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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};
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 crypto_shash *tfm;
108 int status;
109
110 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
111 clname->len, clname->data);
112 tfm = crypto_alloc_shash("md5", 0, 0);
113 if (IS_ERR(tfm)) {
114 status = PTR_ERR(tfm);
115 goto out_no_tfm;
116 }
117
118 cksum.len = crypto_shash_digestsize(tfm);
119 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
120 if (cksum.data == NULL) {
121 status = -ENOMEM;
122 goto out;
123 }
124
125 {
126 SHASH_DESC_ON_STACK(desc, tfm);
127
128 desc->tfm = tfm;
129 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
130
131 status = crypto_shash_digest(desc, clname->data, clname->len,
132 cksum.data);
133 shash_desc_zero(desc);
134 }
135
136 if (status)
137 goto out;
138
139 md5_to_hex(dname, cksum.data);
140
141 status = 0;
142out:
143 kfree(cksum.data);
144 crypto_free_shash(tfm);
145out_no_tfm:
146 return status;
147}
148
149/*
150 * If we had an error generating the recdir name for the legacy tracker
151 * then warn the admin. If the error doesn't appear to be transient,
152 * then disable recovery tracking.
153 */
154static void
155legacy_recdir_name_error(struct nfs4_client *clp, int error)
156{
157 printk(KERN_ERR "NFSD: unable to generate recoverydir "
158 "name (%d).\n", error);
159
160 /*
161 * if the algorithm just doesn't exist, then disable the recovery
162 * tracker altogether. The crypto libs will generally return this if
163 * FIPS is enabled as well.
164 */
165 if (error == -ENOENT) {
166 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
167 "Reboot recovery will not function correctly!\n");
168 nfsd4_client_tracking_exit(clp->net);
169 }
170}
171
172static void
173nfsd4_create_clid_dir(struct nfs4_client *clp)
174{
175 const struct cred *original_cred;
176 char dname[HEXDIR_LEN];
177 struct dentry *dir, *dentry;
178 struct nfs4_client_reclaim *crp;
179 int status;
180 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
181
182 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
183 return;
184 if (!nn->rec_file)
185 return;
186
187 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
188 if (status)
189 return legacy_recdir_name_error(clp, status);
190
191 status = nfs4_save_creds(&original_cred);
192 if (status < 0)
193 return;
194
195 status = mnt_want_write_file(nn->rec_file);
196 if (status)
197 goto out_creds;
198
199 dir = nn->rec_file->f_path.dentry;
200 /* lock the parent */
201 inode_lock(d_inode(dir));
202
203 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
204 if (IS_ERR(dentry)) {
205 status = PTR_ERR(dentry);
206 goto out_unlock;
207 }
208 if (d_really_is_positive(dentry))
209 /*
210 * In the 4.1 case, where we're called from
211 * reclaim_complete(), records from the previous reboot
212 * may still be left, so this is OK.
213 *
214 * In the 4.0 case, we should never get here; but we may
215 * as well be forgiving and just succeed silently.
216 */
217 goto out_put;
218 status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU);
219out_put:
220 dput(dentry);
221out_unlock:
222 inode_unlock(d_inode(dir));
223 if (status == 0) {
224 if (nn->in_grace) {
225 crp = nfs4_client_to_reclaim(dname, nn);
226 if (crp)
227 crp->cr_clp = clp;
228 }
229 vfs_fsync(nn->rec_file, 0);
230 } else {
231 printk(KERN_ERR "NFSD: failed to write recovery record"
232 " (err %d); please check that %s exists"
233 " and is writeable", status,
234 user_recovery_dirname);
235 }
236 mnt_drop_write_file(nn->rec_file);
237out_creds:
238 nfs4_reset_creds(original_cred);
239}
240
241typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
242
243struct name_list {
244 char name[HEXDIR_LEN];
245 struct list_head list;
246};
247
248struct nfs4_dir_ctx {
249 struct dir_context ctx;
250 struct list_head names;
251};
252
253static int
254nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
255 loff_t offset, u64 ino, unsigned int d_type)
256{
257 struct nfs4_dir_ctx *ctx =
258 container_of(__ctx, struct nfs4_dir_ctx, ctx);
259 struct name_list *entry;
260
261 if (namlen != HEXDIR_LEN - 1)
262 return 0;
263 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
264 if (entry == NULL)
265 return -ENOMEM;
266 memcpy(entry->name, name, HEXDIR_LEN - 1);
267 entry->name[HEXDIR_LEN - 1] = '\0';
268 list_add(&entry->list, &ctx->names);
269 return 0;
270}
271
272static int
273nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
274{
275 const struct cred *original_cred;
276 struct dentry *dir = nn->rec_file->f_path.dentry;
277 struct nfs4_dir_ctx ctx = {
