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locks: add lock cancel command
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
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1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
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{
27459f09 717 struct sockaddr_in *sin = svc_addr_in(rqstp);
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 751 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 752 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 753 dprintk("NFSD: setclientid: string in use by client"
754 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 755 goto out;
756 }
1da177e4 757 }
28ce6054 758 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 759 status = nfserr_resource;
760 if (!conf) {
761 /*
762 * CASE 4:
763 * placed first, because it is the normal case.
764 */
765 if (unconf)
766 expire_client(unconf);
a55370a3
N		 767 new = create_client(clname, dname);
768 if (new == NULL)
1da177e4
LT		 769 goto out;
770 copy_verf(new, &clverifier);
27459f09 771 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 772 copy_cred(&new->cl_cred,&rqstp->rq_cred);
773 gen_clid(new);
774 gen_confirm(new);
775 gen_callback(new, setclid);
776 add_to_unconfirmed(new, strhashval);
777 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
778 /*
779 * CASE 1:
780 * cl_name match, confirmed, principal match
781 * verifier match: probable callback update
782 *
783 * remove any unconfirmed nfs4_client with
784 * matching cl_name, cl_verifier, and cl_clientid
785 *
786 * create and insert an unconfirmed nfs4_client with same
787 * cl_name, cl_verifier, and cl_clientid as existing
788 * nfs4_client, but with the new callback info and a
789 * new cl_confirm
790 */
31f4a6c1
N		 791 if (unconf) {
792 /* Note this is removing unconfirmed {*x***},
793 * which is stronger than RFC recommended {vxc**}.
794 * This has the advantage that there is at most
795 * one {*x***} in either list at any time.
796 */
797 expire_client(unconf);
1da177e4 798 }
a55370a3
N		 799 new = create_client(clname, dname);
800 if (new == NULL)
1da177e4
LT		 801 goto out;
802 copy_verf(new,&conf->cl_verifier);
27459f09 803 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 804 copy_cred(&new->cl_cred,&rqstp->rq_cred);
805 copy_clid(new, conf);
806 gen_confirm(new);
807 gen_callback(new, setclid);
808 add_to_unconfirmed(new,strhashval);
809 } else if (!unconf) {
810 /*
811 * CASE 2:
812 * clname match, confirmed, principal match
813 * verfier does not match
814 * no unconfirmed. create a new unconfirmed nfs4_client
815 * using input clverifier, clname, and callback info
816 * and generate a new cl_clientid and cl_confirm.
817 */
a55370a3
N		 818 new = create_client(clname, dname);
819 if (new == NULL)
1da177e4
LT		 820 goto out;
821 copy_verf(new,&clverifier);
27459f09 822 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 823 copy_cred(&new->cl_cred,&rqstp->rq_cred);
824 gen_clid(new);
825 gen_confirm(new);
826 gen_callback(new, setclid);
827 add_to_unconfirmed(new, strhashval);
828 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
829 /*
830 * CASE3:
831 * confirmed found (name, principal match)
832 * confirmed verifier does not match input clverifier
833 *
834 * unconfirmed found (name match)
835 * confirmed->cl_confirm != unconfirmed->cl_confirm
836 *
837 * remove unconfirmed.
838 *
839 * create an unconfirmed nfs4_client
840 * with same cl_name as existing confirmed nfs4_client,
841 * but with new callback info, new cl_clientid,
842 * new cl_verifier and a new cl_confirm
843 */
844 expire_client(unconf);
a55370a3
N		 845 new = create_client(clname, dname);
846 if (new == NULL)
1da177e4
LT		 847 goto out;
848 copy_verf(new,&clverifier);
27459f09 849 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 850 copy_cred(&new->cl_cred,&rqstp->rq_cred);
851 gen_clid(new);
852 gen_confirm(new);
853 gen_callback(new, setclid);
854 add_to_unconfirmed(new, strhashval);
855 } else {
856 /* No cases hit !!! */
857 status = nfserr_inval;
858 goto out;
859
860 }
861 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
862 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
863 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
864 status = nfs_ok;
865out:
866 nfs4_unlock_state();
867 return status;
868}
869
870
871/*
872 * RFC 3010 has a complex implmentation description of processing a
873 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
874 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
875 *
876 * NOTE: callback information will be processed here in a future patch
877 */
b37ad28b 878__be32
b591480b
BF		 879nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
880 struct nfsd4_compound_state *cstate,
881 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 882{
27459f09 883 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 884 struct nfs4_client *conf, *unconf;
1da177e4
LT		 885 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
886 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 887 __be32 status;
1da177e4
LT		 888
889 if (STALE_CLIENTID(clid))
890 return nfserr_stale_clientid;
891 /*
892 * XXX The Duplicate Request Cache (DRC) has been checked (??)
893 * We get here on a DRC miss.
894 */
895
896 nfs4_lock_state();
21ab45a4
N		 897
898 conf = find_confirmed_client(clid);
899 unconf = find_unconfirmed_client(clid);
900
901 status = nfserr_clid_inuse;
27459f09 902 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 903 goto out;
27459f09 904 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 905 goto out;
906
1da177e4
LT		 907 if ((conf && unconf) &&
908 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
909 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 910 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 911 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 912 /* CASE 1:
913 * unconf record that matches input clientid and input confirm.
914 * conf record that matches input clientid.
915 * conf and unconf records match names, verifiers
916 */
1da177e4
LT		 917 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
918 status = nfserr_clid_inuse;
919 else {
1a69c179
N		 920 /* XXX: We just turn off callbacks until we can handle
921 * change request correctly. */
cb36d634 922 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 923 gen_confirm(conf);
46309029 924 nfsd4_remove_clid_dir(unconf);
1a69c179 925 expire_client(unconf);
1da177e4 926 status = nfs_ok;
1a69c179 927
1da177e4 928 }
7c79f737 929 } else if ((conf && !unconf) ||
1da177e4
LT		 930 ((conf && unconf) &&
931 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 932 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 933 /* CASE 2:
934 * conf record that matches input clientid.
935 * if unconf record matches input clientid, then
936 * unconf->cl_name or unconf->cl_verifier don't match the
937 * conf record.
938 */
21ab45a4 939 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 940 status = nfserr_clid_inuse;
21ab45a4 941 else
1da177e4 942 status = nfs_ok;
7c79f737
N		 943 } else if (!conf && unconf
944 && cmp_verf(&unconf->cl_confirm, &confirm)) {
945 /* CASE 3:
946 * conf record not found.
947 * unconf record found.
948 * unconf->cl_confirm matches input confirm
949 */
1da177e4
LT		 950 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
951 status = nfserr_clid_inuse;
952 } else {
1a69c179
N		 953 unsigned int hash =
954 clientstr_hashval(unconf->cl_recdir);
955 conf = find_confirmed_client_by_str(unconf->cl_recdir,
956 hash);
957 if (conf) {
c7b9a459 958 nfsd4_remove_clid_dir(conf);
1a69c179
N		 959 expire_client(conf);
960 }
1da177e4 961 move_to_confirmed(unconf);
21ab45a4 962 conf = unconf;
1a69c179 963 status = nfs_ok;
1da177e4 964 }
7c79f737
N		 965 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
966 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
967 &confirm)))) {
968 /* CASE 4:
969 * conf record not found, or if conf, conf->cl_confirm does not
970 * match input confirm.
971 * unconf record not found, or if unconf, unconf->cl_confirm
972 * does not match input confirm.
