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[PATCH] knfsd: nfsd4: fix uncomfirmed list
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Globals */
55static time_t lease_time = 90; /* default lease time */
d99a05ad 56static time_t user_lease_time = 90;
fd39ca9a 57static time_t boot_time;
a76b4319 58static int in_grace = 1;
1da177e4
LT		 59static u32 current_clientid = 1;
60static u32 current_ownerid = 1;
61static u32 current_fileid = 1;
62static u32 current_delegid = 1;
63static u32 nfs4_init;
fd39ca9a
N		 64static stateid_t zerostateid; /* bits all 0 */
65static stateid_t onestateid; /* bits all 1 */
66
67#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
68#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 69
1da177e4 70/* forward declarations */
fd39ca9a 71static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 72static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
73static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
74
75/* Locking:
76 *
77 * client_sema:
78 * protects clientid_hashtbl[], clientstr_hashtbl[],
79 * unconfstr_hashtbl[], uncofid_hashtbl[].
80 */
81static DECLARE_MUTEX(client_sema);
82
fd39ca9a
N		 83static kmem_cache_t *stateowner_slab = NULL;
84static kmem_cache_t *file_slab = NULL;
85static kmem_cache_t *stateid_slab = NULL;
86static kmem_cache_t *deleg_slab = NULL;
e60d4398 87
1da177e4
LT		 88void
89nfs4_lock_state(void)
90{
91 down(&client_sema);
92}
93
94void
95nfs4_unlock_state(void)
96{
97 up(&client_sema);
98}
99
100static inline u32
101opaque_hashval(const void *ptr, int nbytes)
102{
103 unsigned char *cptr = (unsigned char *) ptr;
104
105 u32 x = 0;
106 while (nbytes--) {
107 x *= 37;
108 x += *cptr++;
109 }
110 return x;
111}
112
113/* forward declarations */
114static void release_stateowner(struct nfs4_stateowner *sop);
115static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 116
117/*
118 * Delegation state
119 */
120
121/* recall_lock protects the del_recall_lru */
fd39ca9a 122static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static void
126free_nfs4_file(struct kref *kref)
127{
128 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
129 list_del(&fp->fi_hash);
130 iput(fp->fi_inode);
131 kmem_cache_free(file_slab, fp);
132}
133
134static inline void
135put_nfs4_file(struct nfs4_file *fi)
136{
137 kref_put(&fi->fi_ref, free_nfs4_file);
138}
139
140static inline void
141get_nfs4_file(struct nfs4_file *fi)
142{
143 kref_get(&fi->fi_ref);
144}
145
1da177e4
LT		 146static struct nfs4_delegation *
147alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
148{
149 struct nfs4_delegation *dp;
150 struct nfs4_file *fp = stp->st_file;
151 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
152
153 dprintk("NFSD alloc_init_deleg\n");
5b2d21c1
N		 154 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
155 if (dp == NULL)
1da177e4
LT		 156 return dp;
157 INIT_LIST_HEAD(&dp->dl_del_perfile);
158 INIT_LIST_HEAD(&dp->dl_del_perclnt);
159 INIT_LIST_HEAD(&dp->dl_recall_lru);
160 dp->dl_client = clp;
13cd2184 161 get_nfs4_file(fp);
1da177e4
LT		 162 dp->dl_file = fp;
163 dp->dl_flock = NULL;
164 get_file(stp->st_vfs_file);
165 dp->dl_vfs_file = stp->st_vfs_file;
166 dp->dl_type = type;
167 dp->dl_recall.cbr_dp = NULL;
168 dp->dl_recall.cbr_ident = cb->cb_ident;
169 dp->dl_recall.cbr_trunc = 0;
170 dp->dl_stateid.si_boot = boot_time;
171 dp->dl_stateid.si_stateownerid = current_delegid++;
172 dp->dl_stateid.si_fileid = 0;
173 dp->dl_stateid.si_generation = 0;
174 dp->dl_fhlen = current_fh->fh_handle.fh_size;
175 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
176 current_fh->fh_handle.fh_size);
177 dp->dl_time = 0;
178 atomic_set(&dp->dl_count, 1);
8beefa24 179 list_add(&dp->dl_del_perfile, &fp->fi_delegations);
1da177e4 180 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
1da177e4
LT		 181 return dp;
182}
183
184void
185nfs4_put_delegation(struct nfs4_delegation *dp)
186{
187 if (atomic_dec_and_test(&dp->dl_count)) {
188 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 189 put_nfs4_file(dp->dl_file);
5b2d21c1 190 kmem_cache_free(deleg_slab, dp);
1da177e4
LT		 191 }
192}
193
194/* Remove the associated file_lock first, then remove the delegation.
195 * lease_modify() is called to remove the FS_LEASE file_lock from
196 * the i_flock list, eventually calling nfsd's lock_manager
197 * fl_release_callback.
198 */
199static void
200nfs4_close_delegation(struct nfs4_delegation *dp)
201{
202 struct file *filp = dp->dl_vfs_file;
203
204 dprintk("NFSD: close_delegation dp %p\n",dp);
205 dp->dl_vfs_file = NULL;
206 /* The following nfsd_close may not actually close the file,
207 * but we want to remove the lease in any case. */
c907132d
N		 208 if (dp->dl_flock)
209 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 210 nfsd_close(filp);
1da177e4
LT		 211}
212
213/* Called under the state lock. */
214static void
215unhash_delegation(struct nfs4_delegation *dp)
216{
217 list_del_init(&dp->dl_del_perfile);
218 list_del_init(&dp->dl_del_perclnt);
219 spin_lock(&recall_lock);
220 list_del_init(&dp->dl_recall_lru);
221 spin_unlock(&recall_lock);
222 nfs4_close_delegation(dp);
223 nfs4_put_delegation(dp);
224}
225
226/*
227 * SETCLIENTID state
228 */
229
230/* Hash tables for nfs4_clientid state */
231#define CLIENT_HASH_BITS 4
232#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
233#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
234
235#define clientid_hashval(id) \
236 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 237#define clientstr_hashval(name) \
238 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 239/*
240 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
241 * used in reboot/reset lease grace period processing
242 *
243 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
244 * setclientid_confirmed info.
245 *
246 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
247 * setclientid info.
248 *
249 * client_lru holds client queue ordered by nfs4_client.cl_time
250 * for lease renewal.
251 *
252 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
253 * for last close replay.
254 */
255static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
256static int reclaim_str_hashtbl_size = 0;
257static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
258static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
259static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
260static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
261static struct list_head client_lru;
262static struct list_head close_lru;
263
264static inline void
265renew_client(struct nfs4_client *clp)
266{
267 /*
268 * Move client to the end to the LRU list.
269 */
270 dprintk("renewing client (clientid %08x/%08x)\n",
271 clp->cl_clientid.cl_boot,
272 clp->cl_clientid.cl_id);
273 list_move_tail(&clp->cl_lru, &client_lru);
274 clp->cl_time = get_seconds();
275}
276
277/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
278static int
279STALE_CLIENTID(clientid_t *clid)
280{
281 if (clid->cl_boot == boot_time)
282 return 0;
283 dprintk("NFSD stale clientid (%08x/%08x)\n",
284 clid->cl_boot, clid->cl_id);
285 return 1;
286}
287
288/*
289 * XXX Should we use a slab cache ?
290 * This type of memory management is somewhat inefficient, but we use it
291 * anyway since SETCLIENTID is not a common operation.
292 */
293static inline struct nfs4_client *
294alloc_client(struct xdr_netobj name)
295{
296 struct nfs4_client *clp;
297
298 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
299 memset(clp, 0, sizeof(*clp));
300 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
301 memcpy(clp->cl_name.data, name.data, name.len);
302 clp->cl_name.len = name.len;
303 }
304 else {
305 kfree(clp);
306 clp = NULL;
307 }
308 }
309 return clp;
310}
311
312static inline void
313free_client(struct nfs4_client *clp)
314{
315 if (clp->cl_cred.cr_group_info)
316 put_group_info(clp->cl_cred.cr_group_info);
317 kfree(clp->cl_name.data);
318 kfree(clp);
319}
320
321void
322put_nfs4_client(struct nfs4_client *clp)
323{
324 if (atomic_dec_and_test(&clp->cl_count))
325 free_client(clp);
326}
327
328static void
329expire_client(struct nfs4_client *clp)
330{
331 struct nfs4_stateowner *sop;
332 struct nfs4_delegation *dp;
333 struct nfs4_callback *cb = &clp->cl_callback;
334 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
335 struct list_head reaplist;
336
337 dprintk("NFSD: expire_client cl_count %d\n",
338 atomic_read(&clp->cl_count));
339
340 /* shutdown rpc client, ending any outstanding recall rpcs */
341 if (atomic_read(&cb->cb_set) == 1 && clnt) {
342 rpc_shutdown_client(clnt);
343 clnt = clp->cl_callback.cb_client = NULL;
344 }
345
346 INIT_LIST_HEAD(&reaplist);
347 spin_lock(&recall_lock);
348 while (!list_empty(&clp->cl_del_perclnt)) {
349 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
350 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
351 dp->dl_flock);
352 list_del_init(&dp->dl_del_perclnt);
353 list_move(&dp->dl_recall_lru, &reaplist);
354 }
355 spin_unlock(&recall_lock);
356 while (!list_empty(&reaplist)) {
357 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
358 list_del_init(&dp->dl_recall_lru);
359 unhash_delegation(dp);
360 }
361 list_del(&clp->cl_idhash);
362 list_del(&clp->cl_strhash);
363 list_del(&clp->cl_lru);
364 while (!list_empty(&clp->cl_perclient)) {
365 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
366 release_stateowner(sop);
367 }
368 put_nfs4_client(clp);
369}
370
371static struct nfs4_client *
a55370a3 372create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 373 struct nfs4_client *clp;
374
375 if (!(clp = alloc_client(name)))
376 goto out;
a55370a3 377 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 378 atomic_set(&clp->cl_count, 1);
379 atomic_set(&clp->cl_callback.cb_set, 0);
380 clp->cl_callback.cb_parsed = 0;
381 INIT_LIST_HEAD(&clp->cl_idhash);
382 INIT_LIST_HEAD(&clp->cl_strhash);
383 INIT_LIST_HEAD(&clp->cl_perclient);
384 INIT_LIST_HEAD(&clp->cl_del_perclnt);
385 INIT_LIST_HEAD(&clp->cl_lru);
386out:
387 return clp;
388}
389
390static void
391copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
392 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
393}
394
395static void
396copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
397 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
398 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
399}
400
401static void
402copy_cred(struct svc_cred *target, struct svc_cred *source) {
403
404 target->cr_uid = source->cr_uid;
405 target->cr_gid = source->cr_gid;
406 target->cr_group_info = source->cr_group_info;
407 get_group_info(target->cr_group_info);
408}
409
a55370a3
N		 410static inline int
411same_name(const char *n1, const char *n2) {
412 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 413}
414
415static int
416cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
417 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
418}
419
420static int
421cmp_clid(clientid_t * cl1, clientid_t * cl2) {
422 return((cl1->cl_boot == cl2->cl_boot) &&
423 (cl1->cl_id == cl2->cl_id));
424}
425
426/* XXX what about NGROUP */
427static int
428cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
429 return(cr1->cr_uid == cr2->cr_uid);
430
431}
432
433static void
434gen_clid(struct nfs4_client *clp) {
435 clp->cl_clientid.cl_boot = boot_time;
436 clp->cl_clientid.cl_id = current_clientid++;
437}
438
439static void
440gen_confirm(struct nfs4_client *clp) {
441 struct timespec tv;
442 u32 * p;
443
444 tv = CURRENT_TIME;
445 p = (u32 *)clp->cl_confirm.data;
446 *p++ = tv.tv_sec;
447 *p++ = tv.tv_nsec;
448}
449
450static int
451check_name(struct xdr_netobj name) {
452
453 if (name.len == 0)
454 return 0;
455 if (name.len > NFS4_OPAQUE_LIMIT) {
456 printk("NFSD: check_name: name too long(%d)!\n", name.len);
457 return 0;
458 }
459 return 1;
460}
461
fd39ca9a 462static void
1da177e4
LT		 463add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
464{
465 unsigned int idhashval;
466
467 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
468 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
469 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
470 list_add_tail(&clp->cl_lru, &client_lru);
471 clp->cl_time = get_seconds();
472}
473
fd39ca9a 474static void
1da177e4
LT		 475move_to_confirmed(struct nfs4_client *clp)
476{
477 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
478 unsigned int strhashval;
479
480 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
481 list_del_init(&clp->cl_strhash);
482 list_del_init(&clp->cl_idhash);
483 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 484 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 485 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
486 renew_client(clp);
487}
488
489static struct nfs4_client *
490find_confirmed_client(clientid_t *clid)
491{
492 struct nfs4_client *clp;
493 unsigned int idhashval = clientid_hashval(clid->cl_id);
494
495 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
496 if (cmp_clid(&clp->cl_clientid, clid))
497 return clp;
498 }
499 return NULL;
500}
501
502static struct nfs4_client *
503find_unconfirmed_client(clientid_t *clid)
504{
505 struct nfs4_client *clp;
506 unsigned int idhashval = clientid_hashval(clid->cl_id);
507
508 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
509 if (cmp_clid(&clp->cl_clientid, clid))
510 return clp;
511 }
512 return NULL;
513}
514
28ce6054
N		 515static struct nfs4_client *
516find_confirmed_client_by_str(const char *dname, unsigned int hashval)
517{
518 struct nfs4_client *clp;
519
520 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
521 if (same_name(clp->cl_recdir, dname))
522 return clp;
523 }
524 return NULL;
525}
526
527static struct nfs4_client *
528find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
529{
530 struct nfs4_client *clp;
531
532 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
533 if (same_name(clp->cl_recdir, dname))
534 return clp;
535 }
536 return NULL;
537}
538
1da177e4
LT		 539/* a helper function for parse_callback */
540static int
541parse_octet(unsigned int *lenp, char **addrp)
542{
543 unsigned int len = *lenp;
544 char *p = *addrp;
545 int n = -1;
546 char c;
547
548 for (;;) {
549 if (!len)
550 break;
551 len--;
552 c = *p++;
553 if (c == '.')
