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[PATCH] knfsd: nfsd4: setclientid_confirm gotoectomy
[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
LT		 156 return dp;
157 INIT_LIST_HEAD(&dp->dl_del_perfile);
158 INIT_LIST_HEAD(&dp->dl_del_perclnt);
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);
8beefa24 179 list_add(&dp->dl_del_perfile, &fp->fi_delegations);
1da177e4 180 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
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{
217 list_del_init(&dp->dl_del_perfile);
218 list_del_init(&dp->dl_del_perclnt);
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);
348 while (!list_empty(&clp->cl_del_perclnt)) {
349 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
350 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
351 dp->dl_flock);
352 list_del_init(&dp->dl_del_perclnt);
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);
364 while (!list_empty(&clp->cl_perclient)) {
365 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
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);
380 clp->cl_callback.cb_parsed = 0;
381 INIT_LIST_HEAD(&clp->cl_idhash);
382 INIT_LIST_HEAD(&clp->cl_strhash);
383 INIT_LIST_HEAD(&clp->cl_perclient);
384 INIT_LIST_HEAD(&clp->cl_del_perclnt);
385 INIT_LIST_HEAD(&clp->cl_lru);
386out:
387 return clp;
388}
389
390static void
391copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
392 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
393}
394
395static void
396copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
397 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
398 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
399}
400
401static void
402copy_cred(struct svc_cred *target, struct svc_cred *source) {
403
404 target->cr_uid = source->cr_uid;
405 target->cr_gid = source->cr_gid;
406 target->cr_group_info = source->cr_group_info;
407 get_group_info(target->cr_group_info);
408}
409
a55370a3
N		 410static inline int
411same_name(const char *n1, const char *n2) {
412 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 413}
414
415static int
416cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
417 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
418}
419
420static int
421cmp_clid(clientid_t * cl1, clientid_t * cl2) {
422 return((cl1->cl_boot == cl2->cl_boot) &&
423 (cl1->cl_id == cl2->cl_id));
424}
425
426/* XXX what about NGROUP */
427static int
428cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
429 return(cr1->cr_uid == cr2->cr_uid);
430
431}
432
433static void
434gen_clid(struct nfs4_client *clp) {
435 clp->cl_clientid.cl_boot = boot_time;
436 clp->cl_clientid.cl_id = current_clientid++;
437}
438
439static void
440gen_confirm(struct nfs4_client *clp) {
441 struct timespec tv;
442 u32 * p;
443
444 tv = CURRENT_TIME;
445 p = (u32 *)clp->cl_confirm.data;
446 *p++ = tv.tv_sec;
447 *p++ = tv.tv_nsec;
448}
449
450static int
451check_name(struct xdr_netobj name) {
452
453 if (name.len == 0)
454 return 0;
455 if (name.len > NFS4_OPAQUE_LIMIT) {
456 printk("NFSD: check_name: name too long(%d)!\n", name.len);
457 return 0;
458 }
459 return 1;
460}
461
fd39ca9a 462static void
1da177e4
LT		 463add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
464{
465 unsigned int idhashval;
466
467 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
468 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
469 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
470 list_add_tail(&clp->cl_lru, &client_lru);
471 clp->cl_time = get_seconds();
472}
473
fd39ca9a 474static void
1da177e4
LT		 475move_to_confirmed(struct nfs4_client *clp)
476{
477 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
478 unsigned int strhashval;
479
480 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
481 list_del_init(&clp->cl_strhash);
482 list_del_init(&clp->cl_idhash);
483 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 484 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 485 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
486 renew_client(clp);
487}
488
489static struct nfs4_client *
490find_confirmed_client(clientid_t *clid)
491{
492 struct nfs4_client *clp;
493 unsigned int idhashval = clientid_hashval(clid->cl_id);
494
495 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
496 if (cmp_clid(&clp->cl_clientid, clid))
497 return clp;
498 }
499 return NULL;
500}
501
502static struct nfs4_client *
503find_unconfirmed_client(clientid_t *clid)
504{
505 struct nfs4_client *clp;
506 unsigned int idhashval = clientid_hashval(clid->cl_id);
507
508 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
509 if (cmp_clid(&clp->cl_clientid, clid))
510 return clp;
511 }
512 return NULL;
513}
514
28ce6054
N		 515static struct nfs4_client *
516find_confirmed_client_by_str(const char *dname, unsigned int hashval)
517{
518 struct nfs4_client *clp;
519
520 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
521 if (same_name(clp->cl_recdir, dname))
522 return clp;
523 }
524 return NULL;
525}
526
527static struct nfs4_client *
528find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
529{
530 struct nfs4_client *clp;
531
532 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
533 if (same_name(clp->cl_recdir, dname))
534 return clp;
535 }
536 return NULL;
537}
538
1da177e4
LT		 539/* a helper function for parse_callback */
540static int
541parse_octet(unsigned int *lenp, char **addrp)
542{
543 unsigned int len = *lenp;
544 char *p = *addrp;
545 int n = -1;
546 char c;
547
548 for (;;) {
549 if (!len)
550 break;
551 len--;
552 c = *p++;
553 if (c == '.')
554 break;
555 if ((c < '0') || (c > '9')) {
556 n = -1;
557 break;
558 }
559 if (n < 0)
560 n = 0;
561 n = (n * 10) + (c - '0');
562 if (n > 255) {
563 n = -1;
564 break;
565 }
566 }
567 *lenp = len;
568 *addrp = p;
569 return n;
570}
571
572/* parse and set the setclientid ipv4 callback address */
fd39ca9a 573static int
1da177e4
LT		 574parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
575{
576 int temp = 0;
577 u32 cbaddr = 0;
578 u16 cbport = 0;
579 u32 addrlen = addr_len;
580 char *addr = addr_val;
581 int i, shift;
582
583 /* ipaddress */
584 shift = 24;
585 for(i = 4; i > 0 ; i--) {
586 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
587 return 0;
588 }
589 cbaddr |= (temp << shift);
590 if (shift > 0)
591 shift -= 8;
592 }
593 *cbaddrp = cbaddr;
594
595 /* port */
596 shift = 8;
597 for(i = 2; i > 0 ; i--) {
598 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
599 return 0;
600 }
601 cbport |= (temp << shift);
602 if (shift > 0)
603 shift -= 8;
604 }
605 *cbportp = cbport;
606 return 1;
607}
608
fd39ca9a 609static void
1da177e4
LT		 610gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
611{
612 struct nfs4_callback *cb = &clp->cl_callback;
613
614 /* Currently, we only support tcp for the callback channel */
615 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
616 goto out_err;
617
618 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
619 &cb->cb_addr, &cb->cb_port)))
620 goto out_err;
621 cb->cb_prog = se->se_callback_prog;
622 cb->cb_ident = se->se_callback_ident;
623 cb->cb_parsed = 1;
624 return;
625out_err:
626 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
627 "will not receive delegations\n",
628 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
629
630 cb->cb_parsed = 0;
631 return;
632}
633
634/*
635 * RFC 3010 has a complex implmentation description of processing a
636 * SETCLIENTID request consisting of 5 bullets, labeled as
637 * CASE0 - CASE4 below.
638 *
639 * NOTES:
640 * callback information will be processed in a future patch
641 *
642 * an unconfirmed record is added when:
643 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644 * CASE 1: confirmed record found with matching name, principal,
645 * verifier, and clientid.
646 * CASE 2: confirmed record found with matching name, principal,
647 * and there is no unconfirmed record with matching
648 * name and principal
649 *
650 * an unconfirmed record is replaced when:
651 * CASE 3: confirmed record found with matching name, principal,
652 * and an unconfirmed record is found with matching
653 * name, principal, and with clientid and
654 * confirm that does not match the confirmed record.
655 * CASE 4: there is no confirmed record with matching name and
656 * principal. there is an unconfirmed record with
657 * matching name, principal.
658 *
659 * an unconfirmed record is deleted when:
660 * CASE 1: an unconfirmed record that matches input name, verifier,
661 * and confirmed clientid.
662 * CASE 4: any unconfirmed records with matching name and principal
663 * that exist after an unconfirmed record has been replaced
664 * as described above.
665 *
666 */
667int
668nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669{
670 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671 struct xdr_netobj clname = {
672 .len = setclid->se_namelen,
673 .data = setclid->se_name,
674 };
675 nfs4_verifier clverifier = setclid->se_verf;
676 unsigned int strhashval;
28ce6054 677 struct nfs4_client *conf, *unconf, *new;
1da177e4 678 int status;
a55370a3 679 char dname[HEXDIR_LEN];
1da177e4
LT		 680
681 status = nfserr_inval;
682 if (!check_name(clname))
683 goto out;
684
a55370a3
N		 685 status = nfs4_make_rec_clidname(dname, &clname);
686 if (status)
687 goto out;
688
1da177e4
LT		 689 /*
690 * XXX The Duplicate Request Cache (DRC) has been checked (??)
691 * We get here on a DRC miss.
692 */
693
a55370a3 694 strhashval = clientstr_hashval(dname);
1da177e4 695
1da177e4 696 nfs4_lock_state();
28ce6054
N		 697 conf = find_confirmed_client_by_str(dname, strhashval);
698 if (conf) {
1da177e4
LT		 699 /*
700 * CASE 0:
701 * clname match, confirmed, different principal
702 * or different ip_address
703 */
704 status = nfserr_clid_inuse;
28ce6054
N		 705 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706 || conf->cl_addr != ip_addr) {
1da177e4
LT		 707 printk("NFSD: setclientid: string in use by client"
708 "(clientid %08x/%08x)\n",
28ce6054 709 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 710 goto out;
711 }
1da177e4 712 }
28ce6054 713 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 714 status = nfserr_resource;
715 if (!conf) {
716 /*
717 * CASE 4:
718 * placed first, because it is the normal case.
719 */
720 if (unconf)
721 expire_client(unconf);
a55370a3
N		 722 new = create_client(clname, dname);
723 if (new == NULL)
1da177e4
LT		 724 goto out;
725 copy_verf(new, &clverifier);
726 new->cl_addr = ip_addr;
727 copy_cred(&new->cl_cred,&rqstp->rq_cred);
728 gen_clid(new);
729 gen_confirm(new);
730 gen_callback(new, setclid);
731 add_to_unconfirmed(new, strhashval);
732 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
733 /*
734 * CASE 1:
735 * cl_name match, confirmed, principal match
736 * verifier match: probable callback update
737 *
738 * remove any unconfirmed nfs4_client with
739 * matching cl_name, cl_verifier, and cl_clientid
740 *
741 * create and insert an unconfirmed nfs4_client with same
742 * cl_name, cl_verifier, and cl_clientid as existing
743 * nfs4_client, but with the new callback info and a
744 * new cl_confirm
745 */
31f4a6c1
N		 746 if (unconf) {
747 /* Note this is removing unconfirmed {*x***},
748 * which is stronger than RFC recommended {vxc**}.
749 * This has the advantage that there is at most
750 * one {*x***} in either list at any time.
