blob: 1143cfb6454900e73bb65a29e315e7a5810b9114 [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:
Neil Brown849823c2005-09-13 01:25:36 -0700627 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 "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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (!check_name(clname))
Neil Brown73aea4e2005-09-13 01:25:39 -0700682 return nfserr_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
NeilBrowna55370a2005-06-23 22:03:52 -0700684 status = nfs4_make_rec_clidname(dname, &clname);
685 if (status)
Neil Brown73aea4e2005-09-13 01:25:39 -0700686 return status;
NeilBrowna55370a2005-06-23 22:03:52 -0700687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 /*
689 * XXX The Duplicate Request Cache (DRC) has been checked (??)
690 * We get here on a DRC miss.
691 */
692
NeilBrowna55370a2005-06-23 22:03:52 -0700693 strhashval = clientstr_hashval(dname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 nfs4_lock_state();
NeilBrown28ce6052005-06-23 22:03:56 -0700696 conf = find_confirmed_client_by_str(dname, strhashval);
697 if (conf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 /*
699 * CASE 0:
700 * clname match, confirmed, different principal
701 * or different ip_address
702 */
703 status = nfserr_clid_inuse;
NeilBrown28ce6052005-06-23 22:03:56 -0700704 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
705 || conf->cl_addr != ip_addr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 printk("NFSD: setclientid: string in use by client"
707 "(clientid %08x/%08x)\n",
NeilBrown28ce6052005-06-23 22:03:56 -0700708 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 goto out;
710 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 }
NeilBrown28ce6052005-06-23 22:03:56 -0700712 unconf = find_unconfirmed_client_by_str(dname, strhashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 status = nfserr_resource;
714 if (!conf) {
715 /*
716 * CASE 4:
717 * placed first, because it is the normal case.
718 */
719 if (unconf)
720 expire_client(unconf);
NeilBrowna55370a2005-06-23 22:03:52 -0700721 new = create_client(clname, dname);
722 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 goto out;
724 copy_verf(new, &clverifier);
725 new->cl_addr = ip_addr;
726 copy_cred(&new->cl_cred,&rqstp->rq_cred);
727 gen_clid(new);
728 gen_confirm(new);
729 gen_callback(new, setclid);
730 add_to_unconfirmed(new, strhashval);
731 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
732 /*
733 * CASE 1:
734 * cl_name match, confirmed, principal match
735 * verifier match: probable callback update
736 *
737 * remove any unconfirmed nfs4_client with
738 * matching cl_name, cl_verifier, and cl_clientid
739 *
740 * create and insert an unconfirmed nfs4_client with same
741 * cl_name, cl_verifier, and cl_clientid as existing
742 * nfs4_client, but with the new callback info and a
743 * new cl_confirm
744 */
NeilBrown31f4a6c2005-06-23 22:04:06 -0700745 if (unconf) {
746 /* Note this is removing unconfirmed {*x***},
747 * which is stronger than RFC recommended {vxc**}.
748 * This has the advantage that there is at most
749 * one {*x***} in either list at any time.
750 */
751 expire_client(unconf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
NeilBrowna55370a2005-06-23 22:03:52 -0700753 new = create_client(clname, dname);
754 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 goto out;
756 copy_verf(new,&conf->cl_verifier);
757 new->cl_addr = ip_addr;
758 copy_cred(&new->cl_cred,&rqstp->rq_cred);
759 copy_clid(new, conf);
760 gen_confirm(new);
761 gen_callback(new, setclid);
762 add_to_unconfirmed(new,strhashval);
763 } else if (!unconf) {
764 /*
765 * CASE 2:
766 * clname match, confirmed, principal match
767 * verfier does not match
768 * no unconfirmed. create a new unconfirmed nfs4_client
769 * using input clverifier, clname, and callback info
770 * and generate a new cl_clientid and cl_confirm.
771 */
NeilBrowna55370a2005-06-23 22:03:52 -0700772 new = create_client(clname, dname);
773 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 goto out;
775 copy_verf(new,&clverifier);
776 new->cl_addr = ip_addr;
777 copy_cred(&new->cl_cred,&rqstp->rq_cred);
778 gen_clid(new);
779 gen_confirm(new);
780 gen_callback(new, setclid);
781 add_to_unconfirmed(new, strhashval);
782 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
783 /*
784 * CASE3:
785 * confirmed found (name, principal match)
786 * confirmed verifier does not match input clverifier
787 *
788 * unconfirmed found (name match)
789 * confirmed->cl_confirm != unconfirmed->cl_confirm
790 *
791 * remove unconfirmed.
792 *
793 * create an unconfirmed nfs4_client
794 * with same cl_name as existing confirmed nfs4_client,
795 * but with new callback info, new cl_clientid,
796 * new cl_verifier and a new cl_confirm
797 */
798 expire_client(unconf);
NeilBrowna55370a2005-06-23 22:03:52 -0700799 new = create_client(clname, dname);
800 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 goto out;
802 copy_verf(new,&clverifier);
803 new->cl_addr = ip_addr;
804 copy_cred(&new->cl_cred,&rqstp->rq_cred);
805 gen_clid(new);
806 gen_confirm(new);
807 gen_callback(new, setclid);
808 add_to_unconfirmed(new, strhashval);
809 } else {
810 /* No cases hit !!! */
811 status = nfserr_inval;
812 goto out;
813
814 }
815 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
816 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
817 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
818 status = nfs_ok;
819out:
820 nfs4_unlock_state();
821 return status;
822}
823
824
825/*
826 * RFC 3010 has a complex implmentation description of processing a
827 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
828 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
829 *
830 * NOTE: callback information will be processed here in a future patch
831 */
832int
833nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
834{
835 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
NeilBrown21ab45a2005-06-23 22:04:14 -0700836 struct nfs4_client *conf, *unconf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
838 clientid_t * clid = &setclientid_confirm->sc_clientid;
839 int status;
840
841 if (STALE_CLIENTID(clid))
842 return nfserr_stale_clientid;
843 /*
844 * XXX The Duplicate Request Cache (DRC) has been checked (??)
845 * We get here on a DRC miss.
846 */
847
848 nfs4_lock_state();
NeilBrown21ab45a2005-06-23 22:04:14 -0700849
850 conf = find_confirmed_client(clid);
851 unconf = find_unconfirmed_client(clid);
852
853 status = nfserr_clid_inuse;
854 if (conf && conf->cl_addr != ip_addr)
855 goto out;
856 if (unconf && unconf->cl_addr != ip_addr)
857 goto out;
858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 if ((conf && unconf) &&
860 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
861 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
NeilBrowna55370a2005-06-23 22:03:52 -0700862 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
NeilBrown7c79f732005-06-23 22:04:13 -0700864 /* CASE 1:
865 * unconf record that matches input clientid and input confirm.
866 * conf record that matches input clientid.
867 * conf and unconf records match names, verifiers
868 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
870 status = nfserr_clid_inuse;
871 else {
NeilBrown1a69c172005-06-23 22:04:08 -0700872 /* XXX: We just turn off callbacks until we can handle
873 * change request correctly. */
NeilBrowncb36d632005-06-23 22:04:23 -0700874 atomic_set(&conf->cl_callback.cb_set, 0);
NeilBrown21ab45a2005-06-23 22:04:14 -0700875 gen_confirm(conf);
NeilBrown46309022005-07-07 17:59:10 -0700876 nfsd4_remove_clid_dir(unconf);
NeilBrown1a69c172005-06-23 22:04:08 -0700877 expire_client(unconf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 status = nfs_ok;
NeilBrown1a69c172005-06-23 22:04:08 -0700879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 }
NeilBrown7c79f732005-06-23 22:04:13 -0700881 } else if ((conf && !unconf) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 ((conf && unconf) &&
883 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
NeilBrowna55370a2005-06-23 22:03:52 -0700884 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
NeilBrown7c79f732005-06-23 22:04:13 -0700885 /* CASE 2:
886 * conf record that matches input clientid.
887 * if unconf record matches input clientid, then
888 * unconf->cl_name or unconf->cl_verifier don't match the
889 * conf record.
890 */
NeilBrown21ab45a2005-06-23 22:04:14 -0700891 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 status = nfserr_clid_inuse;
NeilBrown21ab45a2005-06-23 22:04:14 -0700893 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 status = nfs_ok;
NeilBrown7c79f732005-06-23 22:04:13 -0700895 } else if (!conf && unconf
896 && cmp_verf(&unconf->cl_confirm, &confirm)) {
897 /* CASE 3:
898 * conf record not found.
899 * unconf record found.
900 * unconf->cl_confirm matches input confirm
901 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
903 status = nfserr_clid_inuse;
904 } else {
NeilBrown1a69c172005-06-23 22:04:08 -0700905 unsigned int hash =
906 clientstr_hashval(unconf->cl_recdir);
907 conf = find_confirmed_client_by_str(unconf->cl_recdir,
908 hash);
909 if (conf) {
NeilBrownc7b9a452005-06-23 22:04:30 -0700910 nfsd4_remove_clid_dir(conf);
NeilBrown1a69c172005-06-23 22:04:08 -0700911 expire_client(conf);
912 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 move_to_confirmed(unconf);
NeilBrown21ab45a2005-06-23 22:04:14 -0700914 conf = unconf;
NeilBrown1a69c172005-06-23 22:04:08 -0700915 status = nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 }
NeilBrown7c79f732005-06-23 22:04:13 -0700917 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
918 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
919 &confirm)))) {
920 /* CASE 4:
921 * conf record not found, or if conf, conf->cl_confirm does not
922 * match input confirm.
923 * unconf record not found, or if unconf, unconf->cl_confirm
924 * does not match input confirm.
