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[net-next-2.6.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>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
0964a3d3 51#include <linux/namei.h>
c2f1a551 52#include <linux/swap.h>
353ab6e9 53#include <linux/mutex.h>
fd85b817 54#include <linux/lockd/bind.h>
9a8db97e 55#include <linux/module.h>
1da177e4
LT		 56
57#define NFSDDBG_FACILITY NFSDDBG_PROC
58
59/* Globals */
60static time_t lease_time = 90; /* default lease time */
d99a05ad 61static time_t user_lease_time = 90;
fd39ca9a 62static time_t boot_time;
a76b4319 63static int in_grace = 1;
1da177e4
LT		 64static u32 current_clientid = 1;
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 */
343static inline struct nfs4_client *
344alloc_client(struct xdr_netobj name)
345{
346 struct nfs4_client *clp;
347
f8314dc6 348 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
1da177e4
LT		 349 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
350 memcpy(clp->cl_name.data, name.data, name.len);
351 clp->cl_name.len = name.len;
352 }
353 else {
354 kfree(clp);
355 clp = NULL;
356 }
357 }
358 return clp;
359}
360
361static inline void
362free_client(struct nfs4_client *clp)
363{
364 if (clp->cl_cred.cr_group_info)
365 put_group_info(clp->cl_cred.cr_group_info);
366 kfree(clp->cl_name.data);
367 kfree(clp);
368}
369
370void
371put_nfs4_client(struct nfs4_client *clp)
372{
373 if (atomic_dec_and_test(&clp->cl_count))
374 free_client(clp);
375}
376
4e2fd495
N		 377static void
378shutdown_callback_client(struct nfs4_client *clp)
379{
380 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
381
382 /* shutdown rpc client, ending any outstanding recall rpcs */
383 if (clnt) {
384 clp->cl_callback.cb_client = NULL;
385 rpc_shutdown_client(clnt);
4e2fd495
N		 386 }
387}
388
1da177e4
LT		 389static void
390expire_client(struct nfs4_client *clp)
391{
392 struct nfs4_stateowner *sop;
393 struct nfs4_delegation *dp;
1da177e4
LT		 394 struct list_head reaplist;
395
396 dprintk("NFSD: expire_client cl_count %d\n",
397 atomic_read(&clp->cl_count));
398
4e2fd495 399 shutdown_callback_client(clp);
1da177e4
LT		 400
401 INIT_LIST_HEAD(&reaplist);
402 spin_lock(&recall_lock);
ea1da636
N		 403 while (!list_empty(&clp->cl_delegations)) {
404 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 405 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
406 dp->dl_flock);
ea1da636 407 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 408 list_move(&dp->dl_recall_lru, &reaplist);
409 }
410 spin_unlock(&recall_lock);
411 while (!list_empty(&reaplist)) {
412 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
413 list_del_init(&dp->dl_recall_lru);
414 unhash_delegation(dp);
415 }
416 list_del(&clp->cl_idhash);
417 list_del(&clp->cl_strhash);
418 list_del(&clp->cl_lru);
ea1da636
N		 419 while (!list_empty(&clp->cl_openowners)) {
420 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 421 release_stateowner(sop);
422 }
423 put_nfs4_client(clp);
424}
425
426static struct nfs4_client *
a55370a3 427create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 428 struct nfs4_client *clp;
429
430 if (!(clp = alloc_client(name)))
431 goto out;
a55370a3 432 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 433 atomic_set(&clp->cl_count, 1);
434 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 435 INIT_LIST_HEAD(&clp->cl_idhash);
436 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 437 INIT_LIST_HEAD(&clp->cl_openowners);
438 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 439 INIT_LIST_HEAD(&clp->cl_lru);
440out:
441 return clp;
442}
443
444static void
445copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
446 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
447}
448
449static void
450copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
451 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
452 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
453}
454
455static void
456copy_cred(struct svc_cred *target, struct svc_cred *source) {
457
458 target->cr_uid = source->cr_uid;
459 target->cr_gid = source->cr_gid;
460 target->cr_group_info = source->cr_group_info;
461 get_group_info(target->cr_group_info);
462}
463
a55370a3
N		 464static inline int
465same_name(const char *n1, const char *n2) {
466 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 467}
468
469static int
470cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
471 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
472}
473
474static int
475cmp_clid(clientid_t * cl1, clientid_t * cl2) {
476 return((cl1->cl_boot == cl2->cl_boot) &&
477 (cl1->cl_id == cl2->cl_id));
478}
479
480/* XXX what about NGROUP */
481static int
482cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
483 return(cr1->cr_uid == cr2->cr_uid);
484
485}
486
487static void
488gen_clid(struct nfs4_client *clp) {
489 clp->cl_clientid.cl_boot = boot_time;
490 clp->cl_clientid.cl_id = current_clientid++;
491}
492
493static void
494gen_confirm(struct nfs4_client *clp) {
495 struct timespec tv;
496 u32 * p;
497
498 tv = CURRENT_TIME;
499 p = (u32 *)clp->cl_confirm.data;
500 *p++ = tv.tv_sec;
501 *p++ = tv.tv_nsec;
502}
503
504static int
505check_name(struct xdr_netobj name) {
506
507 if (name.len == 0)
508 return 0;
509 if (name.len > NFS4_OPAQUE_LIMIT) {
510 printk("NFSD: check_name: name too long(%d)!\n", name.len);
511 return 0;
512 }
513 return 1;
514}
515
fd39ca9a 516static void
1da177e4
LT		 517add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
518{
519 unsigned int idhashval;
520
521 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
522 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
523 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
524 list_add_tail(&clp->cl_lru, &client_lru);
525 clp->cl_time = get_seconds();
526}
527
fd39ca9a 528static void
1da177e4
LT		 529move_to_confirmed(struct nfs4_client *clp)
530{
531 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
532 unsigned int strhashval;
533
534 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
535 list_del_init(&clp->cl_strhash);
f116629d 536 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 537 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 538 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
539 renew_client(clp);
540}
541
542static struct nfs4_client *
543find_confirmed_client(clientid_t *clid)
544{
545 struct nfs4_client *clp;
546 unsigned int idhashval = clientid_hashval(clid->cl_id);
547
548 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
549 if (cmp_clid(&clp->cl_clientid, clid))
550 return clp;
551 }
552 return NULL;
553}
554
555static struct nfs4_client *
556find_unconfirmed_client(clientid_t *clid)
557{
558 struct nfs4_client *clp;
559 unsigned int idhashval = clientid_hashval(clid->cl_id);
560
561 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
562 if (cmp_clid(&clp->cl_clientid, clid))
563 return clp;
564 }
565 return NULL;
566}
567
28ce6054
N		 568static struct nfs4_client *
569find_confirmed_client_by_str(const char *dname, unsigned int hashval)
570{
571 struct nfs4_client *clp;
572
573 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
574 if (same_name(clp->cl_recdir, dname))
575 return clp;
576 }
577 return NULL;
578}
579
580static struct nfs4_client *
581find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
582{
583 struct nfs4_client *clp;
584
585 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
586 if (same_name(clp->cl_recdir, dname))
587 return clp;
588 }
589 return NULL;
590}
591
1da177e4
LT		 592/* a helper function for parse_callback */
593static int
594parse_octet(unsigned int *lenp, char **addrp)
595{
596 unsigned int len = *lenp;
597 char *p = *addrp;
598 int n = -1;
599 char c;
600
601 for (;;) {
602 if (!len)
603 break;
604 len--;
605 c = *p++;
606 if (c == '.')
607 break;
608 if ((c < '0') || (c > '9')) {
609 n = -1;
610 break;
611 }
612 if (n < 0)
613 n = 0;
614 n = (n * 10) + (c - '0');
615 if (n > 255) {
616 n = -1;
617 break;
618 }
619 }
620 *lenp = len;
621 *addrp = p;
622 return n;
623}
624
625/* parse and set the setclientid ipv4 callback address */
fd39ca9a 626static int
1da177e4
LT		 627parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
628{
629 int temp = 0;
630 u32 cbaddr = 0;
631 u16 cbport = 0;
632 u32 addrlen = addr_len;
633 char *addr = addr_val;
634 int i, shift;
635
636 /* ipaddress */
637 shift = 24;
638 for(i = 4; i > 0 ; i--) {
639 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
640 return 0;
641 }
642 cbaddr |= (temp << shift);
643 if (shift > 0)
644 shift -= 8;
645 }
646 *cbaddrp = cbaddr;
647
648 /* port */
649 shift = 8;
650 for(i = 2; i > 0 ; i--) {
651 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
652 return 0;
653 }
654 cbport |= (temp << shift);
655 if (shift > 0)
656 shift -= 8;
657 }
658 *cbportp = cbport;
659 return 1;
660}
661
fd39ca9a 662static void
1da177e4
LT		 663gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
664{
665 struct nfs4_callback *cb = &clp->cl_callback;
666
667 /* Currently, we only support tcp for the callback channel */
668 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
669 goto out_err;
670
671 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
672 &cb->cb_addr, &cb->cb_port)))
673 goto out_err;
674 cb->cb_prog = se->se_callback_prog;
675 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 676 return;
677out_err:
849823c5 678 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 679 "will not receive delegations\n",
680 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
681
1da177e4
LT		 682 return;
683}
684
685/*
686 * RFC 3010 has a complex implmentation description of processing a
687 * SETCLIENTID request consisting of 5 bullets, labeled as
688 * CASE0 - CASE4 below.
689 *
690 * NOTES:
691 * callback information will be processed in a future patch
692 *
693 * an unconfirmed record is added when:
694 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
695 * CASE 1: confirmed record found with matching name, principal,
696 * verifier, and clientid.
697 * CASE 2: confirmed record found with matching name, principal,
698 * and there is no unconfirmed record with matching
699 * name and principal
700 *
701 * an unconfirmed record is replaced when:
702 * CASE 3: confirmed record found with matching name, principal,
703 * and an unconfirmed record is found with matching
704 * name, principal, and with clientid and
705 * confirm that does not match the confirmed record.
706 * CASE 4: there is no confirmed record with matching name and
707 * principal. there is an unconfirmed record with
708 * matching name, principal.
709 *
710 * an unconfirmed record is deleted when:
711 * CASE 1: an unconfirmed record that matches input name, verifier,
712 * and confirmed clientid.
713 * CASE 4: any unconfirmed records with matching name and principal
714 * that exist after an unconfirmed record has been replaced
715 * as described above.
716 *
717 */
b37ad28b 718__be32
b591480b
BF		 719nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
720 struct nfsd4_setclientid *setclid)
1da177e4 721{
27459f09 722 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 723 struct xdr_netobj clname = {
724 .len = setclid->se_namelen,
725 .data = setclid->se_name,
726 };
727 nfs4_verifier clverifier = setclid->se_verf;
728 unsigned int strhashval;
28ce6054 729 struct nfs4_client *conf, *unconf, *new;
b37ad28b 730 __be32 status;
a55370a3 731 char dname[HEXDIR_LEN];
1da177e4 732
1da177e4 733 if (!check_name(clname))
73aea4ec 734 return nfserr_inval;
1da177e4 735
a55370a3
N		 736 status = nfs4_make_rec_clidname(dname, &clname);
737 if (status)
73aea4ec 738 return status;
a55370a3 739
1da177e4
LT		 740 /*
741 * XXX The Duplicate Request Cache (DRC) has been checked (??)
742 * We get here on a DRC miss.