973 */
1da177e4 974 status = nfserr_stale_clientid;
7c79f737 975 } else {
08e8987c
N		 976 /* check that we have hit one of the cases...*/
977 status = nfserr_clid_inuse;
978 }
1da177e4
LT		 979out:
980 if (!status)
21ab45a4 981 nfsd4_probe_callback(conf);
1da177e4
LT		 982 nfs4_unlock_state();
983 return status;
984}
985
1da177e4
LT		 986/* OPEN Share state helper functions */
987static inline struct nfs4_file *
988alloc_init_file(struct inode *ino)
989{
990 struct nfs4_file *fp;
991 unsigned int hashval = file_hashval(ino);
992
e60d4398
N		 993 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
994 if (fp) {
13cd2184 995 kref_init(&fp->fi_ref);
1da177e4 996 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 997 INIT_LIST_HEAD(&fp->fi_stateids);
998 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 999 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1000 fp->fi_inode = igrab(ino);
1001 fp->fi_id = current_fileid++;
1da177e4
LT		 1002 return fp;
1003 }
1004 return NULL;
1005}
1006
e60d4398 1007static void
e18b890b 1008nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1009{
e60d4398
N		 1010 if (*slab == NULL)
1011 return;
1a1d92c1 1012 kmem_cache_destroy(*slab);
e60d4398 1013 *slab = NULL;
1da177e4
LT		 1014}
1015
1016static void
1017nfsd4_free_slabs(void)
1018{
e60d4398
N		 1019 nfsd4_free_slab(&stateowner_slab);
1020 nfsd4_free_slab(&file_slab);
5ac049ac 1021 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1022 nfsd4_free_slab(&deleg_slab);
e60d4398 1023}
1da177e4 1024
e60d4398
N		 1025static int
1026nfsd4_init_slabs(void)
1027{
1028 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1029 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1030 if (stateowner_slab == NULL)
1031 goto out_nomem;
1032 file_slab = kmem_cache_create("nfsd4_files",
1033 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1034 if (file_slab == NULL)
1035 goto out_nomem;
5ac049ac
N		 1036 stateid_slab = kmem_cache_create("nfsd4_stateids",
1037 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1038 if (stateid_slab == NULL)
1039 goto out_nomem;
5b2d21c1
N		 1040 deleg_slab = kmem_cache_create("nfsd4_delegations",
1041 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1042 if (deleg_slab == NULL)
1043 goto out_nomem;
e60d4398
N		 1044 return 0;
1045out_nomem:
1046 nfsd4_free_slabs();
1047 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1048 return -ENOMEM;
1da177e4
LT		 1049}
1050
1051void
1052nfs4_free_stateowner(struct kref *kref)
1053{
1054 struct nfs4_stateowner *sop =
1055 container_of(kref, struct nfs4_stateowner, so_ref);
1056 kfree(sop->so_owner.data);
1057 kmem_cache_free(stateowner_slab, sop);
1058}
1059
1060static inline struct nfs4_stateowner *
1061alloc_stateowner(struct xdr_netobj *owner)
1062{
1063 struct nfs4_stateowner *sop;
1064
1065 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1066 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1067 memcpy(sop->so_owner.data, owner->data, owner->len);
1068 sop->so_owner.len = owner->len;
1069 kref_init(&sop->so_ref);
1070 return sop;
1071 }
1072 kmem_cache_free(stateowner_slab, sop);
1073 }
1074 return NULL;
1075}
1076
1077static struct nfs4_stateowner *
1078alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1079 struct nfs4_stateowner *sop;
1080 struct nfs4_replay *rp;
1081 unsigned int idhashval;
1082
1083 if (!(sop = alloc_stateowner(&open->op_owner)))
1084 return NULL;
1085 idhashval = ownerid_hashval(current_ownerid);
1086 INIT_LIST_HEAD(&sop->so_idhash);
1087 INIT_LIST_HEAD(&sop->so_strhash);
1088 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1089 INIT_LIST_HEAD(&sop->so_stateids);
1090 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1091 INIT_LIST_HEAD(&sop->so_close_lru);
1092 sop->so_time = 0;
1093 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1094 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1095 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1096 sop->so_is_open_owner = 1;
1097 sop->so_id = current_ownerid++;
1098 sop->so_client = clp;
1099 sop->so_seqid = open->op_seqid;
1100 sop->so_confirmed = 0;
1101 rp = &sop->so_replay;
de1ae286 1102 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1103 rp->rp_buflen = 0;
1104 rp->rp_buf = rp->rp_ibuf;
1105 return sop;
1106}
1107
1108static void
1109release_stateid_lockowners(struct nfs4_stateid *open_stp)
1110{
1111 struct nfs4_stateowner *lock_sop;
1112
ea1da636
N		 1113 while (!list_empty(&open_stp->st_lockowners)) {
1114 lock_sop = list_entry(open_stp->st_lockowners.next,
1115 struct nfs4_stateowner, so_perstateid);
1116 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1117 BUG_ON(lock_sop->so_is_open_owner);
1118 release_stateowner(lock_sop);
1119 }
1120}
1121
1122static void
1123unhash_stateowner(struct nfs4_stateowner *sop)
1124{
1125 struct nfs4_stateid *stp;
1126
1127 list_del(&sop->so_idhash);
1128 list_del(&sop->so_strhash);
6fa305de 1129 if (sop->so_is_open_owner)
1da177e4 1130 list_del(&sop->so_perclient);
ea1da636
N		 1131 list_del(&sop->so_perstateid);
1132 while (!list_empty(&sop->so_stateids)) {
1133 stp = list_entry(sop->so_stateids.next,
1134 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1135 if (sop->so_is_open_owner)
1136 release_stateid(stp, OPEN_STATE);
1137 else
1138 release_stateid(stp, LOCK_STATE);
1139 }
1140}
1141
1142static void
1143release_stateowner(struct nfs4_stateowner *sop)
1144{
1145 unhash_stateowner(sop);
1146 list_del(&sop->so_close_lru);
1147 nfs4_put_stateowner(sop);
1148}
1149
1150static inline void
1151init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1152 struct nfs4_stateowner *sop = open->op_stateowner;
1153 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1154
1155 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1156 INIT_LIST_HEAD(&stp->st_perstateowner);
1157 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1158 INIT_LIST_HEAD(&stp->st_perfile);
1159 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1160 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1161 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1162 stp->st_stateowner = sop;
13cd2184 1163 get_nfs4_file(fp);
1da177e4
LT		 1164 stp->st_file = fp;
1165 stp->st_stateid.si_boot = boot_time;
1166 stp->st_stateid.si_stateownerid = sop->so_id;
1167 stp->st_stateid.si_fileid = fp->fi_id;
1168 stp->st_stateid.si_generation = 0;
1169 stp->st_access_bmap = 0;
1170 stp->st_deny_bmap = 0;
1171 __set_bit(open->op_share_access, &stp->st_access_bmap);
1172 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1173 stp->st_openstp = NULL;
1da177e4
LT		 1174}
1175
1176static void
1177release_stateid(struct nfs4_stateid *stp, int flags)
1178{
1179 struct file *filp = stp->st_vfs_file;
1180
1181 list_del(&stp->st_hash);
1da177e4 1182 list_del(&stp->st_perfile);
ea1da636 1183 list_del(&stp->st_perstateowner);
1da177e4
LT		 1184 if (flags & OPEN_STATE) {
1185 release_stateid_lockowners(stp);
1186 stp->st_vfs_file = NULL;
1187 nfsd_close(filp);
1da177e4
LT		 1188 } else if (flags & LOCK_STATE)
1189 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1190 put_nfs4_file(stp->st_file);
5ac049ac 1191 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1192}
1193
fd39ca9a 1194static void
1da177e4
LT		 1195move_to_close_lru(struct nfs4_stateowner *sop)
1196{
1197 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1198
358dd55a 1199 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1200 sop->so_time = get_seconds();
1201}
1202
1da177e4
LT		 1203static int
1204cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1205 return ((sop->so_owner.len == owner->len) &&
1206 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1207 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1208}
1209
1210static struct nfs4_stateowner *
1211find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1212{
1213 struct nfs4_stateowner *so = NULL;
1214
1215 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1216 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1217 return so;
1218 }
1219 return NULL;
1220}
1221
1222/* search file_hashtbl[] for file */
1223static struct nfs4_file *
1224find_file(struct inode *ino)
1225{
1226 unsigned int hashval = file_hashval(ino);
1227 struct nfs4_file *fp;
1228
1229 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1230 if (fp->fi_inode == ino) {
1231 get_nfs4_file(fp);
1da177e4 1232 return fp;
13cd2184 1233 }
1da177e4
LT		 1234 }
1235 return NULL;
1236}
1237
ba5a6a19
BF		 1238static int access_valid(u32 x)
1239{
1240 return (x > 0 && x < 4);
1241}
1242
1243static int deny_valid(u32 x)
1244{
1245 return (x >= 0 && x < 5);
1246}
1da177e4 1247
fd39ca9a 1248static void
1da177e4
LT		 1249set_access(unsigned int *access, unsigned long bmap) {
1250 int i;
1251
1252 *access = 0;
1253 for (i = 1; i < 4; i++) {
1254 if (test_bit(i, &bmap))
1255 *access |= i;
1256 }
1257}
1258
fd39ca9a 1259static void
1da177e4
LT		 1260set_deny(unsigned int *deny, unsigned long bmap) {
1261 int i;
1262
1263 *deny = 0;
1264 for (i = 0; i < 4; i++) {
1265 if (test_bit(i, &bmap))
1266 *deny |= i ;
1267 }
1268}
1269
1270static int
1271test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1272 unsigned int access, deny;
1273
1274 set_access(&access, stp->st_access_bmap);
1275 set_deny(&deny, stp->st_deny_bmap);
1276 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1277 return 0;
1278 return 1;
1279}
1280
1281/*
1282 * Called to check deny when READ with all zero stateid or
1283 * WRITE with all zero or all one stateid
1284 */
b37ad28b 1285static __be32
1da177e4
LT		 1286nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1287{
1288 struct inode *ino = current_fh->fh_dentry->d_inode;
1289 struct nfs4_file *fp;
1290 struct nfs4_stateid *stp;
b37ad28b 1291 __be32 ret;
1da177e4
LT		 1292
1293 dprintk("NFSD: nfs4_share_conflict\n");
1294
1295 fp = find_file(ino);
13cd2184
N		 1296 if (!fp)
1297 return nfs_ok;
b700949b 1298 ret = nfserr_locked;
1da177e4 1299 /* Search for conflicting share reservations */
13cd2184
N		 1300 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1301 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1302 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1303 goto out;
1da177e4 1304 }
13cd2184
N		 1305 ret = nfs_ok;
1306out:
1307 put_nfs4_file(fp);
1308 return ret;
1da177e4
LT		 1309}
1310
1311static inline void
1312nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1313{
1314 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1315 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1316 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1317 }
1318}
1319
1320/*
1321 * Recall a delegation
1322 */
1323static int
1324do_recall(void *__dp)
1325{
1326 struct nfs4_delegation *dp = __dp;
1327
1328 daemonize("nfsv4-recall");
1329
1330 nfsd4_cb_recall(dp);
1331 return 0;
1332}
1333
1334/*
1335 * Spawn a thread to perform a recall on the delegation represented
1336 * by the lease (file_lock)
1337 *
1338 * Called from break_lease() with lock_kernel() held.