925 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 status = nfserr_stale_clientid;
NeilBrown7c79f732005-06-23 22:04:13 -0700927 } else {
NeilBrown08e89872005-06-23 22:04:11 -0700928 /* check that we have hit one of the cases...*/
929 status = nfserr_clid_inuse;
930 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931out:
932 if (!status)
NeilBrown21ab45a2005-06-23 22:04:14 -0700933 nfsd4_probe_callback(conf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 nfs4_unlock_state();
935 return status;
936}
937
938/*
939 * Open owner state (share locks)
940 */
941
942/* hash tables for nfs4_stateowner */
943#define OWNER_HASH_BITS 8
944#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
945#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
946
947#define ownerid_hashval(id) \
948 ((id) & OWNER_HASH_MASK)
949#define ownerstr_hashval(clientid, ownername) \
950 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
951
952static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
953static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
954
955/* hash table for nfs4_file */
956#define FILE_HASH_BITS 8
957#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
958#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
959/* hash table for (open)nfs4_stateid */
960#define STATEID_HASH_BITS 10
961#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
962#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
963
964#define file_hashval(x) \
965 hash_ptr(x, FILE_HASH_BITS)
966#define stateid_hashval(owner_id, file_id) \
967 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
968
969static struct list_head file_hashtbl[FILE_HASH_SIZE];
970static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
971
972/* OPEN Share state helper functions */
973static inline struct nfs4_file *
974alloc_init_file(struct inode *ino)
975{
976 struct nfs4_file *fp;
977 unsigned int hashval = file_hashval(ino);
978
NeilBrowne60d4392005-06-23 22:03:01 -0700979 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
980 if (fp) {
NeilBrown13cd2182005-06-23 22:03:10 -0700981 kref_init(&fp->fi_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 INIT_LIST_HEAD(&fp->fi_hash);
NeilBrown8beefa22005-06-23 22:03:08 -0700983 INIT_LIST_HEAD(&fp->fi_stateids);
984 INIT_LIST_HEAD(&fp->fi_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
986 fp->fi_inode = igrab(ino);
987 fp->fi_id = current_fileid++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 return fp;
989 }
990 return NULL;
991}
992
993static void
NeilBrowne60d4392005-06-23 22:03:01 -0700994nfsd4_free_slab(kmem_cache_t **slab)
995{
996 int status;
997
998 if (*slab == NULL)
999 return;
1000 status = kmem_cache_destroy(*slab);
1001 *slab = NULL;
1002 WARN_ON(status);
1003}
1004
1005static void
1006nfsd4_free_slabs(void)
1007{
1008 nfsd4_free_slab(&stateowner_slab);
1009 nfsd4_free_slab(&file_slab);
NeilBrown5ac049a2005-06-23 22:03:03 -07001010 nfsd4_free_slab(&stateid_slab);
NeilBrown5b2d21c2005-06-23 22:03:04 -07001011 nfsd4_free_slab(&deleg_slab);
NeilBrowne60d4392005-06-23 22:03:01 -07001012}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
1014static int
1015nfsd4_init_slabs(void)
1016{
1017 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1018 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
NeilBrowne60d4392005-06-23 22:03:01 -07001019 if (stateowner_slab == NULL)
1020 goto out_nomem;
1021 file_slab = kmem_cache_create("nfsd4_files",
1022 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1023 if (file_slab == NULL)
1024 goto out_nomem;
NeilBrown5ac049a2005-06-23 22:03:03 -07001025 stateid_slab = kmem_cache_create("nfsd4_stateids",
1026 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1027 if (stateid_slab == NULL)
1028 goto out_nomem;
NeilBrown5b2d21c2005-06-23 22:03:04 -07001029 deleg_slab = kmem_cache_create("nfsd4_delegations",
1030 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1031 if (deleg_slab == NULL)
1032 goto out_nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 return 0;
NeilBrowne60d4392005-06-23 22:03:01 -07001034out_nomem:
1035 nfsd4_free_slabs();
1036 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1037 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038}
1039
1040void
1041nfs4_free_stateowner(struct kref *kref)
1042{
1043 struct nfs4_stateowner *sop =
1044 container_of(kref, struct nfs4_stateowner, so_ref);
1045 kfree(sop->so_owner.data);
1046 kmem_cache_free(stateowner_slab, sop);
1047}
1048
1049static inline struct nfs4_stateowner *
1050alloc_stateowner(struct xdr_netobj *owner)
1051{
1052 struct nfs4_stateowner *sop;
1053
1054 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1055 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1056 memcpy(sop->so_owner.data, owner->data, owner->len);
1057 sop->so_owner.len = owner->len;
1058 kref_init(&sop->so_ref);
1059 return sop;
1060 }
1061 kmem_cache_free(stateowner_slab, sop);
1062 }
1063 return NULL;
1064}
1065
1066static struct nfs4_stateowner *
1067alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1068 struct nfs4_stateowner *sop;
1069 struct nfs4_replay *rp;
1070 unsigned int idhashval;
1071
1072 if (!(sop = alloc_stateowner(&open->op_owner)))
1073 return NULL;
1074 idhashval = ownerid_hashval(current_ownerid);
1075 INIT_LIST_HEAD(&sop->so_idhash);
1076 INIT_LIST_HEAD(&sop->so_strhash);
1077 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07001078 INIT_LIST_HEAD(&sop->so_stateids);
1079 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 INIT_LIST_HEAD(&sop->so_close_lru);
1081 sop->so_time = 0;
1082 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1083 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07001084 list_add(&sop->so_perclient, &clp->cl_openowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 sop->so_is_open_owner = 1;
1086 sop->so_id = current_ownerid++;
1087 sop->so_client = clp;
1088 sop->so_seqid = open->op_seqid;
1089 sop->so_confirmed = 0;
1090 rp = &sop->so_replay;
Al Virode1ae282006-01-18 17:43:47 -08001091 rp->rp_status = nfserr_serverfault;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 rp->rp_buflen = 0;
1093 rp->rp_buf = rp->rp_ibuf;
1094 return sop;
1095}
1096
1097static void
1098release_stateid_lockowners(struct nfs4_stateid *open_stp)
1099{
1100 struct nfs4_stateowner *lock_sop;
1101
NeilBrownea1da632005-06-23 22:04:17 -07001102 while (!list_empty(&open_stp->st_lockowners)) {
1103 lock_sop = list_entry(open_stp->st_lockowners.next,
1104 struct nfs4_stateowner, so_perstateid);
1105 /* list_del(&open_stp->st_lockowners); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 BUG_ON(lock_sop->so_is_open_owner);
1107 release_stateowner(lock_sop);
1108 }
1109}
1110
1111static void
1112unhash_stateowner(struct nfs4_stateowner *sop)
1113{
1114 struct nfs4_stateid *stp;
1115
1116 list_del(&sop->so_idhash);
1117 list_del(&sop->so_strhash);
NeilBrown6fa305d2005-06-23 22:03:06 -07001118 if (sop->so_is_open_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 list_del(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07001120 list_del(&sop->so_perstateid);
1121 while (!list_empty(&sop->so_stateids)) {
1122 stp = list_entry(sop->so_stateids.next,
1123 struct nfs4_stateid, st_perstateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 if (sop->so_is_open_owner)
1125 release_stateid(stp, OPEN_STATE);
1126 else
1127 release_stateid(stp, LOCK_STATE);
1128 }
1129}
1130
1131static void
1132release_stateowner(struct nfs4_stateowner *sop)
1133{
1134 unhash_stateowner(sop);
1135 list_del(&sop->so_close_lru);
1136 nfs4_put_stateowner(sop);
1137}
1138
1139static inline void
1140init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1141 struct nfs4_stateowner *sop = open->op_stateowner;
1142 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1143
1144 INIT_LIST_HEAD(&stp->st_hash);
NeilBrownea1da632005-06-23 22:04:17 -07001145 INIT_LIST_HEAD(&stp->st_perstateowner);
1146 INIT_LIST_HEAD(&stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 INIT_LIST_HEAD(&stp->st_perfile);
1148 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
NeilBrownea1da632005-06-23 22:04:17 -07001149 list_add(&stp->st_perstateowner, &sop->so_stateids);
NeilBrown8beefa22005-06-23 22:03:08 -07001150 list_add(&stp->st_perfile, &fp->fi_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07001152 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 stp->st_file = fp;
1154 stp->st_stateid.si_boot = boot_time;
1155 stp->st_stateid.si_stateownerid = sop->so_id;
1156 stp->st_stateid.si_fileid = fp->fi_id;
1157 stp->st_stateid.si_generation = 0;
1158 stp->st_access_bmap = 0;
1159 stp->st_deny_bmap = 0;
1160 __set_bit(open->op_share_access, &stp->st_access_bmap);
1161 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
NeilBrown4c4cd222005-07-07 17:59:27 -07001162 stp->st_openstp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163}
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}
1182
NeilBrownfd39ca92005-06-23 22:04:03 -07001183static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184move_to_close_lru(struct nfs4_stateowner *sop)
1185{
1186 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1187
1188 unhash_stateowner(sop);
1189 list_add_tail(&sop->so_close_lru, &close_lru);
1190 sop->so_time = get_seconds();
1191}
1192
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193static int
1194cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1195 return ((sop->so_owner.len == owner->len) &&
1196 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1197 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1198}
1199
1200static struct nfs4_stateowner *
1201find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1202{
1203 struct nfs4_stateowner *so = NULL;
1204
1205 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1206 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1207 return so;
1208 }
1209 return NULL;
1210}
1211
1212/* search file_hashtbl[] for file */
1213static struct nfs4_file *
1214find_file(struct inode *ino)
1215{
1216 unsigned int hashval = file_hashval(ino);
1217 struct nfs4_file *fp;
1218
1219 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
NeilBrown13cd2182005-06-23 22:03:10 -07001220 if (fp->fi_inode == ino) {
1221 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 return fp;
NeilBrown13cd2182005-06-23 22:03:10 -07001223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 }
1225 return NULL;
1226}
1227
1228#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1229#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1230
NeilBrownfd39ca92005-06-23 22:04:03 -07001231static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232set_access(unsigned int *access, unsigned long bmap) {
1233 int i;
1234
1235 *access = 0;
1236 for (i = 1; i < 4; i++) {
1237 if (test_bit(i, &bmap))
1238 *access |= i;
1239 }
1240}
1241
NeilBrownfd39ca92005-06-23 22:04:03 -07001242static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243set_deny(unsigned int *deny, unsigned long bmap) {
1244 int i;
1245
1246 *deny = 0;
1247 for (i = 0; i < 4; i++) {
1248 if (test_bit(i, &bmap))
1249 *deny |= i ;
1250 }
1251}
1252
1253static int
1254test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1255 unsigned int access, deny;
1256
1257 set_access(&access, stp->st_access_bmap);
1258 set_deny(&deny, stp->st_deny_bmap);
1259 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1260 return 0;
1261 return 1;
1262}
1263
1264/*
1265 * Called to check deny when READ with all zero stateid or
1266 * WRITE with all zero or all one stateid
1267 */
NeilBrownfd39ca92005-06-23 22:04:03 -07001268static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1270{
1271 struct inode *ino = current_fh->fh_dentry->d_inode;
1272 struct nfs4_file *fp;
1273 struct nfs4_stateid *stp;
NeilBrown13cd2182005-06-23 22:03:10 -07001274 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275
1276 dprintk("NFSD: nfs4_share_conflict\n");
1277
1278 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07001279 if (!fp)
1280 return nfs_ok;
NeilBrownb7009492005-07-07 17:59:23 -07001281 ret = nfserr_locked;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 /* Search for conflicting share reservations */
NeilBrown13cd2182005-06-23 22:03:10 -07001283 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1284 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1285 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1286 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 }
NeilBrown13cd2182005-06-23 22:03:10 -07001288 ret = nfs_ok;
1289out:
1290 put_nfs4_file(fp);
1291 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292}
1293
1294static inline void
1295nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1296{
1297 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1298 put_write_access(filp->f_dentry->d_inode);
1299 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1300 }
1301}
1302
1303/*
1304 * Recall a delegation
1305 */
1306static int
1307do_recall(void *__dp)
1308{
1309 struct nfs4_delegation *dp = __dp;
1310
1311 daemonize("nfsv4-recall");
1312
1313 nfsd4_cb_recall(dp);
1314 return 0;
1315}
1316
1317/*
1318 * Spawn a thread to perform a recall on the delegation represented
1319 * by the lease (file_lock)
1320 *
1321 * Called from break_lease() with lock_kernel() held.
1322 * Note: we assume break_lease will only call this *once* for any given
1323 * lease.
