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nfsd4: use helper for copying filehandles for replay
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4
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;
218 dp->dl_fhlen = current_fh->fh_handle.fh_size;
219 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
220 current_fh->fh_handle.fh_size);
221 dp->dl_time = 0;
222 atomic_set(&dp->dl_count, 1);
ea1da636
N		 223 list_add(&dp->dl_perfile, &fp->fi_delegations);
224 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 225 return dp;
226}
227
228void
229nfs4_put_delegation(struct nfs4_delegation *dp)
230{
231 if (atomic_dec_and_test(&dp->dl_count)) {
232 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 233 put_nfs4_file(dp->dl_file);
5b2d21c1 234 kmem_cache_free(deleg_slab, dp);
ef0f3390 235 num_delegations--;
1da177e4
LT		 236 }
237}
238
239/* Remove the associated file_lock first, then remove the delegation.
240 * lease_modify() is called to remove the FS_LEASE file_lock from
241 * the i_flock list, eventually calling nfsd's lock_manager
242 * fl_release_callback.
243 */
244static void
245nfs4_close_delegation(struct nfs4_delegation *dp)
246{
247 struct file *filp = dp->dl_vfs_file;
248
249 dprintk("NFSD: close_delegation dp %p\n",dp);
250 dp->dl_vfs_file = NULL;
251 /* The following nfsd_close may not actually close the file,
252 * but we want to remove the lease in any case. */
c907132d 253 if (dp->dl_flock)
a9933cea 254 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 255 nfsd_close(filp);
1da177e4
LT		 256}
257
258/* Called under the state lock. */
259static void
260unhash_delegation(struct nfs4_delegation *dp)
261{
ea1da636
N		 262 list_del_init(&dp->dl_perfile);
263 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 264 spin_lock(&recall_lock);
265 list_del_init(&dp->dl_recall_lru);
266 spin_unlock(&recall_lock);
267 nfs4_close_delegation(dp);
268 nfs4_put_delegation(dp);
269}
270
271/*
272 * SETCLIENTID state
273 */
274
275/* Hash tables for nfs4_clientid state */
276#define CLIENT_HASH_BITS 4
277#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
278#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
279
280#define clientid_hashval(id) \
281 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 282#define clientstr_hashval(name) \
283 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 284/*
285 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
286 * used in reboot/reset lease grace period processing
287 *
288 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
289 * setclientid_confirmed info.
290 *
291 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
292 * setclientid info.
293 *
294 * client_lru holds client queue ordered by nfs4_client.cl_time
295 * for lease renewal.
296 *
297 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
298 * for last close replay.
299 */
300static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
301static int reclaim_str_hashtbl_size = 0;
302static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
303static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
304static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
305static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
306static struct list_head client_lru;
307static struct list_head close_lru;
308
2283963f
BF		 309static void unhash_generic_stateid(struct nfs4_stateid *stp)
310{
311 list_del(&stp->st_hash);
312 list_del(&stp->st_perfile);
313 list_del(&stp->st_perstateowner);
314}
315
316static void free_generic_stateid(struct nfs4_stateid *stp)
317{
318 put_nfs4_file(stp->st_file);
319 kmem_cache_free(stateid_slab, stp);
320}
321
322static void release_lock_stateid(struct nfs4_stateid *stp)
323{
324 unhash_generic_stateid(stp);
325 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
326 free_generic_stateid(stp);
327}
328
f044ff83
BF		 329static void unhash_lockowner(struct nfs4_stateowner *sop)
330{
331 struct nfs4_stateid *stp;
332
333 list_del(&sop->so_idhash);
334 list_del(&sop->so_strhash);
335 list_del(&sop->so_perstateid);
336 while (!list_empty(&sop->so_stateids)) {
337 stp = list_first_entry(&sop->so_stateids,
338 struct nfs4_stateid, st_perstateowner);
339 release_lock_stateid(stp);
340 }
341}
342
343static void release_lockowner(struct nfs4_stateowner *sop)
344{
345 unhash_lockowner(sop);
346 nfs4_put_stateowner(sop);
347}
348
f1d110ca
BF		 349static void
350release_stateid_lockowners(struct nfs4_stateid *open_stp)
351{
352 struct nfs4_stateowner *lock_sop;
353
354 while (!list_empty(&open_stp->st_lockowners)) {
355 lock_sop = list_entry(open_stp->st_lockowners.next,
356 struct nfs4_stateowner, so_perstateid);
357 /* list_del(&open_stp->st_lockowners); */
358 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 359 release_lockowner(lock_sop);
f1d110ca
BF		 360 }
361}
362
2283963f
BF		 363static void release_open_stateid(struct nfs4_stateid *stp)
364{
365 unhash_generic_stateid(stp);
366 release_stateid_lockowners(stp);
367 nfsd_close(stp->st_vfs_file);
368 free_generic_stateid(stp);
369}
370
f044ff83 371static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 372{
373 struct nfs4_stateid *stp;
374
375 list_del(&sop->so_idhash);
376 list_del(&sop->so_strhash);
f044ff83
BF		 377 list_del(&sop->so_perclient);
378 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 379 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 380 stp = list_first_entry(&sop->so_stateids,
381 struct nfs4_stateid, st_perstateowner);
382 release_open_stateid(stp);
f1d110ca
BF		 383 }
384}
385
f044ff83 386static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 387{
f044ff83 388 unhash_openowner(sop);
f1d110ca
BF		 389 list_del(&sop->so_close_lru);
390 nfs4_put_stateowner(sop);
391}
392
1da177e4
LT		 393static inline void
394renew_client(struct nfs4_client *clp)
395{
396 /*
397 * Move client to the end to the LRU list.
398 */
399 dprintk("renewing client (clientid %08x/%08x)\n",
400 clp->cl_clientid.cl_boot,
401 clp->cl_clientid.cl_id);
402 list_move_tail(&clp->cl_lru, &client_lru);
403 clp->cl_time = get_seconds();
404}
405
406/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
407static int
408STALE_CLIENTID(clientid_t *clid)
409{
410 if (clid->cl_boot == boot_time)
411 return 0;
412 dprintk("NFSD stale clientid (%08x/%08x)\n",
413 clid->cl_boot, clid->cl_id);
414 return 1;
415}
416
417/*
418 * XXX Should we use a slab cache ?
419 * This type of memory management is somewhat inefficient, but we use it
420 * anyway since SETCLIENTID is not a common operation.
421 */
35bba9a3 422static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 423{
424 struct nfs4_client *clp;
425
35bba9a3
BF		 426 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
427 if (clp == NULL)
428 return NULL;
429 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
430 if (clp->cl_name.data == NULL) {
431 kfree(clp);
432 return NULL;
1da177e4 433 }
35bba9a3
BF		 434 memcpy(clp->cl_name.data, name.data, name.len);
435 clp->cl_name.len = name.len;
1da177e4
LT		 436 return clp;
437}
438
1b1a9b31
BF		 439static void
440shutdown_callback_client(struct nfs4_client *clp)
441{
442 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
443
1b1a9b31 444 if (clnt) {
404ec117
BF		 445 /*
446 * Callback threads take a reference on the client, so there
447 * should be no outstanding callbacks at this point.
448 */
1b1a9b31
BF		 449 clp->cl_callback.cb_client = NULL;
450 rpc_shutdown_client(clnt);
451 }
452}
453
1da177e4
LT		 454static inline void
455free_client(struct nfs4_client *clp)
456{
1b1a9b31 457 shutdown_callback_client(clp);
1da177e4
LT		 458 if (clp->cl_cred.cr_group_info)
459 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 460 kfree(clp->cl_principal);
1da177e4
LT		 461 kfree(clp->cl_name.data);
462 kfree(clp);
463}
464
465void
466put_nfs4_client(struct nfs4_client *clp)
467{
468 if (atomic_dec_and_test(&clp->cl_count))
469 free_client(clp);
470}
471
472static void
473expire_client(struct nfs4_client *clp)
474{
475 struct nfs4_stateowner *sop;
476 struct nfs4_delegation *dp;
1da177e4
LT		 477 struct list_head reaplist;
478
479 dprintk("NFSD: expire_client cl_count %d\n",
480 atomic_read(&clp->cl_count));
481
1da177e4
LT		 482 INIT_LIST_HEAD(&reaplist);
483 spin_lock(&recall_lock);
ea1da636
N		 484 while (!list_empty(&clp->cl_delegations)) {
485 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 486 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
487 dp->dl_flock);
ea1da636 488 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 489 list_move(&dp->dl_recall_lru, &reaplist);
490 }
491 spin_unlock(&recall_lock);
492 while (!list_empty(&reaplist)) {
493 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
494 list_del_init(&dp->dl_recall_lru);
495 unhash_delegation(dp);
496 }
497 list_del(&clp->cl_idhash);
498 list_del(&clp->cl_strhash);
499 list_del(&clp->cl_lru);
ea1da636
N		 500 while (!list_empty(&clp->cl_openowners)) {
501 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 502 release_openowner(sop);
1da177e4
LT		 503 }
504 put_nfs4_client(clp);
505}
506
35bba9a3
BF		 507static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
508{
1da177e4
LT		 509 struct nfs4_client *clp;
510
35bba9a3
BF		 511 clp = alloc_client(name);
512 if (clp == NULL)
513 return NULL;
a55370a3 514 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 515 atomic_set(&clp->cl_count, 1);
516 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 517 INIT_LIST_HEAD(&clp->cl_idhash);
518 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 519 INIT_LIST_HEAD(&clp->cl_openowners);
520 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 521 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 522 return clp;
523}
524
35bba9a3
BF		 525static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
526{
527 memcpy(target->cl_verifier.data, source->data,
528 sizeof(target->cl_verifier.data));
1da177e4
LT		 529}
530
35bba9a3
BF		 531static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
532{
1da177e4
LT		 533 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
534 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
535}
536
35bba9a3
BF		 537static void copy_cred(struct svc_cred *target, struct svc_cred *source)
538{
1da177e4
LT		 539 target->cr_uid = source->cr_uid;
540 target->cr_gid = source->cr_gid;
541 target->cr_group_info = source->cr_group_info;
542 get_group_info(target->cr_group_info);
543}
544
35bba9a3 545static int same_name(const char *n1, const char *n2)
599e0a22 546{
a55370a3 547 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 548}
549
550static int
599e0a22
BF		 551same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
552{
553 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 554}
555
556static int
599e0a22
BF		 557same_clid(clientid_t *cl1, clientid_t *cl2)
558{
559 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 560}
561
562/* XXX what about NGROUP */
563static int
599e0a22
BF		 564same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
565{
566 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 567}
568
5ec7b46c
BF		 569static void gen_clid(struct nfs4_client *clp)
570{
571 static u32 current_clientid = 1;
572
1da177e4
LT		 573 clp->cl_clientid.cl_boot = boot_time;
574 clp->cl_clientid.cl_id = current_clientid++;
575}
576
deda2faa
BF		 577static void gen_confirm(struct nfs4_client *clp)
578{
579 static u32 i;
580 u32 *p;
1da177e4 581
1da177e4 582 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 583 *p++ = get_seconds();
584 *p++ = i++;
1da177e4
LT		 585}
586
35bba9a3
BF		 587static int check_name(struct xdr_netobj name)
588{
1da177e4
LT		 589 if (name.len == 0)
590 return 0;
591 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 592 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 593 return 0;
594 }
595 return 1;
596}
597
fd39ca9a 598static void
1da177e4
LT		 599add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
600{
601 unsigned int idhashval;
602
603 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
604 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
605 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
606 list_add_tail(&clp->cl_lru, &client_lru);
607 clp->cl_time = get_seconds();
608}
609
fd39ca9a 610static void
1da177e4
LT		 611move_to_confirmed(struct nfs4_client *clp)
612{
613 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
614 unsigned int strhashval;
615
616 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
617 list_del_init(&clp->cl_strhash);
f116629d 618 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 619 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 620 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
621 renew_client(clp);
622}
623
624static struct nfs4_client *
625find_confirmed_client(clientid_t *clid)
626{
627 struct nfs4_client *clp;
628 unsigned int idhashval = clientid_hashval(clid->cl_id);
629
630 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 631 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 632 return clp;
633 }
634 return NULL;
635}
636
637static struct nfs4_client *
638find_unconfirmed_client(clientid_t *clid)
639{
640 struct nfs4_client *clp;
641 unsigned int idhashval = clientid_hashval(clid->cl_id);
642
643 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 644 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 645 return clp;
646 }
647 return NULL;
648}
649
28ce6054
N		 650static struct nfs4_client *
651find_confirmed_client_by_str(const char *dname, unsigned int hashval)
652{
653 struct nfs4_client *clp;
654
655 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
656 if (same_name(clp->cl_recdir, dname))
657 return clp;
658 }
659 return NULL;
660}
661
662static struct nfs4_client *
663find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
664{
665 struct nfs4_client *clp;
666
667 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
668 if (same_name(clp->cl_recdir, dname))
669 return clp;
670 }
671 return NULL;
672}
673
1da177e4
LT		 674/* a helper function for parse_callback */
675static int
676parse_octet(unsigned int *lenp, char **addrp)
677{
678 unsigned int len = *lenp;
679 char *p = *addrp;
680 int n = -1;
681 char c;
682
683 for (;;) {
684 if (!len)
685 break;
686 len--;
687 c = *p++;
688 if (c == '.')
