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nfsd: minor fs/nfsd/auth.h cleanup
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
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
1b1a9b31
BF		 361static void
362shutdown_callback_client(struct nfs4_client *clp)
363{
364 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
365
366 /* shutdown rpc client, ending any outstanding recall rpcs */
367 if (clnt) {
368 clp->cl_callback.cb_client = NULL;
369 rpc_shutdown_client(clnt);
370 }
371}
372
1da177e4
LT		 373static inline void
374free_client(struct nfs4_client *clp)
375{
1b1a9b31 376 shutdown_callback_client(clp);
1da177e4
LT		 377 if (clp->cl_cred.cr_group_info)
378 put_group_info(clp->cl_cred.cr_group_info);
379 kfree(clp->cl_name.data);
380 kfree(clp);
381}
382
383void
384put_nfs4_client(struct nfs4_client *clp)
385{
386 if (atomic_dec_and_test(&clp->cl_count))
387 free_client(clp);
388}
389
390static void
391expire_client(struct nfs4_client *clp)
392{
393 struct nfs4_stateowner *sop;
394 struct nfs4_delegation *dp;
1da177e4
LT		 395 struct list_head reaplist;
396
397 dprintk("NFSD: expire_client cl_count %d\n",
398 atomic_read(&clp->cl_count));
399
1da177e4
LT		 400 INIT_LIST_HEAD(&reaplist);
401 spin_lock(&recall_lock);
ea1da636
N		 402 while (!list_empty(&clp->cl_delegations)) {
403 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 404 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
405 dp->dl_flock);
ea1da636 406 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 407 list_move(&dp->dl_recall_lru, &reaplist);
408 }
409 spin_unlock(&recall_lock);
410 while (!list_empty(&reaplist)) {
411 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
412 list_del_init(&dp->dl_recall_lru);
413 unhash_delegation(dp);
414 }
415 list_del(&clp->cl_idhash);
416 list_del(&clp->cl_strhash);
417 list_del(&clp->cl_lru);
ea1da636
N		 418 while (!list_empty(&clp->cl_openowners)) {
419 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 420 release_stateowner(sop);
421 }
422 put_nfs4_client(clp);
423}
424
425static struct nfs4_client *
a55370a3 426create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 427 struct nfs4_client *clp;
428
429 if (!(clp = alloc_client(name)))
430 goto out;
a55370a3 431 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 432 atomic_set(&clp->cl_count, 1);
433 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 434 INIT_LIST_HEAD(&clp->cl_idhash);
435 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 436 INIT_LIST_HEAD(&clp->cl_openowners);
437 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 438 INIT_LIST_HEAD(&clp->cl_lru);
439out:
440 return clp;
441}
442
443static void
444copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
445 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
446}
447
448static void
449copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
450 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
451 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
452}
453
454static void
455copy_cred(struct svc_cred *target, struct svc_cred *source) {
456
457 target->cr_uid = source->cr_uid;
458 target->cr_gid = source->cr_gid;
459 target->cr_group_info = source->cr_group_info;
460 get_group_info(target->cr_group_info);
461}
462
a55370a3 463static inline int
599e0a22
BF		 464same_name(const char *n1, const char *n2)
465{
a55370a3 466 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 467}
468
469static int
599e0a22
BF		 470same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
471{
472 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 473}
474
475static int
599e0a22
BF		 476same_clid(clientid_t *cl1, clientid_t *cl2)
477{
478 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 479}
480
481/* XXX what about NGROUP */
482static int
599e0a22
BF		 483same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
484{
485 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 486}
487
488static void
489gen_clid(struct nfs4_client *clp) {
490 clp->cl_clientid.cl_boot = boot_time;
491 clp->cl_clientid.cl_id = current_clientid++;
492}
493
494static void
495gen_confirm(struct nfs4_client *clp) {
496 struct timespec tv;
497 u32 * p;
498
499 tv = CURRENT_TIME;
500 p = (u32 *)clp->cl_confirm.data;
501 *p++ = tv.tv_sec;
502 *p++ = tv.tv_nsec;
503}
504
505static int
506check_name(struct xdr_netobj name) {
507
508 if (name.len == 0)
509 return 0;
510 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 511 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 512 return 0;
513 }
514 return 1;
515}
516
fd39ca9a 517static void
1da177e4
LT		 518add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
519{
520 unsigned int idhashval;
521
522 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
523 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
524 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
525 list_add_tail(&clp->cl_lru, &client_lru);
526 clp->cl_time = get_seconds();
527}
528
fd39ca9a 529static void
1da177e4
LT		 530move_to_confirmed(struct nfs4_client *clp)
531{
532 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
533 unsigned int strhashval;
534
535 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
536 list_del_init(&clp->cl_strhash);
f116629d 537 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 538 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 539 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
540 renew_client(clp);
541}
542
543static struct nfs4_client *
544find_confirmed_client(clientid_t *clid)
545{
546 struct nfs4_client *clp;
547 unsigned int idhashval = clientid_hashval(clid->cl_id);
548
549 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 550 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 551 return clp;
552 }
553 return NULL;
554}
555
556static struct nfs4_client *
557find_unconfirmed_client(clientid_t *clid)
558{
559 struct nfs4_client *clp;
560 unsigned int idhashval = clientid_hashval(clid->cl_id);
561
562 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 563 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 564 return clp;
565 }
566 return NULL;
567}
568
28ce6054
N		 569static struct nfs4_client *
570find_confirmed_client_by_str(const char *dname, unsigned int hashval)
571{
572 struct nfs4_client *clp;
573
574 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
575 if (same_name(clp->cl_recdir, dname))
576 return clp;
577 }
578 return NULL;
579}
580
581static struct nfs4_client *
582find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
583{
584 struct nfs4_client *clp;
585
586 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
587 if (same_name(clp->cl_recdir, dname))
588 return clp;
589 }
590 return NULL;
591}
592
1da177e4
LT		 593/* a helper function for parse_callback */
594static int
595parse_octet(unsigned int *lenp, char **addrp)
596{
597 unsigned int len = *lenp;
598 char *p = *addrp;
599 int n = -1;
600 char c;
601
602 for (;;) {
603 if (!len)
604 break;
605 len--;
606 c = *p++;
607 if (c == '.')
608 break;
609 if ((c < '0') || (c > '9')) {
610 n = -1;
611 break;
612 }
613 if (n < 0)
614 n = 0;
615 n = (n * 10) + (c - '0');
616 if (n > 255) {
617 n = -1;
618 break;
619 }
620 }
621 *lenp = len;
622 *addrp = p;
623 return n;
624}
625
626/* parse and set the setclientid ipv4 callback address */
fd39ca9a 627static int
1da177e4
LT		 628parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
629{
630 int temp = 0;
631 u32 cbaddr = 0;
632 u16 cbport = 0;
633 u32 addrlen = addr_len;
634 char *addr = addr_val;
635 int i, shift;
636
637 /* ipaddress */
638 shift = 24;
639 for(i = 4; i > 0 ; i--) {
640 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
641 return 0;
642 }
643 cbaddr |= (temp << shift);
644 if (shift > 0)
645 shift -= 8;
646 }
647 *cbaddrp = cbaddr;
648
649 /* port */
650 shift = 8;
651 for(i = 2; i > 0 ; i--) {
652 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
653 return 0;
654 }
655 cbport |= (temp << shift);
656 if (shift > 0)
657 shift -= 8;
658 }
659 *cbportp = cbport;
660 return 1;
661}
662
fd39ca9a 663static void
1da177e4
LT		 664gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
665{
666 struct nfs4_callback *cb = &clp->cl_callback;
667
668 /* Currently, we only support tcp for the callback channel */
669 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
670 goto out_err;
671
672 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
673 &cb->cb_addr, &cb->cb_port)))
674 goto out_err;
675 cb->cb_prog = se->se_callback_prog;
676 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 677 return;
678out_err:
849823c5 679 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 680 "will not receive delegations\n",
681 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
682
1da177e4
LT		 683 return;
684}
685
686/*
687 * RFC 3010 has a complex implmentation description of processing a
688 * SETCLIENTID request consisting of 5 bullets, labeled as
689 * CASE0 - CASE4 below.
690 *
691 * NOTES:
692 * callback information will be processed in a future patch
693 *
694 * an unconfirmed record is added when:
695 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
696 * CASE 1: confirmed record found with matching name, principal,
697 * verifier, and clientid.
698 * CASE 2: confirmed record found with matching name, principal,
699 * and there is no unconfirmed record with matching
700 * name and principal
701 *
702 * an unconfirmed record is replaced when:
703 * CASE 3: confirmed record found with matching name, principal,
704 * and an unconfirmed record is found with matching
705 * name, principal, and with clientid and
706 * confirm that does not match the confirmed record.
707 * CASE 4: there is no confirmed record with matching name and
708 * principal. there is an unconfirmed record with
709 * matching name, principal.
710 *
711 * an unconfirmed record is deleted when:
712 * CASE 1: an unconfirmed record that matches input name, verifier,
713 * and confirmed clientid.
714 * CASE 4: any unconfirmed records with matching name and principal
715 * that exist after an unconfirmed record has been replaced
716 * as described above.
717 *
718 */
b37ad28b 719__be32
b591480b
BF		 720nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
721 struct nfsd4_setclientid *setclid)
1da177e4 722{
27459f09 723 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 724 struct xdr_netobj clname = {
725 .len = setclid->se_namelen,
726 .data = setclid->se_name,
727 };
728 nfs4_verifier clverifier = setclid->se_verf;
729 unsigned int strhashval;
28ce6054 730 struct nfs4_client *conf, *unconf, *new;
b37ad28b 731 __be32 status;
a55370a3 732 char dname[HEXDIR_LEN];
1da177e4 733
1da177e4 734 if (!check_name(clname))
73aea4ec 735 return nfserr_inval;
1da177e4 736
a55370a3
N		 737 status = nfs4_make_rec_clidname(dname, &clname);
738 if (status)
73aea4ec 739 return status;
a55370a3 740
1da177e4
LT		 741 /*
742 * XXX The Duplicate Request Cache (DRC) has been checked (??)
743 * We get here on a DRC miss.
744 */
745
a55370a3 746 strhashval = clientstr_hashval(dname);
1da177e4 747
1da177e4 748 nfs4_lock_state();
28ce6054
N		 749 conf = find_confirmed_client_by_str(dname, strhashval);
750 if (conf) {
1da177e4
LT		 751 /*
752 * CASE 0:
753 * clname match, confirmed, different principal
754 * or different ip_address
755 */
756 status = nfserr_clid_inuse;
599e0a22 757 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 758 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 759 dprintk("NFSD: setclientid: string in use by client"
760 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 761 goto out;
762 }
1da177e4 763 }
28ce6054 764 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 765 status = nfserr_resource;
766 if (!conf) {
767 /*
768 * CASE 4:
769 * placed first, because it is the normal case.
770 */
771 if (unconf)
772 expire_client(unconf);
a55370a3
N		 773 new = create_client(clname, dname);
774 if (new == NULL)
1da177e4 775 goto out;
1da177e4 776 gen_clid(new);
599e0a22 777 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4
LT		 778 /*
779 * CASE 1:
780 * cl_name match, confirmed, principal match
781 * verifier match: probable callback update
782 *
783 * remove any unconfirmed nfs4_client with
784 * matching cl_name, cl_verifier, and cl_clientid
785 *
786 * create and insert an unconfirmed nfs4_client with same
787 * cl_name, cl_verifier, and cl_clientid as existing
788 * nfs4_client, but with the new callback info and a
789 * new cl_confirm
790 */
31f4a6c1
N		 791 if (unconf) {
792 /* Note this is removing unconfirmed {*x***},
793 * which is stronger than RFC recommended {vxc**}.
