blob: b96714ae3dd79412f670c2a76b339b8bb5b930b4 [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 */
NeilBrownbd9aac52005-07-07 17:59:19 -07001486 if (open->op_seqid == sop->so_seqid - 1){
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 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) {
NeilBrownbd9aac52005-07-07 17:59:19 -07001501 if (open->op_seqid == sop->so_seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 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:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 return status;
1535}
1536
NeilBrown4a6e43e2005-06-23 22:02:50 -07001537static inline int
1538nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1539{
1540 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1541 return nfserr_openmode;
1542 else
1543 return nfs_ok;
1544}
1545
NeilBrown52f4fb42005-06-23 22:02:49 -07001546static struct nfs4_delegation *
1547find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1548{
1549 struct nfs4_delegation *dp;
1550
NeilBrownea1da632005-06-23 22:04:17 -07001551 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
NeilBrown52f4fb42005-06-23 22:02:49 -07001552 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1553 return dp;
1554 }
1555 return NULL;
1556}
1557
NeilBrownc44c5ee2005-06-23 22:02:54 -07001558static int
NeilBrown567d9822005-06-23 22:02:53 -07001559nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1560 struct nfs4_delegation **dp)
1561{
1562 int flags;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001563 int status = nfserr_bad_stateid;
NeilBrown567d9822005-06-23 22:02:53 -07001564
1565 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1566 if (*dp == NULL)
NeilBrownc44c5ee2005-06-23 22:02:54 -07001567 goto out;
NeilBrown567d9822005-06-23 22:02:53 -07001568 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1569 RD_STATE : WR_STATE;
1570 status = nfs4_check_delegmode(*dp, flags);
1571 if (status)
1572 *dp = NULL;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001573out:
1574 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1575 return nfs_ok;
1576 if (status)
1577 return status;
1578 open->op_stateowner->so_confirmed = 1;
1579 return nfs_ok;
NeilBrown567d9822005-06-23 22:02:53 -07001580}
1581
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582static int
1583nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1584{
1585 struct nfs4_stateid *local;
1586 int status = nfserr_share_denied;
1587 struct nfs4_stateowner *sop = open->op_stateowner;
1588
NeilBrown8beefa22005-06-23 22:03:08 -07001589 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 /* ignore lock owners */
1591 if (local->st_stateowner->so_is_open_owner == 0)
1592 continue;
1593 /* remember if we have seen this open owner */
1594 if (local->st_stateowner == sop)
1595 *stpp = local;
1596 /* check for conflicting share reservations */
1597 if (!test_share(local, open))
1598 goto out;
1599 }
1600 status = 0;
1601out:
1602 return status;
1603}
1604
NeilBrown5ac049a2005-06-23 22:03:03 -07001605static inline struct nfs4_stateid *
1606nfs4_alloc_stateid(void)
1607{
1608 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1609}
1610
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611static int
1612nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
NeilBrown567d9822005-06-23 22:02:53 -07001613 struct nfs4_delegation *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 struct svc_fh *cur_fh, int flags)
1615{
1616 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617
NeilBrown5ac049a2005-06-23 22:03:03 -07001618 stp = nfs4_alloc_stateid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 if (stp == NULL)
1620 return nfserr_resource;
1621
NeilBrown567d9822005-06-23 22:02:53 -07001622 if (dp) {
1623 get_file(dp->dl_vfs_file);
1624 stp->st_vfs_file = dp->dl_vfs_file;
1625 } else {
1626 int status;
1627 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1628 &stp->st_vfs_file);
1629 if (status) {
1630 if (status == nfserr_dropit)
1631 status = nfserr_jukebox;
NeilBrown5ac049a2005-06-23 22:03:03 -07001632 kmem_cache_free(stateid_slab, stp);
NeilBrown567d9822005-06-23 22:02:53 -07001633 return status;
1634 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 *stpp = stp;
1637 return 0;
1638}
1639
1640static inline int
1641nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1642 struct nfsd4_open *open)
1643{
1644 struct iattr iattr = {
1645 .ia_valid = ATTR_SIZE,
1646 .ia_size = 0,
1647 };
1648 if (!open->op_truncate)
1649 return 0;
1650 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1651 return -EINVAL;
1652 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1653}
1654
1655static int
1656nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1657{
1658 struct file *filp = stp->st_vfs_file;
1659 struct inode *inode = filp->f_dentry->d_inode;
1660 unsigned int share_access;
1661 int status;
1662
1663 set_access(&share_access, stp->st_access_bmap);
1664 share_access = ~share_access;
1665 share_access &= open->op_share_access;
1666
1667 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1668 return nfsd4_truncate(rqstp, cur_fh, open);
1669
1670 status = get_write_access(inode);
1671 if (status)
1672 return nfserrno(status);
1673 status = nfsd4_truncate(rqstp, cur_fh, open);
1674 if (status) {
1675 put_write_access(inode);
1676 return status;
1677 }
1678 /* remember the open */
1679 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1680 set_bit(open->op_share_access, &stp->st_access_bmap);
1681 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1682
1683 return nfs_ok;
1684}
1685
1686
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687static void
NeilBrown37515172005-07-07 17:59:16 -07001688nfs4_set_claim_prev(struct nfsd4_open *open)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689{
NeilBrown37515172005-07-07 17:59:16 -07001690 open->op_stateowner->so_confirmed = 1;
1691 open->op_stateowner->so_client->cl_firststate = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692}
1693
1694/*
1695 * Attempt to hand out a delegation.
1696 */
1697static void
1698nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1699{
1700 struct nfs4_delegation *dp;
1701 struct nfs4_stateowner *sop = stp->st_stateowner;
1702 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1703 struct file_lock fl, *flp = &fl;
1704 int status, flag = 0;
1705
1706 flag = NFS4_OPEN_DELEGATE_NONE;
NeilBrown7b190fe2005-06-23 22:03:23 -07001707 open->op_recall = 0;
1708 switch (open->op_claim_type) {
1709 case NFS4_OPEN_CLAIM_PREVIOUS:
1710 if (!atomic_read(&cb->cb_set))
1711 open->op_recall = 1;
1712 flag = open->op_delegate_type;
1713 if (flag == NFS4_OPEN_DELEGATE_NONE)
1714 goto out;
1715 break;
1716 case NFS4_OPEN_CLAIM_NULL:
1717 /* Let's not give out any delegations till everyone's
1718 * had the chance to reclaim theirs.... */
1719 if (nfs4_in_grace())
1720 goto out;
1721 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1722 goto out;
1723 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1724 flag = NFS4_OPEN_DELEGATE_WRITE;
1725 else
1726 flag = NFS4_OPEN_DELEGATE_READ;
1727 break;
1728 default:
1729 goto out;
1730 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
1732 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1733 if (dp == NULL) {
1734 flag = NFS4_OPEN_DELEGATE_NONE;
1735 goto out;
1736 }
1737 locks_init_lock(&fl);
1738 fl.fl_lmops = &nfsd_lease_mng_ops;
1739 fl.fl_flags = FL_LEASE;
1740 fl.fl_end = OFFSET_MAX;
1741 fl.fl_owner = (fl_owner_t)dp;
1742 fl.fl_file = stp->st_vfs_file;
1743 fl.fl_pid = current->tgid;
1744
1745 /* setlease checks to see if delegation should be handed out.