743 */
744
a55370a3 745 strhashval = clientstr_hashval(dname);
1da177e4 746
1da177e4 747 nfs4_lock_state();
28ce6054
N		 748 conf = find_confirmed_client_by_str(dname, strhashval);
749 if (conf) {
1da177e4
LT		 750 /*
751 * CASE 0:
752 * clname match, confirmed, different principal
753 * or different ip_address
754 */
755 status = nfserr_clid_inuse;
28ce6054 756 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 757 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 758 dprintk("NFSD: setclientid: string in use by client"
759 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 760 goto out;
761 }
1da177e4 762 }
28ce6054 763 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 764 status = nfserr_resource;
765 if (!conf) {
766 /*
767 * CASE 4:
768 * placed first, because it is the normal case.
769 */
770 if (unconf)
771 expire_client(unconf);
a55370a3
N		 772 new = create_client(clname, dname);
773 if (new == NULL)
1da177e4
LT		 774 goto out;
775 copy_verf(new, &clverifier);
27459f09 776 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 777 copy_cred(&new->cl_cred,&rqstp->rq_cred);
778 gen_clid(new);
779 gen_confirm(new);
780 gen_callback(new, setclid);
781 add_to_unconfirmed(new, strhashval);
782 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
783 /*
784 * CASE 1:
785 * cl_name match, confirmed, principal match
786 * verifier match: probable callback update
787 *
788 * remove any unconfirmed nfs4_client with
789 * matching cl_name, cl_verifier, and cl_clientid
790 *
791 * create and insert an unconfirmed nfs4_client with same
792 * cl_name, cl_verifier, and cl_clientid as existing
793 * nfs4_client, but with the new callback info and a
794 * new cl_confirm
795 */
31f4a6c1
N		 796 if (unconf) {
797 /* Note this is removing unconfirmed {*x***},
798 * which is stronger than RFC recommended {vxc**}.
799 * This has the advantage that there is at most
800 * one {*x***} in either list at any time.
801 */
802 expire_client(unconf);
1da177e4 803 }
a55370a3
N		 804 new = create_client(clname, dname);
805 if (new == NULL)
1da177e4
LT		 806 goto out;
807 copy_verf(new,&conf->cl_verifier);
27459f09 808 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 809 copy_cred(&new->cl_cred,&rqstp->rq_cred);
810 copy_clid(new, conf);
811 gen_confirm(new);
812 gen_callback(new, setclid);
813 add_to_unconfirmed(new,strhashval);
814 } else if (!unconf) {
815 /*
816 * CASE 2:
817 * clname match, confirmed, principal match
818 * verfier does not match
819 * no unconfirmed. create a new unconfirmed nfs4_client
820 * using input clverifier, clname, and callback info
821 * and generate a new cl_clientid and cl_confirm.
822 */
a55370a3
N		 823 new = create_client(clname, dname);
824 if (new == NULL)
1da177e4
LT		 825 goto out;
826 copy_verf(new,&clverifier);
27459f09 827 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 828 copy_cred(&new->cl_cred,&rqstp->rq_cred);
829 gen_clid(new);
830 gen_confirm(new);
831 gen_callback(new, setclid);
832 add_to_unconfirmed(new, strhashval);
833 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
834 /*
835 * CASE3:
836 * confirmed found (name, principal match)
837 * confirmed verifier does not match input clverifier
838 *
839 * unconfirmed found (name match)
840 * confirmed->cl_confirm != unconfirmed->cl_confirm
841 *
842 * remove unconfirmed.
843 *
844 * create an unconfirmed nfs4_client
845 * with same cl_name as existing confirmed nfs4_client,
846 * but with new callback info, new cl_clientid,
847 * new cl_verifier and a new cl_confirm
848 */
849 expire_client(unconf);
a55370a3
N		 850 new = create_client(clname, dname);
851 if (new == NULL)
1da177e4
LT		 852 goto out;
853 copy_verf(new,&clverifier);
27459f09 854 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 855 copy_cred(&new->cl_cred,&rqstp->rq_cred);
856 gen_clid(new);
857 gen_confirm(new);
858 gen_callback(new, setclid);
859 add_to_unconfirmed(new, strhashval);
860 } else {
861 /* No cases hit !!! */
862 status = nfserr_inval;
863 goto out;
864
865 }
866 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
867 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
868 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
869 status = nfs_ok;
870out:
871 nfs4_unlock_state();
872 return status;
873}
874
875
876/*
877 * RFC 3010 has a complex implmentation description of processing a
878 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
879 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
880 *
881 * NOTE: callback information will be processed here in a future patch
882 */
b37ad28b 883__be32
b591480b
BF		 884nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
885 struct nfsd4_compound_state *cstate,
886 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 887{
27459f09 888 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 889 struct nfs4_client *conf, *unconf;
1da177e4
LT		 890 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
891 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 892 __be32 status;
1da177e4
LT		 893
894 if (STALE_CLIENTID(clid))
895 return nfserr_stale_clientid;
896 /*
897 * XXX The Duplicate Request Cache (DRC) has been checked (??)
898 * We get here on a DRC miss.
899 */
900
901 nfs4_lock_state();
21ab45a4
N		 902
903 conf = find_confirmed_client(clid);
904 unconf = find_unconfirmed_client(clid);
905
906 status = nfserr_clid_inuse;
27459f09 907 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 908 goto out;
27459f09 909 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 910 goto out;
911
1da177e4
LT		 912 if ((conf && unconf) &&
913 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
914 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 915 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 916 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 917 /* CASE 1:
918 * unconf record that matches input clientid and input confirm.
919 * conf record that matches input clientid.
920 * conf and unconf records match names, verifiers
921 */
1da177e4
LT		 922 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
923 status = nfserr_clid_inuse;
924 else {
1a69c179
N		 925 /* XXX: We just turn off callbacks until we can handle
926 * change request correctly. */
cb36d634 927 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 928 gen_confirm(conf);
46309029 929 nfsd4_remove_clid_dir(unconf);
1a69c179 930 expire_client(unconf);
1da177e4 931 status = nfs_ok;
1a69c179 932
1da177e4 933 }
7c79f737 934 } else if ((conf && !unconf) ||
1da177e4
LT		 935 ((conf && unconf) &&
936 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 937 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 938 /* CASE 2:
939 * conf record that matches input clientid.
940 * if unconf record matches input clientid, then
941 * unconf->cl_name or unconf->cl_verifier don't match the
942 * conf record.
943 */
21ab45a4 944 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 945 status = nfserr_clid_inuse;
21ab45a4 946 else
1da177e4 947 status = nfs_ok;
7c79f737
N		 948 } else if (!conf && unconf
949 && cmp_verf(&unconf->cl_confirm, &confirm)) {
950 /* CASE 3:
951 * conf record not found.
952 * unconf record found.
953 * unconf->cl_confirm matches input confirm
954 */
1da177e4
LT		 955 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
956 status = nfserr_clid_inuse;
957 } else {
1a69c179
N		 958 unsigned int hash =
959 clientstr_hashval(unconf->cl_recdir);
960 conf = find_confirmed_client_by_str(unconf->cl_recdir,
961 hash);
962 if (conf) {
c7b9a459 963 nfsd4_remove_clid_dir(conf);
1a69c179
N		 964 expire_client(conf);
965 }
1da177e4 966 move_to_confirmed(unconf);
21ab45a4 967 conf = unconf;
1a69c179 968 status = nfs_ok;
1da177e4 969 }
7c79f737
N		 970 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
971 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
972 &confirm)))) {
973 /* CASE 4:
974 * conf record not found, or if conf, conf->cl_confirm does not
975 * match input confirm.
976 * unconf record not found, or if unconf, unconf->cl_confirm
977 * does not match input confirm.
978 */
1da177e4 979 status = nfserr_stale_clientid;
7c79f737 980 } else {
08e8987c
N		 981 /* check that we have hit one of the cases...*/
982 status = nfserr_clid_inuse;
983 }
1da177e4
LT		 984out:
985 if (!status)
21ab45a4 986 nfsd4_probe_callback(conf);
1da177e4
LT		 987 nfs4_unlock_state();
988 return status;
989}
990
1da177e4
LT		 991/* OPEN Share state helper functions */
992static inline struct nfs4_file *
993alloc_init_file(struct inode *ino)
994{
995 struct nfs4_file *fp;
996 unsigned int hashval = file_hashval(ino);
997
e60d4398
N		 998 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
999 if (fp) {
13cd2184 1000 kref_init(&fp->fi_ref);
1da177e4 1001 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1002 INIT_LIST_HEAD(&fp->fi_stateids);
1003 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1004 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1005 fp->fi_inode = igrab(ino);
1006 fp->fi_id = current_fileid++;
47f9940c 1007 fp->fi_had_conflict = false;
1da177e4
LT		 1008 return fp;
1009 }
1010 return NULL;
1011}
1012
e60d4398 1013static void
e18b890b 1014nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1015{
e60d4398
N		 1016 if (*slab == NULL)
1017 return;
1a1d92c1 1018 kmem_cache_destroy(*slab);
e60d4398 1019 *slab = NULL;
1da177e4
LT		 1020}
1021
1022static void
1023nfsd4_free_slabs(void)
1024{
e60d4398
N		 1025 nfsd4_free_slab(&stateowner_slab);
1026 nfsd4_free_slab(&file_slab);
5ac049ac 1027 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1028 nfsd4_free_slab(&deleg_slab);
e60d4398 1029}
1da177e4 1030
e60d4398
N		 1031static int
1032nfsd4_init_slabs(void)
1033{
1034 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1035 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1036 if (stateowner_slab == NULL)
1037 goto out_nomem;
1038 file_slab = kmem_cache_create("nfsd4_files",
1039 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1040 if (file_slab == NULL)
1041 goto out_nomem;
5ac049ac
N		 1042 stateid_slab = kmem_cache_create("nfsd4_stateids",
1043 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1044 if (stateid_slab == NULL)
1045 goto out_nomem;
5b2d21c1
N		 1046 deleg_slab = kmem_cache_create("nfsd4_delegations",
1047 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1048 if (deleg_slab == NULL)
1049 goto out_nomem;
e60d4398
N		 1050 return 0;
1051out_nomem:
1052 nfsd4_free_slabs();
1053 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1054 return -ENOMEM;
1da177e4
LT		 1055}
1056
1057void
1058nfs4_free_stateowner(struct kref *kref)
1059{
1060 struct nfs4_stateowner *sop =
1061 container_of(kref, struct nfs4_stateowner, so_ref);
1062 kfree(sop->so_owner.data);
1063 kmem_cache_free(stateowner_slab, sop);
1064}
1065
1066static inline struct nfs4_stateowner *
1067alloc_stateowner(struct xdr_netobj *owner)
1068{
1069 struct nfs4_stateowner *sop;
1070
1071 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1072 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1073 memcpy(sop->so_owner.data, owner->data, owner->len);
1074 sop->so_owner.len = owner->len;
1075 kref_init(&sop->so_ref);
1076 return sop;
1077 }
1078 kmem_cache_free(stateowner_slab, sop);
1079 }
1080 return NULL;
1081}
1082
1083static struct nfs4_stateowner *
1084alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1085 struct nfs4_stateowner *sop;
1086 struct nfs4_replay *rp;
1087 unsigned int idhashval;
1088
1089 if (!(sop = alloc_stateowner(&open->op_owner)))
1090 return NULL;
1091 idhashval = ownerid_hashval(current_ownerid);
1092 INIT_LIST_HEAD(&sop->so_idhash);
1093 INIT_LIST_HEAD(&sop->so_strhash);
1094 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1095 INIT_LIST_HEAD(&sop->so_stateids);
1096 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1097 INIT_LIST_HEAD(&sop->so_close_lru);