1324 */
1325static
1326void nfsd_break_deleg_cb(struct file_lock *fl)
1327{
1328 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1329 struct task_struct *t;
1330
1331 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1332 if (!dp)
1333 return;
1334
1335 /* We're assuming the state code never drops its reference
1336 * without first removing the lease. Since we're in this lease
1337 * callback (and since the lease code is serialized by the kernel
1338 * lock) we know the server hasn't removed the lease yet, we know
1339 * it's safe to take a reference: */
1340 atomic_inc(&dp->dl_count);
1341
1342 spin_lock(&recall_lock);
1343 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1344 spin_unlock(&recall_lock);
1345
1346 /* only place dl_time is set. protected by lock_kernel*/
1347 dp->dl_time = get_seconds();
1348
1349 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1350 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1351
1352 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1353 if (IS_ERR(t)) {
1354 struct nfs4_client *clp = dp->dl_client;
1355
1356 printk(KERN_INFO "NFSD: Callback thread failed for "
1357 "for client (clientid %08x/%08x)\n",
1358 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1359 nfs4_put_delegation(dp);
1360 }
1361}
1362
1363/*
1364 * The file_lock is being reapd.
1365 *
1366 * Called by locks_free_lock() with lock_kernel() held.
1367 */
1368static
1369void nfsd_release_deleg_cb(struct file_lock *fl)
1370{
1371 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1372
1373 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1374
1375 if (!(fl->fl_flags & FL_LEASE) || !dp)
1376 return;
1377 dp->dl_flock = NULL;
1378}
1379
1380/*
1381 * Set the delegation file_lock back pointer.
1382 *
1383 * Called from __setlease() with lock_kernel() held.
1384 */
1385static
1386void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1387{
1388 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1389
1390 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1391 if (!dp)
1392 return;
1393 dp->dl_flock = new;
1394}
1395
1396/*
1397 * Called from __setlease() with lock_kernel() held
1398 */
1399static
1400int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1401{
1402 struct nfs4_delegation *onlistd =
1403 (struct nfs4_delegation *)onlist->fl_owner;
1404 struct nfs4_delegation *tryd =
1405 (struct nfs4_delegation *)try->fl_owner;
1406
1407 if (onlist->fl_lmops != try->fl_lmops)
1408 return 0;
1409
1410 return onlistd->dl_client == tryd->dl_client;
1411}
1412
1413
1414static
1415int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1416{
1417 if (arg & F_UNLCK)
1418 return lease_modify(onlist, arg);
1419 else
1420 return -EAGAIN;
1421}
1422
NeilBrownfd39ca92005-06-23 22:04:03 -07001423static struct lock_manager_operations nfsd_lease_mng_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 .fl_break = nfsd_break_deleg_cb,
1425 .fl_release_private = nfsd_release_deleg_cb,
1426 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1427 .fl_mylease = nfsd_same_client_deleg_cb,
1428 .fl_change = nfsd_change_deleg_cb,
1429};
1430
1431
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432int
1433nfsd4_process_open1(struct nfsd4_open *open)
1434{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 clientid_t *clientid = &open->op_clientid;
1436 struct nfs4_client *clp = NULL;
1437 unsigned int strhashval;
1438 struct nfs4_stateowner *sop = NULL;
1439
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 if (!check_name(open->op_owner))
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001441 return nfserr_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442
1443 if (STALE_CLIENTID(&open->op_clientid))
1444 return nfserr_stale_clientid;
1445
1446 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1447 sop = find_openstateowner_str(strhashval, open);
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001448 open->op_stateowner = sop;
1449 if (!sop) {
1450 /* Make sure the client's lease hasn't expired. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 clp = find_confirmed_client(clientid);
1452 if (clp == NULL)
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001453 return nfserr_expired;
1454 goto renew;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 }
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001456 if (!sop->so_confirmed) {
1457 /* Replace unconfirmed owners without checking for replay. */
1458 clp = sop->so_client;
1459 release_stateowner(sop);
1460 open->op_stateowner = NULL;
1461 goto renew;
1462 }
1463 if (open->op_seqid == sop->so_seqid - 1) {
1464 if (sop->so_replay.rp_buflen)
1465 return NFSERR_REPLAY_ME;
1466 /* The original OPEN failed so spectacularly
1467 * that we don't even have replay data saved!
1468 * Therefore, we have no choice but to continue
1469 * processing this OPEN; presumably, we'll
1470 * fail again for the same reason.
1471 */
1472 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1473 goto renew;
1474 }
1475 if (open->op_seqid != sop->so_seqid)
1476 return nfserr_bad_seqid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477renew:
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001478 if (open->op_stateowner == NULL) {
1479 sop = alloc_init_open_stateowner(strhashval, clp, open);
1480 if (sop == NULL)
1481 return nfserr_resource;
1482 open->op_stateowner = sop;
1483 }
1484 list_del_init(&sop->so_close_lru);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 renew_client(sop->so_client);
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001486 return nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487}
1488
NeilBrown4a6e43e2005-06-23 22:02:50 -07001489static inline int
1490nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1491{
1492 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1493 return nfserr_openmode;
1494 else
1495 return nfs_ok;
1496}
1497
NeilBrown52f4fb42005-06-23 22:02:49 -07001498static struct nfs4_delegation *
1499find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1500{
1501 struct nfs4_delegation *dp;
1502
NeilBrownea1da632005-06-23 22:04:17 -07001503 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
NeilBrown52f4fb42005-06-23 22:02:49 -07001504 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1505 return dp;
1506 }
1507 return NULL;
1508}
1509
NeilBrownc44c5ee2005-06-23 22:02:54 -07001510static int
NeilBrown567d9822005-06-23 22:02:53 -07001511nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1512 struct nfs4_delegation **dp)
1513{
1514 int flags;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001515 int status = nfserr_bad_stateid;
NeilBrown567d9822005-06-23 22:02:53 -07001516
1517 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1518 if (*dp == NULL)
NeilBrownc44c5ee2005-06-23 22:02:54 -07001519 goto out;
NeilBrown567d9822005-06-23 22:02:53 -07001520 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1521 RD_STATE : WR_STATE;
1522 status = nfs4_check_delegmode(*dp, flags);
1523 if (status)
1524 *dp = NULL;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001525out:
1526 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1527 return nfs_ok;
1528 if (status)
1529 return status;
1530 open->op_stateowner->so_confirmed = 1;
1531 return nfs_ok;
NeilBrown567d9822005-06-23 22:02:53 -07001532}
1533
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534static int
1535nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1536{
1537 struct nfs4_stateid *local;
1538 int status = nfserr_share_denied;
1539 struct nfs4_stateowner *sop = open->op_stateowner;
1540
NeilBrown8beefa22005-06-23 22:03:08 -07001541 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 /* ignore lock owners */
1543 if (local->st_stateowner->so_is_open_owner == 0)
1544 continue;
1545 /* remember if we have seen this open owner */
1546 if (local->st_stateowner == sop)
1547 *stpp = local;
1548 /* check for conflicting share reservations */
1549 if (!test_share(local, open))
1550 goto out;
1551 }
1552 status = 0;
1553out:
1554 return status;
1555}
1556
NeilBrown5ac049a2005-06-23 22:03:03 -07001557static inline struct nfs4_stateid *
1558nfs4_alloc_stateid(void)
1559{
1560 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1561}
1562
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563static int
1564nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
NeilBrown567d9822005-06-23 22:02:53 -07001565 struct nfs4_delegation *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 struct svc_fh *cur_fh, int flags)
1567{
1568 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569
NeilBrown5ac049a2005-06-23 22:03:03 -07001570 stp = nfs4_alloc_stateid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 if (stp == NULL)
1572 return nfserr_resource;
1573
NeilBrown567d9822005-06-23 22:02:53 -07001574 if (dp) {
1575 get_file(dp->dl_vfs_file);
1576 stp->st_vfs_file = dp->dl_vfs_file;
1577 } else {
1578 int status;
1579 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1580 &stp->st_vfs_file);
1581 if (status) {
1582 if (status == nfserr_dropit)
1583 status = nfserr_jukebox;
NeilBrown5ac049a2005-06-23 22:03:03 -07001584 kmem_cache_free(stateid_slab, stp);
NeilBrown567d9822005-06-23 22:02:53 -07001585 return status;
1586 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 *stpp = stp;
1589 return 0;
1590}
1591
1592static inline int
1593nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1594 struct nfsd4_open *open)
1595{
1596 struct iattr iattr = {
1597 .ia_valid = ATTR_SIZE,
1598 .ia_size = 0,
1599 };
1600 if (!open->op_truncate)
1601 return 0;
1602 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
Al Viro92465852006-01-18 17:43:46 -08001603 return nfserr_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1605}
1606
1607static int
1608nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1609{
1610 struct file *filp = stp->st_vfs_file;
1611 struct inode *inode = filp->f_dentry->d_inode;
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001612 unsigned int share_access, new_writer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 int status;
1614
1615 set_access(&share_access, stp->st_access_bmap);
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001616 new_writer = (~share_access) & open->op_share_access
1617 & NFS4_SHARE_ACCESS_WRITE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001619 if (new_writer) {
1620 status = get_write_access(inode);
1621 if (status)
1622 return nfserrno(status);
1623 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 status = nfsd4_truncate(rqstp, cur_fh, open);
1625 if (status) {
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001626 if (new_writer)
1627 put_write_access(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 return status;
1629 }
1630 /* remember the open */
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001631 filp->f_mode |= open->op_share_access;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 set_bit(open->op_share_access, &stp->st_access_bmap);
1633 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1634
1635 return nfs_ok;
1636}
1637
1638
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639static void
NeilBrown37515172005-07-07 17:59:16 -07001640nfs4_set_claim_prev(struct nfsd4_open *open)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641{
NeilBrown37515172005-07-07 17:59:16 -07001642 open->op_stateowner->so_confirmed = 1;
1643 open->op_stateowner->so_client->cl_firststate = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644}
1645
1646/*
1647 * Attempt to hand out a delegation.
1648 */
1649static void
1650nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1651{
1652 struct nfs4_delegation *dp;
1653 struct nfs4_stateowner *sop = stp->st_stateowner;
1654 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1655 struct file_lock fl, *flp = &fl;
1656 int status, flag = 0;
1657
1658 flag = NFS4_OPEN_DELEGATE_NONE;
NeilBrown7b190fe2005-06-23 22:03:23 -07001659 open->op_recall = 0;
1660 switch (open->op_claim_type) {
1661 case NFS4_OPEN_CLAIM_PREVIOUS:
1662 if (!atomic_read(&cb->cb_set))
1663 open->op_recall = 1;
1664 flag = open->op_delegate_type;
1665 if (flag == NFS4_OPEN_DELEGATE_NONE)
1666 goto out;
1667 break;
1668 case NFS4_OPEN_CLAIM_NULL:
1669 /* Let's not give out any delegations till everyone's
1670 * had the chance to reclaim theirs.... */
1671 if (nfs4_in_grace())
1672 goto out;
1673 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1674 goto out;
1675 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1676 flag = NFS4_OPEN_DELEGATE_WRITE;
1677 else
1678 flag = NFS4_OPEN_DELEGATE_READ;
1679 break;
1680 default:
1681 goto out;
1682 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683
1684 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1685 if (dp == NULL) {
1686 flag = NFS4_OPEN_DELEGATE_NONE;
1687 goto out;
1688 }
1689 locks_init_lock(&fl);
1690 fl.fl_lmops = &nfsd_lease_mng_ops;
1691 fl.fl_flags = FL_LEASE;
1692 fl.fl_end = OFFSET_MAX;
1693 fl.fl_owner = (fl_owner_t)dp;
1694 fl.fl_file = stp->st_vfs_file;
1695 fl.fl_pid = current->tgid;
1696
1697 /* setlease checks to see if delegation should be handed out.
