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rpc: allow gss callbacks to client
[net-next-2.6.git] / fs / nfsd / nfs4state.c
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1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
78static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 79static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 81
82/* Locking:
83 *
353ab6e9 84 * client_mutex:
1da177e4
LT		 85 * protects clientid_hashtbl[], clientstr_hashtbl[],
86 * unconfstr_hashtbl[], uncofid_hashtbl[].
87 */
353ab6e9 88static DEFINE_MUTEX(client_mutex);
1da177e4 89
e18b890b
CL		 90static struct kmem_cache *stateowner_slab = NULL;
91static struct kmem_cache *file_slab = NULL;
92static struct kmem_cache *stateid_slab = NULL;
93static struct kmem_cache *deleg_slab = NULL;
e60d4398 94
1da177e4
LT		 95void
96nfs4_lock_state(void)
97{
353ab6e9 98 mutex_lock(&client_mutex);
1da177e4
LT		 99}
100
101void
102nfs4_unlock_state(void)
103{
353ab6e9 104 mutex_unlock(&client_mutex);
1da177e4
LT		 105}
106
107static inline u32
108opaque_hashval(const void *ptr, int nbytes)
109{
110 unsigned char *cptr = (unsigned char *) ptr;
111
112 u32 x = 0;
113 while (nbytes--) {
114 x *= 37;
115 x += *cptr++;
116 }
117 return x;
118}
119
120/* forward declarations */
121static void release_stateowner(struct nfs4_stateowner *sop);
122static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 123
124/*
125 * Delegation state
126 */
127
128/* recall_lock protects the del_recall_lru */
34af946a 129static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 130static struct list_head del_recall_lru;
131
13cd2184
N		 132static void
133free_nfs4_file(struct kref *kref)
134{
135 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
136 list_del(&fp->fi_hash);
137 iput(fp->fi_inode);
138 kmem_cache_free(file_slab, fp);
139}
140
141static inline void
142put_nfs4_file(struct nfs4_file *fi)
143{
144 kref_put(&fi->fi_ref, free_nfs4_file);
145}
146
147static inline void
148get_nfs4_file(struct nfs4_file *fi)
149{
150 kref_get(&fi->fi_ref);
151}
152
ef0f3390 153static int num_delegations;
c2f1a551 154unsigned int max_delegations;
ef0f3390
N		 155
156/*
157 * Open owner state (share locks)
158 */
159
160/* hash tables for nfs4_stateowner */
161#define OWNER_HASH_BITS 8
162#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
163#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
164
165#define ownerid_hashval(id) \
166 ((id) & OWNER_HASH_MASK)
167#define ownerstr_hashval(clientid, ownername) \
168 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
169
170static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
171static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
172
173/* hash table for nfs4_file */
174#define FILE_HASH_BITS 8
175#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
176#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
177/* hash table for (open)nfs4_stateid */
178#define STATEID_HASH_BITS 10
179#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
180#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
181
182#define file_hashval(x) \
183 hash_ptr(x, FILE_HASH_BITS)
184#define stateid_hashval(owner_id, file_id) \
185 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
186
187static struct list_head file_hashtbl[FILE_HASH_SIZE];
188static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
189
1da177e4
LT		 190static struct nfs4_delegation *
191alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
192{
193 struct nfs4_delegation *dp;
194 struct nfs4_file *fp = stp->st_file;
195 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
196
197 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 198 if (fp->fi_had_conflict)
199 return NULL;
c2f1a551 200 if (num_delegations > max_delegations)
ef0f3390 201 return NULL;
5b2d21c1
N		 202 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
203 if (dp == NULL)
1da177e4 204 return dp;
ef0f3390 205 num_delegations++;
ea1da636
N		 206 INIT_LIST_HEAD(&dp->dl_perfile);
207 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 208 INIT_LIST_HEAD(&dp->dl_recall_lru);
209 dp->dl_client = clp;
13cd2184 210 get_nfs4_file(fp);
1da177e4
LT		 211 dp->dl_file = fp;
212 dp->dl_flock = NULL;
213 get_file(stp->st_vfs_file);
214 dp->dl_vfs_file = stp->st_vfs_file;
215 dp->dl_type = type;
216 dp->dl_recall.cbr_dp = NULL;
217 dp->dl_recall.cbr_ident = cb->cb_ident;
218 dp->dl_recall.cbr_trunc = 0;
219 dp->dl_stateid.si_boot = boot_time;
220 dp->dl_stateid.si_stateownerid = current_delegid++;
221 dp->dl_stateid.si_fileid = 0;
222 dp->dl_stateid.si_generation = 0;
223 dp->dl_fhlen = current_fh->fh_handle.fh_size;
224 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
225 current_fh->fh_handle.fh_size);
226 dp->dl_time = 0;
227 atomic_set(&dp->dl_count, 1);
ea1da636
N		 228 list_add(&dp->dl_perfile, &fp->fi_delegations);
229 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 230 return dp;
231}
232
233void
234nfs4_put_delegation(struct nfs4_delegation *dp)
235{
236 if (atomic_dec_and_test(&dp->dl_count)) {
237 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 238 put_nfs4_file(dp->dl_file);
5b2d21c1 239 kmem_cache_free(deleg_slab, dp);
ef0f3390 240 num_delegations--;
1da177e4
LT		 241 }
242}
243
244/* Remove the associated file_lock first, then remove the delegation.
245 * lease_modify() is called to remove the FS_LEASE file_lock from
246 * the i_flock list, eventually calling nfsd's lock_manager
247 * fl_release_callback.
248 */
249static void
250nfs4_close_delegation(struct nfs4_delegation *dp)
251{
252 struct file *filp = dp->dl_vfs_file;
253
254 dprintk("NFSD: close_delegation dp %p\n",dp);
255 dp->dl_vfs_file = NULL;
256 /* The following nfsd_close may not actually close the file,
257 * but we want to remove the lease in any case. */
c907132d 258 if (dp->dl_flock)
a9933cea 259 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 260 nfsd_close(filp);
1da177e4
LT		 261}
262
263/* Called under the state lock. */
264static void
265unhash_delegation(struct nfs4_delegation *dp)
266{
ea1da636
N		 267 list_del_init(&dp->dl_perfile);
268 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 269 spin_lock(&recall_lock);
270 list_del_init(&dp->dl_recall_lru);
271 spin_unlock(&recall_lock);
272 nfs4_close_delegation(dp);
273 nfs4_put_delegation(dp);
274}
275
276/*
277 * SETCLIENTID state
278 */
279
280/* Hash tables for nfs4_clientid state */
281#define CLIENT_HASH_BITS 4
282#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
283#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
284
285#define clientid_hashval(id) \
286 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 287#define clientstr_hashval(name) \
288 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 289/*
290 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
291 * used in reboot/reset lease grace period processing
292 *
293 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
294 * setclientid_confirmed info.
295 *
296 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
297 * setclientid info.
298 *
299 * client_lru holds client queue ordered by nfs4_client.cl_time
300 * for lease renewal.
301 *
302 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
303 * for last close replay.
304 */
305static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
306static int reclaim_str_hashtbl_size = 0;
307static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
311static struct list_head client_lru;
312static struct list_head close_lru;
313
314static inline void
315renew_client(struct nfs4_client *clp)
316{
317 /*
318 * Move client to the end to the LRU list.
319 */
320 dprintk("renewing client (clientid %08x/%08x)\n",
321 clp->cl_clientid.cl_boot,
322 clp->cl_clientid.cl_id);
323 list_move_tail(&clp->cl_lru, &client_lru);
324 clp->cl_time = get_seconds();
325}
326
327/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
328static int
329STALE_CLIENTID(clientid_t *clid)
330{
331 if (clid->cl_boot == boot_time)
332 return 0;
333 dprintk("NFSD stale clientid (%08x/%08x)\n",
334 clid->cl_boot, clid->cl_id);
335 return 1;
336}
337
338/*
339 * XXX Should we use a slab cache ?
340 * This type of memory management is somewhat inefficient, but we use it
341 * anyway since SETCLIENTID is not a common operation.
342 */
35bba9a3 343static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 344{
345 struct nfs4_client *clp;
346
35bba9a3
BF		 347 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
348 if (clp == NULL)
349 return NULL;
350 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
351 if (clp->cl_name.data == NULL) {
352 kfree(clp);
353 return NULL;
1da177e4 354 }
35bba9a3
BF		 355 memcpy(clp->cl_name.data, name.data, name.len);
356 clp->cl_name.len = name.len;
1da177e4
LT		 357 return clp;
358}
359
1b1a9b31
BF		 360static void
361shutdown_callback_client(struct nfs4_client *clp)
362{
363 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
364
1b1a9b31 365 if (clnt) {
404ec117
BF		 366 /*
367 * Callback threads take a reference on the client, so there
368 * should be no outstanding callbacks at this point.
369 */
1b1a9b31
BF		 370 clp->cl_callback.cb_client = NULL;
371 rpc_shutdown_client(clnt);
372 }
373}
374
1da177e4
LT		 375static inline void
376free_client(struct nfs4_client *clp)
377{
1b1a9b31 378 shutdown_callback_client(clp);
1da177e4
LT		 379 if (clp->cl_cred.cr_group_info)
380 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 381 kfree(clp->cl_principal);
1da177e4
LT		 382 kfree(clp->cl_name.data);
383 kfree(clp);
384}
385
386void
387put_nfs4_client(struct nfs4_client *clp)
388{
389 if (atomic_dec_and_test(&clp->cl_count))
390 free_client(clp);
391}
392
393static void
394expire_client(struct nfs4_client *clp)
395{
396 struct nfs4_stateowner *sop;
397 struct nfs4_delegation *dp;
1da177e4
LT		 398 struct list_head reaplist;
399
400 dprintk("NFSD: expire_client cl_count %d\n",
401 atomic_read(&clp->cl_count));
402
1da177e4
LT		 403 INIT_LIST_HEAD(&reaplist);
404 spin_lock(&recall_lock);
ea1da636
N		 405 while (!list_empty(&clp->cl_delegations)) {
406 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 407 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
408 dp->dl_flock);
ea1da636 409 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 410 list_move(&dp->dl_recall_lru, &reaplist);
411 }
412 spin_unlock(&recall_lock);
413 while (!list_empty(&reaplist)) {
414 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
415 list_del_init(&dp->dl_recall_lru);
416 unhash_delegation(dp);
417 }
418 list_del(&clp->cl_idhash);
419 list_del(&clp->cl_strhash);
420 list_del(&clp->cl_lru);
ea1da636
N		 421 while (!list_empty(&clp->cl_openowners)) {
422 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 423 release_stateowner(sop);
424 }
425 put_nfs4_client(clp);
426}
427
35bba9a3
BF		 428static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
429{
1da177e4
LT		 430 struct nfs4_client *clp;
431
35bba9a3
BF		 432 clp = alloc_client(name);
433 if (clp == NULL)
434 return NULL;
a55370a3 435 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 436 atomic_set(&clp->cl_count, 1);
437 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 438 INIT_LIST_HEAD(&clp->cl_idhash);
439 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 440 INIT_LIST_HEAD(&clp->cl_openowners);
441 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 442 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 443 return clp;
444}
445
35bba9a3
BF		 446static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
447{
448 memcpy(target->cl_verifier.data, source->data,
449 sizeof(target->cl_verifier.data));
1da177e4
LT		 450}
451
35bba9a3
BF		 452static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
453{
1da177e4
LT		 454 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
455 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
456}
457
35bba9a3
BF		 458static void copy_cred(struct svc_cred *target, struct svc_cred *source)
459{
1da177e4
LT		 460 target->cr_uid = source->cr_uid;
461 target->cr_gid = source->cr_gid;
462 target->cr_group_info = source->cr_group_info;
463 get_group_info(target->cr_group_info);
464}
465
35bba9a3 466static int same_name(const char *n1, const char *n2)
599e0a22 467{
a55370a3 468 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 469}
470
471static int
599e0a22
BF		 472same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
473{
474 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 475}
476
477static int
599e0a22
BF		 478same_clid(clientid_t *cl1, clientid_t *cl2)
479{
480 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 481}
482
483/* XXX what about NGROUP */
484static int
599e0a22
BF		 485same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
486{
487 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 488}
489
5ec7b46c
BF		 490static void gen_clid(struct nfs4_client *clp)
491{
492 static u32 current_clientid = 1;
493
1da177e4
LT		 494 clp->cl_clientid.cl_boot = boot_time;
495 clp->cl_clientid.cl_id = current_clientid++;
496}
497
deda2faa
BF		 498static void gen_confirm(struct nfs4_client *clp)
499{
500 static u32 i;
501 u32 *p;
1da177e4 502
1da177e4 503 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 504 *p++ = get_seconds();
505 *p++ = i++;
1da177e4
LT		 506}
507
35bba9a3
BF		 508static int check_name(struct xdr_netobj name)
509{
1da177e4
LT		 510 if (name.len == 0)
511 return 0;
512 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 513 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 514 return 0;
515 }
516 return 1;
517}
518
fd39ca9a 519static void
1da177e4
LT		 520add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
521{
522 unsigned int idhashval;
523
524 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
525 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
526 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
527 list_add_tail(&clp->cl_lru, &client_lru);
528 clp->cl_time = get_seconds();
529}
530
fd39ca9a 531static void
1da177e4
LT		 532move_to_confirmed(struct nfs4_client *clp)
533{
534 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
535 unsigned int strhashval;
536
537 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
538 list_del_init(&clp->cl_strhash);
f116629d 539 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 540 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 541 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
542 renew_client(clp);
543}
544
545static struct nfs4_client *
546find_confirmed_client(clientid_t *clid)
547{
548 struct nfs4_client *clp;
549 unsigned int idhashval = clientid_hashval(clid->cl_id);
550
551 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 552 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 553 return clp;
554 }
555 return NULL;
556}
557
558static struct nfs4_client *
559find_unconfirmed_client(clientid_t *clid)
560{
561 struct nfs4_client *clp;
562 unsigned int idhashval = clientid_hashval(clid->cl_id);
563
564 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 565 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 566 return clp;
567 }
568 return NULL;
569}
570
28ce6054
N		 571static struct nfs4_client *
572find_confirmed_client_by_str(const char *dname, unsigned int hashval)
573{
574 struct nfs4_client *clp;
575
576 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
577 if (same_name(clp->cl_recdir, dname))
578 return clp;
579 }
580 return NULL;
581}
582
583static struct nfs4_client *
584find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
585{
586 struct nfs4_client *clp;
587
588 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
589 if (same_name(clp->cl_recdir, dname))
590 return clp;
591 }
592 return NULL;
593}
594
1da177e4
LT		 595/* a helper function for parse_callback */
596static int
597parse_octet(unsigned int *lenp, char **addrp)
598{
599 unsigned int len = *lenp;
600 char *p = *addrp;
601 int n = -1;
602 char c;
603
604 for (;;) {
605 if (!len)
606 break;
607 len--;
608 c = *p++;
609 if (c == '.')
