projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] knfsd: SUNRPC: Use sockaddr_storage to store address in svc_deferred_req
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
0964a3d3 51#include <linux/namei.h>
353ab6e9 52#include <linux/mutex.h>
1da177e4
LT		 53
54#define NFSDDBG_FACILITY NFSDDBG_PROC
55
56/* Globals */
57static time_t lease_time = 90; /* default lease time */
d99a05ad 58static time_t user_lease_time = 90;
fd39ca9a 59static time_t boot_time;
a76b4319 60static int in_grace = 1;
1da177e4
LT		 61static u32 current_clientid = 1;
62static u32 current_ownerid = 1;
63static u32 current_fileid = 1;
64static u32 current_delegid = 1;
65static u32 nfs4_init;
fd39ca9a
N		 66static stateid_t zerostateid; /* bits all 0 */
67static stateid_t onestateid; /* bits all 1 */
68
69#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
70#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 71
1da177e4 72/* forward declarations */
fd39ca9a 73static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 74static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
75static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 76static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
77static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 78
79/* Locking:
80 *
353ab6e9 81 * client_mutex:
1da177e4
LT		 82 * protects clientid_hashtbl[], clientstr_hashtbl[],
83 * unconfstr_hashtbl[], uncofid_hashtbl[].
84 */
353ab6e9 85static DEFINE_MUTEX(client_mutex);
1da177e4 86
e18b890b
CL		 87static struct kmem_cache *stateowner_slab = NULL;
88static struct kmem_cache *file_slab = NULL;
89static struct kmem_cache *stateid_slab = NULL;
90static struct kmem_cache *deleg_slab = NULL;
e60d4398 91
1da177e4
LT		 92void
93nfs4_lock_state(void)
94{
353ab6e9 95 mutex_lock(&client_mutex);
1da177e4
LT		 96}
97
98void
99nfs4_unlock_state(void)
100{
353ab6e9 101 mutex_unlock(&client_mutex);
1da177e4
LT		 102}
103
104static inline u32
105opaque_hashval(const void *ptr, int nbytes)
106{
107 unsigned char *cptr = (unsigned char *) ptr;
108
109 u32 x = 0;
110 while (nbytes--) {
111 x *= 37;
112 x += *cptr++;
113 }
114 return x;
115}
116
117/* forward declarations */
118static void release_stateowner(struct nfs4_stateowner *sop);
119static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 120
121/*
122 * Delegation state
123 */
124
125/* recall_lock protects the del_recall_lru */
34af946a 126static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 127static struct list_head del_recall_lru;
128
13cd2184
N		 129static void
130free_nfs4_file(struct kref *kref)
131{
132 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
133 list_del(&fp->fi_hash);
134 iput(fp->fi_inode);
135 kmem_cache_free(file_slab, fp);
136}
137
138static inline void
139put_nfs4_file(struct nfs4_file *fi)
140{
141 kref_put(&fi->fi_ref, free_nfs4_file);
142}
143
144static inline void
145get_nfs4_file(struct nfs4_file *fi)
146{
147 kref_get(&fi->fi_ref);
148}
149
ef0f3390
N		 150static int num_delegations;
151
152/*
153 * Open owner state (share locks)
154 */
155
156/* hash tables for nfs4_stateowner */
157#define OWNER_HASH_BITS 8
158#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
159#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
160
161#define ownerid_hashval(id) \
162 ((id) & OWNER_HASH_MASK)
163#define ownerstr_hashval(clientid, ownername) \
164 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
165
166static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
167static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
168
169/* hash table for nfs4_file */
170#define FILE_HASH_BITS 8
171#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
172#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
173/* hash table for (open)nfs4_stateid */
174#define STATEID_HASH_BITS 10
175#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
176#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
177
178#define file_hashval(x) \
179 hash_ptr(x, FILE_HASH_BITS)
180#define stateid_hashval(owner_id, file_id) \
181 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
182
183static struct list_head file_hashtbl[FILE_HASH_SIZE];
184static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
185
1da177e4
LT		 186static struct nfs4_delegation *
187alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
188{
189 struct nfs4_delegation *dp;
190 struct nfs4_file *fp = stp->st_file;
191 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
192
193 dprintk("NFSD alloc_init_deleg\n");
ef0f3390
N		 194 if (num_delegations > STATEID_HASH_SIZE * 4)
195 return NULL;
5b2d21c1
N		 196 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
197 if (dp == NULL)
1da177e4 198 return dp;
ef0f3390 199 num_delegations++;
ea1da636
N		 200 INIT_LIST_HEAD(&dp->dl_perfile);
201 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 202 INIT_LIST_HEAD(&dp->dl_recall_lru);
203 dp->dl_client = clp;
13cd2184 204 get_nfs4_file(fp);
1da177e4
LT		 205 dp->dl_file = fp;
206 dp->dl_flock = NULL;
207 get_file(stp->st_vfs_file);
208 dp->dl_vfs_file = stp->st_vfs_file;
209 dp->dl_type = type;
210 dp->dl_recall.cbr_dp = NULL;
211 dp->dl_recall.cbr_ident = cb->cb_ident;
212 dp->dl_recall.cbr_trunc = 0;
213 dp->dl_stateid.si_boot = boot_time;
214 dp->dl_stateid.si_stateownerid = current_delegid++;
215 dp->dl_stateid.si_fileid = 0;
216 dp->dl_stateid.si_generation = 0;
217 dp->dl_fhlen = current_fh->fh_handle.fh_size;
218 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
219 current_fh->fh_handle.fh_size);
220 dp->dl_time = 0;
221 atomic_set(&dp->dl_count, 1);
ea1da636
N		 222 list_add(&dp->dl_perfile, &fp->fi_delegations);
223 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 224 return dp;
225}
226
227void
228nfs4_put_delegation(struct nfs4_delegation *dp)
229{
230 if (atomic_dec_and_test(&dp->dl_count)) {
231 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 232 put_nfs4_file(dp->dl_file);
5b2d21c1 233 kmem_cache_free(deleg_slab, dp);
ef0f3390 234 num_delegations--;
1da177e4
LT		 235 }
236}
237
238/* Remove the associated file_lock first, then remove the delegation.
239 * lease_modify() is called to remove the FS_LEASE file_lock from
240 * the i_flock list, eventually calling nfsd's lock_manager
241 * fl_release_callback.
242 */
243static void
244nfs4_close_delegation(struct nfs4_delegation *dp)
245{
246 struct file *filp = dp->dl_vfs_file;
247
248 dprintk("NFSD: close_delegation dp %p\n",dp);
249 dp->dl_vfs_file = NULL;
250 /* The following nfsd_close may not actually close the file,
251 * but we want to remove the lease in any case. */
c907132d
N		 252 if (dp->dl_flock)
253 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 254 nfsd_close(filp);
1da177e4
LT		 255}
256
257/* Called under the state lock. */
258static void
259unhash_delegation(struct nfs4_delegation *dp)
260{
ea1da636
N		 261 list_del_init(&dp->dl_perfile);
262 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 263 spin_lock(&recall_lock);
264 list_del_init(&dp->dl_recall_lru);
265 spin_unlock(&recall_lock);
266 nfs4_close_delegation(dp);
267 nfs4_put_delegation(dp);
268}
269
270/*
271 * SETCLIENTID state
272 */
273
274/* Hash tables for nfs4_clientid state */
275#define CLIENT_HASH_BITS 4
276#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
277#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
278
279#define clientid_hashval(id) \
280 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 281#define clientstr_hashval(name) \
282 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 283/*
284 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
285 * used in reboot/reset lease grace period processing
286 *
287 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
288 * setclientid_confirmed info.
289 *
290 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
291 * setclientid info.
292 *
293 * client_lru holds client queue ordered by nfs4_client.cl_time
294 * for lease renewal.
295 *
296 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
297 * for last close replay.
298 */
299static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
300static int reclaim_str_hashtbl_size = 0;
301static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
302static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
303static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
304static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
305static struct list_head client_lru;
306static struct list_head close_lru;
307
308static inline void
309renew_client(struct nfs4_client *clp)
310{
311 /*
312 * Move client to the end to the LRU list.
313 */
314 dprintk("renewing client (clientid %08x/%08x)\n",
315 clp->cl_clientid.cl_boot,
316 clp->cl_clientid.cl_id);
317 list_move_tail(&clp->cl_lru, &client_lru);
318 clp->cl_time = get_seconds();
319}
320
321/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
322static int
323STALE_CLIENTID(clientid_t *clid)
324{
325 if (clid->cl_boot == boot_time)
326 return 0;
327 dprintk("NFSD stale clientid (%08x/%08x)\n",
328 clid->cl_boot, clid->cl_id);
329 return 1;
330}
331
332/*
333 * XXX Should we use a slab cache ?
334 * This type of memory management is somewhat inefficient, but we use it
335 * anyway since SETCLIENTID is not a common operation.
336 */
337static inline struct nfs4_client *
338alloc_client(struct xdr_netobj name)
339{
340 struct nfs4_client *clp;
341
f8314dc6 342 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
1da177e4
LT		 343 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
344 memcpy(clp->cl_name.data, name.data, name.len);
345 clp->cl_name.len = name.len;
346 }
347 else {
348 kfree(clp);
349 clp = NULL;
350 }
351 }
352 return clp;
353}
354
355static inline void
356free_client(struct nfs4_client *clp)
357{
358 if (clp->cl_cred.cr_group_info)
359 put_group_info(clp->cl_cred.cr_group_info);
360 kfree(clp->cl_name.data);
361 kfree(clp);
362}
363
364void
365put_nfs4_client(struct nfs4_client *clp)
366{
367 if (atomic_dec_and_test(&clp->cl_count))
368 free_client(clp);
369}
370
4e2fd495
N		 371static void
372shutdown_callback_client(struct nfs4_client *clp)
373{
374 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
375
376 /* shutdown rpc client, ending any outstanding recall rpcs */
377 if (clnt) {
378 clp->cl_callback.cb_client = NULL;
379 rpc_shutdown_client(clnt);
380 rpciod_down();
381 }
382}
383
1da177e4
LT		 384static void
385expire_client(struct nfs4_client *clp)
386{
387 struct nfs4_stateowner *sop;
388 struct nfs4_delegation *dp;
1da177e4
LT		 389 struct list_head reaplist;
390
391 dprintk("NFSD: expire_client cl_count %d\n",
392 atomic_read(&clp->cl_count));
393
4e2fd495 394 shutdown_callback_client(clp);
1da177e4
LT		 395
396 INIT_LIST_HEAD(&reaplist);
397 spin_lock(&recall_lock);
ea1da636
N		 398 while (!list_empty(&clp->cl_delegations)) {
399 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 400 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
401 dp->dl_flock);
ea1da636 402 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 403 list_move(&dp->dl_recall_lru, &reaplist);
404 }
405 spin_unlock(&recall_lock);
406 while (!list_empty(&reaplist)) {
407 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
408 list_del_init(&dp->dl_recall_lru);
409 unhash_delegation(dp);
410 }
411 list_del(&clp->cl_idhash);
412 list_del(&clp->cl_strhash);
413 list_del(&clp->cl_lru);
ea1da636
N		 414 while (!list_empty(&clp->cl_openowners)) {
415 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 416 release_stateowner(sop);
417 }
418 put_nfs4_client(clp);
419}
420
421static struct nfs4_client *
a55370a3 422create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 423 struct nfs4_client *clp;
424
425 if (!(clp = alloc_client(name)))
426 goto out;
a55370a3 427 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 428 atomic_set(&clp->cl_count, 1);
429 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 430 INIT_LIST_HEAD(&clp->cl_idhash);
431 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 432 INIT_LIST_HEAD(&clp->cl_openowners);
433 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 434 INIT_LIST_HEAD(&clp->cl_lru);
435out:
436 return clp;
437}
438
439static void
440copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
441 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
442}
443
444static void
445copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
446 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
447 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
448}
449
450static void
451copy_cred(struct svc_cred *target, struct svc_cred *source) {
452
453 target->cr_uid = source->cr_uid;
454 target->cr_gid = source->cr_gid;
455 target->cr_group_info = source->cr_group_info;
456 get_group_info(target->cr_group_info);
457}
458
a55370a3
N		 459static inline int
460same_name(const char *n1, const char *n2) {
461 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 462}
463
464static int
465cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
466 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
467}
468
469static int
470cmp_clid(clientid_t * cl1, clientid_t * cl2) {
471 return((cl1->cl_boot == cl2->cl_boot) &&
472 (cl1->cl_id == cl2->cl_id));
473}
474
475/* XXX what about NGROUP */
476static int
477cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
478 return(cr1->cr_uid == cr2->cr_uid);
479
480}
481
482static void
483gen_clid(struct nfs4_client *clp) {
484 clp->cl_clientid.cl_boot = boot_time;
485 clp->cl_clientid.cl_id = current_clientid++;
486}
487
488static void
489gen_confirm(struct nfs4_client *clp) {
490 struct timespec tv;
491 u32 * p;
492
493 tv = CURRENT_TIME;
494 p = (u32 *)clp->cl_confirm.data;
495 *p++ = tv.tv_sec;
496 *p++ = tv.tv_nsec;
497}
498
499static int
500check_name(struct xdr_netobj name) {
501
502 if (name.len == 0)
503 return 0;
504 if (name.len > NFS4_OPAQUE_LIMIT) {
505 printk("NFSD: check_name: name too long(%d)!\n", name.len);
506 return 0;
507 }
508 return 1;
509}
510
fd39ca9a 511static void
1da177e4
LT		 512add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
513{
514 unsigned int idhashval;
515
516 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
517 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
518 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
519 list_add_tail(&clp->cl_lru, &client_lru);
520 clp->cl_time = get_seconds();
521}
522
fd39ca9a 523static void
1da177e4
LT		 524move_to_confirmed(struct nfs4_client *clp)
525{
526 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
527 unsigned int strhashval;
528
529 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
530 list_del_init(&clp->cl_strhash);
f116629d 531 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 532 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 533 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
534 renew_client(clp);
535}
536
537static struct nfs4_client *
538find_confirmed_client(clientid_t *clid)
539{
540 struct nfs4_client *clp;
541 unsigned int idhashval = clientid_hashval(clid->cl_id);
542
543 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
544 if (cmp_clid(&clp->cl_clientid, clid))
545 return clp;
546 }
547 return NULL;
548}
549
550static struct nfs4_client *
551find_unconfirmed_client(clientid_t *clid)
552{
553 struct nfs4_client *clp;
554 unsigned int idhashval = clientid_hashval(clid->cl_id);
555
556 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
557 if (cmp_clid(&clp->cl_clientid, clid))
558 return clp;
559 }
560 return NULL;
561}
562
28ce6054
N		 563static struct nfs4_client *
564find_confirmed_client_by_str(const char *dname, unsigned int hashval)
565{
566 struct nfs4_client *clp;
567
568 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
569 if (same_name(clp->cl_recdir, dname))
570 return clp;
571 }
572 return NULL;
573}
574
575static struct nfs4_client *
576find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
577{
578 struct nfs4_client *clp;
579
580 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
581 if (same_name(clp->cl_recdir, dname))
582 return clp;
583 }
584 return NULL;
585}
586
1da177e4
LT		 587/* a helper function for parse_callback */
588static int
589parse_octet(unsigned int *lenp, char **addrp)
590{
591 unsigned int len = *lenp;
592 char *p = *addrp;
593 int n = -1;
594 char c;
595
596 for (;;) {
597 if (!len)
598 break;
599 len--;
600 c = *p++;
601 if (c == '.')
