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knfsd: add file to export stats about nfsd pools
[mirror_ubuntu-zesty-kernel.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4 80
8b671b80
BF		 81/* Locking: */
82
83/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 84static DEFINE_MUTEX(client_mutex);
1da177e4 85
8b671b80
BF		 86/*
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
90 */
91static DEFINE_SPINLOCK(recall_lock);
92
e18b890b
CL		 93static struct kmem_cache *stateowner_slab = NULL;
94static struct kmem_cache *file_slab = NULL;
95static struct kmem_cache *stateid_slab = NULL;
96static struct kmem_cache *deleg_slab = NULL;
e60d4398 97
1da177e4
LT		 98void
99nfs4_lock_state(void)
100{
353ab6e9 101 mutex_lock(&client_mutex);
1da177e4
LT		 102}
103
104void
105nfs4_unlock_state(void)
106{
353ab6e9 107 mutex_unlock(&client_mutex);
1da177e4
LT		 108}
109
110static inline u32
111opaque_hashval(const void *ptr, int nbytes)
112{
113 unsigned char *cptr = (unsigned char *) ptr;
114
115 u32 x = 0;
116 while (nbytes--) {
117 x *= 37;
118 x += *cptr++;
119 }
120 return x;
121}
122
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static inline void
126put_nfs4_file(struct nfs4_file *fi)
127{
8b671b80
BF		 128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
129 list_del(&fi->fi_hash);
130 spin_unlock(&recall_lock);
131 iput(fi->fi_inode);
132 kmem_cache_free(file_slab, fi);
133 }
13cd2184
N		 134}
135
136static inline void
137get_nfs4_file(struct nfs4_file *fi)
138{
8b671b80 139 atomic_inc(&fi->fi_ref);
13cd2184
N		 140}
141
ef0f3390 142static int num_delegations;
c2f1a551 143unsigned int max_delegations;
ef0f3390
N		 144
145/*
146 * Open owner state (share locks)
147 */
148
149/* hash tables for nfs4_stateowner */
150#define OWNER_HASH_BITS 8
151#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
152#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
153
154#define ownerid_hashval(id) \
155 ((id) & OWNER_HASH_MASK)
156#define ownerstr_hashval(clientid, ownername) \
157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
158
159static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
160static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
161
162/* hash table for nfs4_file */
163#define FILE_HASH_BITS 8
164#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
165#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
166/* hash table for (open)nfs4_stateid */
167#define STATEID_HASH_BITS 10
168#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
169#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
170
171#define file_hashval(x) \
172 hash_ptr(x, FILE_HASH_BITS)
173#define stateid_hashval(owner_id, file_id) \
174 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
175
176static struct list_head file_hashtbl[FILE_HASH_SIZE];
177static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
178
1da177e4
LT		 179static struct nfs4_delegation *
180alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
181{
182 struct nfs4_delegation *dp;
183 struct nfs4_file *fp = stp->st_file;
184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
185
186 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 187 if (fp->fi_had_conflict)
188 return NULL;
c2f1a551 189 if (num_delegations > max_delegations)
ef0f3390 190 return NULL;
5b2d21c1
N		 191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
192 if (dp == NULL)
1da177e4 193 return dp;
ef0f3390 194 num_delegations++;
ea1da636
N		 195 INIT_LIST_HEAD(&dp->dl_perfile);
196 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 197 INIT_LIST_HEAD(&dp->dl_recall_lru);
198 dp->dl_client = clp;
13cd2184 199 get_nfs4_file(fp);
1da177e4
LT		 200 dp->dl_file = fp;
201 dp->dl_flock = NULL;
202 get_file(stp->st_vfs_file);
203 dp->dl_vfs_file = stp->st_vfs_file;
204 dp->dl_type = type;
205 dp->dl_recall.cbr_dp = NULL;
206 dp->dl_recall.cbr_ident = cb->cb_ident;
207 dp->dl_recall.cbr_trunc = 0;
208 dp->dl_stateid.si_boot = boot_time;
209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
6c02eaa1 212 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 213 dp->dl_time = 0;
214 atomic_set(&dp->dl_count, 1);
ea1da636
N		 215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 217 return dp;
218}
219
220void
221nfs4_put_delegation(struct nfs4_delegation *dp)
222{
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 225 put_nfs4_file(dp->dl_file);
5b2d21c1 226 kmem_cache_free(deleg_slab, dp);
ef0f3390 227 num_delegations--;
1da177e4
LT		 228 }
229}
230
231/* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
235 */
236static void
237nfs4_close_delegation(struct nfs4_delegation *dp)
238{
239 struct file *filp = dp->dl_vfs_file;
240
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
c907132d 245 if (dp->dl_flock)
a9933cea 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 247 nfsd_close(filp);
1da177e4
LT		 248}
249
250/* Called under the state lock. */
251static void
252unhash_delegation(struct nfs4_delegation *dp)
253{
ea1da636
N		 254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
261}
262
263/*
264 * SETCLIENTID state
265 */
266
267/* Hash tables for nfs4_clientid state */
268#define CLIENT_HASH_BITS 4
269#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
271
272#define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 274#define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 276/*
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
279 *
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
282 *
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
284 * setclientid info.
285 *
286 * client_lru holds client queue ordered by nfs4_client.cl_time
287 * for lease renewal.
288 *
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
291 */
292static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293static int reclaim_str_hashtbl_size = 0;
294static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head client_lru;
299static struct list_head close_lru;
300
2283963f
BF		 301static void unhash_generic_stateid(struct nfs4_stateid *stp)
302{
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
306}
307
308static void free_generic_stateid(struct nfs4_stateid *stp)
309{
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
312}
313
314static void release_lock_stateid(struct nfs4_stateid *stp)
315{
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
319}
320
f044ff83
BF		 321static void unhash_lockowner(struct nfs4_stateowner *sop)
322{
323 struct nfs4_stateid *stp;
324
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
332 }
333}
334
335static void release_lockowner(struct nfs4_stateowner *sop)
336{
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
339}
340
f1d110ca
BF		 341static void
342release_stateid_lockowners(struct nfs4_stateid *open_stp)
343{
344 struct nfs4_stateowner *lock_sop;
345
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 351 release_lockowner(lock_sop);
f1d110ca
BF		 352 }
353}
354
2283963f
BF		 355static void release_open_stateid(struct nfs4_stateid *stp)
356{
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
361}
362
f044ff83 363static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 364{
365 struct nfs4_stateid *stp;
366
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
f044ff83
BF		 369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 371 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
f1d110ca
BF		 375 }
376}
377
f044ff83 378static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 379{
f044ff83 380 unhash_openowner(sop);
f1d110ca
BF		 381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
383}
384
1da177e4
LT		 385static inline void
386renew_client(struct nfs4_client *clp)
387{
388 /*
389 * Move client to the end to the LRU list.
390 */
391 dprintk("renewing client (clientid %08x/%08x)\n",
392 clp->cl_clientid.cl_boot,
393 clp->cl_clientid.cl_id);
394 list_move_tail(&clp->cl_lru, &client_lru);
395 clp->cl_time = get_seconds();
396}
397
398/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
399static int
400STALE_CLIENTID(clientid_t *clid)
401{
402 if (clid->cl_boot == boot_time)
403 return 0;
404 dprintk("NFSD stale clientid (%08x/%08x)\n",
405 clid->cl_boot, clid->cl_id);
406 return 1;
407}
408
409/*
410 * XXX Should we use a slab cache ?
411 * This type of memory management is somewhat inefficient, but we use it
412 * anyway since SETCLIENTID is not a common operation.
413 */
35bba9a3 414static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 415{
416 struct nfs4_client *clp;
417
35bba9a3
BF		 418 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
419 if (clp == NULL)
420 return NULL;
421 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
422 if (clp->cl_name.data == NULL) {
423 kfree(clp);
424 return NULL;
1da177e4 425 }
35bba9a3
BF		 426 memcpy(clp->cl_name.data, name.data, name.len);
427 clp->cl_name.len = name.len;
1da177e4
LT		 428 return clp;
429}
430
1b1a9b31
BF		 431static void
432shutdown_callback_client(struct nfs4_client *clp)
433{
434 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
435
1b1a9b31 436 if (clnt) {
404ec117
BF		 437 /*
438 * Callback threads take a reference on the client, so there
439 * should be no outstanding callbacks at this point.
440 */
1b1a9b31
BF		 441 clp->cl_callback.cb_client = NULL;
442 rpc_shutdown_client(clnt);
443 }
444}
445
1da177e4
LT		 446static inline void
447free_client(struct nfs4_client *clp)
448{
1b1a9b31 449 shutdown_callback_client(clp);
1da177e4
LT		 450 if (clp->cl_cred.cr_group_info)
451 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 452 kfree(clp->cl_principal);
1da177e4
LT		 453 kfree(clp->cl_name.data);
454 kfree(clp);
455}
456
457void
458put_nfs4_client(struct nfs4_client *clp)
459{
460 if (atomic_dec_and_test(&clp->cl_count))
461 free_client(clp);
462}
463
464static void
465expire_client(struct nfs4_client *clp)
466{
467 struct nfs4_stateowner *sop;
468 struct nfs4_delegation *dp;
1da177e4
LT		 469 struct list_head reaplist;
470
471 dprintk("NFSD: expire_client cl_count %d\n",
472 atomic_read(&clp->cl_count));
473
1da177e4
LT		 474 INIT_LIST_HEAD(&reaplist);
475 spin_lock(&recall_lock);
ea1da636
N		 476 while (!list_empty(&clp->cl_delegations)) {
477 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 478 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
479 dp->dl_flock);
ea1da636 480 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 481 list_move(&dp->dl_recall_lru, &reaplist);
482 }
483 spin_unlock(&recall_lock);
484 while (!list_empty(&reaplist)) {
485 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
486 list_del_init(&dp->dl_recall_lru);
487 unhash_delegation(dp);
488 }
489 list_del(&clp->cl_idhash);
490 list_del(&clp->cl_strhash);
491 list_del(&clp->cl_lru);
ea1da636
N		 492 while (!list_empty(&clp->cl_openowners)) {
493 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 494 release_openowner(sop);
1da177e4
LT		 495 }
496 put_nfs4_client(clp);
497}
498
35bba9a3
BF		 499static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
500{
1da177e4
LT		 501 struct nfs4_client *clp;
502
35bba9a3
BF		 503 clp = alloc_client(name);
504 if (clp == NULL)
505 return NULL;
a55370a3 506 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 507 atomic_set(&clp->cl_count, 1);
508 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 509 INIT_LIST_HEAD(&clp->cl_idhash);
510 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 511 INIT_LIST_HEAD(&clp->cl_openowners);
512 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 513 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 514 return clp;
515}
516
35bba9a3
BF		 517static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
518{
519 memcpy(target->cl_verifier.data, source->data,
520 sizeof(target->cl_verifier.data));
1da177e4
LT		 521}
522
35bba9a3
BF		 523static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
524{
1da177e4
LT		 525 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
526 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
527}
528
35bba9a3
BF		 529static void copy_cred(struct svc_cred *target, struct svc_cred *source)
530{
1da177e4
LT		 531 target->cr_uid = source->cr_uid;
532 target->cr_gid = source->cr_gid;
533 target->cr_group_info = source->cr_group_info;
534 get_group_info(target->cr_group_info);
535}
536
35bba9a3 537static int same_name(const char *n1, const char *n2)
599e0a22 538{
a55370a3 539 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 540}
541
542static int
599e0a22
BF		 543same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
544{
545 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 546}
547
548static int
599e0a22
BF		 549same_clid(clientid_t *cl1, clientid_t *cl2)
550{
551 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 552}
553
554/* XXX what about NGROUP */
555static int
599e0a22
BF		 556same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
557{
558 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 559}
560
5ec7b46c
BF		 561static void gen_clid(struct nfs4_client *clp)
562{
563 static u32 current_clientid = 1;
564
1da177e4
LT		 565 clp->cl_clientid.cl_boot = boot_time;
566 clp->cl_clientid.cl_id = current_clientid++;
567}
568
deda2faa
BF		 569static void gen_confirm(struct nfs4_client *clp)
570{
571 static u32 i;
572 u32 *p;
1da177e4 573
1da177e4 574 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 575 *p++ = get_seconds();
576 *p++ = i++;
1da177e4
LT		 577}
578
35bba9a3
BF		 579static int check_name(struct xdr_netobj name)
580{
1da177e4
LT		 581 if (name.len == 0)
582 return 0;
583 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 584 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 585 return 0;
586 }
587 return 1;
588}
589
fd39ca9a 590static void
1da177e4
LT		 591add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
592{
593 unsigned int idhashval;
594
595 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
596 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
597 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
598 list_add_tail(&clp->cl_lru, &client_lru);
599 clp->cl_time = get_seconds();
600}
601
fd39ca9a 602static void
1da177e4
LT		 603move_to_confirmed(struct nfs4_client *clp)
604{
605 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
606 unsigned int strhashval;
607
608 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
609 list_del_init(&clp->cl_strhash);
f116629d 610 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 611 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 612 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
613 renew_client(clp);
614}
615
616static struct nfs4_client *
617find_confirmed_client(clientid_t *clid)
618{
619 struct nfs4_client *clp;
620 unsigned int idhashval = clientid_hashval(clid->cl_id);
621
622 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 623 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 624 return clp;
625 }
626 return NULL;
627}
628
629static struct nfs4_client *
630find_unconfirmed_client(clientid_t *clid)
631{
632 struct nfs4_client *clp;
633 unsigned int idhashval = clientid_hashval(clid->cl_id);
634
635 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 636 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 637 return clp;
638 }
639 return NULL;
640}
641
28ce6054
N		 642static struct nfs4_client *
643find_confirmed_client_by_str(const char *dname, unsigned int hashval)
644{
645 struct nfs4_client *clp;
646
647 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
648 if (same_name(clp->cl_recdir, dname))
649 return clp;
650 }
651 return NULL;
652}
653
654static struct nfs4_client *
655find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
656{
657 struct nfs4_client *clp;
658
659 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
660 if (same_name(clp->cl_recdir, dname))
661 return clp;
662 }
663 return NULL;
664}
665
1da177e4
LT		 666/* a helper function for parse_callback */
667static int
668parse_octet(unsigned int *lenp, char **addrp)
669{
670 unsigned int len = *lenp;
671 char *p = *addrp;
672 int n = -1;
673 char c;
674
675 for (;;) {
676 if (!len)
677 break;
678 len--;
679 c = *p++;
680 if (c == '.')