610 break;
611 if ((c < '0') || (c > '9')) {
612 n = -1;
613 break;
614 }
615 if (n < 0)
616 n = 0;
617 n = (n * 10) + (c - '0');
618 if (n > 255) {
619 n = -1;
620 break;
621 }
622 }
623 *lenp = len;
624 *addrp = p;
625 return n;
626}
627
628/* parse and set the setclientid ipv4 callback address */
fd39ca9a 629static int
1da177e4
LT		 630parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
631{
632 int temp = 0;
633 u32 cbaddr = 0;
634 u16 cbport = 0;
635 u32 addrlen = addr_len;
636 char *addr = addr_val;
637 int i, shift;
638
639 /* ipaddress */
640 shift = 24;
641 for(i = 4; i > 0 ; i--) {
642 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
643 return 0;
644 }
645 cbaddr |= (temp << shift);
646 if (shift > 0)
647 shift -= 8;
648 }
649 *cbaddrp = cbaddr;
650
651 /* port */
652 shift = 8;
653 for(i = 2; i > 0 ; i--) {
654 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
655 return 0;
656 }
657 cbport |= (temp << shift);
658 if (shift > 0)
659 shift -= 8;
660 }
661 *cbportp = cbport;
662 return 1;
663}
664
fd39ca9a 665static void
1da177e4
LT		 666gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
667{
668 struct nfs4_callback *cb = &clp->cl_callback;
669
670 /* Currently, we only support tcp for the callback channel */
671 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
672 goto out_err;
673
674 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
675 &cb->cb_addr, &cb->cb_port)))
676 goto out_err;
677 cb->cb_prog = se->se_callback_prog;
678 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 679 return;
680out_err:
849823c5 681 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 682 "will not receive delegations\n",
683 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
684
1da177e4
LT		 685 return;
686}
687
b37ad28b 688__be32
b591480b
BF		 689nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
690 struct nfsd4_setclientid *setclid)
1da177e4 691{
27459f09 692 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 693 struct xdr_netobj clname = {
694 .len = setclid->se_namelen,
695 .data = setclid->se_name,
696 };
697 nfs4_verifier clverifier = setclid->se_verf;
698 unsigned int strhashval;
28ce6054 699 struct nfs4_client *conf, *unconf, *new;
b37ad28b 700 __be32 status;
68e76ad0 701 char *princ;
a55370a3 702 char dname[HEXDIR_LEN];
1da177e4 703
1da177e4 704 if (!check_name(clname))
73aea4ec 705 return nfserr_inval;
1da177e4 706
a55370a3
N		 707 status = nfs4_make_rec_clidname(dname, &clname);
708 if (status)
73aea4ec 709 return status;
a55370a3 710
1da177e4
LT		 711 /*
712 * XXX The Duplicate Request Cache (DRC) has been checked (??)
713 * We get here on a DRC miss.
714 */
715
a55370a3 716 strhashval = clientstr_hashval(dname);
1da177e4 717
1da177e4 718 nfs4_lock_state();
28ce6054
N		 719 conf = find_confirmed_client_by_str(dname, strhashval);
720 if (conf) {
a186e767 721 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 722 status = nfserr_clid_inuse;
599e0a22 723 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 724 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 725 dprintk("NFSD: setclientid: string in use by client"
726 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 727 goto out;
728 }
1da177e4 729 }
a186e767
BF		 730 /*
731 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
732 * has a description of SETCLIENTID request processing consisting
733 * of 5 bullet points, labeled as CASE0 - CASE4 below.
734 */
28ce6054 735 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 736 status = nfserr_resource;
737 if (!conf) {
a186e767
BF		 738 /*
739 * RFC 3530 14.2.33 CASE 4:
740 * placed first, because it is the normal case
1da177e4
LT		 741 */
742 if (unconf)
743 expire_client(unconf);
a55370a3
N		 744 new = create_client(clname, dname);
745 if (new == NULL)
1da177e4 746 goto out;
1da177e4 747 gen_clid(new);
599e0a22 748 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 749 /*
a186e767
BF		 750 * RFC 3530 14.2.33 CASE 1:
751 * probable callback update
1da177e4 752 */
31f4a6c1
N		 753 if (unconf) {
754 /* Note this is removing unconfirmed {*x***},
755 * which is stronger than RFC recommended {vxc**}.
756 * This has the advantage that there is at most
757 * one {*x***} in either list at any time.
758 */
759 expire_client(unconf);
1da177e4 760 }
a55370a3
N		 761 new = create_client(clname, dname);
762 if (new == NULL)
1da177e4 763 goto out;
1da177e4 764 copy_clid(new, conf);
1da177e4
LT		 765 } else if (!unconf) {
766 /*
a186e767
BF		 767 * RFC 3530 14.2.33 CASE 2:
768 * probable client reboot; state will be removed if
769 * confirmed.
1da177e4 770 */
a55370a3
N		 771 new = create_client(clname, dname);
772 if (new == NULL)
1da177e4 773 goto out;
1da177e4 774 gen_clid(new);
49ba8781 775 } else {
a186e767
BF		 776 /*
777 * RFC 3530 14.2.33 CASE 3:
778 * probable client reboot; state will be removed if
779 * confirmed.
1da177e4
LT		 780 */
781 expire_client(unconf);
a55370a3
N		 782 new = create_client(clname, dname);
783 if (new == NULL)
1da177e4 784 goto out;
1da177e4 785 gen_clid(new);
1da177e4 786 }
c175b83c
BF		 787 copy_verf(new, &clverifier);
788 new->cl_addr = sin->sin_addr.s_addr;
68e76ad0
OK		 789 princ = svc_gss_principal(rqstp);
790 if (princ) {
791 new->cl_principal = kstrdup(princ, GFP_KERNEL);
792 if (new->cl_principal == NULL) {
793 free_client(new);
794 goto out;
795 }
796 }
c175b83c
BF		 797 copy_cred(&new->cl_cred, &rqstp->rq_cred);
798 gen_confirm(new);
799 gen_callback(new, setclid);
800 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 801 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
802 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
803 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
804 status = nfs_ok;
805out:
806 nfs4_unlock_state();
807 return status;
808}
809
810
811/*
a186e767
BF		 812 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
813 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
814 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 815 */
b37ad28b 816__be32
b591480b
BF		 817nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
818 struct nfsd4_compound_state *cstate,
819 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 820{
27459f09 821 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 822 struct nfs4_client *conf, *unconf;
1da177e4
LT		 823 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
824 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 825 __be32 status;
1da177e4
LT		 826
827 if (STALE_CLIENTID(clid))
828 return nfserr_stale_clientid;
829 /*
830 * XXX The Duplicate Request Cache (DRC) has been checked (??)
831 * We get here on a DRC miss.
832 */
833
834 nfs4_lock_state();
21ab45a4
N		 835
836 conf = find_confirmed_client(clid);
837 unconf = find_unconfirmed_client(clid);
838
839 status = nfserr_clid_inuse;
27459f09 840 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 841 goto out;
27459f09 842 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 843 goto out;
844
a186e767
BF		 845 /*
846 * section 14.2.34 of RFC 3530 has a description of
847 * SETCLIENTID_CONFIRM request processing consisting
848 * of 4 bullet points, labeled as CASE1 - CASE4 below.
849 */
366e0c1d 850 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 851 /*
852 * RFC 3530 14.2.34 CASE 1:
853 * callback update
854 */
599e0a22 855 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 856 status = nfserr_clid_inuse;
857 else {
1a69c179
N		 858 /* XXX: We just turn off callbacks until we can handle
859 * change request correctly. */
cb36d634 860 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 861 gen_confirm(conf);
46309029 862 nfsd4_remove_clid_dir(unconf);
1a69c179 863 expire_client(unconf);
1da177e4 864 status = nfs_ok;
1a69c179 865
1da177e4 866 }
f3aba4e5 867 } else if (conf && !unconf) {
a186e767
BF		 868 /*
869 * RFC 3530 14.2.34 CASE 2:
870 * probable retransmitted request; play it safe and
871 * do nothing.
7c79f737 872 */
599e0a22 873 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 874 status = nfserr_clid_inuse;
21ab45a4 875 else
1da177e4 876 status = nfs_ok;
7c79f737 877 } else if (!conf && unconf
599e0a22 878 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 879 /*
880 * RFC 3530 14.2.34 CASE 3:
881 * Normal case; new or rebooted client:
7c79f737 882 */
599e0a22 883 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 884 status = nfserr_clid_inuse;
885 } else {
1a69c179
N		 886 unsigned int hash =
887 clientstr_hashval(unconf->cl_recdir);
888 conf = find_confirmed_client_by_str(unconf->cl_recdir,
889 hash);
890 if (conf) {
c7b9a459 891 nfsd4_remove_clid_dir(conf);
1a69c179
N		 892 expire_client(conf);
893 }
1da177e4 894 move_to_confirmed(unconf);
21ab45a4 895 conf = unconf;
46f8a64b 896 nfsd4_probe_callback(conf);
1a69c179 897 status = nfs_ok;
1da177e4 898 }
599e0a22
BF		 899 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
900 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 901 &confirm)))) {
a186e767
BF		 902 /*
903 * RFC 3530 14.2.34 CASE 4:
904 * Client probably hasn't noticed that we rebooted yet.