1746 * the lock_manager callbacks fl_mylease and fl_change are used
1747 */
1748 if ((status = setlease(stp->st_vfs_file,
1749 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1750 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
NeilBrownc9071322005-04-16 15:26:38 -07001751 unhash_delegation(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 flag = NFS4_OPEN_DELEGATE_NONE;
1753 goto out;
1754 }
1755
1756 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1757
1758 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1759 dp->dl_stateid.si_boot,
1760 dp->dl_stateid.si_stateownerid,
1761 dp->dl_stateid.si_fileid,
1762 dp->dl_stateid.si_generation);
1763out:
NeilBrown7b190fe2005-06-23 22:03:23 -07001764 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1765 && flag == NFS4_OPEN_DELEGATE_NONE
1766 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1767 printk("NFSD: WARNING: refusing delegation reclaim\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 open->op_delegate_type = flag;
1769}
1770
1771/*
1772 * called with nfs4_lock_state() held.
1773 */
1774int
1775nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1776{
1777 struct nfs4_file *fp = NULL;
1778 struct inode *ino = current_fh->fh_dentry->d_inode;
1779 struct nfs4_stateid *stp = NULL;
NeilBrown567d9822005-06-23 22:02:53 -07001780 struct nfs4_delegation *dp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 int status;
1782
NeilBrownb6483302005-07-07 17:59:15 -07001783 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1784 return nfserr_grace;
1785
1786 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1787 return nfserr_no_grace;
1788
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 status = nfserr_inval;
1790 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1791 goto out;
1792 /*
1793 * Lookup file; if found, lookup stateid and check open request,
1794 * and check for delegations in the process of being recalled.
1795 * If not found, create the nfs4_file struct
1796 */
1797 fp = find_file(ino);
1798 if (fp) {
1799 if ((status = nfs4_check_open(fp, open, &stp)))
1800 goto out;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001801 status = nfs4_check_deleg(fp, open, &dp);
1802 if (status)
1803 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 } else {
NeilBrownc44c5ee2005-06-23 22:02:54 -07001805 status = nfserr_bad_stateid;
1806 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1807 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 status = nfserr_resource;
1809 fp = alloc_init_file(ino);
1810 if (fp == NULL)
1811 goto out;
1812 }
1813
1814 /*
1815 * OPEN the file, or upgrade an existing OPEN.
1816 * If truncate fails, the OPEN fails.
1817 */
1818 if (stp) {
1819 /* Stateid was found, this is an OPEN upgrade */
1820 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1821 if (status)
1822 goto out;
NeilBrown444c2c02005-07-07 17:59:22 -07001823 update_stateid(&stp->st_stateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 } else {
1825 /* Stateid was not found, this is a new OPEN */
1826 int flags = 0;
1827 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1828 flags = MAY_WRITE;
1829 else
1830 flags = MAY_READ;
NeilBrown567d9822005-06-23 22:02:53 -07001831 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1832 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 goto out;
1834 init_stateid(stp, fp, open);
1835 status = nfsd4_truncate(rqstp, current_fh, open);
1836 if (status) {
1837 release_stateid(stp, OPEN_STATE);
1838 goto out;
1839 }
1840 }
1841 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1842
1843 /*
1844 * Attempt to hand out a delegation. No error return, because the
1845 * OPEN succeeds even if we fail.
1846 */
1847 nfs4_open_delegation(current_fh, open, stp);
1848
1849 status = nfs_ok;
1850
1851 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1852 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1853 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1854out:
NeilBrown13cd2182005-06-23 22:03:10 -07001855 if (fp)
1856 put_nfs4_file(fp);
NeilBrown37515172005-07-07 17:59:16 -07001857 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1858 nfs4_set_claim_prev(open);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 /*
1860 * To finish the open response, we just need to set the rflags.
1861 */
1862 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1863 if (!open->op_stateowner->so_confirmed)
1864 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1865
1866 return status;
1867}
1868
NeilBrown58da2822005-06-23 22:03:19 -07001869static struct workqueue_struct *laundry_wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870static struct work_struct laundromat_work;
1871static void laundromat_main(void *);
1872static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1873
1874int
1875nfsd4_renew(clientid_t *clid)
1876{
1877 struct nfs4_client *clp;
1878 int status;
1879
1880 nfs4_lock_state();
1881 dprintk("process_renew(%08x/%08x): starting\n",
1882 clid->cl_boot, clid->cl_id);
1883 status = nfserr_stale_clientid;
1884 if (STALE_CLIENTID(clid))
1885 goto out;
1886 clp = find_confirmed_client(clid);
1887 status = nfserr_expired;
1888 if (clp == NULL) {
1889 /* We assume the client took too long to RENEW. */
1890 dprintk("nfsd4_renew: clientid not found!\n");
1891 goto out;
1892 }
1893 renew_client(clp);
1894 status = nfserr_cb_path_down;
NeilBrownea1da632005-06-23 22:04:17 -07001895 if (!list_empty(&clp->cl_delegations)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 && !atomic_read(&clp->cl_callback.cb_set))
1897 goto out;
1898 status = nfs_ok;
1899out:
1900 nfs4_unlock_state();
1901 return status;
1902}
1903
NeilBrowna76b4312005-06-23 22:04:01 -07001904static void
1905end_grace(void)
1906{
1907 dprintk("NFSD: end of grace period\n");
NeilBrownc7b9a452005-06-23 22:04:30 -07001908 nfsd4_recdir_purge_old();
NeilBrowna76b4312005-06-23 22:04:01 -07001909 in_grace = 0;
1910}
1911
NeilBrownfd39ca92005-06-23 22:04:03 -07001912static time_t
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913nfs4_laundromat(void)
1914{
1915 struct nfs4_client *clp;
1916 struct nfs4_stateowner *sop;
1917 struct nfs4_delegation *dp;
1918 struct list_head *pos, *next, reaplist;
1919 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1920 time_t t, clientid_val = NFSD_LEASE_TIME;
1921 time_t u, test_val = NFSD_LEASE_TIME;
1922
1923 nfs4_lock_state();
1924
1925 dprintk("NFSD: laundromat service - starting\n");
NeilBrowna76b4312005-06-23 22:04:01 -07001926 if (in_grace)
1927 end_grace();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 list_for_each_safe(pos, next, &client_lru) {
1929 clp = list_entry(pos, struct nfs4_client, cl_lru);
1930 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1931 t = clp->cl_time - cutoff;
1932 if (clientid_val > t)
1933 clientid_val = t;
1934 break;
1935 }
1936 dprintk("NFSD: purging unused client (clientid %08x)\n",
1937 clp->cl_clientid.cl_id);
NeilBrownc7b9a452005-06-23 22:04:30 -07001938 nfsd4_remove_clid_dir(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 expire_client(clp);
1940 }
1941 INIT_LIST_HEAD(&reaplist);
1942 spin_lock(&recall_lock);
1943 list_for_each_safe(pos, next, &del_recall_lru) {
1944 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1945 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1946 u = dp->dl_time - cutoff;
1947 if (test_val > u)
1948 test_val = u;
1949 break;
1950 }
1951 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1952 dp, dp->dl_flock);
1953 list_move(&dp->dl_recall_lru, &reaplist);
1954 }
1955 spin_unlock(&recall_lock);
1956 list_for_each_safe(pos, next, &reaplist) {
1957 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1958 list_del_init(&dp->dl_recall_lru);
1959 unhash_delegation(dp);
1960 }
1961 test_val = NFSD_LEASE_TIME;
1962 list_for_each_safe(pos, next, &close_lru) {
1963 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1964 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1965 u = sop->so_time - cutoff;