751 */
752 expire_client(unconf);
1da177e4 753 }
a55370a3
N		 754 new = create_client(clname, dname);
755 if (new == NULL)
1da177e4
LT		 756 goto out;
757 copy_verf(new,&conf->cl_verifier);
758 new->cl_addr = ip_addr;
759 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760 copy_clid(new, conf);
761 gen_confirm(new);
762 gen_callback(new, setclid);
763 add_to_unconfirmed(new,strhashval);
764 } else if (!unconf) {
765 /*
766 * CASE 2:
767 * clname match, confirmed, principal match
768 * verfier does not match
769 * no unconfirmed. create a new unconfirmed nfs4_client
770 * using input clverifier, clname, and callback info
771 * and generate a new cl_clientid and cl_confirm.
772 */
a55370a3
N		 773 new = create_client(clname, dname);
774 if (new == NULL)
1da177e4
LT		 775 goto out;
776 copy_verf(new,&clverifier);
777 new->cl_addr = ip_addr;
778 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779 gen_clid(new);
780 gen_confirm(new);
781 gen_callback(new, setclid);
782 add_to_unconfirmed(new, strhashval);
783 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
784 /*
785 * CASE3:
786 * confirmed found (name, principal match)
787 * confirmed verifier does not match input clverifier
788 *
789 * unconfirmed found (name match)
790 * confirmed->cl_confirm != unconfirmed->cl_confirm
791 *
792 * remove unconfirmed.
793 *
794 * create an unconfirmed nfs4_client
795 * with same cl_name as existing confirmed nfs4_client,
796 * but with new callback info, new cl_clientid,
797 * new cl_verifier and a new cl_confirm
798 */
799 expire_client(unconf);
a55370a3
N		 800 new = create_client(clname, dname);
801 if (new == NULL)
1da177e4
LT		 802 goto out;
803 copy_verf(new,&clverifier);
804 new->cl_addr = ip_addr;
805 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806 gen_clid(new);
807 gen_confirm(new);
808 gen_callback(new, setclid);
809 add_to_unconfirmed(new, strhashval);
810 } else {
811 /* No cases hit !!! */
812 status = nfserr_inval;
813 goto out;
814
815 }
816 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
817 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
818 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
819 status = nfs_ok;
820out:
821 nfs4_unlock_state();
822 return status;
823}
824
825
826/*
827 * RFC 3010 has a complex implmentation description of processing a
828 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
829 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
830 *
831 * NOTE: callback information will be processed here in a future patch
832 */
833int
834nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
835{
836 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
837 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
838 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
839 clientid_t * clid = &setclientid_confirm->sc_clientid;
840 int status;
841
842 if (STALE_CLIENTID(clid))
843 return nfserr_stale_clientid;
844 /*
845 * XXX The Duplicate Request Cache (DRC) has been checked (??)
846 * We get here on a DRC miss.
847 */
848
849 nfs4_lock_state();
850 clp = find_confirmed_client(clid);
851 if (clp) {
22de4d83 852 status = nfserr_clid_inuse;
1da177e4
LT		 853 if (clp->cl_addr != ip_addr) {
854 printk("NFSD: setclientid: string in use by client"
855 "(clientid %08x/%08x)\n",
856 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
857 goto out;
858 }
859 conf = clp;
860 }
861 clp = find_unconfirmed_client(clid);
862 if (clp) {
22de4d83 863 status = nfserr_clid_inuse;
1da177e4
LT		 864 if (clp->cl_addr != ip_addr) {
865 printk("NFSD: setclientid: string in use by client"
866 "(clientid %08x/%08x)\n",
867 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
868 goto out;
869 }
870 unconf = clp;
871 }
872 /* CASE 1:
873 * unconf record that matches input clientid and input confirm.
874 * conf record that matches input clientid.
875 * conf and unconf records match names, verifiers
876 */
877 if ((conf && unconf) &&
878 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
879 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 880 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4
LT		 881 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
882 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
883 status = nfserr_clid_inuse;
884 else {
1a69c179
N		 885 /* XXX: We just turn off callbacks until we can handle
886 * change request correctly. */
887 clp = conf;
888 clp->cl_callback.cb_parsed = 0;
889 gen_confirm(clp);
890 expire_client(unconf);
1da177e4 891 status = nfs_ok;
1a69c179 892
1da177e4 893 }
1da177e4
LT		 894 }
895 /* CASE 2:
896 * conf record that matches input clientid.
897 * if unconf record that matches input clientid, then unconf->cl_name
898 * or unconf->cl_verifier don't match the conf record.
899 */
08e8987c 900 else if ((conf && !unconf) ||
1da177e4
LT		 901 ((conf && unconf) &&
902 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 903 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
1da177e4
LT		 904 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
905 status = nfserr_clid_inuse;
906 } else {
907 clp = conf;
908 status = nfs_ok;
909 }
1da177e4
LT		 910 }
911 /* CASE 3:
912 * conf record not found.
913 * unconf record found.
914 * unconf->cl_confirm matches input confirm
915 */
08e8987c 916 else if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
1da177e4
LT		 917 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
918 status = nfserr_clid_inuse;
919 } else {
1a69c179
N		 920 unsigned int hash =
921 clientstr_hashval(unconf->cl_recdir);
922 conf = find_confirmed_client_by_str(unconf->cl_recdir,
923 hash);
924 if (conf) {
925 expire_client(conf);
926 }
1da177e4
LT		 927 clp = unconf;
928 move_to_confirmed(unconf);
1a69c179 929 status = nfs_ok;
1da177e4 930 }
1da177e4
LT		 931 }
932 /* CASE 4:
933 * conf record not found, or if conf, then conf->cl_confirm does not
934 * match input confirm.
935 * unconf record not found, or if unconf, then unconf->cl_confirm
936 * does not match input confirm.
937 */
08e8987c 938 else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
1da177e4
LT		 939 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
940 status = nfserr_stale_clientid;
1da177e4 941 }
08e8987c
N		 942 else {
943 /* check that we have hit one of the cases...*/
944 status = nfserr_clid_inuse;
945 }
1da177e4
LT		 946out:
947 if (!status)
948 nfsd4_probe_callback(clp);
949 nfs4_unlock_state();
950 return status;
951}
952
953/*
954 * Open owner state (share locks)
955 */
956
957/* hash tables for nfs4_stateowner */
958#define OWNER_HASH_BITS 8
959#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
960#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
961
962#define ownerid_hashval(id) \
963 ((id) & OWNER_HASH_MASK)
964#define ownerstr_hashval(clientid, ownername) \
965 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
966
967static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
968static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
969
970/* hash table for nfs4_file */
971#define FILE_HASH_BITS 8
972#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
973#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
974/* hash table for (open)nfs4_stateid */
975#define STATEID_HASH_BITS 10
976#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
977#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
978
979#define file_hashval(x) \
980 hash_ptr(x, FILE_HASH_BITS)
981#define stateid_hashval(owner_id, file_id) \
982 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
983
984static struct list_head file_hashtbl[FILE_HASH_SIZE];
985static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
986
987/* OPEN Share state helper functions */
988static inline struct nfs4_file *
989alloc_init_file(struct inode *ino)
990{
991 struct nfs4_file *fp;
992 unsigned int hashval = file_hashval(ino);
993
e60d4398
N		 994 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
995 if (fp) {
13cd2184 996 kref_init(&fp->fi_ref);
1da177e4 997 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 998 INIT_LIST_HEAD(&fp->fi_stateids);
999 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1000 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1001 fp->fi_inode = igrab(ino);
1002 fp->fi_id = current_fileid++;
1da177e4
LT		 1003 return fp;
1004 }
1005 return NULL;
1006}
1007
e60d4398
N		 1008static void
1009nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 1010{
e60d4398
N		 1011 int status;
1012
1013 if (*slab == NULL)
1014 return;
1015 status = kmem_cache_destroy(*slab);
1016 *slab = NULL;
1017 WARN_ON(status);
1da177e4
LT		 1018}
1019
1020static void
1021nfsd4_free_slabs(void)
1022{
e60d4398
N		 1023 nfsd4_free_slab(&stateowner_slab);
1024 nfsd4_free_slab(&file_slab);
5ac049ac 1025 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1026 nfsd4_free_slab(&deleg_slab);
e60d4398 1027}
1da177e4 1028
e60d4398
N		 1029static int
1030nfsd4_init_slabs(void)
1031{
1032 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1033 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1034 if (stateowner_slab == NULL)
1035 goto out_nomem;
1036 file_slab = kmem_cache_create("nfsd4_files",
1037 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1038 if (file_slab == NULL)
1039 goto out_nomem;
5ac049ac
N		 1040 stateid_slab = kmem_cache_create("nfsd4_stateids",
1041 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1042 if (stateid_slab == NULL)
1043 goto out_nomem;
5b2d21c1
N		 1044 deleg_slab = kmem_cache_create("nfsd4_delegations",
1045 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1046 if (deleg_slab == NULL)
1047 goto out_nomem;
e60d4398
N		 1048 return 0;
1049out_nomem:
1050 nfsd4_free_slabs();
1051 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1052 return -ENOMEM;
1da177e4
LT		 1053}
1054
1055void
1056nfs4_free_stateowner(struct kref *kref)
1057{
1058 struct nfs4_stateowner *sop =
1059 container_of(kref, struct nfs4_stateowner, so_ref);
1060 kfree(sop->so_owner.data);
1061 kmem_cache_free(stateowner_slab, sop);
1062}
1063
1064static inline struct nfs4_stateowner *
1065alloc_stateowner(struct xdr_netobj *owner)
1066{
1067 struct nfs4_stateowner *sop;
1068
1069 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1070 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1071 memcpy(sop->so_owner.data, owner->data, owner->len);
1072 sop->so_owner.len = owner->len;
1073 kref_init(&sop->so_ref);
1074 return sop;
1075 }
1076 kmem_cache_free(stateowner_slab, sop);
1077 }
1078 return NULL;
1079}
1080
1081static struct nfs4_stateowner *
1082alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1083 struct nfs4_stateowner *sop;
1084 struct nfs4_replay *rp;
1085 unsigned int idhashval;
1086
1087 if (!(sop = alloc_stateowner(&open->op_owner)))
1088 return NULL;
1089 idhashval = ownerid_hashval(current_ownerid);
1090 INIT_LIST_HEAD(&sop->so_idhash);
1091 INIT_LIST_HEAD(&sop->so_strhash);
1092 INIT_LIST_HEAD(&sop->so_perclient);
1093 INIT_LIST_HEAD(&sop->so_perfilestate);
1094 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1095 INIT_LIST_HEAD(&sop->so_close_lru);
