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nfsd4: simplify stateid sequencing checks
[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>
1da177e4
LT		 57
58#define NFSDDBG_FACILITY NFSDDBG_PROC
59
60/* Globals */
61static time_t lease_time = 90; /* default lease time */
d99a05ad 62static time_t user_lease_time = 90;
fd39ca9a 63static time_t boot_time;
a76b4319 64static int in_grace = 1;
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
LT		 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
78static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 79static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 81
82/* Locking:
83 *
353ab6e9 84 * client_mutex:
1da177e4
LT		 85 * protects clientid_hashtbl[], clientstr_hashtbl[],
86 * unconfstr_hashtbl[], uncofid_hashtbl[].
87 */
353ab6e9 88static DEFINE_MUTEX(client_mutex);
1da177e4 89
e18b890b
CL		 90static struct kmem_cache *stateowner_slab = NULL;
91static struct kmem_cache *file_slab = NULL;
92static struct kmem_cache *stateid_slab = NULL;
93static struct kmem_cache *deleg_slab = NULL;
e60d4398 94
1da177e4
LT		 95void
96nfs4_lock_state(void)
97{
353ab6e9 98 mutex_lock(&client_mutex);
1da177e4
LT		 99}
100
101void
102nfs4_unlock_state(void)
103{
353ab6e9 104 mutex_unlock(&client_mutex);
1da177e4
LT		 105}
106
107static inline u32
108opaque_hashval(const void *ptr, int nbytes)
109{
110 unsigned char *cptr = (unsigned char *) ptr;
111
112 u32 x = 0;
113 while (nbytes--) {
114 x *= 37;
115 x += *cptr++;
116 }
117 return x;
118}
119
120/* forward declarations */
121static void release_stateowner(struct nfs4_stateowner *sop);
122static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 123
124/*
125 * Delegation state
126 */
127
128/* recall_lock protects the del_recall_lru */
34af946a 129static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 130static struct list_head del_recall_lru;
131
13cd2184
N		 132static void
133free_nfs4_file(struct kref *kref)
134{
135 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
136 list_del(&fp->fi_hash);
137 iput(fp->fi_inode);
138 kmem_cache_free(file_slab, fp);
139}
140
141static inline void
142put_nfs4_file(struct nfs4_file *fi)
143{
144 kref_put(&fi->fi_ref, free_nfs4_file);
145}
146
147static inline void
148get_nfs4_file(struct nfs4_file *fi)
149{
150 kref_get(&fi->fi_ref);
151}
152
ef0f3390 153static int num_delegations;
c2f1a551 154unsigned int max_delegations;
ef0f3390
N		 155
156/*
157 * Open owner state (share locks)
158 */
159
160/* hash tables for nfs4_stateowner */
161#define OWNER_HASH_BITS 8
162#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
163#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
164
165#define ownerid_hashval(id) \
166 ((id) & OWNER_HASH_MASK)
167#define ownerstr_hashval(clientid, ownername) \
168 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
169
170static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
171static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
172
173/* hash table for nfs4_file */
174#define FILE_HASH_BITS 8
175#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
176#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
177/* hash table for (open)nfs4_stateid */
178#define STATEID_HASH_BITS 10
179#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
180#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
181
182#define file_hashval(x) \
183 hash_ptr(x, FILE_HASH_BITS)
184#define stateid_hashval(owner_id, file_id) \
185 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
186
187static struct list_head file_hashtbl[FILE_HASH_SIZE];
188static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
189
1da177e4
LT		 190static struct nfs4_delegation *
191alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
192{
193 struct nfs4_delegation *dp;
194 struct nfs4_file *fp = stp->st_file;
195 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
196
197 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 198 if (fp->fi_had_conflict)
199 return NULL;
c2f1a551 200 if (num_delegations > max_delegations)
ef0f3390 201 return NULL;
5b2d21c1
N		 202 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
203 if (dp == NULL)
1da177e4 204 return dp;
ef0f3390 205 num_delegations++;
ea1da636
N		 206 INIT_LIST_HEAD(&dp->dl_perfile);
207 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 208 INIT_LIST_HEAD(&dp->dl_recall_lru);
209 dp->dl_client = clp;
13cd2184 210 get_nfs4_file(fp);
1da177e4
LT		 211 dp->dl_file = fp;
212 dp->dl_flock = NULL;
213 get_file(stp->st_vfs_file);
214 dp->dl_vfs_file = stp->st_vfs_file;
215 dp->dl_type = type;
216 dp->dl_recall.cbr_dp = NULL;
217 dp->dl_recall.cbr_ident = cb->cb_ident;
218 dp->dl_recall.cbr_trunc = 0;
219 dp->dl_stateid.si_boot = boot_time;
220 dp->dl_stateid.si_stateownerid = current_delegid++;
221 dp->dl_stateid.si_fileid = 0;
222 dp->dl_stateid.si_generation = 0;
223 dp->dl_fhlen = current_fh->fh_handle.fh_size;
224 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
225 current_fh->fh_handle.fh_size);
226 dp->dl_time = 0;
227 atomic_set(&dp->dl_count, 1);
ea1da636
N		 228 list_add(&dp->dl_perfile, &fp->fi_delegations);
229 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 230 return dp;
231}
232
233void
234nfs4_put_delegation(struct nfs4_delegation *dp)
235{
236 if (atomic_dec_and_test(&dp->dl_count)) {
237 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 238 put_nfs4_file(dp->dl_file);
5b2d21c1 239 kmem_cache_free(deleg_slab, dp);
ef0f3390 240 num_delegations--;
1da177e4
LT		 241 }
242}
243
244/* Remove the associated file_lock first, then remove the delegation.
245 * lease_modify() is called to remove the FS_LEASE file_lock from
246 * the i_flock list, eventually calling nfsd's lock_manager
247 * fl_release_callback.
248 */
249static void
250nfs4_close_delegation(struct nfs4_delegation *dp)
251{
252 struct file *filp = dp->dl_vfs_file;
253
254 dprintk("NFSD: close_delegation dp %p\n",dp);
255 dp->dl_vfs_file = NULL;
256 /* The following nfsd_close may not actually close the file,
257 * but we want to remove the lease in any case. */
c907132d 258 if (dp->dl_flock)
a9933cea 259 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 260 nfsd_close(filp);
1da177e4
LT		 261}
262
263/* Called under the state lock. */
264static void
265unhash_delegation(struct nfs4_delegation *dp)
266{
ea1da636
N		 267 list_del_init(&dp->dl_perfile);
268 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 269 spin_lock(&recall_lock);
270 list_del_init(&dp->dl_recall_lru);
271 spin_unlock(&recall_lock);
272 nfs4_close_delegation(dp);
273 nfs4_put_delegation(dp);
274}
275
276/*
277 * SETCLIENTID state
278 */
279
280/* Hash tables for nfs4_clientid state */
281#define CLIENT_HASH_BITS 4
282#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
283#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
284
285#define clientid_hashval(id) \
286 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 287#define clientstr_hashval(name) \
288 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 289/*
290 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
291 * used in reboot/reset lease grace period processing
292 *
293 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
294 * setclientid_confirmed info.
295 *
296 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
297 * setclientid info.
298 *
299 * client_lru holds client queue ordered by nfs4_client.cl_time
300 * for lease renewal.
301 *
302 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
303 * for last close replay.
304 */
305static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
306static int reclaim_str_hashtbl_size = 0;
307static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
311static struct list_head client_lru;
312static struct list_head close_lru;
313
314static inline void
315renew_client(struct nfs4_client *clp)
316{
317 /*
318 * Move client to the end to the LRU list.
319 */
320 dprintk("renewing client (clientid %08x/%08x)\n",
321 clp->cl_clientid.cl_boot,
322 clp->cl_clientid.cl_id);
323 list_move_tail(&clp->cl_lru, &client_lru);
324 clp->cl_time = get_seconds();
325}
326
327/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
328static int
329STALE_CLIENTID(clientid_t *clid)
330{
331 if (clid->cl_boot == boot_time)
332 return 0;
333 dprintk("NFSD stale clientid (%08x/%08x)\n",
334 clid->cl_boot, clid->cl_id);
335 return 1;
336}
337
338/*
339 * XXX Should we use a slab cache ?
340 * This type of memory management is somewhat inefficient, but we use it
341 * anyway since SETCLIENTID is not a common operation.
342 */
35bba9a3 343static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 344{
345 struct nfs4_client *clp;
346
35bba9a3
BF		 347 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
348 if (clp == NULL)
349 return NULL;
350 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
351 if (clp->cl_name.data == NULL) {
352 kfree(clp);
353 return NULL;
1da177e4 354 }
35bba9a3
BF		 355 memcpy(clp->cl_name.data, name.data, name.len);
356 clp->cl_name.len = name.len;
1da177e4
LT		 357 return clp;
358}
359
1b1a9b31
BF		 360static void
361shutdown_callback_client(struct nfs4_client *clp)
362{
363 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
364
1b1a9b31 365 if (clnt) {
404ec117
BF		 366 /*
367 * Callback threads take a reference on the client, so there
368 * should be no outstanding callbacks at this point.
369 */
1b1a9b31
BF		 370 clp->cl_callback.cb_client = NULL;
371 rpc_shutdown_client(clnt);
372 }
373}
374
1da177e4
LT		 375static inline void
376free_client(struct nfs4_client *clp)
377{
1b1a9b31 378 shutdown_callback_client(clp);
1da177e4
LT		 379 if (clp->cl_cred.cr_group_info)
380 put_group_info(clp->cl_cred.cr_group_info);
381 kfree(clp->cl_name.data);
382 kfree(clp);
383}
384
385void
386put_nfs4_client(struct nfs4_client *clp)
387{
388 if (atomic_dec_and_test(&clp->cl_count))
389 free_client(clp);
390}
391
392static void
393expire_client(struct nfs4_client *clp)
394{
395 struct nfs4_stateowner *sop;
396 struct nfs4_delegation *dp;
1da177e4
LT		 397 struct list_head reaplist;
398
399 dprintk("NFSD: expire_client cl_count %d\n",
400 atomic_read(&clp->cl_count));
401
1da177e4
LT		 402 INIT_LIST_HEAD(&reaplist);
403 spin_lock(&recall_lock);
ea1da636
N		 404 while (!list_empty(&clp->cl_delegations)) {
405 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 406 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
407 dp->dl_flock);
ea1da636 408 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 409 list_move(&dp->dl_recall_lru, &reaplist);
410 }
411 spin_unlock(&recall_lock);
412 while (!list_empty(&reaplist)) {
413 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
414 list_del_init(&dp->dl_recall_lru);
415 unhash_delegation(dp);
416 }
417 list_del(&clp->cl_idhash);
418 list_del(&clp->cl_strhash);
419 list_del(&clp->cl_lru);
ea1da636
N		 420 while (!list_empty(&clp->cl_openowners)) {
421 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 422 release_stateowner(sop);
423 }
424 put_nfs4_client(clp);
425}
426
35bba9a3
BF		 427static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
428{
1da177e4
LT		 429 struct nfs4_client *clp;
430
35bba9a3
BF		 431 clp = alloc_client(name);
432 if (clp == NULL)
433 return NULL;
a55370a3 434 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 435 atomic_set(&clp->cl_count, 1);
436 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 437 INIT_LIST_HEAD(&clp->cl_idhash);
438 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 439 INIT_LIST_HEAD(&clp->cl_openowners);
440 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 441 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 442 return clp;
443}
444
35bba9a3
BF		 445static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
446{
447 memcpy(target->cl_verifier.data, source->data,
448 sizeof(target->cl_verifier.data));
1da177e4
LT		 449}
450
35bba9a3
BF		 451static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
452{
1da177e4
LT		 453 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
454 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
455}
456
35bba9a3
BF		 457static void copy_cred(struct svc_cred *target, struct svc_cred *source)
458{
1da177e4
LT		 459 target->cr_uid = source->cr_uid;
460 target->cr_gid = source->cr_gid;
461 target->cr_group_info = source->cr_group_info;
462 get_group_info(target->cr_group_info);
463}
464
35bba9a3 465static int same_name(const char *n1, const char *n2)
599e0a22 466{
a55370a3 467 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 468}
469
470static int
599e0a22
BF		 471same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
472{
473 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 474}
475
476static int
599e0a22
BF		 477same_clid(clientid_t *cl1, clientid_t *cl2)
478{
479 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 480}
481
482/* XXX what about NGROUP */
483static int
599e0a22
BF		 484same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
485{
486 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 487}
488
5ec7b46c
BF		 489static void gen_clid(struct nfs4_client *clp)
490{
491 static u32 current_clientid = 1;
492
1da177e4
LT		 493 clp->cl_clientid.cl_boot = boot_time;
494 clp->cl_clientid.cl_id = current_clientid++;
495}
496
deda2faa
BF		 497static void gen_confirm(struct nfs4_client *clp)
498{
499 static u32 i;
500 u32 *p;
1da177e4 501
1da177e4 502 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 503 *p++ = get_seconds();
504 *p++ = i++;
1da177e4
LT		 505}
506
35bba9a3
BF		 507static int check_name(struct xdr_netobj name)
508{
1da177e4
LT		 509 if (name.len == 0)
510 return 0;
511 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 512 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 513 return 0;
514 }
515 return 1;
516}
517
fd39ca9a 518static void
1da177e4
LT		 519add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
520{
521 unsigned int idhashval;
522
523 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
524 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
525 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
526 list_add_tail(&clp->cl_lru, &client_lru);
527 clp->cl_time = get_seconds();
528}
529
fd39ca9a 530static void
1da177e4
LT		 531move_to_confirmed(struct nfs4_client *clp)
532{
533 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
534 unsigned int strhashval;
535
536 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
537 list_del_init(&clp->cl_strhash);
f116629d 538 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 539 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 540 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
541 renew_client(clp);
542}
543
544static struct nfs4_client *
545find_confirmed_client(clientid_t *clid)
546{
547 struct nfs4_client *clp;
548 unsigned int idhashval = clientid_hashval(clid->cl_id);
549
550 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 551 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 552 return clp;
553 }
554 return NULL;
555}
556
557static struct nfs4_client *
558find_unconfirmed_client(clientid_t *clid)
559{
560 struct nfs4_client *clp;
561 unsigned int idhashval = clientid_hashval(clid->cl_id);
562
563 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 564 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 565 return clp;
566 }
567 return NULL;
568}
569
28ce6054
N		 570static struct nfs4_client *
571find_confirmed_client_by_str(const char *dname, unsigned int hashval)
572{
573 struct nfs4_client *clp;
574
575 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
576 if (same_name(clp->cl_recdir, dname))
577 return clp;
578 }
579 return NULL;
580}
581
582static struct nfs4_client *
583find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
584{
585 struct nfs4_client *clp;
586
587 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
588 if (same_name(clp->cl_recdir, dname))
589 return clp;
590 }
591 return NULL;
592}
593
1da177e4
LT		 594/* a helper function for parse_callback */
595static int
596parse_octet(unsigned int *lenp, char **addrp)
597{
598 unsigned int len = *lenp;
599 char *p = *addrp;
600 int n = -1;
601 char c;
602
603 for (;;) {
604 if (!len)
605 break;
606 len--;
607 c = *p++;
608 if (c == '.')
