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nfsd4: remove unused CHECK_FH flag
[net-next-2.6.git] / fs / nfsd / nfs4state.c
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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
LT		 80
81/* Locking:
82 *
353ab6e9 83 * client_mutex:
1da177e4
LT		 84 * protects clientid_hashtbl[], clientstr_hashtbl[],
85 * unconfstr_hashtbl[], uncofid_hashtbl[].
86 */
353ab6e9 87static DEFINE_MUTEX(client_mutex);
1da177e4 88
e18b890b
CL		 89static struct kmem_cache *stateowner_slab = NULL;
90static struct kmem_cache *file_slab = NULL;
91static struct kmem_cache *stateid_slab = NULL;
92static struct kmem_cache *deleg_slab = NULL;
e60d4398 93
1da177e4
LT		 94void
95nfs4_lock_state(void)
96{
353ab6e9 97 mutex_lock(&client_mutex);
1da177e4
LT		 98}
99
100void
101nfs4_unlock_state(void)
102{
353ab6e9 103 mutex_unlock(&client_mutex);
1da177e4
LT		 104}
105
106static inline u32
107opaque_hashval(const void *ptr, int nbytes)
108{
109 unsigned char *cptr = (unsigned char *) ptr;
110
111 u32 x = 0;
112 while (nbytes--) {
113 x *= 37;
114 x += *cptr++;
115 }
116 return x;
117}
118
1da177e4
LT		 119/*
120 * Delegation state
121 */
122
123/* recall_lock protects the del_recall_lru */
34af946a 124static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 125static struct list_head del_recall_lru;
126
13cd2184
N		 127static void
128free_nfs4_file(struct kref *kref)
129{
130 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
131 list_del(&fp->fi_hash);
132 iput(fp->fi_inode);
133 kmem_cache_free(file_slab, fp);
134}
135
136static inline void
137put_nfs4_file(struct nfs4_file *fi)
138{
139 kref_put(&fi->fi_ref, free_nfs4_file);
140}
141
142static inline void
143get_nfs4_file(struct nfs4_file *fi)
144{
145 kref_get(&fi->fi_ref);
146}
147
ef0f3390 148static int num_delegations;
c2f1a551 149unsigned int max_delegations;
ef0f3390
N		 150
151/*
152 * Open owner state (share locks)
153 */
154
155/* hash tables for nfs4_stateowner */
156#define OWNER_HASH_BITS 8
157#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
158#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
159
160#define ownerid_hashval(id) \
161 ((id) & OWNER_HASH_MASK)
162#define ownerstr_hashval(clientid, ownername) \
163 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
164
165static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
166static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
167
168/* hash table for nfs4_file */
169#define FILE_HASH_BITS 8
170#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
171#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
172/* hash table for (open)nfs4_stateid */
173#define STATEID_HASH_BITS 10
174#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
175#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
176
177#define file_hashval(x) \
178 hash_ptr(x, FILE_HASH_BITS)
179#define stateid_hashval(owner_id, file_id) \
180 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
181
182static struct list_head file_hashtbl[FILE_HASH_SIZE];
183static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
184
1da177e4
LT		 185static struct nfs4_delegation *
186alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
187{
188 struct nfs4_delegation *dp;
189 struct nfs4_file *fp = stp->st_file;
190 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
191
192 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 193 if (fp->fi_had_conflict)
194 return NULL;
c2f1a551 195 if (num_delegations > max_delegations)
ef0f3390 196 return NULL;
5b2d21c1
N		 197 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
198 if (dp == NULL)
1da177e4 199 return dp;
ef0f3390 200 num_delegations++;
ea1da636
N		 201 INIT_LIST_HEAD(&dp->dl_perfile);
202 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 203 INIT_LIST_HEAD(&dp->dl_recall_lru);
204 dp->dl_client = clp;
13cd2184 205 get_nfs4_file(fp);
1da177e4
LT		 206 dp->dl_file = fp;
207 dp->dl_flock = NULL;
208 get_file(stp->st_vfs_file);
209 dp->dl_vfs_file = stp->st_vfs_file;
210 dp->dl_type = type;
211 dp->dl_recall.cbr_dp = NULL;
212 dp->dl_recall.cbr_ident = cb->cb_ident;
213 dp->dl_recall.cbr_trunc = 0;
214 dp->dl_stateid.si_boot = boot_time;
215 dp->dl_stateid.si_stateownerid = current_delegid++;
216 dp->dl_stateid.si_fileid = 0;
217 dp->dl_stateid.si_generation = 0;
6c02eaa1 218 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 219 dp->dl_time = 0;
220 atomic_set(&dp->dl_count, 1);
ea1da636
N		 221 list_add(&dp->dl_perfile, &fp->fi_delegations);
222 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 223 return dp;
224}
225
226void
227nfs4_put_delegation(struct nfs4_delegation *dp)
228{
229 if (atomic_dec_and_test(&dp->dl_count)) {
230 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 231 put_nfs4_file(dp->dl_file);
5b2d21c1 232 kmem_cache_free(deleg_slab, dp);
ef0f3390 233 num_delegations--;
1da177e4
LT		 234 }
235}
236
237/* Remove the associated file_lock first, then remove the delegation.
238 * lease_modify() is called to remove the FS_LEASE file_lock from
239 * the i_flock list, eventually calling nfsd's lock_manager
240 * fl_release_callback.
241 */
242static void
243nfs4_close_delegation(struct nfs4_delegation *dp)
244{
245 struct file *filp = dp->dl_vfs_file;
246
247 dprintk("NFSD: close_delegation dp %p\n",dp);
248 dp->dl_vfs_file = NULL;
249 /* The following nfsd_close may not actually close the file,
250 * but we want to remove the lease in any case. */
c907132d 251 if (dp->dl_flock)
a9933cea 252 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 253 nfsd_close(filp);
1da177e4
LT		 254}
255
256/* Called under the state lock. */
257static void
258unhash_delegation(struct nfs4_delegation *dp)
259{
ea1da636
N		 260 list_del_init(&dp->dl_perfile);
261 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 262 spin_lock(&recall_lock);
263 list_del_init(&dp->dl_recall_lru);
264 spin_unlock(&recall_lock);
265 nfs4_close_delegation(dp);
266 nfs4_put_delegation(dp);
267}
268
269/*
270 * SETCLIENTID state
271 */
272
273/* Hash tables for nfs4_clientid state */
274#define CLIENT_HASH_BITS 4
275#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
276#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
277
278#define clientid_hashval(id) \
279 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 280#define clientstr_hashval(name) \
281 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 282/*
283 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
284 * used in reboot/reset lease grace period processing
285 *
286 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
287 * setclientid_confirmed info.
288 *
289 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
290 * setclientid info.
291 *
292 * client_lru holds client queue ordered by nfs4_client.cl_time
293 * for lease renewal.
294 *
295 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
296 * for last close replay.
297 */
298static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
299static int reclaim_str_hashtbl_size = 0;
300static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
301static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
302static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
303static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
304static struct list_head client_lru;
305static struct list_head close_lru;
306
2283963f
BF		 307static void unhash_generic_stateid(struct nfs4_stateid *stp)
308{
309 list_del(&stp->st_hash);
310 list_del(&stp->st_perfile);
311 list_del(&stp->st_perstateowner);
312}
313
314static void free_generic_stateid(struct nfs4_stateid *stp)
315{
316 put_nfs4_file(stp->st_file);
317 kmem_cache_free(stateid_slab, stp);
318}
319
320static void release_lock_stateid(struct nfs4_stateid *stp)
321{
322 unhash_generic_stateid(stp);
323 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
324 free_generic_stateid(stp);
325}
326
f044ff83
BF		 327static void unhash_lockowner(struct nfs4_stateowner *sop)
328{
329 struct nfs4_stateid *stp;
330
331 list_del(&sop->so_idhash);
332 list_del(&sop->so_strhash);
333 list_del(&sop->so_perstateid);
334 while (!list_empty(&sop->so_stateids)) {
335 stp = list_first_entry(&sop->so_stateids,
336 struct nfs4_stateid, st_perstateowner);
337 release_lock_stateid(stp);
338 }
339}
340
341static void release_lockowner(struct nfs4_stateowner *sop)
342{
343 unhash_lockowner(sop);
344 nfs4_put_stateowner(sop);
345}
346
f1d110ca
BF		 347static void
348release_stateid_lockowners(struct nfs4_stateid *open_stp)
349{
350 struct nfs4_stateowner *lock_sop;
351
352 while (!list_empty(&open_stp->st_lockowners)) {
353 lock_sop = list_entry(open_stp->st_lockowners.next,
354 struct nfs4_stateowner, so_perstateid);
355 /* list_del(&open_stp->st_lockowners); */
356 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 357 release_lockowner(lock_sop);
f1d110ca
BF		 358 }
359}
360
2283963f
BF		 361static void release_open_stateid(struct nfs4_stateid *stp)
362{
363 unhash_generic_stateid(stp);
364 release_stateid_lockowners(stp);
365 nfsd_close(stp->st_vfs_file);
366 free_generic_stateid(stp);
367}
368
f044ff83 369static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 370{
371 struct nfs4_stateid *stp;
372
373 list_del(&sop->so_idhash);
374 list_del(&sop->so_strhash);
f044ff83
BF		 375 list_del(&sop->so_perclient);
376 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 377 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 378 stp = list_first_entry(&sop->so_stateids,
379 struct nfs4_stateid, st_perstateowner);
380 release_open_stateid(stp);
f1d110ca
BF		 381 }
382}
383
f044ff83 384static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 385{
f044ff83 386 unhash_openowner(sop);
f1d110ca
BF		 387 list_del(&sop->so_close_lru);
388 nfs4_put_stateowner(sop);
389}
390
1da177e4
LT		 391static inline void
392renew_client(struct nfs4_client *clp)
393{
394 /*
395 * Move client to the end to the LRU list.
396 */
397 dprintk("renewing client (clientid %08x/%08x)\n",
398 clp->cl_clientid.cl_boot,
399 clp->cl_clientid.cl_id);
400 list_move_tail(&clp->cl_lru, &client_lru);
401 clp->cl_time = get_seconds();
402}
403
404/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
405static int
406STALE_CLIENTID(clientid_t *clid)
407{
408 if (clid->cl_boot == boot_time)
409 return 0;
410 dprintk("NFSD stale clientid (%08x/%08x)\n",
411 clid->cl_boot, clid->cl_id);
412 return 1;
413}
414
415/*
416 * XXX Should we use a slab cache ?
417 * This type of memory management is somewhat inefficient, but we use it
418 * anyway since SETCLIENTID is not a common operation.
419 */
35bba9a3 420static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 421{
422 struct nfs4_client *clp;
423
35bba9a3
BF		 424 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
425 if (clp == NULL)
426 return NULL;
427 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
428 if (clp->cl_name.data == NULL) {
429 kfree(clp);
430 return NULL;
1da177e4 431 }
35bba9a3
BF		 432 memcpy(clp->cl_name.data, name.data, name.len);
433 clp->cl_name.len = name.len;
1da177e4
LT		 434 return clp;
435}
436
1b1a9b31
BF		 437static void
438shutdown_callback_client(struct nfs4_client *clp)
439{
440 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
441
1b1a9b31 442 if (clnt) {
404ec117
BF		 443 /*
444 * Callback threads take a reference on the client, so there
445 * should be no outstanding callbacks at this point.
