset_creds(const struct cred *original)
91 revert_creds(original);
95 md5_to_hex(char *out, char *md5)
99 for (i=0; i<16; i++) {
100 unsigned char c = md5[i];
102 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
103 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
109 nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
111 struct xdr_netobj cksum;
112 struct crypto_shash *tfm;
115 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
116 clname->len, clname->data);
117 tfm = crypto_alloc_shash("md5", 0, 0);
119 status = PTR_ERR(tfm);
123 cksum.len = crypto_shash_digestsize(tfm);
124 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
125 if (cksum.data == NULL) {
131 SHASH_DESC_ON_STACK(desc, tfm);
135 status = crypto_shash_digest(desc, clname->data, clname->len,
137 shash_desc_zero(desc);
143 md5_to_hex(dname, cksum.data);
148 crypto_free_shash(tfm);
154 * If we had an error generating the recdir name for the legacy tracker
155 * then warn the admin. If the error doesn't appear to be transient,
156 * then disable recovery tracking.
159 legacy_recdir_name_error(struct nfs4_client *clp, int error)
161 printk(KERN_ERR "NFSD: unable to generate recoverydir "
162 "name (%d).\n", error);
165 * if the algorithm just doesn't exist, then disable the recovery
166 * tracker altogether. The crypto libs will generally return this if
167 * FIPS is enabled as well.
169 if (error == -ENOENT) {
170 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
171 "Reboot recovery will not function correctly!\n");
172 nfsd4_client_tracking_exit(clp->net);
177 __nfsd4_create_reclaim_record_grace(struct nfs4_client *clp,
178 const char *dname, int len, struct nfsd_net *nn)
180 struct xdr_netobj name;
181 struct xdr_netobj princhash = { .len = 0, .data = NULL };
182 struct nfs4_client_reclaim *crp;
184 name.data = kmemdup(dname, len, GFP_KERNEL);
186 dprintk("%s: failed to allocate memory for name.data!\n",
191 crp = nfs4_client_to_reclaim(name, princhash, nn);
200 nfsd4_create_clid_dir(struct nfs4_client *clp)
202 const struct cred *original_cred;
203 char dname[HEXDIR_LEN];
204 struct dentry *dir, *dentry;
206 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
208 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
213 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
215 return legacy_recdir_name_error(clp, status);
217 status = nfs4_save_creds(&original_cred);
221 status = mnt_want_write_file(nn->rec_file);
225 dir = nn->rec_file->f_path.dentry;
226 /* lock the parent */
227 inode_lock(d_inode(dir));
229 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
230 if (IS_ERR(dentry)) {
231 status = PTR_ERR(dentry);
234 if (d_really_is_positive(dentry))
236 * In the 4.1 case, where we're called from
237 * reclaim_complete(), records from the previous reboot
238 * may still be left, so this is OK.
240 * In the 4.0 case, we should never get here; but we may
241 * as well be forgiving and just succeed silently.
244 status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU);
248 inode_unlock(d_inode(dir));
251 __nfsd4_create_reclaim_record_grace(clp, dname,
253 vfs_fsync(nn->rec_file, 0);
255 printk(KERN_ERR "NFSD: failed to write recovery record"
256 " (err %d); please check that %s exists"
257 " and is writeable", status,
258 user_recovery_dirname);
260 mnt_drop_write_file(nn->rec_file);
262 nfs4_reset_creds(original_cred);
265 typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
268 char name[HEXDIR_LEN];
269 struct list_head list;
272 struct nfs4_dir_ctx {
273 struct dir_context ctx;
274 struct list_head names;
278 nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
279 loff_t offset, u64 ino, unsigned int d_type)
281 struct nfs4_dir_ctx *ctx =
282 container_of(__ctx, struct nfs4_dir_ctx, ctx);
283 struct name_list *entry;
285 if (namlen != HEXDIR_LEN - 1)
287 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
290 memcpy(entry->name, name, HEXDIR_LEN - 1);
291 entry->name[HEXDIR_LEN - 1] = '\0';
292 list_add(&entry->list, &ctx->names);
297 nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
299 const struct cred *original_cred;
300 struct dentry *dir = nn->rec_file->f_path.dentry;
301 struct nfs4_dir_ctx ctx = {
302 .ctx.actor = nfsd4_build_namelist,
303 .names = LIST_HEAD_INIT(ctx.names)
305 struct name_list *entry, *tmp;
308 status = nfs4_save_creds(&original_cred);
312 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
314 nfs4_reset_creds(original_cred);
318 status = iterate_dir(nn->rec_file, &ctx.ctx);
319 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
321 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
323 struct dentry *dentry;
324 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
325 if (IS_ERR(dentry)) {
326 status = PTR_ERR(dentry);
329 status = f(dir, dentry, nn);
332 list_del(&entry->list);
335 inode_unlock(d_inode(dir));
336 nfs4_reset_creds(original_cred);
338 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
339 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name);
340 list_del(&entry->list);
347 nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
349 struct dentry *dir, *dentry;
352 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
354 dir = nn->rec_file->f_path.dentry;
