projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] knfsd: nfsd4: setclientid_confirm comments
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Globals */
55static time_t lease_time = 90; /* default lease time */
d99a05ad 56static time_t user_lease_time = 90;
fd39ca9a 57static time_t boot_time;
a76b4319 58static int in_grace = 1;
1da177e4
LT		 59static u32 current_clientid = 1;
60static u32 current_ownerid = 1;
61static u32 current_fileid = 1;
62static u32 current_delegid = 1;
63static u32 nfs4_init;
fd39ca9a
N		 64static stateid_t zerostateid; /* bits all 0 */
65static stateid_t onestateid; /* bits all 1 */
66
67#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
68#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 69
1da177e4 70/* forward declarations */
fd39ca9a 71static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 72static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
73static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
74
75/* Locking:
76 *
77 * client_sema:
78 * protects clientid_hashtbl[], clientstr_hashtbl[],
79 * unconfstr_hashtbl[], uncofid_hashtbl[].
80 */
81static DECLARE_MUTEX(client_sema);
82
fd39ca9a
N		 83static kmem_cache_t *stateowner_slab = NULL;
84static kmem_cache_t *file_slab = NULL;
85static kmem_cache_t *stateid_slab = NULL;
86static kmem_cache_t *deleg_slab = NULL;
e60d4398 87
1da177e4
LT		 88void
89nfs4_lock_state(void)
90{
91 down(&client_sema);
92}
93
94void
95nfs4_unlock_state(void)
96{
97 up(&client_sema);
98}
99
100static inline u32
101opaque_hashval(const void *ptr, int nbytes)
102{
103 unsigned char *cptr = (unsigned char *) ptr;
104
105 u32 x = 0;
106 while (nbytes--) {
107 x *= 37;
108 x += *cptr++;
109 }
110 return x;
111}
112
113/* forward declarations */
114static void release_stateowner(struct nfs4_stateowner *sop);
115static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 116
117/*
118 * Delegation state
119 */
120
121/* recall_lock protects the del_recall_lru */
fd39ca9a 122static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static void
126free_nfs4_file(struct kref *kref)
127{
128 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
129 list_del(&fp->fi_hash);
130 iput(fp->fi_inode);
131 kmem_cache_free(file_slab, fp);
132}
133
134static inline void
135put_nfs4_file(struct nfs4_file *fi)
136{
137 kref_put(&fi->fi_ref, free_nfs4_file);
138}
139
140static inline void
141get_nfs4_file(struct nfs4_file *fi)
142{
143 kref_get(&fi->fi_ref);
144}
145
1da177e4
LT		 146static struct nfs4_delegation *
147alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
148{
149 struct nfs4_delegation *dp;
150 struct nfs4_file *fp = stp->st_file;
151 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
152
153 dprintk("NFSD alloc_init_deleg\n");
5b2d21c1
N		 154 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
155 if (dp == NULL)
1da177e4
LT		 156 return dp;
157 INIT_LIST_HEAD(&dp->dl_del_perfile);
158 INIT_LIST_HEAD(&dp->dl_del_perclnt);
159 INIT_LIST_HEAD(&dp->dl_recall_lru);
160 dp->dl_client = clp;
13cd2184 161 get_nfs4_file(fp);
1da177e4
LT		 162 dp->dl_file = fp;
163 dp->dl_flock = NULL;
164 get_file(stp->st_vfs_file);
165 dp->dl_vfs_file = stp->st_vfs_file;
166 dp->dl_type = type;
167 dp->dl_recall.cbr_dp = NULL;
168 dp->dl_recall.cbr_ident = cb->cb_ident;
169 dp->dl_recall.cbr_trunc = 0;
170 dp->dl_stateid.si_boot = boot_time;
171 dp->dl_stateid.si_stateownerid = current_delegid++;
172 dp->dl_stateid.si_fileid = 0;
173 dp->dl_stateid.si_generation = 0;
174 dp->dl_fhlen = current_fh->fh_handle.fh_size;
175 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
176 current_fh->fh_handle.fh_size);
177 dp->dl_time = 0;
178 atomic_set(&dp->dl_count, 1);
8beefa24 179 list_add(&dp->dl_del_perfile, &fp->fi_delegations);
1da177e4 180 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
1da177e4
LT		 181 return dp;
182}
183
184void
185nfs4_put_delegation(struct nfs4_delegation *dp)
186{
187 if (atomic_dec_and_test(&dp->dl_count)) {
188 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 189 put_nfs4_file(dp->dl_file);
5b2d21c1 190 kmem_cache_free(deleg_slab, dp);
1da177e4
LT		 191 }
192}
193
194/* Remove the associated file_lock first, then remove the delegation.
195 * lease_modify() is called to remove the FS_LEASE file_lock from
196 * the i_flock list, eventually calling nfsd's lock_manager
197 * fl_release_callback.
198 */
199static void
200nfs4_close_delegation(struct nfs4_delegation *dp)
201{
202 struct file *filp = dp->dl_vfs_file;
203
204 dprintk("NFSD: close_delegation dp %p\n",dp);
205 dp->dl_vfs_file = NULL;
206 /* The following nfsd_close may not actually close the file,
207 * but we want to remove the lease in any case. */
c907132d
N		 208 if (dp->dl_flock)
209 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 210 nfsd_close(filp);
1da177e4
LT		 211}
212
213/* Called under the state lock. */
214static void
215unhash_delegation(struct nfs4_delegation *dp)
216{
217 list_del_init(&dp->dl_del_perfile);
218 list_del_init(&dp->dl_del_perclnt);
219 spin_lock(&recall_lock);
220 list_del_init(&dp->dl_recall_lru);
221 spin_unlock(&recall_lock);
222 nfs4_close_delegation(dp);
223 nfs4_put_delegation(dp);
224}
225
226/*
227 * SETCLIENTID state
228 */
229
230/* Hash tables for nfs4_clientid state */
231#define CLIENT_HASH_BITS 4
232#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
233#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
234
235#define clientid_hashval(id) \
236 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 237#define clientstr_hashval(name) \
238 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 239/*
240 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
241 * used in reboot/reset lease grace period processing
242 *
243 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
244 * setclientid_confirmed info.
245 *
246 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
247 * setclientid info.
248 *
249 * client_lru holds client queue ordered by nfs4_client.cl_time
250 * for lease renewal.
251 *
252 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
253 * for last close replay.
254 */
255static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
256static int reclaim_str_hashtbl_size = 0;
257static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
258static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
259static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
260static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
261static struct list_head client_lru;
262static struct list_head close_lru;
263
264static inline void
265renew_client(struct nfs4_client *clp)
266{
267 /*
268 * Move client to the end to the LRU list.
269 */
270 dprintk("renewing client (clientid %08x/%08x)\n",
271 clp->cl_clientid.cl_boot,
272 clp->cl_clientid.cl_id);
273 list_move_tail(&clp->cl_lru, &client_lru);
274 clp->cl_time = get_seconds();
275}
276
277/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
278static int
279STALE_CLIENTID(clientid_t *clid)
280{
281 if (clid->cl_boot == boot_time)
282 return 0;
283 dprintk("NFSD stale clientid (%08x/%08x)\n",
284 clid->cl_boot, clid->cl_id);
285 return 1;
286}
287
288/*
289 * XXX Should we use a slab cache ?
290 * This type of memory management is somewhat inefficient, but we use it
291 * anyway since SETCLIENTID is not a common operation.
292 */
293static inline struct nfs4_client *
294alloc_client(struct xdr_netobj name)
295{
296 struct nfs4_client *clp;
297
298 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
299 memset(clp, 0, sizeof(*clp));
300 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
301 memcpy(clp->cl_name.data, name.data, name.len);
302 clp->cl_name.len = name.len;
303 }
304 else {
305 kfree(clp);
306 clp = NULL;
307 }
308 }
309 return clp;
310}
311
312static inline void
313free_client(struct nfs4_client *clp)
314{
315 if (clp->cl_cred.cr_group_info)
316 put_group_info(clp->cl_cred.cr_group_info);
317 kfree(clp->cl_name.data);
318 kfree(clp);
319}
320
321void
322put_nfs4_client(struct nfs4_client *clp)
323{
324 if (atomic_dec_and_test(&clp->cl_count))
325 free_client(clp);
326}
327
328static void
329expire_client(struct nfs4_client *clp)
330{
331 struct nfs4_stateowner *sop;
332 struct nfs4_delegation *dp;
333 struct nfs4_callback *cb = &clp->cl_callback;
334 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
335 struct list_head reaplist;
336
337 dprintk("NFSD: expire_client cl_count %d\n",
338 atomic_read(&clp->cl_count));
339
340 /* shutdown rpc client, ending any outstanding recall rpcs */
341 if (atomic_read(&cb->cb_set) == 1 && clnt) {
342 rpc_shutdown_client(clnt);
343 clnt = clp->cl_callback.cb_client = NULL;
344 }
345
346 INIT_LIST_HEAD(&reaplist);
347 spin_lock(&recall_lock);
348 while (!list_empty(&clp->cl_del_perclnt)) {
349 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
350 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
351 dp->dl_flock);
352 list_del_init(&dp->dl_del_perclnt);
353 list_move(&dp->dl_recall_lru, &reaplist);
354 }
355 spin_unlock(&recall_lock);
356 while (!list_empty(&reaplist)) {
357 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
358 list_del_init(&dp->dl_recall_lru);
359 unhash_delegation(dp);
360 }
361 list_del(&clp->cl_idhash);
362 list_del(&clp->cl_strhash);
363 list_del(&clp->cl_lru);
364 while (!list_empty(&clp->cl_perclient)) {
365 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
366 release_stateowner(sop);
367 }
368 put_nfs4_client(clp);
369}
370
371static struct nfs4_client *
a55370a3 372create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 373 struct nfs4_client *clp;
374
375 if (!(clp = alloc_client(name)))
376 goto out;
a55370a3 377 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 378 atomic_set(&clp->cl_count, 1);
379 atomic_set(&clp->cl_callback.cb_set, 0);
380 clp->cl_callback.cb_parsed = 0;
381 INIT_LIST_HEAD(&clp->cl_idhash);
382 INIT_LIST_HEAD(&clp->cl_strhash);
383 INIT_LIST_HEAD(&clp->cl_perclient);
384 INIT_LIST_HEAD(&clp->cl_del_perclnt);
385 INIT_LIST_HEAD(&clp->cl_lru);
386out:
387 return clp;
388}
389
390static void
391copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
392 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
393}
394
395static void
396copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
397 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
398 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
399}
400
401static void
402copy_cred(struct svc_cred *target, struct svc_cred *source) {
403
404 target->cr_uid = source->cr_uid;
405 target->cr_gid = source->cr_gid;
406 target->cr_group_info = source->cr_group_info;
407 get_group_info(target->cr_group_info);
408}
409
a55370a3
N		 410static inline int
411same_name(const char *n1, const char *n2) {
412 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 413}
414
415static int
416cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
417 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
418}
419
420static int
421cmp_clid(clientid_t * cl1, clientid_t * cl2) {
422 return((cl1->cl_boot == cl2->cl_boot) &&
423 (cl1->cl_id == cl2->cl_id));
424}
425
426/* XXX what about NGROUP */
427static int
428cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
429 return(cr1->cr_uid == cr2->cr_uid);
430
431}
432
433static void
434gen_clid(struct nfs4_client *clp) {
435 clp->cl_clientid.cl_boot = boot_time;
436 clp->cl_clientid.cl_id = current_clientid++;
437}
438
439static void
440gen_confirm(struct nfs4_client *clp) {
441 struct timespec tv;
442 u32 * p;
443
444 tv = CURRENT_TIME;
445 p = (u32 *)clp->cl_confirm.data;
446 *p++ = tv.tv_sec;
447 *p++ = tv.tv_nsec;
448}
449
450static int
451check_name(struct xdr_netobj name) {
452
453 if (name.len == 0)
454 return 0;
455 if (name.len > NFS4_OPAQUE_LIMIT) {
456 printk("NFSD: check_name: name too long(%d)!\n", name.len);
457 return 0;
458 }
459 return 1;
460}
461
fd39ca9a 462static void
1da177e4
LT		 463add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
464{
465 unsigned int idhashval;
466
467 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
468 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
469 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
470 list_add_tail(&clp->cl_lru, &client_lru);
471 clp->cl_time = get_seconds();
472}
473
fd39ca9a 474static void
1da177e4
LT		 475move_to_confirmed(struct nfs4_client *clp)
476{
477 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
478 unsigned int strhashval;
479
480 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
481 list_del_init(&clp->cl_strhash);
482 list_del_init(&clp->cl_idhash);
483 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 484 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 485 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
486 renew_client(clp);
487}
488
489static struct nfs4_client *
490find_confirmed_client(clientid_t *clid)
491{
492 struct nfs4_client *clp;
493 unsigned int idhashval = clientid_hashval(clid->cl_id);
494
495 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
496 if (cmp_clid(&clp->cl_clientid, clid))
497 return clp;
498 }
499 return NULL;
500}
501
502static struct nfs4_client *
503find_unconfirmed_client(clientid_t *clid)
504{
505 struct nfs4_client *clp;
506 unsigned int idhashval = clientid_hashval(clid->cl_id);
507
508 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
509 if (cmp_clid(&clp->cl_clientid, clid))
510 return clp;
511 }
512 return NULL;
513}
514
28ce6054
N		 515static struct nfs4_client *
516find_confirmed_client_by_str(const char *dname, unsigned int hashval)
517{
518 struct nfs4_client *clp;
519
520 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
521 if (same_name(clp->cl_recdir, dname))
522 return clp;
523 }
524 return NULL;
525}
526
527static struct nfs4_client *
528find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
529{
530 struct nfs4_client *clp;
531
532 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
533 if (same_name(clp->cl_recdir, dname))
534 return clp;
535 }
536 return NULL;
537}
538
1da177e4
LT		 539/* a helper function for parse_callback */
540static int
541parse_octet(unsigned int *lenp, char **addrp)
542{
543 unsigned int len = *lenp;
544 char *p = *addrp;
545 int n = -1;
546 char c;
547
548 for (;;) {
549 if (!len)
550 break;
551 len--;
552 c = *p++;
553 if (c == '.')
