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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#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
70/* Globals */
71static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
72
73static int
74nfs4_save_creds(const struct cred **original_creds)
75{
76 struct cred *new;
77
78 new = prepare_creds();
79 if (!new)
80 return -ENOMEM;
81
82 new->fsuid = GLOBAL_ROOT_UID;
83 new->fsgid = GLOBAL_ROOT_GID;
84 *original_creds = override_creds(new);
85 put_cred(new);
86 return 0;
87}
88
89static void
90nfs4_reset_creds(const struct cred *original)
91{
92 revert_creds(original);
93}
94
95static void
96md5_to_hex(char *out, char *md5)
97{
98 int i;
99
100 for (i=0; i<16; i++) {
101 unsigned char c = md5[i];
102
103 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
104 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
105 }
106 *out = '\0';
107}
108
109static int
110nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
111{
112 struct xdr_netobj cksum;
113 struct crypto_shash *tfm;
114 int status;
115
116 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
117 clname->len, clname->data);
118 tfm = crypto_alloc_shash("md5", 0, 0);
119 if (IS_ERR(tfm)) {
120 status = PTR_ERR(tfm);
121 goto out_no_tfm;
122 }
123
124 cksum.len = crypto_shash_digestsize(tfm);
125 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
126 if (cksum.data == NULL) {
127 status = -ENOMEM;
128 goto out;
129 }
130
131 status = crypto_shash_tfm_digest(tfm, clname->data, clname->len,
132 cksum.data);
133 if (status)
134 goto out;
135
136 md5_to_hex(dname, cksum.data);
137
138 status = 0;
139out:
140 kfree(cksum.data);
141 crypto_free_shash(tfm);
142out_no_tfm:
143 return status;
144}
145
146/*
147 * If we had an error generating the recdir name for the legacy tracker
148 * then warn the admin. If the error doesn't appear to be transient,
149 * then disable recovery tracking.
150 */
151static void
152legacy_recdir_name_error(struct nfs4_client *clp, int error)
153{
154 printk(KERN_ERR "NFSD: unable to generate recoverydir "
155 "name (%d).\n", error);
156
157 /*
158 * if the algorithm just doesn't exist, then disable the recovery
159 * tracker altogether. The crypto libs will generally return this if
160 * FIPS is enabled as well.
161 */
162 if (error == -ENOENT) {
163 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
164 "Reboot recovery will not function correctly!\n");
165 nfsd4_client_tracking_exit(clp->net);
166 }
167}
168
169static void
170__nfsd4_create_reclaim_record_grace(struct nfs4_client *clp,
171 const char *dname, int len, struct nfsd_net *nn)
172{
173 struct xdr_netobj name;
174 struct xdr_netobj princhash = { .len = 0, .data = NULL };
175 struct nfs4_client_reclaim *crp;
176
177 name.data = kmemdup(dname, len, GFP_KERNEL);
178 if (!name.data) {
179 dprintk("%s: failed to allocate memory for name.data!\n",
180 __func__);
181 return;
182 }
183 name.len = len;
184 crp = nfs4_client_to_reclaim(name, princhash, nn);
185 if (!crp) {
186 kfree(name.data);
187 return;
188 }
189 crp->cr_clp = clp;
190}
191
192static void
193nfsd4_create_clid_dir(struct nfs4_client *clp)
194{
195 const struct cred *original_cred;
196 char dname[HEXDIR_LEN];
197 struct dentry *dir, *dentry;
198 int status;
199 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
200
201 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
202 return;
203 if (!nn->rec_file)
204 return;
205
206 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
207 if (status)
208 return legacy_recdir_name_error(clp, status);
209
210 status = nfs4_save_creds(&original_cred);
211 if (status < 0)
212 return;
213
214 status = mnt_want_write_file(nn->rec_file);
215 if (status)
216 goto out_creds;
217
218 dir = nn->rec_file->f_path.dentry;
219 /* lock the parent */
220 inode_lock(d_inode(dir));
221
222 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
223 if (IS_ERR(dentry)) {
224 status = PTR_ERR(dentry);
225 goto out_unlock;
226 }
227 if (d_really_is_positive(dentry))
228 /*
229 * In the 4.1 case, where we're called from
230 * reclaim_complete(), records from the previous reboot
231 * may still be left, so this is OK.
232 *
233 * In the 4.0 case, we should never get here; but we may
234 * as well be forgiving and just succeed silently.
235 */
236 goto out_put;
237 status = vfs_mkdir(&nop_mnt_idmap, d_inode(dir), dentry, S_IRWXU);
238out_put:
239 dput(dentry);
240out_unlock:
241 inode_unlock(d_inode(dir));
242 if (status == 0) {
243 if (nn->in_grace)
244 __nfsd4_create_reclaim_record_grace(clp, dname,
245 HEXDIR_LEN, nn);
246 vfs_fsync(nn->rec_file, 0);
247 } else {
248 printk(KERN_ERR "NFSD: failed to write recovery record"
249 " (err %d); please check that %s exists"
250 " and is writeable", status,
251 user_recovery_dirname);
252 }
253 mnt_drop_write_file(nn->rec_file);
254out_creds:
255 nfs4_reset_creds(original_cred);
256}
257
258typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
259
260struct name_list {
261 char name[HEXDIR_LEN];
262 struct list_head list;
263};
264
265struct nfs4_dir_ctx {
266 struct dir_context ctx;
267 struct list_head names;
268};
269
270static bool
271nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
272 loff_t offset, u64 ino, unsigned int d_type)
273{
274 struct nfs4_dir_ctx *ctx =
275 container_of(__ctx, struct nfs4_dir_ctx, ctx);
276 struct name_list *entry;
277
278 if (namlen != HEXDIR_LEN - 1)
279 return true;
280 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
281 if (entry == NULL)
282 return false;
283 memcpy(entry->name, name, HEXDIR_LEN - 1);
284 entry->name[HEXDIR_LEN - 1] = '\0';
285 list_add(&entry->list, &ctx->names);
286 return true;
287}
288
289static int
290nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
291{
292 const struct cred *original_cred;
293 struct dentry *dir = nn->rec_file->f_path.dentry;
294 struct nfs4_dir_ctx ctx = {
295 .ctx.actor = nfsd4_build_namelist,
296 .names = LIST_HEAD_INIT(ctx.names)
297 };
298 struct name_list *entry, *tmp;
299 int status;
300
301 status = nfs4_save_creds(&original_cred);
302 if (status < 0)
303 return status;
304
305 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
306 if (status < 0) {
307 nfs4_reset_creds(original_cred);
308 return status;
309 }
310
311 status = iterate_dir(nn->rec_file, &ctx.ctx);
312 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
313
314 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
315 if (!status) {
316 struct dentry *dentry;
317 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
318 if (IS_ERR(dentry)) {
319 status = PTR_ERR(dentry);
320 break;
321 }
322 status = f(dir, dentry, nn);
323 dput(dentry);
324 }
325 list_del(&entry->list);
326 kfree(entry);
327 }
328 inode_unlock(d_inode(dir));
329 nfs4_reset_creds(original_cred);
330
331 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
332 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name);
333 list_del(&entry->list);
334 kfree(entry);
335 }
336 return status;
337}
338
339static int
340nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
341{
342 struct dentry *dir, *dentry;
343 int status;
344
345 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
346
347 dir = nn->rec_file->f_path.dentry;
348 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