278 .ctx.actor = nfsd4_build_namelist,
279 .names = LIST_HEAD_INIT(ctx.names)
280 };
281 struct name_list *entry, *tmp;
282 int status;
283
284 status = nfs4_save_creds(&original_cred);
285 if (status < 0)
286 return status;
287
288 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
289 if (status < 0) {
290 nfs4_reset_creds(original_cred);
291 return status;
292 }
293
294 status = iterate_dir(nn->rec_file, &ctx.ctx);
295 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
296
297 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
298 if (!status) {
299 struct dentry *dentry;
300 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
301 if (IS_ERR(dentry)) {
302 status = PTR_ERR(dentry);
303 break;
304 }
305 status = f(dir, dentry, nn);
306 dput(dentry);
307 }
308 list_del(&entry->list);
309 kfree(entry);
310 }
311 inode_unlock(d_inode(dir));
312 nfs4_reset_creds(original_cred);
313
314 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
315 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name);
316 list_del(&entry->list);
317 kfree(entry);
318 }
319 return status;
320}
321
322static int
323nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
324{
325 struct dentry *dir, *dentry;
326 int status;
327
328 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
329
330 dir = nn->rec_file->f_path.dentry;
331 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
332 dentry = lookup_one_len(name, dir, namlen);
333 if (IS_ERR(dentry)) {
334 status = PTR_ERR(dentry);
335 goto out_unlock;
336 }
337 status = -ENOENT;
338 if (d_really_is_negative(dentry))
339 goto out;
340 status = vfs_rmdir(d_inode(dir), dentry);
341out:
342 dput(dentry);
343out_unlock:
344 inode_unlock(d_inode(dir));
345 return status;
346}
347
348static void
349nfsd4_remove_clid_dir(struct nfs4_client *clp)
350{
351 const struct cred *original_cred;
352 struct nfs4_client_reclaim *crp;
353 char dname[HEXDIR_LEN];
354 int status;
355 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
356
357 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
358 return;
359
360 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
361 if (status)
362 return legacy_recdir_name_error(clp, status);
363
364 status = mnt_want_write_file(nn->rec_file);
365 if (status)
366 goto out;
367 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
368
369 status = nfs4_save_creds(&original_cred);
370 if (status < 0)
371 goto out_drop_write;
372
373 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
374 nfs4_reset_creds(original_cred);
375 if (status == 0) {
376 vfs_fsync(nn->rec_file, 0);
377 if (nn->in_grace) {
378 /* remove reclaim record */
379 crp = nfsd4_find_reclaim_client(dname, nn);
380 if (crp)
381 nfs4_remove_reclaim_record(crp, nn);
382 }
383 }
384out_drop_write:
385 mnt_drop_write_file(nn->rec_file);
386out:
387 if (status)
388 printk("NFSD: Failed to remove expired client state directory"
389 " %.*s\n", HEXDIR_LEN, dname);
390}
391
392static int
393purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
394{
395 int status;
396
397 if (nfs4_has_reclaimed_state(child->d_name.name, nn))
398 return 0;
399
400 status = vfs_rmdir(d_inode(parent), child);
401 if (status)
402 printk("failed to remove client recovery directory %pd\n",
403 child);
404 /* Keep trying, success or failure: */
405 return 0;
406}
407
408static void
409nfsd4_recdir_purge_old(struct nfsd_net *nn)
410{
411 int status;
412
413 nn->in_grace = false;
414 if (!nn->rec_file)
415 return;
416 status = mnt_want_write_file(nn->rec_file);
417 if (status)
418 goto out;
419 status = nfsd4_list_rec_dir(purge_old, nn);
420 if (status == 0)
421 vfs_fsync(nn->rec_file, 0);
422 mnt_drop_write_file(nn->rec_file);
423out:
424 nfs4_release_reclaim(nn);
425 if (status)
426 printk("nfsd4: failed to purge old clients from recovery"
427 " directory %pD\n", nn->rec_file);
428}
429
430static int
431load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
432{
433 if (child->d_name.len != HEXDIR_LEN - 1) {
434 printk("nfsd4: illegal name %pd in recovery directory\n",
435 child);
436 /* Keep trying; maybe the others are OK: */
437 return 0;
438 }
439 nfs4_client_to_reclaim(child->d_name.name, nn);
440 return 0;
441}
442
443static int
444nfsd4_recdir_load(struct net *net) {
445 int status;
446 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
447
448 if (!nn->rec_file)
449 return 0;
450
451 status = nfsd4_list_rec_dir(load_recdir, nn);
452 if (status)
453 printk("nfsd4: failed loading clients from recovery"
454 " directory %pD\n", nn->rec_file);
455 return status;
456}
457
458/*
459 * Hold reference to the recovery directory.
