blob: 8799b8708188a3acf901f1d09b8e773865d139c5 [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>
Dave Hansenaceaf782008-02-15 14:37:31 -080044#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
NeilBrown0964a3d2005-06-23 22:04:32 -070052#include <linux/namei.h>
Meelap Shahc2f1a552007-07-17 04:04:39 -070053#include <linux/swap.h>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080054#include <linux/mutex.h>
Marc Eshelfd85b812006-11-28 16:26:41 -050055#include <linux/lockd/bind.h>
Marc Eshel9a8db972007-07-17 04:04:35 -070056#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#define NFSDDBG_FACILITY NFSDDBG_PROC
59
60/* Globals */
61static time_t lease_time = 90; /* default lease time */
NeilBrownd99a05a2005-06-23 22:03:21 -070062static time_t user_lease_time = 90;
NeilBrownfd39ca92005-06-23 22:04:03 -070063static time_t boot_time;
NeilBrowna76b4312005-06-23 22:04:01 -070064static int in_grace = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
NeilBrownfd39ca92005-06-23 22:04:03 -070069static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/* forward declarations */
NeilBrownfd39ca92005-06-23 22:04:03 -070076static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
78static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
NeilBrown0964a3d2005-06-23 22:04:32 -070079static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80static void nfs4_set_recdir(char *recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82/* Locking:
83 *
Ingo Molnar353ab6e2006-03-26 01:37:12 -080084 * client_mutex:
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 * protects clientid_hashtbl[], clientstr_hashtbl[],
86 * unconfstr_hashtbl[], uncofid_hashtbl[].
87 */
Ingo Molnar353ab6e2006-03-26 01:37:12 -080088static DEFINE_MUTEX(client_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Christoph Lametere18b8902006-12-06 20:33:20 -080090static struct kmem_cache *stateowner_slab = NULL;
91static struct kmem_cache *file_slab = NULL;
92static struct kmem_cache *stateid_slab = NULL;
93static struct kmem_cache *deleg_slab = NULL;
NeilBrowne60d4392005-06-23 22:03:01 -070094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095void
96nfs4_lock_state(void)
97{
Ingo Molnar353ab6e2006-03-26 01:37:12 -080098 mutex_lock(&client_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
101void
102nfs4_unlock_state(void)
103{
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800104 mutex_unlock(&client_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
107static inline u32
108opaque_hashval(const void *ptr, int nbytes)
109{
110 unsigned char *cptr = (unsigned char *) ptr;
111
112 u32 x = 0;
113 while (nbytes--) {
114 x *= 37;
115 x += *cptr++;
116 }
117 return x;
118}
119
120/* forward declarations */
121static void release_stateowner(struct nfs4_stateowner *sop);
122static void release_stateid(struct nfs4_stateid *stp, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124/*
125 * Delegation state
126 */
127
128/* recall_lock protects the del_recall_lru */
Ingo Molnar34af9462006-06-27 02:53:55 -0700129static DEFINE_SPINLOCK(recall_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130static struct list_head del_recall_lru;
131
NeilBrown13cd2182005-06-23 22:03:10 -0700132static void
133free_nfs4_file(struct kref *kref)
134{
135 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
136 list_del(&fp->fi_hash);
137 iput(fp->fi_inode);
138 kmem_cache_free(file_slab, fp);
139}
140
141static inline void
142put_nfs4_file(struct nfs4_file *fi)
143{
144 kref_put(&fi->fi_ref, free_nfs4_file);
145}
146
147static inline void
148get_nfs4_file(struct nfs4_file *fi)
149{
150 kref_get(&fi->fi_ref);
151}
152
NeilBrownef0f3392006-04-10 22:55:41 -0700153static int num_delegations;
Meelap Shahc2f1a552007-07-17 04:04:39 -0700154unsigned int max_delegations;
NeilBrownef0f3392006-04-10 22:55:41 -0700155
156/*
157 * Open owner state (share locks)
158 */
159
160/* hash tables for nfs4_stateowner */
161#define OWNER_HASH_BITS 8
162#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
163#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
164
165#define ownerid_hashval(id) \
166 ((id) & OWNER_HASH_MASK)
167#define ownerstr_hashval(clientid, ownername) \
168 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
169
170static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
171static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
172
173/* hash table for nfs4_file */
174#define FILE_HASH_BITS 8
175#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
176#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
177/* hash table for (open)nfs4_stateid */
178#define STATEID_HASH_BITS 10
179#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
180#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
181
182#define file_hashval(x) \
183 hash_ptr(x, FILE_HASH_BITS)
184#define stateid_hashval(owner_id, file_id) \
185 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
186
187static struct list_head file_hashtbl[FILE_HASH_SIZE];
188static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190static struct nfs4_delegation *
191alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
192{
193 struct nfs4_delegation *dp;
194 struct nfs4_file *fp = stp->st_file;
195 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
196
197 dprintk("NFSD alloc_init_deleg\n");
Meelap Shah47f99402007-07-17 04:04:40 -0700198 if (fp->fi_had_conflict)
199 return NULL;
Meelap Shahc2f1a552007-07-17 04:04:39 -0700200 if (num_delegations > max_delegations)
NeilBrownef0f3392006-04-10 22:55:41 -0700201 return NULL;
NeilBrown5b2d21c2005-06-23 22:03:04 -0700202 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
203 if (dp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return dp;
NeilBrownef0f3392006-04-10 22:55:41 -0700205 num_delegations++;
NeilBrownea1da632005-06-23 22:04:17 -0700206 INIT_LIST_HEAD(&dp->dl_perfile);
207 INIT_LIST_HEAD(&dp->dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 INIT_LIST_HEAD(&dp->dl_recall_lru);
209 dp->dl_client = clp;
NeilBrown13cd2182005-06-23 22:03:10 -0700210 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 dp->dl_file = fp;
212 dp->dl_flock = NULL;
213 get_file(stp->st_vfs_file);
214 dp->dl_vfs_file = stp->st_vfs_file;
215 dp->dl_type = type;
216 dp->dl_recall.cbr_dp = NULL;
217 dp->dl_recall.cbr_ident = cb->cb_ident;
218 dp->dl_recall.cbr_trunc = 0;
219 dp->dl_stateid.si_boot = boot_time;
220 dp->dl_stateid.si_stateownerid = current_delegid++;
221 dp->dl_stateid.si_fileid = 0;
222 dp->dl_stateid.si_generation = 0;
223 dp->dl_fhlen = current_fh->fh_handle.fh_size;
224 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
225 current_fh->fh_handle.fh_size);
226 dp->dl_time = 0;
227 atomic_set(&dp->dl_count, 1);
NeilBrownea1da632005-06-23 22:04:17 -0700228 list_add(&dp->dl_perfile, &fp->fi_delegations);
229 list_add(&dp->dl_perclnt, &clp->cl_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return dp;
231}
232
233void
234nfs4_put_delegation(struct nfs4_delegation *dp)
235{
236 if (atomic_dec_and_test(&dp->dl_count)) {
237 dprintk("NFSD: freeing dp %p\n",dp);
NeilBrown13cd2182005-06-23 22:03:10 -0700238 put_nfs4_file(dp->dl_file);
NeilBrown5b2d21c2005-06-23 22:03:04 -0700239 kmem_cache_free(deleg_slab, dp);
NeilBrownef0f3392006-04-10 22:55:41 -0700240 num_delegations--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 }
242}
243
244/* Remove the associated file_lock first, then remove the delegation.
245 * lease_modify() is called to remove the FS_LEASE file_lock from
246 * the i_flock list, eventually calling nfsd's lock_manager
247 * fl_release_callback.
248 */
249static void
250nfs4_close_delegation(struct nfs4_delegation *dp)
251{
252 struct file *filp = dp->dl_vfs_file;
253
254 dprintk("NFSD: close_delegation dp %p\n",dp);
255 dp->dl_vfs_file = NULL;
256 /* The following nfsd_close may not actually close the file,
257 * but we want to remove the lease in any case. */
NeilBrownc9071322005-04-16 15:26:38 -0700258 if (dp->dl_flock)
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -0400259 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 nfsd_close(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
262
263/* Called under the state lock. */
264static void
265unhash_delegation(struct nfs4_delegation *dp)
266{
NeilBrownea1da632005-06-23 22:04:17 -0700267 list_del_init(&dp->dl_perfile);
268 list_del_init(&dp->dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 spin_lock(&recall_lock);
270 list_del_init(&dp->dl_recall_lru);
271 spin_unlock(&recall_lock);
272 nfs4_close_delegation(dp);
273 nfs4_put_delegation(dp);
274}
275
276/*
277 * SETCLIENTID state
278 */
279
280/* Hash tables for nfs4_clientid state */
281#define CLIENT_HASH_BITS 4
282#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
283#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
284
285#define clientid_hashval(id) \
286 ((id) & CLIENT_HASH_MASK)
NeilBrowna55370a2005-06-23 22:03:52 -0700287#define clientstr_hashval(name) \
288 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289/*
290 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
291 * used in reboot/reset lease grace period processing
292 *
293 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
294 * setclientid_confirmed info.
295 *
296 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
297 * setclientid info.
298 *
299 * client_lru holds client queue ordered by nfs4_client.cl_time
300 * for lease renewal.
301 *
302 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
303 * for last close replay.
304 */
305static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
306static int reclaim_str_hashtbl_size = 0;
307static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
311static struct list_head client_lru;
312static struct list_head close_lru;
313
314static inline void
315renew_client(struct nfs4_client *clp)
316{
317 /*
318 * Move client to the end to the LRU list.
319 */
320 dprintk("renewing client (clientid %08x/%08x)\n",
321 clp->cl_clientid.cl_boot,
322 clp->cl_clientid.cl_id);
323 list_move_tail(&clp->cl_lru, &client_lru);
324 clp->cl_time = get_seconds();
325}
326
327/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
328static int
329STALE_CLIENTID(clientid_t *clid)
330{
331 if (clid->cl_boot == boot_time)
332 return 0;
333 dprintk("NFSD stale clientid (%08x/%08x)\n",
334 clid->cl_boot, clid->cl_id);
335 return 1;
336}
337
338/*
339 * XXX Should we use a slab cache ?
340 * This type of memory management is somewhat inefficient, but we use it
341 * anyway since SETCLIENTID is not a common operation.
342 */
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500343static struct nfs4_client *alloc_client(struct xdr_netobj name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 struct nfs4_client *clp;
346
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500347 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
348 if (clp == NULL)
349 return NULL;
350 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
351 if (clp->cl_name.data == NULL) {
352 kfree(clp);
353 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500355 memcpy(clp->cl_name.data, name.data, name.len);
356 clp->cl_name.len = name.len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return clp;
358}
359
J. Bruce Fields1b1a9b32007-09-12 08:43:59 -0400360static void
361shutdown_callback_client(struct nfs4_client *clp)
362{
363 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
364
J. Bruce Fields1b1a9b32007-09-12 08:43:59 -0400365 if (clnt) {
J. Bruce Fields404ec112007-11-23 22:26:18 -0500366 /*
367 * Callback threads take a reference on the client, so there
368 * should be no outstanding callbacks at this point.