1966 if (test_val > u)
1967 test_val = u;
1968 break;
1969 }
1970 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1971 sop->so_id);
1972 list_del(&sop->so_close_lru);
1973 nfs4_put_stateowner(sop);
1974 }
1975 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1976 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1977 nfs4_unlock_state();
1978 return clientid_val;
1979}
1980
1981void
1982laundromat_main(void *not_used)
1983{
1984 time_t t;
1985
1986 t = nfs4_laundromat();
1987 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
NeilBrown58da2822005-06-23 22:03:19 -07001988 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989}
1990
1991/* search ownerid_hashtbl[] and close_lru for stateid owner
1992 * (stateid->si_stateownerid)
1993 */
NeilBrownfd39ca92005-06-23 22:04:03 -07001994static struct nfs4_stateowner *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995find_openstateowner_id(u32 st_id, int flags) {
1996 struct nfs4_stateowner *local = NULL;
1997
1998 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1999 if (flags & CLOSE_STATE) {
2000 list_for_each_entry(local, &close_lru, so_close_lru) {
2001 if (local->so_id == st_id)
2002 return local;
2003 }
2004 }
2005 return NULL;
2006}
2007
2008static inline int
2009nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2010{
2011 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2012}
2013
2014static int
2015STALE_STATEID(stateid_t *stateid)
2016{
2017 if (stateid->si_boot == boot_time)
2018 return 0;
2019 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2020 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2021 stateid->si_generation);
2022 return 1;
2023}
2024
2025static inline int
2026access_permit_read(unsigned long access_bmap)
2027{
2028 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2029 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2030 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2031}
2032
2033static inline int
2034access_permit_write(unsigned long access_bmap)
2035{
2036 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2037 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2038}
2039
2040static
2041int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2042{
2043 int status = nfserr_openmode;
2044
2045 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2046 goto out;
2047 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2048 goto out;
2049 status = nfs_ok;
2050out:
2051 return status;
2052}
2053
2054static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2056{
2057 /* Trying to call delegreturn with a special stateid? Yuch: */
2058 if (!(flags & (RD_STATE | WR_STATE)))
2059 return nfserr_bad_stateid;
2060 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2061 return nfs_ok;
2062 else if (nfs4_in_grace()) {
2063 /* Answer in remaining cases depends on existance of
2064 * conflicting state; so we must wait out the grace period. */
2065 return nfserr_grace;
2066 } else if (flags & WR_STATE)
2067 return nfs4_share_conflict(current_fh,
2068 NFS4_SHARE_DENY_WRITE);
2069 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2070 return nfs4_share_conflict(current_fh,
2071 NFS4_SHARE_DENY_READ);
2072}
2073
2074/*
2075 * Allow READ/WRITE during grace period on recovered state only for files
2076 * that are not able to provide mandatory locking.
2077 */
2078static inline int
2079io_during_grace_disallowed(struct inode *inode, int flags)
2080{
2081 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2082 && MANDATORY_LOCK(inode);
2083}
2084
2085/*
2086* Checks for stateid operations
2087*/
2088int
2089nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2090{
2091 struct nfs4_stateid *stp = NULL;
2092 struct nfs4_delegation *dp = NULL;
2093 stateid_t *stidp;
2094 struct inode *ino = current_fh->fh_dentry->d_inode;
2095 int status;
2096
2097 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2098 stateid->si_boot, stateid->si_stateownerid,
2099 stateid->si_fileid, stateid->si_generation);
2100 if (filpp)
2101 *filpp = NULL;
2102
2103 if (io_during_grace_disallowed(ino, flags))
2104 return nfserr_grace;
2105
2106 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2107 return check_special_stateids(current_fh, stateid, flags);
2108
2109 /* STALE STATEID */
2110 status = nfserr_stale_stateid;
2111 if (STALE_STATEID(stateid))
2112 goto out;
2113
2114 /* BAD STATEID */
2115 status = nfserr_bad_stateid;
2116 if (!stateid->si_fileid) { /* delegation stateid */
2117 if(!(dp = find_delegation_stateid(ino, stateid))) {
2118 dprintk("NFSD: delegation stateid not found\n");
2119 if (nfs4_in_grace())
2120 status = nfserr_grace;
2121 goto out;
2122 }
2123 stidp = &dp->dl_stateid;
2124 } else { /* open or lock stateid */
2125 if (!(stp = find_stateid(stateid, flags))) {
2126 dprintk("NFSD: open or lock stateid not found\n");
2127 if (nfs4_in_grace())
2128 status = nfserr_grace;
2129 goto out;
2130 }
2131 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2132 goto out;
2133 if (!stp->st_stateowner->so_confirmed)
2134 goto out;
2135 stidp = &stp->st_stateid;
2136 }
2137 if (stateid->si_generation > stidp->si_generation)
2138 goto out;
2139
2140 /* OLD STATEID */
2141 status = nfserr_old_stateid;
2142 if (stateid->si_generation < stidp->si_generation)
2143 goto out;
2144 if (stp) {
2145 if ((status = nfs4_check_openmode(stp,flags)))
2146 goto out;
2147 renew_client(stp->st_stateowner->so_client);
2148 if (filpp)
2149 *filpp = stp->st_vfs_file;
2150 } else if (dp) {
2151 if ((status = nfs4_check_delegmode(dp, flags)))
2152 goto out;
2153 renew_client(dp->dl_client);
2154 if (flags & DELEG_RET)
2155 unhash_delegation(dp);
2156 if (filpp)
2157 *filpp = dp->dl_vfs_file;
2158 }
2159 status = nfs_ok;
2160out:
2161 return status;
2162}
2163
2164
2165/*
2166 * Checks for sequence id mutating operations.
2167 */
NeilBrownfd39ca92005-06-23 22:04:03 -07002168static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169nfs4_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)
2170{
2171 int status;
2172 struct nfs4_stateid *stp;
2173 struct nfs4_stateowner *sop;
2174
2175 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2176 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2177 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2178 stateid->si_generation);
2179
2180 *stpp = NULL;
2181 *sopp = NULL;
2182
2183 status = nfserr_bad_stateid;
2184 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2185 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2186 goto out;
2187 }
2188
2189 status = nfserr_stale_stateid;
2190 if (STALE_STATEID(stateid))
2191 goto out;
2192 /*
2193 * We return BAD_STATEID if filehandle doesn't match stateid,
2194 * the confirmed flag is incorrecly set, or the generation
2195 * number is incorrect.
2196 * If there is no entry in the openfile table for this id,
2197 * we can't always return BAD_STATEID;
2198 * this might be a retransmitted CLOSE which has arrived after
2199 * the openfile has been released.
2200 */
2201 if (!(stp = find_stateid(stateid, flags)))
2202 goto no_nfs4_stateid;
2203
2204 status = nfserr_bad_stateid;
2205
2206 /* for new lock stateowners:
2207 * check that the lock->v.new.open_stateid
2208 * refers to an open stateowner
2209 *
2210 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2211 * as the open_stateid->st_stateowner->so_client->clientid
2212 */
2213 if (lockclid) {
2214 struct nfs4_stateowner *sop = stp->st_stateowner;
2215 struct nfs4_client *clp = sop->so_client;
2216
2217 if (!sop->so_is_open_owner)
2218 goto out;
2219 if (!cmp_clid(&clp->cl_clientid, lockclid))
2220 goto out;
2221 }
2222
2223 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2224 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2225 goto out;
2226 }
2227
2228 *stpp = stp;
2229 *sopp = sop = stp->st_stateowner;
2230
2231 /*
2232 * We now validate the seqid and stateid generation numbers.
