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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 <crypto/hash.h>
36#include <linux/file.h>
37#include <linux/slab.h>
38#include <linux/namei.h>
39#include <linux/sched.h>
40#include <linux/fs.h>
41#include <linux/module.h>
42#include <net/net_namespace.h>
43#include <linux/sunrpc/rpc_pipe_fs.h>
44#include <linux/sunrpc/clnt.h>
45#include <linux/nfsd/cld.h>
46
47#include "nfsd.h"
48#include "state.h"
49#include "vfs.h"
50#include "netns.h"
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Declarations */
55struct nfsd4_client_tracking_ops {
56 int (*init)(struct net *);
57 void (*exit)(struct net *);
58 void (*create)(struct nfs4_client *);
59 void (*remove)(struct nfs4_client *);
60 int (*check)(struct nfs4_client *);
61 void (*grace_done)(struct nfsd_net *);
62};
63
64/* Globals */
65static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
66
67static int
68nfs4_save_creds(const struct cred **original_creds)
69{
70 struct cred *new;
71
72 new = prepare_creds();
73 if (!new)
74 return -ENOMEM;
75
76 new->fsuid = GLOBAL_ROOT_UID;
77 new->fsgid = GLOBAL_ROOT_GID;
78 *original_creds = override_creds(new);
79 put_cred(new);
80 return 0;
81}
82
83static void
84nfs4_reset_creds(const struct cred *original)
85{
86 revert_creds(original);
87}
88
89static void
90md5_to_hex(char *out, char *md5)
91{
92 int i;
93
94 for (i=0; i<16; i++) {
95 unsigned char c = md5[i];
96
97 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
98 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
99 }
100 *out = '\0';
101}
102
103static int
104nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
105{
106 struct xdr_netobj cksum;
107 struct crypto_shash *tfm;
108 int status;
109
110 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
111 clname->len, clname->data);
112 tfm = crypto_alloc_shash("md5", 0, 0);
113 if (IS_ERR(tfm)) {
114 status = PTR_ERR(tfm);
115 goto out_no_tfm;
116 }
117
118 cksum.len = crypto_shash_digestsize(tfm);
119 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
120 if (cksum.data == NULL) {
121 status = -ENOMEM;
122 goto out;
123 }
124
125 {
126 SHASH_DESC_ON_STACK(desc, tfm);
127
128 desc->tfm = tfm;
129 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
130
131 status = crypto_shash_digest(desc, clname->data, clname->len,
132 cksum.data);
133 shash_desc_zero(desc);
134 }
135
136 if (status)
137 goto out;
138
139 md5_to_hex(dname, cksum.data);
140
141 status = 0;
142out:
143 kfree(cksum.data);
144 crypto_free_shash(tfm);
145out_no_tfm:
146 return status;
147}
148
149/*
150 * If we had an error generating the recdir name for the legacy tracker
151 * then warn the admin. If the error doesn't appear to be transient,
152 * then disable recovery tracking.
153 */
154static void
155legacy_recdir_name_error(struct nfs4_client *clp, int error)
156{
157 printk(KERN_ERR "NFSD: unable to generate recoverydir "
158 "name (%d).\n", error);
159
160 /*
161 * if the algorithm just doesn't exist, then disable the recovery
162 * tracker altogether. The crypto libs will generally return this if
163 * FIPS is enabled as well.
164 */
165 if (error == -ENOENT) {
166 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
167 "Reboot recovery will not function correctly!\n");
168 nfsd4_client_tracking_exit(clp->net);
169 }
170}
171
172static void
173nfsd4_create_clid_dir(struct nfs4_client *clp)
174{
175 const struct cred *original_cred;
176 char dname[HEXDIR_LEN];
177 struct dentry *dir, *dentry;
178 struct nfs4_client_reclaim *crp;
179 int status;
180 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
181
182 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
183 return;
184 if (!nn->rec_file)
185 return;
186
187 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
188 if (status)
189 return legacy_recdir_name_error(clp, status);
190
191 status = nfs4_save_creds(&original_cred);
192 if (status < 0)
193 return;
194
195 status = mnt_want_write_file(nn->rec_file);
196 if (status)
197 goto out_creds;
198
199 dir = nn->rec_file->f_path.dentry;
200 /* lock the parent */
201 inode_lock(d_inode(dir));
202
203 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
204 if (IS_ERR(dentry)) {
205 status = PTR_ERR(dentry);
206 goto out_unlock;
207 }
208 if (d_really_is_positive(dentry))
209 /*
210 * In the 4.1 case, where we're called from
211 * reclaim_complete(), records from the previous reboot
212 * may still be left, so this is OK.
213 *
214 * In the 4.0 case, we should never get here; but we may
215 * as well be forgiving and just succeed silently.
216 */
217 goto out_put;
218 status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU);
219out_put:
220 dput(dentry);
221out_unlock:
222 inode_unlock(d_inode(dir));
223 if (status == 0) {
224 if (nn->in_grace) {
225 crp = nfs4_client_to_reclaim(dname, nn);
226 if (crp)
227 crp->cr_clp = clp;
228 }
229 vfs_fsync(nn->rec_file, 0);
230 } else {
231 printk(KERN_ERR "NFSD: failed to write recovery record"
232 " (err %d); please check that %s exists"
233 " and is writeable", status,
234 user_recovery_dirname);
235 }
236 mnt_drop_write_file(nn->rec_file);
237out_creds:
238 nfs4_reset_creds(original_cred);
239}
240
241typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
242
243struct name_list {
244 char name[HEXDIR_LEN];
245 struct list_head list;
246};
247
248struct nfs4_dir_ctx {
249 struct dir_context ctx;
250 struct list_head names;
251};
252
253static int
254nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
255 loff_t offset, u64 ino, unsigned int d_type)
256{
257 struct nfs4_dir_ctx *ctx =
258 container_of(__ctx, struct nfs4_dir_ctx, ctx);
259 struct name_list *entry;
260
261 if (namlen != HEXDIR_LEN - 1)
262 return 0;
263 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
264 if (entry == NULL)
265 return -ENOMEM;
266 memcpy(entry->name, name, HEXDIR_LEN - 1);
267 entry->name[HEXDIR_LEN - 1] = '\0';
268 list_add(&entry->list, &ctx->names);
269 return 0;
270}
271
272static int
273nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
274{
275 const struct cred *original_cred;
276 struct dentry *dir = nn->rec_file->f_path.dentry;
277 struct nfs4_dir_ctx ctx = {
278 .ctx.actor = nfsd4_build_namelist,
279 .names = LIST_HEAD_INIT(ctx.names)
280 };
281 struct name_list *entry, *tmp;
282 int status;
283
284 status = nfs4_save_creds(&original_cred);
285 if (status < 0)
286 return status;
287
288 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
289 if (status < 0) {
290 nfs4_reset_creds(original_cred);
291 return status;
292 }
293
294 status = iterate_dir(nn->rec_file, &ctx.ctx);
295 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
296
297 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
298 if (!status) {
299 struct dentry *dentry;
300 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
301 if (IS_ERR(dentry)) {
302 status = PTR_ERR(dentry);
303 break;
304 }
305 status = f(dir, dentry, nn);
306 dput(dentry);
307 }
308 list_del(&entry->list);
309 kfree(entry);
310 }
311 inode_unlock(d_inode(dir));
312 nfs4_reset_creds(original_cred);
313
314 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
315 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name);
316 list_del(&entry->list);
317 kfree(entry);
318 }
319 return status;
320}
321
322static int
323nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
324{
325 struct dentry *dir, *dentry;
326 int status;
327
328 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
329
330 dir = nn->rec_file->f_path.dentry;
331 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
332 dentry = lookup_one_len(name, dir, namlen);
333 if (IS_ERR(dentry)) {
334 status = PTR_ERR(dentry);
335 goto out_unlock;
336 }
337 status = -ENOENT;
338 if (d_really_is_negative(dentry))
339 goto out;
340 status = vfs_rmdir(d_inode(dir), dentry);
341out:
342 dput(dentry);
343out_unlock:
344 inode_unlock(d_inode(dir));
345 return status;
346}
347
348static void
349nfsd4_remove_clid_dir(struct nfs4_client *clp)
350{
351 const struct cred *original_cred;
352 struct nfs4_client_reclaim *crp;
353 char dname[HEXDIR_LEN];
354 int status;
355 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
356
357 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
358 return;
359
360 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
361 if (status)
362 return legacy_recdir_name_error(clp, status);
363
364 status = mnt_want_write_file(nn->rec_file);
365 if (status)
366 goto out;
367 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
368
369 status = nfs4_save_creds(&original_cred);
370 if (status < 0)
371 goto out_drop_write;
372
373 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
374 nfs4_reset_creds(original_cred);
375 if (status == 0) {
376 vfs_fsync(nn->rec_file, 0);
377 if (nn->in_grace) {
378 /* remove reclaim record */
379 crp = nfsd4_find_reclaim_client(dname, nn);
380 if (crp)
381 nfs4_remove_reclaim_record(crp, nn);
382 }
383 }
384out_drop_write:
385 mnt_drop_write_file(nn->rec_file);
386out:
387 if (status)
388 printk("NFSD: Failed to remove expired client state directory"
389 " %.*s\n", HEXDIR_LEN, dname);
390}
391
392static int
393purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
394{
395 int status;
396
397 if (nfs4_has_reclaimed_state(child->d_name.name, nn))
398 return 0;
399
400 status = vfs_rmdir(d_inode(parent), child);
401 if (status)
402 printk("failed to remove client recovery directory %pd\n",
403 child);
404 /* Keep trying, success or failure: */
405 return 0;
406}
407
408static void
409nfsd4_recdir_purge_old(struct nfsd_net *nn)
410{
411 int status;
412
413 nn->in_grace = false;
414 if (!nn->rec_file)
415 return;
416 status = mnt_want_write_file(nn->rec_file);
417 if (status)
418 goto out;
419 status = nfsd4_list_rec_dir(purge_old, nn);
420 if (status == 0)
421 vfs_fsync(nn->rec_file, 0);
422 mnt_drop_write_file(nn->rec_file);
423out:
424 nfs4_release_reclaim(nn);
425 if (status)
426 printk("nfsd4: failed to purge old clients from recovery"
427 " directory %pD\n", nn->rec_file);
428}
429
430static int
431load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
432{
433 if (child->d_name.len != HEXDIR_LEN - 1) {
434 printk("nfsd4: illegal name %pd in recovery directory\n",
435 child);
436 /* Keep trying; maybe the others are OK: */
437 return 0;
438 }
439 nfs4_client_to_reclaim(child->d_name.name, nn);
440 return 0;
441}
442
443static int
444nfsd4_recdir_load(struct net *net) {
445 int status;
446 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
447
448 if (!nn->rec_file)
449 return 0;
450
451 status = nfsd4_list_rec_dir(load_recdir, nn);
452 if (status)
453 printk("nfsd4: failed loading clients from recovery"
454 " directory %pD\n", nn->rec_file);
455 return status;
456}
457
458/*
459 * Hold reference to the recovery directory.