602 break;
603 if ((c < '0') || (c > '9')) {
604 n = -1;
605 break;
606 }
607 if (n < 0)
608 n = 0;
609 n = (n * 10) + (c - '0');
610 if (n > 255) {
611 n = -1;
612 break;
613 }
614 }
615 *lenp = len;
616 *addrp = p;
617 return n;
618}
619
620/* parse and set the setclientid ipv4 callback address */
fd39ca9a 621static int
1da177e4
LT		 622parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
623{
624 int temp = 0;
625 u32 cbaddr = 0;
626 u16 cbport = 0;
627 u32 addrlen = addr_len;
628 char *addr = addr_val;
629 int i, shift;
630
631 /* ipaddress */
632 shift = 24;
633 for(i = 4; i > 0 ; i--) {
634 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
635 return 0;
636 }
637 cbaddr |= (temp << shift);
638 if (shift > 0)
639 shift -= 8;
640 }
641 *cbaddrp = cbaddr;
642
643 /* port */
644 shift = 8;
645 for(i = 2; i > 0 ; i--) {
646 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
647 return 0;
648 }
649 cbport |= (temp << shift);
650 if (shift > 0)
651 shift -= 8;
652 }
653 *cbportp = cbport;
654 return 1;
655}
656
fd39ca9a 657static void
1da177e4
LT		 658gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
659{
660 struct nfs4_callback *cb = &clp->cl_callback;
661
662 /* Currently, we only support tcp for the callback channel */
663 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
664 goto out_err;
665
666 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
667 &cb->cb_addr, &cb->cb_port)))
668 goto out_err;
669 cb->cb_prog = se->se_callback_prog;
670 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 671 return;
672out_err:
849823c5 673 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 674 "will not receive delegations\n",
675 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
676
1da177e4
LT		 677 return;
678}
679
680/*
681 * RFC 3010 has a complex implmentation description of processing a
682 * SETCLIENTID request consisting of 5 bullets, labeled as
683 * CASE0 - CASE4 below.
684 *
685 * NOTES:
686 * callback information will be processed in a future patch
687 *
688 * an unconfirmed record is added when:
689 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
690 * CASE 1: confirmed record found with matching name, principal,
691 * verifier, and clientid.
692 * CASE 2: confirmed record found with matching name, principal,
693 * and there is no unconfirmed record with matching
694 * name and principal
695 *
696 * an unconfirmed record is replaced when:
697 * CASE 3: confirmed record found with matching name, principal,
698 * and an unconfirmed record is found with matching
699 * name, principal, and with clientid and
700 * confirm that does not match the confirmed record.
701 * CASE 4: there is no confirmed record with matching name and
702 * principal. there is an unconfirmed record with
703 * matching name, principal.
704 *
705 * an unconfirmed record is deleted when:
706 * CASE 1: an unconfirmed record that matches input name, verifier,
707 * and confirmed clientid.
708 * CASE 4: any unconfirmed records with matching name and principal
709 * that exist after an unconfirmed record has been replaced
710 * as described above.
711 *
712 */
b37ad28b 713__be32
b591480b
BF		 714nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
715 struct nfsd4_setclientid *setclid)
1da177e4 716{
c7afef1f 717 __be32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
1da177e4
LT		 718 struct xdr_netobj clname = {
719 .len = setclid->se_namelen,
720 .data = setclid->se_name,
721 };
722 nfs4_verifier clverifier = setclid->se_verf;
723 unsigned int strhashval;
28ce6054 724 struct nfs4_client *conf, *unconf, *new;
b37ad28b 725 __be32 status;
a55370a3 726 char dname[HEXDIR_LEN];
1da177e4 727
1da177e4 728 if (!check_name(clname))
73aea4ec 729 return nfserr_inval;
1da177e4 730
a55370a3
N		 731 status = nfs4_make_rec_clidname(dname, &clname);
732 if (status)
73aea4ec 733 return status;
a55370a3 734
1da177e4
LT		 735 /*
736 * XXX The Duplicate Request Cache (DRC) has been checked (??)
737 * We get here on a DRC miss.
738 */
739
a55370a3 740 strhashval = clientstr_hashval(dname);
1da177e4 741
1da177e4 742 nfs4_lock_state();
28ce6054
N		 743 conf = find_confirmed_client_by_str(dname, strhashval);
744 if (conf) {
1da177e4
LT		 745 /*
746 * CASE 0:
747 * clname match, confirmed, different principal
748 * or different ip_address
749 */
750 status = nfserr_clid_inuse;
28ce6054
N		 751 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
752 || conf->cl_addr != ip_addr) {
1da177e4
LT		 753 printk("NFSD: setclientid: string in use by client"
754 "(clientid %08x/%08x)\n",
28ce6054 755 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 756 goto out;
757 }
1da177e4 758 }
28ce6054 759 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 760 status = nfserr_resource;
761 if (!conf) {
762 /*
763 * CASE 4:
764 * placed first, because it is the normal case.
765 */
766 if (unconf)
767 expire_client(unconf);
a55370a3
N		 768 new = create_client(clname, dname);
769 if (new == NULL)
1da177e4
LT		 770 goto out;
771 copy_verf(new, &clverifier);
772 new->cl_addr = ip_addr;
773 copy_cred(&new->cl_cred,&rqstp->rq_cred);
774 gen_clid(new);
775 gen_confirm(new);
776 gen_callback(new, setclid);
777 add_to_unconfirmed(new, strhashval);
778 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
779 /*
780 * CASE 1:
781 * cl_name match, confirmed, principal match
782 * verifier match: probable callback update
783 *
784 * remove any unconfirmed nfs4_client with
785 * matching cl_name, cl_verifier, and cl_clientid
786 *
787 * create and insert an unconfirmed nfs4_client with same
788 * cl_name, cl_verifier, and cl_clientid as existing
789 * nfs4_client, but with the new callback info and a
790 * new cl_confirm
791 */
31f4a6c1
N		 792 if (unconf) {
793 /* Note this is removing unconfirmed {*x***},
794 * which is stronger than RFC recommended {vxc**}.
795 * This has the advantage that there is at most
796 * one {*x***} in either list at any time.
797 */
798 expire_client(unconf);
1da177e4 799 }
a55370a3
N		 800 new = create_client(clname, dname);
801 if (new == NULL)
1da177e4
LT		 802 goto out;
803 copy_verf(new,&conf->cl_verifier);
804 new->cl_addr = ip_addr;
805 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806 copy_clid(new, conf);
807 gen_confirm(new);
808 gen_callback(new, setclid);
809 add_to_unconfirmed(new,strhashval);
810 } else if (!unconf) {
811 /*
812 * CASE 2:
813 * clname match, confirmed, principal match
814 * verfier does not match
815 * no unconfirmed. create a new unconfirmed nfs4_client
816 * using input clverifier, clname, and callback info
817 * and generate a new cl_clientid and cl_confirm.
818 */
a55370a3
N		 819 new = create_client(clname, dname);
820 if (new == NULL)
1da177e4
LT		 821 goto out;
822 copy_verf(new,&clverifier);
823 new->cl_addr = ip_addr;
824 copy_cred(&new->cl_cred,&rqstp->rq_cred);
825 gen_clid(new);
826 gen_confirm(new);
827 gen_callback(new, setclid);
828 add_to_unconfirmed(new, strhashval);
829 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
830 /*
831 * CASE3:
832 * confirmed found (name, principal match)
833 * confirmed verifier does not match input clverifier
834 *
835 * unconfirmed found (name match)
836 * confirmed->cl_confirm != unconfirmed->cl_confirm
837 *
838 * remove unconfirmed.
839 *
840 * create an unconfirmed nfs4_client
841 * with same cl_name as existing confirmed nfs4_client,
842 * but with new callback info, new cl_clientid,
843 * new cl_verifier and a new cl_confirm
844 */
845 expire_client(unconf);
a55370a3
N		 846 new = create_client(clname, dname);
847 if (new == NULL)
1da177e4
LT		 848 goto out;
849 copy_verf(new,&clverifier);
850 new->cl_addr = ip_addr;
851 copy_cred(&new->cl_cred,&rqstp->rq_cred);
852 gen_clid(new);
853 gen_confirm(new);
854 gen_callback(new, setclid);
855 add_to_unconfirmed(new, strhashval);
856 } else {
857 /* No cases hit !!! */
858 status = nfserr_inval;
859 goto out;
860
861 }
862 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
863 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
864 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
865 status = nfs_ok;
866out:
867 nfs4_unlock_state();
868 return status;
869}
870
871
872/*
873 * RFC 3010 has a complex implmentation description of processing a
874 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
875 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
876 *
877 * NOTE: callback information will be processed here in a future patch
878 */
b37ad28b 879__be32
b591480b
BF		 880nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
881 struct nfsd4_compound_state *cstate,
882 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 883{
c7afef1f 884 __be32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
21ab45a4 885 struct nfs4_client *conf, *unconf;
1da177e4
LT		 886 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
887 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 888 __be32 status;
1da177e4
LT		 889
890 if (STALE_CLIENTID(clid))
891 return nfserr_stale_clientid;
892 /*
893 * XXX The Duplicate Request Cache (DRC) has been checked (??)
894 * We get here on a DRC miss.
895 */
896
897 nfs4_lock_state();
21ab45a4
N		 898
899 conf = find_confirmed_client(clid);
900 unconf = find_unconfirmed_client(clid);
901
902 status = nfserr_clid_inuse;
903 if (conf && conf->cl_addr != ip_addr)
904 goto out;
905 if (unconf && unconf->cl_addr != ip_addr)
906 goto out;
907
1da177e4
LT		 908 if ((conf && unconf) &&
909 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
910 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 911 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 912 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 913 /* CASE 1:
914 * unconf record that matches input clientid and input confirm.