554 break;
555 if ((c < '0') || (c > '9')) {
556 n = -1;
557 break;
558 }
559 if (n < 0)
560 n = 0;
561 n = (n * 10) + (c - '0');
562 if (n > 255) {
563 n = -1;
564 break;
565 }
566 }
567 *lenp = len;
568 *addrp = p;
569 return n;
570}
571
572/* parse and set the setclientid ipv4 callback address */
fd39ca9a 573static int
1da177e4
LT		 574parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
575{
576 int temp = 0;
577 u32 cbaddr = 0;
578 u16 cbport = 0;
579 u32 addrlen = addr_len;
580 char *addr = addr_val;
581 int i, shift;
582
583 /* ipaddress */
584 shift = 24;
585 for(i = 4; i > 0 ; i--) {
586 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
587 return 0;
588 }
589 cbaddr |= (temp << shift);
590 if (shift > 0)
591 shift -= 8;
592 }
593 *cbaddrp = cbaddr;
594
595 /* port */
596 shift = 8;
597 for(i = 2; i > 0 ; i--) {
598 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
599 return 0;
600 }
601 cbport |= (temp << shift);
602 if (shift > 0)
603 shift -= 8;
604 }
605 *cbportp = cbport;
606 return 1;
607}
608
fd39ca9a 609static void
1da177e4
LT		 610gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
611{
612 struct nfs4_callback *cb = &clp->cl_callback;
613
614 /* Currently, we only support tcp for the callback channel */
615 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
616 goto out_err;
617
618 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
619 &cb->cb_addr, &cb->cb_port)))
620 goto out_err;
621 cb->cb_prog = se->se_callback_prog;
622 cb->cb_ident = se->se_callback_ident;
623 cb->cb_parsed = 1;
624 return;
625out_err:
626 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
627 "will not receive delegations\n",
628 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
629
630 cb->cb_parsed = 0;
631 return;
632}
633
634/*
635 * RFC 3010 has a complex implmentation description of processing a
636 * SETCLIENTID request consisting of 5 bullets, labeled as
637 * CASE0 - CASE4 below.
638 *
639 * NOTES:
640 * callback information will be processed in a future patch
641 *
642 * an unconfirmed record is added when:
643 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644 * CASE 1: confirmed record found with matching name, principal,
645 * verifier, and clientid.
646 * CASE 2: confirmed record found with matching name, principal,
647 * and there is no unconfirmed record with matching
648 * name and principal
649 *
650 * an unconfirmed record is replaced when:
651 * CASE 3: confirmed record found with matching name, principal,
652 * and an unconfirmed record is found with matching
653 * name, principal, and with clientid and
654 * confirm that does not match the confirmed record.
655 * CASE 4: there is no confirmed record with matching name and
656 * principal. there is an unconfirmed record with
657 * matching name, principal.
658 *
659 * an unconfirmed record is deleted when:
660 * CASE 1: an unconfirmed record that matches input name, verifier,
661 * and confirmed clientid.
662 * CASE 4: any unconfirmed records with matching name and principal
663 * that exist after an unconfirmed record has been replaced
664 * as described above.
665 *
666 */
667int
668nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669{
670 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671 struct xdr_netobj clname = {
672 .len = setclid->se_namelen,
673 .data = setclid->se_name,
674 };
675 nfs4_verifier clverifier = setclid->se_verf;
676 unsigned int strhashval;
28ce6054 677 struct nfs4_client *conf, *unconf, *new;
1da177e4 678 int status;
a55370a3 679 char dname[HEXDIR_LEN];
1da177e4
LT		 680
681 status = nfserr_inval;
682 if (!check_name(clname))
683 goto out;
684
a55370a3
N		 685 status = nfs4_make_rec_clidname(dname, &clname);
686 if (status)
687 goto out;
688
1da177e4
LT		 689 /*
690 * XXX The Duplicate Request Cache (DRC) has been checked (??)
691 * We get here on a DRC miss.
692 */
693
a55370a3 694 strhashval = clientstr_hashval(dname);
1da177e4 695
1da177e4 696 nfs4_lock_state();
28ce6054
N		 697 conf = find_confirmed_client_by_str(dname, strhashval);
698 if (conf) {
1da177e4
LT		 699 /*
700 * CASE 0:
701 * clname match, confirmed, different principal
702 * or different ip_address
703 */
704 status = nfserr_clid_inuse;
28ce6054
N		 705 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706 || conf->cl_addr != ip_addr) {
1da177e4
LT		 707 printk("NFSD: setclientid: string in use by client"
708 "(clientid %08x/%08x)\n",
28ce6054 709 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 710 goto out;
711 }
1da177e4 712 }
28ce6054 713 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 714 status = nfserr_resource;
715 if (!conf) {
716 /*
717 * CASE 4:
718 * placed first, because it is the normal case.
719 */
720 if (unconf)
721 expire_client(unconf);
a55370a3
N		 722 new = create_client(clname, dname);
723 if (new == NULL)
1da177e4
LT		 724 goto out;
725 copy_verf(new, &clverifier);
726 new->cl_addr = ip_addr;
727 copy_cred(&new->cl_cred,&rqstp->rq_cred);
728 gen_clid(new);
729 gen_confirm(new);
730 gen_callback(new, setclid);
731 add_to_unconfirmed(new, strhashval);
732 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
733 /*
734 * CASE 1:
735 * cl_name match, confirmed, principal match
736 * verifier match: probable callback update
737 *
738 * remove any unconfirmed nfs4_client with
739 * matching cl_name, cl_verifier, and cl_clientid
740 *
741 * create and insert an unconfirmed nfs4_client with same
742 * cl_name, cl_verifier, and cl_clientid as existing
743 * nfs4_client, but with the new callback info and a
744 * new cl_confirm
745 */
31f4a6c1
N		 746 if (unconf) {
747 /* Note this is removing unconfirmed {*x***},
748 * which is stronger than RFC recommended {vxc**}.
749 * This has the advantage that there is at most
750 * one {*x***} in either list at any time.
751 */
752 expire_client(unconf);
1da177e4 753 }
a55370a3
N		 754 new = create_client(clname, dname);
755 if (new == NULL)
1da177e4
LT		 756 goto out;
757 copy_verf(new,&conf->cl_verifier);
758 new->cl_addr = ip_addr;
759 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760 copy_clid(new, conf);
761 gen_confirm(new);
762 gen_callback(new, setclid);
763 add_to_unconfirmed(new,strhashval);
764 } else if (!unconf) {
765 /*
766 * CASE 2:
767 * clname match, confirmed, principal match
768 * verfier does not match
769 * no unconfirmed. create a new unconfirmed nfs4_client
770 * using input clverifier, clname, and callback info
771 * and generate a new cl_clientid and cl_confirm.
772 */
a55370a3
N		 773 new = create_client(clname, dname);
774 if (new == NULL)
1da177e4
LT		 775 goto out;
776 copy_verf(new,&clverifier);
777 new->cl_addr = ip_addr;
778 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779 gen_clid(new);
780 gen_confirm(new);
781 gen_callback(new, setclid);
782 add_to_unconfirmed(new, strhashval);
783 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
784 /*
785 * CASE3:
786 * confirmed found (name, principal match)
787 * confirmed verifier does not match input clverifier
788 *
789 * unconfirmed found (name match)
790 * confirmed->cl_confirm != unconfirmed->cl_confirm
791 *
792 * remove unconfirmed.
793 *
794 * create an unconfirmed nfs4_client
795 * with same cl_name as existing confirmed nfs4_client,
796 * but with new callback info, new cl_clientid,
797 * new cl_verifier and a new cl_confirm
798 */
799 expire_client(unconf);
a55370a3
N		 800 new = create_client(clname, dname);
801 if (new == NULL)
1da177e4
LT		 802 goto out;
803 copy_verf(new,&clverifier);
804 new->cl_addr = ip_addr;
805 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806 gen_clid(new);
807 gen_confirm(new);
808 gen_callback(new, setclid);
809 add_to_unconfirmed(new, strhashval);
810 } else {
811 /* No cases hit !!! */
812 status = nfserr_inval;
813 goto out;
814
815 }
816 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
817 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
818 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
819 status = nfs_ok;
820out:
821 nfs4_unlock_state();
822 return status;
823}
824
825
826/*
827 * RFC 3010 has a complex implmentation description of processing a
828 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
829 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
830 *
831 * NOTE: callback information will be processed here in a future patch
832 */
833int
834nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
835{
836 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
837 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
838 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
839 clientid_t * clid = &setclientid_confirm->sc_clientid;
840 int status;
841
842 if (STALE_CLIENTID(clid))
843 return nfserr_stale_clientid;
844 /*
845 * XXX The Duplicate Request Cache (DRC) has been checked (??)
846 * We get here on a DRC miss.
847 */
848
849 nfs4_lock_state();
850 clp = find_confirmed_client(clid);
851 if (clp) {
852 status = nfserr_inval;
853 /*
854 * Found a record for this clientid. If the IP addresses
855 * don't match, return ERR_INVAL just as if the record had
856 * not been found.
857 */
858 if (clp->cl_addr != ip_addr) {
859 printk("NFSD: setclientid: string in use by client"
860 "(clientid %08x/%08x)\n",
861 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
862 goto out;
863 }
864 conf = clp;
865 }
866 clp = find_unconfirmed_client(clid);
867 if (clp) {
868 status = nfserr_inval;
869 if (clp->cl_addr != ip_addr) {
870 printk("NFSD: setclientid: string in use by client"
871 "(clientid %08x/%08x)\n",
872 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
873 goto out;
874 }
875 unconf = clp;
876 }
877 /* CASE 1:
878 * unconf record that matches input clientid and input confirm.
879 * conf record that matches input clientid.