1098 sop->so_time = 0;
1099 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1100 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1101 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1102 sop->so_is_open_owner = 1;
1103 sop->so_id = current_ownerid++;
1104 sop->so_client = clp;
1105 sop->so_seqid = open->op_seqid;
1106 sop->so_confirmed = 0;
1107 rp = &sop->so_replay;
de1ae286 1108 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1109 rp->rp_buflen = 0;
1110 rp->rp_buf = rp->rp_ibuf;
1111 return sop;
1112}
1113
1114static void
1115release_stateid_lockowners(struct nfs4_stateid *open_stp)
1116{
1117 struct nfs4_stateowner *lock_sop;
1118
ea1da636
N		 1119 while (!list_empty(&open_stp->st_lockowners)) {
1120 lock_sop = list_entry(open_stp->st_lockowners.next,
1121 struct nfs4_stateowner, so_perstateid);
1122 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1123 BUG_ON(lock_sop->so_is_open_owner);
1124 release_stateowner(lock_sop);
1125 }
1126}
1127
1128static void
1129unhash_stateowner(struct nfs4_stateowner *sop)
1130{
1131 struct nfs4_stateid *stp;
1132
1133 list_del(&sop->so_idhash);
1134 list_del(&sop->so_strhash);
6fa305de 1135 if (sop->so_is_open_owner)
1da177e4 1136 list_del(&sop->so_perclient);
ea1da636
N		 1137 list_del(&sop->so_perstateid);
1138 while (!list_empty(&sop->so_stateids)) {
1139 stp = list_entry(sop->so_stateids.next,
1140 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1141 if (sop->so_is_open_owner)
1142 release_stateid(stp, OPEN_STATE);
1143 else
1144 release_stateid(stp, LOCK_STATE);
1145 }
1146}
1147
1148static void
1149release_stateowner(struct nfs4_stateowner *sop)
1150{
1151 unhash_stateowner(sop);
1152 list_del(&sop->so_close_lru);
1153 nfs4_put_stateowner(sop);
1154}
1155
1156static inline void
1157init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1158 struct nfs4_stateowner *sop = open->op_stateowner;
1159 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1160
1161 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1162 INIT_LIST_HEAD(&stp->st_perstateowner);
1163 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1164 INIT_LIST_HEAD(&stp->st_perfile);
1165 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1166 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1167 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1168 stp->st_stateowner = sop;
13cd2184 1169 get_nfs4_file(fp);
1da177e4
LT		 1170 stp->st_file = fp;
1171 stp->st_stateid.si_boot = boot_time;
1172 stp->st_stateid.si_stateownerid = sop->so_id;
1173 stp->st_stateid.si_fileid = fp->fi_id;
1174 stp->st_stateid.si_generation = 0;
1175 stp->st_access_bmap = 0;
1176 stp->st_deny_bmap = 0;
1177 __set_bit(open->op_share_access, &stp->st_access_bmap);
1178 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1179 stp->st_openstp = NULL;
1da177e4
LT		 1180}
1181
1182static void
1183release_stateid(struct nfs4_stateid *stp, int flags)
1184{
1185 struct file *filp = stp->st_vfs_file;
1186
1187 list_del(&stp->st_hash);
1da177e4 1188 list_del(&stp->st_perfile);
ea1da636 1189 list_del(&stp->st_perstateowner);
1da177e4
LT		 1190 if (flags & OPEN_STATE) {
1191 release_stateid_lockowners(stp);
1192 stp->st_vfs_file = NULL;
1193 nfsd_close(filp);
1da177e4
LT		 1194 } else if (flags & LOCK_STATE)
1195 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1196 put_nfs4_file(stp->st_file);
5ac049ac 1197 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1198}
1199
fd39ca9a 1200static void
1da177e4
LT		 1201move_to_close_lru(struct nfs4_stateowner *sop)
1202{
1203 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1204
358dd55a 1205 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1206 sop->so_time = get_seconds();
1207}
1208
1da177e4
LT		 1209static int
1210cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1211 return ((sop->so_owner.len == owner->len) &&
1212 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1213 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1214}
1215
1216static struct nfs4_stateowner *
1217find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1218{
1219 struct nfs4_stateowner *so = NULL;
1220
1221 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1222 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1223 return so;
1224 }
1225 return NULL;
1226}
1227
1228/* search file_hashtbl[] for file */
1229static struct nfs4_file *
1230find_file(struct inode *ino)
1231{
1232 unsigned int hashval = file_hashval(ino);
1233 struct nfs4_file *fp;
1234
1235 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1236 if (fp->fi_inode == ino) {
1237 get_nfs4_file(fp);
1da177e4 1238 return fp;
13cd2184 1239 }
1da177e4
LT		 1240 }
1241 return NULL;
1242}
1243
ba5a6a19
BF		 1244static int access_valid(u32 x)
1245{
1246 return (x > 0 && x < 4);
1247}
1248
1249static int deny_valid(u32 x)
1250{
1251 return (x >= 0 && x < 5);
1252}
1da177e4 1253
fd39ca9a 1254static void
1da177e4
LT		 1255set_access(unsigned int *access, unsigned long bmap) {
1256 int i;
1257
1258 *access = 0;
1259 for (i = 1; i < 4; i++) {
1260 if (test_bit(i, &bmap))
1261 *access |= i;
1262 }
1263}
1264
fd39ca9a 1265static void
1da177e4
LT		 1266set_deny(unsigned int *deny, unsigned long bmap) {
1267 int i;
1268
1269 *deny = 0;
1270 for (i = 0; i < 4; i++) {
1271 if (test_bit(i, &bmap))
1272 *deny |= i ;
1273 }
1274}
1275
1276static int
1277test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1278 unsigned int access, deny;
1279
1280 set_access(&access, stp->st_access_bmap);
1281 set_deny(&deny, stp->st_deny_bmap);
1282 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1283 return 0;
1284 return 1;
1285}
1286
1287/*
1288 * Called to check deny when READ with all zero stateid or
1289 * WRITE with all zero or all one stateid
1290 */
b37ad28b 1291static __be32
1da177e4
LT		 1292nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1293{
1294 struct inode *ino = current_fh->fh_dentry->d_inode;
1295 struct nfs4_file *fp;
1296 struct nfs4_stateid *stp;
b37ad28b 1297 __be32 ret;
1da177e4
LT		 1298
1299 dprintk("NFSD: nfs4_share_conflict\n");
1300
1301 fp = find_file(ino);
13cd2184
N		 1302 if (!fp)
1303 return nfs_ok;
b700949b 1304 ret = nfserr_locked;
1da177e4 1305 /* Search for conflicting share reservations */
13cd2184
N		 1306 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1307 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1308 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1309 goto out;
1da177e4 1310 }
13cd2184
N		 1311 ret = nfs_ok;
1312out:
1313 put_nfs4_file(fp);
1314 return ret;
1da177e4
LT		 1315}
1316
1317static inline void
1318nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1319{
1320 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1321 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1322 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1323 }
1324}
1325
1326/*
1327 * Recall a delegation
1328 */
1329static int
1330do_recall(void *__dp)
1331{
1332 struct nfs4_delegation *dp = __dp;
1333
47f9940c 1334 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1335 nfsd4_cb_recall(dp);
1336 return 0;
1337}
1338
1339/*
1340 * Spawn a thread to perform a recall on the delegation represented
1341 * by the lease (file_lock)
1342 *
1343 * Called from break_lease() with lock_kernel() held.
1344 * Note: we assume break_lease will only call this *once* for any given
1345 * lease.
1346 */
1347static
1348void nfsd_break_deleg_cb(struct file_lock *fl)
1349{
1350 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1351 struct task_struct *t;
1352
1353 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1354 if (!dp)
1355 return;
1356
1357 /* We're assuming the state code never drops its reference
1358 * without first removing the lease. Since we're in this lease
1359 * callback (and since the lease code is serialized by the kernel
1360 * lock) we know the server hasn't removed the lease yet, we know
1361 * it's safe to take a reference: */
1362 atomic_inc(&dp->dl_count);
1363
1364 spin_lock(&recall_lock);
1365 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1366 spin_unlock(&recall_lock);
1367
1368 /* only place dl_time is set. protected by lock_kernel*/
1369 dp->dl_time = get_seconds();
1370
1371 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1372 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1373
1374 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1375 if (IS_ERR(t)) {
1376 struct nfs4_client *clp = dp->dl_client;
1377
1378 printk(KERN_INFO "NFSD: Callback thread failed for "
1379 "for client (clientid %08x/%08x)\n",
1380 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1381 nfs4_put_delegation(dp);
1382 }
1383}
1384
1385/*
1386 * The file_lock is being reapd.
1387 *
1388 * Called by locks_free_lock() with lock_kernel() held.
1389 */
1390static
1391void nfsd_release_deleg_cb(struct file_lock *fl)
1392{
1393 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1394
1395 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1396
1397 if (!(fl->fl_flags & FL_LEASE) || !dp)
1398 return;
1399 dp->dl_flock = NULL;
1400}
1401
1402/*
1403 * Set the delegation file_lock back pointer.
1404 *
a9933cea 1405 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1406 */
1407static
1408void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1409{
1410 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1411
1412 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1413 if (!dp)
1414 return;
1415 dp->dl_flock = new;
1416}
1417
1418/*
a9933cea 1419 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1420 */
1421static
1422int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1423{
1424 struct nfs4_delegation *onlistd =
1425 (struct nfs4_delegation *)onlist->fl_owner;
1426 struct nfs4_delegation *tryd =
1427 (struct nfs4_delegation *)try->fl_owner;
1428
1429 if (onlist->fl_lmops != try->fl_lmops)
1430 return 0;
1431
1432 return onlistd->dl_client == tryd->dl_client;
1433}
1434
1435
1436static
1437int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1438{
1439 if (arg & F_UNLCK)
1440 return lease_modify(onlist, arg);
1441 else
1442 return -EAGAIN;
1443}
1444
fd39ca9a 1445static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1446 .fl_break = nfsd_break_deleg_cb,
1447 .fl_release_private = nfsd_release_deleg_cb,
1448 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1449 .fl_mylease = nfsd_same_client_deleg_cb,
1450 .fl_change = nfsd_change_deleg_cb,
1451};
1452
1453
b37ad28b 1454__be32
1da177e4
LT		 1455nfsd4_process_open1(struct nfsd4_open *open)
1456{
1da177e4
LT		 1457 clientid_t *clientid = &open->op_clientid;
1458 struct nfs4_client *clp = NULL;
1459 unsigned int strhashval;
1460 struct nfs4_stateowner *sop = NULL;
1461
1da177e4 1462 if (!check_name(open->op_owner))
0f442aa2 1463 return nfserr_inval;
1da177e4
LT		 1464
1465 if (STALE_CLIENTID(&open->op_clientid))
1466 return nfserr_stale_clientid;
1467
1468 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1469 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1470 open->op_stateowner = sop;
1471 if (!sop) {
1472 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1473 clp = find_confirmed_client(clientid);
1474 if (clp == NULL)
0f442aa2
BF		 1475 return nfserr_expired;
1476 goto renew;
1da177e4 1477 }
0f442aa2
BF		 1478 if (!sop->so_confirmed) {
1479 /* Replace unconfirmed owners without checking for replay. */
1480 clp = sop->so_client;
1481 release_stateowner(sop);
1482 open->op_stateowner = NULL;
1483 goto renew;
1484 }
1485 if (open->op_seqid == sop->so_seqid - 1) {
1486 if (sop->so_replay.rp_buflen)
a90b061c 1487 return nfserr_replay_me;
0f442aa2
BF		 1488 /* The original OPEN failed so spectacularly
1489 * that we don't even have replay data saved!
1490 * Therefore, we have no choice but to continue
1491 * processing this OPEN; presumably, we'll
1492 * fail again for the same reason.