915 * conf record that matches input clientid.
916 * conf and unconf records match names, verifiers
917 */
1da177e4
LT		 918 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
919 status = nfserr_clid_inuse;
920 else {
1a69c179
N		 921 /* XXX: We just turn off callbacks until we can handle
922 * change request correctly. */
cb36d634 923 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 924 gen_confirm(conf);
46309029 925 nfsd4_remove_clid_dir(unconf);
1a69c179 926 expire_client(unconf);
1da177e4 927 status = nfs_ok;
1a69c179 928
1da177e4 929 }
7c79f737 930 } else if ((conf && !unconf) ||
1da177e4
LT		 931 ((conf && unconf) &&
932 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 933 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 934 /* CASE 2:
935 * conf record that matches input clientid.
936 * if unconf record matches input clientid, then
937 * unconf->cl_name or unconf->cl_verifier don't match the
938 * conf record.
939 */
21ab45a4 940 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 941 status = nfserr_clid_inuse;
21ab45a4 942 else
1da177e4 943 status = nfs_ok;
7c79f737
N		 944 } else if (!conf && unconf
945 && cmp_verf(&unconf->cl_confirm, &confirm)) {
946 /* CASE 3:
947 * conf record not found.
948 * unconf record found.
949 * unconf->cl_confirm matches input confirm
950 */
1da177e4
LT		 951 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
952 status = nfserr_clid_inuse;
953 } else {
1a69c179
N		 954 unsigned int hash =
955 clientstr_hashval(unconf->cl_recdir);
956 conf = find_confirmed_client_by_str(unconf->cl_recdir,
957 hash);
958 if (conf) {
c7b9a459 959 nfsd4_remove_clid_dir(conf);
1a69c179
N		 960 expire_client(conf);
961 }
1da177e4 962 move_to_confirmed(unconf);
21ab45a4 963 conf = unconf;
1a69c179 964 status = nfs_ok;
1da177e4 965 }
7c79f737
N		 966 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
967 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
968 &confirm)))) {
969 /* CASE 4:
970 * conf record not found, or if conf, conf->cl_confirm does not
971 * match input confirm.
972 * unconf record not found, or if unconf, unconf->cl_confirm
973 * does not match input confirm.
974 */
1da177e4 975 status = nfserr_stale_clientid;
7c79f737 976 } else {
08e8987c
N		 977 /* check that we have hit one of the cases...*/
978 status = nfserr_clid_inuse;
979 }
1da177e4
LT		 980out:
981 if (!status)
21ab45a4 982 nfsd4_probe_callback(conf);
1da177e4
LT		 983 nfs4_unlock_state();
984 return status;
985}
986
1da177e4
LT		 987/* OPEN Share state helper functions */
988static inline struct nfs4_file *
989alloc_init_file(struct inode *ino)
990{
991 struct nfs4_file *fp;
992 unsigned int hashval = file_hashval(ino);
993
e60d4398
N		 994 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
995 if (fp) {
13cd2184 996 kref_init(&fp->fi_ref);
1da177e4 997 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 998 INIT_LIST_HEAD(&fp->fi_stateids);
999 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1000 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1001 fp->fi_inode = igrab(ino);
1002 fp->fi_id = current_fileid++;
1da177e4
LT		 1003 return fp;
1004 }
1005 return NULL;
1006}
1007
e60d4398 1008static void
e18b890b 1009nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1010{
e60d4398
N		 1011 if (*slab == NULL)
1012 return;
1a1d92c1 1013 kmem_cache_destroy(*slab);
e60d4398 1014 *slab = NULL;
1da177e4
LT		 1015}
1016
1017static void
1018nfsd4_free_slabs(void)
1019{
e60d4398
N		 1020 nfsd4_free_slab(&stateowner_slab);
1021 nfsd4_free_slab(&file_slab);
5ac049ac 1022 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1023 nfsd4_free_slab(&deleg_slab);
e60d4398 1024}
1da177e4 1025
e60d4398
N		 1026static int
1027nfsd4_init_slabs(void)
1028{
1029 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1030 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1031 if (stateowner_slab == NULL)
1032 goto out_nomem;
1033 file_slab = kmem_cache_create("nfsd4_files",
1034 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1035 if (file_slab == NULL)
1036 goto out_nomem;
5ac049ac
N		 1037 stateid_slab = kmem_cache_create("nfsd4_stateids",
1038 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1039 if (stateid_slab == NULL)
1040 goto out_nomem;
5b2d21c1
N		 1041 deleg_slab = kmem_cache_create("nfsd4_delegations",
1042 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1043 if (deleg_slab == NULL)
1044 goto out_nomem;
e60d4398
N		 1045 return 0;
1046out_nomem:
1047 nfsd4_free_slabs();
1048 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1049 return -ENOMEM;
1da177e4
LT		 1050}
1051
1052void
1053nfs4_free_stateowner(struct kref *kref)
1054{
1055 struct nfs4_stateowner *sop =
1056 container_of(kref, struct nfs4_stateowner, so_ref);
1057 kfree(sop->so_owner.data);
1058 kmem_cache_free(stateowner_slab, sop);
1059}
1060
1061static inline struct nfs4_stateowner *
1062alloc_stateowner(struct xdr_netobj *owner)
1063{
1064 struct nfs4_stateowner *sop;
1065
1066 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1067 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1068 memcpy(sop->so_owner.data, owner->data, owner->len);
1069 sop->so_owner.len = owner->len;
1070 kref_init(&sop->so_ref);
1071 return sop;
1072 }
1073 kmem_cache_free(stateowner_slab, sop);
1074 }
1075 return NULL;
1076}
1077
1078static struct nfs4_stateowner *
1079alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1080 struct nfs4_stateowner *sop;
1081 struct nfs4_replay *rp;
1082 unsigned int idhashval;
1083
1084 if (!(sop = alloc_stateowner(&open->op_owner)))
1085 return NULL;
1086 idhashval = ownerid_hashval(current_ownerid);
1087 INIT_LIST_HEAD(&sop->so_idhash);
1088 INIT_LIST_HEAD(&sop->so_strhash);
1089 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1090 INIT_LIST_HEAD(&sop->so_stateids);
1091 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1092 INIT_LIST_HEAD(&sop->so_close_lru);
1093 sop->so_time = 0;
1094 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1095 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1096 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1097 sop->so_is_open_owner = 1;
1098 sop->so_id = current_ownerid++;
1099 sop->so_client = clp;
1100 sop->so_seqid = open->op_seqid;
1101 sop->so_confirmed = 0;
1102 rp = &sop->so_replay;
de1ae286 1103 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1104 rp->rp_buflen = 0;
1105 rp->rp_buf = rp->rp_ibuf;
1106 return sop;
1107}
1108
1109static void
1110release_stateid_lockowners(struct nfs4_stateid *open_stp)
1111{
1112 struct nfs4_stateowner *lock_sop;
1113
ea1da636
N		 1114 while (!list_empty(&open_stp->st_lockowners)) {
1115 lock_sop = list_entry(open_stp->st_lockowners.next,
1116 struct nfs4_stateowner, so_perstateid);
1117 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1118 BUG_ON(lock_sop->so_is_open_owner);
1119 release_stateowner(lock_sop);
1120 }
1121}
1122
1123static void
1124unhash_stateowner(struct nfs4_stateowner *sop)
1125{
1126 struct nfs4_stateid *stp;
1127
1128 list_del(&sop->so_idhash);
1129 list_del(&sop->so_strhash);
6fa305de 1130 if (sop->so_is_open_owner)
1da177e4 1131 list_del(&sop->so_perclient);
ea1da636
N		 1132 list_del(&sop->so_perstateid);
1133 while (!list_empty(&sop->so_stateids)) {
1134 stp = list_entry(sop->so_stateids.next,
1135 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1136 if (sop->so_is_open_owner)
1137 release_stateid(stp, OPEN_STATE);
1138 else
1139 release_stateid(stp, LOCK_STATE);
1140 }
1141}
1142
1143static void
1144release_stateowner(struct nfs4_stateowner *sop)
1145{
1146 unhash_stateowner(sop);
1147 list_del(&sop->so_close_lru);
1148 nfs4_put_stateowner(sop);
1149}
1150
1151static inline void
1152init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1153 struct nfs4_stateowner *sop = open->op_stateowner;
1154 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1155
1156 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1157 INIT_LIST_HEAD(&stp->st_perstateowner);
1158 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1159 INIT_LIST_HEAD(&stp->st_perfile);
1160 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1161 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1162 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1163 stp->st_stateowner = sop;
13cd2184 1164 get_nfs4_file(fp);
1da177e4
LT		 1165 stp->st_file = fp;
1166 stp->st_stateid.si_boot = boot_time;
1167 stp->st_stateid.si_stateownerid = sop->so_id;
1168 stp->st_stateid.si_fileid = fp->fi_id;
1169 stp->st_stateid.si_generation = 0;
1170 stp->st_access_bmap = 0;
1171 stp->st_deny_bmap = 0;
1172 __set_bit(open->op_share_access, &stp->st_access_bmap);
1173 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1174 stp->st_openstp = NULL;
1da177e4
LT		 1175}
1176
1177static void
1178release_stateid(struct nfs4_stateid *stp, int flags)
1179{
1180 struct file *filp = stp->st_vfs_file;
1181
1182 list_del(&stp->st_hash);
1da177e4 1183 list_del(&stp->st_perfile);
ea1da636 1184 list_del(&stp->st_perstateowner);
1da177e4
LT		 1185 if (flags & OPEN_STATE) {
1186 release_stateid_lockowners(stp);
1187 stp->st_vfs_file = NULL;
1188 nfsd_close(filp);
1da177e4
LT		 1189 } else if (flags & LOCK_STATE)
1190 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1191 put_nfs4_file(stp->st_file);
5ac049ac 1192 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1193}
1194
fd39ca9a 1195static void
1da177e4
LT		 1196move_to_close_lru(struct nfs4_stateowner *sop)
1197{
1198 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1199
358dd55a 1200 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1201 sop->so_time = get_seconds();
1202}
1203
1da177e4
LT		 1204static int
1205cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1206 return ((sop->so_owner.len == owner->len) &&
1207 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1208 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1209}
1210
1211static struct nfs4_stateowner *
1212find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1213{
1214 struct nfs4_stateowner *so = NULL;
1215
1216 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1217 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1218 return so;
1219 }
1220 return NULL;
1221}
1222
1223/* search file_hashtbl[] for file */
1224static struct nfs4_file *
1225find_file(struct inode *ino)
1226{
1227 unsigned int hashval = file_hashval(ino);
1228 struct nfs4_file *fp;
1229
1230 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1231 if (fp->fi_inode == ino) {
1232 get_nfs4_file(fp);
1da177e4 1233 return fp;
13cd2184 1234 }
1da177e4
LT		 1235 }
1236 return NULL;
1237}
1238
ba5a6a19
BF		 1239static int access_valid(u32 x)
1240{
1241 return (x > 0 && x < 4);
1242}
1243
1244static int deny_valid(u32 x)
1245{
1246 return (x >= 0 && x < 5);
1247}
1da177e4 1248
fd39ca9a 1249static void
1da177e4
LT		 1250set_access(unsigned int *access, unsigned long bmap) {
1251 int i;
1252
1253 *access = 0;
1254 for (i = 1; i < 4; i++) {
1255 if (test_bit(i, &bmap))
1256 *access |= i;
1257 }
1258}
1259
fd39ca9a 1260static void
1da177e4
LT		 1261set_deny(unsigned int *deny, unsigned long bmap) {
1262 int i;
1263
1264 *deny = 0;
1265 for (i = 0; i < 4; i++) {
1266 if (test_bit(i, &bmap))
1267 *deny |= i ;
1268 }
1269}
1270
1271static int
1272test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1273 unsigned int access, deny;
1274
1275 set_access(&access, stp->st_access_bmap);
1276 set_deny(&deny, stp->st_deny_bmap);
1277 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1278 return 0;
1279 return 1;
1280}
1281
1282/*
1283 * Called to check deny when READ with all zero stateid or
1284 * WRITE with all zero or all one stateid
1285 */
b37ad28b 1286static __be32
1da177e4
LT		 1287nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1288{
1289 struct inode *ino = current_fh->fh_dentry->d_inode;
1290 struct nfs4_file *fp;
1291 struct nfs4_stateid *stp;
b37ad28b 1292 __be32 ret;
1da177e4
LT		 1293
1294 dprintk("NFSD: nfs4_share_conflict\n");
1295
1296 fp = find_file(ino);
13cd2184
N		 1297 if (!fp)
1298 return nfs_ok;
b700949b 1299 ret = nfserr_locked;
1da177e4 1300 /* Search for conflicting share reservations */
13cd2184
N		 1301 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1302 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1303 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1304 goto out;
1da177e4 1305 }
13cd2184
N		 1306 ret = nfs_ok;
1307out:
1308 put_nfs4_file(fp);
1309 return ret;
1da177e4
LT		 1310}
1311
1312static inline void
1313nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1314{
1315 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1316 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1317 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1318 }
1319}
1320
1321/*
1322 * Recall a delegation
1323 */
1324static int
1325do_recall(void *__dp)
1326{
1327 struct nfs4_delegation *dp = __dp;
1328
1329 daemonize("nfsv4-recall");
1330
1331 nfsd4_cb_recall(dp);
1332 return 0;
1333}
1334
1335/*
1336 * Spawn a thread to perform a recall on the delegation represented
1337 * by the lease (file_lock)
1338 *
1339 * Called from break_lease() with lock_kernel() held.