460 */
461
462static int
463nfsd4_init_recdir(struct net *net)
464{
465 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
466 const struct cred *original_cred;
467 int status;
468
469 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
470 user_recovery_dirname);
471
472 BUG_ON(nn->rec_file);
473
474 status = nfs4_save_creds(&original_cred);
475 if (status < 0) {
476 printk("NFSD: Unable to change credentials to find recovery"
477 " directory: error %d\n",
478 status);
479 return status;
480 }
481
482 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
483 if (IS_ERR(nn->rec_file)) {
484 printk("NFSD: unable to find recovery directory %s\n",
485 user_recovery_dirname);
486 status = PTR_ERR(nn->rec_file);
487 nn->rec_file = NULL;
488 }
489
490 nfs4_reset_creds(original_cred);
491 if (!status)
492 nn->in_grace = true;
493 return status;
494}
495
496static void
497nfsd4_shutdown_recdir(struct net *net)
498{
499 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
500
501 if (!nn->rec_file)
502 return;
503 fput(nn->rec_file);
504 nn->rec_file = NULL;
505}
506
507static int
508nfs4_legacy_state_init(struct net *net)
509{
510 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
511 int i;
512
513 nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
514 CLIENT_HASH_SIZE, GFP_KERNEL);
515 if (!nn->reclaim_str_hashtbl)
516 return -ENOMEM;
517
518 for (i = 0; i < CLIENT_HASH_SIZE; i++)
519 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
520 nn->reclaim_str_hashtbl_size = 0;
521
522 return 0;
523}
524
525static void
526nfs4_legacy_state_shutdown(struct net *net)
527{
528 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
529
530 kfree(nn->reclaim_str_hashtbl);
531}
532
533static int
534nfsd4_load_reboot_recovery_data(struct net *net)
535{
536 int status;
537
538 status = nfsd4_init_recdir(net);
539 if (status)
540 return status;
541
542 status = nfsd4_recdir_load(net);
543 if (status)
544 nfsd4_shutdown_recdir(net);
545
546 return status;
547}
548
549static int
550nfsd4_legacy_tracking_init(struct net *net)
551{
552 int status;
553
554 /* XXX: The legacy code won't work in a container */
555 if (net != &init_net) {
556 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n");
557 return -EINVAL;
558 }
559
560 status = nfs4_legacy_state_init(net);
561 if (status)
562 return status;
563
564 status = nfsd4_load_reboot_recovery_data(net);
565 if (status)
566 goto err;
567 return 0;
568
569err:
570 nfs4_legacy_state_shutdown(net);
571 return status;
572}
573
574static void
575nfsd4_legacy_tracking_exit(struct net *net)
576{
577 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
578
579 nfs4_release_reclaim(nn);
580 nfsd4_shutdown_recdir(net);
581 nfs4_legacy_state_shutdown(net);
582}
583
584/*
585 * Change the NFSv4 recovery directory to recdir.
586 */
587int
588nfs4_reset_recoverydir(char *recdir)
589{
590 int status;
591 struct path path;
592
593 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
594 if (status)
595 return status;
596 status = -ENOTDIR;
597 if (d_is_dir(path.dentry)) {
598 strcpy(user_recovery_dirname, recdir);
599 status = 0;
600 }
601 path_put(&path);
602 return status;
603}
604
605char *
606nfs4_recoverydir(void)
607{
608 return user_recovery_dirname;
609}
610
611static int
612nfsd4_check_legacy_client(struct nfs4_client *clp)
613{
614 int status;
615 char dname[HEXDIR_LEN];
616 struct nfs4_client_reclaim *crp;
617 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
618
619 /* did we already find that this client is stable? */
620 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
621 return 0;
622
623 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
624 if (status) {
625 legacy_recdir_name_error(clp, status);
626 return status;
627 }
628
629 /* look for it in the reclaim hashtable otherwise */
630 crp = nfsd4_find_reclaim_client(dname, nn);
631 if (crp) {
632 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
633 crp->cr_clp = clp;
634 return 0;
635 }
636
637 return -ENOENT;
638}
639
640static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
641 .init = nfsd4_legacy_tracking_init,
642 .exit = nfsd4_legacy_tracking_exit,
643 .create = nfsd4_create_clid_dir,
644 .remove = nfsd4_remove_clid_dir,
645 .check = nfsd4_check_legacy_client,
646 .grace_done = nfsd4_recdir_purge_old,
647};
648
649/* Globals */
650#define NFSD_PIPE_DIR "nfsd"
651#define NFSD_CLD_PIPE "cld"
652
653/* per-net-ns structure for holding cld upcall info */
654struct cld_net {
655 struct rpc_pipe *cn_pipe;
656 spinlock_t cn_lock;
657 struct list_head cn_list;
658 unsigned int cn_xid;
659};
660
661struct cld_upcall {
662 struct list_head cu_list;
663 struct cld_net *cu_net;
664 struct task_struct *cu_task;
665 struct cld_msg cu_msg;
666};
667
668static int
669__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
670{
671 int ret;
672 struct rpc_pipe_msg msg;
673
674 memset(&msg, 0, sizeof(msg));
675 msg.data = cmsg;
676 msg.len = sizeof(*cmsg);
677
678 /*
679 * Set task state before we queue the upcall. That prevents
680 * wake_up_process in the downcall from racing with schedule.
