blob: 92968c94c6e6aa79ac19523216a8d9d9f9b1a8ab [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
NeilBrown0964a3d2005-06-23 22:04:32 -070051#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53#define NFSDDBG_FACILITY NFSDDBG_PROC
54
55/* Globals */
56static time_t lease_time = 90; /* default lease time */
NeilBrownd99a05a2005-06-23 22:03:21 -070057static time_t user_lease_time = 90;
NeilBrownfd39ca92005-06-23 22:04:03 -070058static time_t boot_time;
NeilBrowna76b4312005-06-23 22:04:01 -070059static int in_grace = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static u32 current_clientid = 1;
61static u32 current_ownerid = 1;
62static u32 current_fileid = 1;
63static u32 current_delegid = 1;
64static u32 nfs4_init;
NeilBrownfd39ca92005-06-23 22:04:03 -070065static stateid_t zerostateid; /* bits all 0 */
66static stateid_t onestateid; /* bits all 1 */
67
68#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
69#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/* forward declarations */
NeilBrownfd39ca92005-06-23 22:04:03 -070072static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
74static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
NeilBrown0964a3d2005-06-23 22:04:32 -070075static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
76static void nfs4_set_recdir(char *recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78/* Locking:
79 *
80 * client_sema:
81 * protects clientid_hashtbl[], clientstr_hashtbl[],
82 * unconfstr_hashtbl[], uncofid_hashtbl[].
83 */
84static DECLARE_MUTEX(client_sema);
85
NeilBrownfd39ca92005-06-23 22:04:03 -070086static kmem_cache_t *stateowner_slab = NULL;
87static kmem_cache_t *file_slab = NULL;
88static kmem_cache_t *stateid_slab = NULL;
89static kmem_cache_t *deleg_slab = NULL;
NeilBrowne60d4392005-06-23 22:03:01 -070090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091void
92nfs4_lock_state(void)
93{
94 down(&client_sema);
95}
96
97void
98nfs4_unlock_state(void)
99{
100 up(&client_sema);
101}
102
103static inline u32
104opaque_hashval(const void *ptr, int nbytes)
105{
106 unsigned char *cptr = (unsigned char *) ptr;
107
108 u32 x = 0;
109 while (nbytes--) {
110 x *= 37;
111 x += *cptr++;
112 }
113 return x;
114}
115
116/* forward declarations */
117static void release_stateowner(struct nfs4_stateowner *sop);
118static void release_stateid(struct nfs4_stateid *stp, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120/*
121 * Delegation state
122 */
123
124/* recall_lock protects the del_recall_lru */
NeilBrownfd39ca92005-06-23 22:04:03 -0700125static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126static struct list_head del_recall_lru;
127
NeilBrown13cd2182005-06-23 22:03:10 -0700128static void
129free_nfs4_file(struct kref *kref)
130{
131 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
132 list_del(&fp->fi_hash);
133 iput(fp->fi_inode);
134 kmem_cache_free(file_slab, fp);
135}
136
137static inline void
138put_nfs4_file(struct nfs4_file *fi)
139{
140 kref_put(&fi->fi_ref, free_nfs4_file);
141}
142
143static inline void
144get_nfs4_file(struct nfs4_file *fi)
145{
146 kref_get(&fi->fi_ref);
147}
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149static struct nfs4_delegation *
150alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
151{
152 struct nfs4_delegation *dp;
153 struct nfs4_file *fp = stp->st_file;
154 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
155
156 dprintk("NFSD alloc_init_deleg\n");
NeilBrown5b2d21c2005-06-23 22:03:04 -0700157 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
158 if (dp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return dp;
NeilBrownea1da632005-06-23 22:04:17 -0700160 INIT_LIST_HEAD(&dp->dl_perfile);
161 INIT_LIST_HEAD(&dp->dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 INIT_LIST_HEAD(&dp->dl_recall_lru);
163 dp->dl_client = clp;
NeilBrown13cd2182005-06-23 22:03:10 -0700164 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 dp->dl_file = fp;
166 dp->dl_flock = NULL;
167 get_file(stp->st_vfs_file);
168 dp->dl_vfs_file = stp->st_vfs_file;
169 dp->dl_type = type;
170 dp->dl_recall.cbr_dp = NULL;
171 dp->dl_recall.cbr_ident = cb->cb_ident;
172 dp->dl_recall.cbr_trunc = 0;
173 dp->dl_stateid.si_boot = boot_time;
174 dp->dl_stateid.si_stateownerid = current_delegid++;
175 dp->dl_stateid.si_fileid = 0;
176 dp->dl_stateid.si_generation = 0;
177 dp->dl_fhlen = current_fh->fh_handle.fh_size;
178 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
179 current_fh->fh_handle.fh_size);
180 dp->dl_time = 0;
181 atomic_set(&dp->dl_count, 1);
NeilBrownea1da632005-06-23 22:04:17 -0700182 list_add(&dp->dl_perfile, &fp->fi_delegations);
183 list_add(&dp->dl_perclnt, &clp->cl_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return dp;
185}
186
187void
188nfs4_put_delegation(struct nfs4_delegation *dp)
189{
190 if (atomic_dec_and_test(&dp->dl_count)) {
191 dprintk("NFSD: freeing dp %p\n",dp);
NeilBrown13cd2182005-06-23 22:03:10 -0700192 put_nfs4_file(dp->dl_file);
NeilBrown5b2d21c2005-06-23 22:03:04 -0700193 kmem_cache_free(deleg_slab, dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195}
196
197/* Remove the associated file_lock first, then remove the delegation.
198 * lease_modify() is called to remove the FS_LEASE file_lock from
199 * the i_flock list, eventually calling nfsd's lock_manager
200 * fl_release_callback.
201 */
202static void
203nfs4_close_delegation(struct nfs4_delegation *dp)
204{
205 struct file *filp = dp->dl_vfs_file;
206
207 dprintk("NFSD: close_delegation dp %p\n",dp);
208 dp->dl_vfs_file = NULL;
209 /* The following nfsd_close may not actually close the file,
210 * but we want to remove the lease in any case. */
NeilBrownc9071322005-04-16 15:26:38 -0700211 if (dp->dl_flock)
212 setlease(filp, F_UNLCK, &dp->dl_flock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 nfsd_close(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
216/* Called under the state lock. */
217static void
218unhash_delegation(struct nfs4_delegation *dp)
219{
NeilBrownea1da632005-06-23 22:04:17 -0700220 list_del_init(&dp->dl_perfile);
221 list_del_init(&dp->dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 spin_lock(&recall_lock);
223 list_del_init(&dp->dl_recall_lru);
224 spin_unlock(&recall_lock);
225 nfs4_close_delegation(dp);
226 nfs4_put_delegation(dp);
227}
228
229/*
230 * SETCLIENTID state
231 */
232
233/* Hash tables for nfs4_clientid state */
234#define CLIENT_HASH_BITS 4
235#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
236#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
237
238#define clientid_hashval(id) \
239 ((id) & CLIENT_HASH_MASK)
NeilBrowna55370a2005-06-23 22:03:52 -0700240#define clientstr_hashval(name) \
241 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242/*
243 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
244 * used in reboot/reset lease grace period processing
245 *
246 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
247 * setclientid_confirmed info.
248 *
249 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
250 * setclientid info.
251 *
252 * client_lru holds client queue ordered by nfs4_client.cl_time
253 * for lease renewal.
254 *
255 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
256 * for last close replay.
257 */
258static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
259static int reclaim_str_hashtbl_size = 0;
260static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
261static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
262static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
263static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
264static struct list_head client_lru;
265static struct list_head close_lru;
266
267static inline void
268renew_client(struct nfs4_client *clp)
269{
270 /*
271 * Move client to the end to the LRU list.
272 */
273 dprintk("renewing client (clientid %08x/%08x)\n",
274 clp->cl_clientid.cl_boot,
275 clp->cl_clientid.cl_id);
276 list_move_tail(&clp->cl_lru, &client_lru);
277 clp->cl_time = get_seconds();
278}
279
280/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
281static int
282STALE_CLIENTID(clientid_t *clid)
283{
284 if (clid->cl_boot == boot_time)
285 return 0;
286 dprintk("NFSD stale clientid (%08x/%08x)\n",
287 clid->cl_boot, clid->cl_id);
288 return 1;
289}
290
291/*
292 * XXX Should we use a slab cache ?
293 * This type of memory management is somewhat inefficient, but we use it
294 * anyway since SETCLIENTID is not a common operation.
295 */
296static inline struct nfs4_client *
297alloc_client(struct xdr_netobj name)
298{
299 struct nfs4_client *clp;
300
301 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
302 memset(clp, 0, sizeof(*clp));
303 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
304 memcpy(clp->cl_name.data, name.data, name.len);
305 clp->cl_name.len = name.len;
306 }
307 else {
308 kfree(clp);
309 clp = NULL;
310 }
311 }
312 return clp;
313}
314
315static inline void
316free_client(struct nfs4_client *clp)
317{
318 if (clp->cl_cred.cr_group_info)
319 put_group_info(clp->cl_cred.cr_group_info);
320 kfree(clp->cl_name.data);
321 kfree(clp);
322}
323
324void
325put_nfs4_client(struct nfs4_client *clp)
326{
327 if (atomic_dec_and_test(&clp->cl_count))
328 free_client(clp);
329}
330
331static void
332expire_client(struct nfs4_client *clp)
333{
334 struct nfs4_stateowner *sop;
335 struct nfs4_delegation *dp;
336 struct nfs4_callback *cb = &clp->cl_callback;
337 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
338 struct list_head reaplist;
339
340 dprintk("NFSD: expire_client cl_count %d\n",
341 atomic_read(&clp->cl_count));
342
343 /* shutdown rpc client, ending any outstanding recall rpcs */
344 if (atomic_read(&cb->cb_set) == 1 && clnt) {
345 rpc_shutdown_client(clnt);
346 clnt = clp->cl_callback.cb_client = NULL;
347 }
348
349 INIT_LIST_HEAD(&reaplist);
350 spin_lock(&recall_lock);
NeilBrownea1da632005-06-23 22:04:17 -0700351 while (!list_empty(&clp->cl_delegations)) {
352 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
354 dp->dl_flock);
NeilBrownea1da632005-06-23 22:04:17 -0700355 list_del_init(&dp->dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 list_move(&dp->dl_recall_lru, &reaplist);
357 }
358 spin_unlock(&recall_lock);
359 while (!list_empty(&reaplist)) {
360 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
361 list_del_init(&dp->dl_recall_lru);
362 unhash_delegation(dp);
363 }
364 list_del(&clp->cl_idhash);
365 list_del(&clp->cl_strhash);
366 list_del(&clp->cl_lru);
NeilBrownea1da632005-06-23 22:04:17 -0700367 while (!list_empty(&clp->cl_openowners)) {
368 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 release_stateowner(sop);
370 }
371 put_nfs4_client(clp);
372}
373
374static struct nfs4_client *
NeilBrowna55370a2005-06-23 22:03:52 -0700375create_client(struct xdr_netobj name, char *recdir) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 struct nfs4_client *clp;
377
378 if (!(clp = alloc_client(name)))
379 goto out;
NeilBrowna55370a2005-06-23 22:03:52 -0700380 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 atomic_set(&clp->cl_count, 1);
382 atomic_set(&clp->cl_callback.cb_set, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 INIT_LIST_HEAD(&clp->cl_idhash);
384 INIT_LIST_HEAD(&clp->cl_strhash);
NeilBrownea1da632005-06-23 22:04:17 -0700385 INIT_LIST_HEAD(&clp->cl_openowners);
386 INIT_LIST_HEAD(&clp->cl_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 INIT_LIST_HEAD(&clp->cl_lru);
388out:
389 return clp;
390}
391
392static void
393copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
394 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
395}
396
397static void
398copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
399 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
400 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
401}
402
403static void
404copy_cred(struct svc_cred *target, struct svc_cred *source) {
405
406 target->cr_uid = source->cr_uid;
407 target->cr_gid = source->cr_gid;
408 target->cr_group_info = source->cr_group_info;
409 get_group_info(target->cr_group_info);
410}
411
NeilBrowna55370a2005-06-23 22:03:52 -0700412static inline int
413same_name(const char *n1, const char *n2) {
414 return 0 == memcmp(n1, n2, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415}
416
417static int
418cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
419 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
420}
421
422static int
423cmp_clid(clientid_t * cl1, clientid_t * cl2) {
424 return((cl1->cl_boot == cl2->cl_boot) &&
425 (cl1->cl_id == cl2->cl_id));
426}
427
428/* XXX what about NGROUP */
429static int
430cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
431 return(cr1->cr_uid == cr2->cr_uid);
432
433}
434
435static void
436gen_clid(struct nfs4_client *clp) {
437 clp->cl_clientid.cl_boot = boot_time;
438 clp->cl_clientid.cl_id = current_clientid++;
439}
440
441static void
442gen_confirm(struct nfs4_client *clp) {
443 struct timespec tv;
444 u32 * p;
445
446 tv = CURRENT_TIME;
447 p = (u32 *)clp->cl_confirm.data;
448 *p++ = tv.tv_sec;
449 *p++ = tv.tv_nsec;
450}
451
452static int
453check_name(struct xdr_netobj name) {
454
455 if (name.len == 0)
456 return 0;
457 if (name.len > NFS4_OPAQUE_LIMIT) {
458 printk("NFSD: check_name: name too long(%d)!\n", name.len);
459 return 0;
460 }
461 return 1;
462}
463
NeilBrownfd39ca92005-06-23 22:04:03 -0700464static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
466{
467 unsigned int idhashval;
468
469 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
470 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
471 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
472 list_add_tail(&clp->cl_lru, &client_lru);
473 clp->cl_time = get_seconds();
474}
475
NeilBrownfd39ca92005-06-23 22:04:03 -0700476static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477move_to_confirmed(struct nfs4_client *clp)
478{
479 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
480 unsigned int strhashval;
481
482 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
483 list_del_init(&clp->cl_strhash);
484 list_del_init(&clp->cl_idhash);
485 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
NeilBrowna55370a2005-06-23 22:03:52 -0700486 strhashval = clientstr_hashval(clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
488 renew_client(clp);
489}
490
491static struct nfs4_client *
492find_confirmed_client(clientid_t *clid)
493{
494 struct nfs4_client *clp;
495 unsigned int idhashval = clientid_hashval(clid->cl_id);
496
497 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
498 if (cmp_clid(&clp->cl_clientid, clid))
499 return clp;
500 }
501 return NULL;
502}
503
504static struct nfs4_client *
505find_unconfirmed_client(clientid_t *clid)
506{
507 struct nfs4_client *clp;
508 unsigned int idhashval = clientid_hashval(clid->cl_id);
509
510 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
511 if (cmp_clid(&clp->cl_clientid, clid))
512 return clp;
513 }
514 return NULL;
515}
516
NeilBrown28ce6052005-06-23 22:03:56 -0700517static struct nfs4_client *
518find_confirmed_client_by_str(const char *dname, unsigned int hashval)
519{
520 struct nfs4_client *clp;
521
522 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
523 if (same_name(clp->cl_recdir, dname))
524 return clp;
525 }
526 return NULL;
527}
528
529static struct nfs4_client *
530find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
531{
532 struct nfs4_client *clp;
533
534 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
535 if (same_name(clp->cl_recdir, dname))
536 return clp;
537 }
538 return NULL;
539}
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541/* a helper function for parse_callback */
542static int
543parse_octet(unsigned int *lenp, char **addrp)
544{
545 unsigned int len = *lenp;
546 char *p = *addrp;
547 int n = -1;
548 char c;
549
550 for (;;) {
551 if (!len)
552 break;
553 len--;
554 c = *p++;
555 if (c == '.')