2233 * For the moment, we ignore the possibility of
2234 * generation number wraparound.
2235 */
NeilBrownbd9aac52005-07-07 17:59:19 -07002236 if (seqid != sop->so_seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 goto check_replay;
2238
2239 if (sop->so_confirmed) {
2240 if (flags & CONFIRM) {
2241 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2242 goto out;
2243 }
2244 }
2245 else {
2246 if (!(flags & CONFIRM)) {
2247 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2248 goto out;
2249 }
2250 }
2251 if (stateid->si_generation > stp->st_stateid.si_generation) {
2252 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2253 goto out;
2254 }
2255
2256 status = nfserr_old_stateid;
2257 if (stateid->si_generation < stp->st_stateid.si_generation) {
2258 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2259 goto out;
2260 }
2261 /* XXX renew the client lease here */
2262 status = nfs_ok;
2263
2264out:
2265 return status;
2266
2267no_nfs4_stateid:
2268
2269 /*
2270 * We determine whether this is a bad stateid or a replay,
2271 * starting by trying to look up the stateowner.
2272 * If stateowner is not found - stateid is bad.
2273 */
2274 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2275 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2276 status = nfserr_bad_stateid;
2277 goto out;
2278 }
2279 *sopp = sop;
2280
2281check_replay:
NeilBrownbd9aac52005-07-07 17:59:19 -07002282 if (seqid == sop->so_seqid - 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2284 /* indicate replay to calling function */
2285 status = NFSERR_REPLAY_ME;
2286 } else {
NeilBrownbd9aac52005-07-07 17:59:19 -07002287 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid, seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288
2289 *sopp = NULL;
2290 status = nfserr_bad_seqid;
2291 }
2292 goto out;
2293}
2294
2295int
2296nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2297{
2298 int status;
2299 struct nfs4_stateowner *sop;
2300 struct nfs4_stateid *stp;
2301
2302 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2303 (int)current_fh->fh_dentry->d_name.len,
2304 current_fh->fh_dentry->d_name.name);
2305
2306 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2307 goto out;
2308
2309 nfs4_lock_state();
2310
2311 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2312 &oc->oc_req_stateid,
2313 CHECK_FH | CONFIRM | OPEN_STATE,
2314 &oc->oc_stateowner, &stp, NULL)))
2315 goto out;
2316
2317 sop = oc->oc_stateowner;
2318 sop->so_confirmed = 1;
2319 update_stateid(&stp->st_stateid);
2320 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2321 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2322 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2323 stp->st_stateid.si_boot,
2324 stp->st_stateid.si_stateownerid,
2325 stp->st_stateid.si_fileid,
2326 stp->st_stateid.si_generation);
NeilBrownc7b9a452005-06-23 22:04:30 -07002327
2328 nfsd4_create_clid_dir(sop->so_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329out:
2330 if (oc->oc_stateowner)
2331 nfs4_get_stateowner(oc->oc_stateowner);
2332 nfs4_unlock_state();
2333 return status;
2334}
2335
2336
2337/*
2338 * unset all bits in union bitmap (bmap) that
2339 * do not exist in share (from successful OPEN_DOWNGRADE)
2340 */
2341static void
2342reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2343{
2344 int i;
2345 for (i = 1; i < 4; i++) {
2346 if ((i & access) != i)
2347 __clear_bit(i, bmap);
2348 }
2349}
2350
2351static void
2352reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2353{
2354 int i;
2355 for (i = 0; i < 4; i++) {
2356 if ((i & deny) != i)
2357 __clear_bit(i, bmap);
2358 }
2359}
2360
2361int
2362nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2363{
2364 int status;
2365 struct nfs4_stateid *stp;
2366 unsigned int share_access;
2367
2368 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2369 (int)current_fh->fh_dentry->d_name.len,
2370 current_fh->fh_dentry->d_name.name);
2371
2372 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2373 return nfserr_inval;
2374
2375 nfs4_lock_state();
2376 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2377 &od->od_stateid,
2378 CHECK_FH | OPEN_STATE,
2379 &od->od_stateowner, &stp, NULL)))
2380 goto out;
2381
2382 status = nfserr_inval;
2383 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2384 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2385 stp->st_access_bmap, od->od_share_access);
2386 goto out;
2387 }
2388 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2389 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2390 stp->st_deny_bmap, od->od_share_deny);
2391 goto out;
2392 }
2393 set_access(&share_access, stp->st_access_bmap);
2394 nfs4_file_downgrade(stp->st_vfs_file,
2395 share_access & ~od->od_share_access);
2396
2397 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2398 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2399
2400 update_stateid(&stp->st_stateid);
2401 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2402 status = nfs_ok;
2403out:
2404 if (od->od_stateowner)
2405 nfs4_get_stateowner(od->od_stateowner);
2406 nfs4_unlock_state();
2407 return status;
2408}
2409
2410/*
2411 * nfs4_unlock_state() called after encode
2412 */
2413int
2414nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2415{
2416 int status;
2417 struct nfs4_stateid *stp;
2418
2419 dprintk("NFSD: nfsd4_close on file %.*s\n",
2420 (int)current_fh->fh_dentry->d_name.len,
2421 current_fh->fh_dentry->d_name.name);
2422
2423 nfs4_lock_state();
2424 /* check close_lru for replay */
2425 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2426 &close->cl_stateid,
2427 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2428 &close->cl_stateowner, &stp, NULL)))
2429 goto out;
2430 /*
2431 * Return success, but first update the stateid.
2432 */
2433 status = nfs_ok;
2434 update_stateid(&stp->st_stateid);
2435 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2436
2437 /* release_state_owner() calls nfsd_close() if needed */
2438 release_state_owner(stp, OPEN_STATE);
2439out:
2440 if (close->cl_stateowner)
2441 nfs4_get_stateowner(close->cl_stateowner);
2442 nfs4_unlock_state();
2443 return status;
2444}
2445
2446int
2447nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2448{
2449 int status;
2450
2451 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2452 goto out;
2453
2454 nfs4_lock_state();
2455 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2456 nfs4_unlock_state();
2457out:
2458 return status;
2459}
2460
2461
2462/*
2463 * Lock owner state (byte-range locks)
2464 */
2465#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2466#define LOCK_HASH_BITS 8
2467#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2468#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2469
2470#define lockownerid_hashval(id) \
2471 ((id) & LOCK_HASH_MASK)
2472
2473static inline unsigned int
2474lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2475 struct xdr_netobj *ownername)
2476{
2477 return (file_hashval(inode) + cl_id
2478 + opaque_hashval(ownername->data, ownername->len))
2479 & LOCK_HASH_MASK;
2480}
2481
2482static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2483static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2484static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2485
NeilBrownfd39ca92005-06-23 22:04:03 -07002486static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487find_stateid(stateid_t *stid, int flags)
2488{
2489 struct nfs4_stateid *local = NULL;
2490 u32 st_id = stid->si_stateownerid;
2491 u32 f_id = stid->si_fileid;
2492 unsigned int hashval;
2493
2494 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2495 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2496 hashval = stateid_hashval(st_id, f_id);
2497 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2498 if ((local->st_stateid.si_stateownerid == st_id) &&
2499 (local->st_stateid.si_fileid == f_id))
2500 return local;
2501 }
2502 }
2503 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2504 hashval = stateid_hashval(st_id, f_id);
2505 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2506 if ((local->st_stateid.si_stateownerid == st_id) &&
2507 (local->st_stateid.si_fileid == f_id))
2508 return local;
2509 }
2510 } else
2511 printk("NFSD: find_stateid: ERROR: no state flag\n");
2512 return NULL;
2513}
2514
2515static struct nfs4_delegation *
2516find_delegation_stateid(struct inode *ino, stateid_t *stid)
2517{
NeilBrown13cd2182005-06-23 22:03:10 -07002518 struct nfs4_file *fp;
2519 struct nfs4_delegation *dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002520
2521 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2522 stid->si_boot, stid->si_stateownerid,
2523 stid->si_fileid, stid->si_generation);
2524
Linus Torvalds1da177e2005-04-16 15:20:36 -07002525 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07002526 if (!fp)
2527 return NULL;
2528 dl = find_delegation_file(fp, stid);
2529 put_nfs4_file(fp);
2530 return dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531}
2532
2533/*
2534 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2535 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2536 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2537 * locking, this prevents us from being completely protocol-compliant. The
2538 * real solution to this problem is to start using unsigned file offsets in
2539 * the VFS, but this is a very deep change!