681 */
682 set_current_state(TASK_UNINTERRUPTIBLE);
683 ret = rpc_queue_upcall(pipe, &msg);
684 if (ret < 0) {
685 set_current_state(TASK_RUNNING);
686 goto out;
687 }
688
689 schedule();
690
691 if (msg.errno < 0)
692 ret = msg.errno;
693out:
694 return ret;
695}
696
697static int
698cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
699{
700 int ret;
701
702 /*
703 * -EAGAIN occurs when pipe is closed and reopened while there are
704 * upcalls queued.
705 */
706 do {
707 ret = __cld_pipe_upcall(pipe, cmsg);
708 } while (ret == -EAGAIN);
709
710 return ret;
711}
712
713static ssize_t
714cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
715{
716 struct cld_upcall *tmp, *cup;
717 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
718 uint32_t xid;
719 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
720 nfsd_net_id);
721 struct cld_net *cn = nn->cld_net;
722
723 if (mlen != sizeof(*cmsg)) {
724 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
725 sizeof(*cmsg));
726 return -EINVAL;
727 }
728
729 /* copy just the xid so we can try to find that */
730 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
731 dprintk("%s: error when copying xid from userspace", __func__);
732 return -EFAULT;
733 }
734
735 /* walk the list and find corresponding xid */
736 cup = NULL;
737 spin_lock(&cn->cn_lock);
738 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
739 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
740 cup = tmp;
741 list_del_init(&cup->cu_list);
742 break;
743 }
744 }
745 spin_unlock(&cn->cn_lock);
746
747 /* couldn't find upcall? */
748 if (!cup) {
749 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
750 return -EINVAL;
751 }
752
753 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
754 return -EFAULT;
755
756 wake_up_process(cup->cu_task);
757 return mlen;
758}
759
760static void
761cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
762{
763 struct cld_msg *cmsg = msg->data;
764 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
765 cu_msg);
766
767 /* errno >= 0 means we got a downcall */
768 if (msg->errno >= 0)
769 return;
770
771 wake_up_process(cup->cu_task);
772}
773
774static const struct rpc_pipe_ops cld_upcall_ops = {
775 .upcall = rpc_pipe_generic_upcall,
776 .downcall = cld_pipe_downcall,
777 .destroy_msg = cld_pipe_destroy_msg,
778};
779
780static struct dentry *
781nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
782{
783 struct dentry *dir, *dentry;
784
785 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
786 if (dir == NULL)
787 return ERR_PTR(-ENOENT);
788 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
789 dput(dir);
790 return dentry;
791}
792
793static void
794nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
795{
796 if (pipe->dentry)
797 rpc_unlink(pipe->dentry);
798}
799
800static struct dentry *
801nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
802{
803 struct super_block *sb;
804 struct dentry *dentry;
805
806 sb = rpc_get_sb_net(net);
807 if (!sb)
808 return NULL;
809 dentry = nfsd4_cld_register_sb(sb, pipe);
810 rpc_put_sb_net(net);
811 return dentry;
812}
813
814static void
815nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
816{
817 struct super_block *sb;
818
819 sb = rpc_get_sb_net(net);
820 if (sb) {
821 nfsd4_cld_unregister_sb(pipe);
822 rpc_put_sb_net(net);
823 }
824}
825
826/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
827static int
828nfsd4_init_cld_pipe(struct net *net)
829{
830 int ret;
831 struct dentry *dentry;
832 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
833 struct cld_net *cn;
834
835 if (nn->cld_net)
836 return 0;
837
838 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
839 if (!cn) {
840 ret = -ENOMEM;
841 goto err;
842 }
843
844 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
845 if (IS_ERR(cn->cn_pipe)) {
846 ret = PTR_ERR(cn->cn_pipe);
847 goto err;
848 }
849 spin_lock_init(&cn->cn_lock);
850 INIT_LIST_HEAD(&cn->cn_list);
851
852 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
853 if (IS_ERR(dentry)) {
854 ret = PTR_ERR(dentry);
855 goto err_destroy_data;
856 }
857
858 cn->cn_pipe->dentry = dentry;
859 nn->cld_net = cn;
860 return 0;
861
862err_destroy_data:
863 rpc_destroy_pipe_data(cn->cn_pipe);
864err:
865 kfree(cn);
866 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
867 ret);
868 return ret;
869}
870
871static void
872nfsd4_remove_cld_pipe(struct net *net)
873{
874 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
875 struct cld_net *cn = nn->cld_net;
876
877 nfsd4_cld_unregister_net(net, cn->cn_pipe);
878 rpc_destroy_pipe_data(cn->cn_pipe);
