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1/*
2* Copyright (c) 2004 The Regents of the University of Michigan.
3* Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
4* All rights reserved.
5*
6* Andy Adamson <andros@citi.umich.edu>
7*
8* Redistribution and use in source and binary forms, with or without
9* modification, are permitted provided that the following conditions
10* are met:
11*
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.
20*
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.
32*
33*/
34
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>
40#include <linux/fs.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>
46
47#include "nfsd.h"
48#include "state.h"
49#include "vfs.h"
50#include "netns.h"
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Declarations */
55struct 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);
62};
63
64/* Globals */
65static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
66
67static int
68nfs4_save_creds(const struct cred **original_creds)
69{
70 struct cred *new;
71
72 new = prepare_creds();
73 if (!new)
74 return -ENOMEM;
75
76 new->fsuid = GLOBAL_ROOT_UID;
77 new->fsgid = GLOBAL_ROOT_GID;
78 *original_creds = override_creds(new);
79 put_cred(new);
80 return 0;
81}
82
83static void
84nfs4_reset_creds(const struct cred *original)
85{
86 revert_creds(original);
87}
88
89static void
90md5_to_hex(char *out, char *md5)
91{
92 int i;
93
94 for (i=0; i<16; i++) {
95 unsigned char c = md5[i];
96
97 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
98 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
99 }
100 *out = '\0';
101}
102
103static int
104nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
105{
106 struct xdr_netobj cksum;
107 struct hash_desc desc;
108 struct scatterlist sg;
109 int status;
110
111 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
112 clname->len, clname->data);
113 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
114 desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
115 if (IS_ERR(desc.tfm)) {
116 status = PTR_ERR(desc.tfm);
117 goto out_no_tfm;
118 }
119
120 cksum.len = crypto_hash_digestsize(desc.tfm);
121 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
122 if (cksum.data == NULL) {
123 status = -ENOMEM;
124 goto out;
125 }
126
127 sg_init_one(&sg, clname->data, clname->len);
128
129 status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data);
130 if (status)
131 goto out;
132
133 md5_to_hex(dname, cksum.data);
134
135 status = 0;
136out:
137 kfree(cksum.data);
138 crypto_free_hash(desc.tfm);
139out_no_tfm:
140 return status;
141}
142
143/*
144 * If we had an error generating the recdir name for the legacy tracker
145 * then warn the admin. If the error doesn't appear to be transient,
146 * then disable recovery tracking.
147 */
148static void
149legacy_recdir_name_error(struct nfs4_client *clp, int error)
150{
151 printk(KERN_ERR "NFSD: unable to generate recoverydir "
152 "name (%d).\n", error);
153
154 /*
155 * if the algorithm just doesn't exist, then disable the recovery
156 * tracker altogether. The crypto libs will generally return this if
157 * FIPS is enabled as well.
158 */
159 if (error == -ENOENT) {
160 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
161 "Reboot recovery will not function correctly!\n");
162 nfsd4_client_tracking_exit(clp->net);
163 }
164}
165
166static void
167nfsd4_create_clid_dir(struct nfs4_client *clp)
168{
169 const struct cred *original_cred;
170 char dname[HEXDIR_LEN];
171 struct dentry *dir, *dentry;
172 struct nfs4_client_reclaim *crp;
173 int status;
174 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
175
176 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
177 return;
178 if (!nn->rec_file)
179 return;
180
181 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
182 if (status)
183 return legacy_recdir_name_error(clp, status);
184
185 status = nfs4_save_creds(&original_cred);
186 if (status < 0)
187 return;
188
189 status = mnt_want_write_file(nn->rec_file);
190 if (status)
191 return;
192
193 dir = nn->rec_file->f_path.dentry;
194 /* lock the parent */
195 mutex_lock(&dir->d_inode->i_mutex);
196
197 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
198 if (IS_ERR(dentry)) {
199 status = PTR_ERR(dentry);
200 goto out_unlock;
201 }
202 if (dentry->d_inode)
203 /*
204 * In the 4.1 case, where we're called from
205 * reclaim_complete(), records from the previous reboot
206 * may still be left, so this is OK.
207 *
208 * In the 4.0 case, we should never get here; but we may
209 * as well be forgiving and just succeed silently.
210 */
211 goto out_put;
212 status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
213out_put:
214 dput(dentry);
215out_unlock:
216 mutex_unlock(&dir->d_inode->i_mutex);
217 if (status == 0) {
218 if (nn->in_grace) {
219 crp = nfs4_client_to_reclaim(dname, nn);
220 if (crp)
221 crp->cr_clp = clp;
222 }
223 vfs_fsync(nn->rec_file, 0);
224 } else {
225 printk(KERN_ERR "NFSD: failed to write recovery record"
226 " (err %d); please check that %s exists"
227 " and is writeable", status,
228 user_recovery_dirname);
229 }
230 mnt_drop_write_file(nn->rec_file);
231 nfs4_reset_creds(original_cred);
232}
233
234typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
235
236struct name_list {
237 char name[HEXDIR_LEN];
238 struct list_head list;
239};
240
241struct nfs4_dir_ctx {
242 struct dir_context ctx;
243 struct list_head names;
244};
245
246static int
247nfsd4_build_namelist(void *arg, const char *name, int namlen,
248 loff_t offset, u64 ino, unsigned int d_type)
249{
250 struct nfs4_dir_ctx *ctx = arg;
251 struct name_list *entry;
252
253 if (namlen != HEXDIR_LEN - 1)
254 return 0;
255 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
256 if (entry == NULL)
257 return -ENOMEM;
258 memcpy(entry->name, name, HEXDIR_LEN - 1);
259 entry->name[HEXDIR_LEN - 1] = '\0';
260 list_add(&entry->list, &ctx->names);
261 return 0;
262}
263
264static int
265nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
266{
267 const struct cred *original_cred;
268 struct dentry *dir = nn->rec_file->f_path.dentry;
269 struct nfs4_dir_ctx ctx = {
270 .ctx.actor = nfsd4_build_namelist,
271 .names = LIST_HEAD_INIT(ctx.names)
272 };
273 int status;
274
275 status = nfs4_save_creds(&original_cred);
276 if (status < 0)
277 return status;
278
279 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
280 if (status < 0) {
281 nfs4_reset_creds(original_cred);
282 return status;
283 }
284
285 status = iterate_dir(nn->rec_file, &ctx.ctx);
286 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
287 while (!list_empty(&ctx.names)) {
288 struct name_list *entry;
289 entry = list_entry(ctx.names.next, struct name_list, list);
290 if (!status) {
291 struct dentry *dentry;
292 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
293 if (IS_ERR(dentry)) {
294 status = PTR_ERR(dentry);
295 break;
296 }
297 status = f(dir, dentry, nn);
298 dput(dentry);
299 }
300 list_del(&entry->list);
301 kfree(entry);
302 }
303 mutex_unlock(&dir->d_inode->i_mutex);
304 nfs4_reset_creds(original_cred);
305 return status;
306}
307
308static int
309nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
310{
311 struct dentry *dir, *dentry;
312 int status;
313
314 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
315
316 dir = nn->rec_file->f_path.dentry;
317 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
318 dentry = lookup_one_len(name, dir, namlen);
319 if (IS_ERR(dentry)) {
320 status = PTR_ERR(dentry);
321 goto out_unlock;
322 }
323 status = -ENOENT;
324 if (!dentry->d_inode)
325 goto out;
326 status = vfs_rmdir(dir->d_inode, dentry);
327out:
328 dput(dentry);
329out_unlock:
330 mutex_unlock(&dir->d_inode->i_mutex);
331 return status;
332}
333
334static void
335nfsd4_remove_clid_dir(struct nfs4_client *clp)
336{
337 const struct cred *original_cred;
338 struct nfs4_client_reclaim *crp;
339 char dname[HEXDIR_LEN];
340 int status;
341 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
342
343 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
344 return;
345
346 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
347 if (status)
348 return legacy_recdir_name_error(clp, status);
349
350 status = mnt_want_write_file(nn->rec_file);
351 if (status)
352 goto out;
353 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
354
355 status = nfs4_save_creds(&original_cred);
356 if (status < 0)
357 goto out_drop_write;
358
359 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
360 nfs4_reset_creds(original_cred);
361 if (status == 0) {
362 vfs_fsync(nn->rec_file, 0);
363 if (nn->in_grace) {
364 /* remove reclaim record */
365 crp = nfsd4_find_reclaim_client(dname, nn);
366 if (crp)
367 nfs4_remove_reclaim_record(crp, nn);
368 }
369 }
370out_drop_write:
371 mnt_drop_write_file(nn->rec_file);
372out:
373 if (status)
374 printk("NFSD: Failed to remove expired client state directory"
375 " %.*s\n", HEXDIR_LEN, dname);
376}
377
378static int
379purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
380{
381 int status;
382
383 if (nfs4_has_reclaimed_state(child->d_name.name, nn))
384 return 0;
385
386 status = vfs_rmdir(parent->d_inode, child);
387 if (status)
388 printk("failed to remove client recovery directory %pd\n",
389 child);
390 /* Keep trying, success or failure: */
391 return 0;
392}
393
394static void
395nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time)
396{
397 int status;
398
399 nn->in_grace = false;
400 if (!nn->rec_file)
401 return;
402 status = mnt_want_write_file(nn->rec_file);
403 if (status)
404 goto out;
405 status = nfsd4_list_rec_dir(purge_old, nn);
406 if (status == 0)
407 vfs_fsync(nn->rec_file, 0);
408 mnt_drop_write_file(nn->rec_file);
409out:
410 nfs4_release_reclaim(nn);
411 if (status)
412 printk("nfsd4: failed to purge old clients from recovery"
413 " directory %pD\n", nn->rec_file);
414}
415
416static int
417load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
418{
419 if (child->d_name.len != HEXDIR_LEN - 1) {
420 printk("nfsd4: illegal name %pd in recovery directory\n",
421 child);
422 /* Keep trying; maybe the others are OK: */
423 return 0;
424 }
425 nfs4_client_to_reclaim(child->d_name.name, nn);
426 return 0;
427}
428
429static int
430nfsd4_recdir_load(struct net *net) {
431 int status;
432 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
433
434 if (!nn->rec_file)
435 return 0;
436
437 status = nfsd4_list_rec_dir(load_recdir, nn);
438 if (status)
439 printk("nfsd4: failed loading clients from recovery"
440 " directory %pD\n", nn->rec_file);
441 return status;
442}
443
444/*
445 * Hold reference to the recovery directory.