609 break;
610 if ((c < '0') || (c > '9')) {
611 n = -1;
612 break;
613 }
614 if (n < 0)
615 n = 0;
616 n = (n * 10) + (c - '0');
617 if (n > 255) {
618 n = -1;
619 break;
620 }
621 }
622 *lenp = len;
623 *addrp = p;
624 return n;
625}
626
627/* parse and set the setclientid ipv4 callback address */
fd39ca9a 628static int
1da177e4
LT		 629parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
630{
631 int temp = 0;
632 u32 cbaddr = 0;
633 u16 cbport = 0;
634 u32 addrlen = addr_len;
635 char *addr = addr_val;
636 int i, shift;
637
638 /* ipaddress */
639 shift = 24;
640 for(i = 4; i > 0 ; i--) {
641 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
642 return 0;
643 }
644 cbaddr |= (temp << shift);
645 if (shift > 0)
646 shift -= 8;
647 }
648 *cbaddrp = cbaddr;
649
650 /* port */
651 shift = 8;
652 for(i = 2; i > 0 ; i--) {
653 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
654 return 0;
655 }
656 cbport |= (temp << shift);
657 if (shift > 0)
658 shift -= 8;
659 }
660 *cbportp = cbport;
661 return 1;
662}
663
fd39ca9a 664static void
1da177e4
LT		 665gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
666{
667 struct nfs4_callback *cb = &clp->cl_callback;
668
669 /* Currently, we only support tcp for the callback channel */
670 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
671 goto out_err;
672
673 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
674 &cb->cb_addr, &cb->cb_port)))
675 goto out_err;
676 cb->cb_prog = se->se_callback_prog;
677 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 678 return;
679out_err:
849823c5 680 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 681 "will not receive delegations\n",
682 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
683
1da177e4
LT		 684 return;
685}
686
b37ad28b 687__be32
b591480b
BF		 688nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
689 struct nfsd4_setclientid *setclid)
1da177e4 690{
27459f09 691 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 692 struct xdr_netobj clname = {
693 .len = setclid->se_namelen,
694 .data = setclid->se_name,
695 };
696 nfs4_verifier clverifier = setclid->se_verf;
697 unsigned int strhashval;
28ce6054 698 struct nfs4_client *conf, *unconf, *new;
b37ad28b 699 __be32 status;
a55370a3 700 char dname[HEXDIR_LEN];
1da177e4 701
1da177e4 702 if (!check_name(clname))
73aea4ec 703 return nfserr_inval;
1da177e4 704
a55370a3
N		 705 status = nfs4_make_rec_clidname(dname, &clname);
706 if (status)
73aea4ec 707 return status;
a55370a3 708
1da177e4
LT		 709 /*
710 * XXX The Duplicate Request Cache (DRC) has been checked (??)
711 * We get here on a DRC miss.
712 */
713
a55370a3 714 strhashval = clientstr_hashval(dname);
1da177e4 715
1da177e4 716 nfs4_lock_state();
28ce6054
N		 717 conf = find_confirmed_client_by_str(dname, strhashval);
718 if (conf) {
a186e767 719 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 720 status = nfserr_clid_inuse;
599e0a22 721 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 722 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 723 dprintk("NFSD: setclientid: string in use by client"
724 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 725 goto out;
726 }
1da177e4 727 }
a186e767
BF		 728 /*
729 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
730 * has a description of SETCLIENTID request processing consisting
731 * of 5 bullet points, labeled as CASE0 - CASE4 below.
732 */
28ce6054 733 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 734 status = nfserr_resource;
735 if (!conf) {
a186e767
BF		 736 /*
737 * RFC 3530 14.2.33 CASE 4:
738 * placed first, because it is the normal case
1da177e4
LT		 739 */
740 if (unconf)
741 expire_client(unconf);
a55370a3
N		 742 new = create_client(clname, dname);
743 if (new == NULL)
1da177e4 744 goto out;
1da177e4 745 gen_clid(new);
599e0a22 746 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 747 /*
a186e767
BF		 748 * RFC 3530 14.2.33 CASE 1:
749 * probable callback update
1da177e4 750 */
31f4a6c1
N		 751 if (unconf) {
752 /* Note this is removing unconfirmed {*x***},
753 * which is stronger than RFC recommended {vxc**}.
754 * This has the advantage that there is at most
755 * one {*x***} in either list at any time.
756 */
757 expire_client(unconf);
1da177e4 758 }
a55370a3
N		 759 new = create_client(clname, dname);
760 if (new == NULL)
1da177e4 761 goto out;
1da177e4 762 copy_clid(new, conf);
1da177e4
LT		 763 } else if (!unconf) {
764 /*
a186e767
BF		 765 * RFC 3530 14.2.33 CASE 2:
766 * probable client reboot; state will be removed if
767 * confirmed.
1da177e4 768 */
a55370a3
N		 769 new = create_client(clname, dname);
770 if (new == NULL)
1da177e4 771 goto out;
1da177e4 772 gen_clid(new);
49ba8781 773 } else {
a186e767
BF		 774 /*
775 * RFC 3530 14.2.33 CASE 3:
776 * probable client reboot; state will be removed if
777 * confirmed.
1da177e4
LT		 778 */
779 expire_client(unconf);
a55370a3
N		 780 new = create_client(clname, dname);
781 if (new == NULL)
1da177e4 782 goto out;
1da177e4 783 gen_clid(new);
1da177e4 784 }
c175b83c
BF		 785 copy_verf(new, &clverifier);
786 new->cl_addr = sin->sin_addr.s_addr;
787 copy_cred(&new->cl_cred, &rqstp->rq_cred);
788 gen_confirm(new);
789 gen_callback(new, setclid);
790 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 791 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
792 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
793 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
794 status = nfs_ok;
795out:
796 nfs4_unlock_state();
797 return status;
798}
799
800
801/*
a186e767
BF		 802 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
803 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
804 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 805 */
b37ad28b 806__be32
b591480b
BF		 807nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
808 struct nfsd4_compound_state *cstate,
809 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 810{
27459f09 811 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 812 struct nfs4_client *conf, *unconf;
1da177e4
LT		 813 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
814 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 815 __be32 status;
1da177e4
LT		 816
817 if (STALE_CLIENTID(clid))
818 return nfserr_stale_clientid;
819 /*
820 * XXX The Duplicate Request Cache (DRC) has been checked (??)
821 * We get here on a DRC miss.
822 */
823
824 nfs4_lock_state();
21ab45a4
N		 825
826 conf = find_confirmed_client(clid);
827 unconf = find_unconfirmed_client(clid);
828
829 status = nfserr_clid_inuse;
27459f09 830 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 831 goto out;
27459f09 832 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 833 goto out;
834
a186e767
BF		 835 /*
836 * section 14.2.34 of RFC 3530 has a description of
837 * SETCLIENTID_CONFIRM request processing consisting
838 * of 4 bullet points, labeled as CASE1 - CASE4 below.
839 */
366e0c1d 840 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 841 /*
842 * RFC 3530 14.2.34 CASE 1:
843 * callback update
844 */
599e0a22 845 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 846 status = nfserr_clid_inuse;
847 else {
1a69c179
N		 848 /* XXX: We just turn off callbacks until we can handle
849 * change request correctly. */
cb36d634 850 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 851 gen_confirm(conf);
46309029 852 nfsd4_remove_clid_dir(unconf);
1a69c179 853 expire_client(unconf);
1da177e4 854 status = nfs_ok;
1a69c179 855
1da177e4 856 }
f3aba4e5 857 } else if (conf && !unconf) {
a186e767
BF		 858 /*
859 * RFC 3530 14.2.34 CASE 2:
860 * probable retransmitted request; play it safe and
861 * do nothing.
7c79f737 862 */
599e0a22 863 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 864 status = nfserr_clid_inuse;
21ab45a4 865 else
1da177e4 866 status = nfs_ok;
7c79f737 867 } else if (!conf && unconf
599e0a22 868 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 869 /*
870 * RFC 3530 14.2.34 CASE 3:
871 * Normal case; new or rebooted client:
7c79f737 872 */
599e0a22 873 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 874 status = nfserr_clid_inuse;
875 } else {
1a69c179
N		 876 unsigned int hash =
877 clientstr_hashval(unconf->cl_recdir);
878 conf = find_confirmed_client_by_str(unconf->cl_recdir,
879 hash);
880 if (conf) {
c7b9a459 881 nfsd4_remove_clid_dir(conf);
1a69c179
N		 882 expire_client(conf);
883 }
1da177e4 884 move_to_confirmed(unconf);
21ab45a4 885 conf = unconf;
46f8a64b 886 nfsd4_probe_callback(conf);
1a69c179 887 status = nfs_ok;
1da177e4 888 }
599e0a22
BF		 889 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
890 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 891 &confirm)))) {
a186e767
BF		 892 /*
893 * RFC 3530 14.2.34 CASE 4:
894 * Client probably hasn't noticed that we rebooted yet.