355 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
356 dentry = lookup_one_len(name, dir, namlen);
357 if (IS_ERR(dentry)) {
358 status = PTR_ERR(dentry);
362 if (d_really_is_negative(dentry))
364 status = vfs_rmdir(d_inode(dir), dentry);
368 inode_unlock(d_inode(dir));
373 __nfsd4_remove_reclaim_record_grace(const char *dname, int len,
376 struct xdr_netobj name;
377 struct nfs4_client_reclaim *crp;
379 name.data = kmemdup(dname, len, GFP_KERNEL);
381 dprintk("%s: failed to allocate memory for name.data!\n",
386 crp = nfsd4_find_reclaim_client(name, nn);
389 nfs4_remove_reclaim_record(crp, nn);
393 nfsd4_remove_clid_dir(struct nfs4_client *clp)
395 const struct cred *original_cred;
396 char dname[HEXDIR_LEN];
398 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
400 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
403 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
405 return legacy_recdir_name_error(clp, status);
407 status = mnt_want_write_file(nn->rec_file);
410 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
412 status = nfs4_save_creds(&original_cred);
416 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
417 nfs4_reset_creds(original_cred);
419 vfs_fsync(nn->rec_file, 0);
421 __nfsd4_remove_reclaim_record_grace(dname,
425 mnt_drop_write_file(nn->rec_file);
428 printk("NFSD: Failed to remove expired client state directory"
429 " %.*s\n", HEXDIR_LEN, dname);
433 purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
436 struct xdr_netobj name;
438 if (child->d_name.len != HEXDIR_LEN - 1) {
439 printk("%s: illegal name %pd in recovery directory\n",
441 /* Keep trying; maybe the others are OK: */
444 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
446 dprintk("%s: failed to allocate memory for name.data!\n",
450 name.len = HEXDIR_LEN;
451 if (nfs4_has_reclaimed_state(name, nn))
454 status = vfs_rmdir(d_inode(parent), child);
456 printk("failed to remove client recovery directory %pd\n",
461 /* Keep trying, success or failure: */
466 nfsd4_recdir_purge_old(struct nfsd_net *nn)
470 nn->in_grace = false;
473 status = mnt_want_write_file(nn->rec_file);
476 status = nfsd4_list_rec_dir(purge_old, nn);
478 vfs_fsync(nn->rec_file, 0);
479 mnt_drop_write_file(nn->rec_file);
481 nfs4_release_reclaim(nn);
483 printk("nfsd4: failed to purge old clients from recovery"
484 " directory %pD\n", nn->rec_file);
488 load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
490 struct xdr_netobj name;
491 struct xdr_netobj princhash = { .len = 0, .data = NULL };
493 if (child->d_name.len != HEXDIR_LEN - 1) {
494 printk("%s: illegal name %pd in recovery directory\n",
496 /* Keep trying; maybe the others are OK: */
499 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
501 dprintk("%s: failed to allocate memory for name.data!\n",
505 name.len = HEXDIR_LEN;
506 if (!nfs4_client_to_reclaim(name, princhash, nn))
513 nfsd4_recdir_load(struct net *net) {
515 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
520 status = nfsd4_list_rec_dir(load_recdir, nn);
522 printk("nfsd4: failed loading clients from recovery"
523 " directory %pD\n", nn->rec_file);
528 * Hold reference to the recovery directory.
532 nfsd4_init_recdir(struct net *net)
534 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
535 const struct cred *original_cred;
538 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
539 user_recovery_dirname);
541 BUG_ON(nn->rec_file);
543 status = nfs4_save_creds(&original_cred);
545 printk("NFSD: Unable to change credentials to find recovery"
546 " directory: error %d\n",
551 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
552 if (IS_ERR(nn->rec_file)) {
553 printk("NFSD: unable to find recovery directory %s\n",
554 user_recovery_dirname);
555 status = PTR_ERR(nn->rec_file);
559 nfs4_reset_creds(original_cred);
566 nfsd4_shutdown_recdir(struct net *net)
568 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
577 nfs4_legacy_state_init(struct net *net)
579 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
582 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
583 sizeof(struct list_head),
585 if (!nn->reclaim_str_hashtbl)
588 for (i = 0; i < CLIENT_HASH_SIZE; i++)
589 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
590 nn->reclaim_str_hashtbl_size = 0;
596 nfs4_legacy_state_shutdown(struct net *net)
598 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
600 kfree(nn->reclaim_str_hashtbl);
604 nfsd4_load_reboot_recovery_data(struct net *net)
608 status = nfsd4_init_recdir(net);
612 status = nfsd4_recdir_load(net);
614 nfsd4_shutdown_recdir(net);
620 nfsd4_legacy_tracking_init(struct net *net)
624 /* XXX: The legacy code won't work in a container */
625 if (net != &init_net) {
626 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n");
630 status = nfs4_legacy_state_init(net);
634 status = nfsd4_load_reboot_recovery_data(net);
637 printk("NFSD: Using legacy client tracking operations.\n");
641 nfs4_legacy_state_shutdown(net);
646 nfsd4_legacy_tracking_exit(struct net *net)
648 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
650 nfs4_release_reclaim(nn);
651 nfsd4_shutdown_recdir(net);
652 nfs4_legacy_state_shutdown(net);
656 * Change the NFSv4 recovery directory to recdir.
