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nfsd4: miscellaneous nfs4state.c style fixes
[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_ownerid = 1;
65static u32 current_fileid = 1;
66static u32 current_delegid = 1;
67static u32 nfs4_init;
fd39ca9a
N		 68static stateid_t zerostateid; /* bits all 0 */
69static stateid_t onestateid; /* bits all 1 */
70
71#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
72#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 73
1da177e4 74/* forward declarations */
fd39ca9a 75static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 76static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
77static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 80
81/* Locking:
82 *
353ab6e9 83 * client_mutex:
1da177e4
LT		 84 * protects clientid_hashtbl[], clientstr_hashtbl[],
85 * unconfstr_hashtbl[], uncofid_hashtbl[].
86 */
353ab6e9 87static DEFINE_MUTEX(client_mutex);
1da177e4 88
e18b890b
CL		 89static struct kmem_cache *stateowner_slab = NULL;
90static struct kmem_cache *file_slab = NULL;
91static struct kmem_cache *stateid_slab = NULL;
92static struct kmem_cache *deleg_slab = NULL;
e60d4398 93
1da177e4
LT		 94void
95nfs4_lock_state(void)
96{
353ab6e9 97 mutex_lock(&client_mutex);
1da177e4
LT		 98}
99
100void
101nfs4_unlock_state(void)
102{
353ab6e9 103 mutex_unlock(&client_mutex);
1da177e4
LT		 104}
105
106static inline u32
107opaque_hashval(const void *ptr, int nbytes)
108{
109 unsigned char *cptr = (unsigned char *) ptr;
110
111 u32 x = 0;
112 while (nbytes--) {
113 x *= 37;
114 x += *cptr++;
115 }
116 return x;
117}
118
119/* forward declarations */
120static void release_stateowner(struct nfs4_stateowner *sop);
121static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 122
123/*
124 * Delegation state
125 */
126
127/* recall_lock protects the del_recall_lru */
34af946a 128static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 129static struct list_head del_recall_lru;
130
13cd2184
N		 131static void
132free_nfs4_file(struct kref *kref)
133{
134 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
135 list_del(&fp->fi_hash);
136 iput(fp->fi_inode);
137 kmem_cache_free(file_slab, fp);
138}
139
140static inline void
141put_nfs4_file(struct nfs4_file *fi)
142{
143 kref_put(&fi->fi_ref, free_nfs4_file);
144}
145
146static inline void
147get_nfs4_file(struct nfs4_file *fi)
148{
149 kref_get(&fi->fi_ref);
150}
151
ef0f3390 152static int num_delegations;
c2f1a551 153unsigned int max_delegations;
ef0f3390
N		 154
155/*
156 * Open owner state (share locks)
157 */
158
159/* hash tables for nfs4_stateowner */
160#define OWNER_HASH_BITS 8
161#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
162#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
163
164#define ownerid_hashval(id) \
165 ((id) & OWNER_HASH_MASK)
166#define ownerstr_hashval(clientid, ownername) \
167 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
168
169static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
170static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
171
172/* hash table for nfs4_file */
173#define FILE_HASH_BITS 8
174#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
175#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
176/* hash table for (open)nfs4_stateid */
177#define STATEID_HASH_BITS 10
178#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
179#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
180
181#define file_hashval(x) \
182 hash_ptr(x, FILE_HASH_BITS)
183#define stateid_hashval(owner_id, file_id) \
184 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
185
186static struct list_head file_hashtbl[FILE_HASH_SIZE];
187static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
188
1da177e4
LT		 189static struct nfs4_delegation *
190alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
191{
192 struct nfs4_delegation *dp;
193 struct nfs4_file *fp = stp->st_file;
194 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
195
196 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 197 if (fp->fi_had_conflict)
198 return NULL;
c2f1a551 199 if (num_delegations > max_delegations)
ef0f3390 200 return NULL;
5b2d21c1
N		 201 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
202 if (dp == NULL)
1da177e4 203 return dp;
ef0f3390 204 num_delegations++;
ea1da636
N		 205 INIT_LIST_HEAD(&dp->dl_perfile);
206 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 207 INIT_LIST_HEAD(&dp->dl_recall_lru);
208 dp->dl_client = clp;
13cd2184 209 get_nfs4_file(fp);
1da177e4
LT		 210 dp->dl_file = fp;
211 dp->dl_flock = NULL;
212 get_file(stp->st_vfs_file);
213 dp->dl_vfs_file = stp->st_vfs_file;
214 dp->dl_type = type;
215 dp->dl_recall.cbr_dp = NULL;
216 dp->dl_recall.cbr_ident = cb->cb_ident;
217 dp->dl_recall.cbr_trunc = 0;
218 dp->dl_stateid.si_boot = boot_time;
219 dp->dl_stateid.si_stateownerid = current_delegid++;
220 dp->dl_stateid.si_fileid = 0;
221 dp->dl_stateid.si_generation = 0;
222 dp->dl_fhlen = current_fh->fh_handle.fh_size;
223 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
224 current_fh->fh_handle.fh_size);
225 dp->dl_time = 0;
226 atomic_set(&dp->dl_count, 1);
ea1da636
N		 227 list_add(&dp->dl_perfile, &fp->fi_delegations);
228 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 229 return dp;
230}
231
232void
233nfs4_put_delegation(struct nfs4_delegation *dp)
234{
235 if (atomic_dec_and_test(&dp->dl_count)) {
236 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 237 put_nfs4_file(dp->dl_file);
5b2d21c1 238 kmem_cache_free(deleg_slab, dp);
ef0f3390 239 num_delegations--;
1da177e4
LT		 240 }
241}
242
243/* Remove the associated file_lock first, then remove the delegation.
244 * lease_modify() is called to remove the FS_LEASE file_lock from
245 * the i_flock list, eventually calling nfsd's lock_manager
246 * fl_release_callback.
247 */
248static void
249nfs4_close_delegation(struct nfs4_delegation *dp)
250{
251 struct file *filp = dp->dl_vfs_file;
252
253 dprintk("NFSD: close_delegation dp %p\n",dp);
254 dp->dl_vfs_file = NULL;
255 /* The following nfsd_close may not actually close the file,
256 * but we want to remove the lease in any case. */
c907132d 257 if (dp->dl_flock)
a9933cea 258 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 259 nfsd_close(filp);
1da177e4
LT		 260}
261
262/* Called under the state lock. */
263static void
264unhash_delegation(struct nfs4_delegation *dp)
265{
ea1da636
N		 266 list_del_init(&dp->dl_perfile);
267 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 268 spin_lock(&recall_lock);
269 list_del_init(&dp->dl_recall_lru);
270 spin_unlock(&recall_lock);
271 nfs4_close_delegation(dp);
272 nfs4_put_delegation(dp);
273}
274
275/*
276 * SETCLIENTID state
277 */
278
279/* Hash tables for nfs4_clientid state */
280#define CLIENT_HASH_BITS 4
281#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
282#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
283
284#define clientid_hashval(id) \
285 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 286#define clientstr_hashval(name) \
287 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 288/*
289 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
290 * used in reboot/reset lease grace period processing
291 *
292 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
293 * setclientid_confirmed info.
294 *
295 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
296 * setclientid info.
297 *
298 * client_lru holds client queue ordered by nfs4_client.cl_time
299 * for lease renewal.
300 *
301 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
302 * for last close replay.
303 */
304static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
305static int reclaim_str_hashtbl_size = 0;
306static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
307static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head client_lru;
311static struct list_head close_lru;
312
313static inline void
314renew_client(struct nfs4_client *clp)
315{
316 /*
317 * Move client to the end to the LRU list.
318 */
319 dprintk("renewing client (clientid %08x/%08x)\n",
320 clp->cl_clientid.cl_boot,
321 clp->cl_clientid.cl_id);
322 list_move_tail(&clp->cl_lru, &client_lru);
323 clp->cl_time = get_seconds();
324}
325
326/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
327static int
328STALE_CLIENTID(clientid_t *clid)
329{
330 if (clid->cl_boot == boot_time)
331 return 0;
332 dprintk("NFSD stale clientid (%08x/%08x)\n",
333 clid->cl_boot, clid->cl_id);
334 return 1;
335}
336
337/*
338 * XXX Should we use a slab cache ?
339 * This type of memory management is somewhat inefficient, but we use it
340 * anyway since SETCLIENTID is not a common operation.
341 */
35bba9a3 342static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 343{
344 struct nfs4_client *clp;
345
35bba9a3
BF		 346 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
347 if (clp == NULL)
348 return NULL;
349 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
350 if (clp->cl_name.data == NULL) {
351 kfree(clp);
352 return NULL;
1da177e4 353 }
35bba9a3
BF		 354 memcpy(clp->cl_name.data, name.data, name.len);
355 clp->cl_name.len = name.len;
1da177e4
LT		 356 return clp;
357}
358
1b1a9b31
BF		 359static void
360shutdown_callback_client(struct nfs4_client *clp)
361{
362 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
363
364 /* shutdown rpc client, ending any outstanding recall rpcs */
365 if (clnt) {
366 clp->cl_callback.cb_client = NULL;
367 rpc_shutdown_client(clnt);
368 }
369}
370
1da177e4
LT		 371static inline void
372free_client(struct nfs4_client *clp)
373{
1b1a9b31 374 shutdown_callback_client(clp);
1da177e4
LT		 375 if (clp->cl_cred.cr_group_info)
376 put_group_info(clp->cl_cred.cr_group_info);
377 kfree(clp->cl_name.data);
378 kfree(clp);
379}
380
381void
382put_nfs4_client(struct nfs4_client *clp)
383{
384 if (atomic_dec_and_test(&clp->cl_count))
385 free_client(clp);
386}
387
388static void
389expire_client(struct nfs4_client *clp)
390{
391 struct nfs4_stateowner *sop;
392 struct nfs4_delegation *dp;
1da177e4
LT		 393 struct list_head reaplist;
394
395 dprintk("NFSD: expire_client cl_count %d\n",
396 atomic_read(&clp->cl_count));
397
1da177e4
LT		 398 INIT_LIST_HEAD(&reaplist);
399 spin_lock(&recall_lock);
ea1da636
N		 400 while (!list_empty(&clp->cl_delegations)) {
401 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 402 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
403 dp->dl_flock);
ea1da636 404 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 405 list_move(&dp->dl_recall_lru, &reaplist);
406 }
407 spin_unlock(&recall_lock);
408 while (!list_empty(&reaplist)) {
409 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
410 list_del_init(&dp->dl_recall_lru);
411 unhash_delegation(dp);
412 }
413 list_del(&clp->cl_idhash);
414 list_del(&clp->cl_strhash);
415 list_del(&clp->cl_lru);
ea1da636
N		 416 while (!list_empty(&clp->cl_openowners)) {
417 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 418 release_stateowner(sop);
419 }
420 put_nfs4_client(clp);
421}
422
35bba9a3
BF		 423static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
424{
1da177e4
LT		 425 struct nfs4_client *clp;
426
35bba9a3
BF		 427 clp = alloc_client(name);
428 if (clp == NULL)
429 return NULL;
a55370a3 430 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 431 atomic_set(&clp->cl_count, 1);
432 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 433 INIT_LIST_HEAD(&clp->cl_idhash);
434 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 435 INIT_LIST_HEAD(&clp->cl_openowners);
436 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 437 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 438 return clp;
439}
440
35bba9a3
BF		 441static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
442{
443 memcpy(target->cl_verifier.data, source->data,
444 sizeof(target->cl_verifier.data));
1da177e4
LT		 445}
446
35bba9a3
BF		 447static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
448{
1da177e4
LT		 449 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
450 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
451}
452
35bba9a3
BF		 453static void copy_cred(struct svc_cred *target, struct svc_cred *source)
454{
1da177e4
LT		 455 target->cr_uid = source->cr_uid;
456 target->cr_gid = source->cr_gid;
457 target->cr_group_info = source->cr_group_info;
458 get_group_info(target->cr_group_info);
459}
460
35bba9a3 461static int same_name(const char *n1, const char *n2)
599e0a22 462{
a55370a3 463 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 464}
465
466static int
599e0a22
BF		 467same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
468{
469 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 470}
471
472static int
599e0a22
BF		 473same_clid(clientid_t *cl1, clientid_t *cl2)
474{
475 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 476}
477
478/* XXX what about NGROUP */
479static int
599e0a22
BF		 480same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
481{
482 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 483}
484
5ec7b46c
BF		 485static void gen_clid(struct nfs4_client *clp)
486{
487 static u32 current_clientid = 1;
488
1da177e4
LT		 489 clp->cl_clientid.cl_boot = boot_time;
490 clp->cl_clientid.cl_id = current_clientid++;
491}
492
deda2faa
BF		 493static void gen_confirm(struct nfs4_client *clp)
494{
495 static u32 i;
496 u32 *p;
1da177e4 497
1da177e4 498 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 499 *p++ = get_seconds();
500 *p++ = i++;
1da177e4
LT		 501}
502
35bba9a3
BF		 503static int check_name(struct xdr_netobj name)
504{
1da177e4
LT		 505 if (name.len == 0)
506 return 0;
507 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 508 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 509 return 0;
510 }
511 return 1;
512}
513
fd39ca9a 514static void
1da177e4
LT		 515add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
516{
517 unsigned int idhashval;
518
519 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
520 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
521 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
522 list_add_tail(&clp->cl_lru, &client_lru);
523 clp->cl_time = get_seconds();
524}
525
fd39ca9a 526static void
1da177e4
LT		 527move_to_confirmed(struct nfs4_client *clp)
528{
529 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
530 unsigned int strhashval;
531
532 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
533 list_del_init(&clp->cl_strhash);
f116629d 534 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 535 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 536 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
537 renew_client(clp);
538}
539
540static struct nfs4_client *
541find_confirmed_client(clientid_t *clid)
542{
543 struct nfs4_client *clp;
544 unsigned int idhashval = clientid_hashval(clid->cl_id);
545
546 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 547 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 548 return clp;
549 }
550 return NULL;
551}
552
553static struct nfs4_client *
554find_unconfirmed_client(clientid_t *clid)
555{
556 struct nfs4_client *clp;
557 unsigned int idhashval = clientid_hashval(clid->cl_id);
558
559 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 560 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 561 return clp;
562 }
563 return NULL;
564}
565
28ce6054
N		 566static struct nfs4_client *
567find_confirmed_client_by_str(const char *dname, unsigned int hashval)
568{
569 struct nfs4_client *clp;
570
571 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
572 if (same_name(clp->cl_recdir, dname))
573 return clp;
574 }
575 return NULL;
576}
577
578static struct nfs4_client *
579find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
580{
581 struct nfs4_client *clp;
582
583 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
584 if (same_name(clp->cl_recdir, dname))
585 return clp;
586 }
587 return NULL;
588}
589
1da177e4
LT		 590/* a helper function for parse_callback */
591static int
592parse_octet(unsigned int *lenp, char **addrp)
593{
594 unsigned int len = *lenp;
595 char *p = *addrp;
596 int n = -1;
597 char c;
598
599 for (;;) {
600 if (!len)
601 break;
602 len--;
603 c = *p++;
604 if (c == '.')