554 break;
555 if ((c < '0') || (c > '9')) {
556 n = -1;
557 break;
558 }
559 if (n < 0)
560 n = 0;
561 n = (n * 10) + (c - '0');
562 if (n > 255) {
563 n = -1;
564 break;
565 }
566 }
567 *lenp = len;
568 *addrp = p;
569 return n;
570}
571
572/* parse and set the setclientid ipv4 callback address */
fd39ca9a 573static int
1da177e4
LT		 574parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
575{
576 int temp = 0;
577 u32 cbaddr = 0;
578 u16 cbport = 0;
579 u32 addrlen = addr_len;
580 char *addr = addr_val;
581 int i, shift;
582
583 /* ipaddress */
584 shift = 24;
585 for(i = 4; i > 0 ; i--) {
586 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
587 return 0;
588 }
589 cbaddr |= (temp << shift);
590 if (shift > 0)
591 shift -= 8;
592 }
593 *cbaddrp = cbaddr;
594
595 /* port */
596 shift = 8;
597 for(i = 2; i > 0 ; i--) {
598 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
599 return 0;
600 }
601 cbport |= (temp << shift);
602 if (shift > 0)
603 shift -= 8;
604 }
605 *cbportp = cbport;
606 return 1;
607}
608
fd39ca9a 609static void
1da177e4
LT		 610gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
611{
612 struct nfs4_callback *cb = &clp->cl_callback;
613
614 /* Currently, we only support tcp for the callback channel */
615 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
616 goto out_err;
617
618 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
619 &cb->cb_addr, &cb->cb_port)))
620 goto out_err;
621 cb->cb_prog = se->se_callback_prog;
622 cb->cb_ident = se->se_callback_ident;
623 cb->cb_parsed = 1;
624 return;
625out_err:
626 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
627 "will not receive delegations\n",
628 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
629
630 cb->cb_parsed = 0;
631 return;
632}
633
634/*
635 * RFC 3010 has a complex implmentation description of processing a
636 * SETCLIENTID request consisting of 5 bullets, labeled as
637 * CASE0 - CASE4 below.
638 *
639 * NOTES:
640 * callback information will be processed in a future patch
641 *
642 * an unconfirmed record is added when:
643 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644 * CASE 1: confirmed record found with matching name, principal,
645 * verifier, and clientid.
646 * CASE 2: confirmed record found with matching name, principal,
647 * and there is no unconfirmed record with matching
648 * name and principal
649 *
650 * an unconfirmed record is replaced when:
651 * CASE 3: confirmed record found with matching name, principal,
652 * and an unconfirmed record is found with matching
653 * name, principal, and with clientid and
654 * confirm that does not match the confirmed record.
655 * CASE 4: there is no confirmed record with matching name and
656 * principal. there is an unconfirmed record with
657 * matching name, principal.
658 *
659 * an unconfirmed record is deleted when:
660 * CASE 1: an unconfirmed record that matches input name, verifier,
661 * and confirmed clientid.
662 * CASE 4: any unconfirmed records with matching name and principal
663 * that exist after an unconfirmed record has been replaced
664 * as described above.
665 *
666 */
667int
668nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669{
670 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671 struct xdr_netobj clname = {
672 .len = setclid->se_namelen,
673 .data = setclid->se_name,
674 };
675 nfs4_verifier clverifier = setclid->se_verf;
676 unsigned int strhashval;
28ce6054 677 struct nfs4_client *conf, *unconf, *new;
1da177e4 678 int status;
a55370a3 679 char dname[HEXDIR_LEN];
1da177e4
LT		 680
681 status = nfserr_inval;
682 if (!check_name(clname))
683 goto out;
684
a55370a3
N		 685 status = nfs4_make_rec_clidname(dname, &clname);
686 if (status)
687 goto out;
688
1da177e4
LT		 689 /*
690 * XXX The Duplicate Request Cache (DRC) has been checked (??)
691 * We get here on a DRC miss.
692 */
693
a55370a3 694 strhashval = clientstr_hashval(dname);
1da177e4 695
1da177e4 696 nfs4_lock_state();
28ce6054
N		 697 conf = find_confirmed_client_by_str(dname, strhashval);
698 if (conf) {
1da177e4
LT		 699 /*
700 * CASE 0:
701 * clname match, confirmed, different principal
702 * or different ip_address
703 */
704 status = nfserr_clid_inuse;
28ce6054
N		 705 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706 || conf->cl_addr != ip_addr) {
1da177e4
LT		 707 printk("NFSD: setclientid: string in use by client"
708 "(clientid %08x/%08x)\n",
28ce6054 709 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 710 goto out;
711 }
1da177e4 712 }
28ce6054 713 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 714 status = nfserr_resource;
715 if (!conf) {
716 /*
717 * CASE 4:
718 * placed first, because it is the normal case.
719 */
720 if (unconf)
721 expire_client(unconf);
a55370a3
N		 722 new = create_client(clname, dname);
723 if (new == NULL)
1da177e4
LT		 724 goto out;
725 copy_verf(new, &clverifier);
726 new->cl_addr = ip_addr;
727 copy_cred(&new->cl_cred,&rqstp->rq_cred);
728 gen_clid(new);
729 gen_confirm(new);
730 gen_callback(new, setclid);
731 add_to_unconfirmed(new, strhashval);
732 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
733 /*
734 * CASE 1:
735 * cl_name match, confirmed, principal match
736 * verifier match: probable callback update
737 *
738 * remove any unconfirmed nfs4_client with
739 * matching cl_name, cl_verifier, and cl_clientid
740 *
741 * create and insert an unconfirmed nfs4_client with same
742 * cl_name, cl_verifier, and cl_clientid as existing
743 * nfs4_client, but with the new callback info and a
744 * new cl_confirm
745 */
31f4a6c1
N		 746 if (unconf) {
747 /* Note this is removing unconfirmed {*x***},
748 * which is stronger than RFC recommended {vxc**}.
749 * This has the advantage that there is at most
750 * one {*x***} in either list at any time.
751 */
752 expire_client(unconf);
1da177e4 753 }
a55370a3
N		 754 new = create_client(clname, dname);
755 if (new == NULL)
1da177e4
LT		 756 goto out;
757 copy_verf(new,&conf->cl_verifier);
758 new->cl_addr = ip_addr;
759 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760 copy_clid(new, conf);
761 gen_confirm(new);
762 gen_callback(new, setclid);
763 add_to_unconfirmed(new,strhashval);
764 } else if (!unconf) {
765 /*
766 * CASE 2:
767 * clname match, confirmed, principal match
768 * verfier does not match
769 * no unconfirmed. create a new unconfirmed nfs4_client
770 * using input clverifier, clname, and callback info
771 * and generate a new cl_clientid and cl_confirm.
772 */
a55370a3
N		 773 new = create_client(clname, dname);
774 if (new == NULL)
1da177e4
LT		 775 goto out;
776 copy_verf(new,&clverifier);
777 new->cl_addr = ip_addr;
778 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779 gen_clid(new);
780 gen_confirm(new);
781 gen_callback(new, setclid);
782 add_to_unconfirmed(new, strhashval);
783 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
784 /*
785 * CASE3:
786 * confirmed found (name, principal match)
787 * confirmed verifier does not match input clverifier
788 *
789 * unconfirmed found (name match)
790 * confirmed->cl_confirm != unconfirmed->cl_confirm
791 *
792 * remove unconfirmed.
793 *
794 * create an unconfirmed nfs4_client
795 * with same cl_name as existing confirmed nfs4_client,
796 * but with new callback info, new cl_clientid,
797 * new cl_verifier and a new cl_confirm
798 */
799 expire_client(unconf);
a55370a3
N		 800 new = create_client(clname, dname);
801 if (new == NULL)
1da177e4
LT		 802 goto out;
803 copy_verf(new,&clverifier);
804 new->cl_addr = ip_addr;
805 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806 gen_clid(new);
807 gen_confirm(new);
808 gen_callback(new, setclid);
809 add_to_unconfirmed(new, strhashval);
810 } else {
811 /* No cases hit !!! */
812 status = nfserr_inval;
813 goto out;
814
815 }
816 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
817 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
818 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
819 status = nfs_ok;
820out:
821 nfs4_unlock_state();
822 return status;
823}
824
825
826/*
827 * RFC 3010 has a complex implmentation description of processing a
828 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
829 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
830 *
831 * NOTE: callback information will be processed here in a future patch
832 */
833int
834nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
835{
836 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
837 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
838 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
839 clientid_t * clid = &setclientid_confirm->sc_clientid;
840 int status;
841
842 if (STALE_CLIENTID(clid))
843 return nfserr_stale_clientid;
844 /*
845 * XXX The Duplicate Request Cache (DRC) has been checked (??)
846 * We get here on a DRC miss.
847 */
848
849 nfs4_lock_state();
850 clp = find_confirmed_client(clid);
851 if (clp) {
22de4d83 852 status = nfserr_clid_inuse;
1da177e4
LT		 853 if (clp->cl_addr != ip_addr) {
854 printk("NFSD: setclientid: string in use by client"
855 "(clientid %08x/%08x)\n",
856 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
857 goto out;
858 }
859 conf = clp;
860 }
861 clp = find_unconfirmed_client(clid);
862 if (clp) {
22de4d83 863 status = nfserr_clid_inuse;
1da177e4
LT		 864 if (clp->cl_addr != ip_addr) {
865 printk("NFSD: setclientid: string in use by client"
866 "(clientid %08x/%08x)\n",
867 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
868 goto out;
869 }
870 unconf = clp;
871 }
1da177e4
LT		 872 if ((conf && unconf) &&
873 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
874 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 875 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 876 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 877 /* CASE 1:
878 * unconf record that matches input clientid and input confirm.
879 * conf record that matches input clientid.