1340 * Note: we assume break_lease will only call this *once* for any given
1341 * lease.
1342 */
1343static
1344void nfsd_break_deleg_cb(struct file_lock *fl)
1345{
1346 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1347 struct task_struct *t;
1348
1349 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1350 if (!dp)
1351 return;
1352
1353 /* We're assuming the state code never drops its reference
1354 * without first removing the lease. Since we're in this lease
1355 * callback (and since the lease code is serialized by the kernel
1356 * lock) we know the server hasn't removed the lease yet, we know
1357 * it's safe to take a reference: */
1358 atomic_inc(&dp->dl_count);
1359
1360 spin_lock(&recall_lock);
1361 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1362 spin_unlock(&recall_lock);
1363
1364 /* only place dl_time is set. protected by lock_kernel*/
1365 dp->dl_time = get_seconds();
1366
1367 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1368 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1369
1370 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1371 if (IS_ERR(t)) {
1372 struct nfs4_client *clp = dp->dl_client;
1373
1374 printk(KERN_INFO "NFSD: Callback thread failed for "
1375 "for client (clientid %08x/%08x)\n",
1376 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1377 nfs4_put_delegation(dp);
1378 }
1379}
1380
1381/*
1382 * The file_lock is being reapd.
1383 *
1384 * Called by locks_free_lock() with lock_kernel() held.
1385 */
1386static
1387void nfsd_release_deleg_cb(struct file_lock *fl)
1388{
1389 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1390
1391 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1392
1393 if (!(fl->fl_flags & FL_LEASE) || !dp)
1394 return;
1395 dp->dl_flock = NULL;
1396}
1397
1398/*
1399 * Set the delegation file_lock back pointer.
1400 *
1401 * Called from __setlease() with lock_kernel() held.
1402 */
1403static
1404void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1405{
1406 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1407
1408 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1409 if (!dp)
1410 return;
1411 dp->dl_flock = new;
1412}
1413
1414/*
1415 * Called from __setlease() with lock_kernel() held
1416 */
1417static
1418int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1419{
1420 struct nfs4_delegation *onlistd =
1421 (struct nfs4_delegation *)onlist->fl_owner;
1422 struct nfs4_delegation *tryd =
1423 (struct nfs4_delegation *)try->fl_owner;
1424
1425 if (onlist->fl_lmops != try->fl_lmops)
1426 return 0;
1427
1428 return onlistd->dl_client == tryd->dl_client;
1429}
1430
1431
1432static
1433int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1434{
1435 if (arg & F_UNLCK)
1436 return lease_modify(onlist, arg);
1437 else
1438 return -EAGAIN;
1439}
1440
fd39ca9a 1441static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1442 .fl_break = nfsd_break_deleg_cb,
1443 .fl_release_private = nfsd_release_deleg_cb,
1444 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1445 .fl_mylease = nfsd_same_client_deleg_cb,
1446 .fl_change = nfsd_change_deleg_cb,
1447};
1448
1449
b37ad28b 1450__be32
1da177e4
LT		 1451nfsd4_process_open1(struct nfsd4_open *open)
1452{
1da177e4
LT		 1453 clientid_t *clientid = &open->op_clientid;
1454 struct nfs4_client *clp = NULL;
1455 unsigned int strhashval;
1456 struct nfs4_stateowner *sop = NULL;
1457
1da177e4 1458 if (!check_name(open->op_owner))
0f442aa2 1459 return nfserr_inval;
1da177e4
LT		 1460
1461 if (STALE_CLIENTID(&open->op_clientid))
1462 return nfserr_stale_clientid;
1463
1464 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1465 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1466 open->op_stateowner = sop;
1467 if (!sop) {
1468 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1469 clp = find_confirmed_client(clientid);
1470 if (clp == NULL)
0f442aa2
BF		 1471 return nfserr_expired;
1472 goto renew;
1da177e4 1473 }
0f442aa2
BF		 1474 if (!sop->so_confirmed) {
1475 /* Replace unconfirmed owners without checking for replay. */
1476 clp = sop->so_client;
1477 release_stateowner(sop);
1478 open->op_stateowner = NULL;
1479 goto renew;
1480 }
1481 if (open->op_seqid == sop->so_seqid - 1) {
1482 if (sop->so_replay.rp_buflen)
a90b061c 1483 return nfserr_replay_me;
0f442aa2
BF		 1484 /* The original OPEN failed so spectacularly
1485 * that we don't even have replay data saved!
1486 * Therefore, we have no choice but to continue
1487 * processing this OPEN; presumably, we'll
1488 * fail again for the same reason.
1489 */
1490 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1491 goto renew;
1492 }
1493 if (open->op_seqid != sop->so_seqid)
1494 return nfserr_bad_seqid;
1da177e4 1495renew:
0f442aa2
BF		 1496 if (open->op_stateowner == NULL) {
1497 sop = alloc_init_open_stateowner(strhashval, clp, open);
1498 if (sop == NULL)
1499 return nfserr_resource;
1500 open->op_stateowner = sop;
1501 }
1502 list_del_init(&sop->so_close_lru);
1da177e4 1503 renew_client(sop->so_client);
0f442aa2 1504 return nfs_ok;
1da177e4
LT		 1505}
1506
b37ad28b 1507static inline __be32
4a6e43e6
N		 1508nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1509{
1510 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1511 return nfserr_openmode;
1512 else
1513 return nfs_ok;
1514}
1515
52f4fb43
N		 1516static struct nfs4_delegation *
1517find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1518{
1519 struct nfs4_delegation *dp;
1520
ea1da636 1521 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1522 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1523 return dp;
1524 }
1525 return NULL;
1526}
1527
b37ad28b 1528static __be32
567d9829
N		 1529nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1530 struct nfs4_delegation **dp)
1531{
1532 int flags;
b37ad28b 1533 __be32 status = nfserr_bad_stateid;
567d9829
N		 1534
1535 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1536 if (*dp == NULL)
c44c5eeb 1537 goto out;
567d9829
N		 1538 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1539 RD_STATE : WR_STATE;
1540 status = nfs4_check_delegmode(*dp, flags);
1541 if (status)
1542 *dp = NULL;
c44c5eeb
N		 1543out:
1544 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1545 return nfs_ok;
1546 if (status)
1547 return status;
1548 open->op_stateowner->so_confirmed = 1;
1549 return nfs_ok;
567d9829
N		 1550}
1551
b37ad28b 1552static __be32
1da177e4
LT		 1553nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1554{
1555 struct nfs4_stateid *local;
b37ad28b 1556 __be32 status = nfserr_share_denied;
1da177e4
LT		 1557 struct nfs4_stateowner *sop = open->op_stateowner;
1558
8beefa24 1559 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1560 /* ignore lock owners */
1561 if (local->st_stateowner->so_is_open_owner == 0)
1562 continue;
1563 /* remember if we have seen this open owner */
1564 if (local->st_stateowner == sop)
1565 *stpp = local;
1566 /* check for conflicting share reservations */
1567 if (!test_share(local, open))
1568 goto out;
1569 }
1570 status = 0;
1571out:
1572 return status;
1573}
1574
5ac049ac
N		 1575static inline struct nfs4_stateid *
1576nfs4_alloc_stateid(void)
1577{
1578 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1579}
1580
b37ad28b 1581static __be32
1da177e4 1582nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1583 struct nfs4_delegation *dp,
1da177e4
LT		 1584 struct svc_fh *cur_fh, int flags)
1585{
1586 struct nfs4_stateid *stp;
1da177e4 1587
5ac049ac 1588 stp = nfs4_alloc_stateid();
1da177e4
LT		 1589 if (stp == NULL)
1590 return nfserr_resource;
1591
567d9829
N		 1592 if (dp) {
1593 get_file(dp->dl_vfs_file);
1594 stp->st_vfs_file = dp->dl_vfs_file;
1595 } else {
b37ad28b 1596 __be32 status;
567d9829
N		 1597 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1598 &stp->st_vfs_file);
1599 if (status) {
1600 if (status == nfserr_dropit)
1601 status = nfserr_jukebox;
5ac049ac 1602 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1603 return status;
1604 }
1da177e4 1605 }
1da177e4
LT		 1606 *stpp = stp;
1607 return 0;
1608}
1609
b37ad28b 1610static inline __be32
1da177e4
LT		 1611nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1612 struct nfsd4_open *open)
1613{
1614 struct iattr iattr = {
1615 .ia_valid = ATTR_SIZE,
1616 .ia_size = 0,
1617 };
1618 if (!open->op_truncate)
1619 return 0;
1620 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1621 return nfserr_inval;
1da177e4
LT		 1622 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1623}
1624
b37ad28b 1625static __be32
1da177e4
LT		 1626nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1627{
1628 struct file *filp = stp->st_vfs_file;
7eaa36e2 1629 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1630 unsigned int share_access, new_writer;
b37ad28b 1631 __be32 status;
1da177e4
LT		 1632
1633 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1634 new_writer = (~share_access) & open->op_share_access
1635 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1636
6c26d08f 1637 if (new_writer) {
b37ad28b
AV		 1638 int err = get_write_access(inode);
1639 if (err)
1640 return nfserrno(err);
6c26d08f 1641 }
1da177e4
LT		 1642 status = nfsd4_truncate(rqstp, cur_fh, open);
1643 if (status) {
6c26d08f
BF		 1644 if (new_writer)
1645 put_write_access(inode);
1da177e4
LT		 1646 return status;
1647 }
1648 /* remember the open */
6c26d08f 1649 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1650 set_bit(open->op_share_access, &stp->st_access_bmap);
1651 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1652
1653 return nfs_ok;
1654}
1655
1656
1da177e4 1657static void
37515177 1658nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1659{
37515177
N		 1660 open->op_stateowner->so_confirmed = 1;
1661 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1662}
1663
1664/*
1665 * Attempt to hand out a delegation.
1666 */
1667static void
1668nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1669{
1670 struct nfs4_delegation *dp;
1671 struct nfs4_stateowner *sop = stp->st_stateowner;
1672 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1673 struct file_lock fl, *flp = &fl;
1674 int status, flag = 0;
1675
1676 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1677 open->op_recall = 0;
1678 switch (open->op_claim_type) {
1679 case NFS4_OPEN_CLAIM_PREVIOUS:
1680 if (!atomic_read(&cb->cb_set))
1681 open->op_recall = 1;
1682 flag = open->op_delegate_type;
1683 if (flag == NFS4_OPEN_DELEGATE_NONE)
1684 goto out;
1685 break;
1686 case NFS4_OPEN_CLAIM_NULL:
1687 /* Let's not give out any delegations till everyone's
1688 * had the chance to reclaim theirs.... */
1689 if (nfs4_in_grace())
1690 goto out;
1691 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1692 goto out;
1693 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1694 flag = NFS4_OPEN_DELEGATE_WRITE;
1695 else
1696 flag = NFS4_OPEN_DELEGATE_READ;
1697 break;
1698 default:
1699 goto out;
1700 }
1da177e4
LT		 1701
1702 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1703 if (dp == NULL) {
1704 flag = NFS4_OPEN_DELEGATE_NONE;
1705 goto out;
1706 }
1707 locks_init_lock(&fl);
1708 fl.fl_lmops = &nfsd_lease_mng_ops;
1709 fl.fl_flags = FL_LEASE;
1710 fl.fl_end = OFFSET_MAX;
1711 fl.fl_owner = (fl_owner_t)dp;
1712 fl.fl_file = stp->st_vfs_file;
1713 fl.fl_pid = current->tgid;
1714
1715 /* setlease checks to see if delegation should be handed out.