689 break;
690 if ((c < '0') || (c > '9')) {
691 n = -1;
692 break;
693 }
694 if (n < 0)
695 n = 0;
696 n = (n * 10) + (c - '0');
697 if (n > 255) {
698 n = -1;
699 break;
700 }
701 }
702 *lenp = len;
703 *addrp = p;
704 return n;
705}
706
707/* parse and set the setclientid ipv4 callback address */
fd39ca9a 708static int
1da177e4
LT		 709parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
710{
711 int temp = 0;
712 u32 cbaddr = 0;
713 u16 cbport = 0;
714 u32 addrlen = addr_len;
715 char *addr = addr_val;
716 int i, shift;
717
718 /* ipaddress */
719 shift = 24;
720 for(i = 4; i > 0 ; i--) {
721 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
722 return 0;
723 }
724 cbaddr |= (temp << shift);
725 if (shift > 0)
726 shift -= 8;
727 }
728 *cbaddrp = cbaddr;
729
730 /* port */
731 shift = 8;
732 for(i = 2; i > 0 ; i--) {
733 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
734 return 0;
735 }
736 cbport |= (temp << shift);
737 if (shift > 0)
738 shift -= 8;
739 }
740 *cbportp = cbport;
741 return 1;
742}
743
fd39ca9a 744static void
1da177e4
LT		 745gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
746{
747 struct nfs4_callback *cb = &clp->cl_callback;
748
749 /* Currently, we only support tcp for the callback channel */
750 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
751 goto out_err;
752
753 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
754 &cb->cb_addr, &cb->cb_port)))
755 goto out_err;
756 cb->cb_prog = se->se_callback_prog;
757 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 758 return;
759out_err:
849823c5 760 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 761 "will not receive delegations\n",
762 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
763
1da177e4
LT		 764 return;
765}
766
b37ad28b 767__be32
b591480b
BF		 768nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
769 struct nfsd4_setclientid *setclid)
1da177e4 770{
27459f09 771 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 772 struct xdr_netobj clname = {
773 .len = setclid->se_namelen,
774 .data = setclid->se_name,
775 };
776 nfs4_verifier clverifier = setclid->se_verf;
777 unsigned int strhashval;
28ce6054 778 struct nfs4_client *conf, *unconf, *new;
b37ad28b 779 __be32 status;
68e76ad0 780 char *princ;
a55370a3 781 char dname[HEXDIR_LEN];
1da177e4 782
1da177e4 783 if (!check_name(clname))
73aea4ec 784 return nfserr_inval;
1da177e4 785
a55370a3
N		 786 status = nfs4_make_rec_clidname(dname, &clname);
787 if (status)
73aea4ec 788 return status;
a55370a3 789
1da177e4
LT		 790 /*
791 * XXX The Duplicate Request Cache (DRC) has been checked (??)
792 * We get here on a DRC miss.
793 */
794
a55370a3 795 strhashval = clientstr_hashval(dname);
1da177e4 796
1da177e4 797 nfs4_lock_state();
28ce6054
N		 798 conf = find_confirmed_client_by_str(dname, strhashval);
799 if (conf) {
a186e767 800 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 801 status = nfserr_clid_inuse;
599e0a22 802 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 803 || conf->cl_addr != sin->sin_addr.s_addr) {
be859405
HH		 804 dprintk("NFSD: setclientid: string in use by clientat %pI4\n",
805 &conf->cl_addr);
1da177e4
LT		 806 goto out;
807 }
1da177e4 808 }
a186e767
BF		 809 /*
810 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
811 * has a description of SETCLIENTID request processing consisting
812 * of 5 bullet points, labeled as CASE0 - CASE4 below.
813 */
28ce6054 814 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 815 status = nfserr_resource;
816 if (!conf) {
a186e767
BF		 817 /*
818 * RFC 3530 14.2.33 CASE 4:
819 * placed first, because it is the normal case
1da177e4
LT		 820 */
821 if (unconf)
822 expire_client(unconf);
a55370a3
N		 823 new = create_client(clname, dname);
824 if (new == NULL)
1da177e4 825 goto out;
1da177e4 826 gen_clid(new);
599e0a22 827 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 828 /*
a186e767
BF		 829 * RFC 3530 14.2.33 CASE 1:
830 * probable callback update
1da177e4 831 */
31f4a6c1
N		 832 if (unconf) {
833 /* Note this is removing unconfirmed {*x***},
834 * which is stronger than RFC recommended {vxc**}.
835 * This has the advantage that there is at most
836 * one {*x***} in either list at any time.
837 */
838 expire_client(unconf);
1da177e4 839 }
a55370a3
N		 840 new = create_client(clname, dname);
841 if (new == NULL)
1da177e4 842 goto out;
1da177e4 843 copy_clid(new, conf);
1da177e4
LT		 844 } else if (!unconf) {
845 /*
a186e767
BF		 846 * RFC 3530 14.2.33 CASE 2:
847 * probable client reboot; state will be removed if
848 * confirmed.
1da177e4 849 */
a55370a3
N		 850 new = create_client(clname, dname);
851 if (new == NULL)
1da177e4 852 goto out;
1da177e4 853 gen_clid(new);
49ba8781 854 } else {
a186e767
BF		 855 /*
856 * RFC 3530 14.2.33 CASE 3:
857 * probable client reboot; state will be removed if
858 * confirmed.
1da177e4
LT		 859 */
860 expire_client(unconf);
a55370a3
N		 861 new = create_client(clname, dname);
862 if (new == NULL)
1da177e4 863 goto out;
1da177e4 864 gen_clid(new);
1da177e4 865 }
c175b83c
BF		 866 copy_verf(new, &clverifier);
867 new->cl_addr = sin->sin_addr.s_addr;
61054b14 868 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 869 princ = svc_gss_principal(rqstp);
870 if (princ) {
871 new->cl_principal = kstrdup(princ, GFP_KERNEL);
872 if (new->cl_principal == NULL) {
873 free_client(new);
874 goto out;
875 }
876 }
c175b83c
BF		 877 copy_cred(&new->cl_cred, &rqstp->rq_cred);
878 gen_confirm(new);
879 gen_callback(new, setclid);
880 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 881 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
882 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
883 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
884 status = nfs_ok;
885out:
886 nfs4_unlock_state();
887 return status;
888}
889
890
891/*
a186e767
BF		 892 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
893 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
894 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 895 */
b37ad28b 896__be32
b591480b
BF		 897nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
898 struct nfsd4_compound_state *cstate,
899 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 900{
27459f09 901 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 902 struct nfs4_client *conf, *unconf;
1da177e4
LT		 903 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
904 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 905 __be32 status;
1da177e4
LT		 906
907 if (STALE_CLIENTID(clid))
908 return nfserr_stale_clientid;
909 /*
910 * XXX The Duplicate Request Cache (DRC) has been checked (??)
911 * We get here on a DRC miss.
912 */
913
914 nfs4_lock_state();
21ab45a4
N		 915
916 conf = find_confirmed_client(clid);
917 unconf = find_unconfirmed_client(clid);
918
919 status = nfserr_clid_inuse;
27459f09 920 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 921 goto out;
27459f09 922 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 923 goto out;
924
a186e767
BF		 925 /*
926 * section 14.2.34 of RFC 3530 has a description of
927 * SETCLIENTID_CONFIRM request processing consisting
928 * of 4 bullet points, labeled as CASE1 - CASE4 below.
929 */
366e0c1d 930 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 931 /*
932 * RFC 3530 14.2.34 CASE 1:
933 * callback update
934 */
599e0a22 935 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 936 status = nfserr_clid_inuse;
937 else {
1a69c179
N		 938 /* XXX: We just turn off callbacks until we can handle
939 * change request correctly. */
cb36d634 940 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 941 gen_confirm(conf);
46309029 942 nfsd4_remove_clid_dir(unconf);
1a69c179 943 expire_client(unconf);
1da177e4 944 status = nfs_ok;
1a69c179 945
1da177e4 946 }
f3aba4e5 947 } else if (conf && !unconf) {
a186e767
BF		 948 /*
949 * RFC 3530 14.2.34 CASE 2:
950 * probable retransmitted request; play it safe and
951 * do nothing.
7c79f737 952 */
599e0a22 953 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 954 status = nfserr_clid_inuse;
21ab45a4 955 else
1da177e4 956 status = nfs_ok;
7c79f737 957 } else if (!conf && unconf
599e0a22 958 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 959 /*
960 * RFC 3530 14.2.34 CASE 3:
961 * Normal case; new or rebooted client:
7c79f737 962 */
599e0a22 963 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 964 status = nfserr_clid_inuse;
965 } else {
1a69c179
N		 966 unsigned int hash =
967 clientstr_hashval(unconf->cl_recdir);
968 conf = find_confirmed_client_by_str(unconf->cl_recdir,
969 hash);
970 if (conf) {
c7b9a459 971 nfsd4_remove_clid_dir(conf);
1a69c179
N		 972 expire_client(conf);
973 }
1da177e4 974 move_to_confirmed(unconf);
21ab45a4 975 conf = unconf;
46f8a64b 976 nfsd4_probe_callback(conf);
1a69c179 977 status = nfs_ok;
1da177e4 978 }
599e0a22
BF		 979 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
980 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 981 &confirm)))) {
a186e767
BF		 982 /*
983 * RFC 3530 14.2.34 CASE 4:
984 * Client probably hasn't noticed that we rebooted yet.