446 */
1b1a9b31
BF		 447 clp->cl_callback.cb_client = NULL;
448 rpc_shutdown_client(clnt);
449 }
450}
451
1da177e4
LT		 452static inline void
453free_client(struct nfs4_client *clp)
454{
1b1a9b31 455 shutdown_callback_client(clp);
1da177e4
LT		 456 if (clp->cl_cred.cr_group_info)
457 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 458 kfree(clp->cl_principal);
1da177e4
LT		 459 kfree(clp->cl_name.data);
460 kfree(clp);
461}
462
463void
464put_nfs4_client(struct nfs4_client *clp)
465{
466 if (atomic_dec_and_test(&clp->cl_count))
467 free_client(clp);
468}
469
470static void
471expire_client(struct nfs4_client *clp)
472{
473 struct nfs4_stateowner *sop;
474 struct nfs4_delegation *dp;
1da177e4
LT		 475 struct list_head reaplist;
476
477 dprintk("NFSD: expire_client cl_count %d\n",
478 atomic_read(&clp->cl_count));
479
1da177e4
LT		 480 INIT_LIST_HEAD(&reaplist);
481 spin_lock(&recall_lock);
ea1da636
N		 482 while (!list_empty(&clp->cl_delegations)) {
483 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 484 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
485 dp->dl_flock);
ea1da636 486 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 487 list_move(&dp->dl_recall_lru, &reaplist);
488 }
489 spin_unlock(&recall_lock);
490 while (!list_empty(&reaplist)) {
491 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
492 list_del_init(&dp->dl_recall_lru);
493 unhash_delegation(dp);
494 }
495 list_del(&clp->cl_idhash);
496 list_del(&clp->cl_strhash);
497 list_del(&clp->cl_lru);
ea1da636
N		 498 while (!list_empty(&clp->cl_openowners)) {
499 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 500 release_openowner(sop);
1da177e4
LT		 501 }
502 put_nfs4_client(clp);
503}
504
35bba9a3
BF		 505static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
506{
1da177e4
LT		 507 struct nfs4_client *clp;
508
35bba9a3
BF		 509 clp = alloc_client(name);
510 if (clp == NULL)
511 return NULL;
a55370a3 512 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 513 atomic_set(&clp->cl_count, 1);
514 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 515 INIT_LIST_HEAD(&clp->cl_idhash);
516 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 517 INIT_LIST_HEAD(&clp->cl_openowners);
518 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 519 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 520 return clp;
521}
522
35bba9a3
BF		 523static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
524{
525 memcpy(target->cl_verifier.data, source->data,
526 sizeof(target->cl_verifier.data));
1da177e4
LT		 527}
528
35bba9a3
BF		 529static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
530{
1da177e4
LT		 531 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
532 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
533}
534
35bba9a3
BF		 535static void copy_cred(struct svc_cred *target, struct svc_cred *source)
536{
1da177e4
LT		 537 target->cr_uid = source->cr_uid;
538 target->cr_gid = source->cr_gid;
539 target->cr_group_info = source->cr_group_info;
540 get_group_info(target->cr_group_info);
541}
542
35bba9a3 543static int same_name(const char *n1, const char *n2)
599e0a22 544{
a55370a3 545 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 546}
547
548static int
599e0a22
BF		 549same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
550{
551 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 552}
553
554static int
599e0a22
BF		 555same_clid(clientid_t *cl1, clientid_t *cl2)
556{
557 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 558}
559
560/* XXX what about NGROUP */
561static int
599e0a22
BF		 562same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
563{
564 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 565}
566
5ec7b46c
BF		 567static void gen_clid(struct nfs4_client *clp)
568{
569 static u32 current_clientid = 1;
570
1da177e4
LT		 571 clp->cl_clientid.cl_boot = boot_time;
572 clp->cl_clientid.cl_id = current_clientid++;
573}
574
deda2faa
BF		 575static void gen_confirm(struct nfs4_client *clp)
576{
577 static u32 i;
578 u32 *p;
1da177e4 579
1da177e4 580 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 581 *p++ = get_seconds();
582 *p++ = i++;
1da177e4
LT		 583}
584
35bba9a3
BF		 585static int check_name(struct xdr_netobj name)
586{
1da177e4
LT		 587 if (name.len == 0)
588 return 0;
589 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 590 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 591 return 0;
592 }
593 return 1;
594}
595
fd39ca9a 596static void
1da177e4
LT		 597add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
598{
599 unsigned int idhashval;
600
601 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
602 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
603 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
604 list_add_tail(&clp->cl_lru, &client_lru);
605 clp->cl_time = get_seconds();
606}
607
fd39ca9a 608static void
1da177e4
LT		 609move_to_confirmed(struct nfs4_client *clp)
610{
611 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
612 unsigned int strhashval;
613
614 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
615 list_del_init(&clp->cl_strhash);
f116629d 616 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 617 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 618 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
619 renew_client(clp);
620}
621
622static struct nfs4_client *
623find_confirmed_client(clientid_t *clid)
624{
625 struct nfs4_client *clp;
626 unsigned int idhashval = clientid_hashval(clid->cl_id);
627
628 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 629 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 630 return clp;
631 }
632 return NULL;
633}
634
635static struct nfs4_client *
636find_unconfirmed_client(clientid_t *clid)
637{
638 struct nfs4_client *clp;
639 unsigned int idhashval = clientid_hashval(clid->cl_id);
640
641 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 642 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 643 return clp;
644 }
645 return NULL;
646}
647
28ce6054
N		 648static struct nfs4_client *
649find_confirmed_client_by_str(const char *dname, unsigned int hashval)
650{
651 struct nfs4_client *clp;
652
653 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
654 if (same_name(clp->cl_recdir, dname))
655 return clp;
656 }
657 return NULL;
658}
659
660static struct nfs4_client *
661find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
662{
663 struct nfs4_client *clp;
664
665 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
666 if (same_name(clp->cl_recdir, dname))
667 return clp;
668 }
669 return NULL;
670}
671
1da177e4
LT		 672/* a helper function for parse_callback */
673static int
674parse_octet(unsigned int *lenp, char **addrp)
675{
676 unsigned int len = *lenp;
677 char *p = *addrp;
678 int n = -1;
679 char c;
680
681 for (;;) {
682 if (!len)
683 break;
684 len--;
685 c = *p++;
686 if (c == '.')
687 break;
688 if ((c < '0') || (c > '9')) {
689 n = -1;
690 break;
691 }
692 if (n < 0)
693 n = 0;
694 n = (n * 10) + (c - '0');
695 if (n > 255) {
696 n = -1;
697 break;
698 }
699 }
700 *lenp = len;
701 *addrp = p;
702 return n;
703}
704
705/* parse and set the setclientid ipv4 callback address */
fd39ca9a 706static int
1da177e4
LT		 707parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
708{
709 int temp = 0;
710 u32 cbaddr = 0;
711 u16 cbport = 0;
712 u32 addrlen = addr_len;
713 char *addr = addr_val;
714 int i, shift;
715
716 /* ipaddress */
717 shift = 24;
718 for(i = 4; i > 0 ; i--) {
719 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
720 return 0;
721 }
722 cbaddr |= (temp << shift);
723 if (shift > 0)
724 shift -= 8;
725 }
726 *cbaddrp = cbaddr;
727
728 /* port */
729 shift = 8;
730 for(i = 2; i > 0 ; i--) {
731 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
732 return 0;
733 }
734 cbport |= (temp << shift);
735 if (shift > 0)
736 shift -= 8;
737 }
738 *cbportp = cbport;
739 return 1;
740}
741
fd39ca9a 742static void
1da177e4
LT		 743gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
744{
745 struct nfs4_callback *cb = &clp->cl_callback;
746
747 /* Currently, we only support tcp for the callback channel */
748 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
749 goto out_err;
750
751 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
752 &cb->cb_addr, &cb->cb_port)))
753 goto out_err;
754 cb->cb_prog = se->se_callback_prog;
755 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 756 return;
757out_err:
849823c5 758 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 759 "will not receive delegations\n",
760 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
761
1da177e4
LT		 762 return;
763}
764
b37ad28b 765__be32
b591480b
BF		 766nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
767 struct nfsd4_setclientid *setclid)
1da177e4 768{
27459f09 769 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 770 struct xdr_netobj clname = {
771 .len = setclid->se_namelen,
772 .data = setclid->se_name,
773 };
774 nfs4_verifier clverifier = setclid->se_verf;
775 unsigned int strhashval;
28ce6054 776 struct nfs4_client *conf, *unconf, *new;
b37ad28b 777 __be32 status;
68e76ad0 778 char *princ;
a55370a3 779 char dname[HEXDIR_LEN];
1da177e4 780
1da177e4 781 if (!check_name(clname))
73aea4ec 782 return nfserr_inval;
1da177e4 783
a55370a3
N		 784 status = nfs4_make_rec_clidname(dname, &clname);
785 if (status)
73aea4ec 786 return status;
a55370a3 787
1da177e4
LT		 788 /*
789 * XXX The Duplicate Request Cache (DRC) has been checked (??)
790 * We get here on a DRC miss.
791 */
792
a55370a3 793 strhashval = clientstr_hashval(dname);
1da177e4 794
1da177e4 795 nfs4_lock_state();
28ce6054
N		 796 conf = find_confirmed_client_by_str(dname, strhashval);
797 if (conf) {
a186e767 798 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 799 status = nfserr_clid_inuse;
599e0a22 800 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 801 || conf->cl_addr != sin->sin_addr.s_addr) {
be859405
HH		 802 dprintk("NFSD: setclientid: string in use by clientat %pI4\n",
803 &conf->cl_addr);
1da177e4
LT		 804 goto out;
805 }
1da177e4 806 }
a186e767
BF		 807 /*
808 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
809 * has a description of SETCLIENTID request processing consisting
810 * of 5 bullet points, labeled as CASE0 - CASE4 below.
811 */
28ce6054 812 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 813 status = nfserr_resource;
814 if (!conf) {
a186e767
BF		 815 /*
816 * RFC 3530 14.2.33 CASE 4:
817 * placed first, because it is the normal case
1da177e4
LT		 818 */
819 if (unconf)
820 expire_client(unconf);
a55370a3
N		 821 new = create_client(clname, dname);
822 if (new == NULL)
1da177e4 823 goto out;
1da177e4 824 gen_clid(new);
599e0a22 825 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 826 /*
a186e767
BF		 827 * RFC 3530 14.2.33 CASE 1:
828 * probable callback update
1da177e4 829 */
31f4a6c1
N		 830 if (unconf) {
831 /* Note this is removing unconfirmed {*x***},
832 * which is stronger than RFC recommended {vxc**}.
833 * This has the advantage that there is at most
834 * one {*x***} in either list at any time.
835 */
836 expire_client(unconf);
1da177e4 837 }
a55370a3
N		 838 new = create_client(clname, dname);
839 if (new == NULL)
1da177e4 840 goto out;
1da177e4 841 copy_clid(new, conf);
1da177e4
LT		 842 } else if (!unconf) {
843 /*
a186e767
BF		 844 * RFC 3530 14.2.33 CASE 2:
845 * probable client reboot; state will be removed if
846 * confirmed.
1da177e4 847 */
a55370a3
N		 848 new = create_client(clname, dname);
849 if (new == NULL)
1da177e4 850 goto out;
1da177e4 851 gen_clid(new);
49ba8781 852 } else {
a186e767
BF		 853 /*
854 * RFC 3530 14.2.33 CASE 3:
855 * probable client reboot; state will be removed if
856 * confirmed.
1da177e4
LT		 857 */
858 expire_client(unconf);
a55370a3
N		 859 new = create_client(clname, dname);
860 if (new == NULL)
1da177e4 861 goto out;
1da177e4 862 gen_clid(new);
1da177e4 863 }
c175b83c
BF		 864 copy_verf(new, &clverifier);
865 new->cl_addr = sin->sin_addr.s_addr;
61054b14 866 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 867 princ = svc_gss_principal(rqstp);
868 if (princ) {
869 new->cl_principal = kstrdup(princ, GFP_KERNEL);
870 if (new->cl_principal == NULL) {
871 free_client(new);
872 goto out;
873 }
874 }
c175b83c
BF		 875 copy_cred(&new->cl_cred, &rqstp->rq_cred);
876 gen_confirm(new);
877 gen_callback(new, setclid);
878 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 879 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
880 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
881 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
882 status = nfs_ok;
883out:
884 nfs4_unlock_state();
885 return status;
886}
887
888
889/*
a186e767
BF		 890 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
891 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
892 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 893 */
b37ad28b 894__be32
b591480b
BF		 895nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
896 struct nfsd4_compound_state *cstate,
897 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 898{
27459f09 899 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 900 struct nfs4_client *conf, *unconf;
1da177e4
LT		 901 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
902 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 903 __be32 status;
1da177e4
LT		 904
905 if (STALE_CLIENTID(clid))
906 return nfserr_stale_clientid;
907 /*
908 * XXX The Duplicate Request Cache (DRC) has been checked (??)
909 * We get here on a DRC miss.
910 */
911
912 nfs4_lock_state();
21ab45a4
N		 913
914 conf = find_confirmed_client(clid);
915 unconf = find_unconfirmed_client(clid);
916
917 status = nfserr_clid_inuse;
27459f09 918 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 919 goto out;
27459f09 920 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 921 goto out;
922
a186e767
BF		 923 /*
924 * section 14.2.34 of RFC 3530 has a description of
925 * SETCLIENTID_CONFIRM request processing consisting
926 * of 4 bullet points, labeled as CASE1 - CASE4 below.
927 */
366e0c1d 928 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 929 /*
930 * RFC 3530 14.2.34 CASE 1:
931 * callback update
932 */
599e0a22 933 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 934 status = nfserr_clid_inuse;
935 else {
1a69c179
N		 936 /* XXX: We just turn off callbacks until we can handle
937 * change request correctly. */
cb36d634 938 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 939 gen_confirm(conf);
46309029 940 nfsd4_remove_clid_dir(unconf);
1a69c179 941 expire_client(unconf);
1da177e4 942 status = nfs_ok;
1a69c179 943
1da177e4 944 }
f3aba4e5 945 } else if (conf && !unconf) {
a186e767
BF		 946 /*
947 * RFC 3530 14.2.34 CASE 2:
948 * probable retransmitted request; play it safe and
949 * do nothing.