556 break;
557 if ((c < '0') || (c > '9')) {
558 n = -1;
559 break;
560 }
561 if (n < 0)
562 n = 0;
563 n = (n * 10) + (c - '0');
564 if (n > 255) {
565 n = -1;
566 break;
567 }
568 }
569 *lenp = len;
570 *addrp = p;
571 return n;
572}
573
574/* parse and set the setclientid ipv4 callback address */
NeilBrownfd39ca92005-06-23 22:04:03 -0700575static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
577{
578 int temp = 0;
579 u32 cbaddr = 0;
580 u16 cbport = 0;
581 u32 addrlen = addr_len;
582 char *addr = addr_val;
583 int i, shift;
584
585 /* ipaddress */
586 shift = 24;
587 for(i = 4; i > 0 ; i--) {
588 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
589 return 0;
590 }
591 cbaddr |= (temp << shift);
592 if (shift > 0)
593 shift -= 8;
594 }
595 *cbaddrp = cbaddr;
596
597 /* port */
598 shift = 8;
599 for(i = 2; i > 0 ; i--) {
600 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
601 return 0;
602 }
603 cbport |= (temp << shift);
604 if (shift > 0)
605 shift -= 8;
606 }
607 *cbportp = cbport;
608 return 1;
609}
610
NeilBrownfd39ca92005-06-23 22:04:03 -0700611static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
613{
614 struct nfs4_callback *cb = &clp->cl_callback;
615
616 /* Currently, we only support tcp for the callback channel */
617 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
618 goto out_err;
619
620 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
621 &cb->cb_addr, &cb->cb_port)))
622 goto out_err;
623 cb->cb_prog = se->se_callback_prog;
624 cb->cb_ident = se->se_callback_ident;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 return;
626out_err:
627 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
628 "will not receive delegations\n",
629 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
630
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 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;
NeilBrown28ce6052005-06-23 22:03:56 -0700677 struct nfs4_client *conf, *unconf, *new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 int status;
NeilBrowna55370a2005-06-23 22:03:52 -0700679 char dname[HEXDIR_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 status = nfserr_inval;
682 if (!check_name(clname))
683 goto out;
684
NeilBrowna55370a2005-06-23 22:03:52 -0700685 status = nfs4_make_rec_clidname(dname, &clname);
686 if (status)
687 goto out;
688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 /*
690 * XXX The Duplicate Request Cache (DRC) has been checked (??)
691 * We get here on a DRC miss.
692 */
693
NeilBrowna55370a2005-06-23 22:03:52 -0700694 strhashval = clientstr_hashval(dname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 nfs4_lock_state();
NeilBrown28ce6052005-06-23 22:03:56 -0700697 conf = find_confirmed_client_by_str(dname, strhashval);
698 if (conf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 /*
700 * CASE 0:
701 * clname match, confirmed, different principal
702 * or different ip_address
703 */
704 status = nfserr_clid_inuse;
NeilBrown28ce6052005-06-23 22:03:56 -0700705 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706 || conf->cl_addr != ip_addr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 printk("NFSD: setclientid: string in use by client"
708 "(clientid %08x/%08x)\n",
NeilBrown28ce6052005-06-23 22:03:56 -0700709 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 goto out;
711 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 }
NeilBrown28ce6052005-06-23 22:03:56 -0700713 unconf = find_unconfirmed_client_by_str(dname, strhashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 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);
NeilBrowna55370a2005-06-23 22:03:52 -0700722 new = create_client(clname, dname);
723 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 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 */
NeilBrown31f4a6c2005-06-23 22:04:06 -0700746 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
NeilBrowna55370a2005-06-23 22:03:52 -0700754 new = create_client(clname, dname);
755 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 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 */
NeilBrowna55370a2005-06-23 22:03:52 -0700773 new = create_client(clname, dname);
774 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 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);
NeilBrowna55370a2005-06-23 22:03:52 -0700800 new = create_client(clname, dname);
801 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 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;
NeilBrown21ab45a2005-06-23 22:04:14 -0700837 struct nfs4_client *conf, *unconf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 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();
NeilBrown21ab45a2005-06-23 22:04:14 -0700850
851 conf = find_confirmed_client(clid);
852 unconf = find_unconfirmed_client(clid);
853
854 status = nfserr_clid_inuse;
855 if (conf && conf->cl_addr != ip_addr)
856 goto out;
857 if (unconf && unconf->cl_addr != ip_addr)
858 goto out;
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if ((conf && unconf) &&
861 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
862 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
NeilBrowna55370a2005-06-23 22:03:52 -0700863 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
NeilBrown7c79f732005-06-23 22:04:13 -0700865 /* CASE 1:
866 * unconf record that matches input clientid and input confirm.
867 * conf record that matches input clientid.
868 * conf and unconf records match names, verifiers
869 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
871 status = nfserr_clid_inuse;
872 else {
NeilBrown1a69c172005-06-23 22:04:08 -0700873 /* XXX: We just turn off callbacks until we can handle
874 * change request correctly. */
NeilBrowncb36d632005-06-23 22:04:23 -0700875 atomic_set(&conf->cl_callback.cb_set, 0);
NeilBrown21ab45a2005-06-23 22:04:14 -0700876 gen_confirm(conf);
NeilBrown46309022005-07-07 17:59:10 -0700877 nfsd4_remove_clid_dir(unconf);
NeilBrown1a69c172005-06-23 22:04:08 -0700878 expire_client(unconf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 status = nfs_ok;
NeilBrown1a69c172005-06-23 22:04:08 -0700880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 }
NeilBrown7c79f732005-06-23 22:04:13 -0700882 } else if ((conf && !unconf) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 ((conf && unconf) &&
884 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
NeilBrowna55370a2005-06-23 22:03:52 -0700885 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
NeilBrown7c79f732005-06-23 22:04:13 -0700886 /* CASE 2:
887 * conf record that matches input clientid.
888 * if unconf record matches input clientid, then
889 * unconf->cl_name or unconf->cl_verifier don't match the
890 * conf record.
891 */
NeilBrown21ab45a2005-06-23 22:04:14 -0700892 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 status = nfserr_clid_inuse;
NeilBrown21ab45a2005-06-23 22:04:14 -0700894 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 status = nfs_ok;
NeilBrown7c79f732005-06-23 22:04:13 -0700896 } else if (!conf && unconf
897 && cmp_verf(&unconf->cl_confirm, &confirm)) {
898 /* CASE 3:
899 * conf record not found.
900 * unconf record found.
901 * unconf->cl_confirm matches input confirm
902 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
904 status = nfserr_clid_inuse;
905 } else {
NeilBrown1a69c172005-06-23 22:04:08 -0700906 unsigned int hash =
907 clientstr_hashval(unconf->cl_recdir);
908 conf = find_confirmed_client_by_str(unconf->cl_recdir,
909 hash);
910 if (conf) {
NeilBrownc7b9a452005-06-23 22:04:30 -0700911 nfsd4_remove_clid_dir(conf);
NeilBrown1a69c172005-06-23 22:04:08 -0700912 expire_client(conf);
913 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 move_to_confirmed(unconf);
NeilBrown21ab45a2005-06-23 22:04:14 -0700915 conf = unconf;
NeilBrown1a69c172005-06-23 22:04:08 -0700916 status = nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 }
NeilBrown7c79f732005-06-23 22:04:13 -0700918 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
919 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
920 &confirm)))) {
921 /* CASE 4:
922 * conf record not found, or if conf, conf->cl_confirm does not
923 * match input confirm.
924 * unconf record not found, or if unconf, unconf->cl_confirm
925 * does not match input confirm.