7c79f737 895 */
1da177e4 896 status = nfserr_stale_clientid;
7c79f737 897 } else {
08e8987c
N		 898 /* check that we have hit one of the cases...*/
899 status = nfserr_clid_inuse;
900 }
1da177e4 901out:
1da177e4
LT		 902 nfs4_unlock_state();
903 return status;
904}
905
1da177e4
LT		 906/* OPEN Share state helper functions */
907static inline struct nfs4_file *
908alloc_init_file(struct inode *ino)
909{
910 struct nfs4_file *fp;
911 unsigned int hashval = file_hashval(ino);
912
e60d4398
N		 913 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
914 if (fp) {
13cd2184 915 kref_init(&fp->fi_ref);
1da177e4 916 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 917 INIT_LIST_HEAD(&fp->fi_stateids);
918 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 919 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
920 fp->fi_inode = igrab(ino);
921 fp->fi_id = current_fileid++;
47f9940c 922 fp->fi_had_conflict = false;
1da177e4
LT		 923 return fp;
924 }
925 return NULL;
926}
927
e60d4398 928static void
e18b890b 929nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 930{
e60d4398
N		 931 if (*slab == NULL)
932 return;
1a1d92c1 933 kmem_cache_destroy(*slab);
e60d4398 934 *slab = NULL;
1da177e4
LT		 935}
936
e8ff2a84 937void
1da177e4
LT		 938nfsd4_free_slabs(void)
939{
e60d4398
N		 940 nfsd4_free_slab(&stateowner_slab);
941 nfsd4_free_slab(&file_slab);
5ac049ac 942 nfsd4_free_slab(&stateid_slab);
5b2d21c1 943 nfsd4_free_slab(&deleg_slab);
e60d4398 944}
1da177e4 945
e60d4398
N		 946static int
947nfsd4_init_slabs(void)
948{
949 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 950 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 951 if (stateowner_slab == NULL)
952 goto out_nomem;
953 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 954 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 955 if (file_slab == NULL)
956 goto out_nomem;
5ac049ac 957 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 958 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 959 if (stateid_slab == NULL)
960 goto out_nomem;
5b2d21c1 961 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 962 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 963 if (deleg_slab == NULL)
964 goto out_nomem;
e60d4398
N		 965 return 0;
966out_nomem:
967 nfsd4_free_slabs();
968 dprintk("nfsd4: out of memory while initializing nfsv4\n");
969 return -ENOMEM;
1da177e4
LT		 970}
971
972void
973nfs4_free_stateowner(struct kref *kref)
974{
975 struct nfs4_stateowner *sop =
976 container_of(kref, struct nfs4_stateowner, so_ref);
977 kfree(sop->so_owner.data);
978 kmem_cache_free(stateowner_slab, sop);
979}
980
981static inline struct nfs4_stateowner *
982alloc_stateowner(struct xdr_netobj *owner)
983{
984 struct nfs4_stateowner *sop;
985
986 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
987 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
988 memcpy(sop->so_owner.data, owner->data, owner->len);
989 sop->so_owner.len = owner->len;
990 kref_init(&sop->so_ref);
991 return sop;
992 }
993 kmem_cache_free(stateowner_slab, sop);
994 }
995 return NULL;
996}
997
998static struct nfs4_stateowner *
999alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1000 struct nfs4_stateowner *sop;
1001 struct nfs4_replay *rp;
1002 unsigned int idhashval;
1003
1004 if (!(sop = alloc_stateowner(&open->op_owner)))
1005 return NULL;
1006 idhashval = ownerid_hashval(current_ownerid);
1007 INIT_LIST_HEAD(&sop->so_idhash);
1008 INIT_LIST_HEAD(&sop->so_strhash);
1009 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1010 INIT_LIST_HEAD(&sop->so_stateids);
1011 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1012 INIT_LIST_HEAD(&sop->so_close_lru);
1013 sop->so_time = 0;
1014 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1015 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1016 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1017 sop->so_is_open_owner = 1;
1018 sop->so_id = current_ownerid++;
1019 sop->so_client = clp;
1020 sop->so_seqid = open->op_seqid;
1021 sop->so_confirmed = 0;
1022 rp = &sop->so_replay;
de1ae286 1023 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1024 rp->rp_buflen = 0;
1025 rp->rp_buf = rp->rp_ibuf;
1026 return sop;
1027}
1028
1029static void
1030release_stateid_lockowners(struct nfs4_stateid *open_stp)
1031{
1032 struct nfs4_stateowner *lock_sop;
1033
ea1da636
N		 1034 while (!list_empty(&open_stp->st_lockowners)) {
1035 lock_sop = list_entry(open_stp->st_lockowners.next,
1036 struct nfs4_stateowner, so_perstateid);
1037 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1038 BUG_ON(lock_sop->so_is_open_owner);
1039 release_stateowner(lock_sop);
1040 }
1041}
1042
1043static void
1044unhash_stateowner(struct nfs4_stateowner *sop)
1045{
1046 struct nfs4_stateid *stp;
1047
1048 list_del(&sop->so_idhash);
1049 list_del(&sop->so_strhash);
6fa305de 1050 if (sop->so_is_open_owner)
1da177e4 1051 list_del(&sop->so_perclient);
ea1da636
N		 1052 list_del(&sop->so_perstateid);
1053 while (!list_empty(&sop->so_stateids)) {
1054 stp = list_entry(sop->so_stateids.next,
1055 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1056 if (sop->so_is_open_owner)
1057 release_stateid(stp, OPEN_STATE);
1058 else
1059 release_stateid(stp, LOCK_STATE);
1060 }
1061}
1062
1063static void
1064release_stateowner(struct nfs4_stateowner *sop)
1065{
1066 unhash_stateowner(sop);
1067 list_del(&sop->so_close_lru);
1068 nfs4_put_stateowner(sop);
1069}
1070
1071static inline void
1072init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1073 struct nfs4_stateowner *sop = open->op_stateowner;
1074 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1075
1076 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1077 INIT_LIST_HEAD(&stp->st_perstateowner);
1078 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1079 INIT_LIST_HEAD(&stp->st_perfile);
1080 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1081 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1082 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1083 stp->st_stateowner = sop;
13cd2184 1084 get_nfs4_file(fp);
1da177e4
LT		 1085 stp->st_file = fp;
1086 stp->st_stateid.si_boot = boot_time;
1087 stp->st_stateid.si_stateownerid = sop->so_id;
1088 stp->st_stateid.si_fileid = fp->fi_id;
1089 stp->st_stateid.si_generation = 0;
1090 stp->st_access_bmap = 0;
1091 stp->st_deny_bmap = 0;
1092 __set_bit(open->op_share_access, &stp->st_access_bmap);
1093 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1094 stp->st_openstp = NULL;
1da177e4
LT		 1095}
1096
1097static void
1098release_stateid(struct nfs4_stateid *stp, int flags)
1099{
1100 struct file *filp = stp->st_vfs_file;
1101
1102 list_del(&stp->st_hash);
1da177e4 1103 list_del(&stp->st_perfile);
ea1da636 1104 list_del(&stp->st_perstateowner);
1da177e4
LT		 1105 if (flags & OPEN_STATE) {
1106 release_stateid_lockowners(stp);
1107 stp->st_vfs_file = NULL;
1108 nfsd_close(filp);
1da177e4
LT		 1109 } else if (flags & LOCK_STATE)
1110 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1111 put_nfs4_file(stp->st_file);
5ac049ac 1112 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1113}
1114
fd39ca9a 1115static void
1da177e4
LT		 1116move_to_close_lru(struct nfs4_stateowner *sop)
1117{
1118 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1119
358dd55a 1120 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1121 sop->so_time = get_seconds();
1122}
1123
1da177e4 1124static int
599e0a22
BF		 1125same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1126 clientid_t *clid)
1127{
1128 return (sop->so_owner.len == owner->len) &&
1129 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1130 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1131}
1132
1133static struct nfs4_stateowner *
1134find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1135{
1136 struct nfs4_stateowner *so = NULL;
1137
1138 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1139 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1140 return so;
1141 }
1142 return NULL;
1143}
1144
1145/* search file_hashtbl[] for file */
1146static struct nfs4_file *
1147find_file(struct inode *ino)
1148{
1149 unsigned int hashval = file_hashval(ino);
1150 struct nfs4_file *fp;
1151
1152 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1153 if (fp->fi_inode == ino) {
1154 get_nfs4_file(fp);
1da177e4 1155 return fp;
13cd2184 1156 }
1da177e4
LT		 1157 }
1158 return NULL;
1159}
1160
8838dc43 1161static inline int access_valid(u32 x)
ba5a6a19 1162{
8838dc43
BF		 1163 if (x < NFS4_SHARE_ACCESS_READ)
1164 return 0;
1165 if (x > NFS4_SHARE_ACCESS_BOTH)
1166 return 0;
1167 return 1;
ba5a6a19
BF		 1168}
1169
8838dc43 1170static inline int deny_valid(u32 x)
ba5a6a19 1171{
8838dc43
BF		 1172 /* Note: unlike access bits, deny bits may be zero. */
1173 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1174}
1da177e4 1175
fd39ca9a 1176static void
1da177e4
LT		 1177set_access(unsigned int *access, unsigned long bmap) {
1178 int i;
1179
1180 *access = 0;
1181 for (i = 1; i < 4; i++) {
1182 if (test_bit(i, &bmap))
1183 *access |= i;
1184 }
1185}
1186
fd39ca9a 1187static void
1da177e4
LT		 1188set_deny(unsigned int *deny, unsigned long bmap) {
1189 int i;
1190
1191 *deny = 0;
1192 for (i = 0; i < 4; i++) {
1193 if (test_bit(i, &bmap))
1194 *deny |= i ;
1195 }
1196}
1197
1198static int
1199test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1200 unsigned int access, deny;
1201
1202 set_access(&access, stp->st_access_bmap);
1203 set_deny(&deny, stp->st_deny_bmap);
1204 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1205 return 0;
1206 return 1;
1207}
1208
1209/*
1210 * Called to check deny when READ with all zero stateid or
1211 * WRITE with all zero or all one stateid
1212 */
b37ad28b 1213static __be32
1da177e4
LT		 1214nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1215{
1216 struct inode *ino = current_fh->fh_dentry->d_inode;
1217 struct nfs4_file *fp;
1218 struct nfs4_stateid *stp;
b37ad28b 1219 __be32 ret;
1da177e4
LT		 1220
1221 dprintk("NFSD: nfs4_share_conflict\n");
1222
1223 fp = find_file(ino);
13cd2184
N		 1224 if (!fp)
1225 return nfs_ok;
b700949b 1226 ret = nfserr_locked;
1da177e4 1227 /* Search for conflicting share reservations */
13cd2184
N		 1228 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1229 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1230 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1231 goto out;
1da177e4 1232 }
13cd2184
N		 1233 ret = nfs_ok;
1234out:
1235 put_nfs4_file(fp);
1236 return ret;
1da177e4
LT		 1237}
1238
1239static inline void
1240nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1241{
1242 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1243 drop_file_write_access(filp);
1da177e4
LT		 1244 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1245 }
1246}
1247
1248/*
1249 * Recall a delegation
1250 */
1251static int
1252do_recall(void *__dp)
1253{
1254 struct nfs4_delegation *dp = __dp;
1255
47f9940c 1256 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1257 nfsd4_cb_recall(dp);
1258 return 0;
1259}
1260
1261/*
1262 * Spawn a thread to perform a recall on the delegation represented
1263 * by the lease (file_lock)
1264 *
1265 * Called from break_lease() with lock_kernel() held.
1266 * Note: we assume break_lease will only call this *once* for any given
1267 * lease.
1268 */
1269static
1270void nfsd_break_deleg_cb(struct file_lock *fl)
1271{
1272 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1273 struct task_struct *t;
1274
1275 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1276 if (!dp)
1277 return;
1278
1279 /* We're assuming the state code never drops its reference
1280 * without first removing the lease. Since we're in this lease
1281 * callback (and since the lease code is serialized by the kernel
1282 * lock) we know the server hasn't removed the lease yet, we know
1283 * it's safe to take a reference: */
1284 atomic_inc(&dp->dl_count);
cfdcad4d 1285 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1286
1287 spin_lock(&recall_lock);
1288 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1289 spin_unlock(&recall_lock);
1290
1291 /* only place dl_time is set. protected by lock_kernel*/
1292 dp->dl_time = get_seconds();
1293
0272e1fd
BF		 1294 /*
1295 * We don't want the locks code to timeout the lease for us;
1296 * we'll remove it ourself if the delegation isn't returned
1297 * in time.
1298 */
1299 fl->fl_break_time = 0;
1da177e4
LT		 1300
1301 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1302 if (IS_ERR(t)) {
1303 struct nfs4_client *clp = dp->dl_client;
1304
1305 printk(KERN_INFO "NFSD: Callback thread failed for "
1306 "for client (clientid %08x/%08x)\n",
1307 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1308 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1309 nfs4_put_delegation(dp);
1310 }
1311}
1312
1313/*
1314 * The file_lock is being reapd.
1315 *
1316 * Called by locks_free_lock() with lock_kernel() held.