1096 sop->so_time = 0;
1097 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1098 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1099 list_add(&sop->so_perclient, &clp->cl_perclient);
1da177e4
LT		 1100 sop->so_is_open_owner = 1;
1101 sop->so_id = current_ownerid++;
1102 sop->so_client = clp;
1103 sop->so_seqid = open->op_seqid;
1104 sop->so_confirmed = 0;
1105 rp = &sop->so_replay;
1106 rp->rp_status = NFSERR_SERVERFAULT;
1107 rp->rp_buflen = 0;
1108 rp->rp_buf = rp->rp_ibuf;
1109 return sop;
1110}
1111
1112static void
1113release_stateid_lockowners(struct nfs4_stateid *open_stp)
1114{
1115 struct nfs4_stateowner *lock_sop;
1116
1117 while (!list_empty(&open_stp->st_perlockowner)) {
1118 lock_sop = list_entry(open_stp->st_perlockowner.next,
1119 struct nfs4_stateowner, so_perlockowner);
1120 /* list_del(&open_stp->st_perlockowner); */
1121 BUG_ON(lock_sop->so_is_open_owner);
1122 release_stateowner(lock_sop);
1123 }
1124}
1125
1126static void
1127unhash_stateowner(struct nfs4_stateowner *sop)
1128{
1129 struct nfs4_stateid *stp;
1130
1131 list_del(&sop->so_idhash);
1132 list_del(&sop->so_strhash);
6fa305de 1133 if (sop->so_is_open_owner)
1da177e4 1134 list_del(&sop->so_perclient);
1da177e4
LT		 1135 list_del(&sop->so_perlockowner);
1136 while (!list_empty(&sop->so_perfilestate)) {
1137 stp = list_entry(sop->so_perfilestate.next,
1138 struct nfs4_stateid, st_perfilestate);
1139 if (sop->so_is_open_owner)
1140 release_stateid(stp, OPEN_STATE);
1141 else
1142 release_stateid(stp, LOCK_STATE);
1143 }
1144}
1145
1146static void
1147release_stateowner(struct nfs4_stateowner *sop)
1148{
1149 unhash_stateowner(sop);
1150 list_del(&sop->so_close_lru);
1151 nfs4_put_stateowner(sop);
1152}
1153
1154static inline void
1155init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1156 struct nfs4_stateowner *sop = open->op_stateowner;
1157 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1158
1159 INIT_LIST_HEAD(&stp->st_hash);
1160 INIT_LIST_HEAD(&stp->st_perfilestate);
1161 INIT_LIST_HEAD(&stp->st_perlockowner);
1162 INIT_LIST_HEAD(&stp->st_perfile);
1163 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1164 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
8beefa24 1165 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1166 stp->st_stateowner = sop;
13cd2184 1167 get_nfs4_file(fp);
1da177e4
LT		 1168 stp->st_file = fp;
1169 stp->st_stateid.si_boot = boot_time;
1170 stp->st_stateid.si_stateownerid = sop->so_id;
1171 stp->st_stateid.si_fileid = fp->fi_id;
1172 stp->st_stateid.si_generation = 0;
1173 stp->st_access_bmap = 0;
1174 stp->st_deny_bmap = 0;
1175 __set_bit(open->op_share_access, &stp->st_access_bmap);
1176 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1177}
1178
1179static void
1180release_stateid(struct nfs4_stateid *stp, int flags)
1181{
1182 struct file *filp = stp->st_vfs_file;
1183
1184 list_del(&stp->st_hash);
1da177e4
LT		 1185 list_del(&stp->st_perfile);
1186 list_del(&stp->st_perfilestate);
1187 if (flags & OPEN_STATE) {
1188 release_stateid_lockowners(stp);
1189 stp->st_vfs_file = NULL;
1190 nfsd_close(filp);
1da177e4
LT		 1191 } else if (flags & LOCK_STATE)
1192 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1193 put_nfs4_file(stp->st_file);
5ac049ac 1194 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1195 stp = NULL;
1196}
1197
fd39ca9a 1198static void
1da177e4
LT		 1199move_to_close_lru(struct nfs4_stateowner *sop)
1200{
1201 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1202
1203 unhash_stateowner(sop);
1204 list_add_tail(&sop->so_close_lru, &close_lru);
1205 sop->so_time = get_seconds();
1206}
1207
fd39ca9a 1208static void
1da177e4
LT		 1209release_state_owner(struct nfs4_stateid *stp, int flag)
1210{
1211 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1212
1213 dprintk("NFSD: release_state_owner\n");
1214 release_stateid(stp, flag);
1215
1216 /* place unused nfs4_stateowners on so_close_lru list to be
1217 * released by the laundromat service after the lease period
1218 * to enable us to handle CLOSE replay
1219 */
1220 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1221 move_to_close_lru(sop);
1da177e4
LT		 1222}
1223
1224static int
1225cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1226 return ((sop->so_owner.len == owner->len) &&
1227 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1228 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1229}
1230
1231static struct nfs4_stateowner *
1232find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1233{
1234 struct nfs4_stateowner *so = NULL;
1235
1236 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1237 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1238 return so;
1239 }
1240 return NULL;
1241}
1242
1243/* search file_hashtbl[] for file */
1244static struct nfs4_file *
1245find_file(struct inode *ino)
1246{
1247 unsigned int hashval = file_hashval(ino);
1248 struct nfs4_file *fp;
1249
1250 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1251 if (fp->fi_inode == ino) {
1252 get_nfs4_file(fp);
1da177e4 1253 return fp;
13cd2184 1254 }
1da177e4
LT		 1255 }
1256 return NULL;
1257}
1258
1259#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1260#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1261
fd39ca9a 1262static void
1da177e4
LT		 1263set_access(unsigned int *access, unsigned long bmap) {
1264 int i;
1265
1266 *access = 0;
1267 for (i = 1; i < 4; i++) {
1268 if (test_bit(i, &bmap))
1269 *access |= i;
1270 }
1271}
1272
fd39ca9a 1273static void
1da177e4
LT		 1274set_deny(unsigned int *deny, unsigned long bmap) {
1275 int i;
1276
1277 *deny = 0;
1278 for (i = 0; i < 4; i++) {
1279 if (test_bit(i, &bmap))
1280 *deny |= i ;
1281 }
1282}
1283
1284static int
1285test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1286 unsigned int access, deny;
1287
1288 set_access(&access, stp->st_access_bmap);
1289 set_deny(&deny, stp->st_deny_bmap);
1290 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1291 return 0;
1292 return 1;
1293}
1294
1295/*
1296 * Called to check deny when READ with all zero stateid or
1297 * WRITE with all zero or all one stateid
1298 */
fd39ca9a 1299static int
1da177e4
LT		 1300nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1301{
1302 struct inode *ino = current_fh->fh_dentry->d_inode;
1303 struct nfs4_file *fp;
1304 struct nfs4_stateid *stp;
13cd2184 1305 int ret;
1da177e4
LT		 1306
1307 dprintk("NFSD: nfs4_share_conflict\n");
1308
1309 fp = find_file(ino);
13cd2184
N		 1310 if (!fp)
1311 return nfs_ok;
1312 ret = nfserr_share_denied;
1da177e4 1313 /* Search for conflicting share reservations */
13cd2184
N		 1314 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1315 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1316 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1317 goto out;
1da177e4 1318 }
13cd2184
N		 1319 ret = nfs_ok;
1320out:
1321 put_nfs4_file(fp);
1322 return ret;
1da177e4
LT		 1323}
1324
1325static inline void
1326nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1327{
1328 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1329 put_write_access(filp->f_dentry->d_inode);
1330 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1331 }
1332}
1333
1334/*
1335 * Recall a delegation
1336 */
1337static int
1338do_recall(void *__dp)
1339{
1340 struct nfs4_delegation *dp = __dp;
1341
1342 daemonize("nfsv4-recall");
1343
1344 nfsd4_cb_recall(dp);
1345 return 0;
1346}
1347
1348/*
1349 * Spawn a thread to perform a recall on the delegation represented
1350 * by the lease (file_lock)
1351 *
1352 * Called from break_lease() with lock_kernel() held.
1353 * Note: we assume break_lease will only call this *once* for any given
1354 * lease.
1355 */
1356static
1357void nfsd_break_deleg_cb(struct file_lock *fl)
1358{
1359 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1360 struct task_struct *t;
1361
1362 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1363 if (!dp)
1364 return;
1365
1366 /* We're assuming the state code never drops its reference
1367 * without first removing the lease. Since we're in this lease
1368 * callback (and since the lease code is serialized by the kernel
1369 * lock) we know the server hasn't removed the lease yet, we know
1370 * it's safe to take a reference: */
1371 atomic_inc(&dp->dl_count);
1372
1373 spin_lock(&recall_lock);
1374 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1375 spin_unlock(&recall_lock);
1376
1377 /* only place dl_time is set. protected by lock_kernel*/
1378 dp->dl_time = get_seconds();
1379
1380 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1381 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1382
1383 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1384 if (IS_ERR(t)) {
1385 struct nfs4_client *clp = dp->dl_client;
1386
1387 printk(KERN_INFO "NFSD: Callback thread failed for "
1388 "for client (clientid %08x/%08x)\n",
1389 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1390 nfs4_put_delegation(dp);
1391 }
1392}
1393
1394/*
1395 * The file_lock is being reapd.
1396 *
1397 * Called by locks_free_lock() with lock_kernel() held.
1398 */
1399static
1400void nfsd_release_deleg_cb(struct file_lock *fl)
1401{
1402 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1403
1404 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1405
1406 if (!(fl->fl_flags & FL_LEASE) || !dp)
1407 return;
1408 dp->dl_flock = NULL;
1409}
1410
1411/*
1412 * Set the delegation file_lock back pointer.
1413 *
1414 * Called from __setlease() with lock_kernel() held.
1415 */
1416static
1417void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1418{
1419 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1420
1421 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1422 if (!dp)
1423 return;
1424 dp->dl_flock = new;
1425}
1426
1427/*
1428 * Called from __setlease() with lock_kernel() held
1429 */
1430static
1431int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1432{
1433 struct nfs4_delegation *onlistd =
1434 (struct nfs4_delegation *)onlist->fl_owner;
1435 struct nfs4_delegation *tryd =
1436 (struct nfs4_delegation *)try->fl_owner;
1437
1438 if (onlist->fl_lmops != try->fl_lmops)
1439 return 0;
1440
1441 return onlistd->dl_client == tryd->dl_client;
1442}
1443
1444
1445static
1446int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1447{
1448 if (arg & F_UNLCK)
1449 return lease_modify(onlist, arg);
1450 else
1451 return -EAGAIN;
1452}
1453
fd39ca9a 1454static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1455 .fl_break = nfsd_break_deleg_cb,
1456 .fl_release_private = nfsd_release_deleg_cb,
1457 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1458 .fl_mylease = nfsd_same_client_deleg_cb,
1459 .fl_change = nfsd_change_deleg_cb,
1460};
1461
1462
1463/*
1464 * nfsd4_process_open1()
1465 * lookup stateowner.
1466 * found:
1467 * check confirmed
1468 * confirmed:
1469 * check seqid
1470 * not confirmed:
1471 * delete owner
1472 * create new owner
1473 * notfound:
1474 * verify clientid
1475 * create new owner
1476 *
1477 * called with nfs4_lock_state() held.