7c79f737 985 */
1da177e4 986 status = nfserr_stale_clientid;
7c79f737 987 } else {
08e8987c
N		 988 /* check that we have hit one of the cases...*/
989 status = nfserr_clid_inuse;
990 }
1da177e4 991out:
1da177e4
LT		 992 nfs4_unlock_state();
993 return status;
994}
995
1da177e4
LT		 996/* OPEN Share state helper functions */
997static inline struct nfs4_file *
998alloc_init_file(struct inode *ino)
999{
1000 struct nfs4_file *fp;
1001 unsigned int hashval = file_hashval(ino);
1002
e60d4398
N		 1003 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1004 if (fp) {
13cd2184 1005 kref_init(&fp->fi_ref);
1da177e4 1006 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1007 INIT_LIST_HEAD(&fp->fi_stateids);
1008 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1009 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1010 fp->fi_inode = igrab(ino);
1011 fp->fi_id = current_fileid++;
47f9940c 1012 fp->fi_had_conflict = false;
1da177e4
LT		 1013 return fp;
1014 }
1015 return NULL;
1016}
1017
e60d4398 1018static void
e18b890b 1019nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1020{
e60d4398
N		 1021 if (*slab == NULL)
1022 return;
1a1d92c1 1023 kmem_cache_destroy(*slab);
e60d4398 1024 *slab = NULL;
1da177e4
LT		 1025}
1026
e8ff2a84 1027void
1da177e4
LT		 1028nfsd4_free_slabs(void)
1029{
e60d4398
N		 1030 nfsd4_free_slab(&stateowner_slab);
1031 nfsd4_free_slab(&file_slab);
5ac049ac 1032 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1033 nfsd4_free_slab(&deleg_slab);
e60d4398 1034}
1da177e4 1035
e60d4398
N		 1036static int
1037nfsd4_init_slabs(void)
1038{
1039 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1040 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1041 if (stateowner_slab == NULL)
1042 goto out_nomem;
1043 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1044 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1045 if (file_slab == NULL)
1046 goto out_nomem;
5ac049ac 1047 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1048 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1049 if (stateid_slab == NULL)
1050 goto out_nomem;
5b2d21c1 1051 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1052 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1053 if (deleg_slab == NULL)
1054 goto out_nomem;
e60d4398
N		 1055 return 0;
1056out_nomem:
1057 nfsd4_free_slabs();
1058 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1059 return -ENOMEM;
1da177e4
LT		 1060}
1061
1062void
1063nfs4_free_stateowner(struct kref *kref)
1064{
1065 struct nfs4_stateowner *sop =
1066 container_of(kref, struct nfs4_stateowner, so_ref);
1067 kfree(sop->so_owner.data);
1068 kmem_cache_free(stateowner_slab, sop);
1069}
1070
1071static inline struct nfs4_stateowner *
1072alloc_stateowner(struct xdr_netobj *owner)
1073{
1074 struct nfs4_stateowner *sop;
1075
1076 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1077 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1078 memcpy(sop->so_owner.data, owner->data, owner->len);
1079 sop->so_owner.len = owner->len;
1080 kref_init(&sop->so_ref);
1081 return sop;
1082 }
1083 kmem_cache_free(stateowner_slab, sop);
1084 }
1085 return NULL;
1086}
1087
1088static struct nfs4_stateowner *
1089alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1090 struct nfs4_stateowner *sop;
1091 struct nfs4_replay *rp;
1092 unsigned int idhashval;
1093
1094 if (!(sop = alloc_stateowner(&open->op_owner)))
1095 return NULL;
1096 idhashval = ownerid_hashval(current_ownerid);
1097 INIT_LIST_HEAD(&sop->so_idhash);
1098 INIT_LIST_HEAD(&sop->so_strhash);
1099 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1100 INIT_LIST_HEAD(&sop->so_stateids);
1101 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1102 INIT_LIST_HEAD(&sop->so_close_lru);
1103 sop->so_time = 0;
1104 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1105 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1106 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1107 sop->so_is_open_owner = 1;
1108 sop->so_id = current_ownerid++;
1109 sop->so_client = clp;
1110 sop->so_seqid = open->op_seqid;
1111 sop->so_confirmed = 0;
1112 rp = &sop->so_replay;
de1ae286 1113 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1114 rp->rp_buflen = 0;
1115 rp->rp_buf = rp->rp_ibuf;
1116 return sop;
1117}
1118
1da177e4
LT		 1119static inline void
1120init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1121 struct nfs4_stateowner *sop = open->op_stateowner;
1122 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1123
1124 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1125 INIT_LIST_HEAD(&stp->st_perstateowner);
1126 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1127 INIT_LIST_HEAD(&stp->st_perfile);
1128 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1129 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1130 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1131 stp->st_stateowner = sop;
13cd2184 1132 get_nfs4_file(fp);
1da177e4
LT		 1133 stp->st_file = fp;
1134 stp->st_stateid.si_boot = boot_time;
1135 stp->st_stateid.si_stateownerid = sop->so_id;
1136 stp->st_stateid.si_fileid = fp->fi_id;
1137 stp->st_stateid.si_generation = 0;
1138 stp->st_access_bmap = 0;
1139 stp->st_deny_bmap = 0;
1140 __set_bit(open->op_share_access, &stp->st_access_bmap);
1141 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1142 stp->st_openstp = NULL;
1da177e4
LT		 1143}
1144
fd39ca9a 1145static void
1da177e4
LT		 1146move_to_close_lru(struct nfs4_stateowner *sop)
1147{
1148 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1149
358dd55a 1150 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1151 sop->so_time = get_seconds();
1152}
1153
1da177e4 1154static int
599e0a22
BF		 1155same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1156 clientid_t *clid)
1157{
1158 return (sop->so_owner.len == owner->len) &&
1159 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1160 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1161}
1162
1163static struct nfs4_stateowner *
1164find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1165{
1166 struct nfs4_stateowner *so = NULL;
1167
1168 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1169 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1170 return so;
1171 }
1172 return NULL;
1173}
1174
1175/* search file_hashtbl[] for file */
1176static struct nfs4_file *
1177find_file(struct inode *ino)
1178{
1179 unsigned int hashval = file_hashval(ino);
1180 struct nfs4_file *fp;
1181
1182 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1183 if (fp->fi_inode == ino) {
1184 get_nfs4_file(fp);
1da177e4 1185 return fp;
13cd2184 1186 }
1da177e4
LT		 1187 }
1188 return NULL;
1189}
1190
8838dc43 1191static inline int access_valid(u32 x)
ba5a6a19 1192{
8838dc43
BF		 1193 if (x < NFS4_SHARE_ACCESS_READ)
1194 return 0;
1195 if (x > NFS4_SHARE_ACCESS_BOTH)
1196 return 0;
1197 return 1;
ba5a6a19
BF		 1198}
1199
8838dc43 1200static inline int deny_valid(u32 x)
ba5a6a19 1201{
8838dc43
BF		 1202 /* Note: unlike access bits, deny bits may be zero. */
1203 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1204}
1da177e4 1205
4f83aa30
BF		 1206/*
1207 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1208 * st_{access,deny}_bmap field of the stateid, in order to track not
1209 * only what share bits are currently in force, but also what
1210 * combinations of share bits previous opens have used. This allows us
1211 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1212 * return an error if the client attempt to downgrade to a combination
1213 * of share bits not explicable by closing some of its previous opens.
1214 *
1215 * XXX: This enforcement is actually incomplete, since we don't keep
1216 * track of access/deny bit combinations; so, e.g., we allow:
1217 *
1218 * OPEN allow read, deny write
1219 * OPEN allow both, deny none
1220 * DOWNGRADE allow read, deny none
1221 *
1222 * which we should reject.
1223 */
fd39ca9a 1224static void
1da177e4
LT		 1225set_access(unsigned int *access, unsigned long bmap) {
1226 int i;
1227
1228 *access = 0;
1229 for (i = 1; i < 4; i++) {
1230 if (test_bit(i, &bmap))
1231 *access |= i;
1232 }
1233}
1234
fd39ca9a 1235static void
1da177e4
LT		 1236set_deny(unsigned int *deny, unsigned long bmap) {
1237 int i;
1238
1239 *deny = 0;
1240 for (i = 0; i < 4; i++) {
1241 if (test_bit(i, &bmap))
1242 *deny |= i ;
1243 }
1244}
1245
1246static int
1247test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1248 unsigned int access, deny;
1249
1250 set_access(&access, stp->st_access_bmap);
1251 set_deny(&deny, stp->st_deny_bmap);
1252 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1253 return 0;
1254 return 1;
1255}
1256
1257/*
1258 * Called to check deny when READ with all zero stateid or
1259 * WRITE with all zero or all one stateid
1260 */
b37ad28b 1261static __be32
1da177e4
LT		 1262nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1263{
1264 struct inode *ino = current_fh->fh_dentry->d_inode;
1265 struct nfs4_file *fp;
1266 struct nfs4_stateid *stp;
b37ad28b 1267 __be32 ret;
1da177e4
LT		 1268
1269 dprintk("NFSD: nfs4_share_conflict\n");
1270
1271 fp = find_file(ino);
13cd2184
N		 1272 if (!fp)
1273 return nfs_ok;
b700949b 1274 ret = nfserr_locked;
1da177e4 1275 /* Search for conflicting share reservations */
13cd2184
N		 1276 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1277 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1278 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1279 goto out;
1da177e4 1280 }
13cd2184
N		 1281 ret = nfs_ok;
1282out:
1283 put_nfs4_file(fp);
1284 return ret;
1da177e4
LT		 1285}
1286
1287static inline void
1288nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1289{
1290 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1291 drop_file_write_access(filp);
1da177e4
LT		 1292 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1293 }
1294}
1295
1296/*
1297 * Recall a delegation
1298 */
1299static int
1300do_recall(void *__dp)
1301{
1302 struct nfs4_delegation *dp = __dp;
1303
47f9940c 1304 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1305 nfsd4_cb_recall(dp);
1306 return 0;
1307}
1308
1309/*
1310 * Spawn a thread to perform a recall on the delegation represented
1311 * by the lease (file_lock)
1312 *
1313 * Called from break_lease() with lock_kernel() held.
1314 * Note: we assume break_lease will only call this *once* for any given
1315 * lease.
1316 */
1317static
1318void nfsd_break_deleg_cb(struct file_lock *fl)
1319{
1320 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1321 struct task_struct *t;
1322
1323 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1324 if (!dp)
1325 return;
1326
1327 /* We're assuming the state code never drops its reference
1328 * without first removing the lease. Since we're in this lease
1329 * callback (and since the lease code is serialized by the kernel
1330 * lock) we know the server hasn't removed the lease yet, we know
1331 * it's safe to take a reference: */
1332 atomic_inc(&dp->dl_count);
cfdcad4d 1333 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1334
1335 spin_lock(&recall_lock);
1336 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1337 spin_unlock(&recall_lock);
1338
1339 /* only place dl_time is set. protected by lock_kernel*/
1340 dp->dl_time = get_seconds();
1341
0272e1fd
BF		 1342 /*
1343 * We don't want the locks code to timeout the lease for us;
1344 * we'll remove it ourself if the delegation isn't returned
1345 * in time.
1346 */
1347 fl->fl_break_time = 0;
1da177e4
LT		 1348
1349 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1350 if (IS_ERR(t)) {
1351 struct nfs4_client *clp = dp->dl_client;
1352
1353 printk(KERN_INFO "NFSD: Callback thread failed for "
1354 "for client (clientid %08x/%08x)\n",
1355 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1356 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1357 nfs4_put_delegation(dp);
1358 }
1359}
1360
1361/*
1362 * The file_lock is being reapd.
1363 *
1364 * Called by locks_free_lock() with lock_kernel() held.
1365 */
1366static
1367void nfsd_release_deleg_cb(struct file_lock *fl)
1368{
1369 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1370
1371 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1372
1373 if (!(fl->fl_flags & FL_LEASE) || !dp)
1374 return;
1375 dp->dl_flock = NULL;
1376}
1377
1378/*
1379 * Set the delegation file_lock back pointer.
1380 *
a9933cea 1381 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1382 */
1383static
1384void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1385{
1386 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1387
1388 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1389 if (!dp)
1390 return;
1391 dp->dl_flock = new;
1392}
1393
1394/*
a9933cea 1395 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1396 */
1397static
1398int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1399{
1400 struct nfs4_delegation *onlistd =
1401 (struct nfs4_delegation *)onlist->fl_owner;
1402 struct nfs4_delegation *tryd =
1403 (struct nfs4_delegation *)try->fl_owner;
1404
1405 if (onlist->fl_lmops != try->fl_lmops)
1406 return 0;
1407
1408 return onlistd->dl_client == tryd->dl_client;
1409}
1410
1411
1412static
1413int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1414{
1415 if (arg & F_UNLCK)
1416 return lease_modify(onlist, arg);
1417 else
1418 return -EAGAIN;
1419}
1420
fd39ca9a 1421static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1422 .fl_break = nfsd_break_deleg_cb,
1423 .fl_release_private = nfsd_release_deleg_cb,
1424 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1425 .fl_mylease = nfsd_same_client_deleg_cb,
1426 .fl_change = nfsd_change_deleg_cb,
1427};
1428
1429
b37ad28b 1430__be32
1da177e4
LT		 1431nfsd4_process_open1(struct nfsd4_open *open)
1432{
1da177e4
LT		 1433 clientid_t *clientid = &open->op_clientid;
1434 struct nfs4_client *clp = NULL;
1435 unsigned int strhashval;
1436 struct nfs4_stateowner *sop = NULL;
1437
1da177e4 1438 if (!check_name(open->op_owner))
0f442aa2 1439 return nfserr_inval;
1da177e4
LT		 1440
1441 if (STALE_CLIENTID(&open->op_clientid))
1442 return nfserr_stale_clientid;
1443
1444 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1445 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1446 open->op_stateowner = sop;
1447 if (!sop) {
1448 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1449 clp = find_confirmed_client(clientid);
1450 if (clp == NULL)
0f442aa2
BF		 1451 return nfserr_expired;
1452 goto renew;
1da177e4 1453 }
0f442aa2
BF		 1454 if (!sop->so_confirmed) {
1455 /* Replace unconfirmed owners without checking for replay. */
1456 clp = sop->so_client;
f044ff83 1457 release_openowner(sop);
0f442aa2
BF		 1458 open->op_stateowner = NULL;
1459 goto renew;
1460 }
1461 if (open->op_seqid == sop->so_seqid - 1) {
1462 if (sop->so_replay.rp_buflen)
a90b061c 1463 return nfserr_replay_me;
0f442aa2
BF		 1464 /* The original OPEN failed so spectacularly
1465 * that we don't even have replay data saved!
