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[PATCH] nfsd4: don't reopen for delegated client
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
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1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Globals */
55static time_t lease_time = 90; /* default lease time */
56static time_t old_lease_time = 90; /* past incarnation lease time */
57static u32 nfs4_reclaim_init = 0;
58time_t boot_time;
59static time_t grace_end = 0;
60static u32 current_clientid = 1;
61static u32 current_ownerid = 1;
62static u32 current_fileid = 1;
63static u32 current_delegid = 1;
64static u32 nfs4_init;
65stateid_t zerostateid; /* bits all 0 */
66stateid_t onestateid; /* bits all 1 */
67
68/* debug counters */
69u32 list_add_perfile = 0;
70u32 list_del_perfile = 0;
71u32 add_perclient = 0;
72u32 del_perclient = 0;
73u32 alloc_file = 0;
74u32 free_file = 0;
75u32 vfsopen = 0;
76u32 vfsclose = 0;
77u32 alloc_delegation= 0;
78u32 free_delegation= 0;
79
80/* forward declarations */
81struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
82static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
83static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
84
85/* Locking:
86 *
87 * client_sema:
88 * protects clientid_hashtbl[], clientstr_hashtbl[],
89 * unconfstr_hashtbl[], uncofid_hashtbl[].
90 */
91static DECLARE_MUTEX(client_sema);
92
93void
94nfs4_lock_state(void)
95{
96 down(&client_sema);
97}
98
99void
100nfs4_unlock_state(void)
101{
102 up(&client_sema);
103}
104
105static inline u32
106opaque_hashval(const void *ptr, int nbytes)
107{
108 unsigned char *cptr = (unsigned char *) ptr;
109
110 u32 x = 0;
111 while (nbytes--) {
112 x *= 37;
113 x += *cptr++;
114 }
115 return x;
116}
117
118/* forward declarations */
119static void release_stateowner(struct nfs4_stateowner *sop);
120static void release_stateid(struct nfs4_stateid *stp, int flags);
121static void release_file(struct nfs4_file *fp);
122
123/*
124 * Delegation state
125 */
126
127/* recall_lock protects the del_recall_lru */
128spinlock_t recall_lock;
129static struct list_head del_recall_lru;
130
131static struct nfs4_delegation *
132alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
133{
134 struct nfs4_delegation *dp;
135 struct nfs4_file *fp = stp->st_file;
136 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
137
138 dprintk("NFSD alloc_init_deleg\n");
139 if ((dp = kmalloc(sizeof(struct nfs4_delegation),
140 GFP_KERNEL)) == NULL)
141 return dp;
142 INIT_LIST_HEAD(&dp->dl_del_perfile);
143 INIT_LIST_HEAD(&dp->dl_del_perclnt);
144 INIT_LIST_HEAD(&dp->dl_recall_lru);
145 dp->dl_client = clp;
146 dp->dl_file = fp;
147 dp->dl_flock = NULL;
148 get_file(stp->st_vfs_file);
149 dp->dl_vfs_file = stp->st_vfs_file;
150 dp->dl_type = type;
151 dp->dl_recall.cbr_dp = NULL;
152 dp->dl_recall.cbr_ident = cb->cb_ident;
153 dp->dl_recall.cbr_trunc = 0;
154 dp->dl_stateid.si_boot = boot_time;
155 dp->dl_stateid.si_stateownerid = current_delegid++;
156 dp->dl_stateid.si_fileid = 0;
157 dp->dl_stateid.si_generation = 0;
158 dp->dl_fhlen = current_fh->fh_handle.fh_size;
159 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
160 current_fh->fh_handle.fh_size);
161 dp->dl_time = 0;
162 atomic_set(&dp->dl_count, 1);
163 list_add(&dp->dl_del_perfile, &fp->fi_del_perfile);
164 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
165 alloc_delegation++;
166 return dp;
167}
168
169void
170nfs4_put_delegation(struct nfs4_delegation *dp)
171{
172 if (atomic_dec_and_test(&dp->dl_count)) {
173 dprintk("NFSD: freeing dp %p\n",dp);
174 kfree(dp);
175 free_delegation++;
176 }
177}
178
179/* Remove the associated file_lock first, then remove the delegation.
180 * lease_modify() is called to remove the FS_LEASE file_lock from
181 * the i_flock list, eventually calling nfsd's lock_manager
182 * fl_release_callback.
183 */
184static void
185nfs4_close_delegation(struct nfs4_delegation *dp)
186{
187 struct file *filp = dp->dl_vfs_file;
188
189 dprintk("NFSD: close_delegation dp %p\n",dp);
190 dp->dl_vfs_file = NULL;
191 /* The following nfsd_close may not actually close the file,
192 * but we want to remove the lease in any case. */
c907132d
N		 193 if (dp->dl_flock)
194 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4
LT		 195 nfsd_close(filp);
196 vfsclose++;
197}
198
199/* Called under the state lock. */
200static void
201unhash_delegation(struct nfs4_delegation *dp)
202{
203 list_del_init(&dp->dl_del_perfile);
204 list_del_init(&dp->dl_del_perclnt);
205 spin_lock(&recall_lock);
206 list_del_init(&dp->dl_recall_lru);
207 spin_unlock(&recall_lock);
208 nfs4_close_delegation(dp);
209 nfs4_put_delegation(dp);
210}
211
212/*
213 * SETCLIENTID state
214 */
215
216/* Hash tables for nfs4_clientid state */
217#define CLIENT_HASH_BITS 4
218#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
219#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
220
221#define clientid_hashval(id) \
222 ((id) & CLIENT_HASH_MASK)
223#define clientstr_hashval(name, namelen) \
224 (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
225/*
226 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
227 * used in reboot/reset lease grace period processing
228 *
229 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
230 * setclientid_confirmed info.
231 *
232 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
233 * setclientid info.
234 *
235 * client_lru holds client queue ordered by nfs4_client.cl_time
236 * for lease renewal.
237 *
238 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
239 * for last close replay.
240 */
241static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
242static int reclaim_str_hashtbl_size = 0;
243static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
244static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
245static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
246static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
247static struct list_head client_lru;
248static struct list_head close_lru;
249
250static inline void
251renew_client(struct nfs4_client *clp)
252{
253 /*
254 * Move client to the end to the LRU list.
255 */
256 dprintk("renewing client (clientid %08x/%08x)\n",
257 clp->cl_clientid.cl_boot,
258 clp->cl_clientid.cl_id);
259 list_move_tail(&clp->cl_lru, &client_lru);
260 clp->cl_time = get_seconds();
261}
262
263/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
264static int
265STALE_CLIENTID(clientid_t *clid)
266{
267 if (clid->cl_boot == boot_time)
268 return 0;
269 dprintk("NFSD stale clientid (%08x/%08x)\n",
270 clid->cl_boot, clid->cl_id);
271 return 1;
272}
273
274/*
275 * XXX Should we use a slab cache ?
276 * This type of memory management is somewhat inefficient, but we use it
277 * anyway since SETCLIENTID is not a common operation.
278 */
279static inline struct nfs4_client *
280alloc_client(struct xdr_netobj name)
281{
282 struct nfs4_client *clp;
283
284 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
285 memset(clp, 0, sizeof(*clp));
286 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
287 memcpy(clp->cl_name.data, name.data, name.len);
288 clp->cl_name.len = name.len;
289 }
290 else {
291 kfree(clp);
292 clp = NULL;
293 }
294 }
295 return clp;
296}
297
298static inline void
299free_client(struct nfs4_client *clp)
300{
301 if (clp->cl_cred.cr_group_info)
302 put_group_info(clp->cl_cred.cr_group_info);
303 kfree(clp->cl_name.data);
304 kfree(clp);
305}
306
307void
308put_nfs4_client(struct nfs4_client *clp)
309{
310 if (atomic_dec_and_test(&clp->cl_count))
311 free_client(clp);
312}
313
314static void
315expire_client(struct nfs4_client *clp)
316{
317 struct nfs4_stateowner *sop;
318 struct nfs4_delegation *dp;
319 struct nfs4_callback *cb = &clp->cl_callback;
320 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
321 struct list_head reaplist;
322
323 dprintk("NFSD: expire_client cl_count %d\n",
324 atomic_read(&clp->cl_count));
325
326 /* shutdown rpc client, ending any outstanding recall rpcs */
327 if (atomic_read(&cb->cb_set) == 1 && clnt) {
328 rpc_shutdown_client(clnt);
329 clnt = clp->cl_callback.cb_client = NULL;
330 }
331
332 INIT_LIST_HEAD(&reaplist);
333 spin_lock(&recall_lock);
334 while (!list_empty(&clp->cl_del_perclnt)) {
335 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
336 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
337 dp->dl_flock);
338 list_del_init(&dp->dl_del_perclnt);
339 list_move(&dp->dl_recall_lru, &reaplist);
340 }
341 spin_unlock(&recall_lock);
342 while (!list_empty(&reaplist)) {
343 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
344 list_del_init(&dp->dl_recall_lru);
345 unhash_delegation(dp);
346 }
347 list_del(&clp->cl_idhash);
348 list_del(&clp->cl_strhash);
349 list_del(&clp->cl_lru);
350 while (!list_empty(&clp->cl_perclient)) {
351 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
352 release_stateowner(sop);
353 }
354 put_nfs4_client(clp);
355}
356
357static struct nfs4_client *
358create_client(struct xdr_netobj name) {
359 struct nfs4_client *clp;
360
361 if (!(clp = alloc_client(name)))
362 goto out;
363 atomic_set(&clp->cl_count, 1);
364 atomic_set(&clp->cl_callback.cb_set, 0);
365 clp->cl_callback.cb_parsed = 0;
366 INIT_LIST_HEAD(&clp->cl_idhash);
367 INIT_LIST_HEAD(&clp->cl_strhash);
368 INIT_LIST_HEAD(&clp->cl_perclient);
369 INIT_LIST_HEAD(&clp->cl_del_perclnt);
370 INIT_LIST_HEAD(&clp->cl_lru);
371out:
372 return clp;
373}
374
375static void
376copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
377 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
378}
379
380static void
381copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
382 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
383 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
384}
385
386static void
387copy_cred(struct svc_cred *target, struct svc_cred *source) {
388
389 target->cr_uid = source->cr_uid;
390 target->cr_gid = source->cr_gid;
391 target->cr_group_info = source->cr_group_info;
392 get_group_info(target->cr_group_info);
393}
394
395static int
396cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
397 if (!n1 || !n2)
398 return 0;
399 return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
400}
401
402static int
403cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
404 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
405}
406
407static int
408cmp_clid(clientid_t * cl1, clientid_t * cl2) {
409 return((cl1->cl_boot == cl2->cl_boot) &&
410 (cl1->cl_id == cl2->cl_id));
411}
412
413/* XXX what about NGROUP */
414static int
415cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
416 return(cr1->cr_uid == cr2->cr_uid);
417
418}
419
420static void
421gen_clid(struct nfs4_client *clp) {
422 clp->cl_clientid.cl_boot = boot_time;
423 clp->cl_clientid.cl_id = current_clientid++;
424}
425
426static void
427gen_confirm(struct nfs4_client *clp) {
428 struct timespec tv;
429 u32 * p;
430
431 tv = CURRENT_TIME;
432 p = (u32 *)clp->cl_confirm.data;
433 *p++ = tv.tv_sec;
434 *p++ = tv.tv_nsec;
435}
436
437static int
438check_name(struct xdr_netobj name) {
439
440 if (name.len == 0)
441 return 0;
442 if (name.len > NFS4_OPAQUE_LIMIT) {
443 printk("NFSD: check_name: name too long(%d)!\n", name.len);
444 return 0;
445 }
446 return 1;
447}
448
449void
450add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
451{
452 unsigned int idhashval;
453
454 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
455 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
456 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
457 list_add_tail(&clp->cl_lru, &client_lru);
458 clp->cl_time = get_seconds();
459}
460
461void
462move_to_confirmed(struct nfs4_client *clp)
463{
464 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
465 unsigned int strhashval;
466
467 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
468 list_del_init(&clp->cl_strhash);
469 list_del_init(&clp->cl_idhash);
470 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
471 strhashval = clientstr_hashval(clp->cl_name.data,
472 clp->cl_name.len);
473 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
474 renew_client(clp);
475}
476
477static struct nfs4_client *
478find_confirmed_client(clientid_t *clid)
479{
480 struct nfs4_client *clp;
481 unsigned int idhashval = clientid_hashval(clid->cl_id);
482
483 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
484 if (cmp_clid(&clp->cl_clientid, clid))
485 return clp;
486 }
487 return NULL;
488}
489
490static struct nfs4_client *
491find_unconfirmed_client(clientid_t *clid)
492{
493 struct nfs4_client *clp;
494 unsigned int idhashval = clientid_hashval(clid->cl_id);
495
496 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
497 if (cmp_clid(&clp->cl_clientid, clid))
498 return clp;
499 }
500 return NULL;
501}
502
503/* a helper function for parse_callback */
504static int
505parse_octet(unsigned int *lenp, char **addrp)
506{
507 unsigned int len = *lenp;
508 char *p = *addrp;
509 int n = -1;
510 char c;
511
512 for (;;) {
513 if (!len)
514 break;
515 len--;
516 c = *p++;
517 if (c == '.')