1493 */
1494 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1495 goto renew;
1496 }
1497 if (open->op_seqid != sop->so_seqid)
1498 return nfserr_bad_seqid;
1da177e4 1499renew:
0f442aa2
BF		 1500 if (open->op_stateowner == NULL) {
1501 sop = alloc_init_open_stateowner(strhashval, clp, open);
1502 if (sop == NULL)
1503 return nfserr_resource;
1504 open->op_stateowner = sop;
1505 }
1506 list_del_init(&sop->so_close_lru);
1da177e4 1507 renew_client(sop->so_client);
0f442aa2 1508 return nfs_ok;
1da177e4
LT		 1509}
1510
b37ad28b 1511static inline __be32
4a6e43e6
N		 1512nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1513{
1514 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1515 return nfserr_openmode;
1516 else
1517 return nfs_ok;
1518}
1519
52f4fb43
N		 1520static struct nfs4_delegation *
1521find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1522{
1523 struct nfs4_delegation *dp;
1524
ea1da636 1525 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1526 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1527 return dp;
1528 }
1529 return NULL;
1530}
1531
b37ad28b 1532static __be32
567d9829
N		 1533nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1534 struct nfs4_delegation **dp)
1535{
1536 int flags;
b37ad28b 1537 __be32 status = nfserr_bad_stateid;
567d9829
N		 1538
1539 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1540 if (*dp == NULL)
c44c5eeb 1541 goto out;
567d9829
N		 1542 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1543 RD_STATE : WR_STATE;
1544 status = nfs4_check_delegmode(*dp, flags);
1545 if (status)
1546 *dp = NULL;
c44c5eeb
N		 1547out:
1548 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1549 return nfs_ok;
1550 if (status)
1551 return status;
1552 open->op_stateowner->so_confirmed = 1;
1553 return nfs_ok;
567d9829
N		 1554}
1555
b37ad28b 1556static __be32
1da177e4
LT		 1557nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1558{
1559 struct nfs4_stateid *local;
b37ad28b 1560 __be32 status = nfserr_share_denied;
1da177e4
LT		 1561 struct nfs4_stateowner *sop = open->op_stateowner;
1562
8beefa24 1563 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1564 /* ignore lock owners */
1565 if (local->st_stateowner->so_is_open_owner == 0)
1566 continue;
1567 /* remember if we have seen this open owner */
1568 if (local->st_stateowner == sop)
1569 *stpp = local;
1570 /* check for conflicting share reservations */
1571 if (!test_share(local, open))
1572 goto out;
1573 }
1574 status = 0;
1575out:
1576 return status;
1577}
1578
5ac049ac
N		 1579static inline struct nfs4_stateid *
1580nfs4_alloc_stateid(void)
1581{
1582 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1583}
1584
b37ad28b 1585static __be32
1da177e4 1586nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1587 struct nfs4_delegation *dp,
1da177e4
LT		 1588 struct svc_fh *cur_fh, int flags)
1589{
1590 struct nfs4_stateid *stp;
1da177e4 1591
5ac049ac 1592 stp = nfs4_alloc_stateid();
1da177e4
LT		 1593 if (stp == NULL)
1594 return nfserr_resource;
1595
567d9829
N		 1596 if (dp) {
1597 get_file(dp->dl_vfs_file);
1598 stp->st_vfs_file = dp->dl_vfs_file;
1599 } else {
b37ad28b 1600 __be32 status;
567d9829
N		 1601 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1602 &stp->st_vfs_file);
1603 if (status) {
1604 if (status == nfserr_dropit)
1605 status = nfserr_jukebox;
5ac049ac 1606 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1607 return status;
1608 }
1da177e4 1609 }
1da177e4
LT		 1610 *stpp = stp;
1611 return 0;
1612}
1613
b37ad28b 1614static inline __be32
1da177e4
LT		 1615nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1616 struct nfsd4_open *open)
1617{
1618 struct iattr iattr = {
1619 .ia_valid = ATTR_SIZE,
1620 .ia_size = 0,
1621 };
1622 if (!open->op_truncate)
1623 return 0;
1624 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1625 return nfserr_inval;
1da177e4
LT		 1626 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1627}
1628
b37ad28b 1629static __be32
1da177e4
LT		 1630nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1631{
1632 struct file *filp = stp->st_vfs_file;
7eaa36e2 1633 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1634 unsigned int share_access, new_writer;
b37ad28b 1635 __be32 status;
1da177e4
LT		 1636
1637 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1638 new_writer = (~share_access) & open->op_share_access
1639 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1640
6c26d08f 1641 if (new_writer) {
b37ad28b
AV		 1642 int err = get_write_access(inode);
1643 if (err)
1644 return nfserrno(err);
6c26d08f 1645 }
1da177e4
LT		 1646 status = nfsd4_truncate(rqstp, cur_fh, open);
1647 if (status) {
6c26d08f
BF		 1648 if (new_writer)
1649 put_write_access(inode);
1da177e4
LT		 1650 return status;
1651 }
1652 /* remember the open */
6c26d08f 1653 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1654 set_bit(open->op_share_access, &stp->st_access_bmap);
1655 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1656
1657 return nfs_ok;
1658}
1659
1660
1da177e4 1661static void
37515177 1662nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1663{
37515177
N		 1664 open->op_stateowner->so_confirmed = 1;
1665 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1666}
1667
1668/*
1669 * Attempt to hand out a delegation.
1670 */
1671static void
1672nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1673{
1674 struct nfs4_delegation *dp;
1675 struct nfs4_stateowner *sop = stp->st_stateowner;
1676 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1677 struct file_lock fl, *flp = &fl;
1678 int status, flag = 0;
1679
1680 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1681 open->op_recall = 0;
1682 switch (open->op_claim_type) {
1683 case NFS4_OPEN_CLAIM_PREVIOUS:
1684 if (!atomic_read(&cb->cb_set))
1685 open->op_recall = 1;
1686 flag = open->op_delegate_type;
1687 if (flag == NFS4_OPEN_DELEGATE_NONE)
1688 goto out;
1689 break;
1690 case NFS4_OPEN_CLAIM_NULL:
1691 /* Let's not give out any delegations till everyone's
1692 * had the chance to reclaim theirs.... */
1693 if (nfs4_in_grace())
1694 goto out;
1695 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1696 goto out;
1697 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1698 flag = NFS4_OPEN_DELEGATE_WRITE;
1699 else
1700 flag = NFS4_OPEN_DELEGATE_READ;
1701 break;
1702 default:
1703 goto out;
1704 }
1da177e4
LT		 1705
1706 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1707 if (dp == NULL) {
1708 flag = NFS4_OPEN_DELEGATE_NONE;
1709 goto out;
1710 }
1711 locks_init_lock(&fl);
1712 fl.fl_lmops = &nfsd_lease_mng_ops;
1713 fl.fl_flags = FL_LEASE;
1714 fl.fl_end = OFFSET_MAX;
1715 fl.fl_owner = (fl_owner_t)dp;
1716 fl.fl_file = stp->st_vfs_file;
1717 fl.fl_pid = current->tgid;
1718
a9933cea 1719 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1720 * the lock_manager callbacks fl_mylease and fl_change are used
1721 */
a9933cea 1722 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1723 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1724 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1725 unhash_delegation(dp);
1da177e4
LT		 1726 flag = NFS4_OPEN_DELEGATE_NONE;
1727 goto out;
1728 }
1729
1730 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1731
1732 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1733 dp->dl_stateid.si_boot,
1734 dp->dl_stateid.si_stateownerid,
1735 dp->dl_stateid.si_fileid,
1736 dp->dl_stateid.si_generation);
1737out:
7b190fec
N		 1738 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1739 && flag == NFS4_OPEN_DELEGATE_NONE
1740 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1741 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1742 open->op_delegate_type = flag;
1743}
1744
1745/*
1746 * called with nfs4_lock_state() held.
1747 */
b37ad28b 1748__be32
1da177e4
LT		 1749nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1750{
1751 struct nfs4_file *fp = NULL;
1752 struct inode *ino = current_fh->fh_dentry->d_inode;
1753 struct nfs4_stateid *stp = NULL;
567d9829 1754 struct nfs4_delegation *dp = NULL;
b37ad28b 1755 __be32 status;
1da177e4
LT		 1756
1757 status = nfserr_inval;
ba5a6a19
BF		 1758 if (!access_valid(open->op_share_access)
1759 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1760 goto out;
1761 /*
1762 * Lookup file; if found, lookup stateid and check open request,
1763 * and check for delegations in the process of being recalled.
1764 * If not found, create the nfs4_file struct
1765 */
1766 fp = find_file(ino);
1767 if (fp) {
1768 if ((status = nfs4_check_open(fp, open, &stp)))
1769 goto out;
c44c5eeb
N		 1770 status = nfs4_check_deleg(fp, open, &dp);
1771 if (status)
1772 goto out;
1da177e4 1773 } else {
c44c5eeb
N		 1774 status = nfserr_bad_stateid;
1775 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1776 goto out;
1da177e4
LT		 1777 status = nfserr_resource;
1778 fp = alloc_init_file(ino);
1779 if (fp == NULL)
1780 goto out;
1781 }
1782
1783 /*
1784 * OPEN the file, or upgrade an existing OPEN.
1785 * If truncate fails, the OPEN fails.
1786 */
1787 if (stp) {
1788 /* Stateid was found, this is an OPEN upgrade */
1789 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1790 if (status)
1791 goto out;
444c2c07 1792 update_stateid(&stp->st_stateid);
1da177e4
LT		 1793 } else {
1794 /* Stateid was not found, this is a new OPEN */
1795 int flags = 0;
9ecb6a08
BF		 1796 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1797 flags |= MAY_READ;
1da177e4 1798 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1799 flags |= MAY_WRITE;
567d9829
N		 1800 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1801 if (status)
1da177e4
LT		 1802 goto out;
1803 init_stateid(stp, fp, open);
1804 status = nfsd4_truncate(rqstp, current_fh, open);
1805 if (status) {
1806 release_stateid(stp, OPEN_STATE);
1807 goto out;
1808 }
1809 }
1810 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1811
1812 /*
1813 * Attempt to hand out a delegation. No error return, because the
1814 * OPEN succeeds even if we fail.
1815 */
1816 nfs4_open_delegation(current_fh, open, stp);
1817
1818 status = nfs_ok;
1819
1820 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1821 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1822 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1823out:
13cd2184
N		 1824 if (fp)
1825 put_nfs4_file(fp);
37515177
N		 1826 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1827 nfs4_set_claim_prev(open);
1da177e4
LT		 1828 /*
1829 * To finish the open response, we just need to set the rflags.