7c79f737 905 */
1da177e4 906 status = nfserr_stale_clientid;
7c79f737 907 } else {
08e8987c
N		 908 /* check that we have hit one of the cases...*/
909 status = nfserr_clid_inuse;
910 }
1da177e4 911out:
1da177e4
LT		 912 nfs4_unlock_state();
913 return status;
914}
915
1da177e4
LT		 916/* OPEN Share state helper functions */
917static inline struct nfs4_file *
918alloc_init_file(struct inode *ino)
919{
920 struct nfs4_file *fp;
921 unsigned int hashval = file_hashval(ino);
922
e60d4398
N		 923 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
924 if (fp) {
13cd2184 925 kref_init(&fp->fi_ref);
1da177e4 926 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 927 INIT_LIST_HEAD(&fp->fi_stateids);
928 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 929 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
930 fp->fi_inode = igrab(ino);
931 fp->fi_id = current_fileid++;
47f9940c 932 fp->fi_had_conflict = false;
1da177e4
LT		 933 return fp;
934 }
935 return NULL;
936}
937
e60d4398 938static void
e18b890b 939nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 940{
e60d4398
N		 941 if (*slab == NULL)
942 return;
1a1d92c1 943 kmem_cache_destroy(*slab);
e60d4398 944 *slab = NULL;
1da177e4
LT		 945}
946
e8ff2a84 947void
1da177e4
LT		 948nfsd4_free_slabs(void)
949{
e60d4398
N		 950 nfsd4_free_slab(&stateowner_slab);
951 nfsd4_free_slab(&file_slab);
5ac049ac 952 nfsd4_free_slab(&stateid_slab);
5b2d21c1 953 nfsd4_free_slab(&deleg_slab);
e60d4398 954}
1da177e4 955
e60d4398
N		 956static int
957nfsd4_init_slabs(void)
958{
959 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 960 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 961 if (stateowner_slab == NULL)
962 goto out_nomem;
963 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 964 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 965 if (file_slab == NULL)
966 goto out_nomem;
5ac049ac 967 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 968 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 969 if (stateid_slab == NULL)
970 goto out_nomem;
5b2d21c1 971 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 972 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 973 if (deleg_slab == NULL)
974 goto out_nomem;
e60d4398
N		 975 return 0;
976out_nomem:
977 nfsd4_free_slabs();
978 dprintk("nfsd4: out of memory while initializing nfsv4\n");
979 return -ENOMEM;
1da177e4
LT		 980}
981
982void
983nfs4_free_stateowner(struct kref *kref)
984{
985 struct nfs4_stateowner *sop =
986 container_of(kref, struct nfs4_stateowner, so_ref);
987 kfree(sop->so_owner.data);
988 kmem_cache_free(stateowner_slab, sop);
989}
990
991static inline struct nfs4_stateowner *
992alloc_stateowner(struct xdr_netobj *owner)
993{
994 struct nfs4_stateowner *sop;
995
996 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
997 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
998 memcpy(sop->so_owner.data, owner->data, owner->len);
999 sop->so_owner.len = owner->len;
1000 kref_init(&sop->so_ref);
1001 return sop;
1002 }
1003 kmem_cache_free(stateowner_slab, sop);
1004 }
1005 return NULL;
1006}
1007
1008static struct nfs4_stateowner *
1009alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1010 struct nfs4_stateowner *sop;
1011 struct nfs4_replay *rp;
1012 unsigned int idhashval;
1013
1014 if (!(sop = alloc_stateowner(&open->op_owner)))
1015 return NULL;
1016 idhashval = ownerid_hashval(current_ownerid);
1017 INIT_LIST_HEAD(&sop->so_idhash);
1018 INIT_LIST_HEAD(&sop->so_strhash);
1019 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1020 INIT_LIST_HEAD(&sop->so_stateids);
1021 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1022 INIT_LIST_HEAD(&sop->so_close_lru);
1023 sop->so_time = 0;
1024 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1025 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1026 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1027 sop->so_is_open_owner = 1;
1028 sop->so_id = current_ownerid++;
1029 sop->so_client = clp;
1030 sop->so_seqid = open->op_seqid;
1031 sop->so_confirmed = 0;
1032 rp = &sop->so_replay;
de1ae286 1033 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1034 rp->rp_buflen = 0;
1035 rp->rp_buf = rp->rp_ibuf;
1036 return sop;
1037}
1038
1039static void
1040release_stateid_lockowners(struct nfs4_stateid *open_stp)
1041{
1042 struct nfs4_stateowner *lock_sop;
1043
ea1da636
N		 1044 while (!list_empty(&open_stp->st_lockowners)) {
1045 lock_sop = list_entry(open_stp->st_lockowners.next,
1046 struct nfs4_stateowner, so_perstateid);
1047 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1048 BUG_ON(lock_sop->so_is_open_owner);
1049 release_stateowner(lock_sop);
1050 }
1051}
1052
1053static void
1054unhash_stateowner(struct nfs4_stateowner *sop)
1055{
1056 struct nfs4_stateid *stp;
1057
1058 list_del(&sop->so_idhash);
1059 list_del(&sop->so_strhash);
6fa305de 1060 if (sop->so_is_open_owner)
1da177e4 1061 list_del(&sop->so_perclient);
ea1da636
N		 1062 list_del(&sop->so_perstateid);
1063 while (!list_empty(&sop->so_stateids)) {
1064 stp = list_entry(sop->so_stateids.next,
1065 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1066 if (sop->so_is_open_owner)
1067 release_stateid(stp, OPEN_STATE);
1068 else
1069 release_stateid(stp, LOCK_STATE);
1070 }
1071}
1072
1073static void
1074release_stateowner(struct nfs4_stateowner *sop)
1075{
1076 unhash_stateowner(sop);
1077 list_del(&sop->so_close_lru);
1078 nfs4_put_stateowner(sop);
1079}
1080
1081static inline void
1082init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1083 struct nfs4_stateowner *sop = open->op_stateowner;
1084 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1085
1086 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1087 INIT_LIST_HEAD(&stp->st_perstateowner);
1088 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1089 INIT_LIST_HEAD(&stp->st_perfile);
1090 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1091 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1092 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1093 stp->st_stateowner = sop;
13cd2184 1094 get_nfs4_file(fp);
1da177e4
LT		 1095 stp->st_file = fp;
1096 stp->st_stateid.si_boot = boot_time;
1097 stp->st_stateid.si_stateownerid = sop->so_id;
1098 stp->st_stateid.si_fileid = fp->fi_id;
1099 stp->st_stateid.si_generation = 0;
1100 stp->st_access_bmap = 0;
1101 stp->st_deny_bmap = 0;
1102 __set_bit(open->op_share_access, &stp->st_access_bmap);
1103 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1104 stp->st_openstp = NULL;
1da177e4
LT		 1105}
1106
1107static void
1108release_stateid(struct nfs4_stateid *stp, int flags)
1109{
1110 struct file *filp = stp->st_vfs_file;
1111
1112 list_del(&stp->st_hash);
1da177e4 1113 list_del(&stp->st_perfile);
ea1da636 1114 list_del(&stp->st_perstateowner);
1da177e4
LT		 1115 if (flags & OPEN_STATE) {
1116 release_stateid_lockowners(stp);
1117 stp->st_vfs_file = NULL;
1118 nfsd_close(filp);
1da177e4
LT		 1119 } else if (flags & LOCK_STATE)
1120 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1121 put_nfs4_file(stp->st_file);
5ac049ac 1122 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1123}
1124
fd39ca9a 1125static void
1da177e4
LT		 1126move_to_close_lru(struct nfs4_stateowner *sop)
1127{
1128 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1129
358dd55a 1130 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1131 sop->so_time = get_seconds();
1132}
1133
1da177e4 1134static int
599e0a22
BF		 1135same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1136 clientid_t *clid)
1137{
1138 return (sop->so_owner.len == owner->len) &&
1139 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1140 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1141}
1142
1143static struct nfs4_stateowner *
1144find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1145{
1146 struct nfs4_stateowner *so = NULL;
1147
1148 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1149 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1150 return so;
1151 }
1152 return NULL;
1153}
1154
1155/* search file_hashtbl[] for file */
1156static struct nfs4_file *
1157find_file(struct inode *ino)
1158{
1159 unsigned int hashval = file_hashval(ino);
1160 struct nfs4_file *fp;
1161
1162 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1163 if (fp->fi_inode == ino) {
1164 get_nfs4_file(fp);
1da177e4 1165 return fp;
13cd2184 1166 }
1da177e4
LT		 1167 }
1168 return NULL;
1169}
1170
8838dc43 1171static inline int access_valid(u32 x)
ba5a6a19 1172{
8838dc43
BF		 1173 if (x < NFS4_SHARE_ACCESS_READ)
1174 return 0;
1175 if (x > NFS4_SHARE_ACCESS_BOTH)
1176 return 0;
1177 return 1;
ba5a6a19
BF		 1178}
1179
8838dc43 1180static inline int deny_valid(u32 x)
ba5a6a19 1181{
8838dc43
BF		 1182 /* Note: unlike access bits, deny bits may be zero. */
1183 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1184}
1da177e4 1185
4f83aa30
BF		 1186/*
1187 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1188 * st_{access,deny}_bmap field of the stateid, in order to track not
1189 * only what share bits are currently in force, but also what
1190 * combinations of share bits previous opens have used. This allows us
1191 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1192 * return an error if the client attempt to downgrade to a combination
1193 * of share bits not explicable by closing some of its previous opens.
1194 *
1195 * XXX: This enforcement is actually incomplete, since we don't keep
1196 * track of access/deny bit combinations; so, e.g., we allow:
1197 *
1198 * OPEN allow read, deny write
1199 * OPEN allow both, deny none
1200 * DOWNGRADE allow read, deny none
1201 *
1202 * which we should reject.
1203 */
fd39ca9a 1204static void
1da177e4
LT		 1205set_access(unsigned int *access, unsigned long bmap) {
1206 int i;
1207
1208 *access = 0;
1209 for (i = 1; i < 4; i++) {
1210 if (test_bit(i, &bmap))
1211 *access |= i;
1212 }
1213}
1214
fd39ca9a 1215static void
1da177e4
LT		 1216set_deny(unsigned int *deny, unsigned long bmap) {
1217 int i;
1218
1219 *deny = 0;
1220 for (i = 0; i < 4; i++) {
1221 if (test_bit(i, &bmap))
1222 *deny |= i ;
1223 }
1224}
1225
1226static int
1227test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1228 unsigned int access, deny;
1229
1230 set_access(&access, stp->st_access_bmap);
1231 set_deny(&deny, stp->st_deny_bmap);
1232 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1233 return 0;
1234 return 1;
1235}
1236
1237/*
1238 * Called to check deny when READ with all zero stateid or
1239 * WRITE with all zero or all one stateid
1240 */
b37ad28b 1241static __be32
1da177e4
LT		 1242nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1243{
1244 struct inode *ino = current_fh->fh_dentry->d_inode;
1245 struct nfs4_file *fp;
1246 struct nfs4_stateid *stp;
b37ad28b 1247 __be32 ret;
1da177e4
LT		 1248
1249 dprintk("NFSD: nfs4_share_conflict\n");
1250
1251 fp = find_file(ino);
13cd2184
N		 1252 if (!fp)
1253 return nfs_ok;
b700949b 1254 ret = nfserr_locked;
1da177e4 1255 /* Search for conflicting share reservations */
13cd2184
N		 1256 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1257 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1258 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1259 goto out;
1da177e4 1260 }
13cd2184
N		 1261 ret = nfs_ok;
1262out:
1263 put_nfs4_file(fp);
1264 return ret;
1da177e4
LT		 1265}
1266
1267static inline void
1268nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1269{
1270 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1271 drop_file_write_access(filp);
1da177e4
LT		 1272 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1273 }
1274}
1275
1276/*
1277 * Recall a delegation
1278 */
1279static int
1280do_recall(void *__dp)
1281{
1282 struct nfs4_delegation *dp = __dp;
1283
47f9940c 1284 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1285 nfsd4_cb_recall(dp);
1286 return 0;
1287}
1288
1289/*
1290 * Spawn a thread to perform a recall on the delegation represented
1291 * by the lease (file_lock)
1292 *
1293 * Called from break_lease() with lock_kernel() held.
1294 * Note: we assume break_lease will only call this *once* for any given
1295 * lease.
1296 */
1297static
1298void nfsd_break_deleg_cb(struct file_lock *fl)
1299{
1300 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1301 struct task_struct *t;
1302
1303 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1304 if (!dp)
1305 return;
1306
1307 /* We're assuming the state code never drops its reference
1308 * without first removing the lease. Since we're in this lease
1309 * callback (and since the lease code is serialized by the kernel
1310 * lock) we know the server hasn't removed the lease yet, we know
1311 * it's safe to take a reference: */
1312 atomic_inc(&dp->dl_count);
cfdcad4d 1313 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1314
1315 spin_lock(&recall_lock);
1316 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1317 spin_unlock(&recall_lock);
1318
1319 /* only place dl_time is set. protected by lock_kernel*/
1320 dp->dl_time = get_seconds();
1321
0272e1fd
BF		 1322 /*
1323 * We don't want the locks code to timeout the lease for us;
1324 * we'll remove it ourself if the delegation isn't returned
1325 * in time.