1339 * Note: we assume break_lease will only call this *once* for any given
1340 * lease.
1341 */
1342static
1343void nfsd_break_deleg_cb(struct file_lock *fl)
1344{
1345 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1346 struct task_struct *t;
1347
1348 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1349 if (!dp)
1350 return;
1351
1352 /* We're assuming the state code never drops its reference
1353 * without first removing the lease. Since we're in this lease
1354 * callback (and since the lease code is serialized by the kernel
1355 * lock) we know the server hasn't removed the lease yet, we know
1356 * it's safe to take a reference: */
1357 atomic_inc(&dp->dl_count);
1358
1359 spin_lock(&recall_lock);
1360 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1361 spin_unlock(&recall_lock);
1362
1363 /* only place dl_time is set. protected by lock_kernel*/
1364 dp->dl_time = get_seconds();
1365
1366 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1367 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1368
1369 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1370 if (IS_ERR(t)) {
1371 struct nfs4_client *clp = dp->dl_client;
1372
1373 printk(KERN_INFO "NFSD: Callback thread failed for "
1374 "for client (clientid %08x/%08x)\n",
1375 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1376 nfs4_put_delegation(dp);
1377 }
1378}
1379
1380/*
1381 * The file_lock is being reapd.
1382 *
1383 * Called by locks_free_lock() with lock_kernel() held.
1384 */
1385static
1386void nfsd_release_deleg_cb(struct file_lock *fl)
1387{
1388 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1389
1390 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1391
1392 if (!(fl->fl_flags & FL_LEASE) || !dp)
1393 return;
1394 dp->dl_flock = NULL;
1395}
1396
1397/*
1398 * Set the delegation file_lock back pointer.
1399 *
1400 * Called from __setlease() with lock_kernel() held.
1401 */
1402static
1403void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1404{
1405 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1406
1407 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1408 if (!dp)
1409 return;
1410 dp->dl_flock = new;
1411}
1412
1413/*
1414 * Called from __setlease() with lock_kernel() held
1415 */
1416static
1417int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1418{
1419 struct nfs4_delegation *onlistd =
1420 (struct nfs4_delegation *)onlist->fl_owner;
1421 struct nfs4_delegation *tryd =
1422 (struct nfs4_delegation *)try->fl_owner;
1423
1424 if (onlist->fl_lmops != try->fl_lmops)
1425 return 0;
1426
1427 return onlistd->dl_client == tryd->dl_client;
1428}
1429
1430
1431static
1432int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1433{
1434 if (arg & F_UNLCK)
1435 return lease_modify(onlist, arg);
1436 else
1437 return -EAGAIN;
1438}
1439
fd39ca9a 1440static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1441 .fl_break = nfsd_break_deleg_cb,
1442 .fl_release_private = nfsd_release_deleg_cb,
1443 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1444 .fl_mylease = nfsd_same_client_deleg_cb,
1445 .fl_change = nfsd_change_deleg_cb,
1446};
1447
1448
b37ad28b 1449__be32
1da177e4
LT		 1450nfsd4_process_open1(struct nfsd4_open *open)
1451{
1da177e4
LT		 1452 clientid_t *clientid = &open->op_clientid;
1453 struct nfs4_client *clp = NULL;
1454 unsigned int strhashval;
1455 struct nfs4_stateowner *sop = NULL;
1456
1da177e4 1457 if (!check_name(open->op_owner))
0f442aa2 1458 return nfserr_inval;
1da177e4
LT		 1459
1460 if (STALE_CLIENTID(&open->op_clientid))
1461 return nfserr_stale_clientid;
1462
1463 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1464 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1465 open->op_stateowner = sop;
1466 if (!sop) {
1467 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1468 clp = find_confirmed_client(clientid);
1469 if (clp == NULL)
0f442aa2
BF		 1470 return nfserr_expired;
1471 goto renew;
1da177e4 1472 }
0f442aa2
BF		 1473 if (!sop->so_confirmed) {
1474 /* Replace unconfirmed owners without checking for replay. */
1475 clp = sop->so_client;
1476 release_stateowner(sop);
1477 open->op_stateowner = NULL;
1478 goto renew;
1479 }
1480 if (open->op_seqid == sop->so_seqid - 1) {
1481 if (sop->so_replay.rp_buflen)
a90b061c 1482 return nfserr_replay_me;
0f442aa2
BF		 1483 /* The original OPEN failed so spectacularly
1484 * that we don't even have replay data saved!
1485 * Therefore, we have no choice but to continue
1486 * processing this OPEN; presumably, we'll
1487 * fail again for the same reason.
1488 */
1489 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1490 goto renew;
1491 }
1492 if (open->op_seqid != sop->so_seqid)
1493 return nfserr_bad_seqid;
1da177e4 1494renew:
0f442aa2
BF		 1495 if (open->op_stateowner == NULL) {
1496 sop = alloc_init_open_stateowner(strhashval, clp, open);
1497 if (sop == NULL)
1498 return nfserr_resource;
1499 open->op_stateowner = sop;
1500 }
1501 list_del_init(&sop->so_close_lru);
1da177e4 1502 renew_client(sop->so_client);
0f442aa2 1503 return nfs_ok;
1da177e4
LT		 1504}
1505
b37ad28b 1506static inline __be32
4a6e43e6
N		 1507nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1508{
1509 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1510 return nfserr_openmode;
1511 else
1512 return nfs_ok;
1513}
1514
52f4fb43
N		 1515static struct nfs4_delegation *
1516find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1517{
1518 struct nfs4_delegation *dp;
1519
ea1da636 1520 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1521 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1522 return dp;
1523 }
1524 return NULL;
1525}
1526
b37ad28b 1527static __be32
567d9829
N		 1528nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1529 struct nfs4_delegation **dp)
1530{
1531 int flags;
b37ad28b 1532 __be32 status = nfserr_bad_stateid;
567d9829
N		 1533
1534 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1535 if (*dp == NULL)
c44c5eeb 1536 goto out;
567d9829
N		 1537 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1538 RD_STATE : WR_STATE;
1539 status = nfs4_check_delegmode(*dp, flags);
1540 if (status)
1541 *dp = NULL;
c44c5eeb
N		 1542out:
1543 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1544 return nfs_ok;
1545 if (status)
1546 return status;
1547 open->op_stateowner->so_confirmed = 1;
1548 return nfs_ok;
567d9829
N		 1549}
1550
b37ad28b 1551static __be32
1da177e4
LT		 1552nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1553{
1554 struct nfs4_stateid *local;
b37ad28b 1555 __be32 status = nfserr_share_denied;
1da177e4
LT		 1556 struct nfs4_stateowner *sop = open->op_stateowner;
1557
8beefa24 1558 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1559 /* ignore lock owners */
1560 if (local->st_stateowner->so_is_open_owner == 0)
1561 continue;
1562 /* remember if we have seen this open owner */
1563 if (local->st_stateowner == sop)
1564 *stpp = local;
1565 /* check for conflicting share reservations */
1566 if (!test_share(local, open))
1567 goto out;
1568 }
1569 status = 0;
1570out:
1571 return status;
1572}
1573
5ac049ac
N		 1574static inline struct nfs4_stateid *
1575nfs4_alloc_stateid(void)
1576{
1577 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1578}
1579
b37ad28b 1580static __be32
1da177e4 1581nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1582 struct nfs4_delegation *dp,
1da177e4
LT		 1583 struct svc_fh *cur_fh, int flags)
1584{
1585 struct nfs4_stateid *stp;
1da177e4 1586
5ac049ac 1587 stp = nfs4_alloc_stateid();
1da177e4
LT		 1588 if (stp == NULL)
1589 return nfserr_resource;
1590
567d9829
N		 1591 if (dp) {
1592 get_file(dp->dl_vfs_file);
1593 stp->st_vfs_file = dp->dl_vfs_file;
1594 } else {
b37ad28b 1595 __be32 status;
567d9829
N		 1596 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1597 &stp->st_vfs_file);
1598 if (status) {
1599 if (status == nfserr_dropit)
1600 status = nfserr_jukebox;
5ac049ac 1601 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1602 return status;
1603 }
1da177e4 1604 }
1da177e4
LT		 1605 *stpp = stp;
1606 return 0;
1607}
1608
b37ad28b 1609static inline __be32
1da177e4
LT		 1610nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1611 struct nfsd4_open *open)
1612{
1613 struct iattr iattr = {
1614 .ia_valid = ATTR_SIZE,
1615 .ia_size = 0,
1616 };
1617 if (!open->op_truncate)
1618 return 0;
1619 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1620 return nfserr_inval;
1da177e4
LT		 1621 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1622}
1623
b37ad28b 1624static __be32
1da177e4
LT		 1625nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1626{
1627 struct file *filp = stp->st_vfs_file;
7eaa36e2 1628 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1629 unsigned int share_access, new_writer;
b37ad28b 1630 __be32 status;
1da177e4
LT		 1631
1632 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1633 new_writer = (~share_access) & open->op_share_access
1634 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1635
6c26d08f 1636 if (new_writer) {
b37ad28b
AV		 1637 int err = get_write_access(inode);
1638 if (err)
1639 return nfserrno(err);
6c26d08f 1640 }
1da177e4
LT		 1641 status = nfsd4_truncate(rqstp, cur_fh, open);
1642 if (status) {
6c26d08f
BF		 1643 if (new_writer)
1644 put_write_access(inode);
1da177e4
LT		 1645 return status;
1646 }
1647 /* remember the open */
6c26d08f 1648 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1649 set_bit(open->op_share_access, &stp->st_access_bmap);
1650 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1651
1652 return nfs_ok;
1653}
1654
1655
1da177e4 1656static void
37515177 1657nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1658{
37515177
N		 1659 open->op_stateowner->so_confirmed = 1;
1660 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1661}
1662
1663/*
1664 * Attempt to hand out a delegation.