518 break;
519 if ((c < '0') || (c > '9')) {
520 n = -1;
521 break;
522 }
523 if (n < 0)
524 n = 0;
525 n = (n * 10) + (c - '0');
526 if (n > 255) {
527 n = -1;
528 break;
529 }
530 }
531 *lenp = len;
532 *addrp = p;
533 return n;
534}
535
536/* parse and set the setclientid ipv4 callback address */
537int
538parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
539{
540 int temp = 0;
541 u32 cbaddr = 0;
542 u16 cbport = 0;
543 u32 addrlen = addr_len;
544 char *addr = addr_val;
545 int i, shift;
546
547 /* ipaddress */
548 shift = 24;
549 for(i = 4; i > 0 ; i--) {
550 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
551 return 0;
552 }
553 cbaddr |= (temp << shift);
554 if (shift > 0)
555 shift -= 8;
556 }
557 *cbaddrp = cbaddr;
558
559 /* port */
560 shift = 8;
561 for(i = 2; i > 0 ; i--) {
562 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
563 return 0;
564 }
565 cbport |= (temp << shift);
566 if (shift > 0)
567 shift -= 8;
568 }
569 *cbportp = cbport;
570 return 1;
571}
572
573void
574gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
575{
576 struct nfs4_callback *cb = &clp->cl_callback;
577
578 /* Currently, we only support tcp for the callback channel */
579 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
580 goto out_err;
581
582 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
583 &cb->cb_addr, &cb->cb_port)))
584 goto out_err;
585 cb->cb_prog = se->se_callback_prog;
586 cb->cb_ident = se->se_callback_ident;
587 cb->cb_parsed = 1;
588 return;
589out_err:
590 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
591 "will not receive delegations\n",
592 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
593
594 cb->cb_parsed = 0;
595 return;
596}
597
598/*
599 * RFC 3010 has a complex implmentation description of processing a
600 * SETCLIENTID request consisting of 5 bullets, labeled as
601 * CASE0 - CASE4 below.
602 *
603 * NOTES:
604 * callback information will be processed in a future patch
605 *
606 * an unconfirmed record is added when:
607 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
608 * CASE 1: confirmed record found with matching name, principal,
609 * verifier, and clientid.
610 * CASE 2: confirmed record found with matching name, principal,
611 * and there is no unconfirmed record with matching
612 * name and principal
613 *
614 * an unconfirmed record is replaced when:
615 * CASE 3: confirmed record found with matching name, principal,
616 * and an unconfirmed record is found with matching
617 * name, principal, and with clientid and
618 * confirm that does not match the confirmed record.
619 * CASE 4: there is no confirmed record with matching name and
620 * principal. there is an unconfirmed record with
621 * matching name, principal.
622 *
623 * an unconfirmed record is deleted when:
624 * CASE 1: an unconfirmed record that matches input name, verifier,
625 * and confirmed clientid.
626 * CASE 4: any unconfirmed records with matching name and principal
627 * that exist after an unconfirmed record has been replaced
628 * as described above.
629 *
630 */
631int
632nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
633{
634 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
635 struct xdr_netobj clname = {
636 .len = setclid->se_namelen,
637 .data = setclid->se_name,
638 };
639 nfs4_verifier clverifier = setclid->se_verf;
640 unsigned int strhashval;
641 struct nfs4_client * conf, * unconf, * new, * clp;
642 int status;
643
644 status = nfserr_inval;
645 if (!check_name(clname))
646 goto out;
647
648 /*
649 * XXX The Duplicate Request Cache (DRC) has been checked (??)
650 * We get here on a DRC miss.
651 */
652
653 strhashval = clientstr_hashval(clname.data, clname.len);
654
655 conf = NULL;
656 nfs4_lock_state();
657 list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
658 if (!cmp_name(&clp->cl_name, &clname))
659 continue;
660 /*
661 * CASE 0:
662 * clname match, confirmed, different principal
663 * or different ip_address
664 */
665 status = nfserr_clid_inuse;
666 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
667 printk("NFSD: setclientid: string in use by client"
668 "(clientid %08x/%08x)\n",
669 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
670 goto out;
671 }
672 if (clp->cl_addr != ip_addr) {
673 printk("NFSD: setclientid: string in use by client"
674 "(clientid %08x/%08x)\n",
675 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
676 goto out;
677 }
678
679 /*
680 * cl_name match from a previous SETCLIENTID operation
681 * XXX check for additional matches?
682 */
683 conf = clp;
684 break;
685 }
686 unconf = NULL;
687 list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
688 if (!cmp_name(&clp->cl_name, &clname))
689 continue;
690 /* cl_name match from a previous SETCLIENTID operation */
691 unconf = clp;
692 break;
693 }
694 status = nfserr_resource;
695 if (!conf) {
696 /*
697 * CASE 4:
698 * placed first, because it is the normal case.
699 */
700 if (unconf)
701 expire_client(unconf);
702 if (!(new = create_client(clname)))
703 goto out;
704 copy_verf(new, &clverifier);
705 new->cl_addr = ip_addr;
706 copy_cred(&new->cl_cred,&rqstp->rq_cred);
707 gen_clid(new);
708 gen_confirm(new);
709 gen_callback(new, setclid);
710 add_to_unconfirmed(new, strhashval);
711 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
712 /*
713 * CASE 1:
714 * cl_name match, confirmed, principal match
715 * verifier match: probable callback update
716 *
717 * remove any unconfirmed nfs4_client with
718 * matching cl_name, cl_verifier, and cl_clientid
719 *
720 * create and insert an unconfirmed nfs4_client with same
721 * cl_name, cl_verifier, and cl_clientid as existing
722 * nfs4_client, but with the new callback info and a
723 * new cl_confirm
724 */
725 if ((unconf) &&
726 cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
727 cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
728 expire_client(unconf);
729 }
730 if (!(new = create_client(clname)))
731 goto out;
732 copy_verf(new,&conf->cl_verifier);
733 new->cl_addr = ip_addr;
734 copy_cred(&new->cl_cred,&rqstp->rq_cred);
735 copy_clid(new, conf);
736 gen_confirm(new);
737 gen_callback(new, setclid);
738 add_to_unconfirmed(new,strhashval);
739 } else if (!unconf) {
740 /*
741 * CASE 2:
742 * clname match, confirmed, principal match
743 * verfier does not match
744 * no unconfirmed. create a new unconfirmed nfs4_client
745 * using input clverifier, clname, and callback info
746 * and generate a new cl_clientid and cl_confirm.
747 */
748 if (!(new = create_client(clname)))
749 goto out;
750 copy_verf(new,&clverifier);
751 new->cl_addr = ip_addr;
752 copy_cred(&new->cl_cred,&rqstp->rq_cred);
753 gen_clid(new);
754 gen_confirm(new);
755 gen_callback(new, setclid);
756 add_to_unconfirmed(new, strhashval);
757 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
758 /*
759 * CASE3:
760 * confirmed found (name, principal match)
761 * confirmed verifier does not match input clverifier
762 *
763 * unconfirmed found (name match)
764 * confirmed->cl_confirm != unconfirmed->cl_confirm
765 *
766 * remove unconfirmed.
767 *
768 * create an unconfirmed nfs4_client
769 * with same cl_name as existing confirmed nfs4_client,
770 * but with new callback info, new cl_clientid,
771 * new cl_verifier and a new cl_confirm
772 */
773 expire_client(unconf);
774 if (!(new = create_client(clname)))
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 {
784 /* No cases hit !!! */
785 status = nfserr_inval;
786 goto out;
787
788 }
789 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
790 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
791 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
792 status = nfs_ok;
793out:
794 nfs4_unlock_state();
795 return status;
796}
797
798
799/*
800 * RFC 3010 has a complex implmentation description of processing a
801 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
802 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
803 *
804 * NOTE: callback information will be processed here in a future patch
805 */
806int
807nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
808{
809 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
810 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
811 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
812 clientid_t * clid = &setclientid_confirm->sc_clientid;
813 int status;
814
815 if (STALE_CLIENTID(clid))
816 return nfserr_stale_clientid;
817 /*
818 * XXX The Duplicate Request Cache (DRC) has been checked (??)
819 * We get here on a DRC miss.
820 */
821
822 nfs4_lock_state();
823 clp = find_confirmed_client(clid);
824 if (clp) {
825 status = nfserr_inval;
826 /*
827 * Found a record for this clientid. If the IP addresses
828 * don't match, return ERR_INVAL just as if the record had
829 * not been found.
830 */
831 if (clp->cl_addr != ip_addr) {
832 printk("NFSD: setclientid: string in use by client"
833 "(clientid %08x/%08x)\n",
834 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
835 goto out;
836 }
837 conf = clp;
838 }
839 clp = find_unconfirmed_client(clid);
840 if (clp) {
841 status = nfserr_inval;
842 if (clp->cl_addr != ip_addr) {
843 printk("NFSD: setclientid: string in use by client"
844 "(clientid %08x/%08x)\n",
845 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
846 goto out;
847 }
848 unconf = clp;
849 }
850 /* CASE 1:
851 * unconf record that matches input clientid and input confirm.
852 * conf record that matches input clientid.
853 * conf and unconf records match names, verifiers
854 */
855 if ((conf && unconf) &&
856 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
857 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
858 (cmp_name(&conf->cl_name,&unconf->cl_name)) &&
859 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
860 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
861 status = nfserr_clid_inuse;
862 else {
863 expire_client(conf);
864 clp = unconf;
865 move_to_confirmed(unconf);
866 status = nfs_ok;
867 }
868 goto out;
869 }
870 /* CASE 2:
871 * conf record that matches input clientid.
872 * if unconf record that matches input clientid, then unconf->cl_name
873 * or unconf->cl_verifier don't match the conf record.
874 */
875 if ((conf && !unconf) ||
876 ((conf && unconf) &&
877 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
878 !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
879 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
880 status = nfserr_clid_inuse;
881 } else {
882 clp = conf;
883 status = nfs_ok;
884 }
885 goto out;
886 }
887 /* CASE 3:
888 * conf record not found.
889 * unconf record found.