659 nfs4_reset_recoverydir(char *recdir)
664 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
668 if (d_is_dir(path.dentry)) {
669 strcpy(user_recovery_dirname, recdir);
677 nfs4_recoverydir(void)
679 return user_recovery_dirname;
683 nfsd4_check_legacy_client(struct nfs4_client *clp)
686 char dname[HEXDIR_LEN];
687 struct nfs4_client_reclaim *crp;
688 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
689 struct xdr_netobj name;
691 /* did we already find that this client is stable? */
692 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
695 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
697 legacy_recdir_name_error(clp, status);
701 /* look for it in the reclaim hashtable otherwise */
702 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
704 dprintk("%s: failed to allocate memory for name.data!\n",
708 name.len = HEXDIR_LEN;
709 crp = nfsd4_find_reclaim_client(name, nn);
712 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
721 static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
722 .init = nfsd4_legacy_tracking_init,
723 .exit = nfsd4_legacy_tracking_exit,
724 .create = nfsd4_create_clid_dir,
725 .remove = nfsd4_remove_clid_dir,
726 .check = nfsd4_check_legacy_client,
727 .grace_done = nfsd4_recdir_purge_old,
733 #define NFSD_PIPE_DIR "nfsd"
734 #define NFSD_CLD_PIPE "cld"
736 /* per-net-ns structure for holding cld upcall info */
738 struct rpc_pipe *cn_pipe;
740 struct list_head cn_list;
743 struct crypto_shash *cn_tfm;
747 struct list_head cu_list;
748 struct cld_net *cu_net;
749 struct completion cu_done;
751 struct cld_msg_hdr cu_hdr;
752 struct cld_msg cu_msg;
753 struct cld_msg_v2 cu_msg_v2;
758 __cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
761 struct rpc_pipe_msg msg;
762 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u);
763 struct nfsd_net *nn = net_generic(pipe->dentry->d_sb->s_fs_info,
766 memset(&msg, 0, sizeof(msg));
768 msg.len = nn->client_tracking_ops->msglen;
770 ret = rpc_queue_upcall(pipe, &msg);
775 wait_for_completion(&cup->cu_done);
784 cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
789 * -EAGAIN occurs when pipe is closed and reopened while there are
793 ret = __cld_pipe_upcall(pipe, cmsg);
794 } while (ret == -EAGAIN);
800 __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
803 uint8_t cmd, princhashlen;
804 struct xdr_netobj name, princhash = { .len = 0, .data = NULL };
806 struct cld_net *cn = nn->cld_net;
808 if (get_user(cmd, &cmsg->cm_cmd)) {
809 dprintk("%s: error when copying cmd from userspace", __func__);
812 if (cmd == Cld_GraceStart) {
813 if (nn->client_tracking_ops->version >= 2) {
814 const struct cld_clntinfo __user *ci;
816 ci = &cmsg->cm_u.cm_clntinfo;
817 if (get_user(namelen, &ci->cc_name.cn_len))
819 name.data = memdup_user(&ci->cc_name.cn_id, namelen);
820 if (IS_ERR_OR_NULL(name.data))
823 get_user(princhashlen, &ci->cc_princhash.cp_len);
824 if (princhashlen > 0) {
825 princhash.data = memdup_user(
826 &ci->cc_princhash.cp_data,
828 if (IS_ERR_OR_NULL(princhash.data)) {
832 princhash.len = princhashlen;
836 const struct cld_name __user *cnm;
838 cnm = &cmsg->cm_u.cm_name;
839 if (get_user(namelen, &cnm->cn_len))
841 name.data = memdup_user(&cnm->cn_id, namelen);
842 if (IS_ERR_OR_NULL(name.data))
846 if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) {
847 name.len = name.len - 5;
848 memmove(name.data, name.data + 5, name.len);
849 cn->cn_has_legacy = true;
851 if (!nfs4_client_to_reclaim(name, princhash, nn)) {
853 kfree(princhash.data);
856 return nn->client_tracking_ops->msglen;
862 cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
864 struct cld_upcall *tmp, *cup;
865 struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src;
866 struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src;
868 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
870 struct cld_net *cn = nn->cld_net;
873 if (mlen != nn->client_tracking_ops->msglen) {
874 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
875 nn->client_tracking_ops->msglen);
879 /* copy just the xid so we can try to find that */
880 if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) {
881 dprintk("%s: error when copying xid from userspace", __func__);
886 * copy the status so we know whether to remove the upcall from the
887 * list (for -EINPROGRESS, we just want to make sure the xid is
888 * valid, not remove the upcall from the list)
890 if (get_user(status, &hdr->cm_status)) {
891 dprintk("%s: error when copying status from userspace", __func__);
895 /* walk the list and find corresponding xid */
897 spin_lock(&cn->cn_lock);