2540 */
2541static inline void
2542nfs4_transform_lock_offset(struct file_lock *lock)
2543{
2544 if (lock->fl_start < 0)
2545 lock->fl_start = OFFSET_MAX;
2546 if (lock->fl_end < 0)
2547 lock->fl_end = OFFSET_MAX;
2548}
2549
NeilBrownfd39ca92005-06-23 22:04:03 -07002550static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002551nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2552{
2553 struct nfs4_stateowner *local = NULL;
2554 int status = 0;
2555
2556 if (hashval >= LOCK_HASH_SIZE)
2557 goto out;
2558 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2559 if (local == sop) {
2560 status = 1;
2561 goto out;
2562 }
2563 }
2564out:
2565 return status;
2566}
2567
2568
2569static inline void
2570nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2571{
2572 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2573 unsigned int hval = lockownerid_hashval(sop->so_id);
2574
2575 deny->ld_sop = NULL;
2576 if (nfs4_verify_lock_stateowner(sop, hval)) {
2577 kref_get(&sop->so_ref);
2578 deny->ld_sop = sop;
2579 deny->ld_clientid = sop->so_client->cl_clientid;
2580 }
2581 deny->ld_start = fl->fl_start;
2582 deny->ld_length = ~(u64)0;
2583 if (fl->fl_end != ~(u64)0)
2584 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2585 deny->ld_type = NFS4_READ_LT;
2586 if (fl->fl_type != F_RDLCK)
2587 deny->ld_type = NFS4_WRITE_LT;
2588}
2589
2590static struct nfs4_stateowner *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2592 struct xdr_netobj *owner)
2593{
2594 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2595 struct nfs4_stateowner *op;
2596
2597 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2598 if (cmp_owner_str(op, owner, clid))
2599 return op;
2600 }
2601 return NULL;
2602}
2603
2604/*
2605 * Alloc a lock owner structure.
2606 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2607 * occured.
2608 *
2609 * strhashval = lock_ownerstr_hashval
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610 */
2611
2612static struct nfs4_stateowner *
2613alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2614 struct nfs4_stateowner *sop;
2615 struct nfs4_replay *rp;
2616 unsigned int idhashval;
2617
2618 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2619 return NULL;
2620 idhashval = lockownerid_hashval(current_ownerid);
2621 INIT_LIST_HEAD(&sop->so_idhash);
2622 INIT_LIST_HEAD(&sop->so_strhash);
2623 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07002624 INIT_LIST_HEAD(&sop->so_stateids);
2625 INIT_LIST_HEAD(&sop->so_perstateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2627 sop->so_time = 0;
2628 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2629 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07002630 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631 sop->so_is_open_owner = 0;
2632 sop->so_id = current_ownerid++;
2633 sop->so_client = clp;
NeilBrownbd9aac52005-07-07 17:59:19 -07002634 sop->so_seqid = lock->lk_new_lock_seqid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635 sop->so_confirmed = 1;
2636 rp = &sop->so_replay;
2637 rp->rp_status = NFSERR_SERVERFAULT;
2638 rp->rp_buflen = 0;
2639 rp->rp_buf = rp->rp_ibuf;
2640 return sop;
2641}
2642
NeilBrownfd39ca92005-06-23 22:04:03 -07002643static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2645{
2646 struct nfs4_stateid *stp;
2647 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2648
NeilBrown5ac049a2005-06-23 22:03:03 -07002649 stp = nfs4_alloc_stateid();
2650 if (stp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 goto out;
2652 INIT_LIST_HEAD(&stp->st_hash);
2653 INIT_LIST_HEAD(&stp->st_perfile);
NeilBrownea1da632005-06-23 22:04:17 -07002654 INIT_LIST_HEAD(&stp->st_perstateowner);
2655 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
NeilBrown8beefa22005-06-23 22:03:08 -07002657 list_add(&stp->st_perfile, &fp->fi_stateids);
NeilBrownea1da632005-06-23 22:04:17 -07002658 list_add(&stp->st_perstateowner, &sop->so_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07002660 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 stp->st_file = fp;
2662 stp->st_stateid.si_boot = boot_time;
2663 stp->st_stateid.si_stateownerid = sop->so_id;
2664 stp->st_stateid.si_fileid = fp->fi_id;
2665 stp->st_stateid.si_generation = 0;
2666 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2667 stp->st_access_bmap = open_stp->st_access_bmap;
2668 stp->st_deny_bmap = open_stp->st_deny_bmap;
2669
2670out:
2671 return stp;
2672}
2673
NeilBrownfd39ca92005-06-23 22:04:03 -07002674static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675check_lock_length(u64 offset, u64 length)
2676{
2677 return ((length == 0) || ((length != ~(u64)0) &&
2678 LOFF_OVERFLOW(offset, length)));
2679}
2680
2681/*
2682 * LOCK operation
2683 */
2684int
2685nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2686{
NeilBrown3e9e3db2005-06-23 22:04:20 -07002687 struct nfs4_stateowner *open_sop = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688 struct nfs4_stateid *lock_stp;
2689 struct file *filp;
2690 struct file_lock file_lock;
2691 struct file_lock *conflock;
2692 int status = 0;
2693 unsigned int strhashval;
2694
2695 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2696 (long long) lock->lk_offset,
2697 (long long) lock->lk_length);
2698
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 if (check_lock_length(lock->lk_offset, lock->lk_length))
2700 return nfserr_inval;
2701
2702 nfs4_lock_state();
2703
2704 if (lock->lk_is_new) {
NeilBrown893f8772005-07-07 17:59:17 -07002705 /*
2706 * Client indicates that this is a new lockowner.
2707 * Use open owner and open stateid to create lock owner and
2708 * lock stateid.