1716 * the lock_manager callbacks fl_mylease and fl_change are used
1717 */
1718 if ((status = setlease(stp->st_vfs_file,
1719 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1720 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1721 unhash_delegation(dp);
1da177e4
LT		 1722 flag = NFS4_OPEN_DELEGATE_NONE;
1723 goto out;
1724 }
1725
1726 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1727
1728 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1729 dp->dl_stateid.si_boot,
1730 dp->dl_stateid.si_stateownerid,
1731 dp->dl_stateid.si_fileid,
1732 dp->dl_stateid.si_generation);
1733out:
7b190fec
N		 1734 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1735 && flag == NFS4_OPEN_DELEGATE_NONE
1736 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1737 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1738 open->op_delegate_type = flag;
1739}
1740
1741/*
1742 * called with nfs4_lock_state() held.
1743 */
b37ad28b 1744__be32
1da177e4
LT		 1745nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1746{
1747 struct nfs4_file *fp = NULL;
1748 struct inode *ino = current_fh->fh_dentry->d_inode;
1749 struct nfs4_stateid *stp = NULL;
567d9829 1750 struct nfs4_delegation *dp = NULL;
b37ad28b 1751 __be32 status;
1da177e4
LT		 1752
1753 status = nfserr_inval;
ba5a6a19
BF		 1754 if (!access_valid(open->op_share_access)
1755 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1756 goto out;
1757 /*
1758 * Lookup file; if found, lookup stateid and check open request,
1759 * and check for delegations in the process of being recalled.
1760 * If not found, create the nfs4_file struct
1761 */
1762 fp = find_file(ino);
1763 if (fp) {
1764 if ((status = nfs4_check_open(fp, open, &stp)))
1765 goto out;
c44c5eeb
N		 1766 status = nfs4_check_deleg(fp, open, &dp);
1767 if (status)
1768 goto out;
1da177e4 1769 } else {
c44c5eeb
N		 1770 status = nfserr_bad_stateid;
1771 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1772 goto out;
1da177e4
LT		 1773 status = nfserr_resource;
1774 fp = alloc_init_file(ino);
1775 if (fp == NULL)
1776 goto out;
1777 }
1778
1779 /*
1780 * OPEN the file, or upgrade an existing OPEN.
1781 * If truncate fails, the OPEN fails.
1782 */
1783 if (stp) {
1784 /* Stateid was found, this is an OPEN upgrade */
1785 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1786 if (status)
1787 goto out;
444c2c07 1788 update_stateid(&stp->st_stateid);
1da177e4
LT		 1789 } else {
1790 /* Stateid was not found, this is a new OPEN */
1791 int flags = 0;
9ecb6a08
BF		 1792 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1793 flags |= MAY_READ;
1da177e4 1794 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1795 flags |= MAY_WRITE;
567d9829
N		 1796 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1797 if (status)
1da177e4
LT		 1798 goto out;
1799 init_stateid(stp, fp, open);
1800 status = nfsd4_truncate(rqstp, current_fh, open);
1801 if (status) {
1802 release_stateid(stp, OPEN_STATE);
1803 goto out;
1804 }
1805 }
1806 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1807
1808 /*
1809 * Attempt to hand out a delegation. No error return, because the
1810 * OPEN succeeds even if we fail.
1811 */
1812 nfs4_open_delegation(current_fh, open, stp);
1813
1814 status = nfs_ok;
1815
1816 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1817 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1818 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1819out:
13cd2184
N		 1820 if (fp)
1821 put_nfs4_file(fp);
37515177
N		 1822 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1823 nfs4_set_claim_prev(open);
1da177e4
LT		 1824 /*
1825 * To finish the open response, we just need to set the rflags.
1826 */
1827 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1828 if (!open->op_stateowner->so_confirmed)
1829 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1830
1831 return status;
1832}
1833
58da282b 1834static struct workqueue_struct *laundry_wq;
c4028958
DH		 1835static void laundromat_main(struct work_struct *);
1836static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1837
b37ad28b 1838__be32
b591480b
BF		 1839nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1840 clientid_t *clid)
1da177e4
LT		 1841{
1842 struct nfs4_client *clp;
b37ad28b 1843 __be32 status;
1da177e4
LT		 1844
1845 nfs4_lock_state();
1846 dprintk("process_renew(%08x/%08x): starting\n",
1847 clid->cl_boot, clid->cl_id);
1848 status = nfserr_stale_clientid;
1849 if (STALE_CLIENTID(clid))
1850 goto out;
1851 clp = find_confirmed_client(clid);
1852 status = nfserr_expired;
1853 if (clp == NULL) {
1854 /* We assume the client took too long to RENEW. */
1855 dprintk("nfsd4_renew: clientid not found!\n");
1856 goto out;
1857 }
1858 renew_client(clp);
1859 status = nfserr_cb_path_down;
ea1da636 1860 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1861 && !atomic_read(&clp->cl_callback.cb_set))
1862 goto out;
1863 status = nfs_ok;
1864out:
1865 nfs4_unlock_state();
1866 return status;
1867}
1868
a76b4319
N		 1869static void
1870end_grace(void)
1871{
1872 dprintk("NFSD: end of grace period\n");
c7b9a459 1873 nfsd4_recdir_purge_old();
a76b4319
N		 1874 in_grace = 0;
1875}
1876
fd39ca9a 1877static time_t
1da177e4
LT		 1878nfs4_laundromat(void)
1879{
1880 struct nfs4_client *clp;
1881 struct nfs4_stateowner *sop;
1882 struct nfs4_delegation *dp;
1883 struct list_head *pos, *next, reaplist;
1884 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1885 time_t t, clientid_val = NFSD_LEASE_TIME;
1886 time_t u, test_val = NFSD_LEASE_TIME;
1887
1888 nfs4_lock_state();
1889
1890 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1891 if (in_grace)
1892 end_grace();
1da177e4
LT		 1893 list_for_each_safe(pos, next, &client_lru) {
1894 clp = list_entry(pos, struct nfs4_client, cl_lru);
1895 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1896 t = clp->cl_time - cutoff;
1897 if (clientid_val > t)
1898 clientid_val = t;
1899 break;
1900 }
1901 dprintk("NFSD: purging unused client (clientid %08x)\n",
1902 clp->cl_clientid.cl_id);
c7b9a459 1903 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1904 expire_client(clp);
1905 }
1906 INIT_LIST_HEAD(&reaplist);
1907 spin_lock(&recall_lock);
1908 list_for_each_safe(pos, next, &del_recall_lru) {
1909 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1910 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1911 u = dp->dl_time - cutoff;
1912 if (test_val > u)
1913 test_val = u;
1914 break;
1915 }
1916 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1917 dp, dp->dl_flock);
1918 list_move(&dp->dl_recall_lru, &reaplist);
1919 }
1920 spin_unlock(&recall_lock);
1921 list_for_each_safe(pos, next, &reaplist) {
1922 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1923 list_del_init(&dp->dl_recall_lru);
1924 unhash_delegation(dp);
1925 }
1926 test_val = NFSD_LEASE_TIME;
1927 list_for_each_safe(pos, next, &close_lru) {
1928 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1929 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1930 u = sop->so_time - cutoff;
1931 if (test_val > u)
1932 test_val = u;
1933 break;
1934 }
1935 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1936 sop->so_id);
358dd55a 1937 release_stateowner(sop);
1da177e4
LT		 1938 }
1939 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1940 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1941 nfs4_unlock_state();
1942 return clientid_val;
1943}
1944
1945void
c4028958 1946laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1947{
1948 time_t t;
1949
1950 t = nfs4_laundromat();
1951 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1952 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1953}
1954
fd39ca9a 1955static struct nfs4_stateowner *
f8816512
N		 1956search_close_lru(u32 st_id, int flags)
1957{
1da177e4
LT		 1958 struct nfs4_stateowner *local = NULL;
1959
1da177e4
LT		 1960 if (flags & CLOSE_STATE) {
1961 list_for_each_entry(local, &close_lru, so_close_lru) {
1962 if (local->so_id == st_id)
1963 return local;
1964 }
1965 }
1966 return NULL;
1967}
1968
1969static inline int
1970nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1971{
7eaa36e2 1972 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1973}
1974
1975static int
1976STALE_STATEID(stateid_t *stateid)
1977{
1978 if (stateid->si_boot == boot_time)
1979 return 0;
849823c5 1980 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1981 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1982 stateid->si_generation);
1983 return 1;
1984}
1985
1986static inline int
1987access_permit_read(unsigned long access_bmap)
1988{
1989 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1990 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1991 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1992}
1993
1994static inline int
1995access_permit_write(unsigned long access_bmap)
1996{
1997 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1998 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1999}
2000
2001static
b37ad28b 2002__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2003{
b37ad28b 2004 __be32 status = nfserr_openmode;
1da177e4
LT		 2005
2006 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2007 goto out;
2008 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2009 goto out;
2010 status = nfs_ok;
2011out:
2012 return status;
2013}
2014
b37ad28b 2015static inline __be32
1da177e4
LT		 2016check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2017{
2018 /* Trying to call delegreturn with a special stateid? Yuch: */
2019 if (!(flags & (RD_STATE | WR_STATE)))
2020 return nfserr_bad_stateid;
2021 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2022 return nfs_ok;
2023 else if (nfs4_in_grace()) {
2024 /* Answer in remaining cases depends on existance of
2025 * conflicting state; so we must wait out the grace period. */
2026 return nfserr_grace;
2027 } else if (flags & WR_STATE)
2028 return nfs4_share_conflict(current_fh,
2029 NFS4_SHARE_DENY_WRITE);
2030 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2031 return nfs4_share_conflict(current_fh,
2032 NFS4_SHARE_DENY_READ);
2033}
2034
2035/*
2036 * Allow READ/WRITE during grace period on recovered state only for files
2037 * that are not able to provide mandatory locking.
2038 */
2039static inline int
2040io_during_grace_disallowed(struct inode *inode, int flags)
2041{
2042 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2043 && MANDATORY_LOCK(inode);
2044}
2045
2046/*
2047* Checks for stateid operations
2048*/
b37ad28b 2049__be32
1da177e4
LT		 2050nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2051{
2052 struct nfs4_stateid *stp = NULL;
2053 struct nfs4_delegation *dp = NULL;
2054 stateid_t *stidp;
2055 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2056 __be32 status;
1da177e4
LT		 2057
2058 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2059 stateid->si_boot, stateid->si_stateownerid,
2060 stateid->si_fileid, stateid->si_generation);
2061 if (filpp)
2062 *filpp = NULL;
2063
2064 if (io_during_grace_disallowed(ino, flags))
2065 return nfserr_grace;
2066
2067 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2068 return check_special_stateids(current_fh, stateid, flags);
2069
2070 /* STALE STATEID */
2071 status = nfserr_stale_stateid;
2072 if (STALE_STATEID(stateid))
2073 goto out;
2074
2075 /* BAD STATEID */
2076 status = nfserr_bad_stateid;
2077 if (!stateid->si_fileid) { /* delegation stateid */
2078 if(!(dp = find_delegation_stateid(ino, stateid))) {
2079 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2080 goto out;
2081 }
2082 stidp = &dp->dl_stateid;
2083 } else { /* open or lock stateid */
2084 if (!(stp = find_stateid(stateid, flags))) {
2085 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2086 goto out;
2087 }
2088 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2089 goto out;
2090 if (!stp->st_stateowner->so_confirmed)
2091 goto out;
2092 stidp = &stp->st_stateid;
2093 }
2094 if (stateid->si_generation > stidp->si_generation)
2095 goto out;
2096
2097 /* OLD STATEID */
2098 status = nfserr_old_stateid;
2099 if (stateid->si_generation < stidp->si_generation)
2100 goto out;
2101 if (stp) {
2102 if ((status = nfs4_check_openmode(stp,flags)))
2103 goto out;
2104 renew_client(stp->st_stateowner->so_client);
2105 if (filpp)
2106 *filpp = stp->st_vfs_file;
2107 } else if (dp) {
2108 if ((status = nfs4_check_delegmode(dp, flags)))
2109 goto out;
2110 renew_client(dp->dl_client);
2111 if (flags & DELEG_RET)
2112 unhash_delegation(dp);
2113 if (filpp)
2114 *filpp = dp->dl_vfs_file;
2115 }
2116 status = nfs_ok;
2117out:
2118 return status;
2119}
2120
4c4cd222
N		 2121static inline int
2122setlkflg (int type)
2123{
2124 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2125 RD_STATE : WR_STATE;
2126}
1da177e4
LT		 2127
2128/*
2129 * Checks for sequence id mutating operations.