681 break;
682 if ((c < '0') || (c > '9')) {
683 n = -1;
684 break;
685 }
686 if (n < 0)
687 n = 0;
688 n = (n * 10) + (c - '0');
689 if (n > 255) {
690 n = -1;
691 break;
692 }
693 }
694 *lenp = len;
695 *addrp = p;
696 return n;
697}
698
699/* parse and set the setclientid ipv4 callback address */
fd39ca9a 700static int
1da177e4
LT		 701parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
702{
703 int temp = 0;
704 u32 cbaddr = 0;
705 u16 cbport = 0;
706 u32 addrlen = addr_len;
707 char *addr = addr_val;
708 int i, shift;
709
710 /* ipaddress */
711 shift = 24;
712 for(i = 4; i > 0 ; i--) {
713 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
714 return 0;
715 }
716 cbaddr |= (temp << shift);
717 if (shift > 0)
718 shift -= 8;
719 }
720 *cbaddrp = cbaddr;
721
722 /* port */
723 shift = 8;
724 for(i = 2; i > 0 ; i--) {
725 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
726 return 0;
727 }
728 cbport |= (temp << shift);
729 if (shift > 0)
730 shift -= 8;
731 }
732 *cbportp = cbport;
733 return 1;
734}
735
fd39ca9a 736static void
1da177e4
LT		 737gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
738{
739 struct nfs4_callback *cb = &clp->cl_callback;
740
741 /* Currently, we only support tcp for the callback channel */
742 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
743 goto out_err;
744
745 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
746 &cb->cb_addr, &cb->cb_port)))
747 goto out_err;
748 cb->cb_prog = se->se_callback_prog;
749 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 750 return;
751out_err:
849823c5 752 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 753 "will not receive delegations\n",
754 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
755
1da177e4
LT		 756 return;
757}
758
b37ad28b 759__be32
b591480b
BF		 760nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
761 struct nfsd4_setclientid *setclid)
1da177e4 762{
27459f09 763 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 764 struct xdr_netobj clname = {
765 .len = setclid->se_namelen,
766 .data = setclid->se_name,
767 };
768 nfs4_verifier clverifier = setclid->se_verf;
769 unsigned int strhashval;
28ce6054 770 struct nfs4_client *conf, *unconf, *new;
b37ad28b 771 __be32 status;
68e76ad0 772 char *princ;
a55370a3 773 char dname[HEXDIR_LEN];
1da177e4 774
1da177e4 775 if (!check_name(clname))
73aea4ec 776 return nfserr_inval;
1da177e4 777
a55370a3
N		 778 status = nfs4_make_rec_clidname(dname, &clname);
779 if (status)
73aea4ec 780 return status;
a55370a3 781
1da177e4
LT		 782 /*
783 * XXX The Duplicate Request Cache (DRC) has been checked (??)
784 * We get here on a DRC miss.
785 */
786
a55370a3 787 strhashval = clientstr_hashval(dname);
1da177e4 788
1da177e4 789 nfs4_lock_state();
28ce6054
N		 790 conf = find_confirmed_client_by_str(dname, strhashval);
791 if (conf) {
a186e767 792 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 793 status = nfserr_clid_inuse;
599e0a22 794 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 795 || conf->cl_addr != sin->sin_addr.s_addr) {
be859405
HH		 796 dprintk("NFSD: setclientid: string in use by clientat %pI4\n",
797 &conf->cl_addr);
1da177e4
LT		 798 goto out;
799 }
1da177e4 800 }
a186e767
BF		 801 /*
802 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
803 * has a description of SETCLIENTID request processing consisting
804 * of 5 bullet points, labeled as CASE0 - CASE4 below.
805 */
28ce6054 806 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 807 status = nfserr_resource;
808 if (!conf) {
a186e767
BF		 809 /*
810 * RFC 3530 14.2.33 CASE 4:
811 * placed first, because it is the normal case
1da177e4
LT		 812 */
813 if (unconf)
814 expire_client(unconf);
a55370a3
N		 815 new = create_client(clname, dname);
816 if (new == NULL)
1da177e4 817 goto out;
1da177e4 818 gen_clid(new);
599e0a22 819 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 820 /*
a186e767
BF		 821 * RFC 3530 14.2.33 CASE 1:
822 * probable callback update
1da177e4 823 */
31f4a6c1
N		 824 if (unconf) {
825 /* Note this is removing unconfirmed {*x***},
826 * which is stronger than RFC recommended {vxc**}.
827 * This has the advantage that there is at most
828 * one {*x***} in either list at any time.
829 */
830 expire_client(unconf);
1da177e4 831 }
a55370a3
N		 832 new = create_client(clname, dname);
833 if (new == NULL)
1da177e4 834 goto out;
1da177e4 835 copy_clid(new, conf);
1da177e4
LT		 836 } else if (!unconf) {
837 /*
a186e767
BF		 838 * RFC 3530 14.2.33 CASE 2:
839 * probable client reboot; state will be removed if
840 * confirmed.
1da177e4 841 */
a55370a3
N		 842 new = create_client(clname, dname);
843 if (new == NULL)
1da177e4 844 goto out;
1da177e4 845 gen_clid(new);
49ba8781 846 } else {
a186e767
BF		 847 /*
848 * RFC 3530 14.2.33 CASE 3:
849 * probable client reboot; state will be removed if
850 * confirmed.
1da177e4
LT		 851 */
852 expire_client(unconf);
a55370a3
N		 853 new = create_client(clname, dname);
854 if (new == NULL)
1da177e4 855 goto out;
1da177e4 856 gen_clid(new);
1da177e4 857 }
c175b83c
BF		 858 copy_verf(new, &clverifier);
859 new->cl_addr = sin->sin_addr.s_addr;
61054b14 860 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 861 princ = svc_gss_principal(rqstp);
862 if (princ) {
863 new->cl_principal = kstrdup(princ, GFP_KERNEL);
864 if (new->cl_principal == NULL) {
865 free_client(new);
866 goto out;
867 }
868 }
c175b83c
BF		 869 copy_cred(&new->cl_cred, &rqstp->rq_cred);
870 gen_confirm(new);
871 gen_callback(new, setclid);
872 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 873 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
874 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
875 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
876 status = nfs_ok;
877out:
878 nfs4_unlock_state();
879 return status;
880}
881
882
883/*
a186e767
BF		 884 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
885 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
886 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 887 */
b37ad28b 888__be32
b591480b
BF		 889nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
890 struct nfsd4_compound_state *cstate,
891 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 892{
27459f09 893 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 894 struct nfs4_client *conf, *unconf;
1da177e4
LT		 895 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
896 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 897 __be32 status;
1da177e4
LT		 898
899 if (STALE_CLIENTID(clid))
900 return nfserr_stale_clientid;
901 /*
902 * XXX The Duplicate Request Cache (DRC) has been checked (??)
903 * We get here on a DRC miss.
904 */
905
906 nfs4_lock_state();
21ab45a4
N		 907
908 conf = find_confirmed_client(clid);
909 unconf = find_unconfirmed_client(clid);
910
911 status = nfserr_clid_inuse;
27459f09 912 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 913 goto out;
27459f09 914 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 915 goto out;
916
a186e767
BF		 917 /*
918 * section 14.2.34 of RFC 3530 has a description of
919 * SETCLIENTID_CONFIRM request processing consisting
920 * of 4 bullet points, labeled as CASE1 - CASE4 below.
921 */
366e0c1d 922 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 923 /*
924 * RFC 3530 14.2.34 CASE 1:
925 * callback update
926 */
599e0a22 927 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 928 status = nfserr_clid_inuse;
929 else {
1a69c179
N		 930 /* XXX: We just turn off callbacks until we can handle
931 * change request correctly. */
cb36d634 932 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 933 gen_confirm(conf);
46309029 934 nfsd4_remove_clid_dir(unconf);
1a69c179 935 expire_client(unconf);
1da177e4 936 status = nfs_ok;
1a69c179 937
1da177e4 938 }
f3aba4e5 939 } else if (conf && !unconf) {
a186e767
BF		 940 /*
941 * RFC 3530 14.2.34 CASE 2:
942 * probable retransmitted request; play it safe and
943 * do nothing.
7c79f737 944 */
599e0a22 945 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 946 status = nfserr_clid_inuse;
21ab45a4 947 else
1da177e4 948 status = nfs_ok;
7c79f737 949 } else if (!conf && unconf
599e0a22 950 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 951 /*
952 * RFC 3530 14.2.34 CASE 3:
953 * Normal case; new or rebooted client:
7c79f737 954 */
599e0a22 955 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 956 status = nfserr_clid_inuse;
957 } else {
1a69c179
N		 958 unsigned int hash =
959 clientstr_hashval(unconf->cl_recdir);
960 conf = find_confirmed_client_by_str(unconf->cl_recdir,
961 hash);
962 if (conf) {
c7b9a459 963 nfsd4_remove_clid_dir(conf);
1a69c179
N		 964 expire_client(conf);
965 }
1da177e4 966 move_to_confirmed(unconf);
21ab45a4 967 conf = unconf;
46f8a64b 968 nfsd4_probe_callback(conf);
1a69c179 969 status = nfs_ok;
1da177e4 970 }
599e0a22
BF		 971 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
972 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 973 &confirm)))) {
a186e767
BF		 974 /*
975 * RFC 3530 14.2.34 CASE 4:
976 * Client probably hasn't noticed that we rebooted yet.