2709 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 struct nfs4_stateid *open_stp = NULL;
2711 struct nfs4_file *fp;
2712
2713 status = nfserr_stale_clientid;
2714 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2715 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2716 goto out;
2717 }
2718
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719 /* validate and update open stateid and open seqid */
2720 status = nfs4_preprocess_seqid_op(current_fh,
2721 lock->lk_new_open_seqid,
2722 &lock->lk_new_open_stateid,
2723 CHECK_FH | OPEN_STATE,
2724 &open_sop, &open_stp,
2725 &lock->v.new.clientid);
NeilBrown37515172005-07-07 17:59:16 -07002726 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002727 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728 /* create lockowner and lock stateid */
2729 fp = open_stp->st_file;
2730 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2731 open_sop->so_client->cl_clientid.cl_id,
2732 &lock->v.new.owner);
NeilBrown3e9e3db2005-06-23 22:04:20 -07002733 /* XXX: Do we need to check for duplicate stateowners on
2734 * the same file, or should they just be allowed (and
2735 * create new stateids)? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 status = nfserr_resource;
2737 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2738 goto out;
2739 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2740 fp, open_stp)) == NULL) {
2741 release_stateowner(lock->lk_stateowner);
2742 lock->lk_stateowner = NULL;
2743 goto out;
2744 }
2745 /* bump the open seqid used to create the lock */
2746 open_sop->so_seqid++;
2747 } else {
2748 /* lock (lock owner + lock stateid) already exists */
2749 status = nfs4_preprocess_seqid_op(current_fh,
2750 lock->lk_old_lock_seqid,
2751 &lock->lk_old_lock_stateid,
2752 CHECK_FH | LOCK_STATE,
2753 &lock->lk_stateowner, &lock_stp, NULL);
2754 if (status)
2755 goto out;
2756 }
2757 /* lock->lk_stateowner and lock_stp have been created or found */
2758 filp = lock_stp->st_vfs_file;
2759
2760 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2761 printk("NFSD: nfsd4_lock: permission denied!\n");
2762 goto out;
2763 }
2764
NeilBrown0dd395d2005-07-07 17:59:15 -07002765 status = nfserr_grace;
2766 if (nfs4_in_grace() && !lock->lk_reclaim)
2767 goto out;
2768 status = nfserr_no_grace;
2769 if (!nfs4_in_grace() && lock->lk_reclaim)
2770 goto out;
2771
Linus Torvalds1da177e2005-04-16 15:20:36 -07002772 locks_init_lock(&file_lock);
2773 switch (lock->lk_type) {
2774 case NFS4_READ_LT:
2775 case NFS4_READW_LT:
2776 file_lock.fl_type = F_RDLCK;
2777 break;
2778 case NFS4_WRITE_LT:
2779 case NFS4_WRITEW_LT:
2780 file_lock.fl_type = F_WRLCK;
2781 break;
2782 default:
2783 status = nfserr_inval;
2784 goto out;
2785 }
2786 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2787 file_lock.fl_pid = current->tgid;
2788 file_lock.fl_file = filp;
2789 file_lock.fl_flags = FL_POSIX;
2790
2791 file_lock.fl_start = lock->lk_offset;
2792 if ((lock->lk_length == ~(u64)0) ||
2793 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2794 file_lock.fl_end = ~(u64)0;
2795 else
2796 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2797 nfs4_transform_lock_offset(&file_lock);
2798
2799 /*
2800 * Try to lock the file in the VFS.
2801 * Note: locks.c uses the BKL to protect the inode's lock list.
2802 */
2803
2804 status = posix_lock_file(filp, &file_lock);
2805 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2806 file_lock.fl_ops->fl_release_private(&file_lock);
2807 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2808 switch (-status) {
2809 case 0: /* success! */
2810 update_stateid(&lock_stp->st_stateid);
2811 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2812 sizeof(stateid_t));
2813 goto out;
2814 case (EAGAIN):
2815 goto conflicting_lock;
2816 case (EDEADLK):
2817 status = nfserr_deadlock;
2818 default:
2819 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2820 goto out_destroy_new_stateid;
2821 }
2822
2823conflicting_lock:
2824 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2825 status = nfserr_denied;
2826 /* XXX There is a race here. Future patch needed to provide
2827 * an atomic posix_lock_and_test_file
2828 */
2829 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2830 status = nfserr_serverfault;
2831 goto out;
2832 }
2833 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2834
2835out_destroy_new_stateid:
2836 if (lock->lk_is_new) {
2837 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
NeilBrown893f8772005-07-07 17:59:17 -07002838 /*
2839 * An error encountered after instantiation of the new
2840 * stateid has forced us to destroy it.
2841 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 if (!seqid_mutating_err(status))
2843 open_sop->so_seqid--;
2844
2845 release_state_owner(lock_stp, LOCK_STATE);
2846 }
2847out:
2848 if (lock->lk_stateowner)
2849 nfs4_get_stateowner(lock->lk_stateowner);
2850 nfs4_unlock_state();
2851 return status;
2852}
2853
2854/*
2855 * LOCKT operation
2856 */
2857int
2858nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2859{
2860 struct inode *inode;
2861 struct file file;
2862 struct file_lock file_lock;
2863 struct file_lock *conflicting_lock;
2864 int status;
2865
2866 if (nfs4_in_grace())
2867 return nfserr_grace;
2868
2869 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2870 return nfserr_inval;
2871
2872 lockt->lt_stateowner = NULL;
2873 nfs4_lock_state();
2874
2875 status = nfserr_stale_clientid;
2876 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2877 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2878 goto out;
2879 }
2880
2881 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2882 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2883 if (status == nfserr_symlink)
2884 status = nfserr_inval;
2885 goto out;
2886 }
2887
2888 inode = current_fh->fh_dentry->d_inode;
2889 locks_init_lock(&file_lock);
2890 switch (lockt->lt_type) {
2891 case NFS4_READ_LT:
2892 case NFS4_READW_LT:
2893 file_lock.fl_type = F_RDLCK;
2894 break;
2895 case NFS4_WRITE_LT:
2896 case NFS4_WRITEW_LT:
2897 file_lock.fl_type = F_WRLCK;
2898 break;
2899 default:
2900 printk("NFSD: nfs4_lockt: bad lock type!\n");
2901 status = nfserr_inval;
2902 goto out;
2903 }
2904
2905 lockt->lt_stateowner = find_lockstateowner_str(inode,
2906 &lockt->lt_clientid, &lockt->lt_owner);
2907 if (lockt->lt_stateowner)
2908 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2909 file_lock.fl_pid = current->tgid;
2910 file_lock.fl_flags = FL_POSIX;
2911
2912 file_lock.fl_start = lockt->lt_offset;
2913 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2914 file_lock.fl_end = ~(u64)0;
2915 else
2916 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2917
2918 nfs4_transform_lock_offset(&file_lock);
2919
2920 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2921 * since LOCKT doesn't require an OPEN, and therefore a struct
2922 * file may not exist, pass posix_test_lock a struct file with
2923 * only the dentry:inode set.