890 * unconf->cl_confirm matches input confirm
891 */
892 if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
893 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
894 status = nfserr_clid_inuse;
895 } else {
896 status = nfs_ok;
897 clp = unconf;
898 move_to_confirmed(unconf);
899 }
900 goto out;
901 }
902 /* CASE 4:
903 * conf record not found, or if conf, then conf->cl_confirm does not
904 * match input confirm.
905 * unconf record not found, or if unconf, then unconf->cl_confirm
906 * does not match input confirm.
907 */
908 if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
909 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
910 status = nfserr_stale_clientid;
911 goto out;
912 }
913 /* check that we have hit one of the cases...*/
914 status = nfserr_inval;
915 goto out;
916out:
917 if (!status)
918 nfsd4_probe_callback(clp);
919 nfs4_unlock_state();
920 return status;
921}
922
923/*
924 * Open owner state (share locks)
925 */
926
927/* hash tables for nfs4_stateowner */
928#define OWNER_HASH_BITS 8
929#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
930#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
931
932#define ownerid_hashval(id) \
933 ((id) & OWNER_HASH_MASK)
934#define ownerstr_hashval(clientid, ownername) \
935 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
936
937static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
938static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
939
940/* hash table for nfs4_file */
941#define FILE_HASH_BITS 8
942#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
943#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
944/* hash table for (open)nfs4_stateid */
945#define STATEID_HASH_BITS 10
946#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
947#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
948
949#define file_hashval(x) \
950 hash_ptr(x, FILE_HASH_BITS)
951#define stateid_hashval(owner_id, file_id) \
952 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
953
954static struct list_head file_hashtbl[FILE_HASH_SIZE];
955static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
956
957/* OPEN Share state helper functions */
958static inline struct nfs4_file *
959alloc_init_file(struct inode *ino)
960{
961 struct nfs4_file *fp;
962 unsigned int hashval = file_hashval(ino);
963
964 if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
965 INIT_LIST_HEAD(&fp->fi_hash);
966 INIT_LIST_HEAD(&fp->fi_perfile);
967 INIT_LIST_HEAD(&fp->fi_del_perfile);
968 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
969 fp->fi_inode = igrab(ino);
970 fp->fi_id = current_fileid++;
971 alloc_file++;
972 return fp;
973 }
974 return NULL;
975}
976
977static void
978release_all_files(void)
979{
980 int i;
981 struct nfs4_file *fp;
982
983 for (i=0;i<FILE_HASH_SIZE;i++) {
984 while (!list_empty(&file_hashtbl[i])) {
985 fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
986 /* this should never be more than once... */
987 if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) {
988 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
989 }
990 release_file(fp);
991 }
992 }
993}
994
995kmem_cache_t *stateowner_slab = NULL;
996
997static int
998nfsd4_init_slabs(void)
999{
1000 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1001 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1002 if (stateowner_slab == NULL) {
1003 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1004 return -ENOMEM;
1005 }
1006 return 0;
1007}
1008
1009static void
1010nfsd4_free_slabs(void)
1011{
1012 int status = 0;
1013
1014 if (stateowner_slab)
1015 status = kmem_cache_destroy(stateowner_slab);
1016 stateowner_slab = NULL;
1017 BUG_ON(status);
1018}
1019
1020void
1021nfs4_free_stateowner(struct kref *kref)
1022{
1023 struct nfs4_stateowner *sop =
1024 container_of(kref, struct nfs4_stateowner, so_ref);
1025 kfree(sop->so_owner.data);
1026 kmem_cache_free(stateowner_slab, sop);
1027}
1028
1029static inline struct nfs4_stateowner *
1030alloc_stateowner(struct xdr_netobj *owner)
1031{
1032 struct nfs4_stateowner *sop;
1033
1034 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1035 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1036 memcpy(sop->so_owner.data, owner->data, owner->len);
1037 sop->so_owner.len = owner->len;
1038 kref_init(&sop->so_ref);
1039 return sop;
1040 }
1041 kmem_cache_free(stateowner_slab, sop);
1042 }
1043 return NULL;
1044}
1045
1046static struct nfs4_stateowner *
1047alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1048 struct nfs4_stateowner *sop;
1049 struct nfs4_replay *rp;
1050 unsigned int idhashval;
1051
1052 if (!(sop = alloc_stateowner(&open->op_owner)))
1053 return NULL;
1054 idhashval = ownerid_hashval(current_ownerid);
1055 INIT_LIST_HEAD(&sop->so_idhash);
1056 INIT_LIST_HEAD(&sop->so_strhash);
1057 INIT_LIST_HEAD(&sop->so_perclient);
1058 INIT_LIST_HEAD(&sop->so_perfilestate);
1059 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1060 INIT_LIST_HEAD(&sop->so_close_lru);
1061 sop->so_time = 0;
1062 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1063 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1064 list_add(&sop->so_perclient, &clp->cl_perclient);
1065 add_perclient++;
1066 sop->so_is_open_owner = 1;
1067 sop->so_id = current_ownerid++;
1068 sop->so_client = clp;
1069 sop->so_seqid = open->op_seqid;
1070 sop->so_confirmed = 0;
1071 rp = &sop->so_replay;
1072 rp->rp_status = NFSERR_SERVERFAULT;
1073 rp->rp_buflen = 0;
1074 rp->rp_buf = rp->rp_ibuf;
1075 return sop;
1076}
1077
1078static void
1079release_stateid_lockowners(struct nfs4_stateid *open_stp)
1080{
1081 struct nfs4_stateowner *lock_sop;
1082
1083 while (!list_empty(&open_stp->st_perlockowner)) {
1084 lock_sop = list_entry(open_stp->st_perlockowner.next,
1085 struct nfs4_stateowner, so_perlockowner);
1086 /* list_del(&open_stp->st_perlockowner); */
1087 BUG_ON(lock_sop->so_is_open_owner);
1088 release_stateowner(lock_sop);
1089 }
1090}
1091
1092static void
1093unhash_stateowner(struct nfs4_stateowner *sop)
1094{
1095 struct nfs4_stateid *stp;
1096
1097 list_del(&sop->so_idhash);
1098 list_del(&sop->so_strhash);
1099 if (sop->so_is_open_owner) {
1100 list_del(&sop->so_perclient);
1101 del_perclient++;
1102 }
1103 list_del(&sop->so_perlockowner);
1104 while (!list_empty(&sop->so_perfilestate)) {
1105 stp = list_entry(sop->so_perfilestate.next,
1106 struct nfs4_stateid, st_perfilestate);
1107 if (sop->so_is_open_owner)
1108 release_stateid(stp, OPEN_STATE);
1109 else
1110 release_stateid(stp, LOCK_STATE);
1111 }
1112}
1113
1114static void
1115release_stateowner(struct nfs4_stateowner *sop)
1116{
1117 unhash_stateowner(sop);
1118 list_del(&sop->so_close_lru);
1119 nfs4_put_stateowner(sop);
1120}
1121
1122static inline void
1123init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1124 struct nfs4_stateowner *sop = open->op_stateowner;
1125 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1126
1127 INIT_LIST_HEAD(&stp->st_hash);
1128 INIT_LIST_HEAD(&stp->st_perfilestate);
1129 INIT_LIST_HEAD(&stp->st_perlockowner);
1130 INIT_LIST_HEAD(&stp->st_perfile);
1131 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1132 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1133 list_add_perfile++;
1134 list_add(&stp->st_perfile, &fp->fi_perfile);
1135 stp->st_stateowner = sop;
1136 stp->st_file = fp;
1137 stp->st_stateid.si_boot = boot_time;
1138 stp->st_stateid.si_stateownerid = sop->so_id;
1139 stp->st_stateid.si_fileid = fp->fi_id;
1140 stp->st_stateid.si_generation = 0;
1141 stp->st_access_bmap = 0;
1142 stp->st_deny_bmap = 0;
1143 __set_bit(open->op_share_access, &stp->st_access_bmap);
1144 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1145}
1146
1147static void
1148release_stateid(struct nfs4_stateid *stp, int flags)
1149{
1150 struct file *filp = stp->st_vfs_file;
1151
1152 list_del(&stp->st_hash);
1153 list_del_perfile++;
1154 list_del(&stp->st_perfile);
1155 list_del(&stp->st_perfilestate);
1156 if (flags & OPEN_STATE) {
1157 release_stateid_lockowners(stp);
1158 stp->st_vfs_file = NULL;
1159 nfsd_close(filp);
1160 vfsclose++;
1161 } else if (flags & LOCK_STATE)
1162 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1163 kfree(stp);
1164 stp = NULL;
1165}
1166
1167static void
1168release_file(struct nfs4_file *fp)
1169{
1170 free_file++;
1171 list_del(&fp->fi_hash);
1172 iput(fp->fi_inode);
1173 kfree(fp);
1174}
1175
1176void
1177move_to_close_lru(struct nfs4_stateowner *sop)
1178{
1179 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1180
1181 unhash_stateowner(sop);
1182 list_add_tail(&sop->so_close_lru, &close_lru);
1183 sop->so_time = get_seconds();
1184}
1185
1186void
1187release_state_owner(struct nfs4_stateid *stp, int flag)
1188{
1189 struct nfs4_stateowner *sop = stp->st_stateowner;
1190 struct nfs4_file *fp = stp->st_file;
1191
1192 dprintk("NFSD: release_state_owner\n");
1193 release_stateid(stp, flag);
1194
1195 /* place unused nfs4_stateowners on so_close_lru list to be
1196 * released by the laundromat service after the lease period
1197 * to enable us to handle CLOSE replay
1198 */
1199 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1200 move_to_close_lru(sop);
1201 /* unused nfs4_file's are releseed. XXX slab cache? */
1202 if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) {
1203 release_file(fp);
1204 }
1205}
1206
1207static int
1208cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1209 return ((sop->so_owner.len == owner->len) &&
1210 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1211 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1212}
1213
1214static struct nfs4_stateowner *
1215find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1216{
1217 struct nfs4_stateowner *so = NULL;
1218
1219 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1220 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1221 return so;
1222 }
1223 return NULL;
1224}
1225
1226/* search file_hashtbl[] for file */
1227static struct nfs4_file *
1228find_file(struct inode *ino)
1229{
1230 unsigned int hashval = file_hashval(ino);
1231 struct nfs4_file *fp;
1232
1233 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1234 if (fp->fi_inode == ino)
1235 return fp;
1236 }
1237 return NULL;
1238}
1239
1240#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1241#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1242
1243void
1244set_access(unsigned int *access, unsigned long bmap) {
1245 int i;
1246
1247 *access = 0;
1248 for (i = 1; i < 4; i++) {
1249 if (test_bit(i, &bmap))
1250 *access |= i;
1251 }
1252}
1253
1254void
1255set_deny(unsigned int *deny, unsigned long bmap) {
1256 int i;
1257
1258 *deny = 0;
1259 for (i = 0; i < 4; i++) {
1260 if (test_bit(i, &bmap))
1261 *deny |= i ;
1262 }
1263}
1264
1265static int
1266test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1267 unsigned int access, deny;
1268
1269 set_access(&access, stp->st_access_bmap);
1270 set_deny(&deny, stp->st_deny_bmap);
1271 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1272 return 0;
1273 return 1;
1274}
1275
1276/*
1277 * Called to check deny when READ with all zero stateid or
1278 * WRITE with all zero or all one stateid
1279 */
1280int
1281nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1282{
1283 struct inode *ino = current_fh->fh_dentry->d_inode;
1284 struct nfs4_file *fp;
1285 struct nfs4_stateid *stp;
1286
1287 dprintk("NFSD: nfs4_share_conflict\n");
1288
1289 fp = find_file(ino);
1290 if (fp) {
1291 /* Search for conflicting share reservations */
1292 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1293 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1294 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1295 return nfserr_share_denied;
1296 }
1297 }
1298 return nfs_ok;
1299}
1300
1301static inline void
1302nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1303{
1304 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1305 put_write_access(filp->f_dentry->d_inode);
1306 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1307 }
1308}
1309
1310/*
1311 * Recall a delegation
1312 */
1313static int
1314do_recall(void *__dp)
1315{
1316 struct nfs4_delegation *dp = __dp;
1317
1318 daemonize("nfsv4-recall");
1319
1320 nfsd4_cb_recall(dp);
1321 return 0;
1322}
1323
1324/*
1325 * Spawn a thread to perform a recall on the delegation represented
1326 * by the lease (file_lock)
1327 *
1328 * Called from break_lease() with lock_kernel() held.