605 break;
606 if ((c < '0') || (c > '9')) {
607 n = -1;
608 break;
609 }
610 if (n < 0)
611 n = 0;
612 n = (n * 10) + (c - '0');
613 if (n > 255) {
614 n = -1;
615 break;
616 }
617 }
618 *lenp = len;
619 *addrp = p;
620 return n;
621}
622
623/* parse and set the setclientid ipv4 callback address */
fd39ca9a 624static int
1da177e4
LT		 625parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
626{
627 int temp = 0;
628 u32 cbaddr = 0;
629 u16 cbport = 0;
630 u32 addrlen = addr_len;
631 char *addr = addr_val;
632 int i, shift;
633
634 /* ipaddress */
635 shift = 24;
636 for(i = 4; i > 0 ; i--) {
637 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
638 return 0;
639 }
640 cbaddr |= (temp << shift);
641 if (shift > 0)
642 shift -= 8;
643 }
644 *cbaddrp = cbaddr;
645
646 /* port */
647 shift = 8;
648 for(i = 2; i > 0 ; i--) {
649 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
650 return 0;
651 }
652 cbport |= (temp << shift);
653 if (shift > 0)
654 shift -= 8;
655 }
656 *cbportp = cbport;
657 return 1;
658}
659
fd39ca9a 660static void
1da177e4
LT		 661gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
662{
663 struct nfs4_callback *cb = &clp->cl_callback;
664
665 /* Currently, we only support tcp for the callback channel */
666 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
667 goto out_err;
668
669 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
670 &cb->cb_addr, &cb->cb_port)))
671 goto out_err;
672 cb->cb_prog = se->se_callback_prog;
673 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 674 return;
675out_err:
849823c5 676 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 677 "will not receive delegations\n",
678 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
679
1da177e4
LT		 680 return;
681}
682
b37ad28b 683__be32
b591480b
BF		 684nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
685 struct nfsd4_setclientid *setclid)
1da177e4 686{
27459f09 687 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 688 struct xdr_netobj clname = {
689 .len = setclid->se_namelen,
690 .data = setclid->se_name,
691 };
692 nfs4_verifier clverifier = setclid->se_verf;
693 unsigned int strhashval;
28ce6054 694 struct nfs4_client *conf, *unconf, *new;
b37ad28b 695 __be32 status;
a55370a3 696 char dname[HEXDIR_LEN];
1da177e4 697
1da177e4 698 if (!check_name(clname))
73aea4ec 699 return nfserr_inval;
1da177e4 700
a55370a3
N		 701 status = nfs4_make_rec_clidname(dname, &clname);
702 if (status)
73aea4ec 703 return status;
a55370a3 704
1da177e4
LT		 705 /*
706 * XXX The Duplicate Request Cache (DRC) has been checked (??)
707 * We get here on a DRC miss.
708 */
709
a55370a3 710 strhashval = clientstr_hashval(dname);
1da177e4 711
1da177e4 712 nfs4_lock_state();
28ce6054
N		 713 conf = find_confirmed_client_by_str(dname, strhashval);
714 if (conf) {
a186e767 715 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 716 status = nfserr_clid_inuse;
599e0a22 717 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 718 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 719 dprintk("NFSD: setclientid: string in use by client"
720 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 721 goto out;
722 }
1da177e4 723 }
a186e767
BF		 724 /*
725 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
726 * has a description of SETCLIENTID request processing consisting
727 * of 5 bullet points, labeled as CASE0 - CASE4 below.
728 */
28ce6054 729 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 730 status = nfserr_resource;
731 if (!conf) {
a186e767
BF		 732 /*
733 * RFC 3530 14.2.33 CASE 4:
734 * placed first, because it is the normal case
1da177e4
LT		 735 */
736 if (unconf)
737 expire_client(unconf);
a55370a3
N		 738 new = create_client(clname, dname);
739 if (new == NULL)
1da177e4 740 goto out;
1da177e4 741 gen_clid(new);
599e0a22 742 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 743 /*
a186e767
BF		 744 * RFC 3530 14.2.33 CASE 1:
745 * probable callback update
1da177e4 746 */
31f4a6c1
N		 747 if (unconf) {
748 /* Note this is removing unconfirmed {*x***},
749 * which is stronger than RFC recommended {vxc**}.
750 * This has the advantage that there is at most
751 * one {*x***} in either list at any time.
752 */
753 expire_client(unconf);
1da177e4 754 }
a55370a3
N		 755 new = create_client(clname, dname);
756 if (new == NULL)
1da177e4 757 goto out;
1da177e4 758 copy_clid(new, conf);
1da177e4
LT		 759 } else if (!unconf) {
760 /*
a186e767
BF		 761 * RFC 3530 14.2.33 CASE 2:
762 * probable client reboot; state will be removed if
763 * confirmed.
1da177e4 764 */
a55370a3
N		 765 new = create_client(clname, dname);
766 if (new == NULL)
1da177e4 767 goto out;
1da177e4 768 gen_clid(new);
49ba8781 769 } else {
a186e767
BF		 770 /*
771 * RFC 3530 14.2.33 CASE 3:
772 * probable client reboot; state will be removed if
773 * confirmed.
1da177e4
LT		 774 */
775 expire_client(unconf);
a55370a3
N		 776 new = create_client(clname, dname);
777 if (new == NULL)
1da177e4 778 goto out;
1da177e4 779 gen_clid(new);
1da177e4 780 }
c175b83c
BF		 781 copy_verf(new, &clverifier);
782 new->cl_addr = sin->sin_addr.s_addr;
783 copy_cred(&new->cl_cred, &rqstp->rq_cred);
784 gen_confirm(new);
785 gen_callback(new, setclid);
786 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 787 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
788 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
789 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
790 status = nfs_ok;
791out:
792 nfs4_unlock_state();
793 return status;
794}
795
796
797/*
a186e767
BF		 798 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
799 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
800 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 801 */
b37ad28b 802__be32
b591480b
BF		 803nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
804 struct nfsd4_compound_state *cstate,
805 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 806{
27459f09 807 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 808 struct nfs4_client *conf, *unconf;
1da177e4
LT		 809 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
810 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 811 __be32 status;
1da177e4
LT		 812
813 if (STALE_CLIENTID(clid))
814 return nfserr_stale_clientid;
815 /*
816 * XXX The Duplicate Request Cache (DRC) has been checked (??)
817 * We get here on a DRC miss.
818 */
819
820 nfs4_lock_state();
21ab45a4
N		 821
822 conf = find_confirmed_client(clid);
823 unconf = find_unconfirmed_client(clid);
824
825 status = nfserr_clid_inuse;
27459f09 826 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 827 goto out;
27459f09 828 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 829 goto out;
830
a186e767
BF		 831 /*
832 * section 14.2.34 of RFC 3530 has a description of
833 * SETCLIENTID_CONFIRM request processing consisting
834 * of 4 bullet points, labeled as CASE1 - CASE4 below.
835 */
366e0c1d 836 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 837 /*
838 * RFC 3530 14.2.34 CASE 1:
839 * callback update
840 */
599e0a22 841 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 842 status = nfserr_clid_inuse;
843 else {
1a69c179
N		 844 /* XXX: We just turn off callbacks until we can handle
845 * change request correctly. */
cb36d634 846 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 847 gen_confirm(conf);
46309029 848 nfsd4_remove_clid_dir(unconf);
1a69c179 849 expire_client(unconf);
1da177e4 850 status = nfs_ok;
1a69c179 851
1da177e4 852 }
f3aba4e5 853 } else if (conf && !unconf) {
a186e767
BF		 854 /*
855 * RFC 3530 14.2.34 CASE 2:
856 * probable retransmitted request; play it safe and
857 * do nothing.
7c79f737 858 */
599e0a22 859 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 860 status = nfserr_clid_inuse;
21ab45a4 861 else
1da177e4 862 status = nfs_ok;
7c79f737 863 } else if (!conf && unconf
599e0a22 864 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 865 /*
866 * RFC 3530 14.2.34 CASE 3:
867 * Normal case; new or rebooted client:
7c79f737 868 */
599e0a22 869 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 870 status = nfserr_clid_inuse;
871 } else {
1a69c179
N		 872 unsigned int hash =
873 clientstr_hashval(unconf->cl_recdir);
874 conf = find_confirmed_client_by_str(unconf->cl_recdir,
875 hash);
876 if (conf) {
c7b9a459 877 nfsd4_remove_clid_dir(conf);
1a69c179
N		 878 expire_client(conf);
879 }
1da177e4 880 move_to_confirmed(unconf);
21ab45a4 881 conf = unconf;
46f8a64b 882 nfsd4_probe_callback(conf);
1a69c179 883 status = nfs_ok;
1da177e4 884 }
599e0a22
BF		 885 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
886 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 887 &confirm)))) {
a186e767
BF		 888 /*
889 * RFC 3530 14.2.34 CASE 4:
890 * Client probably hasn't noticed that we rebooted yet.