879 kfree(nn->cld_net);
880 nn->cld_net = NULL;
881}
882
883static struct cld_upcall *
884alloc_cld_upcall(struct cld_net *cn)
885{
886 struct cld_upcall *new, *tmp;
887
888 new = kzalloc(sizeof(*new), GFP_KERNEL);
889 if (!new)
890 return new;
891
892 /* FIXME: hard cap on number in flight? */
893restart_search:
894 spin_lock(&cn->cn_lock);
895 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
896 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
897 cn->cn_xid++;
898 spin_unlock(&cn->cn_lock);
899 goto restart_search;
900 }
901 }
902 new->cu_task = current;
903 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
904 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
905 new->cu_net = cn;
906 list_add(&new->cu_list, &cn->cn_list);
907 spin_unlock(&cn->cn_lock);
908
909 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
910
911 return new;
912}
913
914static void
915free_cld_upcall(struct cld_upcall *victim)
916{
917 struct cld_net *cn = victim->cu_net;
918
919 spin_lock(&cn->cn_lock);
920 list_del(&victim->cu_list);
921 spin_unlock(&cn->cn_lock);
922 kfree(victim);
923}
924
925/* Ask daemon to create a new record */
926static void
927nfsd4_cld_create(struct nfs4_client *clp)
928{
929 int ret;
930 struct cld_upcall *cup;
931 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
932 struct cld_net *cn = nn->cld_net;
933
934 /* Don't upcall if it's already stored */
935 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
936 return;
937
938 cup = alloc_cld_upcall(cn);
939 if (!cup) {
940 ret = -ENOMEM;
941 goto out_err;
942 }
943
944 cup->cu_msg.cm_cmd = Cld_Create;
945 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
946 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
947 clp->cl_name.len);
948
949 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
950 if (!ret) {
951 ret = cup->cu_msg.cm_status;
952 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
953 }
954
955 free_cld_upcall(cup);
956out_err:
957 if (ret)
958 printk(KERN_ERR "NFSD: Unable to create client "
959 "record on stable storage: %d\n", ret);
960}
961
962/* Ask daemon to create a new record */
963static void
964nfsd4_cld_remove(struct nfs4_client *clp)
965{
966 int ret;
967 struct cld_upcall *cup;
968 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
969 struct cld_net *cn = nn->cld_net;
970
971 /* Don't upcall if it's already removed */
972 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
973 return;
974
975 cup = alloc_cld_upcall(cn);
976 if (!cup) {
977 ret = -ENOMEM;
978 goto out_err;
979 }
980
981 cup->cu_msg.cm_cmd = Cld_Remove;
982 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
983 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
984 clp->cl_name.len);
985
986 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
987 if (!ret) {
988 ret = cup->cu_msg.cm_status;
989 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
990 }
991
992 free_cld_upcall(cup);
993out_err:
994 if (ret)
995 printk(KERN_ERR "NFSD: Unable to remove client "
996 "record from stable storage: %d\n", ret);
997}
998
999/* Check for presence of a record, and update its timestamp */
1000static int
1001nfsd4_cld_check(struct nfs4_client *clp)
1002{
1003 int ret;
1004 struct cld_upcall *cup;
1005 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1006 struct cld_net *cn = nn->cld_net;
1007
1008 /* Don't upcall if one was already stored during this grace pd */
1009 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1010 return 0;
1011
1012 cup = alloc_cld_upcall(cn);
1013 if (!cup) {
1014 printk(KERN_ERR "NFSD: Unable to check client record on "
1015 "stable storage: %d\n", -ENOMEM);
1016 return -ENOMEM;
1017 }
1018
1019 cup->cu_msg.cm_cmd = Cld_Check;
1020 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1021 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1022 clp->cl_name.len);
1023
1024 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1025 if (!ret) {
1026 ret = cup->cu_msg.cm_status;
1027 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1028 }
1029
1030 free_cld_upcall(cup);
1031 return ret;
1032}
1033
1034static void
1035nfsd4_cld_grace_done(struct nfsd_net *nn)
1036{
1037 int ret;
1038 struct cld_upcall *cup;
1039 struct cld_net *cn = nn->cld_net;
1040
1041 cup = alloc_cld_upcall(cn);
1042 if (!cup) {
1043 ret = -ENOMEM;
1044 goto out_err;
1045 }
1046
1047 cup->cu_msg.cm_cmd = Cld_GraceDone;
1048 cup->cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time;
1049 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1050 if (!ret)
1051 ret = cup->cu_msg.cm_status;
1052
1053 free_cld_upcall(cup);
1054out_err:
