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