1665 */
1666static void
1667nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1668{
1669 struct nfs4_delegation *dp;
1670 struct nfs4_stateowner *sop = stp->st_stateowner;
1671 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1672 struct file_lock fl, *flp = &fl;
1673 int status, flag = 0;
1674
1675 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1676 open->op_recall = 0;
1677 switch (open->op_claim_type) {
1678 case NFS4_OPEN_CLAIM_PREVIOUS:
1679 if (!atomic_read(&cb->cb_set))
1680 open->op_recall = 1;
1681 flag = open->op_delegate_type;
1682 if (flag == NFS4_OPEN_DELEGATE_NONE)
1683 goto out;
1684 break;
1685 case NFS4_OPEN_CLAIM_NULL:
1686 /* Let's not give out any delegations till everyone's
1687 * had the chance to reclaim theirs.... */
1688 if (nfs4_in_grace())
1689 goto out;
1690 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1691 goto out;
1692 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1693 flag = NFS4_OPEN_DELEGATE_WRITE;
1694 else
1695 flag = NFS4_OPEN_DELEGATE_READ;
1696 break;
1697 default:
1698 goto out;
1699 }
1da177e4
LT		 1700
1701 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1702 if (dp == NULL) {
1703 flag = NFS4_OPEN_DELEGATE_NONE;
1704 goto out;
1705 }
1706 locks_init_lock(&fl);
1707 fl.fl_lmops = &nfsd_lease_mng_ops;
1708 fl.fl_flags = FL_LEASE;
1709 fl.fl_end = OFFSET_MAX;
1710 fl.fl_owner = (fl_owner_t)dp;
1711 fl.fl_file = stp->st_vfs_file;
1712 fl.fl_pid = current->tgid;
1713
1714 /* setlease checks to see if delegation should be handed out.
1715 * the lock_manager callbacks fl_mylease and fl_change are used
1716 */
1717 if ((status = setlease(stp->st_vfs_file,
1718 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1719 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1720 unhash_delegation(dp);
1da177e4
LT		 1721 flag = NFS4_OPEN_DELEGATE_NONE;
1722 goto out;
1723 }
1724
1725 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1726
1727 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1728 dp->dl_stateid.si_boot,
1729 dp->dl_stateid.si_stateownerid,
1730 dp->dl_stateid.si_fileid,
1731 dp->dl_stateid.si_generation);
1732out:
7b190fec
N		 1733 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1734 && flag == NFS4_OPEN_DELEGATE_NONE
1735 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1736 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1737 open->op_delegate_type = flag;
1738}
1739
1740/*
1741 * called with nfs4_lock_state() held.
1742 */
b37ad28b 1743__be32
1da177e4
LT		 1744nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1745{
1746 struct nfs4_file *fp = NULL;
1747 struct inode *ino = current_fh->fh_dentry->d_inode;
1748 struct nfs4_stateid *stp = NULL;
567d9829 1749 struct nfs4_delegation *dp = NULL;
b37ad28b 1750 __be32 status;
1da177e4
LT		 1751
1752 status = nfserr_inval;
ba5a6a19
BF		 1753 if (!access_valid(open->op_share_access)
1754 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1755 goto out;
1756 /*
1757 * Lookup file; if found, lookup stateid and check open request,
1758 * and check for delegations in the process of being recalled.
1759 * If not found, create the nfs4_file struct
1760 */
1761 fp = find_file(ino);
1762 if (fp) {
1763 if ((status = nfs4_check_open(fp, open, &stp)))
1764 goto out;
c44c5eeb
N		 1765 status = nfs4_check_deleg(fp, open, &dp);
1766 if (status)
1767 goto out;
1da177e4 1768 } else {
c44c5eeb
N		 1769 status = nfserr_bad_stateid;
1770 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1771 goto out;
1da177e4
LT		 1772 status = nfserr_resource;
1773 fp = alloc_init_file(ino);
1774 if (fp == NULL)
1775 goto out;
1776 }
1777
1778 /*
1779 * OPEN the file, or upgrade an existing OPEN.
1780 * If truncate fails, the OPEN fails.
1781 */
1782 if (stp) {
1783 /* Stateid was found, this is an OPEN upgrade */
1784 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1785 if (status)
1786 goto out;
444c2c07 1787 update_stateid(&stp->st_stateid);
1da177e4
LT		 1788 } else {
1789 /* Stateid was not found, this is a new OPEN */
1790 int flags = 0;
9ecb6a08
BF		 1791 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1792 flags |= MAY_READ;
1da177e4 1793 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1794 flags |= MAY_WRITE;
567d9829
N		 1795 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1796 if (status)
1da177e4
LT		 1797 goto out;
1798 init_stateid(stp, fp, open);
1799 status = nfsd4_truncate(rqstp, current_fh, open);
1800 if (status) {
1801 release_stateid(stp, OPEN_STATE);
1802 goto out;
1803 }
1804 }
1805 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1806
1807 /*
1808 * Attempt to hand out a delegation. No error return, because the
1809 * OPEN succeeds even if we fail.
1810 */
1811 nfs4_open_delegation(current_fh, open, stp);
1812
1813 status = nfs_ok;
1814
1815 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1816 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1817 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1818out:
13cd2184
N		 1819 if (fp)
1820 put_nfs4_file(fp);
37515177
N		 1821 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1822 nfs4_set_claim_prev(open);
1da177e4
LT		 1823 /*
1824 * To finish the open response, we just need to set the rflags.
1825 */
1826 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1827 if (!open->op_stateowner->so_confirmed)
1828 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1829
1830 return status;
1831}
1832
58da282b 1833static struct workqueue_struct *laundry_wq;
c4028958
DH		 1834static void laundromat_main(struct work_struct *);
1835static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1836
b37ad28b 1837__be32
b591480b
BF		 1838nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1839 clientid_t *clid)
1da177e4
LT		 1840{
1841 struct nfs4_client *clp;
b37ad28b 1842 __be32 status;
1da177e4
LT		 1843
1844 nfs4_lock_state();
1845 dprintk("process_renew(%08x/%08x): starting\n",
1846 clid->cl_boot, clid->cl_id);
1847 status = nfserr_stale_clientid;
1848 if (STALE_CLIENTID(clid))
1849 goto out;
1850 clp = find_confirmed_client(clid);
1851 status = nfserr_expired;
1852 if (clp == NULL) {
1853 /* We assume the client took too long to RENEW. */
1854 dprintk("nfsd4_renew: clientid not found!\n");
1855 goto out;
1856 }
1857 renew_client(clp);
1858 status = nfserr_cb_path_down;
ea1da636 1859 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1860 && !atomic_read(&clp->cl_callback.cb_set))
1861 goto out;
1862 status = nfs_ok;
1863out:
1864 nfs4_unlock_state();
1865 return status;
1866}
1867
a76b4319
N		 1868static void
1869end_grace(void)
1870{
1871 dprintk("NFSD: end of grace period\n");
c7b9a459 1872 nfsd4_recdir_purge_old();
a76b4319
N		 1873 in_grace = 0;
1874}
1875
fd39ca9a 1876static time_t
1da177e4
LT		 1877nfs4_laundromat(void)
1878{
1879 struct nfs4_client *clp;
1880 struct nfs4_stateowner *sop;
1881 struct nfs4_delegation *dp;
1882 struct list_head *pos, *next, reaplist;
1883 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1884 time_t t, clientid_val = NFSD_LEASE_TIME;
1885 time_t u, test_val = NFSD_LEASE_TIME;
1886
1887 nfs4_lock_state();
1888
1889 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1890 if (in_grace)
1891 end_grace();
1da177e4
LT		 1892 list_for_each_safe(pos, next, &client_lru) {
1893 clp = list_entry(pos, struct nfs4_client, cl_lru);
1894 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1895 t = clp->cl_time - cutoff;
1896 if (clientid_val > t)
1897 clientid_val = t;
1898 break;
1899 }
1900 dprintk("NFSD: purging unused client (clientid %08x)\n",
1901 clp->cl_clientid.cl_id);
c7b9a459 1902 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1903 expire_client(clp);
1904 }
1905 INIT_LIST_HEAD(&reaplist);
1906 spin_lock(&recall_lock);
1907 list_for_each_safe(pos, next, &del_recall_lru) {
1908 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1909 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1910 u = dp->dl_time - cutoff;
1911 if (test_val > u)
1912 test_val = u;
1913 break;
1914 }
1915 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1916 dp, dp->dl_flock);
1917 list_move(&dp->dl_recall_lru, &reaplist);
1918 }
1919 spin_unlock(&recall_lock);
1920 list_for_each_safe(pos, next, &reaplist) {
1921 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1922 list_del_init(&dp->dl_recall_lru);
1923 unhash_delegation(dp);
1924 }
1925 test_val = NFSD_LEASE_TIME;
1926 list_for_each_safe(pos, next, &close_lru) {