369 */
J. Bruce Fields1b1a9b32007-09-12 08:43:59 -0400370 clp->cl_callback.cb_client = NULL;
371 rpc_shutdown_client(clnt);
372 }
373}
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375static inline void
376free_client(struct nfs4_client *clp)
377{
J. Bruce Fields1b1a9b32007-09-12 08:43:59 -0400378 shutdown_callback_client(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (clp->cl_cred.cr_group_info)
380 put_group_info(clp->cl_cred.cr_group_info);
381 kfree(clp->cl_name.data);
382 kfree(clp);
383}
384
385void
386put_nfs4_client(struct nfs4_client *clp)
387{
388 if (atomic_dec_and_test(&clp->cl_count))
389 free_client(clp);
390}
391
392static void
393expire_client(struct nfs4_client *clp)
394{
395 struct nfs4_stateowner *sop;
396 struct nfs4_delegation *dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 struct list_head reaplist;
398
399 dprintk("NFSD: expire_client cl_count %d\n",
400 atomic_read(&clp->cl_count));
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 INIT_LIST_HEAD(&reaplist);
403 spin_lock(&recall_lock);
NeilBrownea1da632005-06-23 22:04:17 -0700404 while (!list_empty(&clp->cl_delegations)) {
405 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
407 dp->dl_flock);
NeilBrownea1da632005-06-23 22:04:17 -0700408 list_del_init(&dp->dl_perclnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 list_move(&dp->dl_recall_lru, &reaplist);
410 }
411 spin_unlock(&recall_lock);
412 while (!list_empty(&reaplist)) {
413 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
414 list_del_init(&dp->dl_recall_lru);
415 unhash_delegation(dp);
416 }
417 list_del(&clp->cl_idhash);
418 list_del(&clp->cl_strhash);
419 list_del(&clp->cl_lru);
NeilBrownea1da632005-06-23 22:04:17 -0700420 while (!list_empty(&clp->cl_openowners)) {
421 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 release_stateowner(sop);
423 }
424 put_nfs4_client(clp);
425}
426
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500427static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
428{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 struct nfs4_client *clp;
430
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500431 clp = alloc_client(name);
432 if (clp == NULL)
433 return NULL;
NeilBrowna55370a2005-06-23 22:03:52 -0700434 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 atomic_set(&clp->cl_count, 1);
436 atomic_set(&clp->cl_callback.cb_set, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 INIT_LIST_HEAD(&clp->cl_idhash);
438 INIT_LIST_HEAD(&clp->cl_strhash);
NeilBrownea1da632005-06-23 22:04:17 -0700439 INIT_LIST_HEAD(&clp->cl_openowners);
440 INIT_LIST_HEAD(&clp->cl_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 INIT_LIST_HEAD(&clp->cl_lru);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 return clp;
443}
444
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500445static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
446{
447 memcpy(target->cl_verifier.data, source->data,
448 sizeof(target->cl_verifier.data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500451static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
452{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
454 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
455}
456
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500457static void copy_cred(struct svc_cred *target, struct svc_cred *source)
458{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 target->cr_uid = source->cr_uid;
460 target->cr_gid = source->cr_gid;
461 target->cr_group_info = source->cr_group_info;
462 get_group_info(target->cr_group_info);
463}
464
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500465static int same_name(const char *n1, const char *n2)
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400466{
NeilBrowna55370a2005-06-23 22:03:52 -0700467 return 0 == memcmp(n1, n2, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
470static int
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400471same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
472{
473 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474}
475
476static int
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400477same_clid(clientid_t *cl1, clientid_t *cl2)
478{
479 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
482/* XXX what about NGROUP */
483static int
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400484same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
485{
486 return cr1->cr_uid == cr2->cr_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
J. Bruce Fields5ec7b462007-11-21 21:58:56 -0500489static void gen_clid(struct nfs4_client *clp)
490{
491 static u32 current_clientid = 1;
492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 clp->cl_clientid.cl_boot = boot_time;
494 clp->cl_clientid.cl_id = current_clientid++;
495}
496
J. Bruce Fieldsdeda2fa2007-11-19 20:31:04 -0500497static void gen_confirm(struct nfs4_client *clp)
498{
499 static u32 i;
500 u32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 p = (u32 *)clp->cl_confirm.data;
J. Bruce Fieldsdeda2fa2007-11-19 20:31:04 -0500503 *p++ = get_seconds();
504 *p++ = i++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505}
506
J. Bruce Fields35bba9a2007-11-21 22:07:08 -0500507static int check_name(struct xdr_netobj name)
508{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 if (name.len == 0)
510 return 0;
511 if (name.len > NFS4_OPAQUE_LIMIT) {
J. Bruce Fields2fdada02007-07-27 16:10:37 -0400512 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 return 0;
514 }
515 return 1;
516}
517
NeilBrownfd39ca92005-06-23 22:04:03 -0700518static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
520{
521 unsigned int idhashval;
522
523 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
524 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
525 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
526 list_add_tail(&clp->cl_lru, &client_lru);
527 clp->cl_time = get_seconds();
528}
529
NeilBrownfd39ca92005-06-23 22:04:03 -0700530static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531move_to_confirmed(struct nfs4_client *clp)
532{
533 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
534 unsigned int strhashval;
535
536 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
537 list_del_init(&clp->cl_strhash);
Akinobu Mitaf1166292006-06-26 00:24:46 -0700538 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
NeilBrowna55370a2005-06-23 22:03:52 -0700539 strhashval = clientstr_hashval(clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
541 renew_client(clp);
542}
543
544static struct nfs4_client *
545find_confirmed_client(clientid_t *clid)
546{
547 struct nfs4_client *clp;
548 unsigned int idhashval = clientid_hashval(clid->cl_id);
549
550 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400551 if (same_clid(&clp->cl_clientid, clid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return clp;
553 }
554 return NULL;
555}
556
557static struct nfs4_client *
558find_unconfirmed_client(clientid_t *clid)
559{
560 struct nfs4_client *clp;
561 unsigned int idhashval = clientid_hashval(clid->cl_id);
562
563 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400564 if (same_clid(&clp->cl_clientid, clid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 return clp;
566 }
567 return NULL;
568}
569
NeilBrown28ce6052005-06-23 22:03:56 -0700570static struct nfs4_client *
571find_confirmed_client_by_str(const char *dname, unsigned int hashval)
572{
573 struct nfs4_client *clp;
574
575 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
576 if (same_name(clp->cl_recdir, dname))
577 return clp;
578 }
579 return NULL;
580}
581
582static struct nfs4_client *
583find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
584{
585 struct nfs4_client *clp;
586
587 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
588 if (same_name(clp->cl_recdir, dname))
589 return clp;
590 }
591 return NULL;
592}
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594/* a helper function for parse_callback */
595static int
596parse_octet(unsigned int *lenp, char **addrp)
597{
598 unsigned int len = *lenp;
599 char *p = *addrp;
600 int n = -1;
601 char c;
602
603 for (;;) {
604 if (!len)
605 break;
606 len--;
607 c = *p++;
608 if (c == '.')
609 break;
610 if ((c < '0') || (c > '9')) {
611 n = -1;
612 break;
613 }
614 if (n < 0)
615 n = 0;
616 n = (n * 10) + (c - '0');
617 if (n > 255) {
618 n = -1;
619 break;
620 }
621 }
622 *lenp = len;
623 *addrp = p;
624 return n;
625}
626
627/* parse and set the setclientid ipv4 callback address */
NeilBrownfd39ca92005-06-23 22:04:03 -0700628static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
630{
631 int temp = 0;
632 u32 cbaddr = 0;
633 u16 cbport = 0;
634 u32 addrlen = addr_len;
635 char *addr = addr_val;
636 int i, shift;
637
638 /* ipaddress */
639 shift = 24;
640 for(i = 4; i > 0 ; i--) {
641 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
642 return 0;
643 }
644 cbaddr |= (temp << shift);
645 if (shift > 0)
646 shift -= 8;
647 }
648 *cbaddrp = cbaddr;
649
650 /* port */
651 shift = 8;
652 for(i = 2; i > 0 ; i--) {
653 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
654 return 0;
655 }
656 cbport |= (temp << shift);
657 if (shift > 0)
658 shift -= 8;
659 }
660 *cbportp = cbport;
661 return 1;
662}
663
NeilBrownfd39ca92005-06-23 22:04:03 -0700664static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
666{
667 struct nfs4_callback *cb = &clp->cl_callback;
668
669 /* Currently, we only support tcp for the callback channel */
670 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
671 goto out_err;
672
673 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
674 &cb->cb_addr, &cb->cb_port)))
675 goto out_err;
676 cb->cb_prog = se->se_callback_prog;
677 cb->cb_ident = se->se_callback_ident;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 return;
679out_err:
Neil Brown849823c2005-09-13 01:25:36 -0700680 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 "will not receive delegations\n",
682 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 return;
685}
686
Al Virob37ad282006-10-19 23:28:59 -0700687__be32
J.Bruce Fieldsb5914802006-12-13 00:35:38 -0800688nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
689 struct nfsd4_setclientid *setclid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690{
Chuck Lever27459f02007-02-12 00:53:34 -0800691 struct sockaddr_in *sin = svc_addr_in(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 struct xdr_netobj clname = {
693 .len = setclid->se_namelen,
694 .data = setclid->se_name,
695 };
696 nfs4_verifier clverifier = setclid->se_verf;
697 unsigned int strhashval;
NeilBrown28ce6052005-06-23 22:03:56 -0700698 struct nfs4_client *conf, *unconf, *new;
Al Virob37ad282006-10-19 23:28:59 -0700699 __be32 status;
NeilBrowna55370a2005-06-23 22:03:52 -0700700 char dname[HEXDIR_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (!check_name(clname))
Neil Brown73aea4e2005-09-13 01:25:39 -0700703 return nfserr_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
NeilBrowna55370a2005-06-23 22:03:52 -0700705 status = nfs4_make_rec_clidname(dname, &clname);
706 if (status)
Neil Brown73aea4e2005-09-13 01:25:39 -0700707 return status;
NeilBrowna55370a2005-06-23 22:03:52 -0700708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 /*
710 * XXX The Duplicate Request Cache (DRC) has been checked (??)
711 * We get here on a DRC miss.
712 */
713
NeilBrowna55370a2005-06-23 22:03:52 -0700714 strhashval = clientstr_hashval(dname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 nfs4_lock_state();
NeilBrown28ce6052005-06-23 22:03:56 -0700717 conf = find_confirmed_client_by_str(dname, strhashval);
718 if (conf) {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500719 /* RFC 3530 14.2.33 CASE 0: */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 status = nfserr_clid_inuse;
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400721 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
Chuck Lever27459f02007-02-12 00:53:34 -0800722 || conf->cl_addr != sin->sin_addr.s_addr) {
Bruce Fields21315ed2007-03-26 21:32:09 -0800723 dprintk("NFSD: setclientid: string in use by client"
724 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 goto out;
726 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 }
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500728 /*
729 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
730 * has a description of SETCLIENTID request processing consisting
731 * of 5 bullet points, labeled as CASE0 - CASE4 below.
732 */
NeilBrown28ce6052005-06-23 22:03:56 -0700733 unconf = find_unconfirmed_client_by_str(dname, strhashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 status = nfserr_resource;
735 if (!conf) {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500736 /*
737 * RFC 3530 14.2.33 CASE 4:
738 * placed first, because it is the normal case
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 */
740 if (unconf)
741 expire_client(unconf);
NeilBrowna55370a2005-06-23 22:03:52 -0700742 new = create_client(clname, dname);
743 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 gen_clid(new);
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400746 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 /*
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500748 * RFC 3530 14.2.33 CASE 1:
749 * probable callback update
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 */
NeilBrown31f4a6c2005-06-23 22:04:06 -0700751 if (unconf) {
752 /* Note this is removing unconfirmed {*x***},
753 * which is stronger than RFC recommended {vxc**}.
754 * This has the advantage that there is at most
755 * one {*x***} in either list at any time.
756 */
757 expire_client(unconf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
NeilBrowna55370a2005-06-23 22:03:52 -0700759 new = create_client(clname, dname);
760 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 copy_clid(new, conf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 } else if (!unconf) {
764 /*
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500765 * RFC 3530 14.2.33 CASE 2:
766 * probable client reboot; state will be removed if
767 * confirmed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 */
NeilBrowna55370a2005-06-23 22:03:52 -0700769 new = create_client(clname, dname);
770 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 gen_clid(new);
J. Bruce Fields49ba8782007-11-19 19:09:50 -0500773 } else {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500774 /*
775 * RFC 3530 14.2.33 CASE 3:
776 * probable client reboot; state will be removed if
777 * confirmed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 */
779 expire_client(unconf);
NeilBrowna55370a2005-06-23 22:03:52 -0700780 new = create_client(clname, dname);
781 if (new == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 gen_clid(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 }
J. Bruce Fieldsc175b832007-08-09 18:34:32 -0400785 copy_verf(new, &clverifier);
786 new->cl_addr = sin->sin_addr.s_addr;
787 copy_cred(&new->cl_cred, &rqstp->rq_cred);
788 gen_confirm(new);
789 gen_callback(new, setclid);
790 add_to_unconfirmed(new, strhashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
792 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
793 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
794 status = nfs_ok;
795out:
796 nfs4_unlock_state();
797 return status;
798}
799
800
801/*
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500802 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
803 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
804 * bullets, labeled as CASE1 - CASE4 below.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 */
Al Virob37ad282006-10-19 23:28:59 -0700806__be32
J.Bruce Fieldsb5914802006-12-13 00:35:38 -0800807nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
808 struct nfsd4_compound_state *cstate,
809 struct nfsd4_setclientid_confirm *setclientid_confirm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810{
Chuck Lever27459f02007-02-12 00:53:34 -0800811 struct sockaddr_in *sin = svc_addr_in(rqstp);
NeilBrown21ab45a2005-06-23 22:04:14 -0700812 struct nfs4_client *conf, *unconf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
814 clientid_t * clid = &setclientid_confirm->sc_clientid;
Al Virob37ad282006-10-19 23:28:59 -0700815 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
817 if (STALE_CLIENTID(clid))
818 return nfserr_stale_clientid;
819 /*
820 * XXX The Duplicate Request Cache (DRC) has been checked (??)