880 * conf and unconf records match names, verifiers
881 */
1da177e4
LT		 882 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
883 status = nfserr_clid_inuse;
884 else {
1a69c179
N		 885 /* XXX: We just turn off callbacks until we can handle
886 * change request correctly. */
887 clp = conf;
888 clp->cl_callback.cb_parsed = 0;
889 gen_confirm(clp);
890 expire_client(unconf);
1da177e4 891 status = nfs_ok;
1a69c179 892
1da177e4 893 }
7c79f737 894 } else if ((conf && !unconf) ||
1da177e4
LT		 895 ((conf && unconf) &&
896 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 897 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 898 /* CASE 2:
899 * conf record that matches input clientid.
900 * if unconf record matches input clientid, then
901 * unconf->cl_name or unconf->cl_verifier don't match the
902 * conf record.
903 */
1da177e4
LT		 904 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
905 status = nfserr_clid_inuse;
906 } else {
907 clp = conf;
908 status = nfs_ok;
909 }
7c79f737
N		 910 } else if (!conf && unconf
911 && cmp_verf(&unconf->cl_confirm, &confirm)) {
912 /* CASE 3:
913 * conf record not found.
914 * unconf record found.
915 * unconf->cl_confirm matches input confirm
916 */
1da177e4
LT		 917 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
918 status = nfserr_clid_inuse;
919 } else {
1a69c179
N		 920 unsigned int hash =
921 clientstr_hashval(unconf->cl_recdir);
922 conf = find_confirmed_client_by_str(unconf->cl_recdir,
923 hash);
924 if (conf) {
925 expire_client(conf);
926 }
1da177e4
LT		 927 clp = unconf;
928 move_to_confirmed(unconf);
1a69c179 929 status = nfs_ok;
1da177e4 930 }
7c79f737
N		 931 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
932 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
933 &confirm)))) {
934 /* CASE 4:
935 * conf record not found, or if conf, conf->cl_confirm does not
936 * match input confirm.
937 * unconf record not found, or if unconf, unconf->cl_confirm
938 * does not match input confirm.
939 */
1da177e4 940 status = nfserr_stale_clientid;
7c79f737 941 } else {
08e8987c
N		 942 /* check that we have hit one of the cases...*/
943 status = nfserr_clid_inuse;
944 }
1da177e4
LT		 945out:
946 if (!status)
947 nfsd4_probe_callback(clp);
948 nfs4_unlock_state();
949 return status;
950}
951
952/*
953 * Open owner state (share locks)
954 */
955
956/* hash tables for nfs4_stateowner */
957#define OWNER_HASH_BITS 8
958#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
959#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
960
961#define ownerid_hashval(id) \
962 ((id) & OWNER_HASH_MASK)
963#define ownerstr_hashval(clientid, ownername) \
964 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
965
966static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
967static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
968
969/* hash table for nfs4_file */
970#define FILE_HASH_BITS 8
971#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
972#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
973/* hash table for (open)nfs4_stateid */
974#define STATEID_HASH_BITS 10
975#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
976#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
977
978#define file_hashval(x) \
979 hash_ptr(x, FILE_HASH_BITS)
980#define stateid_hashval(owner_id, file_id) \
981 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
982
983static struct list_head file_hashtbl[FILE_HASH_SIZE];
984static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
985
986/* OPEN Share state helper functions */
987static inline struct nfs4_file *
988alloc_init_file(struct inode *ino)
989{
990 struct nfs4_file *fp;
991 unsigned int hashval = file_hashval(ino);
992
e60d4398
N		 993 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
994 if (fp) {
13cd2184 995 kref_init(&fp->fi_ref);
1da177e4 996 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 997 INIT_LIST_HEAD(&fp->fi_stateids);
998 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 999 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1000 fp->fi_inode = igrab(ino);
1001 fp->fi_id = current_fileid++;
1da177e4
LT		 1002 return fp;
1003 }
1004 return NULL;
1005}
1006
e60d4398
N		 1007static void
1008nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 1009{
e60d4398
N		 1010 int status;
1011
1012 if (*slab == NULL)
1013 return;
1014 status = kmem_cache_destroy(*slab);
1015 *slab = NULL;
1016 WARN_ON(status);
1da177e4
LT		 1017}
1018
1019static void
1020nfsd4_free_slabs(void)
1021{
e60d4398
N		 1022 nfsd4_free_slab(&stateowner_slab);
1023 nfsd4_free_slab(&file_slab);
5ac049ac 1024 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1025 nfsd4_free_slab(&deleg_slab);
e60d4398 1026}
1da177e4 1027
e60d4398
N		 1028static int
1029nfsd4_init_slabs(void)
1030{
1031 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1032 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1033 if (stateowner_slab == NULL)
1034 goto out_nomem;
1035 file_slab = kmem_cache_create("nfsd4_files",
1036 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1037 if (file_slab == NULL)
1038 goto out_nomem;
5ac049ac
N		 1039 stateid_slab = kmem_cache_create("nfsd4_stateids",
1040 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1041 if (stateid_slab == NULL)
1042 goto out_nomem;
5b2d21c1
N		 1043 deleg_slab = kmem_cache_create("nfsd4_delegations",
1044 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1045 if (deleg_slab == NULL)
1046 goto out_nomem;
e60d4398
N		 1047 return 0;
1048out_nomem:
1049 nfsd4_free_slabs();
1050 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1051 return -ENOMEM;
1da177e4
LT		 1052}
1053
1054void
1055nfs4_free_stateowner(struct kref *kref)
1056{
1057 struct nfs4_stateowner *sop =
1058 container_of(kref, struct nfs4_stateowner, so_ref);
1059 kfree(sop->so_owner.data);
1060 kmem_cache_free(stateowner_slab, sop);
1061}
1062
1063static inline struct nfs4_stateowner *
1064alloc_stateowner(struct xdr_netobj *owner)
1065{
1066 struct nfs4_stateowner *sop;
1067
1068 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1069 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1070 memcpy(sop->so_owner.data, owner->data, owner->len);
1071 sop->so_owner.len = owner->len;
1072 kref_init(&sop->so_ref);
1073 return sop;
1074 }
1075 kmem_cache_free(stateowner_slab, sop);
1076 }
1077 return NULL;
1078}
1079
1080static struct nfs4_stateowner *
1081alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1082 struct nfs4_stateowner *sop;
1083 struct nfs4_replay *rp;
1084 unsigned int idhashval;
1085
1086 if (!(sop = alloc_stateowner(&open->op_owner)))
1087 return NULL;
1088 idhashval = ownerid_hashval(current_ownerid);
1089 INIT_LIST_HEAD(&sop->so_idhash);
1090 INIT_LIST_HEAD(&sop->so_strhash);
1091 INIT_LIST_HEAD(&sop->so_perclient);
1092 INIT_LIST_HEAD(&sop->so_perfilestate);
1093 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1094 INIT_LIST_HEAD(&sop->so_close_lru);
1095 sop->so_time = 0;
1096 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1097 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1098 list_add(&sop->so_perclient, &clp->cl_perclient);
1da177e4
LT		 1099 sop->so_is_open_owner = 1;
1100 sop->so_id = current_ownerid++;
1101 sop->so_client = clp;
1102 sop->so_seqid = open->op_seqid;
1103 sop->so_confirmed = 0;
1104 rp = &sop->so_replay;
1105 rp->rp_status = NFSERR_SERVERFAULT;
1106 rp->rp_buflen = 0;
1107 rp->rp_buf = rp->rp_ibuf;
1108 return sop;
1109}
1110
1111static void
1112release_stateid_lockowners(struct nfs4_stateid *open_stp)
1113{
1114 struct nfs4_stateowner *lock_sop;
1115
1116 while (!list_empty(&open_stp->st_perlockowner)) {
1117 lock_sop = list_entry(open_stp->st_perlockowner.next,
1118 struct nfs4_stateowner, so_perlockowner);
1119 /* list_del(&open_stp->st_perlockowner); */
1120 BUG_ON(lock_sop->so_is_open_owner);
1121 release_stateowner(lock_sop);
1122 }
1123}
1124
1125static void
1126unhash_stateowner(struct nfs4_stateowner *sop)
1127{
1128 struct nfs4_stateid *stp;
1129
1130 list_del(&sop->so_idhash);
1131 list_del(&sop->so_strhash);
6fa305de 1132 if (sop->so_is_open_owner)
1da177e4 1133 list_del(&sop->so_perclient);
1da177e4
LT		 1134 list_del(&sop->so_perlockowner);
1135 while (!list_empty(&sop->so_perfilestate)) {
1136 stp = list_entry(sop->so_perfilestate.next,
1137 struct nfs4_stateid, st_perfilestate);
1138 if (sop->so_is_open_owner)
1139 release_stateid(stp, OPEN_STATE);
1140 else
1141 release_stateid(stp, LOCK_STATE);
1142 }
1143}
1144
1145static void
1146release_stateowner(struct nfs4_stateowner *sop)
1147{
1148 unhash_stateowner(sop);
1149 list_del(&sop->so_close_lru);
1150 nfs4_put_stateowner(sop);
1151}
1152
1153static inline void
1154init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1155 struct nfs4_stateowner *sop = open->op_stateowner;
1156 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1157
1158 INIT_LIST_HEAD(&stp->st_hash);
1159 INIT_LIST_HEAD(&stp->st_perfilestate);
1160 INIT_LIST_HEAD(&stp->st_perlockowner);
1161 INIT_LIST_HEAD(&stp->st_perfile);
1162 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1163 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
8beefa24 1164 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1165 stp->st_stateowner = sop;
13cd2184 1166 get_nfs4_file(fp);
1da177e4
LT		 1167 stp->st_file = fp;
1168 stp->st_stateid.si_boot = boot_time;
1169 stp->st_stateid.si_stateownerid = sop->so_id;
1170 stp->st_stateid.si_fileid = fp->fi_id;
1171 stp->st_stateid.si_generation = 0;
1172 stp->st_access_bmap = 0;
1173 stp->st_deny_bmap = 0;
1174 __set_bit(open->op_share_access, &stp->st_access_bmap);
1175 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1176}
1177
1178static void
1179release_stateid(struct nfs4_stateid *stp, int flags)
1180{
1181 struct file *filp = stp->st_vfs_file;
1182
1183 list_del(&stp->st_hash);
1da177e4
LT		 1184 list_del(&stp->st_perfile);
1185 list_del(&stp->st_perfilestate);
1186 if (flags & OPEN_STATE) {
1187 release_stateid_lockowners(stp);
1188 stp->st_vfs_file = NULL;
1189 nfsd_close(filp);
1da177e4
LT		 1190 } else if (flags & LOCK_STATE)
1191 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1192 put_nfs4_file(stp->st_file);
5ac049ac 1193 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1194 stp = NULL;
1195}
1196
fd39ca9a 1197static void
1da177e4
LT		 1198move_to_close_lru(struct nfs4_stateowner *sop)
1199{
1200 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1201
1202 unhash_stateowner(sop);
1203 list_add_tail(&sop->so_close_lru, &close_lru);
1204 sop->so_time = get_seconds();
1205}
1206
fd39ca9a 1207static void
1da177e4
LT		 1208release_state_owner(struct nfs4_stateid *stp, int flag)
1209{
1210 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1211
1212 dprintk("NFSD: release_state_owner\n");
1213 release_stateid(stp, flag);
1214
1215 /* place unused nfs4_stateowners on so_close_lru list to be
1216 * released by the laundromat service after the lease period
1217 * to enable us to handle CLOSE replay
1218 */
1219 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1220 move_to_close_lru(sop);
1da177e4
LT		 1221}
1222
1223static int
1224cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1225 return ((sop->so_owner.len == owner->len) &&
1226 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1227 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1228}
1229
1230static struct nfs4_stateowner *
1231find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1232{
1233 struct nfs4_stateowner *so = NULL;
1234
1235 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1236 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1237 return so;
1238 }
1239 return NULL;
1240}
1241
1242/* search file_hashtbl[] for file */
1243static struct nfs4_file *
1244find_file(struct inode *ino)
1245{
1246 unsigned int hashval = file_hashval(ino);
1247 struct nfs4_file *fp;
1248
1249 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1250 if (fp->fi_inode == ino) {
1251 get_nfs4_file(fp);
1da177e4 1252 return fp;
13cd2184 1253 }
1da177e4
LT		 1254 }
1255 return NULL;
1256}
1257
1258#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1259#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1260
fd39ca9a 1261static void
1da177e4
LT		 1262set_access(unsigned int *access, unsigned long bmap) {
1263 int i;
1264
1265 *access = 0;
1266 for (i = 1; i < 4; i++) {
1267 if (test_bit(i, &bmap))
1268 *access |= i;
1269 }
1270}
1271
fd39ca9a 1272static void
1da177e4
LT		 1273set_deny(unsigned int *deny, unsigned long bmap) {
1274 int i;
1275
1276 *deny = 0;
1277 for (i = 0; i < 4; i++) {
1278 if (test_bit(i, &bmap))
1279 *deny |= i ;
1280 }
1281}
1282
1283static int
1284test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1285 unsigned int access, deny;
1286
1287 set_access(&access, stp->st_access_bmap);
1288 set_deny(&deny, stp->st_deny_bmap);
1289 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1290 return 0;
1291 return 1;
1292}
1293
1294/*
1295 * Called to check deny when READ with all zero stateid or
1296 * WRITE with all zero or all one stateid
1297 */
fd39ca9a 1298static int
1da177e4
LT		 1299nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1300{
1301 struct inode *ino = current_fh->fh_dentry->d_inode;
1302 struct nfs4_file *fp;
1303 struct nfs4_stateid *stp;
13cd2184 1304 int ret;
1da177e4
LT		 1305
1306 dprintk("NFSD: nfs4_share_conflict\n");
1307
1308 fp = find_file(ino);
13cd2184
N		 1309 if (!fp)
1310 return nfs_ok;
1311 ret = nfserr_share_denied;
1da177e4 1312 /* Search for conflicting share reservations */
13cd2184
N		 1313 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1314 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1315 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1316 goto out;
1da177e4 1317 }
13cd2184
N		 1318 ret = nfs_ok;
1319out:
1320 put_nfs4_file(fp);
1321 return ret;
1da177e4
LT		 1322}
1323
1324static inline void
1325nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1326{
1327 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1328 put_write_access(filp->f_dentry->d_inode);
1329 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1330 }
1331}
1332
1333/*
1334 * Recall a delegation
1335 */
1336static int
1337do_recall(void *__dp)
1338{
1339 struct nfs4_delegation *dp = __dp;
1340
1341 daemonize("nfsv4-recall");
1342
1343 nfsd4_cb_recall(dp);
1344 return 0;
1345}
1346
1347/*
1348 * Spawn a thread to perform a recall on the delegation represented
1349 * by the lease (file_lock)
1350 *
1351 * Called from break_lease() with lock_kernel() held.