1326 */
1327 fl->fl_break_time = 0;
1da177e4
LT		 1328
1329 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1330 if (IS_ERR(t)) {
1331 struct nfs4_client *clp = dp->dl_client;
1332
1333 printk(KERN_INFO "NFSD: Callback thread failed for "
1334 "for client (clientid %08x/%08x)\n",
1335 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1336 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1337 nfs4_put_delegation(dp);
1338 }
1339}
1340
1341/*
1342 * The file_lock is being reapd.
1343 *
1344 * Called by locks_free_lock() with lock_kernel() held.
1345 */
1346static
1347void nfsd_release_deleg_cb(struct file_lock *fl)
1348{
1349 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1350
1351 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1352
1353 if (!(fl->fl_flags & FL_LEASE) || !dp)
1354 return;
1355 dp->dl_flock = NULL;
1356}
1357
1358/*
1359 * Set the delegation file_lock back pointer.
1360 *
a9933cea 1361 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1362 */
1363static
1364void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1365{
1366 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1367
1368 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1369 if (!dp)
1370 return;
1371 dp->dl_flock = new;
1372}
1373
1374/*
a9933cea 1375 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1376 */
1377static
1378int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1379{
1380 struct nfs4_delegation *onlistd =
1381 (struct nfs4_delegation *)onlist->fl_owner;
1382 struct nfs4_delegation *tryd =
1383 (struct nfs4_delegation *)try->fl_owner;
1384
1385 if (onlist->fl_lmops != try->fl_lmops)
1386 return 0;
1387
1388 return onlistd->dl_client == tryd->dl_client;
1389}
1390
1391
1392static
1393int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1394{
1395 if (arg & F_UNLCK)
1396 return lease_modify(onlist, arg);
1397 else
1398 return -EAGAIN;
1399}
1400
fd39ca9a 1401static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1402 .fl_break = nfsd_break_deleg_cb,
1403 .fl_release_private = nfsd_release_deleg_cb,
1404 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1405 .fl_mylease = nfsd_same_client_deleg_cb,
1406 .fl_change = nfsd_change_deleg_cb,
1407};
1408
1409
b37ad28b 1410__be32
1da177e4
LT		 1411nfsd4_process_open1(struct nfsd4_open *open)
1412{
1da177e4
LT		 1413 clientid_t *clientid = &open->op_clientid;
1414 struct nfs4_client *clp = NULL;
1415 unsigned int strhashval;
1416 struct nfs4_stateowner *sop = NULL;
1417
1da177e4 1418 if (!check_name(open->op_owner))
0f442aa2 1419 return nfserr_inval;
1da177e4
LT		 1420
1421 if (STALE_CLIENTID(&open->op_clientid))
1422 return nfserr_stale_clientid;
1423
1424 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1425 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1426 open->op_stateowner = sop;
1427 if (!sop) {
1428 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1429 clp = find_confirmed_client(clientid);
1430 if (clp == NULL)
0f442aa2
BF		 1431 return nfserr_expired;
1432 goto renew;
1da177e4 1433 }
0f442aa2
BF		 1434 if (!sop->so_confirmed) {
1435 /* Replace unconfirmed owners without checking for replay. */
1436 clp = sop->so_client;
1437 release_stateowner(sop);
1438 open->op_stateowner = NULL;
1439 goto renew;
1440 }
1441 if (open->op_seqid == sop->so_seqid - 1) {
1442 if (sop->so_replay.rp_buflen)
a90b061c 1443 return nfserr_replay_me;
0f442aa2
BF		 1444 /* The original OPEN failed so spectacularly
1445 * that we don't even have replay data saved!
1446 * Therefore, we have no choice but to continue
1447 * processing this OPEN; presumably, we'll
1448 * fail again for the same reason.
1449 */
1450 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1451 goto renew;
1452 }
1453 if (open->op_seqid != sop->so_seqid)
1454 return nfserr_bad_seqid;
1da177e4 1455renew:
0f442aa2
BF		 1456 if (open->op_stateowner == NULL) {
1457 sop = alloc_init_open_stateowner(strhashval, clp, open);
1458 if (sop == NULL)
1459 return nfserr_resource;
1460 open->op_stateowner = sop;
1461 }
1462 list_del_init(&sop->so_close_lru);
1da177e4 1463 renew_client(sop->so_client);
0f442aa2 1464 return nfs_ok;
1da177e4
LT		 1465}
1466
b37ad28b 1467static inline __be32
4a6e43e6
N		 1468nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1469{
1470 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1471 return nfserr_openmode;
1472 else
1473 return nfs_ok;
1474}
1475
52f4fb43
N		 1476static struct nfs4_delegation *
1477find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1478{
1479 struct nfs4_delegation *dp;
1480
ea1da636 1481 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1482 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1483 return dp;
1484 }
1485 return NULL;
1486}
1487
b37ad28b 1488static __be32
567d9829
N		 1489nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1490 struct nfs4_delegation **dp)
1491{
1492 int flags;
b37ad28b 1493 __be32 status = nfserr_bad_stateid;
567d9829
N		 1494
1495 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1496 if (*dp == NULL)
c44c5eeb 1497 goto out;
567d9829
N		 1498 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1499 RD_STATE : WR_STATE;
1500 status = nfs4_check_delegmode(*dp, flags);
1501 if (status)
1502 *dp = NULL;
c44c5eeb
N		 1503out:
1504 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1505 return nfs_ok;
1506 if (status)
1507 return status;
1508 open->op_stateowner->so_confirmed = 1;
1509 return nfs_ok;
567d9829
N		 1510}
1511
b37ad28b 1512static __be32
1da177e4
LT		 1513nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1514{
1515 struct nfs4_stateid *local;
b37ad28b 1516 __be32 status = nfserr_share_denied;
1da177e4
LT		 1517 struct nfs4_stateowner *sop = open->op_stateowner;
1518
8beefa24 1519 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1520 /* ignore lock owners */
1521 if (local->st_stateowner->so_is_open_owner == 0)
1522 continue;
1523 /* remember if we have seen this open owner */
1524 if (local->st_stateowner == sop)
1525 *stpp = local;
1526 /* check for conflicting share reservations */
1527 if (!test_share(local, open))
1528 goto out;
1529 }
1530 status = 0;
1531out:
1532 return status;
1533}
1534
5ac049ac
N		 1535static inline struct nfs4_stateid *
1536nfs4_alloc_stateid(void)
1537{
1538 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1539}
1540
b37ad28b 1541static __be32
1da177e4 1542nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1543 struct nfs4_delegation *dp,
1da177e4
LT		 1544 struct svc_fh *cur_fh, int flags)
1545{
1546 struct nfs4_stateid *stp;
1da177e4 1547
5ac049ac 1548 stp = nfs4_alloc_stateid();
1da177e4
LT		 1549 if (stp == NULL)
1550 return nfserr_resource;
1551
567d9829
N		 1552 if (dp) {
1553 get_file(dp->dl_vfs_file);
1554 stp->st_vfs_file = dp->dl_vfs_file;
1555 } else {
b37ad28b 1556 __be32 status;
567d9829
N		 1557 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1558 &stp->st_vfs_file);
1559 if (status) {
1560 if (status == nfserr_dropit)
1561 status = nfserr_jukebox;
5ac049ac 1562 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1563 return status;
1564 }
1da177e4 1565 }
1da177e4
LT		 1566 *stpp = stp;
1567 return 0;
1568}
1569
b37ad28b 1570static inline __be32
1da177e4
LT		 1571nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1572 struct nfsd4_open *open)
1573{
1574 struct iattr iattr = {
1575 .ia_valid = ATTR_SIZE,
1576 .ia_size = 0,
1577 };
1578 if (!open->op_truncate)
1579 return 0;
1580 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1581 return nfserr_inval;
1da177e4
LT		 1582 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1583}
1584
b37ad28b 1585static __be32
1da177e4
LT		 1586nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1587{
1588 struct file *filp = stp->st_vfs_file;
7eaa36e2 1589 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1590 unsigned int share_access, new_writer;
b37ad28b 1591 __be32 status;
1da177e4
LT		 1592
1593 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1594 new_writer = (~share_access) & open->op_share_access
1595 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1596
6c26d08f 1597 if (new_writer) {
b37ad28b
AV		 1598 int err = get_write_access(inode);
1599 if (err)
1600 return nfserrno(err);
e518f056
BH		 1601 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1602 if (err)
1603 return nfserrno(err);
1604 file_take_write(filp);
6c26d08f 1605 }
1da177e4
LT		 1606 status = nfsd4_truncate(rqstp, cur_fh, open);
1607 if (status) {
6c26d08f
BF		 1608 if (new_writer)
1609 put_write_access(inode);
1da177e4
LT		 1610 return status;
1611 }
1612 /* remember the open */
6c26d08f 1613 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1614 __set_bit(open->op_share_access, &stp->st_access_bmap);
1615 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1616
1617 return nfs_ok;
1618}
1619
1620
1da177e4 1621static void
37515177 1622nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1623{
37515177
N		 1624 open->op_stateowner->so_confirmed = 1;
1625 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1626}
1627
1628/*
1629 * Attempt to hand out a delegation.
1630 */
1631static void
1632nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1633{
1634 struct nfs4_delegation *dp;
1635 struct nfs4_stateowner *sop = stp->st_stateowner;
1636 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1637 struct file_lock fl, *flp = &fl;
1638 int status, flag = 0;
1639
1640 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1641 open->op_recall = 0;
1642 switch (open->op_claim_type) {
1643 case NFS4_OPEN_CLAIM_PREVIOUS:
1644 if (!atomic_read(&cb->cb_set))
1645 open->op_recall = 1;
1646 flag = open->op_delegate_type;
1647 if (flag == NFS4_OPEN_DELEGATE_NONE)
1648 goto out;
1649 break;
1650 case NFS4_OPEN_CLAIM_NULL:
1651 /* Let's not give out any delegations till everyone's
1652 * had the chance to reclaim theirs.... */
af558e33 1653 if (locks_in_grace())
7b190fec
N		 1654 goto out;
1655 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1656 goto out;
1657 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1658 flag = NFS4_OPEN_DELEGATE_WRITE;
1659 else
1660 flag = NFS4_OPEN_DELEGATE_READ;
1661 break;
1662 default:
1663 goto out;
1664 }
1da177e4
LT		 1665
1666 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1667 if (dp == NULL) {
1668 flag = NFS4_OPEN_DELEGATE_NONE;
1669 goto out;
1670 }
1671 locks_init_lock(&fl);
1672 fl.fl_lmops = &nfsd_lease_mng_ops;
1673 fl.fl_flags = FL_LEASE;
9167f501 1674 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1675 fl.fl_end = OFFSET_MAX;
1676 fl.fl_owner = (fl_owner_t)dp;
1677 fl.fl_file = stp->st_vfs_file;
1678 fl.fl_pid = current->tgid;
1679
a9933cea 1680 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1681 * the lock_manager callbacks fl_mylease and fl_change are used
1682 */
9167f501 1683 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1684 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1685 unhash_delegation(dp);
1da177e4
LT		 1686 flag = NFS4_OPEN_DELEGATE_NONE;
1687 goto out;
1688 }
1689
1690 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1691
1692 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1693 dp->dl_stateid.si_boot,
1694 dp->dl_stateid.si_stateownerid,
1695 dp->dl_stateid.si_fileid,
1696 dp->dl_stateid.si_generation);
1697out:
7b190fec
N		 1698 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1699 && flag == NFS4_OPEN_DELEGATE_NONE
1700 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1701 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1702 open->op_delegate_type = flag;
1703}
1704
1705/*
1706 * called with nfs4_lock_state() held.
1707 */
b37ad28b 1708__be32
1da177e4
LT		 1709nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1710{
1711 struct nfs4_file *fp = NULL;
1712 struct inode *ino = current_fh->fh_dentry->d_inode;
1713 struct nfs4_stateid *stp = NULL;
567d9829 1714 struct nfs4_delegation *dp = NULL;
b37ad28b 1715 __be32 status;
1da177e4
LT		 1716
1717 status = nfserr_inval;
ba5a6a19
BF		 1718 if (!access_valid(open->op_share_access)
1719 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1720 goto out;
1721 /*
1722 * Lookup file; if found, lookup stateid and check open request,
1723 * and check for delegations in the process of being recalled.