898 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
899 if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) {
901 if (status != -EINPROGRESS)
902 list_del_init(&cup->cu_list);
906 spin_unlock(&cn->cn_lock);
908 /* couldn't find upcall? */
910 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
914 if (status == -EINPROGRESS)
915 return __cld_pipe_inprogress_downcall(cmsg, nn);
917 if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0)
920 complete(&cup->cu_done);
925 cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
927 struct cld_msg *cmsg = msg->data;
928 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
931 /* errno >= 0 means we got a downcall */
935 complete(&cup->cu_done);
938 static const struct rpc_pipe_ops cld_upcall_ops = {
939 .upcall = rpc_pipe_generic_upcall,
940 .downcall = cld_pipe_downcall,
941 .destroy_msg = cld_pipe_destroy_msg,
944 static struct dentry *
945 nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
947 struct dentry *dir, *dentry;
949 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
951 return ERR_PTR(-ENOENT);
952 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
958 nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
961 rpc_unlink(pipe->dentry);
964 static struct dentry *
965 nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
967 struct super_block *sb;
968 struct dentry *dentry;
970 sb = rpc_get_sb_net(net);
973 dentry = nfsd4_cld_register_sb(sb, pipe);
979 nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
981 struct super_block *sb;
983 sb = rpc_get_sb_net(net);
985 nfsd4_cld_unregister_sb(pipe);
990 /* Initialize rpc_pipefs pipe for communication with client tracking daemon */
992 __nfsd4_init_cld_pipe(struct net *net)
995 struct dentry *dentry;
996 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1002 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
1008 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
1009 if (IS_ERR(cn->cn_pipe)) {
1010 ret = PTR_ERR(cn->cn_pipe);
1013 spin_lock_init(&cn->cn_lock);
1014 INIT_LIST_HEAD(&cn->cn_list);
1016 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
1017 if (IS_ERR(dentry)) {
1018 ret = PTR_ERR(dentry);
1019 goto err_destroy_data;
1022 cn->cn_pipe->dentry = dentry;
1023 cn->cn_has_legacy = false;
1028 rpc_destroy_pipe_data(cn->cn_pipe);
1031 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
1037 nfsd4_init_cld_pipe(struct net *net)
1041 status = __nfsd4_init_cld_pipe(net);
1043 printk("NFSD: Using old nfsdcld client tracking operations.\n");
1048 nfsd4_remove_cld_pipe(struct net *net)
1050 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1051 struct cld_net *cn = nn->cld_net;
1053 nfsd4_cld_unregister_net(net, cn->cn_pipe);
1054 rpc_destroy_pipe_data(cn->cn_pipe);
1056 crypto_free_shash(cn->cn_tfm);
1061 static struct cld_upcall *
1062 alloc_cld_upcall(struct nfsd_net *nn)
1064 struct cld_upcall *new, *tmp;
1065 struct cld_net *cn = nn->cld_net;
1067 new = kzalloc(sizeof(*new), GFP_KERNEL);
1071 /* FIXME: hard cap on number in flight? */
1073 spin_lock(&cn->cn_lock);
1074 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
1075 if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) {
1077 spin_unlock(&cn->cn_lock);
1078 goto restart_search;
1081 init_completion(&new->cu_done);
1082 new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version;
1083 put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid);
1085 list_add(&new->cu_list, &cn->cn_list);
1086 spin_unlock(&cn->cn_lock);
1088 dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid);
1094 free_cld_upcall(struct cld_upcall *victim)
1096 struct cld_net *cn = victim->cu_net;
1098 spin_lock(&cn->cn_lock);
1099 list_del(&victim->cu_list);
1100 spin_unlock(&cn->cn_lock);
1104 /* Ask daemon to create a new record */
1106 nfsd4_cld_create(struct nfs4_client *clp)
1109 struct cld_upcall *cup;
1110 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1111 struct cld_net *cn = nn->cld_net;
1113 /* Don't upcall if it's already stored */
1114 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1117 cup = alloc_cld_upcall(nn);
1123 cup->cu_u.cu_msg.cm_cmd = Cld_Create;
1124 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1125 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1128 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1130 ret = cup->cu_u.cu_msg.cm_status;
1131 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1134 free_cld_upcall(cup);
1137 printk(KERN_ERR "NFSD: Unable to create client "
1138 "record on stable storage: %d\n", ret);
1141 /* Ask daemon to create a new record */
1143 nfsd4_cld_create_v2(struct nfs4_client *clp)
