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