821 * We get here on a DRC miss.
822 */
823
824 nfs4_lock_state();
NeilBrown21ab45a2005-06-23 22:04:14 -0700825
826 conf = find_confirmed_client(clid);
827 unconf = find_unconfirmed_client(clid);
828
829 status = nfserr_clid_inuse;
Chuck Lever27459f02007-02-12 00:53:34 -0800830 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
NeilBrown21ab45a2005-06-23 22:04:14 -0700831 goto out;
Chuck Lever27459f02007-02-12 00:53:34 -0800832 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
NeilBrown21ab45a2005-06-23 22:04:14 -0700833 goto out;
834
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500835 /*
836 * section 14.2.34 of RFC 3530 has a description of
837 * SETCLIENTID_CONFIRM request processing consisting
838 * of 4 bullet points, labeled as CASE1 - CASE4 below.
839 */
J. Bruce Fields366e0c12007-11-20 15:54:10 -0500840 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500841 /*
842 * RFC 3530 14.2.34 CASE 1:
843 * callback update
844 */
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400845 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 status = nfserr_clid_inuse;
847 else {
NeilBrown1a69c172005-06-23 22:04:08 -0700848 /* XXX: We just turn off callbacks until we can handle
849 * change request correctly. */
NeilBrowncb36d632005-06-23 22:04:23 -0700850 atomic_set(&conf->cl_callback.cb_set, 0);
NeilBrown21ab45a2005-06-23 22:04:14 -0700851 gen_confirm(conf);
NeilBrown46309022005-07-07 17:59:10 -0700852 nfsd4_remove_clid_dir(unconf);
NeilBrown1a69c172005-06-23 22:04:08 -0700853 expire_client(unconf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 status = nfs_ok;
NeilBrown1a69c172005-06-23 22:04:08 -0700855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 }
J. Bruce Fieldsf3aba4e2007-11-20 16:52:07 -0500857 } else if (conf && !unconf) {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500858 /*
859 * RFC 3530 14.2.34 CASE 2:
860 * probable retransmitted request; play it safe and
861 * do nothing.
NeilBrown7c79f732005-06-23 22:04:13 -0700862 */
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400863 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 status = nfserr_clid_inuse;
NeilBrown21ab45a2005-06-23 22:04:14 -0700865 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 status = nfs_ok;
NeilBrown7c79f732005-06-23 22:04:13 -0700867 } else if (!conf && unconf
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400868 && same_verf(&unconf->cl_confirm, &confirm)) {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500869 /*
870 * RFC 3530 14.2.34 CASE 3:
871 * Normal case; new or rebooted client:
NeilBrown7c79f732005-06-23 22:04:13 -0700872 */
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400873 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 status = nfserr_clid_inuse;
875 } else {
NeilBrown1a69c172005-06-23 22:04:08 -0700876 unsigned int hash =
877 clientstr_hashval(unconf->cl_recdir);
878 conf = find_confirmed_client_by_str(unconf->cl_recdir,
879 hash);
880 if (conf) {
NeilBrownc7b9a452005-06-23 22:04:30 -0700881 nfsd4_remove_clid_dir(conf);
NeilBrown1a69c172005-06-23 22:04:08 -0700882 expire_client(conf);
883 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 move_to_confirmed(unconf);
NeilBrown21ab45a2005-06-23 22:04:14 -0700885 conf = unconf;
J. Bruce Fields46f8a642007-11-22 13:54:18 -0500886 nfsd4_probe_callback(conf);
NeilBrown1a69c172005-06-23 22:04:08 -0700887 status = nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 }
J. Bruce Fields599e0a22007-07-26 17:04:54 -0400889 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
890 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
NeilBrown7c79f732005-06-23 22:04:13 -0700891 &confirm)))) {
J. Bruce Fieldsa186e762007-11-20 16:11:27 -0500892 /*
893 * RFC 3530 14.2.34 CASE 4:
894 * Client probably hasn't noticed that we rebooted yet.
NeilBrown7c79f732005-06-23 22:04:13 -0700895 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 status = nfserr_stale_clientid;
NeilBrown7c79f732005-06-23 22:04:13 -0700897 } else {
NeilBrown08e89872005-06-23 22:04:11 -0700898 /* check that we have hit one of the cases...*/
899 status = nfserr_clid_inuse;
900 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 nfs4_unlock_state();
903 return status;
904}
905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906/* OPEN Share state helper functions */
907static inline struct nfs4_file *
908alloc_init_file(struct inode *ino)
909{
910 struct nfs4_file *fp;
911 unsigned int hashval = file_hashval(ino);
912
NeilBrowne60d4392005-06-23 22:03:01 -0700913 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
914 if (fp) {
NeilBrown13cd2182005-06-23 22:03:10 -0700915 kref_init(&fp->fi_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 INIT_LIST_HEAD(&fp->fi_hash);
NeilBrown8beefa22005-06-23 22:03:08 -0700917 INIT_LIST_HEAD(&fp->fi_stateids);
918 INIT_LIST_HEAD(&fp->fi_delegations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
920 fp->fi_inode = igrab(ino);
921 fp->fi_id = current_fileid++;
Meelap Shah47f99402007-07-17 04:04:40 -0700922 fp->fi_had_conflict = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 return fp;
924 }
925 return NULL;
926}
927
928static void
Christoph Lametere18b8902006-12-06 20:33:20 -0800929nfsd4_free_slab(struct kmem_cache **slab)
NeilBrowne60d4392005-06-23 22:03:01 -0700930{
NeilBrowne60d4392005-06-23 22:03:01 -0700931 if (*slab == NULL)
932 return;
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700933 kmem_cache_destroy(*slab);
NeilBrowne60d4392005-06-23 22:03:01 -0700934 *slab = NULL;
NeilBrowne60d4392005-06-23 22:03:01 -0700935}
936
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -0400937void
NeilBrowne60d4392005-06-23 22:03:01 -0700938nfsd4_free_slabs(void)
939{
940 nfsd4_free_slab(&stateowner_slab);
941 nfsd4_free_slab(&file_slab);
NeilBrown5ac049a2005-06-23 22:03:03 -0700942 nfsd4_free_slab(&stateid_slab);
NeilBrown5b2d21c2005-06-23 22:03:04 -0700943 nfsd4_free_slab(&deleg_slab);
NeilBrowne60d4392005-06-23 22:03:01 -0700944}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946static int
947nfsd4_init_slabs(void)
948{
949 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
Paul Mundt20c2df82007-07-20 10:11:58 +0900950 sizeof(struct nfs4_stateowner), 0, 0, NULL);
NeilBrowne60d4392005-06-23 22:03:01 -0700951 if (stateowner_slab == NULL)
952 goto out_nomem;
953 file_slab = kmem_cache_create("nfsd4_files",
Paul Mundt20c2df82007-07-20 10:11:58 +0900954 sizeof(struct nfs4_file), 0, 0, NULL);
NeilBrowne60d4392005-06-23 22:03:01 -0700955 if (file_slab == NULL)
956 goto out_nomem;
NeilBrown5ac049a2005-06-23 22:03:03 -0700957 stateid_slab = kmem_cache_create("nfsd4_stateids",
Paul Mundt20c2df82007-07-20 10:11:58 +0900958 sizeof(struct nfs4_stateid), 0, 0, NULL);
NeilBrown5ac049a2005-06-23 22:03:03 -0700959 if (stateid_slab == NULL)
960 goto out_nomem;
NeilBrown5b2d21c2005-06-23 22:03:04 -0700961 deleg_slab = kmem_cache_create("nfsd4_delegations",
Paul Mundt20c2df82007-07-20 10:11:58 +0900962 sizeof(struct nfs4_delegation), 0, 0, NULL);
NeilBrown5b2d21c2005-06-23 22:03:04 -0700963 if (deleg_slab == NULL)
964 goto out_nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 return 0;
NeilBrowne60d4392005-06-23 22:03:01 -0700966out_nomem:
967 nfsd4_free_slabs();
968 dprintk("nfsd4: out of memory while initializing nfsv4\n");
969 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970}
971
972void
973nfs4_free_stateowner(struct kref *kref)
974{
975 struct nfs4_stateowner *sop =
976 container_of(kref, struct nfs4_stateowner, so_ref);
977 kfree(sop->so_owner.data);
978 kmem_cache_free(stateowner_slab, sop);
979}
980
981static inline struct nfs4_stateowner *
982alloc_stateowner(struct xdr_netobj *owner)
983{
984 struct nfs4_stateowner *sop;
985
986 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
987 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
988 memcpy(sop->so_owner.data, owner->data, owner->len);
989 sop->so_owner.len = owner->len;
990 kref_init(&sop->so_ref);
991 return sop;
992 }
993 kmem_cache_free(stateowner_slab, sop);
994 }
995 return NULL;
996}
997
998static struct nfs4_stateowner *
999alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1000 struct nfs4_stateowner *sop;
1001 struct nfs4_replay *rp;
1002 unsigned int idhashval;
1003
1004 if (!(sop = alloc_stateowner(&open->op_owner)))
1005 return NULL;
1006 idhashval = ownerid_hashval(current_ownerid);
1007 INIT_LIST_HEAD(&sop->so_idhash);
1008 INIT_LIST_HEAD(&sop->so_strhash);
1009 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07001010 INIT_LIST_HEAD(&sop->so_stateids);
1011 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 INIT_LIST_HEAD(&sop->so_close_lru);
1013 sop->so_time = 0;
1014 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1015 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07001016 list_add(&sop->so_perclient, &clp->cl_openowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 sop->so_is_open_owner = 1;
1018 sop->so_id = current_ownerid++;
1019 sop->so_client = clp;
1020 sop->so_seqid = open->op_seqid;
1021 sop->so_confirmed = 0;
1022 rp = &sop->so_replay;
Al Virode1ae282006-01-18 17:43:47 -08001023 rp->rp_status = nfserr_serverfault;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 rp->rp_buflen = 0;
1025 rp->rp_buf = rp->rp_ibuf;
1026 return sop;
1027}
1028
1029static void
1030release_stateid_lockowners(struct nfs4_stateid *open_stp)
1031{
1032 struct nfs4_stateowner *lock_sop;
1033
NeilBrownea1da632005-06-23 22:04:17 -07001034 while (!list_empty(&open_stp->st_lockowners)) {
1035 lock_sop = list_entry(open_stp->st_lockowners.next,
1036 struct nfs4_stateowner, so_perstateid);
1037 /* list_del(&open_stp->st_lockowners); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 BUG_ON(lock_sop->so_is_open_owner);
1039 release_stateowner(lock_sop);
1040 }
1041}
1042
1043static void
1044unhash_stateowner(struct nfs4_stateowner *sop)
1045{
1046 struct nfs4_stateid *stp;
1047
1048 list_del(&sop->so_idhash);
1049 list_del(&sop->so_strhash);
NeilBrown6fa305d2005-06-23 22:03:06 -07001050 if (sop->so_is_open_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 list_del(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07001052 list_del(&sop->so_perstateid);
1053 while (!list_empty(&sop->so_stateids)) {
1054 stp = list_entry(sop->so_stateids.next,
1055 struct nfs4_stateid, st_perstateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 if (sop->so_is_open_owner)
1057 release_stateid(stp, OPEN_STATE);
1058 else
1059 release_stateid(stp, LOCK_STATE);
1060 }
1061}
1062
1063static void
1064release_stateowner(struct nfs4_stateowner *sop)
1065{
1066 unhash_stateowner(sop);
1067 list_del(&sop->so_close_lru);
1068 nfs4_put_stateowner(sop);
1069}
1070
1071static inline void
1072init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1073 struct nfs4_stateowner *sop = open->op_stateowner;
1074 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1075
1076 INIT_LIST_HEAD(&stp->st_hash);
NeilBrownea1da632005-06-23 22:04:17 -07001077 INIT_LIST_HEAD(&stp->st_perstateowner);
1078 INIT_LIST_HEAD(&stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 INIT_LIST_HEAD(&stp->st_perfile);
1080 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
NeilBrownea1da632005-06-23 22:04:17 -07001081 list_add(&stp->st_perstateowner, &sop->so_stateids);
NeilBrown8beefa22005-06-23 22:03:08 -07001082 list_add(&stp->st_perfile, &fp->fi_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07001084 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 stp->st_file = fp;
1086 stp->st_stateid.si_boot = boot_time;
1087 stp->st_stateid.si_stateownerid = sop->so_id;
1088 stp->st_stateid.si_fileid = fp->fi_id;
1089 stp->st_stateid.si_generation = 0;
1090 stp->st_access_bmap = 0;
1091 stp->st_deny_bmap = 0;
1092 __set_bit(open->op_share_access, &stp->st_access_bmap);
1093 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
NeilBrown4c4cd222005-07-07 17:59:27 -07001094 stp->st_openstp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095}