349 dentry = lookup_one_len(name, dir, namlen);
350 if (IS_ERR(dentry)) {
351 status = PTR_ERR(dentry);
352 goto out_unlock;
353 }
354 status = -ENOENT;
355 if (d_really_is_negative(dentry))
356 goto out;
357 status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry);
358out:
359 dput(dentry);
360out_unlock:
361 inode_unlock(d_inode(dir));
362 return status;
363}
364
365static void
366__nfsd4_remove_reclaim_record_grace(const char *dname, int len,
367 struct nfsd_net *nn)
368{
369 struct xdr_netobj name;
370 struct nfs4_client_reclaim *crp;
371
372 name.data = kmemdup(dname, len, GFP_KERNEL);
373 if (!name.data) {
374 dprintk("%s: failed to allocate memory for name.data!\n",
375 __func__);
376 return;
377 }
378 name.len = len;
379 crp = nfsd4_find_reclaim_client(name, nn);
380 kfree(name.data);
381 if (crp)
382 nfs4_remove_reclaim_record(crp, nn);
383}
384
385static void
386nfsd4_remove_clid_dir(struct nfs4_client *clp)
387{
388 const struct cred *original_cred;
389 char dname[HEXDIR_LEN];
390 int status;
391 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
392
393 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
394 return;
395
396 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
397 if (status)
398 return legacy_recdir_name_error(clp, status);
399
400 status = mnt_want_write_file(nn->rec_file);
401 if (status)
402 goto out;
403 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
404
405 status = nfs4_save_creds(&original_cred);
406 if (status < 0)
407 goto out_drop_write;
408
409 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
410 nfs4_reset_creds(original_cred);
411 if (status == 0) {
412 vfs_fsync(nn->rec_file, 0);
413 if (nn->in_grace)
414 __nfsd4_remove_reclaim_record_grace(dname,
415 HEXDIR_LEN, nn);
416 }
417out_drop_write:
418 mnt_drop_write_file(nn->rec_file);
419out:
420 if (status)
421 printk("NFSD: Failed to remove expired client state directory"
422 " %.*s\n", HEXDIR_LEN, dname);
423}
424
425static int
426purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
427{
428 int status;
429 struct xdr_netobj name;
430
431 if (child->d_name.len != HEXDIR_LEN - 1) {
432 printk("%s: illegal name %pd in recovery directory\n",
433 __func__, child);
434 /* Keep trying; maybe the others are OK: */
435 return 0;
436 }
437 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
438 if (!name.data) {
439 dprintk("%s: failed to allocate memory for name.data!\n",
440 __func__);
441 goto out;
442 }
443 name.len = HEXDIR_LEN;
444 if (nfs4_has_reclaimed_state(name, nn))
445 goto out_free;
446
447 status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child);
448 if (status)
449 printk("failed to remove client recovery directory %pd\n",
450 child);
451out_free:
452 kfree(name.data);
453out:
454 /* Keep trying, success or failure: */
455 return 0;
456}
457
458static void
459nfsd4_recdir_purge_old(struct nfsd_net *nn)
460{
461 int status;
462
463 nn->in_grace = false;
464 if (!nn->rec_file)
465 return;
466 status = mnt_want_write_file(nn->rec_file);
467 if (status)
468 goto out;
469 status = nfsd4_list_rec_dir(purge_old, nn);
470 if (status == 0)
471 vfs_fsync(nn->rec_file, 0);
472 mnt_drop_write_file(nn->rec_file);
473out:
474 nfs4_release_reclaim(nn);
475 if (status)
476 printk("nfsd4: failed to purge old clients from recovery"
477 " directory %pD\n", nn->rec_file);
478}
479
480static int
481load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
482{
483 struct xdr_netobj name;
484 struct xdr_netobj princhash = { .len = 0, .data = NULL };
485
486 if (child->d_name.len != HEXDIR_LEN - 1) {
487 printk("%s: illegal name %pd in recovery directory\n",
488 __func__, child);
489 /* Keep trying; maybe the others are OK: */
490 return 0;
491 }
492 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
493 if (!name.data) {
494 dprintk("%s: failed to allocate memory for name.data!\n",
495 __func__);
496 goto out;
497 }
498 name.len = HEXDIR_LEN;
499 if (!nfs4_client_to_reclaim(name, princhash, nn))
500 kfree(name.data);
501out:
502 return 0;
503}
504
505static int
506nfsd4_recdir_load(struct net *net) {
507 int status;
508 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
509
510 if (!nn->rec_file)
511 return 0;
512
513 status = nfsd4_list_rec_dir(load_recdir, nn);
514 if (status)
515 printk("nfsd4: failed loading clients from recovery"
516 " directory %pD\n", nn->rec_file);
517 return status;
518}
519
520/*
521 * Hold reference to the recovery directory.
522 */
523
524static int
525nfsd4_init_recdir(struct net *net)
526{
527 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
528 const struct cred *original_cred;
529 int status;
530
531 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
532 user_recovery_dirname);
533
534 BUG_ON(nn->rec_file);
535
536 status = nfs4_save_creds(&original_cred);
537 if (status < 0) {
538 printk("NFSD: Unable to change credentials to find recovery"
539 " directory: error %d\n",
540 status);
541 return status;
542 }
543
544 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
545 if (IS_ERR(nn->rec_file)) {
546 printk("NFSD: unable to find recovery directory %s\n",
547 user_recovery_dirname);
548 status = PTR_ERR(nn->rec_file);
549 nn->rec_file = NULL;
550 }
551
552 nfs4_reset_creds(original_cred);
553 if (!status)
554 nn->in_grace = true;
555 return status;
556}
557
558static void
559nfsd4_shutdown_recdir(struct net *net)
560{
561 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
562
563 if (!nn->rec_file)
564 return;
565 fput(nn->rec_file);
566 nn->rec_file = NULL;
567}
568
569static int
570nfs4_legacy_state_init(struct net *net)
571{
572 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
573 int i;
574
575 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
576 sizeof(struct list_head),
577 GFP_KERNEL);
578 if (!nn->reclaim_str_hashtbl)
579 return -ENOMEM;
580
581 for (i = 0; i < CLIENT_HASH_SIZE; i++)
582 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
583 nn->reclaim_str_hashtbl_size = 0;
584
585 return 0;
586}
587
588static void
589nfs4_legacy_state_shutdown(struct net *net)
590{
591 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
592
593 kfree(nn->reclaim_str_hashtbl);
594}
595
596static int
597nfsd4_load_reboot_recovery_data(struct net *net)
598{
599 int status;
600
601 status = nfsd4_init_recdir(net);
602 if (status)
603 return status;
604
605 status = nfsd4_recdir_load(net);
606 if (status)
607 nfsd4_shutdown_recdir(net);
608
609 return status;
610}
611
612static int
613nfsd4_legacy_tracking_init(struct net *net)
614{
615 int status;
616
617 /* XXX: The legacy code won't work in a container */
618 if (net != &init_net) {
619 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n");
620 return -EINVAL;
621 }
622
623 status = nfs4_legacy_state_init(net);
624 if (status)
625 return status;
626
627 status = nfsd4_load_reboot_recovery_data(net);
628 if (status)
629 goto err;
630 pr_info("NFSD: Using legacy client tracking operations.\n");
631 return 0;
632
633err:
634 nfs4_legacy_state_shutdown(net);
635 return status;
636}
637
638static void
639nfsd4_legacy_tracking_exit(struct net *net)
640{
641 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
642
643 nfs4_release_reclaim(nn);
644 nfsd4_shutdown_recdir(net);
645 nfs4_legacy_state_shutdown(net);
646}
647
648/*
649 * Change the NFSv4 recovery directory to recdir.