1352 * Note: we assume break_lease will only call this *once* for any given
1353 * lease.
1354 */
1355static
1356void nfsd_break_deleg_cb(struct file_lock *fl)
1357{
1358 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1359 struct task_struct *t;
1360
1361 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1362 if (!dp)
1363 return;
1364
1365 /* We're assuming the state code never drops its reference
1366 * without first removing the lease. Since we're in this lease
1367 * callback (and since the lease code is serialized by the kernel
1368 * lock) we know the server hasn't removed the lease yet, we know
1369 * it's safe to take a reference: */
1370 atomic_inc(&dp->dl_count);
1371
1372 spin_lock(&recall_lock);
1373 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1374 spin_unlock(&recall_lock);
1375
1376 /* only place dl_time is set. protected by lock_kernel*/
1377 dp->dl_time = get_seconds();
1378
1379 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1380 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1381
1382 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1383 if (IS_ERR(t)) {
1384 struct nfs4_client *clp = dp->dl_client;
1385
1386 printk(KERN_INFO "NFSD: Callback thread failed for "
1387 "for client (clientid %08x/%08x)\n",
1388 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1389 nfs4_put_delegation(dp);
1390 }
1391}
1392
1393/*
1394 * The file_lock is being reapd.
1395 *
1396 * Called by locks_free_lock() with lock_kernel() held.
1397 */
1398static
1399void nfsd_release_deleg_cb(struct file_lock *fl)
1400{
1401 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1402
1403 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1404
1405 if (!(fl->fl_flags & FL_LEASE) || !dp)
1406 return;
1407 dp->dl_flock = NULL;
1408}
1409
1410/*
1411 * Set the delegation file_lock back pointer.
1412 *
1413 * Called from __setlease() with lock_kernel() held.
1414 */
1415static
1416void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1417{
1418 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1419
1420 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1421 if (!dp)
1422 return;
1423 dp->dl_flock = new;
1424}
1425
1426/*
1427 * Called from __setlease() with lock_kernel() held
1428 */
1429static
1430int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1431{
1432 struct nfs4_delegation *onlistd =
1433 (struct nfs4_delegation *)onlist->fl_owner;
1434 struct nfs4_delegation *tryd =
1435 (struct nfs4_delegation *)try->fl_owner;
1436
1437 if (onlist->fl_lmops != try->fl_lmops)
1438 return 0;
1439
1440 return onlistd->dl_client == tryd->dl_client;
1441}
1442
1443
1444static
1445int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1446{
1447 if (arg & F_UNLCK)
1448 return lease_modify(onlist, arg);
1449 else
1450 return -EAGAIN;
1451}
1452
fd39ca9a 1453static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1454 .fl_break = nfsd_break_deleg_cb,
1455 .fl_release_private = nfsd_release_deleg_cb,
1456 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1457 .fl_mylease = nfsd_same_client_deleg_cb,
1458 .fl_change = nfsd_change_deleg_cb,
1459};
1460
1461
1462/*
1463 * nfsd4_process_open1()
1464 * lookup stateowner.
1465 * found:
1466 * check confirmed
1467 * confirmed:
1468 * check seqid
1469 * not confirmed:
1470 * delete owner
1471 * create new owner
1472 * notfound:
1473 * verify clientid
1474 * create new owner
1475 *
1476 * called with nfs4_lock_state() held.
1477 */
1478int
1479nfsd4_process_open1(struct nfsd4_open *open)
1480{
1481 int status;
1482 clientid_t *clientid = &open->op_clientid;
1483 struct nfs4_client *clp = NULL;
1484 unsigned int strhashval;
1485 struct nfs4_stateowner *sop = NULL;
1486
1487 status = nfserr_inval;
1488 if (!check_name(open->op_owner))
1489 goto out;
1490
1491 if (STALE_CLIENTID(&open->op_clientid))
1492 return nfserr_stale_clientid;
1493
1494 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1495 sop = find_openstateowner_str(strhashval, open);
1496 if (sop) {
1497 open->op_stateowner = sop;
1498 /* check for replay */
1499 if (open->op_seqid == sop->so_seqid){
1500 if (sop->so_replay.rp_buflen)
1501 return NFSERR_REPLAY_ME;
1502 else {
1503 /* The original OPEN failed so spectacularly
1504 * that we don't even have replay data saved!
1505 * Therefore, we have no choice but to continue
1506 * processing this OPEN; presumably, we'll
1507 * fail again for the same reason.
1508 */
1509 dprintk("nfsd4_process_open1:"
1510 " replay with no replay cache\n");
1511 goto renew;
1512 }
1513 } else if (sop->so_confirmed) {
1514 if (open->op_seqid == sop->so_seqid + 1)
1515 goto renew;
1516 status = nfserr_bad_seqid;
1517 goto out;
1518 } else {
1519 /* If we get here, we received an OPEN for an
1520 * unconfirmed nfs4_stateowner. Since the seqid's are
1521 * different, purge the existing nfs4_stateowner, and
1522 * instantiate a new one.
1523 */
1524 clp = sop->so_client;
1525 release_stateowner(sop);
1526 }
1527 } else {
1528 /* nfs4_stateowner not found.
1529 * Verify clientid and instantiate new nfs4_stateowner.
1530 * If verify fails this is presumably the result of the
1531 * client's lease expiring.
1532 */
1533 status = nfserr_expired;
1534 clp = find_confirmed_client(clientid);
1535 if (clp == NULL)
1536 goto out;
1537 }
1538 status = nfserr_resource;
1539 sop = alloc_init_open_stateowner(strhashval, clp, open);
1540 if (sop == NULL)
1541 goto out;
1542 open->op_stateowner = sop;
1543renew:
1544 status = nfs_ok;
1545 renew_client(sop->so_client);
1546out:
1547 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1548 status = nfserr_reclaim_bad;
1549 return status;
1550}
1551
4a6e43e6
N		 1552static inline int
1553nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1554{
1555 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1556 return nfserr_openmode;
1557 else
1558 return nfs_ok;
1559}
1560
52f4fb43
N		 1561static struct nfs4_delegation *
1562find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1563{
1564 struct nfs4_delegation *dp;
1565
8beefa24 1566 list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
52f4fb43
N		 1567 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1568 return dp;
1569 }
1570 return NULL;
1571}
1572
c44c5eeb 1573static int
567d9829
N		 1574nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1575 struct nfs4_delegation **dp)
1576{
1577 int flags;
c44c5eeb 1578 int status = nfserr_bad_stateid;
567d9829
N		 1579
1580 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1581 if (*dp == NULL)
c44c5eeb 1582 goto out;
567d9829
N		 1583 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1584 RD_STATE : WR_STATE;
1585 status = nfs4_check_delegmode(*dp, flags);
1586 if (status)
1587 *dp = NULL;
c44c5eeb
N		 1588out:
1589 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1590 return nfs_ok;
1591 if (status)
1592 return status;
1593 open->op_stateowner->so_confirmed = 1;
1594 return nfs_ok;
567d9829
N		 1595}
1596
1da177e4
LT		 1597static int
1598nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1599{
1600 struct nfs4_stateid *local;
1601 int status = nfserr_share_denied;
1602 struct nfs4_stateowner *sop = open->op_stateowner;
1603
8beefa24 1604 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1605 /* ignore lock owners */
1606 if (local->st_stateowner->so_is_open_owner == 0)
1607 continue;
1608 /* remember if we have seen this open owner */
1609 if (local->st_stateowner == sop)
1610 *stpp = local;
1611 /* check for conflicting share reservations */
1612 if (!test_share(local, open))
1613 goto out;
1614 }
1615 status = 0;
1616out:
1617 return status;
1618}
1619
5ac049ac
N		 1620static inline struct nfs4_stateid *
1621nfs4_alloc_stateid(void)
1622{
1623 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1624}
1625
1da177e4
LT		 1626static int
1627nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1628 struct nfs4_delegation *dp,
1da177e4
LT		 1629 struct svc_fh *cur_fh, int flags)
1630{
1631 struct nfs4_stateid *stp;
1da177e4 1632
5ac049ac 1633 stp = nfs4_alloc_stateid();
1da177e4
LT		 1634 if (stp == NULL)
1635 return nfserr_resource;
1636
567d9829
N		 1637 if (dp) {
1638 get_file(dp->dl_vfs_file);
1639 stp->st_vfs_file = dp->dl_vfs_file;
1640 } else {
1641 int status;
1642 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1643 &stp->st_vfs_file);
1644 if (status) {
1645 if (status == nfserr_dropit)
1646 status = nfserr_jukebox;
5ac049ac 1647 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1648 return status;
1649 }
1da177e4 1650 }
1da177e4
LT		 1651 *stpp = stp;
1652 return 0;
1653}
1654
1655static inline int
1656nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1657 struct nfsd4_open *open)
1658{
1659 struct iattr iattr = {
1660 .ia_valid = ATTR_SIZE,
1661 .ia_size = 0,
1662 };
1663 if (!open->op_truncate)
1664 return 0;
1665 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1666 return -EINVAL;
1667 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1668}
1669
1670static int
1671nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1672{
1673 struct file *filp = stp->st_vfs_file;
1674 struct inode *inode = filp->f_dentry->d_inode;
1675 unsigned int share_access;
1676 int status;
1677
1678 set_access(&share_access, stp->st_access_bmap);
1679 share_access = ~share_access;
1680 share_access &= open->op_share_access;
1681
1682 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1683 return nfsd4_truncate(rqstp, cur_fh, open);
1684
1685 status = get_write_access(inode);
1686 if (status)
1687 return nfserrno(status);
1688 status = nfsd4_truncate(rqstp, cur_fh, open);
1689 if (status) {
1690 put_write_access(inode);
1691 return status;
1692 }
1693 /* remember the open */
1694 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1695 set_bit(open->op_share_access, &stp->st_access_bmap);
1696 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1697
1698 return nfs_ok;
1699}
1700
1701
1702/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1703static void
1704nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1705{
1706 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1707 if (*status)
1708 *status = nfserr_reclaim_bad;
1709 else {
1710 open->op_stateowner->so_confirmed = 1;
1711 open->op_stateowner->so_seqid--;
1712 }
1713 }
1714}
1715
1716/*
1717 * Attempt to hand out a delegation.