7c79f737 977 */
1da177e4 978 status = nfserr_stale_clientid;
7c79f737 979 } else {
08e8987c
N		 980 /* check that we have hit one of the cases...*/
981 status = nfserr_clid_inuse;
982 }
1da177e4 983out:
1da177e4
LT		 984 nfs4_unlock_state();
985 return status;
986}
987
1da177e4
LT		 988/* OPEN Share state helper functions */
989static inline struct nfs4_file *
990alloc_init_file(struct inode *ino)
991{
992 struct nfs4_file *fp;
993 unsigned int hashval = file_hashval(ino);
994
e60d4398
N		 995 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
996 if (fp) {
8b671b80 997 atomic_set(&fp->fi_ref, 1);
1da177e4 998 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 999 INIT_LIST_HEAD(&fp->fi_stateids);
1000 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1001 spin_lock(&recall_lock);
1da177e4 1002 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1003 spin_unlock(&recall_lock);
1da177e4
LT		 1004 fp->fi_inode = igrab(ino);
1005 fp->fi_id = current_fileid++;
47f9940c 1006 fp->fi_had_conflict = false;
1da177e4
LT		 1007 return fp;
1008 }
1009 return NULL;
1010}
1011
e60d4398 1012static void
e18b890b 1013nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1014{
e60d4398
N		 1015 if (*slab == NULL)
1016 return;
1a1d92c1 1017 kmem_cache_destroy(*slab);
e60d4398 1018 *slab = NULL;
1da177e4
LT		 1019}
1020
e8ff2a84 1021void
1da177e4
LT		 1022nfsd4_free_slabs(void)
1023{
e60d4398
N		 1024 nfsd4_free_slab(&stateowner_slab);
1025 nfsd4_free_slab(&file_slab);
5ac049ac 1026 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1027 nfsd4_free_slab(&deleg_slab);
e60d4398 1028}
1da177e4 1029
e60d4398
N		 1030static int
1031nfsd4_init_slabs(void)
1032{
1033 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1034 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1035 if (stateowner_slab == NULL)
1036 goto out_nomem;
1037 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1038 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1039 if (file_slab == NULL)
1040 goto out_nomem;
5ac049ac 1041 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1042 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1043 if (stateid_slab == NULL)
1044 goto out_nomem;
5b2d21c1 1045 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1046 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1047 if (deleg_slab == NULL)
1048 goto out_nomem;
e60d4398
N		 1049 return 0;
1050out_nomem:
1051 nfsd4_free_slabs();
1052 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1053 return -ENOMEM;
1da177e4
LT		 1054}
1055
1056void
1057nfs4_free_stateowner(struct kref *kref)
1058{
1059 struct nfs4_stateowner *sop =
1060 container_of(kref, struct nfs4_stateowner, so_ref);
1061 kfree(sop->so_owner.data);
1062 kmem_cache_free(stateowner_slab, sop);
1063}
1064
1065static inline struct nfs4_stateowner *
1066alloc_stateowner(struct xdr_netobj *owner)
1067{
1068 struct nfs4_stateowner *sop;
1069
1070 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1071 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1072 memcpy(sop->so_owner.data, owner->data, owner->len);
1073 sop->so_owner.len = owner->len;
1074 kref_init(&sop->so_ref);
1075 return sop;
1076 }
1077 kmem_cache_free(stateowner_slab, sop);
1078 }
1079 return NULL;
1080}
1081
1082static struct nfs4_stateowner *
1083alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1084 struct nfs4_stateowner *sop;
1085 struct nfs4_replay *rp;
1086 unsigned int idhashval;
1087
1088 if (!(sop = alloc_stateowner(&open->op_owner)))
1089 return NULL;
1090 idhashval = ownerid_hashval(current_ownerid);
1091 INIT_LIST_HEAD(&sop->so_idhash);
1092 INIT_LIST_HEAD(&sop->so_strhash);
1093 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1094 INIT_LIST_HEAD(&sop->so_stateids);
1095 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1096 INIT_LIST_HEAD(&sop->so_close_lru);
1097 sop->so_time = 0;
1098 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1099 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1100 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1101 sop->so_is_open_owner = 1;
1102 sop->so_id = current_ownerid++;
1103 sop->so_client = clp;
1104 sop->so_seqid = open->op_seqid;
1105 sop->so_confirmed = 0;
1106 rp = &sop->so_replay;
de1ae286 1107 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1108 rp->rp_buflen = 0;
1109 rp->rp_buf = rp->rp_ibuf;
1110 return sop;
1111}
1112
1da177e4
LT		 1113static inline void
1114init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1115 struct nfs4_stateowner *sop = open->op_stateowner;
1116 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1117
1118 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1119 INIT_LIST_HEAD(&stp->st_perstateowner);
1120 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1121 INIT_LIST_HEAD(&stp->st_perfile);
1122 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1123 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1124 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1125 stp->st_stateowner = sop;
13cd2184 1126 get_nfs4_file(fp);
1da177e4
LT		 1127 stp->st_file = fp;
1128 stp->st_stateid.si_boot = boot_time;
1129 stp->st_stateid.si_stateownerid = sop->so_id;
1130 stp->st_stateid.si_fileid = fp->fi_id;
1131 stp->st_stateid.si_generation = 0;
1132 stp->st_access_bmap = 0;
1133 stp->st_deny_bmap = 0;
1134 __set_bit(open->op_share_access, &stp->st_access_bmap);
1135 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1136 stp->st_openstp = NULL;
1da177e4
LT		 1137}
1138
fd39ca9a 1139static void
1da177e4
LT		 1140move_to_close_lru(struct nfs4_stateowner *sop)
1141{
1142 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1143
358dd55a 1144 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1145 sop->so_time = get_seconds();
1146}
1147
1da177e4 1148static int
599e0a22
BF		 1149same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1150 clientid_t *clid)
1151{
1152 return (sop->so_owner.len == owner->len) &&
1153 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1154 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1155}
1156
1157static struct nfs4_stateowner *
1158find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1159{
1160 struct nfs4_stateowner *so = NULL;
1161
1162 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1163 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1164 return so;
1165 }
1166 return NULL;
1167}
1168
1169/* search file_hashtbl[] for file */
1170static struct nfs4_file *
1171find_file(struct inode *ino)
1172{
1173 unsigned int hashval = file_hashval(ino);
1174 struct nfs4_file *fp;
1175
8b671b80 1176 spin_lock(&recall_lock);
1da177e4 1177 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1178 if (fp->fi_inode == ino) {
1179 get_nfs4_file(fp);
8b671b80 1180 spin_unlock(&recall_lock);
1da177e4 1181 return fp;
13cd2184 1182 }
1da177e4 1183 }
8b671b80 1184 spin_unlock(&recall_lock);
1da177e4
LT		 1185 return NULL;
1186}
1187
8838dc43 1188static inline int access_valid(u32 x)
ba5a6a19 1189{
8838dc43
BF		 1190 if (x < NFS4_SHARE_ACCESS_READ)
1191 return 0;
1192 if (x > NFS4_SHARE_ACCESS_BOTH)
1193 return 0;
1194 return 1;
ba5a6a19
BF		 1195}
1196
8838dc43 1197static inline int deny_valid(u32 x)
ba5a6a19 1198{
8838dc43
BF		 1199 /* Note: unlike access bits, deny bits may be zero. */
1200 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1201}
1da177e4 1202
4f83aa30
BF		 1203/*
1204 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1205 * st_{access,deny}_bmap field of the stateid, in order to track not
1206 * only what share bits are currently in force, but also what
1207 * combinations of share bits previous opens have used. This allows us
1208 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1209 * return an error if the client attempt to downgrade to a combination
1210 * of share bits not explicable by closing some of its previous opens.
1211 *
1212 * XXX: This enforcement is actually incomplete, since we don't keep
1213 * track of access/deny bit combinations; so, e.g., we allow:
1214 *
1215 * OPEN allow read, deny write
1216 * OPEN allow both, deny none
1217 * DOWNGRADE allow read, deny none
1218 *
1219 * which we should reject.
1220 */
fd39ca9a 1221static void
1da177e4
LT		 1222set_access(unsigned int *access, unsigned long bmap) {
1223 int i;
1224
1225 *access = 0;
1226 for (i = 1; i < 4; i++) {
1227 if (test_bit(i, &bmap))
1228 *access |= i;
1229 }
1230}
1231
fd39ca9a 1232static void
1da177e4
LT		 1233set_deny(unsigned int *deny, unsigned long bmap) {
1234 int i;
1235
1236 *deny = 0;
1237 for (i = 0; i < 4; i++) {
1238 if (test_bit(i, &bmap))
1239 *deny |= i ;
1240 }
1241}
1242
1243static int
1244test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1245 unsigned int access, deny;
1246
1247 set_access(&access, stp->st_access_bmap);
1248 set_deny(&deny, stp->st_deny_bmap);
1249 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1250 return 0;
1251 return 1;
1252}
1253
1254/*
1255 * Called to check deny when READ with all zero stateid or
1256 * WRITE with all zero or all one stateid
1257 */
b37ad28b 1258static __be32
1da177e4
LT		 1259nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1260{
1261 struct inode *ino = current_fh->fh_dentry->d_inode;
1262 struct nfs4_file *fp;
1263 struct nfs4_stateid *stp;
b37ad28b 1264 __be32 ret;
1da177e4
LT		 1265
1266 dprintk("NFSD: nfs4_share_conflict\n");
1267
1268 fp = find_file(ino);
13cd2184
N		 1269 if (!fp)
1270 return nfs_ok;
b700949b 1271 ret = nfserr_locked;
1da177e4 1272 /* Search for conflicting share reservations */
13cd2184
N		 1273 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1274 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1275 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1276 goto out;
1da177e4 1277 }
13cd2184
N		 1278 ret = nfs_ok;
1279out:
1280 put_nfs4_file(fp);
1281 return ret;
1da177e4
LT		 1282}
1283
1284static inline void
1285nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1286{
1287 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1288 drop_file_write_access(filp);
1da177e4
LT		 1289 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1290 }
1291}
1292
1293/*
1294 * Recall a delegation
1295 */
1296static int
1297do_recall(void *__dp)
1298{
1299 struct nfs4_delegation *dp = __dp;
1300
47f9940c 1301 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1302 nfsd4_cb_recall(dp);
1303 return 0;
1304}
1305
1306/*
1307 * Spawn a thread to perform a recall on the delegation represented
1308 * by the lease (file_lock)
1309 *
1310 * Called from break_lease() with lock_kernel() held.
1311 * Note: we assume break_lease will only call this *once* for any given
1312 * lease.
1313 */
1314static
1315void nfsd_break_deleg_cb(struct file_lock *fl)
1316{
1317 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1318 struct task_struct *t;
1319
1320 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1321 if (!dp)
1322 return;
1323
1324 /* We're assuming the state code never drops its reference
1325 * without first removing the lease. Since we're in this lease
1326 * callback (and since the lease code is serialized by the kernel
1327 * lock) we know the server hasn't removed the lease yet, we know
1328 * it's safe to take a reference: */
1329 atomic_inc(&dp->dl_count);
cfdcad4d 1330 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1331
1332 spin_lock(&recall_lock);
1333 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1334 spin_unlock(&recall_lock);
1335
1336 /* only place dl_time is set. protected by lock_kernel*/
1337 dp->dl_time = get_seconds();
1338
0272e1fd
BF		 1339 /*
1340 * We don't want the locks code to timeout the lease for us;
1341 * we'll remove it ourself if the delegation isn't returned
1342 * in time.
1343 */
1344 fl->fl_break_time = 0;
1da177e4
LT		 1345
1346 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1347 if (IS_ERR(t)) {
1348 struct nfs4_client *clp = dp->dl_client;
1349
1350 printk(KERN_INFO "NFSD: Callback thread failed for "
1351 "for client (clientid %08x/%08x)\n",
1352 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1353 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1354 nfs4_put_delegation(dp);
1355 }
1356}
1357
1358/*
1359 * The file_lock is being reapd.
1360 *
1361 * Called by locks_free_lock() with lock_kernel() held.
1362 */
1363static
1364void nfsd_release_deleg_cb(struct file_lock *fl)
1365{
1366 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1367
1368 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1369
1370 if (!(fl->fl_flags & FL_LEASE) || !dp)
1371 return;
1372 dp->dl_flock = NULL;
1373}
1374
1375/*
1376 * Set the delegation file_lock back pointer.