794 * This has the advantage that there is at most
795 * one {*x***} in either list at any time.
796 */
797 expire_client(unconf);
1da177e4 798 }
a55370a3
N		 799 new = create_client(clname, dname);
800 if (new == NULL)
1da177e4 801 goto out;
1da177e4 802 copy_clid(new, conf);
1da177e4
LT		 803 } else if (!unconf) {
804 /*
805 * CASE 2:
806 * clname match, confirmed, principal match
807 * verfier does not match
808 * no unconfirmed. create a new unconfirmed nfs4_client
809 * using input clverifier, clname, and callback info
810 * and generate a new cl_clientid and cl_confirm.
811 */
a55370a3
N		 812 new = create_client(clname, dname);
813 if (new == NULL)
1da177e4 814 goto out;
1da177e4 815 gen_clid(new);
599e0a22 816 } else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
1da177e4
LT		 817 /*
818 * CASE3:
819 * confirmed found (name, principal match)
820 * confirmed verifier does not match input clverifier
821 *
822 * unconfirmed found (name match)
823 * confirmed->cl_confirm != unconfirmed->cl_confirm
824 *
825 * remove unconfirmed.
826 *
827 * create an unconfirmed nfs4_client
828 * with same cl_name as existing confirmed nfs4_client,
829 * but with new callback info, new cl_clientid,
830 * new cl_verifier and a new cl_confirm
831 */
832 expire_client(unconf);
a55370a3
N		 833 new = create_client(clname, dname);
834 if (new == NULL)
1da177e4 835 goto out;
1da177e4 836 gen_clid(new);
1da177e4
LT		 837 } else {
838 /* No cases hit !!! */
839 status = nfserr_inval;
840 goto out;
841
842 }
c175b83c
BF		 843 copy_verf(new, &clverifier);
844 new->cl_addr = sin->sin_addr.s_addr;
845 copy_cred(&new->cl_cred, &rqstp->rq_cred);
846 gen_confirm(new);
847 gen_callback(new, setclid);
848 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 849 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
850 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
851 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
852 status = nfs_ok;
853out:
854 nfs4_unlock_state();
855 return status;
856}
857
858
859/*
860 * RFC 3010 has a complex implmentation description of processing a
861 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
862 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
863 *
864 * NOTE: callback information will be processed here in a future patch
865 */
b37ad28b 866__be32
b591480b
BF		 867nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
868 struct nfsd4_compound_state *cstate,
869 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 870{
27459f09 871 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 872 struct nfs4_client *conf, *unconf;
1da177e4
LT		 873 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
874 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 875 __be32 status;
1da177e4
LT		 876
877 if (STALE_CLIENTID(clid))
878 return nfserr_stale_clientid;
879 /*
880 * XXX The Duplicate Request Cache (DRC) has been checked (??)
881 * We get here on a DRC miss.
882 */
883
884 nfs4_lock_state();
21ab45a4
N		 885
886 conf = find_confirmed_client(clid);
887 unconf = find_unconfirmed_client(clid);
888
889 status = nfserr_clid_inuse;
27459f09 890 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 891 goto out;
27459f09 892 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 893 goto out;
894
1da177e4 895 if ((conf && unconf) &&
599e0a22
BF		 896 (same_verf(&unconf->cl_confirm, &confirm)) &&
897 (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 898 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
599e0a22 899 (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 900 /* CASE 1:
901 * unconf record that matches input clientid and input confirm.
902 * conf record that matches input clientid.
903 * conf and unconf records match names, verifiers
904 */
599e0a22 905 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 906 status = nfserr_clid_inuse;
907 else {
1a69c179
N		 908 /* XXX: We just turn off callbacks until we can handle
909 * change request correctly. */
cb36d634 910 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 911 gen_confirm(conf);
46309029 912 nfsd4_remove_clid_dir(unconf);
1a69c179 913 expire_client(unconf);
1da177e4 914 status = nfs_ok;
1a69c179 915
1da177e4 916 }
7c79f737 917 } else if ((conf && !unconf) ||
1da177e4 918 ((conf && unconf) &&
599e0a22 919 (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 920 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 921 /* CASE 2:
922 * conf record that matches input clientid.
923 * if unconf record matches input clientid, then
924 * unconf->cl_name or unconf->cl_verifier don't match the
925 * conf record.
926 */
599e0a22 927 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 928 status = nfserr_clid_inuse;
21ab45a4 929 else
1da177e4 930 status = nfs_ok;
7c79f737 931 } else if (!conf && unconf
599e0a22 932 && same_verf(&unconf->cl_confirm, &confirm)) {
7c79f737
N		 933 /* CASE 3:
934 * conf record not found.
935 * unconf record found.
936 * unconf->cl_confirm matches input confirm
937 */
599e0a22 938 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 939 status = nfserr_clid_inuse;
940 } else {
1a69c179
N		 941 unsigned int hash =
942 clientstr_hashval(unconf->cl_recdir);
943 conf = find_confirmed_client_by_str(unconf->cl_recdir,
944 hash);
945 if (conf) {
c7b9a459 946 nfsd4_remove_clid_dir(conf);
1a69c179
N		 947 expire_client(conf);
948 }
1da177e4 949 move_to_confirmed(unconf);
21ab45a4 950 conf = unconf;
46f8a64b 951 nfsd4_probe_callback(conf);
1a69c179 952 status = nfs_ok;
1da177e4 953 }
599e0a22
BF		 954 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
955 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737
N		 956 &confirm)))) {
957 /* CASE 4:
958 * conf record not found, or if conf, conf->cl_confirm does not
959 * match input confirm.
960 * unconf record not found, or if unconf, unconf->cl_confirm
961 * does not match input confirm.
962 */
1da177e4 963 status = nfserr_stale_clientid;
7c79f737 964 } else {
08e8987c
N		 965 /* check that we have hit one of the cases...*/
966 status = nfserr_clid_inuse;
967 }
1da177e4 968out:
1da177e4
LT		 969 nfs4_unlock_state();
970 return status;
971}
972
1da177e4
LT		 973/* OPEN Share state helper functions */
974static inline struct nfs4_file *
975alloc_init_file(struct inode *ino)
976{
977 struct nfs4_file *fp;
978 unsigned int hashval = file_hashval(ino);
979
e60d4398
N		 980 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
981 if (fp) {
13cd2184 982 kref_init(&fp->fi_ref);
1da177e4 983 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 984 INIT_LIST_HEAD(&fp->fi_stateids);
985 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 986 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
987 fp->fi_inode = igrab(ino);
988 fp->fi_id = current_fileid++;
47f9940c 989 fp->fi_had_conflict = false;
1da177e4
LT		 990 return fp;
991 }
992 return NULL;
993}
994
e60d4398 995static void
e18b890b 996nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 997{
e60d4398
N		 998 if (*slab == NULL)
999 return;
1a1d92c1 1000 kmem_cache_destroy(*slab);
e60d4398 1001 *slab = NULL;
1da177e4
LT		 1002}
1003
e8ff2a84 1004void
1da177e4
LT		 1005nfsd4_free_slabs(void)
1006{
e60d4398
N		 1007 nfsd4_free_slab(&stateowner_slab);
1008 nfsd4_free_slab(&file_slab);
5ac049ac 1009 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1010 nfsd4_free_slab(&deleg_slab);
e60d4398 1011}
1da177e4 1012
e60d4398
N		 1013static int
1014nfsd4_init_slabs(void)
1015{
1016 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1017 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1018 if (stateowner_slab == NULL)
1019 goto out_nomem;
1020 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1021 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1022 if (file_slab == NULL)
1023 goto out_nomem;
5ac049ac 1024 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1025 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1026 if (stateid_slab == NULL)
1027 goto out_nomem;
5b2d21c1 1028 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1029 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1030 if (deleg_slab == NULL)
1031 goto out_nomem;
e60d4398
N		 1032 return 0;
1033out_nomem:
1034 nfsd4_free_slabs();
1035 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1036 return -ENOMEM;
1da177e4
LT		 1037}
1038
1039void
1040nfs4_free_stateowner(struct kref *kref)
1041{
1042 struct nfs4_stateowner *sop =
1043 container_of(kref, struct nfs4_stateowner, so_ref);
1044 kfree(sop->so_owner.data);
1045 kmem_cache_free(stateowner_slab, sop);
1046}
1047
1048static inline struct nfs4_stateowner *
1049alloc_stateowner(struct xdr_netobj *owner)
1050{
1051 struct nfs4_stateowner *sop;
1052
1053 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1054 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1055 memcpy(sop->so_owner.data, owner->data, owner->len);
1056 sop->so_owner.len = owner->len;
1057 kref_init(&sop->so_ref);
1058 return sop;
1059 }
1060 kmem_cache_free(stateowner_slab, sop);
1061 }
1062 return NULL;
1063}
1064
1065static struct nfs4_stateowner *
1066alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1067 struct nfs4_stateowner *sop;
1068 struct nfs4_replay *rp;
1069 unsigned int idhashval;
1070
1071 if (!(sop = alloc_stateowner(&open->op_owner)))
1072 return NULL;
1073 idhashval = ownerid_hashval(current_ownerid);
1074 INIT_LIST_HEAD(&sop->so_idhash);
1075 INIT_LIST_HEAD(&sop->so_strhash);
1076 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1077 INIT_LIST_HEAD(&sop->so_stateids);
1078 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1079 INIT_LIST_HEAD(&sop->so_close_lru);
1080 sop->so_time = 0;
1081 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1082 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1083 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1084 sop->so_is_open_owner = 1;
1085 sop->so_id = current_ownerid++;
1086 sop->so_client = clp;
1087 sop->so_seqid = open->op_seqid;
1088 sop->so_confirmed = 0;
1089 rp = &sop->so_replay;
de1ae286 1090 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1091 rp->rp_buflen = 0;
1092 rp->rp_buf = rp->rp_ibuf;
1093 return sop;
1094}
1095
1096static void
1097release_stateid_lockowners(struct nfs4_stateid *open_stp)
1098{
1099 struct nfs4_stateowner *lock_sop;
1100
ea1da636
N		 1101 while (!list_empty(&open_stp->st_lockowners)) {
1102 lock_sop = list_entry(open_stp->st_lockowners.next,
1103 struct nfs4_stateowner, so_perstateid);
1104 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1105 BUG_ON(lock_sop->so_is_open_owner);
1106 release_stateowner(lock_sop);
1107 }
1108}
1109
1110static void
1111unhash_stateowner(struct nfs4_stateowner *sop)
1112{
1113 struct nfs4_stateid *stp;
1114
1115 list_del(&sop->so_idhash);
1116 list_del(&sop->so_strhash);
6fa305de 1117 if (sop->so_is_open_owner)
1da177e4 1118 list_del(&sop->so_perclient);
ea1da636