926 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 status = nfserr_stale_clientid;
NeilBrown7c79f732005-06-23 22:04:13 -0700928 } else {
NeilBrown08e89872005-06-23 22:04:11 -0700929 /* check that we have hit one of the cases...*/
930 status = nfserr_clid_inuse;
931 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932out:
933 if (!status)
NeilBrown21ab45a2005-06-23 22:04:14 -0700934 nfsd4_probe_callback(conf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 nfs4_unlock_state();
936 return status;
937}
938
939/*
940 * Open owner state (share locks)
941 */
942
943/* hash tables for nfs4_stateowner */
944#define OWNER_HASH_BITS 8
945#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
946#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
947
948#define ownerid_hashval(id) \
949 ((id) & OWNER_HASH_MASK)
950#define ownerstr_hashval(clientid, ownername) \
951 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
952
953static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
954static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
955
956/* hash table for nfs4_file */
957#define FILE_HASH_BITS 8
958#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
959#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
960/* hash table for (open)nfs4_stateid */
961#define STATEID_HASH_BITS 10
962#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
963#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
964
965#define file_hashval(x) \
966 hash_ptr(x, FILE_HASH_BITS)
967#define stateid_hashval(owner_id, file_id) \
968 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
969
970static struct list_head file_hashtbl[FILE_HASH_SIZE];
971static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
972
973/* OPEN Share state helper functions */
974static inline struct nfs4_file *
975alloc_init_file(struct inode *ino)
976{
977 struct nfs4_file *fp;
978 unsigned int hashval = file_hashval(ino);
979
NeilBrowne60d4392005-06-23 22:03:01 -0700980 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
981 if (fp) {
NeilBrown13cd2182005-06-23 22:03:10 -0700982 kref_init(&fp->fi_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 INIT_LIST_HEAD(&fp->fi_hash);
NeilBrown8beefa22005-06-23 22:03:08 -0700984 INIT_LIST_HEAD(&fp->fi_stateids);
985 INIT_LIST_HEAD(&fp->fi_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
987 fp->fi_inode = igrab(ino);
988 fp->fi_id = current_fileid++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 return fp;
990 }
991 return NULL;
992}
993
994static void
NeilBrowne60d4392005-06-23 22:03:01 -0700995nfsd4_free_slab(kmem_cache_t **slab)
996{
997 int status;
998
999 if (*slab == NULL)
1000 return;
1001 status = kmem_cache_destroy(*slab);
1002 *slab = NULL;
1003 WARN_ON(status);
1004}
1005
1006static void
1007nfsd4_free_slabs(void)
1008{
1009 nfsd4_free_slab(&stateowner_slab);
1010 nfsd4_free_slab(&file_slab);
NeilBrown5ac049a2005-06-23 22:03:03 -07001011 nfsd4_free_slab(&stateid_slab);
NeilBrown5b2d21c2005-06-23 22:03:04 -07001012 nfsd4_free_slab(&deleg_slab);
NeilBrowne60d4392005-06-23 22:03:01 -07001013}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015static int
1016nfsd4_init_slabs(void)
1017{
1018 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1019 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
NeilBrowne60d4392005-06-23 22:03:01 -07001020 if (stateowner_slab == NULL)
1021 goto out_nomem;
1022 file_slab = kmem_cache_create("nfsd4_files",
1023 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1024 if (file_slab == NULL)
1025 goto out_nomem;
NeilBrown5ac049a2005-06-23 22:03:03 -07001026 stateid_slab = kmem_cache_create("nfsd4_stateids",
1027 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1028 if (stateid_slab == NULL)
1029 goto out_nomem;
NeilBrown5b2d21c2005-06-23 22:03:04 -07001030 deleg_slab = kmem_cache_create("nfsd4_delegations",
1031 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1032 if (deleg_slab == NULL)
1033 goto out_nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 return 0;
NeilBrowne60d4392005-06-23 22:03:01 -07001035out_nomem:
1036 nfsd4_free_slabs();
1037 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1038 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039}
1040
1041void
1042nfs4_free_stateowner(struct kref *kref)
1043{
1044 struct nfs4_stateowner *sop =
1045 container_of(kref, struct nfs4_stateowner, so_ref);
1046 kfree(sop->so_owner.data);
1047 kmem_cache_free(stateowner_slab, sop);
1048}
1049
1050static inline struct nfs4_stateowner *
1051alloc_stateowner(struct xdr_netobj *owner)
1052{
1053 struct nfs4_stateowner *sop;
1054
1055 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1056 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1057 memcpy(sop->so_owner.data, owner->data, owner->len);
1058 sop->so_owner.len = owner->len;
1059 kref_init(&sop->so_ref);
1060 return sop;
1061 }
1062 kmem_cache_free(stateowner_slab, sop);
1063 }
1064 return NULL;
1065}
1066
1067static struct nfs4_stateowner *
1068alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1069 struct nfs4_stateowner *sop;
1070 struct nfs4_replay *rp;
1071 unsigned int idhashval;
1072
1073 if (!(sop = alloc_stateowner(&open->op_owner)))
1074 return NULL;
1075 idhashval = ownerid_hashval(current_ownerid);
1076 INIT_LIST_HEAD(&sop->so_idhash);
1077 INIT_LIST_HEAD(&sop->so_strhash);
1078 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07001079 INIT_LIST_HEAD(&sop->so_stateids);
1080 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 INIT_LIST_HEAD(&sop->so_close_lru);
1082 sop->so_time = 0;
1083 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1084 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07001085 list_add(&sop->so_perclient, &clp->cl_openowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 sop->so_is_open_owner = 1;
1087 sop->so_id = current_ownerid++;
1088 sop->so_client = clp;
1089 sop->so_seqid = open->op_seqid;
1090 sop->so_confirmed = 0;
1091 rp = &sop->so_replay;
1092 rp->rp_status = NFSERR_SERVERFAULT;
1093 rp->rp_buflen = 0;
1094 rp->rp_buf = rp->rp_ibuf;
1095 return sop;
1096}
1097
1098static void
1099release_stateid_lockowners(struct nfs4_stateid *open_stp)
1100{
1101 struct nfs4_stateowner *lock_sop;
1102
NeilBrownea1da632005-06-23 22:04:17 -07001103 while (!list_empty(&open_stp->st_lockowners)) {
1104 lock_sop = list_entry(open_stp->st_lockowners.next,
1105 struct nfs4_stateowner, so_perstateid);
1106 /* list_del(&open_stp->st_lockowners); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 BUG_ON(lock_sop->so_is_open_owner);
1108 release_stateowner(lock_sop);
1109 }
1110}
1111
1112static void
1113unhash_stateowner(struct nfs4_stateowner *sop)
1114{
1115 struct nfs4_stateid *stp;
1116
1117 list_del(&sop->so_idhash);
1118 list_del(&sop->so_strhash);
NeilBrown6fa305d2005-06-23 22:03:06 -07001119 if (sop->so_is_open_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 list_del(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07001121 list_del(&sop->so_perstateid);
1122 while (!list_empty(&sop->so_stateids)) {
1123 stp = list_entry(sop->so_stateids.next,
1124 struct nfs4_stateid, st_perstateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 if (sop->so_is_open_owner)
1126 release_stateid(stp, OPEN_STATE);
1127 else
1128 release_stateid(stp, LOCK_STATE);
1129 }
1130}
1131
1132static void
1133release_stateowner(struct nfs4_stateowner *sop)
1134{
1135 unhash_stateowner(sop);
1136 list_del(&sop->so_close_lru);
1137 nfs4_put_stateowner(sop);
1138}
1139
1140static inline void
1141init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1142 struct nfs4_stateowner *sop = open->op_stateowner;
1143 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1144
1145 INIT_LIST_HEAD(&stp->st_hash);
NeilBrownea1da632005-06-23 22:04:17 -07001146 INIT_LIST_HEAD(&stp->st_perstateowner);
1147 INIT_LIST_HEAD(&stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 INIT_LIST_HEAD(&stp->st_perfile);
1149 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
NeilBrownea1da632005-06-23 22:04:17 -07001150 list_add(&stp->st_perstateowner, &sop->so_stateids);
NeilBrown8beefa22005-06-23 22:03:08 -07001151 list_add(&stp->st_perfile, &fp->fi_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07001153 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 stp->st_file = fp;
1155 stp->st_stateid.si_boot = boot_time;
1156 stp->st_stateid.si_stateownerid = sop->so_id;
1157 stp->st_stateid.si_fileid = fp->fi_id;
1158 stp->st_stateid.si_generation = 0;
1159 stp->st_access_bmap = 0;
1160 stp->st_deny_bmap = 0;
1161 __set_bit(open->op_share_access, &stp->st_access_bmap);
1162 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1163}
1164
1165static void
1166release_stateid(struct nfs4_stateid *stp, int flags)
1167{
1168 struct file *filp = stp->st_vfs_file;
1169
1170 list_del(&stp->st_hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 list_del(&stp->st_perfile);
NeilBrownea1da632005-06-23 22:04:17 -07001172 list_del(&stp->st_perstateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 if (flags & OPEN_STATE) {
1174 release_stateid_lockowners(stp);
1175 stp->st_vfs_file = NULL;
1176 nfsd_close(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 } else if (flags & LOCK_STATE)
1178 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
NeilBrown13cd2182005-06-23 22:03:10 -07001179 put_nfs4_file(stp->st_file);
NeilBrown5ac049a2005-06-23 22:03:03 -07001180 kmem_cache_free(stateid_slab, stp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 stp = NULL;
1182}
1183
NeilBrownfd39ca92005-06-23 22:04:03 -07001184static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185move_to_close_lru(struct nfs4_stateowner *sop)
1186{
1187 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1188
1189 unhash_stateowner(sop);
1190 list_add_tail(&sop->so_close_lru, &close_lru);
1191 sop->so_time = get_seconds();
1192}
1193
NeilBrownfd39ca92005-06-23 22:04:03 -07001194static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195release_state_owner(struct nfs4_stateid *stp, int flag)
1196{
1197 struct nfs4_stateowner *sop = stp->st_stateowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
1199 dprintk("NFSD: release_state_owner\n");
1200 release_stateid(stp, flag);
1201
1202 /* place unused nfs4_stateowners on so_close_lru list to be
1203 * released by the laundromat service after the lease period
1204 * to enable us to handle CLOSE replay
1205 */
NeilBrownea1da632005-06-23 22:04:17 -07001206 if (sop->so_confirmed && list_empty(&sop->so_stateids))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 move_to_close_lru(sop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208}
1209
1210static int
1211cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1212 return ((sop->so_owner.len == owner->len) &&
1213 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1214 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1215}
1216
1217static struct nfs4_stateowner *
1218find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1219{
1220 struct nfs4_stateowner *so = NULL;
1221
1222 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1223 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1224 return so;
1225 }
1226 return NULL;
1227}
1228
1229/* search file_hashtbl[] for file */
1230static struct nfs4_file *
1231find_file(struct inode *ino)
1232{
1233 unsigned int hashval = file_hashval(ino);
1234 struct nfs4_file *fp;
1235
1236 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
NeilBrown13cd2182005-06-23 22:03:10 -07001237 if (fp->fi_inode == ino) {
1238 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 return fp;
NeilBrown13cd2182005-06-23 22:03:10 -07001240 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 }
1242 return NULL;
1243}
1244
1245#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1246#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1247
NeilBrownfd39ca92005-06-23 22:04:03 -07001248static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249set_access(unsigned int *access, unsigned long bmap) {
1250 int i;
1251
1252 *access = 0;
1253 for (i = 1; i < 4; i++) {
1254 if (test_bit(i, &bmap))
1255 *access |= i;
1256 }
1257}
1258
NeilBrownfd39ca92005-06-23 22:04:03 -07001259static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260set_deny(unsigned int *deny, unsigned long bmap) {
1261 int i;
1262
1263 *deny = 0;
1264 for (i = 0; i < 4; i++) {
1265 if (test_bit(i, &bmap))
1266 *deny |= i ;
1267 }
1268}
1269
1270static int
1271test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1272 unsigned int access, deny;
1273
1274 set_access(&access, stp->st_access_bmap);
1275 set_deny(&deny, stp->st_deny_bmap);
1276 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1277 return 0;
1278 return 1;
1279}
1280
1281/*
1282 * Called to check deny when READ with all zero stateid or
1283 * WRITE with all zero or all one stateid
1284 */
NeilBrownfd39ca92005-06-23 22:04:03 -07001285static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1287{
1288 struct inode *ino = current_fh->fh_dentry->d_inode;
1289 struct nfs4_file *fp;
1290 struct nfs4_stateid *stp;
NeilBrown13cd2182005-06-23 22:03:10 -07001291 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
1293 dprintk("NFSD: nfs4_share_conflict\n");
1294
1295 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07001296 if (!fp)
1297 return nfs_ok;
1298 ret = nfserr_share_denied;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 /* Search for conflicting share reservations */
NeilBrown13cd2182005-06-23 22:03:10 -07001300 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1301 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1302 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1303 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 }
NeilBrown13cd2182005-06-23 22:03:10 -07001305 ret = nfs_ok;
1306out:
1307 put_nfs4_file(fp);
1308 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309}
1310
1311static inline void
1312nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1313{
1314 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1315 put_write_access(filp->f_dentry->d_inode);
1316 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1317 }
1318}
1319
1320/*
1321 * Recall a delegation
1322 */
1323static int
1324do_recall(void *__dp)
1325{
1326 struct nfs4_delegation *dp = __dp;
1327
1328 daemonize("nfsv4-recall");
1329
1330 nfsd4_cb_recall(dp);
1331 return 0;
1332}
1333
1334/*
1335 * Spawn a thread to perform a recall on the delegation represented
1336 * by the lease (file_lock)
1337 *
1338 * Called from break_lease() with lock_kernel() held.
1339 * Note: we assume break_lease will only call this *once* for any given
1340 * lease.
1341 */
1342static
1343void nfsd_break_deleg_cb(struct file_lock *fl)
1344{
1345 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1346 struct task_struct *t;
1347
1348 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1349 if (!dp)
1350 return;
1351
1352 /* We're assuming the state code never drops its reference
1353 * without first removing the lease. Since we're in this lease
1354 * callback (and since the lease code is serialized by the kernel
1355 * lock) we know the server hasn't removed the lease yet, we know
1356 * it's safe to take a reference: */
1357 atomic_inc(&dp->dl_count);
1358
1359 spin_lock(&recall_lock);
1360 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1361 spin_unlock(&recall_lock);
1362
1363 /* only place dl_time is set. protected by lock_kernel*/
1364 dp->dl_time = get_seconds();
1365
1366 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1367 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1368
1369 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1370 if (IS_ERR(t)) {
1371 struct nfs4_client *clp = dp->dl_client;
1372
1373 printk(KERN_INFO "NFSD: Callback thread failed for "
1374 "for client (clientid %08x/%08x)\n",
1375 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1376 nfs4_put_delegation(dp);
1377 }
1378}
1379
1380/*
1381 * The file_lock is being reapd.