1478 */
1479int
1480nfsd4_process_open1(struct nfsd4_open *open)
1481{
1482 int status;
1483 clientid_t *clientid = &open->op_clientid;
1484 struct nfs4_client *clp = NULL;
1485 unsigned int strhashval;
1486 struct nfs4_stateowner *sop = NULL;
1487
1488 status = nfserr_inval;
1489 if (!check_name(open->op_owner))
1490 goto out;
1491
1492 if (STALE_CLIENTID(&open->op_clientid))
1493 return nfserr_stale_clientid;
1494
1495 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1496 sop = find_openstateowner_str(strhashval, open);
1497 if (sop) {
1498 open->op_stateowner = sop;
1499 /* check for replay */
1500 if (open->op_seqid == sop->so_seqid){
1501 if (sop->so_replay.rp_buflen)
1502 return NFSERR_REPLAY_ME;
1503 else {
1504 /* The original OPEN failed so spectacularly
1505 * that we don't even have replay data saved!
1506 * Therefore, we have no choice but to continue
1507 * processing this OPEN; presumably, we'll
1508 * fail again for the same reason.
1509 */
1510 dprintk("nfsd4_process_open1:"
1511 " replay with no replay cache\n");
1512 goto renew;
1513 }
1514 } else if (sop->so_confirmed) {
1515 if (open->op_seqid == sop->so_seqid + 1)
1516 goto renew;
1517 status = nfserr_bad_seqid;
1518 goto out;
1519 } else {
1520 /* If we get here, we received an OPEN for an
1521 * unconfirmed nfs4_stateowner. Since the seqid's are
1522 * different, purge the existing nfs4_stateowner, and
1523 * instantiate a new one.
1524 */
1525 clp = sop->so_client;
1526 release_stateowner(sop);
1527 }
1528 } else {
1529 /* nfs4_stateowner not found.
1530 * Verify clientid and instantiate new nfs4_stateowner.
1531 * If verify fails this is presumably the result of the
1532 * client's lease expiring.
1533 */
1534 status = nfserr_expired;
1535 clp = find_confirmed_client(clientid);
1536 if (clp == NULL)
1537 goto out;
1538 }
1539 status = nfserr_resource;
1540 sop = alloc_init_open_stateowner(strhashval, clp, open);
1541 if (sop == NULL)
1542 goto out;
1543 open->op_stateowner = sop;
1544renew:
1545 status = nfs_ok;
1546 renew_client(sop->so_client);
1547out:
1548 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1549 status = nfserr_reclaim_bad;
1550 return status;
1551}
1552
4a6e43e6
N		 1553static inline int
1554nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1555{
1556 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1557 return nfserr_openmode;
1558 else
1559 return nfs_ok;
1560}
1561
52f4fb43
N		 1562static struct nfs4_delegation *
1563find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1564{
1565 struct nfs4_delegation *dp;
1566
8beefa24 1567 list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
52f4fb43
N		 1568 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1569 return dp;
1570 }
1571 return NULL;
1572}
1573
c44c5eeb 1574static int
567d9829
N		 1575nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1576 struct nfs4_delegation **dp)
1577{
1578 int flags;
c44c5eeb 1579 int status = nfserr_bad_stateid;
567d9829
N		 1580
1581 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1582 if (*dp == NULL)
c44c5eeb 1583 goto out;
567d9829
N		 1584 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1585 RD_STATE : WR_STATE;
1586 status = nfs4_check_delegmode(*dp, flags);
1587 if (status)
1588 *dp = NULL;
c44c5eeb
N		 1589out:
1590 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1591 return nfs_ok;
1592 if (status)
1593 return status;
1594 open->op_stateowner->so_confirmed = 1;
1595 return nfs_ok;
567d9829
N		 1596}
1597
1da177e4
LT		 1598static int
1599nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1600{
1601 struct nfs4_stateid *local;
1602 int status = nfserr_share_denied;
1603 struct nfs4_stateowner *sop = open->op_stateowner;
1604
8beefa24 1605 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1606 /* ignore lock owners */
1607 if (local->st_stateowner->so_is_open_owner == 0)
1608 continue;
1609 /* remember if we have seen this open owner */
1610 if (local->st_stateowner == sop)
1611 *stpp = local;
1612 /* check for conflicting share reservations */
1613 if (!test_share(local, open))
1614 goto out;
1615 }
1616 status = 0;
1617out:
1618 return status;
1619}
1620
5ac049ac
N		 1621static inline struct nfs4_stateid *
1622nfs4_alloc_stateid(void)
1623{
1624 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1625}
1626
1da177e4
LT		 1627static int
1628nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1629 struct nfs4_delegation *dp,
1da177e4
LT		 1630 struct svc_fh *cur_fh, int flags)
1631{
1632 struct nfs4_stateid *stp;
1da177e4 1633
5ac049ac 1634 stp = nfs4_alloc_stateid();
1da177e4
LT		 1635 if (stp == NULL)
1636 return nfserr_resource;
1637
567d9829
N		 1638 if (dp) {
1639 get_file(dp->dl_vfs_file);
1640 stp->st_vfs_file = dp->dl_vfs_file;
1641 } else {
1642 int status;
1643 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1644 &stp->st_vfs_file);
1645 if (status) {
1646 if (status == nfserr_dropit)
1647 status = nfserr_jukebox;
5ac049ac 1648 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1649 return status;
1650 }
1da177e4 1651 }
1da177e4
LT		 1652 *stpp = stp;
1653 return 0;
1654}
1655
1656static inline int
1657nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1658 struct nfsd4_open *open)
1659{
1660 struct iattr iattr = {
1661 .ia_valid = ATTR_SIZE,
1662 .ia_size = 0,
1663 };
1664 if (!open->op_truncate)
1665 return 0;
1666 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1667 return -EINVAL;
1668 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1669}
1670
1671static int
1672nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1673{
1674 struct file *filp = stp->st_vfs_file;
1675 struct inode *inode = filp->f_dentry->d_inode;
1676 unsigned int share_access;
1677 int status;
1678
1679 set_access(&share_access, stp->st_access_bmap);
1680 share_access = ~share_access;
1681 share_access &= open->op_share_access;
1682
1683 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1684 return nfsd4_truncate(rqstp, cur_fh, open);
1685
1686 status = get_write_access(inode);
1687 if (status)
1688 return nfserrno(status);
1689 status = nfsd4_truncate(rqstp, cur_fh, open);
1690 if (status) {
1691 put_write_access(inode);
1692 return status;
1693 }
1694 /* remember the open */
1695 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1696 set_bit(open->op_share_access, &stp->st_access_bmap);
1697 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1698
1699 return nfs_ok;
1700}
1701
1702
1703/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1704static void
1705nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1706{
1707 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1708 if (*status)
1709 *status = nfserr_reclaim_bad;
1710 else {
1711 open->op_stateowner->so_confirmed = 1;
1712 open->op_stateowner->so_seqid--;
1713 }
1714 }
1715}
1716
1717/*
1718 * Attempt to hand out a delegation.
1719 */
1720static void
1721nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1722{
1723 struct nfs4_delegation *dp;
1724 struct nfs4_stateowner *sop = stp->st_stateowner;
1725 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1726 struct file_lock fl, *flp = &fl;
1727 int status, flag = 0;
1728
1729 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1730 open->op_recall = 0;
1731 switch (open->op_claim_type) {
1732 case NFS4_OPEN_CLAIM_PREVIOUS:
1733 if (!atomic_read(&cb->cb_set))
1734 open->op_recall = 1;
1735 flag = open->op_delegate_type;
1736 if (flag == NFS4_OPEN_DELEGATE_NONE)
1737 goto out;
1738 break;
1739 case NFS4_OPEN_CLAIM_NULL:
1740 /* Let's not give out any delegations till everyone's
1741 * had the chance to reclaim theirs.... */
1742 if (nfs4_in_grace())
1743 goto out;
1744 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1745 goto out;
1746 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1747 flag = NFS4_OPEN_DELEGATE_WRITE;
1748 else
1749 flag = NFS4_OPEN_DELEGATE_READ;
1750 break;
1751 default:
1752 goto out;
1753 }
1da177e4
LT		 1754
1755 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1756 if (dp == NULL) {
1757 flag = NFS4_OPEN_DELEGATE_NONE;
1758 goto out;
1759 }
1760 locks_init_lock(&fl);
1761 fl.fl_lmops = &nfsd_lease_mng_ops;
1762 fl.fl_flags = FL_LEASE;
1763 fl.fl_end = OFFSET_MAX;
1764 fl.fl_owner = (fl_owner_t)dp;
1765 fl.fl_file = stp->st_vfs_file;
1766 fl.fl_pid = current->tgid;
1767
1768 /* setlease checks to see if delegation should be handed out.
1769 * the lock_manager callbacks fl_mylease and fl_change are used
1770 */
1771 if ((status = setlease(stp->st_vfs_file,
1772 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1773 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1774 unhash_delegation(dp);
1da177e4
LT		 1775 flag = NFS4_OPEN_DELEGATE_NONE;
1776 goto out;
1777 }
1778
1779 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1780
1781 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1782 dp->dl_stateid.si_boot,
1783 dp->dl_stateid.si_stateownerid,
1784 dp->dl_stateid.si_fileid,
1785 dp->dl_stateid.si_generation);
1786out:
7b190fec
N		 1787 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1788 && flag == NFS4_OPEN_DELEGATE_NONE
1789 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1790 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1791 open->op_delegate_type = flag;
1792}
1793
1794/*
1795 * called with nfs4_lock_state() held.
1796 */
1797int
1798nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1799{
1800 struct nfs4_file *fp = NULL;
1801 struct inode *ino = current_fh->fh_dentry->d_inode;
1802 struct nfs4_stateid *stp = NULL;
567d9829 1803 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1804 int status;
1805
1806 status = nfserr_inval;
1807 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1808 goto out;
1809 /*
1810 * Lookup file; if found, lookup stateid and check open request,
1811 * and check for delegations in the process of being recalled.
1812 * If not found, create the nfs4_file struct
1813 */
1814 fp = find_file(ino);
1815 if (fp) {
1816 if ((status = nfs4_check_open(fp, open, &stp)))
1817 goto out;
c44c5eeb
N		 1818 status = nfs4_check_deleg(fp, open, &dp);
1819 if (status)
1820 goto out;
1da177e4 1821 } else {
c44c5eeb
N		 1822 status = nfserr_bad_stateid;
1823 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1824 goto out;
1da177e4
LT		 1825 status = nfserr_resource;
1826 fp = alloc_init_file(ino);
1827 if (fp == NULL)
1828 goto out;
1829 }
1830
1831 /*
1832 * OPEN the file, or upgrade an existing OPEN.
1833 * If truncate fails, the OPEN fails.