1329 * Note: we assume break_lease will only call this *once* for any given
1330 * lease.
1331 */
1332static
1333void nfsd_break_deleg_cb(struct file_lock *fl)
1334{
1335 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1336 struct task_struct *t;
1337
1338 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1339 if (!dp)
1340 return;
1341
1342 /* We're assuming the state code never drops its reference
1343 * without first removing the lease. Since we're in this lease
1344 * callback (and since the lease code is serialized by the kernel
1345 * lock) we know the server hasn't removed the lease yet, we know
1346 * it's safe to take a reference: */
1347 atomic_inc(&dp->dl_count);
1348
1349 spin_lock(&recall_lock);
1350 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1351 spin_unlock(&recall_lock);
1352
1353 /* only place dl_time is set. protected by lock_kernel*/
1354 dp->dl_time = get_seconds();
1355
1356 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1357 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1358
1359 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1360 if (IS_ERR(t)) {
1361 struct nfs4_client *clp = dp->dl_client;
1362
1363 printk(KERN_INFO "NFSD: Callback thread failed for "
1364 "for client (clientid %08x/%08x)\n",
1365 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1366 nfs4_put_delegation(dp);
1367 }
1368}
1369
1370/*
1371 * The file_lock is being reapd.
1372 *
1373 * Called by locks_free_lock() with lock_kernel() held.
1374 */
1375static
1376void nfsd_release_deleg_cb(struct file_lock *fl)
1377{
1378 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1379
1380 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1381
1382 if (!(fl->fl_flags & FL_LEASE) || !dp)
1383 return;
1384 dp->dl_flock = NULL;
1385}
1386
1387/*
1388 * Set the delegation file_lock back pointer.
1389 *
1390 * Called from __setlease() with lock_kernel() held.
1391 */
1392static
1393void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1394{
1395 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1396
1397 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1398 if (!dp)
1399 return;
1400 dp->dl_flock = new;
1401}
1402
1403/*
1404 * Called from __setlease() with lock_kernel() held
1405 */
1406static
1407int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1408{
1409 struct nfs4_delegation *onlistd =
1410 (struct nfs4_delegation *)onlist->fl_owner;
1411 struct nfs4_delegation *tryd =
1412 (struct nfs4_delegation *)try->fl_owner;
1413
1414 if (onlist->fl_lmops != try->fl_lmops)
1415 return 0;
1416
1417 return onlistd->dl_client == tryd->dl_client;
1418}
1419
1420
1421static
1422int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1423{
1424 if (arg & F_UNLCK)
1425 return lease_modify(onlist, arg);
1426 else
1427 return -EAGAIN;
1428}
1429
1430struct lock_manager_operations nfsd_lease_mng_ops = {
1431 .fl_break = nfsd_break_deleg_cb,
1432 .fl_release_private = nfsd_release_deleg_cb,
1433 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1434 .fl_mylease = nfsd_same_client_deleg_cb,
1435 .fl_change = nfsd_change_deleg_cb,
1436};
1437
1438
1439/*
1440 * nfsd4_process_open1()
1441 * lookup stateowner.
1442 * found:
1443 * check confirmed
1444 * confirmed:
1445 * check seqid
1446 * not confirmed:
1447 * delete owner
1448 * create new owner
1449 * notfound:
1450 * verify clientid
1451 * create new owner
1452 *
1453 * called with nfs4_lock_state() held.
1454 */
1455int
1456nfsd4_process_open1(struct nfsd4_open *open)
1457{
1458 int status;
1459 clientid_t *clientid = &open->op_clientid;
1460 struct nfs4_client *clp = NULL;
1461 unsigned int strhashval;
1462 struct nfs4_stateowner *sop = NULL;
1463
1464 status = nfserr_inval;
1465 if (!check_name(open->op_owner))
1466 goto out;
1467
1468 if (STALE_CLIENTID(&open->op_clientid))
1469 return nfserr_stale_clientid;
1470
1471 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1472 sop = find_openstateowner_str(strhashval, open);
1473 if (sop) {
1474 open->op_stateowner = sop;
1475 /* check for replay */
1476 if (open->op_seqid == sop->so_seqid){
1477 if (sop->so_replay.rp_buflen)
1478 return NFSERR_REPLAY_ME;
1479 else {
1480 /* The original OPEN failed so spectacularly
1481 * that we don't even have replay data saved!
1482 * Therefore, we have no choice but to continue
1483 * processing this OPEN; presumably, we'll
1484 * fail again for the same reason.
1485 */
1486 dprintk("nfsd4_process_open1:"
1487 " replay with no replay cache\n");
1488 goto renew;
1489 }
1490 } else if (sop->so_confirmed) {
1491 if (open->op_seqid == sop->so_seqid + 1)
1492 goto renew;
1493 status = nfserr_bad_seqid;
1494 goto out;
1495 } else {
1496 /* If we get here, we received an OPEN for an
1497 * unconfirmed nfs4_stateowner. Since the seqid's are
1498 * different, purge the existing nfs4_stateowner, and
1499 * instantiate a new one.
1500 */
1501 clp = sop->so_client;
1502 release_stateowner(sop);
1503 }
1504 } else {
1505 /* nfs4_stateowner not found.
1506 * Verify clientid and instantiate new nfs4_stateowner.
1507 * If verify fails this is presumably the result of the
1508 * client's lease expiring.
1509 */
1510 status = nfserr_expired;
1511 clp = find_confirmed_client(clientid);
1512 if (clp == NULL)
1513 goto out;
1514 }
1515 status = nfserr_resource;
1516 sop = alloc_init_open_stateowner(strhashval, clp, open);
1517 if (sop == NULL)
1518 goto out;
1519 open->op_stateowner = sop;
1520renew:
1521 status = nfs_ok;
1522 renew_client(sop->so_client);
1523out:
1524 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1525 status = nfserr_reclaim_bad;
1526 return status;
1527}
1528
4a6e43e6
N		 1529static inline int
1530nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1531{
1532 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1533 return nfserr_openmode;
1534 else
1535 return nfs_ok;
1536}
1537
52f4fb43
N		 1538static struct nfs4_delegation *
1539find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1540{
1541 struct nfs4_delegation *dp;
1542
1543 list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
1544 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1545 return dp;
1546 }
1547 return NULL;
1548}
1549
567d9829
N		 1550static void
1551nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1552 struct nfs4_delegation **dp)
1553{
1554 int flags;
1555 int status;
1556
1557 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1558 if (*dp == NULL)
1559 return;
1560 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1561 RD_STATE : WR_STATE;
1562 status = nfs4_check_delegmode(*dp, flags);
1563 if (status)
1564 *dp = NULL;
1565 return;
1566}
1567
1da177e4
LT		 1568static int
1569nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1570{
1571 struct nfs4_stateid *local;
1572 int status = nfserr_share_denied;
1573 struct nfs4_stateowner *sop = open->op_stateowner;
1574
1575 list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
1576 /* ignore lock owners */
1577 if (local->st_stateowner->so_is_open_owner == 0)
1578 continue;
1579 /* remember if we have seen this open owner */
1580 if (local->st_stateowner == sop)
1581 *stpp = local;
1582 /* check for conflicting share reservations */
1583 if (!test_share(local, open))
1584 goto out;
1585 }
1586 status = 0;
1587out:
1588 return status;
1589}
1590
1591static int
1592nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1593 struct nfs4_delegation *dp,
1da177e4
LT		 1594 struct svc_fh *cur_fh, int flags)
1595{
1596 struct nfs4_stateid *stp;
1da177e4
LT		 1597
1598 stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
1599 if (stp == NULL)
1600 return nfserr_resource;
1601
567d9829
N		 1602 if (dp) {
1603 get_file(dp->dl_vfs_file);
1604 stp->st_vfs_file = dp->dl_vfs_file;
1605 } else {
1606 int status;
1607 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1608 &stp->st_vfs_file);
1609 if (status) {
1610 if (status == nfserr_dropit)
1611 status = nfserr_jukebox;
1612 kfree(stp);
1613 return status;
1614 }
1da177e4
LT		 1615 }
1616 vfsopen++;
1617 *stpp = stp;
1618 return 0;
1619}
1620
1621static inline int
1622nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1623 struct nfsd4_open *open)
1624{
1625 struct iattr iattr = {
1626 .ia_valid = ATTR_SIZE,
1627 .ia_size = 0,
1628 };
1629 if (!open->op_truncate)
1630 return 0;
1631 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1632 return -EINVAL;
1633 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1634}
1635
1636static int
1637nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1638{
1639 struct file *filp = stp->st_vfs_file;
1640 struct inode *inode = filp->f_dentry->d_inode;
1641 unsigned int share_access;
1642 int status;
1643
1644 set_access(&share_access, stp->st_access_bmap);
1645 share_access = ~share_access;
1646 share_access &= open->op_share_access;
1647
1648 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1649 return nfsd4_truncate(rqstp, cur_fh, open);
1650
1651 status = get_write_access(inode);
1652 if (status)
1653 return nfserrno(status);
1654 status = nfsd4_truncate(rqstp, cur_fh, open);
1655 if (status) {
1656 put_write_access(inode);
1657 return status;
1658 }
1659 /* remember the open */
1660 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1661 set_bit(open->op_share_access, &stp->st_access_bmap);
1662 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1663
1664 return nfs_ok;
1665}
1666
1667
1668/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1669static void
1670nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1671{
1672 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1673 if (*status)
1674 *status = nfserr_reclaim_bad;
1675 else {
1676 open->op_stateowner->so_confirmed = 1;
1677 open->op_stateowner->so_seqid--;
1678 }
1679 }
1680}
1681
1682/*
1683 * Attempt to hand out a delegation.
1684 */
1685static void
1686nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1687{
1688 struct nfs4_delegation *dp;
1689 struct nfs4_stateowner *sop = stp->st_stateowner;
1690 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1691 struct file_lock fl, *flp = &fl;
1692 int status, flag = 0;
1693
1694 flag = NFS4_OPEN_DELEGATE_NONE;
1695 if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
1696 || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
1697 goto out;
1698
1699 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1700 flag = NFS4_OPEN_DELEGATE_WRITE;
1701 else
1702 flag = NFS4_OPEN_DELEGATE_READ;
1703
1704 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1705 if (dp == NULL) {
1706 flag = NFS4_OPEN_DELEGATE_NONE;
1707 goto out;
1708 }
1709 locks_init_lock(&fl);
1710 fl.fl_lmops = &nfsd_lease_mng_ops;
1711 fl.fl_flags = FL_LEASE;
1712 fl.fl_end = OFFSET_MAX;
1713 fl.fl_owner = (fl_owner_t)dp;
1714 fl.fl_file = stp->st_vfs_file;
1715 fl.fl_pid = current->tgid;
1716
1717 /* setlease checks to see if delegation should be handed out.