1096
1097static void
1098release_stateid(struct nfs4_stateid *stp, int flags)
1099{
1100 struct file *filp = stp->st_vfs_file;
1101
1102 list_del(&stp->st_hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 list_del(&stp->st_perfile);
NeilBrownea1da632005-06-23 22:04:17 -07001104 list_del(&stp->st_perstateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 if (flags & OPEN_STATE) {
1106 release_stateid_lockowners(stp);
1107 stp->st_vfs_file = NULL;
1108 nfsd_close(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 } else if (flags & LOCK_STATE)
1110 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
NeilBrown13cd2182005-06-23 22:03:10 -07001111 put_nfs4_file(stp->st_file);
NeilBrown5ac049a2005-06-23 22:03:03 -07001112 kmem_cache_free(stateid_slab, stp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113}
1114
NeilBrownfd39ca92005-06-23 22:04:03 -07001115static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116move_to_close_lru(struct nfs4_stateowner *sop)
1117{
1118 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1119
NeilBrown358dd552006-04-10 22:55:42 -07001120 list_move_tail(&sop->so_close_lru, &close_lru);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 sop->so_time = get_seconds();
1122}
1123
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124static int
J. Bruce Fields599e0a22007-07-26 17:04:54 -04001125same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1126 clientid_t *clid)
1127{
1128 return (sop->so_owner.len == owner->len) &&
1129 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1130 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131}
1132
1133static struct nfs4_stateowner *
1134find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1135{
1136 struct nfs4_stateowner *so = NULL;
1137
1138 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
J. Bruce Fields599e0a22007-07-26 17:04:54 -04001139 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 return so;
1141 }
1142 return NULL;
1143}
1144
1145/* search file_hashtbl[] for file */
1146static struct nfs4_file *
1147find_file(struct inode *ino)
1148{
1149 unsigned int hashval = file_hashval(ino);
1150 struct nfs4_file *fp;
1151
1152 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
NeilBrown13cd2182005-06-23 22:03:10 -07001153 if (fp->fi_inode == ino) {
1154 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 return fp;
NeilBrown13cd2182005-06-23 22:03:10 -07001156 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 }
1158 return NULL;
1159}
1160
J. Bruce Fields8838dc42008-01-14 13:12:19 -05001161static inline int access_valid(u32 x)
J. Bruce Fieldsba5a6a12006-06-30 01:56:16 -07001162{
J. Bruce Fields8838dc42008-01-14 13:12:19 -05001163 if (x < NFS4_SHARE_ACCESS_READ)
1164 return 0;
1165 if (x > NFS4_SHARE_ACCESS_BOTH)
1166 return 0;
1167 return 1;
J. Bruce Fieldsba5a6a12006-06-30 01:56:16 -07001168}
1169
J. Bruce Fields8838dc42008-01-14 13:12:19 -05001170static inline int deny_valid(u32 x)
J. Bruce Fieldsba5a6a12006-06-30 01:56:16 -07001171{
J. Bruce Fields8838dc42008-01-14 13:12:19 -05001172 /* Note: unlike access bits, deny bits may be zero. */
1173 return x <= NFS4_SHARE_DENY_BOTH;
J. Bruce Fieldsba5a6a12006-06-30 01:56:16 -07001174}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
NeilBrownfd39ca92005-06-23 22:04:03 -07001176static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177set_access(unsigned int *access, unsigned long bmap) {
1178 int i;
1179
1180 *access = 0;
1181 for (i = 1; i < 4; i++) {
1182 if (test_bit(i, &bmap))
1183 *access |= i;
1184 }
1185}
1186
NeilBrownfd39ca92005-06-23 22:04:03 -07001187static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188set_deny(unsigned int *deny, unsigned long bmap) {
1189 int i;
1190
1191 *deny = 0;
1192 for (i = 0; i < 4; i++) {
1193 if (test_bit(i, &bmap))
1194 *deny |= i ;
1195 }
1196}
1197
1198static int
1199test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1200 unsigned int access, deny;
1201
1202 set_access(&access, stp->st_access_bmap);
1203 set_deny(&deny, stp->st_deny_bmap);
1204 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1205 return 0;
1206 return 1;
1207}
1208
1209/*
1210 * Called to check deny when READ with all zero stateid or
1211 * WRITE with all zero or all one stateid
1212 */
Al Virob37ad282006-10-19 23:28:59 -07001213static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1215{
1216 struct inode *ino = current_fh->fh_dentry->d_inode;
1217 struct nfs4_file *fp;
1218 struct nfs4_stateid *stp;
Al Virob37ad282006-10-19 23:28:59 -07001219 __be32 ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
1221 dprintk("NFSD: nfs4_share_conflict\n");
1222
1223 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07001224 if (!fp)
1225 return nfs_ok;
NeilBrownb7009492005-07-07 17:59:23 -07001226 ret = nfserr_locked;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 /* Search for conflicting share reservations */
NeilBrown13cd2182005-06-23 22:03:10 -07001228 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1229 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1230 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1231 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 }
NeilBrown13cd2182005-06-23 22:03:10 -07001233 ret = nfs_ok;
1234out:
1235 put_nfs4_file(fp);
1236 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237}
1238
1239static inline void
1240nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1241{
1242 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
Dave Hansenaceaf782008-02-15 14:37:31 -08001243 drop_file_write_access(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1245 }
1246}
1247
1248/*
1249 * Recall a delegation
1250 */
1251static int
1252do_recall(void *__dp)
1253{
1254 struct nfs4_delegation *dp = __dp;
1255
Meelap Shah47f99402007-07-17 04:04:40 -07001256 dp->dl_file->fi_had_conflict = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 nfsd4_cb_recall(dp);
1258 return 0;
1259}
1260
1261/*
1262 * Spawn a thread to perform a recall on the delegation represented
1263 * by the lease (file_lock)
1264 *
1265 * Called from break_lease() with lock_kernel() held.
1266 * Note: we assume break_lease will only call this *once* for any given
1267 * lease.
1268 */
1269static
1270void nfsd_break_deleg_cb(struct file_lock *fl)
1271{
1272 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1273 struct task_struct *t;
1274
1275 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1276 if (!dp)
1277 return;
1278
1279 /* We're assuming the state code never drops its reference
1280 * without first removing the lease. Since we're in this lease
1281 * callback (and since the lease code is serialized by the kernel
1282 * lock) we know the server hasn't removed the lease yet, we know
1283 * it's safe to take a reference: */
1284 atomic_inc(&dp->dl_count);
J. Bruce Fieldscfdcad42007-09-12 20:35:15 -04001285 atomic_inc(&dp->dl_client->cl_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
1287 spin_lock(&recall_lock);
1288 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1289 spin_unlock(&recall_lock);
1290
1291 /* only place dl_time is set. protected by lock_kernel*/
1292 dp->dl_time = get_seconds();
1293
J. Bruce Fields0272e1f2007-09-12 18:56:12 -04001294 /*
1295 * We don't want the locks code to timeout the lease for us;
1296 * we'll remove it ourself if the delegation isn't returned
1297 * in time.
1298 */
1299 fl->fl_break_time = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
1301 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1302 if (IS_ERR(t)) {
1303 struct nfs4_client *clp = dp->dl_client;
1304
1305 printk(KERN_INFO "NFSD: Callback thread failed for "
1306 "for client (clientid %08x/%08x)\n",
1307 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
J. Bruce Fieldscfdcad42007-09-12 20:35:15 -04001308 put_nfs4_client(dp->dl_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 nfs4_put_delegation(dp);
1310 }
1311}
1312
1313/*
1314 * The file_lock is being reapd.
1315 *
1316 * Called by locks_free_lock() with lock_kernel() held.
1317 */
1318static
1319void nfsd_release_deleg_cb(struct file_lock *fl)
1320{
1321 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1322
1323 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1324
1325 if (!(fl->fl_flags & FL_LEASE) || !dp)
1326 return;
1327 dp->dl_flock = NULL;
1328}
1329
1330/*
1331 * Set the delegation file_lock back pointer.
1332 *
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -04001333 * Called from setlease() with lock_kernel() held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 */
1335static
1336void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1337{
1338 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1339
1340 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1341 if (!dp)
1342 return;
1343 dp->dl_flock = new;
1344}
1345
1346/*
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -04001347 * Called from setlease() with lock_kernel() held
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 */
1349static
1350int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1351{
1352 struct nfs4_delegation *onlistd =
1353 (struct nfs4_delegation *)onlist->fl_owner;
1354 struct nfs4_delegation *tryd =
1355 (struct nfs4_delegation *)try->fl_owner;
1356
1357 if (onlist->fl_lmops != try->fl_lmops)
1358 return 0;
1359
1360 return onlistd->dl_client == tryd->dl_client;
1361}
1362
1363
1364static
1365int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1366{
1367 if (arg & F_UNLCK)
1368 return lease_modify(onlist, arg);
1369 else
1370 return -EAGAIN;
1371}
1372
NeilBrownfd39ca92005-06-23 22:04:03 -07001373static struct lock_manager_operations nfsd_lease_mng_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 .fl_break = nfsd_break_deleg_cb,
1375 .fl_release_private = nfsd_release_deleg_cb,
1376 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1377 .fl_mylease = nfsd_same_client_deleg_cb,
1378 .fl_change = nfsd_change_deleg_cb,
1379};
1380
1381
Al Virob37ad282006-10-19 23:28:59 -07001382__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383nfsd4_process_open1(struct nfsd4_open *open)
1384{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 clientid_t *clientid = &open->op_clientid;
1386 struct nfs4_client *clp = NULL;
1387 unsigned int strhashval;
1388 struct nfs4_stateowner *sop = NULL;
1389
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 if (!check_name(open->op_owner))
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001391 return nfserr_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
1393 if (STALE_CLIENTID(&open->op_clientid))
1394 return nfserr_stale_clientid;
1395
1396 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1397 sop = find_openstateowner_str(strhashval, open);
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001398 open->op_stateowner = sop;
1399 if (!sop) {
1400 /* Make sure the client's lease hasn't expired. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 clp = find_confirmed_client(clientid);
1402 if (clp == NULL)
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001403 return nfserr_expired;
1404 goto renew;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 }
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001406 if (!sop->so_confirmed) {
1407 /* Replace unconfirmed owners without checking for replay. */
1408 clp = sop->so_client;
1409 release_stateowner(sop);
1410 open->op_stateowner = NULL;
1411 goto renew;
1412 }
1413 if (open->op_seqid == sop->so_seqid - 1) {
1414 if (sop->so_replay.rp_buflen)
Al Viroa90b0612006-10-19 23:29:03 -07001415 return nfserr_replay_me;
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001416 /* The original OPEN failed so spectacularly
1417 * that we don't even have replay data saved!
1418 * Therefore, we have no choice but to continue
1419 * processing this OPEN; presumably, we'll
1420 * fail again for the same reason.