446 */
447
448static int
449nfsd4_init_recdir(struct net *net)
450{
451 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
452 const struct cred *original_cred;
453 int status;
454
455 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
456 user_recovery_dirname);
457
458 BUG_ON(nn->rec_file);
459
460 status = nfs4_save_creds(&original_cred);
461 if (status < 0) {
462 printk("NFSD: Unable to change credentials to find recovery"
463 " directory: error %d\n",
464 status);
465 return status;
466 }
467
468 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
469 if (IS_ERR(nn->rec_file)) {
470 printk("NFSD: unable to find recovery directory %s\n",
471 user_recovery_dirname);
472 status = PTR_ERR(nn->rec_file);
473 nn->rec_file = NULL;
474 }
475
476 nfs4_reset_creds(original_cred);
477 if (!status)
478 nn->in_grace = true;
479 return status;
480}
481
482
483static int
484nfs4_legacy_state_init(struct net *net)
485{
486 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
487 int i;
488
489 nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
490 CLIENT_HASH_SIZE, GFP_KERNEL);
491 if (!nn->reclaim_str_hashtbl)
492 return -ENOMEM;
493
494 for (i = 0; i < CLIENT_HASH_SIZE; i++)
495 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
496 nn->reclaim_str_hashtbl_size = 0;
497
498 return 0;
499}
500
501static void
502nfs4_legacy_state_shutdown(struct net *net)
503{
504 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
505
506 kfree(nn->reclaim_str_hashtbl);
507}
508
509static int
510nfsd4_load_reboot_recovery_data(struct net *net)
511{
512 int status;
513
514 status = nfsd4_init_recdir(net);
515 if (!status)
516 status = nfsd4_recdir_load(net);
517 if (status)
518 printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
519 return status;
520}
521
522static int
523nfsd4_legacy_tracking_init(struct net *net)
524{
525 int status;
526
527 /* XXX: The legacy code won't work in a container */
528 if (net != &init_net) {
529 WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
530 "tracking in a container!\n");
531 return -EINVAL;
532 }
533
534 status = nfs4_legacy_state_init(net);
535 if (status)
536 return status;
537
538 status = nfsd4_load_reboot_recovery_data(net);
539 if (status)
540 goto err;
541 return 0;
542
543err:
544 nfs4_legacy_state_shutdown(net);
545 return status;
546}
547
548static void
549nfsd4_shutdown_recdir(struct nfsd_net *nn)
550{
551 if (!nn->rec_file)
552 return;
553 fput(nn->rec_file);
554 nn->rec_file = NULL;
555}
556
557static void
558nfsd4_legacy_tracking_exit(struct net *net)
559{
560 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
561
562 nfs4_release_reclaim(nn);
563 nfsd4_shutdown_recdir(nn);
564 nfs4_legacy_state_shutdown(net);
565}
566
567/*
568 * Change the NFSv4 recovery directory to recdir.
569 */
570int
571nfs4_reset_recoverydir(char *recdir)
572{
573 int status;
574 struct path path;
575
576 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
577 if (status)
578 return status;
579 status = -ENOTDIR;
580 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
581 strcpy(user_recovery_dirname, recdir);
582 status = 0;
583 }
584 path_put(&path);
585 return status;
586}
587
588char *
589nfs4_recoverydir(void)
590{
591 return user_recovery_dirname;
592}
593
594static int
595nfsd4_check_legacy_client(struct nfs4_client *clp)
596{
597 int status;
598 char dname[HEXDIR_LEN];
599 struct nfs4_client_reclaim *crp;
600 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
601
602 /* did we already find that this client is stable? */
603 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
604 return 0;
605
606 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
607 if (status) {
608 legacy_recdir_name_error(clp, status);
609 return status;
610 }
611
612 /* look for it in the reclaim hashtable otherwise */
613 crp = nfsd4_find_reclaim_client(dname, nn);
614 if (crp) {
615 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
616 crp->cr_clp = clp;
617 return 0;
618 }
619
620 return -ENOENT;
621}
622
623static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
624 .init = nfsd4_legacy_tracking_init,
625 .exit = nfsd4_legacy_tracking_exit,
626 .create = nfsd4_create_clid_dir,
627 .remove = nfsd4_remove_clid_dir,
628 .check = nfsd4_check_legacy_client,
629 .grace_done = nfsd4_recdir_purge_old,
630};
631
632/* Globals */
633#define NFSD_PIPE_DIR "nfsd"
634#define NFSD_CLD_PIPE "cld"
635
636/* per-net-ns structure for holding cld upcall info */
637struct cld_net {
638 struct rpc_pipe *cn_pipe;
639 spinlock_t cn_lock;
640 struct list_head cn_list;
641 unsigned int cn_xid;
642};
643
644struct cld_upcall {
645 struct list_head cu_list;
646 struct cld_net *cu_net;
647 struct task_struct *cu_task;
648 struct cld_msg cu_msg;
649};
650
651static int
652__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
653{
654 int ret;
655 struct rpc_pipe_msg msg;
656
657 memset(&msg, 0, sizeof(msg));
658 msg.data = cmsg;
659 msg.len = sizeof(*cmsg);
660
661 /*
662 * Set task state before we queue the upcall. That prevents
663 * wake_up_process in the downcall from racing with schedule.
664 */
665 set_current_state(TASK_UNINTERRUPTIBLE);
666 ret = rpc_queue_upcall(pipe, &msg);
667 if (ret < 0) {
668 set_current_state(TASK_RUNNING);
669 goto out;
670 }
671
672 schedule();
673 set_current_state(TASK_RUNNING);
674
675 if (msg.errno < 0)
676 ret = msg.errno;
677out:
678 return ret;
679}
680
681static int
682cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
683{
684 int ret;
685
686 /*
687 * -EAGAIN occurs when pipe is closed and reopened while there are
688 * upcalls queued.
689 */
690 do {
691 ret = __cld_pipe_upcall(pipe, cmsg);
692 } while (ret == -EAGAIN);
693
694 return ret;
695}
696
697static ssize_t
698cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
699{
700 struct cld_upcall *tmp, *cup;
701 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
702 uint32_t xid;
703 struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
704 nfsd_net_id);
705 struct cld_net *cn = nn->cld_net;
706
707 if (mlen != sizeof(*cmsg)) {
708 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
709 sizeof(*cmsg));
710 return -EINVAL;
711 }
712
713 /* copy just the xid so we can try to find that */
714 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
715 dprintk("%s: error when copying xid from userspace", __func__);
716 return -EFAULT;
717 }
718
719 /* walk the list and find corresponding xid */
720 cup = NULL;
721 spin_lock(&cn->cn_lock);
722 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
723 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
724 cup = tmp;
725 list_del_init(&cup->cu_list);
726 break;
727 }
728 }
729 spin_unlock(&cn->cn_lock);
730
731 /* couldn't find upcall? */
732 if (!cup) {
733 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
734 return -EINVAL;
735 }
736
737 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
738 return -EFAULT;
739
740 wake_up_process(cup->cu_task);
741 return mlen;
742}
743
744static void
745cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
746{
747 struct cld_msg *cmsg = msg->data;
748 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
749 cu_msg);
750
751 /* errno >= 0 means we got a downcall */
752 if (msg->errno >= 0)
753 return;
754
755 wake_up_process(cup->cu_task);
756}
757
758static const struct rpc_pipe_ops cld_upcall_ops = {
759 .upcall = rpc_pipe_generic_upcall,
760 .downcall = cld_pipe_downcall,
761 .destroy_msg = cld_pipe_destroy_msg,
762};
763
764static struct dentry *
765nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
766{
767 struct dentry *dir, *dentry;
768
769 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
770 if (dir == NULL)
771 return ERR_PTR(-ENOENT);
772 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
773 dput(dir);
774 return dentry;
775}
776
777static void
778nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
779{
780 if (pipe->dentry)
781 rpc_unlink(pipe->dentry);
782}
783
784static struct dentry *
785nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
786{
787 struct super_block *sb;
788 struct dentry *dentry;
789
790 sb = rpc_get_sb_net(net);
791 if (!sb)
792 return NULL;
793 dentry = nfsd4_cld_register_sb(sb, pipe);
794 rpc_put_sb_net(net);
795 return dentry;
796}
797
798static void
799nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
800{
801 struct super_block *sb;
802
803 sb = rpc_get_sb_net(net);
804 if (sb) {
805 nfsd4_cld_unregister_sb(pipe);
806 rpc_put_sb_net(net);
807 }
808}
809
810/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
811static int
812nfsd4_init_cld_pipe(struct net *net)
813{
814 int ret;
815 struct dentry *dentry;
816 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
817 struct cld_net *cn;
818
819 if (nn->cld_net)
820 return 0;
821
822 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
823 if (!cn) {
824 ret = -ENOMEM;
825 goto err;
826 }
827
828 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
829 if (IS_ERR(cn->cn_pipe)) {
830 ret = PTR_ERR(cn->cn_pipe);
831 goto err;
832 }
833 spin_lock_init(&cn->cn_lock);
834 INIT_LIST_HEAD(&cn->cn_list);
835
836 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
837 if (IS_ERR(dentry)) {
838 ret = PTR_ERR(dentry);
839 goto err_destroy_data;
840 }
841
842 cn->cn_pipe->dentry = dentry;
843 nn->cld_net = cn;
844 return 0;
845
846err_destroy_data:
847 rpc_destroy_pipe_data(cn->cn_pipe);
848err:
849 kfree(cn);
850 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
851 ret);
852 return ret;
853}
854
855static void
856nfsd4_remove_cld_pipe(struct net *net)
857{
858 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
859 struct cld_net *cn = nn->cld_net;
860
861 nfsd4_cld_unregister_net(net, cn->cn_pipe);
862 rpc_destroy_pipe_data(cn->cn_pipe);
863 kfree(nn->cld_net);
864 nn->cld_net = NULL;
865}
866
867static struct cld_upcall *
868alloc_cld_upcall(struct cld_net *cn)
869{
870 struct cld_upcall *new, *tmp;
871
872 new = kzalloc(sizeof(*new), GFP_KERNEL);
873 if (!new)
874 return new;
875
876 /* FIXME: hard cap on number in flight? */
877restart_search:
878 spin_lock(&cn->cn_lock);
879 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
880 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
881 cn->cn_xid++;
882 spin_unlock(&cn->cn_lock);
883 goto restart_search;
884 }
885 }
886 new->cu_task = current;
887 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
888 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
889 new->cu_net = cn;
890 list_add(&new->cu_list, &cn->cn_list);
891 spin_unlock(&cn->cn_lock);
892
893 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
894
895 return new;
896}
897
898static void
899free_cld_upcall(struct cld_upcall *victim)
900{
901 struct cld_net *cn = victim->cu_net;
902
903 spin_lock(&cn->cn_lock);
904 list_del(&victim->cu_list);
905 spin_unlock(&cn->cn_lock);
906 kfree(victim);
907}
908
909/* Ask daemon to create a new record */
910static void
911nfsd4_cld_create(struct nfs4_client *clp)
912{
913 int ret;
914 struct cld_upcall *cup;
915 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
916 struct cld_net *cn = nn->cld_net;
917
918 /* Don't upcall if it's already stored */
919 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
920 return;
921
922 cup = alloc_cld_upcall(cn);
923 if (!cup) {
924 ret = -ENOMEM;
925 goto out_err;
926 }
927
928 cup->cu_msg.cm_cmd = Cld_Create;
929 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
930 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
931 clp->cl_name.len);
932
933 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
934 if (!ret) {
935 ret = cup->cu_msg.cm_status;
936 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
937 }
938
939 free_cld_upcall(cup);
940out_err:
941 if (ret)
942 printk(KERN_ERR "NFSD: Unable to create client "
943 "record on stable storage: %d\n", ret);
944}
945
946/* Ask daemon to create a new record */
947static void
948nfsd4_cld_remove(struct nfs4_client *clp)
949{
950 int ret;
951 struct cld_upcall *cup;
952 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
953 struct cld_net *cn = nn->cld_net;
954
955 /* Don't upcall if it's already removed */
956 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
957 return;
958