1830 */
1831 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1832 if (!open->op_stateowner->so_confirmed)
1833 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1834
1835 return status;
1836}
1837
58da282b 1838static struct workqueue_struct *laundry_wq;
c4028958
DH		 1839static void laundromat_main(struct work_struct *);
1840static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1841
b37ad28b 1842__be32
b591480b
BF		 1843nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1844 clientid_t *clid)
1da177e4
LT		 1845{
1846 struct nfs4_client *clp;
b37ad28b 1847 __be32 status;
1da177e4
LT		 1848
1849 nfs4_lock_state();
1850 dprintk("process_renew(%08x/%08x): starting\n",
1851 clid->cl_boot, clid->cl_id);
1852 status = nfserr_stale_clientid;
1853 if (STALE_CLIENTID(clid))
1854 goto out;
1855 clp = find_confirmed_client(clid);
1856 status = nfserr_expired;
1857 if (clp == NULL) {
1858 /* We assume the client took too long to RENEW. */
1859 dprintk("nfsd4_renew: clientid not found!\n");
1860 goto out;
1861 }
1862 renew_client(clp);
1863 status = nfserr_cb_path_down;
ea1da636 1864 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1865 && !atomic_read(&clp->cl_callback.cb_set))
1866 goto out;
1867 status = nfs_ok;
1868out:
1869 nfs4_unlock_state();
1870 return status;
1871}
1872
a76b4319
N		 1873static void
1874end_grace(void)
1875{
1876 dprintk("NFSD: end of grace period\n");
c7b9a459 1877 nfsd4_recdir_purge_old();
a76b4319
N		 1878 in_grace = 0;
1879}
1880
fd39ca9a 1881static time_t
1da177e4
LT		 1882nfs4_laundromat(void)
1883{
1884 struct nfs4_client *clp;
1885 struct nfs4_stateowner *sop;
1886 struct nfs4_delegation *dp;
1887 struct list_head *pos, *next, reaplist;
1888 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1889 time_t t, clientid_val = NFSD_LEASE_TIME;
1890 time_t u, test_val = NFSD_LEASE_TIME;
1891
1892 nfs4_lock_state();
1893
1894 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1895 if (in_grace)
1896 end_grace();
1da177e4
LT		 1897 list_for_each_safe(pos, next, &client_lru) {
1898 clp = list_entry(pos, struct nfs4_client, cl_lru);
1899 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1900 t = clp->cl_time - cutoff;
1901 if (clientid_val > t)
1902 clientid_val = t;
1903 break;
1904 }
1905 dprintk("NFSD: purging unused client (clientid %08x)\n",
1906 clp->cl_clientid.cl_id);
c7b9a459 1907 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1908 expire_client(clp);
1909 }
1910 INIT_LIST_HEAD(&reaplist);
1911 spin_lock(&recall_lock);
1912 list_for_each_safe(pos, next, &del_recall_lru) {
1913 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1914 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1915 u = dp->dl_time - cutoff;
1916 if (test_val > u)
1917 test_val = u;
1918 break;
1919 }
1920 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1921 dp, dp->dl_flock);
1922 list_move(&dp->dl_recall_lru, &reaplist);
1923 }
1924 spin_unlock(&recall_lock);
1925 list_for_each_safe(pos, next, &reaplist) {
1926 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1927 list_del_init(&dp->dl_recall_lru);
1928 unhash_delegation(dp);
1929 }
1930 test_val = NFSD_LEASE_TIME;
1931 list_for_each_safe(pos, next, &close_lru) {
1932 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1933 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1934 u = sop->so_time - cutoff;
1935 if (test_val > u)
1936 test_val = u;
1937 break;
1938 }
1939 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1940 sop->so_id);
358dd55a 1941 release_stateowner(sop);
1da177e4
LT		 1942 }
1943 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1944 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1945 nfs4_unlock_state();
1946 return clientid_val;
1947}
1948
1949void
c4028958 1950laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1951{
1952 time_t t;
1953
1954 t = nfs4_laundromat();
1955 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1956 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1957}
1958
fd39ca9a 1959static struct nfs4_stateowner *
f8816512
N		 1960search_close_lru(u32 st_id, int flags)
1961{
1da177e4
LT		 1962 struct nfs4_stateowner *local = NULL;
1963
1da177e4
LT		 1964 if (flags & CLOSE_STATE) {
1965 list_for_each_entry(local, &close_lru, so_close_lru) {
1966 if (local->so_id == st_id)
1967 return local;
1968 }
1969 }
1970 return NULL;
1971}
1972
1973static inline int
1974nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1975{
7eaa36e2 1976 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1977}
1978
1979static int
1980STALE_STATEID(stateid_t *stateid)
1981{
1982 if (stateid->si_boot == boot_time)
1983 return 0;
849823c5 1984 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1985 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1986 stateid->si_generation);
1987 return 1;
1988}
1989
1990static inline int
1991access_permit_read(unsigned long access_bmap)
1992{
1993 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1994 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1995 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1996}
1997
1998static inline int
1999access_permit_write(unsigned long access_bmap)
2000{
2001 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2002 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2003}
2004
2005static
b37ad28b 2006__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2007{
b37ad28b 2008 __be32 status = nfserr_openmode;
1da177e4
LT		 2009
2010 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2011 goto out;
2012 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2013 goto out;
2014 status = nfs_ok;
2015out:
2016 return status;
2017}
2018
b37ad28b 2019static inline __be32
1da177e4
LT		 2020check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2021{
2022 /* Trying to call delegreturn with a special stateid? Yuch: */
2023 if (!(flags & (RD_STATE | WR_STATE)))
2024 return nfserr_bad_stateid;
2025 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2026 return nfs_ok;
2027 else if (nfs4_in_grace()) {
2028 /* Answer in remaining cases depends on existance of
2029 * conflicting state; so we must wait out the grace period. */
2030 return nfserr_grace;
2031 } else if (flags & WR_STATE)
2032 return nfs4_share_conflict(current_fh,
2033 NFS4_SHARE_DENY_WRITE);
2034 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2035 return nfs4_share_conflict(current_fh,
2036 NFS4_SHARE_DENY_READ);
2037}
2038
2039/*
2040 * Allow READ/WRITE during grace period on recovered state only for files
2041 * that are not able to provide mandatory locking.
2042 */
2043static inline int
2044io_during_grace_disallowed(struct inode *inode, int flags)
2045{
2046 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2047 && MANDATORY_LOCK(inode);
2048}
2049
2050/*
2051* Checks for stateid operations
2052*/
b37ad28b 2053__be32
1da177e4
LT		 2054nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2055{
2056 struct nfs4_stateid *stp = NULL;
2057 struct nfs4_delegation *dp = NULL;
2058 stateid_t *stidp;
2059 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2060 __be32 status;
1da177e4
LT		 2061
2062 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2063 stateid->si_boot, stateid->si_stateownerid,
2064 stateid->si_fileid, stateid->si_generation);
2065 if (filpp)
2066 *filpp = NULL;
2067
2068 if (io_during_grace_disallowed(ino, flags))
2069 return nfserr_grace;
2070
2071 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2072 return check_special_stateids(current_fh, stateid, flags);
2073
2074 /* STALE STATEID */
2075 status = nfserr_stale_stateid;
2076 if (STALE_STATEID(stateid))
2077 goto out;
2078
2079 /* BAD STATEID */
2080 status = nfserr_bad_stateid;
2081 if (!stateid->si_fileid) { /* delegation stateid */
2082 if(!(dp = find_delegation_stateid(ino, stateid))) {
2083 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2084 goto out;
2085 }
2086 stidp = &dp->dl_stateid;
2087 } else { /* open or lock stateid */
2088 if (!(stp = find_stateid(stateid, flags))) {
2089 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2090 goto out;
2091 }
2092 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2093 goto out;
2094 if (!stp->st_stateowner->so_confirmed)
2095 goto out;
2096 stidp = &stp->st_stateid;
2097 }
2098 if (stateid->si_generation > stidp->si_generation)
2099 goto out;
2100
2101 /* OLD STATEID */
2102 status = nfserr_old_stateid;
2103 if (stateid->si_generation < stidp->si_generation)
2104 goto out;
2105 if (stp) {
2106 if ((status = nfs4_check_openmode(stp,flags)))
2107 goto out;
2108 renew_client(stp->st_stateowner->so_client);
2109 if (filpp)
2110 *filpp = stp->st_vfs_file;
2111 } else if (dp) {
2112 if ((status = nfs4_check_delegmode(dp, flags)))
2113 goto out;
2114 renew_client(dp->dl_client);
2115 if (flags & DELEG_RET)
2116 unhash_delegation(dp);
2117 if (filpp)
2118 *filpp = dp->dl_vfs_file;
2119 }
2120 status = nfs_ok;
2121out:
2122 return status;
2123}
2124
4c4cd222
N		 2125static inline int
2126setlkflg (int type)
2127{
2128 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2129 RD_STATE : WR_STATE;
2130}
1da177e4
LT		 2131
2132/*
2133 * Checks for sequence id mutating operations.
2134 */
b37ad28b 2135static __be32
4c4cd222 2136nfs4_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 2137{
1da177e4
LT		 2138 struct nfs4_stateid *stp;
2139 struct nfs4_stateowner *sop;
2140
2141 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2142 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2143 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2144 stateid->si_generation);
3a4f98bb 2145
1da177e4
LT		 2146 *stpp = NULL;
2147 *sopp = NULL;
2148
1da177e4
LT		 2149 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2150 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2151 return nfserr_bad_stateid;
1da177e4
LT		 2152 }
2153
1da177e4 2154 if (STALE_STATEID(stateid))
3a4f98bb 2155 return nfserr_stale_stateid;
1da177e4
LT		 2156 /*
2157 * We return BAD_STATEID if filehandle doesn't match stateid,
2158 * the confirmed flag is incorrecly set, or the generation
2159 * number is incorrect.
1da177e4 2160 */
f8816512
N		 2161 stp = find_stateid(stateid, flags);
2162 if (stp == NULL) {
2163 /*
2164 * Also, we should make sure this isn't just the result of
2165 * a replayed close:
2166 */
2167 sop = search_close_lru(stateid->si_stateownerid, flags);
2168 if (sop == NULL)
2169 return nfserr_bad_stateid;
2170 *sopp = sop;
2171 goto check_replay;
2172 }
1da177e4 2173
4c4cd222 2174 if (lock) {
1da177e4 2175 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2176 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2177 struct nfs4_client *clp = sop->so_client;
4c4cd222 2178 int lkflg = 0;
b37ad28b 2179 __be32 status;
4c4cd222
N		 2180
2181 lkflg = setlkflg(lock->lk_type);
2182
2183 if (lock->lk_is_new) {
2184 if (!sop->so_is_open_owner)
2185 return nfserr_bad_stateid;
2186 if (!cmp_clid(&clp->cl_clientid, lockclid))
2187 return nfserr_bad_stateid;
2188 /* stp is the open stateid */
2189 status = nfs4_check_openmode(stp, lkflg);
2190 if (status)
2191 return status;
2192 } else {
2193 /* stp is the lock stateid */
2194 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2195 if (status)
2196 return status;
2197 }
1da177e4 2198
1da177e4
LT		 2199 }
2200
2201 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2202 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2203 return nfserr_bad_stateid;
1da177e4
LT		 2204 }
2205
2206 *stpp = stp;
2207 *sopp = sop = stp->st_stateowner;
2208
2209 /*
2210 * We now validate the seqid and stateid generation numbers.
2211 * For the moment, we ignore the possibility of
2212 * generation number wraparound.