1718 * the lock_manager callbacks fl_mylease and fl_change are used
1719 */
1720 if ((status = setlease(stp->st_vfs_file,
1721 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1722 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1723 unhash_delegation(dp);
1da177e4
LT		 1724 flag = NFS4_OPEN_DELEGATE_NONE;
1725 goto out;
1726 }
1727
1728 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1729
1730 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1731 dp->dl_stateid.si_boot,
1732 dp->dl_stateid.si_stateownerid,
1733 dp->dl_stateid.si_fileid,
1734 dp->dl_stateid.si_generation);
1735out:
1736 open->op_delegate_type = flag;
1737}
1738
1739/*
1740 * called with nfs4_lock_state() held.
1741 */
1742int
1743nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1744{
1745 struct nfs4_file *fp = NULL;
1746 struct inode *ino = current_fh->fh_dentry->d_inode;
1747 struct nfs4_stateid *stp = NULL;
567d9829 1748 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1749 int status;
1750
1751 status = nfserr_inval;
1752 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1753 goto out;
1754 /*
1755 * Lookup file; if found, lookup stateid and check open request,
1756 * and check for delegations in the process of being recalled.
1757 * If not found, create the nfs4_file struct
1758 */
1759 fp = find_file(ino);
1760 if (fp) {
1761 if ((status = nfs4_check_open(fp, open, &stp)))
1762 goto out;
567d9829 1763 nfs4_check_deleg(fp, open, &dp);
1da177e4
LT		 1764 } else {
1765 status = nfserr_resource;
1766 fp = alloc_init_file(ino);
1767 if (fp == NULL)
1768 goto out;
1769 }
1770
1771 /*
1772 * OPEN the file, or upgrade an existing OPEN.
1773 * If truncate fails, the OPEN fails.
1774 */
1775 if (stp) {
1776 /* Stateid was found, this is an OPEN upgrade */
1777 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1778 if (status)
1779 goto out;
1780 } else {
1781 /* Stateid was not found, this is a new OPEN */
1782 int flags = 0;
1783 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1784 flags = MAY_WRITE;
1785 else
1786 flags = MAY_READ;
567d9829
N		 1787 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1788 if (status)
1da177e4
LT		 1789 goto out;
1790 init_stateid(stp, fp, open);
1791 status = nfsd4_truncate(rqstp, current_fh, open);
1792 if (status) {
1793 release_stateid(stp, OPEN_STATE);
1794 goto out;
1795 }
1796 }
1797 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1798
1799 /*
1800 * Attempt to hand out a delegation. No error return, because the
1801 * OPEN succeeds even if we fail.
1802 */
1803 nfs4_open_delegation(current_fh, open, stp);
1804
1805 status = nfs_ok;
1806
1807 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1808 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1809 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1810out:
1811 /* take the opportunity to clean up unused state */
1812 if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
1813 release_file(fp);
1814
1815 /* CLAIM_PREVIOUS has different error returns */
1816 nfs4_set_claim_prev(open, &status);
1817 /*
1818 * To finish the open response, we just need to set the rflags.
1819 */
1820 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1821 if (!open->op_stateowner->so_confirmed)
1822 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1823
1824 return status;
1825}
1826
1827static struct work_struct laundromat_work;
1828static void laundromat_main(void *);
1829static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1830
1831int
1832nfsd4_renew(clientid_t *clid)
1833{
1834 struct nfs4_client *clp;
1835 int status;
1836
1837 nfs4_lock_state();
1838 dprintk("process_renew(%08x/%08x): starting\n",
1839 clid->cl_boot, clid->cl_id);
1840 status = nfserr_stale_clientid;
1841 if (STALE_CLIENTID(clid))
1842 goto out;
1843 clp = find_confirmed_client(clid);
1844 status = nfserr_expired;
1845 if (clp == NULL) {
1846 /* We assume the client took too long to RENEW. */
1847 dprintk("nfsd4_renew: clientid not found!\n");
1848 goto out;
1849 }
1850 renew_client(clp);
1851 status = nfserr_cb_path_down;
1852 if (!list_empty(&clp->cl_del_perclnt)
1853 && !atomic_read(&clp->cl_callback.cb_set))
1854 goto out;
1855 status = nfs_ok;
1856out:
1857 nfs4_unlock_state();
1858 return status;
1859}
1860
1861time_t
1862nfs4_laundromat(void)
1863{
1864 struct nfs4_client *clp;
1865 struct nfs4_stateowner *sop;
1866 struct nfs4_delegation *dp;
1867 struct list_head *pos, *next, reaplist;
1868 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1869 time_t t, clientid_val = NFSD_LEASE_TIME;
1870 time_t u, test_val = NFSD_LEASE_TIME;
1871
1872 nfs4_lock_state();
1873
1874 dprintk("NFSD: laundromat service - starting\n");
1875 list_for_each_safe(pos, next, &client_lru) {
1876 clp = list_entry(pos, struct nfs4_client, cl_lru);
1877 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1878 t = clp->cl_time - cutoff;
1879 if (clientid_val > t)
1880 clientid_val = t;
1881 break;
1882 }
1883 dprintk("NFSD: purging unused client (clientid %08x)\n",
1884 clp->cl_clientid.cl_id);
1885 expire_client(clp);
1886 }
1887 INIT_LIST_HEAD(&reaplist);
1888 spin_lock(&recall_lock);
1889 list_for_each_safe(pos, next, &del_recall_lru) {
1890 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1891 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1892 u = dp->dl_time - cutoff;
1893 if (test_val > u)
1894 test_val = u;
1895 break;
1896 }
1897 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1898 dp, dp->dl_flock);
1899 list_move(&dp->dl_recall_lru, &reaplist);
1900 }
1901 spin_unlock(&recall_lock);
1902 list_for_each_safe(pos, next, &reaplist) {
1903 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1904 list_del_init(&dp->dl_recall_lru);
1905 unhash_delegation(dp);
1906 }
1907 test_val = NFSD_LEASE_TIME;
1908 list_for_each_safe(pos, next, &close_lru) {
1909 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1910 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1911 u = sop->so_time - cutoff;
1912 if (test_val > u)
1913 test_val = u;
1914 break;
1915 }
1916 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1917 sop->so_id);
1918 list_del(&sop->so_close_lru);
1919 nfs4_put_stateowner(sop);
1920 }
1921 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1922 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1923 nfs4_unlock_state();
1924 return clientid_val;
1925}
1926
1927void
1928laundromat_main(void *not_used)
1929{
1930 time_t t;
1931
1932 t = nfs4_laundromat();
1933 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1934 schedule_delayed_work(&laundromat_work, t*HZ);
1935}
1936
1937/* search ownerid_hashtbl[] and close_lru for stateid owner
1938 * (stateid->si_stateownerid)
1939 */
1940struct nfs4_stateowner *
1941find_openstateowner_id(u32 st_id, int flags) {
1942 struct nfs4_stateowner *local = NULL;
1943
1944 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1945 if (flags & CLOSE_STATE) {
1946 list_for_each_entry(local, &close_lru, so_close_lru) {
1947 if (local->so_id == st_id)
1948 return local;
1949 }
1950 }
1951 return NULL;
1952}
1953
1954static inline int
1955nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1956{
1957 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1958}
1959
1960static int
1961STALE_STATEID(stateid_t *stateid)
1962{
1963 if (stateid->si_boot == boot_time)
1964 return 0;
1965 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1966 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1967 stateid->si_generation);
1968 return 1;
1969}
1970
1971static inline int
1972access_permit_read(unsigned long access_bmap)
1973{
1974 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1975 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1976 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1977}
1978
1979static inline int
1980access_permit_write(unsigned long access_bmap)
1981{
1982 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1983 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1984}
1985
1986static
1987int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1988{
1989 int status = nfserr_openmode;
1990
1991 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1992 goto out;
1993 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1994 goto out;
1995 status = nfs_ok;
1996out:
1997 return status;
1998}
1999
1da177e4
LT		 2000static inline int
2001check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2002{
2003 /* Trying to call delegreturn with a special stateid? Yuch: */
2004 if (!(flags & (RD_STATE | WR_STATE)))
2005 return nfserr_bad_stateid;
2006 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2007 return nfs_ok;
2008 else if (nfs4_in_grace()) {
2009 /* Answer in remaining cases depends on existance of
2010 * conflicting state; so we must wait out the grace period. */
2011 return nfserr_grace;
2012 } else if (flags & WR_STATE)
2013 return nfs4_share_conflict(current_fh,
2014 NFS4_SHARE_DENY_WRITE);
2015 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2016 return nfs4_share_conflict(current_fh,
2017 NFS4_SHARE_DENY_READ);
2018}
2019
2020/*
2021 * Allow READ/WRITE during grace period on recovered state only for files
2022 * that are not able to provide mandatory locking.
2023 */
2024static inline int
2025io_during_grace_disallowed(struct inode *inode, int flags)
2026{
2027 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2028 && MANDATORY_LOCK(inode);
2029}
2030
2031/*
2032* Checks for stateid operations
2033*/
2034int
2035nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2036{
2037 struct nfs4_stateid *stp = NULL;
2038 struct nfs4_delegation *dp = NULL;
2039 stateid_t *stidp;
2040 struct inode *ino = current_fh->fh_dentry->d_inode;
2041 int status;
2042
2043 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2044 stateid->si_boot, stateid->si_stateownerid,
2045 stateid->si_fileid, stateid->si_generation);
2046 if (filpp)
2047 *filpp = NULL;
2048
2049 if (io_during_grace_disallowed(ino, flags))
2050 return nfserr_grace;
2051
2052 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2053 return check_special_stateids(current_fh, stateid, flags);
2054
2055 /* STALE STATEID */
2056 status = nfserr_stale_stateid;
2057 if (STALE_STATEID(stateid))
2058 goto out;
2059
2060 /* BAD STATEID */
2061 status = nfserr_bad_stateid;
2062 if (!stateid->si_fileid) { /* delegation stateid */
2063 if(!(dp = find_delegation_stateid(ino, stateid))) {
2064 dprintk("NFSD: delegation stateid not found\n");
2065 if (nfs4_in_grace())
2066 status = nfserr_grace;
2067 goto out;
2068 }
2069 stidp = &dp->dl_stateid;
2070 } else { /* open or lock stateid */
2071 if (!(stp = find_stateid(stateid, flags))) {
2072 dprintk("NFSD: open or lock stateid not found\n");
2073 if (nfs4_in_grace())
2074 status = nfserr_grace;
2075 goto out;
2076 }
2077 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2078 goto out;
2079 if (!stp->st_stateowner->so_confirmed)
2080 goto out;
2081 stidp = &stp->st_stateid;
2082 }
2083 if (stateid->si_generation > stidp->si_generation)
2084 goto out;
2085
2086 /* OLD STATEID */
2087 status = nfserr_old_stateid;
2088 if (stateid->si_generation < stidp->si_generation)
2089 goto out;
2090 if (stp) {
2091 if ((status = nfs4_check_openmode(stp,flags)))
2092 goto out;
2093 renew_client(stp->st_stateowner->so_client);
2094 if (filpp)
2095 *filpp = stp->st_vfs_file;
2096 } else if (dp) {
2097 if ((status = nfs4_check_delegmode(dp, flags)))
2098 goto out;
2099 renew_client(dp->dl_client);
2100 if (flags & DELEG_RET)
2101 unhash_delegation(dp);
2102 if (filpp)
2103 *filpp = dp->dl_vfs_file;
2104 }
2105 status = nfs_ok;
2106out:
2107 return status;
2108}
2109
2110
2111/*
2112 * Checks for sequence id mutating operations.