959 cup = alloc_cld_upcall(cn);
960 if (!cup) {
961 ret = -ENOMEM;
962 goto out_err;
963 }
964
965 cup->cu_msg.cm_cmd = Cld_Remove;
966 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
967 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
968 clp->cl_name.len);
969
970 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
971 if (!ret) {
972 ret = cup->cu_msg.cm_status;
973 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
974 }
975
976 free_cld_upcall(cup);
977out_err:
978 if (ret)
979 printk(KERN_ERR "NFSD: Unable to remove client "
980 "record from stable storage: %d\n", ret);
981}
982
983/* Check for presence of a record, and update its timestamp */
984static int
985nfsd4_cld_check(struct nfs4_client *clp)
986{
987 int ret;
988 struct cld_upcall *cup;
989 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
990 struct cld_net *cn = nn->cld_net;
991
992 /* Don't upcall if one was already stored during this grace pd */
993 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
994 return 0;
995
996 cup = alloc_cld_upcall(cn);
997 if (!cup) {
998 printk(KERN_ERR "NFSD: Unable to check client record on "
999 "stable storage: %d\n", -ENOMEM);
1000 return -ENOMEM;
1001 }
1002
1003 cup->cu_msg.cm_cmd = Cld_Check;
1004 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1005 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1006 clp->cl_name.len);
1007
1008 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1009 if (!ret) {
1010 ret = cup->cu_msg.cm_status;
1011 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1012 }
1013
1014 free_cld_upcall(cup);
1015 return ret;
1016}
1017
1018static void
1019nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time)
1020{
1021 int ret;
1022 struct cld_upcall *cup;
1023 struct cld_net *cn = nn->cld_net;
1024
1025 cup = alloc_cld_upcall(cn);
1026 if (!cup) {
1027 ret = -ENOMEM;
1028 goto out_err;
1029 }
1030
1031 cup->cu_msg.cm_cmd = Cld_GraceDone;
1032 cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
1033 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1034 if (!ret)
1035 ret = cup->cu_msg.cm_status;
1036
1037 free_cld_upcall(cup);
1038out_err:
1039 if (ret)
1040 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1041}
1042
1043static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1044 .init = nfsd4_init_cld_pipe,
1045 .exit = nfsd4_remove_cld_pipe,
1046 .create = nfsd4_cld_create,
1047 .remove = nfsd4_cld_remove,
1048 .check = nfsd4_cld_check,
1049 .grace_done = nfsd4_cld_grace_done,
1050};
1051
1052/* upcall via usermodehelper */
1053static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1054module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1055 S_IRUGO|S_IWUSR);
1056MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1057
1058static bool cltrack_legacy_disable;
1059module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1060MODULE_PARM_DESC(cltrack_legacy_disable,
1061 "Disable legacy recoverydir conversion. Default: false");
1062
1063#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1064#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1065
1066static char *
1067nfsd4_cltrack_legacy_topdir(void)
1068{
1069 int copied;
1070 size_t len;
1071 char *result;
1072
1073 if (cltrack_legacy_disable)
1074 return NULL;
1075
1076 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1077 strlen(nfs4_recoverydir()) + 1;
1078
1079 result = kmalloc(len, GFP_KERNEL);
1080 if (!result)
1081 return result;
1082
1083 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1084 nfs4_recoverydir());
1085 if (copied >= len) {
1086 /* just return nothing if output was truncated */
1087 kfree(result);
1088 return NULL;
1089 }
1090
1091 return result;
1092}
1093
1094static char *
1095nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1096{
1097 int copied;
1098 size_t len;
1099 char *result;
1100
1101 if (cltrack_legacy_disable)
1102 return NULL;
1103
1104 /* +1 is for '/' between "topdir" and "recdir" */
1105 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1106 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1107
1108 result = kmalloc(len, GFP_KERNEL);
1109 if (!result)
1110 return result;
1111
1112 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1113 nfs4_recoverydir());
1114 if (copied > (len - HEXDIR_LEN)) {
1115 /* just return nothing if output will be truncated */
1116 kfree(result);
1117 return NULL;
1118 }
1119
1120 copied = nfs4_make_rec_clidname(result + copied, name);
1121 if (copied) {
1122 kfree(result);
1123 return NULL;
1124 }
1125
1126 return result;
1127}
1128
1129static int
1130nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy)
1131{
1132 char *envp[2];
1133 char *argv[4];
1134 int ret;
1135
1136 if (unlikely(!cltrack_prog[0])) {
1137 dprintk("%s: cltrack_prog is disabled\n", __func__);
1138 return -EACCES;
1139 }
1140
1141 dprintk("%s: cmd: %s\n", __func__, cmd);
1142 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1143 dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)");
1144
1145 envp[0] = legacy;
1146 envp[1] = NULL;
1147
1148 argv[0] = (char *)cltrack_prog;
1149 argv[1] = cmd;
1150 argv[2] = arg;
1151 argv[3] = NULL;
1152
1153 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1154 /*
1155 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1156 * error. The admin can re-enable it on the fly by using sysfs
1157 * once the problem has been fixed.
1158 */
1159 if (ret == -ENOENT || ret == -EACCES) {
1160 dprintk("NFSD: %s was not found or isn't executable (%d). "
1161 "Setting cltrack_prog to blank string!",
1162 cltrack_prog, ret);
1163 cltrack_prog[0] = '\0';
1164 }
1165 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1166
1167 return ret;
1168}
1169
1170static char *
1171bin_to_hex_dup(const unsigned char *src, int srclen)
1172{
1173 int i;
1174 char *buf, *hex;
1175
1176 /* +1 for terminating NULL */
1177 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1178 if (!buf)
1179 return buf;
1180
1181 hex = buf;
1182 for (i = 0; i < srclen; i++) {
1183 sprintf(hex, "%2.2x", *src++);
1184 hex += 2;
1185 }
1186 return buf;
1187}
1188
1189static int
1190nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net)
1191{
1192 /* XXX: The usermode helper s not working in container yet. */
1193 if (net != &init_net) {
1194 WARN(1, KERN_ERR "NFSD: attempt to initialize umh client "
1195 "tracking in a container!\n");
1196 return -EINVAL;
1197 }
1198 return nfsd4_umh_cltrack_upcall("init", NULL, NULL);
1199}
1200
1201static void
1202nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1203{
1204 char *hexid;
1205
1206 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1207 if (!hexid) {
1208 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1209 return;
1210 }
1211 nfsd4_umh_cltrack_upcall("create", hexid, NULL);
1212 kfree(hexid);
1213}
1214
1215static void
1216nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1217{
1218 char *hexid;
1219
1220 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1221 if (!hexid) {
1222 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1223 return;
1224 }
1225 nfsd4_umh_cltrack_upcall("remove", hexid, NULL);
1226 kfree(hexid);
1227}
1228
1229static int
1230nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1231{
1232 int ret;
1233 char *hexid, *legacy;
1234
1235 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1236 if (!hexid) {
1237 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1238 return -ENOMEM;
1239 }
1240 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1241 ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy);
1242 kfree(legacy);
1243 kfree(hexid);
1244 return ret;
1245}
1246
1247static void
1248nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn,
1249 time_t boot_time)
1250{
1251 char *legacy;
1252 char timestr[22]; /* FIXME: better way to determine max size? */
1253
1254 sprintf(timestr, "%ld", boot_time);
1255 legacy = nfsd4_cltrack_legacy_topdir();
1256 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy);
1257 kfree(legacy);
1258}
1259
1260static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1261 .init = nfsd4_umh_cltrack_init,
1262 .exit = NULL,
1263 .create = nfsd4_umh_cltrack_create,
1264 .remove = nfsd4_umh_cltrack_remove,
1265 .check = nfsd4_umh_cltrack_check,
1266 .grace_done = nfsd4_umh_cltrack_grace_done,
1267};
1268
1269int
1270nfsd4_client_tracking_init(struct net *net)
1271{
1272 int status;
1273 struct path path;
1274 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1275
1276 /* just run the init if it the method is already decided */
1277 if (nn->client_tracking_ops)
1278 goto do_init;
1279
1280 /*
1281 * First, try a UMH upcall. It should succeed or fail quickly, so
1282 * there's little harm in trying that first.
1283 */
1284 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
1285 status = nn->client_tracking_ops->init(net);
1286 if (!status)
1287 return status;
1288
1289 /*
1290 * See if the recoverydir exists and is a directory. If it is,
1291 * then use the legacy ops.
1292 */
1293 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
1294 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1295 if (!status) {
1296 status = S_ISDIR(path.dentry->d_inode->i_mode);
1297 path_put(&path);
1298 if (status)
1299 goto do_init;
1300 }
1301
1302 /* Finally, try to use nfsdcld */
1303 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1304 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1305 "removed in 3.10. Please transition to using "
1306 "nfsdcltrack.\n");
1307do_init:
1308 status = nn->client_tracking_ops->init(net);
1309 if (status) {
1310 printk(KERN_WARNING "NFSD: Unable to initialize client "
1311 "recovery tracking! (%d)\n", status);
1312 nn->client_tracking_ops = NULL;
1313 }
1314 return status;
1315}
1316
1317void
1318nfsd4_client_tracking_exit(struct net *net)
1319{
1320 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1321
1322 if (nn->client_tracking_ops) {
1323 if (nn->client_tracking_ops->exit)
1324 nn->client_tracking_ops->exit(net);
1325 nn->client_tracking_ops = NULL;
1326 }
1327}
1328
1329void
1330nfsd4_client_record_create(struct nfs4_client *clp)
1331{
1332 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1333
1334 if (nn->client_tracking_ops)
1335 nn->client_tracking_ops->create(clp);
1336}
1337
1338void
1339nfsd4_client_record_remove(struct nfs4_client *clp)
1340{
1341 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1342
1343 if (nn->client_tracking_ops)
1344 nn->client_tracking_ops->remove(clp);
1345}
1346
1347int
1348nfsd4_client_record_check(struct nfs4_client *clp)
1349{
1350 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1351
1352 if (nn->client_tracking_ops)
1353 return nn->client_tracking_ops->check(clp);
1354
1355 return -EOPNOTSUPP;
1356}
1357
1358void
1359nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
1360{
1361 if (nn->client_tracking_ops)
1362 nn->client_tracking_ops->grace_done(nn, boot_time);
1363}
1364
1365static int
1366rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1367{
1368 struct super_block *sb = ptr;
1369 struct net *net = sb->s_fs_info;
1370 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1371 struct cld_net *cn = nn->cld_net;
1372 struct dentry *dentry;
1373 int ret = 0;
1374
1375 if (!try_module_get(THIS_MODULE))
1376 return 0;
1377
1378 if (!cn) {
1379 module_put(THIS_MODULE);
1380 return 0;
1381 }
1382
1383 switch (event) {
1384 case RPC_PIPEFS_MOUNT:
1385 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1386 if (IS_ERR(dentry)) {
1387 ret = PTR_ERR(dentry);
1388 break;
1389 }
1390 cn->cn_pipe->dentry = dentry;
1391 break;
1392 case RPC_PIPEFS_UMOUNT:
1393 if (cn->cn_pipe->dentry)
1394 nfsd4_cld_unregister_sb(cn->cn_pipe);
1395 break;
1396 default:
1397 ret = -ENOTSUPP;
1398 break;
1399 }
1400 module_put(THIS_MODULE);
1401 return ret;
1402}
1403
1404static struct notifier_block nfsd4_cld_block = {
1405 .notifier_call = rpc_pipefs_event,
1406};
1407
1408int
1409register_cld_notifier(void)
1410{
1411 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1412}
1413
1414void
1415unregister_cld_notifier(void)
1416{
1417 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
1418}
1/*
2* Copyright (c) 2004 The Regents of the University of Michigan.
3* Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
4* All rights reserved.
5*
6* Andy Adamson <andros@citi.umich.edu>
7*
8* Redistribution and use in source and binary forms, with or without
9* modification, are permitted provided that the following conditions
10* are met:
11*
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.
20*
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.
32*
33*/
34
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>
40#include <linux/fs.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>
46
47#include "nfsd.h"
48#include "state.h"
49#include "vfs.h"
50#include "netns.h"
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Declarations */
55struct 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 *);
62 uint8_t version;
63 size_t msglen;
64};
65
66static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops;
67static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2;
68
69/* Globals */
70static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
71
72static int
73nfs4_save_creds(const struct cred **original_creds)
74{
75 struct cred *new;
76
77 new = prepare_creds();
78 if (!new)
79 return -ENOMEM;
80
81 new->fsuid = GLOBAL_ROOT_UID;
82 new->fsgid = GLOBAL_ROOT_GID;
83 *original_creds = override_creds(new);
84 put_cred(new);
85 return 0;
86}
87
88static void
89nfs4_reset_creds(const struct cred *original)
90{
91 revert_creds(original);
92}
93
94static void
95md5_to_hex(char *out, char *md5)
96{
97 int i;
98
99 for (i=0; i<16; i++) {
100 unsigned char c = md5[i];
101
102 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
103 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
104 }
105 *out = '\0';
106}
107
108static int
109nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
110{
111 struct xdr_netobj cksum;
112 struct crypto_shash *tfm;
113 int status;
114
115 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
116 clname->len, clname->data);
117 tfm = crypto_alloc_shash("md5", 0, 0);
118 if (IS_ERR(tfm)) {
119 status = PTR_ERR(tfm);
120 goto out_no_tfm;
121 }
122
123 cksum.len = crypto_shash_digestsize(tfm);
124 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
125 if (cksum.data == NULL) {
126 status = -ENOMEM;
127 goto out;
128 }
129
130 status = crypto_shash_tfm_digest(tfm, clname->data, clname->len,
131 cksum.data);
132 if (status)
133 goto out;
134
135 md5_to_hex(dname, cksum.data);
136
137 status = 0;
138out:
139 kfree(cksum.data);
140 crypto_free_shash(tfm);
141out_no_tfm:
142 return status;
143}
144
145/*
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.
149 */
150static void
151legacy_recdir_name_error(struct nfs4_client *clp, int error)
152{
153 printk(KERN_ERR "NFSD: unable to generate recoverydir "
154 "name (%d).\n", error);
155
156 /*
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.
160 */
161 if (error == -ENOENT) {
162 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
163 "Reboot recovery will not function correctly!\n");
164 nfsd4_client_tracking_exit(clp->net);
165 }
166}
167
168static void
169__nfsd4_create_reclaim_record_grace(struct nfs4_client *clp,
170 const char *dname, int len, struct nfsd_net *nn)
171{
172 struct xdr_netobj name;
173 struct xdr_netobj princhash = { .len = 0, .data = NULL };
174 struct nfs4_client_reclaim *crp;
175
176 name.data = kmemdup(dname, len, GFP_KERNEL);
177 if (!name.data) {
178 dprintk("%s: failed to allocate memory for name.data!\n",
179 __func__);
180 return;
181 }
182 name.len = len;
183 crp = nfs4_client_to_reclaim(name, princhash, nn);
184 if (!crp) {
185 kfree(name.data);
186 return;
187 }
188 crp->cr_clp = clp;
189}
190
191static void
192nfsd4_create_clid_dir(struct nfs4_client *clp)
193{
194 const struct cred *original_cred;
195 char dname[HEXDIR_LEN];
196 struct dentry *dir, *dentry;
197 int status;
198 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
199
200 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
201 return;
202 if (!nn->rec_file)
203 return;
204
205 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
206 if (status)
207 return legacy_recdir_name_error(clp, status);
208
209 status = nfs4_save_creds(&original_cred);
210 if (status < 0)
211 return;
212
213 status = mnt_want_write_file(nn->rec_file);
214 if (status)
215 goto out_creds;
216
217 dir = nn->rec_file->f_path.dentry;
218 /* lock the parent */
219 inode_lock(d_inode(dir));
220
221 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
222 if (IS_ERR(dentry)) {
223 status = PTR_ERR(dentry);
224 goto out_unlock;
225 }
226 if (d_really_is_positive(dentry))
227 /*
228 * In the 4.1 case, where we're called from
229 * reclaim_complete(), records from the previous reboot
230 * may still be left, so this is OK.
231 *
232 * In the 4.0 case, we should never get here; but we may
233 * as well be forgiving and just succeed silently.
234 */
235 goto out_put;
236 status = vfs_mkdir(&init_user_ns, d_inode(dir), dentry, S_IRWXU);
237out_put:
238 dput(dentry);
239out_unlock:
240 inode_unlock(d_inode(dir));
241 if (status == 0) {
242 if (nn->in_grace)
243 __nfsd4_create_reclaim_record_grace(clp, dname,
244 HEXDIR_LEN, nn);
245 vfs_fsync(nn->rec_file, 0);
246 } else {
247 printk(KERN_ERR "NFSD: failed to write recovery record"
248 " (err %d); please check that %s exists"
249 " and is writeable", status,
250 user_recovery_dirname);
251 }
252 mnt_drop_write_file(nn->rec_file);
253out_creds:
254 nfs4_reset_creds(original_cred);
255}
256
257typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
258
259struct name_list {
260 char name[HEXDIR_LEN];
261 struct list_head list;
262};
263
264struct nfs4_dir_ctx {
265 struct dir_context ctx;
266 struct list_head names;
267};
268
269static int
270nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
271 loff_t offset, u64 ino, unsigned int d_type)
272{
273 struct nfs4_dir_ctx *ctx =
274 container_of(__ctx, struct nfs4_dir_ctx, ctx);
275 struct name_list *entry;
276
277 if (namlen != HEXDIR_LEN - 1)
278 return 0;
279 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
280 if (entry == NULL)
281 return -ENOMEM;
282 memcpy(entry->name, name, HEXDIR_LEN - 1);
283 entry->name[HEXDIR_LEN - 1] = '\0';
284 list_add(&entry->list, &ctx->names);
285 return 0;
286}
287
288static int
289nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
290{
291 const struct cred *original_cred;
292 struct dentry *dir = nn->rec_file->f_path.dentry;
293 struct nfs4_dir_ctx ctx = {
294 .ctx.actor = nfsd4_build_namelist,
295 .names = LIST_HEAD_INIT(ctx.names)
296 };
297 struct name_list *entry, *tmp;
298 int status;
299
300 status = nfs4_save_creds(&original_cred);
301 if (status < 0)
302 return status;
303
304 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
305 if (status < 0) {
306 nfs4_reset_creds(original_cred);
307 return status;
308 }
309
310 status = iterate_dir(nn->rec_file, &ctx.ctx);
311 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
312
313 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
314 if (!status) {
315 struct dentry *dentry;
316 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
317 if (IS_ERR(dentry)) {
318 status = PTR_ERR(dentry);
319 break;
320 }
321 status = f(dir, dentry, nn);
322 dput(dentry);
323 }
324 list_del(&entry->list);
325 kfree(entry);
326 }
327 inode_unlock(d_inode(dir));
328 nfs4_reset_creds(original_cred);
329
330 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
331 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name);
332 list_del(&entry->list);
333 kfree(entry);
334 }
335 return status;
336}
337
338static int
339nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
340{
341 struct dentry *dir, *dentry;
342 int status;
343
344 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
345
346 dir = nn->rec_file->f_path.dentry;
347 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
348 dentry = lookup_one_len(name, dir, namlen);
349 if (IS_ERR(dentry)) {
350 status = PTR_ERR(dentry);
351 goto out_unlock;
352 }
353 status = -ENOENT;
354 if (d_really_is_negative(dentry))
355 goto out;
356 status = vfs_rmdir(&init_user_ns, d_inode(dir), dentry);
357out:
358 dput(dentry);
359out_unlock:
360 inode_unlock(d_inode(dir));
361 return status;
362}
363
364static void
365__nfsd4_remove_reclaim_record_grace(const char *dname, int len,
366 struct nfsd_net *nn)
367{
368 struct xdr_netobj name;
369 struct nfs4_client_reclaim *crp;
370
371 name.data = kmemdup(dname, len, GFP_KERNEL);
372 if (!name.data) {
373 dprintk("%s: failed to allocate memory for name.data!\n",
374 __func__);
375 return;
376 }
377 name.len = len;
378 crp = nfsd4_find_reclaim_client(name, nn);
379 kfree(name.data);
380 if (crp)
381 nfs4_remove_reclaim_record(crp, nn);
382}
383
384static void
385nfsd4_remove_clid_dir(struct nfs4_client *clp)
386{
387 const struct cred *original_cred;
388 char dname[HEXDIR_LEN];
389 int status;
390 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
391
392 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
393 return;
394
395 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
396 if (status)
397 return legacy_recdir_name_error(clp, status);
398
399 status = mnt_want_write_file(nn->rec_file);
400 if (status)
401 goto out;
402 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
403
404 status = nfs4_save_creds(&original_cred);
405 if (status < 0)
406 goto out_drop_write;
407
408 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
409 nfs4_reset_creds(original_cred);
410 if (status == 0) {
411 vfs_fsync(nn->rec_file, 0);
412 if (nn->in_grace)
413 __nfsd4_remove_reclaim_record_grace(dname,
414 HEXDIR_LEN, nn);
415 }
416out_drop_write:
417 mnt_drop_write_file(nn->rec_file);
418out:
419 if (status)
420 printk("NFSD: Failed to remove expired client state directory"
421 " %.*s\n", HEXDIR_LEN, dname);
422}
423
424static int
425purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
426{
427 int status;
428 struct xdr_netobj name;
429
430 if (child->d_name.len != HEXDIR_LEN - 1) {
431 printk("%s: illegal name %pd in recovery directory\n",
432 __func__, child);
433 /* Keep trying; maybe the others are OK: */
434 return 0;
435 }
436 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
437 if (!name.data) {
438 dprintk("%s: failed to allocate memory for name.data!\n",
439 __func__);
440 goto out;
441 }
442 name.len = HEXDIR_LEN;
443 if (nfs4_has_reclaimed_state(name, nn))
444 goto out_free;
445
446 status = vfs_rmdir(&init_user_ns, d_inode(parent), child);
447 if (status)
448 printk("failed to remove client recovery directory %pd\n",
449 child);
450out_free:
451 kfree(name.data);
452out:
453 /* Keep trying, success or failure: */
454 return 0;
455}
456
457static void
458nfsd4_recdir_purge_old(struct nfsd_net *nn)
459{
460 int status;
461
462 nn->in_grace = false;
463 if (!nn->rec_file)
464 return;
465 status = mnt_want_write_file(nn->rec_file);
466 if (status)
467 goto out;
468 status = nfsd4_list_rec_dir(purge_old, nn);
469 if (status == 0)
470 vfs_fsync(nn->rec_file, 0);
471 mnt_drop_write_file(nn->rec_file);
472out:
473 nfs4_release_reclaim(nn);
474 if (status)
475 printk("nfsd4: failed to purge old clients from recovery"
476 " directory %pD\n", nn->rec_file);
477}
478
479static int
480load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
481{
482 struct xdr_netobj name;
483 struct xdr_netobj princhash = { .len = 0, .data = NULL };
484
485 if (child->d_name.len != HEXDIR_LEN - 1) {
486 printk("%s: illegal name %pd in recovery directory\n",
487 __func__, child);
488 /* Keep trying; maybe the others are OK: */
489 return 0;
490 }
491 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
492 if (!name.data) {
493 dprintk("%s: failed to allocate memory for name.data!\n",
494 __func__);
495 goto out;
496 }
497 name.len = HEXDIR_LEN;
498 if (!nfs4_client_to_reclaim(name, princhash, nn))
499 kfree(name.data);
500out:
501 return 0;
502}
503
504static int
505nfsd4_recdir_load(struct net *net) {
506 int status;
507 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
508
509 if (!nn->rec_file)
510 return 0;
511
512 status = nfsd4_list_rec_dir(load_recdir, nn);
513 if (status)
514 printk("nfsd4: failed loading clients from recovery"
515 " directory %pD\n", nn->rec_file);
516 return status;
517}
518
519/*
520 * Hold reference to the recovery directory.
