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