650 */
651int
652nfs4_reset_recoverydir(char *recdir)
653{
654 int status;
655 struct path path;
656
657 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
658 if (status)
659 return status;
660 status = -ENOTDIR;
661 if (d_is_dir(path.dentry)) {
662 strscpy(user_recovery_dirname, recdir,
663 sizeof(user_recovery_dirname));
664 status = 0;
665 }
666 path_put(&path);
667 return status;
668}
669
670char *
671nfs4_recoverydir(void)
672{
673 return user_recovery_dirname;
674}
675
676static int
677nfsd4_check_legacy_client(struct nfs4_client *clp)
678{
679 int status;
680 char dname[HEXDIR_LEN];
681 struct nfs4_client_reclaim *crp;
682 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
683 struct xdr_netobj name;
684
685 /* did we already find that this client is stable? */
686 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
687 return 0;
688
689 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
690 if (status) {
691 legacy_recdir_name_error(clp, status);
692 return status;
693 }
694
695 /* look for it in the reclaim hashtable otherwise */
696 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
697 if (!name.data) {
698 dprintk("%s: failed to allocate memory for name.data!\n",
699 __func__);
700 goto out_enoent;
701 }
702 name.len = HEXDIR_LEN;
703 crp = nfsd4_find_reclaim_client(name, nn);
704 kfree(name.data);
705 if (crp) {
706 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
707 crp->cr_clp = clp;
708 return 0;
709 }
710
711out_enoent:
712 return -ENOENT;
713}
714
715static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
716 .init = nfsd4_legacy_tracking_init,
717 .exit = nfsd4_legacy_tracking_exit,
718 .create = nfsd4_create_clid_dir,
719 .remove = nfsd4_remove_clid_dir,
720 .check = nfsd4_check_legacy_client,
721 .grace_done = nfsd4_recdir_purge_old,
722 .version = 1,
723 .msglen = 0,
724};
725#endif /* CONFIG_NFSD_LEGACY_CLIENT_TRACKING */
726
727/* Globals */
728#define NFSD_PIPE_DIR "nfsd"
729#define NFSD_CLD_PIPE "cld"
730
731/* per-net-ns structure for holding cld upcall info */
732struct cld_net {
733 struct rpc_pipe *cn_pipe;
734 spinlock_t cn_lock;
735 struct list_head cn_list;
736 unsigned int cn_xid;
737 struct crypto_shash *cn_tfm;
738#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
739 bool cn_has_legacy;
740#endif
741};
742
743struct cld_upcall {
744 struct list_head cu_list;
745 struct cld_net *cu_net;
746 struct completion cu_done;
747 union {
748 struct cld_msg_hdr cu_hdr;
749 struct cld_msg cu_msg;
750 struct cld_msg_v2 cu_msg_v2;
751 } cu_u;
752};
753
754static int
755__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn)
756{
757 int ret;
758 struct rpc_pipe_msg msg;
759 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u);
760
761 memset(&msg, 0, sizeof(msg));
762 msg.data = cmsg;
763 msg.len = nn->client_tracking_ops->msglen;
764
765 ret = rpc_queue_upcall(pipe, &msg);
766 if (ret < 0) {
767 goto out;
768 }
769
770 wait_for_completion(&cup->cu_done);
771
772 if (msg.errno < 0)
773 ret = msg.errno;
774out:
775 return ret;
776}
777
778static int
779cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn)
780{
781 int ret;
782
783 /*
784 * -EAGAIN occurs when pipe is closed and reopened while there are
785 * upcalls queued.
786 */
787 do {
788 ret = __cld_pipe_upcall(pipe, cmsg, nn);
789 } while (ret == -EAGAIN);
790
791 return ret;
792}
793
794static ssize_t
795__cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
796 struct nfsd_net *nn)
797{
798 uint8_t cmd, princhashlen;
799 struct xdr_netobj name, princhash = { .len = 0, .data = NULL };
800 uint16_t namelen;
801
802 if (get_user(cmd, &cmsg->cm_cmd)) {
803 dprintk("%s: error when copying cmd from userspace", __func__);
804 return -EFAULT;
805 }
806 if (cmd == Cld_GraceStart) {
807 if (nn->client_tracking_ops->version >= 2) {
808 const struct cld_clntinfo __user *ci;
809
810 ci = &cmsg->cm_u.cm_clntinfo;
811 if (get_user(namelen, &ci->cc_name.cn_len))
812 return -EFAULT;
813 if (namelen == 0 || namelen > NFS4_OPAQUE_LIMIT) {
814 dprintk("%s: invalid namelen (%u)", __func__, namelen);
815 return -EINVAL;
816 }
817 name.data = memdup_user(&ci->cc_name.cn_id, namelen);
818 if (IS_ERR(name.data))
819 return PTR_ERR(name.data);
820 name.len = namelen;
821 get_user(princhashlen, &ci->cc_princhash.cp_len);
822 if (princhashlen > 0) {
823 princhash.data = memdup_user(
824 &ci->cc_princhash.cp_data,
825 princhashlen);
826 if (IS_ERR(princhash.data)) {
827 kfree(name.data);
828 return PTR_ERR(princhash.data);
829 }
830 princhash.len = princhashlen;
831 } else
832 princhash.len = 0;
833 } else {
834 const struct cld_name __user *cnm;
835
836 cnm = &cmsg->cm_u.cm_name;
837 if (get_user(namelen, &cnm->cn_len))
838 return -EFAULT;
839 if (namelen == 0 || namelen > NFS4_OPAQUE_LIMIT) {
840 dprintk("%s: invalid namelen (%u)", __func__, namelen);
841 return -EINVAL;
842 }
843 name.data = memdup_user(&cnm->cn_id, namelen);
844 if (IS_ERR(name.data))
845 return PTR_ERR(name.data);
846 name.len = namelen;
847 }
848#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
849 if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) {
850 struct cld_net *cn = nn->cld_net;
851
852 name.len = name.len - 5;
853 memmove(name.data, name.data + 5, name.len);
854 cn->cn_has_legacy = true;
855 }
856#endif
857 if (!nfs4_client_to_reclaim(name, princhash, nn)) {
858 kfree(name.data);
859 kfree(princhash.data);
860 return -EFAULT;
861 }
862 return nn->client_tracking_ops->msglen;
863 }
864 return -EFAULT;
865}
866
867static ssize_t
868cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
869{
870 struct cld_upcall *tmp, *cup;
871 struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src;
872 struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src;
873 uint32_t xid;
874 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
875 nfsd_net_id);
876 struct cld_net *cn = nn->cld_net;
877 int16_t status;
878
879 if (mlen != nn->client_tracking_ops->msglen) {
880 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
881 nn->client_tracking_ops->msglen);
882 return -EINVAL;
883 }
884
885 /* copy just the xid so we can try to find that */
886 if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) {
887 dprintk("%s: error when copying xid from userspace", __func__);
888 return -EFAULT;
889 }
890
891 /*
892 * copy the status so we know whether to remove the upcall from the
893 * list (for -EINPROGRESS, we just want to make sure the xid is
894 * valid, not remove the upcall from the list)
895 */
896 if (get_user(status, &hdr->cm_status)) {
897 dprintk("%s: error when copying status from userspace", __func__);
898 return -EFAULT;
899 }
900
901 /* walk the list and find corresponding xid */
902 cup = NULL;
903 spin_lock(&cn->cn_lock);
904 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
905 if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) {
906 cup = tmp;
907 if (status != -EINPROGRESS)
908 list_del_init(&cup->cu_list);
909 break;
910 }
911 }
912 spin_unlock(&cn->cn_lock);
913
914 /* couldn't find upcall? */
915 if (!cup) {
916 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
917 return -EINVAL;
918 }
919
920 if (status == -EINPROGRESS)
921 return __cld_pipe_inprogress_downcall(cmsg, nn);
922
923 if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0)