521 */
522
523static int
524nfsd4_init_recdir(struct net *net)
525{
526 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
527 const struct cred *original_cred;
528 int status;
529
530 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
531 user_recovery_dirname);
532
533 BUG_ON(nn->rec_file);
534
535 status = nfs4_save_creds(&original_cred);
536 if (status < 0) {
537 printk("NFSD: Unable to change credentials to find recovery"
538 " directory: error %d\n",
539 status);
540 return status;
541 }
542
543 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
544 if (IS_ERR(nn->rec_file)) {
545 printk("NFSD: unable to find recovery directory %s\n",
546 user_recovery_dirname);
547 status = PTR_ERR(nn->rec_file);
548 nn->rec_file = NULL;
549 }
550
551 nfs4_reset_creds(original_cred);
552 if (!status)
553 nn->in_grace = true;
554 return status;
555}
556
557static void
558nfsd4_shutdown_recdir(struct net *net)
559{
560 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
561
562 if (!nn->rec_file)
563 return;
564 fput(nn->rec_file);
565 nn->rec_file = NULL;
566}
567
568static int
569nfs4_legacy_state_init(struct net *net)
570{
571 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
572 int i;
573
574 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
575 sizeof(struct list_head),
576 GFP_KERNEL);
577 if (!nn->reclaim_str_hashtbl)
578 return -ENOMEM;
579
580 for (i = 0; i < CLIENT_HASH_SIZE; i++)
581 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
582 nn->reclaim_str_hashtbl_size = 0;
583
584 return 0;
585}
586
587static void
588nfs4_legacy_state_shutdown(struct net *net)
589{
590 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
591
592 kfree(nn->reclaim_str_hashtbl);
593}
594
595static int
596nfsd4_load_reboot_recovery_data(struct net *net)
597{
598 int status;
599
600 status = nfsd4_init_recdir(net);
601 if (status)
602 return status;
603
604 status = nfsd4_recdir_load(net);
605 if (status)
606 nfsd4_shutdown_recdir(net);
607
608 return status;
609}
610
611static int
612nfsd4_legacy_tracking_init(struct net *net)
613{
614 int status;
615
616 /* XXX: The legacy code won't work in a container */
617 if (net != &init_net) {
618 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n");
619 return -EINVAL;
620 }
621
622 status = nfs4_legacy_state_init(net);
623 if (status)
624 return status;
625
626 status = nfsd4_load_reboot_recovery_data(net);
627 if (status)
628 goto err;
629 pr_info("NFSD: Using legacy client tracking operations.\n");
630 return 0;
631
632err:
633 nfs4_legacy_state_shutdown(net);
634 return status;
635}
636
637static void
638nfsd4_legacy_tracking_exit(struct net *net)
639{
640 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
641
642 nfs4_release_reclaim(nn);
643 nfsd4_shutdown_recdir(net);
644 nfs4_legacy_state_shutdown(net);
645}
646
647/*
648 * Change the NFSv4 recovery directory to recdir.
649 */
650int
651nfs4_reset_recoverydir(char *recdir)
652{
653 int status;
654 struct path path;
655
656 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
657 if (status)
658 return status;
659 status = -ENOTDIR;
660 if (d_is_dir(path.dentry)) {
661 strcpy(user_recovery_dirname, recdir);
662 status = 0;
663 }
664 path_put(&path);
665 return status;
666}
667
668char *
669nfs4_recoverydir(void)
670{
671 return user_recovery_dirname;
672}
673
674static int
675nfsd4_check_legacy_client(struct nfs4_client *clp)
676{
677 int status;
678 char dname[HEXDIR_LEN];
679 struct nfs4_client_reclaim *crp;
680 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
681 struct xdr_netobj name;
682
683 /* did we already find that this client is stable? */
684 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
685 return 0;
686
687 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
688 if (status) {
689 legacy_recdir_name_error(clp, status);
690 return status;
691 }
692
693 /* look for it in the reclaim hashtable otherwise */
694 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
695 if (!name.data) {
696 dprintk("%s: failed to allocate memory for name.data!\n",
697 __func__);
698 goto out_enoent;
699 }
700 name.len = HEXDIR_LEN;
701 crp = nfsd4_find_reclaim_client(name, nn);
702 kfree(name.data);
703 if (crp) {
704 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
705 crp->cr_clp = clp;
706 return 0;
707 }
708
709out_enoent:
710 return -ENOENT;
711}
712
713static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
714 .init = nfsd4_legacy_tracking_init,
715 .exit = nfsd4_legacy_tracking_exit,
716 .create = nfsd4_create_clid_dir,
717 .remove = nfsd4_remove_clid_dir,
718 .check = nfsd4_check_legacy_client,
719 .grace_done = nfsd4_recdir_purge_old,
720 .version = 1,
721 .msglen = 0,
722};
723
724/* Globals */
725#define NFSD_PIPE_DIR "nfsd"
726#define NFSD_CLD_PIPE "cld"
727
728/* per-net-ns structure for holding cld upcall info */
729struct cld_net {
730 struct rpc_pipe *cn_pipe;
731 spinlock_t cn_lock;
732 struct list_head cn_list;
733 unsigned int cn_xid;
734 bool cn_has_legacy;
735 struct crypto_shash *cn_tfm;
736};
737
738struct cld_upcall {
739 struct list_head cu_list;
740 struct cld_net *cu_net;
741 struct completion cu_done;
742 union {
743 struct cld_msg_hdr cu_hdr;
744 struct cld_msg cu_msg;
745 struct cld_msg_v2 cu_msg_v2;
746 } cu_u;
747};
748
749static int
750__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn)
751{
752 int ret;
753 struct rpc_pipe_msg msg;
754 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u);
755
756 memset(&msg, 0, sizeof(msg));
757 msg.data = cmsg;
758 msg.len = nn->client_tracking_ops->msglen;
759
760 ret = rpc_queue_upcall(pipe, &msg);
761 if (ret < 0) {
762 goto out;
763 }
764
765 wait_for_completion(&cup->cu_done);
766
767 if (msg.errno < 0)
768 ret = msg.errno;
769out:
770 return ret;
771}
772
773static int
774cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn)
775{
776 int ret;
777
778 /*
779 * -EAGAIN occurs when pipe is closed and reopened while there are
780 * upcalls queued.
781 */
782 do {
783 ret = __cld_pipe_upcall(pipe, cmsg, nn);
784 } while (ret == -EAGAIN);
785
786 return ret;
787}
788
789static ssize_t
790__cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
791 struct nfsd_net *nn)
792{
793 uint8_t cmd, princhashlen;
794 struct xdr_netobj name, princhash = { .len = 0, .data = NULL };
795 uint16_t namelen;
796 struct cld_net *cn = nn->cld_net;
797
798 if (get_user(cmd, &cmsg->cm_cmd)) {
799 dprintk("%s: error when copying cmd from userspace", __func__);
800 return -EFAULT;
801 }
802 if (cmd == Cld_GraceStart) {
803 if (nn->client_tracking_ops->version >= 2) {
804 const struct cld_clntinfo __user *ci;
805
806 ci = &cmsg->cm_u.cm_clntinfo;
807 if (get_user(namelen, &ci->cc_name.cn_len))
808 return -EFAULT;
809 name.data = memdup_user(&ci->cc_name.cn_id, namelen);
810 if (IS_ERR_OR_NULL(name.data))
811 return -EFAULT;
812 name.len = namelen;
813 get_user(princhashlen, &ci->cc_princhash.cp_len);
814 if (princhashlen > 0) {
815 princhash.data = memdup_user(
816 &ci->cc_princhash.cp_data,
817 princhashlen);
818 if (IS_ERR_OR_NULL(princhash.data))
819 return -EFAULT;
820 princhash.len = princhashlen;
821 } else
822 princhash.len = 0;
823 } else {
824 const struct cld_name __user *cnm;
825
826 cnm = &cmsg->cm_u.cm_name;
827 if (get_user(namelen, &cnm->cn_len))
828 return -EFAULT;
829 name.data = memdup_user(&cnm->cn_id, namelen);
830 if (IS_ERR_OR_NULL(name.data))
831 return -EFAULT;
832 name.len = namelen;
833 }
834 if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) {
835 name.len = name.len - 5;
836 memmove(name.data, name.data + 5, name.len);
837 cn->cn_has_legacy = true;
838 }
839 if (!nfs4_client_to_reclaim(name, princhash, nn)) {
840 kfree(name.data);
841 kfree(princhash.data);
842 return -EFAULT;
843 }
844 return nn->client_tracking_ops->msglen;
845 }
846 return -EFAULT;
847}
848
849static ssize_t
850cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
851{
852 struct cld_upcall *tmp, *cup;
853 struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src;
854 struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src;
855 uint32_t xid;
856 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
857 nfsd_net_id);
858 struct cld_net *cn = nn->cld_net;
859 int16_t status;
860
861 if (mlen != nn->client_tracking_ops->msglen) {
862 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
863 nn->client_tracking_ops->msglen);
864 return -EINVAL;
865 }
866
867 /* copy just the xid so we can try to find that */
868 if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) {
869 dprintk("%s: error when copying xid from userspace", __func__);
870 return -EFAULT;
871 }
872
873 /*
874 * copy the status so we know whether to remove the upcall from the
875 * list (for -EINPROGRESS, we just want to make sure the xid is
876 * valid, not remove the upcall from the list)
877 */
878 if (get_user(status, &hdr->cm_status)) {
879 dprintk("%s: error when copying status from userspace", __func__);
880 return -EFAULT;
881 }
882
883 /* walk the list and find corresponding xid */
884 cup = NULL;
885 spin_lock(&cn->cn_lock);
886 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
887 if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) {
888 cup = tmp;
889 if (status != -EINPROGRESS)
890 list_del_init(&cup->cu_list);
891 break;
892 }
893 }
894 spin_unlock(&cn->cn_lock);
895
896 /* couldn't find upcall? */
897 if (!cup) {
898 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
899 return -EINVAL;
900 }
901
902 if (status == -EINPROGRESS)
903 return __cld_pipe_inprogress_downcall(cmsg, nn);
904
905 if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0)
906 return -EFAULT;
907
908 complete(&cup->cu_done);