1382 *
1383 * Called by locks_free_lock() with lock_kernel() held.
1384 */
1385static
1386void nfsd_release_deleg_cb(struct file_lock *fl)
1387{
1388 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1389
1390 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1391
1392 if (!(fl->fl_flags & FL_LEASE) || !dp)
1393 return;
1394 dp->dl_flock = NULL;
1395}
1396
1397/*
1398 * Set the delegation file_lock back pointer.
1399 *
1400 * Called from __setlease() with lock_kernel() held.
1401 */
1402static
1403void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1404{
1405 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1406
1407 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1408 if (!dp)
1409 return;
1410 dp->dl_flock = new;
1411}
1412
1413/*
1414 * Called from __setlease() with lock_kernel() held
1415 */
1416static
1417int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1418{
1419 struct nfs4_delegation *onlistd =
1420 (struct nfs4_delegation *)onlist->fl_owner;
1421 struct nfs4_delegation *tryd =
1422 (struct nfs4_delegation *)try->fl_owner;
1423
1424 if (onlist->fl_lmops != try->fl_lmops)
1425 return 0;
1426
1427 return onlistd->dl_client == tryd->dl_client;
1428}
1429
1430
1431static
1432int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1433{
1434 if (arg & F_UNLCK)
1435 return lease_modify(onlist, arg);
1436 else
1437 return -EAGAIN;
1438}
1439
NeilBrownfd39ca92005-06-23 22:04:03 -07001440static struct lock_manager_operations nfsd_lease_mng_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 .fl_break = nfsd_break_deleg_cb,
1442 .fl_release_private = nfsd_release_deleg_cb,
1443 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1444 .fl_mylease = nfsd_same_client_deleg_cb,
1445 .fl_change = nfsd_change_deleg_cb,
1446};
1447
1448
1449/*
1450 * nfsd4_process_open1()
1451 * lookup stateowner.
1452 * found:
1453 * check confirmed
1454 * confirmed:
1455 * check seqid
1456 * not confirmed:
1457 * delete owner
1458 * create new owner
1459 * notfound:
1460 * verify clientid
1461 * create new owner
1462 *
1463 * called with nfs4_lock_state() held.
1464 */
1465int
1466nfsd4_process_open1(struct nfsd4_open *open)
1467{
1468 int status;
1469 clientid_t *clientid = &open->op_clientid;
1470 struct nfs4_client *clp = NULL;
1471 unsigned int strhashval;
1472 struct nfs4_stateowner *sop = NULL;
1473
1474 status = nfserr_inval;
1475 if (!check_name(open->op_owner))
1476 goto out;
1477
1478 if (STALE_CLIENTID(&open->op_clientid))
1479 return nfserr_stale_clientid;
1480
1481 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1482 sop = find_openstateowner_str(strhashval, open);
1483 if (sop) {
1484 open->op_stateowner = sop;
1485 /* check for replay */
1486 if (open->op_seqid == sop->so_seqid){
1487 if (sop->so_replay.rp_buflen)
1488 return NFSERR_REPLAY_ME;
1489 else {
1490 /* The original OPEN failed so spectacularly
1491 * that we don't even have replay data saved!
1492 * Therefore, we have no choice but to continue
1493 * processing this OPEN; presumably, we'll
1494 * fail again for the same reason.
1495 */
1496 dprintk("nfsd4_process_open1:"
1497 " replay with no replay cache\n");
1498 goto renew;
1499 }
1500 } else if (sop->so_confirmed) {
1501 if (open->op_seqid == sop->so_seqid + 1)
1502 goto renew;
1503 status = nfserr_bad_seqid;
1504 goto out;
1505 } else {
1506 /* If we get here, we received an OPEN for an
1507 * unconfirmed nfs4_stateowner. Since the seqid's are
1508 * different, purge the existing nfs4_stateowner, and
1509 * instantiate a new one.
1510 */
1511 clp = sop->so_client;
1512 release_stateowner(sop);
1513 }
1514 } else {
1515 /* nfs4_stateowner not found.
1516 * Verify clientid and instantiate new nfs4_stateowner.
1517 * If verify fails this is presumably the result of the
1518 * client's lease expiring.
1519 */
1520 status = nfserr_expired;
1521 clp = find_confirmed_client(clientid);
1522 if (clp == NULL)
1523 goto out;
1524 }
1525 status = nfserr_resource;
1526 sop = alloc_init_open_stateowner(strhashval, clp, open);
1527 if (sop == NULL)
1528 goto out;
1529 open->op_stateowner = sop;
1530renew:
1531 status = nfs_ok;
1532 renew_client(sop->so_client);
1533out:
1534 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1535 status = nfserr_reclaim_bad;
1536 return status;
1537}
1538
NeilBrown4a6e43e2005-06-23 22:02:50 -07001539static inline int
1540nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1541{
1542 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1543 return nfserr_openmode;
1544 else
1545 return nfs_ok;
1546}
1547
NeilBrown52f4fb42005-06-23 22:02:49 -07001548static struct nfs4_delegation *
1549find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1550{
1551 struct nfs4_delegation *dp;
1552
NeilBrownea1da632005-06-23 22:04:17 -07001553 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
NeilBrown52f4fb42005-06-23 22:02:49 -07001554 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1555 return dp;
1556 }
1557 return NULL;
1558}
1559
NeilBrownc44c5ee2005-06-23 22:02:54 -07001560static int
NeilBrown567d9822005-06-23 22:02:53 -07001561nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1562 struct nfs4_delegation **dp)
1563{
1564 int flags;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001565 int status = nfserr_bad_stateid;
NeilBrown567d9822005-06-23 22:02:53 -07001566
1567 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1568 if (*dp == NULL)
NeilBrownc44c5ee2005-06-23 22:02:54 -07001569 goto out;
NeilBrown567d9822005-06-23 22:02:53 -07001570 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1571 RD_STATE : WR_STATE;
1572 status = nfs4_check_delegmode(*dp, flags);
1573 if (status)
1574 *dp = NULL;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001575out:
1576 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1577 return nfs_ok;
1578 if (status)
1579 return status;
1580 open->op_stateowner->so_confirmed = 1;
1581 return nfs_ok;
NeilBrown567d9822005-06-23 22:02:53 -07001582}
1583
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584static int
1585nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1586{
1587 struct nfs4_stateid *local;
1588 int status = nfserr_share_denied;
1589 struct nfs4_stateowner *sop = open->op_stateowner;
1590
NeilBrown8beefa22005-06-23 22:03:08 -07001591 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 /* ignore lock owners */
1593 if (local->st_stateowner->so_is_open_owner == 0)
1594 continue;
1595 /* remember if we have seen this open owner */
1596 if (local->st_stateowner == sop)
1597 *stpp = local;
1598 /* check for conflicting share reservations */
1599 if (!test_share(local, open))
1600 goto out;
1601 }
1602 status = 0;
1603out:
1604 return status;
1605}
1606
NeilBrown5ac049a2005-06-23 22:03:03 -07001607static inline struct nfs4_stateid *
1608nfs4_alloc_stateid(void)
1609{
1610 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1611}
1612
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613static int
1614nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
NeilBrown567d9822005-06-23 22:02:53 -07001615 struct nfs4_delegation *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 struct svc_fh *cur_fh, int flags)
1617{
1618 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619
NeilBrown5ac049a2005-06-23 22:03:03 -07001620 stp = nfs4_alloc_stateid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 if (stp == NULL)
1622 return nfserr_resource;
1623
NeilBrown567d9822005-06-23 22:02:53 -07001624 if (dp) {
1625 get_file(dp->dl_vfs_file);
1626 stp->st_vfs_file = dp->dl_vfs_file;
1627 } else {
1628 int status;
1629 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1630 &stp->st_vfs_file);
1631 if (status) {
1632 if (status == nfserr_dropit)
1633 status = nfserr_jukebox;
NeilBrown5ac049a2005-06-23 22:03:03 -07001634 kmem_cache_free(stateid_slab, stp);
NeilBrown567d9822005-06-23 22:02:53 -07001635 return status;
1636 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 *stpp = stp;
1639 return 0;
1640}
1641
1642static inline int
1643nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1644 struct nfsd4_open *open)
1645{
1646 struct iattr iattr = {
1647 .ia_valid = ATTR_SIZE,
1648 .ia_size = 0,
1649 };
1650 if (!open->op_truncate)
1651 return 0;
1652 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1653 return -EINVAL;
1654 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1655}
1656
1657static int
1658nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1659{
1660 struct file *filp = stp->st_vfs_file;
1661 struct inode *inode = filp->f_dentry->d_inode;
1662 unsigned int share_access;
1663 int status;
1664
1665 set_access(&share_access, stp->st_access_bmap);
1666 share_access = ~share_access;
1667 share_access &= open->op_share_access;
1668
1669 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1670 return nfsd4_truncate(rqstp, cur_fh, open);
1671
1672 status = get_write_access(inode);
1673 if (status)
1674 return nfserrno(status);
1675 status = nfsd4_truncate(rqstp, cur_fh, open);
1676 if (status) {
1677 put_write_access(inode);
1678 return status;
1679 }
1680 /* remember the open */
1681 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1682 set_bit(open->op_share_access, &stp->st_access_bmap);
1683 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1684
1685 return nfs_ok;
1686}
1687
1688
1689/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1690static void
1691nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1692{
1693 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1694 if (*status)
1695 *status = nfserr_reclaim_bad;
1696 else {
1697 open->op_stateowner->so_confirmed = 1;
NeilBrownc7b9a452005-06-23 22:04:30 -07001698 open->op_stateowner->so_client->cl_firststate = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 open->op_stateowner->so_seqid--;
1700 }
1701 }
1702}
1703
1704/*
1705 * Attempt to hand out a delegation.
1706 */
1707static void
1708nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1709{
1710 struct nfs4_delegation *dp;
1711 struct nfs4_stateowner *sop = stp->st_stateowner;
1712 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1713 struct file_lock fl, *flp = &fl;
1714 int status, flag = 0;
1715
1716 flag = NFS4_OPEN_DELEGATE_NONE;
NeilBrown7b190fe2005-06-23 22:03:23 -07001717 open->op_recall = 0;
1718 switch (open->op_claim_type) {
1719 case NFS4_OPEN_CLAIM_PREVIOUS:
1720 if (!atomic_read(&cb->cb_set))
1721 open->op_recall = 1;
1722 flag = open->op_delegate_type;
1723 if (flag == NFS4_OPEN_DELEGATE_NONE)
1724 goto out;
1725 break;
1726 case NFS4_OPEN_CLAIM_NULL:
1727 /* Let's not give out any delegations till everyone's
1728 * had the chance to reclaim theirs.... */
1729 if (nfs4_in_grace())
1730 goto out;
1731 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1732 goto out;
1733 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1734 flag = NFS4_OPEN_DELEGATE_WRITE;
1735 else
1736 flag = NFS4_OPEN_DELEGATE_READ;
1737 break;
1738 default:
1739 goto out;
1740 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741
1742 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1743 if (dp == NULL) {
1744 flag = NFS4_OPEN_DELEGATE_NONE;
1745 goto out;
1746 }
1747 locks_init_lock(&fl);
1748 fl.fl_lmops = &nfsd_lease_mng_ops;
1749 fl.fl_flags = FL_LEASE;
1750 fl.fl_end = OFFSET_MAX;
1751 fl.fl_owner = (fl_owner_t)dp;
1752 fl.fl_file = stp->st_vfs_file;
1753 fl.fl_pid = current->tgid;
1754
1755 /* setlease checks to see if delegation should be handed out.
1756 * the lock_manager callbacks fl_mylease and fl_change are used
1757 */
1758 if ((status = setlease(stp->st_vfs_file,
1759 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1760 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
NeilBrownc9071322005-04-16 15:26:38 -07001761 unhash_delegation(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762 flag = NFS4_OPEN_DELEGATE_NONE;
1763 goto out;
1764 }
1765
1766 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1767
1768 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1769 dp->dl_stateid.si_boot,
1770 dp->dl_stateid.si_stateownerid,
1771 dp->dl_stateid.si_fileid,
1772 dp->dl_stateid.si_generation);
1773out:
NeilBrown7b190fe2005-06-23 22:03:23 -07001774 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1775 && flag == NFS4_OPEN_DELEGATE_NONE
1776 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1777 printk("NFSD: WARNING: refusing delegation reclaim\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 open->op_delegate_type = flag;
1779}
1780
1781/*
1782 * called with nfs4_lock_state() held.