1421 */
1422 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1423 goto renew;
1424 }
1425 if (open->op_seqid != sop->so_seqid)
1426 return nfserr_bad_seqid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427renew:
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001428 if (open->op_stateowner == NULL) {
1429 sop = alloc_init_open_stateowner(strhashval, clp, open);
1430 if (sop == NULL)
1431 return nfserr_resource;
1432 open->op_stateowner = sop;
1433 }
1434 list_del_init(&sop->so_close_lru);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 renew_client(sop->so_client);
J. Bruce Fields0f442aa2006-01-18 17:43:34 -08001436 return nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437}
1438
Al Virob37ad282006-10-19 23:28:59 -07001439static inline __be32
NeilBrown4a6e43e2005-06-23 22:02:50 -07001440nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1441{
1442 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1443 return nfserr_openmode;
1444 else
1445 return nfs_ok;
1446}
1447
NeilBrown52f4fb42005-06-23 22:02:49 -07001448static struct nfs4_delegation *
1449find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1450{
1451 struct nfs4_delegation *dp;
1452
NeilBrownea1da632005-06-23 22:04:17 -07001453 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
NeilBrown52f4fb42005-06-23 22:02:49 -07001454 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1455 return dp;
1456 }
1457 return NULL;
1458}
1459
Al Virob37ad282006-10-19 23:28:59 -07001460static __be32
NeilBrown567d9822005-06-23 22:02:53 -07001461nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1462 struct nfs4_delegation **dp)
1463{
1464 int flags;
Al Virob37ad282006-10-19 23:28:59 -07001465 __be32 status = nfserr_bad_stateid;
NeilBrown567d9822005-06-23 22:02:53 -07001466
1467 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1468 if (*dp == NULL)
NeilBrownc44c5ee2005-06-23 22:02:54 -07001469 goto out;
NeilBrown567d9822005-06-23 22:02:53 -07001470 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1471 RD_STATE : WR_STATE;
1472 status = nfs4_check_delegmode(*dp, flags);
1473 if (status)
1474 *dp = NULL;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001475out:
1476 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1477 return nfs_ok;
1478 if (status)
1479 return status;
1480 open->op_stateowner->so_confirmed = 1;
1481 return nfs_ok;
NeilBrown567d9822005-06-23 22:02:53 -07001482}
1483
Al Virob37ad282006-10-19 23:28:59 -07001484static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1486{
1487 struct nfs4_stateid *local;
Al Virob37ad282006-10-19 23:28:59 -07001488 __be32 status = nfserr_share_denied;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 struct nfs4_stateowner *sop = open->op_stateowner;
1490
NeilBrown8beefa22005-06-23 22:03:08 -07001491 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 /* ignore lock owners */
1493 if (local->st_stateowner->so_is_open_owner == 0)
1494 continue;
1495 /* remember if we have seen this open owner */
1496 if (local->st_stateowner == sop)
1497 *stpp = local;
1498 /* check for conflicting share reservations */
1499 if (!test_share(local, open))
1500 goto out;
1501 }
1502 status = 0;
1503out:
1504 return status;
1505}
1506
NeilBrown5ac049a2005-06-23 22:03:03 -07001507static inline struct nfs4_stateid *
1508nfs4_alloc_stateid(void)
1509{
1510 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1511}
1512
Al Virob37ad282006-10-19 23:28:59 -07001513static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
NeilBrown567d9822005-06-23 22:02:53 -07001515 struct nfs4_delegation *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 struct svc_fh *cur_fh, int flags)
1517{
1518 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519
NeilBrown5ac049a2005-06-23 22:03:03 -07001520 stp = nfs4_alloc_stateid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 if (stp == NULL)
1522 return nfserr_resource;
1523
NeilBrown567d9822005-06-23 22:02:53 -07001524 if (dp) {
1525 get_file(dp->dl_vfs_file);
1526 stp->st_vfs_file = dp->dl_vfs_file;
1527 } else {
Al Virob37ad282006-10-19 23:28:59 -07001528 __be32 status;
NeilBrown567d9822005-06-23 22:02:53 -07001529 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1530 &stp->st_vfs_file);
1531 if (status) {
1532 if (status == nfserr_dropit)
1533 status = nfserr_jukebox;
NeilBrown5ac049a2005-06-23 22:03:03 -07001534 kmem_cache_free(stateid_slab, stp);
NeilBrown567d9822005-06-23 22:02:53 -07001535 return status;
1536 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 *stpp = stp;
1539 return 0;
1540}
1541
Al Virob37ad282006-10-19 23:28:59 -07001542static inline __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1544 struct nfsd4_open *open)
1545{
1546 struct iattr iattr = {
1547 .ia_valid = ATTR_SIZE,
1548 .ia_size = 0,
1549 };
1550 if (!open->op_truncate)
1551 return 0;
1552 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
Al Viro92465852006-01-18 17:43:46 -08001553 return nfserr_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1555}
1556
Al Virob37ad282006-10-19 23:28:59 -07001557static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1559{
1560 struct file *filp = stp->st_vfs_file;
Josef "Jeff" Sipek7eaa36e2006-12-08 02:36:41 -08001561 struct inode *inode = filp->f_path.dentry->d_inode;
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001562 unsigned int share_access, new_writer;
Al Virob37ad282006-10-19 23:28:59 -07001563 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
1565 set_access(&share_access, stp->st_access_bmap);
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001566 new_writer = (~share_access) & open->op_share_access
1567 & NFS4_SHARE_ACCESS_WRITE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001569 if (new_writer) {
Al Virob37ad282006-10-19 23:28:59 -07001570 int err = get_write_access(inode);
1571 if (err)
1572 return nfserrno(err);
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001573 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 status = nfsd4_truncate(rqstp, cur_fh, open);
1575 if (status) {
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001576 if (new_writer)
1577 put_write_access(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 return status;
1579 }
1580 /* remember the open */
J. Bruce Fields6c26d082006-01-18 17:43:38 -08001581 filp->f_mode |= open->op_share_access;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 set_bit(open->op_share_access, &stp->st_access_bmap);
1583 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1584
1585 return nfs_ok;
1586}
1587
1588
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589static void
NeilBrown37515172005-07-07 17:59:16 -07001590nfs4_set_claim_prev(struct nfsd4_open *open)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591{
NeilBrown37515172005-07-07 17:59:16 -07001592 open->op_stateowner->so_confirmed = 1;
1593 open->op_stateowner->so_client->cl_firststate = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594}
1595
1596/*
1597 * Attempt to hand out a delegation.
1598 */
1599static void
1600nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1601{
1602 struct nfs4_delegation *dp;
1603 struct nfs4_stateowner *sop = stp->st_stateowner;
1604 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1605 struct file_lock fl, *flp = &fl;
1606 int status, flag = 0;
1607
1608 flag = NFS4_OPEN_DELEGATE_NONE;
NeilBrown7b190fe2005-06-23 22:03:23 -07001609 open->op_recall = 0;
1610 switch (open->op_claim_type) {
1611 case NFS4_OPEN_CLAIM_PREVIOUS:
1612 if (!atomic_read(&cb->cb_set))
1613 open->op_recall = 1;
1614 flag = open->op_delegate_type;
1615 if (flag == NFS4_OPEN_DELEGATE_NONE)
1616 goto out;
1617 break;
1618 case NFS4_OPEN_CLAIM_NULL:
1619 /* Let's not give out any delegations till everyone's
1620 * had the chance to reclaim theirs.... */
1621 if (nfs4_in_grace())
1622 goto out;
1623 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1624 goto out;
1625 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1626 flag = NFS4_OPEN_DELEGATE_WRITE;
1627 else
1628 flag = NFS4_OPEN_DELEGATE_READ;
1629 break;
1630 default:
1631 goto out;
1632 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633
1634 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1635 if (dp == NULL) {
1636 flag = NFS4_OPEN_DELEGATE_NONE;
1637 goto out;
1638 }
1639 locks_init_lock(&fl);
1640 fl.fl_lmops = &nfsd_lease_mng_ops;
1641 fl.fl_flags = FL_LEASE;
Felix Blyakher9167f502008-02-26 10:54:36 -08001642 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 fl.fl_end = OFFSET_MAX;
1644 fl.fl_owner = (fl_owner_t)dp;
1645 fl.fl_file = stp->st_vfs_file;
1646 fl.fl_pid = current->tgid;
1647
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -04001648 /* vfs_setlease checks to see if delegation should be handed out.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 * the lock_manager callbacks fl_mylease and fl_change are used
1650 */
Felix Blyakher9167f502008-02-26 10:54:36 -08001651 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
NeilBrownc9071322005-04-16 15:26:38 -07001653 unhash_delegation(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 flag = NFS4_OPEN_DELEGATE_NONE;
1655 goto out;
1656 }
1657
1658 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1659
1660 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1661 dp->dl_stateid.si_boot,
1662 dp->dl_stateid.si_stateownerid,
1663 dp->dl_stateid.si_fileid,
1664 dp->dl_stateid.si_generation);
1665out:
NeilBrown7b190fe2005-06-23 22:03:23 -07001666 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1667 && flag == NFS4_OPEN_DELEGATE_NONE
1668 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
J. Bruce Fields2fdada02007-07-27 16:10:37 -04001669 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 open->op_delegate_type = flag;
1671}
1672
1673/*
1674 * called with nfs4_lock_state() held.
1675 */
Al Virob37ad282006-10-19 23:28:59 -07001676__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1678{
1679 struct nfs4_file *fp = NULL;
1680 struct inode *ino = current_fh->fh_dentry->d_inode;
1681 struct nfs4_stateid *stp = NULL;
NeilBrown567d9822005-06-23 22:02:53 -07001682 struct nfs4_delegation *dp = NULL;
Al Virob37ad282006-10-19 23:28:59 -07001683 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684
1685 status = nfserr_inval;
J. Bruce Fieldsba5a6a12006-06-30 01:56:16 -07001686 if (!access_valid(open->op_share_access)
1687 || !deny_valid(open->op_share_deny))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 goto out;
1689 /*
1690 * Lookup file; if found, lookup stateid and check open request,
1691 * and check for delegations in the process of being recalled.
1692 * If not found, create the nfs4_file struct
1693 */
1694 fp = find_file(ino);
1695 if (fp) {
1696 if ((status = nfs4_check_open(fp, open, &stp)))
1697 goto out;
NeilBrownc44c5ee2005-06-23 22:02:54 -07001698 status = nfs4_check_deleg(fp, open, &dp);
1699 if (status)
1700 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 } else {
NeilBrownc44c5ee2005-06-23 22:02:54 -07001702 status = nfserr_bad_stateid;
1703 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1704 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 status = nfserr_resource;
1706 fp = alloc_init_file(ino);
1707 if (fp == NULL)
1708 goto out;
1709 }
1710
1711 /*
1712 * OPEN the file, or upgrade an existing OPEN.
1713 * If truncate fails, the OPEN fails.
1714 */
1715 if (stp) {
1716 /* Stateid was found, this is an OPEN upgrade */
1717 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1718 if (status)
1719 goto out;
NeilBrown444c2c02005-07-07 17:59:22 -07001720 update_stateid(&stp->st_stateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 } else {
1722 /* Stateid was not found, this is a new OPEN */
1723 int flags = 0;
J. Bruce Fields9ecb6a02006-06-30 01:56:17 -07001724 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1725 flags |= MAY_READ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
J. Bruce Fields9ecb6a02006-06-30 01:56:17 -07001727 flags |= MAY_WRITE;
NeilBrown567d9822005-06-23 22:02:53 -07001728 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1729 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 goto out;
1731 init_stateid(stp, fp, open);
1732 status = nfsd4_truncate(rqstp, current_fh, open);
1733 if (status) {
1734 release_stateid(stp, OPEN_STATE);
1735 goto out;
1736 }
1737 }
1738 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1739
1740 /*
1741 * Attempt to hand out a delegation. No error return, because the
1742 * OPEN succeeds even if we fail.
1743 */
1744 nfs4_open_delegation(current_fh, open, stp);
1745
1746 status = nfs_ok;
1747
1748 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1749 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1750 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1751out:
NeilBrown13cd2182005-06-23 22:03:10 -07001752 if (fp)
1753 put_nfs4_file(fp);
NeilBrown37515172005-07-07 17:59:16 -07001754 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1755 nfs4_set_claim_prev(open);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 /*
1757 * To finish the open response, we just need to set the rflags.