909 return mlen;
910}
911
912static void
913cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
914{
915 struct cld_msg *cmsg = msg->data;
916 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
917 cu_u.cu_msg);
918
919 /* errno >= 0 means we got a downcall */
920 if (msg->errno >= 0)
921 return;
922
923 complete(&cup->cu_done);
924}
925
926static const struct rpc_pipe_ops cld_upcall_ops = {
927 .upcall = rpc_pipe_generic_upcall,
928 .downcall = cld_pipe_downcall,
929 .destroy_msg = cld_pipe_destroy_msg,
930};
931
932static struct dentry *
933nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
934{
935 struct dentry *dir, *dentry;
936
937 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
938 if (dir == NULL)
939 return ERR_PTR(-ENOENT);
940 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
941 dput(dir);
942 return dentry;
943}
944
945static void
946nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
947{
948 if (pipe->dentry)
949 rpc_unlink(pipe->dentry);
950}
951
952static struct dentry *
953nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
954{
955 struct super_block *sb;
956 struct dentry *dentry;
957
958 sb = rpc_get_sb_net(net);
959 if (!sb)
960 return NULL;
961 dentry = nfsd4_cld_register_sb(sb, pipe);
962 rpc_put_sb_net(net);
963 return dentry;
964}
965
966static void
967nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
968{
969 struct super_block *sb;
970
971 sb = rpc_get_sb_net(net);
972 if (sb) {
973 nfsd4_cld_unregister_sb(pipe);
974 rpc_put_sb_net(net);
975 }
976}
977
978/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
979static int
980__nfsd4_init_cld_pipe(struct net *net)
981{
982 int ret;
983 struct dentry *dentry;
984 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
985 struct cld_net *cn;
986
987 if (nn->cld_net)
988 return 0;
989
990 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
991 if (!cn) {
992 ret = -ENOMEM;
993 goto err;
994 }
995
996 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
997 if (IS_ERR(cn->cn_pipe)) {
998 ret = PTR_ERR(cn->cn_pipe);
999 goto err;
1000 }
1001 spin_lock_init(&cn->cn_lock);
1002 INIT_LIST_HEAD(&cn->cn_list);
1003
1004 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
1005 if (IS_ERR(dentry)) {
1006 ret = PTR_ERR(dentry);
1007 goto err_destroy_data;
1008 }
1009
1010 cn->cn_pipe->dentry = dentry;
1011 cn->cn_has_legacy = false;
1012 nn->cld_net = cn;
1013 return 0;
1014
1015err_destroy_data:
1016 rpc_destroy_pipe_data(cn->cn_pipe);
1017err:
1018 kfree(cn);
1019 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
1020 ret);
1021 return ret;
1022}
1023
1024static int
1025nfsd4_init_cld_pipe(struct net *net)
1026{
1027 int status;
1028
1029 status = __nfsd4_init_cld_pipe(net);
1030 if (!status)
1031 pr_info("NFSD: Using old nfsdcld client tracking operations.\n");
1032 return status;
1033}
1034
1035static void
1036nfsd4_remove_cld_pipe(struct net *net)
1037{
1038 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1039 struct cld_net *cn = nn->cld_net;
1040
1041 nfsd4_cld_unregister_net(net, cn->cn_pipe);
1042 rpc_destroy_pipe_data(cn->cn_pipe);
1043 if (cn->cn_tfm)
1044 crypto_free_shash(cn->cn_tfm);
1045 kfree(nn->cld_net);
1046 nn->cld_net = NULL;
1047}
1048
1049static struct cld_upcall *
1050alloc_cld_upcall(struct nfsd_net *nn)
1051{
1052 struct cld_upcall *new, *tmp;
1053 struct cld_net *cn = nn->cld_net;
1054
1055 new = kzalloc(sizeof(*new), GFP_KERNEL);
1056 if (!new)
1057 return new;
1058
1059 /* FIXME: hard cap on number in flight? */
1060restart_search:
1061 spin_lock(&cn->cn_lock);
1062 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
1063 if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) {
1064 cn->cn_xid++;
1065 spin_unlock(&cn->cn_lock);
1066 goto restart_search;
1067 }
1068 }
1069 init_completion(&new->cu_done);
1070 new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version;
1071 put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid);
1072 new->cu_net = cn;
1073 list_add(&new->cu_list, &cn->cn_list);
1074 spin_unlock(&cn->cn_lock);
1075
1076 dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid);
1077
1078 return new;
1079}
1080
1081static void
1082free_cld_upcall(struct cld_upcall *victim)
1083{
1084 struct cld_net *cn = victim->cu_net;
1085
1086 spin_lock(&cn->cn_lock);
1087 list_del(&victim->cu_list);
1088 spin_unlock(&cn->cn_lock);
1089 kfree(victim);
1090}
1091
1092/* Ask daemon to create a new record */
1093static void
1094nfsd4_cld_create(struct nfs4_client *clp)
1095{
1096 int ret;
1097 struct cld_upcall *cup;
1098 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1099 struct cld_net *cn = nn->cld_net;
1100
1101 /* Don't upcall if it's already stored */
1102 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1103 return;
1104
1105 cup = alloc_cld_upcall(nn);
1106 if (!cup) {
1107 ret = -ENOMEM;
1108 goto out_err;
1109 }
1110
1111 cup->cu_u.cu_msg.cm_cmd = Cld_Create;
1112 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1113 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1114 clp->cl_name.len);
1115
1116 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1117 if (!ret) {
1118 ret = cup->cu_u.cu_msg.cm_status;
1119 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1120 }
1121
1122 free_cld_upcall(cup);
1123out_err:
1124 if (ret)
1125 printk(KERN_ERR "NFSD: Unable to create client "
1126 "record on stable storage: %d\n", ret);
1127}
1128
1129/* Ask daemon to create a new record */
1130static void
1131nfsd4_cld_create_v2(struct nfs4_client *clp)
1132{
1133 int ret;
1134 struct cld_upcall *cup;
1135 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1136 struct cld_net *cn = nn->cld_net;
1137 struct cld_msg_v2 *cmsg;
1138 struct crypto_shash *tfm = cn->cn_tfm;
1139 struct xdr_netobj cksum;
1140 char *principal = NULL;
1141
1142 /* Don't upcall if it's already stored */
1143 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1144 return;
1145
1146 cup = alloc_cld_upcall(nn);
1147 if (!cup) {
1148 ret = -ENOMEM;
1149 goto out_err;
1150 }
1151
1152 cmsg = &cup->cu_u.cu_msg_v2;
1153 cmsg->cm_cmd = Cld_Create;
1154 cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len;
1155 memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data,
1156 clp->cl_name.len);
1157 if (clp->cl_cred.cr_raw_principal)
1158 principal = clp->cl_cred.cr_raw_principal;
1159 else if (clp->cl_cred.cr_principal)
1160 principal = clp->cl_cred.cr_principal;
1161 if (principal) {
1162 cksum.len = crypto_shash_digestsize(tfm);
1163 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1164 if (cksum.data == NULL) {
1165 ret = -ENOMEM;
1166 goto out;
1167 }
1168 ret = crypto_shash_tfm_digest(tfm, principal, strlen(principal),
1169 cksum.data);
1170 if (ret) {
1171 kfree(cksum.data);
1172 goto out;
1173 }
1174 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len;
1175 memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
1176 cksum.data, cksum.len);
1177 kfree(cksum.data);
1178 } else
1179 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0;
1180
1181 ret = cld_pipe_upcall(cn->cn_pipe, cmsg, nn);
1182 if (!ret) {
1183 ret = cmsg->cm_status;
1184 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1185 }
1186
1187out:
1188 free_cld_upcall(cup);
1189out_err:
1190 if (ret)
1191 pr_err("NFSD: Unable to create client record on stable storage: %d\n",
1192 ret);
1193}
1194
1195/* Ask daemon to create a new record */
1196static void
1197nfsd4_cld_remove(struct nfs4_client *clp)
1198{
1199 int ret;
1200 struct cld_upcall *cup;
1201 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1202 struct cld_net *cn = nn->cld_net;
1203
1204 /* Don't upcall if it's already removed */
1205 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1206 return;
1207
1208 cup = alloc_cld_upcall(nn);
1209 if (!cup) {
1210 ret = -ENOMEM;
1211 goto out_err;
1212 }
1213
1214 cup->cu_u.cu_msg.cm_cmd = Cld_Remove;
1215 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1216 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1217 clp->cl_name.len);
1218
1219 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1220 if (!ret) {
1221 ret = cup->cu_u.cu_msg.cm_status;
1222 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1223 }
1224
1225 free_cld_upcall(cup);
1226out_err:
1227 if (ret)
1228 printk(KERN_ERR "NFSD: Unable to remove client "
1229 "record from stable storage: %d\n", ret);
1230}
1231
1232/*
1233 * For older nfsdcld's that do not allow us to "slurp" the clients
1234 * from the tracking database during startup.
1235 *
1236 * Check for presence of a record, and update its timestamp
1237 */
1238static int
1239nfsd4_cld_check_v0(struct nfs4_client *clp)
1240{
1241 int ret;
1242 struct cld_upcall *cup;
1243 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1244 struct cld_net *cn = nn->cld_net;
1245
1246 /* Don't upcall if one was already stored during this grace pd */
1247 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1248 return 0;
1249
1250 cup = alloc_cld_upcall(nn);
1251 if (!cup) {
1252 printk(KERN_ERR "NFSD: Unable to check client record on "
1253 "stable storage: %d\n", -ENOMEM);
1254 return -ENOMEM;
1255 }
1256
1257 cup->cu_u.cu_msg.cm_cmd = Cld_Check;
1258 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1259 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1260 clp->cl_name.len);
1261
1262 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1263 if (!ret) {
1264 ret = cup->cu_u.cu_msg.cm_status;
1265 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1266 }
1267
1268 free_cld_upcall(cup);
1269 return ret;
1270}
1271
1272/*
1273 * For newer nfsdcld's that allow us to "slurp" the clients
1274 * from the tracking database during startup.