924 return -EFAULT;
925
926 complete(&cup->cu_done);
927 return mlen;
928}
929
930static void
931cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
932{
933 struct cld_msg *cmsg = msg->data;
934 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
935 cu_u.cu_msg);
936
937 /* errno >= 0 means we got a downcall */
938 if (msg->errno >= 0)
939 return;
940
941 complete(&cup->cu_done);
942}
943
944static const struct rpc_pipe_ops cld_upcall_ops = {
945 .upcall = rpc_pipe_generic_upcall,
946 .downcall = cld_pipe_downcall,
947 .destroy_msg = cld_pipe_destroy_msg,
948};
949
950static struct dentry *
951nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
952{
953 struct dentry *dir, *dentry;
954
955 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
956 if (dir == NULL)
957 return ERR_PTR(-ENOENT);
958 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
959 dput(dir);
960 return dentry;
961}
962
963static void
964nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
965{
966 if (pipe->dentry)
967 rpc_unlink(pipe->dentry);
968}
969
970static struct dentry *
971nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
972{
973 struct super_block *sb;
974 struct dentry *dentry;
975
976 sb = rpc_get_sb_net(net);
977 if (!sb)
978 return NULL;
979 dentry = nfsd4_cld_register_sb(sb, pipe);
980 rpc_put_sb_net(net);
981 return dentry;
982}
983
984static void
985nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
986{
987 struct super_block *sb;
988
989 sb = rpc_get_sb_net(net);
990 if (sb) {
991 nfsd4_cld_unregister_sb(pipe);
992 rpc_put_sb_net(net);
993 }
994}
995
996/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
997static int
998__nfsd4_init_cld_pipe(struct net *net)
999{
1000 int ret;
1001 struct dentry *dentry;
1002 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1003 struct cld_net *cn;
1004
1005 if (nn->cld_net)
1006 return 0;
1007
1008 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
1009 if (!cn) {
1010 ret = -ENOMEM;
1011 goto err;
1012 }
1013
1014 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
1015 if (IS_ERR(cn->cn_pipe)) {
1016 ret = PTR_ERR(cn->cn_pipe);
1017 goto err;
1018 }
1019 spin_lock_init(&cn->cn_lock);
1020 INIT_LIST_HEAD(&cn->cn_list);
1021
1022 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
1023 if (IS_ERR(dentry)) {
1024 ret = PTR_ERR(dentry);
1025 goto err_destroy_data;
1026 }
1027
1028 cn->cn_pipe->dentry = dentry;
1029#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1030 cn->cn_has_legacy = false;
1031#endif
1032 nn->cld_net = cn;
1033 return 0;
1034
1035err_destroy_data:
1036 rpc_destroy_pipe_data(cn->cn_pipe);
1037err:
1038 kfree(cn);
1039 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
1040 ret);
1041 return ret;
1042}
1043
1044static int
1045nfsd4_init_cld_pipe(struct net *net)
1046{
1047 int status;
1048
1049 status = __nfsd4_init_cld_pipe(net);
1050 if (!status)
1051 pr_info("NFSD: Using old nfsdcld client tracking operations.\n");
1052 return status;
1053}
1054
1055static void
1056nfsd4_remove_cld_pipe(struct net *net)
1057{
1058 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1059 struct cld_net *cn = nn->cld_net;
1060
1061 nfsd4_cld_unregister_net(net, cn->cn_pipe);
1062 rpc_destroy_pipe_data(cn->cn_pipe);
1063 if (cn->cn_tfm)
1064 crypto_free_shash(cn->cn_tfm);
1065 kfree(nn->cld_net);
1066 nn->cld_net = NULL;
1067}
1068
1069static struct cld_upcall *
1070alloc_cld_upcall(struct nfsd_net *nn)
1071{
1072 struct cld_upcall *new, *tmp;
1073 struct cld_net *cn = nn->cld_net;
1074
1075 new = kzalloc(sizeof(*new), GFP_KERNEL);
1076 if (!new)
1077 return new;
1078
1079 /* FIXME: hard cap on number in flight? */
1080restart_search:
1081 spin_lock(&cn->cn_lock);
1082 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
1083 if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) {
1084 cn->cn_xid++;
1085 spin_unlock(&cn->cn_lock);
1086 goto restart_search;
1087 }
1088 }
1089 init_completion(&new->cu_done);
1090 new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version;
1091 put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid);
1092 new->cu_net = cn;
1093 list_add(&new->cu_list, &cn->cn_list);
1094 spin_unlock(&cn->cn_lock);
1095
1096 dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid);
1097
1098 return new;
1099}
1100
1101static void
1102free_cld_upcall(struct cld_upcall *victim)
1103{
1104 struct cld_net *cn = victim->cu_net;
1105
1106 spin_lock(&cn->cn_lock);
1107 list_del(&victim->cu_list);
1108 spin_unlock(&cn->cn_lock);
1109 kfree(victim);
1110}
1111
1112/* Ask daemon to create a new record */
1113static void
1114nfsd4_cld_create(struct nfs4_client *clp)
1115{
1116 int ret;
1117 struct cld_upcall *cup;
1118 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1119 struct cld_net *cn = nn->cld_net;
1120
1121 /* Don't upcall if it's already stored */
1122 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1123 return;
1124
1125 cup = alloc_cld_upcall(nn);
1126 if (!cup) {
1127 ret = -ENOMEM;
1128 goto out_err;
1129 }
1130
1131 cup->cu_u.cu_msg.cm_cmd = Cld_Create;
1132 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1133 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1134 clp->cl_name.len);
1135
1136 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1137 if (!ret) {
1138 ret = cup->cu_u.cu_msg.cm_status;
1139 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1140 }
1141
1142 free_cld_upcall(cup);
1143out_err:
1144 if (ret)
1145 printk(KERN_ERR "NFSD: Unable to create client "
1146 "record on stable storage: %d\n", ret);
1147}
1148
1149/* Ask daemon to create a new record */
1150static void
1151nfsd4_cld_create_v2(struct nfs4_client *clp)
1152{
1153 int ret;
1154 struct cld_upcall *cup;
1155 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1156 struct cld_net *cn = nn->cld_net;
1157 struct cld_msg_v2 *cmsg;
1158 struct crypto_shash *tfm = cn->cn_tfm;
1159 struct xdr_netobj cksum;
1160 char *principal = NULL;
1161
1162 /* Don't upcall if it's already stored */
1163 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1164 return;
1165
1166 cup = alloc_cld_upcall(nn);
1167 if (!cup) {
1168 ret = -ENOMEM;
1169 goto out_err;
1170 }
1171
1172 cmsg = &cup->cu_u.cu_msg_v2;
1173 cmsg->cm_cmd = Cld_Create;
1174 cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len;
1175 memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data,
1176 clp->cl_name.len);
1177 if (clp->cl_cred.cr_raw_principal)
1178 principal = clp->cl_cred.cr_raw_principal;
1179 else if (clp->cl_cred.cr_principal)
1180 principal = clp->cl_cred.cr_principal;
1181 if (principal) {
1182 cksum.len = crypto_shash_digestsize(tfm);
1183 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1184 if (cksum.data == NULL) {
1185 ret = -ENOMEM;
1186 goto out;
1187 }
1188 ret = crypto_shash_tfm_digest(tfm, principal, strlen(principal),
1189 cksum.data);
1190 if (ret) {
1191 kfree(cksum.data);
1192 goto out;
1193 }
1194 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len;
1195 memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
1196 cksum.data, cksum.len);
1197 kfree(cksum.data);
1198 } else
1199 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0;
1200
1201 ret = cld_pipe_upcall(cn->cn_pipe, cmsg, nn);
1202 if (!ret) {