1758 */
1759 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1760 if (!open->op_stateowner->so_confirmed)
1761 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1762
1763 return status;
1764}
1765
Al Virob37ad282006-10-19 23:28:59 -07001766__be32
J.Bruce Fieldsb5914802006-12-13 00:35:38 -08001767nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1768 clientid_t *clid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769{
1770 struct nfs4_client *clp;
Al Virob37ad282006-10-19 23:28:59 -07001771 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772
1773 nfs4_lock_state();
1774 dprintk("process_renew(%08x/%08x): starting\n",
1775 clid->cl_boot, clid->cl_id);
1776 status = nfserr_stale_clientid;
1777 if (STALE_CLIENTID(clid))
1778 goto out;
1779 clp = find_confirmed_client(clid);
1780 status = nfserr_expired;
1781 if (clp == NULL) {
1782 /* We assume the client took too long to RENEW. */
1783 dprintk("nfsd4_renew: clientid not found!\n");
1784 goto out;
1785 }
1786 renew_client(clp);
1787 status = nfserr_cb_path_down;
NeilBrownea1da632005-06-23 22:04:17 -07001788 if (!list_empty(&clp->cl_delegations)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 && !atomic_read(&clp->cl_callback.cb_set))
1790 goto out;
1791 status = nfs_ok;
1792out:
1793 nfs4_unlock_state();
1794 return status;
1795}
1796
NeilBrowna76b4312005-06-23 22:04:01 -07001797static void
1798end_grace(void)
1799{
1800 dprintk("NFSD: end of grace period\n");
NeilBrownc7b9a452005-06-23 22:04:30 -07001801 nfsd4_recdir_purge_old();
NeilBrowna76b4312005-06-23 22:04:01 -07001802 in_grace = 0;
1803}
1804
NeilBrownfd39ca92005-06-23 22:04:03 -07001805static time_t
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806nfs4_laundromat(void)
1807{
1808 struct nfs4_client *clp;
1809 struct nfs4_stateowner *sop;
1810 struct nfs4_delegation *dp;
1811 struct list_head *pos, *next, reaplist;
1812 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1813 time_t t, clientid_val = NFSD_LEASE_TIME;
1814 time_t u, test_val = NFSD_LEASE_TIME;
1815
1816 nfs4_lock_state();
1817
1818 dprintk("NFSD: laundromat service - starting\n");
NeilBrowna76b4312005-06-23 22:04:01 -07001819 if (in_grace)
1820 end_grace();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 list_for_each_safe(pos, next, &client_lru) {
1822 clp = list_entry(pos, struct nfs4_client, cl_lru);
1823 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1824 t = clp->cl_time - cutoff;
1825 if (clientid_val > t)
1826 clientid_val = t;
1827 break;
1828 }
1829 dprintk("NFSD: purging unused client (clientid %08x)\n",
1830 clp->cl_clientid.cl_id);
NeilBrownc7b9a452005-06-23 22:04:30 -07001831 nfsd4_remove_clid_dir(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 expire_client(clp);
1833 }
1834 INIT_LIST_HEAD(&reaplist);
1835 spin_lock(&recall_lock);
1836 list_for_each_safe(pos, next, &del_recall_lru) {
1837 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1838 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1839 u = dp->dl_time - cutoff;
1840 if (test_val > u)
1841 test_val = u;
1842 break;
1843 }
1844 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1845 dp, dp->dl_flock);
1846 list_move(&dp->dl_recall_lru, &reaplist);
1847 }
1848 spin_unlock(&recall_lock);
1849 list_for_each_safe(pos, next, &reaplist) {
1850 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1851 list_del_init(&dp->dl_recall_lru);
1852 unhash_delegation(dp);
1853 }
1854 test_val = NFSD_LEASE_TIME;
1855 list_for_each_safe(pos, next, &close_lru) {
1856 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1857 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1858 u = sop->so_time - cutoff;
1859 if (test_val > u)
1860 test_val = u;
1861 break;
1862 }
1863 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1864 sop->so_id);
NeilBrown358dd552006-04-10 22:55:42 -07001865 release_stateowner(sop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 }
1867 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1868 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1869 nfs4_unlock_state();
1870 return clientid_val;
1871}
1872
Harvey Harrisona254b242008-02-20 12:49:00 -08001873static struct workqueue_struct *laundry_wq;
1874static void laundromat_main(struct work_struct *);
1875static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1876
1877static void
David Howellsc4028952006-11-22 14:57:56 +00001878laundromat_main(struct work_struct *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879{
1880 time_t t;
1881
1882 t = nfs4_laundromat();
1883 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
NeilBrown58da2822005-06-23 22:03:19 -07001884 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885}
1886
NeilBrownfd39ca92005-06-23 22:04:03 -07001887static struct nfs4_stateowner *
NeilBrownf8816512005-07-07 17:59:25 -07001888search_close_lru(u32 st_id, int flags)
1889{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 struct nfs4_stateowner *local = NULL;
1891
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 if (flags & CLOSE_STATE) {
1893 list_for_each_entry(local, &close_lru, so_close_lru) {
1894 if (local->so_id == st_id)
1895 return local;
1896 }
1897 }
1898 return NULL;
1899}
1900
1901static inline int
1902nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1903{
Josef "Jeff" Sipek7eaa36e2006-12-08 02:36:41 -08001904 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905}
1906
1907static int
1908STALE_STATEID(stateid_t *stateid)
1909{
1910 if (stateid->si_boot == boot_time)
1911 return 0;
Neil Brown849823c2005-09-13 01:25:36 -07001912 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1914 stateid->si_generation);
1915 return 1;
1916}
1917
1918static inline int
1919access_permit_read(unsigned long access_bmap)
1920{
1921 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1922 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1923 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1924}
1925
1926static inline int
1927access_permit_write(unsigned long access_bmap)
1928{
1929 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1930 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1931}
1932
1933static
Al Virob37ad282006-10-19 23:28:59 -07001934__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935{
Al Virob37ad282006-10-19 23:28:59 -07001936 __be32 status = nfserr_openmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937
1938 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1939 goto out;
1940 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1941 goto out;
1942 status = nfs_ok;
1943out:
1944 return status;
1945}
1946
Al Virob37ad282006-10-19 23:28:59 -07001947static inline __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1949{
1950 /* Trying to call delegreturn with a special stateid? Yuch: */
1951 if (!(flags & (RD_STATE | WR_STATE)))
1952 return nfserr_bad_stateid;
1953 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1954 return nfs_ok;
1955 else if (nfs4_in_grace()) {
1956 /* Answer in remaining cases depends on existance of
1957 * conflicting state; so we must wait out the grace period. */
1958 return nfserr_grace;
1959 } else if (flags & WR_STATE)
1960 return nfs4_share_conflict(current_fh,
1961 NFS4_SHARE_DENY_WRITE);
1962 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1963 return nfs4_share_conflict(current_fh,
1964 NFS4_SHARE_DENY_READ);
1965}
1966
1967/*
1968 * Allow READ/WRITE during grace period on recovered state only for files
1969 * that are not able to provide mandatory locking.
1970 */
1971static inline int
1972io_during_grace_disallowed(struct inode *inode, int flags)
1973{
1974 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001975 && mandatory_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976}
1977
J. Bruce Fields0836f582008-01-26 19:08:12 -05001978static int check_stateid_generation(stateid_t *in, stateid_t *ref)
1979{
1980 /* If the client sends us a stateid from the future, it's buggy: */
1981 if (in->si_generation > ref->si_generation)
1982 return nfserr_bad_stateid;
1983 /*
1984 * The following, however, can happen. For example, if the
1985 * client sends an open and some IO at the same time, the open
1986 * may bump si_generation while the IO is still in flight.
1987 * Thanks to hard links and renames, the client never knows what
1988 * file an open will affect. So it could avoid that situation
1989 * only by serializing all opens and IO from the same open
1990 * owner. To recover from the old_stateid error, the client
1991 * will just have to retry the IO:
1992 */
1993 if (in->si_generation < ref->si_generation)
1994 return nfserr_old_stateid;
1995 return nfs_ok;
1996}
1997
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998/*
1999* Checks for stateid operations
2000*/
Al Virob37ad282006-10-19 23:28:59 -07002001__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2003{
2004 struct nfs4_stateid *stp = NULL;
2005 struct nfs4_delegation *dp = NULL;
2006 stateid_t *stidp;
2007 struct inode *ino = current_fh->fh_dentry->d_inode;
Al Virob37ad282006-10-19 23:28:59 -07002008 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009
2010 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2011 stateid->si_boot, stateid->si_stateownerid,
2012 stateid->si_fileid, stateid->si_generation);
2013 if (filpp)
2014 *filpp = NULL;
2015
2016 if (io_during_grace_disallowed(ino, flags))
2017 return nfserr_grace;
2018
2019 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2020 return check_special_stateids(current_fh, stateid, flags);
2021
2022 /* STALE STATEID */
2023 status = nfserr_stale_stateid;
2024 if (STALE_STATEID(stateid))
2025 goto out;
2026
2027 /* BAD STATEID */
2028 status = nfserr_bad_stateid;
2029 if (!stateid->si_fileid) { /* delegation stateid */
2030 if(!(dp = find_delegation_stateid(ino, stateid))) {
2031 dprintk("NFSD: delegation stateid not found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 goto out;
2033 }
2034 stidp = &dp->dl_stateid;
2035 } else { /* open or lock stateid */
2036 if (!(stp = find_stateid(stateid, flags))) {
2037 dprintk("NFSD: open or lock stateid not found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 goto out;
2039 }
2040 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2041 goto out;
2042 if (!stp->st_stateowner->so_confirmed)
2043 goto out;
2044 stidp = &stp->st_stateid;
2045 }
J. Bruce Fields0836f582008-01-26 19:08:12 -05002046 status = check_stateid_generation(stateid, stidp);
2047 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 goto out;
2049 if (stp) {
2050 if ((status = nfs4_check_openmode(stp,flags)))
2051 goto out;
2052 renew_client(stp->st_stateowner->so_client);
2053 if (filpp)
2054 *filpp = stp->st_vfs_file;
J. Bruce Fields6a85fa32008-01-26 23:36:48 -05002055 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 if ((status = nfs4_check_delegmode(dp, flags)))
2057 goto out;
2058 renew_client(dp->dl_client);
2059 if (flags & DELEG_RET)
2060 unhash_delegation(dp);
2061 if (filpp)
2062 *filpp = dp->dl_vfs_file;
2063 }
2064 status = nfs_ok;
2065out:
2066 return status;
2067}
2068
NeilBrown4c4cd222005-07-07 17:59:27 -07002069static inline int
2070setlkflg (int type)
2071{
2072 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2073 RD_STATE : WR_STATE;
2074}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
2076/*
2077 * Checks for sequence id mutating operations.
2078 */
Al Virob37ad282006-10-19 23:28:59 -07002079static __be32
NeilBrown4c4cd222005-07-07 17:59:27 -07002080nfs4_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 -07002081{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 struct nfs4_stateid *stp;
2083 struct nfs4_stateowner *sop;
J. Bruce Fields0836f582008-01-26 19:08:12 -05002084 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085
2086 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2087 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2088 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2089 stateid->si_generation);
NeilBrown3a4f98b2005-07-07 17:59:26 -07002090
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 *stpp = NULL;
2092 *sopp = NULL;
2093
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
J. Bruce Fields2fdada02007-07-27 16:10:37 -04002095 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
NeilBrown3a4f98b2005-07-07 17:59:26 -07002096 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 }
2098
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 if (STALE_STATEID(stateid))
NeilBrown3a4f98b2005-07-07 17:59:26 -07002100 return nfserr_stale_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 /*
2102 * We return BAD_STATEID if filehandle doesn't match stateid,
2103 * the confirmed flag is incorrecly set, or the generation
2104 * number is incorrect.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 */
NeilBrownf8816512005-07-07 17:59:25 -07002106 stp = find_stateid(stateid, flags);
2107 if (stp == NULL) {
2108 /*
2109 * Also, we should make sure this isn't just the result of
2110 * a replayed close:
2111 */
2112 sop = search_close_lru(stateid->si_stateownerid, flags);
2113 if (sop == NULL)
2114 return nfserr_bad_stateid;
2115 *sopp = sop;
2116 goto check_replay;
2117 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118
J. Bruce Fields39325bd2007-11-26 17:06:39 -05002119 *stpp = stp;
2120 *sopp = sop = stp->st_stateowner;
2121
NeilBrown4c4cd222005-07-07 17:59:27 -07002122 if (lock) {
NeilBrown4c4cd222005-07-07 17:59:27 -07002123 clientid_t *lockclid = &lock->v.new.clientid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 struct nfs4_client *clp = sop->so_client;
NeilBrown4c4cd222005-07-07 17:59:27 -07002125 int lkflg = 0;
Al Virob37ad282006-10-19 23:28:59 -07002126 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127
NeilBrown4c4cd222005-07-07 17:59:27 -07002128 lkflg = setlkflg(lock->lk_type);
2129
2130 if (lock->lk_is_new) {
J. Bruce Fields599e0a22007-07-26 17:04:54 -04002131 if (!sop->so_is_open_owner)
2132 return nfserr_bad_stateid;
2133 if (!same_clid(&clp->cl_clientid, lockclid))
NeilBrown4c4cd222005-07-07 17:59:27 -07002134 return nfserr_bad_stateid;
J. Bruce Fields599e0a22007-07-26 17:04:54 -04002135 /* stp is the open stateid */
2136 status = nfs4_check_openmode(stp, lkflg);
2137 if (status)
2138 return status;
2139 } else {
2140 /* stp is the lock stateid */
2141 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2142 if (status)
2143 return status;
NeilBrown4c4cd222005-07-07 17:59:27 -07002144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 }
2146
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002147 if (nfs4_check_fh(current_fh, stp)) {
J. Bruce Fields2fdada02007-07-27 16:10:37 -04002148 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
NeilBrown3a4f98b2005-07-07 17:59:26 -07002149 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150 }
2151
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152 /*
2153 * We now validate the seqid and stateid generation numbers.
