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[PATCH] knfsd: nfsd4: remove cb_parsed
[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>
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Globals */
55static time_t lease_time = 90; /* default lease time */
d99a05ad 56static time_t user_lease_time = 90;
fd39ca9a 57static time_t boot_time;
a76b4319 58static int in_grace = 1;
1da177e4
LT		 59static u32 current_clientid = 1;
60static u32 current_ownerid = 1;
61static u32 current_fileid = 1;
62static u32 current_delegid = 1;
63static u32 nfs4_init;
fd39ca9a
N		 64static stateid_t zerostateid; /* bits all 0 */
65static stateid_t onestateid; /* bits all 1 */
66
67#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
68#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 69
1da177e4 70/* forward declarations */
fd39ca9a 71static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 72static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
73static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
74
75/* Locking:
76 *
77 * client_sema:
78 * protects clientid_hashtbl[], clientstr_hashtbl[],
79 * unconfstr_hashtbl[], uncofid_hashtbl[].
80 */
81static DECLARE_MUTEX(client_sema);
82
fd39ca9a
N		 83static kmem_cache_t *stateowner_slab = NULL;
84static kmem_cache_t *file_slab = NULL;
85static kmem_cache_t *stateid_slab = NULL;
86static kmem_cache_t *deleg_slab = NULL;
e60d4398 87
1da177e4
LT		 88void
89nfs4_lock_state(void)
90{
91 down(&client_sema);
92}
93
94void
95nfs4_unlock_state(void)
96{
97 up(&client_sema);
98}
99
100static inline u32
101opaque_hashval(const void *ptr, int nbytes)
102{
103 unsigned char *cptr = (unsigned char *) ptr;
104
105 u32 x = 0;
106 while (nbytes--) {
107 x *= 37;
108 x += *cptr++;
109 }
110 return x;
111}
112
113/* forward declarations */
114static void release_stateowner(struct nfs4_stateowner *sop);
115static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 116
117/*
118 * Delegation state
119 */
120
121/* recall_lock protects the del_recall_lru */
fd39ca9a 122static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static void
126free_nfs4_file(struct kref *kref)
127{
128 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
129 list_del(&fp->fi_hash);
130 iput(fp->fi_inode);
131 kmem_cache_free(file_slab, fp);
132}
133
134static inline void
135put_nfs4_file(struct nfs4_file *fi)
136{
137 kref_put(&fi->fi_ref, free_nfs4_file);
138}
139
140static inline void
141get_nfs4_file(struct nfs4_file *fi)
142{
143 kref_get(&fi->fi_ref);
144}
145
1da177e4
LT		 146static struct nfs4_delegation *
147alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
148{
149 struct nfs4_delegation *dp;
150 struct nfs4_file *fp = stp->st_file;
151 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
152
153 dprintk("NFSD alloc_init_deleg\n");
5b2d21c1
N		 154 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
155 if (dp == NULL)
1da177e4 156 return dp;
ea1da636
N		 157 INIT_LIST_HEAD(&dp->dl_perfile);
158 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 159 INIT_LIST_HEAD(&dp->dl_recall_lru);
160 dp->dl_client = clp;
13cd2184 161 get_nfs4_file(fp);
1da177e4
LT		 162 dp->dl_file = fp;
163 dp->dl_flock = NULL;
164 get_file(stp->st_vfs_file);
165 dp->dl_vfs_file = stp->st_vfs_file;
166 dp->dl_type = type;
167 dp->dl_recall.cbr_dp = NULL;
168 dp->dl_recall.cbr_ident = cb->cb_ident;
169 dp->dl_recall.cbr_trunc = 0;
170 dp->dl_stateid.si_boot = boot_time;
171 dp->dl_stateid.si_stateownerid = current_delegid++;
172 dp->dl_stateid.si_fileid = 0;
173 dp->dl_stateid.si_generation = 0;
174 dp->dl_fhlen = current_fh->fh_handle.fh_size;
175 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
176 current_fh->fh_handle.fh_size);
177 dp->dl_time = 0;
178 atomic_set(&dp->dl_count, 1);
ea1da636
N		 179 list_add(&dp->dl_perfile, &fp->fi_delegations);
180 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 181 return dp;
182}
183
184void
185nfs4_put_delegation(struct nfs4_delegation *dp)
186{
187 if (atomic_dec_and_test(&dp->dl_count)) {
188 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 189 put_nfs4_file(dp->dl_file);
5b2d21c1 190 kmem_cache_free(deleg_slab, dp);
1da177e4
LT		 191 }
192}
193
194/* Remove the associated file_lock first, then remove the delegation.
195 * lease_modify() is called to remove the FS_LEASE file_lock from
196 * the i_flock list, eventually calling nfsd's lock_manager
197 * fl_release_callback.
198 */
199static void
200nfs4_close_delegation(struct nfs4_delegation *dp)
201{
202 struct file *filp = dp->dl_vfs_file;
203
204 dprintk("NFSD: close_delegation dp %p\n",dp);
205 dp->dl_vfs_file = NULL;
206 /* The following nfsd_close may not actually close the file,
207 * but we want to remove the lease in any case. */
c907132d
N		 208 if (dp->dl_flock)
209 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 210 nfsd_close(filp);
1da177e4
LT		 211}
212
213/* Called under the state lock. */
214static void
215unhash_delegation(struct nfs4_delegation *dp)
216{
ea1da636
N		 217 list_del_init(&dp->dl_perfile);
218 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 219 spin_lock(&recall_lock);
220 list_del_init(&dp->dl_recall_lru);
221 spin_unlock(&recall_lock);
222 nfs4_close_delegation(dp);
223 nfs4_put_delegation(dp);
224}
225
226/*
227 * SETCLIENTID state
228 */
229
230/* Hash tables for nfs4_clientid state */
231#define CLIENT_HASH_BITS 4
232#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
233#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
234
235#define clientid_hashval(id) \
236 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 237#define clientstr_hashval(name) \
238 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 239/*
240 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
241 * used in reboot/reset lease grace period processing
242 *
243 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
244 * setclientid_confirmed info.
245 *
246 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
247 * setclientid info.
248 *
249 * client_lru holds client queue ordered by nfs4_client.cl_time
250 * for lease renewal.
251 *
252 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
253 * for last close replay.
254 */
255static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
256static int reclaim_str_hashtbl_size = 0;
257static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
258static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
259static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
260static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
261static struct list_head client_lru;
262static struct list_head close_lru;
263
264static inline void
265renew_client(struct nfs4_client *clp)
266{
267 /*
268 * Move client to the end to the LRU list.
269 */
270 dprintk("renewing client (clientid %08x/%08x)\n",
271 clp->cl_clientid.cl_boot,
272 clp->cl_clientid.cl_id);
273 list_move_tail(&clp->cl_lru, &client_lru);
274 clp->cl_time = get_seconds();
275}
276
277/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
278static int
279STALE_CLIENTID(clientid_t *clid)
280{
281 if (clid->cl_boot == boot_time)
282 return 0;
283 dprintk("NFSD stale clientid (%08x/%08x)\n",
284 clid->cl_boot, clid->cl_id);
285 return 1;
286}
287
288/*
289 * XXX Should we use a slab cache ?
290 * This type of memory management is somewhat inefficient, but we use it
291 * anyway since SETCLIENTID is not a common operation.
292 */
293static inline struct nfs4_client *
294alloc_client(struct xdr_netobj name)
295{
296 struct nfs4_client *clp;
297
298 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
299 memset(clp, 0, sizeof(*clp));
300 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
301 memcpy(clp->cl_name.data, name.data, name.len);
302 clp->cl_name.len = name.len;
303 }
304 else {
305 kfree(clp);
306 clp = NULL;
307 }
308 }
309 return clp;
310}
311
312static inline void
313free_client(struct nfs4_client *clp)
314{
315 if (clp->cl_cred.cr_group_info)
316 put_group_info(clp->cl_cred.cr_group_info);
317 kfree(clp->cl_name.data);
318 kfree(clp);
319}
320
321void
322put_nfs4_client(struct nfs4_client *clp)
323{
324 if (atomic_dec_and_test(&clp->cl_count))
325 free_client(clp);
326}
327
328static void
329expire_client(struct nfs4_client *clp)
330{
331 struct nfs4_stateowner *sop;
332 struct nfs4_delegation *dp;
333 struct nfs4_callback *cb = &clp->cl_callback;
334 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
335 struct list_head reaplist;
336
337 dprintk("NFSD: expire_client cl_count %d\n",
338 atomic_read(&clp->cl_count));
339
340 /* shutdown rpc client, ending any outstanding recall rpcs */
341 if (atomic_read(&cb->cb_set) == 1 && clnt) {
342 rpc_shutdown_client(clnt);
343 clnt = clp->cl_callback.cb_client = NULL;
344 }
345
346 INIT_LIST_HEAD(&reaplist);
347 spin_lock(&recall_lock);
ea1da636
N		 348 while (!list_empty(&clp->cl_delegations)) {
349 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 350 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
351 dp->dl_flock);
ea1da636 352 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 353 list_move(&dp->dl_recall_lru, &reaplist);
354 }
355 spin_unlock(&recall_lock);
356 while (!list_empty(&reaplist)) {
357 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
358 list_del_init(&dp->dl_recall_lru);
359 unhash_delegation(dp);
360 }
361 list_del(&clp->cl_idhash);
362 list_del(&clp->cl_strhash);
363 list_del(&clp->cl_lru);
ea1da636
N		 364 while (!list_empty(&clp->cl_openowners)) {
365 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 366 release_stateowner(sop);
367 }
368 put_nfs4_client(clp);
369}
370
371static struct nfs4_client *
a55370a3 372create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 373 struct nfs4_client *clp;
374
375 if (!(clp = alloc_client(name)))
376 goto out;
a55370a3 377 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 378 atomic_set(&clp->cl_count, 1);
379 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 380 INIT_LIST_HEAD(&clp->cl_idhash);
381 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 382 INIT_LIST_HEAD(&clp->cl_openowners);
383 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 384 INIT_LIST_HEAD(&clp->cl_lru);
385out:
386 return clp;
387}
388
389static void
390copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
391 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
392}
393
394static void
395copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
396 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
397 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
398}
399
400static void
401copy_cred(struct svc_cred *target, struct svc_cred *source) {
402
403 target->cr_uid = source->cr_uid;
404 target->cr_gid = source->cr_gid;
405 target->cr_group_info = source->cr_group_info;
406 get_group_info(target->cr_group_info);
407}
408
a55370a3
N		 409static inline int
410same_name(const char *n1, const char *n2) {
411 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 412}
413
414static int
415cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
416 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
417}
418
419static int
420cmp_clid(clientid_t * cl1, clientid_t * cl2) {
421 return((cl1->cl_boot == cl2->cl_boot) &&
422 (cl1->cl_id == cl2->cl_id));
423}
424
425/* XXX what about NGROUP */
426static int
427cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
428 return(cr1->cr_uid == cr2->cr_uid);
429
430}
431
432static void
433gen_clid(struct nfs4_client *clp) {
434 clp->cl_clientid.cl_boot = boot_time;
435 clp->cl_clientid.cl_id = current_clientid++;
436}
437
438static void
439gen_confirm(struct nfs4_client *clp) {
440 struct timespec tv;
441 u32 * p;
442
443 tv = CURRENT_TIME;
444 p = (u32 *)clp->cl_confirm.data;
445 *p++ = tv.tv_sec;
446 *p++ = tv.tv_nsec;
447}
448
449static int
450check_name(struct xdr_netobj name) {
451
452 if (name.len == 0)
453 return 0;
454 if (name.len > NFS4_OPAQUE_LIMIT) {
455 printk("NFSD: check_name: name too long(%d)!\n", name.len);
456 return 0;
457 }
458 return 1;
459}
460
fd39ca9a 461static void
1da177e4
LT		 462add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
463{
464 unsigned int idhashval;
465
466 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
467 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
468 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
469 list_add_tail(&clp->cl_lru, &client_lru);
470 clp->cl_time = get_seconds();
471}
472
fd39ca9a 473static void
1da177e4
LT		 474move_to_confirmed(struct nfs4_client *clp)
475{
476 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
477 unsigned int strhashval;
478
479 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
480 list_del_init(&clp->cl_strhash);
481 list_del_init(&clp->cl_idhash);
482 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 483 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 484 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
485 renew_client(clp);
486}
487
488static struct nfs4_client *
489find_confirmed_client(clientid_t *clid)
490{
491 struct nfs4_client *clp;
492 unsigned int idhashval = clientid_hashval(clid->cl_id);
493
494 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
495 if (cmp_clid(&clp->cl_clientid, clid))
496 return clp;
497 }
498 return NULL;
499}
500
501static struct nfs4_client *
502find_unconfirmed_client(clientid_t *clid)
503{
504 struct nfs4_client *clp;
505 unsigned int idhashval = clientid_hashval(clid->cl_id);
506
507 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
508 if (cmp_clid(&clp->cl_clientid, clid))
509 return clp;
510 }
511 return NULL;
512}
513
28ce6054
N		 514static struct nfs4_client *
515find_confirmed_client_by_str(const char *dname, unsigned int hashval)
516{
517 struct nfs4_client *clp;
518
519 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
520 if (same_name(clp->cl_recdir, dname))
521 return clp;
522 }
523 return NULL;
524}
525
526static struct nfs4_client *
527find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
528{
529 struct nfs4_client *clp;
530
531 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
532 if (same_name(clp->cl_recdir, dname))
533 return clp;
534 }
535 return NULL;
536}
537
1da177e4
LT		 538/* a helper function for parse_callback */
539static int
540parse_octet(unsigned int *lenp, char **addrp)
541{
542 unsigned int len = *lenp;
543 char *p = *addrp;
544 int n = -1;
545 char c;
546
547 for (;;) {
548 if (!len)
549 break;
550 len--;
551 c = *p++;
552 if (c == '.')