1203 ret = cmsg->cm_status;
1204 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1205 }
1206
1207out:
1208 free_cld_upcall(cup);
1209out_err:
1210 if (ret)
1211 pr_err("NFSD: Unable to create client record on stable storage: %d\n",
1212 ret);
1213}
1214
1215/* Ask daemon to create a new record */
1216static void
1217nfsd4_cld_remove(struct nfs4_client *clp)
1218{
1219 int ret;
1220 struct cld_upcall *cup;
1221 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1222 struct cld_net *cn = nn->cld_net;
1223
1224 /* Don't upcall if it's already removed */
1225 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1226 return;
1227
1228 cup = alloc_cld_upcall(nn);
1229 if (!cup) {
1230 ret = -ENOMEM;
1231 goto out_err;
1232 }
1233
1234 cup->cu_u.cu_msg.cm_cmd = Cld_Remove;
1235 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1236 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1237 clp->cl_name.len);
1238
1239 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1240 if (!ret) {
1241 ret = cup->cu_u.cu_msg.cm_status;
1242 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1243 }
1244
1245 free_cld_upcall(cup);
1246out_err:
1247 if (ret)
1248 printk(KERN_ERR "NFSD: Unable to remove client "
1249 "record from stable storage: %d\n", ret);
1250}
1251
1252/*
1253 * For older nfsdcld's that do not allow us to "slurp" the clients
1254 * from the tracking database during startup.
1255 *
1256 * Check for presence of a record, and update its timestamp
1257 */
1258static int
1259nfsd4_cld_check_v0(struct nfs4_client *clp)
1260{
1261 int ret;
1262 struct cld_upcall *cup;
1263 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1264 struct cld_net *cn = nn->cld_net;
1265
1266 /* Don't upcall if one was already stored during this grace pd */
1267 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1268 return 0;
1269
1270 cup = alloc_cld_upcall(nn);
1271 if (!cup) {
1272 printk(KERN_ERR "NFSD: Unable to check client record on "
1273 "stable storage: %d\n", -ENOMEM);
1274 return -ENOMEM;
1275 }
1276
1277 cup->cu_u.cu_msg.cm_cmd = Cld_Check;
1278 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1279 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1280 clp->cl_name.len);
1281
1282 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1283 if (!ret) {
1284 ret = cup->cu_u.cu_msg.cm_status;
1285 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1286 }
1287
1288 free_cld_upcall(cup);
1289 return ret;
1290}
1291
1292/*
1293 * For newer nfsdcld's that allow us to "slurp" the clients
1294 * from the tracking database during startup.
1295 *
1296 * Check for presence of a record in the reclaim_str_hashtbl
1297 */
1298static int
1299nfsd4_cld_check(struct nfs4_client *clp)
1300{
1301 struct nfs4_client_reclaim *crp;
1302 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1303
1304 /* did we already find that this client is stable? */
1305 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1306 return 0;
1307
1308 /* look for it in the reclaim hashtable otherwise */
1309 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1310 if (crp)
1311 goto found;
1312
1313#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1314 if (nn->cld_net->cn_has_legacy) {
1315 int status;
1316 char dname[HEXDIR_LEN];
1317 struct xdr_netobj name;
1318
1319 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1320 if (status)
1321 return -ENOENT;
1322
1323 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1324 if (!name.data) {
1325 dprintk("%s: failed to allocate memory for name.data!\n",
1326 __func__);
1327 return -ENOENT;
1328 }
1329 name.len = HEXDIR_LEN;
1330 crp = nfsd4_find_reclaim_client(name, nn);
1331 kfree(name.data);
1332 if (crp)
1333 goto found;
1334
1335 }
1336#endif
1337 return -ENOENT;
1338found:
1339 crp->cr_clp = clp;
1340 return 0;
1341}
1342
1343static int
1344nfsd4_cld_check_v2(struct nfs4_client *clp)
1345{
1346 struct nfs4_client_reclaim *crp;
1347 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1348 struct cld_net *cn = nn->cld_net;
1349 int status;
1350 struct crypto_shash *tfm = cn->cn_tfm;
1351 struct xdr_netobj cksum;
1352 char *principal = NULL;
1353
1354 /* did we already find that this client is stable? */
1355 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1356 return 0;
1357
1358 /* look for it in the reclaim hashtable otherwise */
1359 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1360 if (crp)
1361 goto found;
1362
1363#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1364 if (cn->cn_has_legacy) {
1365 struct xdr_netobj name;
1366 char dname[HEXDIR_LEN];
1367
1368 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1369 if (status)
1370 return -ENOENT;
1371
1372 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1373 if (!name.data) {
1374 dprintk("%s: failed to allocate memory for name.data\n",
1375 __func__);
1376 return -ENOENT;
1377 }
1378 name.len = HEXDIR_LEN;
1379 crp = nfsd4_find_reclaim_client(name, nn);
1380 kfree(name.data);
1381 if (crp)
1382 goto found;
1383
1384 }
1385#endif
1386 return -ENOENT;
1387found:
1388 if (crp->cr_princhash.len) {
1389 if (clp->cl_cred.cr_raw_principal)
1390 principal = clp->cl_cred.cr_raw_principal;
1391 else if (clp->cl_cred.cr_principal)
1392 principal = clp->cl_cred.cr_principal;
1393 if (principal == NULL)
1394 return -ENOENT;
1395 cksum.len = crypto_shash_digestsize(tfm);
1396 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1397 if (cksum.data == NULL)
1398 return -ENOENT;
1399 status = crypto_shash_tfm_digest(tfm, principal,
1400 strlen(principal), cksum.data);
1401 if (status) {
1402 kfree(cksum.data);
1403 return -ENOENT;
1404 }
1405 if (memcmp(crp->cr_princhash.data, cksum.data,
1406 crp->cr_princhash.len)) {
1407 kfree(cksum.data);
1408 return -ENOENT;
1409 }
1410 kfree(cksum.data);
1411 }
1412 crp->cr_clp = clp;
1413 return 0;
1414}
1415
1416static int
1417nfsd4_cld_grace_start(struct nfsd_net *nn)
1418{
1419 int ret;
1420 struct cld_upcall *cup;
1421 struct cld_net *cn = nn->cld_net;
1422
1423 cup = alloc_cld_upcall(nn);
1424 if (!cup) {
1425 ret = -ENOMEM;
1426 goto out_err;
1427 }
1428
1429 cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart;
1430 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1431 if (!ret)
1432 ret = cup->cu_u.cu_msg.cm_status;
1433
1434 free_cld_upcall(cup);
1435out_err:
1436 if (ret)
1437 dprintk("%s: Unable to get clients from userspace: %d\n",
1438 __func__, ret);
1439 return ret;
1440}
1441
1442/* For older nfsdcld's that need cm_gracetime */
1443static void
1444nfsd4_cld_grace_done_v0(struct nfsd_net *nn)
1445{
1446 int ret;
1447 struct cld_upcall *cup;
1448 struct cld_net *cn = nn->cld_net;
1449
1450 cup = alloc_cld_upcall(nn);
1451 if (!cup) {
1452 ret = -ENOMEM;
1453 goto out_err;
1454 }
1455
1456 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1457 cup->cu_u.cu_msg.cm_u.cm_gracetime = nn->boot_time;
1458 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1459 if (!ret)
1460 ret = cup->cu_u.cu_msg.cm_status;
1461
1462 free_cld_upcall(cup);
1463out_err:
1464 if (ret)
1465 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1466}
1467
1468/*
1469 * For newer nfsdcld's that do not need cm_gracetime. We also need to call
1470 * nfs4_release_reclaim() to clear out the reclaim_str_hashtbl.