1783 */
1784int
1785nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1786{
1787 struct nfs4_file *fp = NULL;
1788 struct inode *ino = current_fh->fh_dentry->d_inode;
1789 struct nfs4_stateid *stp = NULL;
NeilBrown567d9822005-06-23 22:02:53 -07001790 struct nfs4_delegation *dp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 int status;
1792
NeilBrownb6483302005-07-07 17:59:15 -07001793 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1794 return nfserr_grace;
1795
1796 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1797 return nfserr_no_grace;
1798
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 status = nfserr_inval;
1800 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1801 goto out;
1802 /*
1803 * Lookup file; if found, lookup stateid and check open request,
1804 * and check for delegations in the process of being recalled.
1805 * If not found, create the nfs4_file struct
1806 */
1807 fp = find_file(ino);
1808 if (fp) {
1809 if ((status = nfs4_check_open(fp, open, &stp)))
1810 goto out;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001811 status = nfs4_check_deleg(fp, open, &dp);
1812 if (status)
1813 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814 } else {
NeilBrownc44c5ee2005-06-23 22:02:54 -07001815 status = nfserr_bad_stateid;
1816 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1817 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 status = nfserr_resource;
1819 fp = alloc_init_file(ino);
1820 if (fp == NULL)
1821 goto out;
1822 }
1823
1824 /*
1825 * OPEN the file, or upgrade an existing OPEN.
1826 * If truncate fails, the OPEN fails.
1827 */
1828 if (stp) {
1829 /* Stateid was found, this is an OPEN upgrade */
1830 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1831 if (status)
1832 goto out;
1833 } else {
1834 /* Stateid was not found, this is a new OPEN */
1835 int flags = 0;
1836 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1837 flags = MAY_WRITE;
1838 else
1839 flags = MAY_READ;
NeilBrown567d9822005-06-23 22:02:53 -07001840 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1841 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 goto out;
1843 init_stateid(stp, fp, open);
1844 status = nfsd4_truncate(rqstp, current_fh, open);
1845 if (status) {
1846 release_stateid(stp, OPEN_STATE);
1847 goto out;
1848 }
1849 }
1850 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1851
1852 /*
1853 * Attempt to hand out a delegation. No error return, because the
1854 * OPEN succeeds even if we fail.
1855 */
1856 nfs4_open_delegation(current_fh, open, stp);
1857
1858 status = nfs_ok;
1859
1860 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1861 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1862 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1863out:
NeilBrown13cd2182005-06-23 22:03:10 -07001864 if (fp)
1865 put_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 /* CLAIM_PREVIOUS has different error returns */
1867 nfs4_set_claim_prev(open, &status);
1868 /*
1869 * To finish the open response, we just need to set the rflags.
1870 */
1871 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1872 if (!open->op_stateowner->so_confirmed)
1873 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1874
1875 return status;
1876}
1877
NeilBrown58da2822005-06-23 22:03:19 -07001878static struct workqueue_struct *laundry_wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879static struct work_struct laundromat_work;
1880static void laundromat_main(void *);
1881static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1882
1883int
1884nfsd4_renew(clientid_t *clid)
1885{
1886 struct nfs4_client *clp;
1887 int status;
1888
1889 nfs4_lock_state();
1890 dprintk("process_renew(%08x/%08x): starting\n",
1891 clid->cl_boot, clid->cl_id);
1892 status = nfserr_stale_clientid;
1893 if (STALE_CLIENTID(clid))
1894 goto out;
1895 clp = find_confirmed_client(clid);
1896 status = nfserr_expired;
1897 if (clp == NULL) {
1898 /* We assume the client took too long to RENEW. */
1899 dprintk("nfsd4_renew: clientid not found!\n");
1900 goto out;
1901 }
1902 renew_client(clp);
1903 status = nfserr_cb_path_down;
NeilBrownea1da632005-06-23 22:04:17 -07001904 if (!list_empty(&clp->cl_delegations)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 && !atomic_read(&clp->cl_callback.cb_set))
1906 goto out;
1907 status = nfs_ok;
1908out:
1909 nfs4_unlock_state();
1910 return status;
1911}
1912
NeilBrowna76b4312005-06-23 22:04:01 -07001913static void
1914end_grace(void)
1915{
1916 dprintk("NFSD: end of grace period\n");
NeilBrownc7b9a452005-06-23 22:04:30 -07001917 nfsd4_recdir_purge_old();
NeilBrowna76b4312005-06-23 22:04:01 -07001918 in_grace = 0;
1919}
1920
NeilBrownfd39ca92005-06-23 22:04:03 -07001921static time_t
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922nfs4_laundromat(void)
1923{
1924 struct nfs4_client *clp;
1925 struct nfs4_stateowner *sop;
1926 struct nfs4_delegation *dp;
1927 struct list_head *pos, *next, reaplist;
1928 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1929 time_t t, clientid_val = NFSD_LEASE_TIME;
1930 time_t u, test_val = NFSD_LEASE_TIME;
1931
1932 nfs4_lock_state();
1933
1934 dprintk("NFSD: laundromat service - starting\n");
NeilBrowna76b4312005-06-23 22:04:01 -07001935 if (in_grace)
1936 end_grace();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 list_for_each_safe(pos, next, &client_lru) {
1938 clp = list_entry(pos, struct nfs4_client, cl_lru);
1939 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1940 t = clp->cl_time - cutoff;
1941 if (clientid_val > t)
1942 clientid_val = t;
1943 break;
1944 }
1945 dprintk("NFSD: purging unused client (clientid %08x)\n",
1946 clp->cl_clientid.cl_id);
NeilBrownc7b9a452005-06-23 22:04:30 -07001947 nfsd4_remove_clid_dir(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 expire_client(clp);
1949 }
1950 INIT_LIST_HEAD(&reaplist);
1951 spin_lock(&recall_lock);
1952 list_for_each_safe(pos, next, &del_recall_lru) {
1953 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1954 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1955 u = dp->dl_time - cutoff;
1956 if (test_val > u)
1957 test_val = u;
1958 break;
1959 }
1960 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1961 dp, dp->dl_flock);
1962 list_move(&dp->dl_recall_lru, &reaplist);
1963 }
1964 spin_unlock(&recall_lock);
1965 list_for_each_safe(pos, next, &reaplist) {
1966 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1967 list_del_init(&dp->dl_recall_lru);
1968 unhash_delegation(dp);
1969 }
1970 test_val = NFSD_LEASE_TIME;
1971 list_for_each_safe(pos, next, &close_lru) {
1972 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1973 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1974 u = sop->so_time - cutoff;
1975 if (test_val > u)
1976 test_val = u;
1977 break;
1978 }
1979 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1980 sop->so_id);
1981 list_del(&sop->so_close_lru);
1982 nfs4_put_stateowner(sop);
1983 }
1984 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1985 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1986 nfs4_unlock_state();
1987 return clientid_val;
1988}
1989
1990void
1991laundromat_main(void *not_used)
1992{
1993 time_t t;
1994
1995 t = nfs4_laundromat();
1996 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
NeilBrown58da2822005-06-23 22:03:19 -07001997 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998}
1999
2000/* search ownerid_hashtbl[] and close_lru for stateid owner
2001 * (stateid->si_stateownerid)
2002 */
NeilBrownfd39ca92005-06-23 22:04:03 -07002003static struct nfs4_stateowner *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004find_openstateowner_id(u32 st_id, int flags) {
2005 struct nfs4_stateowner *local = NULL;
2006
2007 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2008 if (flags & CLOSE_STATE) {
2009 list_for_each_entry(local, &close_lru, so_close_lru) {
2010 if (local->so_id == st_id)
2011 return local;
2012 }
2013 }
2014 return NULL;
2015}
2016
2017static inline int
2018nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2019{
2020 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2021}
2022
2023static int
2024STALE_STATEID(stateid_t *stateid)
2025{
2026 if (stateid->si_boot == boot_time)
2027 return 0;
2028 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2029 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2030 stateid->si_generation);
2031 return 1;
2032}
2033
2034static inline int
2035access_permit_read(unsigned long access_bmap)
2036{
2037 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2038 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2039 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2040}
2041
2042static inline int
2043access_permit_write(unsigned long access_bmap)
2044{
2045 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2046 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2047}
2048
2049static
2050int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2051{
2052 int status = nfserr_openmode;
2053
2054 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2055 goto out;
2056 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2057 goto out;
2058 status = nfs_ok;
2059out:
2060 return status;
2061}
2062
2063static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2065{
2066 /* Trying to call delegreturn with a special stateid? Yuch: */
2067 if (!(flags & (RD_STATE | WR_STATE)))
2068 return nfserr_bad_stateid;
2069 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2070 return nfs_ok;
2071 else if (nfs4_in_grace()) {
2072 /* Answer in remaining cases depends on existance of
2073 * conflicting state; so we must wait out the grace period. */
2074 return nfserr_grace;
2075 } else if (flags & WR_STATE)
2076 return nfs4_share_conflict(current_fh,
2077 NFS4_SHARE_DENY_WRITE);
2078 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2079 return nfs4_share_conflict(current_fh,
2080 NFS4_SHARE_DENY_READ);
2081}
2082
2083/*
2084 * Allow READ/WRITE during grace period on recovered state only for files
2085 * that are not able to provide mandatory locking.
2086 */
2087static inline int
2088io_during_grace_disallowed(struct inode *inode, int flags)
2089{
2090 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2091 && MANDATORY_LOCK(inode);
2092}
2093
2094/*
2095* Checks for stateid operations
2096*/
2097int
2098nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2099{
2100 struct nfs4_stateid *stp = NULL;
2101 struct nfs4_delegation *dp = NULL;
2102 stateid_t *stidp;
2103 struct inode *ino = current_fh->fh_dentry->d_inode;
2104 int status;
2105
2106 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2107 stateid->si_boot, stateid->si_stateownerid,
2108 stateid->si_fileid, stateid->si_generation);
2109 if (filpp)
2110 *filpp = NULL;
2111
2112 if (io_during_grace_disallowed(ino, flags))
2113 return nfserr_grace;
2114
2115 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2116 return check_special_stateids(current_fh, stateid, flags);
2117
2118 /* STALE STATEID */
2119 status = nfserr_stale_stateid;
2120 if (STALE_STATEID(stateid))
2121 goto out;
2122
2123 /* BAD STATEID */
2124 status = nfserr_bad_stateid;
2125 if (!stateid->si_fileid) { /* delegation stateid */
2126 if(!(dp = find_delegation_stateid(ino, stateid))) {
2127 dprintk("NFSD: delegation stateid not found\n");
2128 if (nfs4_in_grace())
2129 status = nfserr_grace;
2130 goto out;
2131 }
2132 stidp = &dp->dl_stateid;
2133 } else { /* open or lock stateid */
2134 if (!(stp = find_stateid(stateid, flags))) {
2135 dprintk("NFSD: open or lock stateid not found\n");
2136 if (nfs4_in_grace())
2137 status = nfserr_grace;
2138 goto out;
2139 }
2140 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2141 goto out;
2142 if (!stp->st_stateowner->so_confirmed)
2143 goto out;
2144 stidp = &stp->st_stateid;
2145 }
2146 if (stateid->si_generation > stidp->si_generation)
2147 goto out;
2148
2149 /* OLD STATEID */
2150 status = nfserr_old_stateid;
2151 if (stateid->si_generation < stidp->si_generation)
2152 goto out;
2153 if (stp) {
2154 if ((status = nfs4_check_openmode(stp,flags)))
2155 goto out;
2156 renew_client(stp->st_stateowner->so_client);
2157 if (filpp)
2158 *filpp = stp->st_vfs_file;
2159 } else if (dp) {
2160 if ((status = nfs4_check_delegmode(dp, flags)))
2161 goto out;
2162 renew_client(dp->dl_client);
2163 if (flags & DELEG_RET)
2164 unhash_delegation(dp);
2165 if (filpp)
2166 *filpp = dp->dl_vfs_file;
2167 }
2168 status = nfs_ok;
2169out:
2170 return status;
2171}
2172
2173
2174/*
2175 * Checks for sequence id mutating operations.