1698 * the lock_manager callbacks fl_mylease and fl_change are used
1699 */
1700 if ((status = setlease(stp->st_vfs_file,
1701 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1702 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
NeilBrownc9071322005-04-16 15:26:38 -07001703 unhash_delegation(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 flag = NFS4_OPEN_DELEGATE_NONE;
1705 goto out;
1706 }
1707
1708 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1709
1710 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1711 dp->dl_stateid.si_boot,
1712 dp->dl_stateid.si_stateownerid,
1713 dp->dl_stateid.si_fileid,
1714 dp->dl_stateid.si_generation);
1715out:
NeilBrown7b190fe2005-06-23 22:03:23 -07001716 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1717 && flag == NFS4_OPEN_DELEGATE_NONE
1718 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1719 printk("NFSD: WARNING: refusing delegation reclaim\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 open->op_delegate_type = flag;
1721}
1722
1723/*
1724 * called with nfs4_lock_state() held.
1725 */
1726int
1727nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1728{
1729 struct nfs4_file *fp = NULL;
1730 struct inode *ino = current_fh->fh_dentry->d_inode;
1731 struct nfs4_stateid *stp = NULL;
NeilBrown567d9822005-06-23 22:02:53 -07001732 struct nfs4_delegation *dp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 int status;
1734
1735 status = nfserr_inval;
1736 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1737 goto out;
1738 /*
1739 * Lookup file; if found, lookup stateid and check open request,
1740 * and check for delegations in the process of being recalled.
1741 * If not found, create the nfs4_file struct
1742 */
1743 fp = find_file(ino);
1744 if (fp) {
1745 if ((status = nfs4_check_open(fp, open, &stp)))
1746 goto out;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001747 status = nfs4_check_deleg(fp, open, &dp);
1748 if (status)
1749 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 } else {
NeilBrownc44c5ee2005-06-23 22:02:54 -07001751 status = nfserr_bad_stateid;
1752 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1753 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 status = nfserr_resource;
1755 fp = alloc_init_file(ino);
1756 if (fp == NULL)
1757 goto out;
1758 }
1759
1760 /*
1761 * OPEN the file, or upgrade an existing OPEN.
1762 * If truncate fails, the OPEN fails.
1763 */
1764 if (stp) {
1765 /* Stateid was found, this is an OPEN upgrade */
1766 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1767 if (status)
1768 goto out;
NeilBrown444c2c02005-07-07 17:59:22 -07001769 update_stateid(&stp->st_stateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 } else {
1771 /* Stateid was not found, this is a new OPEN */
1772 int flags = 0;
1773 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1774 flags = MAY_WRITE;
1775 else
1776 flags = MAY_READ;
NeilBrown567d9822005-06-23 22:02:53 -07001777 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1778 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779 goto out;
1780 init_stateid(stp, fp, open);
1781 status = nfsd4_truncate(rqstp, current_fh, open);
1782 if (status) {
1783 release_stateid(stp, OPEN_STATE);
1784 goto out;
1785 }
1786 }
1787 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1788
1789 /*
1790 * Attempt to hand out a delegation. No error return, because the
1791 * OPEN succeeds even if we fail.
1792 */
1793 nfs4_open_delegation(current_fh, open, stp);
1794
1795 status = nfs_ok;
1796
1797 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1798 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1799 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1800out:
NeilBrown13cd2182005-06-23 22:03:10 -07001801 if (fp)
1802 put_nfs4_file(fp);
NeilBrown37515172005-07-07 17:59:16 -07001803 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1804 nfs4_set_claim_prev(open);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 /*
1806 * To finish the open response, we just need to set the rflags.
1807 */
1808 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1809 if (!open->op_stateowner->so_confirmed)
1810 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1811
1812 return status;
1813}
1814
NeilBrown58da2822005-06-23 22:03:19 -07001815static struct workqueue_struct *laundry_wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816static struct work_struct laundromat_work;
1817static void laundromat_main(void *);
1818static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1819
1820int
1821nfsd4_renew(clientid_t *clid)
1822{
1823 struct nfs4_client *clp;
1824 int status;
1825
1826 nfs4_lock_state();
1827 dprintk("process_renew(%08x/%08x): starting\n",
1828 clid->cl_boot, clid->cl_id);
1829 status = nfserr_stale_clientid;
1830 if (STALE_CLIENTID(clid))
1831 goto out;
1832 clp = find_confirmed_client(clid);
1833 status = nfserr_expired;
1834 if (clp == NULL) {
1835 /* We assume the client took too long to RENEW. */
1836 dprintk("nfsd4_renew: clientid not found!\n");
1837 goto out;
1838 }
1839 renew_client(clp);
1840 status = nfserr_cb_path_down;
NeilBrownea1da632005-06-23 22:04:17 -07001841 if (!list_empty(&clp->cl_delegations)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 && !atomic_read(&clp->cl_callback.cb_set))
1843 goto out;
1844 status = nfs_ok;
1845out:
1846 nfs4_unlock_state();
1847 return status;
1848}
1849
NeilBrowna76b4312005-06-23 22:04:01 -07001850static void
1851end_grace(void)
1852{
1853 dprintk("NFSD: end of grace period\n");
NeilBrownc7b9a452005-06-23 22:04:30 -07001854 nfsd4_recdir_purge_old();
NeilBrowna76b4312005-06-23 22:04:01 -07001855 in_grace = 0;
1856}
1857
NeilBrownfd39ca92005-06-23 22:04:03 -07001858static time_t
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859nfs4_laundromat(void)
1860{
1861 struct nfs4_client *clp;
1862 struct nfs4_stateowner *sop;
1863 struct nfs4_delegation *dp;
1864 struct list_head *pos, *next, reaplist;
1865 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1866 time_t t, clientid_val = NFSD_LEASE_TIME;
1867 time_t u, test_val = NFSD_LEASE_TIME;
1868
1869 nfs4_lock_state();
1870
1871 dprintk("NFSD: laundromat service - starting\n");
NeilBrowna76b4312005-06-23 22:04:01 -07001872 if (in_grace)
1873 end_grace();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 list_for_each_safe(pos, next, &client_lru) {
1875 clp = list_entry(pos, struct nfs4_client, cl_lru);
1876 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1877 t = clp->cl_time - cutoff;
1878 if (clientid_val > t)
1879 clientid_val = t;
1880 break;
1881 }
1882 dprintk("NFSD: purging unused client (clientid %08x)\n",
1883 clp->cl_clientid.cl_id);
NeilBrownc7b9a452005-06-23 22:04:30 -07001884 nfsd4_remove_clid_dir(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 expire_client(clp);
1886 }
1887 INIT_LIST_HEAD(&reaplist);
1888 spin_lock(&recall_lock);
1889 list_for_each_safe(pos, next, &del_recall_lru) {
1890 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1891 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1892 u = dp->dl_time - cutoff;
1893 if (test_val > u)
1894 test_val = u;
1895 break;
1896 }
1897 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1898 dp, dp->dl_flock);
1899 list_move(&dp->dl_recall_lru, &reaplist);
1900 }
1901 spin_unlock(&recall_lock);
1902 list_for_each_safe(pos, next, &reaplist) {
1903 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1904 list_del_init(&dp->dl_recall_lru);
1905 unhash_delegation(dp);
1906 }
1907 test_val = NFSD_LEASE_TIME;
1908 list_for_each_safe(pos, next, &close_lru) {
1909 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1910 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1911 u = sop->so_time - cutoff;
1912 if (test_val > u)
1913 test_val = u;
1914 break;
1915 }
1916 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1917 sop->so_id);
1918 list_del(&sop->so_close_lru);
1919 nfs4_put_stateowner(sop);
1920 }
1921 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1922 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1923 nfs4_unlock_state();
1924 return clientid_val;
1925}
1926
1927void
1928laundromat_main(void *not_used)
1929{
1930 time_t t;
1931
1932 t = nfs4_laundromat();
1933 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
NeilBrown58da2822005-06-23 22:03:19 -07001934 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935}
1936
NeilBrownfd39ca92005-06-23 22:04:03 -07001937static struct nfs4_stateowner *
NeilBrownf8816512005-07-07 17:59:25 -07001938search_close_lru(u32 st_id, int flags)
1939{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 struct nfs4_stateowner *local = NULL;
1941
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 if (flags & CLOSE_STATE) {
1943 list_for_each_entry(local, &close_lru, so_close_lru) {
1944 if (local->so_id == st_id)
1945 return local;
1946 }
1947 }
1948 return NULL;
1949}
1950
1951static inline int
1952nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1953{
1954 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1955}
1956
1957static int
1958STALE_STATEID(stateid_t *stateid)
1959{
1960 if (stateid->si_boot == boot_time)
1961 return 0;
Neil Brown849823c2005-09-13 01:25:36 -07001962 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1964 stateid->si_generation);
1965 return 1;
1966}
1967
1968static inline int
1969access_permit_read(unsigned long access_bmap)
1970{
1971 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1972 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1973 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1974}
1975
1976static inline int
1977access_permit_write(unsigned long access_bmap)
1978{
1979 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1980 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1981}
1982
1983static
1984int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1985{
1986 int status = nfserr_openmode;
1987
1988 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1989 goto out;
1990 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1991 goto out;
1992 status = nfs_ok;
1993out:
1994 return status;
1995}
1996
1997static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1999{
2000 /* Trying to call delegreturn with a special stateid? Yuch: */
2001 if (!(flags & (RD_STATE | WR_STATE)))
2002 return nfserr_bad_stateid;
2003 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2004 return nfs_ok;
2005 else if (nfs4_in_grace()) {
2006 /* Answer in remaining cases depends on existance of
2007 * conflicting state; so we must wait out the grace period. */
2008 return nfserr_grace;
2009 } else if (flags & WR_STATE)
2010 return nfs4_share_conflict(current_fh,
2011 NFS4_SHARE_DENY_WRITE);
2012 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2013 return nfs4_share_conflict(current_fh,
2014 NFS4_SHARE_DENY_READ);
2015}
2016
2017/*
2018 * Allow READ/WRITE during grace period on recovered state only for files
2019 * that are not able to provide mandatory locking.