460 */
461
462static int
463nfsd4_init_recdir(struct net *net)
464{
465 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
466 const struct cred *original_cred;
467 int status;
468
469 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
470 user_recovery_dirname);
471
472 BUG_ON(nn->rec_file);
473
474 status = nfs4_save_creds(&original_cred);
475 if (status < 0) {
476 printk("NFSD: Unable to change credentials to find recovery"
477 " directory: error %d\n",
478 status);
479 return status;
480 }
481
482 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
483 if (IS_ERR(nn->rec_file)) {
484 printk("NFSD: unable to find recovery directory %s\n",
485 user_recovery_dirname);
486 status = PTR_ERR(nn->rec_file);
487 nn->rec_file = NULL;
488 }
489
490 nfs4_reset_creds(original_cred);
491 if (!status)
492 nn->in_grace = true;
493 return status;
494}
495
496static void
497nfsd4_shutdown_recdir(struct net *net)
498{
499 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
500
501 if (!nn->rec_file)
502 return;
503 fput(nn->rec_file);
504 nn->rec_file = NULL;
505}
506
507static int
508nfs4_legacy_state_init(struct net *net)
509{
510 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
511 int i;
512
513 nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
514 CLIENT_HASH_SIZE, GFP_KERNEL);
515 if (!nn->reclaim_str_hashtbl)
516 return -ENOMEM;
517
518 for (i = 0; i < CLIENT_HASH_SIZE; i++)
519 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
520 nn->reclaim_str_hashtbl_size = 0;
521
522 return 0;
523}
524
525static void
526nfs4_legacy_state_shutdown(struct net *net)
527{
528 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
529
530 kfree(nn->reclaim_str_hashtbl);
531}
532
533static int
534nfsd4_load_reboot_recovery_data(struct net *net)
535{
536 int status;
537
538 status = nfsd4_init_recdir(net);
539 if (status)
540 return status;
541
542 status = nfsd4_recdir_load(net);
543 if (status)
544 nfsd4_shutdown_recdir(net);
545
546 return status;
547}
548
549static int
550nfsd4_legacy_tracking_init(struct net *net)
551{
552 int status;
553
554 /* XXX: The legacy code won't work in a container */
555 if (net != &init_net) {
556 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n");
557 return -EINVAL;
558 }
559
560 status = nfs4_legacy_state_init(net);
561 if (status)
562 return status;
563
564 status = nfsd4_load_reboot_recovery_data(net);
565 if (status)
566 goto err;
567 return 0;
568
569err:
570 nfs4_legacy_state_shutdown(net);
571 return status;
572}
573
574static void
575nfsd4_legacy_tracking_exit(struct net *net)
576{
577 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
578
579 nfs4_release_reclaim(nn);
580 nfsd4_shutdown_recdir(net);
581 nfs4_legacy_state_shutdown(net);
582}
583
584/*
585 * Change the NFSv4 recovery directory to recdir.
586 */
587int
588nfs4_reset_recoverydir(char *recdir)
589{
590 int status;
591 struct path path;
592
593 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
594 if (status)
595 return status;
596 status = -ENOTDIR;
597 if (d_is_dir(path.dentry)) {
598 strcpy(user_recovery_dirname, recdir);
599 status = 0;
600 }
601 path_put(&path);
602 return status;
603}
604
605char *
606nfs4_recoverydir(void)
607{
608 return user_recovery_dirname;
609}
610
611static int
612nfsd4_check_legacy_client(struct nfs4_client *clp)
613{
614 int status;
615 char dname[HEXDIR_LEN];
616 struct nfs4_client_reclaim *crp;
617 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
618
619 /* did we already find that this client is stable? */
620 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
621 return 0;
622
623 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
624 if (status) {
625 legacy_recdir_name_error(clp, status);
626 return status;
627 }
628
629 /* look for it in the reclaim hashtable otherwise */
630 crp = nfsd4_find_reclaim_client(dname, nn);
631 if (crp) {
632 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
633 crp->cr_clp = clp;
634 return 0;
635 }
636
637 return -ENOENT;
638}
639
640static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
641 .init = nfsd4_legacy_tracking_init,
642 .exit = nfsd4_legacy_tracking_exit,
643 .create = nfsd4_create_clid_dir,
644 .remove = nfsd4_remove_clid_dir,
645 .check = nfsd4_check_legacy_client,
646 .grace_done = nfsd4_recdir_purge_old,
647};
648
649/* Globals */
650#define NFSD_PIPE_DIR "nfsd"
651#define NFSD_CLD_PIPE "cld"
652
653/* per-net-ns structure for holding cld upcall info */
654struct cld_net {
655 struct rpc_pipe *cn_pipe;
656 spinlock_t cn_lock;
657 struct list_head cn_list;
658 unsigned int cn_xid;
659};
660
661struct cld_upcall {
662 struct list_head cu_list;
663 struct cld_net *cu_net;
664 struct task_struct *cu_task;
665 struct cld_msg cu_msg;
666};
667
668static int
669__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
670{
671 int ret;
672 struct rpc_pipe_msg msg;
673
674 memset(&msg, 0, sizeof(msg));
675 msg.data = cmsg;
676 msg.len = sizeof(*cmsg);
677
678 /*
679 * Set task state before we queue the upcall. That prevents
680 * wake_up_process in the downcall from racing with schedule.
681 */
682 set_current_state(TASK_UNINTERRUPTIBLE);
683 ret = rpc_queue_upcall(pipe, &msg);
684 if (ret < 0) {
685 set_current_state(TASK_RUNNING);
686 goto out;
687 }
688
689 schedule();
690
691 if (msg.errno < 0)
692 ret = msg.errno;
693out:
694 return ret;
695}
696
697static int
698cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
699{
700 int ret;
701
702 /*
703 * -EAGAIN occurs when pipe is closed and reopened while there are
704 * upcalls queued.
705 */
706 do {
707 ret = __cld_pipe_upcall(pipe, cmsg);
708 } while (ret == -EAGAIN);
709
710 return ret;
711}
712
713static ssize_t
714cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
715{
716 struct cld_upcall *tmp, *cup;
717 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
718 uint32_t xid;
719 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
720 nfsd_net_id);
721 struct cld_net *cn = nn->cld_net;
722
723 if (mlen != sizeof(*cmsg)) {
724 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
725 sizeof(*cmsg));
726 return -EINVAL;
727 }
728
729 /* copy just the xid so we can try to find that */
730 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
731 dprintk("%s: error when copying xid from userspace", __func__);
732 return -EFAULT;
733 }
734
735 /* walk the list and find corresponding xid */
736 cup = NULL;
737 spin_lock(&cn->cn_lock);
738 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
739 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
740 cup = tmp;
741 list_del_init(&cup->cu_list);
742 break;
743 }
744 }
745 spin_unlock(&cn->cn_lock);
746
747 /* couldn't find upcall? */
748 if (!cup) {
749 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
750 return -EINVAL;
751 }
752
753 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
754 return -EFAULT;
755
756 wake_up_process(cup->cu_task);
757 return mlen;
758}
759
760static void
761cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
762{
763 struct cld_msg *cmsg = msg->data;
764 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
765 cu_msg);
766
767 /* errno >= 0 means we got a downcall */
768 if (msg->errno >= 0)
769 return;
770
771 wake_up_process(cup->cu_task);
772}
773
774static const struct rpc_pipe_ops cld_upcall_ops = {
775 .upcall = rpc_pipe_generic_upcall,
776 .downcall = cld_pipe_downcall,
777 .destroy_msg = cld_pipe_destroy_msg,
778};
779
780static struct dentry *
781nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
782{
783 struct dentry *dir, *dentry;
784
785 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
786 if (dir == NULL)
787 return ERR_PTR(-ENOENT);
788 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
789 dput(dir);
790 return dentry;
791}
792
793static void
794nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
795{
796 if (pipe->dentry)
797 rpc_unlink(pipe->dentry);
798}
799
800static struct dentry *
801nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
802{
803 struct super_block *sb;
804 struct dentry *dentry;
805
806 sb = rpc_get_sb_net(net);
807 if (!sb)
808 return NULL;
809 dentry = nfsd4_cld_register_sb(sb, pipe);
810 rpc_put_sb_net(net);
811 return dentry;
812}
813
814static void
815nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
816{
817 struct super_block *sb;
818
819 sb = rpc_get_sb_net(net);
820 if (sb) {
821 nfsd4_cld_unregister_sb(pipe);
822 rpc_put_sb_net(net);
823 }
824}
825
826/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
827static int
828nfsd4_init_cld_pipe(struct net *net)
829{
830 int ret;
831 struct dentry *dentry;
832 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
833 struct cld_net *cn;
834
835 if (nn->cld_net)
836 return 0;
837
838 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
839 if (!cn) {
840 ret = -ENOMEM;
841 goto err;
842 }
843
844 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
845 if (IS_ERR(cn->cn_pipe)) {
846 ret = PTR_ERR(cn->cn_pipe);
847 goto err;
848 }
849 spin_lock_init(&cn->cn_lock);
850 INIT_LIST_HEAD(&cn->cn_list);
851
852 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
853 if (IS_ERR(dentry)) {
854 ret = PTR_ERR(dentry);
855 goto err_destroy_data;
856 }
857
858 cn->cn_pipe->dentry = dentry;
859 nn->cld_net = cn;
860 return 0;
861
862err_destroy_data:
863 rpc_destroy_pipe_data(cn->cn_pipe);
864err:
865 kfree(cn);
866 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
867 ret);
868 return ret;
869}
870
871static void
872nfsd4_remove_cld_pipe(struct net *net)
873{
874 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
875 struct cld_net *cn = nn->cld_net;
876
877 nfsd4_cld_unregister_net(net, cn->cn_pipe);
878 rpc_destroy_pipe_data(cn->cn_pipe);
879 kfree(nn->cld_net);
880 nn->cld_net = NULL;
881}
882
883static struct cld_upcall *
884alloc_cld_upcall(struct cld_net *cn)
885{
886 struct cld_upcall *new, *tmp;
887
888 new = kzalloc(sizeof(*new), GFP_KERNEL);
889 if (!new)
890 return new;
891
892 /* FIXME: hard cap on number in flight? */
893restart_search:
894 spin_lock(&cn->cn_lock);
895 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
896 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
897 cn->cn_xid++;
898 spin_unlock(&cn->cn_lock);
899 goto restart_search;
900 }
901 }
902 new->cu_task = current;
903 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
904 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
905 new->cu_net = cn;
906 list_add(&new->cu_list, &cn->cn_list);
907 spin_unlock(&cn->cn_lock);
908
909 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
910
911 return new;
912}
913
914static void
915free_cld_upcall(struct cld_upcall *victim)
916{
917 struct cld_net *cn = victim->cu_net;
918
919 spin_lock(&cn->cn_lock);
920 list_del(&victim->cu_list);
921 spin_unlock(&cn->cn_lock);
922 kfree(victim);
923}
924
925/* Ask daemon to create a new record */
926static void
927nfsd4_cld_create(struct nfs4_client *clp)
928{
929 int ret;
930 struct cld_upcall *cup;
931 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
932 struct cld_net *cn = nn->cld_net;
933
934 /* Don't upcall if it's already stored */
935 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
936 return;
937
938 cup = alloc_cld_upcall(cn);
939 if (!cup) {
940 ret = -ENOMEM;
941 goto out_err;
942 }
943
944 cup->cu_msg.cm_cmd = Cld_Create;
945 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
946 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
947 clp->cl_name.len);
948
949 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
950 if (!ret) {
951 ret = cup->cu_msg.cm_status;
952 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
953 }
954
955 free_cld_upcall(cup);
956out_err:
957 if (ret)
958 printk(KERN_ERR "NFSD: Unable to create client "
959 "record on stable storage: %d\n", ret);
960}
961
962/* Ask daemon to create a new record */
963static void
964nfsd4_cld_remove(struct nfs4_client *clp)
965{
966 int ret;
967 struct cld_upcall *cup;
968 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
969 struct cld_net *cn = nn->cld_net;
970
971 /* Don't upcall if it's already removed */
972 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
973 return;
974
975 cup = alloc_cld_upcall(cn);
976 if (!cup) {
977 ret = -ENOMEM;
978 goto out_err;
979 }
980
981 cup->cu_msg.cm_cmd = Cld_Remove;
982 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
983 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
984 clp->cl_name.len);
985
986 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