1927 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1928 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1929 u = sop->so_time - cutoff;
1930 if (test_val > u)
1931 test_val = u;
1932 break;
1933 }
1934 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1935 sop->so_id);
358dd55a 1936 release_stateowner(sop);
1da177e4
LT		 1937 }
1938 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1939 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1940 nfs4_unlock_state();
1941 return clientid_val;
1942}
1943
1944void
c4028958 1945laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1946{
1947 time_t t;
1948
1949 t = nfs4_laundromat();
1950 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1951 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1952}
1953
fd39ca9a 1954static struct nfs4_stateowner *
f8816512
N		 1955search_close_lru(u32 st_id, int flags)
1956{
1da177e4
LT		 1957 struct nfs4_stateowner *local = NULL;
1958
1da177e4
LT		 1959 if (flags & CLOSE_STATE) {
1960 list_for_each_entry(local, &close_lru, so_close_lru) {
1961 if (local->so_id == st_id)
1962 return local;
1963 }
1964 }
1965 return NULL;
1966}
1967
1968static inline int
1969nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1970{
7eaa36e2 1971 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1972}
1973
1974static int
1975STALE_STATEID(stateid_t *stateid)
1976{
1977 if (stateid->si_boot == boot_time)
1978 return 0;
849823c5 1979 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1980 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1981 stateid->si_generation);
1982 return 1;
1983}
1984
1985static inline int
1986access_permit_read(unsigned long access_bmap)
1987{
1988 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1989 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1990 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1991}
1992
1993static inline int
1994access_permit_write(unsigned long access_bmap)
1995{
1996 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1997 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1998}
1999
2000static
b37ad28b 2001__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2002{
b37ad28b 2003 __be32 status = nfserr_openmode;
1da177e4
LT		 2004
2005 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2006 goto out;
2007 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2008 goto out;
2009 status = nfs_ok;
2010out:
2011 return status;
2012}
2013
b37ad28b 2014static inline __be32
1da177e4
LT		 2015check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2016{
2017 /* Trying to call delegreturn with a special stateid? Yuch: */
2018 if (!(flags & (RD_STATE | WR_STATE)))
2019 return nfserr_bad_stateid;
2020 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2021 return nfs_ok;
2022 else if (nfs4_in_grace()) {
2023 /* Answer in remaining cases depends on existance of
2024 * conflicting state; so we must wait out the grace period. */
2025 return nfserr_grace;
2026 } else if (flags & WR_STATE)
2027 return nfs4_share_conflict(current_fh,
2028 NFS4_SHARE_DENY_WRITE);
2029 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2030 return nfs4_share_conflict(current_fh,
2031 NFS4_SHARE_DENY_READ);
2032}
2033
2034/*
2035 * Allow READ/WRITE during grace period on recovered state only for files
2036 * that are not able to provide mandatory locking.
2037 */
2038static inline int
2039io_during_grace_disallowed(struct inode *inode, int flags)
2040{
2041 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2042 && MANDATORY_LOCK(inode);
2043}
2044
2045/*
2046* Checks for stateid operations
2047*/
b37ad28b 2048__be32
1da177e4
LT		 2049nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2050{
2051 struct nfs4_stateid *stp = NULL;
2052 struct nfs4_delegation *dp = NULL;
2053 stateid_t *stidp;
2054 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2055 __be32 status;
1da177e4
LT		 2056
2057 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2058 stateid->si_boot, stateid->si_stateownerid,
2059 stateid->si_fileid, stateid->si_generation);
2060 if (filpp)
2061 *filpp = NULL;
2062
2063 if (io_during_grace_disallowed(ino, flags))
2064 return nfserr_grace;
2065
2066 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2067 return check_special_stateids(current_fh, stateid, flags);
2068
2069 /* STALE STATEID */
2070 status = nfserr_stale_stateid;
2071 if (STALE_STATEID(stateid))
2072 goto out;
2073
2074 /* BAD STATEID */
2075 status = nfserr_bad_stateid;
2076 if (!stateid->si_fileid) { /* delegation stateid */
2077 if(!(dp = find_delegation_stateid(ino, stateid))) {
2078 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2079 goto out;
2080 }
2081 stidp = &dp->dl_stateid;
2082 } else { /* open or lock stateid */
2083 if (!(stp = find_stateid(stateid, flags))) {
2084 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2085 goto out;
2086 }
2087 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2088 goto out;
2089 if (!stp->st_stateowner->so_confirmed)
2090 goto out;
2091 stidp = &stp->st_stateid;
2092 }
2093 if (stateid->si_generation > stidp->si_generation)
2094 goto out;
2095
2096 /* OLD STATEID */
2097 status = nfserr_old_stateid;
2098 if (stateid->si_generation < stidp->si_generation)
2099 goto out;
2100 if (stp) {
2101 if ((status = nfs4_check_openmode(stp,flags)))
2102 goto out;
2103 renew_client(stp->st_stateowner->so_client);
2104 if (filpp)
2105 *filpp = stp->st_vfs_file;
2106 } else if (dp) {
2107 if ((status = nfs4_check_delegmode(dp, flags)))
2108 goto out;
2109 renew_client(dp->dl_client);
2110 if (flags & DELEG_RET)
2111 unhash_delegation(dp);
2112 if (filpp)
2113 *filpp = dp->dl_vfs_file;
2114 }
2115 status = nfs_ok;
2116out:
2117 return status;
2118}
2119
4c4cd222
N		 2120static inline int
2121setlkflg (int type)
2122{
2123 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2124 RD_STATE : WR_STATE;
2125}
1da177e4
LT		 2126
2127/*
2128 * Checks for sequence id mutating operations.
2129 */
b37ad28b 2130static __be32
4c4cd222 2131nfs4_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 2132{
1da177e4
LT		 2133 struct nfs4_stateid *stp;
2134 struct nfs4_stateowner *sop;
2135
2136 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2137 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2138 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2139 stateid->si_generation);
3a4f98bb 2140
1da177e4
LT		 2141 *stpp = NULL;
2142 *sopp = NULL;
2143
1da177e4
LT		 2144 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2145 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2146 return nfserr_bad_stateid;
1da177e4
LT		 2147 }
2148
1da177e4 2149 if (STALE_STATEID(stateid))
3a4f98bb 2150 return nfserr_stale_stateid;
1da177e4
LT		 2151 /*
2152 * We return BAD_STATEID if filehandle doesn't match stateid,
2153 * the confirmed flag is incorrecly set, or the generation
2154 * number is incorrect.
1da177e4 2155 */
f8816512
N		 2156 stp = find_stateid(stateid, flags);
2157 if (stp == NULL) {
2158 /*
2159 * Also, we should make sure this isn't just the result of
2160 * a replayed close:
2161 */
2162 sop = search_close_lru(stateid->si_stateownerid, flags);
2163 if (sop == NULL)
2164 return nfserr_bad_stateid;
2165 *sopp = sop;
2166 goto check_replay;
2167 }
1da177e4 2168
4c4cd222 2169 if (lock) {
1da177e4 2170 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2171 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2172 struct nfs4_client *clp = sop->so_client;
4c4cd222 2173 int lkflg = 0;
b37ad28b 2174 __be32 status;
4c4cd222
N		 2175
2176 lkflg = setlkflg(lock->lk_type);
2177
2178 if (lock->lk_is_new) {
2179 if (!sop->so_is_open_owner)
2180 return nfserr_bad_stateid;
2181 if (!cmp_clid(&clp->cl_clientid, lockclid))
2182 return nfserr_bad_stateid;
2183 /* stp is the open stateid */
2184 status = nfs4_check_openmode(stp, lkflg);
2185 if (status)
2186 return status;
2187 } else {
2188 /* stp is the lock stateid */
2189 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2190 if (status)
2191 return status;
2192 }
1da177e4 2193
1da177e4
LT		 2194 }
2195
2196 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2197 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2198 return nfserr_bad_stateid;
1da177e4
LT		 2199 }
2200
2201 *stpp = stp;
2202 *sopp = sop = stp->st_stateowner;
2203
2204 /*
2205 * We now validate the seqid and stateid generation numbers.
2206 * For the moment, we ignore the possibility of
2207 * generation number wraparound.