2154 * For the moment, we ignore the possibility of
2155 * generation number wraparound.
2156 */
NeilBrownbd9aac52005-07-07 17:59:19 -07002157 if (seqid != sop->so_seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 goto check_replay;
2159
NeilBrown3a4f98b2005-07-07 17:59:26 -07002160 if (sop->so_confirmed && flags & CONFIRM) {
J. Bruce Fields2fdada02007-07-27 16:10:37 -04002161 dprintk("NFSD: preprocess_seqid_op: expected"
NeilBrown3a4f98b2005-07-07 17:59:26 -07002162 " unconfirmed stateowner!\n");
2163 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 }
NeilBrown3a4f98b2005-07-07 17:59:26 -07002165 if (!sop->so_confirmed && !(flags & CONFIRM)) {
J. Bruce Fields2fdada02007-07-27 16:10:37 -04002166 dprintk("NFSD: preprocess_seqid_op: stateowner not"
NeilBrown3a4f98b2005-07-07 17:59:26 -07002167 " confirmed yet!\n");
2168 return nfserr_bad_stateid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169 }
J. Bruce Fields0836f582008-01-26 19:08:12 -05002170 status = check_stateid_generation(stateid, &stp->st_stateid);
2171 if (status)
2172 return status;
NeilBrown52fd0042005-07-07 17:59:24 -07002173 renew_client(sop->so_client);
NeilBrown3a4f98b2005-07-07 17:59:26 -07002174 return nfs_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175
Linus Torvalds1da177e2005-04-16 15:20:36 -07002176check_replay:
NeilBrownbd9aac52005-07-07 17:59:19 -07002177 if (seqid == sop->so_seqid - 1) {
Neil Brown849823c2005-09-13 01:25:36 -07002178 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 /* indicate replay to calling function */
Al Viroa90b0612006-10-19 23:29:03 -07002180 return nfserr_replay_me;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 }
J. Bruce Fields2fdada02007-07-27 16:10:37 -04002182 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
NeilBrown3a4f98b2005-07-07 17:59:26 -07002183 sop->so_seqid, seqid);
2184 *sopp = NULL;
2185 return nfserr_bad_seqid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186}
2187
Al Virob37ad282006-10-19 23:28:59 -07002188__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002189nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002190 struct nfsd4_open_confirm *oc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191{
Al Virob37ad282006-10-19 23:28:59 -07002192 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193 struct nfs4_stateowner *sop;
2194 struct nfs4_stateid *stp;
2195
2196 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002197 (int)cstate->current_fh.fh_dentry->d_name.len,
2198 cstate->current_fh.fh_dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002200 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
J. Bruce Fieldsa8cddc52006-06-30 01:56:13 -07002201 if (status)
2202 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203
2204 nfs4_lock_state();
2205
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002206 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2207 oc->oc_seqid, &oc->oc_req_stateid,
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002208 CONFIRM | OPEN_STATE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 &oc->oc_stateowner, &stp, NULL)))
2210 goto out;
2211
2212 sop = oc->oc_stateowner;
2213 sop->so_confirmed = 1;
2214 update_stateid(&stp->st_stateid);
2215 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2216 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2217 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2218 stp->st_stateid.si_boot,
2219 stp->st_stateid.si_stateownerid,
2220 stp->st_stateid.si_fileid,
2221 stp->st_stateid.si_generation);
NeilBrownc7b9a452005-06-23 22:04:30 -07002222
2223 nfsd4_create_clid_dir(sop->so_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224out:
Neil Brownf2327d92005-09-13 01:25:37 -07002225 if (oc->oc_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 nfs4_get_stateowner(oc->oc_stateowner);
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002227 cstate->replay_owner = oc->oc_stateowner;
Neil Brownf2327d92005-09-13 01:25:37 -07002228 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 nfs4_unlock_state();
2230 return status;
2231}
2232
2233
2234/*
2235 * unset all bits in union bitmap (bmap) that
2236 * do not exist in share (from successful OPEN_DOWNGRADE)
2237 */
2238static void
2239reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2240{
2241 int i;
2242 for (i = 1; i < 4; i++) {
2243 if ((i & access) != i)
2244 __clear_bit(i, bmap);
2245 }
2246}
2247
2248static void
2249reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2250{
2251 int i;
2252 for (i = 0; i < 4; i++) {
2253 if ((i & deny) != i)
2254 __clear_bit(i, bmap);
2255 }
2256}
2257
Al Virob37ad282006-10-19 23:28:59 -07002258__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002259nfsd4_open_downgrade(struct svc_rqst *rqstp,
2260 struct nfsd4_compound_state *cstate,
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002261 struct nfsd4_open_downgrade *od)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262{
Al Virob37ad282006-10-19 23:28:59 -07002263 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 struct nfs4_stateid *stp;
2265 unsigned int share_access;
2266
2267 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002268 (int)cstate->current_fh.fh_dentry->d_name.len,
2269 cstate->current_fh.fh_dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270
J. Bruce Fieldsba5a6a12006-06-30 01:56:16 -07002271 if (!access_valid(od->od_share_access)
2272 || !deny_valid(od->od_share_deny))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273 return nfserr_inval;
2274
2275 nfs4_lock_state();
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002276 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2277 od->od_seqid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278 &od->od_stateid,
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002279 OPEN_STATE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 &od->od_stateowner, &stp, NULL)))
2281 goto out;
2282
2283 status = nfserr_inval;
2284 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2285 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2286 stp->st_access_bmap, od->od_share_access);
2287 goto out;
2288 }
2289 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2290 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2291 stp->st_deny_bmap, od->od_share_deny);
2292 goto out;
2293 }
2294 set_access(&share_access, stp->st_access_bmap);
2295 nfs4_file_downgrade(stp->st_vfs_file,
2296 share_access & ~od->od_share_access);
2297
2298 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2299 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2300
2301 update_stateid(&stp->st_stateid);
2302 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2303 status = nfs_ok;
2304out:
Neil Brownf2327d92005-09-13 01:25:37 -07002305 if (od->od_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 nfs4_get_stateowner(od->od_stateowner);
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002307 cstate->replay_owner = od->od_stateowner;
Neil Brownf2327d92005-09-13 01:25:37 -07002308 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 nfs4_unlock_state();
2310 return status;
2311}
2312
2313/*
2314 * nfs4_unlock_state() called after encode
2315 */
Al Virob37ad282006-10-19 23:28:59 -07002316__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002317nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002318 struct nfsd4_close *close)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319{
Al Virob37ad282006-10-19 23:28:59 -07002320 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 struct nfs4_stateid *stp;
2322
2323 dprintk("NFSD: nfsd4_close on file %.*s\n",
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002324 (int)cstate->current_fh.fh_dentry->d_name.len,
2325 cstate->current_fh.fh_dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326
2327 nfs4_lock_state();
2328 /* check close_lru for replay */
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002329 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2330 close->cl_seqid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 &close->cl_stateid,
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002332 OPEN_STATE | CLOSE_STATE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333 &close->cl_stateowner, &stp, NULL)))
2334 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335 status = nfs_ok;
2336 update_stateid(&stp->st_stateid);
2337 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2338
J. Bruce Fields04ef5952006-01-18 17:43:21 -08002339 /* release_stateid() calls nfsd_close() if needed */
2340 release_stateid(stp, OPEN_STATE);
2341
2342 /* place unused nfs4_stateowners on so_close_lru list to be
2343 * released by the laundromat service after the lease period
2344 * to enable us to handle CLOSE replay
2345 */
2346 if (list_empty(&close->cl_stateowner->so_stateids))
2347 move_to_close_lru(close->cl_stateowner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348out:
Neil Brownf2327d92005-09-13 01:25:37 -07002349 if (close->cl_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350 nfs4_get_stateowner(close->cl_stateowner);
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002351 cstate->replay_owner = close->cl_stateowner;
Neil Brownf2327d92005-09-13 01:25:37 -07002352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 nfs4_unlock_state();
2354 return status;
2355}
2356
Al Virob37ad282006-10-19 23:28:59 -07002357__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002358nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2359 struct nfsd4_delegreturn *dr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360{
Al Virob37ad282006-10-19 23:28:59 -07002361 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002363 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 goto out;
2365
2366 nfs4_lock_state();
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002367 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2368 &dr->dr_stateid, DELEG_RET, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369 nfs4_unlock_state();
2370out:
2371 return status;
2372}
2373
2374
2375/*
2376 * Lock owner state (byte-range locks)
2377 */
2378#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2379#define LOCK_HASH_BITS 8
2380#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2381#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2382
2383#define lockownerid_hashval(id) \
2384 ((id) & LOCK_HASH_MASK)
2385
2386static inline unsigned int
2387lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2388 struct xdr_netobj *ownername)
2389{
2390 return (file_hashval(inode) + cl_id
2391 + opaque_hashval(ownername->data, ownername->len))
2392 & LOCK_HASH_MASK;
2393}
2394
2395static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2396static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2397static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2398
NeilBrownfd39ca92005-06-23 22:04:03 -07002399static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400find_stateid(stateid_t *stid, int flags)
2401{
2402 struct nfs4_stateid *local = NULL;
2403 u32 st_id = stid->si_stateownerid;
2404 u32 f_id = stid->si_fileid;
2405 unsigned int hashval;
2406
2407 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2408 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2409 hashval = stateid_hashval(st_id, f_id);
2410 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2411 if ((local->st_stateid.si_stateownerid == st_id) &&
2412 (local->st_stateid.si_fileid == f_id))
2413 return local;
2414 }
2415 }
2416 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2417 hashval = stateid_hashval(st_id, f_id);
2418 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2419 if ((local->st_stateid.si_stateownerid == st_id) &&
2420 (local->st_stateid.si_fileid == f_id))
2421 return local;
2422 }
Neil Brown849823c2005-09-13 01:25:36 -07002423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002424 return NULL;
2425}
2426
2427static struct nfs4_delegation *
2428find_delegation_stateid(struct inode *ino, stateid_t *stid)
2429{
NeilBrown13cd2182005-06-23 22:03:10 -07002430 struct nfs4_file *fp;
2431 struct nfs4_delegation *dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432
2433 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2434 stid->si_boot, stid->si_stateownerid,
2435 stid->si_fileid, stid->si_generation);
2436
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 fp = find_file(ino);
NeilBrown13cd2182005-06-23 22:03:10 -07002438 if (!fp)
2439 return NULL;
2440 dl = find_delegation_file(fp, stid);
2441 put_nfs4_file(fp);
2442 return dl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443}
2444
2445/*
2446 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2447 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2448 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2449 * locking, this prevents us from being completely protocol-compliant. The
2450 * real solution to this problem is to start using unsigned file offsets in
2451 * the VFS, but this is a very deep change!