987 if (!ret) {
988 ret = cup->cu_msg.cm_status;
989 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
990 }
991
992 free_cld_upcall(cup);
993out_err:
994 if (ret)
995 printk(KERN_ERR "NFSD: Unable to remove client "
996 "record from stable storage: %d\n", ret);
997}
998
999/* Check for presence of a record, and update its timestamp */
1000static int
1001nfsd4_cld_check(struct nfs4_client *clp)
1002{
1003 int ret;
1004 struct cld_upcall *cup;
1005 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1006 struct cld_net *cn = nn->cld_net;
1007
1008 /* Don't upcall if one was already stored during this grace pd */
1009 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1010 return 0;
1011
1012 cup = alloc_cld_upcall(cn);
1013 if (!cup) {
1014 printk(KERN_ERR "NFSD: Unable to check client record on "
1015 "stable storage: %d\n", -ENOMEM);
1016 return -ENOMEM;
1017 }
1018
1019 cup->cu_msg.cm_cmd = Cld_Check;
1020 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1021 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1022 clp->cl_name.len);
1023
1024 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1025 if (!ret) {
1026 ret = cup->cu_msg.cm_status;
1027 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1028 }
1029
1030 free_cld_upcall(cup);
1031 return ret;
1032}
1033
1034static void
1035nfsd4_cld_grace_done(struct nfsd_net *nn)
1036{
1037 int ret;
1038 struct cld_upcall *cup;
1039 struct cld_net *cn = nn->cld_net;
1040
1041 cup = alloc_cld_upcall(cn);
1042 if (!cup) {
1043 ret = -ENOMEM;
1044 goto out_err;
1045 }
1046
1047 cup->cu_msg.cm_cmd = Cld_GraceDone;
1048 cup->cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time;
1049 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1050 if (!ret)
1051 ret = cup->cu_msg.cm_status;
1052
1053 free_cld_upcall(cup);
1054out_err:
1055 if (ret)
1056 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1057}
1058
1059static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1060 .init = nfsd4_init_cld_pipe,
1061 .exit = nfsd4_remove_cld_pipe,
1062 .create = nfsd4_cld_create,
1063 .remove = nfsd4_cld_remove,
1064 .check = nfsd4_cld_check,
1065 .grace_done = nfsd4_cld_grace_done,
1066};
1067
1068/* upcall via usermodehelper */
1069static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1070module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1071 S_IRUGO|S_IWUSR);
1072MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1073
1074static bool cltrack_legacy_disable;
1075module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1076MODULE_PARM_DESC(cltrack_legacy_disable,
1077 "Disable legacy recoverydir conversion. Default: false");
1078
1079#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1080#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1081#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1082#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
1083
1084static char *
1085nfsd4_cltrack_legacy_topdir(void)
1086{
1087 int copied;
1088 size_t len;
1089 char *result;
1090
1091 if (cltrack_legacy_disable)
1092 return NULL;
1093
1094 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1095 strlen(nfs4_recoverydir()) + 1;
1096
1097 result = kmalloc(len, GFP_KERNEL);
1098 if (!result)
1099 return result;
1100
1101 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1102 nfs4_recoverydir());
1103 if (copied >= len) {
1104 /* just return nothing if output was truncated */
1105 kfree(result);
1106 return NULL;
1107 }
1108
1109 return result;
1110}
1111
1112static char *
1113nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1114{
1115 int copied;
1116 size_t len;
1117 char *result;
1118
1119 if (cltrack_legacy_disable)
1120 return NULL;
1121
1122 /* +1 is for '/' between "topdir" and "recdir" */
1123 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1124 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1125
1126 result = kmalloc(len, GFP_KERNEL);
1127 if (!result)
1128 return result;
1129
1130 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1131 nfs4_recoverydir());
1132 if (copied > (len - HEXDIR_LEN)) {
1133 /* just return nothing if output will be truncated */
1134 kfree(result);
1135 return NULL;
1136 }
1137
1138 copied = nfs4_make_rec_clidname(result + copied, name);
1139 if (copied) {
1140 kfree(result);
1141 return NULL;
1142 }
1143
1144 return result;
1145}
1146
1147static char *
1148nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
1149{
1150 int copied;
1151 size_t len;
1152 char *result;
1153
1154 /* prefix + Y/N character + terminating NULL */
1155 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1156
1157 result = kmalloc(len, GFP_KERNEL);
1158 if (!result)
1159 return result;
1160
1161 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1162 clp->cl_minorversion ? 'Y' : 'N');
1163 if (copied >= len) {
1164 /* just return nothing if output was truncated */
1165 kfree(result);
1166 return NULL;
1167 }
1168
1169 return result;
1170}
1171
1172static char *
1173nfsd4_cltrack_grace_start(time_t grace_start)
1174{
1175 int copied;
1176 size_t len;
1177 char *result;
1178
1179 /* prefix + max width of int64_t string + terminating NULL */
1180 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1181
1182 result = kmalloc(len, GFP_KERNEL);
1183 if (!result)
1184 return result;
1185
1186 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld",
1187 grace_start);
1188 if (copied >= len) {
1189 /* just return nothing if output was truncated */
1190 kfree(result);
1191 return NULL;
1192 }
1193
1194 return result;
1195}
1196
1197static int
1198nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1199{
1200 char *envp[3];
1201 char *argv[4];
1202 int ret;
1203
1204 if (unlikely(!cltrack_prog[0])) {
1205 dprintk("%s: cltrack_prog is disabled\n", __func__);
1206 return -EACCES;
1207 }
1208
1209 dprintk("%s: cmd: %s\n", __func__, cmd);
1210 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1211 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1212 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
1213
1214 envp[0] = env0;
1215 envp[1] = env1;
1216 envp[2] = NULL;
1217
1218 argv[0] = (char *)cltrack_prog;
1219 argv[1] = cmd;
1220 argv[2] = arg;
1221 argv[3] = NULL;
1222
1223 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1224 /*
1225 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1226 * error. The admin can re-enable it on the fly by using sysfs
1227 * once the problem has been fixed.
1228 */
1229 if (ret == -ENOENT || ret == -EACCES) {
1230 dprintk("NFSD: %s was not found or isn't executable (%d). "
1231 "Setting cltrack_prog to blank string!",
1232 cltrack_prog, ret);
1233 cltrack_prog[0] = '\0';
1234 }
1235 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1236
1237 return ret;
1238}
1239
1240static char *
1241bin_to_hex_dup(const unsigned char *src, int srclen)
1242{
1243 int i;
1244 char *buf, *hex;
1245
1246 /* +1 for terminating NULL */
1247 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1248 if (!buf)
1249 return buf;
1250
1251 hex = buf;
1252 for (i = 0; i < srclen; i++) {
1253 sprintf(hex, "%2.2x", *src++);
1254 hex += 2;
1255 }
1256 return buf;
1257}
1258
1259static int
1260nfsd4_umh_cltrack_init(struct net *net)
1261{
1262 int ret;
1263 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1264 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1265
1266 /* XXX: The usermode helper s not working in container yet. */
1267 if (net != &init_net) {
1268 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n");
1269 kfree(grace_start);
1270 return -EINVAL;
1271 }
1272
1273 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1274 kfree(grace_start);
1275 return ret;
1276}
1277
1278static void
1279nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1280{
1281 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1282 TASK_UNINTERRUPTIBLE);
1283}
1284
1285static void
1286nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1287{
1288 smp_mb__before_atomic();
1289 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1290 smp_mb__after_atomic();
1291 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
1292}
1293
1294static void
1295nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1296{
1297 char *hexid, *has_session, *grace_start;
1298 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1299
1300 /*
1301 * With v4.0 clients, there's little difference in outcome between a
1302 * create and check operation, and we can end up calling into this
1303 * function multiple times per client (once for each openowner). So,
1304 * for v4.0 clients skip upcalling once the client has been recorded
1305 * on stable storage.
1306 *
1307 * For v4.1+ clients, the outcome of the two operations is different,
1308 * so we must ensure that we upcall for the create operation. v4.1+
1309 * clients call this on RECLAIM_COMPLETE though, so we should only end
1310 * up doing a single create upcall per client.
1311 */
1312 if (clp->cl_minorversion == 0 &&
1313 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1314 return;
1315
1316 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1317 if (!hexid) {
1318 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1319 return;
1320 }
1321
1322 has_session = nfsd4_cltrack_client_has_session(clp);
1323 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1324
1325 nfsd4_cltrack_upcall_lock(clp);
1326 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1327 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1328 nfsd4_cltrack_upcall_unlock(clp);
1329
1330 kfree(has_session);
1331 kfree(grace_start);
1332 kfree(hexid);
1333}
1334
1335static void
1336nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1337{
1338 char *hexid;
1339
1340 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1341 return;
1342
1343 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1344 if (!hexid) {
1345 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1346 return;
1347 }
1348
1349 nfsd4_cltrack_upcall_lock(clp);
1350 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1351 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1352 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1353 nfsd4_cltrack_upcall_unlock(clp);
1354
1355 kfree(hexid);
1356}
1357
1358static int
1359nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1360{
1361 int ret;
1362 char *hexid, *has_session, *legacy;
1363
1364 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1365 return 0;
1366
1367 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1368 if (!hexid) {
1369 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1370 return -ENOMEM;
1371 }
1372
1373 has_session = nfsd4_cltrack_client_has_session(clp);
1374 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1375
1376 nfsd4_cltrack_upcall_lock(clp);
1377 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1378 ret = 0;
1379 } else {
1380 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1381 if (ret == 0)
1382 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1383 }
1384 nfsd4_cltrack_upcall_unlock(clp);
1385 kfree(has_session);
1386 kfree(legacy);
1387 kfree(hexid);
1388
1389 return ret;
1390}
1391
1392static void
1393nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
1394{
1395 char *legacy;
1396 char timestr[22]; /* FIXME: better way to determine max size? */
1397
1398 sprintf(timestr, "%ld", nn->boot_time);
1399 legacy = nfsd4_cltrack_legacy_topdir();
1400 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
1401 kfree(legacy);
1402}
1403
1404static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1405 .init = nfsd4_umh_cltrack_init,
1406 .exit = NULL,
1407 .create = nfsd4_umh_cltrack_create,
1408 .remove = nfsd4_umh_cltrack_remove,
1409 .check = nfsd4_umh_cltrack_check,
1410 .grace_done = nfsd4_umh_cltrack_grace_done,
1411};
1412
1413int
1414nfsd4_client_tracking_init(struct net *net)
1415{
1416 int status;
1417 struct path path;
1418 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1419
1420 /* just run the init if it the method is already decided */
1421 if (nn->client_tracking_ops)
1422 goto do_init;
1423
1424 /*
1425 * First, try a UMH upcall. It should succeed or fail quickly, so
1426 * there's little harm in trying that first.
1427 */
1428 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
1429 status = nn->client_tracking_ops->init(net);
1430 if (!status)
1431 return status;
1432
1433 /*
1434 * See if the recoverydir exists and is a directory. If it is,
1435 * then use the legacy ops.