1055 if (ret)
1056 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1057}
1058
1059static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1060 .init = nfsd4_init_cld_pipe,
1061 .exit = nfsd4_remove_cld_pipe,
1062 .create = nfsd4_cld_create,
1063 .remove = nfsd4_cld_remove,
1064 .check = nfsd4_cld_check,
1065 .grace_done = nfsd4_cld_grace_done,
1066};
1067
1068/* upcall via usermodehelper */
1069static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1070module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1071 S_IRUGO|S_IWUSR);
1072MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1073
1074static bool cltrack_legacy_disable;
1075module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1076MODULE_PARM_DESC(cltrack_legacy_disable,
1077 "Disable legacy recoverydir conversion. Default: false");
1078
1079#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1080#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1081#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1082#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
1083
1084static char *
1085nfsd4_cltrack_legacy_topdir(void)
1086{
1087 int copied;
1088 size_t len;
1089 char *result;
1090
1091 if (cltrack_legacy_disable)
1092 return NULL;
1093
1094 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1095 strlen(nfs4_recoverydir()) + 1;
1096
1097 result = kmalloc(len, GFP_KERNEL);
1098 if (!result)
1099 return result;
1100
1101 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1102 nfs4_recoverydir());
1103 if (copied >= len) {
1104 /* just return nothing if output was truncated */
1105 kfree(result);
1106 return NULL;
1107 }
1108
1109 return result;
1110}
1111
1112static char *
1113nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1114{
1115 int copied;
1116 size_t len;
1117 char *result;
1118
1119 if (cltrack_legacy_disable)
1120 return NULL;
1121
1122 /* +1 is for '/' between "topdir" and "recdir" */
1123 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1124 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1125
1126 result = kmalloc(len, GFP_KERNEL);
1127 if (!result)
1128 return result;
1129
1130 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1131 nfs4_recoverydir());
1132 if (copied > (len - HEXDIR_LEN)) {
1133 /* just return nothing if output will be truncated */
1134 kfree(result);
1135 return NULL;
1136 }
1137
1138 copied = nfs4_make_rec_clidname(result + copied, name);
1139 if (copied) {
1140 kfree(result);
1141 return NULL;
1142 }
1143
1144 return result;
1145}
1146
1147static char *
1148nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
1149{
1150 int copied;
1151 size_t len;
1152 char *result;
1153
1154 /* prefix + Y/N character + terminating NULL */
1155 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1156
1157 result = kmalloc(len, GFP_KERNEL);
1158 if (!result)
1159 return result;
1160
1161 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1162 clp->cl_minorversion ? 'Y' : 'N');
1163 if (copied >= len) {
1164 /* just return nothing if output was truncated */
1165 kfree(result);
1166 return NULL;
1167 }
1168
1169 return result;
1170}
1171
1172static char *
1173nfsd4_cltrack_grace_start(time_t grace_start)
1174{
1175 int copied;
1176 size_t len;
1177 char *result;
1178
1179 /* prefix + max width of int64_t string + terminating NULL */
1180 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1181
1182 result = kmalloc(len, GFP_KERNEL);
1183 if (!result)
1184 return result;
1185
1186 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld",
1187 grace_start);
1188 if (copied >= len) {
1189 /* just return nothing if output was truncated */
1190 kfree(result);
1191 return NULL;
1192 }
1193
1194 return result;
1195}
1196
1197static int
1198nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1199{
1200 char *envp[3];
1201 char *argv[4];
1202 int ret;
1203
1204 if (unlikely(!cltrack_prog[0])) {
1205 dprintk("%s: cltrack_prog is disabled\n", __func__);
1206 return -EACCES;
1207 }
1208
1209 dprintk("%s: cmd: %s\n", __func__, cmd);
1210 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1211 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1212 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
1213
1214 envp[0] = env0;
1215 envp[1] = env1;
1216 envp[2] = NULL;
1217
1218 argv[0] = (char *)cltrack_prog;
1219 argv[1] = cmd;
1220 argv[2] = arg;
1221 argv[3] = NULL;
1222
1223 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1224 /*
1225 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1226 * error. The admin can re-enable it on the fly by using sysfs
1227 * once the problem has been fixed.