1317 */
1318static
1319void nfsd_release_deleg_cb(struct file_lock *fl)
1320{
1321 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1322
1323 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1324
1325 if (!(fl->fl_flags & FL_LEASE) || !dp)
1326 return;
1327 dp->dl_flock = NULL;
1328}
1329
1330/*
1331 * Set the delegation file_lock back pointer.
1332 *
a9933cea 1333 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1334 */
1335static
1336void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1337{
1338 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1339
1340 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1341 if (!dp)
1342 return;
1343 dp->dl_flock = new;
1344}
1345
1346/*
a9933cea 1347 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1348 */
1349static
1350int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1351{
1352 struct nfs4_delegation *onlistd =
1353 (struct nfs4_delegation *)onlist->fl_owner;
1354 struct nfs4_delegation *tryd =
1355 (struct nfs4_delegation *)try->fl_owner;
1356
1357 if (onlist->fl_lmops != try->fl_lmops)
1358 return 0;
1359
1360 return onlistd->dl_client == tryd->dl_client;
1361}
1362
1363
1364static
1365int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1366{
1367 if (arg & F_UNLCK)
1368 return lease_modify(onlist, arg);
1369 else
1370 return -EAGAIN;
1371}
1372
fd39ca9a 1373static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1374 .fl_break = nfsd_break_deleg_cb,
1375 .fl_release_private = nfsd_release_deleg_cb,
1376 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1377 .fl_mylease = nfsd_same_client_deleg_cb,
1378 .fl_change = nfsd_change_deleg_cb,
1379};
1380
1381
b37ad28b 1382__be32
1da177e4
LT		 1383nfsd4_process_open1(struct nfsd4_open *open)
1384{
1da177e4
LT		 1385 clientid_t *clientid = &open->op_clientid;
1386 struct nfs4_client *clp = NULL;
1387 unsigned int strhashval;
1388 struct nfs4_stateowner *sop = NULL;
1389
1da177e4 1390 if (!check_name(open->op_owner))
0f442aa2 1391 return nfserr_inval;
1da177e4
LT		 1392
1393 if (STALE_CLIENTID(&open->op_clientid))
1394 return nfserr_stale_clientid;
1395
1396 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1397 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1398 open->op_stateowner = sop;
1399 if (!sop) {
1400 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1401 clp = find_confirmed_client(clientid);
1402 if (clp == NULL)
0f442aa2
BF		 1403 return nfserr_expired;
1404 goto renew;
1da177e4 1405 }
0f442aa2
BF		 1406 if (!sop->so_confirmed) {
1407 /* Replace unconfirmed owners without checking for replay. */
1408 clp = sop->so_client;
1409 release_stateowner(sop);
1410 open->op_stateowner = NULL;
1411 goto renew;
1412 }
1413 if (open->op_seqid == sop->so_seqid - 1) {
1414 if (sop->so_replay.rp_buflen)
a90b061c 1415 return nfserr_replay_me;
0f442aa2
BF		 1416 /* The original OPEN failed so spectacularly
1417 * that we don't even have replay data saved!
1418 * Therefore, we have no choice but to continue
1419 * processing this OPEN; presumably, we'll
1420 * fail again for the same reason.
1421 */
1422 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1423 goto renew;
1424 }
1425 if (open->op_seqid != sop->so_seqid)
1426 return nfserr_bad_seqid;
1da177e4 1427renew:
0f442aa2
BF		 1428 if (open->op_stateowner == NULL) {
1429 sop = alloc_init_open_stateowner(strhashval, clp, open);
1430 if (sop == NULL)
1431 return nfserr_resource;
1432 open->op_stateowner = sop;
1433 }
1434 list_del_init(&sop->so_close_lru);
1da177e4 1435 renew_client(sop->so_client);
0f442aa2 1436 return nfs_ok;
1da177e4
LT		 1437}
1438
b37ad28b 1439static inline __be32
4a6e43e6
N		 1440nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1441{
1442 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1443 return nfserr_openmode;
1444 else
1445 return nfs_ok;
1446}
1447
52f4fb43
N		 1448static struct nfs4_delegation *
1449find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1450{
1451 struct nfs4_delegation *dp;
1452
ea1da636 1453 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1454 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1455 return dp;
1456 }
1457 return NULL;
1458}
1459
b37ad28b 1460static __be32
567d9829
N		 1461nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1462 struct nfs4_delegation **dp)
1463{
1464 int flags;
b37ad28b 1465 __be32 status = nfserr_bad_stateid;
567d9829
N		 1466
1467 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1468 if (*dp == NULL)
c44c5eeb 1469 goto out;
567d9829
N		 1470 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1471 RD_STATE : WR_STATE;
1472 status = nfs4_check_delegmode(*dp, flags);
1473 if (status)
1474 *dp = NULL;
c44c5eeb
N		 1475out:
1476 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1477 return nfs_ok;
1478 if (status)
1479 return status;
1480 open->op_stateowner->so_confirmed = 1;
1481 return nfs_ok;
567d9829
N		 1482}
1483
b37ad28b 1484static __be32
1da177e4
LT		 1485nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1486{
1487 struct nfs4_stateid *local;
b37ad28b 1488 __be32 status = nfserr_share_denied;
1da177e4
LT		 1489 struct nfs4_stateowner *sop = open->op_stateowner;
1490
8beefa24 1491 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1492 /* ignore lock owners */
1493 if (local->st_stateowner->so_is_open_owner == 0)
1494 continue;
1495 /* remember if we have seen this open owner */
1496 if (local->st_stateowner == sop)
1497 *stpp = local;
1498 /* check for conflicting share reservations */
1499 if (!test_share(local, open))
1500 goto out;
1501 }
1502 status = 0;
1503out:
1504 return status;
1505}
1506
5ac049ac
N		 1507static inline struct nfs4_stateid *
1508nfs4_alloc_stateid(void)
1509{
1510 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1511}
1512
b37ad28b 1513static __be32
1da177e4 1514nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1515 struct nfs4_delegation *dp,
1da177e4
LT		 1516 struct svc_fh *cur_fh, int flags)
1517{
1518 struct nfs4_stateid *stp;
1da177e4 1519
5ac049ac 1520 stp = nfs4_alloc_stateid();
1da177e4
LT		 1521 if (stp == NULL)
1522 return nfserr_resource;
1523
567d9829
N		 1524 if (dp) {
1525 get_file(dp->dl_vfs_file);
1526 stp->st_vfs_file = dp->dl_vfs_file;
1527 } else {
b37ad28b 1528 __be32 status;
567d9829
N		 1529 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1530 &stp->st_vfs_file);
1531 if (status) {
1532 if (status == nfserr_dropit)
1533 status = nfserr_jukebox;
5ac049ac 1534 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1535 return status;
1536 }
1da177e4 1537 }
1da177e4
LT		 1538 *stpp = stp;
1539 return 0;
1540}
1541
b37ad28b 1542static inline __be32
1da177e4
LT		 1543nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1544 struct nfsd4_open *open)
1545{
1546 struct iattr iattr = {
1547 .ia_valid = ATTR_SIZE,
1548 .ia_size = 0,
1549 };
1550 if (!open->op_truncate)
1551 return 0;
1552 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1553 return nfserr_inval;
1da177e4
LT		 1554 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1555}
1556
b37ad28b 1557static __be32
1da177e4
LT		 1558nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1559{
1560 struct file *filp = stp->st_vfs_file;
7eaa36e2 1561 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1562 unsigned int share_access, new_writer;
b37ad28b 1563 __be32 status;
1da177e4
LT		 1564
1565 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1566 new_writer = (~share_access) & open->op_share_access
1567 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1568
6c26d08f 1569 if (new_writer) {
b37ad28b
AV		 1570 int err = get_write_access(inode);
1571 if (err)
1572 return nfserrno(err);
6c26d08f 1573 }
1da177e4
LT		 1574 status = nfsd4_truncate(rqstp, cur_fh, open);
1575 if (status) {
6c26d08f
BF		 1576 if (new_writer)
1577 put_write_access(inode);
1da177e4
LT		 1578 return status;
1579 }
1580 /* remember the open */
6c26d08f 1581 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1582 set_bit(open->op_share_access, &stp->st_access_bmap);
1583 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1584
1585 return nfs_ok;
1586}
1587
1588
1da177e4 1589static void
37515177 1590nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1591{
37515177
N		 1592 open->op_stateowner->so_confirmed = 1;
1593 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1594}
1595
1596/*
1597 * Attempt to hand out a delegation.
1598 */
1599static void
1600nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1601{
1602 struct nfs4_delegation *dp;
1603 struct nfs4_stateowner *sop = stp->st_stateowner;
1604 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1605 struct file_lock fl, *flp = &fl;
1606 int status, flag = 0;
1607
1608 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1609 open->op_recall = 0;
1610 switch (open->op_claim_type) {
1611 case NFS4_OPEN_CLAIM_PREVIOUS:
1612 if (!atomic_read(&cb->cb_set))
1613 open->op_recall = 1;
1614 flag = open->op_delegate_type;
1615 if (flag == NFS4_OPEN_DELEGATE_NONE)
1616 goto out;
1617 break;
1618 case NFS4_OPEN_CLAIM_NULL:
1619 /* Let's not give out any delegations till everyone's
1620 * had the chance to reclaim theirs.... */
1621 if (nfs4_in_grace())
1622 goto out;
1623 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1624 goto out;
1625 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1626 flag = NFS4_OPEN_DELEGATE_WRITE;
1627 else
1628 flag = NFS4_OPEN_DELEGATE_READ;
1629 break;
1630 default:
1631 goto out;
1632 }
1da177e4
LT		 1633
1634 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1635 if (dp == NULL) {
1636 flag = NFS4_OPEN_DELEGATE_NONE;
1637 goto out;
1638 }
1639 locks_init_lock(&fl);
1640 fl.fl_lmops = &nfsd_lease_mng_ops;
1641 fl.fl_flags = FL_LEASE;
1642 fl.fl_end = OFFSET_MAX;
1643 fl.fl_owner = (fl_owner_t)dp;
1644 fl.fl_file = stp->st_vfs_file;
1645 fl.fl_pid = current->tgid;
1646
a9933cea 1647 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1648 * the lock_manager callbacks fl_mylease and fl_change are used
1649 */
a9933cea 1650 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1651 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1652 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1653 unhash_delegation(dp);
1da177e4
LT		 1654 flag = NFS4_OPEN_DELEGATE_NONE;
1655 goto out;
1656 }
1657
1658 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1659
1660 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1661 dp->dl_stateid.si_boot,
1662 dp->dl_stateid.si_stateownerid,
1663 dp->dl_stateid.si_fileid,
1664 dp->dl_stateid.si_generation);
1665out:
7b190fec
N		 1666 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1667 && flag == NFS4_OPEN_DELEGATE_NONE
1668 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1669 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1670 open->op_delegate_type = flag;
1671}
1672
1673/*
1674 * called with nfs4_lock_state() held.
1675 */
b37ad28b 1676__be32
1da177e4
LT		 1677nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1678{
1679 struct nfs4_file *fp = NULL;
1680 struct inode *ino = current_fh->fh_dentry->d_inode;
1681 struct nfs4_stateid *stp = NULL;
567d9829 1682 struct nfs4_delegation *dp = NULL;
b37ad28b 1683 __be32 status;
1da177e4
LT		 1684
1685 status = nfserr_inval;
ba5a6a19
BF		 1686 if (!access_valid(open->op_share_access)
1687 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1688 goto out;
1689 /*
1690 * Lookup file; if found, lookup stateid and check open request,
1691 * and check for delegations in the process of being recalled.
1692 * If not found, create the nfs4_file struct
1693 */
1694 fp = find_file(ino);
1695 if (fp) {
1696 if ((status = nfs4_check_open(fp, open, &stp)))
1697 goto out;
c44c5eeb
N		 1698 status = nfs4_check_deleg(fp, open, &dp);
1699 if (status)
1700 goto out;
1da177e4 1701 } else {
c44c5eeb
N		 1702 status = nfserr_bad_stateid;
1703 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1704 goto out;
1da177e4
LT		 1705 status = nfserr_resource;
1706 fp = alloc_init_file(ino);
1707 if (fp == NULL)
1708 goto out;
1709 }
1710
1711 /*
1712 * OPEN the file, or upgrade an existing OPEN.
1713 * If truncate fails, the OPEN fails.