1436 */
1437 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
1438 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1439 if (!status) {
1440 status = d_is_dir(path.dentry);
1441 path_put(&path);
1442 if (status)
1443 goto do_init;
1444 }
1445
1446 /* Finally, try to use nfsdcld */
1447 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1448 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1449 "removed in 3.10. Please transition to using "
1450 "nfsdcltrack.\n");
1451do_init:
1452 status = nn->client_tracking_ops->init(net);
1453 if (status) {
1454 printk(KERN_WARNING "NFSD: Unable to initialize client "
1455 "recovery tracking! (%d)\n", status);
1456 nn->client_tracking_ops = NULL;
1457 }
1458 return status;
1459}
1460
1461void
1462nfsd4_client_tracking_exit(struct net *net)
1463{
1464 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1465
1466 if (nn->client_tracking_ops) {
1467 if (nn->client_tracking_ops->exit)
1468 nn->client_tracking_ops->exit(net);
1469 nn->client_tracking_ops = NULL;
1470 }
1471}
1472
1473void
1474nfsd4_client_record_create(struct nfs4_client *clp)
1475{
1476 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1477
1478 if (nn->client_tracking_ops)
1479 nn->client_tracking_ops->create(clp);
1480}
1481
1482void
1483nfsd4_client_record_remove(struct nfs4_client *clp)
1484{
1485 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1486
1487 if (nn->client_tracking_ops)
1488 nn->client_tracking_ops->remove(clp);
1489}
1490
1491int
1492nfsd4_client_record_check(struct nfs4_client *clp)
1493{
1494 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1495
1496 if (nn->client_tracking_ops)
1497 return nn->client_tracking_ops->check(clp);
1498
1499 return -EOPNOTSUPP;
1500}
1501
1502void
1503nfsd4_record_grace_done(struct nfsd_net *nn)
1504{
1505 if (nn->client_tracking_ops)
1506 nn->client_tracking_ops->grace_done(nn);
1507}
1508
1509static int
1510rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1511{
1512 struct super_block *sb = ptr;
1513 struct net *net = sb->s_fs_info;
1514 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1515 struct cld_net *cn = nn->cld_net;
1516 struct dentry *dentry;
1517 int ret = 0;
1518
1519 if (!try_module_get(THIS_MODULE))
1520 return 0;
1521
1522 if (!cn) {
1523 module_put(THIS_MODULE);
1524 return 0;
1525 }
1526
1527 switch (event) {
1528 case RPC_PIPEFS_MOUNT:
1529 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1530 if (IS_ERR(dentry)) {
1531 ret = PTR_ERR(dentry);
1532 break;
1533 }
1534 cn->cn_pipe->dentry = dentry;
1535 break;
1536 case RPC_PIPEFS_UMOUNT:
1537 if (cn->cn_pipe->dentry)
1538 nfsd4_cld_unregister_sb(cn->cn_pipe);
1539 break;
1540 default:
1541 ret = -ENOTSUPP;
1542 break;
1543 }
1544 module_put(THIS_MODULE);
1545 return ret;
1546}
1547
1548static struct notifier_block nfsd4_cld_block = {
1549 .notifier_call = rpc_pipefs_event,
1550};
1551
1552int
1553register_cld_notifier(void)
1554{
1555 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1556}
1557
1558void
1559unregister_cld_notifier(void)
1560{
1561 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
1562}
1/*
2* Copyright (c) 2004 The Regents of the University of Michigan.
3* Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
4* All rights reserved.
5*
6* Andy Adamson <andros@citi.umich.edu>
7*
8* Redistribution and use in source and binary forms, with or without
9* modification, are permitted provided that the following conditions
10* are met:
11*
12* 1. Redistributions of source code must retain the above copyright
13* notice, this list of conditions and the following disclaimer.
14* 2. Redistributions in binary form must reproduce the above copyright
15* notice, this list of conditions and the following disclaimer in the
16* documentation and/or other materials provided with the distribution.
17* 3. Neither the name of the University nor the names of its
18* contributors may be used to endorse or promote products derived
19* from this software without specific prior written permission.
20*
21* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32*
33*/
34
35#include <crypto/hash.h>
36#include <linux/file.h>
37#include <linux/slab.h>
38#include <linux/namei.h>
39#include <linux/sched.h>
40#include <linux/fs.h>
41#include <linux/module.h>
42#include <net/net_namespace.h>
43#include <linux/sunrpc/rpc_pipe_fs.h>
44#include <linux/sunrpc/clnt.h>
45#include <linux/nfsd/cld.h>
46
47#include "nfsd.h"
48#include "state.h"
49#include "vfs.h"
50#include "netns.h"
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Declarations */
55struct nfsd4_client_tracking_ops {
56 int (*init)(struct net *);
57 void (*exit)(struct net *);
58 void (*create)(struct nfs4_client *);
59 void (*remove)(struct nfs4_client *);
60 int (*check)(struct nfs4_client *);
61 void (*grace_done)(struct nfsd_net *);
62 uint8_t version;
63 size_t msglen;
64};
65
66static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops;
67static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2;
68
69/* Globals */
70static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
71
72static int
73nfs4_save_creds(const struct cred **original_creds)
74{
75 struct cred *new;
76
77 new = prepare_creds();
78 if (!new)
79 return -ENOMEM;
80
81 new->fsuid = GLOBAL_ROOT_UID;
82 new->fsgid = GLOBAL_ROOT_GID;
83 *original_creds = override_creds(new);
84 put_cred(new);
85 return 0;
86}
87
88static void
89nfs4_reset_creds(const struct cred *original)
90{
91 revert_creds(original);
92}
93
94static void
95md5_to_hex(char *out, char *md5)
96{
97 int i;
98
99 for (i=0; i<16; i++) {
100 unsigned char c = md5[i];
101
102 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
103 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
104 }
105 *out = '\0';
106}
107
108static int
109nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
110{
111 struct xdr_netobj cksum;
112 struct crypto_shash *tfm;
113 int status;
114
115 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
116 clname->len, clname->data);
117 tfm = crypto_alloc_shash("md5", 0, 0);
118 if (IS_ERR(tfm)) {
119 status = PTR_ERR(tfm);
120 goto out_no_tfm;
121 }
122
123 cksum.len = crypto_shash_digestsize(tfm);
124 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
125 if (cksum.data == NULL) {
126 status = -ENOMEM;
127 goto out;
128 }
129
130 {
131 SHASH_DESC_ON_STACK(desc, tfm);
132
133 desc->tfm = tfm;
134
135 status = crypto_shash_digest(desc, clname->data, clname->len,
136 cksum.data);
137 shash_desc_zero(desc);
138 }
139
140 if (status)
141 goto out;
142
143 md5_to_hex(dname, cksum.data);
144
145 status = 0;
146out:
147 kfree(cksum.data);
148 crypto_free_shash(tfm);
149out_no_tfm:
150 return status;
151}
152
153/*
154 * If we had an error generating the recdir name for the legacy tracker
155 * then warn the admin. If the error doesn't appear to be transient,
156 * then disable recovery tracking.
157 */
158static void
159legacy_recdir_name_error(struct nfs4_client *clp, int error)
160{
161 printk(KERN_ERR "NFSD: unable to generate recoverydir "
162 "name (%d).\n", error);
163
164 /*
165 * if the algorithm just doesn't exist, then disable the recovery
166 * tracker altogether. The crypto libs will generally return this if
167 * FIPS is enabled as well.
168 */
169 if (error == -ENOENT) {
170 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
171 "Reboot recovery will not function correctly!\n");
172 nfsd4_client_tracking_exit(clp->net);
173 }
174}
175
176static void
177__nfsd4_create_reclaim_record_grace(struct nfs4_client *clp,
178 const char *dname, int len, struct nfsd_net *nn)
179{
180 struct xdr_netobj name;
181 struct xdr_netobj princhash = { .len = 0, .data = NULL };
182 struct nfs4_client_reclaim *crp;
183
184 name.data = kmemdup(dname, len, GFP_KERNEL);
185 if (!name.data) {
186 dprintk("%s: failed to allocate memory for name.data!\n",
187 __func__);
188 return;
189 }
190 name.len = len;
191 crp = nfs4_client_to_reclaim(name, princhash, nn);
192 if (!crp) {
193 kfree(name.data);
194 return;
195 }
196 crp->cr_clp = clp;
197}
198
199static void
200nfsd4_create_clid_dir(struct nfs4_client *clp)
201{
202 const struct cred *original_cred;
203 char dname[HEXDIR_LEN];
204 struct dentry *dir, *dentry;
205 int status;
206 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
207
208 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
209 return;
210 if (!nn->rec_file)
211 return;
212
213 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
214 if (status)
215 return legacy_recdir_name_error(clp, status);
216
217 status = nfs4_save_creds(&original_cred);
218 if (status < 0)
219 return;
220
221 status = mnt_want_write_file(nn->rec_file);
222 if (status)
223 goto out_creds;
224
225 dir = nn->rec_file->f_path.dentry;
226 /* lock the parent */
227 inode_lock(d_inode(dir));
228
229 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
230 if (IS_ERR(dentry)) {
231 status = PTR_ERR(dentry);
232 goto out_unlock;
233 }
234 if (d_really_is_positive(dentry))
235 /*
236 * In the 4.1 case, where we're called from
237 * reclaim_complete(), records from the previous reboot
238 * may still be left, so this is OK.
239 *
240 * In the 4.0 case, we should never get here; but we may
241 * as well be forgiving and just succeed silently.
242 */
243 goto out_put;
244 status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU);
245out_put:
246 dput(dentry);
247out_unlock:
248 inode_unlock(d_inode(dir));
249 if (status == 0) {
250 if (nn->in_grace)
251 __nfsd4_create_reclaim_record_grace(clp, dname,
252 HEXDIR_LEN, nn);
253 vfs_fsync(nn->rec_file, 0);
254 } else {
255 printk(KERN_ERR "NFSD: failed to write recovery record"
256 " (err %d); please check that %s exists"
257 " and is writeable", status,
258 user_recovery_dirname);
259 }
260 mnt_drop_write_file(nn->rec_file);
261out_creds:
262 nfs4_reset_creds(original_cred);
263}
264
265typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
266
267struct name_list {
268 char name[HEXDIR_LEN];
269 struct list_head list;
270};
271
272struct nfs4_dir_ctx {
273 struct dir_context ctx;
274 struct list_head names;
275};
276
277static int
278nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
279 loff_t offset, u64 ino, unsigned int d_type)
280{
281 struct nfs4_dir_ctx *ctx =
282 container_of(__ctx, struct nfs4_dir_ctx, ctx);
283 struct name_list *entry;
284
285 if (namlen != HEXDIR_LEN - 1)
286 return 0;
287 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
288 if (entry == NULL)
289 return -ENOMEM;
290 memcpy(entry->name, name, HEXDIR_LEN - 1);
291 entry->name[HEXDIR_LEN - 1] = '\0';
292 list_add(&entry->list, &ctx->names);
293 return 0;
294}
295
296static int
297nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
298{
299 const struct cred *original_cred;
300 struct dentry *dir = nn->rec_file->f_path.dentry;
301 struct nfs4_dir_ctx ctx = {
302 .ctx.actor = nfsd4_build_namelist,
303 .names = LIST_HEAD_INIT(ctx.names)
304 };
305 struct name_list *entry, *tmp;
306 int status;
307
308 status = nfs4_save_creds(&original_cred);
309 if (status < 0)
310 return status;
311
312 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
313 if (status < 0) {
314 nfs4_reset_creds(original_cred);
315 return status;
316 }
317
318 status = iterate_dir(nn->rec_file, &ctx.ctx);
319 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
320