553 break;
554 if ((c < '0') || (c > '9')) {
555 n = -1;
556 break;
557 }
558 if (n < 0)
559 n = 0;
560 n = (n * 10) + (c - '0');
561 if (n > 255) {
562 n = -1;
563 break;
564 }
565 }
566 *lenp = len;
567 *addrp = p;
568 return n;
569}
570
571/* parse and set the setclientid ipv4 callback address */
fd39ca9a 572static int
1da177e4
LT		 573parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
574{
575 int temp = 0;
576 u32 cbaddr = 0;
577 u16 cbport = 0;
578 u32 addrlen = addr_len;
579 char *addr = addr_val;
580 int i, shift;
581
582 /* ipaddress */
583 shift = 24;
584 for(i = 4; i > 0 ; i--) {
585 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
586 return 0;
587 }
588 cbaddr |= (temp << shift);
589 if (shift > 0)
590 shift -= 8;
591 }
592 *cbaddrp = cbaddr;
593
594 /* port */
595 shift = 8;
596 for(i = 2; i > 0 ; i--) {
597 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
598 return 0;
599 }
600 cbport |= (temp << shift);
601 if (shift > 0)
602 shift -= 8;
603 }
604 *cbportp = cbport;
605 return 1;
606}
607
fd39ca9a 608static void
1da177e4
LT		 609gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
610{
611 struct nfs4_callback *cb = &clp->cl_callback;
612
613 /* Currently, we only support tcp for the callback channel */
614 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
615 goto out_err;
616
617 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
618 &cb->cb_addr, &cb->cb_port)))
619 goto out_err;
620 cb->cb_prog = se->se_callback_prog;
621 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 622 return;
623out_err:
624 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
625 "will not receive delegations\n",
626 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
627
1da177e4
LT		 628 return;
629}
630
631/*
632 * RFC 3010 has a complex implmentation description of processing a
633 * SETCLIENTID request consisting of 5 bullets, labeled as
634 * CASE0 - CASE4 below.
635 *
636 * NOTES:
637 * callback information will be processed in a future patch
638 *
639 * an unconfirmed record is added when:
640 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
641 * CASE 1: confirmed record found with matching name, principal,
642 * verifier, and clientid.
643 * CASE 2: confirmed record found with matching name, principal,
644 * and there is no unconfirmed record with matching
645 * name and principal
646 *
647 * an unconfirmed record is replaced when:
648 * CASE 3: confirmed record found with matching name, principal,
649 * and an unconfirmed record is found with matching
650 * name, principal, and with clientid and
651 * confirm that does not match the confirmed record.
652 * CASE 4: there is no confirmed record with matching name and
653 * principal. there is an unconfirmed record with
654 * matching name, principal.
655 *
656 * an unconfirmed record is deleted when:
657 * CASE 1: an unconfirmed record that matches input name, verifier,
658 * and confirmed clientid.
659 * CASE 4: any unconfirmed records with matching name and principal
660 * that exist after an unconfirmed record has been replaced
661 * as described above.
662 *
663 */
664int
665nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
666{
667 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
668 struct xdr_netobj clname = {
669 .len = setclid->se_namelen,
670 .data = setclid->se_name,
671 };
672 nfs4_verifier clverifier = setclid->se_verf;
673 unsigned int strhashval;
28ce6054 674 struct nfs4_client *conf, *unconf, *new;
1da177e4 675 int status;
a55370a3 676 char dname[HEXDIR_LEN];
1da177e4
LT		 677
678 status = nfserr_inval;
679 if (!check_name(clname))
680 goto out;
681
a55370a3
N		 682 status = nfs4_make_rec_clidname(dname, &clname);
683 if (status)
684 goto out;
685
1da177e4
LT		 686 /*
687 * XXX The Duplicate Request Cache (DRC) has been checked (??)
688 * We get here on a DRC miss.
689 */
690
a55370a3 691 strhashval = clientstr_hashval(dname);
1da177e4 692
1da177e4 693 nfs4_lock_state();
28ce6054
N		 694 conf = find_confirmed_client_by_str(dname, strhashval);
695 if (conf) {
1da177e4
LT		 696 /*
697 * CASE 0:
698 * clname match, confirmed, different principal
699 * or different ip_address
700 */
701 status = nfserr_clid_inuse;
28ce6054
N		 702 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
703 || conf->cl_addr != ip_addr) {
1da177e4
LT		 704 printk("NFSD: setclientid: string in use by client"
705 "(clientid %08x/%08x)\n",
28ce6054 706 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 707 goto out;
708 }
1da177e4 709 }
28ce6054 710 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 711 status = nfserr_resource;
712 if (!conf) {
713 /*
714 * CASE 4:
715 * placed first, because it is the normal case.
716 */
717 if (unconf)
718 expire_client(unconf);
a55370a3
N		 719 new = create_client(clname, dname);
720 if (new == NULL)
1da177e4
LT		 721 goto out;
722 copy_verf(new, &clverifier);
723 new->cl_addr = ip_addr;
724 copy_cred(&new->cl_cred,&rqstp->rq_cred);
725 gen_clid(new);
726 gen_confirm(new);
727 gen_callback(new, setclid);
728 add_to_unconfirmed(new, strhashval);
729 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
730 /*
731 * CASE 1:
732 * cl_name match, confirmed, principal match
733 * verifier match: probable callback update
734 *
735 * remove any unconfirmed nfs4_client with
736 * matching cl_name, cl_verifier, and cl_clientid
737 *
738 * create and insert an unconfirmed nfs4_client with same
739 * cl_name, cl_verifier, and cl_clientid as existing
740 * nfs4_client, but with the new callback info and a
741 * new cl_confirm
742 */
31f4a6c1
N		 743 if (unconf) {
744 /* Note this is removing unconfirmed {*x***},
745 * which is stronger than RFC recommended {vxc**}.
746 * This has the advantage that there is at most
747 * one {*x***} in either list at any time.
748 */
749 expire_client(unconf);
1da177e4 750 }
a55370a3
N		 751 new = create_client(clname, dname);
752 if (new == NULL)
1da177e4
LT		 753 goto out;
754 copy_verf(new,&conf->cl_verifier);
755 new->cl_addr = ip_addr;
756 copy_cred(&new->cl_cred,&rqstp->rq_cred);
757 copy_clid(new, conf);
758 gen_confirm(new);
759 gen_callback(new, setclid);
760 add_to_unconfirmed(new,strhashval);
761 } else if (!unconf) {
762 /*
763 * CASE 2:
764 * clname match, confirmed, principal match
765 * verfier does not match
766 * no unconfirmed. create a new unconfirmed nfs4_client
767 * using input clverifier, clname, and callback info
768 * and generate a new cl_clientid and cl_confirm.
769 */
a55370a3
N		 770 new = create_client(clname, dname);
771 if (new == NULL)
1da177e4
LT		 772 goto out;
773 copy_verf(new,&clverifier);
774 new->cl_addr = ip_addr;
775 copy_cred(&new->cl_cred,&rqstp->rq_cred);
776 gen_clid(new);
777 gen_confirm(new);
778 gen_callback(new, setclid);
779 add_to_unconfirmed(new, strhashval);
780 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
781 /*
782 * CASE3:
783 * confirmed found (name, principal match)
784 * confirmed verifier does not match input clverifier
785 *
786 * unconfirmed found (name match)
787 * confirmed->cl_confirm != unconfirmed->cl_confirm
788 *
789 * remove unconfirmed.
790 *
791 * create an unconfirmed nfs4_client
792 * with same cl_name as existing confirmed nfs4_client,
793 * but with new callback info, new cl_clientid,
794 * new cl_verifier and a new cl_confirm
795 */
796 expire_client(unconf);
a55370a3
N		 797 new = create_client(clname, dname);
798 if (new == NULL)
1da177e4
LT		 799 goto out;
800 copy_verf(new,&clverifier);
801 new->cl_addr = ip_addr;
802 copy_cred(&new->cl_cred,&rqstp->rq_cred);
803 gen_clid(new);
804 gen_confirm(new);
805 gen_callback(new, setclid);
806 add_to_unconfirmed(new, strhashval);
807 } else {
808 /* No cases hit !!! */
809 status = nfserr_inval;
810 goto out;
811
812 }
813 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
814 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
815 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
816 status = nfs_ok;
817out:
818 nfs4_unlock_state();
819 return status;
820}
821
822
823/*
824 * RFC 3010 has a complex implmentation description of processing a
825 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
826 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
827 *
828 * NOTE: callback information will be processed here in a future patch
829 */
830int
831nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
832{
833 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
21ab45a4 834 struct nfs4_client *conf, *unconf;
1da177e4
LT		 835 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
836 clientid_t * clid = &setclientid_confirm->sc_clientid;
837 int status;
838
839 if (STALE_CLIENTID(clid))
840 return nfserr_stale_clientid;
841 /*
842 * XXX The Duplicate Request Cache (DRC) has been checked (??)
843 * We get here on a DRC miss.
844 */
845
846 nfs4_lock_state();
21ab45a4
N		 847
848 conf = find_confirmed_client(clid);
849 unconf = find_unconfirmed_client(clid);
850
851 status = nfserr_clid_inuse;
852 if (conf && conf->cl_addr != ip_addr)
853 goto out;
854 if (unconf && unconf->cl_addr != ip_addr)
855 goto out;
856
1da177e4
LT		 857 if ((conf && unconf) &&
858 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
859 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 860 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 861 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 862 /* CASE 1:
863 * unconf record that matches input clientid and input confirm.
864 * conf record that matches input clientid.
865 * conf and unconf records match names, verifiers
866 */
1da177e4
LT		 867 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
868 status = nfserr_clid_inuse;
869 else {
1a69c179
N		 870 /* XXX: We just turn off callbacks until we can handle
871 * change request correctly. */
cb36d634 872 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 873 gen_confirm(conf);
1a69c179 874 expire_client(unconf);
1da177e4 875 status = nfs_ok;
1a69c179 876
1da177e4 877 }
7c79f737 878 } else if ((conf && !unconf) ||
1da177e4
LT		 879 ((conf && unconf) &&
880 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 881 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 882 /* CASE 2:
883 * conf record that matches input clientid.