1146 struct cld_upcall *cup;
1147 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1148 struct cld_net *cn = nn->cld_net;
1149 struct cld_msg_v2 *cmsg;
1150 struct crypto_shash *tfm = cn->cn_tfm;
1151 struct xdr_netobj cksum;
1152 char *principal = NULL;
1153 SHASH_DESC_ON_STACK(desc, tfm);
1155 /* Don't upcall if it's already stored */
1156 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1159 cup = alloc_cld_upcall(nn);
1165 cmsg = &cup->cu_u.cu_msg_v2;
1166 cmsg->cm_cmd = Cld_Create;
1167 cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len;
1168 memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data,
1170 if (clp->cl_cred.cr_raw_principal)
1171 principal = clp->cl_cred.cr_raw_principal;
1172 else if (clp->cl_cred.cr_principal)
1173 principal = clp->cl_cred.cr_principal;
1176 cksum.len = crypto_shash_digestsize(tfm);
1177 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1178 if (cksum.data == NULL) {
1182 ret = crypto_shash_digest(desc, principal, strlen(principal),
1184 shash_desc_zero(desc);
1189 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len;
1190 memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
1191 cksum.data, cksum.len);
1194 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0;
1196 ret = cld_pipe_upcall(cn->cn_pipe, cmsg);
1198 ret = cmsg->cm_status;
1199 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1203 free_cld_upcall(cup);
1206 pr_err("NFSD: Unable to create client record on stable storage: %d\n",
1210 /* Ask daemon to create a new record */
1212 nfsd4_cld_remove(struct nfs4_client *clp)
1215 struct cld_upcall *cup;
1216 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1217 struct cld_net *cn = nn->cld_net;
1219 /* Don't upcall if it's already removed */
1220 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1223 cup = alloc_cld_upcall(nn);
1229 cup->cu_u.cu_msg.cm_cmd = Cld_Remove;
1230 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1231 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1234 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1236 ret = cup->cu_u.cu_msg.cm_status;
1237 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1240 free_cld_upcall(cup);
1243 printk(KERN_ERR "NFSD: Unable to remove client "
1244 "record from stable storage: %d\n", ret);
1248 * For older nfsdcld's that do not allow us to "slurp" the clients
1249 * from the tracking database during startup.
1251 * Check for presence of a record, and update its timestamp
1254 nfsd4_cld_check_v0(struct nfs4_client *clp)
1257 struct cld_upcall *cup;
1258 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1259 struct cld_net *cn = nn->cld_net;
1261 /* Don't upcall if one was already stored during this grace pd */
1262 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1265 cup = alloc_cld_upcall(nn);
1267 printk(KERN_ERR "NFSD: Unable to check client record on "
1268 "stable storage: %d\n", -ENOMEM);
1272 cup->cu_u.cu_msg.cm_cmd = Cld_Check;
1273 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1274 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1277 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1279 ret = cup->cu_u.cu_msg.cm_status;
1280 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1283 free_cld_upcall(cup);
1288 * For newer nfsdcld's that allow us to "slurp" the clients
1289 * from the tracking database during startup.
1291 * Check for presence of a record in the reclaim_str_hashtbl
1294 nfsd4_cld_check(struct nfs4_client *clp)
1296 struct nfs4_client_reclaim *crp;
1297 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1298 struct cld_net *cn = nn->cld_net;
1300 char dname[HEXDIR_LEN];
1301 struct xdr_netobj name;
1303 /* did we already find that this client is stable? */
1304 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1307 /* look for it in the reclaim hashtable otherwise */
1308 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1312 if (cn->cn_has_legacy) {
1313 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1317 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1319 dprintk("%s: failed to allocate memory for name.data!\n",
1323 name.len = HEXDIR_LEN;
1324 crp = nfsd4_find_reclaim_client(name, nn);
1337 nfsd4_cld_check_v2(struct nfs4_client *clp)
1339 struct nfs4_client_reclaim *crp;
1340 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1341 struct cld_net *cn = nn->cld_net;
1343 char dname[HEXDIR_LEN];
1344 struct xdr_netobj name;
1345 struct crypto_shash *tfm = cn->cn_tfm;
1346 struct xdr_netobj cksum;
1347 char *principal = NULL;
1348 SHASH_DESC_ON_STACK(desc, tfm);
1350 /* did we already find that this client is stable? */