N		 1119 list_del(&sop->so_perstateid);
1120 while (!list_empty(&sop->so_stateids)) {
1121 stp = list_entry(sop->so_stateids.next,
1122 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1123 if (sop->so_is_open_owner)
1124 release_stateid(stp, OPEN_STATE);
1125 else
1126 release_stateid(stp, LOCK_STATE);
1127 }
1128}
1129
1130static void
1131release_stateowner(struct nfs4_stateowner *sop)
1132{
1133 unhash_stateowner(sop);
1134 list_del(&sop->so_close_lru);
1135 nfs4_put_stateowner(sop);
1136}
1137
1138static inline void
1139init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1140 struct nfs4_stateowner *sop = open->op_stateowner;
1141 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1142
1143 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1144 INIT_LIST_HEAD(&stp->st_perstateowner);
1145 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1146 INIT_LIST_HEAD(&stp->st_perfile);
1147 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1148 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1149 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1150 stp->st_stateowner = sop;
13cd2184 1151 get_nfs4_file(fp);
1da177e4
LT		 1152 stp->st_file = fp;
1153 stp->st_stateid.si_boot = boot_time;
1154 stp->st_stateid.si_stateownerid = sop->so_id;
1155 stp->st_stateid.si_fileid = fp->fi_id;
1156 stp->st_stateid.si_generation = 0;
1157 stp->st_access_bmap = 0;
1158 stp->st_deny_bmap = 0;
1159 __set_bit(open->op_share_access, &stp->st_access_bmap);
1160 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1161 stp->st_openstp = NULL;
1da177e4
LT		 1162}
1163
1164static void
1165release_stateid(struct nfs4_stateid *stp, int flags)
1166{
1167 struct file *filp = stp->st_vfs_file;
1168
1169 list_del(&stp->st_hash);
1da177e4 1170 list_del(&stp->st_perfile);
ea1da636 1171 list_del(&stp->st_perstateowner);
1da177e4
LT		 1172 if (flags & OPEN_STATE) {
1173 release_stateid_lockowners(stp);
1174 stp->st_vfs_file = NULL;
1175 nfsd_close(filp);
1da177e4
LT		 1176 } else if (flags & LOCK_STATE)
1177 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1178 put_nfs4_file(stp->st_file);
5ac049ac 1179 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1180}
1181
fd39ca9a 1182static void
1da177e4
LT		 1183move_to_close_lru(struct nfs4_stateowner *sop)
1184{
1185 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1186
358dd55a 1187 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1188 sop->so_time = get_seconds();
1189}
1190
1da177e4 1191static int
599e0a22
BF		 1192same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1193 clientid_t *clid)
1194{
1195 return (sop->so_owner.len == owner->len) &&
1196 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1197 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1198}
1199
1200static struct nfs4_stateowner *
1201find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1202{
1203 struct nfs4_stateowner *so = NULL;
1204
1205 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1206 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1207 return so;
1208 }
1209 return NULL;
1210}
1211
1212/* search file_hashtbl[] for file */
1213static struct nfs4_file *
1214find_file(struct inode *ino)
1215{
1216 unsigned int hashval = file_hashval(ino);
1217 struct nfs4_file *fp;
1218
1219 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1220 if (fp->fi_inode == ino) {
1221 get_nfs4_file(fp);
1da177e4 1222 return fp;
13cd2184 1223 }
1da177e4
LT		 1224 }
1225 return NULL;
1226}
1227
ba5a6a19
BF		 1228static int access_valid(u32 x)
1229{
1230 return (x > 0 && x < 4);
1231}
1232
1233static int deny_valid(u32 x)
1234{
1235 return (x >= 0 && x < 5);
1236}
1da177e4 1237
fd39ca9a 1238static void
1da177e4
LT		 1239set_access(unsigned int *access, unsigned long bmap) {
1240 int i;
1241
1242 *access = 0;
1243 for (i = 1; i < 4; i++) {
1244 if (test_bit(i, &bmap))
1245 *access |= i;
1246 }
1247}
1248
fd39ca9a 1249static void
1da177e4
LT		 1250set_deny(unsigned int *deny, unsigned long bmap) {
1251 int i;
1252
1253 *deny = 0;
1254 for (i = 0; i < 4; i++) {
1255 if (test_bit(i, &bmap))
1256 *deny |= i ;
1257 }
1258}
1259
1260static int
1261test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1262 unsigned int access, deny;
1263
1264 set_access(&access, stp->st_access_bmap);
1265 set_deny(&deny, stp->st_deny_bmap);
1266 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1267 return 0;
1268 return 1;
1269}
1270
1271/*
1272 * Called to check deny when READ with all zero stateid or
1273 * WRITE with all zero or all one stateid
1274 */
b37ad28b 1275static __be32
1da177e4
LT		 1276nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1277{
1278 struct inode *ino = current_fh->fh_dentry->d_inode;
1279 struct nfs4_file *fp;
1280 struct nfs4_stateid *stp;
b37ad28b 1281 __be32 ret;
1da177e4
LT		 1282
1283 dprintk("NFSD: nfs4_share_conflict\n");
1284
1285 fp = find_file(ino);
13cd2184
N		 1286 if (!fp)
1287 return nfs_ok;
b700949b 1288 ret = nfserr_locked;
1da177e4 1289 /* Search for conflicting share reservations */
13cd2184
N		 1290 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1291 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1292 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1293 goto out;
1da177e4 1294 }
13cd2184
N		 1295 ret = nfs_ok;
1296out:
1297 put_nfs4_file(fp);
1298 return ret;
1da177e4
LT		 1299}
1300
1301static inline void
1302nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1303{
1304 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1305 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1306 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1307 }
1308}
1309
1310/*
1311 * Recall a delegation
1312 */
1313static int
1314do_recall(void *__dp)
1315{
1316 struct nfs4_delegation *dp = __dp;
1317
47f9940c 1318 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1319 nfsd4_cb_recall(dp);
1320 return 0;
1321}
1322
1323/*
1324 * Spawn a thread to perform a recall on the delegation represented
1325 * by the lease (file_lock)
1326 *
1327 * Called from break_lease() with lock_kernel() held.
1328 * Note: we assume break_lease will only call this *once* for any given
1329 * lease.
1330 */
1331static
1332void nfsd_break_deleg_cb(struct file_lock *fl)
1333{
1334 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1335 struct task_struct *t;
1336
1337 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1338 if (!dp)
1339 return;
1340
1341 /* We're assuming the state code never drops its reference
1342 * without first removing the lease. Since we're in this lease
1343 * callback (and since the lease code is serialized by the kernel
1344 * lock) we know the server hasn't removed the lease yet, we know
1345 * it's safe to take a reference: */
1346 atomic_inc(&dp->dl_count);
cfdcad4d 1347 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1348
1349 spin_lock(&recall_lock);
1350 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1351 spin_unlock(&recall_lock);
1352
1353 /* only place dl_time is set. protected by lock_kernel*/
1354 dp->dl_time = get_seconds();
1355
0272e1fd
BF		 1356 /*
1357 * We don't want the locks code to timeout the lease for us;
1358 * we'll remove it ourself if the delegation isn't returned
1359 * in time.
1360 */
1361 fl->fl_break_time = 0;
1da177e4
LT		 1362
1363 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1364 if (IS_ERR(t)) {
1365 struct nfs4_client *clp = dp->dl_client;
1366
1367 printk(KERN_INFO "NFSD: Callback thread failed for "
1368 "for client (clientid %08x/%08x)\n",
1369 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1370 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1371 nfs4_put_delegation(dp);
1372 }
1373}
1374
1375/*
1376 * The file_lock is being reapd.
1377 *
1378 * Called by locks_free_lock() with lock_kernel() held.
1379 */
1380static
1381void nfsd_release_deleg_cb(struct file_lock *fl)
1382{
1383 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1384
1385 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1386
1387 if (!(fl->fl_flags & FL_LEASE) || !dp)
1388 return;
1389 dp->dl_flock = NULL;
1390}
1391
1392/*
1393 * Set the delegation file_lock back pointer.
1394 *
a9933cea 1395 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1396 */
1397static
1398void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1399{
1400 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1401
1402 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1403 if (!dp)
1404 return;
1405 dp->dl_flock = new;
1406}
1407
1408/*
a9933cea 1409 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1410 */
1411static
1412int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1413{
1414 struct nfs4_delegation *onlistd =
1415 (struct nfs4_delegation *)onlist->fl_owner;
1416 struct nfs4_delegation *tryd =
1417 (struct nfs4_delegation *)try->fl_owner;
1418
1419 if (onlist->fl_lmops != try->fl_lmops)
1420 return 0;
1421
1422 return onlistd->dl_client == tryd->dl_client;
1423}
1424
1425
1426static
1427int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1428{
1429 if (arg & F_UNLCK)
1430 return lease_modify(onlist, arg);
1431 else
1432 return -EAGAIN;
1433}
1434
fd39ca9a 1435static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1436 .fl_break = nfsd_break_deleg_cb,
1437 .fl_release_private = nfsd_release_deleg_cb,
1438 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1439 .fl_mylease = nfsd_same_client_deleg_cb,
1440 .fl_change = nfsd_change_deleg_cb,
1441};
1442
1443
b37ad28b 1444__be32
1da177e4
LT		 1445nfsd4_process_open1(struct nfsd4_open *open)
1446{
1da177e4
LT		 1447 clientid_t *clientid = &open->op_clientid;
1448 struct nfs4_client *clp = NULL;
1449 unsigned int strhashval;
1450 struct nfs4_stateowner *sop = NULL;
1451
1da177e4 1452 if (!check_name(open->op_owner))
0f442aa2 1453 return nfserr_inval;
1da177e4
LT		 1454
1455 if (STALE_CLIENTID(&open->op_clientid))
1456 return nfserr_stale_clientid;
1457
1458 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1459 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1460 open->op_stateowner = sop;
1461 if (!sop) {
1462 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1463 clp = find_confirmed_client(clientid);
1464 if (clp == NULL)
0f442aa2
BF		 1465 return nfserr_expired;
1466 goto renew;
1da177e4 1467 }
0f442aa2
BF		 1468 if (!sop->so_confirmed) {
1469 /* Replace unconfirmed owners without checking for replay. */
1470 clp = sop->so_client;
1471 release_stateowner(sop);
1472 open->op_stateowner = NULL;
1473 goto renew;
1474 }
1475 if (open->op_seqid == sop->so_seqid - 1) {
1476 if (sop->so_replay.rp_buflen)
a90b061c 1477 return nfserr_replay_me;
0f442aa2
BF		 1478 /* The original OPEN failed so spectacularly
1479 * that we don't even have replay data saved!
1480 * Therefore, we have no choice but to continue
1481 * processing this OPEN; presumably, we'll
1482 * fail again for the same reason.