2113 */
2114int
2115nfs4_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)
2116{
2117 int status;
2118 struct nfs4_stateid *stp;
2119 struct nfs4_stateowner *sop;
2120
2121 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2122 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2123 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2124 stateid->si_generation);
2125
2126 *stpp = NULL;
2127 *sopp = NULL;
2128
2129 status = nfserr_bad_stateid;
2130 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2131 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2132 goto out;
2133 }
2134
2135 status = nfserr_stale_stateid;
2136 if (STALE_STATEID(stateid))
2137 goto out;
2138 /*
2139 * We return BAD_STATEID if filehandle doesn't match stateid,
2140 * the confirmed flag is incorrecly set, or the generation
2141 * number is incorrect.
2142 * If there is no entry in the openfile table for this id,
2143 * we can't always return BAD_STATEID;
2144 * this might be a retransmitted CLOSE which has arrived after
2145 * the openfile has been released.
2146 */
2147 if (!(stp = find_stateid(stateid, flags)))
2148 goto no_nfs4_stateid;
2149
2150 status = nfserr_bad_stateid;
2151
2152 /* for new lock stateowners:
2153 * check that the lock->v.new.open_stateid
2154 * refers to an open stateowner
2155 *
2156 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2157 * as the open_stateid->st_stateowner->so_client->clientid
2158 */
2159 if (lockclid) {
2160 struct nfs4_stateowner *sop = stp->st_stateowner;
2161 struct nfs4_client *clp = sop->so_client;
2162
2163 if (!sop->so_is_open_owner)
2164 goto out;
2165 if (!cmp_clid(&clp->cl_clientid, lockclid))
2166 goto out;
2167 }
2168
2169 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2170 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2171 goto out;
2172 }
2173
2174 *stpp = stp;
2175 *sopp = sop = stp->st_stateowner;
2176
2177 /*
2178 * We now validate the seqid and stateid generation numbers.
2179 * For the moment, we ignore the possibility of
2180 * generation number wraparound.
2181 */
2182 if (seqid != sop->so_seqid + 1)
2183 goto check_replay;
2184
2185 if (sop->so_confirmed) {
2186 if (flags & CONFIRM) {
2187 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2188 goto out;
2189 }
2190 }
2191 else {
2192 if (!(flags & CONFIRM)) {
2193 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2194 goto out;
2195 }
2196 }
2197 if (stateid->si_generation > stp->st_stateid.si_generation) {
2198 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2199 goto out;
2200 }
2201
2202 status = nfserr_old_stateid;
2203 if (stateid->si_generation < stp->st_stateid.si_generation) {
2204 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2205 goto out;
2206 }
2207 /* XXX renew the client lease here */
2208 status = nfs_ok;
2209
2210out:
2211 return status;
2212
2213no_nfs4_stateid:
2214
2215 /*
2216 * We determine whether this is a bad stateid or a replay,
2217 * starting by trying to look up the stateowner.
2218 * If stateowner is not found - stateid is bad.
2219 */
2220 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2221 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2222 status = nfserr_bad_stateid;
2223 goto out;
2224 }
2225 *sopp = sop;
2226
2227check_replay:
2228 if (seqid == sop->so_seqid) {
2229 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2230 /* indicate replay to calling function */
2231 status = NFSERR_REPLAY_ME;
2232 } else {
2233 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2234
2235 *sopp = NULL;
2236 status = nfserr_bad_seqid;
2237 }
2238 goto out;
2239}
2240
2241int
2242nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2243{
2244 int status;
2245 struct nfs4_stateowner *sop;
2246 struct nfs4_stateid *stp;
2247
2248 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2249 (int)current_fh->fh_dentry->d_name.len,
2250 current_fh->fh_dentry->d_name.name);
2251
2252 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2253 goto out;
2254
2255 nfs4_lock_state();
2256
2257 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2258 &oc->oc_req_stateid,
2259 CHECK_FH | CONFIRM | OPEN_STATE,
2260 &oc->oc_stateowner, &stp, NULL)))
2261 goto out;
2262
2263 sop = oc->oc_stateowner;
2264 sop->so_confirmed = 1;
2265 update_stateid(&stp->st_stateid);
2266 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2267 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2268 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2269 stp->st_stateid.si_boot,
2270 stp->st_stateid.si_stateownerid,
2271 stp->st_stateid.si_fileid,
2272 stp->st_stateid.si_generation);
2273out:
2274 if (oc->oc_stateowner)
2275 nfs4_get_stateowner(oc->oc_stateowner);
2276 nfs4_unlock_state();
2277 return status;
2278}
2279
2280
2281/*
2282 * unset all bits in union bitmap (bmap) that
2283 * do not exist in share (from successful OPEN_DOWNGRADE)
2284 */
2285static void
2286reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2287{
2288 int i;
2289 for (i = 1; i < 4; i++) {
2290 if ((i & access) != i)
2291 __clear_bit(i, bmap);
2292 }
2293}
2294
2295static void
2296reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2297{
2298 int i;
2299 for (i = 0; i < 4; i++) {
2300 if ((i & deny) != i)
2301 __clear_bit(i, bmap);
2302 }
2303}
2304
2305int
2306nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2307{
2308 int status;
2309 struct nfs4_stateid *stp;
2310 unsigned int share_access;
2311
2312 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2313 (int)current_fh->fh_dentry->d_name.len,
2314 current_fh->fh_dentry->d_name.name);
2315
2316 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2317 return nfserr_inval;
2318
2319 nfs4_lock_state();
2320 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2321 &od->od_stateid,
2322 CHECK_FH | OPEN_STATE,
2323 &od->od_stateowner, &stp, NULL)))
2324 goto out;
2325
2326 status = nfserr_inval;
2327 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2328 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2329 stp->st_access_bmap, od->od_share_access);
2330 goto out;
2331 }
2332 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2333 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2334 stp->st_deny_bmap, od->od_share_deny);
2335 goto out;
2336 }
2337 set_access(&share_access, stp->st_access_bmap);
2338 nfs4_file_downgrade(stp->st_vfs_file,
2339 share_access & ~od->od_share_access);
2340
2341 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2342 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2343
2344 update_stateid(&stp->st_stateid);
2345 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2346 status = nfs_ok;
2347out:
2348 if (od->od_stateowner)
2349 nfs4_get_stateowner(od->od_stateowner);
2350 nfs4_unlock_state();
2351 return status;
2352}
2353
2354/*
2355 * nfs4_unlock_state() called after encode
2356 */
2357int
2358nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2359{
2360 int status;
2361 struct nfs4_stateid *stp;
2362
2363 dprintk("NFSD: nfsd4_close on file %.*s\n",
2364 (int)current_fh->fh_dentry->d_name.len,
2365 current_fh->fh_dentry->d_name.name);
2366
2367 nfs4_lock_state();
2368 /* check close_lru for replay */
2369 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2370 &close->cl_stateid,
2371 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2372 &close->cl_stateowner, &stp, NULL)))
2373 goto out;
2374 /*
2375 * Return success, but first update the stateid.
2376 */
2377 status = nfs_ok;
2378 update_stateid(&stp->st_stateid);
2379 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2380
2381 /* release_state_owner() calls nfsd_close() if needed */
2382 release_state_owner(stp, OPEN_STATE);
2383out:
2384 if (close->cl_stateowner)
2385 nfs4_get_stateowner(close->cl_stateowner);
2386 nfs4_unlock_state();
2387 return status;
2388}
2389
2390int
2391nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2392{
2393 int status;
2394
2395 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2396 goto out;
2397
2398 nfs4_lock_state();
2399 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2400 nfs4_unlock_state();
2401out:
2402 return status;
2403}
2404
2405
2406/*
2407 * Lock owner state (byte-range locks)
2408 */
2409#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2410#define LOCK_HASH_BITS 8
2411#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2412#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2413
2414#define lockownerid_hashval(id) \
2415 ((id) & LOCK_HASH_MASK)
2416
2417static inline unsigned int
2418lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2419 struct xdr_netobj *ownername)
2420{
2421 return (file_hashval(inode) + cl_id
2422 + opaque_hashval(ownername->data, ownername->len))
2423 & LOCK_HASH_MASK;
2424}
2425
2426static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2427static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2428static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2429
2430struct nfs4_stateid *
2431find_stateid(stateid_t *stid, int flags)
2432{
2433 struct nfs4_stateid *local = NULL;
2434 u32 st_id = stid->si_stateownerid;
2435 u32 f_id = stid->si_fileid;
2436 unsigned int hashval;
2437
2438 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2439 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2440 hashval = stateid_hashval(st_id, f_id);
2441 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2442 if ((local->st_stateid.si_stateownerid == st_id) &&
2443 (local->st_stateid.si_fileid == f_id))
2444 return local;
2445 }
2446 }
2447 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2448 hashval = stateid_hashval(st_id, f_id);
2449 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2450 if ((local->st_stateid.si_stateownerid == st_id) &&
2451 (local->st_stateid.si_fileid == f_id))
2452 return local;
2453 }
2454 } else
2455 printk("NFSD: find_stateid: ERROR: no state flag\n");
2456 return NULL;
2457}
2458
2459static struct nfs4_delegation *
2460find_delegation_stateid(struct inode *ino, stateid_t *stid)
2461{
1da177e4 2462 struct nfs4_file *fp = NULL;
1da177e4
LT		 2463
2464 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2465 stid->si_boot, stid->si_stateownerid,
2466 stid->si_fileid, stid->si_generation);
2467
1da177e4 2468 fp = find_file(ino);
52f4fb43
N		 2469 if (fp)
2470 return find_delegation_file(fp, stid);
1da177e4
LT		 2471 return NULL;
2472}
2473
2474/*
2475 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2476 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2477 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2478 * locking, this prevents us from being completely protocol-compliant. The
2479 * real solution to this problem is to start using unsigned file offsets in
2480 * the VFS, but this is a very deep change!
2481 */
2482static inline void
2483nfs4_transform_lock_offset(struct file_lock *lock)
2484{
2485 if (lock->fl_start < 0)
2486 lock->fl_start = OFFSET_MAX;
2487 if (lock->fl_end < 0)
2488 lock->fl_end = OFFSET_MAX;
2489}
2490
2491int
2492nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2493{
2494 struct nfs4_stateowner *local = NULL;
2495 int status = 0;
2496
2497 if (hashval >= LOCK_HASH_SIZE)
2498 goto out;
2499 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2500 if (local == sop) {
2501 status = 1;
2502 goto out;
2503 }
2504 }
2505out:
2506 return status;
2507}
2508
2509
2510static inline void
2511nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2512{
2513 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2514 unsigned int hval = lockownerid_hashval(sop->so_id);
2515
2516 deny->ld_sop = NULL;
2517 if (nfs4_verify_lock_stateowner(sop, hval)) {
2518 kref_get(&sop->so_ref);
2519 deny->ld_sop = sop;
2520 deny->ld_clientid = sop->so_client->cl_clientid;
2521 }
2522 deny->ld_start = fl->fl_start;
2523 deny->ld_length = ~(u64)0;
2524 if (fl->fl_end != ~(u64)0)
2525 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2526 deny->ld_type = NFS4_READ_LT;
2527 if (fl->fl_type != F_RDLCK)
2528 deny->ld_type = NFS4_WRITE_LT;
2529}
2530
2531static struct nfs4_stateowner *
2532find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2533{
2534 struct nfs4_stateowner *local = NULL;
2535 int i;
2536
2537 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2538 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2539 if (!cmp_owner_str(local, owner, clid))
2540 continue;
2541 return local;
2542 }
2543 }
2544 return NULL;
2545}
2546
2547static struct nfs4_stateowner *
2548find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2549 struct xdr_netobj *owner)
2550{
2551 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2552 struct nfs4_stateowner *op;
2553
2554 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2555 if (cmp_owner_str(op, owner, clid))
2556 return op;
2557 }
2558 return NULL;
2559}
2560
2561/*
2562 * Alloc a lock owner structure.
2563 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2564 * occured.