1275 *
1276 * Check for presence of a record in the reclaim_str_hashtbl
1277 */
1278static int
1279nfsd4_cld_check(struct nfs4_client *clp)
1280{
1281 struct nfs4_client_reclaim *crp;
1282 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1283 struct cld_net *cn = nn->cld_net;
1284 int status;
1285 char dname[HEXDIR_LEN];
1286 struct xdr_netobj name;
1287
1288 /* did we already find that this client is stable? */
1289 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1290 return 0;
1291
1292 /* look for it in the reclaim hashtable otherwise */
1293 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1294 if (crp)
1295 goto found;
1296
1297 if (cn->cn_has_legacy) {
1298 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1299 if (status)
1300 return -ENOENT;
1301
1302 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1303 if (!name.data) {
1304 dprintk("%s: failed to allocate memory for name.data!\n",
1305 __func__);
1306 return -ENOENT;
1307 }
1308 name.len = HEXDIR_LEN;
1309 crp = nfsd4_find_reclaim_client(name, nn);
1310 kfree(name.data);
1311 if (crp)
1312 goto found;
1313
1314 }
1315 return -ENOENT;
1316found:
1317 crp->cr_clp = clp;
1318 return 0;
1319}
1320
1321static int
1322nfsd4_cld_check_v2(struct nfs4_client *clp)
1323{
1324 struct nfs4_client_reclaim *crp;
1325 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1326 struct cld_net *cn = nn->cld_net;
1327 int status;
1328 char dname[HEXDIR_LEN];
1329 struct xdr_netobj name;
1330 struct crypto_shash *tfm = cn->cn_tfm;
1331 struct xdr_netobj cksum;
1332 char *principal = NULL;
1333
1334 /* did we already find that this client is stable? */
1335 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1336 return 0;
1337
1338 /* look for it in the reclaim hashtable otherwise */
1339 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1340 if (crp)
1341 goto found;
1342
1343 if (cn->cn_has_legacy) {
1344 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1345 if (status)
1346 return -ENOENT;
1347
1348 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1349 if (!name.data) {
1350 dprintk("%s: failed to allocate memory for name.data\n",
1351 __func__);
1352 return -ENOENT;
1353 }
1354 name.len = HEXDIR_LEN;
1355 crp = nfsd4_find_reclaim_client(name, nn);
1356 kfree(name.data);
1357 if (crp)
1358 goto found;
1359
1360 }
1361 return -ENOENT;
1362found:
1363 if (crp->cr_princhash.len) {
1364 if (clp->cl_cred.cr_raw_principal)
1365 principal = clp->cl_cred.cr_raw_principal;
1366 else if (clp->cl_cred.cr_principal)
1367 principal = clp->cl_cred.cr_principal;
1368 if (principal == NULL)
1369 return -ENOENT;
1370 cksum.len = crypto_shash_digestsize(tfm);
1371 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1372 if (cksum.data == NULL)
1373 return -ENOENT;
1374 status = crypto_shash_tfm_digest(tfm, principal,
1375 strlen(principal), cksum.data);
1376 if (status) {
1377 kfree(cksum.data);
1378 return -ENOENT;
1379 }
1380 if (memcmp(crp->cr_princhash.data, cksum.data,
1381 crp->cr_princhash.len)) {
1382 kfree(cksum.data);
1383 return -ENOENT;
1384 }
1385 kfree(cksum.data);
1386 }
1387 crp->cr_clp = clp;
1388 return 0;
1389}
1390
1391static int
1392nfsd4_cld_grace_start(struct nfsd_net *nn)
1393{
1394 int ret;
1395 struct cld_upcall *cup;
1396 struct cld_net *cn = nn->cld_net;
1397
1398 cup = alloc_cld_upcall(nn);
1399 if (!cup) {
1400 ret = -ENOMEM;
1401 goto out_err;
1402 }
1403
1404 cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart;
1405 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1406 if (!ret)
1407 ret = cup->cu_u.cu_msg.cm_status;
1408
1409 free_cld_upcall(cup);
1410out_err:
1411 if (ret)
1412 dprintk("%s: Unable to get clients from userspace: %d\n",
1413 __func__, ret);
1414 return ret;
1415}
1416
1417/* For older nfsdcld's that need cm_gracetime */
1418static void
1419nfsd4_cld_grace_done_v0(struct nfsd_net *nn)
1420{
1421 int ret;
1422 struct cld_upcall *cup;
1423 struct cld_net *cn = nn->cld_net;
1424
1425 cup = alloc_cld_upcall(nn);
1426 if (!cup) {
1427 ret = -ENOMEM;
1428 goto out_err;
1429 }
1430
1431 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1432 cup->cu_u.cu_msg.cm_u.cm_gracetime = nn->boot_time;
1433 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1434 if (!ret)
1435 ret = cup->cu_u.cu_msg.cm_status;
1436
1437 free_cld_upcall(cup);
1438out_err:
1439 if (ret)
1440 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1441}
1442
1443/*
1444 * For newer nfsdcld's that do not need cm_gracetime. We also need to call
1445 * nfs4_release_reclaim() to clear out the reclaim_str_hashtbl.
1446 */
1447static void
1448nfsd4_cld_grace_done(struct nfsd_net *nn)
1449{
1450 int ret;
1451 struct cld_upcall *cup;
1452 struct cld_net *cn = nn->cld_net;
1453
1454 cup = alloc_cld_upcall(nn);
1455 if (!cup) {
1456 ret = -ENOMEM;
1457 goto out_err;
1458 }
1459
1460 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1461 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1462 if (!ret)
1463 ret = cup->cu_u.cu_msg.cm_status;
1464
1465 free_cld_upcall(cup);
1466out_err:
1467 nfs4_release_reclaim(nn);
1468 if (ret)
1469 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1470}
1471
1472static int
1473nfs4_cld_state_init(struct net *net)
1474{
1475 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1476 int i;
1477
1478 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
1479 sizeof(struct list_head),
1480 GFP_KERNEL);
1481 if (!nn->reclaim_str_hashtbl)
1482 return -ENOMEM;
1483
1484 for (i = 0; i < CLIENT_HASH_SIZE; i++)
1485 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
1486 nn->reclaim_str_hashtbl_size = 0;
1487 nn->track_reclaim_completes = true;
1488 atomic_set(&nn->nr_reclaim_complete, 0);
1489
1490 return 0;
1491}
1492
1493static void
1494nfs4_cld_state_shutdown(struct net *net)
1495{
1496 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1497
1498 nn->track_reclaim_completes = false;
1499 kfree(nn->reclaim_str_hashtbl);
1500}
1501
1502static bool
1503cld_running(struct nfsd_net *nn)
1504{
1505 struct cld_net *cn = nn->cld_net;
1506 struct rpc_pipe *pipe = cn->cn_pipe;
1507
1508 return pipe->nreaders || pipe->nwriters;
1509}
1510
1511static int
1512nfsd4_cld_get_version(struct nfsd_net *nn)
1513{
1514 int ret = 0;
1515 struct cld_upcall *cup;
1516 struct cld_net *cn = nn->cld_net;
1517 uint8_t version;
1518
1519 cup = alloc_cld_upcall(nn);
1520 if (!cup) {
1521 ret = -ENOMEM;
1522 goto out_err;
1523 }
1524 cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion;
1525 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1526 if (!ret) {
1527 ret = cup->cu_u.cu_msg.cm_status;
1528 if (ret)
1529 goto out_free;
1530 version = cup->cu_u.cu_msg.cm_u.cm_version;
1531 dprintk("%s: userspace returned version %u\n",
1532 __func__, version);
1533 if (version < 1)
1534 version = 1;
1535 else if (version > CLD_UPCALL_VERSION)
1536 version = CLD_UPCALL_VERSION;
1537
1538 switch (version) {
1539 case 1:
1540 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1541 break;
1542 case 2:
1543 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2;
1544 break;
1545 default:
1546 break;
1547 }
1548 }
1549out_free:
1550 free_cld_upcall(cup);
1551out_err:
1552 if (ret)
1553 dprintk("%s: Unable to get version from userspace: %d\n",
1554 __func__, ret);
1555 return ret;
1556}
1557
1558static int
1559nfsd4_cld_tracking_init(struct net *net)
1560{
1561 int status;
1562 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1563 bool running;
1564 int retries = 10;
1565 struct crypto_shash *tfm;
1566
1567 status = nfs4_cld_state_init(net);
1568 if (status)
1569 return status;
1570
1571 status = __nfsd4_init_cld_pipe(net);
1572 if (status)
1573 goto err_shutdown;
1574
1575 /*
1576 * rpc pipe upcalls take 30 seconds to time out, so we don't want to
1577 * queue an upcall unless we know that nfsdcld is running (because we
1578 * want this to fail fast so that nfsd4_client_tracking_init() can try
1579 * the next client tracking method). nfsdcld should already be running
1580 * before nfsd is started, so the wait here is for nfsdcld to open the
1581 * pipefs file we just created.
1582 */
1583 while (!(running = cld_running(nn)) && retries--)
1584 msleep(100);
1585
1586 if (!running) {
1587 status = -ETIMEDOUT;
1588 goto err_remove;
1589 }
1590 tfm = crypto_alloc_shash("sha256", 0, 0);
1591 if (IS_ERR(tfm)) {
1592 status = PTR_ERR(tfm);
1593 goto err_remove;
1594 }
1595 nn->cld_net->cn_tfm = tfm;
1596
1597 status = nfsd4_cld_get_version(nn);
1598 if (status == -EOPNOTSUPP)
1599 pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n");
1600
1601 status = nfsd4_cld_grace_start(nn);
1602 if (status) {
1603 if (status == -EOPNOTSUPP)
1604 pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n");
1605 nfs4_release_reclaim(nn);
1606 goto err_remove;
1607 } else
1608 pr_info("NFSD: Using nfsdcld client tracking operations.\n");
1609 return 0;
1610
1611err_remove:
1612 nfsd4_remove_cld_pipe(net);
1613err_shutdown:
1614 nfs4_cld_state_shutdown(net);
1615 return status;
1616}
1617
1618static void
1619nfsd4_cld_tracking_exit(struct net *net)
1620{
1621 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1622
1623 nfs4_release_reclaim(nn);
1624 nfsd4_remove_cld_pipe(net);
1625 nfs4_cld_state_shutdown(net);
1626}
1627
1628/* For older nfsdcld's */
1629static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = {
1630 .init = nfsd4_init_cld_pipe,
1631 .exit = nfsd4_remove_cld_pipe,
1632 .create = nfsd4_cld_create,
1633 .remove = nfsd4_cld_remove,
1634 .check = nfsd4_cld_check_v0,
1635 .grace_done = nfsd4_cld_grace_done_v0,
1636 .version = 1,
1637 .msglen = sizeof(struct cld_msg),
1638};
1639
1640/* For newer nfsdcld's */
1641static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1642 .init = nfsd4_cld_tracking_init,
1643 .exit = nfsd4_cld_tracking_exit,
1644 .create = nfsd4_cld_create,
1645 .remove = nfsd4_cld_remove,
1646 .check = nfsd4_cld_check,
1647 .grace_done = nfsd4_cld_grace_done,
1648 .version = 1,
1649 .msglen = sizeof(struct cld_msg),
1650};
1651
1652/* v2 create/check ops include the principal, if available */
1653static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = {
1654 .init = nfsd4_cld_tracking_init,
1655 .exit = nfsd4_cld_tracking_exit,
1656 .create = nfsd4_cld_create_v2,
1657 .remove = nfsd4_cld_remove,
1658 .check = nfsd4_cld_check_v2,
1659 .grace_done = nfsd4_cld_grace_done,
1660 .version = 2,
1661 .msglen = sizeof(struct cld_msg_v2),
1662};
1663
1664/* upcall via usermodehelper */
1665static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1666module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1667 S_IRUGO|S_IWUSR);
1668MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1669
1670static bool cltrack_legacy_disable;
1671module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1672MODULE_PARM_DESC(cltrack_legacy_disable,
1673 "Disable legacy recoverydir conversion. Default: false");
1674
1675#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1676#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1677#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1678#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
1679
1680static char *
1681nfsd4_cltrack_legacy_topdir(void)
1682{
1683 int copied;
1684 size_t len;
1685 char *result;
1686
1687 if (cltrack_legacy_disable)
1688 return NULL;
1689
1690 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1691 strlen(nfs4_recoverydir()) + 1;
1692
1693 result = kmalloc(len, GFP_KERNEL);
1694 if (!result)
1695 return result;
1696
1697 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1698 nfs4_recoverydir());
1699 if (copied >= len) {
1700 /* just return nothing if output was truncated */
1701 kfree(result);
1702 return NULL;
1703 }
1704
1705 return result;
1706}
1707
1708static char *
1709nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1710{
1711 int copied;
1712 size_t len;
1713 char *result;
1714
1715 if (cltrack_legacy_disable)
1716 return NULL;
1717
1718 /* +1 is for '/' between "topdir" and "recdir" */
1719 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1720 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1721
1722 result = kmalloc(len, GFP_KERNEL);
1723 if (!result)
1724 return result;
1725
1726 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1727 nfs4_recoverydir());
1728 if (copied > (len - HEXDIR_LEN)) {
1729 /* just return nothing if output will be truncated */
1730 kfree(result);
1731 return NULL;
1732 }
1733
1734 copied = nfs4_make_rec_clidname(result + copied, name);
1735 if (copied) {
1736 kfree(result);
1737 return NULL;
1738 }
1739
1740 return result;
1741}
1742
1743static char *
1744nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
1745{
1746 int copied;
1747 size_t len;
1748 char *result;
1749
1750 /* prefix + Y/N character + terminating NULL */
1751 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1752
1753 result = kmalloc(len, GFP_KERNEL);
1754 if (!result)
1755 return result;
1756
1757 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1758 clp->cl_minorversion ? 'Y' : 'N');
1759 if (copied >= len) {
1760 /* just return nothing if output was truncated */
1761 kfree(result);
1762 return NULL;
1763 }
1764
1765 return result;
1766}
1767
1768static char *
1769nfsd4_cltrack_grace_start(time64_t grace_start)
1770{
1771 int copied;
1772 size_t len;
1773 char *result;
1774
1775 /* prefix + max width of int64_t string + terminating NULL */
1776 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1777
1778 result = kmalloc(len, GFP_KERNEL);
1779 if (!result)
1780 return result;
1781
1782 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%lld",
1783 grace_start);
1784 if (copied >= len) {
1785 /* just return nothing if output was truncated */
1786 kfree(result);
1787 return NULL;
1788 }
1789
1790 return result;
1791}
1792
1793static int
1794nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1795{
1796 char *envp[3];
1797 char *argv[4];
1798 int ret;
1799
1800 if (unlikely(!cltrack_prog[0])) {
1801 dprintk("%s: cltrack_prog is disabled\n", __func__);
1802 return -EACCES;
1803 }
1804
1805 dprintk("%s: cmd: %s\n", __func__, cmd);
1806 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1807 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1808 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
1809
1810 envp[0] = env0;
1811 envp[1] = env1;
1812 envp[2] = NULL;
1813
1814 argv[0] = (char *)cltrack_prog;
1815 argv[1] = cmd;
1816 argv[2] = arg;
1817 argv[3] = NULL;
1818
1819 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1820 /*
1821 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1822 * error. The admin can re-enable it on the fly by using sysfs
1823 * once the problem has been fixed.