7c79f737 891 */
1da177e4 892 status = nfserr_stale_clientid;
7c79f737 893 } else {
08e8987c
N		 894 /* check that we have hit one of the cases...*/
895 status = nfserr_clid_inuse;
896 }
1da177e4 897out:
1da177e4
LT		 898 nfs4_unlock_state();
899 return status;
900}
901
1da177e4
LT		 902/* OPEN Share state helper functions */
903static inline struct nfs4_file *
904alloc_init_file(struct inode *ino)
905{
906 struct nfs4_file *fp;
907 unsigned int hashval = file_hashval(ino);
908
e60d4398
N		 909 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
910 if (fp) {
13cd2184 911 kref_init(&fp->fi_ref);
1da177e4 912 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 913 INIT_LIST_HEAD(&fp->fi_stateids);
914 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 915 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
916 fp->fi_inode = igrab(ino);
917 fp->fi_id = current_fileid++;
47f9940c 918 fp->fi_had_conflict = false;
1da177e4
LT		 919 return fp;
920 }
921 return NULL;
922}
923
e60d4398 924static void
e18b890b 925nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 926{
e60d4398
N		 927 if (*slab == NULL)
928 return;
1a1d92c1 929 kmem_cache_destroy(*slab);
e60d4398 930 *slab = NULL;
1da177e4
LT		 931}
932
e8ff2a84 933void
1da177e4
LT		 934nfsd4_free_slabs(void)
935{
e60d4398
N		 936 nfsd4_free_slab(&stateowner_slab);
937 nfsd4_free_slab(&file_slab);
5ac049ac 938 nfsd4_free_slab(&stateid_slab);
5b2d21c1 939 nfsd4_free_slab(&deleg_slab);
e60d4398 940}
1da177e4 941
e60d4398
N		 942static int
943nfsd4_init_slabs(void)
944{
945 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 946 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 947 if (stateowner_slab == NULL)
948 goto out_nomem;
949 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 950 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 951 if (file_slab == NULL)
952 goto out_nomem;
5ac049ac 953 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 954 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 955 if (stateid_slab == NULL)
956 goto out_nomem;
5b2d21c1 957 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 958 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 959 if (deleg_slab == NULL)
960 goto out_nomem;
e60d4398
N		 961 return 0;
962out_nomem:
963 nfsd4_free_slabs();
964 dprintk("nfsd4: out of memory while initializing nfsv4\n");
965 return -ENOMEM;
1da177e4
LT		 966}
967
968void
969nfs4_free_stateowner(struct kref *kref)
970{
971 struct nfs4_stateowner *sop =
972 container_of(kref, struct nfs4_stateowner, so_ref);
973 kfree(sop->so_owner.data);
974 kmem_cache_free(stateowner_slab, sop);
975}
976
977static inline struct nfs4_stateowner *
978alloc_stateowner(struct xdr_netobj *owner)
979{
980 struct nfs4_stateowner *sop;
981
982 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
983 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
984 memcpy(sop->so_owner.data, owner->data, owner->len);
985 sop->so_owner.len = owner->len;
986 kref_init(&sop->so_ref);
987 return sop;
988 }
989 kmem_cache_free(stateowner_slab, sop);
990 }
991 return NULL;
992}
993
994static struct nfs4_stateowner *
995alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
996 struct nfs4_stateowner *sop;
997 struct nfs4_replay *rp;
998 unsigned int idhashval;
999
1000 if (!(sop = alloc_stateowner(&open->op_owner)))
1001 return NULL;
1002 idhashval = ownerid_hashval(current_ownerid);
1003 INIT_LIST_HEAD(&sop->so_idhash);
1004 INIT_LIST_HEAD(&sop->so_strhash);
1005 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1006 INIT_LIST_HEAD(&sop->so_stateids);
1007 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1008 INIT_LIST_HEAD(&sop->so_close_lru);
1009 sop->so_time = 0;
1010 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1011 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1012 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1013 sop->so_is_open_owner = 1;
1014 sop->so_id = current_ownerid++;
1015 sop->so_client = clp;
1016 sop->so_seqid = open->op_seqid;
1017 sop->so_confirmed = 0;
1018 rp = &sop->so_replay;
de1ae286 1019 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1020 rp->rp_buflen = 0;
1021 rp->rp_buf = rp->rp_ibuf;
1022 return sop;
1023}
1024
1025static void
1026release_stateid_lockowners(struct nfs4_stateid *open_stp)
1027{
1028 struct nfs4_stateowner *lock_sop;
1029
ea1da636
N		 1030 while (!list_empty(&open_stp->st_lockowners)) {
1031 lock_sop = list_entry(open_stp->st_lockowners.next,
1032 struct nfs4_stateowner, so_perstateid);
1033 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1034 BUG_ON(lock_sop->so_is_open_owner);
1035 release_stateowner(lock_sop);
1036 }
1037}
1038
1039static void
1040unhash_stateowner(struct nfs4_stateowner *sop)
1041{
1042 struct nfs4_stateid *stp;
1043
1044 list_del(&sop->so_idhash);
1045 list_del(&sop->so_strhash);
6fa305de 1046 if (sop->so_is_open_owner)
1da177e4 1047 list_del(&sop->so_perclient);
ea1da636
N		 1048 list_del(&sop->so_perstateid);
1049 while (!list_empty(&sop->so_stateids)) {
1050 stp = list_entry(sop->so_stateids.next,
1051 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1052 if (sop->so_is_open_owner)
1053 release_stateid(stp, OPEN_STATE);
1054 else
1055 release_stateid(stp, LOCK_STATE);
1056 }
1057}
1058
1059static void
1060release_stateowner(struct nfs4_stateowner *sop)
1061{
1062 unhash_stateowner(sop);
1063 list_del(&sop->so_close_lru);
1064 nfs4_put_stateowner(sop);
1065}
1066
1067static inline void
1068init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1069 struct nfs4_stateowner *sop = open->op_stateowner;
1070 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1071
1072 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1073 INIT_LIST_HEAD(&stp->st_perstateowner);
1074 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1075 INIT_LIST_HEAD(&stp->st_perfile);
1076 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1077 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1078 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1079 stp->st_stateowner = sop;
13cd2184 1080 get_nfs4_file(fp);
1da177e4
LT		 1081 stp->st_file = fp;
1082 stp->st_stateid.si_boot = boot_time;
1083 stp->st_stateid.si_stateownerid = sop->so_id;
1084 stp->st_stateid.si_fileid = fp->fi_id;
1085 stp->st_stateid.si_generation = 0;
1086 stp->st_access_bmap = 0;
1087 stp->st_deny_bmap = 0;
1088 __set_bit(open->op_share_access, &stp->st_access_bmap);
1089 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1090 stp->st_openstp = NULL;
1da177e4
LT		 1091}
1092
1093static void
1094release_stateid(struct nfs4_stateid *stp, int flags)
1095{
1096 struct file *filp = stp->st_vfs_file;
1097
1098 list_del(&stp->st_hash);
1da177e4 1099 list_del(&stp->st_perfile);
ea1da636 1100 list_del(&stp->st_perstateowner);
1da177e4
LT		 1101 if (flags & OPEN_STATE) {
1102 release_stateid_lockowners(stp);
1103 stp->st_vfs_file = NULL;
1104 nfsd_close(filp);
1da177e4
LT		 1105 } else if (flags & LOCK_STATE)
1106 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1107 put_nfs4_file(stp->st_file);
5ac049ac 1108 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1109}
1110
fd39ca9a 1111static void
1da177e4
LT		 1112move_to_close_lru(struct nfs4_stateowner *sop)
1113{
1114 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1115
358dd55a 1116 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1117 sop->so_time = get_seconds();
1118}
1119
1da177e4 1120static int
599e0a22
BF		 1121same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1122 clientid_t *clid)
1123{
1124 return (sop->so_owner.len == owner->len) &&
1125 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1126 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1127}
1128
1129static struct nfs4_stateowner *
1130find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1131{
1132 struct nfs4_stateowner *so = NULL;
1133
1134 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1135 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1136 return so;
1137 }
1138 return NULL;
1139}
1140
1141/* search file_hashtbl[] for file */
1142static struct nfs4_file *
1143find_file(struct inode *ino)
1144{
1145 unsigned int hashval = file_hashval(ino);
1146 struct nfs4_file *fp;
1147
1148 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1149 if (fp->fi_inode == ino) {
1150 get_nfs4_file(fp);
1da177e4 1151 return fp;
13cd2184 1152 }
1da177e4
LT		 1153 }
1154 return NULL;
1155}
1156
ba5a6a19
BF		 1157static int access_valid(u32 x)
1158{
1159 return (x > 0 && x < 4);
1160}
1161
1162static int deny_valid(u32 x)
1163{
1164 return (x >= 0 && x < 5);
1165}
1da177e4 1166
fd39ca9a 1167static void
1da177e4
LT		 1168set_access(unsigned int *access, unsigned long bmap) {
1169 int i;
1170
1171 *access = 0;
1172 for (i = 1; i < 4; i++) {
1173 if (test_bit(i, &bmap))
1174 *access |= i;
1175 }
1176}
1177
fd39ca9a 1178static void
1da177e4
LT		 1179set_deny(unsigned int *deny, unsigned long bmap) {
1180 int i;
1181
1182 *deny = 0;
1183 for (i = 0; i < 4; i++) {
1184 if (test_bit(i, &bmap))
1185 *deny |= i ;
1186 }
1187}
1188
1189static int
1190test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1191 unsigned int access, deny;
1192
1193 set_access(&access, stp->st_access_bmap);
1194 set_deny(&deny, stp->st_deny_bmap);
1195 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1196 return 0;
1197 return 1;
1198}
1199
1200/*
1201 * Called to check deny when READ with all zero stateid or
1202 * WRITE with all zero or all one stateid
1203 */
b37ad28b 1204static __be32
1da177e4
LT		 1205nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1206{
1207 struct inode *ino = current_fh->fh_dentry->d_inode;
1208 struct nfs4_file *fp;
1209 struct nfs4_stateid *stp;
b37ad28b 1210 __be32 ret;
1da177e4
LT		 1211
1212 dprintk("NFSD: nfs4_share_conflict\n");
1213
1214 fp = find_file(ino);
13cd2184
N		 1215 if (!fp)
1216 return nfs_ok;
b700949b 1217 ret = nfserr_locked;
1da177e4 1218 /* Search for conflicting share reservations */
13cd2184
N		 1219 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1220 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1221 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1222 goto out;
1da177e4 1223 }
13cd2184
N		 1224 ret = nfs_ok;
1225out:
1226 put_nfs4_file(fp);
1227 return ret;
1da177e4
LT		 1228}
1229
1230static inline void
1231nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1232{
1233 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1234 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1235 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1236 }
1237}
1238
1239/*
1240 * Recall a delegation
1241 */
1242static int
1243do_recall(void *__dp)
1244{
1245 struct nfs4_delegation *dp = __dp;
1246
47f9940c 1247 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1248 nfsd4_cb_recall(dp);
1249 return 0;
1250}
1251
1252/*
1253 * Spawn a thread to perform a recall on the delegation represented
1254 * by the lease (file_lock)
1255 *
1256 * Called from break_lease() with lock_kernel() held.
1257 * Note: we assume break_lease will only call this *once* for any given
1258 * lease.
1259 */
1260static
1261void nfsd_break_deleg_cb(struct file_lock *fl)
1262{
1263 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1264 struct task_struct *t;
1265
1266 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1267 if (!dp)
1268 return;
1269
1270 /* We're assuming the state code never drops its reference
1271 * without first removing the lease. Since we're in this lease
1272 * callback (and since the lease code is serialized by the kernel
1273 * lock) we know the server hasn't removed the lease yet, we know
1274 * it's safe to take a reference: */
1275 atomic_inc(&dp->dl_count);
cfdcad4d 1276 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1277
1278 spin_lock(&recall_lock);
1279 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1280 spin_unlock(&recall_lock);
1281
1282 /* only place dl_time is set. protected by lock_kernel*/
1283 dp->dl_time = get_seconds();
1284
0272e1fd
BF		 1285 /*
1286 * We don't want the locks code to timeout the lease for us;
1287 * we'll remove it ourself if the delegation isn't returned
1288 * in time.
1289 */
1290 fl->fl_break_time = 0;
1da177e4
LT		 1291
1292 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1293 if (IS_ERR(t)) {
1294 struct nfs4_client *clp = dp->dl_client;
1295
1296 printk(KERN_INFO "NFSD: Callback thread failed for "
1297 "for client (clientid %08x/%08x)\n",
1298 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1299 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1300 nfs4_put_delegation(dp);
1301 }
1302}
1303
1304/*
1305 * The file_lock is being reapd.
1306 *
1307 * Called by locks_free_lock() with lock_kernel() held.