1834 */
1835 if (stp) {
1836 /* Stateid was found, this is an OPEN upgrade */
1837 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1838 if (status)
1839 goto out;
1840 } else {
1841 /* Stateid was not found, this is a new OPEN */
1842 int flags = 0;
1843 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1844 flags = MAY_WRITE;
1845 else
1846 flags = MAY_READ;
567d9829
N		 1847 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1848 if (status)
1da177e4
LT		 1849 goto out;
1850 init_stateid(stp, fp, open);
1851 status = nfsd4_truncate(rqstp, current_fh, open);
1852 if (status) {
1853 release_stateid(stp, OPEN_STATE);
1854 goto out;
1855 }
1856 }
1857 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1858
1859 /*
1860 * Attempt to hand out a delegation. No error return, because the
1861 * OPEN succeeds even if we fail.
1862 */
1863 nfs4_open_delegation(current_fh, open, stp);
1864
1865 status = nfs_ok;
1866
1867 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1868 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1869 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1870out:
13cd2184
N		 1871 if (fp)
1872 put_nfs4_file(fp);
1da177e4
LT		 1873 /* CLAIM_PREVIOUS has different error returns */
1874 nfs4_set_claim_prev(open, &status);
1875 /*
1876 * To finish the open response, we just need to set the rflags.
1877 */
1878 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1879 if (!open->op_stateowner->so_confirmed)
1880 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1881
1882 return status;
1883}
1884
58da282b 1885static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1886static struct work_struct laundromat_work;
1887static void laundromat_main(void *);
1888static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1889
1890int
1891nfsd4_renew(clientid_t *clid)
1892{
1893 struct nfs4_client *clp;
1894 int status;
1895
1896 nfs4_lock_state();
1897 dprintk("process_renew(%08x/%08x): starting\n",
1898 clid->cl_boot, clid->cl_id);
1899 status = nfserr_stale_clientid;
1900 if (STALE_CLIENTID(clid))
1901 goto out;
1902 clp = find_confirmed_client(clid);
1903 status = nfserr_expired;
1904 if (clp == NULL) {
1905 /* We assume the client took too long to RENEW. */
1906 dprintk("nfsd4_renew: clientid not found!\n");
1907 goto out;
1908 }
1909 renew_client(clp);
1910 status = nfserr_cb_path_down;
1911 if (!list_empty(&clp->cl_del_perclnt)
1912 && !atomic_read(&clp->cl_callback.cb_set))
1913 goto out;
1914 status = nfs_ok;
1915out:
1916 nfs4_unlock_state();
1917 return status;
1918}
1919
a76b4319
N		 1920static void
1921end_grace(void)
1922{
1923 dprintk("NFSD: end of grace period\n");
1924 in_grace = 0;
1925}
1926
fd39ca9a 1927static time_t
1da177e4
LT		 1928nfs4_laundromat(void)
1929{
1930 struct nfs4_client *clp;
1931 struct nfs4_stateowner *sop;
1932 struct nfs4_delegation *dp;
1933 struct list_head *pos, *next, reaplist;
1934 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1935 time_t t, clientid_val = NFSD_LEASE_TIME;
1936 time_t u, test_val = NFSD_LEASE_TIME;
1937
1938 nfs4_lock_state();
1939
1940 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1941 if (in_grace)
1942 end_grace();
1da177e4
LT		 1943 list_for_each_safe(pos, next, &client_lru) {
1944 clp = list_entry(pos, struct nfs4_client, cl_lru);
1945 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1946 t = clp->cl_time - cutoff;
1947 if (clientid_val > t)
1948 clientid_val = t;
1949 break;
1950 }
1951 dprintk("NFSD: purging unused client (clientid %08x)\n",
1952 clp->cl_clientid.cl_id);
1953 expire_client(clp);
1954 }
1955 INIT_LIST_HEAD(&reaplist);
1956 spin_lock(&recall_lock);
1957 list_for_each_safe(pos, next, &del_recall_lru) {
1958 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1959 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1960 u = dp->dl_time - cutoff;
1961 if (test_val > u)
1962 test_val = u;
1963 break;
1964 }
1965 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1966 dp, dp->dl_flock);
1967 list_move(&dp->dl_recall_lru, &reaplist);
1968 }
1969 spin_unlock(&recall_lock);
1970 list_for_each_safe(pos, next, &reaplist) {
1971 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1972 list_del_init(&dp->dl_recall_lru);
1973 unhash_delegation(dp);
1974 }
1975 test_val = NFSD_LEASE_TIME;
1976 list_for_each_safe(pos, next, &close_lru) {
1977 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1978 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1979 u = sop->so_time - cutoff;
1980 if (test_val > u)
1981 test_val = u;
1982 break;
1983 }
1984 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1985 sop->so_id);
1986 list_del(&sop->so_close_lru);
1987 nfs4_put_stateowner(sop);
1988 }
1989 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1990 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1991 nfs4_unlock_state();
1992 return clientid_val;
1993}
1994
1995void
1996laundromat_main(void *not_used)
1997{
1998 time_t t;
1999
2000 t = nfs4_laundromat();
2001 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2002 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2003}
2004
2005/* search ownerid_hashtbl[] and close_lru for stateid owner
2006 * (stateid->si_stateownerid)
2007 */
fd39ca9a 2008static struct nfs4_stateowner *
1da177e4
LT		 2009find_openstateowner_id(u32 st_id, int flags) {
2010 struct nfs4_stateowner *local = NULL;
2011
2012 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2013 if (flags & CLOSE_STATE) {
2014 list_for_each_entry(local, &close_lru, so_close_lru) {
2015 if (local->so_id == st_id)
2016 return local;
2017 }
2018 }
2019 return NULL;
2020}
2021
2022static inline int
2023nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2024{
2025 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2026}
2027
2028static int
2029STALE_STATEID(stateid_t *stateid)
2030{
2031 if (stateid->si_boot == boot_time)
2032 return 0;
2033 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2034 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2035 stateid->si_generation);
2036 return 1;
2037}
2038
2039static inline int
2040access_permit_read(unsigned long access_bmap)
2041{
2042 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2043 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2044 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2045}
2046
2047static inline int
2048access_permit_write(unsigned long access_bmap)
2049{
2050 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2051 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2052}
2053
2054static
2055int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2056{
2057 int status = nfserr_openmode;
2058
2059 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2060 goto out;
2061 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2062 goto out;
2063 status = nfs_ok;
2064out:
2065 return status;
2066}
2067
1da177e4
LT		 2068static inline int
2069check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2070{
2071 /* Trying to call delegreturn with a special stateid? Yuch: */
2072 if (!(flags & (RD_STATE | WR_STATE)))
2073 return nfserr_bad_stateid;
2074 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2075 return nfs_ok;
2076 else if (nfs4_in_grace()) {
2077 /* Answer in remaining cases depends on existance of
2078 * conflicting state; so we must wait out the grace period. */
2079 return nfserr_grace;
2080 } else if (flags & WR_STATE)
2081 return nfs4_share_conflict(current_fh,
2082 NFS4_SHARE_DENY_WRITE);
2083 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2084 return nfs4_share_conflict(current_fh,
2085 NFS4_SHARE_DENY_READ);
2086}
2087
2088/*
2089 * Allow READ/WRITE during grace period on recovered state only for files
2090 * that are not able to provide mandatory locking.
2091 */
2092static inline int
2093io_during_grace_disallowed(struct inode *inode, int flags)
2094{
2095 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2096 && MANDATORY_LOCK(inode);
2097}
2098
2099/*
2100* Checks for stateid operations
2101*/
2102int
2103nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2104{
2105 struct nfs4_stateid *stp = NULL;
2106 struct nfs4_delegation *dp = NULL;
2107 stateid_t *stidp;
2108 struct inode *ino = current_fh->fh_dentry->d_inode;
2109 int status;
2110
2111 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2112 stateid->si_boot, stateid->si_stateownerid,
2113 stateid->si_fileid, stateid->si_generation);
2114 if (filpp)
2115 *filpp = NULL;
2116
2117 if (io_during_grace_disallowed(ino, flags))
2118 return nfserr_grace;
2119
2120 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2121 return check_special_stateids(current_fh, stateid, flags);
2122
2123 /* STALE STATEID */
2124 status = nfserr_stale_stateid;
2125 if (STALE_STATEID(stateid))
2126 goto out;
2127
2128 /* BAD STATEID */
2129 status = nfserr_bad_stateid;
2130 if (!stateid->si_fileid) { /* delegation stateid */
2131 if(!(dp = find_delegation_stateid(ino, stateid))) {
2132 dprintk("NFSD: delegation stateid not found\n");
2133 if (nfs4_in_grace())
2134 status = nfserr_grace;
2135 goto out;
2136 }
2137 stidp = &dp->dl_stateid;
2138 } else { /* open or lock stateid */
2139 if (!(stp = find_stateid(stateid, flags))) {
2140 dprintk("NFSD: open or lock stateid not found\n");
2141 if (nfs4_in_grace())
2142 status = nfserr_grace;
2143 goto out;
2144 }
2145 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2146 goto out;
2147 if (!stp->st_stateowner->so_confirmed)
2148 goto out;
2149 stidp = &stp->st_stateid;
2150 }
2151 if (stateid->si_generation > stidp->si_generation)
2152 goto out;
2153
2154 /* OLD STATEID */
2155 status = nfserr_old_stateid;
2156 if (stateid->si_generation < stidp->si_generation)
2157 goto out;
2158 if (stp) {
2159 if ((status = nfs4_check_openmode(stp,flags)))
2160 goto out;
2161 renew_client(stp->st_stateowner->so_client);
2162 if (filpp)
2163 *filpp = stp->st_vfs_file;
2164 } else if (dp) {
2165 if ((status = nfs4_check_delegmode(dp, flags)))
2166 goto out;
2167 renew_client(dp->dl_client);
2168 if (flags & DELEG_RET)
2169 unhash_delegation(dp);
2170 if (filpp)
2171 *filpp = dp->dl_vfs_file;
2172 }
2173 status = nfs_ok;
2174out:
2175 return status;
2176}
2177
2178
2179/*
2180 * Checks for sequence id mutating operations.
2181 */
fd39ca9a 2182static int
1da177e4
LT		 2183nfs4_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)
2184{
2185 int status;
2186 struct nfs4_stateid *stp;
2187 struct nfs4_stateowner *sop;
2188
2189 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2190 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2191 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2192 stateid->si_generation);
2193
2194 *stpp = NULL;
2195 *sopp = NULL;
2196
2197 status = nfserr_bad_stateid;
2198 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2199 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2200 goto out;
2201 }
2202
2203 status = nfserr_stale_stateid;
2204 if (STALE_STATEID(stateid))
2205 goto out;
2206 /*
2207 * We return BAD_STATEID if filehandle doesn't match stateid,
2208 * the confirmed flag is incorrecly set, or the generation
2209 * number is incorrect.
2210 * If there is no entry in the openfile table for this id,
2211 * we can't always return BAD_STATEID;
2212 * this might be a retransmitted CLOSE which has arrived after
2213 * the openfile has been released.