321 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
322 if (!status) {
323 struct dentry *dentry;
324 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
325 if (IS_ERR(dentry)) {
326 status = PTR_ERR(dentry);
327 break;
328 }
329 status = f(dir, dentry, nn);
330 dput(dentry);
331 }
332 list_del(&entry->list);
333 kfree(entry);
334 }
335 inode_unlock(d_inode(dir));
336 nfs4_reset_creds(original_cred);
337
338 list_for_each_entry_safe(entry, tmp, &ctx.names, list) {
339 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name);
340 list_del(&entry->list);
341 kfree(entry);
342 }
343 return status;
344}
345
346static int
347nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
348{
349 struct dentry *dir, *dentry;
350 int status;
351
352 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
353
354 dir = nn->rec_file->f_path.dentry;
355 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
356 dentry = lookup_one_len(name, dir, namlen);
357 if (IS_ERR(dentry)) {
358 status = PTR_ERR(dentry);
359 goto out_unlock;
360 }
361 status = -ENOENT;
362 if (d_really_is_negative(dentry))
363 goto out;
364 status = vfs_rmdir(d_inode(dir), dentry);
365out:
366 dput(dentry);
367out_unlock:
368 inode_unlock(d_inode(dir));
369 return status;
370}
371
372static void
373__nfsd4_remove_reclaim_record_grace(const char *dname, int len,
374 struct nfsd_net *nn)
375{
376 struct xdr_netobj name;
377 struct nfs4_client_reclaim *crp;
378
379 name.data = kmemdup(dname, len, GFP_KERNEL);
380 if (!name.data) {
381 dprintk("%s: failed to allocate memory for name.data!\n",
382 __func__);
383 return;
384 }
385 name.len = len;
386 crp = nfsd4_find_reclaim_client(name, nn);
387 kfree(name.data);
388 if (crp)
389 nfs4_remove_reclaim_record(crp, nn);
390}
391
392static void
393nfsd4_remove_clid_dir(struct nfs4_client *clp)
394{
395 const struct cred *original_cred;
396 char dname[HEXDIR_LEN];
397 int status;
398 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
399
400 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
401 return;
402
403 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
404 if (status)
405 return legacy_recdir_name_error(clp, status);
406
407 status = mnt_want_write_file(nn->rec_file);
408 if (status)
409 goto out;
410 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
411
412 status = nfs4_save_creds(&original_cred);
413 if (status < 0)
414 goto out_drop_write;
415
416 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
417 nfs4_reset_creds(original_cred);
418 if (status == 0) {
419 vfs_fsync(nn->rec_file, 0);
420 if (nn->in_grace)
421 __nfsd4_remove_reclaim_record_grace(dname,
422 HEXDIR_LEN, nn);
423 }
424out_drop_write:
425 mnt_drop_write_file(nn->rec_file);
426out:
427 if (status)
428 printk("NFSD: Failed to remove expired client state directory"
429 " %.*s\n", HEXDIR_LEN, dname);
430}
431
432static int
433purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
434{
435 int status;
436 struct xdr_netobj name;
437
438 if (child->d_name.len != HEXDIR_LEN - 1) {
439 printk("%s: illegal name %pd in recovery directory\n",
440 __func__, child);
441 /* Keep trying; maybe the others are OK: */
442 return 0;
443 }
444 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
445 if (!name.data) {
446 dprintk("%s: failed to allocate memory for name.data!\n",
447 __func__);
448 goto out;
449 }
450 name.len = HEXDIR_LEN;
451 if (nfs4_has_reclaimed_state(name, nn))
452 goto out_free;
453
454 status = vfs_rmdir(d_inode(parent), child);
455 if (status)
456 printk("failed to remove client recovery directory %pd\n",
457 child);
458out_free:
459 kfree(name.data);
460out:
461 /* Keep trying, success or failure: */
462 return 0;
463}
464
465static void
466nfsd4_recdir_purge_old(struct nfsd_net *nn)
467{
468 int status;
469
470 nn->in_grace = false;
471 if (!nn->rec_file)
472 return;
473 status = mnt_want_write_file(nn->rec_file);
474 if (status)
475 goto out;
476 status = nfsd4_list_rec_dir(purge_old, nn);
477 if (status == 0)
478 vfs_fsync(nn->rec_file, 0);
479 mnt_drop_write_file(nn->rec_file);
480out:
481 nfs4_release_reclaim(nn);
482 if (status)
483 printk("nfsd4: failed to purge old clients from recovery"
484 " directory %pD\n", nn->rec_file);
485}
486
487static int
488load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
489{
490 struct xdr_netobj name;
491 struct xdr_netobj princhash = { .len = 0, .data = NULL };
492
493 if (child->d_name.len != HEXDIR_LEN - 1) {
494 printk("%s: illegal name %pd in recovery directory\n",
495 __func__, child);
496 /* Keep trying; maybe the others are OK: */
497 return 0;
498 }
499 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL);
500 if (!name.data) {
501 dprintk("%s: failed to allocate memory for name.data!\n",
502 __func__);
503 goto out;
504 }
505 name.len = HEXDIR_LEN;
506 if (!nfs4_client_to_reclaim(name, princhash, nn))
507 kfree(name.data);
508out:
509 return 0;
510}
511
512static int
513nfsd4_recdir_load(struct net *net) {
514 int status;
515 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
516
517 if (!nn->rec_file)
518 return 0;
519
520 status = nfsd4_list_rec_dir(load_recdir, nn);
521 if (status)
522 printk("nfsd4: failed loading clients from recovery"
523 " directory %pD\n", nn->rec_file);
524 return status;
525}
526
527/*
528 * Hold reference to the recovery directory.
529 */
530
531static int
532nfsd4_init_recdir(struct net *net)
533{
534 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
535 const struct cred *original_cred;
536 int status;
537
538 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
539 user_recovery_dirname);
540
541 BUG_ON(nn->rec_file);
542
543 status = nfs4_save_creds(&original_cred);
544 if (status < 0) {
545 printk("NFSD: Unable to change credentials to find recovery"
546 " directory: error %d\n",
547 status);
548 return status;
549 }
550
551 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
552 if (IS_ERR(nn->rec_file)) {
553 printk("NFSD: unable to find recovery directory %s\n",
554 user_recovery_dirname);
555 status = PTR_ERR(nn->rec_file);
556 nn->rec_file = NULL;
557 }
558
559 nfs4_reset_creds(original_cred);
560 if (!status)
561 nn->in_grace = true;
562 return status;
563}
564
565static void
566nfsd4_shutdown_recdir(struct net *net)
567{
568 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
569
570 if (!nn->rec_file)
571 return;
572 fput(nn->rec_file);
573 nn->rec_file = NULL;
574}
575
576static int
577nfs4_legacy_state_init(struct net *net)
578{
579 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
580 int i;
581
582 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
583 sizeof(struct list_head),
584 GFP_KERNEL);
585 if (!nn->reclaim_str_hashtbl)
586 return -ENOMEM;
587
588 for (i = 0; i < CLIENT_HASH_SIZE; i++)
589 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
590 nn->reclaim_str_hashtbl_size = 0;
591
592 return 0;
593}
594
595static void
596nfs4_legacy_state_shutdown(struct net *net)
597{
598 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
599
600 kfree(nn->reclaim_str_hashtbl);
601}
602
603static int
604nfsd4_load_reboot_recovery_data(struct net *net)
605{
606 int status;
607
608 status = nfsd4_init_recdir(net);
609 if (status)
610 return status;
611
612 status = nfsd4_recdir_load(net);
613 if (status)
614 nfsd4_shutdown_recdir(net);
615
616 return status;
617}
618
619static int
620nfsd4_legacy_tracking_init(struct net *net)
621{
622 int status;
623
624 /* XXX: The legacy code won't work in a container */
625 if (net != &init_net) {
626 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n");
627 return -EINVAL;
628 }
629
630 status = nfs4_legacy_state_init(net);
631 if (status)
632 return status;
633
634 status = nfsd4_load_reboot_recovery_data(net);
635 if (status)
636 goto err;
637 printk("NFSD: Using legacy client tracking operations.\n");
638 return 0;
639
640err:
641 nfs4_legacy_state_shutdown(net);
642 return status;
643}
644
645static void
646nfsd4_legacy_tracking_exit(struct net *net)
647{
648 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
649
650 nfs4_release_reclaim(nn);
651 nfsd4_shutdown_recdir(net);
652 nfs4_legacy_state_shutdown(net);
653}
654
655/*
656 * Change the NFSv4 recovery directory to recdir.
657 */
658int
659nfs4_reset_recoverydir(char *recdir)
660{
661 int status;
662 struct path path;
663
664 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
665 if (status)
666 return status;
667 status = -ENOTDIR;
668 if (d_is_dir(path.dentry)) {
669 strcpy(user_recovery_dirname, recdir);
670 status = 0;
671 }
672 path_put(&path);
673 return status;
674}
675
676char *
677nfs4_recoverydir(void)
678{
679 return user_recovery_dirname;
680}
681
682static int
683nfsd4_check_legacy_client(struct nfs4_client *clp)
684{
685 int status;
686 char dname[HEXDIR_LEN];
687 struct nfs4_client_reclaim *crp;
688 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
689 struct xdr_netobj name;
690
691 /* did we already find that this client is stable? */
692 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
693 return 0;
694
695 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
696 if (status) {
697 legacy_recdir_name_error(clp, status);
698 return status;
699 }
700
701 /* look for it in the reclaim hashtable otherwise */
702 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
703 if (!name.data) {
704 dprintk("%s: failed to allocate memory for name.data!\n",
705 __func__);
706 goto out_enoent;
707 }
708 name.len = HEXDIR_LEN;
709 crp = nfsd4_find_reclaim_client(name, nn);
710 kfree(name.data);
711 if (crp) {
712 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
713 crp->cr_clp = clp;
714 return 0;
715 }
716
717out_enoent:
718 return -ENOENT;
719}
720
721static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
722 .init = nfsd4_legacy_tracking_init,
723 .exit = nfsd4_legacy_tracking_exit,
724 .create = nfsd4_create_clid_dir,
725 .remove = nfsd4_remove_clid_dir,
726 .check = nfsd4_check_legacy_client,
727 .grace_done = nfsd4_recdir_purge_old,
728 .version = 1,
729 .msglen = 0,
730};
731
732/* Globals */
733#define NFSD_PIPE_DIR "nfsd"
734#define NFSD_CLD_PIPE "cld"
735
736/* per-net-ns structure for holding cld upcall info */
737struct cld_net {
738 struct rpc_pipe *cn_pipe;
739 spinlock_t cn_lock;
740 struct list_head cn_list;
741 unsigned int cn_xid;
742 bool cn_has_legacy;
743 struct crypto_shash *cn_tfm;
744};
745
746struct cld_upcall {
747 struct list_head cu_list;
748 struct cld_net *cu_net;
749 struct completion cu_done;
750 union {
751 struct cld_msg_hdr cu_hdr;
752 struct cld_msg cu_msg;
753 struct cld_msg_v2 cu_msg_v2;
754 } cu_u;
755};
756
757static int
758__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
759{
760 int ret;
761 struct rpc_pipe_msg msg;
762 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u);
763 struct nfsd_net *nn = net_generic(pipe->dentry->d_sb->s_fs_info,
764 nfsd_net_id);
765
766 memset(&msg, 0, sizeof(msg));
767 msg.data = cmsg;
768 msg.len = nn->client_tracking_ops->msglen;
769
770 ret = rpc_queue_upcall(pipe, &msg);
771 if (ret < 0) {
772 goto out;
773 }
774
775 wait_for_completion(&cup->cu_done);
776
777 if (msg.errno < 0)
778 ret = msg.errno;
779out:
780 return ret;
781}
782
783static int
784cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
785{
786 int ret;
787
788 /*
789 * -EAGAIN occurs when pipe is closed and reopened while there are
790 * upcalls queued.