1718 */
1719static void
1720nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1721{
1722 struct nfs4_delegation *dp;
1723 struct nfs4_stateowner *sop = stp->st_stateowner;
1724 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1725 struct file_lock fl, *flp = &fl;
1726 int status, flag = 0;
1727
1728 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1729 open->op_recall = 0;
1730 switch (open->op_claim_type) {
1731 case NFS4_OPEN_CLAIM_PREVIOUS:
1732 if (!atomic_read(&cb->cb_set))
1733 open->op_recall = 1;
1734 flag = open->op_delegate_type;
1735 if (flag == NFS4_OPEN_DELEGATE_NONE)
1736 goto out;
1737 break;
1738 case NFS4_OPEN_CLAIM_NULL:
1739 /* Let's not give out any delegations till everyone's
1740 * had the chance to reclaim theirs.... */
1741 if (nfs4_in_grace())
1742 goto out;
1743 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1744 goto out;
1745 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1746 flag = NFS4_OPEN_DELEGATE_WRITE;
1747 else
1748 flag = NFS4_OPEN_DELEGATE_READ;
1749 break;
1750 default:
1751 goto out;
1752 }
1da177e4
LT		 1753
1754 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1755 if (dp == NULL) {
1756 flag = NFS4_OPEN_DELEGATE_NONE;
1757 goto out;
1758 }
1759 locks_init_lock(&fl);
1760 fl.fl_lmops = &nfsd_lease_mng_ops;
1761 fl.fl_flags = FL_LEASE;
1762 fl.fl_end = OFFSET_MAX;
1763 fl.fl_owner = (fl_owner_t)dp;
1764 fl.fl_file = stp->st_vfs_file;
1765 fl.fl_pid = current->tgid;
1766
1767 /* setlease checks to see if delegation should be handed out.
1768 * the lock_manager callbacks fl_mylease and fl_change are used
1769 */
1770 if ((status = setlease(stp->st_vfs_file,
1771 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1772 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1773 unhash_delegation(dp);
1da177e4
LT		 1774 flag = NFS4_OPEN_DELEGATE_NONE;
1775 goto out;
1776 }
1777
1778 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1779
1780 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1781 dp->dl_stateid.si_boot,
1782 dp->dl_stateid.si_stateownerid,
1783 dp->dl_stateid.si_fileid,
1784 dp->dl_stateid.si_generation);
1785out:
7b190fec
N		 1786 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1787 && flag == NFS4_OPEN_DELEGATE_NONE
1788 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1789 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1790 open->op_delegate_type = flag;
1791}
1792
1793/*
1794 * called with nfs4_lock_state() held.
1795 */
1796int
1797nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1798{
1799 struct nfs4_file *fp = NULL;
1800 struct inode *ino = current_fh->fh_dentry->d_inode;
1801 struct nfs4_stateid *stp = NULL;
567d9829 1802 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1803 int status;
1804
1805 status = nfserr_inval;
1806 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1807 goto out;
1808 /*
1809 * Lookup file; if found, lookup stateid and check open request,
1810 * and check for delegations in the process of being recalled.
1811 * If not found, create the nfs4_file struct
1812 */
1813 fp = find_file(ino);
1814 if (fp) {
1815 if ((status = nfs4_check_open(fp, open, &stp)))
1816 goto out;
c44c5eeb
N		 1817 status = nfs4_check_deleg(fp, open, &dp);
1818 if (status)
1819 goto out;
1da177e4 1820 } else {
c44c5eeb
N		 1821 status = nfserr_bad_stateid;
1822 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1823 goto out;
1da177e4
LT		 1824 status = nfserr_resource;
1825 fp = alloc_init_file(ino);
1826 if (fp == NULL)
1827 goto out;
1828 }
1829
1830 /*
1831 * OPEN the file, or upgrade an existing OPEN.
1832 * If truncate fails, the OPEN fails.
1833 */
1834 if (stp) {
1835 /* Stateid was found, this is an OPEN upgrade */
1836 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1837 if (status)
1838 goto out;
1839 } else {
1840 /* Stateid was not found, this is a new OPEN */
1841 int flags = 0;
1842 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1843 flags = MAY_WRITE;
1844 else
1845 flags = MAY_READ;
567d9829
N		 1846 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1847 if (status)
1da177e4
LT		 1848 goto out;
1849 init_stateid(stp, fp, open);
1850 status = nfsd4_truncate(rqstp, current_fh, open);
1851 if (status) {
1852 release_stateid(stp, OPEN_STATE);
1853 goto out;
1854 }
1855 }
1856 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1857
1858 /*
1859 * Attempt to hand out a delegation. No error return, because the
1860 * OPEN succeeds even if we fail.
1861 */
1862 nfs4_open_delegation(current_fh, open, stp);
1863
1864 status = nfs_ok;
1865
1866 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1867 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1868 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1869out:
13cd2184
N		 1870 if (fp)
1871 put_nfs4_file(fp);
1da177e4
LT		 1872 /* CLAIM_PREVIOUS has different error returns */
1873 nfs4_set_claim_prev(open, &status);
1874 /*
1875 * To finish the open response, we just need to set the rflags.
1876 */
1877 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1878 if (!open->op_stateowner->so_confirmed)
1879 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1880
1881 return status;
1882}
1883
58da282b 1884static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1885static struct work_struct laundromat_work;
1886static void laundromat_main(void *);
1887static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1888
1889int
1890nfsd4_renew(clientid_t *clid)
1891{
1892 struct nfs4_client *clp;
1893 int status;
1894
1895 nfs4_lock_state();
1896 dprintk("process_renew(%08x/%08x): starting\n",
1897 clid->cl_boot, clid->cl_id);
1898 status = nfserr_stale_clientid;
1899 if (STALE_CLIENTID(clid))
1900 goto out;
1901 clp = find_confirmed_client(clid);
1902 status = nfserr_expired;
1903 if (clp == NULL) {
1904 /* We assume the client took too long to RENEW. */
1905 dprintk("nfsd4_renew: clientid not found!\n");
1906 goto out;
1907 }
1908 renew_client(clp);
1909 status = nfserr_cb_path_down;
1910 if (!list_empty(&clp->cl_del_perclnt)
1911 && !atomic_read(&clp->cl_callback.cb_set))
1912 goto out;
1913 status = nfs_ok;
1914out:
1915 nfs4_unlock_state();
1916 return status;
1917}
1918
a76b4319
N		 1919static void
1920end_grace(void)
1921{
1922 dprintk("NFSD: end of grace period\n");
1923 in_grace = 0;
1924}
1925
fd39ca9a 1926static time_t
1da177e4
LT		 1927nfs4_laundromat(void)
1928{
1929 struct nfs4_client *clp;
1930 struct nfs4_stateowner *sop;
1931 struct nfs4_delegation *dp;
1932 struct list_head *pos, *next, reaplist;
1933 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1934 time_t t, clientid_val = NFSD_LEASE_TIME;
1935 time_t u, test_val = NFSD_LEASE_TIME;
1936
1937 nfs4_lock_state();
1938
1939 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1940 if (in_grace)
1941 end_grace();
1da177e4
LT		 1942 list_for_each_safe(pos, next, &client_lru) {
1943 clp = list_entry(pos, struct nfs4_client, cl_lru);
1944 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1945 t = clp->cl_time - cutoff;
1946 if (clientid_val > t)
1947 clientid_val = t;
1948 break;
1949 }
1950 dprintk("NFSD: purging unused client (clientid %08x)\n",
1951 clp->cl_clientid.cl_id);
1952 expire_client(clp);
1953 }
1954 INIT_LIST_HEAD(&reaplist);
1955 spin_lock(&recall_lock);
1956 list_for_each_safe(pos, next, &del_recall_lru) {
1957 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1958 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1959 u = dp->dl_time - cutoff;
1960 if (test_val > u)
1961 test_val = u;
1962 break;
1963 }
1964 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1965 dp, dp->dl_flock);
1966 list_move(&dp->dl_recall_lru, &reaplist);
1967 }
1968 spin_unlock(&recall_lock);
1969 list_for_each_safe(pos, next, &reaplist) {
1970 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1971 list_del_init(&dp->dl_recall_lru);
1972 unhash_delegation(dp);
1973 }
1974 test_val = NFSD_LEASE_TIME;
1975 list_for_each_safe(pos, next, &close_lru) {
1976 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1977 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1978 u = sop->so_time - cutoff;
1979 if (test_val > u)
1980 test_val = u;
1981 break;
1982 }
1983 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1984 sop->so_id);
1985 list_del(&sop->so_close_lru);
1986 nfs4_put_stateowner(sop);
1987 }
1988 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1989 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1990 nfs4_unlock_state();
1991 return clientid_val;
1992}
1993
1994void
1995laundromat_main(void *not_used)
1996{
1997 time_t t;
1998
1999 t = nfs4_laundromat();
2000 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2001 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2002}
2003
2004/* search ownerid_hashtbl[] and close_lru for stateid owner
2005 * (stateid->si_stateownerid)
2006 */
fd39ca9a 2007static struct nfs4_stateowner *
1da177e4
LT		 2008find_openstateowner_id(u32 st_id, int flags) {
2009 struct nfs4_stateowner *local = NULL;
2010
2011 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2012 if (flags & CLOSE_STATE) {
2013 list_for_each_entry(local, &close_lru, so_close_lru) {
2014 if (local->so_id == st_id)
2015 return local;
2016 }
2017 }
2018 return NULL;
2019}
2020
2021static inline int
2022nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2023{
2024 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2025}
2026
2027static int
2028STALE_STATEID(stateid_t *stateid)
2029{
2030 if (stateid->si_boot == boot_time)
2031 return 0;
2032 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2033 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2034 stateid->si_generation);
2035 return 1;
2036}
2037
2038static inline int
2039access_permit_read(unsigned long access_bmap)
2040{
2041 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2042 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2043 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2044}
2045
2046static inline int
2047access_permit_write(unsigned long access_bmap)
2048{
2049 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2050 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2051}
2052
2053static
2054int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2055{
2056 int status = nfserr_openmode;
2057
2058 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2059 goto out;
2060 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2061 goto out;
2062 status = nfs_ok;
2063out:
2064 return status;
2065}
2066
1da177e4
LT		 2067static inline int
2068check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2069{
2070 /* Trying to call delegreturn with a special stateid? Yuch: */
2071 if (!(flags & (RD_STATE | WR_STATE)))
2072 return nfserr_bad_stateid;
2073 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2074 return nfs_ok;
2075 else if (nfs4_in_grace()) {
2076 /* Answer in remaining cases depends on existance of
2077 * conflicting state; so we must wait out the grace period. */
2078 return nfserr_grace;
2079 } else if (flags & WR_STATE)
2080 return nfs4_share_conflict(current_fh,
2081 NFS4_SHARE_DENY_WRITE);
2082 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2083 return nfs4_share_conflict(current_fh,
2084 NFS4_SHARE_DENY_READ);
2085}
2086
2087/*
2088 * Allow READ/WRITE during grace period on recovered state only for files
2089 * that are not able to provide mandatory locking.