7c79f737 950 */
599e0a22 951 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 952 status = nfserr_clid_inuse;
21ab45a4 953 else
1da177e4 954 status = nfs_ok;
7c79f737 955 } else if (!conf && unconf
599e0a22 956 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 957 /*
958 * RFC 3530 14.2.34 CASE 3:
959 * Normal case; new or rebooted client:
7c79f737 960 */
599e0a22 961 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 962 status = nfserr_clid_inuse;
963 } else {
1a69c179
N		 964 unsigned int hash =
965 clientstr_hashval(unconf->cl_recdir);
966 conf = find_confirmed_client_by_str(unconf->cl_recdir,
967 hash);
968 if (conf) {
c7b9a459 969 nfsd4_remove_clid_dir(conf);
1a69c179
N		 970 expire_client(conf);
971 }
1da177e4 972 move_to_confirmed(unconf);
21ab45a4 973 conf = unconf;
46f8a64b 974 nfsd4_probe_callback(conf);
1a69c179 975 status = nfs_ok;
1da177e4 976 }
599e0a22
BF		 977 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
978 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 979 &confirm)))) {
a186e767
BF		 980 /*
981 * RFC 3530 14.2.34 CASE 4:
982 * Client probably hasn't noticed that we rebooted yet.
7c79f737 983 */
1da177e4 984 status = nfserr_stale_clientid;
7c79f737 985 } else {
08e8987c
N		 986 /* check that we have hit one of the cases...*/
987 status = nfserr_clid_inuse;
988 }
1da177e4 989out:
1da177e4
LT		 990 nfs4_unlock_state();
991 return status;
992}
993
1da177e4
LT		 994/* OPEN Share state helper functions */
995static inline struct nfs4_file *
996alloc_init_file(struct inode *ino)
997{
998 struct nfs4_file *fp;
999 unsigned int hashval = file_hashval(ino);
1000
e60d4398
N		 1001 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1002 if (fp) {
13cd2184 1003 kref_init(&fp->fi_ref);
1da177e4 1004 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1005 INIT_LIST_HEAD(&fp->fi_stateids);
1006 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1007 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1008 fp->fi_inode = igrab(ino);
1009 fp->fi_id = current_fileid++;
47f9940c 1010 fp->fi_had_conflict = false;
1da177e4
LT		 1011 return fp;
1012 }
1013 return NULL;
1014}
1015
e60d4398 1016static void
e18b890b 1017nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1018{
e60d4398
N		 1019 if (*slab == NULL)
1020 return;
1a1d92c1 1021 kmem_cache_destroy(*slab);
e60d4398 1022 *slab = NULL;
1da177e4
LT		 1023}
1024
e8ff2a84 1025void
1da177e4
LT		 1026nfsd4_free_slabs(void)
1027{
e60d4398
N		 1028 nfsd4_free_slab(&stateowner_slab);
1029 nfsd4_free_slab(&file_slab);
5ac049ac 1030 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1031 nfsd4_free_slab(&deleg_slab);
e60d4398 1032}
1da177e4 1033
e60d4398
N		 1034static int
1035nfsd4_init_slabs(void)
1036{
1037 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1038 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1039 if (stateowner_slab == NULL)
1040 goto out_nomem;
1041 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1042 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1043 if (file_slab == NULL)
1044 goto out_nomem;
5ac049ac 1045 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1046 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1047 if (stateid_slab == NULL)
1048 goto out_nomem;
5b2d21c1 1049 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1050 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1051 if (deleg_slab == NULL)
1052 goto out_nomem;
e60d4398
N		 1053 return 0;
1054out_nomem:
1055 nfsd4_free_slabs();
1056 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1057 return -ENOMEM;
1da177e4
LT		 1058}
1059
1060void
1061nfs4_free_stateowner(struct kref *kref)
1062{
1063 struct nfs4_stateowner *sop =
1064 container_of(kref, struct nfs4_stateowner, so_ref);
1065 kfree(sop->so_owner.data);
1066 kmem_cache_free(stateowner_slab, sop);
1067}
1068
1069static inline struct nfs4_stateowner *
1070alloc_stateowner(struct xdr_netobj *owner)
1071{
1072 struct nfs4_stateowner *sop;
1073
1074 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1075 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1076 memcpy(sop->so_owner.data, owner->data, owner->len);
1077 sop->so_owner.len = owner->len;
1078 kref_init(&sop->so_ref);
1079 return sop;
1080 }
1081 kmem_cache_free(stateowner_slab, sop);
1082 }
1083 return NULL;
1084}
1085
1086static struct nfs4_stateowner *
1087alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1088 struct nfs4_stateowner *sop;
1089 struct nfs4_replay *rp;
1090 unsigned int idhashval;
1091
1092 if (!(sop = alloc_stateowner(&open->op_owner)))
1093 return NULL;
1094 idhashval = ownerid_hashval(current_ownerid);
1095 INIT_LIST_HEAD(&sop->so_idhash);
1096 INIT_LIST_HEAD(&sop->so_strhash);
1097 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1098 INIT_LIST_HEAD(&sop->so_stateids);
1099 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1100 INIT_LIST_HEAD(&sop->so_close_lru);
1101 sop->so_time = 0;
1102 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1103 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1104 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1105 sop->so_is_open_owner = 1;
1106 sop->so_id = current_ownerid++;
1107 sop->so_client = clp;
1108 sop->so_seqid = open->op_seqid;
1109 sop->so_confirmed = 0;
1110 rp = &sop->so_replay;
de1ae286 1111 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1112 rp->rp_buflen = 0;
1113 rp->rp_buf = rp->rp_ibuf;
1114 return sop;
1115}
1116
1da177e4
LT		 1117static inline void
1118init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1119 struct nfs4_stateowner *sop = open->op_stateowner;
1120 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1121
1122 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1123 INIT_LIST_HEAD(&stp->st_perstateowner);
1124 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1125 INIT_LIST_HEAD(&stp->st_perfile);
1126 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1127 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1128 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1129 stp->st_stateowner = sop;
13cd2184 1130 get_nfs4_file(fp);
1da177e4
LT		 1131 stp->st_file = fp;
1132 stp->st_stateid.si_boot = boot_time;
1133 stp->st_stateid.si_stateownerid = sop->so_id;
1134 stp->st_stateid.si_fileid = fp->fi_id;
1135 stp->st_stateid.si_generation = 0;
1136 stp->st_access_bmap = 0;
1137 stp->st_deny_bmap = 0;
1138 __set_bit(open->op_share_access, &stp->st_access_bmap);
1139 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1140 stp->st_openstp = NULL;
1da177e4
LT		 1141}
1142
fd39ca9a 1143static void
1da177e4
LT		 1144move_to_close_lru(struct nfs4_stateowner *sop)
1145{
1146 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1147
358dd55a 1148 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1149 sop->so_time = get_seconds();
1150}
1151
1da177e4 1152static int
599e0a22
BF		 1153same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1154 clientid_t *clid)
1155{
1156 return (sop->so_owner.len == owner->len) &&
1157 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1158 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1159}
1160
1161static struct nfs4_stateowner *
1162find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1163{
1164 struct nfs4_stateowner *so = NULL;
1165
1166 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1167 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1168 return so;
1169 }
1170 return NULL;
1171}
1172
1173/* search file_hashtbl[] for file */
1174static struct nfs4_file *
1175find_file(struct inode *ino)
1176{
1177 unsigned int hashval = file_hashval(ino);
1178 struct nfs4_file *fp;
1179
1180 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1181 if (fp->fi_inode == ino) {
1182 get_nfs4_file(fp);
1da177e4 1183 return fp;
13cd2184 1184 }
1da177e4
LT		 1185 }
1186 return NULL;
1187}
1188
8838dc43 1189static inline int access_valid(u32 x)
ba5a6a19 1190{
8838dc43
BF		 1191 if (x < NFS4_SHARE_ACCESS_READ)
1192 return 0;
1193 if (x > NFS4_SHARE_ACCESS_BOTH)
1194 return 0;
1195 return 1;
ba5a6a19
BF		 1196}
1197
8838dc43 1198static inline int deny_valid(u32 x)
ba5a6a19 1199{
8838dc43
BF		 1200 /* Note: unlike access bits, deny bits may be zero. */
1201 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1202}
1da177e4 1203
4f83aa30
BF		 1204/*
1205 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1206 * st_{access,deny}_bmap field of the stateid, in order to track not
1207 * only what share bits are currently in force, but also what
1208 * combinations of share bits previous opens have used. This allows us
1209 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1210 * return an error if the client attempt to downgrade to a combination
1211 * of share bits not explicable by closing some of its previous opens.
1212 *
1213 * XXX: This enforcement is actually incomplete, since we don't keep
1214 * track of access/deny bit combinations; so, e.g., we allow:
1215 *
1216 * OPEN allow read, deny write
1217 * OPEN allow both, deny none
1218 * DOWNGRADE allow read, deny none
1219 *
1220 * which we should reject.
1221 */
fd39ca9a 1222static void
1da177e4
LT		 1223set_access(unsigned int *access, unsigned long bmap) {
1224 int i;
1225
1226 *access = 0;
1227 for (i = 1; i < 4; i++) {
1228 if (test_bit(i, &bmap))
1229 *access |= i;
1230 }
1231}
1232
fd39ca9a 1233static void
1da177e4
LT		 1234set_deny(unsigned int *deny, unsigned long bmap) {
1235 int i;
1236
1237 *deny = 0;
1238 for (i = 0; i < 4; i++) {
1239 if (test_bit(i, &bmap))
1240 *deny |= i ;
1241 }
1242}
1243
1244static int
1245test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1246 unsigned int access, deny;
1247
1248 set_access(&access, stp->st_access_bmap);
1249 set_deny(&deny, stp->st_deny_bmap);
1250 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1251 return 0;
1252 return 1;
1253}
1254
1255/*
1256 * Called to check deny when READ with all zero stateid or
1257 * WRITE with all zero or all one stateid
1258 */
b37ad28b 1259static __be32
1da177e4
LT		 1260nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1261{
1262 struct inode *ino = current_fh->fh_dentry->d_inode;
1263 struct nfs4_file *fp;
1264 struct nfs4_stateid *stp;
b37ad28b 1265 __be32 ret;
1da177e4
LT		 1266
1267 dprintk("NFSD: nfs4_share_conflict\n");
1268
1269 fp = find_file(ino);
13cd2184
N		 1270 if (!fp)
1271 return nfs_ok;
b700949b 1272 ret = nfserr_locked;
1da177e4 1273 /* Search for conflicting share reservations */
13cd2184
N		 1274 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1275 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1276 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1277 goto out;
1da177e4 1278 }
13cd2184
N		 1279 ret = nfs_ok;
1280out:
1281 put_nfs4_file(fp);
1282 return ret;
1da177e4
LT		 1283}
1284
1285static inline void
1286nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1287{
1288 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1289 drop_file_write_access(filp);
1da177e4
LT		 1290 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1291 }
1292}
1293
1294/*
1295 * Recall a delegation
1296 */
1297static int
1298do_recall(void *__dp)
1299{
1300 struct nfs4_delegation *dp = __dp;
1301
47f9940c 1302 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1303 nfsd4_cb_recall(dp);
1304 return 0;
1305}
1306
1307/*
1308 * Spawn a thread to perform a recall on the delegation represented
1309 * by the lease (file_lock)
1310 *
1311 * Called from break_lease() with lock_kernel() held.
1312 * Note: we assume break_lease will only call this *once* for any given
1313 * lease.
1314 */
1315static
1316void nfsd_break_deleg_cb(struct file_lock *fl)
1317{
1318 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1319 struct task_struct *t;
1320
1321 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1322 if (!dp)
1323 return;
1324
1325 /* We're assuming the state code never drops its reference
1326 * without first removing the lease. Since we're in this lease
1327 * callback (and since the lease code is serialized by the kernel
1328 * lock) we know the server hasn't removed the lease yet, we know
1329 * it's safe to take a reference: */
1330 atomic_inc(&dp->dl_count);
cfdcad4d 1331 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1332
1333 spin_lock(&recall_lock);
1334 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1335 spin_unlock(&recall_lock);
1336
1337 /* only place dl_time is set. protected by lock_kernel*/
1338 dp->dl_time = get_seconds();
1339
0272e1fd
BF		 1340 /*
1341 * We don't want the locks code to timeout the lease for us;
1342 * we'll remove it ourself if the delegation isn't returned
1343 * in time.