1466 * Therefore, we have no choice but to continue
1467 * processing this OPEN; presumably, we'll
1468 * fail again for the same reason.
1469 */
1470 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1471 goto renew;
1472 }
1473 if (open->op_seqid != sop->so_seqid)
1474 return nfserr_bad_seqid;
1da177e4 1475renew:
0f442aa2
BF		 1476 if (open->op_stateowner == NULL) {
1477 sop = alloc_init_open_stateowner(strhashval, clp, open);
1478 if (sop == NULL)
1479 return nfserr_resource;
1480 open->op_stateowner = sop;
1481 }
1482 list_del_init(&sop->so_close_lru);
1da177e4 1483 renew_client(sop->so_client);
0f442aa2 1484 return nfs_ok;
1da177e4
LT		 1485}
1486
b37ad28b 1487static inline __be32
4a6e43e6
N		 1488nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1489{
1490 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1491 return nfserr_openmode;
1492 else
1493 return nfs_ok;
1494}
1495
52f4fb43
N		 1496static struct nfs4_delegation *
1497find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1498{
1499 struct nfs4_delegation *dp;
1500
ea1da636 1501 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1502 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1503 return dp;
1504 }
1505 return NULL;
1506}
1507
b37ad28b 1508static __be32
567d9829
N		 1509nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1510 struct nfs4_delegation **dp)
1511{
1512 int flags;
b37ad28b 1513 __be32 status = nfserr_bad_stateid;
567d9829
N		 1514
1515 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1516 if (*dp == NULL)
c44c5eeb 1517 goto out;
567d9829
N		 1518 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1519 RD_STATE : WR_STATE;
1520 status = nfs4_check_delegmode(*dp, flags);
1521 if (status)
1522 *dp = NULL;
c44c5eeb
N		 1523out:
1524 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1525 return nfs_ok;
1526 if (status)
1527 return status;
1528 open->op_stateowner->so_confirmed = 1;
1529 return nfs_ok;
567d9829
N		 1530}
1531
b37ad28b 1532static __be32
1da177e4
LT		 1533nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1534{
1535 struct nfs4_stateid *local;
b37ad28b 1536 __be32 status = nfserr_share_denied;
1da177e4
LT		 1537 struct nfs4_stateowner *sop = open->op_stateowner;
1538
8beefa24 1539 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1540 /* ignore lock owners */
1541 if (local->st_stateowner->so_is_open_owner == 0)
1542 continue;
1543 /* remember if we have seen this open owner */
1544 if (local->st_stateowner == sop)
1545 *stpp = local;
1546 /* check for conflicting share reservations */
1547 if (!test_share(local, open))
1548 goto out;
1549 }
1550 status = 0;
1551out:
1552 return status;
1553}
1554
5ac049ac
N		 1555static inline struct nfs4_stateid *
1556nfs4_alloc_stateid(void)
1557{
1558 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1559}
1560
b37ad28b 1561static __be32
1da177e4 1562nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1563 struct nfs4_delegation *dp,
1da177e4
LT		 1564 struct svc_fh *cur_fh, int flags)
1565{
1566 struct nfs4_stateid *stp;
1da177e4 1567
5ac049ac 1568 stp = nfs4_alloc_stateid();
1da177e4
LT		 1569 if (stp == NULL)
1570 return nfserr_resource;
1571
567d9829
N		 1572 if (dp) {
1573 get_file(dp->dl_vfs_file);
1574 stp->st_vfs_file = dp->dl_vfs_file;
1575 } else {
b37ad28b 1576 __be32 status;
567d9829
N		 1577 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1578 &stp->st_vfs_file);
1579 if (status) {
1580 if (status == nfserr_dropit)
1581 status = nfserr_jukebox;
5ac049ac 1582 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1583 return status;
1584 }
1da177e4 1585 }
1da177e4
LT		 1586 *stpp = stp;
1587 return 0;
1588}
1589
b37ad28b 1590static inline __be32
1da177e4
LT		 1591nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1592 struct nfsd4_open *open)
1593{
1594 struct iattr iattr = {
1595 .ia_valid = ATTR_SIZE,
1596 .ia_size = 0,
1597 };
1598 if (!open->op_truncate)
1599 return 0;
1600 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1601 return nfserr_inval;
1da177e4
LT		 1602 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1603}
1604
b37ad28b 1605static __be32
1da177e4
LT		 1606nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1607{
1608 struct file *filp = stp->st_vfs_file;
7eaa36e2 1609 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1610 unsigned int share_access, new_writer;
b37ad28b 1611 __be32 status;
1da177e4
LT		 1612
1613 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1614 new_writer = (~share_access) & open->op_share_access
1615 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1616
6c26d08f 1617 if (new_writer) {
b37ad28b
AV		 1618 int err = get_write_access(inode);
1619 if (err)
1620 return nfserrno(err);
e518f056
BH		 1621 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1622 if (err)
1623 return nfserrno(err);
1624 file_take_write(filp);
6c26d08f 1625 }
1da177e4
LT		 1626 status = nfsd4_truncate(rqstp, cur_fh, open);
1627 if (status) {
6c26d08f
BF		 1628 if (new_writer)
1629 put_write_access(inode);
1da177e4
LT		 1630 return status;
1631 }
1632 /* remember the open */
6c26d08f 1633 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1634 __set_bit(open->op_share_access, &stp->st_access_bmap);
1635 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1636
1637 return nfs_ok;
1638}
1639
1640
1da177e4 1641static void
37515177 1642nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1643{
37515177
N		 1644 open->op_stateowner->so_confirmed = 1;
1645 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1646}
1647
1648/*
1649 * Attempt to hand out a delegation.
1650 */
1651static void
1652nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1653{
1654 struct nfs4_delegation *dp;
1655 struct nfs4_stateowner *sop = stp->st_stateowner;
1656 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1657 struct file_lock fl, *flp = &fl;
1658 int status, flag = 0;
1659
1660 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1661 open->op_recall = 0;
1662 switch (open->op_claim_type) {
1663 case NFS4_OPEN_CLAIM_PREVIOUS:
1664 if (!atomic_read(&cb->cb_set))
1665 open->op_recall = 1;
1666 flag = open->op_delegate_type;
1667 if (flag == NFS4_OPEN_DELEGATE_NONE)
1668 goto out;
1669 break;
1670 case NFS4_OPEN_CLAIM_NULL:
1671 /* Let's not give out any delegations till everyone's
1672 * had the chance to reclaim theirs.... */
af558e33 1673 if (locks_in_grace())
7b190fec
N		 1674 goto out;
1675 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1676 goto out;
1677 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1678 flag = NFS4_OPEN_DELEGATE_WRITE;
1679 else
1680 flag = NFS4_OPEN_DELEGATE_READ;
1681 break;
1682 default:
1683 goto out;
1684 }
1da177e4
LT		 1685
1686 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1687 if (dp == NULL) {
1688 flag = NFS4_OPEN_DELEGATE_NONE;
1689 goto out;
1690 }
1691 locks_init_lock(&fl);
1692 fl.fl_lmops = &nfsd_lease_mng_ops;
1693 fl.fl_flags = FL_LEASE;
9167f501 1694 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1695 fl.fl_end = OFFSET_MAX;
1696 fl.fl_owner = (fl_owner_t)dp;
1697 fl.fl_file = stp->st_vfs_file;
1698 fl.fl_pid = current->tgid;
1699
a9933cea 1700 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1701 * the lock_manager callbacks fl_mylease and fl_change are used
1702 */
9167f501 1703 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1704 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1705 unhash_delegation(dp);
1da177e4
LT		 1706 flag = NFS4_OPEN_DELEGATE_NONE;
1707 goto out;
1708 }
1709
1710 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1711
1712 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1713 dp->dl_stateid.si_boot,
1714 dp->dl_stateid.si_stateownerid,
1715 dp->dl_stateid.si_fileid,
1716 dp->dl_stateid.si_generation);
1717out:
7b190fec
N		 1718 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1719 && flag == NFS4_OPEN_DELEGATE_NONE
1720 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1721 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1722 open->op_delegate_type = flag;
1723}
1724
1725/*
1726 * called with nfs4_lock_state() held.
1727 */
b37ad28b 1728__be32
1da177e4
LT		 1729nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1730{
1731 struct nfs4_file *fp = NULL;
1732 struct inode *ino = current_fh->fh_dentry->d_inode;
1733 struct nfs4_stateid *stp = NULL;
567d9829 1734 struct nfs4_delegation *dp = NULL;
b37ad28b 1735 __be32 status;
1da177e4
LT		 1736
1737 status = nfserr_inval;
ba5a6a19
BF		 1738 if (!access_valid(open->op_share_access)
1739 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1740 goto out;
1741 /*
1742 * Lookup file; if found, lookup stateid and check open request,
1743 * and check for delegations in the process of being recalled.
1744 * If not found, create the nfs4_file struct
1745 */
1746 fp = find_file(ino);
1747 if (fp) {
1748 if ((status = nfs4_check_open(fp, open, &stp)))
1749 goto out;
c44c5eeb
N		 1750 status = nfs4_check_deleg(fp, open, &dp);
1751 if (status)
1752 goto out;
1da177e4 1753 } else {
c44c5eeb
N		 1754 status = nfserr_bad_stateid;
1755 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1756 goto out;
1da177e4
LT		 1757 status = nfserr_resource;
1758 fp = alloc_init_file(ino);
1759 if (fp == NULL)
1760 goto out;
1761 }
1762
1763 /*
1764 * OPEN the file, or upgrade an existing OPEN.
1765 * If truncate fails, the OPEN fails.
1766 */
1767 if (stp) {
1768 /* Stateid was found, this is an OPEN upgrade */
1769 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1770 if (status)
1771 goto out;
444c2c07 1772 update_stateid(&stp->st_stateid);
1da177e4
LT		 1773 } else {
1774 /* Stateid was not found, this is a new OPEN */
1775 int flags = 0;
9ecb6a08 1776 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 1777 flags |= NFSD_MAY_READ;
1da177e4 1778 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 1779 flags |= NFSD_MAY_WRITE;
567d9829
N		 1780 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1781 if (status)
1da177e4
LT		 1782 goto out;
1783 init_stateid(stp, fp, open);
1784 status = nfsd4_truncate(rqstp, current_fh, open);
1785 if (status) {
2283963f 1786 release_open_stateid(stp);
1da177e4
LT		 1787 goto out;
1788 }
1789 }
1790 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1791
1792 /*
1793 * Attempt to hand out a delegation. No error return, because the
1794 * OPEN succeeds even if we fail.
1795 */
1796 nfs4_open_delegation(current_fh, open, stp);
1797
1798 status = nfs_ok;
1799
1800 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1801 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1802 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1803out:
13cd2184
N		 1804 if (fp)
1805 put_nfs4_file(fp);
37515177
N		 1806 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1807 nfs4_set_claim_prev(open);
1da177e4
LT		 1808 /*
1809 * To finish the open response, we just need to set the rflags.