2176 */
NeilBrownfd39ca92005-06-23 22:04:03 -07002177static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178nfs4_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)
2179{
2180 int status;
2181 struct nfs4_stateid *stp;
2182 struct nfs4_stateowner *sop;
2183
2184 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2185 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2186 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2187 stateid->si_generation);
2188
2189 *stpp = NULL;
2190 *sopp = NULL;
2191
2192 status = nfserr_bad_stateid;
2193 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2194 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2195 goto out;
2196 }
2197
2198 status = nfserr_stale_stateid;
2199 if (STALE_STATEID(stateid))
2200 goto out;
2201 /*
2202 * We return BAD_STATEID if filehandle doesn't match stateid,
2203 * the confirmed flag is incorrecly set, or the generation
2204 * number is incorrect.
2205 * If there is no entry in the openfile table for this id,
2206 * we can't always return BAD_STATEID;
2207 * this might be a retransmitted CLOSE which has arrived after
2208 * the openfile has been released.
2209 */
2210 if (!(stp = find_stateid(stateid, flags)))
2211 goto no_nfs4_stateid;
2212
2213 status = nfserr_bad_stateid;
2214
2215 /* for new lock stateowners:
2216 * check that the lock->v.new.open_stateid
2217 * refers to an open stateowner
2218 *
2219 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2220 * as the open_stateid->st_stateowner->so_client->clientid
2221 */
2222 if (lockclid) {
2223 struct nfs4_stateowner *sop = stp->st_stateowner;
2224 struct nfs4_client *clp = sop->so_client;
2225
2226 if (!sop->so_is_open_owner)
2227 goto out;
2228 if (!cmp_clid(&clp->cl_clientid, lockclid))
2229 goto out;
2230 }
2231
2232 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2233 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2234 goto out;
2235 }
2236
2237 *stpp = stp;
2238 *sopp = sop = stp->st_stateowner;
2239
2240 /*
2241 * We now validate the seqid and stateid generation numbers.
2242 * For the moment, we ignore the possibility of
2243 * generation number wraparound.
2244 */
2245 if (seqid != sop->so_seqid + 1)
2246 goto check_replay;
2247
2248 if (sop->so_confirmed) {
2249 if (flags & CONFIRM) {
2250 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2251 goto out;
2252 }
2253 }
2254 else {
2255 if (!(flags & CONFIRM)) {
2256 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2257 goto out;
2258 }
2259 }
2260 if (stateid->si_generation > stp->st_stateid.si_generation) {
2261 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2262 goto out;
2263 }
2264
2265 status = nfserr_old_stateid;
2266 if (stateid->si_generation < stp->st_stateid.si_generation) {
2267 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2268 goto out;
2269 }
2270 /* XXX renew the client lease here */
2271 status = nfs_ok;
2272
2273out:
2274 return status;
2275
2276no_nfs4_stateid:
2277
2278 /*
2279 * We determine whether this is a bad stateid or a replay,
2280 * starting by trying to look up the stateowner.
2281 * If stateowner is not found - stateid is bad.
2282 */
2283 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2284 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2285 status = nfserr_bad_stateid;
2286 goto out;
2287 }
2288 *sopp = sop;
2289
2290check_replay:
2291 if (seqid == sop->so_seqid) {
2292 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2293 /* indicate replay to calling function */
2294 status = NFSERR_REPLAY_ME;
2295 } else {
2296 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2297
2298 *sopp = NULL;
2299 status = nfserr_bad_seqid;
2300 }
2301 goto out;
2302}
2303
2304int
2305nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2306{
2307 int status;
2308 struct nfs4_stateowner *sop;
2309 struct nfs4_stateid *stp;
2310
2311 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2312 (int)current_fh->fh_dentry->d_name.len,
2313 current_fh->fh_dentry->d_name.name);
2314
2315 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2316 goto out;
2317
2318 nfs4_lock_state();
2319
2320 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2321 &oc->oc_req_stateid,
2322 CHECK_FH | CONFIRM | OPEN_STATE,
2323 &oc->oc_stateowner, &stp, NULL)))
2324 goto out;
2325
2326 sop = oc->oc_stateowner;
2327 sop->so_confirmed = 1;
2328 update_stateid(&stp->st_stateid);
2329 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2330 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2331 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2332 stp->st_stateid.si_boot,
2333 stp->st_stateid.si_stateownerid,
2334 stp->st_stateid.si_fileid,
2335 stp->st_stateid.si_generation);
NeilBrownc7b9a452005-06-23 22:04:30 -07002336
2337 nfsd4_create_clid_dir(sop->so_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338out:
2339 if (oc->oc_stateowner)
2340 nfs4_get_stateowner(oc->oc_stateowner);
2341 nfs4_unlock_state();
2342 return status;
2343}
2344
2345
2346/*
2347 * unset all bits in union bitmap (bmap) that
2348 * do not exist in share (from successful OPEN_DOWNGRADE)
2349 */
2350static void
2351reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2352{
2353 int i;
2354 for (i = 1; i < 4; i++) {
2355 if ((i & access) != i)
2356 __clear_bit(i, bmap);
2357 }
2358}
2359
2360static void
2361reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2362{
2363 int i;
2364 for (i = 0; i < 4; i++) {
2365 if ((i & deny) != i)
2366 __clear_bit(i, bmap);
2367 }
2368}
2369
2370int
2371nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2372{
2373 int status;
2374 struct nfs4_stateid *stp;
2375 unsigned int share_access;
2376
2377 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2378 (int)current_fh->fh_dentry->d_name.len,
2379 current_fh->fh_dentry->d_name.name);
2380
2381 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2382 return nfserr_inval;
2383
2384 nfs4_lock_state();
2385 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2386 &od->od_stateid,
2387 CHECK_FH | OPEN_STATE,
2388 &od->od_stateowner, &stp, NULL)))
2389 goto out;
2390
2391 status = nfserr_inval;
2392 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2393 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2394 stp->st_access_bmap, od->od_share_access);
2395 goto out;
2396 }
2397 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2398 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2399 stp->st_deny_bmap, od->od_share_deny);
2400 goto out;
2401 }
2402 set_access(&share_access, stp->st_access_bmap);
2403 nfs4_file_downgrade(stp->st_vfs_file,
2404 share_access & ~od->od_share_access);
2405
2406 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2407 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2408
2409 update_stateid(&stp->st_stateid);
2410 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2411 status = nfs_ok;
2412out:
2413 if (od->od_stateowner)
2414 nfs4_get_stateowner(od->od_stateowner);
2415 nfs4_unlock_state();
2416 return status;
2417}
2418
2419/*
2420 * nfs4_unlock_state() called after encode
2421 */
2422int
2423nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2424{
2425 int status;
2426 struct nfs4_stateid *stp;
2427
2428 dprintk("NFSD: nfsd4_close on file %.*s\n",
2429 (int)current_fh->fh_dentry->d_name.len,
2430 current_fh->fh_dentry->d_name.name);
2431
2432 nfs4_lock_state();
2433 /* check close_lru for replay */
2434 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2435 &close->cl_stateid,
2436 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2437 &close->cl_stateowner, &stp, NULL)))
2438 goto out;
2439 /*
2440 * Return success, but first update the stateid.
2441 */
2442 status = nfs_ok;
2443 update_stateid(&stp->st_stateid);
2444 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2445
2446 /* release_state_owner() calls nfsd_close() if needed */
2447 release_state_owner(stp, OPEN_STATE);
2448out:
2449 if (close->cl_stateowner)
2450 nfs4_get_stateowner(close->cl_stateowner);
2451 nfs4_unlock_state();
2452 return status;
2453}
2454
2455int
2456nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2457{
2458 int status;
2459
2460 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2461 goto out;
2462
2463 nfs4_lock_state();
2464 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2465 nfs4_unlock_state();
2466out:
2467 return status;
2468}
2469
2470
2471/*
2472 * Lock owner state (byte-range locks)
2473 */
2474#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2475#define LOCK_HASH_BITS 8
2476#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2477#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2478
2479#define lockownerid_hashval(id) \
2480 ((id) & LOCK_HASH_MASK)
2481
2482static inline unsigned int
2483lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2484 struct xdr_netobj *ownername)
2485{
2486 return (file_hashval(inode) + cl_id
2487 + opaque_hashval(ownername->data, ownername->len))
2488 & LOCK_HASH_MASK;
2489}
2490
2491static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2492static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2493static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2494
NeilBrownfd39ca92005-06-23 22:04:03 -07002495static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496find_stateid(stateid_t *stid, int flags)
2497{
2498 struct nfs4_stateid *local = NULL;
2499 u32 st_id = stid->si_stateownerid;
2500 u32 f_id = stid->si_fileid;
2501 unsigned int hashval;
2502
2503 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2504 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2505 hashval = stateid_hashval(st_id, f_id);
2506 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2507 if ((local->st_stateid.si_stateownerid == st_id) &&
2508 (local->st_stateid.si_fileid == f_id))
2509 return local;
2510 }
2511 }
2512 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2513 hashval = stateid_hashval(st_id, f_id);
2514 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2515 if ((local->st_stateid.si_stateownerid == st_id) &&
2516 (local->st_stateid.si_fileid == f_id))
2517 return local;
2518 }
2519 } else
2520 printk("NFSD: find_stateid: ERROR: no state flag\n");
2521 return NULL;
2522}
2523
2524static struct nfs4_delegation *
2525find_delegation_stateid(struct inode *ino, stateid_t *stid)
2526{
NeilBrown13cd2182005-06-23 22:03:10 -07002527 struct nfs4_file *fp;
2528 struct nfs4_delegation *dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529
2530 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2531 stid->si_boot, stid->si_stateownerid,
2532 stid->si_fileid, stid->si_generation);
2533
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07002535 if (!fp)
2536 return NULL;
2537 dl = find_delegation_file(fp, stid);
2538 put_nfs4_file(fp);
2539 return dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540}
2541
2542/*
2543 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2544 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2545 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2546 * locking, this prevents us from being completely protocol-compliant. The
2547 * real solution to this problem is to start using unsigned file offsets in
2548 * the VFS, but this is a very deep change!
2549 */
2550static inline void
2551nfs4_transform_lock_offset(struct file_lock *lock)
2552{
2553 if (lock->fl_start < 0)
2554 lock->fl_start = OFFSET_MAX;
2555 if (lock->fl_end < 0)
2556 lock->fl_end = OFFSET_MAX;
2557}
2558
NeilBrownfd39ca92005-06-23 22:04:03 -07002559static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2561{
2562 struct nfs4_stateowner *local = NULL;
2563 int status = 0;
2564
2565 if (hashval >= LOCK_HASH_SIZE)
2566 goto out;
2567 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2568 if (local == sop) {
2569 status = 1;
2570 goto out;
2571 }
2572 }
2573out:
2574 return status;
2575}
2576
2577
2578static inline void
2579nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2580{
2581 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2582 unsigned int hval = lockownerid_hashval(sop->so_id);
2583
2584 deny->ld_sop = NULL;
2585 if (nfs4_verify_lock_stateowner(sop, hval)) {
2586 kref_get(&sop->so_ref);
2587 deny->ld_sop = sop;
2588 deny->ld_clientid = sop->so_client->cl_clientid;
2589 }
2590 deny->ld_start = fl->fl_start;
2591 deny->ld_length = ~(u64)0;
2592 if (fl->fl_end != ~(u64)0)
2593 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2594 deny->ld_type = NFS4_READ_LT;
2595 if (fl->fl_type != F_RDLCK)
2596 deny->ld_type = NFS4_WRITE_LT;
2597}
2598
2599static struct nfs4_stateowner *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2601 struct xdr_netobj *owner)
2602{
2603 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2604 struct nfs4_stateowner *op;
2605
2606 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2607 if (cmp_owner_str(op, owner, clid))
2608 return op;
2609 }
2610 return NULL;
2611}
2612
2613/*
2614 * Alloc a lock owner structure.
2615 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2616 * occured.