2565 *
2566 * strhashval = lock_ownerstr_hashval
2567 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2568 */
2569
2570static struct nfs4_stateowner *
2571alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2572 struct nfs4_stateowner *sop;
2573 struct nfs4_replay *rp;
2574 unsigned int idhashval;
2575
2576 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2577 return NULL;
2578 idhashval = lockownerid_hashval(current_ownerid);
2579 INIT_LIST_HEAD(&sop->so_idhash);
2580 INIT_LIST_HEAD(&sop->so_strhash);
2581 INIT_LIST_HEAD(&sop->so_perclient);
2582 INIT_LIST_HEAD(&sop->so_perfilestate);
2583 INIT_LIST_HEAD(&sop->so_perlockowner);
2584 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2585 sop->so_time = 0;
2586 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2587 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2588 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2589 sop->so_is_open_owner = 0;
2590 sop->so_id = current_ownerid++;
2591 sop->so_client = clp;
2592 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2593 sop->so_confirmed = 1;
2594 rp = &sop->so_replay;
2595 rp->rp_status = NFSERR_SERVERFAULT;
2596 rp->rp_buflen = 0;
2597 rp->rp_buf = rp->rp_ibuf;
2598 return sop;
2599}
2600
2601struct nfs4_stateid *
2602alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2603{
2604 struct nfs4_stateid *stp;
2605 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2606
2607 if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2608 GFP_KERNEL)) == NULL)
2609 goto out;
2610 INIT_LIST_HEAD(&stp->st_hash);
2611 INIT_LIST_HEAD(&stp->st_perfile);
2612 INIT_LIST_HEAD(&stp->st_perfilestate);
2613 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2614 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2615 list_add(&stp->st_perfile, &fp->fi_perfile);
2616 list_add_perfile++;
2617 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2618 stp->st_stateowner = sop;
2619 stp->st_file = fp;
2620 stp->st_stateid.si_boot = boot_time;
2621 stp->st_stateid.si_stateownerid = sop->so_id;
2622 stp->st_stateid.si_fileid = fp->fi_id;
2623 stp->st_stateid.si_generation = 0;
2624 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2625 stp->st_access_bmap = open_stp->st_access_bmap;
2626 stp->st_deny_bmap = open_stp->st_deny_bmap;
2627
2628out:
2629 return stp;
2630}
2631
2632int
2633check_lock_length(u64 offset, u64 length)
2634{
2635 return ((length == 0) || ((length != ~(u64)0) &&
2636 LOFF_OVERFLOW(offset, length)));
2637}
2638
2639/*
2640 * LOCK operation
2641 */
2642int
2643nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2644{
2645 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2646 struct nfs4_stateid *lock_stp;
2647 struct file *filp;
2648 struct file_lock file_lock;
2649 struct file_lock *conflock;
2650 int status = 0;
2651 unsigned int strhashval;
2652
2653 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2654 (long long) lock->lk_offset,
2655 (long long) lock->lk_length);
2656
2657 if (nfs4_in_grace() && !lock->lk_reclaim)
2658 return nfserr_grace;
2659 if (!nfs4_in_grace() && lock->lk_reclaim)
2660 return nfserr_no_grace;
2661
2662 if (check_lock_length(lock->lk_offset, lock->lk_length))
2663 return nfserr_inval;
2664
2665 nfs4_lock_state();
2666
2667 if (lock->lk_is_new) {
2668 /*
2669 * Client indicates that this is a new lockowner.
2670 * Use open owner and open stateid to create lock owner and lock
2671 * stateid.
2672 */
2673 struct nfs4_stateid *open_stp = NULL;
2674 struct nfs4_file *fp;
2675
2676 status = nfserr_stale_clientid;
2677 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2678 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2679 goto out;
2680 }
2681
2682 /* is the new lock seqid presented by the client zero? */
2683 status = nfserr_bad_seqid;
2684 if (lock->v.new.lock_seqid != 0)
2685 goto out;
2686
2687 /* validate and update open stateid and open seqid */
2688 status = nfs4_preprocess_seqid_op(current_fh,
2689 lock->lk_new_open_seqid,
2690 &lock->lk_new_open_stateid,
2691 CHECK_FH | OPEN_STATE,
2692 &open_sop, &open_stp,
2693 &lock->v.new.clientid);
2694 if (status) {
2695 if (lock->lk_reclaim)
2696 status = nfserr_reclaim_bad;
2697 goto out;
2698 }
2699 /* create lockowner and lock stateid */
2700 fp = open_stp->st_file;
2701 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2702 open_sop->so_client->cl_clientid.cl_id,
2703 &lock->v.new.owner);
2704 /*
2705 * If we already have this lock owner, the client is in
2706 * error (or our bookeeping is wrong!)
2707 * for asking for a 'new lock'.
2708 */
2709 status = nfserr_bad_stateid;
2710 lock_sop = find_lockstateowner(&lock->v.new.owner,
2711 &lock->v.new.clientid);
2712 if (lock_sop)
2713 goto out;
2714 status = nfserr_resource;
2715 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2716 goto out;
2717 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2718 fp, open_stp)) == NULL) {
2719 release_stateowner(lock->lk_stateowner);
2720 lock->lk_stateowner = NULL;
2721 goto out;
2722 }
2723 /* bump the open seqid used to create the lock */
2724 open_sop->so_seqid++;
2725 } else {
2726 /* lock (lock owner + lock stateid) already exists */
2727 status = nfs4_preprocess_seqid_op(current_fh,
2728 lock->lk_old_lock_seqid,
2729 &lock->lk_old_lock_stateid,
2730 CHECK_FH | LOCK_STATE,
2731 &lock->lk_stateowner, &lock_stp, NULL);
2732 if (status)
2733 goto out;
2734 }
2735 /* lock->lk_stateowner and lock_stp have been created or found */
2736 filp = lock_stp->st_vfs_file;
2737
2738 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2739 printk("NFSD: nfsd4_lock: permission denied!\n");
2740 goto out;
2741 }
2742
2743 locks_init_lock(&file_lock);
2744 switch (lock->lk_type) {
2745 case NFS4_READ_LT:
2746 case NFS4_READW_LT:
2747 file_lock.fl_type = F_RDLCK;
2748 break;
2749 case NFS4_WRITE_LT:
2750 case NFS4_WRITEW_LT:
2751 file_lock.fl_type = F_WRLCK;
2752 break;
2753 default:
2754 status = nfserr_inval;
2755 goto out;
2756 }
2757 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2758 file_lock.fl_pid = current->tgid;
2759 file_lock.fl_file = filp;
2760 file_lock.fl_flags = FL_POSIX;
2761
2762 file_lock.fl_start = lock->lk_offset;
2763 if ((lock->lk_length == ~(u64)0) ||
2764 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2765 file_lock.fl_end = ~(u64)0;
2766 else
2767 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2768 nfs4_transform_lock_offset(&file_lock);
2769
2770 /*
2771 * Try to lock the file in the VFS.
2772 * Note: locks.c uses the BKL to protect the inode's lock list.
2773 */
2774
2775 status = posix_lock_file(filp, &file_lock);
2776 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2777 file_lock.fl_ops->fl_release_private(&file_lock);
2778 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2779 switch (-status) {
2780 case 0: /* success! */
2781 update_stateid(&lock_stp->st_stateid);
2782 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2783 sizeof(stateid_t));
2784 goto out;
2785 case (EAGAIN):
2786 goto conflicting_lock;
2787 case (EDEADLK):
2788 status = nfserr_deadlock;
2789 default:
2790 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2791 goto out_destroy_new_stateid;
2792 }
2793
2794conflicting_lock:
2795 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2796 status = nfserr_denied;
2797 /* XXX There is a race here. Future patch needed to provide
2798 * an atomic posix_lock_and_test_file
2799 */
2800 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2801 status = nfserr_serverfault;
2802 goto out;
2803 }
2804 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2805
2806out_destroy_new_stateid:
2807 if (lock->lk_is_new) {
2808 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2809 /*
2810 * An error encountered after instantiation of the new
2811 * stateid has forced us to destroy it.
2812 */
2813 if (!seqid_mutating_err(status))
2814 open_sop->so_seqid--;
2815
2816 release_state_owner(lock_stp, LOCK_STATE);
2817 }
2818out:
2819 if (lock->lk_stateowner)
2820 nfs4_get_stateowner(lock->lk_stateowner);
2821 nfs4_unlock_state();
2822 return status;
2823}
2824
2825/*
2826 * LOCKT operation
2827 */
2828int
2829nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2830{
2831 struct inode *inode;
2832 struct file file;
2833 struct file_lock file_lock;
2834 struct file_lock *conflicting_lock;
2835 int status;
2836
2837 if (nfs4_in_grace())
2838 return nfserr_grace;
2839
2840 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2841 return nfserr_inval;
2842
2843 lockt->lt_stateowner = NULL;
2844 nfs4_lock_state();
2845
2846 status = nfserr_stale_clientid;
2847 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2848 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2849 goto out;
2850 }
2851
2852 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2853 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2854 if (status == nfserr_symlink)
2855 status = nfserr_inval;
2856 goto out;
2857 }
2858
2859 inode = current_fh->fh_dentry->d_inode;
2860 locks_init_lock(&file_lock);
2861 switch (lockt->lt_type) {
2862 case NFS4_READ_LT:
2863 case NFS4_READW_LT:
2864 file_lock.fl_type = F_RDLCK;
2865 break;
2866 case NFS4_WRITE_LT:
2867 case NFS4_WRITEW_LT:
2868 file_lock.fl_type = F_WRLCK;
2869 break;
2870 default:
2871 printk("NFSD: nfs4_lockt: bad lock type!\n");
2872 status = nfserr_inval;
2873 goto out;
2874 }
2875
2876 lockt->lt_stateowner = find_lockstateowner_str(inode,
2877 &lockt->lt_clientid, &lockt->lt_owner);
2878 if (lockt->lt_stateowner)
2879 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2880 file_lock.fl_pid = current->tgid;
2881 file_lock.fl_flags = FL_POSIX;
2882
2883 file_lock.fl_start = lockt->lt_offset;
2884 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2885 file_lock.fl_end = ~(u64)0;
2886 else
2887 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2888
2889 nfs4_transform_lock_offset(&file_lock);
2890
2891 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2892 * since LOCKT doesn't require an OPEN, and therefore a struct
2893 * file may not exist, pass posix_test_lock a struct file with
2894 * only the dentry:inode set.
2895 */
2896 memset(&file, 0, sizeof (struct file));
2897 file.f_dentry = current_fh->fh_dentry;
2898
2899 status = nfs_ok;
2900 conflicting_lock = posix_test_lock(&file, &file_lock);
2901 if (conflicting_lock) {
2902 status = nfserr_denied;
2903 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2904 }
2905out:
2906 nfs4_unlock_state();
2907 return status;
2908}
2909
2910int
2911nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2912{
2913 struct nfs4_stateid *stp;
2914 struct file *filp = NULL;
2915 struct file_lock file_lock;
2916 int status;
2917
2918 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2919 (long long) locku->lu_offset,
2920 (long long) locku->lu_length);
2921
2922 if (check_lock_length(locku->lu_offset, locku->lu_length))
2923 return nfserr_inval;
2924
2925 nfs4_lock_state();
2926
2927 if ((status = nfs4_preprocess_seqid_op(current_fh,
2928 locku->lu_seqid,
2929 &locku->lu_stateid,
2930 CHECK_FH | LOCK_STATE,
2931 &locku->lu_stateowner, &stp, NULL)))
2932 goto out;
2933
2934 filp = stp->st_vfs_file;
2935 BUG_ON(!filp);
2936 locks_init_lock(&file_lock);
2937 file_lock.fl_type = F_UNLCK;
2938 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2939 file_lock.fl_pid = current->tgid;
2940 file_lock.fl_file = filp;
2941 file_lock.fl_flags = FL_POSIX;
2942 file_lock.fl_start = locku->lu_offset;
2943
2944 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2945 file_lock.fl_end = ~(u64)0;
2946 else
2947 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2948 nfs4_transform_lock_offset(&file_lock);
2949
2950 /*
2951 * Try to unlock the file in the VFS.