1308 */
1309static
1310void nfsd_release_deleg_cb(struct file_lock *fl)
1311{
1312 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1313
1314 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1315
1316 if (!(fl->fl_flags & FL_LEASE) || !dp)
1317 return;
1318 dp->dl_flock = NULL;
1319}
1320
1321/*
1322 * Set the delegation file_lock back pointer.
1323 *
a9933cea 1324 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1325 */
1326static
1327void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1328{
1329 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1330
1331 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1332 if (!dp)
1333 return;
1334 dp->dl_flock = new;
1335}
1336
1337/*
a9933cea 1338 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1339 */
1340static
1341int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1342{
1343 struct nfs4_delegation *onlistd =
1344 (struct nfs4_delegation *)onlist->fl_owner;
1345 struct nfs4_delegation *tryd =
1346 (struct nfs4_delegation *)try->fl_owner;
1347
1348 if (onlist->fl_lmops != try->fl_lmops)
1349 return 0;
1350
1351 return onlistd->dl_client == tryd->dl_client;
1352}
1353
1354
1355static
1356int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1357{
1358 if (arg & F_UNLCK)
1359 return lease_modify(onlist, arg);
1360 else
1361 return -EAGAIN;
1362}
1363
fd39ca9a 1364static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1365 .fl_break = nfsd_break_deleg_cb,
1366 .fl_release_private = nfsd_release_deleg_cb,
1367 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1368 .fl_mylease = nfsd_same_client_deleg_cb,
1369 .fl_change = nfsd_change_deleg_cb,
1370};
1371
1372
b37ad28b 1373__be32
1da177e4
LT		 1374nfsd4_process_open1(struct nfsd4_open *open)
1375{
1da177e4
LT		 1376 clientid_t *clientid = &open->op_clientid;
1377 struct nfs4_client *clp = NULL;
1378 unsigned int strhashval;
1379 struct nfs4_stateowner *sop = NULL;
1380
1da177e4 1381 if (!check_name(open->op_owner))
0f442aa2 1382 return nfserr_inval;
1da177e4
LT		 1383
1384 if (STALE_CLIENTID(&open->op_clientid))
1385 return nfserr_stale_clientid;
1386
1387 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1388 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1389 open->op_stateowner = sop;
1390 if (!sop) {
1391 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1392 clp = find_confirmed_client(clientid);
1393 if (clp == NULL)
0f442aa2
BF		 1394 return nfserr_expired;
1395 goto renew;
1da177e4 1396 }
0f442aa2
BF		 1397 if (!sop->so_confirmed) {
1398 /* Replace unconfirmed owners without checking for replay. */
1399 clp = sop->so_client;
1400 release_stateowner(sop);
1401 open->op_stateowner = NULL;
1402 goto renew;
1403 }
1404 if (open->op_seqid == sop->so_seqid - 1) {
1405 if (sop->so_replay.rp_buflen)
a90b061c 1406 return nfserr_replay_me;
0f442aa2
BF		 1407 /* The original OPEN failed so spectacularly
1408 * that we don't even have replay data saved!
1409 * Therefore, we have no choice but to continue
1410 * processing this OPEN; presumably, we'll
1411 * fail again for the same reason.
1412 */
1413 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1414 goto renew;
1415 }
1416 if (open->op_seqid != sop->so_seqid)
1417 return nfserr_bad_seqid;
1da177e4 1418renew:
0f442aa2
BF		 1419 if (open->op_stateowner == NULL) {
1420 sop = alloc_init_open_stateowner(strhashval, clp, open);
1421 if (sop == NULL)
1422 return nfserr_resource;
1423 open->op_stateowner = sop;
1424 }
1425 list_del_init(&sop->so_close_lru);
1da177e4 1426 renew_client(sop->so_client);
0f442aa2 1427 return nfs_ok;
1da177e4
LT		 1428}
1429
b37ad28b 1430static inline __be32
4a6e43e6
N		 1431nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1432{
1433 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1434 return nfserr_openmode;
1435 else
1436 return nfs_ok;
1437}
1438
52f4fb43
N		 1439static struct nfs4_delegation *
1440find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1441{
1442 struct nfs4_delegation *dp;
1443
ea1da636 1444 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1445 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1446 return dp;
1447 }
1448 return NULL;
1449}
1450
b37ad28b 1451static __be32
567d9829
N		 1452nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1453 struct nfs4_delegation **dp)
1454{
1455 int flags;
b37ad28b 1456 __be32 status = nfserr_bad_stateid;
567d9829
N		 1457
1458 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1459 if (*dp == NULL)
c44c5eeb 1460 goto out;
567d9829
N		 1461 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1462 RD_STATE : WR_STATE;
1463 status = nfs4_check_delegmode(*dp, flags);
1464 if (status)
1465 *dp = NULL;
c44c5eeb
N		 1466out:
1467 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1468 return nfs_ok;
1469 if (status)
1470 return status;
1471 open->op_stateowner->so_confirmed = 1;
1472 return nfs_ok;
567d9829
N		 1473}
1474
b37ad28b 1475static __be32
1da177e4
LT		 1476nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1477{
1478 struct nfs4_stateid *local;
b37ad28b 1479 __be32 status = nfserr_share_denied;
1da177e4
LT		 1480 struct nfs4_stateowner *sop = open->op_stateowner;
1481
8beefa24 1482 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1483 /* ignore lock owners */
1484 if (local->st_stateowner->so_is_open_owner == 0)
1485 continue;
1486 /* remember if we have seen this open owner */
1487 if (local->st_stateowner == sop)
1488 *stpp = local;
1489 /* check for conflicting share reservations */
1490 if (!test_share(local, open))
1491 goto out;
1492 }
1493 status = 0;
1494out:
1495 return status;
1496}
1497
5ac049ac
N		 1498static inline struct nfs4_stateid *
1499nfs4_alloc_stateid(void)
1500{
1501 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1502}
1503
b37ad28b 1504static __be32
1da177e4 1505nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1506 struct nfs4_delegation *dp,
1da177e4
LT		 1507 struct svc_fh *cur_fh, int flags)
1508{
1509 struct nfs4_stateid *stp;
1da177e4 1510
5ac049ac 1511 stp = nfs4_alloc_stateid();
1da177e4
LT		 1512 if (stp == NULL)
1513 return nfserr_resource;
1514
567d9829
N		 1515 if (dp) {
1516 get_file(dp->dl_vfs_file);
1517 stp->st_vfs_file = dp->dl_vfs_file;
1518 } else {
b37ad28b 1519 __be32 status;
567d9829
N		 1520 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1521 &stp->st_vfs_file);
1522 if (status) {
1523 if (status == nfserr_dropit)
1524 status = nfserr_jukebox;
5ac049ac 1525 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1526 return status;
1527 }
1da177e4 1528 }
1da177e4
LT		 1529 *stpp = stp;
1530 return 0;
1531}
1532
b37ad28b 1533static inline __be32
1da177e4
LT		 1534nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1535 struct nfsd4_open *open)
1536{
1537 struct iattr iattr = {
1538 .ia_valid = ATTR_SIZE,
1539 .ia_size = 0,
1540 };
1541 if (!open->op_truncate)
1542 return 0;
1543 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1544 return nfserr_inval;
1da177e4
LT		 1545 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1546}
1547
b37ad28b 1548static __be32
1da177e4
LT		 1549nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1550{
1551 struct file *filp = stp->st_vfs_file;
7eaa36e2 1552 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1553 unsigned int share_access, new_writer;
b37ad28b 1554 __be32 status;
1da177e4
LT		 1555
1556 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1557 new_writer = (~share_access) & open->op_share_access
1558 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1559
6c26d08f 1560 if (new_writer) {
b37ad28b
AV		 1561 int err = get_write_access(inode);
1562 if (err)
1563 return nfserrno(err);
6c26d08f 1564 }
1da177e4
LT		 1565 status = nfsd4_truncate(rqstp, cur_fh, open);
1566 if (status) {
6c26d08f
BF		 1567 if (new_writer)
1568 put_write_access(inode);
1da177e4
LT		 1569 return status;
1570 }
1571 /* remember the open */
6c26d08f 1572 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1573 set_bit(open->op_share_access, &stp->st_access_bmap);
1574 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1575
1576 return nfs_ok;
1577}
1578
1579
1da177e4 1580static void
37515177 1581nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1582{
37515177
N		 1583 open->op_stateowner->so_confirmed = 1;
1584 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1585}
1586
1587/*
1588 * Attempt to hand out a delegation.
1589 */
1590static void
1591nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1592{
1593 struct nfs4_delegation *dp;
1594 struct nfs4_stateowner *sop = stp->st_stateowner;
1595 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1596 struct file_lock fl, *flp = &fl;
1597 int status, flag = 0;
1598
1599 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1600 open->op_recall = 0;
1601 switch (open->op_claim_type) {
1602 case NFS4_OPEN_CLAIM_PREVIOUS:
1603 if (!atomic_read(&cb->cb_set))
1604 open->op_recall = 1;
1605 flag = open->op_delegate_type;
1606 if (flag == NFS4_OPEN_DELEGATE_NONE)
1607 goto out;
1608 break;
1609 case NFS4_OPEN_CLAIM_NULL:
1610 /* Let's not give out any delegations till everyone's
1611 * had the chance to reclaim theirs.... */
1612 if (nfs4_in_grace())
1613 goto out;
1614 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1615 goto out;
1616 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1617 flag = NFS4_OPEN_DELEGATE_WRITE;
1618 else
1619 flag = NFS4_OPEN_DELEGATE_READ;
1620 break;
1621 default:
1622 goto out;
1623 }
1da177e4
LT		 1624
1625 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1626 if (dp == NULL) {
1627 flag = NFS4_OPEN_DELEGATE_NONE;
1628 goto out;
1629 }
1630 locks_init_lock(&fl);
1631 fl.fl_lmops = &nfsd_lease_mng_ops;
1632 fl.fl_flags = FL_LEASE;
1633 fl.fl_end = OFFSET_MAX;
1634 fl.fl_owner = (fl_owner_t)dp;
1635 fl.fl_file = stp->st_vfs_file;
1636 fl.fl_pid = current->tgid;
1637
a9933cea 1638 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1639 * the lock_manager callbacks fl_mylease and fl_change are used
1640 */
a9933cea 1641 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1642 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1643 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1644 unhash_delegation(dp);
1da177e4
LT		 1645 flag = NFS4_OPEN_DELEGATE_NONE;
1646 goto out;
1647 }
1648
1649 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1650
1651 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1652 dp->dl_stateid.si_boot,
1653 dp->dl_stateid.si_stateownerid,
1654 dp->dl_stateid.si_fileid,
1655 dp->dl_stateid.si_generation);
1656out:
7b190fec
N		 1657 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1658 && flag == NFS4_OPEN_DELEGATE_NONE
1659 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1660 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1661 open->op_delegate_type = flag;
1662}
1663
1664/*
1665 * called with nfs4_lock_state() held.
1666 */
b37ad28b 1667__be32
1da177e4
LT		 1668nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1669{
1670 struct nfs4_file *fp = NULL;
1671 struct inode *ino = current_fh->fh_dentry->d_inode;
1672 struct nfs4_stateid *stp = NULL;
567d9829 1673 struct nfs4_delegation *dp = NULL;
b37ad28b 1674 __be32 status;
1da177e4
LT		 1675
1676 status = nfserr_inval;
ba5a6a19
BF		 1677 if (!access_valid(open->op_share_access)
1678 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1679 goto out;
1680 /*
1681 * Lookup file; if found, lookup stateid and check open request,
1682 * and check for delegations in the process of being recalled.
1683 * If not found, create the nfs4_file struct
1684 */
1685 fp = find_file(ino);
1686 if (fp) {
1687 if ((status = nfs4_check_open(fp, open, &stp)))
1688 goto out;
c44c5eeb
N		 1689 status = nfs4_check_deleg(fp, open, &dp);
1690 if (status)
1691 goto out;
1da177e4 1692 } else {
c44c5eeb
N		 1693 status = nfserr_bad_stateid;
1694 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1695 goto out;
1da177e4
LT		 1696 status = nfserr_resource;
1697 fp = alloc_init_file(ino);
1698 if (fp == NULL)
1699 goto out;
1700 }
1701
1702 /*
1703 * OPEN the file, or upgrade an existing OPEN.
1704 * If truncate fails, the OPEN fails.