2214 */
2215 if (!(stp = find_stateid(stateid, flags)))
2216 goto no_nfs4_stateid;
2217
2218 status = nfserr_bad_stateid;
2219
2220 /* for new lock stateowners:
2221 * check that the lock->v.new.open_stateid
2222 * refers to an open stateowner
2223 *
2224 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2225 * as the open_stateid->st_stateowner->so_client->clientid
2226 */
2227 if (lockclid) {
2228 struct nfs4_stateowner *sop = stp->st_stateowner;
2229 struct nfs4_client *clp = sop->so_client;
2230
2231 if (!sop->so_is_open_owner)
2232 goto out;
2233 if (!cmp_clid(&clp->cl_clientid, lockclid))
2234 goto out;
2235 }
2236
2237 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2238 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2239 goto out;
2240 }
2241
2242 *stpp = stp;
2243 *sopp = sop = stp->st_stateowner;
2244
2245 /*
2246 * We now validate the seqid and stateid generation numbers.
2247 * For the moment, we ignore the possibility of
2248 * generation number wraparound.
2249 */
2250 if (seqid != sop->so_seqid + 1)
2251 goto check_replay;
2252
2253 if (sop->so_confirmed) {
2254 if (flags & CONFIRM) {
2255 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2256 goto out;
2257 }
2258 }
2259 else {
2260 if (!(flags & CONFIRM)) {
2261 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2262 goto out;
2263 }
2264 }
2265 if (stateid->si_generation > stp->st_stateid.si_generation) {
2266 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2267 goto out;
2268 }
2269
2270 status = nfserr_old_stateid;
2271 if (stateid->si_generation < stp->st_stateid.si_generation) {
2272 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2273 goto out;
2274 }
2275 /* XXX renew the client lease here */
2276 status = nfs_ok;
2277
2278out:
2279 return status;
2280
2281no_nfs4_stateid:
2282
2283 /*
2284 * We determine whether this is a bad stateid or a replay,
2285 * starting by trying to look up the stateowner.
2286 * If stateowner is not found - stateid is bad.
2287 */
2288 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2289 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2290 status = nfserr_bad_stateid;
2291 goto out;
2292 }
2293 *sopp = sop;
2294
2295check_replay:
2296 if (seqid == sop->so_seqid) {
2297 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2298 /* indicate replay to calling function */
2299 status = NFSERR_REPLAY_ME;
2300 } else {
2301 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2302
2303 *sopp = NULL;
2304 status = nfserr_bad_seqid;
2305 }
2306 goto out;
2307}
2308
2309int
2310nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2311{
2312 int status;
2313 struct nfs4_stateowner *sop;
2314 struct nfs4_stateid *stp;
2315
2316 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2317 (int)current_fh->fh_dentry->d_name.len,
2318 current_fh->fh_dentry->d_name.name);
2319
2320 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2321 goto out;
2322
2323 nfs4_lock_state();
2324
2325 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2326 &oc->oc_req_stateid,
2327 CHECK_FH | CONFIRM | OPEN_STATE,
2328 &oc->oc_stateowner, &stp, NULL)))
2329 goto out;
2330
2331 sop = oc->oc_stateowner;
2332 sop->so_confirmed = 1;
2333 update_stateid(&stp->st_stateid);
2334 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2335 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2336 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2337 stp->st_stateid.si_boot,
2338 stp->st_stateid.si_stateownerid,
2339 stp->st_stateid.si_fileid,
2340 stp->st_stateid.si_generation);
2341out:
2342 if (oc->oc_stateowner)
2343 nfs4_get_stateowner(oc->oc_stateowner);
2344 nfs4_unlock_state();
2345 return status;
2346}
2347
2348
2349/*
2350 * unset all bits in union bitmap (bmap) that
2351 * do not exist in share (from successful OPEN_DOWNGRADE)
2352 */
2353static void
2354reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2355{
2356 int i;
2357 for (i = 1; i < 4; i++) {
2358 if ((i & access) != i)
2359 __clear_bit(i, bmap);
2360 }
2361}
2362
2363static void
2364reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2365{
2366 int i;
2367 for (i = 0; i < 4; i++) {
2368 if ((i & deny) != i)
2369 __clear_bit(i, bmap);
2370 }
2371}
2372
2373int
2374nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2375{
2376 int status;
2377 struct nfs4_stateid *stp;
2378 unsigned int share_access;
2379
2380 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2381 (int)current_fh->fh_dentry->d_name.len,
2382 current_fh->fh_dentry->d_name.name);
2383
2384 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2385 return nfserr_inval;
2386
2387 nfs4_lock_state();
2388 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2389 &od->od_stateid,
2390 CHECK_FH | OPEN_STATE,
2391 &od->od_stateowner, &stp, NULL)))
2392 goto out;
2393
2394 status = nfserr_inval;
2395 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2396 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2397 stp->st_access_bmap, od->od_share_access);
2398 goto out;
2399 }
2400 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2401 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2402 stp->st_deny_bmap, od->od_share_deny);
2403 goto out;
2404 }
2405 set_access(&share_access, stp->st_access_bmap);
2406 nfs4_file_downgrade(stp->st_vfs_file,
2407 share_access & ~od->od_share_access);
2408
2409 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2410 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2411
2412 update_stateid(&stp->st_stateid);
2413 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2414 status = nfs_ok;
2415out:
2416 if (od->od_stateowner)
2417 nfs4_get_stateowner(od->od_stateowner);
2418 nfs4_unlock_state();
2419 return status;
2420}
2421
2422/*
2423 * nfs4_unlock_state() called after encode
2424 */
2425int
2426nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2427{
2428 int status;
2429 struct nfs4_stateid *stp;
2430
2431 dprintk("NFSD: nfsd4_close on file %.*s\n",
2432 (int)current_fh->fh_dentry->d_name.len,
2433 current_fh->fh_dentry->d_name.name);
2434
2435 nfs4_lock_state();
2436 /* check close_lru for replay */
2437 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2438 &close->cl_stateid,
2439 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2440 &close->cl_stateowner, &stp, NULL)))
2441 goto out;
2442 /*
2443 * Return success, but first update the stateid.
2444 */
2445 status = nfs_ok;
2446 update_stateid(&stp->st_stateid);
2447 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2448
2449 /* release_state_owner() calls nfsd_close() if needed */
2450 release_state_owner(stp, OPEN_STATE);
2451out:
2452 if (close->cl_stateowner)
2453 nfs4_get_stateowner(close->cl_stateowner);
2454 nfs4_unlock_state();
2455 return status;
2456}
2457
2458int
2459nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2460{
2461 int status;
2462
2463 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2464 goto out;
2465
2466 nfs4_lock_state();
2467 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2468 nfs4_unlock_state();
2469out:
2470 return status;
2471}
2472
2473
2474/*
2475 * Lock owner state (byte-range locks)
2476 */
2477#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2478#define LOCK_HASH_BITS 8
2479#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2480#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2481
2482#define lockownerid_hashval(id) \
2483 ((id) & LOCK_HASH_MASK)
2484
2485static inline unsigned int
2486lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2487 struct xdr_netobj *ownername)
2488{
2489 return (file_hashval(inode) + cl_id
2490 + opaque_hashval(ownername->data, ownername->len))
2491 & LOCK_HASH_MASK;
2492}
2493
2494static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2495static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2496static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2497
fd39ca9a 2498static struct nfs4_stateid *
1da177e4
LT		 2499find_stateid(stateid_t *stid, int flags)
2500{
2501 struct nfs4_stateid *local = NULL;
2502 u32 st_id = stid->si_stateownerid;
2503 u32 f_id = stid->si_fileid;
2504 unsigned int hashval;
2505
2506 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2507 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2508 hashval = stateid_hashval(st_id, f_id);
2509 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2510 if ((local->st_stateid.si_stateownerid == st_id) &&
2511 (local->st_stateid.si_fileid == f_id))
2512 return local;
2513 }
2514 }
2515 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2516 hashval = stateid_hashval(st_id, f_id);
2517 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2518 if ((local->st_stateid.si_stateownerid == st_id) &&
2519 (local->st_stateid.si_fileid == f_id))
2520 return local;
2521 }
2522 } else
2523 printk("NFSD: find_stateid: ERROR: no state flag\n");
2524 return NULL;
2525}
2526
2527static struct nfs4_delegation *
2528find_delegation_stateid(struct inode *ino, stateid_t *stid)
2529{
13cd2184
N		 2530 struct nfs4_file *fp;
2531 struct nfs4_delegation *dl;
1da177e4
LT		 2532
2533 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2534 stid->si_boot, stid->si_stateownerid,
2535 stid->si_fileid, stid->si_generation);
2536
1da177e4 2537 fp = find_file(ino);
13cd2184
N		 2538 if (!fp)
2539 return NULL;
2540 dl = find_delegation_file(fp, stid);
2541 put_nfs4_file(fp);
2542 return dl;
1da177e4
LT		 2543}
2544
2545/*
2546 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2547 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2548 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2549 * locking, this prevents us from being completely protocol-compliant. The
2550 * real solution to this problem is to start using unsigned file offsets in
2551 * the VFS, but this is a very deep change!
2552 */
2553static inline void
2554nfs4_transform_lock_offset(struct file_lock *lock)
2555{
2556 if (lock->fl_start < 0)
2557 lock->fl_start = OFFSET_MAX;
2558 if (lock->fl_end < 0)
2559 lock->fl_end = OFFSET_MAX;
2560}
2561
fd39ca9a 2562static int
1da177e4
LT		 2563nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2564{
2565 struct nfs4_stateowner *local = NULL;
2566 int status = 0;
2567
2568 if (hashval >= LOCK_HASH_SIZE)
2569 goto out;
2570 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2571 if (local == sop) {
2572 status = 1;
2573 goto out;
2574 }
2575 }
2576out:
2577 return status;
2578}
2579
2580
2581static inline void
2582nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2583{
2584 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2585 unsigned int hval = lockownerid_hashval(sop->so_id);
2586
2587 deny->ld_sop = NULL;
2588 if (nfs4_verify_lock_stateowner(sop, hval)) {
2589 kref_get(&sop->so_ref);
2590 deny->ld_sop = sop;
2591 deny->ld_clientid = sop->so_client->cl_clientid;
2592 }
2593 deny->ld_start = fl->fl_start;
2594 deny->ld_length = ~(u64)0;
2595 if (fl->fl_end != ~(u64)0)
2596 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2597 deny->ld_type = NFS4_READ_LT;
2598 if (fl->fl_type != F_RDLCK)
2599 deny->ld_type = NFS4_WRITE_LT;
2600}
2601
2602static struct nfs4_stateowner *
2603find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2604{
2605 struct nfs4_stateowner *local = NULL;
2606 int i;
2607
2608 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2609 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2610 if (!cmp_owner_str(local, owner, clid))
2611 continue;
2612 return local;
2613 }
2614 }
2615 return NULL;
2616}
2617
2618static struct nfs4_stateowner *
2619find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2620 struct xdr_netobj *owner)
2621{
2622 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2623 struct nfs4_stateowner *op;
2624
2625 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2626 if (cmp_owner_str(op, owner, clid))
2627 return op;
2628 }
2629 return NULL;
2630}
2631
2632/*
2633 * Alloc a lock owner structure.