1724 * If not found, create the nfs4_file struct
1725 */
1726 fp = find_file(ino);
1727 if (fp) {
1728 if ((status = nfs4_check_open(fp, open, &stp)))
1729 goto out;
c44c5eeb
N		 1730 status = nfs4_check_deleg(fp, open, &dp);
1731 if (status)
1732 goto out;
1da177e4 1733 } else {
c44c5eeb
N		 1734 status = nfserr_bad_stateid;
1735 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1736 goto out;
1da177e4
LT		 1737 status = nfserr_resource;
1738 fp = alloc_init_file(ino);
1739 if (fp == NULL)
1740 goto out;
1741 }
1742
1743 /*
1744 * OPEN the file, or upgrade an existing OPEN.
1745 * If truncate fails, the OPEN fails.
1746 */
1747 if (stp) {
1748 /* Stateid was found, this is an OPEN upgrade */
1749 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1750 if (status)
1751 goto out;
444c2c07 1752 update_stateid(&stp->st_stateid);
1da177e4
LT		 1753 } else {
1754 /* Stateid was not found, this is a new OPEN */
1755 int flags = 0;
9ecb6a08 1756 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 1757 flags |= NFSD_MAY_READ;
1da177e4 1758 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 1759 flags |= NFSD_MAY_WRITE;
567d9829
N		 1760 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1761 if (status)
1da177e4
LT		 1762 goto out;
1763 init_stateid(stp, fp, open);
1764 status = nfsd4_truncate(rqstp, current_fh, open);
1765 if (status) {
1766 release_stateid(stp, OPEN_STATE);
1767 goto out;
1768 }
1769 }
1770 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1771
1772 /*
1773 * Attempt to hand out a delegation. No error return, because the
1774 * OPEN succeeds even if we fail.
1775 */
1776 nfs4_open_delegation(current_fh, open, stp);
1777
1778 status = nfs_ok;
1779
1780 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1781 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1782 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1783out:
13cd2184
N		 1784 if (fp)
1785 put_nfs4_file(fp);
37515177
N		 1786 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1787 nfs4_set_claim_prev(open);
1da177e4
LT		 1788 /*
1789 * To finish the open response, we just need to set the rflags.
1790 */
1791 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1792 if (!open->op_stateowner->so_confirmed)
1793 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1794
1795 return status;
1796}
1797
b37ad28b 1798__be32
b591480b
BF		 1799nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1800 clientid_t *clid)
1da177e4
LT		 1801{
1802 struct nfs4_client *clp;
b37ad28b 1803 __be32 status;
1da177e4
LT		 1804
1805 nfs4_lock_state();
1806 dprintk("process_renew(%08x/%08x): starting\n",
1807 clid->cl_boot, clid->cl_id);
1808 status = nfserr_stale_clientid;
1809 if (STALE_CLIENTID(clid))
1810 goto out;
1811 clp = find_confirmed_client(clid);
1812 status = nfserr_expired;
1813 if (clp == NULL) {
1814 /* We assume the client took too long to RENEW. */
1815 dprintk("nfsd4_renew: clientid not found!\n");
1816 goto out;
1817 }
1818 renew_client(clp);
1819 status = nfserr_cb_path_down;
ea1da636 1820 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1821 && !atomic_read(&clp->cl_callback.cb_set))
1822 goto out;
1823 status = nfs_ok;
1824out:
1825 nfs4_unlock_state();
1826 return status;
1827}
1828
af558e33
BF		 1829struct lock_manager nfsd4_manager = {
1830};
1831
a76b4319 1832static void
af558e33 1833nfsd4_end_grace(void)
a76b4319
N		 1834{
1835 dprintk("NFSD: end of grace period\n");
c7b9a459 1836 nfsd4_recdir_purge_old();
af558e33 1837 locks_end_grace(&nfsd4_manager);
a76b4319
N		 1838}
1839
fd39ca9a 1840static time_t
1da177e4
LT		 1841nfs4_laundromat(void)
1842{
1843 struct nfs4_client *clp;
1844 struct nfs4_stateowner *sop;
1845 struct nfs4_delegation *dp;
1846 struct list_head *pos, *next, reaplist;
1847 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1848 time_t t, clientid_val = NFSD_LEASE_TIME;
1849 time_t u, test_val = NFSD_LEASE_TIME;
1850
1851 nfs4_lock_state();
1852
1853 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 1854 if (locks_in_grace())
1855 nfsd4_end_grace();
1da177e4
LT		 1856 list_for_each_safe(pos, next, &client_lru) {
1857 clp = list_entry(pos, struct nfs4_client, cl_lru);
1858 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1859 t = clp->cl_time - cutoff;
1860 if (clientid_val > t)
1861 clientid_val = t;
1862 break;
1863 }
1864 dprintk("NFSD: purging unused client (clientid %08x)\n",
1865 clp->cl_clientid.cl_id);
c7b9a459 1866 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1867 expire_client(clp);
1868 }
1869 INIT_LIST_HEAD(&reaplist);
1870 spin_lock(&recall_lock);
1871 list_for_each_safe(pos, next, &del_recall_lru) {
1872 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1873 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1874 u = dp->dl_time - cutoff;
1875 if (test_val > u)
1876 test_val = u;
1877 break;
1878 }
1879 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1880 dp, dp->dl_flock);
1881 list_move(&dp->dl_recall_lru, &reaplist);
1882 }
1883 spin_unlock(&recall_lock);
1884 list_for_each_safe(pos, next, &reaplist) {
1885 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1886 list_del_init(&dp->dl_recall_lru);
1887 unhash_delegation(dp);
1888 }
1889 test_val = NFSD_LEASE_TIME;
1890 list_for_each_safe(pos, next, &close_lru) {
1891 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1892 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1893 u = sop->so_time - cutoff;
1894 if (test_val > u)
1895 test_val = u;
1896 break;
1897 }
1898 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1899 sop->so_id);
358dd55a 1900 release_stateowner(sop);
1da177e4
LT		 1901 }
1902 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1903 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1904 nfs4_unlock_state();
1905 return clientid_val;
1906}
1907
a254b246
HH		 1908static struct workqueue_struct *laundry_wq;
1909static void laundromat_main(struct work_struct *);
1910static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1911
1912static void
c4028958 1913laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1914{
1915 time_t t;
1916
1917 t = nfs4_laundromat();
1918 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1919 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1920}
1921
fd39ca9a 1922static struct nfs4_stateowner *
f8816512
N		 1923search_close_lru(u32 st_id, int flags)
1924{
1da177e4
LT		 1925 struct nfs4_stateowner *local = NULL;
1926
1da177e4
LT		 1927 if (flags & CLOSE_STATE) {
1928 list_for_each_entry(local, &close_lru, so_close_lru) {
1929 if (local->so_id == st_id)
1930 return local;
1931 }
1932 }
1933 return NULL;
1934}
1935
1936static inline int
1937nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1938{
7eaa36e2 1939 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1940}
1941
1942static int
1943STALE_STATEID(stateid_t *stateid)
1944{
1945 if (stateid->si_boot == boot_time)
1946 return 0;
849823c5 1947 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1948 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1949 stateid->si_generation);
1950 return 1;
1951}
1952
1953static inline int
1954access_permit_read(unsigned long access_bmap)
1955{
1956 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1957 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1958 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1959}
1960
1961static inline int
1962access_permit_write(unsigned long access_bmap)
1963{
1964 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1965 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1966}
1967
1968static
b37ad28b 1969__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1970{
b37ad28b 1971 __be32 status = nfserr_openmode;
1da177e4
LT		 1972
1973 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1974 goto out;
1975 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1976 goto out;
1977 status = nfs_ok;
1978out:
1979 return status;
1980}
1981
b37ad28b 1982static inline __be32
1da177e4
LT		 1983check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1984{
1985 /* Trying to call delegreturn with a special stateid? Yuch: */
1986 if (!(flags & (RD_STATE | WR_STATE)))
1987 return nfserr_bad_stateid;
1988 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1989 return nfs_ok;
af558e33 1990 else if (locks_in_grace()) {
1da177e4
LT		 1991 /* Answer in remaining cases depends on existance of
1992 * conflicting state; so we must wait out the grace period. */
1993 return nfserr_grace;
1994 } else if (flags & WR_STATE)
1995 return nfs4_share_conflict(current_fh,
1996 NFS4_SHARE_DENY_WRITE);
1997 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1998 return nfs4_share_conflict(current_fh,
1999 NFS4_SHARE_DENY_READ);
2000}
2001
2002/*
2003 * Allow READ/WRITE during grace period on recovered state only for files
2004 * that are not able to provide mandatory locking.
2005 */
2006static inline int
2007io_during_grace_disallowed(struct inode *inode, int flags)
2008{
af558e33 2009 return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 2010 && mandatory_lock(inode);
1da177e4
LT		 2011}
2012
0836f587
BF		 2013static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2014{
2015 /* If the client sends us a stateid from the future, it's buggy: */
2016 if (in->si_generation > ref->si_generation)
2017 return nfserr_bad_stateid;
2018 /*
2019 * The following, however, can happen. For example, if the
2020 * client sends an open and some IO at the same time, the open
2021 * may bump si_generation while the IO is still in flight.
2022 * Thanks to hard links and renames, the client never knows what
2023 * file an open will affect. So it could avoid that situation
2024 * only by serializing all opens and IO from the same open
2025 * owner. To recover from the old_stateid error, the client
2026 * will just have to retry the IO:
2027 */
2028 if (in->si_generation < ref->si_generation)
2029 return nfserr_old_stateid;
2030 return nfs_ok;
2031}
2032
1da177e4
LT		 2033/*
2034* Checks for stateid operations
2035*/
b37ad28b 2036__be32
1da177e4
LT		 2037nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2038{
2039 struct nfs4_stateid *stp = NULL;
2040 struct nfs4_delegation *dp = NULL;
2041 stateid_t *stidp;
2042 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2043 __be32 status;
1da177e4
LT		 2044
2045 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2046 stateid->si_boot, stateid->si_stateownerid,
2047 stateid->si_fileid, stateid->si_generation);
2048 if (filpp)
2049 *filpp = NULL;
2050
2051 if (io_during_grace_disallowed(ino, flags))
2052 return nfserr_grace;
2053
2054 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2055 return check_special_stateids(current_fh, stateid, flags);
2056
2057 /* STALE STATEID */
2058 status = nfserr_stale_stateid;
2059 if (STALE_STATEID(stateid))
2060 goto out;
2061
2062 /* BAD STATEID */
2063 status = nfserr_bad_stateid;
2064 if (!stateid->si_fileid) { /* delegation stateid */
2065 if(!(dp = find_delegation_stateid(ino, stateid))) {
2066 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2067 goto out;
2068 }
2069 stidp = &dp->dl_stateid;
2070 } else { /* open or lock stateid */
2071 if (!(stp = find_stateid(stateid, flags))) {
2072 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2073 goto out;
2074 }
2075 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2076 goto out;
2077 if (!stp->st_stateowner->so_confirmed)
2078 goto out;
2079 stidp = &stp->st_stateid;
2080 }
0836f587
BF		 2081 status = check_stateid_generation(stateid, stidp);
2082 if (status)
1da177e4
LT		 2083 goto out;
2084 if (stp) {
2085 if ((status = nfs4_check_openmode(stp,flags)))
2086 goto out;
2087 renew_client(stp->st_stateowner->so_client);
2088 if (filpp)
2089 *filpp = stp->st_vfs_file;
6a85fa3a 2090 } else {
1da177e4
LT		 2091 if ((status = nfs4_check_delegmode(dp, flags)))
2092 goto out;
2093 renew_client(dp->dl_client);
2094 if (flags & DELEG_RET)
2095 unhash_delegation(dp);
2096 if (filpp)
2097 *filpp = dp->dl_vfs_file;
2098 }
2099 status = nfs_ok;
2100out:
2101 return status;
2102}
2103
4c4cd222
N		 2104static inline int
2105setlkflg (int type)
2106{
2107 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2108 RD_STATE : WR_STATE;
2109}
1da177e4
LT		 2110
2111/*
2112 * Checks for sequence id mutating operations.
2113 */
b37ad28b 2114static __be32
4c4cd222 2115nfs4_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 2116{
1da177e4
LT		 2117 struct nfs4_stateid *stp;
2118 struct nfs4_stateowner *sop;
0836f587 2119 __be32 status;
1da177e4
LT		 2120
2121 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2122 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2123 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2124 stateid->si_generation);
3a4f98bb 2125
1da177e4
LT		 2126 *stpp = NULL;
2127 *sopp = NULL;
2128
1da177e4 2129 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2130 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2131 return nfserr_bad_stateid;
1da177e4
LT		 2132 }
2133
1da177e4 2134 if (STALE_STATEID(stateid))
3a4f98bb 2135 return nfserr_stale_stateid;
1da177e4
LT		 2136 /*
2137 * We return BAD_STATEID if filehandle doesn't match stateid,
2138 * the confirmed flag is incorrecly set, or the generation
2139 * number is incorrect.