1377 *
a9933cea 1378 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1379 */
1380static
1381void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1382{
1383 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1384
1385 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1386 if (!dp)
1387 return;
1388 dp->dl_flock = new;
1389}
1390
1391/*
a9933cea 1392 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1393 */
1394static
1395int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1396{
1397 struct nfs4_delegation *onlistd =
1398 (struct nfs4_delegation *)onlist->fl_owner;
1399 struct nfs4_delegation *tryd =
1400 (struct nfs4_delegation *)try->fl_owner;
1401
1402 if (onlist->fl_lmops != try->fl_lmops)
1403 return 0;
1404
1405 return onlistd->dl_client == tryd->dl_client;
1406}
1407
1408
1409static
1410int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1411{
1412 if (arg & F_UNLCK)
1413 return lease_modify(onlist, arg);
1414 else
1415 return -EAGAIN;
1416}
1417
fd39ca9a 1418static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1419 .fl_break = nfsd_break_deleg_cb,
1420 .fl_release_private = nfsd_release_deleg_cb,
1421 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1422 .fl_mylease = nfsd_same_client_deleg_cb,
1423 .fl_change = nfsd_change_deleg_cb,
1424};
1425
1426
b37ad28b 1427__be32
1da177e4
LT		 1428nfsd4_process_open1(struct nfsd4_open *open)
1429{
1da177e4
LT		 1430 clientid_t *clientid = &open->op_clientid;
1431 struct nfs4_client *clp = NULL;
1432 unsigned int strhashval;
1433 struct nfs4_stateowner *sop = NULL;
1434
1da177e4 1435 if (!check_name(open->op_owner))
0f442aa2 1436 return nfserr_inval;
1da177e4
LT		 1437
1438 if (STALE_CLIENTID(&open->op_clientid))
1439 return nfserr_stale_clientid;
1440
1441 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1442 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1443 open->op_stateowner = sop;
1444 if (!sop) {
1445 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1446 clp = find_confirmed_client(clientid);
1447 if (clp == NULL)
0f442aa2
BF		 1448 return nfserr_expired;
1449 goto renew;
1da177e4 1450 }
0f442aa2
BF		 1451 if (!sop->so_confirmed) {
1452 /* Replace unconfirmed owners without checking for replay. */
1453 clp = sop->so_client;
f044ff83 1454 release_openowner(sop);
0f442aa2
BF		 1455 open->op_stateowner = NULL;
1456 goto renew;
1457 }
1458 if (open->op_seqid == sop->so_seqid - 1) {
1459 if (sop->so_replay.rp_buflen)
a90b061c 1460 return nfserr_replay_me;
0f442aa2
BF		 1461 /* The original OPEN failed so spectacularly
1462 * that we don't even have replay data saved!
1463 * Therefore, we have no choice but to continue
1464 * processing this OPEN; presumably, we'll
1465 * fail again for the same reason.
1466 */
1467 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1468 goto renew;
1469 }
1470 if (open->op_seqid != sop->so_seqid)
1471 return nfserr_bad_seqid;
1da177e4 1472renew:
0f442aa2
BF		 1473 if (open->op_stateowner == NULL) {
1474 sop = alloc_init_open_stateowner(strhashval, clp, open);
1475 if (sop == NULL)
1476 return nfserr_resource;
1477 open->op_stateowner = sop;
1478 }
1479 list_del_init(&sop->so_close_lru);
1da177e4 1480 renew_client(sop->so_client);
0f442aa2 1481 return nfs_ok;
1da177e4
LT		 1482}
1483
b37ad28b 1484static inline __be32
4a6e43e6
N		 1485nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1486{
1487 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1488 return nfserr_openmode;
1489 else
1490 return nfs_ok;
1491}
1492
52f4fb43
N		 1493static struct nfs4_delegation *
1494find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1495{
1496 struct nfs4_delegation *dp;
1497
ea1da636 1498 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1499 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1500 return dp;
1501 }
1502 return NULL;
1503}
1504
b37ad28b 1505static __be32
567d9829
N		 1506nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1507 struct nfs4_delegation **dp)
1508{
1509 int flags;
b37ad28b 1510 __be32 status = nfserr_bad_stateid;
567d9829
N		 1511
1512 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1513 if (*dp == NULL)
c44c5eeb 1514 goto out;
567d9829
N		 1515 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1516 RD_STATE : WR_STATE;
1517 status = nfs4_check_delegmode(*dp, flags);
1518 if (status)
1519 *dp = NULL;
c44c5eeb
N		 1520out:
1521 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1522 return nfs_ok;
1523 if (status)
1524 return status;
1525 open->op_stateowner->so_confirmed = 1;
1526 return nfs_ok;
567d9829
N		 1527}
1528
b37ad28b 1529static __be32
1da177e4
LT		 1530nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1531{
1532 struct nfs4_stateid *local;
b37ad28b 1533 __be32 status = nfserr_share_denied;
1da177e4
LT		 1534 struct nfs4_stateowner *sop = open->op_stateowner;
1535
8beefa24 1536 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1537 /* ignore lock owners */
1538 if (local->st_stateowner->so_is_open_owner == 0)
1539 continue;
1540 /* remember if we have seen this open owner */
1541 if (local->st_stateowner == sop)
1542 *stpp = local;
1543 /* check for conflicting share reservations */
1544 if (!test_share(local, open))
1545 goto out;
1546 }
1547 status = 0;
1548out:
1549 return status;
1550}
1551
5ac049ac
N		 1552static inline struct nfs4_stateid *
1553nfs4_alloc_stateid(void)
1554{
1555 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1556}
1557
b37ad28b 1558static __be32
1da177e4 1559nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1560 struct nfs4_delegation *dp,
1da177e4
LT		 1561 struct svc_fh *cur_fh, int flags)
1562{
1563 struct nfs4_stateid *stp;
1da177e4 1564
5ac049ac 1565 stp = nfs4_alloc_stateid();
1da177e4
LT		 1566 if (stp == NULL)
1567 return nfserr_resource;
1568
567d9829
N		 1569 if (dp) {
1570 get_file(dp->dl_vfs_file);
1571 stp->st_vfs_file = dp->dl_vfs_file;
1572 } else {
b37ad28b 1573 __be32 status;
567d9829
N		 1574 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1575 &stp->st_vfs_file);
1576 if (status) {
1577 if (status == nfserr_dropit)
1578 status = nfserr_jukebox;
5ac049ac 1579 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1580 return status;
1581 }
1da177e4 1582 }
1da177e4
LT		 1583 *stpp = stp;
1584 return 0;
1585}
1586
b37ad28b 1587static inline __be32
1da177e4
LT		 1588nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1589 struct nfsd4_open *open)
1590{
1591 struct iattr iattr = {
1592 .ia_valid = ATTR_SIZE,
1593 .ia_size = 0,
1594 };
1595 if (!open->op_truncate)
1596 return 0;
1597 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1598 return nfserr_inval;
1da177e4
LT		 1599 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1600}
1601
b37ad28b 1602static __be32
1da177e4
LT		 1603nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1604{
1605 struct file *filp = stp->st_vfs_file;
7eaa36e2 1606 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1607 unsigned int share_access, new_writer;
b37ad28b 1608 __be32 status;
1da177e4
LT		 1609
1610 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1611 new_writer = (~share_access) & open->op_share_access
1612 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1613
6c26d08f 1614 if (new_writer) {
b37ad28b
AV		 1615 int err = get_write_access(inode);
1616 if (err)
1617 return nfserrno(err);
e518f056
BH		 1618 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1619 if (err)
1620 return nfserrno(err);
1621 file_take_write(filp);
6c26d08f 1622 }
1da177e4
LT		 1623 status = nfsd4_truncate(rqstp, cur_fh, open);
1624 if (status) {
6c26d08f
BF		 1625 if (new_writer)
1626 put_write_access(inode);
1da177e4
LT		 1627 return status;
1628 }
1629 /* remember the open */
6c26d08f 1630 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1631 __set_bit(open->op_share_access, &stp->st_access_bmap);
1632 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1633
1634 return nfs_ok;
1635}
1636
1637
1da177e4 1638static void
37515177 1639nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1640{
37515177
N		 1641 open->op_stateowner->so_confirmed = 1;
1642 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1643}
1644
1645/*
1646 * Attempt to hand out a delegation.
1647 */
1648static void
1649nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1650{
1651 struct nfs4_delegation *dp;
1652 struct nfs4_stateowner *sop = stp->st_stateowner;
1653 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1654 struct file_lock fl, *flp = &fl;
1655 int status, flag = 0;
1656
1657 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1658 open->op_recall = 0;
1659 switch (open->op_claim_type) {
1660 case NFS4_OPEN_CLAIM_PREVIOUS:
1661 if (!atomic_read(&cb->cb_set))
1662 open->op_recall = 1;
1663 flag = open->op_delegate_type;
1664 if (flag == NFS4_OPEN_DELEGATE_NONE)
1665 goto out;
1666 break;
1667 case NFS4_OPEN_CLAIM_NULL:
1668 /* Let's not give out any delegations till everyone's
1669 * had the chance to reclaim theirs.... */
af558e33 1670 if (locks_in_grace())
7b190fec
N		 1671 goto out;
1672 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1673 goto out;
1674 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1675 flag = NFS4_OPEN_DELEGATE_WRITE;
1676 else
1677 flag = NFS4_OPEN_DELEGATE_READ;
1678 break;
1679 default:
1680 goto out;
1681 }
1da177e4
LT		 1682
1683 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1684 if (dp == NULL) {
1685 flag = NFS4_OPEN_DELEGATE_NONE;
1686 goto out;
1687 }
1688 locks_init_lock(&fl);
1689 fl.fl_lmops = &nfsd_lease_mng_ops;
1690 fl.fl_flags = FL_LEASE;
9167f501 1691 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1692 fl.fl_end = OFFSET_MAX;
1693 fl.fl_owner = (fl_owner_t)dp;
1694 fl.fl_file = stp->st_vfs_file;
1695 fl.fl_pid = current->tgid;
1696
a9933cea 1697 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1698 * the lock_manager callbacks fl_mylease and fl_change are used
1699 */
9167f501 1700 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1701 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1702 unhash_delegation(dp);
1da177e4
LT		 1703 flag = NFS4_OPEN_DELEGATE_NONE;
1704 goto out;
1705 }
1706
1707 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1708
1709 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1710 dp->dl_stateid.si_boot,
1711 dp->dl_stateid.si_stateownerid,
1712 dp->dl_stateid.si_fileid,
1713 dp->dl_stateid.si_generation);
1714out:
7b190fec
N		 1715 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1716 && flag == NFS4_OPEN_DELEGATE_NONE
1717 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1718 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1719 open->op_delegate_type = flag;
1720}
1721
1722/*
1723 * called with nfs4_lock_state() held.
1724 */
b37ad28b 1725__be32
1da177e4
LT		 1726nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1727{
1728 struct nfs4_file *fp = NULL;
1729 struct inode *ino = current_fh->fh_dentry->d_inode;
1730 struct nfs4_stateid *stp = NULL;
567d9829 1731 struct nfs4_delegation *dp = NULL;
b37ad28b 1732 __be32 status;
1da177e4
LT		 1733
1734 status = nfserr_inval;
ba5a6a19
BF		 1735 if (!access_valid(open->op_share_access)
1736 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1737 goto out;
1738 /*
1739 * Lookup file; if found, lookup stateid and check open request,
1740 * and check for delegations in the process of being recalled.
1741 * If not found, create the nfs4_file struct
1742 */
1743 fp = find_file(ino);
1744 if (fp) {
1745 if ((status = nfs4_check_open(fp, open, &stp)))
1746 goto out;
c44c5eeb
N		 1747 status = nfs4_check_deleg(fp, open, &dp);
1748 if (status)
1749 goto out;
1da177e4 1750 } else {
c44c5eeb
N		 1751 status = nfserr_bad_stateid;
1752 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1753 goto out;
1da177e4
LT		 1754 status = nfserr_resource;
1755 fp = alloc_init_file(ino);
1756 if (fp == NULL)
1757 goto out;
1758 }
1759
1760 /*
1761 * OPEN the file, or upgrade an existing OPEN.
1762 * If truncate fails, the OPEN fails.
1763 */
1764 if (stp) {
1765 /* Stateid was found, this is an OPEN upgrade */
1766 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1767 if (status)
1768 goto out;
444c2c07 1769 update_stateid(&stp->st_stateid);
1da177e4
LT		 1770 } else {
1771 /* Stateid was not found, this is a new OPEN */
1772 int flags = 0;
9ecb6a08 1773 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 1774 flags |= NFSD_MAY_READ;
1da177e4 1775 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 1776 flags |= NFSD_MAY_WRITE;
567d9829
N		 1777 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1778 if (status)
1da177e4
LT		 1779 goto out;
1780 init_stateid(stp, fp, open);
1781 status = nfsd4_truncate(rqstp, current_fh, open);
1782 if (status) {
2283963f 1783 release_open_stateid(stp);
1da177e4
LT		 1784 goto out;
1785 }
1786 }
1787 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1788
1789 /*
1790 * Attempt to hand out a delegation. No error return, because the
1791 * OPEN succeeds even if we fail.