1483 */
1484 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1485 goto renew;
1486 }
1487 if (open->op_seqid != sop->so_seqid)
1488 return nfserr_bad_seqid;
1da177e4 1489renew:
0f442aa2
BF		 1490 if (open->op_stateowner == NULL) {
1491 sop = alloc_init_open_stateowner(strhashval, clp, open);
1492 if (sop == NULL)
1493 return nfserr_resource;
1494 open->op_stateowner = sop;
1495 }
1496 list_del_init(&sop->so_close_lru);
1da177e4 1497 renew_client(sop->so_client);
0f442aa2 1498 return nfs_ok;
1da177e4
LT		 1499}
1500
b37ad28b 1501static inline __be32
4a6e43e6
N		 1502nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1503{
1504 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1505 return nfserr_openmode;
1506 else
1507 return nfs_ok;
1508}
1509
52f4fb43
N		 1510static struct nfs4_delegation *
1511find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1512{
1513 struct nfs4_delegation *dp;
1514
ea1da636 1515 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1516 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1517 return dp;
1518 }
1519 return NULL;
1520}
1521
b37ad28b 1522static __be32
567d9829
N		 1523nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1524 struct nfs4_delegation **dp)
1525{
1526 int flags;
b37ad28b 1527 __be32 status = nfserr_bad_stateid;
567d9829
N		 1528
1529 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1530 if (*dp == NULL)
c44c5eeb 1531 goto out;
567d9829
N		 1532 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1533 RD_STATE : WR_STATE;
1534 status = nfs4_check_delegmode(*dp, flags);
1535 if (status)
1536 *dp = NULL;
c44c5eeb
N		 1537out:
1538 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1539 return nfs_ok;
1540 if (status)
1541 return status;
1542 open->op_stateowner->so_confirmed = 1;
1543 return nfs_ok;
567d9829
N		 1544}
1545
b37ad28b 1546static __be32
1da177e4
LT		 1547nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1548{
1549 struct nfs4_stateid *local;
b37ad28b 1550 __be32 status = nfserr_share_denied;
1da177e4
LT		 1551 struct nfs4_stateowner *sop = open->op_stateowner;
1552
8beefa24 1553 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1554 /* ignore lock owners */
1555 if (local->st_stateowner->so_is_open_owner == 0)
1556 continue;
1557 /* remember if we have seen this open owner */
1558 if (local->st_stateowner == sop)
1559 *stpp = local;
1560 /* check for conflicting share reservations */
1561 if (!test_share(local, open))
1562 goto out;
1563 }
1564 status = 0;
1565out:
1566 return status;
1567}
1568
5ac049ac
N		 1569static inline struct nfs4_stateid *
1570nfs4_alloc_stateid(void)
1571{
1572 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1573}
1574
b37ad28b 1575static __be32
1da177e4 1576nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1577 struct nfs4_delegation *dp,
1da177e4
LT		 1578 struct svc_fh *cur_fh, int flags)
1579{
1580 struct nfs4_stateid *stp;
1da177e4 1581
5ac049ac 1582 stp = nfs4_alloc_stateid();
1da177e4
LT		 1583 if (stp == NULL)
1584 return nfserr_resource;
1585
567d9829
N		 1586 if (dp) {
1587 get_file(dp->dl_vfs_file);
1588 stp->st_vfs_file = dp->dl_vfs_file;
1589 } else {
b37ad28b 1590 __be32 status;
567d9829
N		 1591 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1592 &stp->st_vfs_file);
1593 if (status) {
1594 if (status == nfserr_dropit)
1595 status = nfserr_jukebox;
5ac049ac 1596 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1597 return status;
1598 }
1da177e4 1599 }
1da177e4
LT		 1600 *stpp = stp;
1601 return 0;
1602}
1603
b37ad28b 1604static inline __be32
1da177e4
LT		 1605nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1606 struct nfsd4_open *open)
1607{
1608 struct iattr iattr = {
1609 .ia_valid = ATTR_SIZE,
1610 .ia_size = 0,
1611 };
1612 if (!open->op_truncate)
1613 return 0;
1614 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1615 return nfserr_inval;
1da177e4
LT		 1616 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1617}
1618
b37ad28b 1619static __be32
1da177e4
LT		 1620nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1621{
1622 struct file *filp = stp->st_vfs_file;
7eaa36e2 1623 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1624 unsigned int share_access, new_writer;
b37ad28b 1625 __be32 status;
1da177e4
LT		 1626
1627 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1628 new_writer = (~share_access) & open->op_share_access
1629 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1630
6c26d08f 1631 if (new_writer) {
b37ad28b
AV		 1632 int err = get_write_access(inode);
1633 if (err)
1634 return nfserrno(err);
6c26d08f 1635 }
1da177e4
LT		 1636 status = nfsd4_truncate(rqstp, cur_fh, open);
1637 if (status) {
6c26d08f
BF		 1638 if (new_writer)
1639 put_write_access(inode);
1da177e4
LT		 1640 return status;
1641 }
1642 /* remember the open */
6c26d08f 1643 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1644 set_bit(open->op_share_access, &stp->st_access_bmap);
1645 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1646
1647 return nfs_ok;
1648}
1649
1650
1da177e4 1651static void
37515177 1652nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1653{
37515177
N		 1654 open->op_stateowner->so_confirmed = 1;
1655 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1656}
1657
1658/*
1659 * Attempt to hand out a delegation.
1660 */
1661static void
1662nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1663{
1664 struct nfs4_delegation *dp;
1665 struct nfs4_stateowner *sop = stp->st_stateowner;
1666 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1667 struct file_lock fl, *flp = &fl;
1668 int status, flag = 0;
1669
1670 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1671 open->op_recall = 0;
1672 switch (open->op_claim_type) {
1673 case NFS4_OPEN_CLAIM_PREVIOUS:
1674 if (!atomic_read(&cb->cb_set))
1675 open->op_recall = 1;
1676 flag = open->op_delegate_type;
1677 if (flag == NFS4_OPEN_DELEGATE_NONE)
1678 goto out;
1679 break;
1680 case NFS4_OPEN_CLAIM_NULL:
1681 /* Let's not give out any delegations till everyone's
1682 * had the chance to reclaim theirs.... */
1683 if (nfs4_in_grace())
1684 goto out;
1685 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1686 goto out;
1687 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1688 flag = NFS4_OPEN_DELEGATE_WRITE;
1689 else
1690 flag = NFS4_OPEN_DELEGATE_READ;
1691 break;
1692 default:
1693 goto out;
1694 }
1da177e4
LT		 1695
1696 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1697 if (dp == NULL) {
1698 flag = NFS4_OPEN_DELEGATE_NONE;
1699 goto out;
1700 }
1701 locks_init_lock(&fl);
1702 fl.fl_lmops = &nfsd_lease_mng_ops;
1703 fl.fl_flags = FL_LEASE;
1704 fl.fl_end = OFFSET_MAX;
1705 fl.fl_owner = (fl_owner_t)dp;
1706 fl.fl_file = stp->st_vfs_file;
1707 fl.fl_pid = current->tgid;
1708
a9933cea 1709 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1710 * the lock_manager callbacks fl_mylease and fl_change are used
1711 */
a9933cea 1712 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1713 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1714 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1715 unhash_delegation(dp);
1da177e4
LT		 1716 flag = NFS4_OPEN_DELEGATE_NONE;
1717 goto out;
1718 }
1719
1720 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1721
1722 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1723 dp->dl_stateid.si_boot,
1724 dp->dl_stateid.si_stateownerid,
1725 dp->dl_stateid.si_fileid,
1726 dp->dl_stateid.si_generation);
1727out:
7b190fec
N		 1728 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1729 && flag == NFS4_OPEN_DELEGATE_NONE
1730 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1731 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1732 open->op_delegate_type = flag;
1733}
1734
1735/*
1736 * called with nfs4_lock_state() held.
1737 */
b37ad28b 1738__be32
1da177e4
LT		 1739nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1740{
1741 struct nfs4_file *fp = NULL;
1742 struct inode *ino = current_fh->fh_dentry->d_inode;
1743 struct nfs4_stateid *stp = NULL;
567d9829 1744 struct nfs4_delegation *dp = NULL;
b37ad28b 1745 __be32 status;
1da177e4
LT		 1746
1747 status = nfserr_inval;
ba5a6a19
BF		 1748 if (!access_valid(open->op_share_access)
1749 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1750 goto out;
1751 /*
1752 * Lookup file; if found, lookup stateid and check open request,
1753 * and check for delegations in the process of being recalled.
1754 * If not found, create the nfs4_file struct
1755 */
1756 fp = find_file(ino);
1757 if (fp) {
1758 if ((status = nfs4_check_open(fp, open, &stp)))
1759 goto out;
c44c5eeb
N		 1760 status = nfs4_check_deleg(fp, open, &dp);
1761 if (status)
1762 goto out;
1da177e4 1763 } else {
c44c5eeb
N		 1764 status = nfserr_bad_stateid;
1765 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1766 goto out;
1da177e4
LT		 1767 status = nfserr_resource;
1768 fp = alloc_init_file(ino);
1769 if (fp == NULL)
1770 goto out;
1771 }
1772
1773 /*
1774 * OPEN the file, or upgrade an existing OPEN.
1775 * If truncate fails, the OPEN fails.
1776 */
1777 if (stp) {
1778 /* Stateid was found, this is an OPEN upgrade */
1779 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1780 if (status)
1781 goto out;
444c2c07 1782 update_stateid(&stp->st_stateid);
1da177e4
LT		 1783 } else {
1784 /* Stateid was not found, this is a new OPEN */
1785 int flags = 0;
9ecb6a08
BF		 1786 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1787 flags |= MAY_READ;
1da177e4 1788 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1789 flags |= MAY_WRITE;
567d9829
N		 1790 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1791 if (status)
1da177e4
LT		 1792 goto out;
1793 init_stateid(stp, fp, open);
1794 status = nfsd4_truncate(rqstp, current_fh, open);
1795 if (status) {
1796 release_stateid(stp, OPEN_STATE);
1797 goto out;
1798 }
1799 }
1800 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1801
1802 /*
1803 * Attempt to hand out a delegation. No error return, because the
1804 * OPEN succeeds even if we fail.
1805 */
1806 nfs4_open_delegation(current_fh, open, stp);
1807
1808 status = nfs_ok;
1809
1810 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1811 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1812 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1813out:
13cd2184
N		 1814 if (fp)
1815 put_nfs4_file(fp);
37515177
N		 1816 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1817 nfs4_set_claim_prev(open);
1da177e4
LT		 1818 /*
1819 * To finish the open response, we just need to set the rflags.