1344 */
1345 fl->fl_break_time = 0;
1da177e4
LT		 1346
1347 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1348 if (IS_ERR(t)) {
1349 struct nfs4_client *clp = dp->dl_client;
1350
1351 printk(KERN_INFO "NFSD: Callback thread failed for "
1352 "for client (clientid %08x/%08x)\n",
1353 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1354 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1355 nfs4_put_delegation(dp);
1356 }
1357}
1358
1359/*
1360 * The file_lock is being reapd.
1361 *
1362 * Called by locks_free_lock() with lock_kernel() held.
1363 */
1364static
1365void nfsd_release_deleg_cb(struct file_lock *fl)
1366{
1367 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1368
1369 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1370
1371 if (!(fl->fl_flags & FL_LEASE) || !dp)
1372 return;
1373 dp->dl_flock = NULL;
1374}
1375
1376/*
1377 * Set the delegation file_lock back pointer.
1378 *
a9933cea 1379 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1380 */
1381static
1382void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1383{
1384 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1385
1386 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1387 if (!dp)
1388 return;
1389 dp->dl_flock = new;
1390}
1391
1392/*
a9933cea 1393 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1394 */
1395static
1396int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1397{
1398 struct nfs4_delegation *onlistd =
1399 (struct nfs4_delegation *)onlist->fl_owner;
1400 struct nfs4_delegation *tryd =
1401 (struct nfs4_delegation *)try->fl_owner;
1402
1403 if (onlist->fl_lmops != try->fl_lmops)
1404 return 0;
1405
1406 return onlistd->dl_client == tryd->dl_client;
1407}
1408
1409
1410static
1411int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1412{
1413 if (arg & F_UNLCK)
1414 return lease_modify(onlist, arg);
1415 else
1416 return -EAGAIN;
1417}
1418
fd39ca9a 1419static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1420 .fl_break = nfsd_break_deleg_cb,
1421 .fl_release_private = nfsd_release_deleg_cb,
1422 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1423 .fl_mylease = nfsd_same_client_deleg_cb,
1424 .fl_change = nfsd_change_deleg_cb,
1425};
1426
1427
b37ad28b 1428__be32
1da177e4
LT		 1429nfsd4_process_open1(struct nfsd4_open *open)
1430{
1da177e4
LT		 1431 clientid_t *clientid = &open->op_clientid;
1432 struct nfs4_client *clp = NULL;
1433 unsigned int strhashval;
1434 struct nfs4_stateowner *sop = NULL;
1435
1da177e4 1436 if (!check_name(open->op_owner))
0f442aa2 1437 return nfserr_inval;
1da177e4
LT		 1438
1439 if (STALE_CLIENTID(&open->op_clientid))
1440 return nfserr_stale_clientid;
1441
1442 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1443 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1444 open->op_stateowner = sop;
1445 if (!sop) {
1446 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1447 clp = find_confirmed_client(clientid);
1448 if (clp == NULL)
0f442aa2
BF		 1449 return nfserr_expired;
1450 goto renew;
1da177e4 1451 }
0f442aa2
BF		 1452 if (!sop->so_confirmed) {
1453 /* Replace unconfirmed owners without checking for replay. */
1454 clp = sop->so_client;
f044ff83 1455 release_openowner(sop);
0f442aa2
BF		 1456 open->op_stateowner = NULL;
1457 goto renew;
1458 }
1459 if (open->op_seqid == sop->so_seqid - 1) {
1460 if (sop->so_replay.rp_buflen)
a90b061c 1461 return nfserr_replay_me;
0f442aa2
BF		 1462 /* The original OPEN failed so spectacularly
1463 * that we don't even have replay data saved!
1464 * Therefore, we have no choice but to continue
1465 * processing this OPEN; presumably, we'll
1466 * fail again for the same reason.
1467 */
1468 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1469 goto renew;
1470 }
1471 if (open->op_seqid != sop->so_seqid)
1472 return nfserr_bad_seqid;
1da177e4 1473renew:
0f442aa2
BF		 1474 if (open->op_stateowner == NULL) {
1475 sop = alloc_init_open_stateowner(strhashval, clp, open);
1476 if (sop == NULL)
1477 return nfserr_resource;
1478 open->op_stateowner = sop;
1479 }
1480 list_del_init(&sop->so_close_lru);
1da177e4 1481 renew_client(sop->so_client);
0f442aa2 1482 return nfs_ok;
1da177e4
LT		 1483}
1484
b37ad28b 1485static inline __be32
4a6e43e6
N		 1486nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1487{
1488 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1489 return nfserr_openmode;
1490 else
1491 return nfs_ok;
1492}
1493
52f4fb43
N		 1494static struct nfs4_delegation *
1495find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1496{
1497 struct nfs4_delegation *dp;
1498
ea1da636 1499 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1500 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1501 return dp;
1502 }
1503 return NULL;
1504}
1505
b37ad28b 1506static __be32
567d9829
N		 1507nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1508 struct nfs4_delegation **dp)
1509{
1510 int flags;
b37ad28b 1511 __be32 status = nfserr_bad_stateid;
567d9829
N		 1512
1513 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1514 if (*dp == NULL)
c44c5eeb 1515 goto out;
567d9829
N		 1516 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1517 RD_STATE : WR_STATE;
1518 status = nfs4_check_delegmode(*dp, flags);
1519 if (status)
1520 *dp = NULL;
c44c5eeb
N		 1521out:
1522 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1523 return nfs_ok;
1524 if (status)
1525 return status;
1526 open->op_stateowner->so_confirmed = 1;
1527 return nfs_ok;
567d9829
N		 1528}
1529
b37ad28b 1530static __be32
1da177e4
LT		 1531nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1532{
1533 struct nfs4_stateid *local;
b37ad28b 1534 __be32 status = nfserr_share_denied;
1da177e4
LT		 1535 struct nfs4_stateowner *sop = open->op_stateowner;
1536
8beefa24 1537 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1538 /* ignore lock owners */
1539 if (local->st_stateowner->so_is_open_owner == 0)
1540 continue;
1541 /* remember if we have seen this open owner */
1542 if (local->st_stateowner == sop)
1543 *stpp = local;
1544 /* check for conflicting share reservations */
1545 if (!test_share(local, open))
1546 goto out;
1547 }
1548 status = 0;
1549out:
1550 return status;
1551}
1552
5ac049ac
N		 1553static inline struct nfs4_stateid *
1554nfs4_alloc_stateid(void)
1555{
1556 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1557}
1558
b37ad28b 1559static __be32
1da177e4 1560nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1561 struct nfs4_delegation *dp,
1da177e4
LT		 1562 struct svc_fh *cur_fh, int flags)
1563{
1564 struct nfs4_stateid *stp;
1da177e4 1565
5ac049ac 1566 stp = nfs4_alloc_stateid();
1da177e4
LT		 1567 if (stp == NULL)
1568 return nfserr_resource;
1569
567d9829
N		 1570 if (dp) {
1571 get_file(dp->dl_vfs_file);
1572 stp->st_vfs_file = dp->dl_vfs_file;
1573 } else {
b37ad28b 1574 __be32 status;
567d9829
N		 1575 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1576 &stp->st_vfs_file);
1577 if (status) {
1578 if (status == nfserr_dropit)
1579 status = nfserr_jukebox;
5ac049ac 1580 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1581 return status;
1582 }
1da177e4 1583 }
1da177e4
LT		 1584 *stpp = stp;
1585 return 0;
1586}
1587
b37ad28b 1588static inline __be32
1da177e4
LT		 1589nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1590 struct nfsd4_open *open)
1591{
1592 struct iattr iattr = {
1593 .ia_valid = ATTR_SIZE,
1594 .ia_size = 0,
1595 };
1596 if (!open->op_truncate)
1597 return 0;
1598 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1599 return nfserr_inval;
1da177e4
LT		 1600 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1601}
1602
b37ad28b 1603static __be32
1da177e4
LT		 1604nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1605{
1606 struct file *filp = stp->st_vfs_file;
7eaa36e2 1607 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1608 unsigned int share_access, new_writer;
b37ad28b 1609 __be32 status;
1da177e4
LT		 1610
1611 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1612 new_writer = (~share_access) & open->op_share_access
1613 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1614
6c26d08f 1615 if (new_writer) {
b37ad28b
AV		 1616 int err = get_write_access(inode);
1617 if (err)
1618 return nfserrno(err);
e518f056
BH		 1619 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1620 if (err)
1621 return nfserrno(err);
1622 file_take_write(filp);
6c26d08f 1623 }
1da177e4
LT		 1624 status = nfsd4_truncate(rqstp, cur_fh, open);
1625 if (status) {
6c26d08f
BF		 1626 if (new_writer)
1627 put_write_access(inode);
1da177e4
LT		 1628 return status;
1629 }
1630 /* remember the open */
6c26d08f 1631 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1632 __set_bit(open->op_share_access, &stp->st_access_bmap);
1633 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1634
1635 return nfs_ok;
1636}
1637
1638
1da177e4 1639static void
37515177 1640nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1641{
37515177
N		 1642 open->op_stateowner->so_confirmed = 1;
1643 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1644}
1645
1646/*
1647 * Attempt to hand out a delegation.
1648 */
1649static void
1650nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1651{
1652 struct nfs4_delegation *dp;
1653 struct nfs4_stateowner *sop = stp->st_stateowner;
1654 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1655 struct file_lock fl, *flp = &fl;
1656 int status, flag = 0;
1657
1658 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1659 open->op_recall = 0;
1660 switch (open->op_claim_type) {
1661 case NFS4_OPEN_CLAIM_PREVIOUS:
1662 if (!atomic_read(&cb->cb_set))
1663 open->op_recall = 1;
1664 flag = open->op_delegate_type;
1665 if (flag == NFS4_OPEN_DELEGATE_NONE)
1666 goto out;
1667 break;
1668 case NFS4_OPEN_CLAIM_NULL:
1669 /* Let's not give out any delegations till everyone's
1670 * had the chance to reclaim theirs.... */
af558e33 1671 if (locks_in_grace())
7b190fec
N		 1672 goto out;
1673 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1674 goto out;
1675 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1676 flag = NFS4_OPEN_DELEGATE_WRITE;
1677 else
1678 flag = NFS4_OPEN_DELEGATE_READ;
1679 break;
1680 default:
1681 goto out;
1682 }
1da177e4
LT		 1683
1684 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1685 if (dp == NULL) {
1686 flag = NFS4_OPEN_DELEGATE_NONE;
1687 goto out;
1688 }
1689 locks_init_lock(&fl);
1690 fl.fl_lmops = &nfsd_lease_mng_ops;
1691 fl.fl_flags = FL_LEASE;
9167f501 1692 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1693 fl.fl_end = OFFSET_MAX;
1694 fl.fl_owner = (fl_owner_t)dp;
1695 fl.fl_file = stp->st_vfs_file;
1696 fl.fl_pid = current->tgid;
1697
a9933cea 1698 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1699 * the lock_manager callbacks fl_mylease and fl_change are used
1700 */
9167f501 1701 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1702 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1703 unhash_delegation(dp);
1da177e4
LT		 1704 flag = NFS4_OPEN_DELEGATE_NONE;
1705 goto out;
1706 }
1707
1708 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1709
1710 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1711 dp->dl_stateid.si_boot,
1712 dp->dl_stateid.si_stateownerid,
1713 dp->dl_stateid.si_fileid,
1714 dp->dl_stateid.si_generation);
1715out:
7b190fec
N		 1716 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1717 && flag == NFS4_OPEN_DELEGATE_NONE
1718 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1719 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1720 open->op_delegate_type = flag;
1721}
1722
1723/*
1724 * called with nfs4_lock_state() held.
1725 */
b37ad28b 1726__be32
1da177e4
LT		 1727nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1728{
1729 struct nfs4_file *fp = NULL;
1730 struct inode *ino = current_fh->fh_dentry->d_inode;
1731 struct nfs4_stateid *stp = NULL;
567d9829 1732 struct nfs4_delegation *dp = NULL;
b37ad28b 1733 __be32 status;
1da177e4
LT		 1734
1735 status = nfserr_inval;
ba5a6a19
BF		 1736 if (!access_valid(open->op_share_access)
1737 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1738 goto out;
1739 /*
1740 * Lookup file; if found, lookup stateid and check open request,
1741 * and check for delegations in the process of being recalled.
1742 * If not found, create the nfs4_file struct
1743 */
1744 fp = find_file(ino);
1745 if (fp) {
1746 if ((status = nfs4_check_open(fp, open, &stp)))
1747 goto out;
c44c5eeb
N		 1748 status = nfs4_check_deleg(fp, open, &dp);
1749 if (status)
1750 goto out;
1da177e4 1751 } else {
c44c5eeb
N		 1752 status = nfserr_bad_stateid;
1753 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1754 goto out;
1da177e4
LT		 1755 status = nfserr_resource;
1756 fp = alloc_init_file(ino);
1757 if (fp == NULL)
1758 goto out;
1759 }
1760
1761 /*
1762 * OPEN the file, or upgrade an existing OPEN.