880 * conf and unconf records match names, verifiers
881 */
882 if ((conf && unconf) &&
883 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
884 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 885 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4
LT		 886 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
887 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
888 status = nfserr_clid_inuse;
889 else {
890 expire_client(conf);
891 clp = unconf;
892 move_to_confirmed(unconf);
893 status = nfs_ok;
894 }
895 goto out;
896 }
897 /* CASE 2:
898 * conf record that matches input clientid.
899 * if unconf record that matches input clientid, then unconf->cl_name
900 * or unconf->cl_verifier don't match the conf record.
901 */
902 if ((conf && !unconf) ||
903 ((conf && unconf) &&
904 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 905 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
1da177e4
LT		 906 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
907 status = nfserr_clid_inuse;
908 } else {
909 clp = conf;
910 status = nfs_ok;
911 }
912 goto out;
913 }
914 /* CASE 3:
915 * conf record not found.
916 * unconf record found.
917 * unconf->cl_confirm matches input confirm
918 */
919 if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
920 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
921 status = nfserr_clid_inuse;
922 } else {
923 status = nfs_ok;
924 clp = unconf;
925 move_to_confirmed(unconf);
926 }
927 goto out;
928 }
929 /* CASE 4:
930 * conf record not found, or if conf, then conf->cl_confirm does not
931 * match input confirm.
932 * unconf record not found, or if unconf, then unconf->cl_confirm
933 * does not match input confirm.
934 */
935 if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
936 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
937 status = nfserr_stale_clientid;
938 goto out;
939 }
940 /* check that we have hit one of the cases...*/
941 status = nfserr_inval;
942 goto out;
943out:
944 if (!status)
945 nfsd4_probe_callback(clp);
946 nfs4_unlock_state();
947 return status;
948}
949
950/*
951 * Open owner state (share locks)
952 */
953
954/* hash tables for nfs4_stateowner */
955#define OWNER_HASH_BITS 8
956#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
957#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
958
959#define ownerid_hashval(id) \
960 ((id) & OWNER_HASH_MASK)
961#define ownerstr_hashval(clientid, ownername) \
962 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
963
964static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
965static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
966
967/* hash table for nfs4_file */
968#define FILE_HASH_BITS 8
969#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
970#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
971/* hash table for (open)nfs4_stateid */
972#define STATEID_HASH_BITS 10
973#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
974#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
975
976#define file_hashval(x) \
977 hash_ptr(x, FILE_HASH_BITS)
978#define stateid_hashval(owner_id, file_id) \
979 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
980
981static struct list_head file_hashtbl[FILE_HASH_SIZE];
982static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
983
984/* OPEN Share state helper functions */
985static inline struct nfs4_file *
986alloc_init_file(struct inode *ino)
987{
988 struct nfs4_file *fp;
989 unsigned int hashval = file_hashval(ino);
990
e60d4398
N		 991 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
992 if (fp) {
13cd2184 993 kref_init(&fp->fi_ref);
1da177e4 994 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 995 INIT_LIST_HEAD(&fp->fi_stateids);
996 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 997 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
998 fp->fi_inode = igrab(ino);
999 fp->fi_id = current_fileid++;
1da177e4
LT		 1000 return fp;
1001 }
1002 return NULL;
1003}
1004
e60d4398
N		 1005static void
1006nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 1007{
e60d4398
N		 1008 int status;
1009
1010 if (*slab == NULL)
1011 return;
1012 status = kmem_cache_destroy(*slab);
1013 *slab = NULL;
1014 WARN_ON(status);
1da177e4
LT		 1015}
1016
1017static void
1018nfsd4_free_slabs(void)
1019{
e60d4398
N		 1020 nfsd4_free_slab(&stateowner_slab);
1021 nfsd4_free_slab(&file_slab);
5ac049ac 1022 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1023 nfsd4_free_slab(&deleg_slab);
e60d4398 1024}
1da177e4 1025
e60d4398
N		 1026static int
1027nfsd4_init_slabs(void)
1028{
1029 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1030 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1031 if (stateowner_slab == NULL)
1032 goto out_nomem;
1033 file_slab = kmem_cache_create("nfsd4_files",
1034 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1035 if (file_slab == NULL)
1036 goto out_nomem;
5ac049ac
N		 1037 stateid_slab = kmem_cache_create("nfsd4_stateids",
1038 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1039 if (stateid_slab == NULL)
1040 goto out_nomem;
5b2d21c1
N		 1041 deleg_slab = kmem_cache_create("nfsd4_delegations",
1042 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1043 if (deleg_slab == NULL)
1044 goto out_nomem;
e60d4398
N		 1045 return 0;
1046out_nomem:
1047 nfsd4_free_slabs();
1048 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1049 return -ENOMEM;
1da177e4
LT		 1050}
1051
1052void
1053nfs4_free_stateowner(struct kref *kref)
1054{
1055 struct nfs4_stateowner *sop =
1056 container_of(kref, struct nfs4_stateowner, so_ref);
1057 kfree(sop->so_owner.data);
1058 kmem_cache_free(stateowner_slab, sop);
1059}
1060
1061static inline struct nfs4_stateowner *
1062alloc_stateowner(struct xdr_netobj *owner)
1063{
1064 struct nfs4_stateowner *sop;
1065
1066 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1067 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1068 memcpy(sop->so_owner.data, owner->data, owner->len);
1069 sop->so_owner.len = owner->len;
1070 kref_init(&sop->so_ref);
1071 return sop;
1072 }
1073 kmem_cache_free(stateowner_slab, sop);
1074 }
1075 return NULL;
1076}
1077
1078static struct nfs4_stateowner *
1079alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1080 struct nfs4_stateowner *sop;
1081 struct nfs4_replay *rp;
1082 unsigned int idhashval;
1083
1084 if (!(sop = alloc_stateowner(&open->op_owner)))
1085 return NULL;
1086 idhashval = ownerid_hashval(current_ownerid);
1087 INIT_LIST_HEAD(&sop->so_idhash);
1088 INIT_LIST_HEAD(&sop->so_strhash);
1089 INIT_LIST_HEAD(&sop->so_perclient);
1090 INIT_LIST_HEAD(&sop->so_perfilestate);
1091 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1092 INIT_LIST_HEAD(&sop->so_close_lru);
1093 sop->so_time = 0;
1094 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1095 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1096 list_add(&sop->so_perclient, &clp->cl_perclient);
1da177e4
LT		 1097 sop->so_is_open_owner = 1;
1098 sop->so_id = current_ownerid++;
1099 sop->so_client = clp;
1100 sop->so_seqid = open->op_seqid;
1101 sop->so_confirmed = 0;
1102 rp = &sop->so_replay;
1103 rp->rp_status = NFSERR_SERVERFAULT;
1104 rp->rp_buflen = 0;
1105 rp->rp_buf = rp->rp_ibuf;
1106 return sop;
1107}
1108
1109static void
1110release_stateid_lockowners(struct nfs4_stateid *open_stp)
1111{
1112 struct nfs4_stateowner *lock_sop;
1113
1114 while (!list_empty(&open_stp->st_perlockowner)) {
1115 lock_sop = list_entry(open_stp->st_perlockowner.next,
1116 struct nfs4_stateowner, so_perlockowner);
1117 /* list_del(&open_stp->st_perlockowner); */
1118 BUG_ON(lock_sop->so_is_open_owner);
1119 release_stateowner(lock_sop);
1120 }
1121}
1122
1123static void
1124unhash_stateowner(struct nfs4_stateowner *sop)
1125{
1126 struct nfs4_stateid *stp;
1127
1128 list_del(&sop->so_idhash);
1129 list_del(&sop->so_strhash);
6fa305de 1130 if (sop->so_is_open_owner)
1da177e4 1131 list_del(&sop->so_perclient);
1da177e4
LT		 1132 list_del(&sop->so_perlockowner);
1133 while (!list_empty(&sop->so_perfilestate)) {
1134 stp = list_entry(sop->so_perfilestate.next,
1135 struct nfs4_stateid, st_perfilestate);
1136 if (sop->so_is_open_owner)
1137 release_stateid(stp, OPEN_STATE);
1138 else
1139 release_stateid(stp, LOCK_STATE);
1140 }
1141}
1142
1143static void
1144release_stateowner(struct nfs4_stateowner *sop)
1145{
1146 unhash_stateowner(sop);
1147 list_del(&sop->so_close_lru);
1148 nfs4_put_stateowner(sop);
1149}
1150
1151static inline void
1152init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1153 struct nfs4_stateowner *sop = open->op_stateowner;
1154 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1155
1156 INIT_LIST_HEAD(&stp->st_hash);
1157 INIT_LIST_HEAD(&stp->st_perfilestate);
1158 INIT_LIST_HEAD(&stp->st_perlockowner);
1159 INIT_LIST_HEAD(&stp->st_perfile);
1160 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1161 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
8beefa24 1162 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1163 stp->st_stateowner = sop;
13cd2184 1164 get_nfs4_file(fp);
1da177e4
LT		 1165 stp->st_file = fp;
1166 stp->st_stateid.si_boot = boot_time;
1167 stp->st_stateid.si_stateownerid = sop->so_id;
1168 stp->st_stateid.si_fileid = fp->fi_id;
1169 stp->st_stateid.si_generation = 0;
1170 stp->st_access_bmap = 0;
1171 stp->st_deny_bmap = 0;
1172 __set_bit(open->op_share_access, &stp->st_access_bmap);
1173 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1174}
1175
1176static void
1177release_stateid(struct nfs4_stateid *stp, int flags)
1178{
1179 struct file *filp = stp->st_vfs_file;
1180
1181 list_del(&stp->st_hash);
1da177e4
LT		 1182 list_del(&stp->st_perfile);
1183 list_del(&stp->st_perfilestate);
1184 if (flags & OPEN_STATE) {
1185 release_stateid_lockowners(stp);
1186 stp->st_vfs_file = NULL;
1187 nfsd_close(filp);
1da177e4
LT		 1188 } else if (flags & LOCK_STATE)
1189 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1190 put_nfs4_file(stp->st_file);
5ac049ac 1191 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1192 stp = NULL;
1193}
1194
fd39ca9a 1195static void
1da177e4
LT		 1196move_to_close_lru(struct nfs4_stateowner *sop)
1197{
1198 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1199
1200 unhash_stateowner(sop);
1201 list_add_tail(&sop->so_close_lru, &close_lru);
1202 sop->so_time = get_seconds();
1203}
1204
fd39ca9a 1205static void
1da177e4
LT		 1206release_state_owner(struct nfs4_stateid *stp, int flag)
1207{
1208 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1209
1210 dprintk("NFSD: release_state_owner\n");
1211 release_stateid(stp, flag);
1212
1213 /* place unused nfs4_stateowners on so_close_lru list to be
1214 * released by the laundromat service after the lease period
1215 * to enable us to handle CLOSE replay
1216 */
1217 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1218 move_to_close_lru(sop);
1da177e4
LT		 1219}
1220
1221static int
1222cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1223 return ((sop->so_owner.len == owner->len) &&
1224 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1225 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1226}
1227
1228static struct nfs4_stateowner *
1229find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1230{
1231 struct nfs4_stateowner *so = NULL;
1232
1233 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1234 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1235 return so;
1236 }
1237 return NULL;
1238}
1239
1240/* search file_hashtbl[] for file */
1241static struct nfs4_file *
1242find_file(struct inode *ino)
1243{
1244 unsigned int hashval = file_hashval(ino);
1245 struct nfs4_file *fp;
1246
1247 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1248 if (fp->fi_inode == ino) {
1249 get_nfs4_file(fp);
1da177e4 1250 return fp;
13cd2184 1251 }
1da177e4
LT		 1252 }
1253 return NULL;
1254}
1255
1256#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1257#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1258
fd39ca9a 1259static void
1da177e4
LT		 1260set_access(unsigned int *access, unsigned long bmap) {
1261 int i;
1262
1263 *access = 0;
1264 for (i = 1; i < 4; i++) {
1265 if (test_bit(i, &bmap))
1266 *access |= i;
1267 }
1268}
1269
fd39ca9a 1270static void
1da177e4
LT		 1271set_deny(unsigned int *deny, unsigned long bmap) {
1272 int i;
1273
1274 *deny = 0;
1275 for (i = 0; i < 4; i++) {
1276 if (test_bit(i, &bmap))
1277 *deny |= i ;
1278 }
1279}
1280
1281static int
1282test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1283 unsigned int access, deny;
1284
1285 set_access(&access, stp->st_access_bmap);
1286 set_deny(&deny, stp->st_deny_bmap);
1287 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1288 return 0;
1289 return 1;
1290}
1291
1292/*
1293 * Called to check deny when READ with all zero stateid or
1294 * WRITE with all zero or all one stateid
1295 */
fd39ca9a 1296static int
1da177e4
LT		 1297nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1298{
1299 struct inode *ino = current_fh->fh_dentry->d_inode;
1300 struct nfs4_file *fp;
1301 struct nfs4_stateid *stp;
13cd2184 1302 int ret;
1da177e4
LT		 1303
1304 dprintk("NFSD: nfs4_share_conflict\n");
1305
1306 fp = find_file(ino);
13cd2184
N		 1307 if (!fp)
1308 return nfs_ok;
1309 ret = nfserr_share_denied;
1da177e4 1310 /* Search for conflicting share reservations */
13cd2184
N		 1311 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1312 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1313 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1314 goto out;
1da177e4 1315 }
13cd2184
N		 1316 ret = nfs_ok;
1317out:
1318 put_nfs4_file(fp);
1319 return ret;
1da177e4
LT		 1320}
1321
1322static inline void
1323nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1324{
1325 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1326 put_write_access(filp->f_dentry->d_inode);
1327 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1328 }
1329}
1330
1331/*
1332 * Recall a delegation
1333 */
1334static int
1335do_recall(void *__dp)
1336{
1337 struct nfs4_delegation *dp = __dp;
1338
1339 daemonize("nfsv4-recall");
1340
1341 nfsd4_cb_recall(dp);
1342 return 0;
1343}
1344
1345/*
1346 * Spawn a thread to perform a recall on the delegation represented
1347 * by the lease (file_lock)
1348 *
1349 * Called from break_lease() with lock_kernel() held.