2208 */
bd9aac52 2209 if (seqid != sop->so_seqid)
1da177e4
LT		 2210 goto check_replay;
2211
3a4f98bb
N		 2212 if (sop->so_confirmed && flags & CONFIRM) {
2213 printk("NFSD: preprocess_seqid_op: expected"
2214 " unconfirmed stateowner!\n");
2215 return nfserr_bad_stateid;
1da177e4 2216 }
3a4f98bb
N		 2217 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2218 printk("NFSD: preprocess_seqid_op: stateowner not"
2219 " confirmed yet!\n");
2220 return nfserr_bad_stateid;
1da177e4
LT		 2221 }
2222 if (stateid->si_generation > stp->st_stateid.si_generation) {
2223 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2224 return nfserr_bad_stateid;
1da177e4
LT		 2225 }
2226
1da177e4
LT		 2227 if (stateid->si_generation < stp->st_stateid.si_generation) {
2228 printk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2229 return nfserr_old_stateid;
1da177e4 2230 }
52fd004e 2231 renew_client(sop->so_client);
3a4f98bb 2232 return nfs_ok;
1da177e4 2233
1da177e4 2234check_replay:
bd9aac52 2235 if (seqid == sop->so_seqid - 1) {
849823c5 2236 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2237 /* indicate replay to calling function */
a90b061c 2238 return nfserr_replay_me;
1da177e4 2239 }
3a4f98bb
N		 2240 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2241 sop->so_seqid, seqid);
2242 *sopp = NULL;
2243 return nfserr_bad_seqid;
1da177e4
LT		 2244}
2245
b37ad28b 2246__be32
ca364317 2247nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2248 struct nfsd4_open_confirm *oc)
1da177e4 2249{
b37ad28b 2250 __be32 status;
1da177e4
LT		 2251 struct nfs4_stateowner *sop;
2252 struct nfs4_stateid *stp;
2253
2254 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2255 (int)cstate->current_fh.fh_dentry->d_name.len,
2256 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2257
ca364317 2258 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2259 if (status)
2260 return status;
1da177e4
LT		 2261
2262 nfs4_lock_state();
2263
ca364317
BF		 2264 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2265 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2266 CHECK_FH | CONFIRM | OPEN_STATE,
2267 &oc->oc_stateowner, &stp, NULL)))
2268 goto out;
2269
2270 sop = oc->oc_stateowner;
2271 sop->so_confirmed = 1;
2272 update_stateid(&stp->st_stateid);
2273 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2274 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2275 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2276 stp->st_stateid.si_boot,
2277 stp->st_stateid.si_stateownerid,
2278 stp->st_stateid.si_fileid,
2279 stp->st_stateid.si_generation);
c7b9a459
N		 2280
2281 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2282out:
f2327d9a 2283 if (oc->oc_stateowner) {
1da177e4 2284 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2285 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2286 }
1da177e4
LT		 2287 nfs4_unlock_state();
2288 return status;
2289}
2290
2291
2292/*
2293 * unset all bits in union bitmap (bmap) that
2294 * do not exist in share (from successful OPEN_DOWNGRADE)
2295 */
2296static void
2297reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2298{
2299 int i;
2300 for (i = 1; i < 4; i++) {
2301 if ((i & access) != i)
2302 __clear_bit(i, bmap);
2303 }
2304}
2305
2306static void
2307reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2308{
2309 int i;
2310 for (i = 0; i < 4; i++) {
2311 if ((i & deny) != i)
2312 __clear_bit(i, bmap);
2313 }
2314}
2315
b37ad28b 2316__be32
ca364317
BF		 2317nfsd4_open_downgrade(struct svc_rqst *rqstp,
2318 struct nfsd4_compound_state *cstate,
a4f1706a 2319 struct nfsd4_open_downgrade *od)
1da177e4 2320{
b37ad28b 2321 __be32 status;
1da177e4
LT		 2322 struct nfs4_stateid *stp;
2323 unsigned int share_access;
2324
2325 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2326 (int)cstate->current_fh.fh_dentry->d_name.len,
2327 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2328
ba5a6a19
BF		 2329 if (!access_valid(od->od_share_access)
2330 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2331 return nfserr_inval;
2332
2333 nfs4_lock_state();
ca364317
BF		 2334 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2335 od->od_seqid,
1da177e4
LT		 2336 &od->od_stateid,
2337 CHECK_FH | OPEN_STATE,
2338 &od->od_stateowner, &stp, NULL)))
2339 goto out;
2340
2341 status = nfserr_inval;
2342 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2343 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2344 stp->st_access_bmap, od->od_share_access);
2345 goto out;
2346 }
2347 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2348 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2349 stp->st_deny_bmap, od->od_share_deny);
2350 goto out;
2351 }
2352 set_access(&share_access, stp->st_access_bmap);
2353 nfs4_file_downgrade(stp->st_vfs_file,
2354 share_access & ~od->od_share_access);
2355
2356 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2357 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2358
2359 update_stateid(&stp->st_stateid);
2360 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2361 status = nfs_ok;
2362out:
f2327d9a 2363 if (od->od_stateowner) {
1da177e4 2364 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2365 cstate->replay_owner = od->od_stateowner;
f2327d9a 2366 }
1da177e4
LT		 2367 nfs4_unlock_state();
2368 return status;
2369}
2370
2371/*
2372 * nfs4_unlock_state() called after encode
2373 */
b37ad28b 2374__be32
ca364317 2375nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2376 struct nfsd4_close *close)
1da177e4 2377{
b37ad28b 2378 __be32 status;
1da177e4
LT		 2379 struct nfs4_stateid *stp;
2380
2381 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2382 (int)cstate->current_fh.fh_dentry->d_name.len,
2383 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2384
2385 nfs4_lock_state();
2386 /* check close_lru for replay */
ca364317
BF		 2387 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2388 close->cl_seqid,
1da177e4
LT		 2389 &close->cl_stateid,
2390 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2391 &close->cl_stateowner, &stp, NULL)))
2392 goto out;
1da177e4
LT		 2393 status = nfs_ok;
2394 update_stateid(&stp->st_stateid);
2395 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2396
04ef5954
BF		 2397 /* release_stateid() calls nfsd_close() if needed */
2398 release_stateid(stp, OPEN_STATE);
2399
2400 /* place unused nfs4_stateowners on so_close_lru list to be
2401 * released by the laundromat service after the lease period
2402 * to enable us to handle CLOSE replay
2403 */
2404 if (list_empty(&close->cl_stateowner->so_stateids))
2405 move_to_close_lru(close->cl_stateowner);
1da177e4 2406out:
f2327d9a 2407 if (close->cl_stateowner) {
1da177e4 2408 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2409 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2410 }
1da177e4
LT		 2411 nfs4_unlock_state();
2412 return status;
2413}
2414
b37ad28b 2415__be32
ca364317
BF		 2416nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2417 struct nfsd4_delegreturn *dr)
1da177e4 2418{
b37ad28b 2419 __be32 status;
1da177e4 2420
ca364317 2421 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2422 goto out;
2423
2424 nfs4_lock_state();
ca364317
BF		 2425 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2426 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2427 nfs4_unlock_state();
2428out:
2429 return status;
2430}
2431
2432
2433/*
2434 * Lock owner state (byte-range locks)
2435 */
2436#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2437#define LOCK_HASH_BITS 8
2438#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2439#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2440
2441#define lockownerid_hashval(id) \
2442 ((id) & LOCK_HASH_MASK)
2443
2444static inline unsigned int
2445lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2446 struct xdr_netobj *ownername)
2447{
2448 return (file_hashval(inode) + cl_id
2449 + opaque_hashval(ownername->data, ownername->len))
2450 & LOCK_HASH_MASK;
2451}
2452
2453static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2454static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2455static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2456
fd39ca9a 2457static struct nfs4_stateid *
1da177e4
LT		 2458find_stateid(stateid_t *stid, int flags)
2459{
2460 struct nfs4_stateid *local = NULL;
2461 u32 st_id = stid->si_stateownerid;
2462 u32 f_id = stid->si_fileid;
2463 unsigned int hashval;
2464
2465 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2466 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2467 hashval = stateid_hashval(st_id, f_id);
2468 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2469 if ((local->st_stateid.si_stateownerid == st_id) &&
2470 (local->st_stateid.si_fileid == f_id))
2471 return local;
2472 }
2473 }
2474 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2475 hashval = stateid_hashval(st_id, f_id);
2476 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2477 if ((local->st_stateid.si_stateownerid == st_id) &&
2478 (local->st_stateid.si_fileid == f_id))
2479 return local;
2480 }
849823c5 2481 }
1da177e4
LT		 2482 return NULL;
2483}
2484
2485static struct nfs4_delegation *
2486find_delegation_stateid(struct inode *ino, stateid_t *stid)
2487{
13cd2184
N		 2488 struct nfs4_file *fp;
2489 struct nfs4_delegation *dl;
1da177e4
LT		 2490
2491 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2492 stid->si_boot, stid->si_stateownerid,
2493 stid->si_fileid, stid->si_generation);
2494
1da177e4 2495 fp = find_file(ino);
13cd2184
N		 2496 if (!fp)
2497 return NULL;
2498 dl = find_delegation_file(fp, stid);
2499 put_nfs4_file(fp);
2500 return dl;
1da177e4
LT		 2501}
2502
2503/*
2504 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2505 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2506 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2507 * locking, this prevents us from being completely protocol-compliant. The
2508 * real solution to this problem is to start using unsigned file offsets in
2509 * the VFS, but this is a very deep change!