884 * if unconf record matches input clientid, then
885 * unconf->cl_name or unconf->cl_verifier don't match the
886 * conf record.
887 */
21ab45a4 888 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 889 status = nfserr_clid_inuse;
21ab45a4 890 else
1da177e4 891 status = nfs_ok;
7c79f737
N		 892 } else if (!conf && unconf
893 && cmp_verf(&unconf->cl_confirm, &confirm)) {
894 /* CASE 3:
895 * conf record not found.
896 * unconf record found.
897 * unconf->cl_confirm matches input confirm
898 */
1da177e4
LT		 899 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
900 status = nfserr_clid_inuse;
901 } else {
1a69c179
N		 902 unsigned int hash =
903 clientstr_hashval(unconf->cl_recdir);
904 conf = find_confirmed_client_by_str(unconf->cl_recdir,
905 hash);
906 if (conf) {
907 expire_client(conf);
908 }
1da177e4 909 move_to_confirmed(unconf);
21ab45a4 910 conf = unconf;
1a69c179 911 status = nfs_ok;
1da177e4 912 }
7c79f737
N		 913 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
914 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
915 &confirm)))) {
916 /* CASE 4:
917 * conf record not found, or if conf, conf->cl_confirm does not
918 * match input confirm.
919 * unconf record not found, or if unconf, unconf->cl_confirm
920 * does not match input confirm.
921 */
1da177e4 922 status = nfserr_stale_clientid;
7c79f737 923 } else {
08e8987c
N		 924 /* check that we have hit one of the cases...*/
925 status = nfserr_clid_inuse;
926 }
1da177e4
LT		 927out:
928 if (!status)
21ab45a4 929 nfsd4_probe_callback(conf);
1da177e4
LT		 930 nfs4_unlock_state();
931 return status;
932}
933
934/*
935 * Open owner state (share locks)
936 */
937
938/* hash tables for nfs4_stateowner */
939#define OWNER_HASH_BITS 8
940#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
941#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
942
943#define ownerid_hashval(id) \
944 ((id) & OWNER_HASH_MASK)
945#define ownerstr_hashval(clientid, ownername) \
946 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
947
948static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
949static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
950
951/* hash table for nfs4_file */
952#define FILE_HASH_BITS 8
953#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
954#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
955/* hash table for (open)nfs4_stateid */
956#define STATEID_HASH_BITS 10
957#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
958#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
959
960#define file_hashval(x) \
961 hash_ptr(x, FILE_HASH_BITS)
962#define stateid_hashval(owner_id, file_id) \
963 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
964
965static struct list_head file_hashtbl[FILE_HASH_SIZE];
966static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
967
968/* OPEN Share state helper functions */
969static inline struct nfs4_file *
970alloc_init_file(struct inode *ino)
971{
972 struct nfs4_file *fp;
973 unsigned int hashval = file_hashval(ino);
974
e60d4398
N		 975 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
976 if (fp) {
13cd2184 977 kref_init(&fp->fi_ref);
1da177e4 978 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 979 INIT_LIST_HEAD(&fp->fi_stateids);
980 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 981 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
982 fp->fi_inode = igrab(ino);
983 fp->fi_id = current_fileid++;
1da177e4
LT		 984 return fp;
985 }
986 return NULL;
987}
988
e60d4398
N		 989static void
990nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 991{
e60d4398
N		 992 int status;
993
994 if (*slab == NULL)
995 return;
996 status = kmem_cache_destroy(*slab);
997 *slab = NULL;
998 WARN_ON(status);
1da177e4
LT		 999}
1000
1001static void
1002nfsd4_free_slabs(void)
1003{
e60d4398
N		 1004 nfsd4_free_slab(&stateowner_slab);
1005 nfsd4_free_slab(&file_slab);
5ac049ac 1006 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1007 nfsd4_free_slab(&deleg_slab);
e60d4398 1008}
1da177e4 1009
e60d4398
N		 1010static int
1011nfsd4_init_slabs(void)
1012{
1013 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1014 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1015 if (stateowner_slab == NULL)
1016 goto out_nomem;
1017 file_slab = kmem_cache_create("nfsd4_files",
1018 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1019 if (file_slab == NULL)
1020 goto out_nomem;
5ac049ac
N		 1021 stateid_slab = kmem_cache_create("nfsd4_stateids",
1022 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1023 if (stateid_slab == NULL)
1024 goto out_nomem;
5b2d21c1
N		 1025 deleg_slab = kmem_cache_create("nfsd4_delegations",
1026 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1027 if (deleg_slab == NULL)
1028 goto out_nomem;
e60d4398
N		 1029 return 0;
1030out_nomem:
1031 nfsd4_free_slabs();
1032 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1033 return -ENOMEM;
1da177e4
LT		 1034}
1035
1036void
1037nfs4_free_stateowner(struct kref *kref)
1038{
1039 struct nfs4_stateowner *sop =
1040 container_of(kref, struct nfs4_stateowner, so_ref);
1041 kfree(sop->so_owner.data);
1042 kmem_cache_free(stateowner_slab, sop);
1043}
1044
1045static inline struct nfs4_stateowner *
1046alloc_stateowner(struct xdr_netobj *owner)
1047{
1048 struct nfs4_stateowner *sop;
1049
1050 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1051 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1052 memcpy(sop->so_owner.data, owner->data, owner->len);
1053 sop->so_owner.len = owner->len;
1054 kref_init(&sop->so_ref);
1055 return sop;
1056 }
1057 kmem_cache_free(stateowner_slab, sop);
1058 }
1059 return NULL;
1060}
1061
1062static struct nfs4_stateowner *
1063alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1064 struct nfs4_stateowner *sop;
1065 struct nfs4_replay *rp;
1066 unsigned int idhashval;
1067
1068 if (!(sop = alloc_stateowner(&open->op_owner)))
1069 return NULL;
1070 idhashval = ownerid_hashval(current_ownerid);
1071 INIT_LIST_HEAD(&sop->so_idhash);
1072 INIT_LIST_HEAD(&sop->so_strhash);
1073 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1074 INIT_LIST_HEAD(&sop->so_stateids);
1075 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1076 INIT_LIST_HEAD(&sop->so_close_lru);
1077 sop->so_time = 0;
1078 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1079 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1080 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1081 sop->so_is_open_owner = 1;
1082 sop->so_id = current_ownerid++;
1083 sop->so_client = clp;
1084 sop->so_seqid = open->op_seqid;
1085 sop->so_confirmed = 0;
1086 rp = &sop->so_replay;
1087 rp->rp_status = NFSERR_SERVERFAULT;
1088 rp->rp_buflen = 0;
1089 rp->rp_buf = rp->rp_ibuf;
1090 return sop;
1091}
1092
1093static void
1094release_stateid_lockowners(struct nfs4_stateid *open_stp)
1095{
1096 struct nfs4_stateowner *lock_sop;
1097
ea1da636
N		 1098 while (!list_empty(&open_stp->st_lockowners)) {
1099 lock_sop = list_entry(open_stp->st_lockowners.next,
1100 struct nfs4_stateowner, so_perstateid);
1101 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1102 BUG_ON(lock_sop->so_is_open_owner);
1103 release_stateowner(lock_sop);
1104 }
1105}
1106
1107static void
1108unhash_stateowner(struct nfs4_stateowner *sop)
1109{
1110 struct nfs4_stateid *stp;
1111
1112 list_del(&sop->so_idhash);
1113 list_del(&sop->so_strhash);
6fa305de 1114 if (sop->so_is_open_owner)
1da177e4 1115 list_del(&sop->so_perclient);
ea1da636
N		 1116 list_del(&sop->so_perstateid);
1117 while (!list_empty(&sop->so_stateids)) {
1118 stp = list_entry(sop->so_stateids.next,
1119 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1120 if (sop->so_is_open_owner)
1121 release_stateid(stp, OPEN_STATE);
1122 else
1123 release_stateid(stp, LOCK_STATE);
1124 }
1125}
1126
1127static void
1128release_stateowner(struct nfs4_stateowner *sop)
1129{
1130 unhash_stateowner(sop);
1131 list_del(&sop->so_close_lru);
1132 nfs4_put_stateowner(sop);
1133}
1134
1135static inline void
1136init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1137 struct nfs4_stateowner *sop = open->op_stateowner;
1138 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1139
1140 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1141 INIT_LIST_HEAD(&stp->st_perstateowner);
1142 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1143 INIT_LIST_HEAD(&stp->st_perfile);
1144 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1145 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1146 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1147 stp->st_stateowner = sop;
13cd2184 1148 get_nfs4_file(fp);
1da177e4
LT		 1149 stp->st_file = fp;
1150 stp->st_stateid.si_boot = boot_time;
1151 stp->st_stateid.si_stateownerid = sop->so_id;
1152 stp->st_stateid.si_fileid = fp->fi_id;
1153 stp->st_stateid.si_generation = 0;
1154 stp->st_access_bmap = 0;
1155 stp->st_deny_bmap = 0;
1156 __set_bit(open->op_share_access, &stp->st_access_bmap);
1157 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1158}
1159
1160static void
1161release_stateid(struct nfs4_stateid *stp, int flags)
1162{
1163 struct file *filp = stp->st_vfs_file;
1164
1165 list_del(&stp->st_hash);
1da177e4 1166 list_del(&stp->st_perfile);
ea1da636 1167 list_del(&stp->st_perstateowner);
1da177e4
LT		 1168 if (flags & OPEN_STATE) {
1169 release_stateid_lockowners(stp);
1170 stp->st_vfs_file = NULL;
1171 nfsd_close(filp);
1da177e4
LT		 1172 } else if (flags & LOCK_STATE)
1173 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1174 put_nfs4_file(stp->st_file);
5ac049ac 1175 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1176 stp = NULL;
1177}
1178
fd39ca9a 1179static void
1da177e4
LT		 1180move_to_close_lru(struct nfs4_stateowner *sop)
1181{
1182 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1183
1184 unhash_stateowner(sop);
1185 list_add_tail(&sop->so_close_lru, &close_lru);
1186 sop->so_time = get_seconds();
1187}
1188
fd39ca9a 1189static void
1da177e4
LT		 1190release_state_owner(struct nfs4_stateid *stp, int flag)
1191{
1192 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1193
1194 dprintk("NFSD: release_state_owner\n");
1195 release_stateid(stp, flag);
1196
1197 /* place unused nfs4_stateowners on so_close_lru list to be
1198 * released by the laundromat service after the lease period
1199 * to enable us to handle CLOSE replay
1200 */
ea1da636 1201 if (sop->so_confirmed && list_empty(&sop->so_stateids))
1da177e4 1202 move_to_close_lru(sop);
1da177e4
LT		 1203}
1204
1205static int
1206cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1207 return ((sop->so_owner.len == owner->len) &&
1208 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1209 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1210}
1211
1212static struct nfs4_stateowner *
1213find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1214{
1215 struct nfs4_stateowner *so = NULL;
1216
1217 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1218 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1219 return so;
1220 }
1221 return NULL;
1222}
1223
1224/* search file_hashtbl[] for file */
1225static struct nfs4_file *
1226find_file(struct inode *ino)
1227{
1228 unsigned int hashval = file_hashval(ino);
1229 struct nfs4_file *fp;
1230
1231 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1232 if (fp->fi_inode == ino) {
1233 get_nfs4_file(fp);
1da177e4 1234 return fp;
13cd2184 1235 }
1da177e4
LT		 1236 }
1237 return NULL;
1238}
1239
1240#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1241#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1242
fd39ca9a 1243static void
1da177e4
LT		 1244set_access(unsigned int *access, unsigned long bmap) {
1245 int i;
1246
1247 *access = 0;
1248 for (i = 1; i < 4; i++) {
1249 if (test_bit(i, &bmap))
1250 *access |= i;
1251 }
1252}
1253
fd39ca9a 1254static void
1da177e4
LT		 1255set_deny(unsigned int *deny, unsigned long bmap) {
1256 int i;
1257
1258 *deny = 0;
1259 for (i = 0; i < 4; i++) {
1260 if (test_bit(i, &bmap))
1261 *deny |= i ;
1262 }
1263}
1264
1265static int
1266test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1267 unsigned int access, deny;
1268
1269 set_access(&access, stp->st_access_bmap);
1270 set_deny(&deny, stp->st_deny_bmap);
1271 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1272 return 0;
1273 return 1;
1274}
1275
1276/*
1277 * Called to check deny when READ with all zero stateid or
1278 * WRITE with all zero or all one stateid
1279 */
fd39ca9a 1280static int
1da177e4
LT		 1281nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1282{
1283 struct inode *ino = current_fh->fh_dentry->d_inode;
1284 struct nfs4_file *fp;
1285 struct nfs4_stateid *stp;
13cd2184 1286 int ret;
1da177e4
LT		 1287
1288 dprintk("NFSD: nfs4_share_conflict\n");
1289
1290 fp = find_file(ino);
13cd2184
N		 1291 if (!fp)
1292 return nfs_ok;
1293 ret = nfserr_share_denied;
1da177e4 1294 /* Search for conflicting share reservations */
13cd2184
N		 1295 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1296 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1297 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1298 goto out;
1da177e4 1299 }
13cd2184
N		 1300 ret = nfs_ok;
1301out:
1302 put_nfs4_file(fp);
1303 return ret;
1da177e4
LT		 1304}
1305
1306static inline void
1307nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1308{
1309 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1310 put_write_access(filp->f_dentry->d_inode);
1311 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1312 }
1313}
1314
1315/*
1316 * Recall a delegation
1317 */
1318static int
1319do_recall(void *__dp)
1320{
1321 struct nfs4_delegation *dp = __dp;
1322
1323 daemonize("nfsv4-recall");
1324
1325 nfsd4_cb_recall(dp);
1326 return 0;
1327}
1328
1329/*
1330 * Spawn a thread to perform a recall on the delegation represented
1331 * by the lease (file_lock)
1332 *
1333 * Called from break_lease() with lock_kernel() held.