1350 * Note: we assume break_lease will only call this *once* for any given
1351 * lease.
1352 */
1353static
1354void nfsd_break_deleg_cb(struct file_lock *fl)
1355{
1356 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1357 struct task_struct *t;
1358
1359 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1360 if (!dp)
1361 return;
1362
1363 /* We're assuming the state code never drops its reference
1364 * without first removing the lease. Since we're in this lease
1365 * callback (and since the lease code is serialized by the kernel
1366 * lock) we know the server hasn't removed the lease yet, we know
1367 * it's safe to take a reference: */
1368 atomic_inc(&dp->dl_count);
1369
1370 spin_lock(&recall_lock);
1371 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1372 spin_unlock(&recall_lock);
1373
1374 /* only place dl_time is set. protected by lock_kernel*/
1375 dp->dl_time = get_seconds();
1376
1377 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1378 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1379
1380 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1381 if (IS_ERR(t)) {
1382 struct nfs4_client *clp = dp->dl_client;
1383
1384 printk(KERN_INFO "NFSD: Callback thread failed for "
1385 "for client (clientid %08x/%08x)\n",
1386 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1387 nfs4_put_delegation(dp);
1388 }
1389}
1390
1391/*
1392 * The file_lock is being reapd.
1393 *
1394 * Called by locks_free_lock() with lock_kernel() held.
1395 */
1396static
1397void nfsd_release_deleg_cb(struct file_lock *fl)
1398{
1399 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1400
1401 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1402
1403 if (!(fl->fl_flags & FL_LEASE) || !dp)
1404 return;
1405 dp->dl_flock = NULL;
1406}
1407
1408/*
1409 * Set the delegation file_lock back pointer.
1410 *
1411 * Called from __setlease() with lock_kernel() held.
1412 */
1413static
1414void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1415{
1416 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1417
1418 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1419 if (!dp)
1420 return;
1421 dp->dl_flock = new;
1422}
1423
1424/*
1425 * Called from __setlease() with lock_kernel() held
1426 */
1427static
1428int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1429{
1430 struct nfs4_delegation *onlistd =
1431 (struct nfs4_delegation *)onlist->fl_owner;
1432 struct nfs4_delegation *tryd =
1433 (struct nfs4_delegation *)try->fl_owner;
1434
1435 if (onlist->fl_lmops != try->fl_lmops)
1436 return 0;
1437
1438 return onlistd->dl_client == tryd->dl_client;
1439}
1440
1441
1442static
1443int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1444{
1445 if (arg & F_UNLCK)
1446 return lease_modify(onlist, arg);
1447 else
1448 return -EAGAIN;
1449}
1450
fd39ca9a 1451static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1452 .fl_break = nfsd_break_deleg_cb,
1453 .fl_release_private = nfsd_release_deleg_cb,
1454 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1455 .fl_mylease = nfsd_same_client_deleg_cb,
1456 .fl_change = nfsd_change_deleg_cb,
1457};
1458
1459
1460/*
1461 * nfsd4_process_open1()
1462 * lookup stateowner.
1463 * found:
1464 * check confirmed
1465 * confirmed:
1466 * check seqid
1467 * not confirmed:
1468 * delete owner
1469 * create new owner
1470 * notfound:
1471 * verify clientid
1472 * create new owner
1473 *
1474 * called with nfs4_lock_state() held.
1475 */
1476int
1477nfsd4_process_open1(struct nfsd4_open *open)
1478{
1479 int status;
1480 clientid_t *clientid = &open->op_clientid;
1481 struct nfs4_client *clp = NULL;
1482 unsigned int strhashval;
1483 struct nfs4_stateowner *sop = NULL;
1484
1485 status = nfserr_inval;
1486 if (!check_name(open->op_owner))
1487 goto out;
1488
1489 if (STALE_CLIENTID(&open->op_clientid))
1490 return nfserr_stale_clientid;
1491
1492 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1493 sop = find_openstateowner_str(strhashval, open);
1494 if (sop) {
1495 open->op_stateowner = sop;
1496 /* check for replay */
1497 if (open->op_seqid == sop->so_seqid){
1498 if (sop->so_replay.rp_buflen)
1499 return NFSERR_REPLAY_ME;
1500 else {
1501 /* The original OPEN failed so spectacularly
1502 * that we don't even have replay data saved!
1503 * Therefore, we have no choice but to continue
1504 * processing this OPEN; presumably, we'll
1505 * fail again for the same reason.
1506 */
1507 dprintk("nfsd4_process_open1:"
1508 " replay with no replay cache\n");
1509 goto renew;
1510 }
1511 } else if (sop->so_confirmed) {
1512 if (open->op_seqid == sop->so_seqid + 1)
1513 goto renew;
1514 status = nfserr_bad_seqid;
1515 goto out;
1516 } else {
1517 /* If we get here, we received an OPEN for an
1518 * unconfirmed nfs4_stateowner. Since the seqid's are
1519 * different, purge the existing nfs4_stateowner, and
1520 * instantiate a new one.
1521 */
1522 clp = sop->so_client;
1523 release_stateowner(sop);
1524 }
1525 } else {
1526 /* nfs4_stateowner not found.
1527 * Verify clientid and instantiate new nfs4_stateowner.
1528 * If verify fails this is presumably the result of the
1529 * client's lease expiring.
1530 */
1531 status = nfserr_expired;
1532 clp = find_confirmed_client(clientid);
1533 if (clp == NULL)
1534 goto out;
1535 }
1536 status = nfserr_resource;
1537 sop = alloc_init_open_stateowner(strhashval, clp, open);
1538 if (sop == NULL)
1539 goto out;
1540 open->op_stateowner = sop;
1541renew:
1542 status = nfs_ok;
1543 renew_client(sop->so_client);
1544out:
1545 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1546 status = nfserr_reclaim_bad;
1547 return status;
1548}
1549
4a6e43e6
N		 1550static inline int
1551nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1552{
1553 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1554 return nfserr_openmode;
1555 else
1556 return nfs_ok;
1557}
1558
52f4fb43
N		 1559static struct nfs4_delegation *
1560find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1561{
1562 struct nfs4_delegation *dp;
1563
8beefa24 1564 list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
52f4fb43
N		 1565 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1566 return dp;
1567 }
1568 return NULL;
1569}
1570
c44c5eeb 1571static int
567d9829
N		 1572nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1573 struct nfs4_delegation **dp)
1574{
1575 int flags;
c44c5eeb 1576 int status = nfserr_bad_stateid;
567d9829
N		 1577
1578 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1579 if (*dp == NULL)
c44c5eeb 1580 goto out;
567d9829
N		 1581 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1582 RD_STATE : WR_STATE;
1583 status = nfs4_check_delegmode(*dp, flags);
1584 if (status)
1585 *dp = NULL;
c44c5eeb
N		 1586out:
1587 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1588 return nfs_ok;
1589 if (status)
1590 return status;
1591 open->op_stateowner->so_confirmed = 1;
1592 return nfs_ok;
567d9829
N		 1593}
1594
1da177e4
LT		 1595static int
1596nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1597{
1598 struct nfs4_stateid *local;
1599 int status = nfserr_share_denied;
1600 struct nfs4_stateowner *sop = open->op_stateowner;
1601
8beefa24 1602 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1603 /* ignore lock owners */
1604 if (local->st_stateowner->so_is_open_owner == 0)
1605 continue;
1606 /* remember if we have seen this open owner */
1607 if (local->st_stateowner == sop)
1608 *stpp = local;
1609 /* check for conflicting share reservations */
1610 if (!test_share(local, open))
1611 goto out;
1612 }
1613 status = 0;
1614out:
1615 return status;
1616}
1617
5ac049ac
N		 1618static inline struct nfs4_stateid *
1619nfs4_alloc_stateid(void)
1620{
1621 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1622}
1623
1da177e4
LT		 1624static int
1625nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1626 struct nfs4_delegation *dp,
1da177e4
LT		 1627 struct svc_fh *cur_fh, int flags)
1628{
1629 struct nfs4_stateid *stp;
1da177e4 1630
5ac049ac 1631 stp = nfs4_alloc_stateid();
1da177e4
LT		 1632 if (stp == NULL)
1633 return nfserr_resource;
1634
567d9829
N		 1635 if (dp) {
1636 get_file(dp->dl_vfs_file);
1637 stp->st_vfs_file = dp->dl_vfs_file;
1638 } else {
1639 int status;
1640 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1641 &stp->st_vfs_file);
1642 if (status) {
1643 if (status == nfserr_dropit)
1644 status = nfserr_jukebox;
5ac049ac 1645 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1646 return status;
1647 }
1da177e4 1648 }
1da177e4
LT		 1649 *stpp = stp;
1650 return 0;
1651}
1652
1653static inline int
1654nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1655 struct nfsd4_open *open)
1656{
1657 struct iattr iattr = {
1658 .ia_valid = ATTR_SIZE,
1659 .ia_size = 0,
1660 };
1661 if (!open->op_truncate)
1662 return 0;
1663 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1664 return -EINVAL;
1665 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1666}
1667
1668static int
1669nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1670{
1671 struct file *filp = stp->st_vfs_file;
1672 struct inode *inode = filp->f_dentry->d_inode;
1673 unsigned int share_access;
1674 int status;
1675
1676 set_access(&share_access, stp->st_access_bmap);
1677 share_access = ~share_access;
1678 share_access &= open->op_share_access;
1679
1680 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1681 return nfsd4_truncate(rqstp, cur_fh, open);
1682
1683 status = get_write_access(inode);
1684 if (status)
1685 return nfserrno(status);
1686 status = nfsd4_truncate(rqstp, cur_fh, open);
1687 if (status) {
1688 put_write_access(inode);
1689 return status;
1690 }
1691 /* remember the open */
1692 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1693 set_bit(open->op_share_access, &stp->st_access_bmap);
1694 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1695
1696 return nfs_ok;
1697}
1698
1699
1700/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1701static void
1702nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1703{
1704 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1705 if (*status)
1706 *status = nfserr_reclaim_bad;
1707 else {
1708 open->op_stateowner->so_confirmed = 1;
1709 open->op_stateowner->so_seqid--;
1710 }
1711 }
1712}
1713
1714/*
1715 * Attempt to hand out a delegation.