1824 */
1825 if (ret == -ENOENT || ret == -EACCES) {
1826 dprintk("NFSD: %s was not found or isn't executable (%d). "
1827 "Setting cltrack_prog to blank string!",
1828 cltrack_prog, ret);
1829 cltrack_prog[0] = '\0';
1830 }
1831 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1832
1833 return ret;
1834}
1835
1836static char *
1837bin_to_hex_dup(const unsigned char *src, int srclen)
1838{
1839 char *buf;
1840
1841 /* +1 for terminating NULL */
1842 buf = kzalloc((srclen * 2) + 1, GFP_KERNEL);
1843 if (!buf)
1844 return buf;
1845
1846 bin2hex(buf, src, srclen);
1847 return buf;
1848}
1849
1850static int
1851nfsd4_umh_cltrack_init(struct net *net)
1852{
1853 int ret;
1854 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1855 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1856
1857 /* XXX: The usermode helper s not working in container yet. */
1858 if (net != &init_net) {
1859 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n");
1860 kfree(grace_start);
1861 return -EINVAL;
1862 }
1863
1864 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1865 kfree(grace_start);
1866 if (!ret)
1867 pr_info("NFSD: Using UMH upcall client tracking operations.\n");
1868 return ret;
1869}
1870
1871static void
1872nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1873{
1874 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1875 TASK_UNINTERRUPTIBLE);
1876}
1877
1878static void
1879nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1880{
1881 smp_mb__before_atomic();
1882 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1883 smp_mb__after_atomic();
1884 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
1885}
1886
1887static void
1888nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1889{
1890 char *hexid, *has_session, *grace_start;
1891 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1892
1893 /*
1894 * With v4.0 clients, there's little difference in outcome between a
1895 * create and check operation, and we can end up calling into this
1896 * function multiple times per client (once for each openowner). So,
1897 * for v4.0 clients skip upcalling once the client has been recorded
1898 * on stable storage.
1899 *
1900 * For v4.1+ clients, the outcome of the two operations is different,
1901 * so we must ensure that we upcall for the create operation. v4.1+
1902 * clients call this on RECLAIM_COMPLETE though, so we should only end
1903 * up doing a single create upcall per client.
1904 */
1905 if (clp->cl_minorversion == 0 &&
1906 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1907 return;
1908
1909 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1910 if (!hexid) {
1911 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1912 return;
1913 }
1914
1915 has_session = nfsd4_cltrack_client_has_session(clp);
1916 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1917
1918 nfsd4_cltrack_upcall_lock(clp);
1919 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1920 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1921 nfsd4_cltrack_upcall_unlock(clp);
1922
1923 kfree(has_session);
1924 kfree(grace_start);
1925 kfree(hexid);
1926}
1927
1928static void
1929nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1930{
1931 char *hexid;
1932
1933 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1934 return;
1935
1936 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1937 if (!hexid) {
1938 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1939 return;
1940 }
1941
1942 nfsd4_cltrack_upcall_lock(clp);
1943 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1944 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1945 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1946 nfsd4_cltrack_upcall_unlock(clp);
1947
1948 kfree(hexid);
1949}
1950
1951static int
1952nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1953{
1954 int ret;
1955 char *hexid, *has_session, *legacy;
1956
1957 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1958 return 0;
1959
1960 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1961 if (!hexid) {
1962 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1963 return -ENOMEM;
1964 }
1965
1966 has_session = nfsd4_cltrack_client_has_session(clp);
1967 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1968
1969 nfsd4_cltrack_upcall_lock(clp);
1970 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1971 ret = 0;
1972 } else {
1973 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1974 if (ret == 0)
1975 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1976 }
1977 nfsd4_cltrack_upcall_unlock(clp);
1978 kfree(has_session);
1979 kfree(legacy);
1980 kfree(hexid);
1981
1982 return ret;
1983}
1984
1985static void
1986nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
1987{
1988 char *legacy;
1989 char timestr[22]; /* FIXME: better way to determine max size? */
1990
1991 sprintf(timestr, "%lld", nn->boot_time);
1992 legacy = nfsd4_cltrack_legacy_topdir();
1993 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
1994 kfree(legacy);
1995}
1996
1997static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1998 .init = nfsd4_umh_cltrack_init,
1999 .exit = NULL,
2000 .create = nfsd4_umh_cltrack_create,
2001 .remove = nfsd4_umh_cltrack_remove,
2002 .check = nfsd4_umh_cltrack_check,
2003 .grace_done = nfsd4_umh_cltrack_grace_done,
2004 .version = 1,
2005 .msglen = 0,
2006};
2007
2008int
2009nfsd4_client_tracking_init(struct net *net)
2010{
2011 int status;
2012 struct path path;
2013 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2014
2015 /* just run the init if it the method is already decided */
2016 if (nn->client_tracking_ops)
2017 goto do_init;
2018
2019 /* First, try to use nfsdcld */
2020 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
2021 status = nn->client_tracking_ops->init(net);
2022 if (!status)
2023 return status;
2024 if (status != -ETIMEDOUT) {
2025 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0;
2026 status = nn->client_tracking_ops->init(net);
2027 if (!status)
2028 return status;
2029 }
2030
2031 /*
2032 * Next, try the UMH upcall.
2033 */
2034 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
2035 status = nn->client_tracking_ops->init(net);
2036 if (!status)
2037 return status;
2038
2039 /*
2040 * Finally, See if the recoverydir exists and is a directory.
2041 * If it is, then use the legacy ops.
2042 */
2043 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
2044 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
2045 if (!status) {
2046 status = d_is_dir(path.dentry);
2047 path_put(&path);
2048 if (!status) {
2049 status = -EINVAL;
2050 goto out;
2051 }
2052 }
2053
2054do_init:
2055 status = nn->client_tracking_ops->init(net);
2056out:
2057 if (status) {
2058 printk(KERN_WARNING "NFSD: Unable to initialize client "
2059 "recovery tracking! (%d)\n", status);
2060 nn->client_tracking_ops = NULL;
2061 }
2062 return status;
2063}
2064
2065void
2066nfsd4_client_tracking_exit(struct net *net)
2067{
2068 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2069
2070 if (nn->client_tracking_ops) {
2071 if (nn->client_tracking_ops->exit)
2072 nn->client_tracking_ops->exit(net);
2073 nn->client_tracking_ops = NULL;
2074 }
2075}
2076
2077void
2078nfsd4_client_record_create(struct nfs4_client *clp)
2079{
2080 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2081
2082 if (nn->client_tracking_ops)
2083 nn->client_tracking_ops->create(clp);
2084}
2085
2086void
2087nfsd4_client_record_remove(struct nfs4_client *clp)
2088{
2089 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2090
2091 if (nn->client_tracking_ops)
2092 nn->client_tracking_ops->remove(clp);
2093}
2094
2095int
2096nfsd4_client_record_check(struct nfs4_client *clp)
2097{
2098 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2099
2100 if (nn->client_tracking_ops)
2101 return nn->client_tracking_ops->check(clp);
2102
2103 return -EOPNOTSUPP;
2104}
2105
2106void
2107nfsd4_record_grace_done(struct nfsd_net *nn)
2108{
2109 if (nn->client_tracking_ops)
2110 nn->client_tracking_ops->grace_done(nn);
2111}
2112
2113static int
2114rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
2115{
2116 struct super_block *sb = ptr;
2117 struct net *net = sb->s_fs_info;
2118 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2119 struct cld_net *cn = nn->cld_net;
2120 struct dentry *dentry;
2121 int ret = 0;
2122
2123 if (!try_module_get(THIS_MODULE))
2124 return 0;
2125
2126 if (!cn) {
2127 module_put(THIS_MODULE);
2128 return 0;
2129 }
2130
2131 switch (event) {
2132 case RPC_PIPEFS_MOUNT:
2133 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
2134 if (IS_ERR(dentry)) {
2135 ret = PTR_ERR(dentry);
2136 break;
2137 }
2138 cn->cn_pipe->dentry = dentry;
2139 break;
2140 case RPC_PIPEFS_UMOUNT:
2141 if (cn->cn_pipe->dentry)
2142 nfsd4_cld_unregister_sb(cn->cn_pipe);
2143 break;
2144 default:
2145 ret = -ENOTSUPP;
2146 break;
2147 }
2148 module_put(THIS_MODULE);
2149 return ret;
2150}
2151
2152static struct notifier_block nfsd4_cld_block = {
2153 .notifier_call = rpc_pipefs_event,
2154};
2155
2156int
2157register_cld_notifier(void)
2158{
2159 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
2160}
2161
2162void
2163unregister_cld_notifier(void)
2164{
2165 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
2166}