1334 * Note: we assume break_lease will only call this *once* for any given
1335 * lease.
1336 */
1337static
1338void nfsd_break_deleg_cb(struct file_lock *fl)
1339{
1340 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1341 struct task_struct *t;
1342
1343 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1344 if (!dp)
1345 return;
1346
1347 /* We're assuming the state code never drops its reference
1348 * without first removing the lease. Since we're in this lease
1349 * callback (and since the lease code is serialized by the kernel
1350 * lock) we know the server hasn't removed the lease yet, we know
1351 * it's safe to take a reference: */
1352 atomic_inc(&dp->dl_count);
1353
1354 spin_lock(&recall_lock);
1355 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1356 spin_unlock(&recall_lock);
1357
1358 /* only place dl_time is set. protected by lock_kernel*/
1359 dp->dl_time = get_seconds();
1360
1361 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1362 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1363
1364 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1365 if (IS_ERR(t)) {
1366 struct nfs4_client *clp = dp->dl_client;
1367
1368 printk(KERN_INFO "NFSD: Callback thread failed for "
1369 "for client (clientid %08x/%08x)\n",
1370 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1371 nfs4_put_delegation(dp);
1372 }
1373}
1374
1375/*
1376 * The file_lock is being reapd.
1377 *
1378 * Called by locks_free_lock() with lock_kernel() held.
1379 */
1380static
1381void nfsd_release_deleg_cb(struct file_lock *fl)
1382{
1383 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1384
1385 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1386
1387 if (!(fl->fl_flags & FL_LEASE) || !dp)
1388 return;
1389 dp->dl_flock = NULL;
1390}
1391
1392/*
1393 * Set the delegation file_lock back pointer.
1394 *
1395 * Called from __setlease() with lock_kernel() held.
1396 */
1397static
1398void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1399{
1400 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1401
1402 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1403 if (!dp)
1404 return;
1405 dp->dl_flock = new;
1406}
1407
1408/*
1409 * Called from __setlease() with lock_kernel() held
1410 */
1411static
1412int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1413{
1414 struct nfs4_delegation *onlistd =
1415 (struct nfs4_delegation *)onlist->fl_owner;
1416 struct nfs4_delegation *tryd =
1417 (struct nfs4_delegation *)try->fl_owner;
1418
1419 if (onlist->fl_lmops != try->fl_lmops)
1420 return 0;
1421
1422 return onlistd->dl_client == tryd->dl_client;
1423}
1424
1425
1426static
1427int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1428{
1429 if (arg & F_UNLCK)
1430 return lease_modify(onlist, arg);
1431 else
1432 return -EAGAIN;
1433}
1434
fd39ca9a 1435static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1436 .fl_break = nfsd_break_deleg_cb,
1437 .fl_release_private = nfsd_release_deleg_cb,
1438 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1439 .fl_mylease = nfsd_same_client_deleg_cb,
1440 .fl_change = nfsd_change_deleg_cb,
1441};
1442
1443
1444/*
1445 * nfsd4_process_open1()
1446 * lookup stateowner.
1447 * found:
1448 * check confirmed
1449 * confirmed:
1450 * check seqid
1451 * not confirmed:
1452 * delete owner
1453 * create new owner
1454 * notfound:
1455 * verify clientid
1456 * create new owner
1457 *
1458 * called with nfs4_lock_state() held.
1459 */
1460int
1461nfsd4_process_open1(struct nfsd4_open *open)
1462{
1463 int status;
1464 clientid_t *clientid = &open->op_clientid;
1465 struct nfs4_client *clp = NULL;
1466 unsigned int strhashval;
1467 struct nfs4_stateowner *sop = NULL;
1468
1469 status = nfserr_inval;
1470 if (!check_name(open->op_owner))
1471 goto out;
1472
1473 if (STALE_CLIENTID(&open->op_clientid))
1474 return nfserr_stale_clientid;
1475
1476 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1477 sop = find_openstateowner_str(strhashval, open);
1478 if (sop) {
1479 open->op_stateowner = sop;
1480 /* check for replay */
1481 if (open->op_seqid == sop->so_seqid){
1482 if (sop->so_replay.rp_buflen)
1483 return NFSERR_REPLAY_ME;
1484 else {
1485 /* The original OPEN failed so spectacularly
1486 * that we don't even have replay data saved!
1487 * Therefore, we have no choice but to continue
1488 * processing this OPEN; presumably, we'll
1489 * fail again for the same reason.
1490 */
1491 dprintk("nfsd4_process_open1:"
1492 " replay with no replay cache\n");
1493 goto renew;
1494 }
1495 } else if (sop->so_confirmed) {
1496 if (open->op_seqid == sop->so_seqid + 1)
1497 goto renew;
1498 status = nfserr_bad_seqid;
1499 goto out;
1500 } else {
1501 /* If we get here, we received an OPEN for an
1502 * unconfirmed nfs4_stateowner. Since the seqid's are
1503 * different, purge the existing nfs4_stateowner, and
1504 * instantiate a new one.
1505 */
1506 clp = sop->so_client;
1507 release_stateowner(sop);
1508 }
1509 } else {
1510 /* nfs4_stateowner not found.
1511 * Verify clientid and instantiate new nfs4_stateowner.
1512 * If verify fails this is presumably the result of the
1513 * client's lease expiring.
1514 */
1515 status = nfserr_expired;
1516 clp = find_confirmed_client(clientid);
1517 if (clp == NULL)
1518 goto out;
1519 }
1520 status = nfserr_resource;
1521 sop = alloc_init_open_stateowner(strhashval, clp, open);
1522 if (sop == NULL)
1523 goto out;
1524 open->op_stateowner = sop;
1525renew:
1526 status = nfs_ok;
1527 renew_client(sop->so_client);
1528out:
1529 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1530 status = nfserr_reclaim_bad;
1531 return status;
1532}
1533
4a6e43e6
N		 1534static inline int
1535nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1536{
1537 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1538 return nfserr_openmode;
1539 else
1540 return nfs_ok;
1541}
1542
52f4fb43
N		 1543static struct nfs4_delegation *
1544find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1545{
1546 struct nfs4_delegation *dp;
1547
ea1da636 1548 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1549 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1550 return dp;
1551 }
1552 return NULL;
1553}
1554
c44c5eeb 1555static int
567d9829
N		 1556nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1557 struct nfs4_delegation **dp)
1558{
1559 int flags;
c44c5eeb 1560 int status = nfserr_bad_stateid;
567d9829
N		 1561
1562 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1563 if (*dp == NULL)
c44c5eeb 1564 goto out;
567d9829
N		 1565 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1566 RD_STATE : WR_STATE;
1567 status = nfs4_check_delegmode(*dp, flags);
1568 if (status)
1569 *dp = NULL;
c44c5eeb
N		 1570out:
1571 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1572 return nfs_ok;
1573 if (status)
1574 return status;
1575 open->op_stateowner->so_confirmed = 1;
1576 return nfs_ok;
567d9829
N		 1577}
1578
1da177e4
LT		 1579static int
1580nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1581{
1582 struct nfs4_stateid *local;
1583 int status = nfserr_share_denied;
1584 struct nfs4_stateowner *sop = open->op_stateowner;
1585
8beefa24 1586 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1587 /* ignore lock owners */
1588 if (local->st_stateowner->so_is_open_owner == 0)
1589 continue;
1590 /* remember if we have seen this open owner */
1591 if (local->st_stateowner == sop)
1592 *stpp = local;
1593 /* check for conflicting share reservations */
1594 if (!test_share(local, open))
1595 goto out;
1596 }
1597 status = 0;
1598out:
1599 return status;
1600}
1601
5ac049ac
N		 1602static inline struct nfs4_stateid *
1603nfs4_alloc_stateid(void)
1604{
1605 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1606}
1607
1da177e4
LT		 1608static int
1609nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1610 struct nfs4_delegation *dp,
1da177e4
LT		 1611 struct svc_fh *cur_fh, int flags)
1612{
1613 struct nfs4_stateid *stp;
1da177e4 1614
5ac049ac 1615 stp = nfs4_alloc_stateid();
1da177e4
LT		 1616 if (stp == NULL)
1617 return nfserr_resource;
1618
567d9829
N		 1619 if (dp) {
1620 get_file(dp->dl_vfs_file);
1621 stp->st_vfs_file = dp->dl_vfs_file;
1622 } else {
1623 int status;
1624 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1625 &stp->st_vfs_file);
1626 if (status) {
1627 if (status == nfserr_dropit)
1628 status = nfserr_jukebox;
5ac049ac 1629 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1630 return status;
1631 }
1da177e4 1632 }
1da177e4
LT		 1633 *stpp = stp;
1634 return 0;
1635}
1636
1637static inline int
1638nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1639 struct nfsd4_open *open)
1640{
1641 struct iattr iattr = {
1642 .ia_valid = ATTR_SIZE,
1643 .ia_size = 0,
1644 };
1645 if (!open->op_truncate)
1646 return 0;
1647 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1648 return -EINVAL;
1649 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1650}
1651
1652static int
1653nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1654{
1655 struct file *filp = stp->st_vfs_file;
1656 struct inode *inode = filp->f_dentry->d_inode;
1657 unsigned int share_access;
1658 int status;
1659
1660 set_access(&share_access, stp->st_access_bmap);
1661 share_access = ~share_access;
1662 share_access &= open->op_share_access;
1663
1664 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1665 return nfsd4_truncate(rqstp, cur_fh, open);
1666
1667 status = get_write_access(inode);
1668 if (status)
1669 return nfserrno(status);
1670 status = nfsd4_truncate(rqstp, cur_fh, open);
1671 if (status) {
1672 put_write_access(inode);
1673 return status;
1674 }
1675 /* remember the open */
1676 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1677 set_bit(open->op_share_access, &stp->st_access_bmap);
1678 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1679
1680 return nfs_ok;
1681}
1682
1683
1684/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1685static void
1686nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1687{
1688 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1689 if (*status)
1690 *status = nfserr_reclaim_bad;
1691 else {
1692 open->op_stateowner->so_confirmed = 1;
1693 open->op_stateowner->so_seqid--;
1694 }
1695 }
1696}
1697
1698/*
1699 * Attempt to hand out a delegation.