1351 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1354 /* look for it in the reclaim hashtable otherwise */
1355 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1359 if (cn->cn_has_legacy) {
1360 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1364 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1366 dprintk("%s: failed to allocate memory for name.data\n",
1370 name.len = HEXDIR_LEN;
1371 crp = nfsd4_find_reclaim_client(name, nn);
1379 if (crp->cr_princhash.len) {
1380 if (clp->cl_cred.cr_raw_principal)
1381 principal = clp->cl_cred.cr_raw_principal;
1382 else if (clp->cl_cred.cr_principal)
1383 principal = clp->cl_cred.cr_principal;
1384 if (principal == NULL)
1387 cksum.len = crypto_shash_digestsize(tfm);
1388 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1389 if (cksum.data == NULL)
1391 status = crypto_shash_digest(desc, principal, strlen(principal),
1393 shash_desc_zero(desc);
1398 if (memcmp(crp->cr_princhash.data, cksum.data,
1399 crp->cr_princhash.len)) {
1410 nfsd4_cld_grace_start(struct nfsd_net *nn)
1413 struct cld_upcall *cup;
1414 struct cld_net *cn = nn->cld_net;
1416 cup = alloc_cld_upcall(nn);
1422 cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart;
1423 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1425 ret = cup->cu_u.cu_msg.cm_status;
1427 free_cld_upcall(cup);
1430 dprintk("%s: Unable to get clients from userspace: %d\n",
1435 /* For older nfsdcld's that need cm_gracetime */
1437 nfsd4_cld_grace_done_v0(struct nfsd_net *nn)
1440 struct cld_upcall *cup;
1441 struct cld_net *cn = nn->cld_net;
1443 cup = alloc_cld_upcall(nn);
1449 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1450 cup->cu_u.cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time;
1451 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1453 ret = cup->cu_u.cu_msg.cm_status;
1455 free_cld_upcall(cup);
1458 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1462 * For newer nfsdcld's that do not need cm_gracetime. We also need to call
1463 * nfs4_release_reclaim() to clear out the reclaim_str_hashtbl.
1466 nfsd4_cld_grace_done(struct nfsd_net *nn)
1469 struct cld_upcall *cup;
1470 struct cld_net *cn = nn->cld_net;
1472 cup = alloc_cld_upcall(nn);
1478 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1479 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1481 ret = cup->cu_u.cu_msg.cm_status;
1483 free_cld_upcall(cup);
1485 nfs4_release_reclaim(nn);
1487 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1491 nfs4_cld_state_init(struct net *net)
1493 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1496 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
1497 sizeof(struct list_head),
1499 if (!nn->reclaim_str_hashtbl)
1502 for (i = 0; i < CLIENT_HASH_SIZE; i++)
1503 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
1504 nn->reclaim_str_hashtbl_size = 0;
1505 nn->track_reclaim_completes = true;
1506 atomic_set(&nn->nr_reclaim_complete, 0);
1512 nfs4_cld_state_shutdown(struct net *net)
1514 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1516 nn->track_reclaim_completes = false;
1517 kfree(nn->reclaim_str_hashtbl);
1521 cld_running(struct nfsd_net *nn)
1523 struct cld_net *cn = nn->cld_net;
1524 struct rpc_pipe *pipe = cn->cn_pipe;
1526 return pipe->nreaders || pipe->nwriters;
1530 nfsd4_cld_get_version(struct nfsd_net *nn)
1533 struct cld_upcall *cup;
1534 struct cld_net *cn = nn->cld_net;
1537 cup = alloc_cld_upcall(nn);
1542 cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion;
1543 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1545 ret = cup->cu_u.cu_msg.cm_status;
1548 version = cup->cu_u.cu_msg.cm_u.cm_version;
1549 dprintk("%s: userspace returned version %u\n",
1553 else if (version > CLD_UPCALL_VERSION)
1554 version = CLD_UPCALL_VERSION;
1558 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1561 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2;
1568 free_cld_upcall(cup);
1571 dprintk("%s: Unable to get version from userspace: %d\n",
1577 nfsd4_cld_tracking_init(struct net *net)
1580 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1583 struct crypto_shash *tfm;
1585 status = nfs4_cld_state_init(net);
1589 status = __nfsd4_init_cld_pipe(net);
1594 * rpc pipe upcalls take 30 seconds to time out, so we don't want to
1595 * queue an upcall unless we know that nfsdcld is running (because we
1596 * want this to fail fast so that nfsd4_client_tracking_init() can try
1597 * the next client tracking method). nfsdcld should already be running
1598 * before nfsd is started, so the wait here is for nfsdcld to open the
1599 * pipefs file we just created.