1820 */
1821 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1822 if (!open->op_stateowner->so_confirmed)
1823 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1824
1825 return status;
1826}
1827
58da282b 1828static struct workqueue_struct *laundry_wq;
c4028958
DH		 1829static void laundromat_main(struct work_struct *);
1830static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1831
b37ad28b 1832__be32
b591480b
BF		 1833nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1834 clientid_t *clid)
1da177e4
LT		 1835{
1836 struct nfs4_client *clp;
b37ad28b 1837 __be32 status;
1da177e4
LT		 1838
1839 nfs4_lock_state();
1840 dprintk("process_renew(%08x/%08x): starting\n",
1841 clid->cl_boot, clid->cl_id);
1842 status = nfserr_stale_clientid;
1843 if (STALE_CLIENTID(clid))
1844 goto out;
1845 clp = find_confirmed_client(clid);
1846 status = nfserr_expired;
1847 if (clp == NULL) {
1848 /* We assume the client took too long to RENEW. */
1849 dprintk("nfsd4_renew: clientid not found!\n");
1850 goto out;
1851 }
1852 renew_client(clp);
1853 status = nfserr_cb_path_down;
ea1da636 1854 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1855 && !atomic_read(&clp->cl_callback.cb_set))
1856 goto out;
1857 status = nfs_ok;
1858out:
1859 nfs4_unlock_state();
1860 return status;
1861}
1862
a76b4319
N		 1863static void
1864end_grace(void)
1865{
1866 dprintk("NFSD: end of grace period\n");
c7b9a459 1867 nfsd4_recdir_purge_old();
a76b4319
N		 1868 in_grace = 0;
1869}
1870
fd39ca9a 1871static time_t
1da177e4
LT		 1872nfs4_laundromat(void)
1873{
1874 struct nfs4_client *clp;
1875 struct nfs4_stateowner *sop;
1876 struct nfs4_delegation *dp;
1877 struct list_head *pos, *next, reaplist;
1878 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1879 time_t t, clientid_val = NFSD_LEASE_TIME;
1880 time_t u, test_val = NFSD_LEASE_TIME;
1881
1882 nfs4_lock_state();
1883
1884 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1885 if (in_grace)
1886 end_grace();
1da177e4
LT		 1887 list_for_each_safe(pos, next, &client_lru) {
1888 clp = list_entry(pos, struct nfs4_client, cl_lru);
1889 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1890 t = clp->cl_time - cutoff;
1891 if (clientid_val > t)
1892 clientid_val = t;
1893 break;
1894 }
1895 dprintk("NFSD: purging unused client (clientid %08x)\n",
1896 clp->cl_clientid.cl_id);
c7b9a459 1897 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1898 expire_client(clp);
1899 }
1900 INIT_LIST_HEAD(&reaplist);
1901 spin_lock(&recall_lock);
1902 list_for_each_safe(pos, next, &del_recall_lru) {
1903 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1904 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1905 u = dp->dl_time - cutoff;
1906 if (test_val > u)
1907 test_val = u;
1908 break;
1909 }
1910 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1911 dp, dp->dl_flock);
1912 list_move(&dp->dl_recall_lru, &reaplist);
1913 }
1914 spin_unlock(&recall_lock);
1915 list_for_each_safe(pos, next, &reaplist) {
1916 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1917 list_del_init(&dp->dl_recall_lru);
1918 unhash_delegation(dp);
1919 }
1920 test_val = NFSD_LEASE_TIME;
1921 list_for_each_safe(pos, next, &close_lru) {
1922 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1923 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1924 u = sop->so_time - cutoff;
1925 if (test_val > u)
1926 test_val = u;
1927 break;
1928 }
1929 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1930 sop->so_id);
358dd55a 1931 release_stateowner(sop);
1da177e4
LT		 1932 }
1933 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1934 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1935 nfs4_unlock_state();
1936 return clientid_val;
1937}
1938
1939void
c4028958 1940laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1941{
1942 time_t t;
1943
1944 t = nfs4_laundromat();
1945 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1946 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1947}
1948
fd39ca9a 1949static struct nfs4_stateowner *
f8816512
N		 1950search_close_lru(u32 st_id, int flags)
1951{
1da177e4
LT		 1952 struct nfs4_stateowner *local = NULL;
1953
1da177e4
LT		 1954 if (flags & CLOSE_STATE) {
1955 list_for_each_entry(local, &close_lru, so_close_lru) {
1956 if (local->so_id == st_id)
1957 return local;
1958 }
1959 }
1960 return NULL;
1961}
1962
1963static inline int
1964nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1965{
7eaa36e2 1966 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1967}
1968
1969static int
1970STALE_STATEID(stateid_t *stateid)
1971{
1972 if (stateid->si_boot == boot_time)
1973 return 0;
849823c5 1974 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1975 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1976 stateid->si_generation);
1977 return 1;
1978}
1979
1980static inline int
1981access_permit_read(unsigned long access_bmap)
1982{
1983 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1984 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1985 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1986}
1987
1988static inline int
1989access_permit_write(unsigned long access_bmap)
1990{
1991 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1992 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1993}
1994
1995static
b37ad28b 1996__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1997{
b37ad28b 1998 __be32 status = nfserr_openmode;
1da177e4
LT		 1999
2000 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2001 goto out;
2002 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2003 goto out;
2004 status = nfs_ok;
2005out:
2006 return status;
2007}
2008
b37ad28b 2009static inline __be32
1da177e4
LT		 2010check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2011{
2012 /* Trying to call delegreturn with a special stateid? Yuch: */
2013 if (!(flags & (RD_STATE | WR_STATE)))
2014 return nfserr_bad_stateid;
2015 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2016 return nfs_ok;
2017 else if (nfs4_in_grace()) {
2018 /* Answer in remaining cases depends on existance of
2019 * conflicting state; so we must wait out the grace period. */
2020 return nfserr_grace;
2021 } else if (flags & WR_STATE)
2022 return nfs4_share_conflict(current_fh,
2023 NFS4_SHARE_DENY_WRITE);
2024 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2025 return nfs4_share_conflict(current_fh,
2026 NFS4_SHARE_DENY_READ);
2027}
2028
2029/*
2030 * Allow READ/WRITE during grace period on recovered state only for files
2031 * that are not able to provide mandatory locking.
2032 */
2033static inline int
2034io_during_grace_disallowed(struct inode *inode, int flags)
2035{
2036 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 2037 && mandatory_lock(inode);
1da177e4
LT		 2038}
2039
2040/*
2041* Checks for stateid operations
2042*/
b37ad28b 2043__be32
1da177e4
LT		 2044nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2045{
2046 struct nfs4_stateid *stp = NULL;
2047 struct nfs4_delegation *dp = NULL;
2048 stateid_t *stidp;
2049 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2050 __be32 status;
1da177e4
LT		 2051
2052 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2053 stateid->si_boot, stateid->si_stateownerid,
2054 stateid->si_fileid, stateid->si_generation);
2055 if (filpp)
2056 *filpp = NULL;
2057
2058 if (io_during_grace_disallowed(ino, flags))
2059 return nfserr_grace;
2060
2061 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2062 return check_special_stateids(current_fh, stateid, flags);
2063
2064 /* STALE STATEID */
2065 status = nfserr_stale_stateid;
2066 if (STALE_STATEID(stateid))
2067 goto out;
2068
2069 /* BAD STATEID */
2070 status = nfserr_bad_stateid;
2071 if (!stateid->si_fileid) { /* delegation stateid */
2072 if(!(dp = find_delegation_stateid(ino, stateid))) {
2073 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2074 goto out;
2075 }
2076 stidp = &dp->dl_stateid;
2077 } else { /* open or lock stateid */
2078 if (!(stp = find_stateid(stateid, flags))) {
2079 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2080 goto out;
2081 }
2082 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2083 goto out;
2084 if (!stp->st_stateowner->so_confirmed)
2085 goto out;
2086 stidp = &stp->st_stateid;
2087 }
2088 if (stateid->si_generation > stidp->si_generation)
2089 goto out;
2090
2091 /* OLD STATEID */
2092 status = nfserr_old_stateid;
2093 if (stateid->si_generation < stidp->si_generation)
2094 goto out;
2095 if (stp) {
2096 if ((status = nfs4_check_openmode(stp,flags)))
2097 goto out;
2098 renew_client(stp->st_stateowner->so_client);
2099 if (filpp)
2100 *filpp = stp->st_vfs_file;
2101 } else if (dp) {
2102 if ((status = nfs4_check_delegmode(dp, flags)))
2103 goto out;
2104 renew_client(dp->dl_client);
2105 if (flags & DELEG_RET)
2106 unhash_delegation(dp);
2107 if (filpp)
2108 *filpp = dp->dl_vfs_file;
2109 }
2110 status = nfs_ok;
2111out:
2112 return status;
2113}
2114
4c4cd222
N		 2115static inline int
2116setlkflg (int type)
2117{
2118 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2119 RD_STATE : WR_STATE;
2120}
1da177e4
LT		 2121
2122/*
2123 * Checks for sequence id mutating operations.
2124 */
b37ad28b 2125static __be32
4c4cd222 2126nfs4_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 2127{
1da177e4
LT		 2128 struct nfs4_stateid *stp;
2129 struct nfs4_stateowner *sop;
2130
2131 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2132 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2133 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2134 stateid->si_generation);
3a4f98bb 2135
1da177e4
LT		 2136 *stpp = NULL;
2137 *sopp = NULL;
2138
1da177e4 2139 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2140 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2141 return nfserr_bad_stateid;
1da177e4
LT		 2142 }
2143
1da177e4 2144 if (STALE_STATEID(stateid))
3a4f98bb 2145 return nfserr_stale_stateid;
1da177e4
LT		 2146 /*
2147 * We return BAD_STATEID if filehandle doesn't match stateid,
2148 * the confirmed flag is incorrecly set, or the generation
2149 * number is incorrect.
1da177e4 2150 */
f8816512
N		 2151 stp = find_stateid(stateid, flags);
2152 if (stp == NULL) {
2153 /*
2154 * Also, we should make sure this isn't just the result of
2155 * a replayed close:
2156 */
2157 sop = search_close_lru(stateid->si_stateownerid, flags);
2158 if (sop == NULL)
2159 return nfserr_bad_stateid;
2160 *sopp = sop;
2161 goto check_replay;
2162 }
1da177e4 2163
4c4cd222 2164 if (lock) {
1da177e4 2165 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2166 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2167 struct nfs4_client *clp = sop->so_client;
4c4cd222 2168 int lkflg = 0;
b37ad28b 2169 __be32 status;
4c4cd222
N		 2170
2171 lkflg = setlkflg(lock->lk_type);
2172
2173 if (lock->lk_is_new) {
599e0a22
BF		 2174 if (!sop->so_is_open_owner)
2175 return nfserr_bad_stateid;
2176 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2177 return nfserr_bad_stateid;
599e0a22
BF		 2178 /* stp is the open stateid */
2179 status = nfs4_check_openmode(stp, lkflg);
2180 if (status)
2181 return status;
2182 } else {
2183 /* stp is the lock stateid */
2184 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2185 if (status)
2186 return status;
4c4cd222 2187 }
1da177e4
LT		 2188 }
2189
2190 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2fdada03 2191 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2192 return nfserr_bad_stateid;
1da177e4
LT		 2193 }
2194
2195 *stpp = stp;
2196 *sopp = sop = stp->st_stateowner;
2197
2198 /*
2199 * We now validate the seqid and stateid generation numbers.
2200 * For the moment, we ignore the possibility of
2201 * generation number wraparound.