2213 */
bd9aac52 2214 if (seqid != sop->so_seqid)
1da177e4
LT		 2215 goto check_replay;
2216
3a4f98bb
N		 2217 if (sop->so_confirmed && flags & CONFIRM) {
2218 printk("NFSD: preprocess_seqid_op: expected"
2219 " unconfirmed stateowner!\n");
2220 return nfserr_bad_stateid;
1da177e4 2221 }
3a4f98bb
N		 2222 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2223 printk("NFSD: preprocess_seqid_op: stateowner not"
2224 " confirmed yet!\n");
2225 return nfserr_bad_stateid;
1da177e4
LT		 2226 }
2227 if (stateid->si_generation > stp->st_stateid.si_generation) {
2228 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2229 return nfserr_bad_stateid;
1da177e4
LT		 2230 }
2231
1da177e4
LT		 2232 if (stateid->si_generation < stp->st_stateid.si_generation) {
2233 printk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2234 return nfserr_old_stateid;
1da177e4 2235 }
52fd004e 2236 renew_client(sop->so_client);
3a4f98bb 2237 return nfs_ok;
1da177e4 2238
1da177e4 2239check_replay:
bd9aac52 2240 if (seqid == sop->so_seqid - 1) {
849823c5 2241 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2242 /* indicate replay to calling function */
a90b061c 2243 return nfserr_replay_me;
1da177e4 2244 }
3a4f98bb
N		 2245 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2246 sop->so_seqid, seqid);
2247 *sopp = NULL;
2248 return nfserr_bad_seqid;
1da177e4
LT		 2249}
2250
b37ad28b 2251__be32
ca364317 2252nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2253 struct nfsd4_open_confirm *oc)
1da177e4 2254{
b37ad28b 2255 __be32 status;
1da177e4
LT		 2256 struct nfs4_stateowner *sop;
2257 struct nfs4_stateid *stp;
2258
2259 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2260 (int)cstate->current_fh.fh_dentry->d_name.len,
2261 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2262
ca364317 2263 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2264 if (status)
2265 return status;
1da177e4
LT		 2266
2267 nfs4_lock_state();
2268
ca364317
BF		 2269 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2270 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2271 CHECK_FH | CONFIRM | OPEN_STATE,
2272 &oc->oc_stateowner, &stp, NULL)))
2273 goto out;
2274
2275 sop = oc->oc_stateowner;
2276 sop->so_confirmed = 1;
2277 update_stateid(&stp->st_stateid);
2278 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2279 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2280 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2281 stp->st_stateid.si_boot,
2282 stp->st_stateid.si_stateownerid,
2283 stp->st_stateid.si_fileid,
2284 stp->st_stateid.si_generation);
c7b9a459
N		 2285
2286 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2287out:
f2327d9a 2288 if (oc->oc_stateowner) {
1da177e4 2289 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2290 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2291 }
1da177e4
LT		 2292 nfs4_unlock_state();
2293 return status;
2294}
2295
2296
2297/*
2298 * unset all bits in union bitmap (bmap) that
2299 * do not exist in share (from successful OPEN_DOWNGRADE)
2300 */
2301static void
2302reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2303{
2304 int i;
2305 for (i = 1; i < 4; i++) {
2306 if ((i & access) != i)
2307 __clear_bit(i, bmap);
2308 }
2309}
2310
2311static void
2312reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2313{
2314 int i;
2315 for (i = 0; i < 4; i++) {
2316 if ((i & deny) != i)
2317 __clear_bit(i, bmap);
2318 }
2319}
2320
b37ad28b 2321__be32
ca364317
BF		 2322nfsd4_open_downgrade(struct svc_rqst *rqstp,
2323 struct nfsd4_compound_state *cstate,
a4f1706a 2324 struct nfsd4_open_downgrade *od)
1da177e4 2325{
b37ad28b 2326 __be32 status;
1da177e4
LT		 2327 struct nfs4_stateid *stp;
2328 unsigned int share_access;
2329
2330 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2331 (int)cstate->current_fh.fh_dentry->d_name.len,
2332 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2333
ba5a6a19
BF		 2334 if (!access_valid(od->od_share_access)
2335 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2336 return nfserr_inval;
2337
2338 nfs4_lock_state();
ca364317
BF		 2339 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2340 od->od_seqid,
1da177e4
LT		 2341 &od->od_stateid,
2342 CHECK_FH | OPEN_STATE,
2343 &od->od_stateowner, &stp, NULL)))
2344 goto out;
2345
2346 status = nfserr_inval;
2347 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2348 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2349 stp->st_access_bmap, od->od_share_access);
2350 goto out;
2351 }
2352 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2353 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2354 stp->st_deny_bmap, od->od_share_deny);
2355 goto out;
2356 }
2357 set_access(&share_access, stp->st_access_bmap);
2358 nfs4_file_downgrade(stp->st_vfs_file,
2359 share_access & ~od->od_share_access);
2360
2361 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2362 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2363
2364 update_stateid(&stp->st_stateid);
2365 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2366 status = nfs_ok;
2367out:
f2327d9a 2368 if (od->od_stateowner) {
1da177e4 2369 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2370 cstate->replay_owner = od->od_stateowner;
f2327d9a 2371 }
1da177e4
LT		 2372 nfs4_unlock_state();
2373 return status;
2374}
2375
2376/*
2377 * nfs4_unlock_state() called after encode
2378 */
b37ad28b 2379__be32
ca364317 2380nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2381 struct nfsd4_close *close)
1da177e4 2382{
b37ad28b 2383 __be32 status;
1da177e4
LT		 2384 struct nfs4_stateid *stp;
2385
2386 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2387 (int)cstate->current_fh.fh_dentry->d_name.len,
2388 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2389
2390 nfs4_lock_state();
2391 /* check close_lru for replay */
ca364317
BF		 2392 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2393 close->cl_seqid,
1da177e4
LT		 2394 &close->cl_stateid,
2395 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2396 &close->cl_stateowner, &stp, NULL)))
2397 goto out;
1da177e4
LT		 2398 status = nfs_ok;
2399 update_stateid(&stp->st_stateid);
2400 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2401
04ef5954
BF		 2402 /* release_stateid() calls nfsd_close() if needed */
2403 release_stateid(stp, OPEN_STATE);
2404
2405 /* place unused nfs4_stateowners on so_close_lru list to be
2406 * released by the laundromat service after the lease period
2407 * to enable us to handle CLOSE replay
2408 */
2409 if (list_empty(&close->cl_stateowner->so_stateids))
2410 move_to_close_lru(close->cl_stateowner);
1da177e4 2411out:
f2327d9a 2412 if (close->cl_stateowner) {
1da177e4 2413 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2414 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2415 }
1da177e4
LT		 2416 nfs4_unlock_state();
2417 return status;
2418}
2419
b37ad28b 2420__be32
ca364317
BF		 2421nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2422 struct nfsd4_delegreturn *dr)
1da177e4 2423{
b37ad28b 2424 __be32 status;
1da177e4 2425
ca364317 2426 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2427 goto out;
2428
2429 nfs4_lock_state();
ca364317
BF		 2430 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2431 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2432 nfs4_unlock_state();
2433out:
2434 return status;
2435}
2436
2437
2438/*
2439 * Lock owner state (byte-range locks)
2440 */
2441#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2442#define LOCK_HASH_BITS 8
2443#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2444#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2445
2446#define lockownerid_hashval(id) \
2447 ((id) & LOCK_HASH_MASK)
2448
2449static inline unsigned int
2450lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2451 struct xdr_netobj *ownername)
2452{
2453 return (file_hashval(inode) + cl_id
2454 + opaque_hashval(ownername->data, ownername->len))
2455 & LOCK_HASH_MASK;
2456}
2457
2458static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2459static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2460static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2461
fd39ca9a 2462static struct nfs4_stateid *
1da177e4
LT		 2463find_stateid(stateid_t *stid, int flags)
2464{
2465 struct nfs4_stateid *local = NULL;
2466 u32 st_id = stid->si_stateownerid;
2467 u32 f_id = stid->si_fileid;
2468 unsigned int hashval;
2469
2470 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2471 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2472 hashval = stateid_hashval(st_id, f_id);
2473 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2474 if ((local->st_stateid.si_stateownerid == st_id) &&
2475 (local->st_stateid.si_fileid == f_id))
2476 return local;
2477 }
2478 }
2479 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2480 hashval = stateid_hashval(st_id, f_id);
2481 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2482 if ((local->st_stateid.si_stateownerid == st_id) &&
2483 (local->st_stateid.si_fileid == f_id))
2484 return local;
2485 }
849823c5 2486 }
1da177e4
LT		 2487 return NULL;
2488}
2489
2490static struct nfs4_delegation *
2491find_delegation_stateid(struct inode *ino, stateid_t *stid)
2492{
13cd2184
N		 2493 struct nfs4_file *fp;
2494 struct nfs4_delegation *dl;
1da177e4
LT		 2495
2496 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2497 stid->si_boot, stid->si_stateownerid,
2498 stid->si_fileid, stid->si_generation);
2499
1da177e4 2500 fp = find_file(ino);
13cd2184
N		 2501 if (!fp)
2502 return NULL;
2503 dl = find_delegation_file(fp, stid);
2504 put_nfs4_file(fp);
2505 return dl;
1da177e4
LT		 2506}
2507
2508/*
2509 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2510 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2511 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2512 * locking, this prevents us from being completely protocol-compliant. The
2513 * real solution to this problem is to start using unsigned file offsets in
2514 * the VFS, but this is a very deep change!
2515 */
2516static inline void
2517nfs4_transform_lock_offset(struct file_lock *lock)
2518{
2519 if (lock->fl_start < 0)
2520 lock->fl_start = OFFSET_MAX;
2521 if (lock->fl_end < 0)
2522 lock->fl_end = OFFSET_MAX;
2523}
2524
d5b9026a
N		 2525/* Hack!: For now, we're defining this just so we can use a pointer to it
2526 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2527static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2528};
1da177e4
LT		 2529
2530static inline void
2531nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2532{
d5b9026a
N		 2533 struct nfs4_stateowner *sop;
2534 unsigned int hval;
1da177e4 2535
d5b9026a
N		 2536 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2537 sop = (struct nfs4_stateowner *) fl->fl_owner;
2538 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2539 kref_get(&sop->so_ref);
2540 deny->ld_sop = sop;
2541 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2542 } else {
2543 deny->ld_sop = NULL;
2544 deny->ld_clientid.cl_boot = 0;
2545 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2546 }
2547 deny->ld_start = fl->fl_start;
2548 deny->ld_length = ~(u64)0;
2549 if (fl->fl_end != ~(u64)0)
2550 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2551 deny->ld_type = NFS4_READ_LT;
2552 if (fl->fl_type != F_RDLCK)
2553 deny->ld_type = NFS4_WRITE_LT;
2554}
2555
1da177e4
LT		 2556static struct nfs4_stateowner *
2557find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2558 struct xdr_netobj *owner)
2559{
2560 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2561 struct nfs4_stateowner *op;
2562
2563 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2564 if (cmp_owner_str(op, owner, clid))
2565 return op;
2566 }
2567 return NULL;
2568}
2569
2570/*
2571 * Alloc a lock owner structure.
2572 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2573 * occured.