791 */
792 do {
793 ret = __cld_pipe_upcall(pipe, cmsg);
794 } while (ret == -EAGAIN);
795
796 return ret;
797}
798
799static ssize_t
800__cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
801 struct nfsd_net *nn)
802{
803 uint8_t cmd, princhashlen;
804 struct xdr_netobj name, princhash = { .len = 0, .data = NULL };
805 uint16_t namelen;
806 struct cld_net *cn = nn->cld_net;
807
808 if (get_user(cmd, &cmsg->cm_cmd)) {
809 dprintk("%s: error when copying cmd from userspace", __func__);
810 return -EFAULT;
811 }
812 if (cmd == Cld_GraceStart) {
813 if (nn->client_tracking_ops->version >= 2) {
814 const struct cld_clntinfo __user *ci;
815
816 ci = &cmsg->cm_u.cm_clntinfo;
817 if (get_user(namelen, &ci->cc_name.cn_len))
818 return -EFAULT;
819 name.data = memdup_user(&ci->cc_name.cn_id, namelen);
820 if (IS_ERR_OR_NULL(name.data))
821 return -EFAULT;
822 name.len = namelen;
823 get_user(princhashlen, &ci->cc_princhash.cp_len);
824 if (princhashlen > 0) {
825 princhash.data = memdup_user(
826 &ci->cc_princhash.cp_data,
827 princhashlen);
828 if (IS_ERR_OR_NULL(princhash.data))
829 return -EFAULT;
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 name.data = memdup_user(&cnm->cn_id, namelen);
840 if (IS_ERR_OR_NULL(name.data))
841 return -EFAULT;
842 name.len = namelen;
843 }
844 if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) {
845 name.len = name.len - 5;
846 memmove(name.data, name.data + 5, name.len);
847 cn->cn_has_legacy = true;
848 }
849 if (!nfs4_client_to_reclaim(name, princhash, nn)) {
850 kfree(name.data);
851 kfree(princhash.data);
852 return -EFAULT;
853 }
854 return nn->client_tracking_ops->msglen;
855 }
856 return -EFAULT;
857}
858
859static ssize_t
860cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
861{
862 struct cld_upcall *tmp, *cup;
863 struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src;
864 struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src;
865 uint32_t xid;
866 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
867 nfsd_net_id);
868 struct cld_net *cn = nn->cld_net;
869 int16_t status;
870
871 if (mlen != nn->client_tracking_ops->msglen) {
872 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
873 nn->client_tracking_ops->msglen);
874 return -EINVAL;
875 }
876
877 /* copy just the xid so we can try to find that */
878 if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) {
879 dprintk("%s: error when copying xid from userspace", __func__);
880 return -EFAULT;
881 }
882
883 /*
884 * copy the status so we know whether to remove the upcall from the
885 * list (for -EINPROGRESS, we just want to make sure the xid is
886 * valid, not remove the upcall from the list)
887 */
888 if (get_user(status, &hdr->cm_status)) {
889 dprintk("%s: error when copying status from userspace", __func__);
890 return -EFAULT;
891 }
892
893 /* walk the list and find corresponding xid */
894 cup = NULL;
895 spin_lock(&cn->cn_lock);
896 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
897 if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) {
898 cup = tmp;
899 if (status != -EINPROGRESS)
900 list_del_init(&cup->cu_list);
901 break;
902 }
903 }
904 spin_unlock(&cn->cn_lock);
905
906 /* couldn't find upcall? */
907 if (!cup) {
908 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
909 return -EINVAL;
910 }
911
912 if (status == -EINPROGRESS)
913 return __cld_pipe_inprogress_downcall(cmsg, nn);
914
915 if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0)
916 return -EFAULT;
917
918 complete(&cup->cu_done);
919 return mlen;
920}
921
922static void
923cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
924{
925 struct cld_msg *cmsg = msg->data;
926 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
927 cu_u.cu_msg);
928
929 /* errno >= 0 means we got a downcall */
930 if (msg->errno >= 0)
931 return;
932
933 complete(&cup->cu_done);
934}
935
936static const struct rpc_pipe_ops cld_upcall_ops = {
937 .upcall = rpc_pipe_generic_upcall,
938 .downcall = cld_pipe_downcall,
939 .destroy_msg = cld_pipe_destroy_msg,
940};
941
942static struct dentry *
943nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
944{
945 struct dentry *dir, *dentry;
946
947 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
948 if (dir == NULL)
949 return ERR_PTR(-ENOENT);
950 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
951 dput(dir);
952 return dentry;
953}
954
955static void
956nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
957{
958 if (pipe->dentry)
959 rpc_unlink(pipe->dentry);
960}
961
962static struct dentry *
963nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
964{
965 struct super_block *sb;
966 struct dentry *dentry;
967
968 sb = rpc_get_sb_net(net);
969 if (!sb)
970 return NULL;
971 dentry = nfsd4_cld_register_sb(sb, pipe);
972 rpc_put_sb_net(net);
973 return dentry;
974}
975
976static void
977nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
978{
979 struct super_block *sb;
980
981 sb = rpc_get_sb_net(net);
982 if (sb) {
983 nfsd4_cld_unregister_sb(pipe);
984 rpc_put_sb_net(net);
985 }
986}
987
988/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
989static int
990__nfsd4_init_cld_pipe(struct net *net)
991{
992 int ret;
993 struct dentry *dentry;
994 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
995 struct cld_net *cn;
996
997 if (nn->cld_net)
998 return 0;
999
1000 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
1001 if (!cn) {
1002 ret = -ENOMEM;
1003 goto err;
1004 }
1005
1006 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
1007 if (IS_ERR(cn->cn_pipe)) {
1008 ret = PTR_ERR(cn->cn_pipe);
1009 goto err;
1010 }
1011 spin_lock_init(&cn->cn_lock);
1012 INIT_LIST_HEAD(&cn->cn_list);
1013
1014 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
1015 if (IS_ERR(dentry)) {
1016 ret = PTR_ERR(dentry);
1017 goto err_destroy_data;
1018 }
1019
1020 cn->cn_pipe->dentry = dentry;
1021 cn->cn_has_legacy = false;
1022 nn->cld_net = cn;
1023 return 0;
1024
1025err_destroy_data:
1026 rpc_destroy_pipe_data(cn->cn_pipe);
1027err:
1028 kfree(cn);
1029 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
1030 ret);
1031 return ret;
1032}
1033
1034static int
1035nfsd4_init_cld_pipe(struct net *net)
1036{
1037 int status;
1038
1039 status = __nfsd4_init_cld_pipe(net);
1040 if (!status)
1041 printk("NFSD: Using old nfsdcld client tracking operations.\n");
1042 return status;
1043}
1044
1045static void
1046nfsd4_remove_cld_pipe(struct net *net)
1047{
1048 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1049 struct cld_net *cn = nn->cld_net;
1050
1051 nfsd4_cld_unregister_net(net, cn->cn_pipe);
1052 rpc_destroy_pipe_data(cn->cn_pipe);
1053 if (cn->cn_tfm)
1054 crypto_free_shash(cn->cn_tfm);
1055 kfree(nn->cld_net);
1056 nn->cld_net = NULL;
1057}
1058
1059static struct cld_upcall *
1060alloc_cld_upcall(struct nfsd_net *nn)
1061{
1062 struct cld_upcall *new, *tmp;
1063 struct cld_net *cn = nn->cld_net;
1064
1065 new = kzalloc(sizeof(*new), GFP_KERNEL);
1066 if (!new)
1067 return new;
1068
1069 /* FIXME: hard cap on number in flight? */
1070restart_search:
1071 spin_lock(&cn->cn_lock);
1072 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
1073 if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) {
1074 cn->cn_xid++;
1075 spin_unlock(&cn->cn_lock);
1076 goto restart_search;
1077 }
1078 }
1079 init_completion(&new->cu_done);
1080 new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version;
1081 put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid);
1082 new->cu_net = cn;
1083 list_add(&new->cu_list, &cn->cn_list);
1084 spin_unlock(&cn->cn_lock);
1085
1086 dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid);
1087
1088 return new;
1089}
1090
1091static void
1092free_cld_upcall(struct cld_upcall *victim)
1093{
1094 struct cld_net *cn = victim->cu_net;
1095
1096 spin_lock(&cn->cn_lock);
1097 list_del(&victim->cu_list);
1098 spin_unlock(&cn->cn_lock);
1099 kfree(victim);
1100}
1101
1102/* Ask daemon to create a new record */
1103static void
1104nfsd4_cld_create(struct nfs4_client *clp)
1105{
1106 int ret;
1107 struct cld_upcall *cup;
1108 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1109 struct cld_net *cn = nn->cld_net;
1110
1111 /* Don't upcall if it's already stored */
1112 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1113 return;
1114
1115 cup = alloc_cld_upcall(nn);
1116 if (!cup) {
1117 ret = -ENOMEM;
1118 goto out_err;
1119 }
1120
1121 cup->cu_u.cu_msg.cm_cmd = Cld_Create;
1122 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1123 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1124 clp->cl_name.len);
1125
1126 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1127 if (!ret) {
1128 ret = cup->cu_u.cu_msg.cm_status;
1129 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1130 }
1131
1132 free_cld_upcall(cup);
1133out_err:
1134 if (ret)
1135 printk(KERN_ERR "NFSD: Unable to create client "
1136 "record on stable storage: %d\n", ret);
1137}
1138
1139/* Ask daemon to create a new record */
1140static void
1141nfsd4_cld_create_v2(struct nfs4_client *clp)
1142{
1143 int ret;
1144 struct cld_upcall *cup;
1145 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1146 struct cld_net *cn = nn->cld_net;
1147 struct cld_msg_v2 *cmsg;
1148 struct crypto_shash *tfm = cn->cn_tfm;
1149 struct xdr_netobj cksum;
1150 char *principal = NULL;
1151 SHASH_DESC_ON_STACK(desc, tfm);
1152
1153 /* Don't upcall if it's already stored */
1154 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1155 return;
1156
1157 cup = alloc_cld_upcall(nn);
1158 if (!cup) {
1159 ret = -ENOMEM;
1160 goto out_err;
1161 }
1162
1163 cmsg = &cup->cu_u.cu_msg_v2;
1164 cmsg->cm_cmd = Cld_Create;
1165 cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len;
1166 memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data,
1167 clp->cl_name.len);
1168 if (clp->cl_cred.cr_raw_principal)
1169 principal = clp->cl_cred.cr_raw_principal;
1170 else if (clp->cl_cred.cr_principal)
1171 principal = clp->cl_cred.cr_principal;
1172 if (principal) {
1173 desc->tfm = tfm;
1174 cksum.len = crypto_shash_digestsize(tfm);
1175 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1176 if (cksum.data == NULL) {
1177 ret = -ENOMEM;
1178 goto out;
1179 }
1180 ret = crypto_shash_digest(desc, principal, strlen(principal),
1181 cksum.data);
1182 shash_desc_zero(desc);
1183 if (ret) {
1184 kfree(cksum.data);
1185 goto out;
1186 }
1187 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len;
1188 memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
1189 cksum.data, cksum.len);
1190 kfree(cksum.data);
1191 } else
1192 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0;
1193
1194 ret = cld_pipe_upcall(cn->cn_pipe, cmsg);
1195 if (!ret) {
1196 ret = cmsg->cm_status;
1197 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1198 }
1199
1200out:
1201 free_cld_upcall(cup);
1202out_err:
1203 if (ret)
1204 pr_err("NFSD: Unable to create client record on stable storage: %d\n",
1205 ret);
1206}
1207
1208/* Ask daemon to create a new record */
1209static void
1210nfsd4_cld_remove(struct nfs4_client *clp)
1211{
1212 int ret;
1213 struct cld_upcall *cup;
1214 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1215 struct cld_net *cn = nn->cld_net;
1216
1217 /* Don't upcall if it's already removed */
1218 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1219 return;
1220
1221 cup = alloc_cld_upcall(nn);
1222 if (!cup) {
1223 ret = -ENOMEM;
1224 goto out_err;
1225 }
1226
1227 cup->cu_u.cu_msg.cm_cmd = Cld_Remove;
1228 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1229 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1230 clp->cl_name.len);
1231
1232 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1233 if (!ret) {
1234 ret = cup->cu_u.cu_msg.cm_status;
1235 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1236 }
1237
1238 free_cld_upcall(cup);
1239out_err:
1240 if (ret)
1241 printk(KERN_ERR "NFSD: Unable to remove client "
1242 "record from stable storage: %d\n", ret);
1243}
1244
1245/*
1246 * For older nfsdcld's that do not allow us to "slurp" the clients
1247 * from the tracking database during startup.
1248 *
1249 * Check for presence of a record, and update its timestamp
1250 */
1251static int
1252nfsd4_cld_check_v0(struct nfs4_client *clp)
1253{
1254 int ret;
1255 struct cld_upcall *cup;
1256 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1257 struct cld_net *cn = nn->cld_net;
1258
1259 /* Don't upcall if one was already stored during this grace pd */
1260 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1261 return 0;
1262
1263 cup = alloc_cld_upcall(nn);
1264 if (!cup) {
1265 printk(KERN_ERR "NFSD: Unable to check client record on "
1266 "stable storage: %d\n", -ENOMEM);
1267 return -ENOMEM;
1268 }
1269
1270 cup->cu_u.cu_msg.cm_cmd = Cld_Check;
1271 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1272 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1273 clp->cl_name.len);
1274
1275 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1276 if (!ret) {
1277 ret = cup->cu_u.cu_msg.cm_status;
1278 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1279 }
1280
1281 free_cld_upcall(cup);
1282 return ret;
1283}
1284
1285/*
1286 * For newer nfsdcld's that allow us to "slurp" the clients
1287 * from the tracking database during startup.