1228 */
1229 if (ret == -ENOENT || ret == -EACCES) {
1230 dprintk("NFSD: %s was not found or isn't executable (%d). "
1231 "Setting cltrack_prog to blank string!",
1232 cltrack_prog, ret);
1233 cltrack_prog[0] = '\0';
1234 }
1235 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1236
1237 return ret;
1238}
1239
1240static char *
1241bin_to_hex_dup(const unsigned char *src, int srclen)
1242{
1243 int i;
1244 char *buf, *hex;
1245
1246 /* +1 for terminating NULL */
1247 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1248 if (!buf)
1249 return buf;
1250
1251 hex = buf;
1252 for (i = 0; i < srclen; i++) {
1253 sprintf(hex, "%2.2x", *src++);
1254 hex += 2;
1255 }
1256 return buf;
1257}
1258
1259static int
1260nfsd4_umh_cltrack_init(struct net *net)
1261{
1262 int ret;
1263 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1264 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1265
1266 /* XXX: The usermode helper s not working in container yet. */
1267 if (net != &init_net) {
1268 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n");
1269 kfree(grace_start);
1270 return -EINVAL;
1271 }
1272
1273 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1274 kfree(grace_start);
1275 return ret;
1276}
1277
1278static void
1279nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1280{
1281 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1282 TASK_UNINTERRUPTIBLE);
1283}
1284
1285static void
1286nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1287{
1288 smp_mb__before_atomic();
1289 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1290 smp_mb__after_atomic();
1291 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
1292}
1293
1294static void
1295nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1296{
1297 char *hexid, *has_session, *grace_start;
1298 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1299
1300 /*
1301 * With v4.0 clients, there's little difference in outcome between a
1302 * create and check operation, and we can end up calling into this
1303 * function multiple times per client (once for each openowner). So,
1304 * for v4.0 clients skip upcalling once the client has been recorded
1305 * on stable storage.
1306 *
1307 * For v4.1+ clients, the outcome of the two operations is different,
1308 * so we must ensure that we upcall for the create operation. v4.1+
1309 * clients call this on RECLAIM_COMPLETE though, so we should only end
1310 * up doing a single create upcall per client.
1311 */
1312 if (clp->cl_minorversion == 0 &&
1313 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1314 return;
1315
1316 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1317 if (!hexid) {
1318 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1319 return;
1320 }
1321
1322 has_session = nfsd4_cltrack_client_has_session(clp);
1323 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1324
1325 nfsd4_cltrack_upcall_lock(clp);
1326 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1327 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1328 nfsd4_cltrack_upcall_unlock(clp);
1329
1330 kfree(has_session);
1331 kfree(grace_start);
1332 kfree(hexid);
1333}
1334
1335static void
1336nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1337{
1338 char *hexid;
1339
1340 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1341 return;
1342
1343 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1344 if (!hexid) {
1345 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1346 return;
1347 }
1348
1349 nfsd4_cltrack_upcall_lock(clp);
1350 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1351 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1352 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1353 nfsd4_cltrack_upcall_unlock(clp);
1354
1355 kfree(hexid);
1356}
1357
1358static int
1359nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1360{
1361 int ret;
1362 char *hexid, *has_session, *legacy;
1363
1364 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1365 return 0;
1366
1367 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1368 if (!hexid) {
1369 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1370 return -ENOMEM;
1371 }
1372
1373 has_session = nfsd4_cltrack_client_has_session(clp);
1374 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1375
1376 nfsd4_cltrack_upcall_lock(clp);
1377 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1378 ret = 0;
1379 } else {
1380 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1381 if (ret == 0)
1382 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1383 }
1384 nfsd4_cltrack_upcall_unlock(clp);
1385 kfree(has_session);
1386 kfree(legacy);
1387 kfree(hexid);
1388
1389 return ret;
1390}
1391
1392static void
1393nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
1394{
1395 char *legacy;
1396 char timestr[22]; /* FIXME: better way to determine max size? */
1397
1398 sprintf(timestr, "%ld", nn->boot_time);
1399 legacy = nfsd4_cltrack_legacy_topdir();
1400 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
1401 kfree(legacy);
1402}
1403
1404static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1405 .init = nfsd4_umh_cltrack_init,
1406 .exit = NULL,
1407 .create = nfsd4_umh_cltrack_create,
1408 .remove = nfsd4_umh_cltrack_remove,
1409 .check = nfsd4_umh_cltrack_check,
1410 .grace_done = nfsd4_umh_cltrack_grace_done,
1411};
1412
1413int
1414nfsd4_client_tracking_init(struct net *net)
1415{
1416 int status;
1417 struct path path;
1418 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1419
1420 /* just run the init if it the method is already decided */
1421 if (nn->client_tracking_ops)
1422 goto do_init;
1423
1424 /*
1425 * First, try a UMH upcall. It should succeed or fail quickly, so
1426 * there's little harm in trying that first.