1763 * If truncate fails, the OPEN fails.
1764 */
1765 if (stp) {
1766 /* Stateid was found, this is an OPEN upgrade */
1767 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1768 if (status)
1769 goto out;
444c2c07 1770 update_stateid(&stp->st_stateid);
1da177e4
LT		 1771 } else {
1772 /* Stateid was not found, this is a new OPEN */
1773 int flags = 0;
9ecb6a08 1774 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 1775 flags |= NFSD_MAY_READ;
1da177e4 1776 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 1777 flags |= NFSD_MAY_WRITE;
567d9829
N		 1778 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1779 if (status)
1da177e4
LT		 1780 goto out;
1781 init_stateid(stp, fp, open);
1782 status = nfsd4_truncate(rqstp, current_fh, open);
1783 if (status) {
2283963f 1784 release_open_stateid(stp);
1da177e4
LT		 1785 goto out;
1786 }
1787 }
1788 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1789
1790 /*
1791 * Attempt to hand out a delegation. No error return, because the
1792 * OPEN succeeds even if we fail.
1793 */
1794 nfs4_open_delegation(current_fh, open, stp);
1795
1796 status = nfs_ok;
1797
1798 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1799 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1800 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1801out:
13cd2184
N		 1802 if (fp)
1803 put_nfs4_file(fp);
37515177
N		 1804 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1805 nfs4_set_claim_prev(open);
1da177e4
LT		 1806 /*
1807 * To finish the open response, we just need to set the rflags.
1808 */
1809 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1810 if (!open->op_stateowner->so_confirmed)
1811 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1812
1813 return status;
1814}
1815
b37ad28b 1816__be32
b591480b
BF		 1817nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1818 clientid_t *clid)
1da177e4
LT		 1819{
1820 struct nfs4_client *clp;
b37ad28b 1821 __be32 status;
1da177e4
LT		 1822
1823 nfs4_lock_state();
1824 dprintk("process_renew(%08x/%08x): starting\n",
1825 clid->cl_boot, clid->cl_id);
1826 status = nfserr_stale_clientid;
1827 if (STALE_CLIENTID(clid))
1828 goto out;
1829 clp = find_confirmed_client(clid);
1830 status = nfserr_expired;
1831 if (clp == NULL) {
1832 /* We assume the client took too long to RENEW. */
1833 dprintk("nfsd4_renew: clientid not found!\n");
1834 goto out;
1835 }
1836 renew_client(clp);
1837 status = nfserr_cb_path_down;
ea1da636 1838 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1839 && !atomic_read(&clp->cl_callback.cb_set))
1840 goto out;
1841 status = nfs_ok;
1842out:
1843 nfs4_unlock_state();
1844 return status;
1845}
1846
af558e33
BF		 1847struct lock_manager nfsd4_manager = {
1848};
1849
a76b4319 1850static void
af558e33 1851nfsd4_end_grace(void)
a76b4319
N		 1852{
1853 dprintk("NFSD: end of grace period\n");
c7b9a459 1854 nfsd4_recdir_purge_old();
af558e33 1855 locks_end_grace(&nfsd4_manager);
a76b4319
N		 1856}
1857
fd39ca9a 1858static time_t
1da177e4
LT		 1859nfs4_laundromat(void)
1860{
1861 struct nfs4_client *clp;
1862 struct nfs4_stateowner *sop;
1863 struct nfs4_delegation *dp;
1864 struct list_head *pos, *next, reaplist;
1865 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1866 time_t t, clientid_val = NFSD_LEASE_TIME;
1867 time_t u, test_val = NFSD_LEASE_TIME;
1868
1869 nfs4_lock_state();
1870
1871 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 1872 if (locks_in_grace())
1873 nfsd4_end_grace();
1da177e4
LT		 1874 list_for_each_safe(pos, next, &client_lru) {
1875 clp = list_entry(pos, struct nfs4_client, cl_lru);
1876 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1877 t = clp->cl_time - cutoff;
1878 if (clientid_val > t)
1879 clientid_val = t;
1880 break;
1881 }
1882 dprintk("NFSD: purging unused client (clientid %08x)\n",
1883 clp->cl_clientid.cl_id);
c7b9a459 1884 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1885 expire_client(clp);
1886 }
1887 INIT_LIST_HEAD(&reaplist);
1888 spin_lock(&recall_lock);
1889 list_for_each_safe(pos, next, &del_recall_lru) {
1890 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1891 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1892 u = dp->dl_time - cutoff;
1893 if (test_val > u)
1894 test_val = u;
1895 break;
1896 }
1897 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1898 dp, dp->dl_flock);
1899 list_move(&dp->dl_recall_lru, &reaplist);
1900 }
1901 spin_unlock(&recall_lock);
1902 list_for_each_safe(pos, next, &reaplist) {
1903 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1904 list_del_init(&dp->dl_recall_lru);
1905 unhash_delegation(dp);
1906 }
1907 test_val = NFSD_LEASE_TIME;
1908 list_for_each_safe(pos, next, &close_lru) {
1909 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1910 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1911 u = sop->so_time - cutoff;
1912 if (test_val > u)
1913 test_val = u;
1914 break;
1915 }
1916 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1917 sop->so_id);
f044ff83 1918 release_openowner(sop);
1da177e4
LT		 1919 }
1920 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1921 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1922 nfs4_unlock_state();
1923 return clientid_val;
1924}
1925
a254b246
HH		 1926static struct workqueue_struct *laundry_wq;
1927static void laundromat_main(struct work_struct *);
1928static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1929
1930static void
c4028958 1931laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1932{
1933 time_t t;
1934
1935 t = nfs4_laundromat();
1936 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1937 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1938}
1939
fd39ca9a 1940static struct nfs4_stateowner *
f8816512
N		 1941search_close_lru(u32 st_id, int flags)
1942{
1da177e4
LT		 1943 struct nfs4_stateowner *local = NULL;
1944
1da177e4
LT		 1945 if (flags & CLOSE_STATE) {
1946 list_for_each_entry(local, &close_lru, so_close_lru) {
1947 if (local->so_id == st_id)
1948 return local;
1949 }
1950 }
1951 return NULL;
1952}
1953
1954static inline int
1955nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1956{
7eaa36e2 1957 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1958}
1959
1960static int
1961STALE_STATEID(stateid_t *stateid)
1962{
1963 if (stateid->si_boot == boot_time)
1964 return 0;
849823c5 1965 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1966 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1967 stateid->si_generation);
1968 return 1;
1969}
1970
1971static inline int
1972access_permit_read(unsigned long access_bmap)
1973{
1974 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1975 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1976 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1977}
1978
1979static inline int
1980access_permit_write(unsigned long access_bmap)
1981{
1982 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1983 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1984}
1985
1986static
b37ad28b 1987__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1988{
b37ad28b 1989 __be32 status = nfserr_openmode;
1da177e4
LT		 1990
1991 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1992 goto out;
1993 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1994 goto out;
1995 status = nfs_ok;
1996out:
1997 return status;
1998}
1999
b37ad28b 2000static inline __be32
1da177e4
LT		 2001check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2002{
203a8c8e 2003 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2004 return nfs_ok;
af558e33 2005 else if (locks_in_grace()) {
1da177e4
LT		 2006 /* Answer in remaining cases depends on existance of
2007 * conflicting state; so we must wait out the grace period. */
2008 return nfserr_grace;
2009 } else if (flags & WR_STATE)
2010 return nfs4_share_conflict(current_fh,
2011 NFS4_SHARE_DENY_WRITE);
2012 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2013 return nfs4_share_conflict(current_fh,
2014 NFS4_SHARE_DENY_READ);
2015}
2016
2017/*
2018 * Allow READ/WRITE during grace period on recovered state only for files
2019 * that are not able to provide mandatory locking.
2020 */
2021static inline int
2022io_during_grace_disallowed(struct inode *inode, int flags)
2023{
203a8c8e 2024 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2025}
2026
0836f587
BF		 2027static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2028{
2029 /* If the client sends us a stateid from the future, it's buggy: */
2030 if (in->si_generation > ref->si_generation)
2031 return nfserr_bad_stateid;
2032 /*
2033 * The following, however, can happen. For example, if the
2034 * client sends an open and some IO at the same time, the open
2035 * may bump si_generation while the IO is still in flight.
2036 * Thanks to hard links and renames, the client never knows what
2037 * file an open will affect. So it could avoid that situation
2038 * only by serializing all opens and IO from the same open
2039 * owner. To recover from the old_stateid error, the client
2040 * will just have to retry the IO:
2041 */
2042 if (in->si_generation < ref->si_generation)
2043 return nfserr_old_stateid;
2044 return nfs_ok;
2045}
2046
3e633079
BF		 2047static int is_delegation_stateid(stateid_t *stateid)
2048{
2049 return stateid->si_fileid == 0;
2050}
2051
1da177e4
LT		 2052/*
2053* Checks for stateid operations
2054*/
b37ad28b 2055__be32
1da177e4
LT		 2056nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2057{
2058 struct nfs4_stateid *stp = NULL;
2059 struct nfs4_delegation *dp = NULL;
1da177e4 2060 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2061 __be32 status;
1da177e4 2062
1da177e4
LT		 2063 if (filpp)
2064 *filpp = NULL;
2065
2066 if (io_during_grace_disallowed(ino, flags))
2067 return nfserr_grace;
2068
2069 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2070 return check_special_stateids(current_fh, stateid, flags);
2071
1da177e4
LT		 2072 status = nfserr_stale_stateid;
2073 if (STALE_STATEID(stateid))
2074 goto out;
2075
1da177e4 2076 status = nfserr_bad_stateid;
3e633079 2077 if (is_delegation_stateid(stateid)) {
a4455be0 2078 dp = find_delegation_stateid(ino, stateid);
819a8f53 2079 if (!dp)
1da177e4 2080 goto out;
fd03b099 2081 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2082 if (status)
2083 goto out;
dc9bf700
BF		 2084 status = nfs4_check_delegmode(dp, flags);
2085 if (status)
2086 goto out;
2087 renew_client(dp->dl_client);
dc9bf700
BF		 2088 if (filpp)
2089 *filpp = dp->dl_vfs_file;
1da177e4 2090 } else { /* open or lock stateid */
a4455be0 2091 stp = find_stateid(stateid, flags);
819a8f53 2092 if (!stp)
1da177e4 2093 goto out;
6150ef0d 2094 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2095 goto out;
2096 if (!stp->st_stateowner->so_confirmed)
2097 goto out;
fd03b099 2098 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2099 if (status)
2100 goto out;
a4455be0
BF		 2101 status = nfs4_check_openmode(stp, flags);
2102 if (status)
1da177e4
LT		 2103 goto out;
2104 renew_client(stp->st_stateowner->so_client);
2105 if (filpp)
2106 *filpp = stp->st_vfs_file;
1da177e4
LT		 2107 }
2108 status = nfs_ok;
2109out:
2110 return status;
2111}
2112
4c4cd222
N		 2113static inline int
2114setlkflg (int type)
2115{
2116 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2117 RD_STATE : WR_STATE;
2118}
1da177e4
LT		 2119
2120/*
2121 * Checks for sequence id mutating operations.
2122 */
b37ad28b 2123static __be32
4c4cd222 2124nfs4_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 2125{
1da177e4
LT		 2126 struct nfs4_stateid *stp;
2127 struct nfs4_stateowner *sop;
0836f587 2128 __be32 status;
1da177e4
LT		 2129
2130 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2131 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2132 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2133 stateid->si_generation);
3a4f98bb 2134
1da177e4
LT		 2135 *stpp = NULL;
2136 *sopp = NULL;
2137
1da177e4 2138 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2139 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2140 return nfserr_bad_stateid;
1da177e4
LT		 2141 }
2142
1da177e4 2143 if (STALE_STATEID(stateid))
3a4f98bb 2144 return nfserr_stale_stateid;
1da177e4
LT		 2145 /*
2146 * We return BAD_STATEID if filehandle doesn't match stateid,
2147 * the confirmed flag is incorrecly set, or the generation
2148 * number is incorrect.