1810 */
1811 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1812 if (!open->op_stateowner->so_confirmed)
1813 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1814
1815 return status;
1816}
1817
b37ad28b 1818__be32
b591480b
BF		 1819nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1820 clientid_t *clid)
1da177e4
LT		 1821{
1822 struct nfs4_client *clp;
b37ad28b 1823 __be32 status;
1da177e4
LT		 1824
1825 nfs4_lock_state();
1826 dprintk("process_renew(%08x/%08x): starting\n",
1827 clid->cl_boot, clid->cl_id);
1828 status = nfserr_stale_clientid;
1829 if (STALE_CLIENTID(clid))
1830 goto out;
1831 clp = find_confirmed_client(clid);
1832 status = nfserr_expired;
1833 if (clp == NULL) {
1834 /* We assume the client took too long to RENEW. */
1835 dprintk("nfsd4_renew: clientid not found!\n");
1836 goto out;
1837 }
1838 renew_client(clp);
1839 status = nfserr_cb_path_down;
ea1da636 1840 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1841 && !atomic_read(&clp->cl_callback.cb_set))
1842 goto out;
1843 status = nfs_ok;
1844out:
1845 nfs4_unlock_state();
1846 return status;
1847}
1848
af558e33
BF		 1849struct lock_manager nfsd4_manager = {
1850};
1851
a76b4319 1852static void
af558e33 1853nfsd4_end_grace(void)
a76b4319
N		 1854{
1855 dprintk("NFSD: end of grace period\n");
c7b9a459 1856 nfsd4_recdir_purge_old();
af558e33 1857 locks_end_grace(&nfsd4_manager);
a76b4319
N		 1858}
1859
fd39ca9a 1860static time_t
1da177e4
LT		 1861nfs4_laundromat(void)
1862{
1863 struct nfs4_client *clp;
1864 struct nfs4_stateowner *sop;
1865 struct nfs4_delegation *dp;
1866 struct list_head *pos, *next, reaplist;
1867 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1868 time_t t, clientid_val = NFSD_LEASE_TIME;
1869 time_t u, test_val = NFSD_LEASE_TIME;
1870
1871 nfs4_lock_state();
1872
1873 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 1874 if (locks_in_grace())
1875 nfsd4_end_grace();
1da177e4
LT		 1876 list_for_each_safe(pos, next, &client_lru) {
1877 clp = list_entry(pos, struct nfs4_client, cl_lru);
1878 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1879 t = clp->cl_time - cutoff;
1880 if (clientid_val > t)
1881 clientid_val = t;
1882 break;
1883 }
1884 dprintk("NFSD: purging unused client (clientid %08x)\n",
1885 clp->cl_clientid.cl_id);
c7b9a459 1886 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1887 expire_client(clp);
1888 }
1889 INIT_LIST_HEAD(&reaplist);
1890 spin_lock(&recall_lock);
1891 list_for_each_safe(pos, next, &del_recall_lru) {
1892 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1893 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1894 u = dp->dl_time - cutoff;
1895 if (test_val > u)
1896 test_val = u;
1897 break;
1898 }
1899 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1900 dp, dp->dl_flock);
1901 list_move(&dp->dl_recall_lru, &reaplist);
1902 }
1903 spin_unlock(&recall_lock);
1904 list_for_each_safe(pos, next, &reaplist) {
1905 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1906 list_del_init(&dp->dl_recall_lru);
1907 unhash_delegation(dp);
1908 }
1909 test_val = NFSD_LEASE_TIME;
1910 list_for_each_safe(pos, next, &close_lru) {
1911 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1912 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1913 u = sop->so_time - cutoff;
1914 if (test_val > u)
1915 test_val = u;
1916 break;
1917 }
1918 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1919 sop->so_id);
f044ff83 1920 release_openowner(sop);
1da177e4
LT		 1921 }
1922 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1923 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1924 nfs4_unlock_state();
1925 return clientid_val;
1926}
1927
a254b246
HH		 1928static struct workqueue_struct *laundry_wq;
1929static void laundromat_main(struct work_struct *);
1930static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1931
1932static void
c4028958 1933laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1934{
1935 time_t t;
1936
1937 t = nfs4_laundromat();
1938 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1939 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1940}
1941
fd39ca9a 1942static struct nfs4_stateowner *
f8816512
N		 1943search_close_lru(u32 st_id, int flags)
1944{
1da177e4
LT		 1945 struct nfs4_stateowner *local = NULL;
1946
1da177e4
LT		 1947 if (flags & CLOSE_STATE) {
1948 list_for_each_entry(local, &close_lru, so_close_lru) {
1949 if (local->so_id == st_id)
1950 return local;
1951 }
1952 }
1953 return NULL;
1954}
1955
1956static inline int
1957nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1958{
7eaa36e2 1959 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1960}
1961
1962static int
1963STALE_STATEID(stateid_t *stateid)
1964{
1965 if (stateid->si_boot == boot_time)
1966 return 0;
849823c5 1967 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1968 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1969 stateid->si_generation);
1970 return 1;
1971}
1972
1973static inline int
1974access_permit_read(unsigned long access_bmap)
1975{
1976 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1977 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1978 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1979}
1980
1981static inline int
1982access_permit_write(unsigned long access_bmap)
1983{
1984 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1985 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1986}
1987
1988static
b37ad28b 1989__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1990{
b37ad28b 1991 __be32 status = nfserr_openmode;
1da177e4
LT		 1992
1993 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1994 goto out;
1995 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1996 goto out;
1997 status = nfs_ok;
1998out:
1999 return status;
2000}
2001
b37ad28b 2002static inline __be32
1da177e4
LT		 2003check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2004{
2005 /* Trying to call delegreturn with a special stateid? Yuch: */
2006 if (!(flags & (RD_STATE | WR_STATE)))
2007 return nfserr_bad_stateid;
2008 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2009 return nfs_ok;
af558e33 2010 else if (locks_in_grace()) {
1da177e4
LT		 2011 /* Answer in remaining cases depends on existance of
2012 * conflicting state; so we must wait out the grace period. */
2013 return nfserr_grace;
2014 } else if (flags & WR_STATE)
2015 return nfs4_share_conflict(current_fh,
2016 NFS4_SHARE_DENY_WRITE);
2017 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2018 return nfs4_share_conflict(current_fh,
2019 NFS4_SHARE_DENY_READ);
2020}
2021
2022/*
2023 * Allow READ/WRITE during grace period on recovered state only for files
2024 * that are not able to provide mandatory locking.
2025 */
2026static inline int
2027io_during_grace_disallowed(struct inode *inode, int flags)
2028{
af558e33 2029 return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 2030 && mandatory_lock(inode);
1da177e4
LT		 2031}
2032
0836f587
BF		 2033static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2034{
2035 /* If the client sends us a stateid from the future, it's buggy: */
2036 if (in->si_generation > ref->si_generation)
2037 return nfserr_bad_stateid;
2038 /*
2039 * The following, however, can happen. For example, if the
2040 * client sends an open and some IO at the same time, the open
2041 * may bump si_generation while the IO is still in flight.
2042 * Thanks to hard links and renames, the client never knows what
2043 * file an open will affect. So it could avoid that situation
2044 * only by serializing all opens and IO from the same open
2045 * owner. To recover from the old_stateid error, the client
2046 * will just have to retry the IO:
2047 */
2048 if (in->si_generation < ref->si_generation)
2049 return nfserr_old_stateid;
2050 return nfs_ok;
2051}
2052
1da177e4
LT		 2053/*
2054* Checks for stateid operations
2055*/
b37ad28b 2056__be32
1da177e4
LT		 2057nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2058{
2059 struct nfs4_stateid *stp = NULL;
2060 struct nfs4_delegation *dp = NULL;
2061 stateid_t *stidp;
2062 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2063 __be32 status;
1da177e4
LT		 2064
2065 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2066 stateid->si_boot, stateid->si_stateownerid,
2067 stateid->si_fileid, stateid->si_generation);
2068 if (filpp)
2069 *filpp = NULL;
2070
2071 if (io_during_grace_disallowed(ino, flags))
2072 return nfserr_grace;
2073
2074 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2075 return check_special_stateids(current_fh, stateid, flags);
2076
2077 /* STALE STATEID */
2078 status = nfserr_stale_stateid;
2079 if (STALE_STATEID(stateid))
2080 goto out;
2081
2082 /* BAD STATEID */
2083 status = nfserr_bad_stateid;
2084 if (!stateid->si_fileid) { /* delegation stateid */
2085 if(!(dp = find_delegation_stateid(ino, stateid))) {
2086 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2087 goto out;
2088 }
2089 stidp = &dp->dl_stateid;
2090 } else { /* open or lock stateid */
2091 if (!(stp = find_stateid(stateid, flags))) {
2092 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2093 goto out;
2094 }
2095 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2096 goto out;
2097 if (!stp->st_stateowner->so_confirmed)
2098 goto out;
2099 stidp = &stp->st_stateid;
2100 }
0836f587
BF		 2101 status = check_stateid_generation(stateid, stidp);
2102 if (status)
1da177e4
LT		 2103 goto out;
2104 if (stp) {
2105 if ((status = nfs4_check_openmode(stp,flags)))
2106 goto out;
2107 renew_client(stp->st_stateowner->so_client);
2108 if (filpp)
2109 *filpp = stp->st_vfs_file;
6a85fa3a 2110 } else {
1da177e4
LT		 2111 if ((status = nfs4_check_delegmode(dp, flags)))
2112 goto out;
2113 renew_client(dp->dl_client);
2114 if (flags & DELEG_RET)
2115 unhash_delegation(dp);
2116 if (filpp)
2117 *filpp = dp->dl_vfs_file;
2118 }
2119 status = nfs_ok;
2120out:
2121 return status;
2122}
2123
4c4cd222
N		 2124static inline int
2125setlkflg (int type)
2126{
2127 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2128 RD_STATE : WR_STATE;
2129}
1da177e4
LT		 2130
2131/*
2132 * Checks for sequence id mutating operations.
2133 */
b37ad28b 2134static __be32
4c4cd222 2135nfs4_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 2136{
1da177e4
LT		 2137 struct nfs4_stateid *stp;
2138 struct nfs4_stateowner *sop;
0836f587 2139 __be32 status;
1da177e4
LT		 2140
2141 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2142 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2143 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2144 stateid->si_generation);
3a4f98bb 2145
1da177e4
LT		 2146 *stpp = NULL;
2147 *sopp = NULL;
2148
1da177e4 2149 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2150 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2151 return nfserr_bad_stateid;
1da177e4
LT		 2152 }
2153
1da177e4 2154 if (STALE_STATEID(stateid))
3a4f98bb 2155 return nfserr_stale_stateid;
1da177e4
LT		 2156 /*
2157 * We return BAD_STATEID if filehandle doesn't match stateid,
2158 * the confirmed flag is incorrecly set, or the generation
2159 * number is incorrect.
1da177e4 2160 */
f8816512
N		 2161 stp = find_stateid(stateid, flags);
2162 if (stp == NULL) {
2163 /*
2164 * Also, we should make sure this isn't just the result of
2165 * a replayed close:
2166 */
2167 sop = search_close_lru(stateid->si_stateownerid, flags);
2168 if (sop == NULL)
2169 return nfserr_bad_stateid;
2170 *sopp = sop;
2171 goto check_replay;
2172 }
1da177e4 2173
39325bd0
BF		 2174 *stpp = stp;
2175 *sopp = sop = stp->st_stateowner;
2176
4c4cd222 2177 if (lock) {
4c4cd222 2178 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2179 struct nfs4_client *clp = sop->so_client;
4c4cd222 2180 int lkflg = 0;
b37ad28b 2181 __be32 status;
4c4cd222
N		 2182
2183 lkflg = setlkflg(lock->lk_type);
2184
2185 if (lock->lk_is_new) {
599e0a22
BF		 2186 if (!sop->so_is_open_owner)
2187 return nfserr_bad_stateid;
2188 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2189 return nfserr_bad_stateid;
599e0a22
BF		 2190 /* stp is the open stateid */
2191 status = nfs4_check_openmode(stp, lkflg);
2192 if (status)
2193 return status;
2194 } else {
2195 /* stp is the lock stateid */
2196 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2197 if (status)
2198 return status;
4c4cd222 2199 }
1da177e4
LT		 2200 }
2201
f3362737 2202 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2203 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2204 return nfserr_bad_stateid;
1da177e4
LT		 2205 }
2206
1da177e4
LT		 2207 /*
2208 * We now validate the seqid and stateid generation numbers.