2574 *
2575 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2576 */
2577
2578static struct nfs4_stateowner *
2579alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2580 struct nfs4_stateowner *sop;
2581 struct nfs4_replay *rp;
2582 unsigned int idhashval;
2583
2584 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2585 return NULL;
2586 idhashval = lockownerid_hashval(current_ownerid);
2587 INIT_LIST_HEAD(&sop->so_idhash);
2588 INIT_LIST_HEAD(&sop->so_strhash);
2589 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2590 INIT_LIST_HEAD(&sop->so_stateids);
2591 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2592 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2593 sop->so_time = 0;
2594 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2595 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2596 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2597 sop->so_is_open_owner = 0;
2598 sop->so_id = current_ownerid++;
2599 sop->so_client = clp;
b59e3c0e
NB		 2600 /* It is the openowner seqid that will be incremented in encode in the
2601 * case of new lockowners; so increment the lock seqid manually: */
2602 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2603 sop->so_confirmed = 1;
2604 rp = &sop->so_replay;
de1ae286 2605 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2606 rp->rp_buflen = 0;
2607 rp->rp_buf = rp->rp_ibuf;
2608 return sop;
2609}
2610
fd39ca9a 2611static struct nfs4_stateid *
1da177e4
LT		 2612alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2613{
2614 struct nfs4_stateid *stp;
2615 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2616
5ac049ac
N		 2617 stp = nfs4_alloc_stateid();
2618 if (stp == NULL)
1da177e4
LT		 2619 goto out;
2620 INIT_LIST_HEAD(&stp->st_hash);
2621 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2622 INIT_LIST_HEAD(&stp->st_perstateowner);
2623 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2624 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2625 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2626 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2627 stp->st_stateowner = sop;
13cd2184 2628 get_nfs4_file(fp);
1da177e4
LT		 2629 stp->st_file = fp;
2630 stp->st_stateid.si_boot = boot_time;
2631 stp->st_stateid.si_stateownerid = sop->so_id;
2632 stp->st_stateid.si_fileid = fp->fi_id;
2633 stp->st_stateid.si_generation = 0;
2634 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2635 stp->st_access_bmap = open_stp->st_access_bmap;
2636 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2637 stp->st_openstp = open_stp;
1da177e4
LT		 2638
2639out:
2640 return stp;
2641}
2642
fd39ca9a 2643static int
1da177e4
LT		 2644check_lock_length(u64 offset, u64 length)
2645{
2646 return ((length == 0) || ((length != ~(u64)0) &&
2647 LOFF_OVERFLOW(offset, length)));
2648}
2649
2650/*
2651 * LOCK operation
2652 */
b37ad28b 2653__be32
ca364317 2654nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2655 struct nfsd4_lock *lock)
1da177e4 2656{
3e9e3dbe 2657 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2658 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2659 struct nfs4_stateid *lock_stp;
2660 struct file *filp;
2661 struct file_lock file_lock;
8dc7c311 2662 struct file_lock conflock;
b37ad28b 2663 __be32 status = 0;
1da177e4 2664 unsigned int strhashval;
150b3934 2665 unsigned int cmd;
b8dd7b9a 2666 int err;
1da177e4
LT		 2667
2668 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2669 (long long) lock->lk_offset,
2670 (long long) lock->lk_length);
2671
1da177e4
LT		 2672 if (check_lock_length(lock->lk_offset, lock->lk_length))
2673 return nfserr_inval;
2674
ca364317
BF		 2675 if ((status = fh_verify(rqstp, &cstate->current_fh,
2676 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2677 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2678 return status;
2679 }
2680
1da177e4
LT		 2681 nfs4_lock_state();
2682
2683 if (lock->lk_is_new) {
893f8770
N		 2684 /*
2685 * Client indicates that this is a new lockowner.
2686 * Use open owner and open stateid to create lock owner and
2687 * lock stateid.
2688 */
1da177e4
LT		 2689 struct nfs4_stateid *open_stp = NULL;
2690 struct nfs4_file *fp;
2691
2692 status = nfserr_stale_clientid;
849823c5 2693 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2694 goto out;
1da177e4 2695
1da177e4 2696 /* validate and update open stateid and open seqid */
ca364317 2697 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2698 lock->lk_new_open_seqid,
2699 &lock->lk_new_open_stateid,
2700 CHECK_FH | OPEN_STATE,
3a65588a 2701 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2702 lock);
37515177 2703 if (status)
1da177e4 2704 goto out;
3a65588a 2705 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2706 /* create lockowner and lock stateid */
2707 fp = open_stp->st_file;
2708 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2709 open_sop->so_client->cl_clientid.cl_id,
2710 &lock->v.new.owner);
3e9e3dbe
N		 2711 /* XXX: Do we need to check for duplicate stateowners on
2712 * the same file, or should they just be allowed (and
2713 * create new stateids)? */
1da177e4 2714 status = nfserr_resource;
b59e3c0e
NB		 2715 lock_sop = alloc_init_lock_stateowner(strhashval,
2716 open_sop->so_client, open_stp, lock);
2717 if (lock_sop == NULL)
1da177e4 2718 goto out;
b59e3c0e 2719 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2720 if (lock_stp == NULL)
1da177e4 2721 goto out;
1da177e4
LT		 2722 } else {
2723 /* lock (lock owner + lock stateid) already exists */
ca364317 2724 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2725 lock->lk_old_lock_seqid,
2726 &lock->lk_old_lock_stateid,
2727 CHECK_FH | LOCK_STATE,
3a65588a 2728 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2729 if (status)
2730 goto out;
3a65588a 2731 lock_sop = lock->lk_replay_owner;
1da177e4 2732 }
3a65588a 2733 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2734 filp = lock_stp->st_vfs_file;
2735
0dd395dc
N		 2736 status = nfserr_grace;
2737 if (nfs4_in_grace() && !lock->lk_reclaim)
2738 goto out;
2739 status = nfserr_no_grace;
2740 if (!nfs4_in_grace() && lock->lk_reclaim)
2741 goto out;
2742
1da177e4
LT		 2743 locks_init_lock(&file_lock);
2744 switch (lock->lk_type) {
2745 case NFS4_READ_LT:
2746 case NFS4_READW_LT:
2747 file_lock.fl_type = F_RDLCK;
150b3934 2748 cmd = F_SETLK;
1da177e4
LT		 2749 break;
2750 case NFS4_WRITE_LT:
2751 case NFS4_WRITEW_LT:
2752 file_lock.fl_type = F_WRLCK;
150b3934 2753 cmd = F_SETLK;
1da177e4
LT		 2754 break;
2755 default:
2756 status = nfserr_inval;
2757 goto out;
2758 }
b59e3c0e 2759 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2760 file_lock.fl_pid = current->tgid;
2761 file_lock.fl_file = filp;
2762 file_lock.fl_flags = FL_POSIX;
d5b9026a 2763 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2764
2765 file_lock.fl_start = lock->lk_offset;
2766 if ((lock->lk_length == ~(u64)0) ||
2767 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2768 file_lock.fl_end = ~(u64)0;
2769 else
2770 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2771 nfs4_transform_lock_offset(&file_lock);
2772
2773 /*
2774 * Try to lock the file in the VFS.
2775 * Note: locks.c uses the BKL to protect the inode's lock list.
2776 */
2777
eb76b3fd
AA		 2778 /* XXX?: Just to divert the locks_release_private at the start of
2779 * locks_copy_lock: */
150b3934 2780 locks_init_lock(&conflock);
fd85b817 2781 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2782 switch (-err) {
1da177e4
LT		 2783 case 0: /* success! */
2784 update_stateid(&lock_stp->st_stateid);
2785 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2786 sizeof(stateid_t));
b8dd7b9a 2787 status = 0;
eb76b3fd
AA		 2788 break;
2789 case (EAGAIN): /* conflock holds conflicting lock */
2790 status = nfserr_denied;
2791 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2792 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2793 break;
1da177e4
LT		 2794 case (EDEADLK):
2795 status = nfserr_deadlock;
eb76b3fd 2796 break;
1da177e4 2797 default:
fd85b817 2798 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2799 status = nfserr_resource;
2800 break;
1da177e4 2801 }
1da177e4 2802out:
8a280510
BF		 2803 if (status && lock->lk_is_new && lock_sop)
2804 release_stateowner(lock_sop);
3a65588a
BF		 2805 if (lock->lk_replay_owner) {
2806 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2807 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2808 }
1da177e4
LT		 2809 nfs4_unlock_state();
2810 return status;
2811}
2812
2813/*
2814 * LOCKT operation
2815 */
b37ad28b 2816__be32
ca364317
BF		 2817nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2818 struct nfsd4_lockt *lockt)
1da177e4
LT		 2819{
2820 struct inode *inode;
2821 struct file file;
2822 struct file_lock file_lock;
fd85b817 2823 int error;
b37ad28b 2824 __be32 status;
1da177e4
LT		 2825
2826 if (nfs4_in_grace())
2827 return nfserr_grace;
2828
2829 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2830 return nfserr_inval;
2831
2832 lockt->lt_stateowner = NULL;
2833 nfs4_lock_state();
2834
2835 status = nfserr_stale_clientid;
849823c5 2836 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2837 goto out;
1da177e4 2838
ca364317 2839 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2840 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2841 if (status == nfserr_symlink)
2842 status = nfserr_inval;
2843 goto out;
2844 }
2845
ca364317 2846 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2847 locks_init_lock(&file_lock);
2848 switch (lockt->lt_type) {
2849 case NFS4_READ_LT:
2850 case NFS4_READW_LT:
2851 file_lock.fl_type = F_RDLCK;
2852 break;
2853 case NFS4_WRITE_LT:
2854 case NFS4_WRITEW_LT:
2855 file_lock.fl_type = F_WRLCK;
2856 break;
2857 default:
2858 printk("NFSD: nfs4_lockt: bad lock type!\n");
2859 status = nfserr_inval;
2860 goto out;
2861 }
2862
2863 lockt->lt_stateowner = find_lockstateowner_str(inode,
2864 &lockt->lt_clientid, &lockt->lt_owner);
2865 if (lockt->lt_stateowner)
2866 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2867 file_lock.fl_pid = current->tgid;
2868 file_lock.fl_flags = FL_POSIX;
d5b9026a 2869 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2870
2871 file_lock.fl_start = lockt->lt_offset;
2872 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2873 file_lock.fl_end = ~(u64)0;
2874 else
2875 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2876
2877 nfs4_transform_lock_offset(&file_lock);
2878
fd85b817 2879 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2880 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2881 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2882 * only the dentry:inode set.
2883 */
2884 memset(&file, 0, sizeof (struct file));
ca364317 2885 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2886
2887 status = nfs_ok;
fd85b817
ME		 2888 error = vfs_test_lock(&file, &file_lock);
2889 if (error) {
2890 status = nfserrno(error);
2891 goto out;
2892 }
9d6a8c5c 2893 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2894 status = nfserr_denied;
9d6a8c5c 2895 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2896 }
2897out:
2898 nfs4_unlock_state();
2899 return status;
2900}
2901
b37ad28b 2902__be32
ca364317 2903nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2904 struct nfsd4_locku *locku)
1da177e4
LT		 2905{
2906 struct nfs4_stateid *stp;
2907 struct file *filp = NULL;
2908 struct file_lock file_lock;
b37ad28b 2909 __be32 status;
b8dd7b9a 2910 int err;
1da177e4
LT		 2911
2912 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2913 (long long) locku->lu_offset,
2914 (long long) locku->lu_length);
2915
2916 if (check_lock_length(locku->lu_offset, locku->lu_length))
2917 return nfserr_inval;
2918
2919 nfs4_lock_state();
2920
ca364317 2921 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2922 locku->lu_seqid,
2923 &locku->lu_stateid,
2924 CHECK_FH | LOCK_STATE,
2925 &locku->lu_stateowner, &stp, NULL)))
2926 goto out;
2927
2928 filp = stp->st_vfs_file;
2929 BUG_ON(!filp);
2930 locks_init_lock(&file_lock);
2931 file_lock.fl_type = F_UNLCK;
2932 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2933 file_lock.fl_pid = current->tgid;
2934 file_lock.fl_file = filp;
2935 file_lock.fl_flags = FL_POSIX;
d5b9026a 2936 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2937 file_lock.fl_start = locku->lu_offset;
2938
2939 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2940 file_lock.fl_end = ~(u64)0;
2941 else
2942 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2943 nfs4_transform_lock_offset(&file_lock);
2944
2945 /*
2946 * Try to unlock the file in the VFS.
2947 */
fd85b817 2948 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2949 if (err) {
fd85b817 2950 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2951 goto out_nfserr;
2952 }
2953 /*
2954 * OK, unlock succeeded; the only thing left to do is update the stateid.