1714 */
1715 if (stp) {
1716 /* Stateid was found, this is an OPEN upgrade */
1717 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1718 if (status)
1719 goto out;
444c2c07 1720 update_stateid(&stp->st_stateid);
1da177e4
LT		 1721 } else {
1722 /* Stateid was not found, this is a new OPEN */
1723 int flags = 0;
9ecb6a08
BF		 1724 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1725 flags |= MAY_READ;
1da177e4 1726 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1727 flags |= MAY_WRITE;
567d9829
N		 1728 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1729 if (status)
1da177e4
LT		 1730 goto out;
1731 init_stateid(stp, fp, open);
1732 status = nfsd4_truncate(rqstp, current_fh, open);
1733 if (status) {
1734 release_stateid(stp, OPEN_STATE);
1735 goto out;
1736 }
1737 }
1738 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1739
1740 /*
1741 * Attempt to hand out a delegation. No error return, because the
1742 * OPEN succeeds even if we fail.
1743 */
1744 nfs4_open_delegation(current_fh, open, stp);
1745
1746 status = nfs_ok;
1747
1748 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1749 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1750 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1751out:
13cd2184
N		 1752 if (fp)
1753 put_nfs4_file(fp);
37515177
N		 1754 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1755 nfs4_set_claim_prev(open);
1da177e4
LT		 1756 /*
1757 * To finish the open response, we just need to set the rflags.
1758 */
1759 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1760 if (!open->op_stateowner->so_confirmed)
1761 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1762
1763 return status;
1764}
1765
58da282b 1766static struct workqueue_struct *laundry_wq;
c4028958
DH		 1767static void laundromat_main(struct work_struct *);
1768static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1769
b37ad28b 1770__be32
b591480b
BF		 1771nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1772 clientid_t *clid)
1da177e4
LT		 1773{
1774 struct nfs4_client *clp;
b37ad28b 1775 __be32 status;
1da177e4
LT		 1776
1777 nfs4_lock_state();
1778 dprintk("process_renew(%08x/%08x): starting\n",
1779 clid->cl_boot, clid->cl_id);
1780 status = nfserr_stale_clientid;
1781 if (STALE_CLIENTID(clid))
1782 goto out;
1783 clp = find_confirmed_client(clid);
1784 status = nfserr_expired;
1785 if (clp == NULL) {
1786 /* We assume the client took too long to RENEW. */
1787 dprintk("nfsd4_renew: clientid not found!\n");
1788 goto out;
1789 }
1790 renew_client(clp);
1791 status = nfserr_cb_path_down;
ea1da636 1792 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1793 && !atomic_read(&clp->cl_callback.cb_set))
1794 goto out;
1795 status = nfs_ok;
1796out:
1797 nfs4_unlock_state();
1798 return status;
1799}
1800
a76b4319
N		 1801static void
1802end_grace(void)
1803{
1804 dprintk("NFSD: end of grace period\n");
c7b9a459 1805 nfsd4_recdir_purge_old();
a76b4319
N		 1806 in_grace = 0;
1807}
1808
fd39ca9a 1809static time_t
1da177e4
LT		 1810nfs4_laundromat(void)
1811{
1812 struct nfs4_client *clp;
1813 struct nfs4_stateowner *sop;
1814 struct nfs4_delegation *dp;
1815 struct list_head *pos, *next, reaplist;
1816 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1817 time_t t, clientid_val = NFSD_LEASE_TIME;
1818 time_t u, test_val = NFSD_LEASE_TIME;
1819
1820 nfs4_lock_state();
1821
1822 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1823 if (in_grace)
1824 end_grace();
1da177e4
LT		 1825 list_for_each_safe(pos, next, &client_lru) {
1826 clp = list_entry(pos, struct nfs4_client, cl_lru);
1827 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1828 t = clp->cl_time - cutoff;
1829 if (clientid_val > t)
1830 clientid_val = t;
1831 break;
1832 }
1833 dprintk("NFSD: purging unused client (clientid %08x)\n",
1834 clp->cl_clientid.cl_id);
c7b9a459 1835 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1836 expire_client(clp);
1837 }
1838 INIT_LIST_HEAD(&reaplist);
1839 spin_lock(&recall_lock);
1840 list_for_each_safe(pos, next, &del_recall_lru) {
1841 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1842 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1843 u = dp->dl_time - cutoff;
1844 if (test_val > u)
1845 test_val = u;
1846 break;
1847 }
1848 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1849 dp, dp->dl_flock);
1850 list_move(&dp->dl_recall_lru, &reaplist);
1851 }
1852 spin_unlock(&recall_lock);
1853 list_for_each_safe(pos, next, &reaplist) {
1854 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1855 list_del_init(&dp->dl_recall_lru);
1856 unhash_delegation(dp);
1857 }
1858 test_val = NFSD_LEASE_TIME;
1859 list_for_each_safe(pos, next, &close_lru) {
1860 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1861 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1862 u = sop->so_time - cutoff;
1863 if (test_val > u)
1864 test_val = u;
1865 break;
1866 }
1867 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1868 sop->so_id);
358dd55a 1869 release_stateowner(sop);
1da177e4
LT		 1870 }
1871 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1872 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1873 nfs4_unlock_state();
1874 return clientid_val;
1875}
1876
1877void
c4028958 1878laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1879{
1880 time_t t;
1881
1882 t = nfs4_laundromat();
1883 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1884 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1885}
1886
fd39ca9a 1887static struct nfs4_stateowner *
f8816512
N		 1888search_close_lru(u32 st_id, int flags)
1889{
1da177e4
LT		 1890 struct nfs4_stateowner *local = NULL;
1891
1da177e4
LT		 1892 if (flags & CLOSE_STATE) {
1893 list_for_each_entry(local, &close_lru, so_close_lru) {
1894 if (local->so_id == st_id)
1895 return local;
1896 }
1897 }
1898 return NULL;
1899}
1900
1901static inline int
1902nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1903{
7eaa36e2 1904 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1905}
1906
1907static int
1908STALE_STATEID(stateid_t *stateid)
1909{
1910 if (stateid->si_boot == boot_time)
1911 return 0;
849823c5 1912 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1913 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1914 stateid->si_generation);
1915 return 1;
1916}
1917
1918static inline int
1919access_permit_read(unsigned long access_bmap)
1920{
1921 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1922 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1923 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1924}
1925
1926static inline int
1927access_permit_write(unsigned long access_bmap)
1928{
1929 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1930 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1931}
1932
1933static
b37ad28b 1934__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1935{
b37ad28b 1936 __be32 status = nfserr_openmode;
1da177e4
LT		 1937
1938 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1939 goto out;
1940 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1941 goto out;
1942 status = nfs_ok;
1943out:
1944 return status;
1945}
1946
b37ad28b 1947static inline __be32
1da177e4
LT		 1948check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1949{
1950 /* Trying to call delegreturn with a special stateid? Yuch: */
1951 if (!(flags & (RD_STATE | WR_STATE)))
1952 return nfserr_bad_stateid;
1953 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1954 return nfs_ok;
1955 else if (nfs4_in_grace()) {
1956 /* Answer in remaining cases depends on existance of
1957 * conflicting state; so we must wait out the grace period. */
1958 return nfserr_grace;
1959 } else if (flags & WR_STATE)
1960 return nfs4_share_conflict(current_fh,
1961 NFS4_SHARE_DENY_WRITE);
1962 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1963 return nfs4_share_conflict(current_fh,
1964 NFS4_SHARE_DENY_READ);
1965}
1966
1967/*
1968 * Allow READ/WRITE during grace period on recovered state only for files
1969 * that are not able to provide mandatory locking.
1970 */
1971static inline int
1972io_during_grace_disallowed(struct inode *inode, int flags)
1973{
1974 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 1975 && mandatory_lock(inode);
1da177e4
LT		 1976}
1977
0836f587
BF		 1978static int check_stateid_generation(stateid_t *in, stateid_t *ref)
1979{
1980 /* If the client sends us a stateid from the future, it's buggy: */
1981 if (in->si_generation > ref->si_generation)
1982 return nfserr_bad_stateid;
1983 /*
1984 * The following, however, can happen. For example, if the
1985 * client sends an open and some IO at the same time, the open
1986 * may bump si_generation while the IO is still in flight.
1987 * Thanks to hard links and renames, the client never knows what
1988 * file an open will affect. So it could avoid that situation
1989 * only by serializing all opens and IO from the same open
1990 * owner. To recover from the old_stateid error, the client
1991 * will just have to retry the IO:
1992 */
1993 if (in->si_generation < ref->si_generation)
1994 return nfserr_old_stateid;
1995 return nfs_ok;
1996}
1997
1da177e4
LT		 1998/*
1999* Checks for stateid operations
2000*/
b37ad28b 2001__be32
1da177e4
LT		 2002nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2003{
2004 struct nfs4_stateid *stp = NULL;
2005 struct nfs4_delegation *dp = NULL;
2006 stateid_t *stidp;
2007 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2008 __be32 status;
1da177e4
LT		 2009
2010 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2011 stateid->si_boot, stateid->si_stateownerid,
2012 stateid->si_fileid, stateid->si_generation);
2013 if (filpp)
2014 *filpp = NULL;
2015
2016 if (io_during_grace_disallowed(ino, flags))
2017 return nfserr_grace;
2018
2019 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2020 return check_special_stateids(current_fh, stateid, flags);
2021
2022 /* STALE STATEID */
2023 status = nfserr_stale_stateid;
2024 if (STALE_STATEID(stateid))
2025 goto out;
2026
2027 /* BAD STATEID */
2028 status = nfserr_bad_stateid;
2029 if (!stateid->si_fileid) { /* delegation stateid */
2030 if(!(dp = find_delegation_stateid(ino, stateid))) {
2031 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2032 goto out;
2033 }
2034 stidp = &dp->dl_stateid;
2035 } else { /* open or lock stateid */
2036 if (!(stp = find_stateid(stateid, flags))) {
2037 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2038 goto out;
2039 }
2040 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2041 goto out;
2042 if (!stp->st_stateowner->so_confirmed)
2043 goto out;
2044 stidp = &stp->st_stateid;
2045 }
0836f587
BF		 2046 status = check_stateid_generation(stateid, stidp);
2047 if (status)
1da177e4
LT		 2048 goto out;
2049 if (stp) {
2050 if ((status = nfs4_check_openmode(stp,flags)))
2051 goto out;
2052 renew_client(stp->st_stateowner->so_client);
2053 if (filpp)
2054 *filpp = stp->st_vfs_file;
2055 } else if (dp) {
2056 if ((status = nfs4_check_delegmode(dp, flags)))
2057 goto out;
2058 renew_client(dp->dl_client);
2059 if (flags & DELEG_RET)
2060 unhash_delegation(dp);
2061 if (filpp)
2062 *filpp = dp->dl_vfs_file;
2063 }
2064 status = nfs_ok;
2065out:
2066 return status;
2067}
2068
4c4cd222
N		 2069static inline int
2070setlkflg (int type)
2071{
2072 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2073 RD_STATE : WR_STATE;
2074}
1da177e4
LT		 2075
2076/*
2077 * Checks for sequence id mutating operations.
2078 */
b37ad28b 2079static __be32
4c4cd222 2080nfs4_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 2081{
1da177e4
LT		 2082 struct nfs4_stateid *stp;
2083 struct nfs4_stateowner *sop;
0836f587 2084 __be32 status;
1da177e4
LT		 2085
2086 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2087 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2088 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2089 stateid->si_generation);
3a4f98bb 2090
1da177e4
LT		 2091 *stpp = NULL;
2092 *sopp = NULL;
2093
1da177e4 2094 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2095 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2096 return nfserr_bad_stateid;
1da177e4
LT		 2097 }
2098
1da177e4 2099 if (STALE_STATEID(stateid))
3a4f98bb 2100 return nfserr_stale_stateid;
1da177e4
LT		 2101 /*
2102 * We return BAD_STATEID if filehandle doesn't match stateid,
2103 * the confirmed flag is incorrecly set, or the generation
2104 * number is incorrect.