1792 */
1793 nfs4_open_delegation(current_fh, open, stp);
1794
1795 status = nfs_ok;
1796
1797 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1798 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1799 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1800out:
13cd2184
N		 1801 if (fp)
1802 put_nfs4_file(fp);
37515177
N		 1803 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1804 nfs4_set_claim_prev(open);
1da177e4
LT		 1805 /*
1806 * To finish the open response, we just need to set the rflags.
1807 */
1808 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1809 if (!open->op_stateowner->so_confirmed)
1810 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1811
1812 return status;
1813}
1814
b37ad28b 1815__be32
b591480b
BF		 1816nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1817 clientid_t *clid)
1da177e4
LT		 1818{
1819 struct nfs4_client *clp;
b37ad28b 1820 __be32 status;
1da177e4
LT		 1821
1822 nfs4_lock_state();
1823 dprintk("process_renew(%08x/%08x): starting\n",
1824 clid->cl_boot, clid->cl_id);
1825 status = nfserr_stale_clientid;
1826 if (STALE_CLIENTID(clid))
1827 goto out;
1828 clp = find_confirmed_client(clid);
1829 status = nfserr_expired;
1830 if (clp == NULL) {
1831 /* We assume the client took too long to RENEW. */
1832 dprintk("nfsd4_renew: clientid not found!\n");
1833 goto out;
1834 }
1835 renew_client(clp);
1836 status = nfserr_cb_path_down;
ea1da636 1837 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1838 && !atomic_read(&clp->cl_callback.cb_set))
1839 goto out;
1840 status = nfs_ok;
1841out:
1842 nfs4_unlock_state();
1843 return status;
1844}
1845
af558e33
BF		 1846struct lock_manager nfsd4_manager = {
1847};
1848
a76b4319 1849static void
af558e33 1850nfsd4_end_grace(void)
a76b4319
N		 1851{
1852 dprintk("NFSD: end of grace period\n");
c7b9a459 1853 nfsd4_recdir_purge_old();
af558e33 1854 locks_end_grace(&nfsd4_manager);
a76b4319
N		 1855}
1856
fd39ca9a 1857static time_t
1da177e4
LT		 1858nfs4_laundromat(void)
1859{
1860 struct nfs4_client *clp;
1861 struct nfs4_stateowner *sop;
1862 struct nfs4_delegation *dp;
1863 struct list_head *pos, *next, reaplist;
1864 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1865 time_t t, clientid_val = NFSD_LEASE_TIME;
1866 time_t u, test_val = NFSD_LEASE_TIME;
1867
1868 nfs4_lock_state();
1869
1870 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 1871 if (locks_in_grace())
1872 nfsd4_end_grace();
1da177e4
LT		 1873 list_for_each_safe(pos, next, &client_lru) {
1874 clp = list_entry(pos, struct nfs4_client, cl_lru);
1875 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1876 t = clp->cl_time - cutoff;
1877 if (clientid_val > t)
1878 clientid_val = t;
1879 break;
1880 }
1881 dprintk("NFSD: purging unused client (clientid %08x)\n",
1882 clp->cl_clientid.cl_id);
c7b9a459 1883 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1884 expire_client(clp);
1885 }
1886 INIT_LIST_HEAD(&reaplist);
1887 spin_lock(&recall_lock);
1888 list_for_each_safe(pos, next, &del_recall_lru) {
1889 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1890 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1891 u = dp->dl_time - cutoff;
1892 if (test_val > u)
1893 test_val = u;
1894 break;
1895 }
1896 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1897 dp, dp->dl_flock);
1898 list_move(&dp->dl_recall_lru, &reaplist);
1899 }
1900 spin_unlock(&recall_lock);
1901 list_for_each_safe(pos, next, &reaplist) {
1902 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1903 list_del_init(&dp->dl_recall_lru);
1904 unhash_delegation(dp);
1905 }
1906 test_val = NFSD_LEASE_TIME;
1907 list_for_each_safe(pos, next, &close_lru) {
1908 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1909 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1910 u = sop->so_time - cutoff;
1911 if (test_val > u)
1912 test_val = u;
1913 break;
1914 }
1915 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1916 sop->so_id);
f044ff83 1917 release_openowner(sop);
1da177e4
LT		 1918 }
1919 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1920 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1921 nfs4_unlock_state();
1922 return clientid_val;
1923}
1924
a254b246
HH		 1925static struct workqueue_struct *laundry_wq;
1926static void laundromat_main(struct work_struct *);
1927static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1928
1929static void
c4028958 1930laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1931{
1932 time_t t;
1933
1934 t = nfs4_laundromat();
1935 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1936 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1937}
1938
fd39ca9a 1939static struct nfs4_stateowner *
f8816512
N		 1940search_close_lru(u32 st_id, int flags)
1941{
1da177e4
LT		 1942 struct nfs4_stateowner *local = NULL;
1943
1da177e4
LT		 1944 if (flags & CLOSE_STATE) {
1945 list_for_each_entry(local, &close_lru, so_close_lru) {
1946 if (local->so_id == st_id)
1947 return local;
1948 }
1949 }
1950 return NULL;
1951}
1952
1953static inline int
1954nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1955{
7eaa36e2 1956 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1957}
1958
1959static int
1960STALE_STATEID(stateid_t *stateid)
1961{
1962 if (stateid->si_boot == boot_time)
1963 return 0;
849823c5 1964 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1965 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1966 stateid->si_generation);
1967 return 1;
1968}
1969
1970static inline int
1971access_permit_read(unsigned long access_bmap)
1972{
1973 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1974 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1975 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1976}
1977
1978static inline int
1979access_permit_write(unsigned long access_bmap)
1980{
1981 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1982 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1983}
1984
1985static
b37ad28b 1986__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1987{
b37ad28b 1988 __be32 status = nfserr_openmode;
1da177e4
LT		 1989
1990 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1991 goto out;
1992 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1993 goto out;
1994 status = nfs_ok;
1995out:
1996 return status;
1997}
1998
b37ad28b 1999static inline __be32
1da177e4
LT		 2000check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2001{
203a8c8e 2002 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2003 return nfs_ok;
af558e33 2004 else if (locks_in_grace()) {
1da177e4
LT		 2005 /* Answer in remaining cases depends on existance of
2006 * conflicting state; so we must wait out the grace period. */
2007 return nfserr_grace;
2008 } else if (flags & WR_STATE)
2009 return nfs4_share_conflict(current_fh,
2010 NFS4_SHARE_DENY_WRITE);
2011 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2012 return nfs4_share_conflict(current_fh,
2013 NFS4_SHARE_DENY_READ);
2014}
2015
2016/*
2017 * Allow READ/WRITE during grace period on recovered state only for files
2018 * that are not able to provide mandatory locking.
2019 */
2020static inline int
18f82731 2021grace_disallows_io(struct inode *inode)
1da177e4 2022{
203a8c8e 2023 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2024}
2025
0836f587
BF		 2026static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2027{
2028 /* If the client sends us a stateid from the future, it's buggy: */
2029 if (in->si_generation > ref->si_generation)
2030 return nfserr_bad_stateid;
2031 /*
2032 * The following, however, can happen. For example, if the
2033 * client sends an open and some IO at the same time, the open
2034 * may bump si_generation while the IO is still in flight.
2035 * Thanks to hard links and renames, the client never knows what
2036 * file an open will affect. So it could avoid that situation
2037 * only by serializing all opens and IO from the same open
2038 * owner. To recover from the old_stateid error, the client
2039 * will just have to retry the IO:
2040 */
2041 if (in->si_generation < ref->si_generation)
2042 return nfserr_old_stateid;
2043 return nfs_ok;
2044}
2045
3e633079
BF		 2046static int is_delegation_stateid(stateid_t *stateid)
2047{
2048 return stateid->si_fileid == 0;
2049}
2050
1da177e4
LT		 2051/*
2052* Checks for stateid operations
2053*/
b37ad28b 2054__be32
1da177e4
LT		 2055nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2056{
2057 struct nfs4_stateid *stp = NULL;
2058 struct nfs4_delegation *dp = NULL;
1da177e4 2059 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2060 __be32 status;
1da177e4 2061
1da177e4
LT		 2062 if (filpp)
2063 *filpp = NULL;
2064
18f82731 2065 if (grace_disallows_io(ino))
1da177e4
LT		 2066 return nfserr_grace;
2067
2068 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2069 return check_special_stateids(current_fh, stateid, flags);
2070
1da177e4
LT		 2071 status = nfserr_stale_stateid;
2072 if (STALE_STATEID(stateid))
2073 goto out;
2074
1da177e4 2075 status = nfserr_bad_stateid;
3e633079 2076 if (is_delegation_stateid(stateid)) {
a4455be0 2077 dp = find_delegation_stateid(ino, stateid);
819a8f53 2078 if (!dp)
1da177e4 2079 goto out;
fd03b099 2080 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2081 if (status)
2082 goto out;
dc9bf700
BF		 2083 status = nfs4_check_delegmode(dp, flags);
2084 if (status)
2085 goto out;
2086 renew_client(dp->dl_client);
dc9bf700
BF		 2087 if (filpp)
2088 *filpp = dp->dl_vfs_file;
1da177e4 2089 } else { /* open or lock stateid */
a4455be0 2090 stp = find_stateid(stateid, flags);
819a8f53 2091 if (!stp)
1da177e4 2092 goto out;
6150ef0d 2093 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2094 goto out;
2095 if (!stp->st_stateowner->so_confirmed)
2096 goto out;
fd03b099 2097 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2098 if (status)
2099 goto out;
a4455be0
BF		 2100 status = nfs4_check_openmode(stp, flags);
2101 if (status)
1da177e4
LT		 2102 goto out;
2103 renew_client(stp->st_stateowner->so_client);
2104 if (filpp)
2105 *filpp = stp->st_vfs_file;
1da177e4
LT		 2106 }
2107 status = nfs_ok;
2108out:
2109 return status;
2110}
2111
4c4cd222
N		 2112static inline int
2113setlkflg (int type)
2114{
2115 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2116 RD_STATE : WR_STATE;
2117}
1da177e4
LT		 2118
2119/*
2120 * Checks for sequence id mutating operations.
2121 */
b37ad28b 2122static __be32
4c4cd222 2123nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2124{
1da177e4
LT		 2125 struct nfs4_stateid *stp;
2126 struct nfs4_stateowner *sop;
0836f587 2127 __be32 status;
1da177e4
LT		 2128
2129 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2130 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2131 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2132 stateid->si_generation);
3a4f98bb 2133
1da177e4
LT		 2134 *stpp = NULL;
2135 *sopp = NULL;
2136
1da177e4 2137 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2138 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2139 return nfserr_bad_stateid;
1da177e4
LT		 2140 }
2141
1da177e4 2142 if (STALE_STATEID(stateid))
3a4f98bb 2143 return nfserr_stale_stateid;
1da177e4
LT		 2144 /*
2145 * We return BAD_STATEID if filehandle doesn't match stateid,
2146 * the confirmed flag is incorrecly set, or the generation
2147 * number is incorrect.
1da177e4 2148 */
f8816512
N		 2149 stp = find_stateid(stateid, flags);
2150 if (stp == NULL) {
2151 /*
2152 * Also, we should make sure this isn't just the result of
2153 * a replayed close:
2154 */
2155 sop = search_close_lru(stateid->si_stateownerid, flags);
2156 if (sop == NULL)
2157 return nfserr_bad_stateid;
2158 *sopp = sop;
2159 goto check_replay;
2160 }
1da177e4 2161
39325bd0
BF		 2162 *stpp = stp;
2163 *sopp = sop = stp->st_stateowner;
2164
4c4cd222 2165 if (lock) {
4c4cd222 2166 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2167 struct nfs4_client *clp = sop->so_client;
4c4cd222 2168 int lkflg = 0;
b37ad28b 2169 __be32 status;
4c4cd222
N		 2170
2171 lkflg = setlkflg(lock->lk_type);
2172
2173 if (lock->lk_is_new) {
599e0a22
BF		 2174 if (!sop->so_is_open_owner)
2175 return nfserr_bad_stateid;
2176 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2177 return nfserr_bad_stateid;
599e0a22
BF		 2178 /* stp is the open stateid */
2179 status = nfs4_check_openmode(stp, lkflg);
2180 if (status)
2181 return status;
2182 } else {
2183 /* stp is the lock stateid */
2184 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2185 if (status)
2186 return status;
4c4cd222 2187 }
1da177e4
LT		 2188 }
2189
f3362737 2190 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2191 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2192 return nfserr_bad_stateid;
1da177e4
LT		 2193 }
2194
1da177e4
LT		 2195 /*
2196 * We now validate the seqid and stateid generation numbers.