1705 */
1706 if (stp) {
1707 /* Stateid was found, this is an OPEN upgrade */
1708 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1709 if (status)
1710 goto out;
444c2c07 1711 update_stateid(&stp->st_stateid);
1da177e4
LT		 1712 } else {
1713 /* Stateid was not found, this is a new OPEN */
1714 int flags = 0;
9ecb6a08
BF		 1715 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1716 flags |= MAY_READ;
1da177e4 1717 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1718 flags |= MAY_WRITE;
567d9829
N		 1719 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1720 if (status)
1da177e4
LT		 1721 goto out;
1722 init_stateid(stp, fp, open);
1723 status = nfsd4_truncate(rqstp, current_fh, open);
1724 if (status) {
1725 release_stateid(stp, OPEN_STATE);
1726 goto out;
1727 }
1728 }
1729 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1730
1731 /*
1732 * Attempt to hand out a delegation. No error return, because the
1733 * OPEN succeeds even if we fail.
1734 */
1735 nfs4_open_delegation(current_fh, open, stp);
1736
1737 status = nfs_ok;
1738
1739 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1740 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1741 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1742out:
13cd2184
N		 1743 if (fp)
1744 put_nfs4_file(fp);
37515177
N		 1745 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1746 nfs4_set_claim_prev(open);
1da177e4
LT		 1747 /*
1748 * To finish the open response, we just need to set the rflags.
1749 */
1750 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1751 if (!open->op_stateowner->so_confirmed)
1752 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1753
1754 return status;
1755}
1756
58da282b 1757static struct workqueue_struct *laundry_wq;
c4028958
DH		 1758static void laundromat_main(struct work_struct *);
1759static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1760
b37ad28b 1761__be32
b591480b
BF		 1762nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1763 clientid_t *clid)
1da177e4
LT		 1764{
1765 struct nfs4_client *clp;
b37ad28b 1766 __be32 status;
1da177e4
LT		 1767
1768 nfs4_lock_state();
1769 dprintk("process_renew(%08x/%08x): starting\n",
1770 clid->cl_boot, clid->cl_id);
1771 status = nfserr_stale_clientid;
1772 if (STALE_CLIENTID(clid))
1773 goto out;
1774 clp = find_confirmed_client(clid);
1775 status = nfserr_expired;
1776 if (clp == NULL) {
1777 /* We assume the client took too long to RENEW. */
1778 dprintk("nfsd4_renew: clientid not found!\n");
1779 goto out;
1780 }
1781 renew_client(clp);
1782 status = nfserr_cb_path_down;
ea1da636 1783 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1784 && !atomic_read(&clp->cl_callback.cb_set))
1785 goto out;
1786 status = nfs_ok;
1787out:
1788 nfs4_unlock_state();
1789 return status;
1790}
1791
a76b4319
N		 1792static void
1793end_grace(void)
1794{
1795 dprintk("NFSD: end of grace period\n");
c7b9a459 1796 nfsd4_recdir_purge_old();
a76b4319
N		 1797 in_grace = 0;
1798}
1799
fd39ca9a 1800static time_t
1da177e4
LT		 1801nfs4_laundromat(void)
1802{
1803 struct nfs4_client *clp;
1804 struct nfs4_stateowner *sop;
1805 struct nfs4_delegation *dp;
1806 struct list_head *pos, *next, reaplist;
1807 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1808 time_t t, clientid_val = NFSD_LEASE_TIME;
1809 time_t u, test_val = NFSD_LEASE_TIME;
1810
1811 nfs4_lock_state();
1812
1813 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1814 if (in_grace)
1815 end_grace();
1da177e4
LT		 1816 list_for_each_safe(pos, next, &client_lru) {
1817 clp = list_entry(pos, struct nfs4_client, cl_lru);
1818 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1819 t = clp->cl_time - cutoff;
1820 if (clientid_val > t)
1821 clientid_val = t;
1822 break;
1823 }
1824 dprintk("NFSD: purging unused client (clientid %08x)\n",
1825 clp->cl_clientid.cl_id);
c7b9a459 1826 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1827 expire_client(clp);
1828 }
1829 INIT_LIST_HEAD(&reaplist);
1830 spin_lock(&recall_lock);
1831 list_for_each_safe(pos, next, &del_recall_lru) {
1832 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1833 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1834 u = dp->dl_time - cutoff;
1835 if (test_val > u)
1836 test_val = u;
1837 break;
1838 }
1839 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1840 dp, dp->dl_flock);
1841 list_move(&dp->dl_recall_lru, &reaplist);
1842 }
1843 spin_unlock(&recall_lock);
1844 list_for_each_safe(pos, next, &reaplist) {
1845 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1846 list_del_init(&dp->dl_recall_lru);
1847 unhash_delegation(dp);
1848 }
1849 test_val = NFSD_LEASE_TIME;
1850 list_for_each_safe(pos, next, &close_lru) {
1851 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1852 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1853 u = sop->so_time - cutoff;
1854 if (test_val > u)
1855 test_val = u;
1856 break;
1857 }
1858 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1859 sop->so_id);
358dd55a 1860 release_stateowner(sop);
1da177e4
LT		 1861 }
1862 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1863 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1864 nfs4_unlock_state();
1865 return clientid_val;
1866}
1867
1868void
c4028958 1869laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1870{
1871 time_t t;
1872
1873 t = nfs4_laundromat();
1874 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1875 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1876}
1877
fd39ca9a 1878static struct nfs4_stateowner *
f8816512
N		 1879search_close_lru(u32 st_id, int flags)
1880{
1da177e4
LT		 1881 struct nfs4_stateowner *local = NULL;
1882
1da177e4
LT		 1883 if (flags & CLOSE_STATE) {
1884 list_for_each_entry(local, &close_lru, so_close_lru) {
1885 if (local->so_id == st_id)
1886 return local;
1887 }
1888 }
1889 return NULL;
1890}
1891
1892static inline int
1893nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1894{
7eaa36e2 1895 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1896}
1897
1898static int
1899STALE_STATEID(stateid_t *stateid)
1900{
1901 if (stateid->si_boot == boot_time)
1902 return 0;
849823c5 1903 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1904 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1905 stateid->si_generation);
1906 return 1;
1907}
1908
1909static inline int
1910access_permit_read(unsigned long access_bmap)
1911{
1912 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1913 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1914 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1915}
1916
1917static inline int
1918access_permit_write(unsigned long access_bmap)
1919{
1920 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1921 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1922}
1923
1924static
b37ad28b 1925__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1926{
b37ad28b 1927 __be32 status = nfserr_openmode;
1da177e4
LT		 1928
1929 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1930 goto out;
1931 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1932 goto out;
1933 status = nfs_ok;
1934out:
1935 return status;
1936}
1937
b37ad28b 1938static inline __be32
1da177e4
LT		 1939check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1940{
1941 /* Trying to call delegreturn with a special stateid? Yuch: */
1942 if (!(flags & (RD_STATE | WR_STATE)))
1943 return nfserr_bad_stateid;
1944 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1945 return nfs_ok;
1946 else if (nfs4_in_grace()) {
1947 /* Answer in remaining cases depends on existance of
1948 * conflicting state; so we must wait out the grace period. */
1949 return nfserr_grace;
1950 } else if (flags & WR_STATE)
1951 return nfs4_share_conflict(current_fh,
1952 NFS4_SHARE_DENY_WRITE);
1953 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1954 return nfs4_share_conflict(current_fh,
1955 NFS4_SHARE_DENY_READ);
1956}
1957
1958/*
1959 * Allow READ/WRITE during grace period on recovered state only for files
1960 * that are not able to provide mandatory locking.
1961 */
1962static inline int
1963io_during_grace_disallowed(struct inode *inode, int flags)
1964{
1965 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 1966 && mandatory_lock(inode);
1da177e4
LT		 1967}
1968
1969/*
1970* Checks for stateid operations
1971*/
b37ad28b 1972__be32
1da177e4
LT		 1973nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1974{
1975 struct nfs4_stateid *stp = NULL;
1976 struct nfs4_delegation *dp = NULL;
1977 stateid_t *stidp;
1978 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 1979 __be32 status;
1da177e4
LT		 1980
1981 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1982 stateid->si_boot, stateid->si_stateownerid,
1983 stateid->si_fileid, stateid->si_generation);
1984 if (filpp)
1985 *filpp = NULL;
1986
1987 if (io_during_grace_disallowed(ino, flags))
1988 return nfserr_grace;
1989
1990 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
1991 return check_special_stateids(current_fh, stateid, flags);
1992
1993 /* STALE STATEID */
1994 status = nfserr_stale_stateid;
1995 if (STALE_STATEID(stateid))
1996 goto out;
1997
1998 /* BAD STATEID */
1999 status = nfserr_bad_stateid;
2000 if (!stateid->si_fileid) { /* delegation stateid */
2001 if(!(dp = find_delegation_stateid(ino, stateid))) {
2002 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2003 goto out;
2004 }
2005 stidp = &dp->dl_stateid;
2006 } else { /* open or lock stateid */
2007 if (!(stp = find_stateid(stateid, flags))) {
2008 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2009 goto out;
2010 }
2011 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2012 goto out;
2013 if (!stp->st_stateowner->so_confirmed)
2014 goto out;
2015 stidp = &stp->st_stateid;
2016 }
2017 if (stateid->si_generation > stidp->si_generation)
2018 goto out;
2019
2020 /* OLD STATEID */
2021 status = nfserr_old_stateid;
2022 if (stateid->si_generation < stidp->si_generation)
2023 goto out;
2024 if (stp) {
2025 if ((status = nfs4_check_openmode(stp,flags)))
2026 goto out;
2027 renew_client(stp->st_stateowner->so_client);
2028 if (filpp)
2029 *filpp = stp->st_vfs_file;
2030 } else if (dp) {
2031 if ((status = nfs4_check_delegmode(dp, flags)))
2032 goto out;
2033 renew_client(dp->dl_client);
2034 if (flags & DELEG_RET)
2035 unhash_delegation(dp);
2036 if (filpp)
2037 *filpp = dp->dl_vfs_file;
2038 }
2039 status = nfs_ok;
2040out:
2041 return status;
2042}
2043
4c4cd222
N		 2044static inline int
2045setlkflg (int type)
2046{
2047 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2048 RD_STATE : WR_STATE;
2049}
1da177e4
LT		 2050
2051/*
2052 * Checks for sequence id mutating operations.
2053 */
b37ad28b 2054static __be32
4c4cd222 2055nfs4_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 2056{
1da177e4
LT		 2057 struct nfs4_stateid *stp;
2058 struct nfs4_stateowner *sop;
2059
2060 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2061 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2062 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2063 stateid->si_generation);
3a4f98bb 2064
1da177e4
LT		 2065 *stpp = NULL;
2066 *sopp = NULL;
2067
1da177e4 2068 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2069 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2070 return nfserr_bad_stateid;
1da177e4
LT		 2071 }
2072
1da177e4 2073 if (STALE_STATEID(stateid))
3a4f98bb 2074 return nfserr_stale_stateid;
1da177e4
LT		 2075 /*
2076 * We return BAD_STATEID if filehandle doesn't match stateid,
2077 * the confirmed flag is incorrecly set, or the generation
2078 * number is incorrect.
1da177e4 2079 */
f8816512
N		 2080 stp = find_stateid(stateid, flags);
2081 if (stp == NULL) {
2082 /*
2083 * Also, we should make sure this isn't just the result of
2084 * a replayed close:
2085 */
2086 sop = search_close_lru(stateid->si_stateownerid, flags);
2087 if (sop == NULL)
2088 return nfserr_bad_stateid;
2089 *sopp = sop;
2090 goto check_replay;
2091 }
1da177e4 2092
4c4cd222 2093 if (lock) {
1da177e4 2094 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2095 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2096 struct nfs4_client *clp = sop->so_client;
4c4cd222 2097 int lkflg = 0;
b37ad28b 2098 __be32 status;
4c4cd222
N		 2099
2100 lkflg = setlkflg(lock->lk_type);
2101
2102 if (lock->lk_is_new) {
599e0a22
BF		 2103 if (!sop->so_is_open_owner)
2104 return nfserr_bad_stateid;
2105 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2106 return nfserr_bad_stateid;
599e0a22
BF		 2107 /* stp is the open stateid */
2108 status = nfs4_check_openmode(stp, lkflg);
2109 if (status)
2110 return status;
2111 } else {
2112 /* stp is the lock stateid */
2113 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2114 if (status)
2115 return status;
4c4cd222 2116 }
1da177e4
LT		 2117 }
2118
2119 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2fdada03 2120 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2121 return nfserr_bad_stateid;
1da177e4
LT		 2122 }
2123
2124 *stpp = stp;
2125 *sopp = sop = stp->st_stateowner;
2126
2127 /*
2128 * We now validate the seqid and stateid generation numbers.