1716 */
1717static void
1718nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1719{
1720 struct nfs4_delegation *dp;
1721 struct nfs4_stateowner *sop = stp->st_stateowner;
1722 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1723 struct file_lock fl, *flp = &fl;
1724 int status, flag = 0;
1725
1726 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1727 open->op_recall = 0;
1728 switch (open->op_claim_type) {
1729 case NFS4_OPEN_CLAIM_PREVIOUS:
1730 if (!atomic_read(&cb->cb_set))
1731 open->op_recall = 1;
1732 flag = open->op_delegate_type;
1733 if (flag == NFS4_OPEN_DELEGATE_NONE)
1734 goto out;
1735 break;
1736 case NFS4_OPEN_CLAIM_NULL:
1737 /* Let's not give out any delegations till everyone's
1738 * had the chance to reclaim theirs.... */
1739 if (nfs4_in_grace())
1740 goto out;
1741 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1742 goto out;
1743 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1744 flag = NFS4_OPEN_DELEGATE_WRITE;
1745 else
1746 flag = NFS4_OPEN_DELEGATE_READ;
1747 break;
1748 default:
1749 goto out;
1750 }
1da177e4
LT		 1751
1752 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1753 if (dp == NULL) {
1754 flag = NFS4_OPEN_DELEGATE_NONE;
1755 goto out;
1756 }
1757 locks_init_lock(&fl);
1758 fl.fl_lmops = &nfsd_lease_mng_ops;
1759 fl.fl_flags = FL_LEASE;
1760 fl.fl_end = OFFSET_MAX;
1761 fl.fl_owner = (fl_owner_t)dp;
1762 fl.fl_file = stp->st_vfs_file;
1763 fl.fl_pid = current->tgid;
1764
1765 /* setlease checks to see if delegation should be handed out.
1766 * the lock_manager callbacks fl_mylease and fl_change are used
1767 */
1768 if ((status = setlease(stp->st_vfs_file,
1769 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1770 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1771 unhash_delegation(dp);
1da177e4
LT		 1772 flag = NFS4_OPEN_DELEGATE_NONE;
1773 goto out;
1774 }
1775
1776 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1777
1778 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1779 dp->dl_stateid.si_boot,
1780 dp->dl_stateid.si_stateownerid,
1781 dp->dl_stateid.si_fileid,
1782 dp->dl_stateid.si_generation);
1783out:
7b190fec
N		 1784 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1785 && flag == NFS4_OPEN_DELEGATE_NONE
1786 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1787 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1788 open->op_delegate_type = flag;
1789}
1790
1791/*
1792 * called with nfs4_lock_state() held.
1793 */
1794int
1795nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1796{
1797 struct nfs4_file *fp = NULL;
1798 struct inode *ino = current_fh->fh_dentry->d_inode;
1799 struct nfs4_stateid *stp = NULL;
567d9829 1800 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1801 int status;
1802
1803 status = nfserr_inval;
1804 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1805 goto out;
1806 /*
1807 * Lookup file; if found, lookup stateid and check open request,
1808 * and check for delegations in the process of being recalled.
1809 * If not found, create the nfs4_file struct
1810 */
1811 fp = find_file(ino);
1812 if (fp) {
1813 if ((status = nfs4_check_open(fp, open, &stp)))
1814 goto out;
c44c5eeb
N		 1815 status = nfs4_check_deleg(fp, open, &dp);
1816 if (status)
1817 goto out;
1da177e4 1818 } else {
c44c5eeb
N		 1819 status = nfserr_bad_stateid;
1820 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1821 goto out;
1da177e4
LT		 1822 status = nfserr_resource;
1823 fp = alloc_init_file(ino);
1824 if (fp == NULL)
1825 goto out;
1826 }
1827
1828 /*
1829 * OPEN the file, or upgrade an existing OPEN.
1830 * If truncate fails, the OPEN fails.
1831 */
1832 if (stp) {
1833 /* Stateid was found, this is an OPEN upgrade */
1834 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1835 if (status)
1836 goto out;
1837 } else {
1838 /* Stateid was not found, this is a new OPEN */
1839 int flags = 0;
1840 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1841 flags = MAY_WRITE;
1842 else
1843 flags = MAY_READ;
567d9829
N		 1844 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1845 if (status)
1da177e4
LT		 1846 goto out;
1847 init_stateid(stp, fp, open);
1848 status = nfsd4_truncate(rqstp, current_fh, open);
1849 if (status) {
1850 release_stateid(stp, OPEN_STATE);
1851 goto out;
1852 }
1853 }
1854 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1855
1856 /*
1857 * Attempt to hand out a delegation. No error return, because the
1858 * OPEN succeeds even if we fail.
1859 */
1860 nfs4_open_delegation(current_fh, open, stp);
1861
1862 status = nfs_ok;
1863
1864 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1865 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1866 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1867out:
13cd2184
N		 1868 if (fp)
1869 put_nfs4_file(fp);
1da177e4
LT		 1870 /* CLAIM_PREVIOUS has different error returns */
1871 nfs4_set_claim_prev(open, &status);
1872 /*
1873 * To finish the open response, we just need to set the rflags.
1874 */
1875 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1876 if (!open->op_stateowner->so_confirmed)
1877 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1878
1879 return status;
1880}
1881
58da282b 1882static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1883static struct work_struct laundromat_work;
1884static void laundromat_main(void *);
1885static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1886
1887int
1888nfsd4_renew(clientid_t *clid)
1889{
1890 struct nfs4_client *clp;
1891 int status;
1892
1893 nfs4_lock_state();
1894 dprintk("process_renew(%08x/%08x): starting\n",
1895 clid->cl_boot, clid->cl_id);
1896 status = nfserr_stale_clientid;
1897 if (STALE_CLIENTID(clid))
1898 goto out;
1899 clp = find_confirmed_client(clid);
1900 status = nfserr_expired;
1901 if (clp == NULL) {
1902 /* We assume the client took too long to RENEW. */
1903 dprintk("nfsd4_renew: clientid not found!\n");
1904 goto out;
1905 }
1906 renew_client(clp);
1907 status = nfserr_cb_path_down;
1908 if (!list_empty(&clp->cl_del_perclnt)
1909 && !atomic_read(&clp->cl_callback.cb_set))
1910 goto out;
1911 status = nfs_ok;
1912out:
1913 nfs4_unlock_state();
1914 return status;
1915}
1916
a76b4319
N		 1917static void
1918end_grace(void)
1919{
1920 dprintk("NFSD: end of grace period\n");
1921 in_grace = 0;
1922}
1923
fd39ca9a 1924static time_t
1da177e4
LT		 1925nfs4_laundromat(void)
1926{
1927 struct nfs4_client *clp;
1928 struct nfs4_stateowner *sop;
1929 struct nfs4_delegation *dp;
1930 struct list_head *pos, *next, reaplist;
1931 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1932 time_t t, clientid_val = NFSD_LEASE_TIME;
1933 time_t u, test_val = NFSD_LEASE_TIME;
1934
1935 nfs4_lock_state();
1936
1937 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1938 if (in_grace)
1939 end_grace();
1da177e4
LT		 1940 list_for_each_safe(pos, next, &client_lru) {
1941 clp = list_entry(pos, struct nfs4_client, cl_lru);
1942 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1943 t = clp->cl_time - cutoff;
1944 if (clientid_val > t)
1945 clientid_val = t;
1946 break;
1947 }
1948 dprintk("NFSD: purging unused client (clientid %08x)\n",
1949 clp->cl_clientid.cl_id);
1950 expire_client(clp);
1951 }
1952 INIT_LIST_HEAD(&reaplist);
1953 spin_lock(&recall_lock);
1954 list_for_each_safe(pos, next, &del_recall_lru) {
1955 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1956 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1957 u = dp->dl_time - cutoff;
1958 if (test_val > u)
1959 test_val = u;
1960 break;
1961 }
1962 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1963 dp, dp->dl_flock);
1964 list_move(&dp->dl_recall_lru, &reaplist);
1965 }
1966 spin_unlock(&recall_lock);
1967 list_for_each_safe(pos, next, &reaplist) {
1968 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1969 list_del_init(&dp->dl_recall_lru);
1970 unhash_delegation(dp);
1971 }
1972 test_val = NFSD_LEASE_TIME;
1973 list_for_each_safe(pos, next, &close_lru) {
1974 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1975 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1976 u = sop->so_time - cutoff;
1977 if (test_val > u)
1978 test_val = u;
1979 break;
1980 }
1981 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1982 sop->so_id);
1983 list_del(&sop->so_close_lru);
1984 nfs4_put_stateowner(sop);
1985 }
1986 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1987 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1988 nfs4_unlock_state();
1989 return clientid_val;
1990}
1991
1992void
1993laundromat_main(void *not_used)
1994{
1995 time_t t;
1996
1997 t = nfs4_laundromat();
1998 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1999 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2000}
2001
2002/* search ownerid_hashtbl[] and close_lru for stateid owner
2003 * (stateid->si_stateownerid)
2004 */
fd39ca9a 2005static struct nfs4_stateowner *
1da177e4
LT		 2006find_openstateowner_id(u32 st_id, int flags) {
2007 struct nfs4_stateowner *local = NULL;
2008
2009 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2010 if (flags & CLOSE_STATE) {
2011 list_for_each_entry(local, &close_lru, so_close_lru) {
2012 if (local->so_id == st_id)
2013 return local;
2014 }
2015 }
2016 return NULL;
2017}
2018
2019static inline int
2020nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2021{
2022 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2023}
2024
2025static int
2026STALE_STATEID(stateid_t *stateid)
2027{
2028 if (stateid->si_boot == boot_time)
2029 return 0;
2030 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2031 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2032 stateid->si_generation);
2033 return 1;
2034}
2035
2036static inline int
2037access_permit_read(unsigned long access_bmap)
2038{
2039 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2040 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2041 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2042}
2043
2044static inline int
2045access_permit_write(unsigned long access_bmap)
2046{
2047 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2048 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2049}
2050
2051static
2052int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2053{
2054 int status = nfserr_openmode;
2055
2056 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2057 goto out;
2058 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2059 goto out;
2060 status = nfs_ok;
2061out:
2062 return status;
2063}
2064
1da177e4
LT		 2065static inline int
2066check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2067{
2068 /* Trying to call delegreturn with a special stateid? Yuch: */
2069 if (!(flags & (RD_STATE | WR_STATE)))
2070 return nfserr_bad_stateid;
2071 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2072 return nfs_ok;
2073 else if (nfs4_in_grace()) {
2074 /* Answer in remaining cases depends on existance of
2075 * conflicting state; so we must wait out the grace period. */
2076 return nfserr_grace;
2077 } else if (flags & WR_STATE)
2078 return nfs4_share_conflict(current_fh,
2079 NFS4_SHARE_DENY_WRITE);
2080 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2081 return nfs4_share_conflict(current_fh,
2082 NFS4_SHARE_DENY_READ);
2083}
2084
2085/*
2086 * Allow READ/WRITE during grace period on recovered state only for files
2087 * that are not able to provide mandatory locking.