1471 */
1472static void
1473nfsd4_cld_grace_done(struct nfsd_net *nn)
1474{
1475 int ret;
1476 struct cld_upcall *cup;
1477 struct cld_net *cn = nn->cld_net;
1478
1479 cup = alloc_cld_upcall(nn);
1480 if (!cup) {
1481 ret = -ENOMEM;
1482 goto out_err;
1483 }
1484
1485 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1486 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1487 if (!ret)
1488 ret = cup->cu_u.cu_msg.cm_status;
1489
1490 free_cld_upcall(cup);
1491out_err:
1492 nfs4_release_reclaim(nn);
1493 if (ret)
1494 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1495}
1496
1497static int
1498nfs4_cld_state_init(struct net *net)
1499{
1500 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1501 int i;
1502
1503 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
1504 sizeof(struct list_head),
1505 GFP_KERNEL);
1506 if (!nn->reclaim_str_hashtbl)
1507 return -ENOMEM;
1508
1509 for (i = 0; i < CLIENT_HASH_SIZE; i++)
1510 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
1511 nn->reclaim_str_hashtbl_size = 0;
1512 nn->track_reclaim_completes = true;
1513 atomic_set(&nn->nr_reclaim_complete, 0);
1514
1515 return 0;
1516}
1517
1518static void
1519nfs4_cld_state_shutdown(struct net *net)
1520{
1521 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1522
1523 nn->track_reclaim_completes = false;
1524 kfree(nn->reclaim_str_hashtbl);
1525}
1526
1527static bool
1528cld_running(struct nfsd_net *nn)
1529{
1530 struct cld_net *cn = nn->cld_net;
1531 struct rpc_pipe *pipe = cn->cn_pipe;
1532
1533 return pipe->nreaders || pipe->nwriters;
1534}
1535
1536static int
1537nfsd4_cld_get_version(struct nfsd_net *nn)
1538{
1539 int ret = 0;
1540 struct cld_upcall *cup;
1541 struct cld_net *cn = nn->cld_net;
1542 uint8_t version;
1543
1544 cup = alloc_cld_upcall(nn);
1545 if (!cup) {
1546 ret = -ENOMEM;
1547 goto out_err;
1548 }
1549 cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion;
1550 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
1551 if (!ret) {
1552 ret = cup->cu_u.cu_msg.cm_status;
1553 if (ret)
1554 goto out_free;
1555 version = cup->cu_u.cu_msg.cm_u.cm_version;
1556 dprintk("%s: userspace returned version %u\n",
1557 __func__, version);
1558 if (version < 1)
1559 version = 1;
1560 else if (version > CLD_UPCALL_VERSION)
1561 version = CLD_UPCALL_VERSION;
1562
1563 switch (version) {
1564 case 1:
1565 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1566 break;
1567 case 2:
1568 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2;
1569 break;
1570 default:
1571 break;
1572 }
1573 }
1574out_free:
1575 free_cld_upcall(cup);
1576out_err:
1577 if (ret)
1578 dprintk("%s: Unable to get version from userspace: %d\n",
1579 __func__, ret);
1580 return ret;
1581}
1582
1583static int
1584nfsd4_cld_tracking_init(struct net *net)
1585{
1586 int status;
1587 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1588 bool running;
1589 int retries = 10;
1590 struct crypto_shash *tfm;
1591
1592 status = nfs4_cld_state_init(net);
1593 if (status)
1594 return status;
1595
1596 status = __nfsd4_init_cld_pipe(net);
1597 if (status)
1598 goto err_shutdown;
1599
1600 /*
1601 * rpc pipe upcalls take 30 seconds to time out, so we don't want to
1602 * queue an upcall unless we know that nfsdcld is running (because we
1603 * want this to fail fast so that nfsd4_client_tracking_init() can try
1604 * the next client tracking method). nfsdcld should already be running
1605 * before nfsd is started, so the wait here is for nfsdcld to open the
1606 * pipefs file we just created.