2197 * For the moment, we ignore the possibility of
2198 * generation number wraparound.
2199 */
bd9aac52 2200 if (seqid != sop->so_seqid)
1da177e4
LT		 2201 goto check_replay;
2202
3a4f98bb 2203 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2204 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2205 " unconfirmed stateowner!\n");
2206 return nfserr_bad_stateid;
1da177e4 2207 }
3a4f98bb 2208 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2209 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2210 " confirmed yet!\n");
2211 return nfserr_bad_stateid;
1da177e4 2212 }
0836f587
BF		 2213 status = check_stateid_generation(stateid, &stp->st_stateid);
2214 if (status)
2215 return status;
52fd004e 2216 renew_client(sop->so_client);
3a4f98bb 2217 return nfs_ok;
1da177e4 2218
1da177e4 2219check_replay:
bd9aac52 2220 if (seqid == sop->so_seqid - 1) {
849823c5 2221 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2222 /* indicate replay to calling function */
a90b061c 2223 return nfserr_replay_me;
1da177e4 2224 }
2fdada03 2225 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2226 sop->so_seqid, seqid);
2227 *sopp = NULL;
2228 return nfserr_bad_seqid;
1da177e4
LT		 2229}
2230
b37ad28b 2231__be32
ca364317 2232nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2233 struct nfsd4_open_confirm *oc)
1da177e4 2234{
b37ad28b 2235 __be32 status;
1da177e4
LT		 2236 struct nfs4_stateowner *sop;
2237 struct nfs4_stateid *stp;
2238
2239 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2240 (int)cstate->current_fh.fh_dentry->d_name.len,
2241 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2242
ca364317 2243 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2244 if (status)
2245 return status;
1da177e4
LT		 2246
2247 nfs4_lock_state();
2248
ca364317
BF		 2249 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2250 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2251 CONFIRM | OPEN_STATE,
1da177e4
LT		 2252 &oc->oc_stateowner, &stp, NULL)))
2253 goto out;
2254
2255 sop = oc->oc_stateowner;
2256 sop->so_confirmed = 1;
2257 update_stateid(&stp->st_stateid);
2258 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2259 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2260 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2261 stp->st_stateid.si_boot,
2262 stp->st_stateid.si_stateownerid,
2263 stp->st_stateid.si_fileid,
2264 stp->st_stateid.si_generation);
c7b9a459
N		 2265
2266 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2267out:
f2327d9a 2268 if (oc->oc_stateowner) {
1da177e4 2269 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2270 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2271 }
1da177e4
LT		 2272 nfs4_unlock_state();
2273 return status;
2274}
2275
2276
2277/*
2278 * unset all bits in union bitmap (bmap) that
2279 * do not exist in share (from successful OPEN_DOWNGRADE)
2280 */
2281static void
2282reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2283{
2284 int i;
2285 for (i = 1; i < 4; i++) {
2286 if ((i & access) != i)
2287 __clear_bit(i, bmap);
2288 }
2289}
2290
2291static void
2292reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2293{
2294 int i;
2295 for (i = 0; i < 4; i++) {
2296 if ((i & deny) != i)
2297 __clear_bit(i, bmap);
2298 }
2299}
2300
b37ad28b 2301__be32
ca364317
BF		 2302nfsd4_open_downgrade(struct svc_rqst *rqstp,
2303 struct nfsd4_compound_state *cstate,
a4f1706a 2304 struct nfsd4_open_downgrade *od)
1da177e4 2305{
b37ad28b 2306 __be32 status;
1da177e4
LT		 2307 struct nfs4_stateid *stp;
2308 unsigned int share_access;
2309
2310 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2311 (int)cstate->current_fh.fh_dentry->d_name.len,
2312 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2313
ba5a6a19
BF		 2314 if (!access_valid(od->od_share_access)
2315 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2316 return nfserr_inval;
2317
2318 nfs4_lock_state();
ca364317
BF		 2319 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2320 od->od_seqid,
1da177e4 2321 &od->od_stateid,
f3362737 2322 OPEN_STATE,
1da177e4
LT		 2323 &od->od_stateowner, &stp, NULL)))
2324 goto out;
2325
2326 status = nfserr_inval;
2327 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2328 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2329 stp->st_access_bmap, od->od_share_access);
2330 goto out;
2331 }
2332 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2333 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2334 stp->st_deny_bmap, od->od_share_deny);
2335 goto out;
2336 }
2337 set_access(&share_access, stp->st_access_bmap);
2338 nfs4_file_downgrade(stp->st_vfs_file,
2339 share_access & ~od->od_share_access);
2340
2341 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2342 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2343
2344 update_stateid(&stp->st_stateid);
2345 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2346 status = nfs_ok;
2347out:
f2327d9a 2348 if (od->od_stateowner) {
1da177e4 2349 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2350 cstate->replay_owner = od->od_stateowner;
f2327d9a 2351 }
1da177e4
LT		 2352 nfs4_unlock_state();
2353 return status;
2354}
2355
2356/*
2357 * nfs4_unlock_state() called after encode
2358 */
b37ad28b 2359__be32
ca364317 2360nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2361 struct nfsd4_close *close)
1da177e4 2362{
b37ad28b 2363 __be32 status;
1da177e4
LT		 2364 struct nfs4_stateid *stp;
2365
2366 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2367 (int)cstate->current_fh.fh_dentry->d_name.len,
2368 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2369
2370 nfs4_lock_state();
2371 /* check close_lru for replay */
ca364317
BF		 2372 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2373 close->cl_seqid,
1da177e4 2374 &close->cl_stateid,
f3362737 2375 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2376 &close->cl_stateowner, &stp, NULL)))
2377 goto out;
1da177e4
LT		 2378 status = nfs_ok;
2379 update_stateid(&stp->st_stateid);
2380 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2381
04ef5954 2382 /* release_stateid() calls nfsd_close() if needed */
2283963f 2383 release_open_stateid(stp);
04ef5954
BF		 2384
2385 /* place unused nfs4_stateowners on so_close_lru list to be
2386 * released by the laundromat service after the lease period
2387 * to enable us to handle CLOSE replay
2388 */
2389 if (list_empty(&close->cl_stateowner->so_stateids))
2390 move_to_close_lru(close->cl_stateowner);
1da177e4 2391out:
f2327d9a 2392 if (close->cl_stateowner) {
1da177e4 2393 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2394 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2395 }
1da177e4
LT		 2396 nfs4_unlock_state();
2397 return status;
2398}
2399
b37ad28b 2400__be32
ca364317
BF		 2401nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2402 struct nfsd4_delegreturn *dr)
1da177e4 2403{
203a8c8e
BF		 2404 struct nfs4_delegation *dp;
2405 stateid_t *stateid = &dr->dr_stateid;
2406 struct inode *inode;
b37ad28b 2407 __be32 status;
1da177e4 2408
ca364317 2409 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2410 return status;
2411 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2412
2413 nfs4_lock_state();
203a8c8e
BF		 2414 status = nfserr_bad_stateid;
2415 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2416 goto out;
2417 status = nfserr_stale_stateid;
2418 if (STALE_STATEID(stateid))
2419 goto out;
7e0f7cf5 2420 status = nfserr_bad_stateid;
203a8c8e
BF		 2421 if (!is_delegation_stateid(stateid))
2422 goto out;
203a8c8e
BF		 2423 dp = find_delegation_stateid(inode, stateid);
2424 if (!dp)
2425 goto out;
2426 status = check_stateid_generation(stateid, &dp->dl_stateid);
2427 if (status)
2428 goto out;
2429 renew_client(dp->dl_client);
2430
2431 unhash_delegation(dp);
1da177e4 2432out:
203a8c8e
BF		 2433 nfs4_unlock_state();
2434
1da177e4
LT		 2435 return status;
2436}
2437
2438
2439/*
2440 * Lock owner state (byte-range locks)
2441 */
2442#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2443#define LOCK_HASH_BITS 8
2444#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2445#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2446
87df4de8
BH		 2447static inline u64
2448end_offset(u64 start, u64 len)
2449{
2450 u64 end;
2451
2452 end = start + len;
2453 return end >= start ? end: NFS4_MAX_UINT64;
2454}
2455
2456/* last octet in a range */
2457static inline u64
2458last_byte_offset(u64 start, u64 len)
2459{
2460 u64 end;
2461
2462 BUG_ON(!len);
2463 end = start + len;
2464 return end > start ? end - 1: NFS4_MAX_UINT64;
2465}
2466
1da177e4
LT		 2467#define lockownerid_hashval(id) \
2468 ((id) & LOCK_HASH_MASK)
2469
2470static inline unsigned int
2471lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2472 struct xdr_netobj *ownername)
2473{
2474 return (file_hashval(inode) + cl_id
2475 + opaque_hashval(ownername->data, ownername->len))
2476 & LOCK_HASH_MASK;
2477}
2478
2479static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2480static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2481static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2482
fd39ca9a 2483static struct nfs4_stateid *
1da177e4
LT		 2484find_stateid(stateid_t *stid, int flags)
2485{
9346eff0 2486 struct nfs4_stateid *local;
1da177e4
LT		 2487 u32 st_id = stid->si_stateownerid;
2488 u32 f_id = stid->si_fileid;
2489 unsigned int hashval;
2490
2491 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2492 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2493 hashval = stateid_hashval(st_id, f_id);
2494 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2495 if ((local->st_stateid.si_stateownerid == st_id) &&
2496 (local->st_stateid.si_fileid == f_id))
2497 return local;
2498 }
2499 }
9346eff0
KK		 2500
2501 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2502 hashval = stateid_hashval(st_id, f_id);
2503 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2504 if ((local->st_stateid.si_stateownerid == st_id) &&
2505 (local->st_stateid.si_fileid == f_id))
2506 return local;
2507 }
849823c5 2508 }
1da177e4
LT		 2509 return NULL;
2510}
2511
2512static struct nfs4_delegation *
2513find_delegation_stateid(struct inode *ino, stateid_t *stid)
2514{
13cd2184
N		 2515 struct nfs4_file *fp;
2516 struct nfs4_delegation *dl;
1da177e4
LT		 2517
2518 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2519 stid->si_boot, stid->si_stateownerid,
2520 stid->si_fileid, stid->si_generation);
2521
1da177e4 2522 fp = find_file(ino);
13cd2184
N		 2523 if (!fp)
2524 return NULL;
2525 dl = find_delegation_file(fp, stid);
2526 put_nfs4_file(fp);
2527 return dl;
1da177e4
LT		 2528}
2529
2530/*
2531 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2532 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2533 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2534 * locking, this prevents us from being completely protocol-compliant. The
2535 * real solution to this problem is to start using unsigned file offsets in
2536 * the VFS, but this is a very deep change!
2537 */
2538static inline void
2539nfs4_transform_lock_offset(struct file_lock *lock)
2540{
2541 if (lock->fl_start < 0)
2542 lock->fl_start = OFFSET_MAX;
2543 if (lock->fl_end < 0)
2544 lock->fl_end = OFFSET_MAX;
2545}
2546
d5b9026a
N		 2547/* Hack!: For now, we're defining this just so we can use a pointer to it
2548 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2549static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2550};
1da177e4
LT		 2551
2552static inline void
2553nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2554{
d5b9026a
N		 2555 struct nfs4_stateowner *sop;
2556 unsigned int hval;
1da177e4 2557
d5b9026a
N		 2558 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2559 sop = (struct nfs4_stateowner *) fl->fl_owner;
2560 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2561 kref_get(&sop->so_ref);
2562 deny->ld_sop = sop;
2563 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2564 } else {
2565 deny->ld_sop = NULL;
2566 deny->ld_clientid.cl_boot = 0;
2567 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2568 }
2569 deny->ld_start = fl->fl_start;
87df4de8
BH		 2570 deny->ld_length = NFS4_MAX_UINT64;
2571 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2572 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2573 deny->ld_type = NFS4_READ_LT;
2574 if (fl->fl_type != F_RDLCK)
2575 deny->ld_type = NFS4_WRITE_LT;
2576}
2577
1da177e4
LT		 2578static struct nfs4_stateowner *
2579find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2580 struct xdr_netobj *owner)
2581{
2582 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2583 struct nfs4_stateowner *op;
2584
2585 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2586 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2587 return op;
2588 }
2589 return NULL;
2590}
2591
2592/*
2593 * Alloc a lock owner structure.