2088 */
2089static inline int
2090io_during_grace_disallowed(struct inode *inode, int flags)
2091{
2092 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2093 && MANDATORY_LOCK(inode);
2094}
2095
2096/*
2097* Checks for stateid operations
2098*/
2099int
2100nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2101{
2102 struct nfs4_stateid *stp = NULL;
2103 struct nfs4_delegation *dp = NULL;
2104 stateid_t *stidp;
2105 struct inode *ino = current_fh->fh_dentry->d_inode;
2106 int status;
2107
2108 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2109 stateid->si_boot, stateid->si_stateownerid,
2110 stateid->si_fileid, stateid->si_generation);
2111 if (filpp)
2112 *filpp = NULL;
2113
2114 if (io_during_grace_disallowed(ino, flags))
2115 return nfserr_grace;
2116
2117 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2118 return check_special_stateids(current_fh, stateid, flags);
2119
2120 /* STALE STATEID */
2121 status = nfserr_stale_stateid;
2122 if (STALE_STATEID(stateid))
2123 goto out;
2124
2125 /* BAD STATEID */
2126 status = nfserr_bad_stateid;
2127 if (!stateid->si_fileid) { /* delegation stateid */
2128 if(!(dp = find_delegation_stateid(ino, stateid))) {
2129 dprintk("NFSD: delegation stateid not found\n");
2130 if (nfs4_in_grace())
2131 status = nfserr_grace;
2132 goto out;
2133 }
2134 stidp = &dp->dl_stateid;
2135 } else { /* open or lock stateid */
2136 if (!(stp = find_stateid(stateid, flags))) {
2137 dprintk("NFSD: open or lock stateid not found\n");
2138 if (nfs4_in_grace())
2139 status = nfserr_grace;
2140 goto out;
2141 }
2142 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2143 goto out;
2144 if (!stp->st_stateowner->so_confirmed)
2145 goto out;
2146 stidp = &stp->st_stateid;
2147 }
2148 if (stateid->si_generation > stidp->si_generation)
2149 goto out;
2150
2151 /* OLD STATEID */
2152 status = nfserr_old_stateid;
2153 if (stateid->si_generation < stidp->si_generation)
2154 goto out;
2155 if (stp) {
2156 if ((status = nfs4_check_openmode(stp,flags)))
2157 goto out;
2158 renew_client(stp->st_stateowner->so_client);
2159 if (filpp)
2160 *filpp = stp->st_vfs_file;
2161 } else if (dp) {
2162 if ((status = nfs4_check_delegmode(dp, flags)))
2163 goto out;
2164 renew_client(dp->dl_client);
2165 if (flags & DELEG_RET)
2166 unhash_delegation(dp);
2167 if (filpp)
2168 *filpp = dp->dl_vfs_file;
2169 }
2170 status = nfs_ok;
2171out:
2172 return status;
2173}
2174
2175
2176/*
2177 * Checks for sequence id mutating operations.
2178 */
fd39ca9a 2179static int
1da177e4
LT		 2180nfs4_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)
2181{
2182 int status;
2183 struct nfs4_stateid *stp;
2184 struct nfs4_stateowner *sop;
2185
2186 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2187 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2188 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2189 stateid->si_generation);
2190
2191 *stpp = NULL;
2192 *sopp = NULL;
2193
2194 status = nfserr_bad_stateid;
2195 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2196 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2197 goto out;
2198 }
2199
2200 status = nfserr_stale_stateid;
2201 if (STALE_STATEID(stateid))
2202 goto out;
2203 /*
2204 * We return BAD_STATEID if filehandle doesn't match stateid,
2205 * the confirmed flag is incorrecly set, or the generation
2206 * number is incorrect.
2207 * If there is no entry in the openfile table for this id,
2208 * we can't always return BAD_STATEID;
2209 * this might be a retransmitted CLOSE which has arrived after
2210 * the openfile has been released.
2211 */
2212 if (!(stp = find_stateid(stateid, flags)))
2213 goto no_nfs4_stateid;
2214
2215 status = nfserr_bad_stateid;
2216
2217 /* for new lock stateowners:
2218 * check that the lock->v.new.open_stateid
2219 * refers to an open stateowner
2220 *
2221 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2222 * as the open_stateid->st_stateowner->so_client->clientid
2223 */
2224 if (lockclid) {
2225 struct nfs4_stateowner *sop = stp->st_stateowner;
2226 struct nfs4_client *clp = sop->so_client;
2227
2228 if (!sop->so_is_open_owner)
2229 goto out;
2230 if (!cmp_clid(&clp->cl_clientid, lockclid))
2231 goto out;
2232 }
2233
2234 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2235 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2236 goto out;
2237 }
2238
2239 *stpp = stp;
2240 *sopp = sop = stp->st_stateowner;
2241
2242 /*
2243 * We now validate the seqid and stateid generation numbers.
2244 * For the moment, we ignore the possibility of
2245 * generation number wraparound.
2246 */
2247 if (seqid != sop->so_seqid + 1)
2248 goto check_replay;
2249
2250 if (sop->so_confirmed) {
2251 if (flags & CONFIRM) {
2252 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2253 goto out;
2254 }
2255 }
2256 else {
2257 if (!(flags & CONFIRM)) {
2258 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2259 goto out;
2260 }
2261 }
2262 if (stateid->si_generation > stp->st_stateid.si_generation) {
2263 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2264 goto out;
2265 }
2266
2267 status = nfserr_old_stateid;
2268 if (stateid->si_generation < stp->st_stateid.si_generation) {
2269 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2270 goto out;
2271 }
2272 /* XXX renew the client lease here */
2273 status = nfs_ok;
2274
2275out:
2276 return status;
2277
2278no_nfs4_stateid:
2279
2280 /*
2281 * We determine whether this is a bad stateid or a replay,
2282 * starting by trying to look up the stateowner.
2283 * If stateowner is not found - stateid is bad.
2284 */
2285 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2286 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2287 status = nfserr_bad_stateid;
2288 goto out;
2289 }
2290 *sopp = sop;
2291
2292check_replay:
2293 if (seqid == sop->so_seqid) {
2294 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2295 /* indicate replay to calling function */
2296 status = NFSERR_REPLAY_ME;
2297 } else {
2298 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2299
2300 *sopp = NULL;
2301 status = nfserr_bad_seqid;
2302 }
2303 goto out;
2304}
2305
2306int
2307nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2308{
2309 int status;
2310 struct nfs4_stateowner *sop;
2311 struct nfs4_stateid *stp;
2312
2313 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2314 (int)current_fh->fh_dentry->d_name.len,
2315 current_fh->fh_dentry->d_name.name);
2316
2317 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2318 goto out;
2319
2320 nfs4_lock_state();
2321
2322 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2323 &oc->oc_req_stateid,
2324 CHECK_FH | CONFIRM | OPEN_STATE,
2325 &oc->oc_stateowner, &stp, NULL)))
2326 goto out;
2327
2328 sop = oc->oc_stateowner;
2329 sop->so_confirmed = 1;
2330 update_stateid(&stp->st_stateid);
2331 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2332 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2333 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2334 stp->st_stateid.si_boot,
2335 stp->st_stateid.si_stateownerid,
2336 stp->st_stateid.si_fileid,
2337 stp->st_stateid.si_generation);
2338out:
2339 if (oc->oc_stateowner)
2340 nfs4_get_stateowner(oc->oc_stateowner);
2341 nfs4_unlock_state();
2342 return status;
2343}
2344
2345
2346/*
2347 * unset all bits in union bitmap (bmap) that
2348 * do not exist in share (from successful OPEN_DOWNGRADE)
2349 */
2350static void
2351reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2352{
2353 int i;
2354 for (i = 1; i < 4; i++) {
2355 if ((i & access) != i)
2356 __clear_bit(i, bmap);
2357 }
2358}
2359
2360static void
2361reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2362{
2363 int i;
2364 for (i = 0; i < 4; i++) {
2365 if ((i & deny) != i)
2366 __clear_bit(i, bmap);
2367 }
2368}
2369
2370int
2371nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2372{
2373 int status;
2374 struct nfs4_stateid *stp;
2375 unsigned int share_access;
2376
2377 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2378 (int)current_fh->fh_dentry->d_name.len,
2379 current_fh->fh_dentry->d_name.name);
2380
2381 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2382 return nfserr_inval;
2383
2384 nfs4_lock_state();
2385 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2386 &od->od_stateid,
2387 CHECK_FH | OPEN_STATE,
2388 &od->od_stateowner, &stp, NULL)))
2389 goto out;
2390
2391 status = nfserr_inval;
2392 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2393 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2394 stp->st_access_bmap, od->od_share_access);
2395 goto out;
2396 }
2397 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2398 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2399 stp->st_deny_bmap, od->od_share_deny);
2400 goto out;
2401 }
2402 set_access(&share_access, stp->st_access_bmap);
2403 nfs4_file_downgrade(stp->st_vfs_file,
2404 share_access & ~od->od_share_access);
2405
2406 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2407 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2408
2409 update_stateid(&stp->st_stateid);
2410 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2411 status = nfs_ok;
2412out:
2413 if (od->od_stateowner)
2414 nfs4_get_stateowner(od->od_stateowner);
2415 nfs4_unlock_state();
2416 return status;
2417}
2418
2419/*
2420 * nfs4_unlock_state() called after encode
2421 */
2422int
2423nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2424{
2425 int status;
2426 struct nfs4_stateid *stp;
2427
2428 dprintk("NFSD: nfsd4_close on file %.*s\n",
2429 (int)current_fh->fh_dentry->d_name.len,
2430 current_fh->fh_dentry->d_name.name);
2431
2432 nfs4_lock_state();
2433 /* check close_lru for replay */
2434 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2435 &close->cl_stateid,
2436 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2437 &close->cl_stateowner, &stp, NULL)))
2438 goto out;
2439 /*
2440 * Return success, but first update the stateid.
2441 */
2442 status = nfs_ok;
2443 update_stateid(&stp->st_stateid);
2444 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2445
2446 /* release_state_owner() calls nfsd_close() if needed */
2447 release_state_owner(stp, OPEN_STATE);
2448out:
2449 if (close->cl_stateowner)
2450 nfs4_get_stateowner(close->cl_stateowner);
2451 nfs4_unlock_state();
2452 return status;
2453}
2454
2455int
2456nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2457{
2458 int status;
2459
2460 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2461 goto out;
2462
2463 nfs4_lock_state();
2464 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2465 nfs4_unlock_state();
2466out:
2467 return status;
2468}
2469
2470
2471/*
2472 * Lock owner state (byte-range locks)
2473 */
2474#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2475#define LOCK_HASH_BITS 8
2476#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2477#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2478
2479#define lockownerid_hashval(id) \
2480 ((id) & LOCK_HASH_MASK)
2481
2482static inline unsigned int
2483lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2484 struct xdr_netobj *ownername)
2485{
2486 return (file_hashval(inode) + cl_id
2487 + opaque_hashval(ownername->data, ownername->len))
2488 & LOCK_HASH_MASK;
2489}
2490
2491static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2492static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2493static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2494
fd39ca9a 2495static struct nfs4_stateid *
1da177e4
LT		 2496find_stateid(stateid_t *stid, int flags)
2497{
2498 struct nfs4_stateid *local = NULL;
2499 u32 st_id = stid->si_stateownerid;
2500 u32 f_id = stid->si_fileid;
2501 unsigned int hashval;
2502
2503 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2504 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2505 hashval = stateid_hashval(st_id, f_id);
2506 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2507 if ((local->st_stateid.si_stateownerid == st_id) &&
2508 (local->st_stateid.si_fileid == f_id))
2509 return local;
2510 }
2511 }
2512 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2513 hashval = stateid_hashval(st_id, f_id);
2514 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2515 if ((local->st_stateid.si_stateownerid == st_id) &&
2516 (local->st_stateid.si_fileid == f_id))
2517 return local;
2518 }
2519 } else
2520 printk("NFSD: find_stateid: ERROR: no state flag\n");
2521 return NULL;
2522}
2523
2524static struct nfs4_delegation *
2525find_delegation_stateid(struct inode *ino, stateid_t *stid)
2526{
13cd2184
N		 2527 struct nfs4_file *fp;
2528 struct nfs4_delegation *dl;
1da177e4
LT		 2529
2530 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2531 stid->si_boot, stid->si_stateownerid,
2532 stid->si_fileid, stid->si_generation);
2533
1da177e4 2534 fp = find_file(ino);
13cd2184
N		 2535 if (!fp)
2536 return NULL;
2537 dl = find_delegation_file(fp, stid);
2538 put_nfs4_file(fp);
2539 return dl;
1da177e4
LT		 2540}
2541
2542/*
2543 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2544 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2545 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2546 * locking, this prevents us from being completely protocol-compliant. The
2547 * real solution to this problem is to start using unsigned file offsets in
2548 * the VFS, but this is a very deep change!