2129 * For the moment, we ignore the possibility of
2130 * generation number wraparound.
2131 */
bd9aac52 2132 if (seqid != sop->so_seqid)
1da177e4
LT		 2133 goto check_replay;
2134
3a4f98bb 2135 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2136 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2137 " unconfirmed stateowner!\n");
2138 return nfserr_bad_stateid;
1da177e4 2139 }
3a4f98bb 2140 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2141 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2142 " confirmed yet!\n");
2143 return nfserr_bad_stateid;
1da177e4
LT		 2144 }
2145 if (stateid->si_generation > stp->st_stateid.si_generation) {
2fdada03 2146 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2147 return nfserr_bad_stateid;
1da177e4
LT		 2148 }
2149
1da177e4 2150 if (stateid->si_generation < stp->st_stateid.si_generation) {
2fdada03 2151 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2152 return nfserr_old_stateid;
1da177e4 2153 }
52fd004e 2154 renew_client(sop->so_client);
3a4f98bb 2155 return nfs_ok;
1da177e4 2156
1da177e4 2157check_replay:
bd9aac52 2158 if (seqid == sop->so_seqid - 1) {
849823c5 2159 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2160 /* indicate replay to calling function */
a90b061c 2161 return nfserr_replay_me;
1da177e4 2162 }
2fdada03 2163 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2164 sop->so_seqid, seqid);
2165 *sopp = NULL;
2166 return nfserr_bad_seqid;
1da177e4
LT		 2167}
2168
b37ad28b 2169__be32
ca364317 2170nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2171 struct nfsd4_open_confirm *oc)
1da177e4 2172{
b37ad28b 2173 __be32 status;
1da177e4
LT		 2174 struct nfs4_stateowner *sop;
2175 struct nfs4_stateid *stp;
2176
2177 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2178 (int)cstate->current_fh.fh_dentry->d_name.len,
2179 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2180
ca364317 2181 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2182 if (status)
2183 return status;
1da177e4
LT		 2184
2185 nfs4_lock_state();
2186
ca364317
BF		 2187 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2188 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2189 CHECK_FH | CONFIRM | OPEN_STATE,
2190 &oc->oc_stateowner, &stp, NULL)))
2191 goto out;
2192
2193 sop = oc->oc_stateowner;
2194 sop->so_confirmed = 1;
2195 update_stateid(&stp->st_stateid);
2196 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2197 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2198 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2199 stp->st_stateid.si_boot,
2200 stp->st_stateid.si_stateownerid,
2201 stp->st_stateid.si_fileid,
2202 stp->st_stateid.si_generation);
c7b9a459
N		 2203
2204 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2205out:
f2327d9a 2206 if (oc->oc_stateowner) {
1da177e4 2207 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2208 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2209 }
1da177e4
LT		 2210 nfs4_unlock_state();
2211 return status;
2212}
2213
2214
2215/*
2216 * unset all bits in union bitmap (bmap) that
2217 * do not exist in share (from successful OPEN_DOWNGRADE)
2218 */
2219static void
2220reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2221{
2222 int i;
2223 for (i = 1; i < 4; i++) {
2224 if ((i & access) != i)
2225 __clear_bit(i, bmap);
2226 }
2227}
2228
2229static void
2230reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2231{
2232 int i;
2233 for (i = 0; i < 4; i++) {
2234 if ((i & deny) != i)
2235 __clear_bit(i, bmap);
2236 }
2237}
2238
b37ad28b 2239__be32
ca364317
BF		 2240nfsd4_open_downgrade(struct svc_rqst *rqstp,
2241 struct nfsd4_compound_state *cstate,
a4f1706a 2242 struct nfsd4_open_downgrade *od)
1da177e4 2243{
b37ad28b 2244 __be32 status;
1da177e4
LT		 2245 struct nfs4_stateid *stp;
2246 unsigned int share_access;
2247
2248 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2249 (int)cstate->current_fh.fh_dentry->d_name.len,
2250 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2251
ba5a6a19
BF		 2252 if (!access_valid(od->od_share_access)
2253 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2254 return nfserr_inval;
2255
2256 nfs4_lock_state();
ca364317
BF		 2257 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2258 od->od_seqid,
1da177e4
LT		 2259 &od->od_stateid,
2260 CHECK_FH | OPEN_STATE,
2261 &od->od_stateowner, &stp, NULL)))
2262 goto out;
2263
2264 status = nfserr_inval;
2265 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2266 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2267 stp->st_access_bmap, od->od_share_access);
2268 goto out;
2269 }
2270 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2271 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2272 stp->st_deny_bmap, od->od_share_deny);
2273 goto out;
2274 }
2275 set_access(&share_access, stp->st_access_bmap);
2276 nfs4_file_downgrade(stp->st_vfs_file,
2277 share_access & ~od->od_share_access);
2278
2279 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2280 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2281
2282 update_stateid(&stp->st_stateid);
2283 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2284 status = nfs_ok;
2285out:
f2327d9a 2286 if (od->od_stateowner) {
1da177e4 2287 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2288 cstate->replay_owner = od->od_stateowner;
f2327d9a 2289 }
1da177e4
LT		 2290 nfs4_unlock_state();
2291 return status;
2292}
2293
2294/*
2295 * nfs4_unlock_state() called after encode
2296 */
b37ad28b 2297__be32
ca364317 2298nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2299 struct nfsd4_close *close)
1da177e4 2300{
b37ad28b 2301 __be32 status;
1da177e4
LT		 2302 struct nfs4_stateid *stp;
2303
2304 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2305 (int)cstate->current_fh.fh_dentry->d_name.len,
2306 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2307
2308 nfs4_lock_state();
2309 /* check close_lru for replay */
ca364317
BF		 2310 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2311 close->cl_seqid,
1da177e4
LT		 2312 &close->cl_stateid,
2313 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2314 &close->cl_stateowner, &stp, NULL)))
2315 goto out;
1da177e4
LT		 2316 status = nfs_ok;
2317 update_stateid(&stp->st_stateid);
2318 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2319
04ef5954
BF		 2320 /* release_stateid() calls nfsd_close() if needed */
2321 release_stateid(stp, OPEN_STATE);
2322
2323 /* place unused nfs4_stateowners on so_close_lru list to be
2324 * released by the laundromat service after the lease period
2325 * to enable us to handle CLOSE replay
2326 */
2327 if (list_empty(&close->cl_stateowner->so_stateids))
2328 move_to_close_lru(close->cl_stateowner);
1da177e4 2329out:
f2327d9a 2330 if (close->cl_stateowner) {
1da177e4 2331 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2332 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2333 }
1da177e4
LT		 2334 nfs4_unlock_state();
2335 return status;
2336}
2337
b37ad28b 2338__be32
ca364317
BF		 2339nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2340 struct nfsd4_delegreturn *dr)
1da177e4 2341{
b37ad28b 2342 __be32 status;
1da177e4 2343
ca364317 2344 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2345 goto out;
2346
2347 nfs4_lock_state();
ca364317
BF		 2348 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2349 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2350 nfs4_unlock_state();
2351out:
2352 return status;
2353}
2354
2355
2356/*
2357 * Lock owner state (byte-range locks)
2358 */
2359#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2360#define LOCK_HASH_BITS 8
2361#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2362#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2363
2364#define lockownerid_hashval(id) \
2365 ((id) & LOCK_HASH_MASK)
2366
2367static inline unsigned int
2368lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2369 struct xdr_netobj *ownername)
2370{
2371 return (file_hashval(inode) + cl_id
2372 + opaque_hashval(ownername->data, ownername->len))
2373 & LOCK_HASH_MASK;
2374}
2375
2376static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2377static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2378static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2379
fd39ca9a 2380static struct nfs4_stateid *
1da177e4
LT		 2381find_stateid(stateid_t *stid, int flags)
2382{
2383 struct nfs4_stateid *local = NULL;
2384 u32 st_id = stid->si_stateownerid;
2385 u32 f_id = stid->si_fileid;
2386 unsigned int hashval;
2387
2388 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2389 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2390 hashval = stateid_hashval(st_id, f_id);
2391 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2392 if ((local->st_stateid.si_stateownerid == st_id) &&
2393 (local->st_stateid.si_fileid == f_id))
2394 return local;
2395 }
2396 }
2397 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2398 hashval = stateid_hashval(st_id, f_id);
2399 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2400 if ((local->st_stateid.si_stateownerid == st_id) &&
2401 (local->st_stateid.si_fileid == f_id))
2402 return local;
2403 }
849823c5 2404 }
1da177e4
LT		 2405 return NULL;
2406}
2407
2408static struct nfs4_delegation *
2409find_delegation_stateid(struct inode *ino, stateid_t *stid)
2410{
13cd2184
N		 2411 struct nfs4_file *fp;
2412 struct nfs4_delegation *dl;
1da177e4
LT		 2413
2414 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2415 stid->si_boot, stid->si_stateownerid,
2416 stid->si_fileid, stid->si_generation);
2417
1da177e4 2418 fp = find_file(ino);
13cd2184
N		 2419 if (!fp)
2420 return NULL;
2421 dl = find_delegation_file(fp, stid);
2422 put_nfs4_file(fp);
2423 return dl;
1da177e4
LT		 2424}
2425
2426/*
2427 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2428 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2429 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2430 * locking, this prevents us from being completely protocol-compliant. The
2431 * real solution to this problem is to start using unsigned file offsets in
2432 * the VFS, but this is a very deep change!
2433 */
2434static inline void
2435nfs4_transform_lock_offset(struct file_lock *lock)
2436{
2437 if (lock->fl_start < 0)
2438 lock->fl_start = OFFSET_MAX;
2439 if (lock->fl_end < 0)
2440 lock->fl_end = OFFSET_MAX;
2441}
2442
d5b9026a
N		 2443/* Hack!: For now, we're defining this just so we can use a pointer to it
2444 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2445static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2446};
1da177e4
LT		 2447
2448static inline void
2449nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2450{
d5b9026a
N		 2451 struct nfs4_stateowner *sop;
2452 unsigned int hval;
1da177e4 2453
d5b9026a
N		 2454 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2455 sop = (struct nfs4_stateowner *) fl->fl_owner;
2456 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2457 kref_get(&sop->so_ref);
2458 deny->ld_sop = sop;
2459 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2460 } else {
2461 deny->ld_sop = NULL;
2462 deny->ld_clientid.cl_boot = 0;
2463 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2464 }
2465 deny->ld_start = fl->fl_start;
2466 deny->ld_length = ~(u64)0;
2467 if (fl->fl_end != ~(u64)0)
2468 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2469 deny->ld_type = NFS4_READ_LT;
2470 if (fl->fl_type != F_RDLCK)
2471 deny->ld_type = NFS4_WRITE_LT;
2472}
2473
1da177e4
LT		 2474static struct nfs4_stateowner *
2475find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2476 struct xdr_netobj *owner)
2477{
2478 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2479 struct nfs4_stateowner *op;
2480
2481 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2482 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2483 return op;
2484 }
2485 return NULL;
2486}
2487
2488/*
2489 * Alloc a lock owner structure.
2490 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2491 * occured.