2020 */
2021static inline int
2022io_during_grace_disallowed(struct inode *inode, int flags)
2023{
2024 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2025 && MANDATORY_LOCK(inode);
2026}
2027
2028/*
2029* Checks for stateid operations
2030*/
2031int
2032nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2033{
2034 struct nfs4_stateid *stp = NULL;
2035 struct nfs4_delegation *dp = NULL;
2036 stateid_t *stidp;
2037 struct inode *ino = current_fh->fh_dentry->d_inode;
2038 int status;
2039
2040 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2041 stateid->si_boot, stateid->si_stateownerid,
2042 stateid->si_fileid, stateid->si_generation);
2043 if (filpp)
2044 *filpp = NULL;
2045
2046 if (io_during_grace_disallowed(ino, flags))
2047 return nfserr_grace;
2048
2049 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2050 return check_special_stateids(current_fh, stateid, flags);
2051
2052 /* STALE STATEID */
2053 status = nfserr_stale_stateid;
2054 if (STALE_STATEID(stateid))
2055 goto out;
2056
2057 /* BAD STATEID */
2058 status = nfserr_bad_stateid;
2059 if (!stateid->si_fileid) { /* delegation stateid */
2060 if(!(dp = find_delegation_stateid(ino, stateid))) {
2061 dprintk("NFSD: delegation stateid not found\n");
2062 if (nfs4_in_grace())
2063 status = nfserr_grace;
2064 goto out;
2065 }
2066 stidp = &dp->dl_stateid;
2067 } else { /* open or lock stateid */
2068 if (!(stp = find_stateid(stateid, flags))) {
2069 dprintk("NFSD: open or lock stateid not found\n");
2070 if (nfs4_in_grace())
2071 status = nfserr_grace;
2072 goto out;
2073 }
2074 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2075 goto out;
2076 if (!stp->st_stateowner->so_confirmed)
2077 goto out;
2078 stidp = &stp->st_stateid;
2079 }
2080 if (stateid->si_generation > stidp->si_generation)
2081 goto out;
2082
2083 /* OLD STATEID */
2084 status = nfserr_old_stateid;
2085 if (stateid->si_generation < stidp->si_generation)
2086 goto out;
2087 if (stp) {
2088 if ((status = nfs4_check_openmode(stp,flags)))
2089 goto out;
2090 renew_client(stp->st_stateowner->so_client);
2091 if (filpp)
2092 *filpp = stp->st_vfs_file;
2093 } else if (dp) {
2094 if ((status = nfs4_check_delegmode(dp, flags)))
2095 goto out;
2096 renew_client(dp->dl_client);
2097 if (flags & DELEG_RET)
2098 unhash_delegation(dp);
2099 if (filpp)
2100 *filpp = dp->dl_vfs_file;
2101 }
2102 status = nfs_ok;
2103out:
2104 return status;
2105}
2106
NeilBrown4c4cd222005-07-07 17:59:27 -07002107static inline int
2108setlkflg (int type)
2109{
2110 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2111 RD_STATE : WR_STATE;
2112}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113
2114/*
2115 * Checks for sequence id mutating operations.
2116 */
NeilBrownfd39ca92005-06-23 22:04:03 -07002117static int
NeilBrown4c4cd222005-07-07 17:59:27 -07002118nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120 struct nfs4_stateid *stp;
2121 struct nfs4_stateowner *sop;
2122
2123 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2124 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2125 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2126 stateid->si_generation);
NeilBrown3a4f98b2005-07-07 17:59:26 -07002127
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 *stpp = NULL;
2129 *sopp = NULL;
2130
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2132 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
NeilBrown3a4f98b2005-07-07 17:59:26 -07002133 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 }
2135
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136 if (STALE_STATEID(stateid))
NeilBrown3a4f98b2005-07-07 17:59:26 -07002137 return nfserr_stale_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 /*
2139 * We return BAD_STATEID if filehandle doesn't match stateid,
2140 * the confirmed flag is incorrecly set, or the generation
2141 * number is incorrect.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 */
NeilBrownf8816512005-07-07 17:59:25 -07002143 stp = find_stateid(stateid, flags);
2144 if (stp == NULL) {
2145 /*
2146 * Also, we should make sure this isn't just the result of
2147 * a replayed close:
2148 */
2149 sop = search_close_lru(stateid->si_stateownerid, flags);
2150 if (sop == NULL)
2151 return nfserr_bad_stateid;
2152 *sopp = sop;
2153 goto check_replay;
2154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155
NeilBrown4c4cd222005-07-07 17:59:27 -07002156 if (lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 struct nfs4_stateowner *sop = stp->st_stateowner;
NeilBrown4c4cd222005-07-07 17:59:27 -07002158 clientid_t *lockclid = &lock->v.new.clientid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 struct nfs4_client *clp = sop->so_client;
NeilBrown4c4cd222005-07-07 17:59:27 -07002160 int lkflg = 0;
2161 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162
NeilBrown4c4cd222005-07-07 17:59:27 -07002163 lkflg = setlkflg(lock->lk_type);
2164
2165 if (lock->lk_is_new) {
2166 if (!sop->so_is_open_owner)
2167 return nfserr_bad_stateid;
2168 if (!cmp_clid(&clp->cl_clientid, lockclid))
2169 return nfserr_bad_stateid;
2170 /* stp is the open stateid */
2171 status = nfs4_check_openmode(stp, lkflg);
2172 if (status)
2173 return status;
2174 } else {
2175 /* stp is the lock stateid */
2176 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2177 if (status)
2178 return status;
2179 }
2180
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 }
2182
2183 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2184 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
NeilBrown3a4f98b2005-07-07 17:59:26 -07002185 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 }
2187
2188 *stpp = stp;
2189 *sopp = sop = stp->st_stateowner;
2190
2191 /*
2192 * We now validate the seqid and stateid generation numbers.
2193 * For the moment, we ignore the possibility of
2194 * generation number wraparound.
2195 */
NeilBrownbd9aac52005-07-07 17:59:19 -07002196 if (seqid != sop->so_seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197 goto check_replay;
2198
NeilBrown3a4f98b2005-07-07 17:59:26 -07002199 if (sop->so_confirmed && flags & CONFIRM) {
2200 printk("NFSD: preprocess_seqid_op: expected"
2201 " unconfirmed stateowner!\n");
2202 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 }
NeilBrown3a4f98b2005-07-07 17:59:26 -07002204 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2205 printk("NFSD: preprocess_seqid_op: stateowner not"
2206 " confirmed yet!\n");
2207 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 }
2209 if (stateid->si_generation > stp->st_stateid.si_generation) {
2210 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
NeilBrown3a4f98b2005-07-07 17:59:26 -07002211 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212 }
2213
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 if (stateid->si_generation < stp->st_stateid.si_generation) {
2215 printk("NFSD: preprocess_seqid_op: old stateid!\n");
NeilBrown3a4f98b2005-07-07 17:59:26 -07002216 return nfserr_old_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 }
NeilBrown52fd0042005-07-07 17:59:24 -07002218 renew_client(sop->so_client);
NeilBrown3a4f98b2005-07-07 17:59:26 -07002219 return nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221check_replay:
NeilBrownbd9aac52005-07-07 17:59:19 -07002222 if (seqid == sop->so_seqid - 1) {
Neil Brown849823c2005-09-13 01:25:36 -07002223 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 /* indicate replay to calling function */
NeilBrown3a4f98b2005-07-07 17:59:26 -07002225 return NFSERR_REPLAY_ME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 }
NeilBrown3a4f98b2005-07-07 17:59:26 -07002227 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2228 sop->so_seqid, seqid);
2229 *sopp = NULL;
2230 return nfserr_bad_seqid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231}
2232
2233int
Neil Brownf2327d92005-09-13 01:25:37 -07002234nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235{
2236 int status;
2237 struct nfs4_stateowner *sop;
2238 struct nfs4_stateid *stp;
2239
2240 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2241 (int)current_fh->fh_dentry->d_name.len,
2242 current_fh->fh_dentry->d_name.name);
2243
2244 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2245 goto out;
2246
2247 nfs4_lock_state();
2248
2249 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2250 &oc->oc_req_stateid,
2251 CHECK_FH | CONFIRM | OPEN_STATE,
2252 &oc->oc_stateowner, &stp, NULL)))
2253 goto out;
2254
2255 sop = oc->oc_stateowner;
2256 sop->so_confirmed = 1;
2257 update_stateid(&stp->st_stateid);
2258 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2259 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2260 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2261 stp->st_stateid.si_boot,
2262 stp->st_stateid.si_stateownerid,
2263 stp->st_stateid.si_fileid,
2264 stp->st_stateid.si_generation);
NeilBrownc7b9a452005-06-23 22:04:30 -07002265
2266 nfsd4_create_clid_dir(sop->so_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267out:
Neil Brownf2327d92005-09-13 01:25:37 -07002268 if (oc->oc_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 nfs4_get_stateowner(oc->oc_stateowner);
Neil Brownf2327d92005-09-13 01:25:37 -07002270 *replay_owner = oc->oc_stateowner;
2271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272 nfs4_unlock_state();
2273 return status;
2274}
2275
2276
2277/*
2278 * unset all bits in union bitmap (bmap) that
2279 * do not exist in share (from successful OPEN_DOWNGRADE)
2280 */
2281static void
2282reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2283{
2284 int i;
2285 for (i = 1; i < 4; i++) {
2286 if ((i & access) != i)
2287 __clear_bit(i, bmap);
2288 }
2289}
2290
2291static void
2292reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2293{
2294 int i;
2295 for (i = 0; i < 4; i++) {
2296 if ((i & deny) != i)
2297 __clear_bit(i, bmap);
2298 }
2299}
2300
2301int
Neil Brownf2327d92005-09-13 01:25:37 -07002302nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303{
2304 int status;
2305 struct nfs4_stateid *stp;
2306 unsigned int share_access;
2307
2308 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2309 (int)current_fh->fh_dentry->d_name.len,
2310 current_fh->fh_dentry->d_name.name);
2311
2312 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2313 return nfserr_inval;
2314
2315 nfs4_lock_state();
2316 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2317 &od->od_stateid,
2318 CHECK_FH | OPEN_STATE,
2319 &od->od_stateowner, &stp, NULL)))
2320 goto out;
2321
2322 status = nfserr_inval;
2323 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2324 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2325 stp->st_access_bmap, od->od_share_access);
2326 goto out;
2327 }
2328 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2329 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2330 stp->st_deny_bmap, od->od_share_deny);
2331 goto out;
2332 }
2333 set_access(&share_access, stp->st_access_bmap);
2334 nfs4_file_downgrade(stp->st_vfs_file,
2335 share_access & ~od->od_share_access);
2336
2337 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2338 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2339
2340 update_stateid(&stp->st_stateid);
2341 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2342 status = nfs_ok;
2343out:
Neil Brownf2327d92005-09-13 01:25:37 -07002344 if (od->od_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 nfs4_get_stateowner(od->od_stateowner);