1288 *
1289 * Check for presence of a record in the reclaim_str_hashtbl
1290 */
1291static int
1292nfsd4_cld_check(struct nfs4_client *clp)
1293{
1294 struct nfs4_client_reclaim *crp;
1295 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1296 struct cld_net *cn = nn->cld_net;
1297 int status;
1298 char dname[HEXDIR_LEN];
1299 struct xdr_netobj name;
1300
1301 /* did we already find that this client is stable? */
1302 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1303 return 0;
1304
1305 /* look for it in the reclaim hashtable otherwise */
1306 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1307 if (crp)
1308 goto found;
1309
1310 if (cn->cn_has_legacy) {
1311 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1312 if (status)
1313 return -ENOENT;
1314
1315 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1316 if (!name.data) {
1317 dprintk("%s: failed to allocate memory for name.data!\n",
1318 __func__);
1319 return -ENOENT;
1320 }
1321 name.len = HEXDIR_LEN;
1322 crp = nfsd4_find_reclaim_client(name, nn);
1323 kfree(name.data);
1324 if (crp)
1325 goto found;
1326
1327 }
1328 return -ENOENT;
1329found:
1330 crp->cr_clp = clp;
1331 return 0;
1332}
1333
1334static int
1335nfsd4_cld_check_v2(struct nfs4_client *clp)
1336{
1337 struct nfs4_client_reclaim *crp;
1338 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1339 struct cld_net *cn = nn->cld_net;
1340 int status;
1341 char dname[HEXDIR_LEN];
1342 struct xdr_netobj name;
1343 struct crypto_shash *tfm = cn->cn_tfm;
1344 struct xdr_netobj cksum;
1345 char *principal = NULL;
1346 SHASH_DESC_ON_STACK(desc, tfm);
1347
1348 /* did we already find that this client is stable? */
1349 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1350 return 0;
1351
1352 /* look for it in the reclaim hashtable otherwise */
1353 crp = nfsd4_find_reclaim_client(clp->cl_name, nn);
1354 if (crp)
1355 goto found;
1356
1357 if (cn->cn_has_legacy) {
1358 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
1359 if (status)
1360 return -ENOENT;
1361
1362 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL);
1363 if (!name.data) {
1364 dprintk("%s: failed to allocate memory for name.data\n",
1365 __func__);
1366 return -ENOENT;
1367 }
1368 name.len = HEXDIR_LEN;
1369 crp = nfsd4_find_reclaim_client(name, nn);
1370 kfree(name.data);
1371 if (crp)
1372 goto found;
1373
1374 }
1375 return -ENOENT;
1376found:
1377 if (crp->cr_princhash.len) {
1378 if (clp->cl_cred.cr_raw_principal)
1379 principal = clp->cl_cred.cr_raw_principal;
1380 else if (clp->cl_cred.cr_principal)
1381 principal = clp->cl_cred.cr_principal;
1382 if (principal == NULL)
1383 return -ENOENT;
1384 desc->tfm = tfm;
1385 cksum.len = crypto_shash_digestsize(tfm);
1386 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
1387 if (cksum.data == NULL)
1388 return -ENOENT;
1389 status = crypto_shash_digest(desc, principal, strlen(principal),
1390 cksum.data);
1391 shash_desc_zero(desc);
1392 if (status) {
1393 kfree(cksum.data);
1394 return -ENOENT;
1395 }
1396 if (memcmp(crp->cr_princhash.data, cksum.data,
1397 crp->cr_princhash.len)) {
1398 kfree(cksum.data);
1399 return -ENOENT;
1400 }
1401 kfree(cksum.data);
1402 }
1403 crp->cr_clp = clp;
1404 return 0;
1405}
1406
1407static int
1408nfsd4_cld_grace_start(struct nfsd_net *nn)
1409{
1410 int ret;
1411 struct cld_upcall *cup;
1412 struct cld_net *cn = nn->cld_net;
1413
1414 cup = alloc_cld_upcall(nn);
1415 if (!cup) {
1416 ret = -ENOMEM;
1417 goto out_err;
1418 }
1419
1420 cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart;
1421 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1422 if (!ret)
1423 ret = cup->cu_u.cu_msg.cm_status;
1424
1425 free_cld_upcall(cup);
1426out_err:
1427 if (ret)
1428 dprintk("%s: Unable to get clients from userspace: %d\n",
1429 __func__, ret);
1430 return ret;
1431}
1432
1433/* For older nfsdcld's that need cm_gracetime */
1434static void
1435nfsd4_cld_grace_done_v0(struct nfsd_net *nn)
1436{
1437 int ret;
1438 struct cld_upcall *cup;
1439 struct cld_net *cn = nn->cld_net;
1440
1441 cup = alloc_cld_upcall(nn);
1442 if (!cup) {
1443 ret = -ENOMEM;
1444 goto out_err;
1445 }
1446
1447 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1448 cup->cu_u.cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time;
1449 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1450 if (!ret)
1451 ret = cup->cu_u.cu_msg.cm_status;
1452
1453 free_cld_upcall(cup);
1454out_err:
1455 if (ret)
1456 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1457}
1458
1459/*
1460 * For newer nfsdcld's that do not need cm_gracetime. We also need to call
1461 * nfs4_release_reclaim() to clear out the reclaim_str_hashtbl.
1462 */
1463static void
1464nfsd4_cld_grace_done(struct nfsd_net *nn)
1465{
1466 int ret;
1467 struct cld_upcall *cup;
1468 struct cld_net *cn = nn->cld_net;
1469
1470 cup = alloc_cld_upcall(nn);
1471 if (!cup) {
1472 ret = -ENOMEM;
1473 goto out_err;
1474 }
1475
1476 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
1477 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1478 if (!ret)
1479 ret = cup->cu_u.cu_msg.cm_status;
1480
1481 free_cld_upcall(cup);
1482out_err:
1483 nfs4_release_reclaim(nn);
1484 if (ret)
1485 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1486}
1487
1488static int
1489nfs4_cld_state_init(struct net *net)
1490{
1491 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1492 int i;
1493
1494 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
1495 sizeof(struct list_head),
1496 GFP_KERNEL);
1497 if (!nn->reclaim_str_hashtbl)
1498 return -ENOMEM;
1499
1500 for (i = 0; i < CLIENT_HASH_SIZE; i++)
1501 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
1502 nn->reclaim_str_hashtbl_size = 0;
1503 nn->track_reclaim_completes = true;
1504 atomic_set(&nn->nr_reclaim_complete, 0);
1505
1506 return 0;
1507}
1508
1509static void
1510nfs4_cld_state_shutdown(struct net *net)
1511{
1512 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1513
1514 nn->track_reclaim_completes = false;
1515 kfree(nn->reclaim_str_hashtbl);
1516}
1517
1518static bool
1519cld_running(struct nfsd_net *nn)
1520{
1521 struct cld_net *cn = nn->cld_net;
1522 struct rpc_pipe *pipe = cn->cn_pipe;
1523
1524 return pipe->nreaders || pipe->nwriters;
1525}
1526
1527static int
1528nfsd4_cld_get_version(struct nfsd_net *nn)
1529{
1530 int ret = 0;
1531 struct cld_upcall *cup;
1532 struct cld_net *cn = nn->cld_net;
1533 uint8_t version;
1534
1535 cup = alloc_cld_upcall(nn);
1536 if (!cup) {
1537 ret = -ENOMEM;
1538 goto out_err;
1539 }
1540 cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion;
1541 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
1542 if (!ret) {
1543 ret = cup->cu_u.cu_msg.cm_status;
1544 if (ret)
1545 goto out_free;
1546 version = cup->cu_u.cu_msg.cm_u.cm_version;
1547 dprintk("%s: userspace returned version %u\n",
1548 __func__, version);
1549 if (version < 1)
1550 version = 1;
1551 else if (version > CLD_UPCALL_VERSION)
1552 version = CLD_UPCALL_VERSION;
1553
1554 switch (version) {
1555 case 1:
1556 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
1557 break;
1558 case 2:
1559 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2;
1560 break;
1561 default:
1562 break;
1563 }
1564 }
1565out_free:
1566 free_cld_upcall(cup);
1567out_err:
1568 if (ret)
1569 dprintk("%s: Unable to get version from userspace: %d\n",
1570 __func__, ret);
1571 return ret;
1572}
1573
1574static int
1575nfsd4_cld_tracking_init(struct net *net)
1576{
1577 int status;
1578 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1579 bool running;
1580 int retries = 10;
1581
1582 status = nfs4_cld_state_init(net);
1583 if (status)
1584 return status;
1585
1586 status = __nfsd4_init_cld_pipe(net);
1587 if (status)
1588 goto err_shutdown;
1589 nn->cld_net->cn_tfm = crypto_alloc_shash("sha256", 0, 0);
1590 if (IS_ERR(nn->cld_net->cn_tfm)) {
1591 status = PTR_ERR(nn->cld_net->cn_tfm);
1592 goto err_remove;
1593 }
1594
1595 /*
1596 * rpc pipe upcalls take 30 seconds to time out, so we don't want to
1597 * queue an upcall unless we know that nfsdcld is running (because we
1598 * want this to fail fast so that nfsd4_client_tracking_init() can try
1599 * the next client tracking method). nfsdcld should already be running
1600 * before nfsd is started, so the wait here is for nfsdcld to open the
1601 * pipefs file we just created.