1601 while (!(running = cld_running(nn)) && retries--)
1605 status = -ETIMEDOUT;
1608 tfm = crypto_alloc_shash("sha256", 0, 0);
1610 status = PTR_ERR(tfm);
1613 nn->cld_net->cn_tfm = tfm;
1615 status = nfsd4_cld_get_version(nn);
1616 if (status == -EOPNOTSUPP)
1617 pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n");
1619 status = nfsd4_cld_grace_start(nn);
1621 if (status == -EOPNOTSUPP)
1622 pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n");
1623 nfs4_release_reclaim(nn);
1626 printk("NFSD: Using nfsdcld client tracking operations.\n");
1630 nfsd4_remove_cld_pipe(net);
1632 nfs4_cld_state_shutdown(net);
1637 nfsd4_cld_tracking_exit(struct net *net)
1639 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1641 nfs4_release_reclaim(nn);
1642 nfsd4_remove_cld_pipe(net);
1643 nfs4_cld_state_shutdown(net);
1646 /* For older nfsdcld's */
1647 static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = {
1648 .init = nfsd4_init_cld_pipe,
1649 .exit = nfsd4_remove_cld_pipe,
1650 .create = nfsd4_cld_create,
1651 .remove = nfsd4_cld_remove,
1652 .check = nfsd4_cld_check_v0,
1653 .grace_done = nfsd4_cld_grace_done_v0,
1655 .msglen = sizeof(struct cld_msg),
1658 /* For newer nfsdcld's */
1659 static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1660 .init = nfsd4_cld_tracking_init,
1661 .exit = nfsd4_cld_tracking_exit,
1662 .create = nfsd4_cld_create,
1663 .remove = nfsd4_cld_remove,
1664 .check = nfsd4_cld_check,
1665 .grace_done = nfsd4_cld_grace_done,
1667 .msglen = sizeof(struct cld_msg),
1670 /* v2 create/check ops include the principal, if available */
1671 static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = {
1672 .init = nfsd4_cld_tracking_init,
1673 .exit = nfsd4_cld_tracking_exit,
1674 .create = nfsd4_cld_create_v2,
1675 .remove = nfsd4_cld_remove,
1676 .check = nfsd4_cld_check_v2,
1677 .grace_done = nfsd4_cld_grace_done,
1679 .msglen = sizeof(struct cld_msg_v2),
1682 /* upcall via usermodehelper */
1683 static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1684 module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1686 MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1688 static bool cltrack_legacy_disable;
1689 module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1690 MODULE_PARM_DESC(cltrack_legacy_disable,
1691 "Disable legacy recoverydir conversion. Default: false");
1693 #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1694 #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1695 #define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1696 #define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
1699 nfsd4_cltrack_legacy_topdir(void)
1705 if (cltrack_legacy_disable)
1708 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1709 strlen(nfs4_recoverydir()) + 1;
1711 result = kmalloc(len, GFP_KERNEL);
1715 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1716 nfs4_recoverydir());
1717 if (copied >= len) {
1718 /* just return nothing if output was truncated */
1727 nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1733 if (cltrack_legacy_disable)
1736 /* +1 is for '/' between "topdir" and "recdir" */
1737 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1738 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1740 result = kmalloc(len, GFP_KERNEL);
1744 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1745 nfs4_recoverydir());
1746 if (copied > (len - HEXDIR_LEN)) {
1747 /* just return nothing if output will be truncated */
1752 copied = nfs4_make_rec_clidname(result + copied, name);
1762 nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
1768 /* prefix + Y/N character + terminating NULL */
1769 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1771 result = kmalloc(len, GFP_KERNEL);
1775 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1776 clp->cl_minorversion ? 'Y' : 'N');
1777 if (copied >= len) {
1778 /* just return nothing if output was truncated */
1787 nfsd4_cltrack_grace_start(time_t grace_start)
1793 /* prefix + max width of int64_t string + terminating NULL */
1794 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1796 result = kmalloc(len, GFP_KERNEL);
1800 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld",
1802 if (copied >= len) {
1803 /* just return nothing if output was truncated */
1812 nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1818 if (unlikely(!cltrack_prog[0])) {
1819 dprintk("%s: cltrack_prog is disabled\n", __func__);
1823 dprintk("%s: cmd: %s\n", __func__, cmd);
1824 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1825 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1826 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
1832 argv[0] = (char *)cltrack_prog;
1837 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1839 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1840 * error. The admin can re-enable it on the fly by using sysfs
1841 * once the problem has been fixed.
1843 if (ret == -ENOENT || ret == -EACCES) {
1844 dprintk("NFSD: %s was not found or isn't executable (%d). "
1845 "Setting cltrack_prog to blank string!",
1847 cltrack_prog[0] = '\0';
1849 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1855 bin_to_hex_dup(const unsigned char *src, int srclen)
1860 /* +1 for terminating NULL */
1861 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1866 for (i = 0; i < srclen; i++) {
1867 sprintf(hex, "%2.2x", *src++);
1874 nfsd4_umh_cltrack_init(struct net *net)
1877 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1878 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1880 /* XXX: The usermode helper s not working in container yet. */
1881 if (net != &init_net) {
1882 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n");
1887 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1890 printk("NFSD: Using UMH upcall client tracking operations.\n");
1895 nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1897 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1898 TASK_UNINTERRUPTIBLE);
1902 nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1904 smp_mb__before_atomic();
1905 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1906 smp_mb__after_atomic();
1907 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
1911 nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1913 char *hexid, *has_session, *grace_start;
1914 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1917 * With v4.0 clients, there's little difference in outcome between a
1918 * create and check operation, and we can end up calling into this
1919 * function multiple times per client (once for each openowner). So,
1920 * for v4.0 clients skip upcalling once the client has been recorded
1921 * on stable storage.