2090 */
2091static inline int
2092io_during_grace_disallowed(struct inode *inode, int flags)
2093{
2094 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2095 && MANDATORY_LOCK(inode);
2096}
2097
2098/*
2099* Checks for stateid operations
2100*/
2101int
2102nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2103{
2104 struct nfs4_stateid *stp = NULL;
2105 struct nfs4_delegation *dp = NULL;
2106 stateid_t *stidp;
2107 struct inode *ino = current_fh->fh_dentry->d_inode;
2108 int status;
2109
2110 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2111 stateid->si_boot, stateid->si_stateownerid,
2112 stateid->si_fileid, stateid->si_generation);
2113 if (filpp)
2114 *filpp = NULL;
2115
2116 if (io_during_grace_disallowed(ino, flags))
2117 return nfserr_grace;
2118
2119 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2120 return check_special_stateids(current_fh, stateid, flags);
2121
2122 /* STALE STATEID */
2123 status = nfserr_stale_stateid;
2124 if (STALE_STATEID(stateid))
2125 goto out;
2126
2127 /* BAD STATEID */
2128 status = nfserr_bad_stateid;
2129 if (!stateid->si_fileid) { /* delegation stateid */
2130 if(!(dp = find_delegation_stateid(ino, stateid))) {
2131 dprintk("NFSD: delegation stateid not found\n");
2132 if (nfs4_in_grace())
2133 status = nfserr_grace;
2134 goto out;
2135 }
2136 stidp = &dp->dl_stateid;
2137 } else { /* open or lock stateid */
2138 if (!(stp = find_stateid(stateid, flags))) {
2139 dprintk("NFSD: open or lock stateid not found\n");
2140 if (nfs4_in_grace())
2141 status = nfserr_grace;
2142 goto out;
2143 }
2144 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2145 goto out;
2146 if (!stp->st_stateowner->so_confirmed)
2147 goto out;
2148 stidp = &stp->st_stateid;
2149 }
2150 if (stateid->si_generation > stidp->si_generation)
2151 goto out;
2152
2153 /* OLD STATEID */
2154 status = nfserr_old_stateid;
2155 if (stateid->si_generation < stidp->si_generation)
2156 goto out;
2157 if (stp) {
2158 if ((status = nfs4_check_openmode(stp,flags)))
2159 goto out;
2160 renew_client(stp->st_stateowner->so_client);
2161 if (filpp)
2162 *filpp = stp->st_vfs_file;
2163 } else if (dp) {
2164 if ((status = nfs4_check_delegmode(dp, flags)))
2165 goto out;
2166 renew_client(dp->dl_client);
2167 if (flags & DELEG_RET)
2168 unhash_delegation(dp);
2169 if (filpp)
2170 *filpp = dp->dl_vfs_file;
2171 }
2172 status = nfs_ok;
2173out:
2174 return status;
2175}
2176
2177
2178/*
2179 * Checks for sequence id mutating operations.
2180 */
fd39ca9a 2181static int
1da177e4
LT		 2182nfs4_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)
2183{
2184 int status;
2185 struct nfs4_stateid *stp;
2186 struct nfs4_stateowner *sop;
2187
2188 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2189 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2190 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2191 stateid->si_generation);
2192
2193 *stpp = NULL;
2194 *sopp = NULL;
2195
2196 status = nfserr_bad_stateid;
2197 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2198 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2199 goto out;
2200 }
2201
2202 status = nfserr_stale_stateid;
2203 if (STALE_STATEID(stateid))
2204 goto out;
2205 /*
2206 * We return BAD_STATEID if filehandle doesn't match stateid,
2207 * the confirmed flag is incorrecly set, or the generation
2208 * number is incorrect.
2209 * If there is no entry in the openfile table for this id,
2210 * we can't always return BAD_STATEID;
2211 * this might be a retransmitted CLOSE which has arrived after
2212 * the openfile has been released.
2213 */
2214 if (!(stp = find_stateid(stateid, flags)))
2215 goto no_nfs4_stateid;
2216
2217 status = nfserr_bad_stateid;
2218
2219 /* for new lock stateowners:
2220 * check that the lock->v.new.open_stateid
2221 * refers to an open stateowner
2222 *
2223 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2224 * as the open_stateid->st_stateowner->so_client->clientid
2225 */
2226 if (lockclid) {
2227 struct nfs4_stateowner *sop = stp->st_stateowner;
2228 struct nfs4_client *clp = sop->so_client;
2229
2230 if (!sop->so_is_open_owner)
2231 goto out;
2232 if (!cmp_clid(&clp->cl_clientid, lockclid))
2233 goto out;
2234 }
2235
2236 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2237 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2238 goto out;
2239 }
2240
2241 *stpp = stp;
2242 *sopp = sop = stp->st_stateowner;
2243
2244 /*
2245 * We now validate the seqid and stateid generation numbers.
2246 * For the moment, we ignore the possibility of
2247 * generation number wraparound.
2248 */
2249 if (seqid != sop->so_seqid + 1)
2250 goto check_replay;
2251
2252 if (sop->so_confirmed) {
2253 if (flags & CONFIRM) {
2254 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2255 goto out;
2256 }
2257 }
2258 else {
2259 if (!(flags & CONFIRM)) {
2260 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2261 goto out;
2262 }
2263 }
2264 if (stateid->si_generation > stp->st_stateid.si_generation) {
2265 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2266 goto out;
2267 }
2268
2269 status = nfserr_old_stateid;
2270 if (stateid->si_generation < stp->st_stateid.si_generation) {
2271 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2272 goto out;
2273 }
2274 /* XXX renew the client lease here */
2275 status = nfs_ok;
2276
2277out:
2278 return status;
2279
2280no_nfs4_stateid:
2281
2282 /*
2283 * We determine whether this is a bad stateid or a replay,
2284 * starting by trying to look up the stateowner.
2285 * If stateowner is not found - stateid is bad.
2286 */
2287 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2288 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2289 status = nfserr_bad_stateid;
2290 goto out;
2291 }
2292 *sopp = sop;
2293
2294check_replay:
2295 if (seqid == sop->so_seqid) {
2296 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2297 /* indicate replay to calling function */
2298 status = NFSERR_REPLAY_ME;
2299 } else {
2300 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2301
2302 *sopp = NULL;
2303 status = nfserr_bad_seqid;
2304 }
2305 goto out;
2306}
2307
2308int
2309nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2310{
2311 int status;
2312 struct nfs4_stateowner *sop;
2313 struct nfs4_stateid *stp;
2314
2315 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2316 (int)current_fh->fh_dentry->d_name.len,
2317 current_fh->fh_dentry->d_name.name);
2318
2319 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2320 goto out;
2321
2322 nfs4_lock_state();
2323
2324 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2325 &oc->oc_req_stateid,
2326 CHECK_FH | CONFIRM | OPEN_STATE,
2327 &oc->oc_stateowner, &stp, NULL)))
2328 goto out;
2329
2330 sop = oc->oc_stateowner;
2331 sop->so_confirmed = 1;
2332 update_stateid(&stp->st_stateid);
2333 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2334 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2335 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2336 stp->st_stateid.si_boot,
2337 stp->st_stateid.si_stateownerid,
2338 stp->st_stateid.si_fileid,
2339 stp->st_stateid.si_generation);
2340out:
2341 if (oc->oc_stateowner)
2342 nfs4_get_stateowner(oc->oc_stateowner);
2343 nfs4_unlock_state();
2344 return status;
2345}
2346
2347
2348/*
2349 * unset all bits in union bitmap (bmap) that
2350 * do not exist in share (from successful OPEN_DOWNGRADE)
2351 */
2352static void
2353reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2354{
2355 int i;
2356 for (i = 1; i < 4; i++) {
2357 if ((i & access) != i)
2358 __clear_bit(i, bmap);
2359 }
2360}
2361
2362static void
2363reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2364{
2365 int i;
2366 for (i = 0; i < 4; i++) {
2367 if ((i & deny) != i)
2368 __clear_bit(i, bmap);
2369 }
2370}
2371
2372int
2373nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2374{
2375 int status;
2376 struct nfs4_stateid *stp;
2377 unsigned int share_access;
2378
2379 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2380 (int)current_fh->fh_dentry->d_name.len,
2381 current_fh->fh_dentry->d_name.name);
2382
2383 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2384 return nfserr_inval;
2385
2386 nfs4_lock_state();
2387 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2388 &od->od_stateid,
2389 CHECK_FH | OPEN_STATE,
2390 &od->od_stateowner, &stp, NULL)))
2391 goto out;
2392
2393 status = nfserr_inval;
2394 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2395 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2396 stp->st_access_bmap, od->od_share_access);
2397 goto out;
2398 }
2399 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2400 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2401 stp->st_deny_bmap, od->od_share_deny);
2402 goto out;
2403 }
2404 set_access(&share_access, stp->st_access_bmap);
2405 nfs4_file_downgrade(stp->st_vfs_file,
2406 share_access & ~od->od_share_access);
2407
2408 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2409 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2410
2411 update_stateid(&stp->st_stateid);
2412 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2413 status = nfs_ok;
2414out:
2415 if (od->od_stateowner)
2416 nfs4_get_stateowner(od->od_stateowner);
2417 nfs4_unlock_state();
2418 return status;
2419}
2420
2421/*
2422 * nfs4_unlock_state() called after encode
2423 */
2424int
2425nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2426{
2427 int status;
2428 struct nfs4_stateid *stp;
2429
2430 dprintk("NFSD: nfsd4_close on file %.*s\n",
2431 (int)current_fh->fh_dentry->d_name.len,
2432 current_fh->fh_dentry->d_name.name);
2433
2434 nfs4_lock_state();
2435 /* check close_lru for replay */
2436 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2437 &close->cl_stateid,
2438 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2439 &close->cl_stateowner, &stp, NULL)))
2440 goto out;
2441 /*
2442 * Return success, but first update the stateid.
2443 */
2444 status = nfs_ok;
2445 update_stateid(&stp->st_stateid);
2446 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2447
2448 /* release_state_owner() calls nfsd_close() if needed */
2449 release_state_owner(stp, OPEN_STATE);
2450out:
2451 if (close->cl_stateowner)
2452 nfs4_get_stateowner(close->cl_stateowner);
2453 nfs4_unlock_state();
2454 return status;
2455}
2456
2457int
2458nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2459{
2460 int status;
2461
2462 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2463 goto out;
2464
2465 nfs4_lock_state();
2466 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2467 nfs4_unlock_state();
2468out:
2469 return status;
2470}
2471
2472
2473/*
2474 * Lock owner state (byte-range locks)
2475 */
2476#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2477#define LOCK_HASH_BITS 8
2478#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2479#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2480
2481#define lockownerid_hashval(id) \
2482 ((id) & LOCK_HASH_MASK)
2483
2484static inline unsigned int
2485lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2486 struct xdr_netobj *ownername)
2487{
2488 return (file_hashval(inode) + cl_id
2489 + opaque_hashval(ownername->data, ownername->len))
2490 & LOCK_HASH_MASK;
2491}
2492
2493static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2494static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2495static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2496
fd39ca9a 2497static struct nfs4_stateid *
1da177e4
LT		 2498find_stateid(stateid_t *stid, int flags)
2499{
2500 struct nfs4_stateid *local = NULL;
2501 u32 st_id = stid->si_stateownerid;
2502 u32 f_id = stid->si_fileid;
2503 unsigned int hashval;
2504
2505 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2506 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2507 hashval = stateid_hashval(st_id, f_id);
2508 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2509 if ((local->st_stateid.si_stateownerid == st_id) &&
2510 (local->st_stateid.si_fileid == f_id))
2511 return local;
2512 }
2513 }
2514 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2515 hashval = stateid_hashval(st_id, f_id);
2516 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2517 if ((local->st_stateid.si_stateownerid == st_id) &&
2518 (local->st_stateid.si_fileid == f_id))
2519 return local;
2520 }
2521 } else
2522 printk("NFSD: find_stateid: ERROR: no state flag\n");
2523 return NULL;
2524}
2525
2526static struct nfs4_delegation *
2527find_delegation_stateid(struct inode *ino, stateid_t *stid)
2528{
13cd2184
N		 2529 struct nfs4_file *fp;
2530 struct nfs4_delegation *dl;
1da177e4
LT		 2531
2532 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2533 stid->si_boot, stid->si_stateownerid,
2534 stid->si_fileid, stid->si_generation);
2535
1da177e4 2536 fp = find_file(ino);
13cd2184
N		 2537 if (!fp)
2538 return NULL;
2539 dl = find_delegation_file(fp, stid);
2540 put_nfs4_file(fp);
2541 return dl;
1da177e4
LT		 2542}
2543
2544/*
2545 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2546 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2547 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2548 * locking, this prevents us from being completely protocol-compliant. The
2549 * real solution to this problem is to start using unsigned file offsets in
2550 * the VFS, but this is a very deep change!