Neil Brownf2327d92005-09-13 01:25:37 -07002346 *replay_owner = od->od_stateowner;
2347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 nfs4_unlock_state();
2349 return status;
2350}
2351
2352/*
2353 * nfs4_unlock_state() called after encode
2354 */
2355int
Neil Brownf2327d92005-09-13 01:25:37 -07002356nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357{
2358 int status;
2359 struct nfs4_stateid *stp;
2360
2361 dprintk("NFSD: nfsd4_close on file %.*s\n",
2362 (int)current_fh->fh_dentry->d_name.len,
2363 current_fh->fh_dentry->d_name.name);
2364
2365 nfs4_lock_state();
2366 /* check close_lru for replay */
2367 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2368 &close->cl_stateid,
2369 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2370 &close->cl_stateowner, &stp, NULL)))
2371 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372 status = nfs_ok;
2373 update_stateid(&stp->st_stateid);
2374 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2375
J. Bruce Fields04ef5952006-01-18 17:43:21 -08002376 /* release_stateid() calls nfsd_close() if needed */
2377 release_stateid(stp, OPEN_STATE);
2378
2379 /* place unused nfs4_stateowners on so_close_lru list to be
2380 * released by the laundromat service after the lease period
2381 * to enable us to handle CLOSE replay
2382 */
2383 if (list_empty(&close->cl_stateowner->so_stateids))
2384 move_to_close_lru(close->cl_stateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385out:
Neil Brownf2327d92005-09-13 01:25:37 -07002386 if (close->cl_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 nfs4_get_stateowner(close->cl_stateowner);
Neil Brownf2327d92005-09-13 01:25:37 -07002388 *replay_owner = close->cl_stateowner;
2389 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 nfs4_unlock_state();
2391 return status;
2392}
2393
2394int
2395nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2396{
2397 int status;
2398
2399 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2400 goto out;
2401
2402 nfs4_lock_state();
2403 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2404 nfs4_unlock_state();
2405out:
2406 return status;
2407}
2408
2409
2410/*
2411 * Lock owner state (byte-range locks)
2412 */
2413#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2414#define LOCK_HASH_BITS 8
2415#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2416#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2417
2418#define lockownerid_hashval(id) \
2419 ((id) & LOCK_HASH_MASK)
2420
2421static inline unsigned int
2422lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2423 struct xdr_netobj *ownername)
2424{
2425 return (file_hashval(inode) + cl_id
2426 + opaque_hashval(ownername->data, ownername->len))
2427 & LOCK_HASH_MASK;
2428}
2429
2430static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2431static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2432static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2433
NeilBrownfd39ca92005-06-23 22:04:03 -07002434static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435find_stateid(stateid_t *stid, int flags)
2436{
2437 struct nfs4_stateid *local = NULL;
2438 u32 st_id = stid->si_stateownerid;
2439 u32 f_id = stid->si_fileid;
2440 unsigned int hashval;
2441
2442 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2443 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2444 hashval = stateid_hashval(st_id, f_id);
2445 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2446 if ((local->st_stateid.si_stateownerid == st_id) &&
2447 (local->st_stateid.si_fileid == f_id))
2448 return local;
2449 }
2450 }
2451 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2452 hashval = stateid_hashval(st_id, f_id);
2453 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2454 if ((local->st_stateid.si_stateownerid == st_id) &&
2455 (local->st_stateid.si_fileid == f_id))
2456 return local;
2457 }
Neil Brown849823c2005-09-13 01:25:36 -07002458 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002459 return NULL;
2460}
2461
2462static struct nfs4_delegation *
2463find_delegation_stateid(struct inode *ino, stateid_t *stid)
2464{
NeilBrown13cd2182005-06-23 22:03:10 -07002465 struct nfs4_file *fp;
2466 struct nfs4_delegation *dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467
2468 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2469 stid->si_boot, stid->si_stateownerid,
2470 stid->si_fileid, stid->si_generation);
2471
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07002473 if (!fp)
2474 return NULL;
2475 dl = find_delegation_file(fp, stid);
2476 put_nfs4_file(fp);
2477 return dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478}
2479
2480/*
2481 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2482 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2483 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2484 * locking, this prevents us from being completely protocol-compliant. The
2485 * real solution to this problem is to start using unsigned file offsets in
2486 * the VFS, but this is a very deep change!
2487 */
2488static inline void
2489nfs4_transform_lock_offset(struct file_lock *lock)
2490{
2491 if (lock->fl_start < 0)
2492 lock->fl_start = OFFSET_MAX;
2493 if (lock->fl_end < 0)
2494 lock->fl_end = OFFSET_MAX;
2495}
2496
NeilBrownfd39ca92005-06-23 22:04:03 -07002497static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2499{
2500 struct nfs4_stateowner *local = NULL;
2501 int status = 0;
2502
2503 if (hashval >= LOCK_HASH_SIZE)
2504 goto out;
2505 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2506 if (local == sop) {
2507 status = 1;
2508 goto out;
2509 }
2510 }
2511out:
2512 return status;
2513}
2514
2515
2516static inline void
2517nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2518{
2519 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2520 unsigned int hval = lockownerid_hashval(sop->so_id);
2521
2522 deny->ld_sop = NULL;
2523 if (nfs4_verify_lock_stateowner(sop, hval)) {
2524 kref_get(&sop->so_ref);
2525 deny->ld_sop = sop;
2526 deny->ld_clientid = sop->so_client->cl_clientid;
2527 }
2528 deny->ld_start = fl->fl_start;
2529 deny->ld_length = ~(u64)0;
2530 if (fl->fl_end != ~(u64)0)
2531 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2532 deny->ld_type = NFS4_READ_LT;
2533 if (fl->fl_type != F_RDLCK)
2534 deny->ld_type = NFS4_WRITE_LT;
2535}
2536
2537static struct nfs4_stateowner *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2539 struct xdr_netobj *owner)
2540{
2541 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2542 struct nfs4_stateowner *op;
2543
2544 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2545 if (cmp_owner_str(op, owner, clid))
2546 return op;
2547 }
2548 return NULL;
2549}
2550
2551/*
2552 * Alloc a lock owner structure.
2553 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2554 * occured.
2555 *
2556 * strhashval = lock_ownerstr_hashval
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557 */
2558
2559static struct nfs4_stateowner *
2560alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2561 struct nfs4_stateowner *sop;
2562 struct nfs4_replay *rp;
2563 unsigned int idhashval;
2564
2565 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2566 return NULL;
2567 idhashval = lockownerid_hashval(current_ownerid);
2568 INIT_LIST_HEAD(&sop->so_idhash);
2569 INIT_LIST_HEAD(&sop->so_strhash);
2570 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07002571 INIT_LIST_HEAD(&sop->so_stateids);
2572 INIT_LIST_HEAD(&sop->so_perstateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2574 sop->so_time = 0;
2575 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2576 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07002577 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002578 sop->so_is_open_owner = 0;
2579 sop->so_id = current_ownerid++;
2580 sop->so_client = clp;
Neil Brownb59e3c02005-09-13 01:25:38 -07002581 /* It is the openowner seqid that will be incremented in encode in the
2582 * case of new lockowners; so increment the lock seqid manually: */
2583 sop->so_seqid = lock->lk_new_lock_seqid + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 sop->so_confirmed = 1;
2585 rp = &sop->so_replay;
Al Virode1ae282006-01-18 17:43:47 -08002586 rp->rp_status = nfserr_serverfault;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002587 rp->rp_buflen = 0;
2588 rp->rp_buf = rp->rp_ibuf;
2589 return sop;
2590}
2591
NeilBrownfd39ca92005-06-23 22:04:03 -07002592static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002593alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2594{
2595 struct nfs4_stateid *stp;
2596 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2597
NeilBrown5ac049a2005-06-23 22:03:03 -07002598 stp = nfs4_alloc_stateid();
2599 if (stp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600 goto out;
2601 INIT_LIST_HEAD(&stp->st_hash);
2602 INIT_LIST_HEAD(&stp->st_perfile);
NeilBrownea1da632005-06-23 22:04:17 -07002603 INIT_LIST_HEAD(&stp->st_perstateowner);
2604 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
NeilBrown8beefa22005-06-23 22:03:08 -07002606 list_add(&stp->st_perfile, &fp->fi_stateids);
NeilBrownea1da632005-06-23 22:04:17 -07002607 list_add(&stp->st_perstateowner, &sop->so_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002608 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07002609 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610 stp->st_file = fp;
2611 stp->st_stateid.si_boot = boot_time;
2612 stp->st_stateid.si_stateownerid = sop->so_id;
2613 stp->st_stateid.si_fileid = fp->fi_id;
2614 stp->st_stateid.si_generation = 0;
2615 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2616 stp->st_access_bmap = open_stp->st_access_bmap;
2617 stp->st_deny_bmap = open_stp->st_deny_bmap;
NeilBrown4c4cd222005-07-07 17:59:27 -07002618 stp->st_openstp = open_stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002619
2620out:
2621 return stp;
2622}
2623
NeilBrownfd39ca92005-06-23 22:04:03 -07002624static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625check_lock_length(u64 offset, u64 length)
2626{
2627 return ((length == 0) || ((length != ~(u64)0) &&
2628 LOFF_OVERFLOW(offset, length)));
2629}
2630
2631/*
2632 * LOCK operation
2633 */
2634int
Neil Brownf2327d92005-09-13 01:25:37 -07002635nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636{
NeilBrown3e9e3db2005-06-23 22:04:20 -07002637 struct nfs4_stateowner *open_sop = NULL;
Neil Brownb59e3c02005-09-13 01:25:38 -07002638 struct nfs4_stateowner *lock_sop = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639 struct nfs4_stateid *lock_stp;
2640 struct file *filp;
2641 struct file_lock file_lock;
2642 struct file_lock *conflock;
2643 int status = 0;
2644 unsigned int strhashval;
2645
2646 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2647 (long long) lock->lk_offset,
2648 (long long) lock->lk_length);
2649
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650 if (check_lock_length(lock->lk_offset, lock->lk_length))
2651 return nfserr_inval;
2652
Andy Adamsona6f6ef22006-01-18 17:43:17 -08002653 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2654 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2655 return status;
2656 }
2657
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658 nfs4_lock_state();
2659
2660 if (lock->lk_is_new) {
NeilBrown893f8772005-07-07 17:59:17 -07002661 /*
2662 * Client indicates that this is a new lockowner.
2663 * Use open owner and open stateid to create lock owner and
2664 * lock stateid.