1602 */
1603 while (!(running = cld_running(nn)) && retries--)
1604 msleep(100);
1605
1606 if (!running) {
1607 status = -ETIMEDOUT;
1608 goto err_remove;
1609 }
1610
1611 status = nfsd4_cld_get_version(nn);
1612 if (status == -EOPNOTSUPP)
1613 pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n");
1614
1615 status = nfsd4_cld_grace_start(nn);
1616 if (status) {
1617 if (status == -EOPNOTSUPP)
1618 pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n");
1619 nfs4_release_reclaim(nn);
1620 goto err_remove;
1621 } else
1622 printk("NFSD: Using nfsdcld client tracking operations.\n");
1623 return 0;
1624
1625err_remove:
1626 nfsd4_remove_cld_pipe(net);
1627err_shutdown:
1628 nfs4_cld_state_shutdown(net);
1629 return status;
1630}
1631
1632static void
1633nfsd4_cld_tracking_exit(struct net *net)
1634{
1635 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1636
1637 nfs4_release_reclaim(nn);
1638 nfsd4_remove_cld_pipe(net);
1639 nfs4_cld_state_shutdown(net);
1640}
1641
1642/* For older nfsdcld's */
1643static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = {
1644 .init = nfsd4_init_cld_pipe,
1645 .exit = nfsd4_remove_cld_pipe,
1646 .create = nfsd4_cld_create,
1647 .remove = nfsd4_cld_remove,
1648 .check = nfsd4_cld_check_v0,
1649 .grace_done = nfsd4_cld_grace_done_v0,
1650 .version = 1,
1651 .msglen = sizeof(struct cld_msg),
1652};
1653
1654/* For newer nfsdcld's */
1655static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1656 .init = nfsd4_cld_tracking_init,
1657 .exit = nfsd4_cld_tracking_exit,
1658 .create = nfsd4_cld_create,
1659 .remove = nfsd4_cld_remove,
1660 .check = nfsd4_cld_check,
1661 .grace_done = nfsd4_cld_grace_done,
1662 .version = 1,
1663 .msglen = sizeof(struct cld_msg),
1664};
1665
1666/* v2 create/check ops include the principal, if available */
1667static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = {
1668 .init = nfsd4_cld_tracking_init,
1669 .exit = nfsd4_cld_tracking_exit,
1670 .create = nfsd4_cld_create_v2,
1671 .remove = nfsd4_cld_remove,
1672 .check = nfsd4_cld_check_v2,
1673 .grace_done = nfsd4_cld_grace_done,
1674 .version = 2,
1675 .msglen = sizeof(struct cld_msg_v2),
1676};
1677
1678/* upcall via usermodehelper */
1679static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1680module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1681 S_IRUGO|S_IWUSR);
1682MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1683
1684static bool cltrack_legacy_disable;
1685module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1686MODULE_PARM_DESC(cltrack_legacy_disable,
1687 "Disable legacy recoverydir conversion. Default: false");
1688
1689#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1690#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1691#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1692#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
1693
1694static char *
1695nfsd4_cltrack_legacy_topdir(void)
1696{
1697 int copied;
1698 size_t len;
1699 char *result;
1700
1701 if (cltrack_legacy_disable)
1702 return NULL;
1703
1704 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1705 strlen(nfs4_recoverydir()) + 1;
1706
1707 result = kmalloc(len, GFP_KERNEL);
1708 if (!result)
1709 return result;
1710
1711 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1712 nfs4_recoverydir());
1713 if (copied >= len) {
1714 /* just return nothing if output was truncated */
1715 kfree(result);
1716 return NULL;
1717 }
1718
1719 return result;
1720}
1721
1722static char *
1723nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
1724{
1725 int copied;
1726 size_t len;
1727 char *result;
1728
1729 if (cltrack_legacy_disable)
1730 return NULL;
1731
1732 /* +1 is for '/' between "topdir" and "recdir" */
1733 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1734 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1735
1736 result = kmalloc(len, GFP_KERNEL);
1737 if (!result)
1738 return result;
1739
1740 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1741 nfs4_recoverydir());
1742 if (copied > (len - HEXDIR_LEN)) {
1743 /* just return nothing if output will be truncated */
1744 kfree(result);
1745 return NULL;
1746 }
1747
1748 copied = nfs4_make_rec_clidname(result + copied, name);
1749 if (copied) {
1750 kfree(result);
1751 return NULL;
1752 }
1753
1754 return result;
1755}
1756
1757static char *
1758nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
1759{
1760 int copied;
1761 size_t len;
1762 char *result;
1763
1764 /* prefix + Y/N character + terminating NULL */
1765 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1766
1767 result = kmalloc(len, GFP_KERNEL);
1768 if (!result)
1769 return result;
1770
1771 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1772 clp->cl_minorversion ? 'Y' : 'N');
1773 if (copied >= len) {
1774 /* just return nothing if output was truncated */
1775 kfree(result);
1776 return NULL;
1777 }
1778
1779 return result;
1780}
1781
1782static char *
1783nfsd4_cltrack_grace_start(time_t grace_start)
1784{
1785 int copied;
1786 size_t len;
1787 char *result;
1788
1789 /* prefix + max width of int64_t string + terminating NULL */
1790 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1791
1792 result = kmalloc(len, GFP_KERNEL);
1793 if (!result)
1794 return result;
1795
1796 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld",
1797 grace_start);
1798 if (copied >= len) {
1799 /* just return nothing if output was truncated */
1800 kfree(result);
1801 return NULL;
1802 }
1803
1804 return result;
1805}
1806
1807static int
1808nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1809{
1810 char *envp[3];
1811 char *argv[4];
1812 int ret;
1813
1814 if (unlikely(!cltrack_prog[0])) {
1815 dprintk("%s: cltrack_prog is disabled\n", __func__);
1816 return -EACCES;
1817 }
1818
1819 dprintk("%s: cmd: %s\n", __func__, cmd);
1820 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
1821 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1822 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
1823
1824 envp[0] = env0;
1825 envp[1] = env1;
1826 envp[2] = NULL;
1827
1828 argv[0] = (char *)cltrack_prog;
1829 argv[1] = cmd;
1830 argv[2] = arg;
1831 argv[3] = NULL;
1832
1833 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1834 /*
1835 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1836 * error. The admin can re-enable it on the fly by using sysfs
1837 * once the problem has been fixed.
1838 */
1839 if (ret == -ENOENT || ret == -EACCES) {
1840 dprintk("NFSD: %s was not found or isn't executable (%d). "
1841 "Setting cltrack_prog to blank string!",
1842 cltrack_prog, ret);
1843 cltrack_prog[0] = '\0';
1844 }
1845 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1846
1847 return ret;
1848}
1849
1850static char *
1851bin_to_hex_dup(const unsigned char *src, int srclen)
1852{
1853 int i;
1854 char *buf, *hex;
1855
1856 /* +1 for terminating NULL */
1857 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1858 if (!buf)
1859 return buf;
1860
1861 hex = buf;
1862 for (i = 0; i < srclen; i++) {
1863 sprintf(hex, "%2.2x", *src++);
1864 hex += 2;
1865 }
1866 return buf;
1867}
1868
1869static int
1870nfsd4_umh_cltrack_init(struct net *net)
1871{
1872 int ret;
1873 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1874 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1875
1876 /* XXX: The usermode helper s not working in container yet. */
1877 if (net != &init_net) {
1878 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n");
1879 kfree(grace_start);
1880 return -EINVAL;
1881 }
1882
1883 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1884 kfree(grace_start);
1885 if (!ret)
1886 printk("NFSD: Using UMH upcall client tracking operations.\n");
1887 return ret;
1888}
1889
1890static void
1891nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1892{
1893 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1894 TASK_UNINTERRUPTIBLE);
1895}
1896
1897static void
1898nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1899{
1900 smp_mb__before_atomic();
1901 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1902 smp_mb__after_atomic();
1903 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
1904}
1905
1906static void
1907nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1908{
1909 char *hexid, *has_session, *grace_start;
1910 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1911
1912 /*
1913 * With v4.0 clients, there's little difference in outcome between a
1914 * create and check operation, and we can end up calling into this
1915 * function multiple times per client (once for each openowner). So,
1916 * for v4.0 clients skip upcalling once the client has been recorded
1917 * on stable storage.
1918 *
1919 * For v4.1+ clients, the outcome of the two operations is different,
1920 * so we must ensure that we upcall for the create operation. v4.1+
1921 * clients call this on RECLAIM_COMPLETE though, so we should only end
1922 * up doing a single create upcall per client.
1923 */
1924 if (clp->cl_minorversion == 0 &&
1925 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1926 return;
1927
1928 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1929 if (!hexid) {
1930 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1931 return;
1932 }
1933
1934 has_session = nfsd4_cltrack_client_has_session(clp);
1935 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1936
1937 nfsd4_cltrack_upcall_lock(clp);
1938 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1939 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1940 nfsd4_cltrack_upcall_unlock(clp);
1941
1942 kfree(has_session);
1943 kfree(grace_start);
1944 kfree(hexid);
1945}
1946
1947static void
1948nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1949{
1950 char *hexid;
1951
1952 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1953 return;
1954
1955 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1956 if (!hexid) {
1957 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1958 return;
1959 }
1960
1961 nfsd4_cltrack_upcall_lock(clp);
1962 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1963 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1964 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1965 nfsd4_cltrack_upcall_unlock(clp);
1966
1967 kfree(hexid);
1968}
1969
1970static int
1971nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1972{
1973 int ret;
1974 char *hexid, *has_session, *legacy;
1975
1976 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1977 return 0;
1978
1979 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1980 if (!hexid) {
1981 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1982 return -ENOMEM;
1983 }
1984
1985 has_session = nfsd4_cltrack_client_has_session(clp);
1986 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
1987
1988 nfsd4_cltrack_upcall_lock(clp);
1989 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1990 ret = 0;
1991 } else {
1992 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1993 if (ret == 0)
1994 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1995 }
1996 nfsd4_cltrack_upcall_unlock(clp);
1997 kfree(has_session);
1998 kfree(legacy);
1999 kfree(hexid);
2000
2001 return ret;
2002}
2003
2004static void
2005nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
2006{
2007 char *legacy;
2008 char timestr[22]; /* FIXME: better way to determine max size? */
2009
2010 sprintf(timestr, "%ld", nn->boot_time);
2011 legacy = nfsd4_cltrack_legacy_topdir();
2012 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
2013 kfree(legacy);
2014}
2015
2016static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
2017 .init = nfsd4_umh_cltrack_init,
2018 .exit = NULL,
2019 .create = nfsd4_umh_cltrack_create,
2020 .remove = nfsd4_umh_cltrack_remove,
2021 .check = nfsd4_umh_cltrack_check,
2022 .grace_done = nfsd4_umh_cltrack_grace_done,
2023 .version = 1,
2024 .msglen = 0,
2025};
2026
2027int
2028nfsd4_client_tracking_init(struct net *net)
2029{
2030 int status;
2031 struct path path;
2032 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2033
2034 /* just run the init if it the method is already decided */
2035 if (nn->client_tracking_ops)
2036 goto do_init;
2037
2038 /* First, try to use nfsdcld */
2039 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
2040 status = nn->client_tracking_ops->init(net);
2041 if (!status)
2042 return status;
2043 if (status != -ETIMEDOUT) {
2044 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0;
2045 status = nn->client_tracking_ops->init(net);
2046 if (!status)
2047 return status;
2048 }
2049
2050 /*
2051 * Next, try the UMH upcall.
2052 */
2053 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
2054 status = nn->client_tracking_ops->init(net);
2055 if (!status)
2056 return status;
2057
2058 /*
2059 * Finally, See if the recoverydir exists and is a directory.
2060 * If it is, then use the legacy ops.
2061 */
2062 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
2063 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
2064 if (!status) {
2065 status = d_is_dir(path.dentry);
2066 path_put(&path);
2067 if (!status) {
2068 status = -EINVAL;
2069 goto out;
2070 }
2071 }
2072
2073do_init:
2074 status = nn->client_tracking_ops->init(net);
2075out:
2076 if (status) {
2077 printk(KERN_WARNING "NFSD: Unable to initialize client "
2078 "recovery tracking! (%d)\n", status);
2079 nn->client_tracking_ops = NULL;
2080 }
2081 return status;
2082}
2083
2084void
2085nfsd4_client_tracking_exit(struct net *net)
2086{
2087 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2088
2089 if (nn->client_tracking_ops) {
2090 if (nn->client_tracking_ops->exit)
2091 nn->client_tracking_ops->exit(net);
2092 nn->client_tracking_ops = NULL;
2093 }
2094}
2095
2096void
2097nfsd4_client_record_create(struct nfs4_client *clp)
2098{
2099 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2100
2101 if (nn->client_tracking_ops)
2102 nn->client_tracking_ops->create(clp);
2103}
2104
2105void
2106nfsd4_client_record_remove(struct nfs4_client *clp)
2107{
2108 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2109
2110 if (nn->client_tracking_ops)
2111 nn->client_tracking_ops->remove(clp);
2112}
2113
2114int
2115nfsd4_client_record_check(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 return nn->client_tracking_ops->check(clp);
2121
2122 return -EOPNOTSUPP;
2123}
2124
2125void
2126nfsd4_record_grace_done(struct nfsd_net *nn)
2127{
2128 if (nn->client_tracking_ops)
2129 nn->client_tracking_ops->grace_done(nn);
2130}
2131
2132static int
2133rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
2134{
2135 struct super_block *sb = ptr;
2136 struct net *net = sb->s_fs_info;
2137 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2138 struct cld_net *cn = nn->cld_net;
2139 struct dentry *dentry;
2140 int ret = 0;
2141
2142 if (!try_module_get(THIS_MODULE))
2143 return 0;
2144
2145 if (!cn) {
2146 module_put(THIS_MODULE);
2147 return 0;
2148 }
2149
2150 switch (event) {
2151 case RPC_PIPEFS_MOUNT:
2152 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
2153 if (IS_ERR(dentry)) {
2154 ret = PTR_ERR(dentry);
2155 break;
2156 }
2157 cn->cn_pipe->dentry = dentry;
2158 break;
2159 case RPC_PIPEFS_UMOUNT:
2160 if (cn->cn_pipe->dentry)
2161 nfsd4_cld_unregister_sb(cn->cn_pipe);
2162 break;
2163 default:
2164 ret = -ENOTSUPP;
2165 break;
2166 }
2167 module_put(THIS_MODULE);
2168 return ret;
2169}
2170
2171static struct notifier_block nfsd4_cld_block = {
2172 .notifier_call = rpc_pipefs_event,
2173};
2174
2175int
2176register_cld_notifier(void)
2177{
2178 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
2179}
2180
2181void
2182unregister_cld_notifier(void)
2183{
2184 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
2185}