2510 */
2511static inline void
2512nfs4_transform_lock_offset(struct file_lock *lock)
2513{
2514 if (lock->fl_start < 0)
2515 lock->fl_start = OFFSET_MAX;
2516 if (lock->fl_end < 0)
2517 lock->fl_end = OFFSET_MAX;
2518}
2519
d5b9026a
N		 2520/* Hack!: For now, we're defining this just so we can use a pointer to it
2521 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2522static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2523};
1da177e4
LT		 2524
2525static inline void
2526nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2527{
d5b9026a
N		 2528 struct nfs4_stateowner *sop;
2529 unsigned int hval;
1da177e4 2530
d5b9026a
N		 2531 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2532 sop = (struct nfs4_stateowner *) fl->fl_owner;
2533 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2534 kref_get(&sop->so_ref);
2535 deny->ld_sop = sop;
2536 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2537 } else {
2538 deny->ld_sop = NULL;
2539 deny->ld_clientid.cl_boot = 0;
2540 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2541 }
2542 deny->ld_start = fl->fl_start;
2543 deny->ld_length = ~(u64)0;
2544 if (fl->fl_end != ~(u64)0)
2545 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2546 deny->ld_type = NFS4_READ_LT;
2547 if (fl->fl_type != F_RDLCK)
2548 deny->ld_type = NFS4_WRITE_LT;
2549}
2550
1da177e4
LT		 2551static struct nfs4_stateowner *
2552find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2553 struct xdr_netobj *owner)
2554{
2555 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2556 struct nfs4_stateowner *op;
2557
2558 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2559 if (cmp_owner_str(op, owner, clid))
2560 return op;
2561 }
2562 return NULL;
2563}
2564
2565/*
2566 * Alloc a lock owner structure.
2567 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2568 * occured.
2569 *
2570 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2571 */
2572
2573static struct nfs4_stateowner *
2574alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2575 struct nfs4_stateowner *sop;
2576 struct nfs4_replay *rp;
2577 unsigned int idhashval;
2578
2579 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2580 return NULL;
2581 idhashval = lockownerid_hashval(current_ownerid);
2582 INIT_LIST_HEAD(&sop->so_idhash);
2583 INIT_LIST_HEAD(&sop->so_strhash);
2584 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2585 INIT_LIST_HEAD(&sop->so_stateids);
2586 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2587 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2588 sop->so_time = 0;
2589 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2590 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2591 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2592 sop->so_is_open_owner = 0;
2593 sop->so_id = current_ownerid++;
2594 sop->so_client = clp;
b59e3c0e
NB		 2595 /* It is the openowner seqid that will be incremented in encode in the
2596 * case of new lockowners; so increment the lock seqid manually: */
2597 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2598 sop->so_confirmed = 1;
2599 rp = &sop->so_replay;
de1ae286 2600 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2601 rp->rp_buflen = 0;
2602 rp->rp_buf = rp->rp_ibuf;
2603 return sop;
2604}
2605
fd39ca9a 2606static struct nfs4_stateid *
1da177e4
LT		 2607alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2608{
2609 struct nfs4_stateid *stp;
2610 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2611
5ac049ac
N		 2612 stp = nfs4_alloc_stateid();
2613 if (stp == NULL)
1da177e4
LT		 2614 goto out;
2615 INIT_LIST_HEAD(&stp->st_hash);
2616 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2617 INIT_LIST_HEAD(&stp->st_perstateowner);
2618 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2619 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2620 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2621 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2622 stp->st_stateowner = sop;
13cd2184 2623 get_nfs4_file(fp);
1da177e4
LT		 2624 stp->st_file = fp;
2625 stp->st_stateid.si_boot = boot_time;
2626 stp->st_stateid.si_stateownerid = sop->so_id;
2627 stp->st_stateid.si_fileid = fp->fi_id;
2628 stp->st_stateid.si_generation = 0;
2629 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2630 stp->st_access_bmap = open_stp->st_access_bmap;
2631 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2632 stp->st_openstp = open_stp;
1da177e4
LT		 2633
2634out:
2635 return stp;
2636}
2637
fd39ca9a 2638static int
1da177e4
LT		 2639check_lock_length(u64 offset, u64 length)
2640{
2641 return ((length == 0) || ((length != ~(u64)0) &&
2642 LOFF_OVERFLOW(offset, length)));
2643}
2644
2645/*
2646 * LOCK operation
2647 */
b37ad28b 2648__be32
ca364317 2649nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2650 struct nfsd4_lock *lock)
1da177e4 2651{
3e9e3dbe 2652 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2653 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2654 struct nfs4_stateid *lock_stp;
2655 struct file *filp;
2656 struct file_lock file_lock;
8dc7c311 2657 struct file_lock conflock;
b37ad28b 2658 __be32 status = 0;
1da177e4 2659 unsigned int strhashval;
150b3934 2660 unsigned int cmd;
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;
150b3934 2743 cmd = F_SETLK;
1da177e4
LT		 2744 break;
2745 case NFS4_WRITE_LT:
2746 case NFS4_WRITEW_LT:
2747 file_lock.fl_type = F_WRLCK;
150b3934 2748 cmd = F_SETLK;
1da177e4
LT		 2749 break;
2750 default:
2751 status = nfserr_inval;
2752 goto out;
2753 }
b59e3c0e 2754 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2755 file_lock.fl_pid = current->tgid;
2756 file_lock.fl_file = filp;
2757 file_lock.fl_flags = FL_POSIX;
d5b9026a 2758 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2759
2760 file_lock.fl_start = lock->lk_offset;
2761 if ((lock->lk_length == ~(u64)0) ||
2762 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2763 file_lock.fl_end = ~(u64)0;
2764 else
2765 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2766 nfs4_transform_lock_offset(&file_lock);
2767
2768 /*
2769 * Try to lock the file in the VFS.
2770 * Note: locks.c uses the BKL to protect the inode's lock list.
2771 */
2772
eb76b3fd
AA		 2773 /* XXX?: Just to divert the locks_release_private at the start of
2774 * locks_copy_lock: */
150b3934
ME		 2775 locks_init_lock(&conflock);
2776 err = posix_lock_file(filp, &file_lock, &conflock);
b8dd7b9a 2777 switch (-err) {
1da177e4
LT		 2778 case 0: /* success! */
2779 update_stateid(&lock_stp->st_stateid);
2780 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2781 sizeof(stateid_t));
b8dd7b9a 2782 status = 0;
eb76b3fd
AA		 2783 break;
2784 case (EAGAIN): /* conflock holds conflicting lock */
2785 status = nfserr_denied;
2786 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2787 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2788 break;
1da177e4
LT		 2789 case (EDEADLK):
2790 status = nfserr_deadlock;
eb76b3fd 2791 break;
1da177e4 2792 default:
b8dd7b9a 2793 dprintk("NFSD: nfsd4_lock: posix_lock_file_conf() failed! status %d\n",err);
eb76b3fd
AA		 2794 status = nfserr_resource;
2795 break;
1da177e4 2796 }
1da177e4 2797out:
8a280510
BF		 2798 if (status && lock->lk_is_new && lock_sop)
2799 release_stateowner(lock_sop);
3a65588a
BF		 2800 if (lock->lk_replay_owner) {
2801 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2802 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2803 }
1da177e4
LT		 2804 nfs4_unlock_state();
2805 return status;
2806}
2807
2808/*
2809 * LOCKT operation
2810 */
b37ad28b 2811__be32
ca364317
BF		 2812nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2813 struct nfsd4_lockt *lockt)
1da177e4
LT		 2814{
2815 struct inode *inode;
2816 struct file file;
2817 struct file_lock file_lock;
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;
9d6a8c5c
ME		 2882 posix_test_lock(&file, &file_lock);
2883 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2884 status = nfserr_denied;
9d6a8c5c 2885 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2886 }
2887out:
2888 nfs4_unlock_state();
2889 return status;
2890}
2891
b37ad28b 2892__be32
ca364317 2893nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2894 struct nfsd4_locku *locku)
1da177e4
LT		 2895{
2896 struct nfs4_stateid *stp;
2897 struct file *filp = NULL;
2898 struct file_lock file_lock;
b37ad28b 2899 __be32 status;
b8dd7b9a 2900 int err;
1da177e4
LT		 2901
2902 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2903 (long long) locku->lu_offset,
2904 (long long) locku->lu_length);
2905
2906 if (check_lock_length(locku->lu_offset, locku->lu_length))
2907 return nfserr_inval;
2908
2909 nfs4_lock_state();
2910
ca364317 2911 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2912 locku->lu_seqid,
2913 &locku->lu_stateid,
2914 CHECK_FH | LOCK_STATE,
2915 &locku->lu_stateowner, &stp, NULL)))
2916 goto out;
2917
2918 filp = stp->st_vfs_file;
2919 BUG_ON(!filp);
2920 locks_init_lock(&file_lock);
2921 file_lock.fl_type = F_UNLCK;
2922 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2923 file_lock.fl_pid = current->tgid;
2924 file_lock.fl_file = filp;
2925 file_lock.fl_flags = FL_POSIX;
d5b9026a 2926 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2927 file_lock.fl_start = locku->lu_offset;
2928
2929 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2930 file_lock.fl_end = ~(u64)0;
2931 else
2932 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2933 nfs4_transform_lock_offset(&file_lock);
2934
2935 /*
2936 * Try to unlock the file in the VFS.
2937 */
150b3934 2938 err = posix_lock_file(filp, &file_lock, NULL);
b8dd7b9a 2939 if (err) {
849823c5 2940 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
1da177e4
LT		 2941 goto out_nfserr;
2942 }
2943 /*
2944 * OK, unlock succeeded; the only thing left to do is update the stateid.