2952 */
2953 status = posix_lock_file(filp, &file_lock);
2954 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2955 file_lock.fl_ops->fl_release_private(&file_lock);
2956 if (status) {
2957 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2958 goto out_nfserr;
2959 }
2960 /*
2961 * OK, unlock succeeded; the only thing left to do is update the stateid.
2962 */
2963 update_stateid(&stp->st_stateid);
2964 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2965
2966out:
2967 if (locku->lu_stateowner)
2968 nfs4_get_stateowner(locku->lu_stateowner);
2969 nfs4_unlock_state();
2970 return status;
2971
2972out_nfserr:
2973 status = nfserrno(status);
2974 goto out;
2975}
2976
2977/*
2978 * returns
2979 * 1: locks held by lockowner
2980 * 0: no locks held by lockowner
2981 */
2982static int
2983check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2984{
2985 struct file_lock **flpp;
2986 struct inode *inode = filp->f_dentry->d_inode;
2987 int status = 0;
2988
2989 lock_kernel();
2990 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2991 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2992 status = 1;
2993 goto out;
2994 }
2995out:
2996 unlock_kernel();
2997 return status;
2998}
2999
3000int
3001nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3002{
3003 clientid_t *clid = &rlockowner->rl_clientid;
3004 struct nfs4_stateowner *local = NULL;
3005 struct xdr_netobj *owner = &rlockowner->rl_owner;
3006 int status;
3007
3008 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3009 clid->cl_boot, clid->cl_id);
3010
3011 /* XXX check for lease expiration */
3012
3013 status = nfserr_stale_clientid;
3014 if (STALE_CLIENTID(clid)) {
3015 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3016 return status;
3017 }
3018
3019 nfs4_lock_state();
3020
3021 status = nfs_ok;
3022 local = find_lockstateowner(owner, clid);
3023 if (local) {
3024 struct nfs4_stateid *stp;
3025
3026 /* check for any locks held by any stateid
3027 * associated with the (lock) stateowner */
3028 status = nfserr_locks_held;
3029 list_for_each_entry(stp, &local->so_perfilestate,
3030 st_perfilestate) {
3031 if (check_for_locks(stp->st_vfs_file, local))
3032 goto out;
3033 }
3034 /* no locks held by (lock) stateowner */
3035 status = nfs_ok;
3036 release_stateowner(local);
3037 }
3038out:
3039 nfs4_unlock_state();
3040 return status;
3041}
3042
3043static inline struct nfs4_client_reclaim *
3044alloc_reclaim(int namelen)
3045{
3046 struct nfs4_client_reclaim *crp = NULL;
3047
3048 crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3049 if (!crp)
3050 return NULL;
3051 crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3052 if (!crp->cr_name.data) {
3053 kfree(crp);
3054 return NULL;
3055 }
3056 return crp;
3057}
3058
3059/*
3060 * failure => all reset bets are off, nfserr_no_grace...
3061 */
3062static int
3063nfs4_client_to_reclaim(char *name, int namlen)
3064{
3065 unsigned int strhashval;
3066 struct nfs4_client_reclaim *crp = NULL;
3067
3068 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3069 crp = alloc_reclaim(namlen);
3070 if (!crp)
3071 return 0;
3072 strhashval = clientstr_hashval(name, namlen);
3073 INIT_LIST_HEAD(&crp->cr_strhash);
3074 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3075 memcpy(crp->cr_name.data, name, namlen);
3076 crp->cr_name.len = namlen;
3077 reclaim_str_hashtbl_size++;
3078 return 1;
3079}
3080
3081static void
3082nfs4_release_reclaim(void)
3083{
3084 struct nfs4_client_reclaim *crp = NULL;
3085 int i;
3086
3087 BUG_ON(!nfs4_reclaim_init);
3088 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3089 while (!list_empty(&reclaim_str_hashtbl[i])) {
3090 crp = list_entry(reclaim_str_hashtbl[i].next,
3091 struct nfs4_client_reclaim, cr_strhash);
3092 list_del(&crp->cr_strhash);
3093 kfree(crp->cr_name.data);
3094 kfree(crp);
3095 reclaim_str_hashtbl_size--;
3096 }
3097 }
3098 BUG_ON(reclaim_str_hashtbl_size);
3099}
3100
3101/*
3102 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3103struct nfs4_client_reclaim *
3104nfs4_find_reclaim_client(clientid_t *clid)
3105{
3106 unsigned int strhashval;
3107 struct nfs4_client *clp;
3108 struct nfs4_client_reclaim *crp = NULL;
3109
3110
3111 /* find clientid in conf_id_hashtbl */
3112 clp = find_confirmed_client(clid);
3113 if (clp == NULL)
3114 return NULL;
3115
3116 dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3117 clp->cl_name.len, clp->cl_name.data);
3118
3119 /* find clp->cl_name in reclaim_str_hashtbl */
3120 strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3121 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3122 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3123 return crp;
3124 }
3125 }
3126 return NULL;
3127}
3128
3129/*
3130* Called from OPEN. Look for clientid in reclaim list.
3131*/
3132int
3133nfs4_check_open_reclaim(clientid_t *clid)
3134{
3135 struct nfs4_client_reclaim *crp;
3136
3137 if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
3138 return nfserr_reclaim_bad;
3139 return nfs_ok;
3140}
3141
3142
3143/*
3144 * Start and stop routines
3145 */
3146
3147static void
3148__nfs4_state_init(void)
3149{
3150 int i;
3151 time_t grace_time;
3152
3153 if (!nfs4_reclaim_init) {
3154 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3155 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3156 reclaim_str_hashtbl_size = 0;
3157 nfs4_reclaim_init = 1;
3158 }
3159 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3160 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3161 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3162 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3163 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3164 }
3165 for (i = 0; i < FILE_HASH_SIZE; i++) {
3166 INIT_LIST_HEAD(&file_hashtbl[i]);
3167 }
3168 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3169 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3170 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3171 }
3172 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3173 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3174 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3175 }
3176 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3177 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3178 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3179 }
3180 memset(&zerostateid, 0, sizeof(stateid_t));
3181 memset(&onestateid, ~0, sizeof(stateid_t));
3182
3183 INIT_LIST_HEAD(&close_lru);
3184 INIT_LIST_HEAD(&client_lru);
3185 INIT_LIST_HEAD(&del_recall_lru);
3186 spin_lock_init(&recall_lock);
3187 boot_time = get_seconds();
3188 grace_time = max(old_lease_time, lease_time);
3189 if (reclaim_str_hashtbl_size == 0)
3190 grace_time = 0;
3191 if (grace_time)
3192 printk("NFSD: starting %ld-second grace period\n", grace_time);
3193 grace_end = boot_time + grace_time;
3194 INIT_WORK(&laundromat_work,laundromat_main, NULL);
3195 schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
3196}
3197
3198int
3199nfs4_state_init(void)
3200{
3201 int status;
3202
3203 if (nfs4_init)
3204 return 0;
3205 status = nfsd4_init_slabs();
3206 if (status)
3207 return status;
3208 __nfs4_state_init();
3209 nfs4_init = 1;
3210 return 0;
3211}
3212
3213int
3214nfs4_in_grace(void)
3215{
3216 return get_seconds() < grace_end;
3217}
3218
3219void
3220set_no_grace(void)
3221{
3222 printk("NFSD: ERROR in reboot recovery. State reclaims will fail.\n");
3223 grace_end = get_seconds();
3224}
3225
3226time_t
3227nfs4_lease_time(void)
3228{
3229 return lease_time;
3230}
3231
3232static void
3233__nfs4_state_shutdown(void)
3234{
3235 int i;
3236 struct nfs4_client *clp = NULL;
3237 struct nfs4_delegation *dp = NULL;
3238 struct nfs4_stateowner *sop = NULL;
3239 struct list_head *pos, *next, reaplist;
3240
3241 list_for_each_safe(pos, next, &close_lru) {
3242 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3243 list_del(&sop->so_close_lru);
3244 nfs4_put_stateowner(sop);
3245 }
3246
3247 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3248 while (!list_empty(&conf_id_hashtbl[i])) {
3249 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3250 expire_client(clp);
3251 }
3252 while (!list_empty(&unconf_str_hashtbl[i])) {
3253 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3254 expire_client(clp);
3255 }
3256 }
3257 INIT_LIST_HEAD(&reaplist);
3258 spin_lock(&recall_lock);
3259 list_for_each_safe(pos, next, &del_recall_lru) {
3260 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3261 list_move(&dp->dl_recall_lru, &reaplist);
3262 }
3263 spin_unlock(&recall_lock);
3264 list_for_each_safe(pos, next, &reaplist) {
3265 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3266 list_del_init(&dp->dl_recall_lru);
3267 unhash_delegation(dp);
3268 }
3269
3270 release_all_files();
3271 cancel_delayed_work(&laundromat_work);
3272 flush_scheduled_work();
3273 nfs4_init = 0;
3274 dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
3275 list_add_perfile, list_del_perfile);
3276 dprintk("NFSD: add_perclient %d del_perclient %d\n",
3277 add_perclient, del_perclient);
3278 dprintk("NFSD: alloc_file %d free_file %d\n",
3279 alloc_file, free_file);
3280 dprintk("NFSD: vfsopen %d vfsclose %d\n",
3281 vfsopen, vfsclose);
3282 dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
3283 alloc_delegation, free_delegation);
3284
3285}
3286
3287void
3288nfs4_state_shutdown(void)
3289{
3290 nfs4_lock_state();
3291 nfs4_release_reclaim();
3292 __nfs4_state_shutdown();
3293 nfsd4_free_slabs();
3294 nfs4_unlock_state();
3295}
3296
3297/*
3298 * Called when leasetime is changed.
3299 *
3300 * if nfsd is not started, simply set the global lease.
3301 *
3302 * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
3303 * e.g: boot_time is reset, existing nfs4_client structs are
3304 * used to fill reclaim_str_hashtbl, then all state (except for the
3305 * reclaim_str_hashtbl) is re-initialized.
3306 *
3307 * if the old lease time is greater than the new lease time, the grace
3308 * period needs to be set to the old lease time to allow clients to reclaim
3309 * their state. XXX - we may want to set the grace period == lease time
3310 * after an initial grace period == old lease time
3311 *
3312 * if an error occurs in this process, the new lease is set, but the server
3313 * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
3314 * which means OPEN/LOCK/READ/WRITE will fail during grace period.
3315 *
3316 * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
3317 * OPEN and LOCK reclaims.
3318 */
3319void
3320nfs4_reset_lease(time_t leasetime)
3321{
3322 struct nfs4_client *clp;
3323 int i;
3324
3325 printk("NFSD: New leasetime %ld\n",leasetime);
3326 if (!nfs4_init)
3327 return;
3328 nfs4_lock_state();
3329 old_lease_time = lease_time;
3330 lease_time = leasetime;
3331
3332 nfs4_release_reclaim();
3333
3334 /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
3335 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3336 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
3337 if (!nfs4_client_to_reclaim(clp->cl_name.data,
3338 clp->cl_name.len)) {
3339 nfs4_release_reclaim();
3340 goto init_state;
3341 }
3342 }
3343 }
3344init_state:
3345 __nfs4_state_shutdown();
3346 __nfs4_state_init();
3347 nfs4_unlock_state();
3348}
3349
Linux 6.x block layer and io_uring tree(s)