1da177e4 2149 */
f8816512
N		 2150 stp = find_stateid(stateid, flags);
2151 if (stp == NULL) {
2152 /*
2153 * Also, we should make sure this isn't just the result of
2154 * a replayed close:
2155 */
2156 sop = search_close_lru(stateid->si_stateownerid, flags);
2157 if (sop == NULL)
2158 return nfserr_bad_stateid;
2159 *sopp = sop;
2160 goto check_replay;
2161 }
1da177e4 2162
39325bd0
BF		 2163 *stpp = stp;
2164 *sopp = sop = stp->st_stateowner;
2165
4c4cd222 2166 if (lock) {
4c4cd222 2167 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2168 struct nfs4_client *clp = sop->so_client;
4c4cd222 2169 int lkflg = 0;
b37ad28b 2170 __be32 status;
4c4cd222
N		 2171
2172 lkflg = setlkflg(lock->lk_type);
2173
2174 if (lock->lk_is_new) {
599e0a22
BF		 2175 if (!sop->so_is_open_owner)
2176 return nfserr_bad_stateid;
2177 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2178 return nfserr_bad_stateid;
599e0a22
BF		 2179 /* stp is the open stateid */
2180 status = nfs4_check_openmode(stp, lkflg);
2181 if (status)
2182 return status;
2183 } else {
2184 /* stp is the lock stateid */
2185 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2186 if (status)
2187 return status;
4c4cd222 2188 }
1da177e4
LT		 2189 }
2190
f3362737 2191 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2192 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2193 return nfserr_bad_stateid;
1da177e4
LT		 2194 }
2195
1da177e4
LT		 2196 /*
2197 * We now validate the seqid and stateid generation numbers.
2198 * For the moment, we ignore the possibility of
2199 * generation number wraparound.
2200 */
bd9aac52 2201 if (seqid != sop->so_seqid)
1da177e4
LT		 2202 goto check_replay;
2203
3a4f98bb 2204 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2205 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2206 " unconfirmed stateowner!\n");
2207 return nfserr_bad_stateid;
1da177e4 2208 }
3a4f98bb 2209 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2210 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2211 " confirmed yet!\n");
2212 return nfserr_bad_stateid;
1da177e4 2213 }
0836f587
BF		 2214 status = check_stateid_generation(stateid, &stp->st_stateid);
2215 if (status)
2216 return status;
52fd004e 2217 renew_client(sop->so_client);
3a4f98bb 2218 return nfs_ok;
1da177e4 2219
1da177e4 2220check_replay:
bd9aac52 2221 if (seqid == sop->so_seqid - 1) {
849823c5 2222 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2223 /* indicate replay to calling function */
a90b061c 2224 return nfserr_replay_me;
1da177e4 2225 }
2fdada03 2226 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2227 sop->so_seqid, seqid);
2228 *sopp = NULL;
2229 return nfserr_bad_seqid;
1da177e4
LT		 2230}
2231
b37ad28b 2232__be32
ca364317 2233nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2234 struct nfsd4_open_confirm *oc)
1da177e4 2235{
b37ad28b 2236 __be32 status;
1da177e4
LT		 2237 struct nfs4_stateowner *sop;
2238 struct nfs4_stateid *stp;
2239
2240 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2241 (int)cstate->current_fh.fh_dentry->d_name.len,
2242 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2243
ca364317 2244 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2245 if (status)
2246 return status;
1da177e4
LT		 2247
2248 nfs4_lock_state();
2249
ca364317
BF		 2250 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2251 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2252 CONFIRM | OPEN_STATE,
1da177e4
LT		 2253 &oc->oc_stateowner, &stp, NULL)))
2254 goto out;
2255
2256 sop = oc->oc_stateowner;
2257 sop->so_confirmed = 1;
2258 update_stateid(&stp->st_stateid);
2259 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2260 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2261 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2262 stp->st_stateid.si_boot,
2263 stp->st_stateid.si_stateownerid,
2264 stp->st_stateid.si_fileid,
2265 stp->st_stateid.si_generation);
c7b9a459
N		 2266
2267 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2268out:
f2327d9a 2269 if (oc->oc_stateowner) {
1da177e4 2270 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2271 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2272 }
1da177e4
LT		 2273 nfs4_unlock_state();
2274 return status;
2275}
2276
2277
2278/*
2279 * unset all bits in union bitmap (bmap) that
2280 * do not exist in share (from successful OPEN_DOWNGRADE)
2281 */
2282static void
2283reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2284{
2285 int i;
2286 for (i = 1; i < 4; i++) {
2287 if ((i & access) != i)
2288 __clear_bit(i, bmap);
2289 }
2290}
2291
2292static void
2293reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2294{
2295 int i;
2296 for (i = 0; i < 4; i++) {
2297 if ((i & deny) != i)
2298 __clear_bit(i, bmap);
2299 }
2300}
2301
b37ad28b 2302__be32
ca364317
BF		 2303nfsd4_open_downgrade(struct svc_rqst *rqstp,
2304 struct nfsd4_compound_state *cstate,
a4f1706a 2305 struct nfsd4_open_downgrade *od)
1da177e4 2306{
b37ad28b 2307 __be32 status;
1da177e4
LT		 2308 struct nfs4_stateid *stp;
2309 unsigned int share_access;
2310
2311 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2312 (int)cstate->current_fh.fh_dentry->d_name.len,
2313 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2314
ba5a6a19
BF		 2315 if (!access_valid(od->od_share_access)
2316 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2317 return nfserr_inval;
2318
2319 nfs4_lock_state();
ca364317
BF		 2320 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2321 od->od_seqid,
1da177e4 2322 &od->od_stateid,
f3362737 2323 OPEN_STATE,
1da177e4
LT		 2324 &od->od_stateowner, &stp, NULL)))
2325 goto out;
2326
2327 status = nfserr_inval;
2328 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2329 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2330 stp->st_access_bmap, od->od_share_access);
2331 goto out;
2332 }
2333 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2334 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2335 stp->st_deny_bmap, od->od_share_deny);
2336 goto out;
2337 }
2338 set_access(&share_access, stp->st_access_bmap);
2339 nfs4_file_downgrade(stp->st_vfs_file,
2340 share_access & ~od->od_share_access);
2341
2342 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2343 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2344
2345 update_stateid(&stp->st_stateid);
2346 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2347 status = nfs_ok;
2348out:
f2327d9a 2349 if (od->od_stateowner) {
1da177e4 2350 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2351 cstate->replay_owner = od->od_stateowner;
f2327d9a 2352 }
1da177e4
LT		 2353 nfs4_unlock_state();
2354 return status;
2355}
2356
2357/*
2358 * nfs4_unlock_state() called after encode
2359 */
b37ad28b 2360__be32
ca364317 2361nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2362 struct nfsd4_close *close)
1da177e4 2363{
b37ad28b 2364 __be32 status;
1da177e4
LT		 2365 struct nfs4_stateid *stp;
2366
2367 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2368 (int)cstate->current_fh.fh_dentry->d_name.len,
2369 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2370
2371 nfs4_lock_state();
2372 /* check close_lru for replay */
ca364317
BF		 2373 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2374 close->cl_seqid,
1da177e4 2375 &close->cl_stateid,
f3362737 2376 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2377 &close->cl_stateowner, &stp, NULL)))
2378 goto out;
1da177e4
LT		 2379 status = nfs_ok;
2380 update_stateid(&stp->st_stateid);
2381 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2382
04ef5954 2383 /* release_stateid() calls nfsd_close() if needed */
2283963f 2384 release_open_stateid(stp);
04ef5954
BF		 2385
2386 /* place unused nfs4_stateowners on so_close_lru list to be
2387 * released by the laundromat service after the lease period
2388 * to enable us to handle CLOSE replay
2389 */
2390 if (list_empty(&close->cl_stateowner->so_stateids))
2391 move_to_close_lru(close->cl_stateowner);
1da177e4 2392out:
f2327d9a 2393 if (close->cl_stateowner) {
1da177e4 2394 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2395 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2396 }
1da177e4
LT		 2397 nfs4_unlock_state();
2398 return status;
2399}
2400
b37ad28b 2401__be32
ca364317
BF		 2402nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2403 struct nfsd4_delegreturn *dr)
1da177e4 2404{
203a8c8e
BF		 2405 struct nfs4_delegation *dp;
2406 stateid_t *stateid = &dr->dr_stateid;
2407 struct inode *inode;
b37ad28b 2408 __be32 status;
1da177e4 2409
ca364317 2410 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2411 return status;
2412 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2413
2414 nfs4_lock_state();
203a8c8e
BF		 2415 status = nfserr_bad_stateid;
2416 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2417 goto out;
2418 status = nfserr_stale_stateid;
2419 if (STALE_STATEID(stateid))
2420 goto out;
7e0f7cf5 2421 status = nfserr_bad_stateid;
203a8c8e
BF		 2422 if (!is_delegation_stateid(stateid))
2423 goto out;
203a8c8e
BF		 2424 dp = find_delegation_stateid(inode, stateid);
2425 if (!dp)
2426 goto out;
2427 status = check_stateid_generation(stateid, &dp->dl_stateid);
2428 if (status)
2429 goto out;
2430 renew_client(dp->dl_client);
2431
2432 unhash_delegation(dp);
1da177e4 2433out:
203a8c8e
BF		 2434 nfs4_unlock_state();
2435
1da177e4
LT		 2436 return status;
2437}
2438
2439
2440/*
2441 * Lock owner state (byte-range locks)
2442 */
2443#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2444#define LOCK_HASH_BITS 8
2445#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2446#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2447
87df4de8
BH		 2448static inline u64
2449end_offset(u64 start, u64 len)
2450{
2451 u64 end;
2452
2453 end = start + len;
2454 return end >= start ? end: NFS4_MAX_UINT64;
2455}
2456
2457/* last octet in a range */
2458static inline u64
2459last_byte_offset(u64 start, u64 len)
2460{
2461 u64 end;
2462
2463 BUG_ON(!len);
2464 end = start + len;
2465 return end > start ? end - 1: NFS4_MAX_UINT64;
2466}
2467
1da177e4
LT		 2468#define lockownerid_hashval(id) \
2469 ((id) & LOCK_HASH_MASK)
2470
2471static inline unsigned int
2472lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2473 struct xdr_netobj *ownername)
2474{
2475 return (file_hashval(inode) + cl_id
2476 + opaque_hashval(ownername->data, ownername->len))
2477 & LOCK_HASH_MASK;
2478}
2479
2480static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2481static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2482static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2483
fd39ca9a 2484static struct nfs4_stateid *
1da177e4
LT		 2485find_stateid(stateid_t *stid, int flags)
2486{
9346eff0 2487 struct nfs4_stateid *local;
1da177e4
LT		 2488 u32 st_id = stid->si_stateownerid;
2489 u32 f_id = stid->si_fileid;
2490 unsigned int hashval;
2491
2492 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2493 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2494 hashval = stateid_hashval(st_id, f_id);
2495 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2496 if ((local->st_stateid.si_stateownerid == st_id) &&
2497 (local->st_stateid.si_fileid == f_id))
2498 return local;
2499 }
2500 }
9346eff0
KK		 2501
2502 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2503 hashval = stateid_hashval(st_id, f_id);
2504 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2505 if ((local->st_stateid.si_stateownerid == st_id) &&
2506 (local->st_stateid.si_fileid == f_id))
2507 return local;
2508 }
849823c5 2509 }
1da177e4
LT		 2510 return NULL;
2511}
2512
2513static struct nfs4_delegation *
2514find_delegation_stateid(struct inode *ino, stateid_t *stid)
2515{
13cd2184
N		 2516 struct nfs4_file *fp;
2517 struct nfs4_delegation *dl;
1da177e4
LT		 2518
2519 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2520 stid->si_boot, stid->si_stateownerid,
2521 stid->si_fileid, stid->si_generation);
2522
1da177e4 2523 fp = find_file(ino);
13cd2184
N		 2524 if (!fp)
2525 return NULL;
2526 dl = find_delegation_file(fp, stid);
2527 put_nfs4_file(fp);
2528 return dl;
1da177e4
LT		 2529}
2530
2531/*
2532 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2533 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2534 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2535 * locking, this prevents us from being completely protocol-compliant. The
2536 * real solution to this problem is to start using unsigned file offsets in
2537 * the VFS, but this is a very deep change!
2538 */
2539static inline void
2540nfs4_transform_lock_offset(struct file_lock *lock)
2541{
2542 if (lock->fl_start < 0)
2543 lock->fl_start = OFFSET_MAX;
2544 if (lock->fl_end < 0)
2545 lock->fl_end = OFFSET_MAX;
2546}
2547
d5b9026a
N		 2548/* Hack!: For now, we're defining this just so we can use a pointer to it
2549 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2550static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2551};
1da177e4
LT		 2552
2553static inline void
2554nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2555{
d5b9026a
N		 2556 struct nfs4_stateowner *sop;
2557 unsigned int hval;
1da177e4 2558
d5b9026a
N		 2559 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2560 sop = (struct nfs4_stateowner *) fl->fl_owner;
2561 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2562 kref_get(&sop->so_ref);
2563 deny->ld_sop = sop;
2564 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2565 } else {
2566 deny->ld_sop = NULL;
2567 deny->ld_clientid.cl_boot = 0;
2568 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2569 }
2570 deny->ld_start = fl->fl_start;
87df4de8
BH		 2571 deny->ld_length = NFS4_MAX_UINT64;
2572 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2573 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2574 deny->ld_type = NFS4_READ_LT;
2575 if (fl->fl_type != F_RDLCK)
2576 deny->ld_type = NFS4_WRITE_LT;
2577}
2578
1da177e4
LT		 2579static struct nfs4_stateowner *
2580find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2581 struct xdr_netobj *owner)
2582{
2583 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2584 struct nfs4_stateowner *op;
2585
2586 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2587 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2588 return op;
2589 }
2590 return NULL;
2591}
2592
2593/*
2594 * Alloc a lock owner structure.