2945 */
2946 update_stateid(&stp->st_stateid);
2947 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2948
2949out:
f2327d9a 2950 if (locku->lu_stateowner) {
1da177e4 2951 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2952 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2953 }
1da177e4
LT		 2954 nfs4_unlock_state();
2955 return status;
2956
2957out_nfserr:
b8dd7b9a 2958 status = nfserrno(err);
1da177e4
LT		 2959 goto out;
2960}
2961
2962/*
2963 * returns
2964 * 1: locks held by lockowner
2965 * 0: no locks held by lockowner
2966 */
2967static int
2968check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2969{
2970 struct file_lock **flpp;
7eaa36e2 2971 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2972 int status = 0;
2973
2974 lock_kernel();
2975 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2976 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2977 status = 1;
2978 goto out;
796dadfd 2979 }
1da177e4
LT		 2980 }
2981out:
2982 unlock_kernel();
2983 return status;
2984}
2985
b37ad28b 2986__be32
b591480b
BF		 2987nfsd4_release_lockowner(struct svc_rqst *rqstp,
2988 struct nfsd4_compound_state *cstate,
2989 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2990{
2991 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2992 struct nfs4_stateowner *sop;
2993 struct nfs4_stateid *stp;
1da177e4 2994 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2995 struct list_head matches;
2996 int i;
b37ad28b 2997 __be32 status;
1da177e4
LT		 2998
2999 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3000 clid->cl_boot, clid->cl_id);
3001
3002 /* XXX check for lease expiration */
3003
3004 status = nfserr_stale_clientid;
849823c5 3005 if (STALE_CLIENTID(clid))
1da177e4 3006 return status;
1da177e4
LT		 3007
3008 nfs4_lock_state();
3009
3e9e3dbe
N		 3010 status = nfserr_locks_held;
3011 /* XXX: we're doing a linear search through all the lockowners.
3012 * Yipes! For now we'll just hope clients aren't really using
3013 * release_lockowner much, but eventually we have to fix these
3014 * data structures. */
3015 INIT_LIST_HEAD(&matches);
3016 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3017 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3018 if (!cmp_owner_str(sop, owner, clid))
3019 continue;
3020 list_for_each_entry(stp, &sop->so_stateids,
3021 st_perstateowner) {
3022 if (check_for_locks(stp->st_vfs_file, sop))
3023 goto out;
3024 /* Note: so_perclient unused for lockowners,
3025 * so it's OK to fool with here. */
3026 list_add(&sop->so_perclient, &matches);
3027 }
1da177e4 3028 }
3e9e3dbe
N		 3029 }
3030 /* Clients probably won't expect us to return with some (but not all)
3031 * of the lockowner state released; so don't release any until all
3032 * have been checked. */
3033 status = nfs_ok;
0fa822e4
N		 3034 while (!list_empty(&matches)) {
3035 sop = list_entry(matches.next, struct nfs4_stateowner,
3036 so_perclient);
3037 /* unhash_stateowner deletes so_perclient only
3038 * for openowners. */
3039 list_del(&sop->so_perclient);
3e9e3dbe 3040 release_stateowner(sop);
1da177e4
LT		 3041 }
3042out:
3043 nfs4_unlock_state();
3044 return status;
3045}
3046
3047static inline struct nfs4_client_reclaim *
a55370a3 3048alloc_reclaim(void)
1da177e4 3049{
a55370a3 3050 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3051}
3052
c7b9a459
N		 3053int
3054nfs4_has_reclaimed_state(const char *name)
3055{
3056 unsigned int strhashval = clientstr_hashval(name);
3057 struct nfs4_client *clp;
3058
3059 clp = find_confirmed_client_by_str(name, strhashval);
3060 return clp ? 1 : 0;
3061}
3062
1da177e4
LT		 3063/*
3064 * failure => all reset bets are off, nfserr_no_grace...
3065 */
190e4fbf
N		 3066int
3067nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3068{
3069 unsigned int strhashval;
3070 struct nfs4_client_reclaim *crp = NULL;
3071
a55370a3
N		 3072 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3073 crp = alloc_reclaim();
1da177e4
LT		 3074 if (!crp)
3075 return 0;
a55370a3 3076 strhashval = clientstr_hashval(name);
1da177e4
LT		 3077 INIT_LIST_HEAD(&crp->cr_strhash);
3078 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3079 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3080 reclaim_str_hashtbl_size++;
3081 return 1;
3082}
3083
3084static void
3085nfs4_release_reclaim(void)
3086{
3087 struct nfs4_client_reclaim *crp = NULL;
3088 int i;
3089
1da177e4
LT		 3090 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3091 while (!list_empty(&reclaim_str_hashtbl[i])) {
3092 crp = list_entry(reclaim_str_hashtbl[i].next,
3093 struct nfs4_client_reclaim, cr_strhash);
3094 list_del(&crp->cr_strhash);
1da177e4
LT		 3095 kfree(crp);
3096 reclaim_str_hashtbl_size--;
3097 }
3098 }
3099 BUG_ON(reclaim_str_hashtbl_size);
3100}
3101
3102/*
3103 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3104static struct nfs4_client_reclaim *
1da177e4
LT		 3105nfs4_find_reclaim_client(clientid_t *clid)
3106{
3107 unsigned int strhashval;
3108 struct nfs4_client *clp;
3109 struct nfs4_client_reclaim *crp = NULL;
3110
3111
3112 /* find clientid in conf_id_hashtbl */
3113 clp = find_confirmed_client(clid);
3114 if (clp == NULL)
3115 return NULL;
3116
a55370a3
N		 3117 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3118 clp->cl_name.len, clp->cl_name.data,
3119 clp->cl_recdir);
1da177e4
LT		 3120
3121 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3122 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3123 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3124 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3125 return crp;
3126 }
3127 }
3128 return NULL;
3129}
3130
3131/*
3132* Called from OPEN. Look for clientid in reclaim list.
3133*/
b37ad28b 3134__be32
1da177e4
LT		 3135nfs4_check_open_reclaim(clientid_t *clid)
3136{
dfc83565 3137 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3138}
3139
ac4d8ff2 3140/* initialization to perform at module load time: */
1da177e4 3141
ac4d8ff2
N		 3142void
3143nfs4_state_init(void)
1da177e4
LT		 3144{
3145 int i;
1da177e4 3146
1da177e4
LT		 3147 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3148 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3149 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3150 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3151 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3152 }
3153 for (i = 0; i < FILE_HASH_SIZE; i++) {
3154 INIT_LIST_HEAD(&file_hashtbl[i]);
3155 }
3156 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3157 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3158 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3159 }
3160 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3161 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3162 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3163 }
3164 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3165 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3166 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3167 }
1da177e4 3168 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3169 INIT_LIST_HEAD(&close_lru);
3170 INIT_LIST_HEAD(&client_lru);
3171 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3172 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3173 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3174 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3175}
3176
190e4fbf
N		 3177static void
3178nfsd4_load_reboot_recovery_data(void)
3179{
3180 int status;
3181
0964a3d3
N		 3182 nfs4_lock_state();
3183 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3184 status = nfsd4_recdir_load();
0964a3d3 3185 nfs4_unlock_state();
190e4fbf
N		 3186 if (status)
3187 printk("NFSD: Failure reading reboot recovery data\n");
3188}
3189
ac4d8ff2
N		 3190/* initialization to perform when the nfsd service is started: */
3191
3192static void
3193__nfs4_state_start(void)
3194{
3195 time_t grace_time;
3196
1da177e4 3197 boot_time = get_seconds();
d99a05ad
N		 3198 grace_time = max(user_lease_time, lease_time);
3199 lease_time = user_lease_time;
a76b4319 3200 in_grace = 1;
d99a05ad 3201 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3202 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3203 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3204}
3205
3206int
76a3550e 3207nfs4_state_start(void)
1da177e4
LT		 3208{
3209 int status;
3210
3211 if (nfs4_init)
3212 return 0;
3213 status = nfsd4_init_slabs();
3214 if (status)
3215 return status;
190e4fbf 3216 nfsd4_load_reboot_recovery_data();
76a3550e 3217 __nfs4_state_start();
1da177e4
LT		 3218 nfs4_init = 1;
3219 return 0;
3220}
3221
3222int
3223nfs4_in_grace(void)
3224{
a76b4319 3225 return in_grace;
1da177e4
LT		 3226}
3227
3228time_t
3229nfs4_lease_time(void)
3230{
3231 return lease_time;
3232}
3233
3234static void
3235__nfs4_state_shutdown(void)
3236{
3237 int i;
3238 struct nfs4_client *clp = NULL;
3239 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3240 struct list_head *pos, *next, reaplist;
3241
1da177e4
LT		 3242 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3243 while (!list_empty(&conf_id_hashtbl[i])) {
3244 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3245 expire_client(clp);
3246 }
3247 while (!list_empty(&unconf_str_hashtbl[i])) {
3248 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3249 expire_client(clp);
3250 }
3251 }
3252 INIT_LIST_HEAD(&reaplist);
3253 spin_lock(&recall_lock);
3254 list_for_each_safe(pos, next, &del_recall_lru) {
3255 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3256 list_move(&dp->dl_recall_lru, &reaplist);
3257 }
3258 spin_unlock(&recall_lock);
3259 list_for_each_safe(pos, next, &reaplist) {
3260 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3261 list_del_init(&dp->dl_recall_lru);
3262 unhash_delegation(dp);
3263 }
3264
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)