2549 */
2550static inline void
2551nfs4_transform_lock_offset(struct file_lock *lock)
2552{
2553 if (lock->fl_start < 0)
2554 lock->fl_start = OFFSET_MAX;
2555 if (lock->fl_end < 0)
2556 lock->fl_end = OFFSET_MAX;
2557}
2558
fd39ca9a 2559static int
1da177e4
LT		 2560nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2561{
2562 struct nfs4_stateowner *local = NULL;
2563 int status = 0;
2564
2565 if (hashval >= LOCK_HASH_SIZE)
2566 goto out;
2567 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2568 if (local == sop) {
2569 status = 1;
2570 goto out;
2571 }
2572 }
2573out:
2574 return status;
2575}
2576
2577
2578static inline void
2579nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2580{
2581 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2582 unsigned int hval = lockownerid_hashval(sop->so_id);
2583
2584 deny->ld_sop = NULL;
2585 if (nfs4_verify_lock_stateowner(sop, hval)) {
2586 kref_get(&sop->so_ref);
2587 deny->ld_sop = sop;
2588 deny->ld_clientid = sop->so_client->cl_clientid;
2589 }
2590 deny->ld_start = fl->fl_start;
2591 deny->ld_length = ~(u64)0;
2592 if (fl->fl_end != ~(u64)0)
2593 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2594 deny->ld_type = NFS4_READ_LT;
2595 if (fl->fl_type != F_RDLCK)
2596 deny->ld_type = NFS4_WRITE_LT;
2597}
2598
2599static struct nfs4_stateowner *
2600find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2601{
2602 struct nfs4_stateowner *local = NULL;
2603 int i;
2604
2605 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2606 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2607 if (!cmp_owner_str(local, owner, clid))
2608 continue;
2609 return local;
2610 }
2611 }
2612 return NULL;
2613}
2614
2615static struct nfs4_stateowner *
2616find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2617 struct xdr_netobj *owner)
2618{
2619 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2620 struct nfs4_stateowner *op;
2621
2622 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2623 if (cmp_owner_str(op, owner, clid))
2624 return op;
2625 }
2626 return NULL;
2627}
2628
2629/*
2630 * Alloc a lock owner structure.
2631 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2632 * occured.
2633 *
2634 * strhashval = lock_ownerstr_hashval
2635 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2636 */
2637
2638static struct nfs4_stateowner *
2639alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2640 struct nfs4_stateowner *sop;
2641 struct nfs4_replay *rp;
2642 unsigned int idhashval;
2643
2644 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2645 return NULL;
2646 idhashval = lockownerid_hashval(current_ownerid);
2647 INIT_LIST_HEAD(&sop->so_idhash);
2648 INIT_LIST_HEAD(&sop->so_strhash);
2649 INIT_LIST_HEAD(&sop->so_perclient);
2650 INIT_LIST_HEAD(&sop->so_perfilestate);
2651 INIT_LIST_HEAD(&sop->so_perlockowner);
2652 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2653 sop->so_time = 0;
2654 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2655 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2656 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2657 sop->so_is_open_owner = 0;
2658 sop->so_id = current_ownerid++;
2659 sop->so_client = clp;
2660 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2661 sop->so_confirmed = 1;
2662 rp = &sop->so_replay;
2663 rp->rp_status = NFSERR_SERVERFAULT;
2664 rp->rp_buflen = 0;
2665 rp->rp_buf = rp->rp_ibuf;
2666 return sop;
2667}
2668
fd39ca9a 2669static struct nfs4_stateid *
1da177e4
LT		 2670alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2671{
2672 struct nfs4_stateid *stp;
2673 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2674
5ac049ac
N		 2675 stp = nfs4_alloc_stateid();
2676 if (stp == NULL)
1da177e4
LT		 2677 goto out;
2678 INIT_LIST_HEAD(&stp->st_hash);
2679 INIT_LIST_HEAD(&stp->st_perfile);
2680 INIT_LIST_HEAD(&stp->st_perfilestate);
2681 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2682 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2683 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4
LT		 2684 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2685 stp->st_stateowner = sop;
13cd2184 2686 get_nfs4_file(fp);
1da177e4
LT		 2687 stp->st_file = fp;
2688 stp->st_stateid.si_boot = boot_time;
2689 stp->st_stateid.si_stateownerid = sop->so_id;
2690 stp->st_stateid.si_fileid = fp->fi_id;
2691 stp->st_stateid.si_generation = 0;
2692 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2693 stp->st_access_bmap = open_stp->st_access_bmap;
2694 stp->st_deny_bmap = open_stp->st_deny_bmap;
2695
2696out:
2697 return stp;
2698}
2699
fd39ca9a 2700static int
1da177e4
LT		 2701check_lock_length(u64 offset, u64 length)
2702{
2703 return ((length == 0) || ((length != ~(u64)0) &&
2704 LOFF_OVERFLOW(offset, length)));
2705}
2706
2707/*
2708 * LOCK operation
2709 */
2710int
2711nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2712{
2713 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2714 struct nfs4_stateid *lock_stp;
2715 struct file *filp;
2716 struct file_lock file_lock;
2717 struct file_lock *conflock;
2718 int status = 0;
2719 unsigned int strhashval;
2720
2721 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2722 (long long) lock->lk_offset,
2723 (long long) lock->lk_length);
2724
2725 if (nfs4_in_grace() && !lock->lk_reclaim)
2726 return nfserr_grace;
2727 if (!nfs4_in_grace() && lock->lk_reclaim)
2728 return nfserr_no_grace;
2729
2730 if (check_lock_length(lock->lk_offset, lock->lk_length))
2731 return nfserr_inval;
2732
2733 nfs4_lock_state();
2734
2735 if (lock->lk_is_new) {
2736 /*
2737 * Client indicates that this is a new lockowner.
2738 * Use open owner and open stateid to create lock owner and lock
2739 * stateid.
2740 */
2741 struct nfs4_stateid *open_stp = NULL;
2742 struct nfs4_file *fp;
2743
2744 status = nfserr_stale_clientid;
2745 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2746 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2747 goto out;
2748 }
2749
2750 /* is the new lock seqid presented by the client zero? */
2751 status = nfserr_bad_seqid;
2752 if (lock->v.new.lock_seqid != 0)
2753 goto out;
2754
2755 /* validate and update open stateid and open seqid */
2756 status = nfs4_preprocess_seqid_op(current_fh,
2757 lock->lk_new_open_seqid,
2758 &lock->lk_new_open_stateid,
2759 CHECK_FH | OPEN_STATE,
2760 &open_sop, &open_stp,
2761 &lock->v.new.clientid);
2762 if (status) {
2763 if (lock->lk_reclaim)
2764 status = nfserr_reclaim_bad;
2765 goto out;
2766 }
2767 /* create lockowner and lock stateid */
2768 fp = open_stp->st_file;
2769 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2770 open_sop->so_client->cl_clientid.cl_id,
2771 &lock->v.new.owner);
2772 /*
2773 * If we already have this lock owner, the client is in
2774 * error (or our bookeeping is wrong!)
2775 * for asking for a 'new lock'.
2776 */
2777 status = nfserr_bad_stateid;
2778 lock_sop = find_lockstateowner(&lock->v.new.owner,
2779 &lock->v.new.clientid);
2780 if (lock_sop)
2781 goto out;
2782 status = nfserr_resource;
2783 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2784 goto out;
2785 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2786 fp, open_stp)) == NULL) {
2787 release_stateowner(lock->lk_stateowner);
2788 lock->lk_stateowner = NULL;
2789 goto out;
2790 }
2791 /* bump the open seqid used to create the lock */
2792 open_sop->so_seqid++;
2793 } else {
2794 /* lock (lock owner + lock stateid) already exists */
2795 status = nfs4_preprocess_seqid_op(current_fh,
2796 lock->lk_old_lock_seqid,
2797 &lock->lk_old_lock_stateid,
2798 CHECK_FH | LOCK_STATE,
2799 &lock->lk_stateowner, &lock_stp, NULL);
2800 if (status)
2801 goto out;
2802 }
2803 /* lock->lk_stateowner and lock_stp have been created or found */
2804 filp = lock_stp->st_vfs_file;
2805
2806 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2807 printk("NFSD: nfsd4_lock: permission denied!\n");
2808 goto out;
2809 }
2810
2811 locks_init_lock(&file_lock);
2812 switch (lock->lk_type) {
2813 case NFS4_READ_LT:
2814 case NFS4_READW_LT:
2815 file_lock.fl_type = F_RDLCK;
2816 break;
2817 case NFS4_WRITE_LT:
2818 case NFS4_WRITEW_LT:
2819 file_lock.fl_type = F_WRLCK;
2820 break;
2821 default:
2822 status = nfserr_inval;
2823 goto out;
2824 }
2825 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2826 file_lock.fl_pid = current->tgid;
2827 file_lock.fl_file = filp;
2828 file_lock.fl_flags = FL_POSIX;
2829
2830 file_lock.fl_start = lock->lk_offset;
2831 if ((lock->lk_length == ~(u64)0) ||
2832 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2833 file_lock.fl_end = ~(u64)0;
2834 else
2835 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2836 nfs4_transform_lock_offset(&file_lock);
2837
2838 /*
2839 * Try to lock the file in the VFS.
2840 * Note: locks.c uses the BKL to protect the inode's lock list.
2841 */
2842
2843 status = posix_lock_file(filp, &file_lock);
2844 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2845 file_lock.fl_ops->fl_release_private(&file_lock);
2846 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2847 switch (-status) {
2848 case 0: /* success! */
2849 update_stateid(&lock_stp->st_stateid);
2850 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2851 sizeof(stateid_t));
2852 goto out;
2853 case (EAGAIN):
2854 goto conflicting_lock;
2855 case (EDEADLK):
2856 status = nfserr_deadlock;
2857 default:
2858 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2859 goto out_destroy_new_stateid;
2860 }
2861
2862conflicting_lock:
2863 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2864 status = nfserr_denied;
2865 /* XXX There is a race here. Future patch needed to provide
2866 * an atomic posix_lock_and_test_file
2867 */
2868 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2869 status = nfserr_serverfault;
2870 goto out;
2871 }
2872 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2873
2874out_destroy_new_stateid:
2875 if (lock->lk_is_new) {
2876 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2877 /*
2878 * An error encountered after instantiation of the new
2879 * stateid has forced us to destroy it.
2880 */
2881 if (!seqid_mutating_err(status))
2882 open_sop->so_seqid--;
2883
2884 release_state_owner(lock_stp, LOCK_STATE);
2885 }
2886out:
2887 if (lock->lk_stateowner)
2888 nfs4_get_stateowner(lock->lk_stateowner);
2889 nfs4_unlock_state();
2890 return status;
2891}
2892
2893/*
2894 * LOCKT operation
2895 */
2896int
2897nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2898{
2899 struct inode *inode;
2900 struct file file;
2901 struct file_lock file_lock;
2902 struct file_lock *conflicting_lock;
2903 int status;
2904
2905 if (nfs4_in_grace())
2906 return nfserr_grace;
2907
2908 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2909 return nfserr_inval;
2910
2911 lockt->lt_stateowner = NULL;
2912 nfs4_lock_state();
2913
2914 status = nfserr_stale_clientid;
2915 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2916 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2917 goto out;
2918 }
2919
2920 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2921 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2922 if (status == nfserr_symlink)
2923 status = nfserr_inval;
2924 goto out;
2925 }
2926
2927 inode = current_fh->fh_dentry->d_inode;
2928 locks_init_lock(&file_lock);
2929 switch (lockt->lt_type) {
2930 case NFS4_READ_LT:
2931 case NFS4_READW_LT:
2932 file_lock.fl_type = F_RDLCK;
2933 break;
2934 case NFS4_WRITE_LT:
2935 case NFS4_WRITEW_LT:
2936 file_lock.fl_type = F_WRLCK;
2937 break;
2938 default:
2939 printk("NFSD: nfs4_lockt: bad lock type!\n");
2940 status = nfserr_inval;
2941 goto out;
2942 }
2943
2944 lockt->lt_stateowner = find_lockstateowner_str(inode,
2945 &lockt->lt_clientid, &lockt->lt_owner);
2946 if (lockt->lt_stateowner)
2947 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2948 file_lock.fl_pid = current->tgid;
2949 file_lock.fl_flags = FL_POSIX;
2950
2951 file_lock.fl_start = lockt->lt_offset;
2952 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2953 file_lock.fl_end = ~(u64)0;
2954 else
2955 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2956
2957 nfs4_transform_lock_offset(&file_lock);
2958
2959 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2960 * since LOCKT doesn't require an OPEN, and therefore a struct
2961 * file may not exist, pass posix_test_lock a struct file with
2962 * only the dentry:inode set.