2492 *
2493 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2494 */
2495
2496static struct nfs4_stateowner *
2497alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2498 struct nfs4_stateowner *sop;
2499 struct nfs4_replay *rp;
2500 unsigned int idhashval;
2501
2502 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2503 return NULL;
2504 idhashval = lockownerid_hashval(current_ownerid);
2505 INIT_LIST_HEAD(&sop->so_idhash);
2506 INIT_LIST_HEAD(&sop->so_strhash);
2507 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2508 INIT_LIST_HEAD(&sop->so_stateids);
2509 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2510 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2511 sop->so_time = 0;
2512 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2513 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2514 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2515 sop->so_is_open_owner = 0;
2516 sop->so_id = current_ownerid++;
2517 sop->so_client = clp;
b59e3c0e
NB		 2518 /* It is the openowner seqid that will be incremented in encode in the
2519 * case of new lockowners; so increment the lock seqid manually: */
2520 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2521 sop->so_confirmed = 1;
2522 rp = &sop->so_replay;
de1ae286 2523 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2524 rp->rp_buflen = 0;
2525 rp->rp_buf = rp->rp_ibuf;
2526 return sop;
2527}
2528
fd39ca9a 2529static struct nfs4_stateid *
1da177e4
LT		 2530alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2531{
2532 struct nfs4_stateid *stp;
2533 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2534
5ac049ac
N		 2535 stp = nfs4_alloc_stateid();
2536 if (stp == NULL)
1da177e4
LT		 2537 goto out;
2538 INIT_LIST_HEAD(&stp->st_hash);
2539 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2540 INIT_LIST_HEAD(&stp->st_perstateowner);
2541 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2542 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2543 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2544 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2545 stp->st_stateowner = sop;
13cd2184 2546 get_nfs4_file(fp);
1da177e4
LT		 2547 stp->st_file = fp;
2548 stp->st_stateid.si_boot = boot_time;
2549 stp->st_stateid.si_stateownerid = sop->so_id;
2550 stp->st_stateid.si_fileid = fp->fi_id;
2551 stp->st_stateid.si_generation = 0;
2552 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2553 stp->st_access_bmap = open_stp->st_access_bmap;
2554 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2555 stp->st_openstp = open_stp;
1da177e4
LT		 2556
2557out:
2558 return stp;
2559}
2560
fd39ca9a 2561static int
1da177e4
LT		 2562check_lock_length(u64 offset, u64 length)
2563{
2564 return ((length == 0) || ((length != ~(u64)0) &&
2565 LOFF_OVERFLOW(offset, length)));
2566}
2567
2568/*
2569 * LOCK operation
2570 */
b37ad28b 2571__be32
ca364317 2572nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2573 struct nfsd4_lock *lock)
1da177e4 2574{
3e9e3dbe 2575 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2576 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2577 struct nfs4_stateid *lock_stp;
2578 struct file *filp;
2579 struct file_lock file_lock;
8dc7c311 2580 struct file_lock conflock;
b37ad28b 2581 __be32 status = 0;
1da177e4 2582 unsigned int strhashval;
150b3934 2583 unsigned int cmd;
b8dd7b9a 2584 int err;
1da177e4
LT		 2585
2586 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2587 (long long) lock->lk_offset,
2588 (long long) lock->lk_length);
2589
1da177e4
LT		 2590 if (check_lock_length(lock->lk_offset, lock->lk_length))
2591 return nfserr_inval;
2592
ca364317
BF		 2593 if ((status = fh_verify(rqstp, &cstate->current_fh,
2594 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2595 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2596 return status;
2597 }
2598
1da177e4
LT		 2599 nfs4_lock_state();
2600
2601 if (lock->lk_is_new) {
893f8770
N		 2602 /*
2603 * Client indicates that this is a new lockowner.
2604 * Use open owner and open stateid to create lock owner and
2605 * lock stateid.
2606 */
1da177e4
LT		 2607 struct nfs4_stateid *open_stp = NULL;
2608 struct nfs4_file *fp;
2609
2610 status = nfserr_stale_clientid;
849823c5 2611 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2612 goto out;
1da177e4 2613
1da177e4 2614 /* validate and update open stateid and open seqid */
ca364317 2615 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2616 lock->lk_new_open_seqid,
2617 &lock->lk_new_open_stateid,
2618 CHECK_FH | OPEN_STATE,
3a65588a 2619 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2620 lock);
37515177 2621 if (status)
1da177e4 2622 goto out;
3a65588a 2623 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2624 /* create lockowner and lock stateid */
2625 fp = open_stp->st_file;
2626 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2627 open_sop->so_client->cl_clientid.cl_id,
2628 &lock->v.new.owner);
3e9e3dbe
N		 2629 /* XXX: Do we need to check for duplicate stateowners on
2630 * the same file, or should they just be allowed (and
2631 * create new stateids)? */
1da177e4 2632 status = nfserr_resource;
b59e3c0e
NB		 2633 lock_sop = alloc_init_lock_stateowner(strhashval,
2634 open_sop->so_client, open_stp, lock);
2635 if (lock_sop == NULL)
1da177e4 2636 goto out;
b59e3c0e 2637 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2638 if (lock_stp == NULL)
1da177e4 2639 goto out;
1da177e4
LT		 2640 } else {
2641 /* lock (lock owner + lock stateid) already exists */
ca364317 2642 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2643 lock->lk_old_lock_seqid,
2644 &lock->lk_old_lock_stateid,
2645 CHECK_FH | LOCK_STATE,
3a65588a 2646 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2647 if (status)
2648 goto out;
3a65588a 2649 lock_sop = lock->lk_replay_owner;
1da177e4 2650 }
3a65588a 2651 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2652 filp = lock_stp->st_vfs_file;
2653
0dd395dc
N		 2654 status = nfserr_grace;
2655 if (nfs4_in_grace() && !lock->lk_reclaim)
2656 goto out;
2657 status = nfserr_no_grace;
2658 if (!nfs4_in_grace() && lock->lk_reclaim)
2659 goto out;
2660
1da177e4
LT		 2661 locks_init_lock(&file_lock);
2662 switch (lock->lk_type) {
2663 case NFS4_READ_LT:
2664 case NFS4_READW_LT:
2665 file_lock.fl_type = F_RDLCK;
150b3934 2666 cmd = F_SETLK;
1da177e4
LT		 2667 break;
2668 case NFS4_WRITE_LT:
2669 case NFS4_WRITEW_LT:
2670 file_lock.fl_type = F_WRLCK;
150b3934 2671 cmd = F_SETLK;
1da177e4
LT		 2672 break;
2673 default:
2674 status = nfserr_inval;
2675 goto out;
2676 }
b59e3c0e 2677 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2678 file_lock.fl_pid = current->tgid;
2679 file_lock.fl_file = filp;
2680 file_lock.fl_flags = FL_POSIX;
d5b9026a 2681 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2682
2683 file_lock.fl_start = lock->lk_offset;
2684 if ((lock->lk_length == ~(u64)0) ||
2685 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2686 file_lock.fl_end = ~(u64)0;
2687 else
2688 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2689 nfs4_transform_lock_offset(&file_lock);
2690
2691 /*
2692 * Try to lock the file in the VFS.
2693 * Note: locks.c uses the BKL to protect the inode's lock list.
2694 */
2695
eb76b3fd
AA		 2696 /* XXX?: Just to divert the locks_release_private at the start of
2697 * locks_copy_lock: */
150b3934 2698 locks_init_lock(&conflock);
fd85b817 2699 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2700 switch (-err) {
1da177e4
LT		 2701 case 0: /* success! */
2702 update_stateid(&lock_stp->st_stateid);
2703 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2704 sizeof(stateid_t));
b8dd7b9a 2705 status = 0;
eb76b3fd
AA		 2706 break;
2707 case (EAGAIN): /* conflock holds conflicting lock */
2708 status = nfserr_denied;
2709 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2710 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2711 break;
1da177e4
LT		 2712 case (EDEADLK):
2713 status = nfserr_deadlock;
eb76b3fd 2714 break;
1da177e4 2715 default:
fd85b817 2716 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2717 status = nfserr_resource;
2718 break;
1da177e4 2719 }
1da177e4 2720out:
8a280510
BF		 2721 if (status && lock->lk_is_new && lock_sop)
2722 release_stateowner(lock_sop);
3a65588a
BF		 2723 if (lock->lk_replay_owner) {
2724 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2725 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2726 }
1da177e4
LT		 2727 nfs4_unlock_state();
2728 return status;
2729}
2730
2731/*
2732 * LOCKT operation
2733 */
b37ad28b 2734__be32
ca364317
BF		 2735nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2736 struct nfsd4_lockt *lockt)
1da177e4
LT		 2737{
2738 struct inode *inode;
2739 struct file file;
2740 struct file_lock file_lock;
fd85b817 2741 int error;
b37ad28b 2742 __be32 status;
1da177e4
LT		 2743
2744 if (nfs4_in_grace())
2745 return nfserr_grace;
2746
2747 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2748 return nfserr_inval;
2749
2750 lockt->lt_stateowner = NULL;
2751 nfs4_lock_state();
2752
2753 status = nfserr_stale_clientid;
849823c5 2754 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2755 goto out;
1da177e4 2756
ca364317 2757 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2758 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2759 if (status == nfserr_symlink)
2760 status = nfserr_inval;
2761 goto out;
2762 }
2763
ca364317 2764 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2765 locks_init_lock(&file_lock);
2766 switch (lockt->lt_type) {
2767 case NFS4_READ_LT:
2768 case NFS4_READW_LT:
2769 file_lock.fl_type = F_RDLCK;
2770 break;
2771 case NFS4_WRITE_LT:
2772 case NFS4_WRITEW_LT:
2773 file_lock.fl_type = F_WRLCK;
2774 break;
2775 default:
2fdada03 2776 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2777 status = nfserr_inval;
2778 goto out;
2779 }
2780
2781 lockt->lt_stateowner = find_lockstateowner_str(inode,
2782 &lockt->lt_clientid, &lockt->lt_owner);
2783 if (lockt->lt_stateowner)
2784 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2785 file_lock.fl_pid = current->tgid;
2786 file_lock.fl_flags = FL_POSIX;
d5b9026a 2787 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2788
2789 file_lock.fl_start = lockt->lt_offset;
2790 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2791 file_lock.fl_end = ~(u64)0;
2792 else
2793 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2794
2795 nfs4_transform_lock_offset(&file_lock);
2796
fd85b817 2797 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2798 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2799 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2800 * only the dentry:inode set.
2801 */
2802 memset(&file, 0, sizeof (struct file));
ca364317 2803 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2804
2805 status = nfs_ok;
fd85b817
ME		 2806 error = vfs_test_lock(&file, &file_lock);
2807 if (error) {
2808 status = nfserrno(error);
2809 goto out;
2810 }
9d6a8c5c 2811 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2812 status = nfserr_denied;
9d6a8c5c 2813 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2814 }
2815out:
2816 nfs4_unlock_state();
2817 return status;
2818}
2819
b37ad28b 2820__be32
ca364317 2821nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2822 struct nfsd4_locku *locku)
1da177e4
LT		 2823{
2824 struct nfs4_stateid *stp;
2825 struct file *filp = NULL;
2826 struct file_lock file_lock;
b37ad28b 2827 __be32 status;
b8dd7b9a 2828 int err;
1da177e4
LT		 2829
2830 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2831 (long long) locku->lu_offset,
2832 (long long) locku->lu_length);
2833
2834 if (check_lock_length(locku->lu_offset, locku->lu_length))
2835 return nfserr_inval;
2836
2837 nfs4_lock_state();
2838
ca364317 2839 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2840 locku->lu_seqid,
2841 &locku->lu_stateid,
2842 CHECK_FH | LOCK_STATE,
2843 &locku->lu_stateowner, &stp, NULL)))
2844 goto out;
2845
2846 filp = stp->st_vfs_file;
2847 BUG_ON(!filp);
2848 locks_init_lock(&file_lock);
2849 file_lock.fl_type = F_UNLCK;
2850 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2851 file_lock.fl_pid = current->tgid;
2852 file_lock.fl_file = filp;
2853 file_lock.fl_flags = FL_POSIX;
d5b9026a 2854 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2855 file_lock.fl_start = locku->lu_offset;
2856
2857 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2858 file_lock.fl_end = ~(u64)0;
2859 else
2860 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2861 nfs4_transform_lock_offset(&file_lock);
2862
2863 /*
2864 * Try to unlock the file in the VFS.
2865 */
fd85b817 2866 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2867 if (err) {
fd85b817 2868 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2869 goto out_nfserr;
2870 }
2871 /*
2872 * OK, unlock succeeded; the only thing left to do is update the stateid.