1da177e4 2105 */
f8816512
N		 2106 stp = find_stateid(stateid, flags);
2107 if (stp == NULL) {
2108 /*
2109 * Also, we should make sure this isn't just the result of
2110 * a replayed close:
2111 */
2112 sop = search_close_lru(stateid->si_stateownerid, flags);
2113 if (sop == NULL)
2114 return nfserr_bad_stateid;
2115 *sopp = sop;
2116 goto check_replay;
2117 }
1da177e4 2118
39325bd0
BF		 2119 *stpp = stp;
2120 *sopp = sop = stp->st_stateowner;
2121
4c4cd222 2122 if (lock) {
4c4cd222 2123 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2124 struct nfs4_client *clp = sop->so_client;
4c4cd222 2125 int lkflg = 0;
b37ad28b 2126 __be32 status;
4c4cd222
N		 2127
2128 lkflg = setlkflg(lock->lk_type);
2129
2130 if (lock->lk_is_new) {
599e0a22
BF		 2131 if (!sop->so_is_open_owner)
2132 return nfserr_bad_stateid;
2133 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2134 return nfserr_bad_stateid;
599e0a22
BF		 2135 /* stp is the open stateid */
2136 status = nfs4_check_openmode(stp, lkflg);
2137 if (status)
2138 return status;
2139 } else {
2140 /* stp is the lock stateid */
2141 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2142 if (status)
2143 return status;
4c4cd222 2144 }
1da177e4
LT		 2145 }
2146
f3362737 2147 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2148 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2149 return nfserr_bad_stateid;
1da177e4
LT		 2150 }
2151
1da177e4
LT		 2152 /*
2153 * We now validate the seqid and stateid generation numbers.
2154 * For the moment, we ignore the possibility of
2155 * generation number wraparound.
2156 */
bd9aac52 2157 if (seqid != sop->so_seqid)
1da177e4
LT		 2158 goto check_replay;
2159
3a4f98bb 2160 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2161 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2162 " unconfirmed stateowner!\n");
2163 return nfserr_bad_stateid;
1da177e4 2164 }
3a4f98bb 2165 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2166 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2167 " confirmed yet!\n");
2168 return nfserr_bad_stateid;
1da177e4 2169 }
0836f587
BF		 2170 status = check_stateid_generation(stateid, &stp->st_stateid);
2171 if (status)
2172 return status;
52fd004e 2173 renew_client(sop->so_client);
3a4f98bb 2174 return nfs_ok;
1da177e4 2175
1da177e4 2176check_replay:
bd9aac52 2177 if (seqid == sop->so_seqid - 1) {
849823c5 2178 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2179 /* indicate replay to calling function */
a90b061c 2180 return nfserr_replay_me;
1da177e4 2181 }
2fdada03 2182 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2183 sop->so_seqid, seqid);
2184 *sopp = NULL;
2185 return nfserr_bad_seqid;
1da177e4
LT		 2186}
2187
b37ad28b 2188__be32
ca364317 2189nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2190 struct nfsd4_open_confirm *oc)
1da177e4 2191{
b37ad28b 2192 __be32 status;
1da177e4
LT		 2193 struct nfs4_stateowner *sop;
2194 struct nfs4_stateid *stp;
2195
2196 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2197 (int)cstate->current_fh.fh_dentry->d_name.len,
2198 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2199
ca364317 2200 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2201 if (status)
2202 return status;
1da177e4
LT		 2203
2204 nfs4_lock_state();
2205
ca364317
BF		 2206 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2207 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2208 CONFIRM | OPEN_STATE,
1da177e4
LT		 2209 &oc->oc_stateowner, &stp, NULL)))
2210 goto out;
2211
2212 sop = oc->oc_stateowner;
2213 sop->so_confirmed = 1;
2214 update_stateid(&stp->st_stateid);
2215 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2216 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2217 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2218 stp->st_stateid.si_boot,
2219 stp->st_stateid.si_stateownerid,
2220 stp->st_stateid.si_fileid,
2221 stp->st_stateid.si_generation);
c7b9a459
N		 2222
2223 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2224out:
f2327d9a 2225 if (oc->oc_stateowner) {
1da177e4 2226 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2227 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2228 }
1da177e4
LT		 2229 nfs4_unlock_state();
2230 return status;
2231}
2232
2233
2234/*
2235 * unset all bits in union bitmap (bmap) that
2236 * do not exist in share (from successful OPEN_DOWNGRADE)
2237 */
2238static void
2239reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2240{
2241 int i;
2242 for (i = 1; i < 4; i++) {
2243 if ((i & access) != i)
2244 __clear_bit(i, bmap);
2245 }
2246}
2247
2248static void
2249reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2250{
2251 int i;
2252 for (i = 0; i < 4; i++) {
2253 if ((i & deny) != i)
2254 __clear_bit(i, bmap);
2255 }
2256}
2257
b37ad28b 2258__be32
ca364317
BF		 2259nfsd4_open_downgrade(struct svc_rqst *rqstp,
2260 struct nfsd4_compound_state *cstate,
a4f1706a 2261 struct nfsd4_open_downgrade *od)
1da177e4 2262{
b37ad28b 2263 __be32 status;
1da177e4
LT		 2264 struct nfs4_stateid *stp;
2265 unsigned int share_access;
2266
2267 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2268 (int)cstate->current_fh.fh_dentry->d_name.len,
2269 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2270
ba5a6a19
BF		 2271 if (!access_valid(od->od_share_access)
2272 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2273 return nfserr_inval;
2274
2275 nfs4_lock_state();
ca364317
BF		 2276 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2277 od->od_seqid,
1da177e4 2278 &od->od_stateid,
f3362737 2279 OPEN_STATE,
1da177e4
LT		 2280 &od->od_stateowner, &stp, NULL)))
2281 goto out;
2282
2283 status = nfserr_inval;
2284 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2285 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2286 stp->st_access_bmap, od->od_share_access);
2287 goto out;
2288 }
2289 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2290 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2291 stp->st_deny_bmap, od->od_share_deny);
2292 goto out;
2293 }
2294 set_access(&share_access, stp->st_access_bmap);
2295 nfs4_file_downgrade(stp->st_vfs_file,
2296 share_access & ~od->od_share_access);
2297
2298 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2299 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2300
2301 update_stateid(&stp->st_stateid);
2302 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2303 status = nfs_ok;
2304out:
f2327d9a 2305 if (od->od_stateowner) {
1da177e4 2306 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2307 cstate->replay_owner = od->od_stateowner;
f2327d9a 2308 }
1da177e4
LT		 2309 nfs4_unlock_state();
2310 return status;
2311}
2312
2313/*
2314 * nfs4_unlock_state() called after encode
2315 */
b37ad28b 2316__be32
ca364317 2317nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2318 struct nfsd4_close *close)
1da177e4 2319{
b37ad28b 2320 __be32 status;
1da177e4
LT		 2321 struct nfs4_stateid *stp;
2322
2323 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2324 (int)cstate->current_fh.fh_dentry->d_name.len,
2325 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2326
2327 nfs4_lock_state();
2328 /* check close_lru for replay */
ca364317
BF		 2329 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2330 close->cl_seqid,
1da177e4 2331 &close->cl_stateid,
f3362737 2332 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2333 &close->cl_stateowner, &stp, NULL)))
2334 goto out;
1da177e4
LT		 2335 status = nfs_ok;
2336 update_stateid(&stp->st_stateid);
2337 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2338
04ef5954
BF		 2339 /* release_stateid() calls nfsd_close() if needed */
2340 release_stateid(stp, OPEN_STATE);
2341
2342 /* place unused nfs4_stateowners on so_close_lru list to be
2343 * released by the laundromat service after the lease period
2344 * to enable us to handle CLOSE replay
2345 */
2346 if (list_empty(&close->cl_stateowner->so_stateids))
2347 move_to_close_lru(close->cl_stateowner);
1da177e4 2348out:
f2327d9a 2349 if (close->cl_stateowner) {
1da177e4 2350 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2351 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2352 }
1da177e4
LT		 2353 nfs4_unlock_state();
2354 return status;
2355}
2356
b37ad28b 2357__be32
ca364317
BF		 2358nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2359 struct nfsd4_delegreturn *dr)
1da177e4 2360{
b37ad28b 2361 __be32 status;
1da177e4 2362
ca364317 2363 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2364 goto out;
2365
2366 nfs4_lock_state();
ca364317
BF		 2367 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2368 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2369 nfs4_unlock_state();
2370out:
2371 return status;
2372}
2373
2374
2375/*
2376 * Lock owner state (byte-range locks)
2377 */
2378#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2379#define LOCK_HASH_BITS 8
2380#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2381#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2382
2383#define lockownerid_hashval(id) \
2384 ((id) & LOCK_HASH_MASK)
2385
2386static inline unsigned int
2387lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2388 struct xdr_netobj *ownername)
2389{
2390 return (file_hashval(inode) + cl_id
2391 + opaque_hashval(ownername->data, ownername->len))
2392 & LOCK_HASH_MASK;
2393}
2394
2395static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2396static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2397static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2398
fd39ca9a 2399static struct nfs4_stateid *
1da177e4
LT		 2400find_stateid(stateid_t *stid, int flags)
2401{
2402 struct nfs4_stateid *local = NULL;
2403 u32 st_id = stid->si_stateownerid;
2404 u32 f_id = stid->si_fileid;
2405 unsigned int hashval;
2406
2407 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2408 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2409 hashval = stateid_hashval(st_id, f_id);
2410 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2411 if ((local->st_stateid.si_stateownerid == st_id) &&
2412 (local->st_stateid.si_fileid == f_id))
2413 return local;
2414 }
2415 }
2416 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2417 hashval = stateid_hashval(st_id, f_id);
2418 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2419 if ((local->st_stateid.si_stateownerid == st_id) &&
2420 (local->st_stateid.si_fileid == f_id))
2421 return local;
2422 }
849823c5 2423 }
1da177e4
LT		 2424 return NULL;
2425}
2426
2427static struct nfs4_delegation *
2428find_delegation_stateid(struct inode *ino, stateid_t *stid)
2429{
13cd2184
N		 2430 struct nfs4_file *fp;
2431 struct nfs4_delegation *dl;
1da177e4
LT		 2432
2433 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2434 stid->si_boot, stid->si_stateownerid,
2435 stid->si_fileid, stid->si_generation);
2436
1da177e4 2437 fp = find_file(ino);
13cd2184
N		 2438 if (!fp)
2439 return NULL;
2440 dl = find_delegation_file(fp, stid);
2441 put_nfs4_file(fp);
2442 return dl;
1da177e4
LT		 2443}
2444
2445/*
2446 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2447 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2448 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2449 * locking, this prevents us from being completely protocol-compliant. The
2450 * real solution to this problem is to start using unsigned file offsets in
2451 * the VFS, but this is a very deep change!
2452 */
2453static inline void
2454nfs4_transform_lock_offset(struct file_lock *lock)
2455{
2456 if (lock->fl_start < 0)
2457 lock->fl_start = OFFSET_MAX;
2458 if (lock->fl_end < 0)
2459 lock->fl_end = OFFSET_MAX;
2460}
2461
d5b9026a
N		 2462/* Hack!: For now, we're defining this just so we can use a pointer to it
2463 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2464static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2465};
1da177e4
LT		 2466
2467static inline void
2468nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2469{
d5b9026a
N		 2470 struct nfs4_stateowner *sop;
2471 unsigned int hval;
1da177e4 2472
d5b9026a
N		 2473 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2474 sop = (struct nfs4_stateowner *) fl->fl_owner;
2475 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2476 kref_get(&sop->so_ref);
2477 deny->ld_sop = sop;
2478 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2479 } else {
2480 deny->ld_sop = NULL;
2481 deny->ld_clientid.cl_boot = 0;
2482 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2483 }
2484 deny->ld_start = fl->fl_start;
2485 deny->ld_length = ~(u64)0;
2486 if (fl->fl_end != ~(u64)0)
2487 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2488 deny->ld_type = NFS4_READ_LT;
2489 if (fl->fl_type != F_RDLCK)
2490 deny->ld_type = NFS4_WRITE_LT;
2491}
2492
1da177e4
LT		 2493static struct nfs4_stateowner *
2494find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2495 struct xdr_netobj *owner)
2496{
2497 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2498 struct nfs4_stateowner *op;
2499
2500 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2501 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2502 return op;
2503 }
2504 return NULL;
2505}
2506
2507/*
2508 * Alloc a lock owner structure.
2509 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2510 * occured.