2963 */
2964 memset(&file, 0, sizeof (struct file));
2965 file.f_dentry = current_fh->fh_dentry;
2966
2967 status = nfs_ok;
2968 conflicting_lock = posix_test_lock(&file, &file_lock);
2969 if (conflicting_lock) {
2970 status = nfserr_denied;
2971 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2972 }
2973out:
2974 nfs4_unlock_state();
2975 return status;
2976}
2977
2978int
2979nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2980{
2981 struct nfs4_stateid *stp;
2982 struct file *filp = NULL;
2983 struct file_lock file_lock;
2984 int status;
2985
2986 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2987 (long long) locku->lu_offset,
2988 (long long) locku->lu_length);
2989
2990 if (check_lock_length(locku->lu_offset, locku->lu_length))
2991 return nfserr_inval;
2992
2993 nfs4_lock_state();
2994
2995 if ((status = nfs4_preprocess_seqid_op(current_fh,
2996 locku->lu_seqid,
2997 &locku->lu_stateid,
2998 CHECK_FH | LOCK_STATE,
2999 &locku->lu_stateowner, &stp, NULL)))
3000 goto out;
3001
3002 filp = stp->st_vfs_file;
3003 BUG_ON(!filp);
3004 locks_init_lock(&file_lock);
3005 file_lock.fl_type = F_UNLCK;
3006 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3007 file_lock.fl_pid = current->tgid;
3008 file_lock.fl_file = filp;
3009 file_lock.fl_flags = FL_POSIX;
3010 file_lock.fl_start = locku->lu_offset;
3011
3012 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
3013 file_lock.fl_end = ~(u64)0;
3014 else
3015 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
3016 nfs4_transform_lock_offset(&file_lock);
3017
3018 /*
3019 * Try to unlock the file in the VFS.
3020 */
3021 status = posix_lock_file(filp, &file_lock);
3022 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3023 file_lock.fl_ops->fl_release_private(&file_lock);
3024 if (status) {
3025 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3026 goto out_nfserr;
3027 }
3028 /*
3029 * OK, unlock succeeded; the only thing left to do is update the stateid.
3030 */
3031 update_stateid(&stp->st_stateid);
3032 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3033
3034out:
3035 if (locku->lu_stateowner)
3036 nfs4_get_stateowner(locku->lu_stateowner);
3037 nfs4_unlock_state();
3038 return status;
3039
3040out_nfserr:
3041 status = nfserrno(status);
3042 goto out;
3043}
3044
3045/*
3046 * returns
3047 * 1: locks held by lockowner
3048 * 0: no locks held by lockowner
3049 */
3050static int
3051check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3052{
3053 struct file_lock **flpp;
3054 struct inode *inode = filp->f_dentry->d_inode;
3055 int status = 0;
3056
3057 lock_kernel();
3058 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3059 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3060 status = 1;
3061 goto out;
3062 }
3063out:
3064 unlock_kernel();
3065 return status;
3066}
3067
3068int
3069nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3070{
3071 clientid_t *clid = &rlockowner->rl_clientid;
3072 struct nfs4_stateowner *local = NULL;
3073 struct xdr_netobj *owner = &rlockowner->rl_owner;
3074 int status;
3075
3076 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3077 clid->cl_boot, clid->cl_id);
3078
3079 /* XXX check for lease expiration */
3080
3081 status = nfserr_stale_clientid;
3082 if (STALE_CLIENTID(clid)) {
3083 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3084 return status;
3085 }
3086
3087 nfs4_lock_state();
3088
3089 status = nfs_ok;
3090 local = find_lockstateowner(owner, clid);
3091 if (local) {
3092 struct nfs4_stateid *stp;
3093
3094 /* check for any locks held by any stateid
3095 * associated with the (lock) stateowner */
3096 status = nfserr_locks_held;
3097 list_for_each_entry(stp, &local->so_perfilestate,
3098 st_perfilestate) {
3099 if (check_for_locks(stp->st_vfs_file, local))
3100 goto out;
3101 }
3102 /* no locks held by (lock) stateowner */
3103 status = nfs_ok;
3104 release_stateowner(local);
3105 }
3106out:
3107 nfs4_unlock_state();
3108 return status;
3109}
3110
3111static inline struct nfs4_client_reclaim *
a55370a3 3112alloc_reclaim(void)
1da177e4 3113{
a55370a3 3114 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3115}
3116
3117/*
3118 * failure => all reset bets are off, nfserr_no_grace...
3119 */
3120static int
a55370a3 3121nfs4_client_to_reclaim(char *name)
1da177e4
LT		 3122{
3123 unsigned int strhashval;
3124 struct nfs4_client_reclaim *crp = NULL;
3125
a55370a3
N		 3126 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3127 crp = alloc_reclaim();
1da177e4
LT		 3128 if (!crp)
3129 return 0;
a55370a3 3130 strhashval = clientstr_hashval(name);
1da177e4
LT		 3131 INIT_LIST_HEAD(&crp->cr_strhash);
3132 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3133 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3134 reclaim_str_hashtbl_size++;
3135 return 1;
3136}
3137
3138static void
3139nfs4_release_reclaim(void)
3140{
3141 struct nfs4_client_reclaim *crp = NULL;
3142 int i;
3143
1da177e4
LT		 3144 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3145 while (!list_empty(&reclaim_str_hashtbl[i])) {
3146 crp = list_entry(reclaim_str_hashtbl[i].next,
3147 struct nfs4_client_reclaim, cr_strhash);
3148 list_del(&crp->cr_strhash);
1da177e4
LT		 3149 kfree(crp);
3150 reclaim_str_hashtbl_size--;
3151 }
3152 }
3153 BUG_ON(reclaim_str_hashtbl_size);
3154}
3155
3156/*
3157 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3158static struct nfs4_client_reclaim *
1da177e4
LT		 3159nfs4_find_reclaim_client(clientid_t *clid)
3160{
3161 unsigned int strhashval;
3162 struct nfs4_client *clp;
3163 struct nfs4_client_reclaim *crp = NULL;
3164
3165
3166 /* find clientid in conf_id_hashtbl */
3167 clp = find_confirmed_client(clid);
3168 if (clp == NULL)
3169 return NULL;
3170
a55370a3
N		 3171 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3172 clp->cl_name.len, clp->cl_name.data,
3173 clp->cl_recdir);
1da177e4
LT		 3174
3175 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3176 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3177 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3178 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3179 return crp;
3180 }
3181 }
3182 return NULL;
3183}
3184
3185/*
3186* Called from OPEN. Look for clientid in reclaim list.
3187*/
3188int
3189nfs4_check_open_reclaim(clientid_t *clid)
3190{
dfc83565 3191 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3192}
3193
ac4d8ff2 3194/* initialization to perform at module load time: */
1da177e4 3195
ac4d8ff2
N		 3196void
3197nfs4_state_init(void)
1da177e4
LT		 3198{
3199 int i;
1da177e4 3200
1da177e4
LT		 3201 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3202 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3203 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3204 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3205 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3206 }
3207 for (i = 0; i < FILE_HASH_SIZE; i++) {
3208 INIT_LIST_HEAD(&file_hashtbl[i]);
3209 }
3210 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3211 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3212 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3213 }
3214 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3215 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3216 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3217 }
3218 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3219 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3220 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3221 }
1da177e4 3222 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3223 INIT_LIST_HEAD(&close_lru);
3224 INIT_LIST_HEAD(&client_lru);
3225 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3226 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3227 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3228 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3229}
3230
3231/* initialization to perform when the nfsd service is started: */
3232
3233static void
3234__nfs4_state_start(void)
3235{
3236 time_t grace_time;
3237
1da177e4 3238 boot_time = get_seconds();
d99a05ad
N		 3239 grace_time = max(user_lease_time, lease_time);
3240 lease_time = user_lease_time;
a76b4319 3241 in_grace = 1;
d99a05ad 3242 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3243 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3244 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3245}
3246
3247int
76a3550e 3248nfs4_state_start(void)
1da177e4
LT		 3249{
3250 int status;
3251
3252 if (nfs4_init)
3253 return 0;
3254 status = nfsd4_init_slabs();
3255 if (status)
3256 return status;
76a3550e 3257 __nfs4_state_start();
1da177e4
LT		 3258 nfs4_init = 1;
3259 return 0;
3260}
3261
3262int
3263nfs4_in_grace(void)
3264{
a76b4319 3265 return in_grace;
1da177e4
LT		 3266}
3267
3268time_t
3269nfs4_lease_time(void)
3270{
3271 return lease_time;
3272}
3273
3274static void
3275__nfs4_state_shutdown(void)
3276{
3277 int i;
3278 struct nfs4_client *clp = NULL;
3279 struct nfs4_delegation *dp = NULL;
3280 struct nfs4_stateowner *sop = NULL;
3281 struct list_head *pos, *next, reaplist;
3282
3283 list_for_each_safe(pos, next, &close_lru) {
3284 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3285 list_del(&sop->so_close_lru);
3286 nfs4_put_stateowner(sop);
3287 }
3288
3289 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3290 while (!list_empty(&conf_id_hashtbl[i])) {
3291 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3292 expire_client(clp);
3293 }
3294 while (!list_empty(&unconf_str_hashtbl[i])) {
3295 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3296 expire_client(clp);
3297 }
3298 }
3299 INIT_LIST_HEAD(&reaplist);
3300 spin_lock(&recall_lock);
3301 list_for_each_safe(pos, next, &del_recall_lru) {
3302 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3303 list_move(&dp->dl_recall_lru, &reaplist);
3304 }
3305 spin_unlock(&recall_lock);
3306 list_for_each_safe(pos, next, &reaplist) {
3307 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3308 list_del_init(&dp->dl_recall_lru);
3309 unhash_delegation(dp);
3310 }
3311
1da177e4 3312 cancel_delayed_work(&laundromat_work);
58da282b
N		 3313 flush_workqueue(laundry_wq);
3314 destroy_workqueue(laundry_wq);
1da177e4 3315 nfs4_init = 0;
1da177e4
LT		 3316}
3317
3318void
3319nfs4_state_shutdown(void)
3320{
3321 nfs4_lock_state();
3322 nfs4_release_reclaim();
3323 __nfs4_state_shutdown();
3324 nfsd4_free_slabs();
3325 nfs4_unlock_state();
3326}
3327
3328/*
3329 * Called when leasetime is changed.
3330 *
d99a05ad
N		 3331 * The only way the protocol gives us to handle on-the-fly lease changes is to
3332 * simulate a reboot. Instead of doing that, we just wait till the next time
3333 * we start to register any changes in lease time. If the administrator
3334 * really wants to change the lease time *now*, they can go ahead and bring
3335 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3336 */
3337void
3338nfs4_reset_lease(time_t leasetime)
3339{
d99a05ad
N		 3340 lock_kernel();
3341 user_lease_time = leasetime;
3342 unlock_kernel();
1da177e4 3343}
Linux 6.x block layer and io_uring tree(s)