2595 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2596 * occured.
2597 *
2598 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2599 */
2600
2601static struct nfs4_stateowner *
2602alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2603 struct nfs4_stateowner *sop;
2604 struct nfs4_replay *rp;
2605 unsigned int idhashval;
2606
2607 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2608 return NULL;
2609 idhashval = lockownerid_hashval(current_ownerid);
2610 INIT_LIST_HEAD(&sop->so_idhash);
2611 INIT_LIST_HEAD(&sop->so_strhash);
2612 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2613 INIT_LIST_HEAD(&sop->so_stateids);
2614 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2615 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2616 sop->so_time = 0;
2617 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2618 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2619 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2620 sop->so_is_open_owner = 0;
2621 sop->so_id = current_ownerid++;
2622 sop->so_client = clp;
b59e3c0e
NB		 2623 /* It is the openowner seqid that will be incremented in encode in the
2624 * case of new lockowners; so increment the lock seqid manually: */
2625 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2626 sop->so_confirmed = 1;
2627 rp = &sop->so_replay;
de1ae286 2628 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2629 rp->rp_buflen = 0;
2630 rp->rp_buf = rp->rp_ibuf;
2631 return sop;
2632}
2633
fd39ca9a 2634static struct nfs4_stateid *
1da177e4
LT		 2635alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2636{
2637 struct nfs4_stateid *stp;
2638 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2639
5ac049ac
N		 2640 stp = nfs4_alloc_stateid();
2641 if (stp == NULL)
1da177e4
LT		 2642 goto out;
2643 INIT_LIST_HEAD(&stp->st_hash);
2644 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2645 INIT_LIST_HEAD(&stp->st_perstateowner);
2646 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2647 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2648 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2649 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2650 stp->st_stateowner = sop;
13cd2184 2651 get_nfs4_file(fp);
1da177e4
LT		 2652 stp->st_file = fp;
2653 stp->st_stateid.si_boot = boot_time;
2654 stp->st_stateid.si_stateownerid = sop->so_id;
2655 stp->st_stateid.si_fileid = fp->fi_id;
2656 stp->st_stateid.si_generation = 0;
2657 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2658 stp->st_access_bmap = open_stp->st_access_bmap;
2659 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2660 stp->st_openstp = open_stp;
1da177e4
LT		 2661
2662out:
2663 return stp;
2664}
2665
fd39ca9a 2666static int
1da177e4
LT		 2667check_lock_length(u64 offset, u64 length)
2668{
87df4de8 2669 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2670 LOFF_OVERFLOW(offset, length)));
2671}
2672
2673/*
2674 * LOCK operation
2675 */
b37ad28b 2676__be32
ca364317 2677nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2678 struct nfsd4_lock *lock)
1da177e4 2679{
3e9e3dbe 2680 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2681 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2682 struct nfs4_stateid *lock_stp;
2683 struct file *filp;
2684 struct file_lock file_lock;
8dc7c311 2685 struct file_lock conflock;
b37ad28b 2686 __be32 status = 0;
1da177e4 2687 unsigned int strhashval;
150b3934 2688 unsigned int cmd;
b8dd7b9a 2689 int err;
1da177e4
LT		 2690
2691 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2692 (long long) lock->lk_offset,
2693 (long long) lock->lk_length);
2694
1da177e4
LT		 2695 if (check_lock_length(lock->lk_offset, lock->lk_length))
2696 return nfserr_inval;
2697
ca364317 2698 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2699 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2700 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2701 return status;
2702 }
2703
1da177e4
LT		 2704 nfs4_lock_state();
2705
2706 if (lock->lk_is_new) {
893f8770
N		 2707 /*
2708 * Client indicates that this is a new lockowner.
2709 * Use open owner and open stateid to create lock owner and
2710 * lock stateid.
2711 */
1da177e4
LT		 2712 struct nfs4_stateid *open_stp = NULL;
2713 struct nfs4_file *fp;
2714
2715 status = nfserr_stale_clientid;
849823c5 2716 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2717 goto out;
1da177e4 2718
1da177e4 2719 /* validate and update open stateid and open seqid */
ca364317 2720 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2721 lock->lk_new_open_seqid,
2722 &lock->lk_new_open_stateid,
f3362737 2723 OPEN_STATE,
3a65588a 2724 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2725 lock);
37515177 2726 if (status)
1da177e4 2727 goto out;
3a65588a 2728 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2729 /* create lockowner and lock stateid */
2730 fp = open_stp->st_file;
2731 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2732 open_sop->so_client->cl_clientid.cl_id,
2733 &lock->v.new.owner);
3e9e3dbe
N		 2734 /* XXX: Do we need to check for duplicate stateowners on
2735 * the same file, or should they just be allowed (and
2736 * create new stateids)? */
1da177e4 2737 status = nfserr_resource;
b59e3c0e
NB		 2738 lock_sop = alloc_init_lock_stateowner(strhashval,
2739 open_sop->so_client, open_stp, lock);
2740 if (lock_sop == NULL)
1da177e4 2741 goto out;
b59e3c0e 2742 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2743 if (lock_stp == NULL)
1da177e4 2744 goto out;
1da177e4
LT		 2745 } else {
2746 /* lock (lock owner + lock stateid) already exists */
ca364317 2747 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2748 lock->lk_old_lock_seqid,
2749 &lock->lk_old_lock_stateid,
f3362737 2750 LOCK_STATE,
3a65588a 2751 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2752 if (status)
2753 goto out;
3a65588a 2754 lock_sop = lock->lk_replay_owner;
1da177e4 2755 }
3a65588a 2756 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2757 filp = lock_stp->st_vfs_file;
2758
0dd395dc 2759 status = nfserr_grace;
af558e33 2760 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 2761 goto out;
2762 status = nfserr_no_grace;
af558e33 2763 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 2764 goto out;
2765
1da177e4
LT		 2766 locks_init_lock(&file_lock);
2767 switch (lock->lk_type) {
2768 case NFS4_READ_LT:
2769 case NFS4_READW_LT:
2770 file_lock.fl_type = F_RDLCK;
150b3934 2771 cmd = F_SETLK;
1da177e4
LT		 2772 break;
2773 case NFS4_WRITE_LT:
2774 case NFS4_WRITEW_LT:
2775 file_lock.fl_type = F_WRLCK;
150b3934 2776 cmd = F_SETLK;
1da177e4
LT		 2777 break;
2778 default:
2779 status = nfserr_inval;
2780 goto out;
2781 }
b59e3c0e 2782 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2783 file_lock.fl_pid = current->tgid;
2784 file_lock.fl_file = filp;
2785 file_lock.fl_flags = FL_POSIX;
d5b9026a 2786 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2787
2788 file_lock.fl_start = lock->lk_offset;
87df4de8 2789 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 2790 nfs4_transform_lock_offset(&file_lock);
2791
2792 /*
2793 * Try to lock the file in the VFS.
2794 * Note: locks.c uses the BKL to protect the inode's lock list.
2795 */
2796
fd85b817 2797 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2798 switch (-err) {
1da177e4
LT		 2799 case 0: /* success! */
2800 update_stateid(&lock_stp->st_stateid);
2801 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2802 sizeof(stateid_t));
b8dd7b9a 2803 status = 0;
eb76b3fd
AA		 2804 break;
2805 case (EAGAIN): /* conflock holds conflicting lock */
2806 status = nfserr_denied;
2807 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2808 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2809 break;
1da177e4
LT		 2810 case (EDEADLK):
2811 status = nfserr_deadlock;
eb76b3fd 2812 break;
1da177e4 2813 default:
fd85b817 2814 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2815 status = nfserr_resource;
2816 break;
1da177e4 2817 }
1da177e4 2818out:
8a280510 2819 if (status && lock->lk_is_new && lock_sop)
f044ff83 2820 release_lockowner(lock_sop);
3a65588a
BF		 2821 if (lock->lk_replay_owner) {
2822 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2823 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2824 }
1da177e4
LT		 2825 nfs4_unlock_state();
2826 return status;
2827}
2828
55ef1274
BF		 2829/*
2830 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2831 * so we do a temporary open here just to get an open file to pass to
2832 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2833 * inode operation.)
2834 */
2835static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2836{
2837 struct file *file;
2838 int err;
2839
2840 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2841 if (err)
2842 return err;
2843 err = vfs_test_lock(file, lock);
2844 nfsd_close(file);
2845 return err;
2846}
2847
1da177e4
LT		 2848/*
2849 * LOCKT operation
2850 */
b37ad28b 2851__be32
ca364317
BF		 2852nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2853 struct nfsd4_lockt *lockt)
1da177e4
LT		 2854{
2855 struct inode *inode;
1da177e4 2856 struct file_lock file_lock;
fd85b817 2857 int error;
b37ad28b 2858 __be32 status;
1da177e4 2859
af558e33 2860 if (locks_in_grace())
1da177e4
LT		 2861 return nfserr_grace;
2862
2863 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2864 return nfserr_inval;
2865
2866 lockt->lt_stateowner = NULL;
2867 nfs4_lock_state();
2868
2869 status = nfserr_stale_clientid;
849823c5 2870 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2871 goto out;
1da177e4 2872
ca364317 2873 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2874 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2875 if (status == nfserr_symlink)
2876 status = nfserr_inval;
2877 goto out;
2878 }
2879
ca364317 2880 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2881 locks_init_lock(&file_lock);
2882 switch (lockt->lt_type) {
2883 case NFS4_READ_LT:
2884 case NFS4_READW_LT:
2885 file_lock.fl_type = F_RDLCK;
2886 break;
2887 case NFS4_WRITE_LT:
2888 case NFS4_WRITEW_LT:
2889 file_lock.fl_type = F_WRLCK;
2890 break;
2891 default:
2fdada03 2892 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2893 status = nfserr_inval;
2894 goto out;
2895 }
2896
2897 lockt->lt_stateowner = find_lockstateowner_str(inode,
2898 &lockt->lt_clientid, &lockt->lt_owner);
2899 if (lockt->lt_stateowner)
2900 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2901 file_lock.fl_pid = current->tgid;
2902 file_lock.fl_flags = FL_POSIX;
2903
2904 file_lock.fl_start = lockt->lt_offset;
87df4de8 2905 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 2906
2907 nfs4_transform_lock_offset(&file_lock);
2908
1da177e4 2909 status = nfs_ok;
55ef1274 2910 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 2911 if (error) {
2912 status = nfserrno(error);
2913 goto out;
2914 }
9d6a8c5c 2915 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2916 status = nfserr_denied;
9d6a8c5c 2917 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2918 }
2919out:
2920 nfs4_unlock_state();
2921 return status;
2922}
2923
b37ad28b 2924__be32
ca364317 2925nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2926 struct nfsd4_locku *locku)
1da177e4
LT		 2927{
2928 struct nfs4_stateid *stp;
2929 struct file *filp = NULL;
2930 struct file_lock file_lock;
b37ad28b 2931 __be32 status;
b8dd7b9a 2932 int err;
1da177e4
LT		 2933
2934 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2935 (long long) locku->lu_offset,
2936 (long long) locku->lu_length);
2937
2938 if (check_lock_length(locku->lu_offset, locku->lu_length))
2939 return nfserr_inval;
2940
2941 nfs4_lock_state();
2942
ca364317 2943 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2944 locku->lu_seqid,
2945 &locku->lu_stateid,
f3362737 2946 LOCK_STATE,
1da177e4
LT		 2947 &locku->lu_stateowner, &stp, NULL)))
2948 goto out;
2949
2950 filp = stp->st_vfs_file;
2951 BUG_ON(!filp);
2952 locks_init_lock(&file_lock);
2953 file_lock.fl_type = F_UNLCK;
2954 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2955 file_lock.fl_pid = current->tgid;
2956 file_lock.fl_file = filp;
2957 file_lock.fl_flags = FL_POSIX;
d5b9026a 2958 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2959 file_lock.fl_start = locku->lu_offset;
2960
87df4de8 2961 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 2962 nfs4_transform_lock_offset(&file_lock);
2963
2964 /*
2965 * Try to unlock the file in the VFS.