2209 * For the moment, we ignore the possibility of
2210 * generation number wraparound.
2211 */
bd9aac52 2212 if (seqid != sop->so_seqid)
1da177e4
LT		 2213 goto check_replay;
2214
3a4f98bb 2215 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2216 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2217 " unconfirmed stateowner!\n");
2218 return nfserr_bad_stateid;
1da177e4 2219 }
3a4f98bb 2220 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2221 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2222 " confirmed yet!\n");
2223 return nfserr_bad_stateid;
1da177e4 2224 }
0836f587
BF		 2225 status = check_stateid_generation(stateid, &stp->st_stateid);
2226 if (status)
2227 return status;
52fd004e 2228 renew_client(sop->so_client);
3a4f98bb 2229 return nfs_ok;
1da177e4 2230
1da177e4 2231check_replay:
bd9aac52 2232 if (seqid == sop->so_seqid - 1) {
849823c5 2233 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2234 /* indicate replay to calling function */
a90b061c 2235 return nfserr_replay_me;
1da177e4 2236 }
2fdada03 2237 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2238 sop->so_seqid, seqid);
2239 *sopp = NULL;
2240 return nfserr_bad_seqid;
1da177e4
LT		 2241}
2242
b37ad28b 2243__be32
ca364317 2244nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2245 struct nfsd4_open_confirm *oc)
1da177e4 2246{
b37ad28b 2247 __be32 status;
1da177e4
LT		 2248 struct nfs4_stateowner *sop;
2249 struct nfs4_stateid *stp;
2250
2251 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2252 (int)cstate->current_fh.fh_dentry->d_name.len,
2253 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2254
ca364317 2255 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2256 if (status)
2257 return status;
1da177e4
LT		 2258
2259 nfs4_lock_state();
2260
ca364317
BF		 2261 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2262 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2263 CONFIRM | OPEN_STATE,
1da177e4
LT		 2264 &oc->oc_stateowner, &stp, NULL)))
2265 goto out;
2266
2267 sop = oc->oc_stateowner;
2268 sop->so_confirmed = 1;
2269 update_stateid(&stp->st_stateid);
2270 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2271 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2272 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2273 stp->st_stateid.si_boot,
2274 stp->st_stateid.si_stateownerid,
2275 stp->st_stateid.si_fileid,
2276 stp->st_stateid.si_generation);
c7b9a459
N		 2277
2278 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2279out:
f2327d9a 2280 if (oc->oc_stateowner) {
1da177e4 2281 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2282 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2283 }
1da177e4
LT		 2284 nfs4_unlock_state();
2285 return status;
2286}
2287
2288
2289/*
2290 * unset all bits in union bitmap (bmap) that
2291 * do not exist in share (from successful OPEN_DOWNGRADE)
2292 */
2293static void
2294reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2295{
2296 int i;
2297 for (i = 1; i < 4; i++) {
2298 if ((i & access) != i)
2299 __clear_bit(i, bmap);
2300 }
2301}
2302
2303static void
2304reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2305{
2306 int i;
2307 for (i = 0; i < 4; i++) {
2308 if ((i & deny) != i)
2309 __clear_bit(i, bmap);
2310 }
2311}
2312
b37ad28b 2313__be32
ca364317
BF		 2314nfsd4_open_downgrade(struct svc_rqst *rqstp,
2315 struct nfsd4_compound_state *cstate,
a4f1706a 2316 struct nfsd4_open_downgrade *od)
1da177e4 2317{
b37ad28b 2318 __be32 status;
1da177e4
LT		 2319 struct nfs4_stateid *stp;
2320 unsigned int share_access;
2321
2322 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2323 (int)cstate->current_fh.fh_dentry->d_name.len,
2324 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2325
ba5a6a19
BF		 2326 if (!access_valid(od->od_share_access)
2327 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2328 return nfserr_inval;
2329
2330 nfs4_lock_state();
ca364317
BF		 2331 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2332 od->od_seqid,
1da177e4 2333 &od->od_stateid,
f3362737 2334 OPEN_STATE,
1da177e4
LT		 2335 &od->od_stateowner, &stp, NULL)))
2336 goto out;
2337
2338 status = nfserr_inval;
2339 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2340 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2341 stp->st_access_bmap, od->od_share_access);
2342 goto out;
2343 }
2344 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2345 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2346 stp->st_deny_bmap, od->od_share_deny);
2347 goto out;
2348 }
2349 set_access(&share_access, stp->st_access_bmap);
2350 nfs4_file_downgrade(stp->st_vfs_file,
2351 share_access & ~od->od_share_access);
2352
2353 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2354 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2355
2356 update_stateid(&stp->st_stateid);
2357 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2358 status = nfs_ok;
2359out:
f2327d9a 2360 if (od->od_stateowner) {
1da177e4 2361 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2362 cstate->replay_owner = od->od_stateowner;
f2327d9a 2363 }
1da177e4
LT		 2364 nfs4_unlock_state();
2365 return status;
2366}
2367
2368/*
2369 * nfs4_unlock_state() called after encode
2370 */
b37ad28b 2371__be32
ca364317 2372nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2373 struct nfsd4_close *close)
1da177e4 2374{
b37ad28b 2375 __be32 status;
1da177e4
LT		 2376 struct nfs4_stateid *stp;
2377
2378 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2379 (int)cstate->current_fh.fh_dentry->d_name.len,
2380 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2381
2382 nfs4_lock_state();
2383 /* check close_lru for replay */
ca364317
BF		 2384 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2385 close->cl_seqid,
1da177e4 2386 &close->cl_stateid,
f3362737 2387 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2388 &close->cl_stateowner, &stp, NULL)))
2389 goto out;
1da177e4
LT		 2390 status = nfs_ok;
2391 update_stateid(&stp->st_stateid);
2392 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2393
04ef5954 2394 /* release_stateid() calls nfsd_close() if needed */
2283963f 2395 release_open_stateid(stp);
04ef5954
BF		 2396
2397 /* place unused nfs4_stateowners on so_close_lru list to be
2398 * released by the laundromat service after the lease period
2399 * to enable us to handle CLOSE replay
2400 */
2401 if (list_empty(&close->cl_stateowner->so_stateids))
2402 move_to_close_lru(close->cl_stateowner);
1da177e4 2403out:
f2327d9a 2404 if (close->cl_stateowner) {
1da177e4 2405 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2406 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2407 }
1da177e4
LT		 2408 nfs4_unlock_state();
2409 return status;
2410}
2411
b37ad28b 2412__be32
ca364317
BF		 2413nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2414 struct nfsd4_delegreturn *dr)
1da177e4 2415{
b37ad28b 2416 __be32 status;
1da177e4 2417
ca364317 2418 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2419 goto out;
2420
2421 nfs4_lock_state();
ca364317
BF		 2422 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2423 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2424 nfs4_unlock_state();
2425out:
2426 return status;
2427}
2428
2429
2430/*
2431 * Lock owner state (byte-range locks)
2432 */
2433#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2434#define LOCK_HASH_BITS 8
2435#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2436#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2437
87df4de8
BH		 2438static inline u64
2439end_offset(u64 start, u64 len)
2440{
2441 u64 end;
2442
2443 end = start + len;
2444 return end >= start ? end: NFS4_MAX_UINT64;
2445}
2446
2447/* last octet in a range */
2448static inline u64
2449last_byte_offset(u64 start, u64 len)
2450{
2451 u64 end;
2452
2453 BUG_ON(!len);
2454 end = start + len;
2455 return end > start ? end - 1: NFS4_MAX_UINT64;
2456}
2457
1da177e4
LT		 2458#define lockownerid_hashval(id) \
2459 ((id) & LOCK_HASH_MASK)
2460
2461static inline unsigned int
2462lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2463 struct xdr_netobj *ownername)
2464{
2465 return (file_hashval(inode) + cl_id
2466 + opaque_hashval(ownername->data, ownername->len))
2467 & LOCK_HASH_MASK;
2468}
2469
2470static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2471static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2472static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2473
fd39ca9a 2474static struct nfs4_stateid *
1da177e4
LT		 2475find_stateid(stateid_t *stid, int flags)
2476{
9346eff0 2477 struct nfs4_stateid *local;
1da177e4
LT		 2478 u32 st_id = stid->si_stateownerid;
2479 u32 f_id = stid->si_fileid;
2480 unsigned int hashval;
2481
2482 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2483 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2484 hashval = stateid_hashval(st_id, f_id);
2485 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2486 if ((local->st_stateid.si_stateownerid == st_id) &&
2487 (local->st_stateid.si_fileid == f_id))
2488 return local;
2489 }
2490 }
9346eff0
KK		 2491
2492 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2493 hashval = stateid_hashval(st_id, f_id);
2494 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2495 if ((local->st_stateid.si_stateownerid == st_id) &&
2496 (local->st_stateid.si_fileid == f_id))
2497 return local;
2498 }
849823c5 2499 }
1da177e4
LT		 2500 return NULL;
2501}
2502
2503static struct nfs4_delegation *
2504find_delegation_stateid(struct inode *ino, stateid_t *stid)
2505{
13cd2184
N		 2506 struct nfs4_file *fp;
2507 struct nfs4_delegation *dl;
1da177e4
LT		 2508
2509 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2510 stid->si_boot, stid->si_stateownerid,
2511 stid->si_fileid, stid->si_generation);
2512
1da177e4 2513 fp = find_file(ino);
13cd2184
N		 2514 if (!fp)
2515 return NULL;
2516 dl = find_delegation_file(fp, stid);
2517 put_nfs4_file(fp);
2518 return dl;
1da177e4
LT		 2519}
2520
2521/*
2522 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2523 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2524 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2525 * locking, this prevents us from being completely protocol-compliant. The
2526 * real solution to this problem is to start using unsigned file offsets in
2527 * the VFS, but this is a very deep change!
2528 */
2529static inline void
2530nfs4_transform_lock_offset(struct file_lock *lock)
2531{
2532 if (lock->fl_start < 0)
2533 lock->fl_start = OFFSET_MAX;
2534 if (lock->fl_end < 0)
2535 lock->fl_end = OFFSET_MAX;
2536}
2537
d5b9026a
N		 2538/* Hack!: For now, we're defining this just so we can use a pointer to it
2539 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2540static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2541};
1da177e4
LT		 2542
2543static inline void
2544nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2545{
d5b9026a
N		 2546 struct nfs4_stateowner *sop;
2547 unsigned int hval;
1da177e4 2548
d5b9026a
N		 2549 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2550 sop = (struct nfs4_stateowner *) fl->fl_owner;
2551 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2552 kref_get(&sop->so_ref);
2553 deny->ld_sop = sop;
2554 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2555 } else {
2556 deny->ld_sop = NULL;
2557 deny->ld_clientid.cl_boot = 0;
2558 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2559 }
2560 deny->ld_start = fl->fl_start;
87df4de8
BH		 2561 deny->ld_length = NFS4_MAX_UINT64;
2562 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2563 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2564 deny->ld_type = NFS4_READ_LT;
2565 if (fl->fl_type != F_RDLCK)
2566 deny->ld_type = NFS4_WRITE_LT;
2567}
2568
1da177e4
LT		 2569static struct nfs4_stateowner *
2570find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2571 struct xdr_netobj *owner)
2572{
2573 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2574 struct nfs4_stateowner *op;
2575
2576 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2577 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2578 return op;
2579 }
2580 return NULL;
2581}
2582
2583/*
2584 * Alloc a lock owner structure.
2585 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2586 * occured.