1700 */
1701static void
1702nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1703{
1704 struct nfs4_delegation *dp;
1705 struct nfs4_stateowner *sop = stp->st_stateowner;
1706 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1707 struct file_lock fl, *flp = &fl;
1708 int status, flag = 0;
1709
1710 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1711 open->op_recall = 0;
1712 switch (open->op_claim_type) {
1713 case NFS4_OPEN_CLAIM_PREVIOUS:
1714 if (!atomic_read(&cb->cb_set))
1715 open->op_recall = 1;
1716 flag = open->op_delegate_type;
1717 if (flag == NFS4_OPEN_DELEGATE_NONE)
1718 goto out;
1719 break;
1720 case NFS4_OPEN_CLAIM_NULL:
1721 /* Let's not give out any delegations till everyone's
1722 * had the chance to reclaim theirs.... */
1723 if (nfs4_in_grace())
1724 goto out;
1725 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1726 goto out;
1727 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1728 flag = NFS4_OPEN_DELEGATE_WRITE;
1729 else
1730 flag = NFS4_OPEN_DELEGATE_READ;
1731 break;
1732 default:
1733 goto out;
1734 }
1da177e4
LT		 1735
1736 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1737 if (dp == NULL) {
1738 flag = NFS4_OPEN_DELEGATE_NONE;
1739 goto out;
1740 }
1741 locks_init_lock(&fl);
1742 fl.fl_lmops = &nfsd_lease_mng_ops;
1743 fl.fl_flags = FL_LEASE;
1744 fl.fl_end = OFFSET_MAX;
1745 fl.fl_owner = (fl_owner_t)dp;
1746 fl.fl_file = stp->st_vfs_file;
1747 fl.fl_pid = current->tgid;
1748
1749 /* setlease checks to see if delegation should be handed out.
1750 * the lock_manager callbacks fl_mylease and fl_change are used
1751 */
1752 if ((status = setlease(stp->st_vfs_file,
1753 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1754 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1755 unhash_delegation(dp);
1da177e4
LT		 1756 flag = NFS4_OPEN_DELEGATE_NONE;
1757 goto out;
1758 }
1759
1760 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1761
1762 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1763 dp->dl_stateid.si_boot,
1764 dp->dl_stateid.si_stateownerid,
1765 dp->dl_stateid.si_fileid,
1766 dp->dl_stateid.si_generation);
1767out:
7b190fec
N		 1768 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1769 && flag == NFS4_OPEN_DELEGATE_NONE
1770 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1771 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1772 open->op_delegate_type = flag;
1773}
1774
1775/*
1776 * called with nfs4_lock_state() held.
1777 */
1778int
1779nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1780{
1781 struct nfs4_file *fp = NULL;
1782 struct inode *ino = current_fh->fh_dentry->d_inode;
1783 struct nfs4_stateid *stp = NULL;
567d9829 1784 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1785 int status;
1786
1787 status = nfserr_inval;
1788 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1789 goto out;
1790 /*
1791 * Lookup file; if found, lookup stateid and check open request,
1792 * and check for delegations in the process of being recalled.
1793 * If not found, create the nfs4_file struct
1794 */
1795 fp = find_file(ino);
1796 if (fp) {
1797 if ((status = nfs4_check_open(fp, open, &stp)))
1798 goto out;
c44c5eeb
N		 1799 status = nfs4_check_deleg(fp, open, &dp);
1800 if (status)
1801 goto out;
1da177e4 1802 } else {
c44c5eeb
N		 1803 status = nfserr_bad_stateid;
1804 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1805 goto out;
1da177e4
LT		 1806 status = nfserr_resource;
1807 fp = alloc_init_file(ino);
1808 if (fp == NULL)
1809 goto out;
1810 }
1811
1812 /*
1813 * OPEN the file, or upgrade an existing OPEN.
1814 * If truncate fails, the OPEN fails.
1815 */
1816 if (stp) {
1817 /* Stateid was found, this is an OPEN upgrade */
1818 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1819 if (status)
1820 goto out;
1821 } else {
1822 /* Stateid was not found, this is a new OPEN */
1823 int flags = 0;
1824 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1825 flags = MAY_WRITE;
1826 else
1827 flags = MAY_READ;
567d9829
N		 1828 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1829 if (status)
1da177e4
LT		 1830 goto out;
1831 init_stateid(stp, fp, open);
1832 status = nfsd4_truncate(rqstp, current_fh, open);
1833 if (status) {
1834 release_stateid(stp, OPEN_STATE);
1835 goto out;
1836 }
1837 }
1838 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1839
1840 /*
1841 * Attempt to hand out a delegation. No error return, because the
1842 * OPEN succeeds even if we fail.
1843 */
1844 nfs4_open_delegation(current_fh, open, stp);
1845
1846 status = nfs_ok;
1847
1848 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1849 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1850 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1851out:
13cd2184
N		 1852 if (fp)
1853 put_nfs4_file(fp);
1da177e4
LT		 1854 /* CLAIM_PREVIOUS has different error returns */
1855 nfs4_set_claim_prev(open, &status);
1856 /*
1857 * To finish the open response, we just need to set the rflags.
1858 */
1859 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1860 if (!open->op_stateowner->so_confirmed)
1861 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1862
1863 return status;
1864}
1865
58da282b 1866static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1867static struct work_struct laundromat_work;
1868static void laundromat_main(void *);
1869static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1870
1871int
1872nfsd4_renew(clientid_t *clid)
1873{
1874 struct nfs4_client *clp;
1875 int status;
1876
1877 nfs4_lock_state();
1878 dprintk("process_renew(%08x/%08x): starting\n",
1879 clid->cl_boot, clid->cl_id);
1880 status = nfserr_stale_clientid;
1881 if (STALE_CLIENTID(clid))
1882 goto out;
1883 clp = find_confirmed_client(clid);
1884 status = nfserr_expired;
1885 if (clp == NULL) {
1886 /* We assume the client took too long to RENEW. */
1887 dprintk("nfsd4_renew: clientid not found!\n");
1888 goto out;
1889 }
1890 renew_client(clp);
1891 status = nfserr_cb_path_down;
ea1da636 1892 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1893 && !atomic_read(&clp->cl_callback.cb_set))
1894 goto out;
1895 status = nfs_ok;
1896out:
1897 nfs4_unlock_state();
1898 return status;
1899}
1900
a76b4319
N		 1901static void
1902end_grace(void)
1903{
1904 dprintk("NFSD: end of grace period\n");
1905 in_grace = 0;
1906}
1907
fd39ca9a 1908static time_t
1da177e4
LT		 1909nfs4_laundromat(void)
1910{
1911 struct nfs4_client *clp;
1912 struct nfs4_stateowner *sop;
1913 struct nfs4_delegation *dp;
1914 struct list_head *pos, *next, reaplist;
1915 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1916 time_t t, clientid_val = NFSD_LEASE_TIME;
1917 time_t u, test_val = NFSD_LEASE_TIME;
1918
1919 nfs4_lock_state();
1920
1921 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1922 if (in_grace)
1923 end_grace();
1da177e4
LT		 1924 list_for_each_safe(pos, next, &client_lru) {
1925 clp = list_entry(pos, struct nfs4_client, cl_lru);
1926 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1927 t = clp->cl_time - cutoff;
1928 if (clientid_val > t)
1929 clientid_val = t;
1930 break;
1931 }
1932 dprintk("NFSD: purging unused client (clientid %08x)\n",
1933 clp->cl_clientid.cl_id);
1934 expire_client(clp);
1935 }
1936 INIT_LIST_HEAD(&reaplist);
1937 spin_lock(&recall_lock);
1938 list_for_each_safe(pos, next, &del_recall_lru) {
1939 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1940 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1941 u = dp->dl_time - cutoff;
1942 if (test_val > u)
1943 test_val = u;
1944 break;
1945 }
1946 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1947 dp, dp->dl_flock);
1948 list_move(&dp->dl_recall_lru, &reaplist);
1949 }
1950 spin_unlock(&recall_lock);
1951 list_for_each_safe(pos, next, &reaplist) {
1952 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1953 list_del_init(&dp->dl_recall_lru);
1954 unhash_delegation(dp);
1955 }
1956 test_val = NFSD_LEASE_TIME;
1957 list_for_each_safe(pos, next, &close_lru) {
1958 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1959 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1960 u = sop->so_time - cutoff;
1961 if (test_val > u)
1962 test_val = u;
1963 break;
1964 }
1965 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1966 sop->so_id);
1967 list_del(&sop->so_close_lru);
1968 nfs4_put_stateowner(sop);
1969 }
1970 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1971 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1972 nfs4_unlock_state();
1973 return clientid_val;
1974}
1975
1976void
1977laundromat_main(void *not_used)
1978{
1979 time_t t;
1980
1981 t = nfs4_laundromat();
1982 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1983 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1984}
1985
1986/* search ownerid_hashtbl[] and close_lru for stateid owner
1987 * (stateid->si_stateownerid)
1988 */
fd39ca9a 1989static struct nfs4_stateowner *
1da177e4
LT		 1990find_openstateowner_id(u32 st_id, int flags) {
1991 struct nfs4_stateowner *local = NULL;
1992
1993 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1994 if (flags & CLOSE_STATE) {
1995 list_for_each_entry(local, &close_lru, so_close_lru) {
1996 if (local->so_id == st_id)
1997 return local;
1998 }
1999 }
2000 return NULL;
2001}
2002
2003static inline int
2004nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2005{
2006 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2007}
2008
2009static int
2010STALE_STATEID(stateid_t *stateid)
2011{
2012 if (stateid->si_boot == boot_time)
2013 return 0;
2014 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2015 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2016 stateid->si_generation);
2017 return 1;
2018}
2019
2020static inline int
2021access_permit_read(unsigned long access_bmap)
2022{
2023 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2024 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2025 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2026}
2027
2028static inline int
2029access_permit_write(unsigned long access_bmap)
2030{
2031 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2032 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2033}
2034
2035static
2036int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2037{
2038 int status = nfserr_openmode;
2039
2040 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2041 goto out;
2042 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2043 goto out;
2044 status = nfs_ok;
2045out:
2046 return status;
2047}
2048
1da177e4
LT		 2049static inline int
2050check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2051{
2052 /* Trying to call delegreturn with a special stateid? Yuch: */
2053 if (!(flags & (RD_STATE | WR_STATE)))
2054 return nfserr_bad_stateid;
2055 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2056 return nfs_ok;
2057 else if (nfs4_in_grace()) {
2058 /* Answer in remaining cases depends on existance of
2059 * conflicting state; so we must wait out the grace period. */
2060 return nfserr_grace;
2061 } else if (flags & WR_STATE)
2062 return nfs4_share_conflict(current_fh,
2063 NFS4_SHARE_DENY_WRITE);
2064 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2065 return nfs4_share_conflict(current_fh,
2066 NFS4_SHARE_DENY_READ);
2067}
2068
2069/*
2070 * Allow READ/WRITE during grace period on recovered state only for files
2071 * that are not able to provide mandatory locking.