1da177e4 2140 */
f8816512
N		 2141 stp = find_stateid(stateid, flags);
2142 if (stp == NULL) {
2143 /*
2144 * Also, we should make sure this isn't just the result of
2145 * a replayed close:
2146 */
2147 sop = search_close_lru(stateid->si_stateownerid, flags);
2148 if (sop == NULL)
2149 return nfserr_bad_stateid;
2150 *sopp = sop;
2151 goto check_replay;
2152 }
1da177e4 2153
39325bd0
BF		 2154 *stpp = stp;
2155 *sopp = sop = stp->st_stateowner;
2156
4c4cd222 2157 if (lock) {
4c4cd222 2158 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2159 struct nfs4_client *clp = sop->so_client;
4c4cd222 2160 int lkflg = 0;
b37ad28b 2161 __be32 status;
4c4cd222
N		 2162
2163 lkflg = setlkflg(lock->lk_type);
2164
2165 if (lock->lk_is_new) {
599e0a22
BF		 2166 if (!sop->so_is_open_owner)
2167 return nfserr_bad_stateid;
2168 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2169 return nfserr_bad_stateid;
599e0a22
BF		 2170 /* stp is the open stateid */
2171 status = nfs4_check_openmode(stp, lkflg);
2172 if (status)
2173 return status;
2174 } else {
2175 /* stp is the lock stateid */
2176 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2177 if (status)
2178 return status;
4c4cd222 2179 }
1da177e4
LT		 2180 }
2181
f3362737 2182 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2183 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2184 return nfserr_bad_stateid;
1da177e4
LT		 2185 }
2186
1da177e4
LT		 2187 /*
2188 * We now validate the seqid and stateid generation numbers.
2189 * For the moment, we ignore the possibility of
2190 * generation number wraparound.
2191 */
bd9aac52 2192 if (seqid != sop->so_seqid)
1da177e4
LT		 2193 goto check_replay;
2194
3a4f98bb 2195 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2196 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2197 " unconfirmed stateowner!\n");
2198 return nfserr_bad_stateid;
1da177e4 2199 }
3a4f98bb 2200 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2201 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2202 " confirmed yet!\n");
2203 return nfserr_bad_stateid;
1da177e4 2204 }
0836f587
BF		 2205 status = check_stateid_generation(stateid, &stp->st_stateid);
2206 if (status)
2207 return status;
52fd004e 2208 renew_client(sop->so_client);
3a4f98bb 2209 return nfs_ok;
1da177e4 2210
1da177e4 2211check_replay:
bd9aac52 2212 if (seqid == sop->so_seqid - 1) {
849823c5 2213 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2214 /* indicate replay to calling function */
a90b061c 2215 return nfserr_replay_me;
1da177e4 2216 }
2fdada03 2217 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2218 sop->so_seqid, seqid);
2219 *sopp = NULL;
2220 return nfserr_bad_seqid;
1da177e4
LT		 2221}
2222
b37ad28b 2223__be32
ca364317 2224nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2225 struct nfsd4_open_confirm *oc)
1da177e4 2226{
b37ad28b 2227 __be32 status;
1da177e4
LT		 2228 struct nfs4_stateowner *sop;
2229 struct nfs4_stateid *stp;
2230
2231 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2232 (int)cstate->current_fh.fh_dentry->d_name.len,
2233 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2234
ca364317 2235 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2236 if (status)
2237 return status;
1da177e4
LT		 2238
2239 nfs4_lock_state();
2240
ca364317
BF		 2241 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2242 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2243 CONFIRM | OPEN_STATE,
1da177e4
LT		 2244 &oc->oc_stateowner, &stp, NULL)))
2245 goto out;
2246
2247 sop = oc->oc_stateowner;
2248 sop->so_confirmed = 1;
2249 update_stateid(&stp->st_stateid);
2250 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2251 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2252 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2253 stp->st_stateid.si_boot,
2254 stp->st_stateid.si_stateownerid,
2255 stp->st_stateid.si_fileid,
2256 stp->st_stateid.si_generation);
c7b9a459
N		 2257
2258 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2259out:
f2327d9a 2260 if (oc->oc_stateowner) {
1da177e4 2261 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2262 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2263 }
1da177e4
LT		 2264 nfs4_unlock_state();
2265 return status;
2266}
2267
2268
2269/*
2270 * unset all bits in union bitmap (bmap) that
2271 * do not exist in share (from successful OPEN_DOWNGRADE)
2272 */
2273static void
2274reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2275{
2276 int i;
2277 for (i = 1; i < 4; i++) {
2278 if ((i & access) != i)
2279 __clear_bit(i, bmap);
2280 }
2281}
2282
2283static void
2284reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2285{
2286 int i;
2287 for (i = 0; i < 4; i++) {
2288 if ((i & deny) != i)
2289 __clear_bit(i, bmap);
2290 }
2291}
2292
b37ad28b 2293__be32
ca364317
BF		 2294nfsd4_open_downgrade(struct svc_rqst *rqstp,
2295 struct nfsd4_compound_state *cstate,
a4f1706a 2296 struct nfsd4_open_downgrade *od)
1da177e4 2297{
b37ad28b 2298 __be32 status;
1da177e4
LT		 2299 struct nfs4_stateid *stp;
2300 unsigned int share_access;
2301
2302 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2303 (int)cstate->current_fh.fh_dentry->d_name.len,
2304 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2305
ba5a6a19
BF		 2306 if (!access_valid(od->od_share_access)
2307 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2308 return nfserr_inval;
2309
2310 nfs4_lock_state();
ca364317
BF		 2311 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2312 od->od_seqid,
1da177e4 2313 &od->od_stateid,
f3362737 2314 OPEN_STATE,
1da177e4
LT		 2315 &od->od_stateowner, &stp, NULL)))
2316 goto out;
2317
2318 status = nfserr_inval;
2319 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2320 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2321 stp->st_access_bmap, od->od_share_access);
2322 goto out;
2323 }
2324 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2325 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2326 stp->st_deny_bmap, od->od_share_deny);
2327 goto out;
2328 }
2329 set_access(&share_access, stp->st_access_bmap);
2330 nfs4_file_downgrade(stp->st_vfs_file,
2331 share_access & ~od->od_share_access);
2332
2333 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2334 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2335
2336 update_stateid(&stp->st_stateid);
2337 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2338 status = nfs_ok;
2339out:
f2327d9a 2340 if (od->od_stateowner) {
1da177e4 2341 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2342 cstate->replay_owner = od->od_stateowner;
f2327d9a 2343 }
1da177e4
LT		 2344 nfs4_unlock_state();
2345 return status;
2346}
2347
2348/*
2349 * nfs4_unlock_state() called after encode
2350 */
b37ad28b 2351__be32
ca364317 2352nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2353 struct nfsd4_close *close)
1da177e4 2354{
b37ad28b 2355 __be32 status;
1da177e4
LT		 2356 struct nfs4_stateid *stp;
2357
2358 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2359 (int)cstate->current_fh.fh_dentry->d_name.len,
2360 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2361
2362 nfs4_lock_state();
2363 /* check close_lru for replay */
ca364317
BF		 2364 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2365 close->cl_seqid,
1da177e4 2366 &close->cl_stateid,
f3362737 2367 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2368 &close->cl_stateowner, &stp, NULL)))
2369 goto out;
1da177e4
LT		 2370 status = nfs_ok;
2371 update_stateid(&stp->st_stateid);
2372 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2373
04ef5954
BF		 2374 /* release_stateid() calls nfsd_close() if needed */
2375 release_stateid(stp, OPEN_STATE);
2376
2377 /* place unused nfs4_stateowners on so_close_lru list to be
2378 * released by the laundromat service after the lease period
2379 * to enable us to handle CLOSE replay
2380 */
2381 if (list_empty(&close->cl_stateowner->so_stateids))
2382 move_to_close_lru(close->cl_stateowner);
1da177e4 2383out:
f2327d9a 2384 if (close->cl_stateowner) {
1da177e4 2385 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2386 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2387 }
1da177e4
LT		 2388 nfs4_unlock_state();
2389 return status;
2390}
2391
b37ad28b 2392__be32
ca364317
BF		 2393nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2394 struct nfsd4_delegreturn *dr)
1da177e4 2395{
b37ad28b 2396 __be32 status;
1da177e4 2397
ca364317 2398 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2399 goto out;
2400
2401 nfs4_lock_state();
ca364317
BF		 2402 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2403 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2404 nfs4_unlock_state();
2405out:
2406 return status;
2407}
2408
2409
2410/*
2411 * Lock owner state (byte-range locks)
2412 */
2413#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2414#define LOCK_HASH_BITS 8
2415#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2416#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2417
2418#define lockownerid_hashval(id) \
2419 ((id) & LOCK_HASH_MASK)
2420
2421static inline unsigned int
2422lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2423 struct xdr_netobj *ownername)
2424{
2425 return (file_hashval(inode) + cl_id
2426 + opaque_hashval(ownername->data, ownername->len))
2427 & LOCK_HASH_MASK;
2428}
2429
2430static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2431static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2432static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2433
fd39ca9a 2434static struct nfs4_stateid *
1da177e4
LT		 2435find_stateid(stateid_t *stid, int flags)
2436{
2437 struct nfs4_stateid *local = NULL;
2438 u32 st_id = stid->si_stateownerid;
2439 u32 f_id = stid->si_fileid;
2440 unsigned int hashval;
2441
2442 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2443 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2444 hashval = stateid_hashval(st_id, f_id);
2445 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2446 if ((local->st_stateid.si_stateownerid == st_id) &&
2447 (local->st_stateid.si_fileid == f_id))
2448 return local;
2449 }
2450 }
2451 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2452 hashval = stateid_hashval(st_id, f_id);
2453 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2454 if ((local->st_stateid.si_stateownerid == st_id) &&
2455 (local->st_stateid.si_fileid == f_id))
2456 return local;
2457 }
849823c5 2458 }
1da177e4
LT		 2459 return NULL;
2460}
2461
2462static struct nfs4_delegation *
2463find_delegation_stateid(struct inode *ino, stateid_t *stid)
2464{
13cd2184
N		 2465 struct nfs4_file *fp;
2466 struct nfs4_delegation *dl;
1da177e4
LT		 2467
2468 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2469 stid->si_boot, stid->si_stateownerid,
2470 stid->si_fileid, stid->si_generation);
2471
1da177e4 2472 fp = find_file(ino);
13cd2184
N		 2473 if (!fp)
2474 return NULL;
2475 dl = find_delegation_file(fp, stid);
2476 put_nfs4_file(fp);
2477 return dl;
1da177e4
LT		 2478}
2479
2480/*
2481 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2482 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2483 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2484 * locking, this prevents us from being completely protocol-compliant. The
2485 * real solution to this problem is to start using unsigned file offsets in
2486 * the VFS, but this is a very deep change!
2487 */
2488static inline void
2489nfs4_transform_lock_offset(struct file_lock *lock)
2490{
2491 if (lock->fl_start < 0)
2492 lock->fl_start = OFFSET_MAX;
2493 if (lock->fl_end < 0)
2494 lock->fl_end = OFFSET_MAX;
2495}
2496
d5b9026a
N		 2497/* Hack!: For now, we're defining this just so we can use a pointer to it
2498 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2499static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2500};
1da177e4
LT		 2501
2502static inline void
2503nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2504{
d5b9026a
N		 2505 struct nfs4_stateowner *sop;
2506 unsigned int hval;
1da177e4 2507
d5b9026a
N		 2508 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2509 sop = (struct nfs4_stateowner *) fl->fl_owner;
2510 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2511 kref_get(&sop->so_ref);
2512 deny->ld_sop = sop;
2513 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2514 } else {
2515 deny->ld_sop = NULL;
2516 deny->ld_clientid.cl_boot = 0;
2517 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2518 }
2519 deny->ld_start = fl->fl_start;
2520 deny->ld_length = ~(u64)0;
2521 if (fl->fl_end != ~(u64)0)
2522 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2523 deny->ld_type = NFS4_READ_LT;
2524 if (fl->fl_type != F_RDLCK)
2525 deny->ld_type = NFS4_WRITE_LT;
2526}
2527
1da177e4
LT		 2528static struct nfs4_stateowner *
2529find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2530 struct xdr_netobj *owner)
2531{
2532 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2533 struct nfs4_stateowner *op;
2534
2535 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2536 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2537 return op;
2538 }
2539 return NULL;
2540}
2541
2542/*
2543 * Alloc a lock owner structure.