1427 */
1428 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
1429 status = nn->client_tracking_ops->init(net);
1430 if (!status)
1431 return status;
1432
1433 /*
1434 * See if the recoverydir exists and is a directory. If it is,
1435 * then use the legacy ops.
1436 */
1437 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
1438 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1439 if (!status) {
1440 status = d_is_dir(path.dentry);
1441 path_put(&path);
1442 if (status)
1443 goto do_init;
1444 }
1445
1446 /* Finally, try to use nfsdcld */
1447 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1448 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1449 "removed in 3.10. Please transition to using "
1450 "nfsdcltrack.\n");
1451do_init:
1452 status = nn->client_tracking_ops->init(net);
1453 if (status) {
1454 printk(KERN_WARNING "NFSD: Unable to initialize client "
1455 "recovery tracking! (%d)\n", status);
1456 nn->client_tracking_ops = NULL;
1457 }
1458 return status;
1459}
1460
1461void
1462nfsd4_client_tracking_exit(struct net *net)
1463{
1464 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1465
1466 if (nn->client_tracking_ops) {
1467 if (nn->client_tracking_ops->exit)
1468 nn->client_tracking_ops->exit(net);
1469 nn->client_tracking_ops = NULL;
1470 }
1471}
1472
1473void
1474nfsd4_client_record_create(struct nfs4_client *clp)
1475{
1476 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1477
1478 if (nn->client_tracking_ops)
1479 nn->client_tracking_ops->create(clp);
1480}
1481
1482void
1483nfsd4_client_record_remove(struct nfs4_client *clp)
1484{
1485 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1486
1487 if (nn->client_tracking_ops)
1488 nn->client_tracking_ops->remove(clp);
1489}
1490
1491int
1492nfsd4_client_record_check(struct nfs4_client *clp)
1493{
1494 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1495
1496 if (nn->client_tracking_ops)
1497 return nn->client_tracking_ops->check(clp);
1498
1499 return -EOPNOTSUPP;
1500}
1501
1502void
1503nfsd4_record_grace_done(struct nfsd_net *nn)
1504{
1505 if (nn->client_tracking_ops)
1506 nn->client_tracking_ops->grace_done(nn);
1507}
1508
1509static int
1510rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1511{
1512 struct super_block *sb = ptr;
1513 struct net *net = sb->s_fs_info;
1514 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1515 struct cld_net *cn = nn->cld_net;
1516 struct dentry *dentry;
1517 int ret = 0;
1518
1519 if (!try_module_get(THIS_MODULE))
1520 return 0;
1521
1522 if (!cn) {
1523 module_put(THIS_MODULE);
1524 return 0;
1525 }
1526
1527 switch (event) {
1528 case RPC_PIPEFS_MOUNT:
1529 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1530 if (IS_ERR(dentry)) {
1531 ret = PTR_ERR(dentry);
1532 break;
1533 }
1534 cn->cn_pipe->dentry = dentry;
1535 break;
1536 case RPC_PIPEFS_UMOUNT:
1537 if (cn->cn_pipe->dentry)
1538 nfsd4_cld_unregister_sb(cn->cn_pipe);
1539 break;
1540 default:
1541 ret = -ENOTSUPP;
1542 break;
1543 }
1544 module_put(THIS_MODULE);
1545 return ret;
1546}
1547
1548static struct notifier_block nfsd4_cld_block = {
1549 .notifier_call = rpc_pipefs_event,
1550};
1551
1552int
1553register_cld_notifier(void)
1554{
1555 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1556}
1557
1558void
1559unregister_cld_notifier(void)
1560{
1561 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
1562}