2594 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2595 * occured.
2596 *
2597 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2598 */
2599
2600static struct nfs4_stateowner *
2601alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2602 struct nfs4_stateowner *sop;
2603 struct nfs4_replay *rp;
2604 unsigned int idhashval;
2605
2606 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2607 return NULL;
2608 idhashval = lockownerid_hashval(current_ownerid);
2609 INIT_LIST_HEAD(&sop->so_idhash);
2610 INIT_LIST_HEAD(&sop->so_strhash);
2611 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2612 INIT_LIST_HEAD(&sop->so_stateids);
2613 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2614 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2615 sop->so_time = 0;
2616 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2617 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2618 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2619 sop->so_is_open_owner = 0;
2620 sop->so_id = current_ownerid++;
2621 sop->so_client = clp;
b59e3c0e
NB		 2622 /* It is the openowner seqid that will be incremented in encode in the
2623 * case of new lockowners; so increment the lock seqid manually: */
2624 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2625 sop->so_confirmed = 1;
2626 rp = &sop->so_replay;
de1ae286 2627 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2628 rp->rp_buflen = 0;
2629 rp->rp_buf = rp->rp_ibuf;
2630 return sop;
2631}
2632
fd39ca9a 2633static struct nfs4_stateid *
1da177e4
LT		 2634alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2635{
2636 struct nfs4_stateid *stp;
2637 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2638
5ac049ac
N		 2639 stp = nfs4_alloc_stateid();
2640 if (stp == NULL)
1da177e4
LT		 2641 goto out;
2642 INIT_LIST_HEAD(&stp->st_hash);
2643 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2644 INIT_LIST_HEAD(&stp->st_perstateowner);
2645 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2646 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2647 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2648 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2649 stp->st_stateowner = sop;
13cd2184 2650 get_nfs4_file(fp);
1da177e4
LT		 2651 stp->st_file = fp;
2652 stp->st_stateid.si_boot = boot_time;
2653 stp->st_stateid.si_stateownerid = sop->so_id;
2654 stp->st_stateid.si_fileid = fp->fi_id;
2655 stp->st_stateid.si_generation = 0;
2656 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2657 stp->st_access_bmap = open_stp->st_access_bmap;
2658 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2659 stp->st_openstp = open_stp;
1da177e4
LT		 2660
2661out:
2662 return stp;
2663}
2664
fd39ca9a 2665static int
1da177e4
LT		 2666check_lock_length(u64 offset, u64 length)
2667{
87df4de8 2668 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2669 LOFF_OVERFLOW(offset, length)));
2670}
2671
2672/*
2673 * LOCK operation
2674 */
b37ad28b 2675__be32
ca364317 2676nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2677 struct nfsd4_lock *lock)
1da177e4 2678{
3e9e3dbe 2679 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2680 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2681 struct nfs4_stateid *lock_stp;
2682 struct file *filp;
2683 struct file_lock file_lock;
8dc7c311 2684 struct file_lock conflock;
b37ad28b 2685 __be32 status = 0;
1da177e4 2686 unsigned int strhashval;
150b3934 2687 unsigned int cmd;
b8dd7b9a 2688 int err;
1da177e4
LT		 2689
2690 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2691 (long long) lock->lk_offset,
2692 (long long) lock->lk_length);
2693
1da177e4
LT		 2694 if (check_lock_length(lock->lk_offset, lock->lk_length))
2695 return nfserr_inval;
2696
ca364317 2697 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2698 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2699 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2700 return status;
2701 }
2702
1da177e4
LT		 2703 nfs4_lock_state();
2704
2705 if (lock->lk_is_new) {
893f8770
N		 2706 /*
2707 * Client indicates that this is a new lockowner.
2708 * Use open owner and open stateid to create lock owner and
2709 * lock stateid.
2710 */
1da177e4
LT		 2711 struct nfs4_stateid *open_stp = NULL;
2712 struct nfs4_file *fp;
2713
2714 status = nfserr_stale_clientid;
849823c5 2715 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2716 goto out;
1da177e4 2717
1da177e4 2718 /* validate and update open stateid and open seqid */
ca364317 2719 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2720 lock->lk_new_open_seqid,
2721 &lock->lk_new_open_stateid,
f3362737 2722 OPEN_STATE,
3a65588a 2723 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2724 lock);
37515177 2725 if (status)
1da177e4 2726 goto out;
3a65588a 2727 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2728 /* create lockowner and lock stateid */
2729 fp = open_stp->st_file;
2730 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2731 open_sop->so_client->cl_clientid.cl_id,
2732 &lock->v.new.owner);
3e9e3dbe
N		 2733 /* XXX: Do we need to check for duplicate stateowners on
2734 * the same file, or should they just be allowed (and
2735 * create new stateids)? */
1da177e4 2736 status = nfserr_resource;
b59e3c0e
NB		 2737 lock_sop = alloc_init_lock_stateowner(strhashval,
2738 open_sop->so_client, open_stp, lock);
2739 if (lock_sop == NULL)
1da177e4 2740 goto out;
b59e3c0e 2741 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2742 if (lock_stp == NULL)
1da177e4 2743 goto out;
1da177e4
LT		 2744 } else {
2745 /* lock (lock owner + lock stateid) already exists */
ca364317 2746 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2747 lock->lk_old_lock_seqid,
2748 &lock->lk_old_lock_stateid,
f3362737 2749 LOCK_STATE,
3a65588a 2750 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2751 if (status)
2752 goto out;
3a65588a 2753 lock_sop = lock->lk_replay_owner;
1da177e4 2754 }
3a65588a 2755 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2756 filp = lock_stp->st_vfs_file;
2757
0dd395dc 2758 status = nfserr_grace;
af558e33 2759 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 2760 goto out;
2761 status = nfserr_no_grace;
af558e33 2762 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 2763 goto out;
2764
1da177e4
LT		 2765 locks_init_lock(&file_lock);
2766 switch (lock->lk_type) {
2767 case NFS4_READ_LT:
2768 case NFS4_READW_LT:
2769 file_lock.fl_type = F_RDLCK;
150b3934 2770 cmd = F_SETLK;
1da177e4
LT		 2771 break;
2772 case NFS4_WRITE_LT:
2773 case NFS4_WRITEW_LT:
2774 file_lock.fl_type = F_WRLCK;
150b3934 2775 cmd = F_SETLK;
1da177e4
LT		 2776 break;
2777 default:
2778 status = nfserr_inval;
2779 goto out;
2780 }
b59e3c0e 2781 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2782 file_lock.fl_pid = current->tgid;
2783 file_lock.fl_file = filp;
2784 file_lock.fl_flags = FL_POSIX;
d5b9026a 2785 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2786
2787 file_lock.fl_start = lock->lk_offset;
87df4de8 2788 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 2789 nfs4_transform_lock_offset(&file_lock);
2790
2791 /*
2792 * Try to lock the file in the VFS.
2793 * Note: locks.c uses the BKL to protect the inode's lock list.
2794 */
2795
fd85b817 2796 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2797 switch (-err) {
1da177e4
LT		 2798 case 0: /* success! */
2799 update_stateid(&lock_stp->st_stateid);
2800 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2801 sizeof(stateid_t));
b8dd7b9a 2802 status = 0;
eb76b3fd
AA		 2803 break;
2804 case (EAGAIN): /* conflock holds conflicting lock */
2805 status = nfserr_denied;
2806 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2807 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2808 break;
1da177e4
LT		 2809 case (EDEADLK):
2810 status = nfserr_deadlock;
eb76b3fd 2811 break;
1da177e4 2812 default:
fd85b817 2813 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2814 status = nfserr_resource;
2815 break;
1da177e4 2816 }
1da177e4 2817out:
8a280510 2818 if (status && lock->lk_is_new && lock_sop)
f044ff83 2819 release_lockowner(lock_sop);
3a65588a
BF		 2820 if (lock->lk_replay_owner) {
2821 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2822 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2823 }
1da177e4
LT		 2824 nfs4_unlock_state();
2825 return status;
2826}
2827
55ef1274
BF		 2828/*
2829 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2830 * so we do a temporary open here just to get an open file to pass to
2831 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2832 * inode operation.)
2833 */
2834static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2835{
2836 struct file *file;
2837 int err;
2838
2839 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2840 if (err)
2841 return err;
2842 err = vfs_test_lock(file, lock);
2843 nfsd_close(file);
2844 return err;
2845}
2846
1da177e4
LT		 2847/*
2848 * LOCKT operation
2849 */
b37ad28b 2850__be32
ca364317
BF		 2851nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2852 struct nfsd4_lockt *lockt)
1da177e4
LT		 2853{
2854 struct inode *inode;
1da177e4 2855 struct file_lock file_lock;
fd85b817 2856 int error;
b37ad28b 2857 __be32 status;
1da177e4 2858
af558e33 2859 if (locks_in_grace())
1da177e4
LT		 2860 return nfserr_grace;
2861
2862 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2863 return nfserr_inval;
2864
2865 lockt->lt_stateowner = NULL;
2866 nfs4_lock_state();
2867
2868 status = nfserr_stale_clientid;
849823c5 2869 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2870 goto out;
1da177e4 2871
ca364317 2872 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2873 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2874 if (status == nfserr_symlink)
2875 status = nfserr_inval;
2876 goto out;
2877 }
2878
ca364317 2879 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2880 locks_init_lock(&file_lock);
2881 switch (lockt->lt_type) {
2882 case NFS4_READ_LT:
2883 case NFS4_READW_LT:
2884 file_lock.fl_type = F_RDLCK;
2885 break;
2886 case NFS4_WRITE_LT:
2887 case NFS4_WRITEW_LT:
2888 file_lock.fl_type = F_WRLCK;
2889 break;
2890 default:
2fdada03 2891 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2892 status = nfserr_inval;
2893 goto out;
2894 }
2895
2896 lockt->lt_stateowner = find_lockstateowner_str(inode,
2897 &lockt->lt_clientid, &lockt->lt_owner);
2898 if (lockt->lt_stateowner)
2899 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2900 file_lock.fl_pid = current->tgid;
2901 file_lock.fl_flags = FL_POSIX;
2902
2903 file_lock.fl_start = lockt->lt_offset;
87df4de8 2904 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 2905
2906 nfs4_transform_lock_offset(&file_lock);
2907
1da177e4 2908 status = nfs_ok;
55ef1274 2909 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 2910 if (error) {
2911 status = nfserrno(error);
2912 goto out;
2913 }
9d6a8c5c 2914 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2915 status = nfserr_denied;
9d6a8c5c 2916 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2917 }
2918out:
2919 nfs4_unlock_state();
2920 return status;
2921}
2922
b37ad28b 2923__be32
ca364317 2924nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2925 struct nfsd4_locku *locku)
1da177e4
LT		 2926{
2927 struct nfs4_stateid *stp;
2928 struct file *filp = NULL;
2929 struct file_lock file_lock;
b37ad28b 2930 __be32 status;
b8dd7b9a 2931 int err;
1da177e4
LT		 2932
2933 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2934 (long long) locku->lu_offset,
2935 (long long) locku->lu_length);
2936
2937 if (check_lock_length(locku->lu_offset, locku->lu_length))
2938 return nfserr_inval;
2939
2940 nfs4_lock_state();
2941
ca364317 2942 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2943 locku->lu_seqid,
2944 &locku->lu_stateid,
f3362737 2945 LOCK_STATE,
1da177e4
LT		 2946 &locku->lu_stateowner, &stp, NULL)))
2947 goto out;
2948
2949 filp = stp->st_vfs_file;
2950 BUG_ON(!filp);
2951 locks_init_lock(&file_lock);
2952 file_lock.fl_type = F_UNLCK;
2953 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2954 file_lock.fl_pid = current->tgid;
2955 file_lock.fl_file = filp;
2956 file_lock.fl_flags = FL_POSIX;
d5b9026a 2957 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2958 file_lock.fl_start = locku->lu_offset;
2959
87df4de8 2960 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 2961 nfs4_transform_lock_offset(&file_lock);
2962
2963 /*
2964 * Try to unlock the file in the VFS.
2965 */
fd85b817 2966 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2967 if (err) {
fd85b817 2968 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2969 goto out_nfserr;
2970 }
2971 /*
2972 * OK, unlock succeeded; the only thing left to do is update the stateid.
