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