2551 */
2552static inline void
2553nfs4_transform_lock_offset(struct file_lock *lock)
2554{
2555 if (lock->fl_start < 0)
2556 lock->fl_start = OFFSET_MAX;
2557 if (lock->fl_end < 0)
2558 lock->fl_end = OFFSET_MAX;
2559}
2560
fd39ca9a 2561static int
1da177e4
LT		 2562nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2563{
2564 struct nfs4_stateowner *local = NULL;
2565 int status = 0;
2566
2567 if (hashval >= LOCK_HASH_SIZE)
2568 goto out;
2569 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2570 if (local == sop) {
2571 status = 1;
2572 goto out;
2573 }
2574 }
2575out:
2576 return status;
2577}
2578
2579
2580static inline void
2581nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2582{
2583 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2584 unsigned int hval = lockownerid_hashval(sop->so_id);
2585
2586 deny->ld_sop = NULL;
2587 if (nfs4_verify_lock_stateowner(sop, hval)) {
2588 kref_get(&sop->so_ref);
2589 deny->ld_sop = sop;
2590 deny->ld_clientid = sop->so_client->cl_clientid;
2591 }
2592 deny->ld_start = fl->fl_start;
2593 deny->ld_length = ~(u64)0;
2594 if (fl->fl_end != ~(u64)0)
2595 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2596 deny->ld_type = NFS4_READ_LT;
2597 if (fl->fl_type != F_RDLCK)
2598 deny->ld_type = NFS4_WRITE_LT;
2599}
2600
2601static struct nfs4_stateowner *
2602find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2603{
2604 struct nfs4_stateowner *local = NULL;
2605 int i;
2606
2607 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2608 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2609 if (!cmp_owner_str(local, owner, clid))
2610 continue;
2611 return local;
2612 }
2613 }
2614 return NULL;
2615}
2616
2617static struct nfs4_stateowner *
2618find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2619 struct xdr_netobj *owner)
2620{
2621 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2622 struct nfs4_stateowner *op;
2623
2624 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2625 if (cmp_owner_str(op, owner, clid))
2626 return op;
2627 }
2628 return NULL;
2629}
2630
2631/*
2632 * Alloc a lock owner structure.
2633 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2634 * occured.
2635 *
2636 * strhashval = lock_ownerstr_hashval
2637 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2638 */
2639
2640static struct nfs4_stateowner *
2641alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2642 struct nfs4_stateowner *sop;
2643 struct nfs4_replay *rp;
2644 unsigned int idhashval;
2645
2646 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2647 return NULL;
2648 idhashval = lockownerid_hashval(current_ownerid);
2649 INIT_LIST_HEAD(&sop->so_idhash);
2650 INIT_LIST_HEAD(&sop->so_strhash);
2651 INIT_LIST_HEAD(&sop->so_perclient);
2652 INIT_LIST_HEAD(&sop->so_perfilestate);
2653 INIT_LIST_HEAD(&sop->so_perlockowner);
2654 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2655 sop->so_time = 0;
2656 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2657 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2658 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2659 sop->so_is_open_owner = 0;
2660 sop->so_id = current_ownerid++;
2661 sop->so_client = clp;
2662 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2663 sop->so_confirmed = 1;
2664 rp = &sop->so_replay;
2665 rp->rp_status = NFSERR_SERVERFAULT;
2666 rp->rp_buflen = 0;
2667 rp->rp_buf = rp->rp_ibuf;
2668 return sop;
2669}
2670
fd39ca9a 2671static struct nfs4_stateid *
1da177e4
LT		 2672alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2673{
2674 struct nfs4_stateid *stp;
2675 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2676
5ac049ac
N		 2677 stp = nfs4_alloc_stateid();
2678 if (stp == NULL)
1da177e4
LT		 2679 goto out;
2680 INIT_LIST_HEAD(&stp->st_hash);
2681 INIT_LIST_HEAD(&stp->st_perfile);
2682 INIT_LIST_HEAD(&stp->st_perfilestate);
2683 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2684 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2685 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4
LT		 2686 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2687 stp->st_stateowner = sop;
13cd2184 2688 get_nfs4_file(fp);
1da177e4
LT		 2689 stp->st_file = fp;
2690 stp->st_stateid.si_boot = boot_time;
2691 stp->st_stateid.si_stateownerid = sop->so_id;
2692 stp->st_stateid.si_fileid = fp->fi_id;
2693 stp->st_stateid.si_generation = 0;
2694 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2695 stp->st_access_bmap = open_stp->st_access_bmap;
2696 stp->st_deny_bmap = open_stp->st_deny_bmap;
2697
2698out:
2699 return stp;
2700}
2701
fd39ca9a 2702static int
1da177e4
LT		 2703check_lock_length(u64 offset, u64 length)
2704{
2705 return ((length == 0) || ((length != ~(u64)0) &&
2706 LOFF_OVERFLOW(offset, length)));
2707}
2708
2709/*
2710 * LOCK operation
2711 */
2712int
2713nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2714{
2715 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2716 struct nfs4_stateid *lock_stp;
2717 struct file *filp;
2718 struct file_lock file_lock;
2719 struct file_lock *conflock;
2720 int status = 0;
2721 unsigned int strhashval;
2722
2723 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2724 (long long) lock->lk_offset,
2725 (long long) lock->lk_length);
2726
2727 if (nfs4_in_grace() && !lock->lk_reclaim)
2728 return nfserr_grace;
2729 if (!nfs4_in_grace() && lock->lk_reclaim)
2730 return nfserr_no_grace;
2731
2732 if (check_lock_length(lock->lk_offset, lock->lk_length))
2733 return nfserr_inval;
2734
2735 nfs4_lock_state();
2736
2737 if (lock->lk_is_new) {
2738 /*
2739 * Client indicates that this is a new lockowner.
2740 * Use open owner and open stateid to create lock owner and lock
2741 * stateid.
2742 */
2743 struct nfs4_stateid *open_stp = NULL;
2744 struct nfs4_file *fp;
2745
2746 status = nfserr_stale_clientid;
2747 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2748 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2749 goto out;
2750 }
2751
2752 /* is the new lock seqid presented by the client zero? */
2753 status = nfserr_bad_seqid;
2754 if (lock->v.new.lock_seqid != 0)
2755 goto out;
2756
2757 /* validate and update open stateid and open seqid */
2758 status = nfs4_preprocess_seqid_op(current_fh,
2759 lock->lk_new_open_seqid,
2760 &lock->lk_new_open_stateid,
2761 CHECK_FH | OPEN_STATE,
2762 &open_sop, &open_stp,
2763 &lock->v.new.clientid);
2764 if (status) {
2765 if (lock->lk_reclaim)
2766 status = nfserr_reclaim_bad;
2767 goto out;
2768 }
2769 /* create lockowner and lock stateid */
2770 fp = open_stp->st_file;
2771 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2772 open_sop->so_client->cl_clientid.cl_id,
2773 &lock->v.new.owner);
2774 /*
2775 * If we already have this lock owner, the client is in
2776 * error (or our bookeeping is wrong!)
2777 * for asking for a 'new lock'.
2778 */
2779 status = nfserr_bad_stateid;
2780 lock_sop = find_lockstateowner(&lock->v.new.owner,
2781 &lock->v.new.clientid);
2782 if (lock_sop)
2783 goto out;
2784 status = nfserr_resource;
2785 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2786 goto out;
2787 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2788 fp, open_stp)) == NULL) {
2789 release_stateowner(lock->lk_stateowner);
2790 lock->lk_stateowner = NULL;
2791 goto out;
2792 }
2793 /* bump the open seqid used to create the lock */
2794 open_sop->so_seqid++;
2795 } else {
2796 /* lock (lock owner + lock stateid) already exists */
2797 status = nfs4_preprocess_seqid_op(current_fh,
2798 lock->lk_old_lock_seqid,
2799 &lock->lk_old_lock_stateid,
2800 CHECK_FH | LOCK_STATE,
2801 &lock->lk_stateowner, &lock_stp, NULL);
2802 if (status)
2803 goto out;
2804 }
2805 /* lock->lk_stateowner and lock_stp have been created or found */
2806 filp = lock_stp->st_vfs_file;
2807
2808 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2809 printk("NFSD: nfsd4_lock: permission denied!\n");
2810 goto out;
2811 }
2812
2813 locks_init_lock(&file_lock);
2814 switch (lock->lk_type) {
2815 case NFS4_READ_LT:
2816 case NFS4_READW_LT:
2817 file_lock.fl_type = F_RDLCK;
2818 break;
2819 case NFS4_WRITE_LT:
2820 case NFS4_WRITEW_LT:
2821 file_lock.fl_type = F_WRLCK;
2822 break;
2823 default:
2824 status = nfserr_inval;
2825 goto out;
2826 }
2827 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2828 file_lock.fl_pid = current->tgid;
2829 file_lock.fl_file = filp;
2830 file_lock.fl_flags = FL_POSIX;
2831
2832 file_lock.fl_start = lock->lk_offset;
2833 if ((lock->lk_length == ~(u64)0) ||
2834 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2835 file_lock.fl_end = ~(u64)0;
2836 else
2837 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2838 nfs4_transform_lock_offset(&file_lock);
2839
2840 /*
2841 * Try to lock the file in the VFS.
2842 * Note: locks.c uses the BKL to protect the inode's lock list.
2843 */
2844
2845 status = posix_lock_file(filp, &file_lock);
2846 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2847 file_lock.fl_ops->fl_release_private(&file_lock);
2848 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2849 switch (-status) {
2850 case 0: /* success! */
2851 update_stateid(&lock_stp->st_stateid);
2852 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2853 sizeof(stateid_t));
2854 goto out;
2855 case (EAGAIN):
2856 goto conflicting_lock;
2857 case (EDEADLK):
2858 status = nfserr_deadlock;
2859 default:
2860 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2861 goto out_destroy_new_stateid;
2862 }
2863
2864conflicting_lock:
2865 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2866 status = nfserr_denied;
2867 /* XXX There is a race here. Future patch needed to provide
2868 * an atomic posix_lock_and_test_file
2869 */
2870 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2871 status = nfserr_serverfault;
2872 goto out;
2873 }
2874 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2875
2876out_destroy_new_stateid:
2877 if (lock->lk_is_new) {
2878 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2879 /*
2880 * An error encountered after instantiation of the new
2881 * stateid has forced us to destroy it.
2882 */
2883 if (!seqid_mutating_err(status))
2884 open_sop->so_seqid--;
2885
2886 release_state_owner(lock_stp, LOCK_STATE);
2887 }
2888out:
2889 if (lock->lk_stateowner)
2890 nfs4_get_stateowner(lock->lk_stateowner);
2891 nfs4_unlock_state();
2892 return status;
2893}
2894
2895/*
2896 * LOCKT operation
2897 */
2898int
2899nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2900{
2901 struct inode *inode;
2902 struct file file;
2903 struct file_lock file_lock;
2904 struct file_lock *conflicting_lock;
2905 int status;
2906
2907 if (nfs4_in_grace())
2908 return nfserr_grace;
2909
2910 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2911 return nfserr_inval;
2912
2913 lockt->lt_stateowner = NULL;
2914 nfs4_lock_state();
2915
2916 status = nfserr_stale_clientid;
2917 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2918 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2919 goto out;
2920 }
2921
2922 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2923 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2924 if (status == nfserr_symlink)
2925 status = nfserr_inval;
2926 goto out;
2927 }
2928
2929 inode = current_fh->fh_dentry->d_inode;
2930 locks_init_lock(&file_lock);
2931 switch (lockt->lt_type) {
2932 case NFS4_READ_LT:
2933 case NFS4_READW_LT:
2934 file_lock.fl_type = F_RDLCK;
2935 break;
2936 case NFS4_WRITE_LT:
2937 case NFS4_WRITEW_LT:
2938 file_lock.fl_type = F_WRLCK;
2939 break;
2940 default:
2941 printk("NFSD: nfs4_lockt: bad lock type!\n");
2942 status = nfserr_inval;
2943 goto out;
2944 }
2945
2946 lockt->lt_stateowner = find_lockstateowner_str(inode,
2947 &lockt->lt_clientid, &lockt->lt_owner);
2948 if (lockt->lt_stateowner)
2949 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2950 file_lock.fl_pid = current->tgid;
2951 file_lock.fl_flags = FL_POSIX;
2952
2953 file_lock.fl_start = lockt->lt_offset;
2954 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2955 file_lock.fl_end = ~(u64)0;
2956 else
2957 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2958
2959 nfs4_transform_lock_offset(&file_lock);
2960
2961 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2962 * since LOCKT doesn't require an OPEN, and therefore a struct
2963 * file may not exist, pass posix_test_lock a struct file with
2964 * only the dentry:inode set.