2973 */
2974 update_stateid(&stp->st_stateid);
2975 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2976
2977out:
f2327d9a 2978 if (locku->lu_stateowner) {
1da177e4 2979 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2980 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2981 }
1da177e4
LT		 2982 nfs4_unlock_state();
2983 return status;
2984
2985out_nfserr:
b8dd7b9a 2986 status = nfserrno(err);
1da177e4
LT		 2987 goto out;
2988}
2989
2990/*
2991 * returns
2992 * 1: locks held by lockowner
2993 * 0: no locks held by lockowner
2994 */
2995static int
2996check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2997{
2998 struct file_lock **flpp;
7eaa36e2 2999 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3000 int status = 0;
3001
3002 lock_kernel();
3003 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3004 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3005 status = 1;
3006 goto out;
796dadfd 3007 }
1da177e4
LT		 3008 }
3009out:
3010 unlock_kernel();
3011 return status;
3012}
3013
b37ad28b 3014__be32
b591480b
BF		 3015nfsd4_release_lockowner(struct svc_rqst *rqstp,
3016 struct nfsd4_compound_state *cstate,
3017 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3018{
3019 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3020 struct nfs4_stateowner *sop;
3021 struct nfs4_stateid *stp;
1da177e4 3022 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3023 struct list_head matches;
3024 int i;
b37ad28b 3025 __be32 status;
1da177e4
LT		 3026
3027 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3028 clid->cl_boot, clid->cl_id);
3029
3030 /* XXX check for lease expiration */
3031
3032 status = nfserr_stale_clientid;
849823c5 3033 if (STALE_CLIENTID(clid))
1da177e4 3034 return status;
1da177e4
LT		 3035
3036 nfs4_lock_state();
3037
3e9e3dbe
N		 3038 status = nfserr_locks_held;
3039 /* XXX: we're doing a linear search through all the lockowners.
3040 * Yipes! For now we'll just hope clients aren't really using
3041 * release_lockowner much, but eventually we have to fix these
3042 * data structures. */
3043 INIT_LIST_HEAD(&matches);
3044 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3045 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3046 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3047 continue;
3048 list_for_each_entry(stp, &sop->so_stateids,
3049 st_perstateowner) {
3050 if (check_for_locks(stp->st_vfs_file, sop))
3051 goto out;
3052 /* Note: so_perclient unused for lockowners,
3053 * so it's OK to fool with here. */
3054 list_add(&sop->so_perclient, &matches);
3055 }
1da177e4 3056 }
3e9e3dbe
N		 3057 }
3058 /* Clients probably won't expect us to return with some (but not all)
3059 * of the lockowner state released; so don't release any until all
3060 * have been checked. */
3061 status = nfs_ok;
0fa822e4
N		 3062 while (!list_empty(&matches)) {
3063 sop = list_entry(matches.next, struct nfs4_stateowner,
3064 so_perclient);
3065 /* unhash_stateowner deletes so_perclient only
3066 * for openowners. */
3067 list_del(&sop->so_perclient);
f044ff83 3068 release_lockowner(sop);
1da177e4
LT		 3069 }
3070out:
3071 nfs4_unlock_state();
3072 return status;
3073}
3074
3075static inline struct nfs4_client_reclaim *
a55370a3 3076alloc_reclaim(void)
1da177e4 3077{
a55370a3 3078 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3079}
3080
c7b9a459
N		 3081int
3082nfs4_has_reclaimed_state(const char *name)
3083{
3084 unsigned int strhashval = clientstr_hashval(name);
3085 struct nfs4_client *clp;
3086
3087 clp = find_confirmed_client_by_str(name, strhashval);
3088 return clp ? 1 : 0;
3089}
3090
1da177e4
LT		 3091/*
3092 * failure => all reset bets are off, nfserr_no_grace...
3093 */
190e4fbf
N		 3094int
3095nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3096{
3097 unsigned int strhashval;
3098 struct nfs4_client_reclaim *crp = NULL;
3099
a55370a3
N		 3100 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3101 crp = alloc_reclaim();
1da177e4
LT		 3102 if (!crp)
3103 return 0;
a55370a3 3104 strhashval = clientstr_hashval(name);
1da177e4
LT		 3105 INIT_LIST_HEAD(&crp->cr_strhash);
3106 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3107 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3108 reclaim_str_hashtbl_size++;
3109 return 1;
3110}
3111
3112static void
3113nfs4_release_reclaim(void)
3114{
3115 struct nfs4_client_reclaim *crp = NULL;
3116 int i;
3117
1da177e4
LT		 3118 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3119 while (!list_empty(&reclaim_str_hashtbl[i])) {
3120 crp = list_entry(reclaim_str_hashtbl[i].next,
3121 struct nfs4_client_reclaim, cr_strhash);
3122 list_del(&crp->cr_strhash);
1da177e4
LT		 3123 kfree(crp);
3124 reclaim_str_hashtbl_size--;
3125 }
3126 }
3127 BUG_ON(reclaim_str_hashtbl_size);
3128}
3129
3130/*
3131 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3132static struct nfs4_client_reclaim *
1da177e4
LT		 3133nfs4_find_reclaim_client(clientid_t *clid)
3134{
3135 unsigned int strhashval;
3136 struct nfs4_client *clp;
3137 struct nfs4_client_reclaim *crp = NULL;
3138
3139
3140 /* find clientid in conf_id_hashtbl */
3141 clp = find_confirmed_client(clid);
3142 if (clp == NULL)
3143 return NULL;
3144
a55370a3
N		 3145 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3146 clp->cl_name.len, clp->cl_name.data,
3147 clp->cl_recdir);
1da177e4
LT		 3148
3149 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3150 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3151 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3152 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3153 return crp;
3154 }
3155 }
3156 return NULL;
3157}
3158
3159/*
3160* Called from OPEN. Look for clientid in reclaim list.
3161*/
b37ad28b 3162__be32
1da177e4
LT		 3163nfs4_check_open_reclaim(clientid_t *clid)
3164{
dfc83565 3165 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3166}
3167
ac4d8ff2 3168/* initialization to perform at module load time: */
1da177e4 3169
e8ff2a84 3170int
ac4d8ff2 3171nfs4_state_init(void)
1da177e4 3172{
e8ff2a84 3173 int i, status;
1da177e4 3174
e8ff2a84
BF		 3175 status = nfsd4_init_slabs();
3176 if (status)
3177 return status;
1da177e4
LT		 3178 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3179 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3180 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3181 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3182 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3183 }
3184 for (i = 0; i < FILE_HASH_SIZE; i++) {
3185 INIT_LIST_HEAD(&file_hashtbl[i]);
3186 }
3187 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3188 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3189 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3190 }
3191 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3192 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3193 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3194 }
3195 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3196 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3197 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3198 }
1da177e4 3199 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3200 INIT_LIST_HEAD(&close_lru);
3201 INIT_LIST_HEAD(&client_lru);
3202 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3203 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3204 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3205 reclaim_str_hashtbl_size = 0;
e8ff2a84 3206 return 0;
ac4d8ff2
N		 3207}
3208
190e4fbf
N		 3209static void
3210nfsd4_load_reboot_recovery_data(void)
3211{
3212 int status;
3213
0964a3d3
N		 3214 nfs4_lock_state();
3215 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3216 status = nfsd4_recdir_load();
0964a3d3 3217 nfs4_unlock_state();
190e4fbf
N		 3218 if (status)
3219 printk("NFSD: Failure reading reboot recovery data\n");
3220}
3221
9a8db97e
ME		 3222unsigned long
3223get_nfs4_grace_period(void)
3224{
3225 return max(user_lease_time, lease_time) * HZ;
3226}
3227
c2f1a551
MS		 3228/*
3229 * Since the lifetime of a delegation isn't limited to that of an open, a
3230 * client may quite reasonably hang on to a delegation as long as it has
3231 * the inode cached. This becomes an obvious problem the first time a
3232 * client's inode cache approaches the size of the server's total memory.
3233 *
3234 * For now we avoid this problem by imposing a hard limit on the number
3235 * of delegations, which varies according to the server's memory size.
3236 */
3237static void
3238set_max_delegations(void)
3239{
3240 /*
3241 * Allow at most 4 delegations per megabyte of RAM. Quick
3242 * estimates suggest that in the worst case (where every delegation
3243 * is for a different inode), a delegation could take about 1.5K,
3244 * giving a worst case usage of about 6% of memory.
3245 */
3246 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3247}
3248
ac4d8ff2
N		 3249/* initialization to perform when the nfsd service is started: */
3250
3251static void
3252__nfs4_state_start(void)
3253{
9a8db97e 3254 unsigned long grace_time;
ac4d8ff2 3255
1da177e4 3256 boot_time = get_seconds();
af558e33 3257 grace_time = get_nfs4_grace_period();
d99a05ad 3258 lease_time = user_lease_time;
af558e33 3259 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3260 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3261 grace_time/HZ);
58da282b 3262 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3263 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3264 set_max_delegations();
1da177e4
LT		 3265}
3266
e8ff2a84 3267void
76a3550e 3268nfs4_state_start(void)
1da177e4 3269{
1da177e4 3270 if (nfs4_init)
e8ff2a84 3271 return;
190e4fbf 3272 nfsd4_load_reboot_recovery_data();
76a3550e 3273 __nfs4_state_start();
1da177e4 3274 nfs4_init = 1;
e8ff2a84 3275 return;
1da177e4
LT		 3276}
3277
1da177e4
LT		 3278time_t
3279nfs4_lease_time(void)
3280{
3281 return lease_time;
3282}
3283
3284static void
3285__nfs4_state_shutdown(void)
3286{
3287 int i;
3288 struct nfs4_client *clp = NULL;
3289 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3290 struct list_head *pos, *next, reaplist;
3291
1da177e4
LT		 3292 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3293 while (!list_empty(&conf_id_hashtbl[i])) {
3294 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3295 expire_client(clp);
3296 }
3297 while (!list_empty(&unconf_str_hashtbl[i])) {
3298 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3299 expire_client(clp);
3300 }
3301 }
3302 INIT_LIST_HEAD(&reaplist);
3303 spin_lock(&recall_lock);
3304 list_for_each_safe(pos, next, &del_recall_lru) {
3305 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3306 list_move(&dp->dl_recall_lru, &reaplist);
3307 }
3308 spin_unlock(&recall_lock);
3309 list_for_each_safe(pos, next, &reaplist) {
3310 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3311 list_del_init(&dp->dl_recall_lru);
3312 unhash_delegation(dp);
3313 }
3314
190e4fbf 3315 nfsd4_shutdown_recdir();
1da177e4 3316 nfs4_init = 0;
1da177e4
LT		 3317}
3318
3319void
3320nfs4_state_shutdown(void)
3321{
5e8d5c29
N		 3322 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3323 destroy_workqueue(laundry_wq);
2c5e7615 3324 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3325 nfs4_lock_state();
3326 nfs4_release_reclaim();
3327 __nfs4_state_shutdown();
1da177e4
LT		 3328 nfs4_unlock_state();
3329}
3330
3dd98a3b
JL		 3331/*
3332 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3333 * accessed when nfsd is starting.
3334 */
0964a3d3
N		 3335static void
3336nfs4_set_recdir(char *recdir)
3337{
0964a3d3 3338 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3339}
3340
3341/*
3342 * Change the NFSv4 recovery directory to recdir.
3343 */
3344int
3345nfs4_reset_recoverydir(char *recdir)
3346{
3347 int status;
a63bb996 3348 struct path path;
0964a3d3 3349
a63bb996 3350 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3351 if (status)
3352 return status;
3353 status = -ENOTDIR;
a63bb996 3354 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3355 nfs4_set_recdir(recdir);
3356 status = 0;
3357 }
a63bb996 3358 path_put(&path);
0964a3d3
N		 3359 return status;
3360}
3361
3dd98a3b
JL		 3362char *
3363nfs4_recoverydir(void)
3364{
3365 return user_recovery_dirname;
3366}
3367
1da177e4
LT		 3368/*
3369 * Called when leasetime is changed.
3370 *
d99a05ad
N		 3371 * The only way the protocol gives us to handle on-the-fly lease changes is to
3372 * simulate a reboot. Instead of doing that, we just wait till the next time
3373 * we start to register any changes in lease time. If the administrator
3374 * really wants to change the lease time *now*, they can go ahead and bring
3375 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3376 *
3377 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3378 * when nfsd is starting
1da177e4
LT		 3379 */
3380void
3381nfs4_reset_lease(time_t leasetime)
3382{
d99a05ad 3383 user_lease_time = leasetime;
1da177e4 3384}
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