2202 */
bd9aac52 2203 if (seqid != sop->so_seqid)
1da177e4
LT		 2204 goto check_replay;
2205
3a4f98bb 2206 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2207 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2208 " unconfirmed stateowner!\n");
2209 return nfserr_bad_stateid;
1da177e4 2210 }
3a4f98bb 2211 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2212 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2213 " confirmed yet!\n");
2214 return nfserr_bad_stateid;
1da177e4
LT		 2215 }
2216 if (stateid->si_generation > stp->st_stateid.si_generation) {
2fdada03 2217 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2218 return nfserr_bad_stateid;
1da177e4
LT		 2219 }
2220
1da177e4 2221 if (stateid->si_generation < stp->st_stateid.si_generation) {
2fdada03 2222 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2223 return nfserr_old_stateid;
1da177e4 2224 }
52fd004e 2225 renew_client(sop->so_client);
3a4f98bb 2226 return nfs_ok;
1da177e4 2227
1da177e4 2228check_replay:
bd9aac52 2229 if (seqid == sop->so_seqid - 1) {
849823c5 2230 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2231 /* indicate replay to calling function */
a90b061c 2232 return nfserr_replay_me;
1da177e4 2233 }
2fdada03 2234 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2235 sop->so_seqid, seqid);
2236 *sopp = NULL;
2237 return nfserr_bad_seqid;
1da177e4
LT		 2238}
2239
b37ad28b 2240__be32
ca364317 2241nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2242 struct nfsd4_open_confirm *oc)
1da177e4 2243{
b37ad28b 2244 __be32 status;
1da177e4
LT		 2245 struct nfs4_stateowner *sop;
2246 struct nfs4_stateid *stp;
2247
2248 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2249 (int)cstate->current_fh.fh_dentry->d_name.len,
2250 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2251
ca364317 2252 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2253 if (status)
2254 return status;
1da177e4
LT		 2255
2256 nfs4_lock_state();
2257
ca364317
BF		 2258 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2259 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2260 CHECK_FH | CONFIRM | OPEN_STATE,
2261 &oc->oc_stateowner, &stp, NULL)))
2262 goto out;
2263
2264 sop = oc->oc_stateowner;
2265 sop->so_confirmed = 1;
2266 update_stateid(&stp->st_stateid);
2267 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2268 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2269 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2270 stp->st_stateid.si_boot,
2271 stp->st_stateid.si_stateownerid,
2272 stp->st_stateid.si_fileid,
2273 stp->st_stateid.si_generation);
c7b9a459
N		 2274
2275 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2276out:
f2327d9a 2277 if (oc->oc_stateowner) {
1da177e4 2278 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2279 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2280 }
1da177e4
LT		 2281 nfs4_unlock_state();
2282 return status;
2283}
2284
2285
2286/*
2287 * unset all bits in union bitmap (bmap) that
2288 * do not exist in share (from successful OPEN_DOWNGRADE)
2289 */
2290static void
2291reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2292{
2293 int i;
2294 for (i = 1; i < 4; i++) {
2295 if ((i & access) != i)
2296 __clear_bit(i, bmap);
2297 }
2298}
2299
2300static void
2301reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2302{
2303 int i;
2304 for (i = 0; i < 4; i++) {
2305 if ((i & deny) != i)
2306 __clear_bit(i, bmap);
2307 }
2308}
2309
b37ad28b 2310__be32
ca364317
BF		 2311nfsd4_open_downgrade(struct svc_rqst *rqstp,
2312 struct nfsd4_compound_state *cstate,
a4f1706a 2313 struct nfsd4_open_downgrade *od)
1da177e4 2314{
b37ad28b 2315 __be32 status;
1da177e4
LT		 2316 struct nfs4_stateid *stp;
2317 unsigned int share_access;
2318
2319 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2320 (int)cstate->current_fh.fh_dentry->d_name.len,
2321 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2322
ba5a6a19
BF		 2323 if (!access_valid(od->od_share_access)
2324 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2325 return nfserr_inval;
2326
2327 nfs4_lock_state();
ca364317
BF		 2328 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2329 od->od_seqid,
1da177e4
LT		 2330 &od->od_stateid,
2331 CHECK_FH | OPEN_STATE,
2332 &od->od_stateowner, &stp, NULL)))
2333 goto out;
2334
2335 status = nfserr_inval;
2336 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2337 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2338 stp->st_access_bmap, od->od_share_access);
2339 goto out;
2340 }
2341 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2342 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2343 stp->st_deny_bmap, od->od_share_deny);
2344 goto out;
2345 }
2346 set_access(&share_access, stp->st_access_bmap);
2347 nfs4_file_downgrade(stp->st_vfs_file,
2348 share_access & ~od->od_share_access);
2349
2350 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2351 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2352
2353 update_stateid(&stp->st_stateid);
2354 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2355 status = nfs_ok;
2356out:
f2327d9a 2357 if (od->od_stateowner) {
1da177e4 2358 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2359 cstate->replay_owner = od->od_stateowner;
f2327d9a 2360 }
1da177e4
LT		 2361 nfs4_unlock_state();
2362 return status;
2363}
2364
2365/*
2366 * nfs4_unlock_state() called after encode
2367 */
b37ad28b 2368__be32
ca364317 2369nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2370 struct nfsd4_close *close)
1da177e4 2371{
b37ad28b 2372 __be32 status;
1da177e4
LT		 2373 struct nfs4_stateid *stp;
2374
2375 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2376 (int)cstate->current_fh.fh_dentry->d_name.len,
2377 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2378
2379 nfs4_lock_state();
2380 /* check close_lru for replay */
ca364317
BF		 2381 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2382 close->cl_seqid,
1da177e4
LT		 2383 &close->cl_stateid,
2384 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2385 &close->cl_stateowner, &stp, NULL)))
2386 goto out;
1da177e4
LT		 2387 status = nfs_ok;
2388 update_stateid(&stp->st_stateid);
2389 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2390
04ef5954
BF		 2391 /* release_stateid() calls nfsd_close() if needed */
2392 release_stateid(stp, OPEN_STATE);
2393
2394 /* place unused nfs4_stateowners on so_close_lru list to be
2395 * released by the laundromat service after the lease period
2396 * to enable us to handle CLOSE replay
2397 */
2398 if (list_empty(&close->cl_stateowner->so_stateids))
2399 move_to_close_lru(close->cl_stateowner);
1da177e4 2400out:
f2327d9a 2401 if (close->cl_stateowner) {
1da177e4 2402 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2403 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2404 }
1da177e4
LT		 2405 nfs4_unlock_state();
2406 return status;
2407}
2408
b37ad28b 2409__be32
ca364317
BF		 2410nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2411 struct nfsd4_delegreturn *dr)
1da177e4 2412{
b37ad28b 2413 __be32 status;
1da177e4 2414
ca364317 2415 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2416 goto out;
2417
2418 nfs4_lock_state();
ca364317
BF		 2419 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2420 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2421 nfs4_unlock_state();
2422out:
2423 return status;
2424}
2425
2426
2427/*
2428 * Lock owner state (byte-range locks)
2429 */
2430#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2431#define LOCK_HASH_BITS 8
2432#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2433#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2434
2435#define lockownerid_hashval(id) \
2436 ((id) & LOCK_HASH_MASK)
2437
2438static inline unsigned int
2439lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2440 struct xdr_netobj *ownername)
2441{
2442 return (file_hashval(inode) + cl_id
2443 + opaque_hashval(ownername->data, ownername->len))
2444 & LOCK_HASH_MASK;
2445}
2446
2447static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2448static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2449static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2450
fd39ca9a 2451static struct nfs4_stateid *
1da177e4
LT		 2452find_stateid(stateid_t *stid, int flags)
2453{
2454 struct nfs4_stateid *local = NULL;
2455 u32 st_id = stid->si_stateownerid;
2456 u32 f_id = stid->si_fileid;
2457 unsigned int hashval;
2458
2459 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2460 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2461 hashval = stateid_hashval(st_id, f_id);
2462 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2463 if ((local->st_stateid.si_stateownerid == st_id) &&
2464 (local->st_stateid.si_fileid == f_id))
2465 return local;
2466 }
2467 }
2468 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2469 hashval = stateid_hashval(st_id, f_id);
2470 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2471 if ((local->st_stateid.si_stateownerid == st_id) &&
2472 (local->st_stateid.si_fileid == f_id))
2473 return local;
2474 }
849823c5 2475 }
1da177e4
LT		 2476 return NULL;
2477}
2478
2479static struct nfs4_delegation *
2480find_delegation_stateid(struct inode *ino, stateid_t *stid)
2481{
13cd2184
N		 2482 struct nfs4_file *fp;
2483 struct nfs4_delegation *dl;
1da177e4
LT		 2484
2485 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2486 stid->si_boot, stid->si_stateownerid,
2487 stid->si_fileid, stid->si_generation);
2488
1da177e4 2489 fp = find_file(ino);
13cd2184
N		 2490 if (!fp)
2491 return NULL;
2492 dl = find_delegation_file(fp, stid);
2493 put_nfs4_file(fp);
2494 return dl;
1da177e4
LT		 2495}
2496
2497/*
2498 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2499 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2500 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2501 * locking, this prevents us from being completely protocol-compliant. The
2502 * real solution to this problem is to start using unsigned file offsets in
2503 * the VFS, but this is a very deep change!
2504 */
2505static inline void
2506nfs4_transform_lock_offset(struct file_lock *lock)
2507{
2508 if (lock->fl_start < 0)
2509 lock->fl_start = OFFSET_MAX;
2510 if (lock->fl_end < 0)
2511 lock->fl_end = OFFSET_MAX;
2512}
2513
d5b9026a
N		 2514/* Hack!: For now, we're defining this just so we can use a pointer to it
2515 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2516static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2517};
1da177e4
LT		 2518
2519static inline void
2520nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2521{
d5b9026a
N		 2522 struct nfs4_stateowner *sop;
2523 unsigned int hval;
1da177e4 2524
d5b9026a
N		 2525 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2526 sop = (struct nfs4_stateowner *) fl->fl_owner;
2527 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2528 kref_get(&sop->so_ref);
2529 deny->ld_sop = sop;
2530 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2531 } else {
2532 deny->ld_sop = NULL;
2533 deny->ld_clientid.cl_boot = 0;
2534 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2535 }
2536 deny->ld_start = fl->fl_start;
2537 deny->ld_length = ~(u64)0;
2538 if (fl->fl_end != ~(u64)0)
2539 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2540 deny->ld_type = NFS4_READ_LT;
2541 if (fl->fl_type != F_RDLCK)
2542 deny->ld_type = NFS4_WRITE_LT;
2543}
2544
1da177e4
LT		 2545static struct nfs4_stateowner *
2546find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2547 struct xdr_netobj *owner)
2548{
2549 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2550 struct nfs4_stateowner *op;
2551
2552 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2553 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2554 return op;
2555 }
2556 return NULL;
2557}
2558
2559/*
2560 * Alloc a lock owner structure.
2561 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2562 * occured.
2563 *
2564 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2565 */
2566
2567static struct nfs4_stateowner *
2568alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2569 struct nfs4_stateowner *sop;
2570 struct nfs4_replay *rp;
2571 unsigned int idhashval;
2572
2573 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2574 return NULL;
2575 idhashval = lockownerid_hashval(current_ownerid);
2576 INIT_LIST_HEAD(&sop->so_idhash);
2577 INIT_LIST_HEAD(&sop->so_strhash);
2578 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2579 INIT_LIST_HEAD(&sop->so_stateids);
2580 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2581 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2582 sop->so_time = 0;
2583 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2584 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2585 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2586 sop->so_is_open_owner = 0;
2587 sop->so_id = current_ownerid++;
2588 sop->so_client = clp;
b59e3c0e
NB		 2589 /* It is the openowner seqid that will be incremented in encode in the
2590 * case of new lockowners; so increment the lock seqid manually: */
2591 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2592 sop->so_confirmed = 1;
2593 rp = &sop->so_replay;
de1ae286 2594 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2595 rp->rp_buflen = 0;
2596 rp->rp_buf = rp->rp_ibuf;
2597 return sop;
2598}
2599
fd39ca9a 2600static struct nfs4_stateid *
1da177e4
LT		 2601alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2602{
2603 struct nfs4_stateid *stp;
2604 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2605
5ac049ac
N		 2606 stp = nfs4_alloc_stateid();
2607 if (stp == NULL)
1da177e4
LT		 2608 goto out;
2609 INIT_LIST_HEAD(&stp->st_hash);
2610 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2611 INIT_LIST_HEAD(&stp->st_perstateowner);
2612 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2613 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2614 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2615 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2616 stp->st_stateowner = sop;
13cd2184 2617 get_nfs4_file(fp);
1da177e4
LT		 2618 stp->st_file = fp;
2619 stp->st_stateid.si_boot = boot_time;
2620 stp->st_stateid.si_stateownerid = sop->so_id;
2621 stp->st_stateid.si_fileid = fp->fi_id;
2622 stp->st_stateid.si_generation = 0;
2623 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2624 stp->st_access_bmap = open_stp->st_access_bmap;
2625 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2626 stp->st_openstp = open_stp;
1da177e4
LT		 2627
2628out:
2629 return stp;
2630}
2631
fd39ca9a 2632static int
1da177e4
LT		 2633check_lock_length(u64 offset, u64 length)
2634{
2635 return ((length == 0) || ((length != ~(u64)0) &&
2636 LOFF_OVERFLOW(offset, length)));
2637}
2638
2639/*
2640 * LOCK operation
2641 */
b37ad28b 2642__be32
ca364317 2643nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2644 struct nfsd4_lock *lock)
1da177e4 2645{
3e9e3dbe 2646 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2647 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2648 struct nfs4_stateid *lock_stp;
2649 struct file *filp;
2650 struct file_lock file_lock;
8dc7c311 2651 struct file_lock conflock;
b37ad28b 2652 __be32 status = 0;
1da177e4 2653 unsigned int strhashval;
150b3934 2654 unsigned int cmd;
b8dd7b9a 2655 int err;
1da177e4
LT		 2656
2657 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2658 (long long) lock->lk_offset,
2659 (long long) lock->lk_length);
2660
1da177e4
LT		 2661 if (check_lock_length(lock->lk_offset, lock->lk_length))
2662 return nfserr_inval;
2663
ca364317
BF		 2664 if ((status = fh_verify(rqstp, &cstate->current_fh,
2665 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2666 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2667 return status;
2668 }
2669
1da177e4
LT		 2670 nfs4_lock_state();
2671
2672 if (lock->lk_is_new) {
893f8770
N		 2673 /*
2674 * Client indicates that this is a new lockowner.