1607 */
1608 while (!(running = cld_running(nn)) && retries--)
1609 msleep(100);
1610
1611 if (!running) {
1612 status = -ETIMEDOUT;
1613 goto err_remove;
1614 }
1615 tfm = crypto_alloc_shash("sha256", 0, 0);
1616 if (IS_ERR(tfm)) {
1617 status = PTR_ERR(tfm);
1618 goto err_remove;
1619 }
1620 nn->cld_net->cn_tfm = tfm;
1621
1622 status = nfsd4_cld_get_version(nn);
1623 if (status == -EOPNOTSUPP)
1624 pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n");
1625
1626 status = nfsd4_cld_grace_start(nn);
1627 if (status) {
1628 if (status == -EOPNOTSUPP)
1629 pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n");
1630 nfs4_release_reclaim(nn);
1631 goto err_remove;
1632 } else
1633 pr_info("NFSD: Using nfsdcld client tracking operations.\n");
1634 return 0;
1635
1636err_remove:
1637 nfsd4_remove_cld_pipe(net);
1638err_shutdown:
1639 nfs4_cld_state_shutdown(net);
1640 return status;
1641}
1642
1643static void
1644nfsd4_cld_tracking_exit(struct net *net)
1645{
1646 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1647
1648 nfs4_release_reclaim(nn);
1649 nfsd4_remove_cld_pipe(net);
1650 nfs4_cld_state_shutdown(net);
1651}
1652
1653/* For older nfsdcld's */
1654static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = {
1655 .init = nfsd4_init_cld_pipe,
1656 .exit = nfsd4_remove_cld_pipe,
1657 .create = nfsd4_cld_create,
1658 .remove = nfsd4_cld_remove,
1659 .check = nfsd4_cld_check_v0,
1660 .grace_done = nfsd4_cld_grace_done_v0,
1661 .version = 1,
1662 .msglen = sizeof(struct cld_msg),
1663};
1664
1665/* For newer nfsdcld's */
1666static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1667 .init = nfsd4_cld_tracking_init,
1668 .exit = nfsd4_cld_tracking_exit,
1669 .create = nfsd4_cld_create,
1670 .remove = nfsd4_cld_remove,
1671 .check = nfsd4_cld_check,
1672 .grace_done = nfsd4_cld_grace_done,
1673 .version = 1,
1674 .msglen = sizeof(struct cld_msg),
1675};
1676
1677/* v2 create/check ops include the principal, if available */
1678static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = {
1679 .init = nfsd4_cld_tracking_init,
1680 .exit = nfsd4_cld_tracking_exit,
1681 .create = nfsd4_cld_create_v2,
1682 .remove = nfsd4_cld_remove,
1683 .check = nfsd4_cld_check_v2,
1684 .grace_done = nfsd4_cld_grace_done,
1685 .version = 2,
1686 .msglen = sizeof(struct cld_msg_v2),
1687};
1688
1689#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1690/* upcall via usermodehelper */
1691static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1692module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1693 S_IRUGO|S_IWUSR);
1694MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1695
1696static bool cltrack_legacy_disable;
1697module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1698MODULE_PARM_DESC(cltrack_legacy_disable,
1699 "Disable legacy recoverydir conversion. Default: false");
1700
1701#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1702#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1703#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1704#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
1705
1706static char *
1707nfsd4_cltrack_legacy_topdir(void)
1708{
1709 int copied;
1710 size_t len;
1711 char *result;
1712
1713 if (cltrack_legacy_disable)
1714 return NULL;
1715
1716 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1717 strlen(nfs4_recoverydir()) + 1;
1718
1719 result = kmalloc(len, GFP_KERNEL);
1720 if (!result)
1721 return result;
1722
1723 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1724 nfs4_recoverydir());
1725 if (copied >= len) {
1726 /* just return nothing if output was truncated */
1727 kfree(result);
1728 return NULL;
1729 }
1730
1731 return result;
1732}
1733
1734static char *
1735nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1736{
1737 int copied;
1738 size_t len;
1739 char *result;
1740
1741 if (cltrack_legacy_disable)
1742 return NULL;
1743
1744 /* +1 is for '/' between "topdir" and "recdir" */
1745 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1746 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1747
1748 result = kmalloc(len, GFP_KERNEL);
1749 if (!result)
1750 return result;
1751
1752 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1753 nfs4_recoverydir());
1754 if (copied > (len - HEXDIR_LEN)) {
1755 /* just return nothing if output will be truncated */
1756 kfree(result);
1757 return NULL;
1758 }
1759
1760 copied = nfs4_make_rec_clidname(result + copied, name);
1761 if (copied) {
1762 kfree(result);
1763 return NULL;
1764 }
1765
1766 return result;
1767}
1768
1769static char *
1770nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
1771{
1772 int copied;
1773 size_t len;
1774 char *result;
1775
1776 /* prefix + Y/N character + terminating NULL */
1777 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1778
1779 result = kmalloc(len, GFP_KERNEL);
1780 if (!result)
1781 return result;
1782
1783 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1784 clp->cl_minorversion ? 'Y' : 'N');
1785 if (copied >= len) {
1786 /* just return nothing if output was truncated */
1787 kfree(result);
1788 return NULL;
1789 }
1790
1791 return result;
1792}
1793
1794static char *
1795nfsd4_cltrack_grace_start(time64_t grace_start)
1796{
1797 int copied;
1798 size_t len;
1799 char *result;
1800
1801 /* prefix + max width of int64_t string + terminating NULL */
1802 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1803
1804 result = kmalloc(len, GFP_KERNEL);
1805 if (!result)
1806 return result;
1807
1808 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%lld",
1809 grace_start);
1810 if (copied >= len) {
1811 /* just return nothing if output was truncated */
1812 kfree(result);
1813 return NULL;
1814 }
1815
1816 return result;
1817}
1818
1819static int
1820nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1821{
1822 char *envp[3];
1823 char *argv[4];
1824 int ret;
1825
1826 if (unlikely(!cltrack_prog[0])) {
1827 dprintk("%s: cltrack_prog is disabled\n", __func__);
1828 return -EACCES;
1829 }
1830
1831 dprintk("%s: cmd: %s\n", __func__, cmd);
1832 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1833 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1834 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
1835
1836 envp[0] = env0;
1837 envp[1] = env1;
1838 envp[2] = NULL;
1839
1840 argv[0] = (char *)cltrack_prog;
1841 argv[1] = cmd;
1842 argv[2] = arg;
1843 argv[3] = NULL;
1844
1845 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1846 /*
1847 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1848 * error. The admin can re-enable it on the fly by using sysfs
1849 * once the problem has been fixed.
1850 */
1851 if (ret == -ENOENT || ret == -EACCES) {
1852 dprintk("NFSD: %s was not found or isn't executable (%d). "
1853 "Setting cltrack_prog to blank string!",
1854 cltrack_prog, ret);
1855 cltrack_prog[0] = '\0';
1856 }
1857 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1858
1859 return ret;
1860}
1861
1862static char *
1863bin_to_hex_dup(const unsigned char *src, int srclen)
1864{
1865 char *buf;
1866
1867 /* +1 for terminating NULL */
1868 buf = kzalloc((srclen * 2) + 1, GFP_KERNEL);
1869 if (!buf)
1870 return buf;
1871
1872 bin2hex(buf, src, srclen);
1873 return buf;
1874}
1875
1876static int
1877nfsd4_umh_cltrack_init(struct net *net)
1878{
1879 int ret;
1880 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1881 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1882
1883 /* XXX: The usermode helper s not working in container yet. */
1884 if (net != &init_net) {
1885 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n");
1886 kfree(grace_start);
1887 return -EINVAL;
1888 }
1889
1890 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1891 kfree(grace_start);
1892 if (!ret)
1893 pr_info("NFSD: Using UMH upcall client tracking operations.\n");
1894 return ret;
1895}
1896
1897static void
1898nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1899{
1900 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1901 TASK_UNINTERRUPTIBLE);
1902}
1903
1904static void
1905nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1906{
1907 clear_and_wake_up_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1908}
1909
1910static void
1911nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1912{
1913 char *hexid, *has_session, *grace_start;
1914 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1915
1916 /*
1917 * With v4.0 clients, there's little difference in outcome between a
1918 * create and check operation, and we can end up calling into this
1919 * function multiple times per client (once for each openowner). So,
1920 * for v4.0 clients skip upcalling once the client has been recorded
1921 * on stable storage.
1922 *
1923 * For v4.1+ clients, the outcome of the two operations is different,
1924 * so we must ensure that we upcall for the create operation. v4.1+
1925 * clients call this on RECLAIM_COMPLETE though, so we should only end
1926 * up doing a single create upcall per client.