2544 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2545 * occured.
2546 *
2547 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2548 */
2549
2550static struct nfs4_stateowner *
2551alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2552 struct nfs4_stateowner *sop;
2553 struct nfs4_replay *rp;
2554 unsigned int idhashval;
2555
2556 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2557 return NULL;
2558 idhashval = lockownerid_hashval(current_ownerid);
2559 INIT_LIST_HEAD(&sop->so_idhash);
2560 INIT_LIST_HEAD(&sop->so_strhash);
2561 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2562 INIT_LIST_HEAD(&sop->so_stateids);
2563 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2564 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2565 sop->so_time = 0;
2566 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2567 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2568 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2569 sop->so_is_open_owner = 0;
2570 sop->so_id = current_ownerid++;
2571 sop->so_client = clp;
b59e3c0e
NB		 2572 /* It is the openowner seqid that will be incremented in encode in the
2573 * case of new lockowners; so increment the lock seqid manually: */
2574 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2575 sop->so_confirmed = 1;
2576 rp = &sop->so_replay;
de1ae286 2577 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2578 rp->rp_buflen = 0;
2579 rp->rp_buf = rp->rp_ibuf;
2580 return sop;
2581}
2582
fd39ca9a 2583static struct nfs4_stateid *
1da177e4
LT		 2584alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2585{
2586 struct nfs4_stateid *stp;
2587 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2588
5ac049ac
N		 2589 stp = nfs4_alloc_stateid();
2590 if (stp == NULL)
1da177e4
LT		 2591 goto out;
2592 INIT_LIST_HEAD(&stp->st_hash);
2593 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2594 INIT_LIST_HEAD(&stp->st_perstateowner);
2595 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2596 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2597 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2598 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2599 stp->st_stateowner = sop;
13cd2184 2600 get_nfs4_file(fp);
1da177e4
LT		 2601 stp->st_file = fp;
2602 stp->st_stateid.si_boot = boot_time;
2603 stp->st_stateid.si_stateownerid = sop->so_id;
2604 stp->st_stateid.si_fileid = fp->fi_id;
2605 stp->st_stateid.si_generation = 0;
2606 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2607 stp->st_access_bmap = open_stp->st_access_bmap;
2608 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2609 stp->st_openstp = open_stp;
1da177e4
LT		 2610
2611out:
2612 return stp;
2613}
2614
fd39ca9a 2615static int
1da177e4
LT		 2616check_lock_length(u64 offset, u64 length)
2617{
2618 return ((length == 0) || ((length != ~(u64)0) &&
2619 LOFF_OVERFLOW(offset, length)));
2620}
2621
2622/*
2623 * LOCK operation
2624 */
b37ad28b 2625__be32
ca364317 2626nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2627 struct nfsd4_lock *lock)
1da177e4 2628{
3e9e3dbe 2629 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2630 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2631 struct nfs4_stateid *lock_stp;
2632 struct file *filp;
2633 struct file_lock file_lock;
8dc7c311 2634 struct file_lock conflock;
b37ad28b 2635 __be32 status = 0;
1da177e4 2636 unsigned int strhashval;
150b3934 2637 unsigned int cmd;
b8dd7b9a 2638 int err;
1da177e4
LT		 2639
2640 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2641 (long long) lock->lk_offset,
2642 (long long) lock->lk_length);
2643
1da177e4
LT		 2644 if (check_lock_length(lock->lk_offset, lock->lk_length))
2645 return nfserr_inval;
2646
ca364317 2647 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2648 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2649 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2650 return status;
2651 }
2652
1da177e4
LT		 2653 nfs4_lock_state();
2654
2655 if (lock->lk_is_new) {
893f8770
N		 2656 /*
2657 * Client indicates that this is a new lockowner.
2658 * Use open owner and open stateid to create lock owner and
2659 * lock stateid.
2660 */
1da177e4
LT		 2661 struct nfs4_stateid *open_stp = NULL;
2662 struct nfs4_file *fp;
2663
2664 status = nfserr_stale_clientid;
849823c5 2665 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2666 goto out;
1da177e4 2667
1da177e4 2668 /* validate and update open stateid and open seqid */
ca364317 2669 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2670 lock->lk_new_open_seqid,
2671 &lock->lk_new_open_stateid,
f3362737 2672 OPEN_STATE,
3a65588a 2673 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2674 lock);
37515177 2675 if (status)
1da177e4 2676 goto out;
3a65588a 2677 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2678 /* create lockowner and lock stateid */
2679 fp = open_stp->st_file;
2680 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2681 open_sop->so_client->cl_clientid.cl_id,
2682 &lock->v.new.owner);
3e9e3dbe
N		 2683 /* XXX: Do we need to check for duplicate stateowners on
2684 * the same file, or should they just be allowed (and
2685 * create new stateids)? */
1da177e4 2686 status = nfserr_resource;
b59e3c0e
NB		 2687 lock_sop = alloc_init_lock_stateowner(strhashval,
2688 open_sop->so_client, open_stp, lock);
2689 if (lock_sop == NULL)
1da177e4 2690 goto out;
b59e3c0e 2691 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2692 if (lock_stp == NULL)
1da177e4 2693 goto out;
1da177e4
LT		 2694 } else {
2695 /* lock (lock owner + lock stateid) already exists */
ca364317 2696 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2697 lock->lk_old_lock_seqid,
2698 &lock->lk_old_lock_stateid,
f3362737 2699 LOCK_STATE,
3a65588a 2700 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2701 if (status)
2702 goto out;
3a65588a 2703 lock_sop = lock->lk_replay_owner;
1da177e4 2704 }
3a65588a 2705 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2706 filp = lock_stp->st_vfs_file;
2707
0dd395dc 2708 status = nfserr_grace;
af558e33 2709 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 2710 goto out;
2711 status = nfserr_no_grace;
af558e33 2712 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 2713 goto out;
2714
1da177e4
LT		 2715 locks_init_lock(&file_lock);
2716 switch (lock->lk_type) {
2717 case NFS4_READ_LT:
2718 case NFS4_READW_LT:
2719 file_lock.fl_type = F_RDLCK;
150b3934 2720 cmd = F_SETLK;
1da177e4
LT		 2721 break;
2722 case NFS4_WRITE_LT:
2723 case NFS4_WRITEW_LT:
2724 file_lock.fl_type = F_WRLCK;
150b3934 2725 cmd = F_SETLK;
1da177e4
LT		 2726 break;
2727 default:
2728 status = nfserr_inval;
2729 goto out;
2730 }
b59e3c0e 2731 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2732 file_lock.fl_pid = current->tgid;
2733 file_lock.fl_file = filp;
2734 file_lock.fl_flags = FL_POSIX;
d5b9026a 2735 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2736
2737 file_lock.fl_start = lock->lk_offset;
2738 if ((lock->lk_length == ~(u64)0) ||
2739 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2740 file_lock.fl_end = ~(u64)0;
2741 else
2742 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2743 nfs4_transform_lock_offset(&file_lock);
2744
2745 /*
2746 * Try to lock the file in the VFS.
2747 * Note: locks.c uses the BKL to protect the inode's lock list.
2748 */
2749
fd85b817 2750 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2751 switch (-err) {
1da177e4
LT		 2752 case 0: /* success! */
2753 update_stateid(&lock_stp->st_stateid);
2754 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2755 sizeof(stateid_t));
b8dd7b9a 2756 status = 0;
eb76b3fd
AA		 2757 break;
2758 case (EAGAIN): /* conflock holds conflicting lock */
2759 status = nfserr_denied;
2760 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2761 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2762 break;
1da177e4
LT		 2763 case (EDEADLK):
2764 status = nfserr_deadlock;
eb76b3fd 2765 break;
1da177e4 2766 default:
fd85b817 2767 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2768 status = nfserr_resource;
2769 break;
1da177e4 2770 }
1da177e4 2771out:
8a280510
BF		 2772 if (status && lock->lk_is_new && lock_sop)
2773 release_stateowner(lock_sop);
3a65588a
BF		 2774 if (lock->lk_replay_owner) {
2775 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2776 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2777 }
1da177e4
LT		 2778 nfs4_unlock_state();
2779 return status;
2780}
2781
2782/*
2783 * LOCKT operation
2784 */
b37ad28b 2785__be32
ca364317
BF		 2786nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2787 struct nfsd4_lockt *lockt)
1da177e4
LT		 2788{
2789 struct inode *inode;
2790 struct file file;
2791 struct file_lock file_lock;
fd85b817 2792 int error;
b37ad28b 2793 __be32 status;
1da177e4 2794
af558e33 2795 if (locks_in_grace())
1da177e4
LT		 2796 return nfserr_grace;
2797
2798 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2799 return nfserr_inval;
2800
2801 lockt->lt_stateowner = NULL;
2802 nfs4_lock_state();
2803
2804 status = nfserr_stale_clientid;
849823c5 2805 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2806 goto out;
1da177e4 2807
ca364317 2808 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2809 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2810 if (status == nfserr_symlink)
2811 status = nfserr_inval;
2812 goto out;
2813 }
2814
ca364317 2815 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2816 locks_init_lock(&file_lock);
2817 switch (lockt->lt_type) {
2818 case NFS4_READ_LT:
2819 case NFS4_READW_LT:
2820 file_lock.fl_type = F_RDLCK;
2821 break;
2822 case NFS4_WRITE_LT:
2823 case NFS4_WRITEW_LT:
2824 file_lock.fl_type = F_WRLCK;
2825 break;
2826 default:
2fdada03 2827 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2828 status = nfserr_inval;
2829 goto out;
2830 }
2831
2832 lockt->lt_stateowner = find_lockstateowner_str(inode,
2833 &lockt->lt_clientid, &lockt->lt_owner);
2834 if (lockt->lt_stateowner)
2835 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2836 file_lock.fl_pid = current->tgid;
2837 file_lock.fl_flags = FL_POSIX;
d5b9026a 2838 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2839
2840 file_lock.fl_start = lockt->lt_offset;
2841 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2842 file_lock.fl_end = ~(u64)0;
2843 else
2844 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2845
2846 nfs4_transform_lock_offset(&file_lock);
2847
fd85b817 2848 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2849 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2850 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2851 * only the dentry:inode set.
2852 */
2853 memset(&file, 0, sizeof (struct file));
ca364317 2854 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2855
2856 status = nfs_ok;
fd85b817
ME		 2857 error = vfs_test_lock(&file, &file_lock);
2858 if (error) {
2859 status = nfserrno(error);
2860 goto out;
2861 }
9d6a8c5c 2862 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2863 status = nfserr_denied;
9d6a8c5c 2864 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2865 }
2866out:
2867 nfs4_unlock_state();
2868 return status;
2869}
2870
b37ad28b 2871__be32
ca364317 2872nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2873 struct nfsd4_locku *locku)
1da177e4
LT		 2874{
2875 struct nfs4_stateid *stp;
2876 struct file *filp = NULL;
2877 struct file_lock file_lock;
b37ad28b 2878 __be32 status;
b8dd7b9a 2879 int err;
1da177e4
LT		 2880
2881 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2882 (long long) locku->lu_offset,
2883 (long long) locku->lu_length);
2884
2885 if (check_lock_length(locku->lu_offset, locku->lu_length))
2886 return nfserr_inval;
2887
2888 nfs4_lock_state();
2889
ca364317 2890 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2891 locku->lu_seqid,
2892 &locku->lu_stateid,
f3362737 2893 LOCK_STATE,
1da177e4
LT		 2894 &locku->lu_stateowner, &stp, NULL)))
2895 goto out;
2896
2897 filp = stp->st_vfs_file;
2898 BUG_ON(!filp);
2899 locks_init_lock(&file_lock);
2900 file_lock.fl_type = F_UNLCK;
2901 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2902 file_lock.fl_pid = current->tgid;
2903 file_lock.fl_file = filp;
2904 file_lock.fl_flags = FL_POSIX;
d5b9026a 2905 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2906 file_lock.fl_start = locku->lu_offset;
2907
2908 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2909 file_lock.fl_end = ~(u64)0;
2910 else
2911 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2912 nfs4_transform_lock_offset(&file_lock);
2913
2914 /*
2915 * Try to unlock the file in the VFS.
2916 */
fd85b817 2917 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2918 if (err) {
fd85b817 2919 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2920 goto out_nfserr;
2921 }
2922 /*
2923 * OK, unlock succeeded; the only thing left to do is update the stateid.