2675 * Use open owner and open stateid to create lock owner and
2676 * lock stateid.
2677 */
1da177e4
LT		 2678 struct nfs4_stateid *open_stp = NULL;
2679 struct nfs4_file *fp;
2680
2681 status = nfserr_stale_clientid;
849823c5 2682 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2683 goto out;
1da177e4 2684
1da177e4 2685 /* validate and update open stateid and open seqid */
ca364317 2686 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2687 lock->lk_new_open_seqid,
2688 &lock->lk_new_open_stateid,
2689 CHECK_FH | OPEN_STATE,
3a65588a 2690 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2691 lock);
37515177 2692 if (status)
1da177e4 2693 goto out;
3a65588a 2694 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2695 /* create lockowner and lock stateid */
2696 fp = open_stp->st_file;
2697 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2698 open_sop->so_client->cl_clientid.cl_id,
2699 &lock->v.new.owner);
3e9e3dbe
N		 2700 /* XXX: Do we need to check for duplicate stateowners on
2701 * the same file, or should they just be allowed (and
2702 * create new stateids)? */
1da177e4 2703 status = nfserr_resource;
b59e3c0e
NB		 2704 lock_sop = alloc_init_lock_stateowner(strhashval,
2705 open_sop->so_client, open_stp, lock);
2706 if (lock_sop == NULL)
1da177e4 2707 goto out;
b59e3c0e 2708 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2709 if (lock_stp == NULL)
1da177e4 2710 goto out;
1da177e4
LT		 2711 } else {
2712 /* lock (lock owner + lock stateid) already exists */
ca364317 2713 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2714 lock->lk_old_lock_seqid,
2715 &lock->lk_old_lock_stateid,
2716 CHECK_FH | LOCK_STATE,
3a65588a 2717 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2718 if (status)
2719 goto out;
3a65588a 2720 lock_sop = lock->lk_replay_owner;
1da177e4 2721 }
3a65588a 2722 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2723 filp = lock_stp->st_vfs_file;
2724
0dd395dc
N		 2725 status = nfserr_grace;
2726 if (nfs4_in_grace() && !lock->lk_reclaim)
2727 goto out;
2728 status = nfserr_no_grace;
2729 if (!nfs4_in_grace() && lock->lk_reclaim)
2730 goto out;
2731
1da177e4
LT		 2732 locks_init_lock(&file_lock);
2733 switch (lock->lk_type) {
2734 case NFS4_READ_LT:
2735 case NFS4_READW_LT:
2736 file_lock.fl_type = F_RDLCK;
150b3934 2737 cmd = F_SETLK;
1da177e4
LT		 2738 break;
2739 case NFS4_WRITE_LT:
2740 case NFS4_WRITEW_LT:
2741 file_lock.fl_type = F_WRLCK;
150b3934 2742 cmd = F_SETLK;
1da177e4
LT		 2743 break;
2744 default:
2745 status = nfserr_inval;
2746 goto out;
2747 }
b59e3c0e 2748 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2749 file_lock.fl_pid = current->tgid;
2750 file_lock.fl_file = filp;
2751 file_lock.fl_flags = FL_POSIX;
d5b9026a 2752 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2753
2754 file_lock.fl_start = lock->lk_offset;
2755 if ((lock->lk_length == ~(u64)0) ||
2756 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2757 file_lock.fl_end = ~(u64)0;
2758 else
2759 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2760 nfs4_transform_lock_offset(&file_lock);
2761
2762 /*
2763 * Try to lock the file in the VFS.
2764 * Note: locks.c uses the BKL to protect the inode's lock list.
2765 */
2766
eb76b3fd
AA		 2767 /* XXX?: Just to divert the locks_release_private at the start of
2768 * locks_copy_lock: */
150b3934 2769 locks_init_lock(&conflock);
fd85b817 2770 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2771 switch (-err) {
1da177e4
LT		 2772 case 0: /* success! */
2773 update_stateid(&lock_stp->st_stateid);
2774 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2775 sizeof(stateid_t));
b8dd7b9a 2776 status = 0;
eb76b3fd
AA		 2777 break;
2778 case (EAGAIN): /* conflock holds conflicting lock */
2779 status = nfserr_denied;
2780 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2781 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2782 break;
1da177e4
LT		 2783 case (EDEADLK):
2784 status = nfserr_deadlock;
eb76b3fd 2785 break;
1da177e4 2786 default:
fd85b817 2787 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2788 status = nfserr_resource;
2789 break;
1da177e4 2790 }
1da177e4 2791out:
8a280510
BF		 2792 if (status && lock->lk_is_new && lock_sop)
2793 release_stateowner(lock_sop);
3a65588a
BF		 2794 if (lock->lk_replay_owner) {
2795 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2796 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2797 }
1da177e4
LT		 2798 nfs4_unlock_state();
2799 return status;
2800}
2801
2802/*
2803 * LOCKT operation
2804 */
b37ad28b 2805__be32
ca364317
BF		 2806nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2807 struct nfsd4_lockt *lockt)
1da177e4
LT		 2808{
2809 struct inode *inode;
2810 struct file file;
2811 struct file_lock file_lock;
fd85b817 2812 int error;
b37ad28b 2813 __be32 status;
1da177e4
LT		 2814
2815 if (nfs4_in_grace())
2816 return nfserr_grace;
2817
2818 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2819 return nfserr_inval;
2820
2821 lockt->lt_stateowner = NULL;
2822 nfs4_lock_state();
2823
2824 status = nfserr_stale_clientid;
849823c5 2825 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2826 goto out;
1da177e4 2827
ca364317 2828 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2829 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2830 if (status == nfserr_symlink)
2831 status = nfserr_inval;
2832 goto out;
2833 }
2834
ca364317 2835 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2836 locks_init_lock(&file_lock);
2837 switch (lockt->lt_type) {
2838 case NFS4_READ_LT:
2839 case NFS4_READW_LT:
2840 file_lock.fl_type = F_RDLCK;
2841 break;
2842 case NFS4_WRITE_LT:
2843 case NFS4_WRITEW_LT:
2844 file_lock.fl_type = F_WRLCK;
2845 break;
2846 default:
2fdada03 2847 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2848 status = nfserr_inval;
2849 goto out;
2850 }
2851
2852 lockt->lt_stateowner = find_lockstateowner_str(inode,
2853 &lockt->lt_clientid, &lockt->lt_owner);
2854 if (lockt->lt_stateowner)
2855 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2856 file_lock.fl_pid = current->tgid;
2857 file_lock.fl_flags = FL_POSIX;
d5b9026a 2858 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2859
2860 file_lock.fl_start = lockt->lt_offset;
2861 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2862 file_lock.fl_end = ~(u64)0;
2863 else
2864 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2865
2866 nfs4_transform_lock_offset(&file_lock);
2867
fd85b817 2868 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2869 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2870 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2871 * only the dentry:inode set.
2872 */
2873 memset(&file, 0, sizeof (struct file));
ca364317 2874 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2875
2876 status = nfs_ok;
fd85b817
ME		 2877 error = vfs_test_lock(&file, &file_lock);
2878 if (error) {
2879 status = nfserrno(error);
2880 goto out;
2881 }
9d6a8c5c 2882 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2883 status = nfserr_denied;
9d6a8c5c 2884 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2885 }
2886out:
2887 nfs4_unlock_state();
2888 return status;
2889}
2890
b37ad28b 2891__be32
ca364317 2892nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2893 struct nfsd4_locku *locku)
1da177e4
LT		 2894{
2895 struct nfs4_stateid *stp;
2896 struct file *filp = NULL;
2897 struct file_lock file_lock;
b37ad28b 2898 __be32 status;
b8dd7b9a 2899 int err;
1da177e4
LT		 2900
2901 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2902 (long long) locku->lu_offset,
2903 (long long) locku->lu_length);
2904
2905 if (check_lock_length(locku->lu_offset, locku->lu_length))
2906 return nfserr_inval;
2907
2908 nfs4_lock_state();
2909
ca364317 2910 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2911 locku->lu_seqid,
2912 &locku->lu_stateid,
2913 CHECK_FH | LOCK_STATE,
2914 &locku->lu_stateowner, &stp, NULL)))
2915 goto out;
2916
2917 filp = stp->st_vfs_file;
2918 BUG_ON(!filp);
2919 locks_init_lock(&file_lock);
2920 file_lock.fl_type = F_UNLCK;
2921 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2922 file_lock.fl_pid = current->tgid;
2923 file_lock.fl_file = filp;
2924 file_lock.fl_flags = FL_POSIX;
d5b9026a 2925 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2926 file_lock.fl_start = locku->lu_offset;
2927
2928 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2929 file_lock.fl_end = ~(u64)0;
2930 else
2931 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2932 nfs4_transform_lock_offset(&file_lock);
2933
2934 /*
2935 * Try to unlock the file in the VFS.
2936 */
fd85b817 2937 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2938 if (err) {
fd85b817 2939 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2940 goto out_nfserr;
2941 }
2942 /*
2943 * OK, unlock succeeded; the only thing left to do is update the stateid.
2944 */
2945 update_stateid(&stp->st_stateid);
2946 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2947
2948out:
f2327d9a 2949 if (locku->lu_stateowner) {
1da177e4 2950 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2951 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2952 }
1da177e4
LT		 2953 nfs4_unlock_state();
2954 return status;
2955
2956out_nfserr:
b8dd7b9a 2957 status = nfserrno(err);
1da177e4
LT		 2958 goto out;
2959}
2960
2961/*
2962 * returns
2963 * 1: locks held by lockowner
2964 * 0: no locks held by lockowner
2965 */
2966static int
2967check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2968{
2969 struct file_lock **flpp;
7eaa36e2 2970 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2971 int status = 0;
2972
2973 lock_kernel();
2974 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2975 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2976 status = 1;
2977 goto out;
796dadfd 2978 }
1da177e4
LT		 2979 }
2980out:
2981 unlock_kernel();
2982 return status;
2983}
2984
b37ad28b 2985__be32
b591480b
BF		 2986nfsd4_release_lockowner(struct svc_rqst *rqstp,
2987 struct nfsd4_compound_state *cstate,
2988 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2989{
2990 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2991 struct nfs4_stateowner *sop;
2992 struct nfs4_stateid *stp;
1da177e4 2993 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2994 struct list_head matches;
2995 int i;
b37ad28b 2996 __be32 status;
1da177e4
LT		 2997
2998 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2999 clid->cl_boot, clid->cl_id);
3000
3001 /* XXX check for lease expiration */
3002
3003 status = nfserr_stale_clientid;
849823c5 3004 if (STALE_CLIENTID(clid))
1da177e4 3005 return status;
1da177e4
LT		 3006
3007 nfs4_lock_state();
3008
3e9e3dbe
N		 3009 status = nfserr_locks_held;
3010 /* XXX: we're doing a linear search through all the lockowners.