2587 *
2588 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2589 */
2590
2591static struct nfs4_stateowner *
2592alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2593 struct nfs4_stateowner *sop;
2594 struct nfs4_replay *rp;
2595 unsigned int idhashval;
2596
2597 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2598 return NULL;
2599 idhashval = lockownerid_hashval(current_ownerid);
2600 INIT_LIST_HEAD(&sop->so_idhash);
2601 INIT_LIST_HEAD(&sop->so_strhash);
2602 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2603 INIT_LIST_HEAD(&sop->so_stateids);
2604 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2605 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2606 sop->so_time = 0;
2607 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2608 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2609 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2610 sop->so_is_open_owner = 0;
2611 sop->so_id = current_ownerid++;
2612 sop->so_client = clp;
b59e3c0e
NB		 2613 /* It is the openowner seqid that will be incremented in encode in the
2614 * case of new lockowners; so increment the lock seqid manually: */
2615 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2616 sop->so_confirmed = 1;
2617 rp = &sop->so_replay;
de1ae286 2618 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2619 rp->rp_buflen = 0;
2620 rp->rp_buf = rp->rp_ibuf;
2621 return sop;
2622}
2623
fd39ca9a 2624static struct nfs4_stateid *
1da177e4
LT		 2625alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2626{
2627 struct nfs4_stateid *stp;
2628 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2629
5ac049ac
N		 2630 stp = nfs4_alloc_stateid();
2631 if (stp == NULL)
1da177e4
LT		 2632 goto out;
2633 INIT_LIST_HEAD(&stp->st_hash);
2634 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2635 INIT_LIST_HEAD(&stp->st_perstateowner);
2636 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2637 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2638 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2639 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2640 stp->st_stateowner = sop;
13cd2184 2641 get_nfs4_file(fp);
1da177e4
LT		 2642 stp->st_file = fp;
2643 stp->st_stateid.si_boot = boot_time;
2644 stp->st_stateid.si_stateownerid = sop->so_id;
2645 stp->st_stateid.si_fileid = fp->fi_id;
2646 stp->st_stateid.si_generation = 0;
2647 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2648 stp->st_access_bmap = open_stp->st_access_bmap;
2649 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2650 stp->st_openstp = open_stp;
1da177e4
LT		 2651
2652out:
2653 return stp;
2654}
2655
fd39ca9a 2656static int
1da177e4
LT		 2657check_lock_length(u64 offset, u64 length)
2658{
87df4de8 2659 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2660 LOFF_OVERFLOW(offset, length)));
2661}
2662
2663/*
2664 * LOCK operation
2665 */
b37ad28b 2666__be32
ca364317 2667nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2668 struct nfsd4_lock *lock)
1da177e4 2669{
3e9e3dbe 2670 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2671 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2672 struct nfs4_stateid *lock_stp;
2673 struct file *filp;
2674 struct file_lock file_lock;
8dc7c311 2675 struct file_lock conflock;
b37ad28b 2676 __be32 status = 0;
1da177e4 2677 unsigned int strhashval;
150b3934 2678 unsigned int cmd;
b8dd7b9a 2679 int err;
1da177e4
LT		 2680
2681 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2682 (long long) lock->lk_offset,
2683 (long long) lock->lk_length);
2684
1da177e4
LT		 2685 if (check_lock_length(lock->lk_offset, lock->lk_length))
2686 return nfserr_inval;
2687
ca364317 2688 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2689 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2690 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2691 return status;
2692 }
2693
1da177e4
LT		 2694 nfs4_lock_state();
2695
2696 if (lock->lk_is_new) {
893f8770
N		 2697 /*
2698 * Client indicates that this is a new lockowner.
2699 * Use open owner and open stateid to create lock owner and
2700 * lock stateid.
2701 */
1da177e4
LT		 2702 struct nfs4_stateid *open_stp = NULL;
2703 struct nfs4_file *fp;
2704
2705 status = nfserr_stale_clientid;
849823c5 2706 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2707 goto out;
1da177e4 2708
1da177e4 2709 /* validate and update open stateid and open seqid */
ca364317 2710 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2711 lock->lk_new_open_seqid,
2712 &lock->lk_new_open_stateid,
f3362737 2713 OPEN_STATE,
3a65588a 2714 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2715 lock);
37515177 2716 if (status)
1da177e4 2717 goto out;
3a65588a 2718 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2719 /* create lockowner and lock stateid */
2720 fp = open_stp->st_file;
2721 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2722 open_sop->so_client->cl_clientid.cl_id,
2723 &lock->v.new.owner);
3e9e3dbe
N		 2724 /* XXX: Do we need to check for duplicate stateowners on
2725 * the same file, or should they just be allowed (and
2726 * create new stateids)? */
1da177e4 2727 status = nfserr_resource;
b59e3c0e
NB		 2728 lock_sop = alloc_init_lock_stateowner(strhashval,
2729 open_sop->so_client, open_stp, lock);
2730 if (lock_sop == NULL)
1da177e4 2731 goto out;
b59e3c0e 2732 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2733 if (lock_stp == NULL)
1da177e4 2734 goto out;
1da177e4
LT		 2735 } else {
2736 /* lock (lock owner + lock stateid) already exists */
ca364317 2737 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2738 lock->lk_old_lock_seqid,
2739 &lock->lk_old_lock_stateid,
f3362737 2740 LOCK_STATE,
3a65588a 2741 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2742 if (status)
2743 goto out;
3a65588a 2744 lock_sop = lock->lk_replay_owner;
1da177e4 2745 }
3a65588a 2746 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2747 filp = lock_stp->st_vfs_file;
2748
0dd395dc 2749 status = nfserr_grace;
af558e33 2750 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 2751 goto out;
2752 status = nfserr_no_grace;
af558e33 2753 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 2754 goto out;
2755
1da177e4
LT		 2756 locks_init_lock(&file_lock);
2757 switch (lock->lk_type) {
2758 case NFS4_READ_LT:
2759 case NFS4_READW_LT:
2760 file_lock.fl_type = F_RDLCK;
150b3934 2761 cmd = F_SETLK;
1da177e4
LT		 2762 break;
2763 case NFS4_WRITE_LT:
2764 case NFS4_WRITEW_LT:
2765 file_lock.fl_type = F_WRLCK;
150b3934 2766 cmd = F_SETLK;
1da177e4
LT		 2767 break;
2768 default:
2769 status = nfserr_inval;
2770 goto out;
2771 }
b59e3c0e 2772 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2773 file_lock.fl_pid = current->tgid;
2774 file_lock.fl_file = filp;
2775 file_lock.fl_flags = FL_POSIX;
d5b9026a 2776 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2777
2778 file_lock.fl_start = lock->lk_offset;
87df4de8 2779 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 2780 nfs4_transform_lock_offset(&file_lock);
2781
2782 /*
2783 * Try to lock the file in the VFS.
2784 * Note: locks.c uses the BKL to protect the inode's lock list.
2785 */
2786
fd85b817 2787 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2788 switch (-err) {
1da177e4
LT		 2789 case 0: /* success! */
2790 update_stateid(&lock_stp->st_stateid);
2791 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2792 sizeof(stateid_t));
b8dd7b9a 2793 status = 0;
eb76b3fd
AA		 2794 break;
2795 case (EAGAIN): /* conflock holds conflicting lock */
2796 status = nfserr_denied;
2797 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2798 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2799 break;
1da177e4
LT		 2800 case (EDEADLK):
2801 status = nfserr_deadlock;
eb76b3fd 2802 break;
1da177e4 2803 default:
fd85b817 2804 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2805 status = nfserr_resource;
2806 break;
1da177e4 2807 }
1da177e4 2808out:
8a280510 2809 if (status && lock->lk_is_new && lock_sop)
f044ff83 2810 release_lockowner(lock_sop);
3a65588a
BF		 2811 if (lock->lk_replay_owner) {
2812 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2813 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2814 }
1da177e4
LT		 2815 nfs4_unlock_state();
2816 return status;
2817}
2818
55ef1274
BF		 2819/*
2820 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2821 * so we do a temporary open here just to get an open file to pass to
2822 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2823 * inode operation.)
2824 */
2825static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2826{
2827 struct file *file;
2828 int err;
2829
2830 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2831 if (err)
2832 return err;
2833 err = vfs_test_lock(file, lock);
2834 nfsd_close(file);
2835 return err;
2836}
2837
1da177e4
LT		 2838/*
2839 * LOCKT operation
2840 */
b37ad28b 2841__be32
ca364317
BF		 2842nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2843 struct nfsd4_lockt *lockt)
1da177e4
LT		 2844{
2845 struct inode *inode;
1da177e4 2846 struct file_lock file_lock;
fd85b817 2847 int error;
b37ad28b 2848 __be32 status;
1da177e4 2849
af558e33 2850 if (locks_in_grace())
1da177e4
LT		 2851 return nfserr_grace;
2852
2853 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2854 return nfserr_inval;
2855
2856 lockt->lt_stateowner = NULL;
2857 nfs4_lock_state();
2858
2859 status = nfserr_stale_clientid;
849823c5 2860 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2861 goto out;
1da177e4 2862
ca364317 2863 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2864 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2865 if (status == nfserr_symlink)
2866 status = nfserr_inval;
2867 goto out;
2868 }
2869
ca364317 2870 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2871 locks_init_lock(&file_lock);
2872 switch (lockt->lt_type) {
2873 case NFS4_READ_LT:
2874 case NFS4_READW_LT:
2875 file_lock.fl_type = F_RDLCK;
2876 break;
2877 case NFS4_WRITE_LT:
2878 case NFS4_WRITEW_LT:
2879 file_lock.fl_type = F_WRLCK;
2880 break;
2881 default:
2fdada03 2882 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2883 status = nfserr_inval;
2884 goto out;
2885 }
2886
2887 lockt->lt_stateowner = find_lockstateowner_str(inode,
2888 &lockt->lt_clientid, &lockt->lt_owner);
2889 if (lockt->lt_stateowner)
2890 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2891 file_lock.fl_pid = current->tgid;
2892 file_lock.fl_flags = FL_POSIX;
2893
2894 file_lock.fl_start = lockt->lt_offset;
87df4de8 2895 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 2896
2897 nfs4_transform_lock_offset(&file_lock);
2898
1da177e4 2899 status = nfs_ok;
55ef1274 2900 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 2901 if (error) {
2902 status = nfserrno(error);
2903 goto out;
2904 }
9d6a8c5c 2905 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2906 status = nfserr_denied;
9d6a8c5c 2907 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2908 }
2909out:
2910 nfs4_unlock_state();
2911 return status;
2912}
2913
b37ad28b 2914__be32
ca364317 2915nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2916 struct nfsd4_locku *locku)
1da177e4
LT		 2917{
2918 struct nfs4_stateid *stp;
2919 struct file *filp = NULL;
2920 struct file_lock file_lock;
b37ad28b 2921 __be32 status;
b8dd7b9a 2922 int err;
1da177e4
LT		 2923
2924 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2925 (long long) locku->lu_offset,
2926 (long long) locku->lu_length);
2927
2928 if (check_lock_length(locku->lu_offset, locku->lu_length))
2929 return nfserr_inval;
2930
2931 nfs4_lock_state();
2932
ca364317 2933 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2934 locku->lu_seqid,
2935 &locku->lu_stateid,
f3362737 2936 LOCK_STATE,
1da177e4
LT		 2937 &locku->lu_stateowner, &stp, NULL)))
2938 goto out;
2939
2940 filp = stp->st_vfs_file;
2941 BUG_ON(!filp);
2942 locks_init_lock(&file_lock);
2943 file_lock.fl_type = F_UNLCK;
2944 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2945 file_lock.fl_pid = current->tgid;
2946 file_lock.fl_file = filp;
2947 file_lock.fl_flags = FL_POSIX;
d5b9026a 2948 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2949 file_lock.fl_start = locku->lu_offset;
2950
87df4de8 2951 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 2952 nfs4_transform_lock_offset(&file_lock);
2953
2954 /*
2955 * Try to unlock the file in the VFS.
2956 */
fd85b817 2957 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2958 if (err) {
fd85b817 2959 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2960 goto out_nfserr;
2961 }
2962 /*
2963 * OK, unlock succeeded; the only thing left to do is update the stateid.