2873 */
2874 update_stateid(&stp->st_stateid);
2875 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2876
2877out:
f2327d9a 2878 if (locku->lu_stateowner) {
1da177e4 2879 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2880 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2881 }
1da177e4
LT		 2882 nfs4_unlock_state();
2883 return status;
2884
2885out_nfserr:
b8dd7b9a 2886 status = nfserrno(err);
1da177e4
LT		 2887 goto out;
2888}
2889
2890/*
2891 * returns
2892 * 1: locks held by lockowner
2893 * 0: no locks held by lockowner
2894 */
2895static int
2896check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2897{
2898 struct file_lock **flpp;
7eaa36e2 2899 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2900 int status = 0;
2901
2902 lock_kernel();
2903 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2904 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2905 status = 1;
2906 goto out;
796dadfd 2907 }
1da177e4
LT		 2908 }
2909out:
2910 unlock_kernel();
2911 return status;
2912}
2913
b37ad28b 2914__be32
b591480b
BF		 2915nfsd4_release_lockowner(struct svc_rqst *rqstp,
2916 struct nfsd4_compound_state *cstate,
2917 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2918{
2919 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2920 struct nfs4_stateowner *sop;
2921 struct nfs4_stateid *stp;
1da177e4 2922 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2923 struct list_head matches;
2924 int i;
b37ad28b 2925 __be32 status;
1da177e4
LT		 2926
2927 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2928 clid->cl_boot, clid->cl_id);
2929
2930 /* XXX check for lease expiration */
2931
2932 status = nfserr_stale_clientid;
849823c5 2933 if (STALE_CLIENTID(clid))
1da177e4 2934 return status;
1da177e4
LT		 2935
2936 nfs4_lock_state();
2937
3e9e3dbe
N		 2938 status = nfserr_locks_held;
2939 /* XXX: we're doing a linear search through all the lockowners.
2940 * Yipes! For now we'll just hope clients aren't really using
2941 * release_lockowner much, but eventually we have to fix these
2942 * data structures. */
2943 INIT_LIST_HEAD(&matches);
2944 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2945 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 2946 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 2947 continue;
2948 list_for_each_entry(stp, &sop->so_stateids,
2949 st_perstateowner) {
2950 if (check_for_locks(stp->st_vfs_file, sop))
2951 goto out;
2952 /* Note: so_perclient unused for lockowners,
2953 * so it's OK to fool with here. */
2954 list_add(&sop->so_perclient, &matches);
2955 }
1da177e4 2956 }
3e9e3dbe
N		 2957 }
2958 /* Clients probably won't expect us to return with some (but not all)
2959 * of the lockowner state released; so don't release any until all
2960 * have been checked. */
2961 status = nfs_ok;
0fa822e4
N		 2962 while (!list_empty(&matches)) {
2963 sop = list_entry(matches.next, struct nfs4_stateowner,
2964 so_perclient);
2965 /* unhash_stateowner deletes so_perclient only
2966 * for openowners. */
2967 list_del(&sop->so_perclient);
3e9e3dbe 2968 release_stateowner(sop);
1da177e4
LT		 2969 }
2970out:
2971 nfs4_unlock_state();
2972 return status;
2973}
2974
2975static inline struct nfs4_client_reclaim *
a55370a3 2976alloc_reclaim(void)
1da177e4 2977{
a55370a3 2978 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 2979}
2980
c7b9a459
N		 2981int
2982nfs4_has_reclaimed_state(const char *name)
2983{
2984 unsigned int strhashval = clientstr_hashval(name);
2985 struct nfs4_client *clp;
2986
2987 clp = find_confirmed_client_by_str(name, strhashval);
2988 return clp ? 1 : 0;
2989}
2990
1da177e4
LT		 2991/*
2992 * failure => all reset bets are off, nfserr_no_grace...
2993 */
190e4fbf
N		 2994int
2995nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 2996{
2997 unsigned int strhashval;
2998 struct nfs4_client_reclaim *crp = NULL;
2999
a55370a3
N		 3000 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3001 crp = alloc_reclaim();
1da177e4
LT		 3002 if (!crp)
3003 return 0;
a55370a3 3004 strhashval = clientstr_hashval(name);
1da177e4
LT		 3005 INIT_LIST_HEAD(&crp->cr_strhash);
3006 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3007 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3008 reclaim_str_hashtbl_size++;
3009 return 1;
3010}
3011
3012static void
3013nfs4_release_reclaim(void)
3014{
3015 struct nfs4_client_reclaim *crp = NULL;
3016 int i;
3017
1da177e4
LT		 3018 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3019 while (!list_empty(&reclaim_str_hashtbl[i])) {
3020 crp = list_entry(reclaim_str_hashtbl[i].next,
3021 struct nfs4_client_reclaim, cr_strhash);
3022 list_del(&crp->cr_strhash);
1da177e4
LT		 3023 kfree(crp);
3024 reclaim_str_hashtbl_size--;
3025 }
3026 }
3027 BUG_ON(reclaim_str_hashtbl_size);
3028}
3029
3030/*
3031 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3032static struct nfs4_client_reclaim *
1da177e4
LT		 3033nfs4_find_reclaim_client(clientid_t *clid)
3034{
3035 unsigned int strhashval;
3036 struct nfs4_client *clp;
3037 struct nfs4_client_reclaim *crp = NULL;
3038
3039
3040 /* find clientid in conf_id_hashtbl */
3041 clp = find_confirmed_client(clid);
3042 if (clp == NULL)
3043 return NULL;
3044
a55370a3
N		 3045 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3046 clp->cl_name.len, clp->cl_name.data,
3047 clp->cl_recdir);
1da177e4
LT		 3048
3049 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3050 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3051 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3052 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3053 return crp;
3054 }
3055 }
3056 return NULL;
3057}
3058
3059/*
3060* Called from OPEN. Look for clientid in reclaim list.
3061*/
b37ad28b 3062__be32
1da177e4
LT		 3063nfs4_check_open_reclaim(clientid_t *clid)
3064{
dfc83565 3065 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3066}
3067
ac4d8ff2 3068/* initialization to perform at module load time: */
1da177e4 3069
e8ff2a84 3070int
ac4d8ff2 3071nfs4_state_init(void)
1da177e4 3072{
e8ff2a84 3073 int i, status;
1da177e4 3074
e8ff2a84
BF		 3075 status = nfsd4_init_slabs();
3076 if (status)
3077 return status;
1da177e4
LT		 3078 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3079 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3080 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3081 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3082 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3083 }
3084 for (i = 0; i < FILE_HASH_SIZE; i++) {
3085 INIT_LIST_HEAD(&file_hashtbl[i]);
3086 }
3087 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3088 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3089 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3090 }
3091 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3092 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3093 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3094 }
3095 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3096 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3097 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3098 }
1da177e4 3099 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3100 INIT_LIST_HEAD(&close_lru);
3101 INIT_LIST_HEAD(&client_lru);
3102 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3103 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3104 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3105 reclaim_str_hashtbl_size = 0;
e8ff2a84 3106 return 0;
ac4d8ff2
N		 3107}
3108
190e4fbf
N		 3109static void
3110nfsd4_load_reboot_recovery_data(void)
3111{
3112 int status;
3113
0964a3d3
N		 3114 nfs4_lock_state();
3115 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3116 status = nfsd4_recdir_load();
0964a3d3 3117 nfs4_unlock_state();
190e4fbf
N		 3118 if (status)
3119 printk("NFSD: Failure reading reboot recovery data\n");
3120}
3121
9a8db97e
ME		 3122unsigned long
3123get_nfs4_grace_period(void)
3124{
3125 return max(user_lease_time, lease_time) * HZ;
3126}
3127
c2f1a551
MS		 3128/*
3129 * Since the lifetime of a delegation isn't limited to that of an open, a
3130 * client may quite reasonably hang on to a delegation as long as it has
3131 * the inode cached. This becomes an obvious problem the first time a
3132 * client's inode cache approaches the size of the server's total memory.
3133 *
3134 * For now we avoid this problem by imposing a hard limit on the number
3135 * of delegations, which varies according to the server's memory size.
3136 */
3137static void
3138set_max_delegations(void)
3139{
3140 /*
3141 * Allow at most 4 delegations per megabyte of RAM. Quick
3142 * estimates suggest that in the worst case (where every delegation
3143 * is for a different inode), a delegation could take about 1.5K,
3144 * giving a worst case usage of about 6% of memory.
3145 */
3146 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3147}
3148
ac4d8ff2
N		 3149/* initialization to perform when the nfsd service is started: */
3150
3151static void
3152__nfs4_state_start(void)
3153{
9a8db97e 3154 unsigned long grace_time;
ac4d8ff2 3155
1da177e4 3156 boot_time = get_seconds();
9a8db97e 3157 grace_time = get_nfs_grace_period();
d99a05ad 3158 lease_time = user_lease_time;
a76b4319 3159 in_grace = 1;
9a8db97e
ME		 3160 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3161 grace_time/HZ);
58da282b 3162 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3163 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3164 set_max_delegations();
1da177e4
LT		 3165}
3166
e8ff2a84 3167void
76a3550e 3168nfs4_state_start(void)
1da177e4 3169{
1da177e4 3170 if (nfs4_init)
e8ff2a84 3171 return;
190e4fbf 3172 nfsd4_load_reboot_recovery_data();
76a3550e 3173 __nfs4_state_start();
1da177e4 3174 nfs4_init = 1;
e8ff2a84 3175 return;
1da177e4
LT		 3176}
3177
3178int
3179nfs4_in_grace(void)
3180{
a76b4319 3181 return in_grace;
1da177e4
LT		 3182}
3183
3184time_t
3185nfs4_lease_time(void)
3186{
3187 return lease_time;
3188}
3189
3190static void
3191__nfs4_state_shutdown(void)
3192{
3193 int i;
3194 struct nfs4_client *clp = NULL;
3195 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3196 struct list_head *pos, *next, reaplist;
3197
1da177e4
LT		 3198 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3199 while (!list_empty(&conf_id_hashtbl[i])) {
3200 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3201 expire_client(clp);
3202 }
3203 while (!list_empty(&unconf_str_hashtbl[i])) {
3204 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3205 expire_client(clp);
3206 }
3207 }
3208 INIT_LIST_HEAD(&reaplist);
3209 spin_lock(&recall_lock);
3210 list_for_each_safe(pos, next, &del_recall_lru) {
3211 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3212 list_move(&dp->dl_recall_lru, &reaplist);
3213 }
3214 spin_unlock(&recall_lock);
3215 list_for_each_safe(pos, next, &reaplist) {
3216 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3217 list_del_init(&dp->dl_recall_lru);
3218 unhash_delegation(dp);
3219 }
3220
190e4fbf 3221 nfsd4_shutdown_recdir();
1da177e4 3222 nfs4_init = 0;
1da177e4
LT		 3223}
3224
3225void
3226nfs4_state_shutdown(void)
3227{
5e8d5c29
N		 3228 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3229 destroy_workqueue(laundry_wq);
1da177e4
LT		 3230 nfs4_lock_state();
3231 nfs4_release_reclaim();
3232 __nfs4_state_shutdown();
1da177e4
LT		 3233 nfs4_unlock_state();
3234}
3235
0964a3d3
N		 3236static void
3237nfs4_set_recdir(char *recdir)
3238{
3239 nfs4_lock_state();
3240 strcpy(user_recovery_dirname, recdir);
3241 nfs4_unlock_state();
3242}
3243
3244/*
3245 * Change the NFSv4 recovery directory to recdir.
3246 */
3247int
3248nfs4_reset_recoverydir(char *recdir)
3249{
3250 int status;
3251 struct nameidata nd;
3252
3253 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3254 if (status)
3255 return status;
3256 status = -ENOTDIR;
3257 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3258 nfs4_set_recdir(recdir);
3259 status = 0;
3260 }
3261 path_release(&nd);
3262 return status;
3263}
3264
1da177e4
LT		 3265/*
3266 * Called when leasetime is changed.
3267 *
d99a05ad
N		 3268 * The only way the protocol gives us to handle on-the-fly lease changes is to
3269 * simulate a reboot. Instead of doing that, we just wait till the next time
3270 * we start to register any changes in lease time. If the administrator
3271 * really wants to change the lease time *now*, they can go ahead and bring
3272 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3273 */
3274void
3275nfs4_reset_lease(time_t leasetime)
3276{
d99a05ad
N		 3277 lock_kernel();
3278 user_lease_time = leasetime;
3279 unlock_kernel();
1da177e4 3280}
Linux 6.x block layer and io_uring tree(s)