2511 *
2512 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2513 */
2514
2515static struct nfs4_stateowner *
2516alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2517 struct nfs4_stateowner *sop;
2518 struct nfs4_replay *rp;
2519 unsigned int idhashval;
2520
2521 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2522 return NULL;
2523 idhashval = lockownerid_hashval(current_ownerid);
2524 INIT_LIST_HEAD(&sop->so_idhash);
2525 INIT_LIST_HEAD(&sop->so_strhash);
2526 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2527 INIT_LIST_HEAD(&sop->so_stateids);
2528 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2529 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2530 sop->so_time = 0;
2531 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2532 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2533 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2534 sop->so_is_open_owner = 0;
2535 sop->so_id = current_ownerid++;
2536 sop->so_client = clp;
b59e3c0e
NB		 2537 /* It is the openowner seqid that will be incremented in encode in the
2538 * case of new lockowners; so increment the lock seqid manually: */
2539 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2540 sop->so_confirmed = 1;
2541 rp = &sop->so_replay;
de1ae286 2542 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2543 rp->rp_buflen = 0;
2544 rp->rp_buf = rp->rp_ibuf;
2545 return sop;
2546}
2547
fd39ca9a 2548static struct nfs4_stateid *
1da177e4
LT		 2549alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2550{
2551 struct nfs4_stateid *stp;
2552 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2553
5ac049ac
N		 2554 stp = nfs4_alloc_stateid();
2555 if (stp == NULL)
1da177e4
LT		 2556 goto out;
2557 INIT_LIST_HEAD(&stp->st_hash);
2558 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2559 INIT_LIST_HEAD(&stp->st_perstateowner);
2560 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2561 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2562 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2563 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2564 stp->st_stateowner = sop;
13cd2184 2565 get_nfs4_file(fp);
1da177e4
LT		 2566 stp->st_file = fp;
2567 stp->st_stateid.si_boot = boot_time;
2568 stp->st_stateid.si_stateownerid = sop->so_id;
2569 stp->st_stateid.si_fileid = fp->fi_id;
2570 stp->st_stateid.si_generation = 0;
2571 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2572 stp->st_access_bmap = open_stp->st_access_bmap;
2573 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2574 stp->st_openstp = open_stp;
1da177e4
LT		 2575
2576out:
2577 return stp;
2578}
2579
fd39ca9a 2580static int
1da177e4
LT		 2581check_lock_length(u64 offset, u64 length)
2582{
2583 return ((length == 0) || ((length != ~(u64)0) &&
2584 LOFF_OVERFLOW(offset, length)));
2585}
2586
2587/*
2588 * LOCK operation
2589 */
b37ad28b 2590__be32
ca364317 2591nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2592 struct nfsd4_lock *lock)
1da177e4 2593{
3e9e3dbe 2594 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2595 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2596 struct nfs4_stateid *lock_stp;
2597 struct file *filp;
2598 struct file_lock file_lock;
8dc7c311 2599 struct file_lock conflock;
b37ad28b 2600 __be32 status = 0;
1da177e4 2601 unsigned int strhashval;
150b3934 2602 unsigned int cmd;
b8dd7b9a 2603 int err;
1da177e4
LT		 2604
2605 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2606 (long long) lock->lk_offset,
2607 (long long) lock->lk_length);
2608
1da177e4
LT		 2609 if (check_lock_length(lock->lk_offset, lock->lk_length))
2610 return nfserr_inval;
2611
ca364317
BF		 2612 if ((status = fh_verify(rqstp, &cstate->current_fh,
2613 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2614 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2615 return status;
2616 }
2617
1da177e4
LT		 2618 nfs4_lock_state();
2619
2620 if (lock->lk_is_new) {
893f8770
N		 2621 /*
2622 * Client indicates that this is a new lockowner.
2623 * Use open owner and open stateid to create lock owner and
2624 * lock stateid.
2625 */
1da177e4
LT		 2626 struct nfs4_stateid *open_stp = NULL;
2627 struct nfs4_file *fp;
2628
2629 status = nfserr_stale_clientid;
849823c5 2630 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2631 goto out;
1da177e4 2632
1da177e4 2633 /* validate and update open stateid and open seqid */
ca364317 2634 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2635 lock->lk_new_open_seqid,
2636 &lock->lk_new_open_stateid,
f3362737 2637 OPEN_STATE,
3a65588a 2638 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2639 lock);
37515177 2640 if (status)
1da177e4 2641 goto out;
3a65588a 2642 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2643 /* create lockowner and lock stateid */
2644 fp = open_stp->st_file;
2645 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2646 open_sop->so_client->cl_clientid.cl_id,
2647 &lock->v.new.owner);
3e9e3dbe
N		 2648 /* XXX: Do we need to check for duplicate stateowners on
2649 * the same file, or should they just be allowed (and
2650 * create new stateids)? */
1da177e4 2651 status = nfserr_resource;
b59e3c0e
NB		 2652 lock_sop = alloc_init_lock_stateowner(strhashval,
2653 open_sop->so_client, open_stp, lock);
2654 if (lock_sop == NULL)
1da177e4 2655 goto out;
b59e3c0e 2656 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2657 if (lock_stp == NULL)
1da177e4 2658 goto out;
1da177e4
LT		 2659 } else {
2660 /* lock (lock owner + lock stateid) already exists */
ca364317 2661 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2662 lock->lk_old_lock_seqid,
2663 &lock->lk_old_lock_stateid,
f3362737 2664 LOCK_STATE,
3a65588a 2665 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2666 if (status)
2667 goto out;
3a65588a 2668 lock_sop = lock->lk_replay_owner;
1da177e4 2669 }
3a65588a 2670 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2671 filp = lock_stp->st_vfs_file;
2672
0dd395dc
N		 2673 status = nfserr_grace;
2674 if (nfs4_in_grace() && !lock->lk_reclaim)
2675 goto out;
2676 status = nfserr_no_grace;
2677 if (!nfs4_in_grace() && lock->lk_reclaim)
2678 goto out;
2679
1da177e4
LT		 2680 locks_init_lock(&file_lock);
2681 switch (lock->lk_type) {
2682 case NFS4_READ_LT:
2683 case NFS4_READW_LT:
2684 file_lock.fl_type = F_RDLCK;
150b3934 2685 cmd = F_SETLK;
1da177e4
LT		 2686 break;
2687 case NFS4_WRITE_LT:
2688 case NFS4_WRITEW_LT:
2689 file_lock.fl_type = F_WRLCK;
150b3934 2690 cmd = F_SETLK;
1da177e4
LT		 2691 break;
2692 default:
2693 status = nfserr_inval;
2694 goto out;
2695 }
b59e3c0e 2696 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2697 file_lock.fl_pid = current->tgid;
2698 file_lock.fl_file = filp;
2699 file_lock.fl_flags = FL_POSIX;
d5b9026a 2700 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2701
2702 file_lock.fl_start = lock->lk_offset;
2703 if ((lock->lk_length == ~(u64)0) ||
2704 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2705 file_lock.fl_end = ~(u64)0;
2706 else
2707 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2708 nfs4_transform_lock_offset(&file_lock);
2709
2710 /*
2711 * Try to lock the file in the VFS.
2712 * Note: locks.c uses the BKL to protect the inode's lock list.
2713 */
2714
eb76b3fd
AA		 2715 /* XXX?: Just to divert the locks_release_private at the start of
2716 * locks_copy_lock: */
150b3934 2717 locks_init_lock(&conflock);
fd85b817 2718 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2719 switch (-err) {
1da177e4
LT		 2720 case 0: /* success! */
2721 update_stateid(&lock_stp->st_stateid);
2722 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2723 sizeof(stateid_t));
b8dd7b9a 2724 status = 0;
eb76b3fd
AA		 2725 break;
2726 case (EAGAIN): /* conflock holds conflicting lock */
2727 status = nfserr_denied;
2728 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2729 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2730 break;
1da177e4
LT		 2731 case (EDEADLK):
2732 status = nfserr_deadlock;
eb76b3fd 2733 break;
1da177e4 2734 default:
fd85b817 2735 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2736 status = nfserr_resource;
2737 break;
1da177e4 2738 }
1da177e4 2739out:
8a280510
BF		 2740 if (status && lock->lk_is_new && lock_sop)
2741 release_stateowner(lock_sop);
3a65588a
BF		 2742 if (lock->lk_replay_owner) {
2743 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2744 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2745 }
1da177e4
LT		 2746 nfs4_unlock_state();
2747 return status;
2748}
2749
2750/*
2751 * LOCKT operation
2752 */
b37ad28b 2753__be32
ca364317
BF		 2754nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2755 struct nfsd4_lockt *lockt)
1da177e4
LT		 2756{
2757 struct inode *inode;
2758 struct file file;
2759 struct file_lock file_lock;
fd85b817 2760 int error;
b37ad28b 2761 __be32 status;
1da177e4
LT		 2762
2763 if (nfs4_in_grace())
2764 return nfserr_grace;
2765
2766 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2767 return nfserr_inval;
2768
2769 lockt->lt_stateowner = NULL;
2770 nfs4_lock_state();
2771
2772 status = nfserr_stale_clientid;
849823c5 2773 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2774 goto out;
1da177e4 2775
ca364317 2776 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2777 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2778 if (status == nfserr_symlink)
2779 status = nfserr_inval;
2780 goto out;
2781 }
2782
ca364317 2783 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2784 locks_init_lock(&file_lock);
2785 switch (lockt->lt_type) {
2786 case NFS4_READ_LT:
2787 case NFS4_READW_LT:
2788 file_lock.fl_type = F_RDLCK;
2789 break;
2790 case NFS4_WRITE_LT:
2791 case NFS4_WRITEW_LT:
2792 file_lock.fl_type = F_WRLCK;
2793 break;
2794 default:
2fdada03 2795 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2796 status = nfserr_inval;
2797 goto out;
2798 }
2799
2800 lockt->lt_stateowner = find_lockstateowner_str(inode,
2801 &lockt->lt_clientid, &lockt->lt_owner);
2802 if (lockt->lt_stateowner)
2803 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2804 file_lock.fl_pid = current->tgid;
2805 file_lock.fl_flags = FL_POSIX;
d5b9026a 2806 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2807
2808 file_lock.fl_start = lockt->lt_offset;
2809 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2810 file_lock.fl_end = ~(u64)0;
2811 else
2812 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2813
2814 nfs4_transform_lock_offset(&file_lock);
2815
fd85b817 2816 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2817 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2818 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2819 * only the dentry:inode set.
2820 */
2821 memset(&file, 0, sizeof (struct file));
ca364317 2822 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2823
2824 status = nfs_ok;
fd85b817
ME		 2825 error = vfs_test_lock(&file, &file_lock);
2826 if (error) {
2827 status = nfserrno(error);
2828 goto out;
2829 }
9d6a8c5c 2830 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2831 status = nfserr_denied;
9d6a8c5c 2832 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2833 }
2834out:
2835 nfs4_unlock_state();
2836 return status;
2837}
2838
b37ad28b 2839__be32
ca364317 2840nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2841 struct nfsd4_locku *locku)
1da177e4
LT		 2842{
2843 struct nfs4_stateid *stp;
2844 struct file *filp = NULL;
2845 struct file_lock file_lock;
b37ad28b 2846 __be32 status;
b8dd7b9a 2847 int err;
1da177e4
LT		 2848
2849 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2850 (long long) locku->lu_offset,
2851 (long long) locku->lu_length);
2852
2853 if (check_lock_length(locku->lu_offset, locku->lu_length))
2854 return nfserr_inval;
2855
2856 nfs4_lock_state();
2857
ca364317 2858 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2859 locku->lu_seqid,
2860 &locku->lu_stateid,
f3362737 2861 LOCK_STATE,
1da177e4
LT		 2862 &locku->lu_stateowner, &stp, NULL)))
2863 goto out;
2864
2865 filp = stp->st_vfs_file;
2866 BUG_ON(!filp);
2867 locks_init_lock(&file_lock);
2868 file_lock.fl_type = F_UNLCK;
2869 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2870 file_lock.fl_pid = current->tgid;
2871 file_lock.fl_file = filp;
2872 file_lock.fl_flags = FL_POSIX;
d5b9026a 2873 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2874 file_lock.fl_start = locku->lu_offset;
2875
2876 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2877 file_lock.fl_end = ~(u64)0;
2878 else
2879 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2880 nfs4_transform_lock_offset(&file_lock);
2881
2882 /*
2883 * Try to unlock the file in the VFS.
2884 */
fd85b817 2885 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2886 if (err) {
fd85b817 2887 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2888 goto out_nfserr;
2889 }
2890 /*
2891 * OK, unlock succeeded; the only thing left to do is update the stateid.