2966 */
fd85b817 2967 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2968 if (err) {
fd85b817 2969 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2970 goto out_nfserr;
2971 }
2972 /*
2973 * OK, unlock succeeded; the only thing left to do is update the stateid.
2974 */
2975 update_stateid(&stp->st_stateid);
2976 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2977
2978out:
f2327d9a 2979 if (locku->lu_stateowner) {
1da177e4 2980 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2981 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2982 }
1da177e4
LT		 2983 nfs4_unlock_state();
2984 return status;
2985
2986out_nfserr:
b8dd7b9a 2987 status = nfserrno(err);
1da177e4
LT		 2988 goto out;
2989}
2990
2991/*
2992 * returns
2993 * 1: locks held by lockowner
2994 * 0: no locks held by lockowner
2995 */
2996static int
2997check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2998{
2999 struct file_lock **flpp;
7eaa36e2 3000 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3001 int status = 0;
3002
3003 lock_kernel();
3004 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3005 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3006 status = 1;
3007 goto out;
796dadfd 3008 }
1da177e4
LT		 3009 }
3010out:
3011 unlock_kernel();
3012 return status;
3013}
3014
b37ad28b 3015__be32
b591480b
BF		 3016nfsd4_release_lockowner(struct svc_rqst *rqstp,
3017 struct nfsd4_compound_state *cstate,
3018 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3019{
3020 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3021 struct nfs4_stateowner *sop;
3022 struct nfs4_stateid *stp;
1da177e4 3023 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3024 struct list_head matches;
3025 int i;
b37ad28b 3026 __be32 status;
1da177e4
LT		 3027
3028 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3029 clid->cl_boot, clid->cl_id);
3030
3031 /* XXX check for lease expiration */
3032
3033 status = nfserr_stale_clientid;
849823c5 3034 if (STALE_CLIENTID(clid))
1da177e4 3035 return status;
1da177e4
LT		 3036
3037 nfs4_lock_state();
3038
3e9e3dbe
N		 3039 status = nfserr_locks_held;
3040 /* XXX: we're doing a linear search through all the lockowners.
3041 * Yipes! For now we'll just hope clients aren't really using
3042 * release_lockowner much, but eventually we have to fix these
3043 * data structures. */
3044 INIT_LIST_HEAD(&matches);
3045 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3046 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3047 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3048 continue;
3049 list_for_each_entry(stp, &sop->so_stateids,
3050 st_perstateowner) {
3051 if (check_for_locks(stp->st_vfs_file, sop))
3052 goto out;
3053 /* Note: so_perclient unused for lockowners,
3054 * so it's OK to fool with here. */
3055 list_add(&sop->so_perclient, &matches);
3056 }
1da177e4 3057 }
3e9e3dbe
N		 3058 }
3059 /* Clients probably won't expect us to return with some (but not all)
3060 * of the lockowner state released; so don't release any until all
3061 * have been checked. */
3062 status = nfs_ok;
0fa822e4
N		 3063 while (!list_empty(&matches)) {
3064 sop = list_entry(matches.next, struct nfs4_stateowner,
3065 so_perclient);
3066 /* unhash_stateowner deletes so_perclient only
3067 * for openowners. */
3068 list_del(&sop->so_perclient);
f044ff83 3069 release_lockowner(sop);
1da177e4
LT		 3070 }
3071out:
3072 nfs4_unlock_state();
3073 return status;
3074}
3075
3076static inline struct nfs4_client_reclaim *
a55370a3 3077alloc_reclaim(void)
1da177e4 3078{
a55370a3 3079 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3080}
3081
c7b9a459
N		 3082int
3083nfs4_has_reclaimed_state(const char *name)
3084{
3085 unsigned int strhashval = clientstr_hashval(name);
3086 struct nfs4_client *clp;
3087
3088 clp = find_confirmed_client_by_str(name, strhashval);
3089 return clp ? 1 : 0;
3090}
3091
1da177e4
LT		 3092/*
3093 * failure => all reset bets are off, nfserr_no_grace...
3094 */
190e4fbf
N		 3095int
3096nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3097{
3098 unsigned int strhashval;
3099 struct nfs4_client_reclaim *crp = NULL;
3100
a55370a3
N		 3101 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3102 crp = alloc_reclaim();
1da177e4
LT		 3103 if (!crp)
3104 return 0;
a55370a3 3105 strhashval = clientstr_hashval(name);
1da177e4
LT		 3106 INIT_LIST_HEAD(&crp->cr_strhash);
3107 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3108 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3109 reclaim_str_hashtbl_size++;
3110 return 1;
3111}
3112
3113static void
3114nfs4_release_reclaim(void)
3115{
3116 struct nfs4_client_reclaim *crp = NULL;
3117 int i;
3118
1da177e4
LT		 3119 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3120 while (!list_empty(&reclaim_str_hashtbl[i])) {
3121 crp = list_entry(reclaim_str_hashtbl[i].next,
3122 struct nfs4_client_reclaim, cr_strhash);
3123 list_del(&crp->cr_strhash);
1da177e4
LT		 3124 kfree(crp);
3125 reclaim_str_hashtbl_size--;
3126 }
3127 }
3128 BUG_ON(reclaim_str_hashtbl_size);
3129}
3130
3131/*
3132 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3133static struct nfs4_client_reclaim *
1da177e4
LT		 3134nfs4_find_reclaim_client(clientid_t *clid)
3135{
3136 unsigned int strhashval;
3137 struct nfs4_client *clp;
3138 struct nfs4_client_reclaim *crp = NULL;
3139
3140
3141 /* find clientid in conf_id_hashtbl */
3142 clp = find_confirmed_client(clid);
3143 if (clp == NULL)
3144 return NULL;
3145
a55370a3
N		 3146 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3147 clp->cl_name.len, clp->cl_name.data,
3148 clp->cl_recdir);
1da177e4
LT		 3149
3150 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3151 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3152 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3153 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3154 return crp;
3155 }
3156 }
3157 return NULL;
3158}
3159
3160/*
3161* Called from OPEN. Look for clientid in reclaim list.
3162*/
b37ad28b 3163__be32
1da177e4
LT		 3164nfs4_check_open_reclaim(clientid_t *clid)
3165{
dfc83565 3166 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3167}
3168
ac4d8ff2 3169/* initialization to perform at module load time: */
1da177e4 3170
e8ff2a84 3171int
ac4d8ff2 3172nfs4_state_init(void)
1da177e4 3173{
e8ff2a84 3174 int i, status;
1da177e4 3175
e8ff2a84
BF		 3176 status = nfsd4_init_slabs();
3177 if (status)
3178 return status;
1da177e4
LT		 3179 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3180 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3181 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3182 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3183 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3184 }
3185 for (i = 0; i < FILE_HASH_SIZE; i++) {
3186 INIT_LIST_HEAD(&file_hashtbl[i]);
3187 }
3188 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3189 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3190 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3191 }
3192 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3193 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3194 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3195 }
3196 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3197 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3198 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3199 }
1da177e4 3200 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3201 INIT_LIST_HEAD(&close_lru);
3202 INIT_LIST_HEAD(&client_lru);
3203 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3204 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3205 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3206 reclaim_str_hashtbl_size = 0;
e8ff2a84 3207 return 0;
ac4d8ff2
N		 3208}
3209
190e4fbf
N		 3210static void
3211nfsd4_load_reboot_recovery_data(void)
3212{
3213 int status;
3214
0964a3d3
N		 3215 nfs4_lock_state();
3216 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3217 status = nfsd4_recdir_load();
0964a3d3 3218 nfs4_unlock_state();
190e4fbf
N		 3219 if (status)
3220 printk("NFSD: Failure reading reboot recovery data\n");
3221}
3222
9a8db97e
ME		 3223unsigned long
3224get_nfs4_grace_period(void)
3225{
3226 return max(user_lease_time, lease_time) * HZ;
3227}
3228
c2f1a551
MS		 3229/*
3230 * Since the lifetime of a delegation isn't limited to that of an open, a
3231 * client may quite reasonably hang on to a delegation as long as it has
3232 * the inode cached. This becomes an obvious problem the first time a
3233 * client's inode cache approaches the size of the server's total memory.
3234 *
3235 * For now we avoid this problem by imposing a hard limit on the number
3236 * of delegations, which varies according to the server's memory size.
3237 */
3238static void
3239set_max_delegations(void)
3240{
3241 /*
3242 * Allow at most 4 delegations per megabyte of RAM. Quick
3243 * estimates suggest that in the worst case (where every delegation
3244 * is for a different inode), a delegation could take about 1.5K,
3245 * giving a worst case usage of about 6% of memory.
3246 */
3247 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3248}
3249
ac4d8ff2
N		 3250/* initialization to perform when the nfsd service is started: */
3251
3252static void
3253__nfs4_state_start(void)
3254{
9a8db97e 3255 unsigned long grace_time;
ac4d8ff2 3256
1da177e4 3257 boot_time = get_seconds();
af558e33 3258 grace_time = get_nfs4_grace_period();
d99a05ad 3259 lease_time = user_lease_time;
af558e33 3260 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3261 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3262 grace_time/HZ);
58da282b 3263 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3264 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3265 set_max_delegations();
1da177e4
LT		 3266}
3267
e8ff2a84 3268void
76a3550e 3269nfs4_state_start(void)
1da177e4 3270{
1da177e4 3271 if (nfs4_init)
e8ff2a84 3272 return;
190e4fbf 3273 nfsd4_load_reboot_recovery_data();
76a3550e 3274 __nfs4_state_start();
1da177e4 3275 nfs4_init = 1;
e8ff2a84 3276 return;
1da177e4
LT		 3277}
3278
1da177e4
LT		 3279time_t
3280nfs4_lease_time(void)
3281{
3282 return lease_time;
3283}
3284
3285static void
3286__nfs4_state_shutdown(void)
3287{
3288 int i;
3289 struct nfs4_client *clp = NULL;
3290 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3291 struct list_head *pos, *next, reaplist;
3292
1da177e4
LT		 3293 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3294 while (!list_empty(&conf_id_hashtbl[i])) {
3295 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3296 expire_client(clp);
3297 }
3298 while (!list_empty(&unconf_str_hashtbl[i])) {
3299 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3300 expire_client(clp);
3301 }
3302 }
3303 INIT_LIST_HEAD(&reaplist);
3304 spin_lock(&recall_lock);
3305 list_for_each_safe(pos, next, &del_recall_lru) {
3306 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3307 list_move(&dp->dl_recall_lru, &reaplist);
3308 }
3309 spin_unlock(&recall_lock);
3310 list_for_each_safe(pos, next, &reaplist) {
3311 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3312 list_del_init(&dp->dl_recall_lru);
3313 unhash_delegation(dp);
3314 }
3315
190e4fbf 3316 nfsd4_shutdown_recdir();
1da177e4 3317 nfs4_init = 0;
1da177e4
LT		 3318}
3319
3320void
3321nfs4_state_shutdown(void)
3322{
5e8d5c29
N		 3323 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3324 destroy_workqueue(laundry_wq);
2c5e7615 3325 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3326 nfs4_lock_state();
3327 nfs4_release_reclaim();
3328 __nfs4_state_shutdown();
1da177e4
LT		 3329 nfs4_unlock_state();
3330}
3331
3dd98a3b
JL		 3332/*
3333 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3334 * accessed when nfsd is starting.
3335 */
0964a3d3
N		 3336static void
3337nfs4_set_recdir(char *recdir)
3338{
0964a3d3 3339 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3340}
3341
3342/*
3343 * Change the NFSv4 recovery directory to recdir.
3344 */
3345int
3346nfs4_reset_recoverydir(char *recdir)
3347{
3348 int status;
a63bb996 3349 struct path path;
0964a3d3 3350
a63bb996 3351 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3352 if (status)
3353 return status;
3354 status = -ENOTDIR;
a63bb996 3355 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3356 nfs4_set_recdir(recdir);
3357 status = 0;
3358 }
a63bb996 3359 path_put(&path);
0964a3d3
N		 3360 return status;
3361}
3362
3dd98a3b
JL		 3363char *
3364nfs4_recoverydir(void)
3365{
3366 return user_recovery_dirname;
3367}
3368
1da177e4
LT		 3369/*
3370 * Called when leasetime is changed.
3371 *
d99a05ad
N		 3372 * The only way the protocol gives us to handle on-the-fly lease changes is to
3373 * simulate a reboot. Instead of doing that, we just wait till the next time
3374 * we start to register any changes in lease time. If the administrator
3375 * really wants to change the lease time *now*, they can go ahead and bring
3376 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3377 *
3378 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3379 * when nfsd is starting
1da177e4
LT		 3380 */
3381void
3382nfs4_reset_lease(time_t leasetime)
3383{
d99a05ad 3384 user_lease_time = leasetime;
1da177e4 3385}
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