2072 */
2073static inline int
2074io_during_grace_disallowed(struct inode *inode, int flags)
2075{
2076 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2077 && MANDATORY_LOCK(inode);
2078}
2079
2080/*
2081* Checks for stateid operations
2082*/
2083int
2084nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2085{
2086 struct nfs4_stateid *stp = NULL;
2087 struct nfs4_delegation *dp = NULL;
2088 stateid_t *stidp;
2089 struct inode *ino = current_fh->fh_dentry->d_inode;
2090 int status;
2091
2092 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2093 stateid->si_boot, stateid->si_stateownerid,
2094 stateid->si_fileid, stateid->si_generation);
2095 if (filpp)
2096 *filpp = NULL;
2097
2098 if (io_during_grace_disallowed(ino, flags))
2099 return nfserr_grace;
2100
2101 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2102 return check_special_stateids(current_fh, stateid, flags);
2103
2104 /* STALE STATEID */
2105 status = nfserr_stale_stateid;
2106 if (STALE_STATEID(stateid))
2107 goto out;
2108
2109 /* BAD STATEID */
2110 status = nfserr_bad_stateid;
2111 if (!stateid->si_fileid) { /* delegation stateid */
2112 if(!(dp = find_delegation_stateid(ino, stateid))) {
2113 dprintk("NFSD: delegation stateid not found\n");
2114 if (nfs4_in_grace())
2115 status = nfserr_grace;
2116 goto out;
2117 }
2118 stidp = &dp->dl_stateid;
2119 } else { /* open or lock stateid */
2120 if (!(stp = find_stateid(stateid, flags))) {
2121 dprintk("NFSD: open or lock stateid not found\n");
2122 if (nfs4_in_grace())
2123 status = nfserr_grace;
2124 goto out;
2125 }
2126 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2127 goto out;
2128 if (!stp->st_stateowner->so_confirmed)
2129 goto out;
2130 stidp = &stp->st_stateid;
2131 }
2132 if (stateid->si_generation > stidp->si_generation)
2133 goto out;
2134
2135 /* OLD STATEID */
2136 status = nfserr_old_stateid;
2137 if (stateid->si_generation < stidp->si_generation)
2138 goto out;
2139 if (stp) {
2140 if ((status = nfs4_check_openmode(stp,flags)))
2141 goto out;
2142 renew_client(stp->st_stateowner->so_client);
2143 if (filpp)
2144 *filpp = stp->st_vfs_file;
2145 } else if (dp) {
2146 if ((status = nfs4_check_delegmode(dp, flags)))
2147 goto out;
2148 renew_client(dp->dl_client);
2149 if (flags & DELEG_RET)
2150 unhash_delegation(dp);
2151 if (filpp)
2152 *filpp = dp->dl_vfs_file;
2153 }
2154 status = nfs_ok;
2155out:
2156 return status;
2157}
2158
2159
2160/*
2161 * Checks for sequence id mutating operations.
2162 */
fd39ca9a 2163static int
1da177e4
LT		 2164nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
2165{
2166 int status;
2167 struct nfs4_stateid *stp;
2168 struct nfs4_stateowner *sop;
2169
2170 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2171 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2172 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2173 stateid->si_generation);
2174
2175 *stpp = NULL;
2176 *sopp = NULL;
2177
2178 status = nfserr_bad_stateid;
2179 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2180 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2181 goto out;
2182 }
2183
2184 status = nfserr_stale_stateid;
2185 if (STALE_STATEID(stateid))
2186 goto out;
2187 /*
2188 * We return BAD_STATEID if filehandle doesn't match stateid,
2189 * the confirmed flag is incorrecly set, or the generation
2190 * number is incorrect.
2191 * If there is no entry in the openfile table for this id,
2192 * we can't always return BAD_STATEID;
2193 * this might be a retransmitted CLOSE which has arrived after
2194 * the openfile has been released.
2195 */
2196 if (!(stp = find_stateid(stateid, flags)))
2197 goto no_nfs4_stateid;
2198
2199 status = nfserr_bad_stateid;
2200
2201 /* for new lock stateowners:
2202 * check that the lock->v.new.open_stateid
2203 * refers to an open stateowner
2204 *
2205 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2206 * as the open_stateid->st_stateowner->so_client->clientid
2207 */
2208 if (lockclid) {
2209 struct nfs4_stateowner *sop = stp->st_stateowner;
2210 struct nfs4_client *clp = sop->so_client;
2211
2212 if (!sop->so_is_open_owner)
2213 goto out;
2214 if (!cmp_clid(&clp->cl_clientid, lockclid))
2215 goto out;
2216 }
2217
2218 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2219 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2220 goto out;
2221 }
2222
2223 *stpp = stp;
2224 *sopp = sop = stp->st_stateowner;
2225
2226 /*
2227 * We now validate the seqid and stateid generation numbers.
2228 * For the moment, we ignore the possibility of
2229 * generation number wraparound.
2230 */
2231 if (seqid != sop->so_seqid + 1)
2232 goto check_replay;
2233
2234 if (sop->so_confirmed) {
2235 if (flags & CONFIRM) {
2236 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2237 goto out;
2238 }
2239 }
2240 else {
2241 if (!(flags & CONFIRM)) {
2242 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2243 goto out;
2244 }
2245 }
2246 if (stateid->si_generation > stp->st_stateid.si_generation) {
2247 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2248 goto out;
2249 }
2250
2251 status = nfserr_old_stateid;
2252 if (stateid->si_generation < stp->st_stateid.si_generation) {
2253 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2254 goto out;
2255 }
2256 /* XXX renew the client lease here */
2257 status = nfs_ok;
2258
2259out:
2260 return status;
2261
2262no_nfs4_stateid:
2263
2264 /*
2265 * We determine whether this is a bad stateid or a replay,
2266 * starting by trying to look up the stateowner.
2267 * If stateowner is not found - stateid is bad.
2268 */
2269 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2270 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2271 status = nfserr_bad_stateid;
2272 goto out;
2273 }
2274 *sopp = sop;
2275
2276check_replay:
2277 if (seqid == sop->so_seqid) {
2278 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2279 /* indicate replay to calling function */
2280 status = NFSERR_REPLAY_ME;
2281 } else {
2282 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2283
2284 *sopp = NULL;
2285 status = nfserr_bad_seqid;
2286 }
2287 goto out;
2288}
2289
2290int
2291nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2292{
2293 int status;
2294 struct nfs4_stateowner *sop;
2295 struct nfs4_stateid *stp;
2296
2297 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2298 (int)current_fh->fh_dentry->d_name.len,
2299 current_fh->fh_dentry->d_name.name);
2300
2301 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2302 goto out;
2303
2304 nfs4_lock_state();
2305
2306 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2307 &oc->oc_req_stateid,
2308 CHECK_FH | CONFIRM | OPEN_STATE,
2309 &oc->oc_stateowner, &stp, NULL)))
2310 goto out;
2311
2312 sop = oc->oc_stateowner;
2313 sop->so_confirmed = 1;
2314 update_stateid(&stp->st_stateid);
2315 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2316 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2317 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2318 stp->st_stateid.si_boot,
2319 stp->st_stateid.si_stateownerid,
2320 stp->st_stateid.si_fileid,
2321 stp->st_stateid.si_generation);
2322out:
2323 if (oc->oc_stateowner)
2324 nfs4_get_stateowner(oc->oc_stateowner);
2325 nfs4_unlock_state();
2326 return status;
2327}
2328
2329
2330/*
2331 * unset all bits in union bitmap (bmap) that
2332 * do not exist in share (from successful OPEN_DOWNGRADE)
2333 */
2334static void
2335reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2336{
2337 int i;
2338 for (i = 1; i < 4; i++) {
2339 if ((i & access) != i)
2340 __clear_bit(i, bmap);
2341 }
2342}
2343
2344static void
2345reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2346{
2347 int i;
2348 for (i = 0; i < 4; i++) {
2349 if ((i & deny) != i)
2350 __clear_bit(i, bmap);
2351 }
2352}
2353
2354int
2355nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2356{
2357 int status;
2358 struct nfs4_stateid *stp;
2359 unsigned int share_access;
2360
2361 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2362 (int)current_fh->fh_dentry->d_name.len,
2363 current_fh->fh_dentry->d_name.name);
2364
2365 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2366 return nfserr_inval;
2367
2368 nfs4_lock_state();
2369 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2370 &od->od_stateid,
2371 CHECK_FH | OPEN_STATE,
2372 &od->od_stateowner, &stp, NULL)))
2373 goto out;
2374
2375 status = nfserr_inval;
2376 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2377 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2378 stp->st_access_bmap, od->od_share_access);
2379 goto out;
2380 }
2381 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2382 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2383 stp->st_deny_bmap, od->od_share_deny);
2384 goto out;
2385 }
2386 set_access(&share_access, stp->st_access_bmap);
2387 nfs4_file_downgrade(stp->st_vfs_file,
2388 share_access & ~od->od_share_access);
2389
2390 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2391 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2392
2393 update_stateid(&stp->st_stateid);
2394 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2395 status = nfs_ok;
2396out:
2397 if (od->od_stateowner)
2398 nfs4_get_stateowner(od->od_stateowner);
2399 nfs4_unlock_state();
2400 return status;
2401}
2402
2403/*
2404 * nfs4_unlock_state() called after encode
2405 */
2406int
2407nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2408{
2409 int status;
2410 struct nfs4_stateid *stp;
2411
2412 dprintk("NFSD: nfsd4_close on file %.*s\n",
2413 (int)current_fh->fh_dentry->d_name.len,
2414 current_fh->fh_dentry->d_name.name);
2415
2416 nfs4_lock_state();
2417 /* check close_lru for replay */
2418 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2419 &close->cl_stateid,
2420 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2421 &close->cl_stateowner, &stp, NULL)))
2422 goto out;
2423 /*
2424 * Return success, but first update the stateid.
2425 */
2426 status = nfs_ok;
2427 update_stateid(&stp->st_stateid);
2428 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2429
2430 /* release_state_owner() calls nfsd_close() if needed */
2431 release_state_owner(stp, OPEN_STATE);
2432out:
2433 if (close->cl_stateowner)
2434 nfs4_get_stateowner(close->cl_stateowner);
2435 nfs4_unlock_state();
2436 return status;
2437}
2438
2439int
2440nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2441{
2442 int status;
2443
2444 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2445 goto out;
2446
2447 nfs4_lock_state();
2448 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2449 nfs4_unlock_state();
2450out:
2451 return status;
2452}
2453
2454
2455/*
2456 * Lock owner state (byte-range locks)
2457 */
2458#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2459#define LOCK_HASH_BITS 8
2460#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2461#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2462
2463#define lockownerid_hashval(id) \
2464 ((id) & LOCK_HASH_MASK)
2465
2466static inline unsigned int
2467lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2468 struct xdr_netobj *ownername)
2469{
2470 return (file_hashval(inode) + cl_id
2471 + opaque_hashval(ownername->data, ownername->len))
2472 & LOCK_HASH_MASK;
2473}
2474
2475static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2476static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2477static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2478
fd39ca9a 2479static struct nfs4_stateid *
1da177e4
LT		 2480find_stateid(stateid_t *stid, int flags)
2481{
2482 struct nfs4_stateid *local = NULL;
2483 u32 st_id = stid->si_stateownerid;
2484 u32 f_id = stid->si_fileid;
2485 unsigned int hashval;
2486
2487 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2488 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2489 hashval = stateid_hashval(st_id, f_id);
2490 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2491 if ((local->st_stateid.si_stateownerid == st_id) &&
2492 (local->st_stateid.si_fileid == f_id))
2493 return local;
2494 }
2495 }
2496 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2497 hashval = stateid_hashval(st_id, f_id);
2498 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2499 if ((local->st_stateid.si_stateownerid == st_id) &&
2500 (local->st_stateid.si_fileid == f_id))
2501 return local;
2502 }
2503 } else
2504 printk("NFSD: find_stateid: ERROR: no state flag\n");
2505 return NULL;
2506}
2507
2508static struct nfs4_delegation *
2509find_delegation_stateid(struct inode *ino, stateid_t *stid)
2510{
13cd2184
N		 2511 struct nfs4_file *fp;
2512 struct nfs4_delegation *dl;
1da177e4
LT		 2513
2514 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2515 stid->si_boot, stid->si_stateownerid,
2516 stid->si_fileid, stid->si_generation);
2517
1da177e4 2518 fp = find_file(ino);
13cd2184
N		 2519 if (!fp)
2520 return NULL;
2521 dl = find_delegation_file(fp, stid);
2522 put_nfs4_file(fp);
2523 return dl;
1da177e4
LT		 2524}
2525
2526/*
2527 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2528 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2529 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2530 * locking, this prevents us from being completely protocol-compliant. The
2531 * real solution to this problem is to start using unsigned file offsets in
2532 * the VFS, but this is a very deep change!