2634 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2635 * occured.
2636 *
2637 * strhashval = lock_ownerstr_hashval
2638 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2639 */
2640
2641static struct nfs4_stateowner *
2642alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2643 struct nfs4_stateowner *sop;
2644 struct nfs4_replay *rp;
2645 unsigned int idhashval;
2646
2647 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2648 return NULL;
2649 idhashval = lockownerid_hashval(current_ownerid);
2650 INIT_LIST_HEAD(&sop->so_idhash);
2651 INIT_LIST_HEAD(&sop->so_strhash);
2652 INIT_LIST_HEAD(&sop->so_perclient);
2653 INIT_LIST_HEAD(&sop->so_perfilestate);
2654 INIT_LIST_HEAD(&sop->so_perlockowner);
2655 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2656 sop->so_time = 0;
2657 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2658 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2659 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2660 sop->so_is_open_owner = 0;
2661 sop->so_id = current_ownerid++;
2662 sop->so_client = clp;
2663 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2664 sop->so_confirmed = 1;
2665 rp = &sop->so_replay;
2666 rp->rp_status = NFSERR_SERVERFAULT;
2667 rp->rp_buflen = 0;
2668 rp->rp_buf = rp->rp_ibuf;
2669 return sop;
2670}
2671
fd39ca9a 2672static struct nfs4_stateid *
1da177e4
LT		 2673alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2674{
2675 struct nfs4_stateid *stp;
2676 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2677
5ac049ac
N		 2678 stp = nfs4_alloc_stateid();
2679 if (stp == NULL)
1da177e4
LT		 2680 goto out;
2681 INIT_LIST_HEAD(&stp->st_hash);
2682 INIT_LIST_HEAD(&stp->st_perfile);
2683 INIT_LIST_HEAD(&stp->st_perfilestate);
2684 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2685 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2686 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4
LT		 2687 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2688 stp->st_stateowner = sop;
13cd2184 2689 get_nfs4_file(fp);
1da177e4
LT		 2690 stp->st_file = fp;
2691 stp->st_stateid.si_boot = boot_time;
2692 stp->st_stateid.si_stateownerid = sop->so_id;
2693 stp->st_stateid.si_fileid = fp->fi_id;
2694 stp->st_stateid.si_generation = 0;
2695 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2696 stp->st_access_bmap = open_stp->st_access_bmap;
2697 stp->st_deny_bmap = open_stp->st_deny_bmap;
2698
2699out:
2700 return stp;
2701}
2702
fd39ca9a 2703static int
1da177e4
LT		 2704check_lock_length(u64 offset, u64 length)
2705{
2706 return ((length == 0) || ((length != ~(u64)0) &&
2707 LOFF_OVERFLOW(offset, length)));
2708}
2709
2710/*
2711 * LOCK operation
2712 */
2713int
2714nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2715{
2716 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2717 struct nfs4_stateid *lock_stp;
2718 struct file *filp;
2719 struct file_lock file_lock;
2720 struct file_lock *conflock;
2721 int status = 0;
2722 unsigned int strhashval;
2723
2724 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2725 (long long) lock->lk_offset,
2726 (long long) lock->lk_length);
2727
2728 if (nfs4_in_grace() && !lock->lk_reclaim)
2729 return nfserr_grace;
2730 if (!nfs4_in_grace() && lock->lk_reclaim)
2731 return nfserr_no_grace;
2732
2733 if (check_lock_length(lock->lk_offset, lock->lk_length))
2734 return nfserr_inval;
2735
2736 nfs4_lock_state();
2737
2738 if (lock->lk_is_new) {
2739 /*
2740 * Client indicates that this is a new lockowner.
2741 * Use open owner and open stateid to create lock owner and lock
2742 * stateid.
2743 */
2744 struct nfs4_stateid *open_stp = NULL;
2745 struct nfs4_file *fp;
2746
2747 status = nfserr_stale_clientid;
2748 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2749 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2750 goto out;
2751 }
2752
2753 /* is the new lock seqid presented by the client zero? */
2754 status = nfserr_bad_seqid;
2755 if (lock->v.new.lock_seqid != 0)
2756 goto out;
2757
2758 /* validate and update open stateid and open seqid */
2759 status = nfs4_preprocess_seqid_op(current_fh,
2760 lock->lk_new_open_seqid,
2761 &lock->lk_new_open_stateid,
2762 CHECK_FH | OPEN_STATE,
2763 &open_sop, &open_stp,
2764 &lock->v.new.clientid);
2765 if (status) {
2766 if (lock->lk_reclaim)
2767 status = nfserr_reclaim_bad;
2768 goto out;
2769 }
2770 /* create lockowner and lock stateid */
2771 fp = open_stp->st_file;
2772 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2773 open_sop->so_client->cl_clientid.cl_id,
2774 &lock->v.new.owner);
2775 /*
2776 * If we already have this lock owner, the client is in
2777 * error (or our bookeeping is wrong!)
2778 * for asking for a 'new lock'.
2779 */
2780 status = nfserr_bad_stateid;
2781 lock_sop = find_lockstateowner(&lock->v.new.owner,
2782 &lock->v.new.clientid);
2783 if (lock_sop)
2784 goto out;
2785 status = nfserr_resource;
2786 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2787 goto out;
2788 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2789 fp, open_stp)) == NULL) {
2790 release_stateowner(lock->lk_stateowner);
2791 lock->lk_stateowner = NULL;
2792 goto out;
2793 }
2794 /* bump the open seqid used to create the lock */
2795 open_sop->so_seqid++;
2796 } else {
2797 /* lock (lock owner + lock stateid) already exists */
2798 status = nfs4_preprocess_seqid_op(current_fh,
2799 lock->lk_old_lock_seqid,
2800 &lock->lk_old_lock_stateid,
2801 CHECK_FH | LOCK_STATE,
2802 &lock->lk_stateowner, &lock_stp, NULL);
2803 if (status)
2804 goto out;
2805 }
2806 /* lock->lk_stateowner and lock_stp have been created or found */
2807 filp = lock_stp->st_vfs_file;
2808
2809 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2810 printk("NFSD: nfsd4_lock: permission denied!\n");
2811 goto out;
2812 }
2813
2814 locks_init_lock(&file_lock);
2815 switch (lock->lk_type) {
2816 case NFS4_READ_LT:
2817 case NFS4_READW_LT:
2818 file_lock.fl_type = F_RDLCK;
2819 break;
2820 case NFS4_WRITE_LT:
2821 case NFS4_WRITEW_LT:
2822 file_lock.fl_type = F_WRLCK;
2823 break;
2824 default:
2825 status = nfserr_inval;
2826 goto out;
2827 }
2828 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2829 file_lock.fl_pid = current->tgid;
2830 file_lock.fl_file = filp;
2831 file_lock.fl_flags = FL_POSIX;
2832
2833 file_lock.fl_start = lock->lk_offset;
2834 if ((lock->lk_length == ~(u64)0) ||
2835 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2836 file_lock.fl_end = ~(u64)0;
2837 else
2838 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2839 nfs4_transform_lock_offset(&file_lock);
2840
2841 /*
2842 * Try to lock the file in the VFS.
2843 * Note: locks.c uses the BKL to protect the inode's lock list.
2844 */
2845
2846 status = posix_lock_file(filp, &file_lock);
2847 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2848 file_lock.fl_ops->fl_release_private(&file_lock);
2849 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2850 switch (-status) {
2851 case 0: /* success! */
2852 update_stateid(&lock_stp->st_stateid);
2853 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2854 sizeof(stateid_t));
2855 goto out;
2856 case (EAGAIN):
2857 goto conflicting_lock;
2858 case (EDEADLK):
2859 status = nfserr_deadlock;
2860 default:
2861 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2862 goto out_destroy_new_stateid;
2863 }
2864
2865conflicting_lock:
2866 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2867 status = nfserr_denied;
2868 /* XXX There is a race here. Future patch needed to provide
2869 * an atomic posix_lock_and_test_file
2870 */
2871 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2872 status = nfserr_serverfault;
2873 goto out;
2874 }
2875 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2876
2877out_destroy_new_stateid:
2878 if (lock->lk_is_new) {
2879 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2880 /*
2881 * An error encountered after instantiation of the new
2882 * stateid has forced us to destroy it.
2883 */
2884 if (!seqid_mutating_err(status))
2885 open_sop->so_seqid--;
2886
2887 release_state_owner(lock_stp, LOCK_STATE);
2888 }
2889out:
2890 if (lock->lk_stateowner)
2891 nfs4_get_stateowner(lock->lk_stateowner);
2892 nfs4_unlock_state();
2893 return status;
2894}
2895
2896/*
2897 * LOCKT operation
2898 */
2899int
2900nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2901{
2902 struct inode *inode;
2903 struct file file;
2904 struct file_lock file_lock;
2905 struct file_lock *conflicting_lock;
2906 int status;
2907
2908 if (nfs4_in_grace())
2909 return nfserr_grace;
2910
2911 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2912 return nfserr_inval;
2913
2914 lockt->lt_stateowner = NULL;
2915 nfs4_lock_state();
2916
2917 status = nfserr_stale_clientid;
2918 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2919 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2920 goto out;
2921 }
2922
2923 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2924 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2925 if (status == nfserr_symlink)
2926 status = nfserr_inval;
2927 goto out;
2928 }
2929
2930 inode = current_fh->fh_dentry->d_inode;
2931 locks_init_lock(&file_lock);
2932 switch (lockt->lt_type) {
2933 case NFS4_READ_LT:
2934 case NFS4_READW_LT:
2935 file_lock.fl_type = F_RDLCK;
2936 break;
2937 case NFS4_WRITE_LT:
2938 case NFS4_WRITEW_LT:
2939 file_lock.fl_type = F_WRLCK;
2940 break;
2941 default:
2942 printk("NFSD: nfs4_lockt: bad lock type!\n");
2943 status = nfserr_inval;
2944 goto out;
2945 }
2946
2947 lockt->lt_stateowner = find_lockstateowner_str(inode,
2948 &lockt->lt_clientid, &lockt->lt_owner);
2949 if (lockt->lt_stateowner)
2950 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2951 file_lock.fl_pid = current->tgid;
2952 file_lock.fl_flags = FL_POSIX;
2953
2954 file_lock.fl_start = lockt->lt_offset;
2955 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2956 file_lock.fl_end = ~(u64)0;
2957 else
2958 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2959
2960 nfs4_transform_lock_offset(&file_lock);
2961
2962 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2963 * since LOCKT doesn't require an OPEN, and therefore a struct
2964 * file may not exist, pass posix_test_lock a struct file with
2965 * only the dentry:inode set.