2924 */
2925 update_stateid(&stp->st_stateid);
2926 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2927
2928out:
f2327d9a 2929 if (locku->lu_stateowner) {
1da177e4 2930 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2931 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2932 }
1da177e4
LT		 2933 nfs4_unlock_state();
2934 return status;
2935
2936out_nfserr:
b8dd7b9a 2937 status = nfserrno(err);
1da177e4
LT		 2938 goto out;
2939}
2940
2941/*
2942 * returns
2943 * 1: locks held by lockowner
2944 * 0: no locks held by lockowner
2945 */
2946static int
2947check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2948{
2949 struct file_lock **flpp;
7eaa36e2 2950 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2951 int status = 0;
2952
2953 lock_kernel();
2954 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2955 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2956 status = 1;
2957 goto out;
796dadfd 2958 }
1da177e4
LT		 2959 }
2960out:
2961 unlock_kernel();
2962 return status;
2963}
2964
b37ad28b 2965__be32
b591480b
BF		 2966nfsd4_release_lockowner(struct svc_rqst *rqstp,
2967 struct nfsd4_compound_state *cstate,
2968 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2969{
2970 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2971 struct nfs4_stateowner *sop;
2972 struct nfs4_stateid *stp;
1da177e4 2973 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2974 struct list_head matches;
2975 int i;
b37ad28b 2976 __be32 status;
1da177e4
LT		 2977
2978 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2979 clid->cl_boot, clid->cl_id);
2980
2981 /* XXX check for lease expiration */
2982
2983 status = nfserr_stale_clientid;
849823c5 2984 if (STALE_CLIENTID(clid))
1da177e4 2985 return status;
1da177e4
LT		 2986
2987 nfs4_lock_state();
2988
3e9e3dbe
N		 2989 status = nfserr_locks_held;
2990 /* XXX: we're doing a linear search through all the lockowners.
2991 * Yipes! For now we'll just hope clients aren't really using
2992 * release_lockowner much, but eventually we have to fix these
2993 * data structures. */
2994 INIT_LIST_HEAD(&matches);
2995 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2996 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 2997 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 2998 continue;
2999 list_for_each_entry(stp, &sop->so_stateids,
3000 st_perstateowner) {
3001 if (check_for_locks(stp->st_vfs_file, sop))
3002 goto out;
3003 /* Note: so_perclient unused for lockowners,
3004 * so it's OK to fool with here. */
3005 list_add(&sop->so_perclient, &matches);
3006 }
1da177e4 3007 }
3e9e3dbe
N		 3008 }
3009 /* Clients probably won't expect us to return with some (but not all)
3010 * of the lockowner state released; so don't release any until all
3011 * have been checked. */
3012 status = nfs_ok;
0fa822e4
N		 3013 while (!list_empty(&matches)) {
3014 sop = list_entry(matches.next, struct nfs4_stateowner,
3015 so_perclient);
3016 /* unhash_stateowner deletes so_perclient only
3017 * for openowners. */
3018 list_del(&sop->so_perclient);
3e9e3dbe 3019 release_stateowner(sop);
1da177e4
LT		 3020 }
3021out:
3022 nfs4_unlock_state();
3023 return status;
3024}
3025
3026static inline struct nfs4_client_reclaim *
a55370a3 3027alloc_reclaim(void)
1da177e4 3028{
a55370a3 3029 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3030}
3031
c7b9a459
N		 3032int
3033nfs4_has_reclaimed_state(const char *name)
3034{
3035 unsigned int strhashval = clientstr_hashval(name);
3036 struct nfs4_client *clp;
3037
3038 clp = find_confirmed_client_by_str(name, strhashval);
3039 return clp ? 1 : 0;
3040}
3041
1da177e4
LT		 3042/*
3043 * failure => all reset bets are off, nfserr_no_grace...
3044 */
190e4fbf
N		 3045int
3046nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3047{
3048 unsigned int strhashval;
3049 struct nfs4_client_reclaim *crp = NULL;
3050
a55370a3
N		 3051 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3052 crp = alloc_reclaim();
1da177e4
LT		 3053 if (!crp)
3054 return 0;
a55370a3 3055 strhashval = clientstr_hashval(name);
1da177e4
LT		 3056 INIT_LIST_HEAD(&crp->cr_strhash);
3057 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3058 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3059 reclaim_str_hashtbl_size++;
3060 return 1;
3061}
3062
3063static void
3064nfs4_release_reclaim(void)
3065{
3066 struct nfs4_client_reclaim *crp = NULL;
3067 int i;
3068
1da177e4
LT		 3069 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3070 while (!list_empty(&reclaim_str_hashtbl[i])) {
3071 crp = list_entry(reclaim_str_hashtbl[i].next,
3072 struct nfs4_client_reclaim, cr_strhash);
3073 list_del(&crp->cr_strhash);
1da177e4
LT		 3074 kfree(crp);
3075 reclaim_str_hashtbl_size--;
3076 }
3077 }
3078 BUG_ON(reclaim_str_hashtbl_size);
3079}
3080
3081/*
3082 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3083static struct nfs4_client_reclaim *
1da177e4
LT		 3084nfs4_find_reclaim_client(clientid_t *clid)
3085{
3086 unsigned int strhashval;
3087 struct nfs4_client *clp;
3088 struct nfs4_client_reclaim *crp = NULL;
3089
3090
3091 /* find clientid in conf_id_hashtbl */
3092 clp = find_confirmed_client(clid);
3093 if (clp == NULL)
3094 return NULL;
3095
a55370a3
N		 3096 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3097 clp->cl_name.len, clp->cl_name.data,
3098 clp->cl_recdir);
1da177e4
LT		 3099
3100 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3101 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3102 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3103 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3104 return crp;
3105 }
3106 }
3107 return NULL;
3108}
3109
3110/*
3111* Called from OPEN. Look for clientid in reclaim list.
3112*/
b37ad28b 3113__be32
1da177e4
LT		 3114nfs4_check_open_reclaim(clientid_t *clid)
3115{
dfc83565 3116 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3117}
3118
ac4d8ff2 3119/* initialization to perform at module load time: */
1da177e4 3120
e8ff2a84 3121int
ac4d8ff2 3122nfs4_state_init(void)
1da177e4 3123{
e8ff2a84 3124 int i, status;
1da177e4 3125
e8ff2a84
BF		 3126 status = nfsd4_init_slabs();
3127 if (status)
3128 return status;
1da177e4
LT		 3129 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3130 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3131 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3132 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3133 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3134 }
3135 for (i = 0; i < FILE_HASH_SIZE; i++) {
3136 INIT_LIST_HEAD(&file_hashtbl[i]);
3137 }
3138 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3139 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3140 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3141 }
3142 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3143 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3144 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3145 }
3146 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3147 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3148 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3149 }
1da177e4 3150 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3151 INIT_LIST_HEAD(&close_lru);
3152 INIT_LIST_HEAD(&client_lru);
3153 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3154 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3155 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3156 reclaim_str_hashtbl_size = 0;
e8ff2a84 3157 return 0;
ac4d8ff2
N		 3158}
3159
190e4fbf
N		 3160static void
3161nfsd4_load_reboot_recovery_data(void)
3162{
3163 int status;
3164
0964a3d3
N		 3165 nfs4_lock_state();
3166 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3167 status = nfsd4_recdir_load();
0964a3d3 3168 nfs4_unlock_state();
190e4fbf
N		 3169 if (status)
3170 printk("NFSD: Failure reading reboot recovery data\n");
3171}
3172
9a8db97e
ME		 3173unsigned long
3174get_nfs4_grace_period(void)
3175{
3176 return max(user_lease_time, lease_time) * HZ;
3177}
3178
c2f1a551
MS		 3179/*
3180 * Since the lifetime of a delegation isn't limited to that of an open, a
3181 * client may quite reasonably hang on to a delegation as long as it has
3182 * the inode cached. This becomes an obvious problem the first time a
3183 * client's inode cache approaches the size of the server's total memory.
3184 *
3185 * For now we avoid this problem by imposing a hard limit on the number
3186 * of delegations, which varies according to the server's memory size.
3187 */
3188static void
3189set_max_delegations(void)
3190{
3191 /*
3192 * Allow at most 4 delegations per megabyte of RAM. Quick
3193 * estimates suggest that in the worst case (where every delegation
3194 * is for a different inode), a delegation could take about 1.5K,
3195 * giving a worst case usage of about 6% of memory.
3196 */
3197 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3198}
3199
ac4d8ff2
N		 3200/* initialization to perform when the nfsd service is started: */
3201
3202static void
3203__nfs4_state_start(void)
3204{
9a8db97e 3205 unsigned long grace_time;
ac4d8ff2 3206
1da177e4 3207 boot_time = get_seconds();
af558e33 3208 grace_time = get_nfs4_grace_period();
d99a05ad 3209 lease_time = user_lease_time;
af558e33 3210 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3211 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3212 grace_time/HZ);
58da282b 3213 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3214 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3215 set_max_delegations();
1da177e4
LT		 3216}
3217
e8ff2a84 3218void
76a3550e 3219nfs4_state_start(void)
1da177e4 3220{
1da177e4 3221 if (nfs4_init)
e8ff2a84 3222 return;
190e4fbf 3223 nfsd4_load_reboot_recovery_data();
76a3550e 3224 __nfs4_state_start();
1da177e4 3225 nfs4_init = 1;
e8ff2a84 3226 return;
1da177e4
LT		 3227}
3228
1da177e4
LT		 3229time_t
3230nfs4_lease_time(void)
3231{
3232 return lease_time;
3233}
3234
3235static void
3236__nfs4_state_shutdown(void)
3237{
3238 int i;
3239 struct nfs4_client *clp = NULL;
3240 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3241 struct list_head *pos, *next, reaplist;
3242
1da177e4
LT		 3243 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3244 while (!list_empty(&conf_id_hashtbl[i])) {
3245 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3246 expire_client(clp);
3247 }
3248 while (!list_empty(&unconf_str_hashtbl[i])) {
3249 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3250 expire_client(clp);
3251 }
3252 }
3253 INIT_LIST_HEAD(&reaplist);
3254 spin_lock(&recall_lock);
3255 list_for_each_safe(pos, next, &del_recall_lru) {
3256 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3257 list_move(&dp->dl_recall_lru, &reaplist);
3258 }
3259 spin_unlock(&recall_lock);
3260 list_for_each_safe(pos, next, &reaplist) {
3261 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3262 list_del_init(&dp->dl_recall_lru);
3263 unhash_delegation(dp);
3264 }
3265
190e4fbf 3266 nfsd4_shutdown_recdir();
1da177e4 3267 nfs4_init = 0;
1da177e4
LT		 3268}
3269
3270void
3271nfs4_state_shutdown(void)
3272{
5e8d5c29
N		 3273 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3274 destroy_workqueue(laundry_wq);
2c5e7615 3275 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3276 nfs4_lock_state();
3277 nfs4_release_reclaim();
3278 __nfs4_state_shutdown();
1da177e4
LT		 3279 nfs4_unlock_state();
3280}
3281
3dd98a3b
JL		 3282/*
3283 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3284 * accessed when nfsd is starting.
3285 */
0964a3d3
N		 3286static void
3287nfs4_set_recdir(char *recdir)
3288{
0964a3d3 3289 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3290}
3291
3292/*
3293 * Change the NFSv4 recovery directory to recdir.
3294 */
3295int
3296nfs4_reset_recoverydir(char *recdir)
3297{
3298 int status;
a63bb996 3299 struct path path;
0964a3d3 3300
a63bb996 3301 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3302 if (status)
3303 return status;
3304 status = -ENOTDIR;
a63bb996 3305 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3306 nfs4_set_recdir(recdir);
3307 status = 0;
3308 }
a63bb996 3309 path_put(&path);
0964a3d3
N		 3310 return status;
3311}
3312
3dd98a3b
JL		 3313char *
3314nfs4_recoverydir(void)
3315{
3316 return user_recovery_dirname;
3317}
3318
1da177e4
LT		 3319/*
3320 * Called when leasetime is changed.
3321 *
d99a05ad
N		 3322 * The only way the protocol gives us to handle on-the-fly lease changes is to
3323 * simulate a reboot. Instead of doing that, we just wait till the next time
3324 * we start to register any changes in lease time. If the administrator
3325 * really wants to change the lease time *now*, they can go ahead and bring
3326 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3327 *
3328 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3329 * when nfsd is starting
1da177e4
LT		 3330 */
3331void
3332nfs4_reset_lease(time_t leasetime)
3333{
d99a05ad 3334 user_lease_time = leasetime;
1da177e4 3335}
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