2533 */
2534static inline void
2535nfs4_transform_lock_offset(struct file_lock *lock)
2536{
2537 if (lock->fl_start < 0)
2538 lock->fl_start = OFFSET_MAX;
2539 if (lock->fl_end < 0)
2540 lock->fl_end = OFFSET_MAX;
2541}
2542
fd39ca9a 2543static int
1da177e4
LT		 2544nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2545{
2546 struct nfs4_stateowner *local = NULL;
2547 int status = 0;
2548
2549 if (hashval >= LOCK_HASH_SIZE)
2550 goto out;
2551 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2552 if (local == sop) {
2553 status = 1;
2554 goto out;
2555 }
2556 }
2557out:
2558 return status;
2559}
2560
2561
2562static inline void
2563nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2564{
2565 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2566 unsigned int hval = lockownerid_hashval(sop->so_id);
2567
2568 deny->ld_sop = NULL;
2569 if (nfs4_verify_lock_stateowner(sop, hval)) {
2570 kref_get(&sop->so_ref);
2571 deny->ld_sop = sop;
2572 deny->ld_clientid = sop->so_client->cl_clientid;
2573 }
2574 deny->ld_start = fl->fl_start;
2575 deny->ld_length = ~(u64)0;
2576 if (fl->fl_end != ~(u64)0)
2577 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2578 deny->ld_type = NFS4_READ_LT;
2579 if (fl->fl_type != F_RDLCK)
2580 deny->ld_type = NFS4_WRITE_LT;
2581}
2582
1da177e4
LT		 2583static struct nfs4_stateowner *
2584find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2585 struct xdr_netobj *owner)
2586{
2587 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2588 struct nfs4_stateowner *op;
2589
2590 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2591 if (cmp_owner_str(op, owner, clid))
2592 return op;
2593 }
2594 return NULL;
2595}
2596
2597/*
2598 * Alloc a lock owner structure.
2599 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2600 * occured.
2601 *
2602 * strhashval = lock_ownerstr_hashval
2603 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2604 */
2605
2606static struct nfs4_stateowner *
2607alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2608 struct nfs4_stateowner *sop;
2609 struct nfs4_replay *rp;
2610 unsigned int idhashval;
2611
2612 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2613 return NULL;
2614 idhashval = lockownerid_hashval(current_ownerid);
2615 INIT_LIST_HEAD(&sop->so_idhash);
2616 INIT_LIST_HEAD(&sop->so_strhash);
2617 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2618 INIT_LIST_HEAD(&sop->so_stateids);
2619 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2620 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2621 sop->so_time = 0;
2622 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2623 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2624 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2625 sop->so_is_open_owner = 0;
2626 sop->so_id = current_ownerid++;
2627 sop->so_client = clp;
2628 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2629 sop->so_confirmed = 1;
2630 rp = &sop->so_replay;
2631 rp->rp_status = NFSERR_SERVERFAULT;
2632 rp->rp_buflen = 0;
2633 rp->rp_buf = rp->rp_ibuf;
2634 return sop;
2635}
2636
fd39ca9a 2637static struct nfs4_stateid *
1da177e4
LT		 2638alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2639{
2640 struct nfs4_stateid *stp;
2641 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2642
5ac049ac
N		 2643 stp = nfs4_alloc_stateid();
2644 if (stp == NULL)
1da177e4
LT		 2645 goto out;
2646 INIT_LIST_HEAD(&stp->st_hash);
2647 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2648 INIT_LIST_HEAD(&stp->st_perstateowner);
2649 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2650 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2651 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2652 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2653 stp->st_stateowner = sop;
13cd2184 2654 get_nfs4_file(fp);
1da177e4
LT		 2655 stp->st_file = fp;
2656 stp->st_stateid.si_boot = boot_time;
2657 stp->st_stateid.si_stateownerid = sop->so_id;
2658 stp->st_stateid.si_fileid = fp->fi_id;
2659 stp->st_stateid.si_generation = 0;
2660 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2661 stp->st_access_bmap = open_stp->st_access_bmap;
2662 stp->st_deny_bmap = open_stp->st_deny_bmap;
2663
2664out:
2665 return stp;
2666}
2667
fd39ca9a 2668static int
1da177e4
LT		 2669check_lock_length(u64 offset, u64 length)
2670{
2671 return ((length == 0) || ((length != ~(u64)0) &&
2672 LOFF_OVERFLOW(offset, length)));
2673}
2674
2675/*
2676 * LOCK operation
2677 */
2678int
2679nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2680{
3e9e3dbe 2681 struct nfs4_stateowner *open_sop = NULL;
1da177e4
LT		 2682 struct nfs4_stateid *lock_stp;
2683 struct file *filp;
2684 struct file_lock file_lock;
2685 struct file_lock *conflock;
2686 int status = 0;
2687 unsigned int strhashval;
2688
2689 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2690 (long long) lock->lk_offset,
2691 (long long) lock->lk_length);
2692
2693 if (nfs4_in_grace() && !lock->lk_reclaim)
2694 return nfserr_grace;
2695 if (!nfs4_in_grace() && lock->lk_reclaim)
2696 return nfserr_no_grace;
2697
2698 if (check_lock_length(lock->lk_offset, lock->lk_length))
2699 return nfserr_inval;
2700
2701 nfs4_lock_state();
2702
2703 if (lock->lk_is_new) {
2704 /*
2705 * Client indicates that this is a new lockowner.
2706 * Use open owner and open stateid to create lock owner and lock
2707 * stateid.
2708 */
2709 struct nfs4_stateid *open_stp = NULL;
2710 struct nfs4_file *fp;
2711
2712 status = nfserr_stale_clientid;
2713 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2714 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2715 goto out;
2716 }
2717
2718 /* is the new lock seqid presented by the client zero? */
2719 status = nfserr_bad_seqid;
2720 if (lock->v.new.lock_seqid != 0)
2721 goto out;
2722
2723 /* validate and update open stateid and open seqid */
2724 status = nfs4_preprocess_seqid_op(current_fh,
2725 lock->lk_new_open_seqid,
2726 &lock->lk_new_open_stateid,
2727 CHECK_FH | OPEN_STATE,
2728 &open_sop, &open_stp,
2729 &lock->v.new.clientid);
2730 if (status) {
2731 if (lock->lk_reclaim)
2732 status = nfserr_reclaim_bad;
2733 goto out;
2734 }
2735 /* create lockowner and lock stateid */
2736 fp = open_stp->st_file;
2737 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2738 open_sop->so_client->cl_clientid.cl_id,
2739 &lock->v.new.owner);
3e9e3dbe
N		 2740 /* XXX: Do we need to check for duplicate stateowners on
2741 * the same file, or should they just be allowed (and
2742 * create new stateids)? */
1da177e4
LT		 2743 status = nfserr_resource;
2744 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2745 goto out;
2746 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2747 fp, open_stp)) == NULL) {
2748 release_stateowner(lock->lk_stateowner);
2749 lock->lk_stateowner = NULL;
2750 goto out;
2751 }
2752 /* bump the open seqid used to create the lock */
2753 open_sop->so_seqid++;
2754 } else {
2755 /* lock (lock owner + lock stateid) already exists */
2756 status = nfs4_preprocess_seqid_op(current_fh,
2757 lock->lk_old_lock_seqid,
2758 &lock->lk_old_lock_stateid,
2759 CHECK_FH | LOCK_STATE,
2760 &lock->lk_stateowner, &lock_stp, NULL);
2761 if (status)
2762 goto out;
2763 }
2764 /* lock->lk_stateowner and lock_stp have been created or found */
2765 filp = lock_stp->st_vfs_file;
2766
2767 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2768 printk("NFSD: nfsd4_lock: permission denied!\n");
2769 goto out;
2770 }
2771
2772 locks_init_lock(&file_lock);
2773 switch (lock->lk_type) {
2774 case NFS4_READ_LT:
2775 case NFS4_READW_LT:
2776 file_lock.fl_type = F_RDLCK;
2777 break;
2778 case NFS4_WRITE_LT:
2779 case NFS4_WRITEW_LT:
2780 file_lock.fl_type = F_WRLCK;
2781 break;
2782 default:
2783 status = nfserr_inval;
2784 goto out;
2785 }
2786 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2787 file_lock.fl_pid = current->tgid;
2788 file_lock.fl_file = filp;
2789 file_lock.fl_flags = FL_POSIX;
2790
2791 file_lock.fl_start = lock->lk_offset;
2792 if ((lock->lk_length == ~(u64)0) ||
2793 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2794 file_lock.fl_end = ~(u64)0;
2795 else
2796 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2797 nfs4_transform_lock_offset(&file_lock);
2798
2799 /*
2800 * Try to lock the file in the VFS.
2801 * Note: locks.c uses the BKL to protect the inode's lock list.
2802 */
2803
2804 status = posix_lock_file(filp, &file_lock);
2805 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2806 file_lock.fl_ops->fl_release_private(&file_lock);
2807 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2808 switch (-status) {
2809 case 0: /* success! */
2810 update_stateid(&lock_stp->st_stateid);
2811 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2812 sizeof(stateid_t));
2813 goto out;
2814 case (EAGAIN):
2815 goto conflicting_lock;
2816 case (EDEADLK):
2817 status = nfserr_deadlock;
2818 default:
2819 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2820 goto out_destroy_new_stateid;
2821 }
2822
2823conflicting_lock:
2824 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2825 status = nfserr_denied;
2826 /* XXX There is a race here. Future patch needed to provide
2827 * an atomic posix_lock_and_test_file
2828 */
2829 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2830 status = nfserr_serverfault;
2831 goto out;
2832 }
2833 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2834
2835out_destroy_new_stateid:
2836 if (lock->lk_is_new) {
2837 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2838 /*
2839 * An error encountered after instantiation of the new
2840 * stateid has forced us to destroy it.
2841 */
2842 if (!seqid_mutating_err(status))
2843 open_sop->so_seqid--;
2844
2845 release_state_owner(lock_stp, LOCK_STATE);
2846 }
2847out:
2848 if (lock->lk_stateowner)
2849 nfs4_get_stateowner(lock->lk_stateowner);
2850 nfs4_unlock_state();
2851 return status;
2852}
2853
2854/*
2855 * LOCKT operation
2856 */
2857int
2858nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2859{
2860 struct inode *inode;
2861 struct file file;
2862 struct file_lock file_lock;
2863 struct file_lock *conflicting_lock;
2864 int status;
2865
2866 if (nfs4_in_grace())
2867 return nfserr_grace;
2868
2869 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2870 return nfserr_inval;
2871
2872 lockt->lt_stateowner = NULL;
2873 nfs4_lock_state();
2874
2875 status = nfserr_stale_clientid;
2876 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2877 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2878 goto out;
2879 }
2880
2881 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2882 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2883 if (status == nfserr_symlink)
2884 status = nfserr_inval;
2885 goto out;
2886 }
2887
2888 inode = current_fh->fh_dentry->d_inode;
2889 locks_init_lock(&file_lock);
2890 switch (lockt->lt_type) {
2891 case NFS4_READ_LT:
2892 case NFS4_READW_LT:
2893 file_lock.fl_type = F_RDLCK;
2894 break;
2895 case NFS4_WRITE_LT:
2896 case NFS4_WRITEW_LT:
2897 file_lock.fl_type = F_WRLCK;
2898 break;
2899 default:
2900 printk("NFSD: nfs4_lockt: bad lock type!\n");
2901 status = nfserr_inval;
2902 goto out;
2903 }
2904
2905 lockt->lt_stateowner = find_lockstateowner_str(inode,
2906 &lockt->lt_clientid, &lockt->lt_owner);
2907 if (lockt->lt_stateowner)
2908 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2909 file_lock.fl_pid = current->tgid;
2910 file_lock.fl_flags = FL_POSIX;
2911
2912 file_lock.fl_start = lockt->lt_offset;
2913 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2914 file_lock.fl_end = ~(u64)0;
2915 else
2916 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2917
2918 nfs4_transform_lock_offset(&file_lock);
2919
2920 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2921 * since LOCKT doesn't require an OPEN, and therefore a struct
2922 * file may not exist, pass posix_test_lock a struct file with
2923 * only the dentry:inode set.