3011 * Yipes! For now we'll just hope clients aren't really using
3012 * release_lockowner much, but eventually we have to fix these
3013 * data structures. */
3014 INIT_LIST_HEAD(&matches);
3015 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3016 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3017 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3018 continue;
3019 list_for_each_entry(stp, &sop->so_stateids,
3020 st_perstateowner) {
3021 if (check_for_locks(stp->st_vfs_file, sop))
3022 goto out;
3023 /* Note: so_perclient unused for lockowners,
3024 * so it's OK to fool with here. */
3025 list_add(&sop->so_perclient, &matches);
3026 }
1da177e4 3027 }
3e9e3dbe
N		 3028 }
3029 /* Clients probably won't expect us to return with some (but not all)
3030 * of the lockowner state released; so don't release any until all
3031 * have been checked. */
3032 status = nfs_ok;
0fa822e4
N		 3033 while (!list_empty(&matches)) {
3034 sop = list_entry(matches.next, struct nfs4_stateowner,
3035 so_perclient);
3036 /* unhash_stateowner deletes so_perclient only
3037 * for openowners. */
3038 list_del(&sop->so_perclient);
3e9e3dbe 3039 release_stateowner(sop);
1da177e4
LT		 3040 }
3041out:
3042 nfs4_unlock_state();
3043 return status;
3044}
3045
3046static inline struct nfs4_client_reclaim *
a55370a3 3047alloc_reclaim(void)
1da177e4 3048{
a55370a3 3049 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3050}
3051
c7b9a459
N		 3052int
3053nfs4_has_reclaimed_state(const char *name)
3054{
3055 unsigned int strhashval = clientstr_hashval(name);
3056 struct nfs4_client *clp;
3057
3058 clp = find_confirmed_client_by_str(name, strhashval);
3059 return clp ? 1 : 0;
3060}
3061
1da177e4
LT		 3062/*
3063 * failure => all reset bets are off, nfserr_no_grace...
3064 */
190e4fbf
N		 3065int
3066nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3067{
3068 unsigned int strhashval;
3069 struct nfs4_client_reclaim *crp = NULL;
3070
a55370a3
N		 3071 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3072 crp = alloc_reclaim();
1da177e4
LT		 3073 if (!crp)
3074 return 0;
a55370a3 3075 strhashval = clientstr_hashval(name);
1da177e4
LT		 3076 INIT_LIST_HEAD(&crp->cr_strhash);
3077 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3078 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3079 reclaim_str_hashtbl_size++;
3080 return 1;
3081}
3082
3083static void
3084nfs4_release_reclaim(void)
3085{
3086 struct nfs4_client_reclaim *crp = NULL;
3087 int i;
3088
1da177e4
LT		 3089 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3090 while (!list_empty(&reclaim_str_hashtbl[i])) {
3091 crp = list_entry(reclaim_str_hashtbl[i].next,
3092 struct nfs4_client_reclaim, cr_strhash);
3093 list_del(&crp->cr_strhash);
1da177e4
LT		 3094 kfree(crp);
3095 reclaim_str_hashtbl_size--;
3096 }
3097 }
3098 BUG_ON(reclaim_str_hashtbl_size);
3099}
3100
3101/*
3102 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3103static struct nfs4_client_reclaim *
1da177e4
LT		 3104nfs4_find_reclaim_client(clientid_t *clid)
3105{
3106 unsigned int strhashval;
3107 struct nfs4_client *clp;
3108 struct nfs4_client_reclaim *crp = NULL;
3109
3110
3111 /* find clientid in conf_id_hashtbl */
3112 clp = find_confirmed_client(clid);
3113 if (clp == NULL)
3114 return NULL;
3115
a55370a3
N		 3116 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3117 clp->cl_name.len, clp->cl_name.data,
3118 clp->cl_recdir);
1da177e4
LT		 3119
3120 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3121 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3122 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3123 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3124 return crp;
3125 }
3126 }
3127 return NULL;
3128}
3129
3130/*
3131* Called from OPEN. Look for clientid in reclaim list.
3132*/
b37ad28b 3133__be32
1da177e4
LT		 3134nfs4_check_open_reclaim(clientid_t *clid)
3135{
dfc83565 3136 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3137}
3138
ac4d8ff2 3139/* initialization to perform at module load time: */
1da177e4 3140
e8ff2a84 3141int
ac4d8ff2 3142nfs4_state_init(void)
1da177e4 3143{
e8ff2a84 3144 int i, status;
1da177e4 3145
e8ff2a84
BF		 3146 status = nfsd4_init_slabs();
3147 if (status)
3148 return status;
1da177e4
LT		 3149 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3150 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3151 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3152 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3153 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3154 }
3155 for (i = 0; i < FILE_HASH_SIZE; i++) {
3156 INIT_LIST_HEAD(&file_hashtbl[i]);
3157 }
3158 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3159 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3160 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3161 }
3162 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3163 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3164 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3165 }
3166 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3167 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3168 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3169 }
1da177e4 3170 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3171 INIT_LIST_HEAD(&close_lru);
3172 INIT_LIST_HEAD(&client_lru);
3173 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3174 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3175 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3176 reclaim_str_hashtbl_size = 0;
e8ff2a84 3177 return 0;
ac4d8ff2
N		 3178}
3179
190e4fbf
N		 3180static void
3181nfsd4_load_reboot_recovery_data(void)
3182{
3183 int status;
3184
0964a3d3
N		 3185 nfs4_lock_state();
3186 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3187 status = nfsd4_recdir_load();
0964a3d3 3188 nfs4_unlock_state();
190e4fbf
N		 3189 if (status)
3190 printk("NFSD: Failure reading reboot recovery data\n");
3191}
3192
9a8db97e
ME		 3193unsigned long
3194get_nfs4_grace_period(void)
3195{
3196 return max(user_lease_time, lease_time) * HZ;
3197}
3198
c2f1a551
MS		 3199/*
3200 * Since the lifetime of a delegation isn't limited to that of an open, a
3201 * client may quite reasonably hang on to a delegation as long as it has
3202 * the inode cached. This becomes an obvious problem the first time a
3203 * client's inode cache approaches the size of the server's total memory.
3204 *
3205 * For now we avoid this problem by imposing a hard limit on the number
3206 * of delegations, which varies according to the server's memory size.
3207 */
3208static void
3209set_max_delegations(void)
3210{
3211 /*
3212 * Allow at most 4 delegations per megabyte of RAM. Quick
3213 * estimates suggest that in the worst case (where every delegation
3214 * is for a different inode), a delegation could take about 1.5K,
3215 * giving a worst case usage of about 6% of memory.
3216 */
3217 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3218}
3219
ac4d8ff2
N		 3220/* initialization to perform when the nfsd service is started: */
3221
3222static void
3223__nfs4_state_start(void)
3224{
9a8db97e 3225 unsigned long grace_time;
ac4d8ff2 3226
1da177e4 3227 boot_time = get_seconds();
9a8db97e 3228 grace_time = get_nfs_grace_period();
d99a05ad 3229 lease_time = user_lease_time;
a76b4319 3230 in_grace = 1;
9a8db97e
ME		 3231 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3232 grace_time/HZ);
58da282b 3233 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3234 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3235 set_max_delegations();
1da177e4
LT		 3236}
3237
e8ff2a84 3238void
76a3550e 3239nfs4_state_start(void)
1da177e4 3240{
1da177e4 3241 if (nfs4_init)
e8ff2a84 3242 return;
190e4fbf 3243 nfsd4_load_reboot_recovery_data();
76a3550e 3244 __nfs4_state_start();
1da177e4 3245 nfs4_init = 1;
e8ff2a84 3246 return;
1da177e4
LT		 3247}
3248
3249int
3250nfs4_in_grace(void)
3251{
a76b4319 3252 return in_grace;
1da177e4
LT		 3253}
3254
3255time_t
3256nfs4_lease_time(void)
3257{
3258 return lease_time;
3259}
3260
3261static void
3262__nfs4_state_shutdown(void)
3263{
3264 int i;
3265 struct nfs4_client *clp = NULL;
3266 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3267 struct list_head *pos, *next, reaplist;
3268
1da177e4
LT		 3269 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3270 while (!list_empty(&conf_id_hashtbl[i])) {
3271 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3272 expire_client(clp);
3273 }
3274 while (!list_empty(&unconf_str_hashtbl[i])) {
3275 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3276 expire_client(clp);
3277 }
3278 }
3279 INIT_LIST_HEAD(&reaplist);
3280 spin_lock(&recall_lock);
3281 list_for_each_safe(pos, next, &del_recall_lru) {
3282 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3283 list_move(&dp->dl_recall_lru, &reaplist);
3284 }
3285 spin_unlock(&recall_lock);
3286 list_for_each_safe(pos, next, &reaplist) {
3287 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3288 list_del_init(&dp->dl_recall_lru);
3289 unhash_delegation(dp);
3290 }
3291
190e4fbf 3292 nfsd4_shutdown_recdir();
1da177e4 3293 nfs4_init = 0;
1da177e4
LT		 3294}
3295
3296void
3297nfs4_state_shutdown(void)
3298{
5e8d5c29
N		 3299 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3300 destroy_workqueue(laundry_wq);
1da177e4
LT		 3301 nfs4_lock_state();
3302 nfs4_release_reclaim();
3303 __nfs4_state_shutdown();
1da177e4
LT		 3304 nfs4_unlock_state();
3305}
3306
0964a3d3
N		 3307static void
3308nfs4_set_recdir(char *recdir)
3309{
3310 nfs4_lock_state();
3311 strcpy(user_recovery_dirname, recdir);
3312 nfs4_unlock_state();
3313}
3314
3315/*
3316 * Change the NFSv4 recovery directory to recdir.
3317 */
3318int
3319nfs4_reset_recoverydir(char *recdir)
3320{
3321 int status;
3322 struct nameidata nd;
3323
3324 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3325 if (status)
3326 return status;
3327 status = -ENOTDIR;
3328 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3329 nfs4_set_recdir(recdir);
3330 status = 0;
3331 }
3332 path_release(&nd);
3333 return status;
3334}
3335
1da177e4
LT		 3336/*
3337 * Called when leasetime is changed.
3338 *
d99a05ad
N		 3339 * The only way the protocol gives us to handle on-the-fly lease changes is to
3340 * simulate a reboot. Instead of doing that, we just wait till the next time
3341 * we start to register any changes in lease time. If the administrator
3342 * really wants to change the lease time *now*, they can go ahead and bring
3343 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3344 */
3345void
3346nfs4_reset_lease(time_t leasetime)
3347{
d99a05ad
N		 3348 lock_kernel();
3349 user_lease_time = leasetime;
3350 unlock_kernel();
1da177e4 3351}
Linux 6.x block layer and io_uring tree(s)