2955 */
2956 update_stateid(&stp->st_stateid);
2957 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2958
2959out:
f2327d9a 2960 if (locku->lu_stateowner) {
1da177e4 2961 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2962 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2963 }
1da177e4
LT		 2964 nfs4_unlock_state();
2965 return status;
2966
2967out_nfserr:
b8dd7b9a 2968 status = nfserrno(err);
1da177e4
LT		 2969 goto out;
2970}
2971
2972/*
2973 * returns
2974 * 1: locks held by lockowner
2975 * 0: no locks held by lockowner
2976 */
2977static int
2978check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2979{
2980 struct file_lock **flpp;
7eaa36e2 2981 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2982 int status = 0;
2983
2984 lock_kernel();
2985 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2986 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2987 status = 1;
2988 goto out;
796dadfd 2989 }
1da177e4
LT		 2990 }
2991out:
2992 unlock_kernel();
2993 return status;
2994}
2995
b37ad28b 2996__be32
b591480b
BF		 2997nfsd4_release_lockowner(struct svc_rqst *rqstp,
2998 struct nfsd4_compound_state *cstate,
2999 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3000{
3001 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3002 struct nfs4_stateowner *sop;
3003 struct nfs4_stateid *stp;
1da177e4 3004 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3005 struct list_head matches;
3006 int i;
b37ad28b 3007 __be32 status;
1da177e4
LT		 3008
3009 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3010 clid->cl_boot, clid->cl_id);
3011
3012 /* XXX check for lease expiration */
3013
3014 status = nfserr_stale_clientid;
849823c5 3015 if (STALE_CLIENTID(clid))
1da177e4 3016 return status;
1da177e4
LT		 3017
3018 nfs4_lock_state();
3019
3e9e3dbe
N		 3020 status = nfserr_locks_held;
3021 /* XXX: we're doing a linear search through all the lockowners.
3022 * Yipes! For now we'll just hope clients aren't really using
3023 * release_lockowner much, but eventually we have to fix these
3024 * data structures. */
3025 INIT_LIST_HEAD(&matches);
3026 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3027 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3028 if (!cmp_owner_str(sop, owner, clid))
3029 continue;
3030 list_for_each_entry(stp, &sop->so_stateids,
3031 st_perstateowner) {
3032 if (check_for_locks(stp->st_vfs_file, sop))
3033 goto out;
3034 /* Note: so_perclient unused for lockowners,
3035 * so it's OK to fool with here. */
3036 list_add(&sop->so_perclient, &matches);
3037 }
1da177e4 3038 }
3e9e3dbe
N		 3039 }
3040 /* Clients probably won't expect us to return with some (but not all)
3041 * of the lockowner state released; so don't release any until all
3042 * have been checked. */
3043 status = nfs_ok;
0fa822e4
N		 3044 while (!list_empty(&matches)) {
3045 sop = list_entry(matches.next, struct nfs4_stateowner,
3046 so_perclient);
3047 /* unhash_stateowner deletes so_perclient only
3048 * for openowners. */
3049 list_del(&sop->so_perclient);
3e9e3dbe 3050 release_stateowner(sop);
1da177e4
LT		 3051 }
3052out:
3053 nfs4_unlock_state();
3054 return status;
3055}
3056
3057static inline struct nfs4_client_reclaim *
a55370a3 3058alloc_reclaim(void)
1da177e4 3059{
a55370a3 3060 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3061}
3062
c7b9a459
N		 3063int
3064nfs4_has_reclaimed_state(const char *name)
3065{
3066 unsigned int strhashval = clientstr_hashval(name);
3067 struct nfs4_client *clp;
3068
3069 clp = find_confirmed_client_by_str(name, strhashval);
3070 return clp ? 1 : 0;
3071}
3072
1da177e4
LT		 3073/*
3074 * failure => all reset bets are off, nfserr_no_grace...
3075 */
190e4fbf
N		 3076int
3077nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3078{
3079 unsigned int strhashval;
3080 struct nfs4_client_reclaim *crp = NULL;
3081
a55370a3
N		 3082 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3083 crp = alloc_reclaim();
1da177e4
LT		 3084 if (!crp)
3085 return 0;
a55370a3 3086 strhashval = clientstr_hashval(name);
1da177e4
LT		 3087 INIT_LIST_HEAD(&crp->cr_strhash);
3088 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3089 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3090 reclaim_str_hashtbl_size++;
3091 return 1;
3092}
3093
3094static void
3095nfs4_release_reclaim(void)
3096{
3097 struct nfs4_client_reclaim *crp = NULL;
3098 int i;
3099
1da177e4
LT		 3100 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3101 while (!list_empty(&reclaim_str_hashtbl[i])) {
3102 crp = list_entry(reclaim_str_hashtbl[i].next,
3103 struct nfs4_client_reclaim, cr_strhash);
3104 list_del(&crp->cr_strhash);
1da177e4
LT		 3105 kfree(crp);
3106 reclaim_str_hashtbl_size--;
3107 }
3108 }
3109 BUG_ON(reclaim_str_hashtbl_size);
3110}
3111
3112/*
3113 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3114static struct nfs4_client_reclaim *
1da177e4
LT		 3115nfs4_find_reclaim_client(clientid_t *clid)
3116{
3117 unsigned int strhashval;
3118 struct nfs4_client *clp;
3119 struct nfs4_client_reclaim *crp = NULL;
3120
3121
3122 /* find clientid in conf_id_hashtbl */
3123 clp = find_confirmed_client(clid);
3124 if (clp == NULL)
3125 return NULL;
3126
a55370a3
N		 3127 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3128 clp->cl_name.len, clp->cl_name.data,
3129 clp->cl_recdir);
1da177e4
LT		 3130
3131 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3132 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3133 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3134 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3135 return crp;
3136 }
3137 }
3138 return NULL;
3139}
3140
3141/*
3142* Called from OPEN. Look for clientid in reclaim list.
3143*/
b37ad28b 3144__be32
1da177e4
LT		 3145nfs4_check_open_reclaim(clientid_t *clid)
3146{
dfc83565 3147 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3148}
3149
ac4d8ff2 3150/* initialization to perform at module load time: */
1da177e4 3151
ac4d8ff2
N		 3152void
3153nfs4_state_init(void)
1da177e4
LT		 3154{
3155 int i;
1da177e4 3156
1da177e4
LT		 3157 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3158 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3159 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3160 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3161 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3162 }
3163 for (i = 0; i < FILE_HASH_SIZE; i++) {
3164 INIT_LIST_HEAD(&file_hashtbl[i]);
3165 }
3166 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3167 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3168 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3169 }
3170 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3171 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3172 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3173 }
3174 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3175 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3176 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3177 }
1da177e4 3178 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3179 INIT_LIST_HEAD(&close_lru);
3180 INIT_LIST_HEAD(&client_lru);
3181 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3182 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3183 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3184 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3185}
3186
190e4fbf
N		 3187static void
3188nfsd4_load_reboot_recovery_data(void)
3189{
3190 int status;
3191
0964a3d3
N		 3192 nfs4_lock_state();
3193 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3194 status = nfsd4_recdir_load();
0964a3d3 3195 nfs4_unlock_state();
190e4fbf
N		 3196 if (status)
3197 printk("NFSD: Failure reading reboot recovery data\n");
3198}
3199
9a8db97e
ME		 3200unsigned long
3201get_nfs4_grace_period(void)
3202{
3203 return max(user_lease_time, lease_time) * HZ;
3204}
3205
c2f1a551
MS		 3206/*
3207 * Since the lifetime of a delegation isn't limited to that of an open, a
3208 * client may quite reasonably hang on to a delegation as long as it has
3209 * the inode cached. This becomes an obvious problem the first time a
3210 * client's inode cache approaches the size of the server's total memory.
3211 *
3212 * For now we avoid this problem by imposing a hard limit on the number
3213 * of delegations, which varies according to the server's memory size.
3214 */
3215static void
3216set_max_delegations(void)
3217{
3218 /*
3219 * Allow at most 4 delegations per megabyte of RAM. Quick
3220 * estimates suggest that in the worst case (where every delegation
3221 * is for a different inode), a delegation could take about 1.5K,
3222 * giving a worst case usage of about 6% of memory.
3223 */
3224 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3225}
3226
ac4d8ff2
N		 3227/* initialization to perform when the nfsd service is started: */
3228
3229static void
3230__nfs4_state_start(void)
3231{
9a8db97e 3232 unsigned long grace_time;
ac4d8ff2 3233
1da177e4 3234 boot_time = get_seconds();
9a8db97e 3235 grace_time = get_nfs_grace_period();
d99a05ad 3236 lease_time = user_lease_time;
a76b4319 3237 in_grace = 1;
9a8db97e
ME		 3238 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3239 grace_time/HZ);
58da282b 3240 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3241 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3242 set_max_delegations();
1da177e4
LT		 3243}
3244
3245int
76a3550e 3246nfs4_state_start(void)
1da177e4
LT		 3247{
3248 int status;
3249
3250 if (nfs4_init)
3251 return 0;
3252 status = nfsd4_init_slabs();
3253 if (status)
3254 return status;
190e4fbf 3255 nfsd4_load_reboot_recovery_data();
76a3550e 3256 __nfs4_state_start();
1da177e4
LT		 3257 nfs4_init = 1;
3258 return 0;
3259}
3260
3261int
3262nfs4_in_grace(void)
3263{
a76b4319 3264 return in_grace;
1da177e4
LT		 3265}
3266
3267time_t
3268nfs4_lease_time(void)
3269{
3270 return lease_time;
3271}
3272
3273static void
3274__nfs4_state_shutdown(void)
3275{
3276 int i;
3277 struct nfs4_client *clp = NULL;
3278 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3279 struct list_head *pos, *next, reaplist;
3280
1da177e4
LT		 3281 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3282 while (!list_empty(&conf_id_hashtbl[i])) {
3283 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3284 expire_client(clp);
3285 }
3286 while (!list_empty(&unconf_str_hashtbl[i])) {
3287 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3288 expire_client(clp);
3289 }
3290 }
3291 INIT_LIST_HEAD(&reaplist);
3292 spin_lock(&recall_lock);
3293 list_for_each_safe(pos, next, &del_recall_lru) {
3294 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3295 list_move(&dp->dl_recall_lru, &reaplist);
3296 }
3297 spin_unlock(&recall_lock);
3298 list_for_each_safe(pos, next, &reaplist) {
3299 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3300 list_del_init(&dp->dl_recall_lru);
3301 unhash_delegation(dp);
3302 }
3303
190e4fbf 3304 nfsd4_shutdown_recdir();
1da177e4 3305 nfs4_init = 0;
1da177e4
LT		 3306}
3307
3308void
3309nfs4_state_shutdown(void)
3310{
5e8d5c29
N		 3311 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3312 destroy_workqueue(laundry_wq);
1da177e4
LT		 3313 nfs4_lock_state();
3314 nfs4_release_reclaim();
3315 __nfs4_state_shutdown();
3316 nfsd4_free_slabs();
3317 nfs4_unlock_state();
3318}
3319
0964a3d3
N		 3320static void
3321nfs4_set_recdir(char *recdir)
3322{
3323 nfs4_lock_state();
3324 strcpy(user_recovery_dirname, recdir);
3325 nfs4_unlock_state();
3326}
3327
3328/*
3329 * Change the NFSv4 recovery directory to recdir.
3330 */
3331int
3332nfs4_reset_recoverydir(char *recdir)
3333{
3334 int status;
3335 struct nameidata nd;
3336
3337 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3338 if (status)
3339 return status;
3340 status = -ENOTDIR;
3341 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3342 nfs4_set_recdir(recdir);
3343 status = 0;
3344 }
3345 path_release(&nd);
3346 return status;
3347}
3348
1da177e4
LT		 3349/*
3350 * Called when leasetime is changed.
3351 *
d99a05ad
N		 3352 * The only way the protocol gives us to handle on-the-fly lease changes is to
3353 * simulate a reboot. Instead of doing that, we just wait till the next time
3354 * we start to register any changes in lease time. If the administrator
3355 * really wants to change the lease time *now*, they can go ahead and bring
3356 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3357 */
3358void
3359nfs4_reset_lease(time_t leasetime)
3360{
d99a05ad
N		 3361 lock_kernel();
3362 user_lease_time = leasetime;
3363 unlock_kernel();
1da177e4 3364}
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