2130 */
b37ad28b 2131static __be32
4c4cd222 2132nfs4_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 2133{
1da177e4
LT		 2134 struct nfs4_stateid *stp;
2135 struct nfs4_stateowner *sop;
2136
2137 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2138 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2139 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2140 stateid->si_generation);
3a4f98bb 2141
1da177e4
LT		 2142 *stpp = NULL;
2143 *sopp = NULL;
2144
1da177e4
LT		 2145 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2146 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2147 return nfserr_bad_stateid;
1da177e4
LT		 2148 }
2149
1da177e4 2150 if (STALE_STATEID(stateid))
3a4f98bb 2151 return nfserr_stale_stateid;
1da177e4
LT		 2152 /*
2153 * We return BAD_STATEID if filehandle doesn't match stateid,
2154 * the confirmed flag is incorrecly set, or the generation
2155 * number is incorrect.
1da177e4 2156 */
f8816512
N		 2157 stp = find_stateid(stateid, flags);
2158 if (stp == NULL) {
2159 /*
2160 * Also, we should make sure this isn't just the result of
2161 * a replayed close:
2162 */
2163 sop = search_close_lru(stateid->si_stateownerid, flags);
2164 if (sop == NULL)
2165 return nfserr_bad_stateid;
2166 *sopp = sop;
2167 goto check_replay;
2168 }
1da177e4 2169
4c4cd222 2170 if (lock) {
1da177e4 2171 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2172 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2173 struct nfs4_client *clp = sop->so_client;
4c4cd222 2174 int lkflg = 0;
b37ad28b 2175 __be32 status;
4c4cd222
N		 2176
2177 lkflg = setlkflg(lock->lk_type);
2178
2179 if (lock->lk_is_new) {
2180 if (!sop->so_is_open_owner)
2181 return nfserr_bad_stateid;
2182 if (!cmp_clid(&clp->cl_clientid, lockclid))
2183 return nfserr_bad_stateid;
2184 /* stp is the open stateid */
2185 status = nfs4_check_openmode(stp, lkflg);
2186 if (status)
2187 return status;
2188 } else {
2189 /* stp is the lock stateid */
2190 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2191 if (status)
2192 return status;
2193 }
1da177e4 2194
1da177e4
LT		 2195 }
2196
2197 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2198 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2199 return nfserr_bad_stateid;
1da177e4
LT		 2200 }
2201
2202 *stpp = stp;
2203 *sopp = sop = stp->st_stateowner;
2204
2205 /*
2206 * We now validate the seqid and stateid generation numbers.
2207 * For the moment, we ignore the possibility of
2208 * generation number wraparound.
2209 */
bd9aac52 2210 if (seqid != sop->so_seqid)
1da177e4
LT		 2211 goto check_replay;
2212
3a4f98bb
N		 2213 if (sop->so_confirmed && flags & CONFIRM) {
2214 printk("NFSD: preprocess_seqid_op: expected"
2215 " unconfirmed stateowner!\n");
2216 return nfserr_bad_stateid;
1da177e4 2217 }
3a4f98bb
N		 2218 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2219 printk("NFSD: preprocess_seqid_op: stateowner not"
2220 " confirmed yet!\n");
2221 return nfserr_bad_stateid;
1da177e4
LT		 2222 }
2223 if (stateid->si_generation > stp->st_stateid.si_generation) {
2224 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2225 return nfserr_bad_stateid;
1da177e4
LT		 2226 }
2227
1da177e4
LT		 2228 if (stateid->si_generation < stp->st_stateid.si_generation) {
2229 printk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2230 return nfserr_old_stateid;
1da177e4 2231 }
52fd004e 2232 renew_client(sop->so_client);
3a4f98bb 2233 return nfs_ok;
1da177e4 2234
1da177e4 2235check_replay:
bd9aac52 2236 if (seqid == sop->so_seqid - 1) {
849823c5 2237 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2238 /* indicate replay to calling function */
a90b061c 2239 return nfserr_replay_me;
1da177e4 2240 }
3a4f98bb
N		 2241 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2242 sop->so_seqid, seqid);
2243 *sopp = NULL;
2244 return nfserr_bad_seqid;
1da177e4
LT		 2245}
2246
b37ad28b 2247__be32
ca364317 2248nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2249 struct nfsd4_open_confirm *oc)
1da177e4 2250{
b37ad28b 2251 __be32 status;
1da177e4
LT		 2252 struct nfs4_stateowner *sop;
2253 struct nfs4_stateid *stp;
2254
2255 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2256 (int)cstate->current_fh.fh_dentry->d_name.len,
2257 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2258
ca364317 2259 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2260 if (status)
2261 return status;
1da177e4
LT		 2262
2263 nfs4_lock_state();
2264
ca364317
BF		 2265 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2266 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2267 CHECK_FH | CONFIRM | OPEN_STATE,
2268 &oc->oc_stateowner, &stp, NULL)))
2269 goto out;
2270
2271 sop = oc->oc_stateowner;
2272 sop->so_confirmed = 1;
2273 update_stateid(&stp->st_stateid);
2274 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2275 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2276 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2277 stp->st_stateid.si_boot,
2278 stp->st_stateid.si_stateownerid,
2279 stp->st_stateid.si_fileid,
2280 stp->st_stateid.si_generation);
c7b9a459
N		 2281
2282 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2283out:
f2327d9a 2284 if (oc->oc_stateowner) {
1da177e4 2285 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2286 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2287 }
1da177e4
LT		 2288 nfs4_unlock_state();
2289 return status;
2290}
2291
2292
2293/*
2294 * unset all bits in union bitmap (bmap) that
2295 * do not exist in share (from successful OPEN_DOWNGRADE)
2296 */
2297static void
2298reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2299{
2300 int i;
2301 for (i = 1; i < 4; i++) {
2302 if ((i & access) != i)
2303 __clear_bit(i, bmap);
2304 }
2305}
2306
2307static void
2308reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2309{
2310 int i;
2311 for (i = 0; i < 4; i++) {
2312 if ((i & deny) != i)
2313 __clear_bit(i, bmap);
2314 }
2315}
2316
b37ad28b 2317__be32
ca364317
BF		 2318nfsd4_open_downgrade(struct svc_rqst *rqstp,
2319 struct nfsd4_compound_state *cstate,
a4f1706a 2320 struct nfsd4_open_downgrade *od)
1da177e4 2321{
b37ad28b 2322 __be32 status;
1da177e4
LT		 2323 struct nfs4_stateid *stp;
2324 unsigned int share_access;
2325
2326 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2327 (int)cstate->current_fh.fh_dentry->d_name.len,
2328 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2329
ba5a6a19
BF		 2330 if (!access_valid(od->od_share_access)
2331 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2332 return nfserr_inval;
2333
2334 nfs4_lock_state();
ca364317
BF		 2335 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2336 od->od_seqid,
1da177e4
LT		 2337 &od->od_stateid,
2338 CHECK_FH | OPEN_STATE,
2339 &od->od_stateowner, &stp, NULL)))
2340 goto out;
2341
2342 status = nfserr_inval;
2343 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2344 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2345 stp->st_access_bmap, od->od_share_access);
2346 goto out;
2347 }
2348 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2349 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2350 stp->st_deny_bmap, od->od_share_deny);
2351 goto out;
2352 }
2353 set_access(&share_access, stp->st_access_bmap);
2354 nfs4_file_downgrade(stp->st_vfs_file,
2355 share_access & ~od->od_share_access);
2356
2357 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2358 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2359
2360 update_stateid(&stp->st_stateid);
2361 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2362 status = nfs_ok;
2363out:
f2327d9a 2364 if (od->od_stateowner) {
1da177e4 2365 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2366 cstate->replay_owner = od->od_stateowner;
f2327d9a 2367 }
1da177e4
LT		 2368 nfs4_unlock_state();
2369 return status;
2370}
2371
2372/*
2373 * nfs4_unlock_state() called after encode
2374 */
b37ad28b 2375__be32
ca364317 2376nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2377 struct nfsd4_close *close)
1da177e4 2378{
b37ad28b 2379 __be32 status;
1da177e4
LT		 2380 struct nfs4_stateid *stp;
2381
2382 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2383 (int)cstate->current_fh.fh_dentry->d_name.len,
2384 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2385
2386 nfs4_lock_state();
2387 /* check close_lru for replay */
ca364317
BF		 2388 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2389 close->cl_seqid,
1da177e4
LT		 2390 &close->cl_stateid,
2391 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2392 &close->cl_stateowner, &stp, NULL)))
2393 goto out;
1da177e4
LT		 2394 status = nfs_ok;
2395 update_stateid(&stp->st_stateid);
2396 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2397
04ef5954
BF		 2398 /* release_stateid() calls nfsd_close() if needed */
2399 release_stateid(stp, OPEN_STATE);
2400
2401 /* place unused nfs4_stateowners on so_close_lru list to be
2402 * released by the laundromat service after the lease period
2403 * to enable us to handle CLOSE replay
2404 */
2405 if (list_empty(&close->cl_stateowner->so_stateids))
2406 move_to_close_lru(close->cl_stateowner);
1da177e4 2407out:
f2327d9a 2408 if (close->cl_stateowner) {
1da177e4 2409 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2410 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2411 }
1da177e4
LT		 2412 nfs4_unlock_state();
2413 return status;
2414}
2415
b37ad28b 2416__be32
ca364317
BF		 2417nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2418 struct nfsd4_delegreturn *dr)
1da177e4 2419{
b37ad28b 2420 __be32 status;
1da177e4 2421
ca364317 2422 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2423 goto out;
2424
2425 nfs4_lock_state();
ca364317
BF		 2426 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2427 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2428 nfs4_unlock_state();
2429out:
2430 return status;
2431}
2432
2433
2434/*
2435 * Lock owner state (byte-range locks)
2436 */
2437#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2438#define LOCK_HASH_BITS 8
2439#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2440#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2441
2442#define lockownerid_hashval(id) \
2443 ((id) & LOCK_HASH_MASK)
2444
2445static inline unsigned int
2446lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2447 struct xdr_netobj *ownername)
2448{
2449 return (file_hashval(inode) + cl_id
2450 + opaque_hashval(ownername->data, ownername->len))
2451 & LOCK_HASH_MASK;
2452}
2453
2454static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2455static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2456static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2457
fd39ca9a 2458static struct nfs4_stateid *
1da177e4
LT		 2459find_stateid(stateid_t *stid, int flags)
2460{
2461 struct nfs4_stateid *local = NULL;
2462 u32 st_id = stid->si_stateownerid;
2463 u32 f_id = stid->si_fileid;
2464 unsigned int hashval;
2465
2466 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2467 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2468 hashval = stateid_hashval(st_id, f_id);
2469 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2470 if ((local->st_stateid.si_stateownerid == st_id) &&
2471 (local->st_stateid.si_fileid == f_id))
2472 return local;
2473 }
2474 }
2475 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2476 hashval = stateid_hashval(st_id, f_id);
2477 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2478 if ((local->st_stateid.si_stateownerid == st_id) &&
2479 (local->st_stateid.si_fileid == f_id))
2480 return local;
2481 }
849823c5 2482 }
1da177e4
LT		 2483 return NULL;
2484}
2485
2486static struct nfs4_delegation *
2487find_delegation_stateid(struct inode *ino, stateid_t *stid)
2488{
13cd2184
N		 2489 struct nfs4_file *fp;
2490 struct nfs4_delegation *dl;
1da177e4
LT		 2491
2492 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2493 stid->si_boot, stid->si_stateownerid,
2494 stid->si_fileid, stid->si_generation);
2495
1da177e4 2496 fp = find_file(ino);
13cd2184
N		 2497 if (!fp)
2498 return NULL;
2499 dl = find_delegation_file(fp, stid);
2500 put_nfs4_file(fp);
2501 return dl;
1da177e4
LT		 2502}
2503
2504/*
2505 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2506 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2507 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2508 * locking, this prevents us from being completely protocol-compliant. The
2509 * real solution to this problem is to start using unsigned file offsets in
2510 * the VFS, but this is a very deep change!