2665 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 struct nfs4_stateid *open_stp = NULL;
2667 struct nfs4_file *fp;
2668
2669 status = nfserr_stale_clientid;
Neil Brown849823c2005-09-13 01:25:36 -07002670 if (STALE_CLIENTID(&lock->lk_new_clientid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 /* validate and update open stateid and open seqid */
2674 status = nfs4_preprocess_seqid_op(current_fh,
2675 lock->lk_new_open_seqid,
2676 &lock->lk_new_open_stateid,
2677 CHECK_FH | OPEN_STATE,
J. Bruce Fields3a655882006-01-18 17:43:19 -08002678 &lock->lk_replay_owner, &open_stp,
Neil Brownb59e3c02005-09-13 01:25:38 -07002679 lock);
NeilBrown37515172005-07-07 17:59:16 -07002680 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681 goto out;
J. Bruce Fields3a655882006-01-18 17:43:19 -08002682 open_sop = lock->lk_replay_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 /* create lockowner and lock stateid */
2684 fp = open_stp->st_file;
2685 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2686 open_sop->so_client->cl_clientid.cl_id,
2687 &lock->v.new.owner);
NeilBrown3e9e3db2005-06-23 22:04:20 -07002688 /* XXX: Do we need to check for duplicate stateowners on
2689 * the same file, or should they just be allowed (and
2690 * create new stateids)? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691 status = nfserr_resource;
Neil Brownb59e3c02005-09-13 01:25:38 -07002692 lock_sop = alloc_init_lock_stateowner(strhashval,
2693 open_sop->so_client, open_stp, lock);
2694 if (lock_sop == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695 goto out;
Neil Brownb59e3c02005-09-13 01:25:38 -07002696 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
J. Bruce Fields8a280512006-01-18 17:43:18 -08002697 if (lock_stp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 } else {
2700 /* lock (lock owner + lock stateid) already exists */
2701 status = nfs4_preprocess_seqid_op(current_fh,
2702 lock->lk_old_lock_seqid,
2703 &lock->lk_old_lock_stateid,
2704 CHECK_FH | LOCK_STATE,
J. Bruce Fields3a655882006-01-18 17:43:19 -08002705 &lock->lk_replay_owner, &lock_stp, lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 if (status)
2707 goto out;
J. Bruce Fields3a655882006-01-18 17:43:19 -08002708 lock_sop = lock->lk_replay_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 }
J. Bruce Fields3a655882006-01-18 17:43:19 -08002710 /* lock->lk_replay_owner and lock_stp have been created or found */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711 filp = lock_stp->st_vfs_file;
2712
NeilBrown0dd395d2005-07-07 17:59:15 -07002713 status = nfserr_grace;
2714 if (nfs4_in_grace() && !lock->lk_reclaim)
2715 goto out;
2716 status = nfserr_no_grace;
2717 if (!nfs4_in_grace() && lock->lk_reclaim)
2718 goto out;
2719
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720 locks_init_lock(&file_lock);
2721 switch (lock->lk_type) {
2722 case NFS4_READ_LT:
2723 case NFS4_READW_LT:
2724 file_lock.fl_type = F_RDLCK;
2725 break;
2726 case NFS4_WRITE_LT:
2727 case NFS4_WRITEW_LT:
2728 file_lock.fl_type = F_WRLCK;
2729 break;
2730 default:
2731 status = nfserr_inval;
2732 goto out;
2733 }
Neil Brownb59e3c02005-09-13 01:25:38 -07002734 file_lock.fl_owner = (fl_owner_t)lock_sop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735 file_lock.fl_pid = current->tgid;
2736 file_lock.fl_file = filp;
2737 file_lock.fl_flags = FL_POSIX;
2738
2739 file_lock.fl_start = lock->lk_offset;
2740 if ((lock->lk_length == ~(u64)0) ||
2741 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2742 file_lock.fl_end = ~(u64)0;
2743 else
2744 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2745 nfs4_transform_lock_offset(&file_lock);
2746
2747 /*
2748 * Try to lock the file in the VFS.
2749 * Note: locks.c uses the BKL to protect the inode's lock list.
2750 */
2751
2752 status = posix_lock_file(filp, &file_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2754 switch (-status) {
2755 case 0: /* success! */
2756 update_stateid(&lock_stp->st_stateid);
2757 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2758 sizeof(stateid_t));
2759 goto out;
2760 case (EAGAIN):
2761 goto conflicting_lock;
2762 case (EDEADLK):
2763 status = nfserr_deadlock;
Al Viro7fcd53302006-01-18 17:43:48 -08002764 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2765 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002766 default:
Al Viro7fcd53302006-01-18 17:43:48 -08002767 status = nfserrno(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002768 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
J. Bruce Fields8a280512006-01-18 17:43:18 -08002769 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770 }
2771
2772conflicting_lock:
2773 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2774 status = nfserr_denied;
2775 /* XXX There is a race here. Future patch needed to provide
2776 * an atomic posix_lock_and_test_file
2777 */
2778 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2779 status = nfserr_serverfault;
2780 goto out;
2781 }
2782 nfs4_set_lock_denied(conflock, &lock->lk_denied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002783out:
J. Bruce Fields8a280512006-01-18 17:43:18 -08002784 if (status && lock->lk_is_new && lock_sop)
2785 release_stateowner(lock_sop);
J. Bruce Fields3a655882006-01-18 17:43:19 -08002786 if (lock->lk_replay_owner) {
2787 nfs4_get_stateowner(lock->lk_replay_owner);
2788 *replay_owner = lock->lk_replay_owner;
Neil Brownf2327d92005-09-13 01:25:37 -07002789 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790 nfs4_unlock_state();
2791 return status;
2792}
2793
2794/*
2795 * LOCKT operation
2796 */
2797int
2798nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2799{
2800 struct inode *inode;
2801 struct file file;
2802 struct file_lock file_lock;
2803 struct file_lock *conflicting_lock;
2804 int status;
2805
2806 if (nfs4_in_grace())
2807 return nfserr_grace;
2808
2809 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2810 return nfserr_inval;
2811
2812 lockt->lt_stateowner = NULL;
2813 nfs4_lock_state();
2814
2815 status = nfserr_stale_clientid;
Neil Brown849823c2005-09-13 01:25:36 -07002816 if (STALE_CLIENTID(&lockt->lt_clientid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002817 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002818
2819 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
Neil Brown849823c2005-09-13 01:25:36 -07002820 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821 if (status == nfserr_symlink)
2822 status = nfserr_inval;
2823 goto out;
2824 }
2825
2826 inode = current_fh->fh_dentry->d_inode;
2827 locks_init_lock(&file_lock);
2828 switch (lockt->lt_type) {
2829 case NFS4_READ_LT:
2830 case NFS4_READW_LT:
2831 file_lock.fl_type = F_RDLCK;
2832 break;
2833 case NFS4_WRITE_LT:
2834 case NFS4_WRITEW_LT:
2835 file_lock.fl_type = F_WRLCK;
2836 break;
2837 default:
2838 printk("NFSD: nfs4_lockt: bad lock type!\n");
2839 status = nfserr_inval;
2840 goto out;
2841 }
2842
2843 lockt->lt_stateowner = find_lockstateowner_str(inode,
2844 &lockt->lt_clientid, &lockt->lt_owner);
2845 if (lockt->lt_stateowner)
2846 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2847 file_lock.fl_pid = current->tgid;
2848 file_lock.fl_flags = FL_POSIX;
2849
2850 file_lock.fl_start = lockt->lt_offset;
2851 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2852 file_lock.fl_end = ~(u64)0;
2853 else
2854 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2855
2856 nfs4_transform_lock_offset(&file_lock);
2857
2858 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2859 * since LOCKT doesn't require an OPEN, and therefore a struct
2860 * file may not exist, pass posix_test_lock a struct file with
2861 * only the dentry:inode set.
2862 */
2863 memset(&file, 0, sizeof (struct file));
2864 file.f_dentry = current_fh->fh_dentry;
2865
2866 status = nfs_ok;
2867 conflicting_lock = posix_test_lock(&file, &file_lock);
2868 if (conflicting_lock) {
2869 status = nfserr_denied;
2870 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2871 }
2872out:
2873 nfs4_unlock_state();
2874 return status;
2875}
2876
2877int
Neil Brownf2327d92005-09-13 01:25:37 -07002878nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879{
2880 struct nfs4_stateid *stp;
2881 struct file *filp = NULL;
2882 struct file_lock file_lock;
2883 int status;
2884
2885 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2886 (long long) locku->lu_offset,
2887 (long long) locku->lu_length);
2888
2889 if (check_lock_length(locku->lu_offset, locku->lu_length))
2890 return nfserr_inval;
2891
2892 nfs4_lock_state();
2893
2894 if ((status = nfs4_preprocess_seqid_op(current_fh,
2895 locku->lu_seqid,
2896 &locku->lu_stateid,
2897 CHECK_FH | LOCK_STATE,
2898 &locku->lu_stateowner, &stp, NULL)))
2899 goto out;
2900
2901 filp = stp->st_vfs_file;
2902 BUG_ON(!filp);
2903 locks_init_lock(&file_lock);
2904 file_lock.fl_type = F_UNLCK;
2905 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2906 file_lock.fl_pid = current->tgid;
2907 file_lock.fl_file = filp;
2908 file_lock.fl_flags = FL_POSIX;
2909 file_lock.fl_start = locku->lu_offset;
2910
2911 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2912 file_lock.fl_end = ~(u64)0;
2913 else
2914 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2915 nfs4_transform_lock_offset(&file_lock);
2916
2917 /*
2918 * Try to unlock the file in the VFS.
2919 */
2920 status = posix_lock_file(filp, &file_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 if (status) {
Neil Brown849823c2005-09-13 01:25:36 -07002922 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 goto out_nfserr;
2924 }
2925 /*
2926 * OK, unlock succeeded; the only thing left to do is update the stateid.
2927 */
2928 update_stateid(&stp->st_stateid);
2929 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2930
2931out:
Neil Brownf2327d92005-09-13 01:25:37 -07002932 if (locku->lu_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002933 nfs4_get_stateowner(locku->lu_stateowner);
Neil Brownf2327d92005-09-13 01:25:37 -07002934 *replay_owner = locku->lu_stateowner;
2935 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002936 nfs4_unlock_state();
2937 return status;
2938
2939out_nfserr:
2940 status = nfserrno(status);
2941 goto out;
2942}
2943
2944/*
2945 * returns
2946 * 1: locks held by lockowner
2947 * 0: no locks held by lockowner
2948 */
2949static int
2950check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2951{
2952 struct file_lock **flpp;
2953 struct inode *inode = filp->f_dentry->d_inode;
2954 int status = 0;
2955
2956 lock_kernel();
2957 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
J. Bruce Fields796dadf2006-01-18 17:43:22 -08002958 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959 status = 1;
2960 goto out;
J. Bruce Fields796dadf2006-01-18 17:43:22 -08002961 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962 }
2963out:
2964 unlock_kernel();
2965 return status;
2966}
2967
2968int
2969nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2970{
2971 clientid_t *clid = &rlockowner->rl_clientid;
NeilBrown3e9e3db2005-06-23 22:04:20 -07002972 struct nfs4_stateowner *sop;
2973 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974 struct xdr_netobj *owner = &rlockowner->rl_owner;
NeilBrown3e9e3db2005-06-23 22:04:20 -07002975 struct list_head matches;
2976 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002977 int status;
2978
2979 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2980 clid->cl_boot, clid->cl_id);
2981
2982 /* XXX check for lease expiration */
2983
2984 status = nfserr_stale_clientid;
Neil Brown849823c2005-09-13 01:25:36 -07002985 if (STALE_CLIENTID(clid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002987
2988 nfs4_lock_state();
2989
NeilBrown3e9e3db2005-06-23 22:04:20 -07002990 status = nfserr_locks_held;
2991 /* XXX: we're doing a linear search through all the lockowners.