2617 *
2618 * strhashval = lock_ownerstr_hashval
2619 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2620 */
2621
2622static struct nfs4_stateowner *
2623alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2624 struct nfs4_stateowner *sop;
2625 struct nfs4_replay *rp;
2626 unsigned int idhashval;
2627
2628 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2629 return NULL;
2630 idhashval = lockownerid_hashval(current_ownerid);
2631 INIT_LIST_HEAD(&sop->so_idhash);
2632 INIT_LIST_HEAD(&sop->so_strhash);
2633 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07002634 INIT_LIST_HEAD(&sop->so_stateids);
2635 INIT_LIST_HEAD(&sop->so_perstateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2637 sop->so_time = 0;
2638 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2639 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07002640 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 sop->so_is_open_owner = 0;
2642 sop->so_id = current_ownerid++;
2643 sop->so_client = clp;
2644 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2645 sop->so_confirmed = 1;
2646 rp = &sop->so_replay;
2647 rp->rp_status = NFSERR_SERVERFAULT;
2648 rp->rp_buflen = 0;
2649 rp->rp_buf = rp->rp_ibuf;
2650 return sop;
2651}
2652
NeilBrownfd39ca92005-06-23 22:04:03 -07002653static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2655{
2656 struct nfs4_stateid *stp;
2657 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2658
NeilBrown5ac049a2005-06-23 22:03:03 -07002659 stp = nfs4_alloc_stateid();
2660 if (stp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 goto out;
2662 INIT_LIST_HEAD(&stp->st_hash);
2663 INIT_LIST_HEAD(&stp->st_perfile);
NeilBrownea1da632005-06-23 22:04:17 -07002664 INIT_LIST_HEAD(&stp->st_perstateowner);
2665 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
NeilBrown8beefa22005-06-23 22:03:08 -07002667 list_add(&stp->st_perfile, &fp->fi_stateids);
NeilBrownea1da632005-06-23 22:04:17 -07002668 list_add(&stp->st_perstateowner, &sop->so_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002669 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07002670 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 stp->st_file = fp;
2672 stp->st_stateid.si_boot = boot_time;
2673 stp->st_stateid.si_stateownerid = sop->so_id;
2674 stp->st_stateid.si_fileid = fp->fi_id;
2675 stp->st_stateid.si_generation = 0;
2676 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2677 stp->st_access_bmap = open_stp->st_access_bmap;
2678 stp->st_deny_bmap = open_stp->st_deny_bmap;
2679
2680out:
2681 return stp;
2682}
2683
NeilBrownfd39ca92005-06-23 22:04:03 -07002684static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685check_lock_length(u64 offset, u64 length)
2686{
2687 return ((length == 0) || ((length != ~(u64)0) &&
2688 LOFF_OVERFLOW(offset, length)));
2689}
2690
2691/*
2692 * LOCK operation
2693 */
2694int
2695nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2696{
NeilBrown3e9e3db2005-06-23 22:04:20 -07002697 struct nfs4_stateowner *open_sop = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698 struct nfs4_stateid *lock_stp;
2699 struct file *filp;
2700 struct file_lock file_lock;
2701 struct file_lock *conflock;
2702 int status = 0;
2703 unsigned int strhashval;
2704
2705 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2706 (long long) lock->lk_offset,
2707 (long long) lock->lk_length);
2708
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 if (check_lock_length(lock->lk_offset, lock->lk_length))
2710 return nfserr_inval;
2711
2712 nfs4_lock_state();
2713
2714 if (lock->lk_is_new) {
2715 /*
2716 * Client indicates that this is a new lockowner.
2717 * Use open owner and open stateid to create lock owner and lock
2718 * stateid.
2719 */
2720 struct nfs4_stateid *open_stp = NULL;
2721 struct nfs4_file *fp;
2722
2723 status = nfserr_stale_clientid;
2724 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2725 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2726 goto out;
2727 }
2728
2729 /* is the new lock seqid presented by the client zero? */
2730 status = nfserr_bad_seqid;
2731 if (lock->v.new.lock_seqid != 0)
2732 goto out;
2733
2734 /* validate and update open stateid and open seqid */
2735 status = nfs4_preprocess_seqid_op(current_fh,
2736 lock->lk_new_open_seqid,
2737 &lock->lk_new_open_stateid,
2738 CHECK_FH | OPEN_STATE,
2739 &open_sop, &open_stp,
2740 &lock->v.new.clientid);
2741 if (status) {
2742 if (lock->lk_reclaim)
2743 status = nfserr_reclaim_bad;
2744 goto out;
2745 }
2746 /* create lockowner and lock stateid */
2747 fp = open_stp->st_file;
2748 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2749 open_sop->so_client->cl_clientid.cl_id,
2750 &lock->v.new.owner);
NeilBrown3e9e3db2005-06-23 22:04:20 -07002751 /* XXX: Do we need to check for duplicate stateowners on
2752 * the same file, or should they just be allowed (and
2753 * create new stateids)? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002754 status = nfserr_resource;
2755 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2756 goto out;
2757 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2758 fp, open_stp)) == NULL) {
2759 release_stateowner(lock->lk_stateowner);
2760 lock->lk_stateowner = NULL;
2761 goto out;
2762 }
2763 /* bump the open seqid used to create the lock */
2764 open_sop->so_seqid++;
2765 } else {
2766 /* lock (lock owner + lock stateid) already exists */
2767 status = nfs4_preprocess_seqid_op(current_fh,
2768 lock->lk_old_lock_seqid,
2769 &lock->lk_old_lock_stateid,
2770 CHECK_FH | LOCK_STATE,
2771 &lock->lk_stateowner, &lock_stp, NULL);
2772 if (status)
2773 goto out;
2774 }
2775 /* lock->lk_stateowner and lock_stp have been created or found */
2776 filp = lock_stp->st_vfs_file;
2777
2778 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2779 printk("NFSD: nfsd4_lock: permission denied!\n");
2780 goto out;
2781 }
2782
NeilBrown0dd395d2005-07-07 17:59:15 -07002783 status = nfserr_grace;
2784 if (nfs4_in_grace() && !lock->lk_reclaim)
2785 goto out;
2786 status = nfserr_no_grace;
2787 if (!nfs4_in_grace() && lock->lk_reclaim)
2788 goto out;
2789
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790 locks_init_lock(&file_lock);
2791 switch (lock->lk_type) {
2792 case NFS4_READ_LT:
2793 case NFS4_READW_LT:
2794 file_lock.fl_type = F_RDLCK;
2795 break;
2796 case NFS4_WRITE_LT:
2797 case NFS4_WRITEW_LT:
2798 file_lock.fl_type = F_WRLCK;
2799 break;
2800 default:
2801 status = nfserr_inval;
2802 goto out;
2803 }
2804 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2805 file_lock.fl_pid = current->tgid;
2806 file_lock.fl_file = filp;
2807 file_lock.fl_flags = FL_POSIX;
2808
2809 file_lock.fl_start = lock->lk_offset;
2810 if ((lock->lk_length == ~(u64)0) ||
2811 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2812 file_lock.fl_end = ~(u64)0;
2813 else
2814 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2815 nfs4_transform_lock_offset(&file_lock);
2816
2817 /*
2818 * Try to lock the file in the VFS.
2819 * Note: locks.c uses the BKL to protect the inode's lock list.
2820 */
2821
2822 status = posix_lock_file(filp, &file_lock);
2823 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2824 file_lock.fl_ops->fl_release_private(&file_lock);
2825 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2826 switch (-status) {
2827 case 0: /* success! */
2828 update_stateid(&lock_stp->st_stateid);
2829 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2830 sizeof(stateid_t));
2831 goto out;
2832 case (EAGAIN):
2833 goto conflicting_lock;
2834 case (EDEADLK):
2835 status = nfserr_deadlock;
2836 default:
2837 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2838 goto out_destroy_new_stateid;
2839 }
2840
2841conflicting_lock:
2842 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2843 status = nfserr_denied;
2844 /* XXX There is a race here. Future patch needed to provide
2845 * an atomic posix_lock_and_test_file
2846 */
2847 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2848 status = nfserr_serverfault;
2849 goto out;
2850 }
2851 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2852
2853out_destroy_new_stateid:
2854 if (lock->lk_is_new) {
2855 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2856 /*
2857 * An error encountered after instantiation of the new
2858 * stateid has forced us to destroy it.
2859 */
2860 if (!seqid_mutating_err(status))
2861 open_sop->so_seqid--;
2862
2863 release_state_owner(lock_stp, LOCK_STATE);
2864 }
2865out:
2866 if (lock->lk_stateowner)
2867 nfs4_get_stateowner(lock->lk_stateowner);
2868 nfs4_unlock_state();
2869 return status;
2870}
2871
2872/*
2873 * LOCKT operation
2874 */
2875int
2876nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2877{
2878 struct inode *inode;
2879 struct file file;
2880 struct file_lock file_lock;
2881 struct file_lock *conflicting_lock;
2882 int status;
2883
2884 if (nfs4_in_grace())
2885 return nfserr_grace;
2886
2887 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2888 return nfserr_inval;
2889
2890 lockt->lt_stateowner = NULL;
2891 nfs4_lock_state();
2892
2893 status = nfserr_stale_clientid;
2894 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2895 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2896 goto out;
2897 }
2898
2899 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2900 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2901 if (status == nfserr_symlink)
2902 status = nfserr_inval;
2903 goto out;
2904 }
2905
2906 inode = current_fh->fh_dentry->d_inode;
2907 locks_init_lock(&file_lock);
2908 switch (lockt->lt_type) {
2909 case NFS4_READ_LT:
2910 case NFS4_READW_LT:
2911 file_lock.fl_type = F_RDLCK;
2912 break;
2913 case NFS4_WRITE_LT:
2914 case NFS4_WRITEW_LT:
2915 file_lock.fl_type = F_WRLCK;
2916 break;
2917 default:
2918 printk("NFSD: nfs4_lockt: bad lock type!\n");
2919 status = nfserr_inval;
2920 goto out;
2921 }
2922
2923 lockt->lt_stateowner = find_lockstateowner_str(inode,
2924 &lockt->lt_clientid, &lockt->lt_owner);
2925 if (lockt->lt_stateowner)
2926 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2927 file_lock.fl_pid = current->tgid;
2928 file_lock.fl_flags = FL_POSIX;
2929
2930 file_lock.fl_start = lockt->lt_offset;
2931 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2932 file_lock.fl_end = ~(u64)0;
2933 else
2934 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2935
2936 nfs4_transform_lock_offset(&file_lock);
2937
2938 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2939 * since LOCKT doesn't require an OPEN, and therefore a struct
2940 * file may not exist, pass posix_test_lock a struct file with
2941 * only the dentry:inode set.
2942 */
2943 memset(&file, 0, sizeof (struct file));
2944 file.f_dentry = current_fh->fh_dentry;
2945
2946 status = nfs_ok;
2947 conflicting_lock = posix_test_lock(&file, &file_lock);
2948 if (conflicting_lock) {
2949 status = nfserr_denied;
2950 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2951 }
2952out:
2953 nfs4_unlock_state();
2954 return status;
2955}
2956
2957int
2958nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2959{
2960 struct nfs4_stateid *stp;
2961 struct file *filp = NULL;
2962 struct file_lock file_lock;
2963 int status;
2964
2965 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2966 (long long) locku->lu_offset,
2967 (long long) locku->lu_length);
2968
2969 if (check_lock_length(locku->lu_offset, locku->lu_length))
2970 return nfserr_inval;
2971
2972 nfs4_lock_state();
2973
2974 if ((status = nfs4_preprocess_seqid_op(current_fh,
2975 locku->lu_seqid,
2976 &locku->lu_stateid,
2977 CHECK_FH | LOCK_STATE,
2978 &locku->lu_stateowner, &stp, NULL)))
2979 goto out;
2980
2981 filp = stp->st_vfs_file;
2982 BUG_ON(!filp);
2983 locks_init_lock(&file_lock);
2984 file_lock.fl_type = F_UNLCK;
2985 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2986 file_lock.fl_pid = current->tgid;
2987 file_lock.fl_file = filp;
2988 file_lock.fl_flags = FL_POSIX;
2989 file_lock.fl_start = locku->lu_offset;
2990
2991 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2992 file_lock.fl_end = ~(u64)0;
2993 else
2994 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2995 nfs4_transform_lock_offset(&file_lock);
2996
2997 /*
2998 * Try to unlock the file in the VFS.
2999 */
3000 status = posix_lock_file(filp, &file_lock);
3001 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3002 file_lock.fl_ops->fl_release_private(&file_lock);
3003 if (status) {
3004 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3005 goto out_nfserr;
3006 }
3007 /*
3008 * OK, unlock succeeded; the only thing left to do is update the stateid.