2511 */
2512static inline void
2513nfs4_transform_lock_offset(struct file_lock *lock)
2514{
2515 if (lock->fl_start < 0)
2516 lock->fl_start = OFFSET_MAX;
2517 if (lock->fl_end < 0)
2518 lock->fl_end = OFFSET_MAX;
2519}
2520
d5b9026a
N		 2521/* Hack!: For now, we're defining this just so we can use a pointer to it
2522 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2523static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2524};
1da177e4
LT		 2525
2526static inline void
2527nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2528{
d5b9026a
N		 2529 struct nfs4_stateowner *sop;
2530 unsigned int hval;
1da177e4 2531
d5b9026a
N		 2532 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2533 sop = (struct nfs4_stateowner *) fl->fl_owner;
2534 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2535 kref_get(&sop->so_ref);
2536 deny->ld_sop = sop;
2537 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2538 } else {
2539 deny->ld_sop = NULL;
2540 deny->ld_clientid.cl_boot = 0;
2541 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2542 }
2543 deny->ld_start = fl->fl_start;
2544 deny->ld_length = ~(u64)0;
2545 if (fl->fl_end != ~(u64)0)
2546 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2547 deny->ld_type = NFS4_READ_LT;
2548 if (fl->fl_type != F_RDLCK)
2549 deny->ld_type = NFS4_WRITE_LT;
2550}
2551
1da177e4
LT		 2552static struct nfs4_stateowner *
2553find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2554 struct xdr_netobj *owner)
2555{
2556 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2557 struct nfs4_stateowner *op;
2558
2559 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2560 if (cmp_owner_str(op, owner, clid))
2561 return op;
2562 }
2563 return NULL;
2564}
2565
2566/*
2567 * Alloc a lock owner structure.
2568 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2569 * occured.
2570 *
2571 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2572 */
2573
2574static struct nfs4_stateowner *
2575alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2576 struct nfs4_stateowner *sop;
2577 struct nfs4_replay *rp;
2578 unsigned int idhashval;
2579
2580 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2581 return NULL;
2582 idhashval = lockownerid_hashval(current_ownerid);
2583 INIT_LIST_HEAD(&sop->so_idhash);
2584 INIT_LIST_HEAD(&sop->so_strhash);
2585 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2586 INIT_LIST_HEAD(&sop->so_stateids);
2587 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2588 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2589 sop->so_time = 0;
2590 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2591 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2592 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2593 sop->so_is_open_owner = 0;
2594 sop->so_id = current_ownerid++;
2595 sop->so_client = clp;
b59e3c0e
NB		 2596 /* It is the openowner seqid that will be incremented in encode in the
2597 * case of new lockowners; so increment the lock seqid manually: */
2598 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2599 sop->so_confirmed = 1;
2600 rp = &sop->so_replay;
de1ae286 2601 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2602 rp->rp_buflen = 0;
2603 rp->rp_buf = rp->rp_ibuf;
2604 return sop;
2605}
2606
fd39ca9a 2607static struct nfs4_stateid *
1da177e4
LT		 2608alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2609{
2610 struct nfs4_stateid *stp;
2611 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2612
5ac049ac
N		 2613 stp = nfs4_alloc_stateid();
2614 if (stp == NULL)
1da177e4
LT		 2615 goto out;
2616 INIT_LIST_HEAD(&stp->st_hash);
2617 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2618 INIT_LIST_HEAD(&stp->st_perstateowner);
2619 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2620 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2621 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2622 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2623 stp->st_stateowner = sop;
13cd2184 2624 get_nfs4_file(fp);
1da177e4
LT		 2625 stp->st_file = fp;
2626 stp->st_stateid.si_boot = boot_time;
2627 stp->st_stateid.si_stateownerid = sop->so_id;
2628 stp->st_stateid.si_fileid = fp->fi_id;
2629 stp->st_stateid.si_generation = 0;
2630 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2631 stp->st_access_bmap = open_stp->st_access_bmap;
2632 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2633 stp->st_openstp = open_stp;
1da177e4
LT		 2634
2635out:
2636 return stp;
2637}
2638
fd39ca9a 2639static int
1da177e4
LT		 2640check_lock_length(u64 offset, u64 length)
2641{
2642 return ((length == 0) || ((length != ~(u64)0) &&
2643 LOFF_OVERFLOW(offset, length)));
2644}
2645
2646/*
2647 * LOCK operation
2648 */
b37ad28b 2649__be32
ca364317 2650nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2651 struct nfsd4_lock *lock)
1da177e4 2652{
3e9e3dbe 2653 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2654 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2655 struct nfs4_stateid *lock_stp;
2656 struct file *filp;
2657 struct file_lock file_lock;
8dc7c311 2658 struct file_lock conflock;
b37ad28b 2659 __be32 status = 0;
1da177e4 2660 unsigned int strhashval;
b8dd7b9a 2661 int err;
1da177e4
LT		 2662
2663 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2664 (long long) lock->lk_offset,
2665 (long long) lock->lk_length);
2666
1da177e4
LT		 2667 if (check_lock_length(lock->lk_offset, lock->lk_length))
2668 return nfserr_inval;
2669
ca364317
BF		 2670 if ((status = fh_verify(rqstp, &cstate->current_fh,
2671 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2672 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2673 return status;
2674 }
2675
1da177e4
LT		 2676 nfs4_lock_state();
2677
2678 if (lock->lk_is_new) {
893f8770
N		 2679 /*
2680 * Client indicates that this is a new lockowner.
2681 * Use open owner and open stateid to create lock owner and
2682 * lock stateid.
2683 */
1da177e4
LT		 2684 struct nfs4_stateid *open_stp = NULL;
2685 struct nfs4_file *fp;
2686
2687 status = nfserr_stale_clientid;
849823c5 2688 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2689 goto out;
1da177e4 2690
1da177e4 2691 /* validate and update open stateid and open seqid */
ca364317 2692 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2693 lock->lk_new_open_seqid,
2694 &lock->lk_new_open_stateid,
2695 CHECK_FH | OPEN_STATE,
3a65588a 2696 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2697 lock);
37515177 2698 if (status)
1da177e4 2699 goto out;
3a65588a 2700 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2701 /* create lockowner and lock stateid */
2702 fp = open_stp->st_file;
2703 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2704 open_sop->so_client->cl_clientid.cl_id,
2705 &lock->v.new.owner);
3e9e3dbe
N		 2706 /* XXX: Do we need to check for duplicate stateowners on
2707 * the same file, or should they just be allowed (and
2708 * create new stateids)? */
1da177e4 2709 status = nfserr_resource;
b59e3c0e
NB		 2710 lock_sop = alloc_init_lock_stateowner(strhashval,
2711 open_sop->so_client, open_stp, lock);
2712 if (lock_sop == NULL)
1da177e4 2713 goto out;
b59e3c0e 2714 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2715 if (lock_stp == NULL)
1da177e4 2716 goto out;
1da177e4
LT		 2717 } else {
2718 /* lock (lock owner + lock stateid) already exists */
ca364317 2719 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2720 lock->lk_old_lock_seqid,
2721 &lock->lk_old_lock_stateid,
2722 CHECK_FH | LOCK_STATE,
3a65588a 2723 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2724 if (status)
2725 goto out;
3a65588a 2726 lock_sop = lock->lk_replay_owner;
1da177e4 2727 }
3a65588a 2728 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2729 filp = lock_stp->st_vfs_file;
2730
0dd395dc
N		 2731 status = nfserr_grace;
2732 if (nfs4_in_grace() && !lock->lk_reclaim)
2733 goto out;
2734 status = nfserr_no_grace;
2735 if (!nfs4_in_grace() && lock->lk_reclaim)
2736 goto out;
2737
1da177e4
LT		 2738 locks_init_lock(&file_lock);
2739 switch (lock->lk_type) {
2740 case NFS4_READ_LT:
2741 case NFS4_READW_LT:
2742 file_lock.fl_type = F_RDLCK;
2743 break;
2744 case NFS4_WRITE_LT:
2745 case NFS4_WRITEW_LT:
2746 file_lock.fl_type = F_WRLCK;
2747 break;
2748 default:
2749 status = nfserr_inval;
2750 goto out;
2751 }
b59e3c0e 2752 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2753 file_lock.fl_pid = current->tgid;
2754 file_lock.fl_file = filp;
2755 file_lock.fl_flags = FL_POSIX;
d5b9026a 2756 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2757
2758 file_lock.fl_start = lock->lk_offset;
2759 if ((lock->lk_length == ~(u64)0) ||
2760 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2761 file_lock.fl_end = ~(u64)0;
2762 else
2763 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2764 nfs4_transform_lock_offset(&file_lock);
2765
2766 /*
2767 * Try to lock the file in the VFS.
2768 * Note: locks.c uses the BKL to protect the inode's lock list.
2769 */
2770
eb76b3fd
AA		 2771 /* XXX?: Just to divert the locks_release_private at the start of
2772 * locks_copy_lock: */
2773 conflock.fl_ops = NULL;
2774 conflock.fl_lmops = NULL;
b8dd7b9a 2775 err = posix_lock_file_conf(filp, &file_lock, &conflock);
b8dd7b9a 2776 switch (-err) {
1da177e4
LT		 2777 case 0: /* success! */
2778 update_stateid(&lock_stp->st_stateid);
2779 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2780 sizeof(stateid_t));
b8dd7b9a 2781 status = 0;
eb76b3fd
AA		 2782 break;
2783 case (EAGAIN): /* conflock holds conflicting lock */
2784 status = nfserr_denied;
2785 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2786 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2787 break;
1da177e4
LT		 2788 case (EDEADLK):
2789 status = nfserr_deadlock;
eb76b3fd 2790 break;
1da177e4 2791 default:
b8dd7b9a 2792 dprintk("NFSD: nfsd4_lock: posix_lock_file_conf() failed! status %d\n",err);
eb76b3fd
AA		 2793 status = nfserr_resource;
2794 break;
1da177e4 2795 }
1da177e4 2796out:
8a280510
BF		 2797 if (status && lock->lk_is_new && lock_sop)
2798 release_stateowner(lock_sop);
3a65588a
BF		 2799 if (lock->lk_replay_owner) {
2800 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2801 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2802 }
1da177e4
LT		 2803 nfs4_unlock_state();
2804 return status;
2805}
2806
2807/*
2808 * LOCKT operation
2809 */
b37ad28b 2810__be32
ca364317
BF		 2811nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2812 struct nfsd4_lockt *lockt)
1da177e4
LT		 2813{
2814 struct inode *inode;
2815 struct file file;
2816 struct file_lock file_lock;
8dc7c311 2817 struct file_lock conflock;
b37ad28b 2818 __be32 status;
1da177e4
LT		 2819
2820 if (nfs4_in_grace())
2821 return nfserr_grace;
2822
2823 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2824 return nfserr_inval;
2825
2826 lockt->lt_stateowner = NULL;
2827 nfs4_lock_state();
2828
2829 status = nfserr_stale_clientid;
849823c5 2830 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2831 goto out;
1da177e4 2832
ca364317 2833 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2834 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2835 if (status == nfserr_symlink)
2836 status = nfserr_inval;
2837 goto out;
2838 }
2839
ca364317 2840 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2841 locks_init_lock(&file_lock);
2842 switch (lockt->lt_type) {
2843 case NFS4_READ_LT:
2844 case NFS4_READW_LT:
2845 file_lock.fl_type = F_RDLCK;
2846 break;
2847 case NFS4_WRITE_LT:
2848 case NFS4_WRITEW_LT:
2849 file_lock.fl_type = F_WRLCK;
2850 break;
2851 default:
2852 printk("NFSD: nfs4_lockt: bad lock type!\n");
2853 status = nfserr_inval;
2854 goto out;
2855 }
2856
2857 lockt->lt_stateowner = find_lockstateowner_str(inode,
2858 &lockt->lt_clientid, &lockt->lt_owner);
2859 if (lockt->lt_stateowner)
2860 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2861 file_lock.fl_pid = current->tgid;
2862 file_lock.fl_flags = FL_POSIX;
d5b9026a 2863 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2864
2865 file_lock.fl_start = lockt->lt_offset;
2866 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2867 file_lock.fl_end = ~(u64)0;
2868 else
2869 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2870
2871 nfs4_transform_lock_offset(&file_lock);
2872
2873 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2874 * since LOCKT doesn't require an OPEN, and therefore a struct
2875 * file may not exist, pass posix_test_lock a struct file with
2876 * only the dentry:inode set.
2877 */
2878 memset(&file, 0, sizeof (struct file));
ca364317 2879 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2880
2881 status = nfs_ok;
8dc7c311 2882 if (posix_test_lock(&file, &file_lock, &conflock)) {
1da177e4 2883 status = nfserr_denied;
8dc7c311 2884 nfs4_set_lock_denied(&conflock, &lockt->lt_denied);
1da177e4
LT		 2885 }
2886out:
2887 nfs4_unlock_state();
2888 return status;
2889}
2890
b37ad28b 2891__be32
ca364317 2892nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2893 struct nfsd4_locku *locku)
1da177e4
LT		 2894{
2895 struct nfs4_stateid *stp;
2896 struct file *filp = NULL;
2897 struct file_lock file_lock;
b37ad28b 2898 __be32 status;
b8dd7b9a 2899 int err;
1da177e4
LT		 2900
2901 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2902 (long long) locku->lu_offset,
2903 (long long) locku->lu_length);
2904
2905 if (check_lock_length(locku->lu_offset, locku->lu_length))
2906 return nfserr_inval;
2907
2908 nfs4_lock_state();
2909
ca364317 2910 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2911 locku->lu_seqid,
2912 &locku->lu_stateid,
2913 CHECK_FH | LOCK_STATE,
2914 &locku->lu_stateowner, &stp, NULL)))
2915 goto out;
2916
2917 filp = stp->st_vfs_file;
2918 BUG_ON(!filp);
2919 locks_init_lock(&file_lock);
2920 file_lock.fl_type = F_UNLCK;
2921 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2922 file_lock.fl_pid = current->tgid;
2923 file_lock.fl_file = filp;
2924 file_lock.fl_flags = FL_POSIX;
d5b9026a 2925 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2926 file_lock.fl_start = locku->lu_offset;
2927
2928 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2929 file_lock.fl_end = ~(u64)0;
2930 else
2931 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2932 nfs4_transform_lock_offset(&file_lock);
2933
2934 /*
2935 * Try to unlock the file in the VFS.