2964 */
2965 update_stateid(&stp->st_stateid);
2966 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2967
2968out:
f2327d9a 2969 if (locku->lu_stateowner) {
1da177e4 2970 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2971 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2972 }
1da177e4
LT		 2973 nfs4_unlock_state();
2974 return status;
2975
2976out_nfserr:
b8dd7b9a 2977 status = nfserrno(err);
1da177e4
LT		 2978 goto out;
2979}
2980
2981/*
2982 * returns
2983 * 1: locks held by lockowner
2984 * 0: no locks held by lockowner
2985 */
2986static int
2987check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2988{
2989 struct file_lock **flpp;
7eaa36e2 2990 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2991 int status = 0;
2992
2993 lock_kernel();
2994 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2995 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2996 status = 1;
2997 goto out;
796dadfd 2998 }
1da177e4
LT		 2999 }
3000out:
3001 unlock_kernel();
3002 return status;
3003}
3004
b37ad28b 3005__be32
b591480b
BF		 3006nfsd4_release_lockowner(struct svc_rqst *rqstp,
3007 struct nfsd4_compound_state *cstate,
3008 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3009{
3010 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3011 struct nfs4_stateowner *sop;
3012 struct nfs4_stateid *stp;
1da177e4 3013 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3014 struct list_head matches;
3015 int i;
b37ad28b 3016 __be32 status;
1da177e4
LT		 3017
3018 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3019 clid->cl_boot, clid->cl_id);
3020
3021 /* XXX check for lease expiration */
3022
3023 status = nfserr_stale_clientid;
849823c5 3024 if (STALE_CLIENTID(clid))
1da177e4 3025 return status;
1da177e4
LT		 3026
3027 nfs4_lock_state();
3028
3e9e3dbe
N		 3029 status = nfserr_locks_held;
3030 /* XXX: we're doing a linear search through all the lockowners.
3031 * Yipes! For now we'll just hope clients aren't really using
3032 * release_lockowner much, but eventually we have to fix these
3033 * data structures. */
3034 INIT_LIST_HEAD(&matches);
3035 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3036 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3037 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3038 continue;
3039 list_for_each_entry(stp, &sop->so_stateids,
3040 st_perstateowner) {
3041 if (check_for_locks(stp->st_vfs_file, sop))
3042 goto out;
3043 /* Note: so_perclient unused for lockowners,
3044 * so it's OK to fool with here. */
3045 list_add(&sop->so_perclient, &matches);
3046 }
1da177e4 3047 }
3e9e3dbe
N		 3048 }
3049 /* Clients probably won't expect us to return with some (but not all)
3050 * of the lockowner state released; so don't release any until all
3051 * have been checked. */
3052 status = nfs_ok;
0fa822e4
N		 3053 while (!list_empty(&matches)) {
3054 sop = list_entry(matches.next, struct nfs4_stateowner,
3055 so_perclient);
3056 /* unhash_stateowner deletes so_perclient only
3057 * for openowners. */
3058 list_del(&sop->so_perclient);
f044ff83 3059 release_lockowner(sop);
1da177e4
LT		 3060 }
3061out:
3062 nfs4_unlock_state();
3063 return status;
3064}
3065
3066static inline struct nfs4_client_reclaim *
a55370a3 3067alloc_reclaim(void)
1da177e4 3068{
a55370a3 3069 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3070}
3071
c7b9a459
N		 3072int
3073nfs4_has_reclaimed_state(const char *name)
3074{
3075 unsigned int strhashval = clientstr_hashval(name);
3076 struct nfs4_client *clp;
3077
3078 clp = find_confirmed_client_by_str(name, strhashval);
3079 return clp ? 1 : 0;
3080}
3081
1da177e4
LT		 3082/*
3083 * failure => all reset bets are off, nfserr_no_grace...
3084 */
190e4fbf
N		 3085int
3086nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3087{
3088 unsigned int strhashval;
3089 struct nfs4_client_reclaim *crp = NULL;
3090
a55370a3
N		 3091 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3092 crp = alloc_reclaim();
1da177e4
LT		 3093 if (!crp)
3094 return 0;
a55370a3 3095 strhashval = clientstr_hashval(name);
1da177e4
LT		 3096 INIT_LIST_HEAD(&crp->cr_strhash);
3097 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3098 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3099 reclaim_str_hashtbl_size++;
3100 return 1;
3101}
3102
3103static void
3104nfs4_release_reclaim(void)
3105{
3106 struct nfs4_client_reclaim *crp = NULL;
3107 int i;
3108
1da177e4
LT		 3109 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3110 while (!list_empty(&reclaim_str_hashtbl[i])) {
3111 crp = list_entry(reclaim_str_hashtbl[i].next,
3112 struct nfs4_client_reclaim, cr_strhash);
3113 list_del(&crp->cr_strhash);
1da177e4
LT		 3114 kfree(crp);
3115 reclaim_str_hashtbl_size--;
3116 }
3117 }
3118 BUG_ON(reclaim_str_hashtbl_size);
3119}
3120
3121/*
3122 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3123static struct nfs4_client_reclaim *
1da177e4
LT		 3124nfs4_find_reclaim_client(clientid_t *clid)
3125{
3126 unsigned int strhashval;
3127 struct nfs4_client *clp;
3128 struct nfs4_client_reclaim *crp = NULL;
3129
3130
3131 /* find clientid in conf_id_hashtbl */
3132 clp = find_confirmed_client(clid);
3133 if (clp == NULL)
3134 return NULL;
3135
a55370a3
N		 3136 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3137 clp->cl_name.len, clp->cl_name.data,
3138 clp->cl_recdir);
1da177e4
LT		 3139
3140 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3141 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3142 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3143 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3144 return crp;
3145 }
3146 }
3147 return NULL;
3148}
3149
3150/*
3151* Called from OPEN. Look for clientid in reclaim list.
3152*/
b37ad28b 3153__be32
1da177e4
LT		 3154nfs4_check_open_reclaim(clientid_t *clid)
3155{
dfc83565 3156 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3157}
3158
ac4d8ff2 3159/* initialization to perform at module load time: */
1da177e4 3160
e8ff2a84 3161int
ac4d8ff2 3162nfs4_state_init(void)
1da177e4 3163{
e8ff2a84 3164 int i, status;
1da177e4 3165
e8ff2a84
BF		 3166 status = nfsd4_init_slabs();
3167 if (status)
3168 return status;
1da177e4
LT		 3169 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3170 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3171 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3172 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3173 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3174 }
3175 for (i = 0; i < FILE_HASH_SIZE; i++) {
3176 INIT_LIST_HEAD(&file_hashtbl[i]);
3177 }
3178 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3179 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3180 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3181 }
3182 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3183 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3184 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3185 }
3186 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3187 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3188 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3189 }
1da177e4 3190 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3191 INIT_LIST_HEAD(&close_lru);
3192 INIT_LIST_HEAD(&client_lru);
3193 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3194 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3195 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3196 reclaim_str_hashtbl_size = 0;
e8ff2a84 3197 return 0;
ac4d8ff2
N		 3198}
3199
190e4fbf
N		 3200static void
3201nfsd4_load_reboot_recovery_data(void)
3202{
3203 int status;
3204
0964a3d3
N		 3205 nfs4_lock_state();
3206 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3207 status = nfsd4_recdir_load();
0964a3d3 3208 nfs4_unlock_state();
190e4fbf
N		 3209 if (status)
3210 printk("NFSD: Failure reading reboot recovery data\n");
3211}
3212
9a8db97e
ME		 3213unsigned long
3214get_nfs4_grace_period(void)
3215{
3216 return max(user_lease_time, lease_time) * HZ;
3217}
3218
c2f1a551
MS		 3219/*
3220 * Since the lifetime of a delegation isn't limited to that of an open, a
3221 * client may quite reasonably hang on to a delegation as long as it has
3222 * the inode cached. This becomes an obvious problem the first time a
3223 * client's inode cache approaches the size of the server's total memory.
3224 *
3225 * For now we avoid this problem by imposing a hard limit on the number
3226 * of delegations, which varies according to the server's memory size.
3227 */
3228static void
3229set_max_delegations(void)
3230{
3231 /*
3232 * Allow at most 4 delegations per megabyte of RAM. Quick
3233 * estimates suggest that in the worst case (where every delegation
3234 * is for a different inode), a delegation could take about 1.5K,
3235 * giving a worst case usage of about 6% of memory.
3236 */
3237 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3238}
3239
ac4d8ff2
N		 3240/* initialization to perform when the nfsd service is started: */
3241
3242static void
3243__nfs4_state_start(void)
3244{
9a8db97e 3245 unsigned long grace_time;
ac4d8ff2 3246
1da177e4 3247 boot_time = get_seconds();
af558e33 3248 grace_time = get_nfs4_grace_period();
d99a05ad 3249 lease_time = user_lease_time;
af558e33 3250 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3251 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3252 grace_time/HZ);
58da282b 3253 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3254 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3255 set_max_delegations();
1da177e4
LT		 3256}
3257
e8ff2a84 3258void
76a3550e 3259nfs4_state_start(void)
1da177e4 3260{
1da177e4 3261 if (nfs4_init)
e8ff2a84 3262 return;
190e4fbf 3263 nfsd4_load_reboot_recovery_data();
76a3550e 3264 __nfs4_state_start();
1da177e4 3265 nfs4_init = 1;
e8ff2a84 3266 return;
1da177e4
LT		 3267}
3268
1da177e4
LT		 3269time_t
3270nfs4_lease_time(void)
3271{
3272 return lease_time;
3273}
3274
3275static void
3276__nfs4_state_shutdown(void)
3277{
3278 int i;
3279 struct nfs4_client *clp = NULL;
3280 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3281 struct list_head *pos, *next, reaplist;
3282
1da177e4
LT		 3283 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3284 while (!list_empty(&conf_id_hashtbl[i])) {
3285 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3286 expire_client(clp);
3287 }
3288 while (!list_empty(&unconf_str_hashtbl[i])) {
3289 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3290 expire_client(clp);
3291 }
3292 }
3293 INIT_LIST_HEAD(&reaplist);
3294 spin_lock(&recall_lock);
3295 list_for_each_safe(pos, next, &del_recall_lru) {
3296 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3297 list_move(&dp->dl_recall_lru, &reaplist);
3298 }
3299 spin_unlock(&recall_lock);
3300 list_for_each_safe(pos, next, &reaplist) {
3301 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3302 list_del_init(&dp->dl_recall_lru);
3303 unhash_delegation(dp);
3304 }
3305
190e4fbf 3306 nfsd4_shutdown_recdir();
1da177e4 3307 nfs4_init = 0;
1da177e4
LT		 3308}
3309
3310void
3311nfs4_state_shutdown(void)
3312{
5e8d5c29
N		 3313 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3314 destroy_workqueue(laundry_wq);
2c5e7615 3315 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3316 nfs4_lock_state();
3317 nfs4_release_reclaim();
3318 __nfs4_state_shutdown();
1da177e4
LT		 3319 nfs4_unlock_state();
3320}
3321
3dd98a3b
JL		 3322/*
3323 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3324 * accessed when nfsd is starting.
3325 */
0964a3d3
N		 3326static void
3327nfs4_set_recdir(char *recdir)
3328{
0964a3d3 3329 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3330}
3331
3332/*
3333 * Change the NFSv4 recovery directory to recdir.
3334 */
3335int
3336nfs4_reset_recoverydir(char *recdir)
3337{
3338 int status;
a63bb996 3339 struct path path;
0964a3d3 3340
a63bb996 3341 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3342 if (status)
3343 return status;
3344 status = -ENOTDIR;
a63bb996 3345 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3346 nfs4_set_recdir(recdir);
3347 status = 0;
3348 }
a63bb996 3349 path_put(&path);
0964a3d3
N		 3350 return status;
3351}
3352
3dd98a3b
JL		 3353char *
3354nfs4_recoverydir(void)
3355{
3356 return user_recovery_dirname;
3357}
3358
1da177e4
LT		 3359/*
3360 * Called when leasetime is changed.
3361 *
d99a05ad
N		 3362 * The only way the protocol gives us to handle on-the-fly lease changes is to
3363 * simulate a reboot. Instead of doing that, we just wait till the next time
3364 * we start to register any changes in lease time. If the administrator
3365 * really wants to change the lease time *now*, they can go ahead and bring
3366 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3367 *
3368 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3369 * when nfsd is starting
1da177e4
LT		 3370 */
3371void
3372nfs4_reset_lease(time_t leasetime)
3373{
d99a05ad 3374 user_lease_time = leasetime;
1da177e4 3375}
Linux 6.x block layer and io_uring tree(s)