3009 */
3010 update_stateid(&stp->st_stateid);
3011 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3012
3013out:
3014 if (locku->lu_stateowner)
3015 nfs4_get_stateowner(locku->lu_stateowner);
3016 nfs4_unlock_state();
3017 return status;
3018
3019out_nfserr:
3020 status = nfserrno(status);
3021 goto out;
3022}
3023
3024/*
3025 * returns
3026 * 1: locks held by lockowner
3027 * 0: no locks held by lockowner
3028 */
3029static int
3030check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3031{
3032 struct file_lock **flpp;
3033 struct inode *inode = filp->f_dentry->d_inode;
3034 int status = 0;
3035
3036 lock_kernel();
3037 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3038 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3039 status = 1;
3040 goto out;
3041 }
3042out:
3043 unlock_kernel();
3044 return status;
3045}
3046
3047int
3048nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3049{
3050 clientid_t *clid = &rlockowner->rl_clientid;
NeilBrown3e9e3db2005-06-23 22:04:20 -07003051 struct nfs4_stateowner *sop;
3052 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 struct xdr_netobj *owner = &rlockowner->rl_owner;
NeilBrown3e9e3db2005-06-23 22:04:20 -07003054 struct list_head matches;
3055 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003056 int status;
3057
3058 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3059 clid->cl_boot, clid->cl_id);
3060
3061 /* XXX check for lease expiration */
3062
3063 status = nfserr_stale_clientid;
3064 if (STALE_CLIENTID(clid)) {
3065 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3066 return status;
3067 }
3068
3069 nfs4_lock_state();
3070
NeilBrown3e9e3db2005-06-23 22:04:20 -07003071 status = nfserr_locks_held;
3072 /* XXX: we're doing a linear search through all the lockowners.
3073 * Yipes! For now we'll just hope clients aren't really using
3074 * release_lockowner much, but eventually we have to fix these
3075 * data structures. */
3076 INIT_LIST_HEAD(&matches);
3077 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3078 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3079 if (!cmp_owner_str(sop, owner, clid))
3080 continue;
3081 list_for_each_entry(stp, &sop->so_stateids,
3082 st_perstateowner) {
3083 if (check_for_locks(stp->st_vfs_file, sop))
3084 goto out;
3085 /* Note: so_perclient unused for lockowners,
3086 * so it's OK to fool with here. */
3087 list_add(&sop->so_perclient, &matches);
3088 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003089 }
NeilBrown3e9e3db2005-06-23 22:04:20 -07003090 }
3091 /* Clients probably won't expect us to return with some (but not all)
3092 * of the lockowner state released; so don't release any until all
3093 * have been checked. */
3094 status = nfs_ok;
NeilBrown0fa822e2005-07-07 17:59:14 -07003095 while (!list_empty(&matches)) {
3096 sop = list_entry(matches.next, struct nfs4_stateowner,
3097 so_perclient);
3098 /* unhash_stateowner deletes so_perclient only
3099 * for openowners. */
3100 list_del(&sop->so_perclient);
NeilBrown3e9e3db2005-06-23 22:04:20 -07003101 release_stateowner(sop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003102 }
3103out:
3104 nfs4_unlock_state();
3105 return status;
3106}
3107
3108static inline struct nfs4_client_reclaim *
NeilBrowna55370a2005-06-23 22:03:52 -07003109alloc_reclaim(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003110{
NeilBrowna55370a2005-06-23 22:03:52 -07003111 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003112}
3113
NeilBrownc7b9a452005-06-23 22:04:30 -07003114int
3115nfs4_has_reclaimed_state(const char *name)
3116{
3117 unsigned int strhashval = clientstr_hashval(name);
3118 struct nfs4_client *clp;
3119
3120 clp = find_confirmed_client_by_str(name, strhashval);
3121 return clp ? 1 : 0;
3122}
3123
Linus Torvalds1da177e2005-04-16 15:20:36 -07003124/*
3125 * failure => all reset bets are off, nfserr_no_grace...
3126 */
NeilBrown190e4fb2005-06-23 22:04:25 -07003127int
3128nfs4_client_to_reclaim(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003129{
3130 unsigned int strhashval;
3131 struct nfs4_client_reclaim *crp = NULL;
3132
NeilBrowna55370a2005-06-23 22:03:52 -07003133 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3134 crp = alloc_reclaim();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003135 if (!crp)
3136 return 0;
NeilBrowna55370a2005-06-23 22:03:52 -07003137 strhashval = clientstr_hashval(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003138 INIT_LIST_HEAD(&crp->cr_strhash);
3139 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
NeilBrowna55370a2005-06-23 22:03:52 -07003140 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003141 reclaim_str_hashtbl_size++;
3142 return 1;
3143}
3144
3145static void
3146nfs4_release_reclaim(void)
3147{
3148 struct nfs4_client_reclaim *crp = NULL;
3149 int i;
3150
Linus Torvalds1da177e2005-04-16 15:20:36 -07003151 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3152 while (!list_empty(&reclaim_str_hashtbl[i])) {
3153 crp = list_entry(reclaim_str_hashtbl[i].next,
3154 struct nfs4_client_reclaim, cr_strhash);
3155 list_del(&crp->cr_strhash);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003156 kfree(crp);
3157 reclaim_str_hashtbl_size--;
3158 }
3159 }
3160 BUG_ON(reclaim_str_hashtbl_size);
3161}
3162
3163/*
3164 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
NeilBrownfd39ca92005-06-23 22:04:03 -07003165static struct nfs4_client_reclaim *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003166nfs4_find_reclaim_client(clientid_t *clid)
3167{
3168 unsigned int strhashval;
3169 struct nfs4_client *clp;
3170 struct nfs4_client_reclaim *crp = NULL;
3171
3172
3173 /* find clientid in conf_id_hashtbl */
3174 clp = find_confirmed_client(clid);
3175 if (clp == NULL)
3176 return NULL;
3177
NeilBrowna55370a2005-06-23 22:03:52 -07003178 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3179 clp->cl_name.len, clp->cl_name.data,
3180 clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003181
3182 /* find clp->cl_name in reclaim_str_hashtbl */
NeilBrowna55370a2005-06-23 22:03:52 -07003183 strhashval = clientstr_hashval(clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
NeilBrowna55370a2005-06-23 22:03:52 -07003185 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003186 return crp;
3187 }
3188 }
3189 return NULL;
3190}
3191
3192/*
3193* Called from OPEN. Look for clientid in reclaim list.
3194*/
3195int
3196nfs4_check_open_reclaim(clientid_t *clid)
3197{
NeilBrowndfc83562005-06-23 22:03:16 -07003198 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003199}
3200
NeilBrownac4d8ff2005-06-23 22:03:30 -07003201/* initialization to perform at module load time: */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003202
NeilBrownac4d8ff2005-06-23 22:03:30 -07003203void
3204nfs4_state_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003205{
3206 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003207
Linus Torvalds1da177e2005-04-16 15:20:36 -07003208 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3209 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3210 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3211 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3212 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3213 }
3214 for (i = 0; i < FILE_HASH_SIZE; i++) {
3215 INIT_LIST_HEAD(&file_hashtbl[i]);
3216 }
3217 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3218 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3219 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3220 }
3221 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3222 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3223 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3224 }
3225 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3226 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3227 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3228 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003229 memset(&onestateid, ~0, sizeof(stateid_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230 INIT_LIST_HEAD(&close_lru);
3231 INIT_LIST_HEAD(&client_lru);
3232 INIT_LIST_HEAD(&del_recall_lru);
NeilBrownac4d8ff2005-06-23 22:03:30 -07003233 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3234 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3235 reclaim_str_hashtbl_size = 0;
NeilBrownac4d8ff2005-06-23 22:03:30 -07003236}
3237
NeilBrown190e4fb2005-06-23 22:04:25 -07003238static void
3239nfsd4_load_reboot_recovery_data(void)
3240{
3241 int status;
3242
NeilBrown0964a3d2005-06-23 22:04:32 -07003243 nfs4_lock_state();
3244 nfsd4_init_recdir(user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -07003245 status = nfsd4_recdir_load();
NeilBrown0964a3d2005-06-23 22:04:32 -07003246 nfs4_unlock_state();
NeilBrown190e4fb2005-06-23 22:04:25 -07003247 if (status)
3248 printk("NFSD: Failure reading reboot recovery data\n");
3249}
3250
NeilBrownac4d8ff2005-06-23 22:03:30 -07003251/* initialization to perform when the nfsd service is started: */
3252
3253static void
3254__nfs4_state_start(void)
3255{
3256 time_t grace_time;
3257
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258 boot_time = get_seconds();
NeilBrownd99a05a2005-06-23 22:03:21 -07003259 grace_time = max(user_lease_time, lease_time);
3260 lease_time = user_lease_time;
NeilBrowna76b4312005-06-23 22:04:01 -07003261 in_grace = 1;
NeilBrownd99a05a2005-06-23 22:03:21 -07003262 printk("NFSD: starting %ld-second grace period\n", grace_time);
NeilBrown58da2822005-06-23 22:03:19 -07003263 laundry_wq = create_singlethread_workqueue("nfsd4");
NeilBrowna76b4312005-06-23 22:04:01 -07003264 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003265}
3266
3267int
NeilBrown76a35502005-06-23 22:03:26 -07003268nfs4_state_start(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003269{
3270 int status;
3271
3272 if (nfs4_init)
3273 return 0;
3274 status = nfsd4_init_slabs();
3275 if (status)
3276 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -07003277 nfsd4_load_reboot_recovery_data();
NeilBrown76a35502005-06-23 22:03:26 -07003278 __nfs4_state_start();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003279 nfs4_init = 1;
3280 return 0;
3281}
3282
3283int
3284nfs4_in_grace(void)
3285{
NeilBrowna76b4312005-06-23 22:04:01 -07003286 return in_grace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287}
3288
3289time_t
3290nfs4_lease_time(void)
3291{
3292 return lease_time;
3293}
3294
3295static void
3296__nfs4_state_shutdown(void)
3297{
3298 int i;
3299 struct nfs4_client *clp = NULL;
3300 struct nfs4_delegation *dp = NULL;
3301 struct nfs4_stateowner *sop = NULL;
3302 struct list_head *pos, *next, reaplist;
3303
3304 list_for_each_safe(pos, next, &close_lru) {
3305 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3306 list_del(&sop->so_close_lru);
3307 nfs4_put_stateowner(sop);
3308 }
3309
3310 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3311 while (!list_empty(&conf_id_hashtbl[i])) {
3312 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3313 expire_client(clp);
3314 }
3315 while (!list_empty(&unconf_str_hashtbl[i])) {
3316 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3317 expire_client(clp);
3318 }
3319 }
3320 INIT_LIST_HEAD(&reaplist);
3321 spin_lock(&recall_lock);
3322 list_for_each_safe(pos, next, &del_recall_lru) {
3323 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3324 list_move(&dp->dl_recall_lru, &reaplist);
3325 }
3326 spin_unlock(&recall_lock);
3327 list_for_each_safe(pos, next, &reaplist) {
3328 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3329 list_del_init(&dp->dl_recall_lru);
3330 unhash_delegation(dp);
3331 }
3332
Linus Torvalds1da177e2005-04-16 15:20:36 -07003333 cancel_delayed_work(&laundromat_work);
NeilBrown58da2822005-06-23 22:03:19 -07003334 flush_workqueue(laundry_wq);
3335 destroy_workqueue(laundry_wq);
NeilBrown190e4fb2005-06-23 22:04:25 -07003336 nfsd4_shutdown_recdir();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003337 nfs4_init = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003338}
3339
3340void
3341nfs4_state_shutdown(void)
3342{
3343 nfs4_lock_state();
3344 nfs4_release_reclaim();
3345 __nfs4_state_shutdown();
3346 nfsd4_free_slabs();
3347 nfs4_unlock_state();
3348}
3349
NeilBrown0964a3d2005-06-23 22:04:32 -07003350static void
3351nfs4_set_recdir(char *recdir)
3352{
3353 nfs4_lock_state();
3354 strcpy(user_recovery_dirname, recdir);
3355 nfs4_unlock_state();
3356}
3357
3358/*
3359 * Change the NFSv4 recovery directory to recdir.
3360 */
3361int
3362nfs4_reset_recoverydir(char *recdir)
3363{
3364 int status;
3365 struct nameidata nd;
3366
3367 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3368 if (status)
3369 return status;
3370 status = -ENOTDIR;
3371 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3372 nfs4_set_recdir(recdir);
3373 status = 0;
3374 }
3375 path_release(&nd);
3376 return status;
3377}
3378
Linus Torvalds1da177e2005-04-16 15:20:36 -07003379/*
3380 * Called when leasetime is changed.
3381 *
NeilBrownd99a05a2005-06-23 22:03:21 -07003382 * The only way the protocol gives us to handle on-the-fly lease changes is to
3383 * simulate a reboot. Instead of doing that, we just wait till the next time
3384 * we start to register any changes in lease time. If the administrator
3385 * really wants to change the lease time *now*, they can go ahead and bring
3386 * nfsd down and then back up again after changing the lease time.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003387 */
3388void
3389nfs4_reset_lease(time_t leasetime)
3390{
NeilBrownd99a05a2005-06-23 22:03:21 -07003391 lock_kernel();
3392 user_lease_time = leasetime;
3393 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003394}