2936 */
b8dd7b9a
AV		 2937 err = posix_lock_file(filp, &file_lock);
2938 if (err) {
849823c5 2939 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
1da177e4
LT		 2940 goto out_nfserr;
2941 }
2942 /*
2943 * OK, unlock succeeded; the only thing left to do is update the stateid.
2944 */
2945 update_stateid(&stp->st_stateid);
2946 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2947
2948out:
f2327d9a 2949 if (locku->lu_stateowner) {
1da177e4 2950 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2951 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2952 }
1da177e4
LT		 2953 nfs4_unlock_state();
2954 return status;
2955
2956out_nfserr:
b8dd7b9a 2957 status = nfserrno(err);
1da177e4
LT		 2958 goto out;
2959}
2960
2961/*
2962 * returns
2963 * 1: locks held by lockowner
2964 * 0: no locks held by lockowner
2965 */
2966static int
2967check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2968{
2969 struct file_lock **flpp;
7eaa36e2 2970 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2971 int status = 0;
2972
2973 lock_kernel();
2974 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2975 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2976 status = 1;
2977 goto out;
796dadfd 2978 }
1da177e4
LT		 2979 }
2980out:
2981 unlock_kernel();
2982 return status;
2983}
2984
b37ad28b 2985__be32
b591480b
BF		 2986nfsd4_release_lockowner(struct svc_rqst *rqstp,
2987 struct nfsd4_compound_state *cstate,
2988 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2989{
2990 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2991 struct nfs4_stateowner *sop;
2992 struct nfs4_stateid *stp;
1da177e4 2993 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2994 struct list_head matches;
2995 int i;
b37ad28b 2996 __be32 status;
1da177e4
LT		 2997
2998 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2999 clid->cl_boot, clid->cl_id);
3000
3001 /* XXX check for lease expiration */
3002
3003 status = nfserr_stale_clientid;
849823c5 3004 if (STALE_CLIENTID(clid))
1da177e4 3005 return status;
1da177e4
LT		 3006
3007 nfs4_lock_state();
3008
3e9e3dbe
N		 3009 status = nfserr_locks_held;
3010 /* XXX: we're doing a linear search through all the lockowners.
3011 * Yipes! For now we'll just hope clients aren't really using
3012 * release_lockowner much, but eventually we have to fix these
3013 * data structures. */
3014 INIT_LIST_HEAD(&matches);
3015 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3016 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3017 if (!cmp_owner_str(sop, owner, clid))
3018 continue;
3019 list_for_each_entry(stp, &sop->so_stateids,
3020 st_perstateowner) {
3021 if (check_for_locks(stp->st_vfs_file, sop))
3022 goto out;
3023 /* Note: so_perclient unused for lockowners,
3024 * so it's OK to fool with here. */
3025 list_add(&sop->so_perclient, &matches);
3026 }
1da177e4 3027 }
3e9e3dbe
N		 3028 }
3029 /* Clients probably won't expect us to return with some (but not all)
3030 * of the lockowner state released; so don't release any until all
3031 * have been checked. */
3032 status = nfs_ok;
0fa822e4
N		 3033 while (!list_empty(&matches)) {
3034 sop = list_entry(matches.next, struct nfs4_stateowner,
3035 so_perclient);
3036 /* unhash_stateowner deletes so_perclient only
3037 * for openowners. */
3038 list_del(&sop->so_perclient);
3e9e3dbe 3039 release_stateowner(sop);
1da177e4
LT		 3040 }
3041out:
3042 nfs4_unlock_state();
3043 return status;
3044}
3045
3046static inline struct nfs4_client_reclaim *
a55370a3 3047alloc_reclaim(void)
1da177e4 3048{
a55370a3 3049 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3050}
3051
c7b9a459
N		 3052int
3053nfs4_has_reclaimed_state(const char *name)
3054{
3055 unsigned int strhashval = clientstr_hashval(name);
3056 struct nfs4_client *clp;
3057
3058 clp = find_confirmed_client_by_str(name, strhashval);
3059 return clp ? 1 : 0;
3060}
3061
1da177e4
LT		 3062/*
3063 * failure => all reset bets are off, nfserr_no_grace...
3064 */
190e4fbf
N		 3065int
3066nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3067{
3068 unsigned int strhashval;
3069 struct nfs4_client_reclaim *crp = NULL;
3070
a55370a3
N		 3071 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3072 crp = alloc_reclaim();
1da177e4
LT		 3073 if (!crp)
3074 return 0;
a55370a3 3075 strhashval = clientstr_hashval(name);
1da177e4
LT		 3076 INIT_LIST_HEAD(&crp->cr_strhash);
3077 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3078 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3079 reclaim_str_hashtbl_size++;
3080 return 1;
3081}
3082
3083static void
3084nfs4_release_reclaim(void)
3085{
3086 struct nfs4_client_reclaim *crp = NULL;
3087 int i;
3088
1da177e4
LT		 3089 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3090 while (!list_empty(&reclaim_str_hashtbl[i])) {
3091 crp = list_entry(reclaim_str_hashtbl[i].next,
3092 struct nfs4_client_reclaim, cr_strhash);
3093 list_del(&crp->cr_strhash);
1da177e4
LT		 3094 kfree(crp);
3095 reclaim_str_hashtbl_size--;
3096 }
3097 }
3098 BUG_ON(reclaim_str_hashtbl_size);
3099}
3100
3101/*
3102 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3103static struct nfs4_client_reclaim *
1da177e4
LT		 3104nfs4_find_reclaim_client(clientid_t *clid)
3105{
3106 unsigned int strhashval;
3107 struct nfs4_client *clp;
3108 struct nfs4_client_reclaim *crp = NULL;
3109
3110
3111 /* find clientid in conf_id_hashtbl */
3112 clp = find_confirmed_client(clid);
3113 if (clp == NULL)
3114 return NULL;
3115
a55370a3
N		 3116 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3117 clp->cl_name.len, clp->cl_name.data,
3118 clp->cl_recdir);
1da177e4
LT		 3119
3120 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3121 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3122 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3123 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3124 return crp;
3125 }
3126 }
3127 return NULL;
3128}
3129
3130/*
3131* Called from OPEN. Look for clientid in reclaim list.
3132*/
b37ad28b 3133__be32
1da177e4
LT		 3134nfs4_check_open_reclaim(clientid_t *clid)
3135{
dfc83565 3136 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3137}
3138
ac4d8ff2 3139/* initialization to perform at module load time: */
1da177e4 3140
ac4d8ff2
N		 3141void
3142nfs4_state_init(void)
1da177e4
LT		 3143{
3144 int i;
1da177e4 3145
1da177e4
LT		 3146 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3147 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3148 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3149 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3150 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3151 }
3152 for (i = 0; i < FILE_HASH_SIZE; i++) {
3153 INIT_LIST_HEAD(&file_hashtbl[i]);
3154 }
3155 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3156 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3157 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3158 }
3159 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3160 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3161 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3162 }
3163 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3164 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3165 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3166 }
1da177e4 3167 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3168 INIT_LIST_HEAD(&close_lru);
3169 INIT_LIST_HEAD(&client_lru);
3170 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3171 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3172 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3173 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3174}
3175
190e4fbf
N		 3176static void
3177nfsd4_load_reboot_recovery_data(void)
3178{
3179 int status;
3180
0964a3d3
N		 3181 nfs4_lock_state();
3182 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3183 status = nfsd4_recdir_load();
0964a3d3 3184 nfs4_unlock_state();
190e4fbf
N		 3185 if (status)
3186 printk("NFSD: Failure reading reboot recovery data\n");
3187}
3188
ac4d8ff2
N		 3189/* initialization to perform when the nfsd service is started: */
3190
3191static void
3192__nfs4_state_start(void)
3193{
3194 time_t grace_time;
3195
1da177e4 3196 boot_time = get_seconds();
d99a05ad
N		 3197 grace_time = max(user_lease_time, lease_time);
3198 lease_time = user_lease_time;
a76b4319 3199 in_grace = 1;
d99a05ad 3200 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3201 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3202 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3203}
3204
3205int
76a3550e 3206nfs4_state_start(void)
1da177e4
LT		 3207{
3208 int status;
3209
3210 if (nfs4_init)
3211 return 0;
3212 status = nfsd4_init_slabs();
3213 if (status)
3214 return status;
190e4fbf 3215 nfsd4_load_reboot_recovery_data();
76a3550e 3216 __nfs4_state_start();
1da177e4
LT		 3217 nfs4_init = 1;
3218 return 0;
3219}
3220
3221int
3222nfs4_in_grace(void)
3223{
a76b4319 3224 return in_grace;
1da177e4
LT		 3225}
3226
3227time_t
3228nfs4_lease_time(void)
3229{
3230 return lease_time;
3231}
3232
3233static void
3234__nfs4_state_shutdown(void)
3235{
3236 int i;
3237 struct nfs4_client *clp = NULL;
3238 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3239 struct list_head *pos, *next, reaplist;
3240
1da177e4
LT		 3241 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3242 while (!list_empty(&conf_id_hashtbl[i])) {
3243 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3244 expire_client(clp);
3245 }
3246 while (!list_empty(&unconf_str_hashtbl[i])) {
3247 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3248 expire_client(clp);
3249 }
3250 }
3251 INIT_LIST_HEAD(&reaplist);
3252 spin_lock(&recall_lock);
3253 list_for_each_safe(pos, next, &del_recall_lru) {
3254 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3255 list_move(&dp->dl_recall_lru, &reaplist);
3256 }
3257 spin_unlock(&recall_lock);
3258 list_for_each_safe(pos, next, &reaplist) {
3259 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3260 list_del_init(&dp->dl_recall_lru);
3261 unhash_delegation(dp);
3262 }
3263
1da177e4 3264 cancel_delayed_work(&laundromat_work);
190e4fbf 3265 nfsd4_shutdown_recdir();
1da177e4 3266 nfs4_init = 0;
1da177e4
LT		 3267}
3268
3269void
3270nfs4_state_shutdown(void)
3271{
5e8d5c29
N		 3272 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3273 destroy_workqueue(laundry_wq);
1da177e4
LT		 3274 nfs4_lock_state();
3275 nfs4_release_reclaim();
3276 __nfs4_state_shutdown();
3277 nfsd4_free_slabs();
3278 nfs4_unlock_state();
3279}
3280
0964a3d3
N		 3281static void
3282nfs4_set_recdir(char *recdir)
3283{
3284 nfs4_lock_state();
3285 strcpy(user_recovery_dirname, recdir);
3286 nfs4_unlock_state();
3287}
3288
3289/*
3290 * Change the NFSv4 recovery directory to recdir.
3291 */
3292int
3293nfs4_reset_recoverydir(char *recdir)
3294{
3295 int status;
3296 struct nameidata nd;
3297
3298 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3299 if (status)
3300 return status;
3301 status = -ENOTDIR;
3302 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3303 nfs4_set_recdir(recdir);
3304 status = 0;
3305 }
3306 path_release(&nd);
3307 return status;
3308}
3309
1da177e4
LT		 3310/*
3311 * Called when leasetime is changed.
3312 *
d99a05ad
N		 3313 * The only way the protocol gives us to handle on-the-fly lease changes is to
3314 * simulate a reboot. Instead of doing that, we just wait till the next time
3315 * we start to register any changes in lease time. If the administrator
3316 * really wants to change the lease time *now*, they can go ahead and bring
3317 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3318 */
3319void
3320nfs4_reset_lease(time_t leasetime)
3321{
d99a05ad
N		 3322 lock_kernel();
3323 user_lease_time = leasetime;
3324 unlock_kernel();
1da177e4 3325}
Linux 6.x block layer and io_uring tree(s)