2924 */
2925 memset(&file, 0, sizeof (struct file));
2926 file.f_dentry = current_fh->fh_dentry;
2927
2928 status = nfs_ok;
2929 conflicting_lock = posix_test_lock(&file, &file_lock);
2930 if (conflicting_lock) {
2931 status = nfserr_denied;
2932 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2933 }
2934out:
2935 nfs4_unlock_state();
2936 return status;
2937}
2938
2939int
2940nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2941{
2942 struct nfs4_stateid *stp;
2943 struct file *filp = NULL;
2944 struct file_lock file_lock;
2945 int status;
2946
2947 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2948 (long long) locku->lu_offset,
2949 (long long) locku->lu_length);
2950
2951 if (check_lock_length(locku->lu_offset, locku->lu_length))
2952 return nfserr_inval;
2953
2954 nfs4_lock_state();
2955
2956 if ((status = nfs4_preprocess_seqid_op(current_fh,
2957 locku->lu_seqid,
2958 &locku->lu_stateid,
2959 CHECK_FH | LOCK_STATE,
2960 &locku->lu_stateowner, &stp, NULL)))
2961 goto out;
2962
2963 filp = stp->st_vfs_file;
2964 BUG_ON(!filp);
2965 locks_init_lock(&file_lock);
2966 file_lock.fl_type = F_UNLCK;
2967 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2968 file_lock.fl_pid = current->tgid;
2969 file_lock.fl_file = filp;
2970 file_lock.fl_flags = FL_POSIX;
2971 file_lock.fl_start = locku->lu_offset;
2972
2973 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2974 file_lock.fl_end = ~(u64)0;
2975 else
2976 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2977 nfs4_transform_lock_offset(&file_lock);
2978
2979 /*
2980 * Try to unlock the file in the VFS.
2981 */
2982 status = posix_lock_file(filp, &file_lock);
2983 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2984 file_lock.fl_ops->fl_release_private(&file_lock);
2985 if (status) {
2986 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2987 goto out_nfserr;
2988 }
2989 /*
2990 * OK, unlock succeeded; the only thing left to do is update the stateid.
2991 */
2992 update_stateid(&stp->st_stateid);
2993 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2994
2995out:
2996 if (locku->lu_stateowner)
2997 nfs4_get_stateowner(locku->lu_stateowner);
2998 nfs4_unlock_state();
2999 return status;
3000
3001out_nfserr:
3002 status = nfserrno(status);
3003 goto out;
3004}
3005
3006/*
3007 * returns
3008 * 1: locks held by lockowner
3009 * 0: no locks held by lockowner
3010 */
3011static int
3012check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3013{
3014 struct file_lock **flpp;
3015 struct inode *inode = filp->f_dentry->d_inode;
3016 int status = 0;
3017
3018 lock_kernel();
3019 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3020 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3021 status = 1;
3022 goto out;
3023 }
3024out:
3025 unlock_kernel();
3026 return status;
3027}
3028
3029int
3030nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3031{
3032 clientid_t *clid = &rlockowner->rl_clientid;
NeilBrown3e9e3db2005-06-23 22:04:20 -07003033 struct nfs4_stateowner *sop;
3034 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003035 struct xdr_netobj *owner = &rlockowner->rl_owner;
NeilBrown3e9e3db2005-06-23 22:04:20 -07003036 struct list_head matches;
3037 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038 int status;
3039
3040 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3041 clid->cl_boot, clid->cl_id);
3042
3043 /* XXX check for lease expiration */
3044
3045 status = nfserr_stale_clientid;
3046 if (STALE_CLIENTID(clid)) {
3047 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3048 return status;
3049 }
3050
3051 nfs4_lock_state();
3052
NeilBrown3e9e3db2005-06-23 22:04:20 -07003053 status = nfserr_locks_held;
3054 /* XXX: we're doing a linear search through all the lockowners.
3055 * Yipes! For now we'll just hope clients aren't really using
3056 * release_lockowner much, but eventually we have to fix these
3057 * data structures. */
3058 INIT_LIST_HEAD(&matches);
3059 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3060 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3061 if (!cmp_owner_str(sop, owner, clid))
3062 continue;
3063 list_for_each_entry(stp, &sop->so_stateids,
3064 st_perstateowner) {
3065 if (check_for_locks(stp->st_vfs_file, sop))
3066 goto out;
3067 /* Note: so_perclient unused for lockowners,
3068 * so it's OK to fool with here. */
3069 list_add(&sop->so_perclient, &matches);
3070 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 }
NeilBrown3e9e3db2005-06-23 22:04:20 -07003072 }
3073 /* Clients probably won't expect us to return with some (but not all)
3074 * of the lockowner state released; so don't release any until all
3075 * have been checked. */
3076 status = nfs_ok;
NeilBrown0fa822e2005-07-07 17:59:14 -07003077 while (!list_empty(&matches)) {
3078 sop = list_entry(matches.next, struct nfs4_stateowner,
3079 so_perclient);
3080 /* unhash_stateowner deletes so_perclient only
3081 * for openowners. */
3082 list_del(&sop->so_perclient);
NeilBrown3e9e3db2005-06-23 22:04:20 -07003083 release_stateowner(sop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084 }
3085out:
3086 nfs4_unlock_state();
3087 return status;
3088}
3089
3090static inline struct nfs4_client_reclaim *
NeilBrowna55370a2005-06-23 22:03:52 -07003091alloc_reclaim(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003092{
NeilBrowna55370a2005-06-23 22:03:52 -07003093 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094}
3095
NeilBrownc7b9a452005-06-23 22:04:30 -07003096int
3097nfs4_has_reclaimed_state(const char *name)
3098{
3099 unsigned int strhashval = clientstr_hashval(name);
3100 struct nfs4_client *clp;
3101
3102 clp = find_confirmed_client_by_str(name, strhashval);
3103 return clp ? 1 : 0;
3104}
3105
Linus Torvalds1da177e2005-04-16 15:20:36 -07003106/*
3107 * failure => all reset bets are off, nfserr_no_grace...
3108 */
NeilBrown190e4fb2005-06-23 22:04:25 -07003109int
3110nfs4_client_to_reclaim(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003111{
3112 unsigned int strhashval;
3113 struct nfs4_client_reclaim *crp = NULL;
3114
NeilBrowna55370a2005-06-23 22:03:52 -07003115 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3116 crp = alloc_reclaim();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003117 if (!crp)
3118 return 0;
NeilBrowna55370a2005-06-23 22:03:52 -07003119 strhashval = clientstr_hashval(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003120 INIT_LIST_HEAD(&crp->cr_strhash);
3121 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
NeilBrowna55370a2005-06-23 22:03:52 -07003122 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123 reclaim_str_hashtbl_size++;
3124 return 1;
3125}
3126
3127static void
3128nfs4_release_reclaim(void)
3129{
3130 struct nfs4_client_reclaim *crp = NULL;
3131 int i;
3132
Linus Torvalds1da177e2005-04-16 15:20:36 -07003133 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3134 while (!list_empty(&reclaim_str_hashtbl[i])) {
3135 crp = list_entry(reclaim_str_hashtbl[i].next,
3136 struct nfs4_client_reclaim, cr_strhash);
3137 list_del(&crp->cr_strhash);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003138 kfree(crp);
3139 reclaim_str_hashtbl_size--;
3140 }
3141 }
3142 BUG_ON(reclaim_str_hashtbl_size);
3143}
3144
3145/*
3146 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
NeilBrownfd39ca92005-06-23 22:04:03 -07003147static struct nfs4_client_reclaim *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003148nfs4_find_reclaim_client(clientid_t *clid)
3149{
3150 unsigned int strhashval;
3151 struct nfs4_client *clp;
3152 struct nfs4_client_reclaim *crp = NULL;
3153
3154
3155 /* find clientid in conf_id_hashtbl */
3156 clp = find_confirmed_client(clid);
3157 if (clp == NULL)
3158 return NULL;
3159
NeilBrowna55370a2005-06-23 22:03:52 -07003160 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3161 clp->cl_name.len, clp->cl_name.data,
3162 clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003163
3164 /* find clp->cl_name in reclaim_str_hashtbl */
NeilBrowna55370a2005-06-23 22:03:52 -07003165 strhashval = clientstr_hashval(clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003166 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
NeilBrowna55370a2005-06-23 22:03:52 -07003167 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003168 return crp;
3169 }
3170 }
3171 return NULL;
3172}
3173
3174/*
3175* Called from OPEN. Look for clientid in reclaim list.