1927 */
1928 if (clp->cl_minorversion == 0 &&
1929 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1930 return;
1931
1932 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1933 if (!hexid) {
1934 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1935 return;
1936 }
1937
1938 has_session = nfsd4_cltrack_client_has_session(clp);
1939 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1940
1941 nfsd4_cltrack_upcall_lock(clp);
1942 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1943 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1944 nfsd4_cltrack_upcall_unlock(clp);
1945
1946 kfree(has_session);
1947 kfree(grace_start);
1948 kfree(hexid);
1949}
1950
1951static void
1952nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1953{
1954 char *hexid;
1955
1956 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1957 return;
1958
1959 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1960 if (!hexid) {
1961 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1962 return;
1963 }
1964
1965 nfsd4_cltrack_upcall_lock(clp);
1966 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1967 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1968 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1969 nfsd4_cltrack_upcall_unlock(clp);
1970
1971 kfree(hexid);
1972}
1973
1974static int
1975nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1976{
1977 int ret;
1978 char *hexid, *has_session, *legacy;
1979
1980 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1981 return 0;
1982
1983 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1984 if (!hexid) {
1985 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1986 return -ENOMEM;
1987 }
1988
1989 has_session = nfsd4_cltrack_client_has_session(clp);
1990 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1991
1992 nfsd4_cltrack_upcall_lock(clp);
1993 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1994 ret = 0;
1995 } else {
1996 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1997 if (ret == 0)
1998 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1999 }
2000 nfsd4_cltrack_upcall_unlock(clp);
2001 kfree(has_session);
2002 kfree(legacy);
2003 kfree(hexid);
2004
2005 return ret;
2006}
2007
2008static void
2009nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
2010{
2011 char *legacy;
2012 char timestr[22]; /* FIXME: better way to determine max size? */
2013
2014 sprintf(timestr, "%lld", nn->boot_time);
2015 legacy = nfsd4_cltrack_legacy_topdir();
2016 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
2017 kfree(legacy);
2018}
2019
2020static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
2021 .init = nfsd4_umh_cltrack_init,
2022 .exit = NULL,
2023 .create = nfsd4_umh_cltrack_create,
2024 .remove = nfsd4_umh_cltrack_remove,
2025 .check = nfsd4_umh_cltrack_check,
2026 .grace_done = nfsd4_umh_cltrack_grace_done,
2027 .version = 1,
2028 .msglen = 0,
2029};
2030
2031static inline int check_for_legacy_methods(int status, struct net *net)
2032{
2033 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2034 struct path path;
2035
2036 /*
2037 * Next, try the UMH upcall.
2038 */
2039 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
2040 status = nn->client_tracking_ops->init(net);
2041 if (!status)
2042 return status;
2043
2044 /*
2045 * Finally, See if the recoverydir exists and is a directory.
2046 * If it is, then use the legacy ops.
2047 */
2048 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
2049 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
2050 if (!status) {
2051 status = !d_is_dir(path.dentry);
2052 path_put(&path);
2053 if (status)
2054 return -ENOTDIR;
2055 status = nn->client_tracking_ops->init(net);
2056 }
2057 return status;
2058}
2059#else
2060static inline int check_for_legacy_methods(int status, struct net *net)
2061{
2062 return status;
2063}
2064#endif /* CONFIG_LEGACY_NFSD_CLIENT_TRACKING */
2065
2066int
2067nfsd4_client_tracking_init(struct net *net)
2068{
2069 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2070 int status;
2071
2072 /* just run the init if it the method is already decided */
2073 if (nn->client_tracking_ops)
2074 goto do_init;
2075
2076 /* First, try to use nfsdcld */
2077 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
2078 status = nn->client_tracking_ops->init(net);
2079 if (!status)
2080 return status;
2081 if (status != -ETIMEDOUT) {
2082 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0;
2083 status = nn->client_tracking_ops->init(net);
2084 if (!status)
2085 return status;
2086 }
2087
2088 status = check_for_legacy_methods(status, net);
2089 if (status)
2090 goto out;
2091do_init:
2092 status = nn->client_tracking_ops->init(net);
2093out:
2094 if (status) {
2095 pr_warn("NFSD: Unable to initialize client recovery tracking! (%d)\n", status);
2096 pr_warn("NFSD: Is nfsdcld running? If not, enable CONFIG_NFSD_LEGACY_CLIENT_TRACKING.\n");
2097 nn->client_tracking_ops = NULL;
2098 }
2099 return status;
2100}
2101
2102void
2103nfsd4_client_tracking_exit(struct net *net)
2104{
2105 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2106
2107 if (nn->client_tracking_ops) {
2108 if (nn->client_tracking_ops->exit)
2109 nn->client_tracking_ops->exit(net);
2110 nn->client_tracking_ops = NULL;
2111 }
2112}
2113
2114void
2115nfsd4_client_record_create(struct nfs4_client *clp)
2116{
2117 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2118
2119 if (nn->client_tracking_ops)
2120 nn->client_tracking_ops->create(clp);
2121}
2122
2123void
2124nfsd4_client_record_remove(struct nfs4_client *clp)
2125{
2126 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2127
2128 if (nn->client_tracking_ops)
2129 nn->client_tracking_ops->remove(clp);
2130}
2131
2132int
2133nfsd4_client_record_check(struct nfs4_client *clp)
2134{
2135 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2136
2137 if (nn->client_tracking_ops)
2138 return nn->client_tracking_ops->check(clp);
2139
2140 return -EOPNOTSUPP;
2141}
2142
2143void
2144nfsd4_record_grace_done(struct nfsd_net *nn)
2145{
2146 if (nn->client_tracking_ops)
2147 nn->client_tracking_ops->grace_done(nn);
2148}
2149
2150static int
2151rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
2152{
2153 struct super_block *sb = ptr;
2154 struct net *net = sb->s_fs_info;
2155 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2156 struct cld_net *cn = nn->cld_net;
2157 struct dentry *dentry;
2158 int ret = 0;
2159
2160 if (!try_module_get(THIS_MODULE))
2161 return 0;
2162
2163 if (!cn) {
2164 module_put(THIS_MODULE);
2165 return 0;
2166 }
2167
2168 switch (event) {
2169 case RPC_PIPEFS_MOUNT:
2170 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
2171 if (IS_ERR(dentry)) {
2172 ret = PTR_ERR(dentry);
2173 break;
2174 }
2175 cn->cn_pipe->dentry = dentry;
2176 break;
2177 case RPC_PIPEFS_UMOUNT:
2178 if (cn->cn_pipe->dentry)
2179 nfsd4_cld_unregister_sb(cn->cn_pipe);
2180 break;
2181 default:
2182 ret = -ENOTSUPP;
2183 break;
2184 }
2185 module_put(THIS_MODULE);
2186 return ret;
2187}
2188
2189static struct notifier_block nfsd4_cld_block = {
2190 .notifier_call = rpc_pipefs_event,
2191};
2192
2193int
2194register_cld_notifier(void)
2195{
2196 WARN_ON(!nfsd_net_id);
2197 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
2198}
2199
2200void
2201unregister_cld_notifier(void)
2202{
2203 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
2204}