2965 */
2966 memset(&file, 0, sizeof (struct file));
2967 file.f_dentry = current_fh->fh_dentry;
2968
2969 status = nfs_ok;
2970 conflicting_lock = posix_test_lock(&file, &file_lock);
2971 if (conflicting_lock) {
2972 status = nfserr_denied;
2973 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2974 }
2975out:
2976 nfs4_unlock_state();
2977 return status;
2978}
2979
2980int
2981nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2982{
2983 struct nfs4_stateid *stp;
2984 struct file *filp = NULL;
2985 struct file_lock file_lock;
2986 int status;
2987
2988 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2989 (long long) locku->lu_offset,
2990 (long long) locku->lu_length);
2991
2992 if (check_lock_length(locku->lu_offset, locku->lu_length))
2993 return nfserr_inval;
2994
2995 nfs4_lock_state();
2996
2997 if ((status = nfs4_preprocess_seqid_op(current_fh,
2998 locku->lu_seqid,
2999 &locku->lu_stateid,
3000 CHECK_FH | LOCK_STATE,
3001 &locku->lu_stateowner, &stp, NULL)))
3002 goto out;
3003
3004 filp = stp->st_vfs_file;
3005 BUG_ON(!filp);
3006 locks_init_lock(&file_lock);
3007 file_lock.fl_type = F_UNLCK;
3008 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3009 file_lock.fl_pid = current->tgid;
3010 file_lock.fl_file = filp;
3011 file_lock.fl_flags = FL_POSIX;
3012 file_lock.fl_start = locku->lu_offset;
3013
3014 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
3015 file_lock.fl_end = ~(u64)0;
3016 else
3017 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
3018 nfs4_transform_lock_offset(&file_lock);
3019
3020 /*
3021 * Try to unlock the file in the VFS.
3022 */
3023 status = posix_lock_file(filp, &file_lock);
3024 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3025 file_lock.fl_ops->fl_release_private(&file_lock);
3026 if (status) {
3027 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3028 goto out_nfserr;
3029 }
3030 /*
3031 * OK, unlock succeeded; the only thing left to do is update the stateid.
3032 */
3033 update_stateid(&stp->st_stateid);
3034 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3035
3036out:
3037 if (locku->lu_stateowner)
3038 nfs4_get_stateowner(locku->lu_stateowner);
3039 nfs4_unlock_state();
3040 return status;
3041
3042out_nfserr:
3043 status = nfserrno(status);
3044 goto out;
3045}
3046
3047/*
3048 * returns
3049 * 1: locks held by lockowner
3050 * 0: no locks held by lockowner
3051 */
3052static int
3053check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3054{
3055 struct file_lock **flpp;
3056 struct inode *inode = filp->f_dentry->d_inode;
3057 int status = 0;
3058
3059 lock_kernel();
3060 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3061 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3062 status = 1;
3063 goto out;
3064 }
3065out:
3066 unlock_kernel();
3067 return status;
3068}
3069
3070int
3071nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3072{
3073 clientid_t *clid = &rlockowner->rl_clientid;
3074 struct nfs4_stateowner *local = NULL;
3075 struct xdr_netobj *owner = &rlockowner->rl_owner;
3076 int status;
3077
3078 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3079 clid->cl_boot, clid->cl_id);
3080
3081 /* XXX check for lease expiration */
3082
3083 status = nfserr_stale_clientid;
3084 if (STALE_CLIENTID(clid)) {
3085 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3086 return status;
3087 }
3088
3089 nfs4_lock_state();
3090
3091 status = nfs_ok;
3092 local = find_lockstateowner(owner, clid);
3093 if (local) {
3094 struct nfs4_stateid *stp;
3095
3096 /* check for any locks held by any stateid
3097 * associated with the (lock) stateowner */
3098 status = nfserr_locks_held;
3099 list_for_each_entry(stp, &local->so_perfilestate,
3100 st_perfilestate) {
3101 if (check_for_locks(stp->st_vfs_file, local))
3102 goto out;
3103 }
3104 /* no locks held by (lock) stateowner */
3105 status = nfs_ok;
3106 release_stateowner(local);
3107 }
3108out:
3109 nfs4_unlock_state();
3110 return status;
3111}
3112
3113static inline struct nfs4_client_reclaim *
a55370a3 3114alloc_reclaim(void)
1da177e4 3115{
a55370a3 3116 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3117}
3118
3119/*
3120 * failure => all reset bets are off, nfserr_no_grace...
3121 */
3122static int
a55370a3 3123nfs4_client_to_reclaim(char *name)
1da177e4
LT		 3124{
3125 unsigned int strhashval;
3126 struct nfs4_client_reclaim *crp = NULL;
3127
a55370a3
N		 3128 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3129 crp = alloc_reclaim();
1da177e4
LT		 3130 if (!crp)
3131 return 0;
a55370a3 3132 strhashval = clientstr_hashval(name);
1da177e4
LT		 3133 INIT_LIST_HEAD(&crp->cr_strhash);
3134 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3135 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3136 reclaim_str_hashtbl_size++;
3137 return 1;
3138}
3139
3140static void
3141nfs4_release_reclaim(void)
3142{
3143 struct nfs4_client_reclaim *crp = NULL;
3144 int i;
3145
1da177e4
LT		 3146 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3147 while (!list_empty(&reclaim_str_hashtbl[i])) {
3148 crp = list_entry(reclaim_str_hashtbl[i].next,
3149 struct nfs4_client_reclaim, cr_strhash);
3150 list_del(&crp->cr_strhash);
1da177e4
LT		 3151 kfree(crp);
3152 reclaim_str_hashtbl_size--;
3153 }
3154 }
3155 BUG_ON(reclaim_str_hashtbl_size);
3156}
3157
3158/*
3159 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3160static struct nfs4_client_reclaim *
1da177e4
LT		 3161nfs4_find_reclaim_client(clientid_t *clid)
3162{
3163 unsigned int strhashval;
3164 struct nfs4_client *clp;
3165 struct nfs4_client_reclaim *crp = NULL;
3166
3167
3168 /* find clientid in conf_id_hashtbl */
3169 clp = find_confirmed_client(clid);
3170 if (clp == NULL)
3171 return NULL;
3172
a55370a3
N		 3173 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3174 clp->cl_name.len, clp->cl_name.data,
3175 clp->cl_recdir);
1da177e4
LT		 3176
3177 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3178 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3179 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3180 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3181 return crp;
3182 }
3183 }
3184 return NULL;
3185}
3186
3187/*
3188* Called from OPEN. Look for clientid in reclaim list.
3189*/
3190int
3191nfs4_check_open_reclaim(clientid_t *clid)
3192{
dfc83565 3193 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3194}
3195
ac4d8ff2 3196/* initialization to perform at module load time: */
1da177e4 3197
ac4d8ff2
N		 3198void
3199nfs4_state_init(void)
1da177e4
LT		 3200{
3201 int i;
1da177e4 3202
1da177e4
LT		 3203 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3204 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3205 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3206 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3207 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3208 }
3209 for (i = 0; i < FILE_HASH_SIZE; i++) {
3210 INIT_LIST_HEAD(&file_hashtbl[i]);
3211 }
3212 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3213 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3214 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3215 }
3216 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3217 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3218 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3219 }
3220 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3221 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3222 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3223 }
1da177e4 3224 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3225 INIT_LIST_HEAD(&close_lru);
3226 INIT_LIST_HEAD(&client_lru);
3227 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3228 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3229 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3230 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3231}
3232
3233/* initialization to perform when the nfsd service is started: */
3234
3235static void
3236__nfs4_state_start(void)
3237{
3238 time_t grace_time;
3239
1da177e4 3240 boot_time = get_seconds();
d99a05ad
N		 3241 grace_time = max(user_lease_time, lease_time);
3242 lease_time = user_lease_time;
a76b4319 3243 in_grace = 1;
d99a05ad 3244 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3245 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3246 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3247}
3248
3249int
76a3550e 3250nfs4_state_start(void)
1da177e4
LT		 3251{
3252 int status;
3253
3254 if (nfs4_init)
3255 return 0;
3256 status = nfsd4_init_slabs();
3257 if (status)
3258 return status;
76a3550e 3259 __nfs4_state_start();
1da177e4
LT		 3260 nfs4_init = 1;
3261 return 0;
3262}
3263
3264int
3265nfs4_in_grace(void)
3266{
a76b4319 3267 return in_grace;
1da177e4
LT		 3268}
3269
3270time_t
3271nfs4_lease_time(void)
3272{
3273 return lease_time;
3274}
3275
3276static void
3277__nfs4_state_shutdown(void)
3278{
3279 int i;
3280 struct nfs4_client *clp = NULL;
3281 struct nfs4_delegation *dp = NULL;
3282 struct nfs4_stateowner *sop = NULL;
3283 struct list_head *pos, *next, reaplist;
3284
3285 list_for_each_safe(pos, next, &close_lru) {
3286 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3287 list_del(&sop->so_close_lru);
3288 nfs4_put_stateowner(sop);
3289 }
3290
3291 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3292 while (!list_empty(&conf_id_hashtbl[i])) {
3293 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3294 expire_client(clp);
3295 }
3296 while (!list_empty(&unconf_str_hashtbl[i])) {
3297 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3298 expire_client(clp);
3299 }
3300 }
3301 INIT_LIST_HEAD(&reaplist);
3302 spin_lock(&recall_lock);
3303 list_for_each_safe(pos, next, &del_recall_lru) {
3304 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3305 list_move(&dp->dl_recall_lru, &reaplist);
3306 }
3307 spin_unlock(&recall_lock);
3308 list_for_each_safe(pos, next, &reaplist) {
3309 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3310 list_del_init(&dp->dl_recall_lru);
3311 unhash_delegation(dp);
3312 }
3313
1da177e4 3314 cancel_delayed_work(&laundromat_work);
58da282b
N		 3315 flush_workqueue(laundry_wq);
3316 destroy_workqueue(laundry_wq);
1da177e4 3317 nfs4_init = 0;
1da177e4
LT		 3318}
3319
3320void
3321nfs4_state_shutdown(void)
3322{
3323 nfs4_lock_state();
3324 nfs4_release_reclaim();
3325 __nfs4_state_shutdown();
3326 nfsd4_free_slabs();
3327 nfs4_unlock_state();
3328}
3329
3330/*
3331 * Called when leasetime is changed.
3332 *
d99a05ad
N		 3333 * The only way the protocol gives us to handle on-the-fly lease changes is to
3334 * simulate a reboot. Instead of doing that, we just wait till the next time
3335 * we start to register any changes in lease time. If the administrator
3336 * really wants to change the lease time *now*, they can go ahead and bring
3337 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3338 */
3339void
3340nfs4_reset_lease(time_t leasetime)
3341{
d99a05ad
N		 3342 lock_kernel();
3343 user_lease_time = leasetime;
3344 unlock_kernel();
1da177e4 3345}
Linux 6.x block layer and io_uring tree(s)