1923 * For v4.1+ clients, the outcome of the two operations is different,
1924 * so we must ensure that we upcall for the create operation. v4.1+
1925 * clients call this on RECLAIM_COMPLETE though, so we should only end
1926 * up doing a single create upcall per client.
1928 if (clp->cl_minorversion == 0 &&
1929 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1932 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1934 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1938 has_session = nfsd4_cltrack_client_has_session(clp);
1939 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1941 nfsd4_cltrack_upcall_lock(clp);
1942 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1943 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1944 nfsd4_cltrack_upcall_unlock(clp);
1952 nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1956 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1959 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1961 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1965 nfsd4_cltrack_upcall_lock(clp);
1966 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1967 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1968 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1969 nfsd4_cltrack_upcall_unlock(clp);
1975 nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1978 char *hexid, *has_session, *legacy;
1980 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1983 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1985 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1989 has_session = nfsd4_cltrack_client_has_session(clp);
1990 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1992 nfsd4_cltrack_upcall_lock(clp);
1993 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1996 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1998 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
2000 nfsd4_cltrack_upcall_unlock(clp);
2009 nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
2012 char timestr[22]; /* FIXME: better way to determine max size? */
2014 sprintf(timestr, "%ld", nn->boot_time);
2015 legacy = nfsd4_cltrack_legacy_topdir();
2016 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
2020 static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
2021 .init = nfsd4_umh_cltrack_init,
2023 .create = nfsd4_umh_cltrack_create,
2024 .remove = nfsd4_umh_cltrack_remove,
2025 .check = nfsd4_umh_cltrack_check,
2026 .grace_done = nfsd4_umh_cltrack_grace_done,
2032 nfsd4_client_tracking_init(struct net *net)
2036 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2038 /* just run the init if it the method is already decided */
2039 if (nn->client_tracking_ops)
2042 /* First, try to use nfsdcld */
2043 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
2044 status = nn->client_tracking_ops->init(net);
2047 if (status != -ETIMEDOUT) {
2048 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0;
2049 status = nn->client_tracking_ops->init(net);
2055 * Next, try the UMH upcall.
2057 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
2058 status = nn->client_tracking_ops->init(net);
2063 * Finally, See if the recoverydir exists and is a directory.
2064 * If it is, then use the legacy ops.
2066 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
2067 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
2069 status = d_is_dir(path.dentry);
2078 status = nn->client_tracking_ops->init(net);
2081 printk(KERN_WARNING "NFSD: Unable to initialize client "
2082 "recovery tracking! (%d)\n", status);
2083 nn->client_tracking_ops = NULL;
2089 nfsd4_client_tracking_exit(struct net *net)
2091 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2093 if (nn->client_tracking_ops) {
2094 if (nn->client_tracking_ops->exit)
2095 nn->client_tracking_ops->exit(net);
2096 nn->client_tracking_ops = NULL;
2101 nfsd4_client_record_create(struct nfs4_client *clp)
2103 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2105 if (nn->client_tracking_ops)
2106 nn->client_tracking_ops->create(clp);
2110 nfsd4_client_record_remove(struct nfs4_client *clp)
2112 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2114 if (nn->client_tracking_ops)
2115 nn->client_tracking_ops->remove(clp);
2119 nfsd4_client_record_check(struct nfs4_client *clp)
2121 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2123 if (nn->client_tracking_ops)
2124 return nn->client_tracking_ops->check(clp);
2130 nfsd4_record_grace_done(struct nfsd_net *nn)
2132 if (nn->client_tracking_ops)
2133 nn->client_tracking_ops->grace_done(nn);
2137 rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
2139 struct super_block *sb = ptr;
2140 struct net *net = sb->s_fs_info;
2141 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2142 struct cld_net *cn = nn->cld_net;
2143 struct dentry *dentry;
2146 if (!try_module_get(THIS_MODULE))
2150 module_put(THIS_MODULE);
2155 case RPC_PIPEFS_MOUNT:
2156 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
2157 if (IS_ERR(dentry)) {
2158 ret = PTR_ERR(dentry);
2161 cn->cn_pipe->dentry = dentry;
2163 case RPC_PIPEFS_UMOUNT:
2164 if (cn->cn_pipe->dentry)
2165 nfsd4_cld_unregister_sb(cn->cn_pipe);
2171 module_put(THIS_MODULE);
2175 static struct notifier_block nfsd4_cld_block = {
2176 .notifier_call = rpc_pipefs_event,
2180 register_cld_notifier(void)
2182 WARN_ON(!nfsd_net_id);
2183 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
2187 unregister_cld_notifier(void)
2189 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);