2992 * Yipes! For now we'll just hope clients aren't really using
2993 * release_lockowner much, but eventually we have to fix these
2994 * data structures. */
2995 INIT_LIST_HEAD(&matches);
2996 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2997 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
2998 if (!cmp_owner_str(sop, owner, clid))
2999 continue;
3000 list_for_each_entry(stp, &sop->so_stateids,
3001 st_perstateowner) {
3002 if (check_for_locks(stp->st_vfs_file, sop))
3003 goto out;
3004 /* Note: so_perclient unused for lockowners,
3005 * so it's OK to fool with here. */
3006 list_add(&sop->so_perclient, &matches);
3007 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003008 }
NeilBrown3e9e3db2005-06-23 22:04:20 -07003009 }
3010 /* Clients probably won't expect us to return with some (but not all)
3011 * of the lockowner state released; so don't release any until all
3012 * have been checked. */
3013 status = nfs_ok;
NeilBrown0fa822e2005-07-07 17:59:14 -07003014 while (!list_empty(&matches)) {
3015 sop = list_entry(matches.next, struct nfs4_stateowner,
3016 so_perclient);
3017 /* unhash_stateowner deletes so_perclient only
3018 * for openowners. */
3019 list_del(&sop->so_perclient);
NeilBrown3e9e3db2005-06-23 22:04:20 -07003020 release_stateowner(sop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021 }
3022out:
3023 nfs4_unlock_state();
3024 return status;
3025}
3026
3027static inline struct nfs4_client_reclaim *
NeilBrowna55370a2005-06-23 22:03:52 -07003028alloc_reclaim(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029{
NeilBrowna55370a2005-06-23 22:03:52 -07003030 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003031}
3032
NeilBrownc7b9a452005-06-23 22:04:30 -07003033int
3034nfs4_has_reclaimed_state(const char *name)
3035{
3036 unsigned int strhashval = clientstr_hashval(name);
3037 struct nfs4_client *clp;
3038
3039 clp = find_confirmed_client_by_str(name, strhashval);
3040 return clp ? 1 : 0;
3041}
3042
Linus Torvalds1da177e2005-04-16 15:20:36 -07003043/*
3044 * failure => all reset bets are off, nfserr_no_grace...
3045 */
NeilBrown190e4fb2005-06-23 22:04:25 -07003046int
3047nfs4_client_to_reclaim(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048{
3049 unsigned int strhashval;
3050 struct nfs4_client_reclaim *crp = NULL;
3051
NeilBrowna55370a2005-06-23 22:03:52 -07003052 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3053 crp = alloc_reclaim();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054 if (!crp)
3055 return 0;
NeilBrowna55370a2005-06-23 22:03:52 -07003056 strhashval = clientstr_hashval(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 INIT_LIST_HEAD(&crp->cr_strhash);
3058 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
NeilBrowna55370a2005-06-23 22:03:52 -07003059 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003060 reclaim_str_hashtbl_size++;
3061 return 1;
3062}
3063
3064static void
3065nfs4_release_reclaim(void)
3066{
3067 struct nfs4_client_reclaim *crp = NULL;
3068 int i;
3069
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3071 while (!list_empty(&reclaim_str_hashtbl[i])) {
3072 crp = list_entry(reclaim_str_hashtbl[i].next,
3073 struct nfs4_client_reclaim, cr_strhash);
3074 list_del(&crp->cr_strhash);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075 kfree(crp);
3076 reclaim_str_hashtbl_size--;
3077 }
3078 }
3079 BUG_ON(reclaim_str_hashtbl_size);
3080}
3081
3082/*
3083 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
NeilBrownfd39ca92005-06-23 22:04:03 -07003084static struct nfs4_client_reclaim *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085nfs4_find_reclaim_client(clientid_t *clid)
3086{
3087 unsigned int strhashval;
3088 struct nfs4_client *clp;
3089 struct nfs4_client_reclaim *crp = NULL;
3090
3091
3092 /* find clientid in conf_id_hashtbl */
3093 clp = find_confirmed_client(clid);
3094 if (clp == NULL)
3095 return NULL;
3096
NeilBrowna55370a2005-06-23 22:03:52 -07003097 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3098 clp->cl_name.len, clp->cl_name.data,
3099 clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100
3101 /* find clp->cl_name in reclaim_str_hashtbl */
NeilBrowna55370a2005-06-23 22:03:52 -07003102 strhashval = clientstr_hashval(clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
NeilBrowna55370a2005-06-23 22:03:52 -07003104 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 return crp;
3106 }
3107 }
3108 return NULL;
3109}
3110
3111/*
3112* Called from OPEN. Look for clientid in reclaim list.
3113*/
3114int
3115nfs4_check_open_reclaim(clientid_t *clid)
3116{
NeilBrowndfc83562005-06-23 22:03:16 -07003117 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003118}
3119
NeilBrownac4d8ff22005-06-23 22:03:30 -07003120/* initialization to perform at module load time: */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121
NeilBrownac4d8ff22005-06-23 22:03:30 -07003122void
3123nfs4_state_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003124{
3125 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003126
Linus Torvalds1da177e2005-04-16 15:20:36 -07003127 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3128 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3129 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3130 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3131 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3132 }
3133 for (i = 0; i < FILE_HASH_SIZE; i++) {
3134 INIT_LIST_HEAD(&file_hashtbl[i]);
3135 }
3136 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3137 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3138 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3139 }
3140 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3141 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3142 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3143 }
3144 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3145 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3146 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3147 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003148 memset(&onestateid, ~0, sizeof(stateid_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003149 INIT_LIST_HEAD(&close_lru);
3150 INIT_LIST_HEAD(&client_lru);
3151 INIT_LIST_HEAD(&del_recall_lru);
NeilBrownac4d8ff22005-06-23 22:03:30 -07003152 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3153 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3154 reclaim_str_hashtbl_size = 0;
NeilBrownac4d8ff22005-06-23 22:03:30 -07003155}
3156
NeilBrown190e4fb2005-06-23 22:04:25 -07003157static void
3158nfsd4_load_reboot_recovery_data(void)
3159{
3160 int status;
3161
NeilBrown0964a3d2005-06-23 22:04:32 -07003162 nfs4_lock_state();
3163 nfsd4_init_recdir(user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -07003164 status = nfsd4_recdir_load();
NeilBrown0964a3d2005-06-23 22:04:32 -07003165 nfs4_unlock_state();
NeilBrown190e4fb2005-06-23 22:04:25 -07003166 if (status)
3167 printk("NFSD: Failure reading reboot recovery data\n");
3168}
3169
NeilBrownac4d8ff22005-06-23 22:03:30 -07003170/* initialization to perform when the nfsd service is started: */
3171
3172static void
3173__nfs4_state_start(void)
3174{
3175 time_t grace_time;
3176
Linus Torvalds1da177e2005-04-16 15:20:36 -07003177 boot_time = get_seconds();
NeilBrownd99a05a2005-06-23 22:03:21 -07003178 grace_time = max(user_lease_time, lease_time);
3179 lease_time = user_lease_time;
NeilBrowna76b4312005-06-23 22:04:01 -07003180 in_grace = 1;
NeilBrownd99a05a2005-06-23 22:03:21 -07003181 printk("NFSD: starting %ld-second grace period\n", grace_time);
NeilBrown58da2822005-06-23 22:03:19 -07003182 laundry_wq = create_singlethread_workqueue("nfsd4");
NeilBrowna76b4312005-06-23 22:04:01 -07003183 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184}
3185
3186int
NeilBrown76a35502005-06-23 22:03:26 -07003187nfs4_state_start(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003188{
3189 int status;
3190
3191 if (nfs4_init)
3192 return 0;
3193 status = nfsd4_init_slabs();
3194 if (status)
3195 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -07003196 nfsd4_load_reboot_recovery_data();
NeilBrown76a35502005-06-23 22:03:26 -07003197 __nfs4_state_start();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003198 nfs4_init = 1;
3199 return 0;
3200}
3201
3202int
3203nfs4_in_grace(void)
3204{
NeilBrowna76b4312005-06-23 22:04:01 -07003205 return in_grace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003206}
3207
3208time_t
3209nfs4_lease_time(void)
3210{
3211 return lease_time;
3212}
3213
3214static void
3215__nfs4_state_shutdown(void)
3216{
3217 int i;
3218 struct nfs4_client *clp = NULL;
3219 struct nfs4_delegation *dp = NULL;
3220 struct nfs4_stateowner *sop = NULL;
3221 struct list_head *pos, *next, reaplist;
3222
3223 list_for_each_safe(pos, next, &close_lru) {
3224 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3225 list_del(&sop->so_close_lru);
3226 nfs4_put_stateowner(sop);
3227 }
3228
3229 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3230 while (!list_empty(&conf_id_hashtbl[i])) {
3231 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3232 expire_client(clp);
3233 }
3234 while (!list_empty(&unconf_str_hashtbl[i])) {
3235 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3236 expire_client(clp);
3237 }
3238 }
3239 INIT_LIST_HEAD(&reaplist);
3240 spin_lock(&recall_lock);
3241 list_for_each_safe(pos, next, &del_recall_lru) {
3242 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3243 list_move(&dp->dl_recall_lru, &reaplist);
3244 }
3245 spin_unlock(&recall_lock);
3246 list_for_each_safe(pos, next, &reaplist) {
3247 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3248 list_del_init(&dp->dl_recall_lru);
3249 unhash_delegation(dp);
3250 }
3251
Linus Torvalds1da177e2005-04-16 15:20:36 -07003252 cancel_delayed_work(&laundromat_work);
NeilBrown58da2822005-06-23 22:03:19 -07003253 flush_workqueue(laundry_wq);
3254 destroy_workqueue(laundry_wq);
NeilBrown190e4fb2005-06-23 22:04:25 -07003255 nfsd4_shutdown_recdir();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003256 nfs4_init = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003257}
3258
3259void
3260nfs4_state_shutdown(void)
3261{
3262 nfs4_lock_state();
3263 nfs4_release_reclaim();
3264 __nfs4_state_shutdown();
3265 nfsd4_free_slabs();
3266 nfs4_unlock_state();
3267}
3268
NeilBrown0964a3d2005-06-23 22:04:32 -07003269static void
3270nfs4_set_recdir(char *recdir)
3271{
3272 nfs4_lock_state();
3273 strcpy(user_recovery_dirname, recdir);
3274 nfs4_unlock_state();
3275}
3276
3277/*
3278 * Change the NFSv4 recovery directory to recdir.
3279 */
3280int
3281nfs4_reset_recoverydir(char *recdir)
3282{
3283 int status;
3284 struct nameidata nd;
3285
3286 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3287 if (status)
3288 return status;
3289 status = -ENOTDIR;
3290 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3291 nfs4_set_recdir(recdir);
3292 status = 0;
3293 }
3294 path_release(&nd);
3295 return status;
3296}
3297
Linus Torvalds1da177e2005-04-16 15:20:36 -07003298/*
3299 * Called when leasetime is changed.
3300 *
NeilBrownd99a05a2005-06-23 22:03:21 -07003301 * The only way the protocol gives us to handle on-the-fly lease changes is to
3302 * simulate a reboot. Instead of doing that, we just wait till the next time
3303 * we start to register any changes in lease time. If the administrator
3304 * really wants to change the lease time *now*, they can go ahead and bring
3305 * nfsd down and then back up again after changing the lease time.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003306 */
3307void
3308nfs4_reset_lease(time_t leasetime)
3309{
NeilBrownd99a05a2005-06-23 22:03:21 -07003310 lock_kernel();
3311 user_lease_time = leasetime;
3312 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003313}