2924 */
2925 memset(&file, 0, sizeof (struct file));
2926 file.f_dentry = current_fh->fh_dentry;
2927
2928 status = nfs_ok;
2929 conflicting_lock = posix_test_lock(&file, &file_lock);
2930 if (conflicting_lock) {
2931 status = nfserr_denied;
2932 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2933 }
2934out:
2935 nfs4_unlock_state();
2936 return status;
2937}
2938
2939int
2940nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2941{
2942 struct nfs4_stateid *stp;
2943 struct file *filp = NULL;
2944 struct file_lock file_lock;
2945 int status;
2946
2947 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2948 (long long) locku->lu_offset,
2949 (long long) locku->lu_length);
2950
2951 if (check_lock_length(locku->lu_offset, locku->lu_length))
2952 return nfserr_inval;
2953
2954 nfs4_lock_state();
2955
2956 if ((status = nfs4_preprocess_seqid_op(current_fh,
2957 locku->lu_seqid,
2958 &locku->lu_stateid,
2959 CHECK_FH | LOCK_STATE,
2960 &locku->lu_stateowner, &stp, NULL)))
2961 goto out;
2962
2963 filp = stp->st_vfs_file;
2964 BUG_ON(!filp);
2965 locks_init_lock(&file_lock);
2966 file_lock.fl_type = F_UNLCK;
2967 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2968 file_lock.fl_pid = current->tgid;
2969 file_lock.fl_file = filp;
2970 file_lock.fl_flags = FL_POSIX;
2971 file_lock.fl_start = locku->lu_offset;
2972
2973 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2974 file_lock.fl_end = ~(u64)0;
2975 else
2976 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2977 nfs4_transform_lock_offset(&file_lock);
2978
2979 /*
2980 * Try to unlock the file in the VFS.
2981 */
2982 status = posix_lock_file(filp, &file_lock);
2983 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2984 file_lock.fl_ops->fl_release_private(&file_lock);
2985 if (status) {
2986 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2987 goto out_nfserr;
2988 }
2989 /*
2990 * OK, unlock succeeded; the only thing left to do is update the stateid.
2991 */
2992 update_stateid(&stp->st_stateid);
2993 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2994
2995out:
2996 if (locku->lu_stateowner)
2997 nfs4_get_stateowner(locku->lu_stateowner);
2998 nfs4_unlock_state();
2999 return status;
3000
3001out_nfserr:
3002 status = nfserrno(status);
3003 goto out;
3004}
3005
3006/*
3007 * returns
3008 * 1: locks held by lockowner
3009 * 0: no locks held by lockowner
3010 */
3011static int
3012check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3013{
3014 struct file_lock **flpp;
3015 struct inode *inode = filp->f_dentry->d_inode;
3016 int status = 0;
3017
3018 lock_kernel();
3019 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3020 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3021 status = 1;
3022 goto out;
3023 }
3024out:
3025 unlock_kernel();
3026 return status;
3027}
3028
3029int
3030nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3031{
3032 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3033 struct nfs4_stateowner *sop;
3034 struct nfs4_stateid *stp;
1da177e4 3035 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3036 struct list_head matches;
3037 int i;
1da177e4
LT		 3038 int status;
3039
3040 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3041 clid->cl_boot, clid->cl_id);
3042
3043 /* XXX check for lease expiration */
3044
3045 status = nfserr_stale_clientid;
3046 if (STALE_CLIENTID(clid)) {
3047 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3048 return status;
3049 }
3050
3051 nfs4_lock_state();
3052
3e9e3dbe
N		 3053 status = nfserr_locks_held;
3054 /* XXX: we're doing a linear search through all the lockowners.
3055 * Yipes! For now we'll just hope clients aren't really using
3056 * release_lockowner much, but eventually we have to fix these
3057 * data structures. */
3058 INIT_LIST_HEAD(&matches);
3059 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3060 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3061 if (!cmp_owner_str(sop, owner, clid))
3062 continue;
3063 list_for_each_entry(stp, &sop->so_stateids,
3064 st_perstateowner) {
3065 if (check_for_locks(stp->st_vfs_file, sop))
3066 goto out;
3067 /* Note: so_perclient unused for lockowners,
3068 * so it's OK to fool with here. */
3069 list_add(&sop->so_perclient, &matches);
3070 }
1da177e4 3071 }
3e9e3dbe
N		 3072 }
3073 /* Clients probably won't expect us to return with some (but not all)
3074 * of the lockowner state released; so don't release any until all
3075 * have been checked. */
3076 status = nfs_ok;
3077 list_for_each_entry(sop, &matches, so_perclient) {
3078 release_stateowner(sop);
1da177e4
LT		 3079 }
3080out:
3081 nfs4_unlock_state();
3082 return status;
3083}
3084
3085static inline struct nfs4_client_reclaim *
a55370a3 3086alloc_reclaim(void)
1da177e4 3087{
a55370a3 3088 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3089}
3090
3091/*
3092 * failure => all reset bets are off, nfserr_no_grace...
3093 */
3094static int
a55370a3 3095nfs4_client_to_reclaim(char *name)
1da177e4
LT		 3096{
3097 unsigned int strhashval;
3098 struct nfs4_client_reclaim *crp = NULL;
3099
a55370a3
N		 3100 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3101 crp = alloc_reclaim();
1da177e4
LT		 3102 if (!crp)
3103 return 0;
a55370a3 3104 strhashval = clientstr_hashval(name);
1da177e4
LT		 3105 INIT_LIST_HEAD(&crp->cr_strhash);
3106 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3107 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3108 reclaim_str_hashtbl_size++;
3109 return 1;
3110}
3111
3112static void
3113nfs4_release_reclaim(void)
3114{
3115 struct nfs4_client_reclaim *crp = NULL;
3116 int i;
3117
1da177e4
LT		 3118 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3119 while (!list_empty(&reclaim_str_hashtbl[i])) {
3120 crp = list_entry(reclaim_str_hashtbl[i].next,
3121 struct nfs4_client_reclaim, cr_strhash);
3122 list_del(&crp->cr_strhash);
1da177e4
LT		 3123 kfree(crp);
3124 reclaim_str_hashtbl_size--;
3125 }
3126 }
3127 BUG_ON(reclaim_str_hashtbl_size);
3128}
3129
3130/*
3131 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3132static struct nfs4_client_reclaim *
1da177e4
LT		 3133nfs4_find_reclaim_client(clientid_t *clid)
3134{
3135 unsigned int strhashval;
3136 struct nfs4_client *clp;
3137 struct nfs4_client_reclaim *crp = NULL;
3138
3139
3140 /* find clientid in conf_id_hashtbl */
3141 clp = find_confirmed_client(clid);
3142 if (clp == NULL)
3143 return NULL;
3144
a55370a3
N		 3145 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3146 clp->cl_name.len, clp->cl_name.data,
3147 clp->cl_recdir);
1da177e4
LT		 3148
3149 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3150 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3151 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3152 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3153 return crp;
3154 }
3155 }
3156 return NULL;
3157}
3158
3159/*
3160* Called from OPEN. Look for clientid in reclaim list.
3161*/
3162int
3163nfs4_check_open_reclaim(clientid_t *clid)
3164{
dfc83565 3165 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3166}
3167
ac4d8ff2 3168/* initialization to perform at module load time: */
1da177e4 3169
ac4d8ff2
N		 3170void
3171nfs4_state_init(void)
1da177e4
LT		 3172{
3173 int i;
1da177e4 3174
1da177e4
LT		 3175 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3176 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3177 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3178 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3179 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3180 }
3181 for (i = 0; i < FILE_HASH_SIZE; i++) {
3182 INIT_LIST_HEAD(&file_hashtbl[i]);
3183 }
3184 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3185 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3186 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3187 }
3188 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3189 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3190 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3191 }
3192 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3193 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3194 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3195 }
1da177e4 3196 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3197 INIT_LIST_HEAD(&close_lru);
3198 INIT_LIST_HEAD(&client_lru);
3199 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3200 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3201 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3202 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3203}
3204
3205/* initialization to perform when the nfsd service is started: */
3206
3207static void
3208__nfs4_state_start(void)
3209{
3210 time_t grace_time;
3211
1da177e4 3212 boot_time = get_seconds();
d99a05ad
N		 3213 grace_time = max(user_lease_time, lease_time);
3214 lease_time = user_lease_time;
a76b4319 3215 in_grace = 1;
d99a05ad 3216 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3217 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3218 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3219}
3220
3221int
76a3550e 3222nfs4_state_start(void)
1da177e4
LT		 3223{
3224 int status;
3225
3226 if (nfs4_init)
3227 return 0;
3228 status = nfsd4_init_slabs();
3229 if (status)
3230 return status;
76a3550e 3231 __nfs4_state_start();
1da177e4
LT		 3232 nfs4_init = 1;
3233 return 0;
3234}
3235
3236int
3237nfs4_in_grace(void)
3238{
a76b4319 3239 return in_grace;
1da177e4
LT		 3240}
3241
3242time_t
3243nfs4_lease_time(void)
3244{
3245 return lease_time;
3246}
3247
3248static void
3249__nfs4_state_shutdown(void)
3250{
3251 int i;
3252 struct nfs4_client *clp = NULL;
3253 struct nfs4_delegation *dp = NULL;
3254 struct nfs4_stateowner *sop = NULL;
3255 struct list_head *pos, *next, reaplist;
3256
3257 list_for_each_safe(pos, next, &close_lru) {
3258 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3259 list_del(&sop->so_close_lru);
3260 nfs4_put_stateowner(sop);
3261 }
3262
3263 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3264 while (!list_empty(&conf_id_hashtbl[i])) {
3265 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3266 expire_client(clp);
3267 }
3268 while (!list_empty(&unconf_str_hashtbl[i])) {
3269 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3270 expire_client(clp);
3271 }
3272 }
3273 INIT_LIST_HEAD(&reaplist);
3274 spin_lock(&recall_lock);
3275 list_for_each_safe(pos, next, &del_recall_lru) {
3276 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3277 list_move(&dp->dl_recall_lru, &reaplist);
3278 }
3279 spin_unlock(&recall_lock);
3280 list_for_each_safe(pos, next, &reaplist) {
3281 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3282 list_del_init(&dp->dl_recall_lru);
3283 unhash_delegation(dp);
3284 }
3285
1da177e4 3286 cancel_delayed_work(&laundromat_work);
58da282b
N		 3287 flush_workqueue(laundry_wq);
3288 destroy_workqueue(laundry_wq);
1da177e4 3289 nfs4_init = 0;
1da177e4
LT		 3290}
3291
3292void
3293nfs4_state_shutdown(void)
3294{
3295 nfs4_lock_state();
3296 nfs4_release_reclaim();
3297 __nfs4_state_shutdown();
3298 nfsd4_free_slabs();
3299 nfs4_unlock_state();
3300}
3301
3302/*
3303 * Called when leasetime is changed.
3304 *
d99a05ad
N		 3305 * The only way the protocol gives us to handle on-the-fly lease changes is to
3306 * simulate a reboot. Instead of doing that, we just wait till the next time
3307 * we start to register any changes in lease time. If the administrator
3308 * really wants to change the lease time *now*, they can go ahead and bring
3309 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3310 */
3311void
3312nfs4_reset_lease(time_t leasetime)
3313{
d99a05ad
N		 3314 lock_kernel();
3315 user_lease_time = leasetime;
3316 unlock_kernel();
1da177e4 3317}
Linux 6.x block layer and io_uring tree(s)