2892 */
2893 update_stateid(&stp->st_stateid);
2894 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2895
2896out:
f2327d9a 2897 if (locku->lu_stateowner) {
1da177e4 2898 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2899 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2900 }
1da177e4
LT		 2901 nfs4_unlock_state();
2902 return status;
2903
2904out_nfserr:
b8dd7b9a 2905 status = nfserrno(err);
1da177e4
LT		 2906 goto out;
2907}
2908
2909/*
2910 * returns
2911 * 1: locks held by lockowner
2912 * 0: no locks held by lockowner
2913 */
2914static int
2915check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2916{
2917 struct file_lock **flpp;
7eaa36e2 2918 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2919 int status = 0;
2920
2921 lock_kernel();
2922 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2923 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2924 status = 1;
2925 goto out;
796dadfd 2926 }
1da177e4
LT		 2927 }
2928out:
2929 unlock_kernel();
2930 return status;
2931}
2932
b37ad28b 2933__be32
b591480b
BF		 2934nfsd4_release_lockowner(struct svc_rqst *rqstp,
2935 struct nfsd4_compound_state *cstate,
2936 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2937{
2938 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2939 struct nfs4_stateowner *sop;
2940 struct nfs4_stateid *stp;
1da177e4 2941 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2942 struct list_head matches;
2943 int i;
b37ad28b 2944 __be32 status;
1da177e4
LT		 2945
2946 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2947 clid->cl_boot, clid->cl_id);
2948
2949 /* XXX check for lease expiration */
2950
2951 status = nfserr_stale_clientid;
849823c5 2952 if (STALE_CLIENTID(clid))
1da177e4 2953 return status;
1da177e4
LT		 2954
2955 nfs4_lock_state();
2956
3e9e3dbe
N		 2957 status = nfserr_locks_held;
2958 /* XXX: we're doing a linear search through all the lockowners.
2959 * Yipes! For now we'll just hope clients aren't really using
2960 * release_lockowner much, but eventually we have to fix these
2961 * data structures. */
2962 INIT_LIST_HEAD(&matches);
2963 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2964 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 2965 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 2966 continue;
2967 list_for_each_entry(stp, &sop->so_stateids,
2968 st_perstateowner) {
2969 if (check_for_locks(stp->st_vfs_file, sop))
2970 goto out;
2971 /* Note: so_perclient unused for lockowners,
2972 * so it's OK to fool with here. */
2973 list_add(&sop->so_perclient, &matches);
2974 }
1da177e4 2975 }
3e9e3dbe
N		 2976 }
2977 /* Clients probably won't expect us to return with some (but not all)
2978 * of the lockowner state released; so don't release any until all
2979 * have been checked. */
2980 status = nfs_ok;
0fa822e4
N		 2981 while (!list_empty(&matches)) {
2982 sop = list_entry(matches.next, struct nfs4_stateowner,
2983 so_perclient);
2984 /* unhash_stateowner deletes so_perclient only
2985 * for openowners. */
2986 list_del(&sop->so_perclient);
3e9e3dbe 2987 release_stateowner(sop);
1da177e4
LT		 2988 }
2989out:
2990 nfs4_unlock_state();
2991 return status;
2992}
2993
2994static inline struct nfs4_client_reclaim *
a55370a3 2995alloc_reclaim(void)
1da177e4 2996{
a55370a3 2997 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 2998}
2999
c7b9a459
N		 3000int
3001nfs4_has_reclaimed_state(const char *name)
3002{
3003 unsigned int strhashval = clientstr_hashval(name);
3004 struct nfs4_client *clp;
3005
3006 clp = find_confirmed_client_by_str(name, strhashval);
3007 return clp ? 1 : 0;
3008}
3009
1da177e4
LT		 3010/*
3011 * failure => all reset bets are off, nfserr_no_grace...
3012 */
190e4fbf
N		 3013int
3014nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3015{
3016 unsigned int strhashval;
3017 struct nfs4_client_reclaim *crp = NULL;
3018
a55370a3
N		 3019 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3020 crp = alloc_reclaim();
1da177e4
LT		 3021 if (!crp)
3022 return 0;
a55370a3 3023 strhashval = clientstr_hashval(name);
1da177e4
LT		 3024 INIT_LIST_HEAD(&crp->cr_strhash);
3025 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3026 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3027 reclaim_str_hashtbl_size++;
3028 return 1;
3029}
3030
3031static void
3032nfs4_release_reclaim(void)
3033{
3034 struct nfs4_client_reclaim *crp = NULL;
3035 int i;
3036
1da177e4
LT		 3037 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3038 while (!list_empty(&reclaim_str_hashtbl[i])) {
3039 crp = list_entry(reclaim_str_hashtbl[i].next,
3040 struct nfs4_client_reclaim, cr_strhash);
3041 list_del(&crp->cr_strhash);
1da177e4
LT		 3042 kfree(crp);
3043 reclaim_str_hashtbl_size--;
3044 }
3045 }
3046 BUG_ON(reclaim_str_hashtbl_size);
3047}
3048
3049/*
3050 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3051static struct nfs4_client_reclaim *
1da177e4
LT		 3052nfs4_find_reclaim_client(clientid_t *clid)
3053{
3054 unsigned int strhashval;
3055 struct nfs4_client *clp;
3056 struct nfs4_client_reclaim *crp = NULL;
3057
3058
3059 /* find clientid in conf_id_hashtbl */
3060 clp = find_confirmed_client(clid);
3061 if (clp == NULL)
3062 return NULL;
3063
a55370a3
N		 3064 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3065 clp->cl_name.len, clp->cl_name.data,
3066 clp->cl_recdir);
1da177e4
LT		 3067
3068 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3069 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3070 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3071 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3072 return crp;
3073 }
3074 }
3075 return NULL;
3076}
3077
3078/*
3079* Called from OPEN. Look for clientid in reclaim list.
3080*/
b37ad28b 3081__be32
1da177e4
LT		 3082nfs4_check_open_reclaim(clientid_t *clid)
3083{
dfc83565 3084 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3085}
3086
ac4d8ff2 3087/* initialization to perform at module load time: */
1da177e4 3088
e8ff2a84 3089int
ac4d8ff2 3090nfs4_state_init(void)
1da177e4 3091{
e8ff2a84 3092 int i, status;
1da177e4 3093
e8ff2a84
BF		 3094 status = nfsd4_init_slabs();
3095 if (status)
3096 return status;
1da177e4
LT		 3097 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3098 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3099 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3100 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3101 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3102 }
3103 for (i = 0; i < FILE_HASH_SIZE; i++) {
3104 INIT_LIST_HEAD(&file_hashtbl[i]);
3105 }
3106 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3107 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3108 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3109 }
3110 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3111 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3112 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3113 }
3114 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3115 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3116 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3117 }
1da177e4 3118 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3119 INIT_LIST_HEAD(&close_lru);
3120 INIT_LIST_HEAD(&client_lru);
3121 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3122 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3123 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3124 reclaim_str_hashtbl_size = 0;
e8ff2a84 3125 return 0;
ac4d8ff2
N		 3126}
3127
190e4fbf
N		 3128static void
3129nfsd4_load_reboot_recovery_data(void)
3130{
3131 int status;
3132
0964a3d3
N		 3133 nfs4_lock_state();
3134 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3135 status = nfsd4_recdir_load();
0964a3d3 3136 nfs4_unlock_state();
190e4fbf
N		 3137 if (status)
3138 printk("NFSD: Failure reading reboot recovery data\n");
3139}
3140
9a8db97e
ME		 3141unsigned long
3142get_nfs4_grace_period(void)
3143{
3144 return max(user_lease_time, lease_time) * HZ;
3145}
3146
c2f1a551
MS		 3147/*
3148 * Since the lifetime of a delegation isn't limited to that of an open, a
3149 * client may quite reasonably hang on to a delegation as long as it has
3150 * the inode cached. This becomes an obvious problem the first time a
3151 * client's inode cache approaches the size of the server's total memory.
3152 *
3153 * For now we avoid this problem by imposing a hard limit on the number
3154 * of delegations, which varies according to the server's memory size.
3155 */
3156static void
3157set_max_delegations(void)
3158{
3159 /*
3160 * Allow at most 4 delegations per megabyte of RAM. Quick
3161 * estimates suggest that in the worst case (where every delegation
3162 * is for a different inode), a delegation could take about 1.5K,
3163 * giving a worst case usage of about 6% of memory.
3164 */
3165 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3166}
3167
ac4d8ff2
N		 3168/* initialization to perform when the nfsd service is started: */
3169
3170static void
3171__nfs4_state_start(void)
3172{
9a8db97e 3173 unsigned long grace_time;
ac4d8ff2 3174
1da177e4 3175 boot_time = get_seconds();
9a8db97e 3176 grace_time = get_nfs_grace_period();
d99a05ad 3177 lease_time = user_lease_time;
a76b4319 3178 in_grace = 1;
9a8db97e
ME		 3179 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3180 grace_time/HZ);
58da282b 3181 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3182 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3183 set_max_delegations();
1da177e4
LT		 3184}
3185
e8ff2a84 3186void
76a3550e 3187nfs4_state_start(void)
1da177e4 3188{
1da177e4 3189 if (nfs4_init)
e8ff2a84 3190 return;
190e4fbf 3191 nfsd4_load_reboot_recovery_data();
76a3550e 3192 __nfs4_state_start();
1da177e4 3193 nfs4_init = 1;
e8ff2a84 3194 return;
1da177e4
LT		 3195}
3196
3197int
3198nfs4_in_grace(void)
3199{
a76b4319 3200 return in_grace;
1da177e4
LT		 3201}
3202
3203time_t
3204nfs4_lease_time(void)
3205{
3206 return lease_time;
3207}
3208
3209static void
3210__nfs4_state_shutdown(void)
3211{
3212 int i;
3213 struct nfs4_client *clp = NULL;
3214 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3215 struct list_head *pos, *next, reaplist;
3216
1da177e4
LT		 3217 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3218 while (!list_empty(&conf_id_hashtbl[i])) {
3219 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3220 expire_client(clp);
3221 }
3222 while (!list_empty(&unconf_str_hashtbl[i])) {
3223 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3224 expire_client(clp);
3225 }
3226 }
3227 INIT_LIST_HEAD(&reaplist);
3228 spin_lock(&recall_lock);
3229 list_for_each_safe(pos, next, &del_recall_lru) {
3230 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3231 list_move(&dp->dl_recall_lru, &reaplist);
3232 }
3233 spin_unlock(&recall_lock);
3234 list_for_each_safe(pos, next, &reaplist) {
3235 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3236 list_del_init(&dp->dl_recall_lru);
3237 unhash_delegation(dp);
3238 }
3239
190e4fbf 3240 nfsd4_shutdown_recdir();
1da177e4 3241 nfs4_init = 0;
1da177e4
LT		 3242}
3243
3244void
3245nfs4_state_shutdown(void)
3246{
5e8d5c29
N		 3247 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3248 destroy_workqueue(laundry_wq);
1da177e4
LT		 3249 nfs4_lock_state();
3250 nfs4_release_reclaim();
3251 __nfs4_state_shutdown();
1da177e4
LT		 3252 nfs4_unlock_state();
3253}
3254
0964a3d3
N		 3255static void
3256nfs4_set_recdir(char *recdir)
3257{
3258 nfs4_lock_state();
3259 strcpy(user_recovery_dirname, recdir);
3260 nfs4_unlock_state();
3261}
3262
3263/*
3264 * Change the NFSv4 recovery directory to recdir.
3265 */
3266int
3267nfs4_reset_recoverydir(char *recdir)
3268{
3269 int status;
3270 struct nameidata nd;
3271
3272 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3273 if (status)
3274 return status;
3275 status = -ENOTDIR;
4ac91378 3276 if (S_ISDIR(nd.path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3277 nfs4_set_recdir(recdir);
3278 status = 0;
3279 }
1d957f9b 3280 path_put(&nd.path);
0964a3d3
N		 3281 return status;
3282}
3283
1da177e4
LT		 3284/*
3285 * Called when leasetime is changed.
3286 *
d99a05ad
N		 3287 * The only way the protocol gives us to handle on-the-fly lease changes is to
3288 * simulate a reboot. Instead of doing that, we just wait till the next time
3289 * we start to register any changes in lease time. If the administrator
3290 * really wants to change the lease time *now*, they can go ahead and bring
3291 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3292 */
3293void
3294nfs4_reset_lease(time_t leasetime)
3295{
d99a05ad
N		 3296 lock_kernel();
3297 user_lease_time = leasetime;
3298 unlock_kernel();
1da177e4 3299}
Linux 6.x block layer and io_uring tree(s)