2966 */
2967 memset(&file, 0, sizeof (struct file));
2968 file.f_dentry = current_fh->fh_dentry;
2969
2970 status = nfs_ok;
2971 conflicting_lock = posix_test_lock(&file, &file_lock);
2972 if (conflicting_lock) {
2973 status = nfserr_denied;
2974 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2975 }
2976out:
2977 nfs4_unlock_state();
2978 return status;
2979}
2980
2981int
2982nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2983{
2984 struct nfs4_stateid *stp;
2985 struct file *filp = NULL;
2986 struct file_lock file_lock;
2987 int status;
2988
2989 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2990 (long long) locku->lu_offset,
2991 (long long) locku->lu_length);
2992
2993 if (check_lock_length(locku->lu_offset, locku->lu_length))
2994 return nfserr_inval;
2995
2996 nfs4_lock_state();
2997
2998 if ((status = nfs4_preprocess_seqid_op(current_fh,
2999 locku->lu_seqid,
3000 &locku->lu_stateid,
3001 CHECK_FH | LOCK_STATE,
3002 &locku->lu_stateowner, &stp, NULL)))
3003 goto out;
3004
3005 filp = stp->st_vfs_file;
3006 BUG_ON(!filp);
3007 locks_init_lock(&file_lock);
3008 file_lock.fl_type = F_UNLCK;
3009 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3010 file_lock.fl_pid = current->tgid;
3011 file_lock.fl_file = filp;
3012 file_lock.fl_flags = FL_POSIX;
3013 file_lock.fl_start = locku->lu_offset;
3014
3015 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
3016 file_lock.fl_end = ~(u64)0;
3017 else
3018 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
3019 nfs4_transform_lock_offset(&file_lock);
3020
3021 /*
3022 * Try to unlock the file in the VFS.
3023 */
3024 status = posix_lock_file(filp, &file_lock);
3025 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3026 file_lock.fl_ops->fl_release_private(&file_lock);
3027 if (status) {
3028 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3029 goto out_nfserr;
3030 }
3031 /*
3032 * OK, unlock succeeded; the only thing left to do is update the stateid.
3033 */
3034 update_stateid(&stp->st_stateid);
3035 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3036
3037out:
3038 if (locku->lu_stateowner)
3039 nfs4_get_stateowner(locku->lu_stateowner);
3040 nfs4_unlock_state();
3041 return status;
3042
3043out_nfserr:
3044 status = nfserrno(status);
3045 goto out;
3046}
3047
3048/*
3049 * returns
3050 * 1: locks held by lockowner
3051 * 0: no locks held by lockowner
3052 */
3053static int
3054check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3055{
3056 struct file_lock **flpp;
3057 struct inode *inode = filp->f_dentry->d_inode;
3058 int status = 0;
3059
3060 lock_kernel();
3061 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3062 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3063 status = 1;
3064 goto out;
3065 }
3066out:
3067 unlock_kernel();
3068 return status;
3069}
3070
3071int
3072nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3073{
3074 clientid_t *clid = &rlockowner->rl_clientid;
3075 struct nfs4_stateowner *local = NULL;
3076 struct xdr_netobj *owner = &rlockowner->rl_owner;
3077 int status;
3078
3079 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3080 clid->cl_boot, clid->cl_id);
3081
3082 /* XXX check for lease expiration */
3083
3084 status = nfserr_stale_clientid;
3085 if (STALE_CLIENTID(clid)) {
3086 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3087 return status;
3088 }
3089
3090 nfs4_lock_state();
3091
3092 status = nfs_ok;
3093 local = find_lockstateowner(owner, clid);
3094 if (local) {
3095 struct nfs4_stateid *stp;
3096
3097 /* check for any locks held by any stateid
3098 * associated with the (lock) stateowner */
3099 status = nfserr_locks_held;
3100 list_for_each_entry(stp, &local->so_perfilestate,
3101 st_perfilestate) {
3102 if (check_for_locks(stp->st_vfs_file, local))
3103 goto out;
3104 }
3105 /* no locks held by (lock) stateowner */
3106 status = nfs_ok;
3107 release_stateowner(local);
3108 }
3109out:
3110 nfs4_unlock_state();
3111 return status;
3112}
3113
3114static inline struct nfs4_client_reclaim *
a55370a3 3115alloc_reclaim(void)
1da177e4 3116{
a55370a3 3117 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3118}
3119
3120/*
3121 * failure => all reset bets are off, nfserr_no_grace...
3122 */
3123static int
a55370a3 3124nfs4_client_to_reclaim(char *name)
1da177e4
LT		 3125{
3126 unsigned int strhashval;
3127 struct nfs4_client_reclaim *crp = NULL;
3128
a55370a3
N		 3129 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3130 crp = alloc_reclaim();
1da177e4
LT		 3131 if (!crp)
3132 return 0;
a55370a3 3133 strhashval = clientstr_hashval(name);
1da177e4
LT		 3134 INIT_LIST_HEAD(&crp->cr_strhash);
3135 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3136 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3137 reclaim_str_hashtbl_size++;
3138 return 1;
3139}
3140
3141static void
3142nfs4_release_reclaim(void)
3143{
3144 struct nfs4_client_reclaim *crp = NULL;
3145 int i;
3146
1da177e4
LT		 3147 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3148 while (!list_empty(&reclaim_str_hashtbl[i])) {
3149 crp = list_entry(reclaim_str_hashtbl[i].next,
3150 struct nfs4_client_reclaim, cr_strhash);
3151 list_del(&crp->cr_strhash);
1da177e4
LT		 3152 kfree(crp);
3153 reclaim_str_hashtbl_size--;
3154 }
3155 }
3156 BUG_ON(reclaim_str_hashtbl_size);
3157}
3158
3159/*
3160 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3161static struct nfs4_client_reclaim *
1da177e4
LT		 3162nfs4_find_reclaim_client(clientid_t *clid)
3163{
3164 unsigned int strhashval;
3165 struct nfs4_client *clp;
3166 struct nfs4_client_reclaim *crp = NULL;
3167
3168
3169 /* find clientid in conf_id_hashtbl */
3170 clp = find_confirmed_client(clid);
3171 if (clp == NULL)
3172 return NULL;
3173
a55370a3
N		 3174 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3175 clp->cl_name.len, clp->cl_name.data,
3176 clp->cl_recdir);
1da177e4
LT		 3177
3178 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3179 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3180 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3181 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3182 return crp;
3183 }
3184 }
3185 return NULL;
3186}
3187
3188/*
3189* Called from OPEN. Look for clientid in reclaim list.
3190*/
3191int
3192nfs4_check_open_reclaim(clientid_t *clid)
3193{
dfc83565 3194 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3195}
3196
ac4d8ff2 3197/* initialization to perform at module load time: */
1da177e4 3198
ac4d8ff2
N		 3199void
3200nfs4_state_init(void)
1da177e4
LT		 3201{
3202 int i;
1da177e4 3203
1da177e4
LT		 3204 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3205 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3206 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3207 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3208 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3209 }
3210 for (i = 0; i < FILE_HASH_SIZE; i++) {
3211 INIT_LIST_HEAD(&file_hashtbl[i]);
3212 }
3213 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3214 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3215 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3216 }
3217 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3218 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3219 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3220 }
3221 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3222 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3223 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3224 }
1da177e4 3225 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3226 INIT_LIST_HEAD(&close_lru);
3227 INIT_LIST_HEAD(&client_lru);
3228 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3229 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3230 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3231 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3232}
3233
3234/* initialization to perform when the nfsd service is started: */
3235
3236static void
3237__nfs4_state_start(void)
3238{
3239 time_t grace_time;
3240
1da177e4 3241 boot_time = get_seconds();
d99a05ad
N		 3242 grace_time = max(user_lease_time, lease_time);
3243 lease_time = user_lease_time;
a76b4319 3244 in_grace = 1;
d99a05ad 3245 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3246 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3247 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3248}
3249
3250int
76a3550e 3251nfs4_state_start(void)
1da177e4
LT		 3252{
3253 int status;
3254
3255 if (nfs4_init)
3256 return 0;
3257 status = nfsd4_init_slabs();
3258 if (status)
3259 return status;
76a3550e 3260 __nfs4_state_start();
1da177e4
LT		 3261 nfs4_init = 1;
3262 return 0;
3263}
3264
3265int
3266nfs4_in_grace(void)
3267{
a76b4319 3268 return in_grace;
1da177e4
LT		 3269}
3270
3271time_t
3272nfs4_lease_time(void)
3273{
3274 return lease_time;
3275}
3276
3277static void
3278__nfs4_state_shutdown(void)
3279{
3280 int i;
3281 struct nfs4_client *clp = NULL;
3282 struct nfs4_delegation *dp = NULL;
3283 struct nfs4_stateowner *sop = NULL;
3284 struct list_head *pos, *next, reaplist;
3285
3286 list_for_each_safe(pos, next, &close_lru) {
3287 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3288 list_del(&sop->so_close_lru);
3289 nfs4_put_stateowner(sop);
3290 }
3291
3292 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3293 while (!list_empty(&conf_id_hashtbl[i])) {
3294 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3295 expire_client(clp);
3296 }
3297 while (!list_empty(&unconf_str_hashtbl[i])) {
3298 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3299 expire_client(clp);
3300 }
3301 }
3302 INIT_LIST_HEAD(&reaplist);
3303 spin_lock(&recall_lock);
3304 list_for_each_safe(pos, next, &del_recall_lru) {
3305 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3306 list_move(&dp->dl_recall_lru, &reaplist);
3307 }
3308 spin_unlock(&recall_lock);
3309 list_for_each_safe(pos, next, &reaplist) {
3310 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3311 list_del_init(&dp->dl_recall_lru);
3312 unhash_delegation(dp);
3313 }
3314
1da177e4 3315 cancel_delayed_work(&laundromat_work);
58da282b
N		 3316 flush_workqueue(laundry_wq);
3317 destroy_workqueue(laundry_wq);
1da177e4 3318 nfs4_init = 0;
1da177e4
LT		 3319}
3320
3321void
3322nfs4_state_shutdown(void)
3323{
3324 nfs4_lock_state();
3325 nfs4_release_reclaim();
3326 __nfs4_state_shutdown();
3327 nfsd4_free_slabs();
3328 nfs4_unlock_state();
3329}
3330
3331/*
3332 * Called when leasetime is changed.
3333 *
d99a05ad
N		 3334 * The only way the protocol gives us to handle on-the-fly lease changes is to
3335 * simulate a reboot. Instead of doing that, we just wait till the next time
3336 * we start to register any changes in lease time. If the administrator
3337 * really wants to change the lease time *now*, they can go ahead and bring
3338 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3339 */
3340void
3341nfs4_reset_lease(time_t leasetime)
3342{
d99a05ad
N		 3343 lock_kernel();
3344 user_lease_time = leasetime;
3345 unlock_kernel();
1da177e4 3346}
Linux 6.x block layer and io_uring tree(s)