3176*/
3177int
3178nfs4_check_open_reclaim(clientid_t *clid)
3179{
NeilBrowndfc83562005-06-23 22:03:16 -07003180 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003181}
3182
NeilBrownac4d8ff2005-06-23 22:03:30 -07003183/* initialization to perform at module load time: */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184
NeilBrownac4d8ff2005-06-23 22:03:30 -07003185void
3186nfs4_state_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003187{
3188 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003189
Linus Torvalds1da177e2005-04-16 15:20:36 -07003190 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3191 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3192 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3193 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3194 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3195 }
3196 for (i = 0; i < FILE_HASH_SIZE; i++) {
3197 INIT_LIST_HEAD(&file_hashtbl[i]);
3198 }
3199 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3200 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3201 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3202 }
3203 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3204 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3205 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3206 }
3207 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3208 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3209 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003211 memset(&onestateid, ~0, sizeof(stateid_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212 INIT_LIST_HEAD(&close_lru);
3213 INIT_LIST_HEAD(&client_lru);
3214 INIT_LIST_HEAD(&del_recall_lru);
NeilBrownac4d8ff2005-06-23 22:03:30 -07003215 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3216 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3217 reclaim_str_hashtbl_size = 0;
NeilBrownac4d8ff2005-06-23 22:03:30 -07003218}
3219
NeilBrown190e4fb2005-06-23 22:04:25 -07003220static void
3221nfsd4_load_reboot_recovery_data(void)
3222{
3223 int status;
3224
NeilBrown0964a3d2005-06-23 22:04:32 -07003225 nfs4_lock_state();
3226 nfsd4_init_recdir(user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -07003227 status = nfsd4_recdir_load();
NeilBrown0964a3d2005-06-23 22:04:32 -07003228 nfs4_unlock_state();
NeilBrown190e4fb2005-06-23 22:04:25 -07003229 if (status)
3230 printk("NFSD: Failure reading reboot recovery data\n");
3231}
3232
NeilBrownac4d8ff2005-06-23 22:03:30 -07003233/* initialization to perform when the nfsd service is started: */
3234
3235static void
3236__nfs4_state_start(void)
3237{
3238 time_t grace_time;
3239
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240 boot_time = get_seconds();
NeilBrownd99a05a2005-06-23 22:03:21 -07003241 grace_time = max(user_lease_time, lease_time);
3242 lease_time = user_lease_time;
NeilBrowna76b4312005-06-23 22:04:01 -07003243 in_grace = 1;
NeilBrownd99a05a2005-06-23 22:03:21 -07003244 printk("NFSD: starting %ld-second grace period\n", grace_time);
NeilBrown58da2822005-06-23 22:03:19 -07003245 laundry_wq = create_singlethread_workqueue("nfsd4");
NeilBrowna76b4312005-06-23 22:04:01 -07003246 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003247}
3248
3249int
NeilBrown76a35502005-06-23 22:03:26 -07003250nfs4_state_start(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003251{
3252 int status;
3253
3254 if (nfs4_init)
3255 return 0;
3256 status = nfsd4_init_slabs();
3257 if (status)
3258 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -07003259 nfsd4_load_reboot_recovery_data();
NeilBrown76a35502005-06-23 22:03:26 -07003260 __nfs4_state_start();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003261 nfs4_init = 1;
3262 return 0;
3263}
3264
3265int
3266nfs4_in_grace(void)
3267{
NeilBrowna76b4312005-06-23 22:04:01 -07003268 return in_grace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003269}
3270
3271time_t
3272nfs4_lease_time(void)
3273{
3274 return lease_time;
3275}
3276
3277static void
3278__nfs4_state_shutdown(void)
3279{
3280 int i;
3281 struct nfs4_client *clp = NULL;
3282 struct nfs4_delegation *dp = NULL;
3283 struct nfs4_stateowner *sop = NULL;
3284 struct list_head *pos, *next, reaplist;
3285
3286 list_for_each_safe(pos, next, &close_lru) {
3287 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3288 list_del(&sop->so_close_lru);
3289 nfs4_put_stateowner(sop);
3290 }
3291
3292 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3293 while (!list_empty(&conf_id_hashtbl[i])) {
3294 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3295 expire_client(clp);
3296 }
3297 while (!list_empty(&unconf_str_hashtbl[i])) {
3298 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3299 expire_client(clp);
3300 }
3301 }
3302 INIT_LIST_HEAD(&reaplist);
3303 spin_lock(&recall_lock);
3304 list_for_each_safe(pos, next, &del_recall_lru) {
3305 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3306 list_move(&dp->dl_recall_lru, &reaplist);
3307 }
3308 spin_unlock(&recall_lock);
3309 list_for_each_safe(pos, next, &reaplist) {
3310 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3311 list_del_init(&dp->dl_recall_lru);
3312 unhash_delegation(dp);
3313 }
3314
Linus Torvalds1da177e2005-04-16 15:20:36 -07003315 cancel_delayed_work(&laundromat_work);
NeilBrown58da2822005-06-23 22:03:19 -07003316 flush_workqueue(laundry_wq);
3317 destroy_workqueue(laundry_wq);
NeilBrown190e4fb2005-06-23 22:04:25 -07003318 nfsd4_shutdown_recdir();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003319 nfs4_init = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003320}
3321
3322void
3323nfs4_state_shutdown(void)
3324{
3325 nfs4_lock_state();
3326 nfs4_release_reclaim();
3327 __nfs4_state_shutdown();
3328 nfsd4_free_slabs();
3329 nfs4_unlock_state();
3330}
3331
NeilBrown0964a3d2005-06-23 22:04:32 -07003332static void
3333nfs4_set_recdir(char *recdir)
3334{
3335 nfs4_lock_state();
3336 strcpy(user_recovery_dirname, recdir);
3337 nfs4_unlock_state();
3338}
3339
3340/*
3341 * Change the NFSv4 recovery directory to recdir.
3342 */
3343int
3344nfs4_reset_recoverydir(char *recdir)
3345{
3346 int status;
3347 struct nameidata nd;
3348
3349 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3350 if (status)
3351 return status;
3352 status = -ENOTDIR;
3353 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3354 nfs4_set_recdir(recdir);
3355 status = 0;
3356 }
3357 path_release(&nd);
3358 return status;
3359}
3360
Linus Torvalds1da177e2005-04-16 15:20:36 -07003361/*
3362 * Called when leasetime is changed.
3363 *
NeilBrownd99a05a2005-06-23 22:03:21 -07003364 * The only way the protocol gives us to handle on-the-fly lease changes is to
3365 * simulate a reboot. Instead of doing that, we just wait till the next time
3366 * we start to register any changes in lease time. If the administrator
3367 * really wants to change the lease time *now*, they can go ahead and bring
3368 * nfsd down and then back up again after changing the lease time.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003369 */
3370void
3371nfs4_reset_lease(time_t leasetime)
3372{
NeilBrownd99a05a2005-06-23 22:03:21 -07003373 lock_kernel();
3374 user_lease_time = leasetime;
3375 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003376}