2452 */
2453static inline void
2454nfs4_transform_lock_offset(struct file_lock *lock)
2455{
2456 if (lock->fl_start < 0)
2457 lock->fl_start = OFFSET_MAX;
2458 if (lock->fl_end < 0)
2459 lock->fl_end = OFFSET_MAX;
2460}
2461
NeilBrownd5b90262006-04-10 22:55:22 -07002462/* Hack!: For now, we're defining this just so we can use a pointer to it
2463 * as a unique cookie to identify our (NFSv4's) posix locks. */
Adrian Bunke465a772006-04-10 22:55:23 -07002464static struct lock_manager_operations nfsd_posix_mng_ops = {
NeilBrownd5b90262006-04-10 22:55:22 -07002465};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466
2467static inline void
2468nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2469{
NeilBrownd5b90262006-04-10 22:55:22 -07002470 struct nfs4_stateowner *sop;
2471 unsigned int hval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472
NeilBrownd5b90262006-04-10 22:55:22 -07002473 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2474 sop = (struct nfs4_stateowner *) fl->fl_owner;
2475 hval = lockownerid_hashval(sop->so_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476 kref_get(&sop->so_ref);
2477 deny->ld_sop = sop;
2478 deny->ld_clientid = sop->so_client->cl_clientid;
NeilBrownd5b90262006-04-10 22:55:22 -07002479 } else {
2480 deny->ld_sop = NULL;
2481 deny->ld_clientid.cl_boot = 0;
2482 deny->ld_clientid.cl_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483 }
2484 deny->ld_start = fl->fl_start;
2485 deny->ld_length = ~(u64)0;
2486 if (fl->fl_end != ~(u64)0)
2487 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2488 deny->ld_type = NFS4_READ_LT;
2489 if (fl->fl_type != F_RDLCK)
2490 deny->ld_type = NFS4_WRITE_LT;
2491}
2492
2493static struct nfs4_stateowner *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2495 struct xdr_netobj *owner)
2496{
2497 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2498 struct nfs4_stateowner *op;
2499
2500 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
J. Bruce Fields599e0a22007-07-26 17:04:54 -04002501 if (same_owner_str(op, owner, clid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502 return op;
2503 }
2504 return NULL;
2505}
2506
2507/*
2508 * Alloc a lock owner structure.
2509 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2510 * occured.
2511 *
2512 * strhashval = lock_ownerstr_hashval
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513 */
2514
2515static struct nfs4_stateowner *
2516alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2517 struct nfs4_stateowner *sop;
2518 struct nfs4_replay *rp;
2519 unsigned int idhashval;
2520
2521 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2522 return NULL;
2523 idhashval = lockownerid_hashval(current_ownerid);
2524 INIT_LIST_HEAD(&sop->so_idhash);
2525 INIT_LIST_HEAD(&sop->so_strhash);
2526 INIT_LIST_HEAD(&sop->so_perclient);
NeilBrownea1da632005-06-23 22:04:17 -07002527 INIT_LIST_HEAD(&sop->so_stateids);
2528 INIT_LIST_HEAD(&sop->so_perstateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2530 sop->so_time = 0;
2531 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2532 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
NeilBrownea1da632005-06-23 22:04:17 -07002533 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534 sop->so_is_open_owner = 0;
2535 sop->so_id = current_ownerid++;
2536 sop->so_client = clp;
Neil Brownb59e3c02005-09-13 01:25:38 -07002537 /* It is the openowner seqid that will be incremented in encode in the
2538 * case of new lockowners; so increment the lock seqid manually: */
2539 sop->so_seqid = lock->lk_new_lock_seqid + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 sop->so_confirmed = 1;
2541 rp = &sop->so_replay;
Al Virode1ae282006-01-18 17:43:47 -08002542 rp->rp_status = nfserr_serverfault;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543 rp->rp_buflen = 0;
2544 rp->rp_buf = rp->rp_ibuf;
2545 return sop;
2546}
2547
NeilBrownfd39ca92005-06-23 22:04:03 -07002548static struct nfs4_stateid *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2550{
2551 struct nfs4_stateid *stp;
2552 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2553
NeilBrown5ac049a2005-06-23 22:03:03 -07002554 stp = nfs4_alloc_stateid();
2555 if (stp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002556 goto out;
2557 INIT_LIST_HEAD(&stp->st_hash);
2558 INIT_LIST_HEAD(&stp->st_perfile);
NeilBrownea1da632005-06-23 22:04:17 -07002559 INIT_LIST_HEAD(&stp->st_perstateowner);
2560 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
NeilBrown8beefa22005-06-23 22:03:08 -07002562 list_add(&stp->st_perfile, &fp->fi_stateids);
NeilBrownea1da632005-06-23 22:04:17 -07002563 list_add(&stp->st_perstateowner, &sop->so_stateids);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 stp->st_stateowner = sop;
NeilBrown13cd2182005-06-23 22:03:10 -07002565 get_nfs4_file(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566 stp->st_file = fp;
2567 stp->st_stateid.si_boot = boot_time;
2568 stp->st_stateid.si_stateownerid = sop->so_id;
2569 stp->st_stateid.si_fileid = fp->fi_id;
2570 stp->st_stateid.si_generation = 0;
2571 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2572 stp->st_access_bmap = open_stp->st_access_bmap;
2573 stp->st_deny_bmap = open_stp->st_deny_bmap;
NeilBrown4c4cd222005-07-07 17:59:27 -07002574 stp->st_openstp = open_stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575
2576out:
2577 return stp;
2578}
2579
NeilBrownfd39ca92005-06-23 22:04:03 -07002580static int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581check_lock_length(u64 offset, u64 length)
2582{
2583 return ((length == 0) || ((length != ~(u64)0) &&
2584 LOFF_OVERFLOW(offset, length)));
2585}
2586
2587/*
2588 * LOCK operation
2589 */
Al Virob37ad282006-10-19 23:28:59 -07002590__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002591nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002592 struct nfsd4_lock *lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002593{
NeilBrown3e9e3db2005-06-23 22:04:20 -07002594 struct nfs4_stateowner *open_sop = NULL;
Neil Brownb59e3c02005-09-13 01:25:38 -07002595 struct nfs4_stateowner *lock_sop = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596 struct nfs4_stateid *lock_stp;
2597 struct file *filp;
2598 struct file_lock file_lock;
Andy Adamson8dc7c312006-03-20 13:44:26 -05002599 struct file_lock conflock;
Al Virob37ad282006-10-19 23:28:59 -07002600 __be32 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601 unsigned int strhashval;
Marc Eshel150b3932007-01-18 16:15:35 -05002602 unsigned int cmd;
Al Virob8dd7b92006-10-19 23:29:01 -07002603 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604
2605 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2606 (long long) lock->lk_offset,
2607 (long long) lock->lk_length);
2608
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609 if (check_lock_length(lock->lk_offset, lock->lk_length))
2610 return nfserr_inval;
2611
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002612 if ((status = fh_verify(rqstp, &cstate->current_fh,
2613 S_IFREG, MAY_LOCK))) {
Andy Adamsona6f6ef22006-01-18 17:43:17 -08002614 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2615 return status;
2616 }
2617
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618 nfs4_lock_state();
2619
2620 if (lock->lk_is_new) {
NeilBrown893f8772005-07-07 17:59:17 -07002621 /*
2622 * Client indicates that this is a new lockowner.
2623 * Use open owner and open stateid to create lock owner and
2624 * lock stateid.
2625 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 struct nfs4_stateid *open_stp = NULL;
2627 struct nfs4_file *fp;
2628
2629 status = nfserr_stale_clientid;
Neil Brown849823c2005-09-13 01:25:36 -07002630 if (STALE_CLIENTID(&lock->lk_new_clientid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632
Linus Torvalds1da177e2005-04-16 15:20:36 -07002633 /* validate and update open stateid and open seqid */
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002634 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635 lock->lk_new_open_seqid,
2636 &lock->lk_new_open_stateid,
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002637 OPEN_STATE,
J. Bruce Fields3a655882006-01-18 17:43:19 -08002638 &lock->lk_replay_owner, &open_stp,
Neil Brownb59e3c02005-09-13 01:25:38 -07002639 lock);
NeilBrown37515172005-07-07 17:59:16 -07002640 if (status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 goto out;
J. Bruce Fields3a655882006-01-18 17:43:19 -08002642 open_sop = lock->lk_replay_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 /* create lockowner and lock stateid */
2644 fp = open_stp->st_file;
2645 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2646 open_sop->so_client->cl_clientid.cl_id,
2647 &lock->v.new.owner);
NeilBrown3e9e3db2005-06-23 22:04:20 -07002648 /* XXX: Do we need to check for duplicate stateowners on
2649 * the same file, or should they just be allowed (and
2650 * create new stateids)? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 status = nfserr_resource;
Neil Brownb59e3c02005-09-13 01:25:38 -07002652 lock_sop = alloc_init_lock_stateowner(strhashval,
2653 open_sop->so_client, open_stp, lock);
2654 if (lock_sop == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655 goto out;
Neil Brownb59e3c02005-09-13 01:25:38 -07002656 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
J. Bruce Fields8a280512006-01-18 17:43:18 -08002657 if (lock_stp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659 } else {
2660 /* lock (lock owner + lock stateid) already exists */
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002661 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 lock->lk_old_lock_seqid,
2663 &lock->lk_old_lock_stateid,
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002664 LOCK_STATE,
J. Bruce Fields3a655882006-01-18 17:43:19 -08002665 &lock->lk_replay_owner, &lock_stp, lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 if (status)
2667 goto out;
J. Bruce Fields3a655882006-01-18 17:43:19 -08002668 lock_sop = lock->lk_replay_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002669 }
J. Bruce Fields3a655882006-01-18 17:43:19 -08002670 /* lock->lk_replay_owner and lock_stp have been created or found */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 filp = lock_stp->st_vfs_file;
2672
NeilBrown0dd395d2005-07-07 17:59:15 -07002673 status = nfserr_grace;
2674 if (nfs4_in_grace() && !lock->lk_reclaim)
2675 goto out;
2676 status = nfserr_no_grace;
2677 if (!nfs4_in_grace() && lock->lk_reclaim)
2678 goto out;
2679
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680 locks_init_lock(&file_lock);
2681 switch (lock->lk_type) {
2682 case NFS4_READ_LT:
2683 case NFS4_READW_LT:
2684 file_lock.fl_type = F_RDLCK;
Marc Eshel150b3932007-01-18 16:15:35 -05002685 cmd = F_SETLK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686 break;
2687 case NFS4_WRITE_LT:
2688 case NFS4_WRITEW_LT:
2689 file_lock.fl_type = F_WRLCK;
Marc Eshel150b3932007-01-18 16:15:35 -05002690 cmd = F_SETLK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691 break;
2692 default:
2693 status = nfserr_inval;
2694 goto out;
2695 }
Neil Brownb59e3c02005-09-13 01:25:38 -07002696 file_lock.fl_owner = (fl_owner_t)lock_sop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 file_lock.fl_pid = current->tgid;
2698 file_lock.fl_file = filp;
2699 file_lock.fl_flags = FL_POSIX;
NeilBrownd5b90262006-04-10 22:55:22 -07002700 file_lock.fl_lmops = &nfsd_posix_mng_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
2702 file_lock.fl_start = lock->lk_offset;
2703 if ((lock->lk_length == ~(u64)0) ||
2704 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2705 file_lock.fl_end = ~(u64)0;
2706 else
2707 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2708 nfs4_transform_lock_offset(&file_lock);
2709
2710 /*
2711 * Try to lock the file in the VFS.
2712 * Note: locks.c uses the BKL to protect the inode's lock list.
2713 */
2714
Marc Eshelfd85b812006-11-28 16:26:41 -05002715 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
Al Virob8dd7b92006-10-19 23:29:01 -07002716 switch (-err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717 case 0: /* success! */
2718 update_stateid(&lock_stp->st_stateid);
2719 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2720 sizeof(stateid_t));
Al Virob8dd7b92006-10-19 23:29:01 -07002721 status = 0;
Andy Adamsoneb76b3f2006-03-26 01:37:26 -08002722 break;
2723 case (EAGAIN): /* conflock holds conflicting lock */
2724 status = nfserr_denied;
2725 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2726 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2727 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728 case (EDEADLK):
2729 status = nfserr_deadlock;
Andy Adamsoneb76b3f2006-03-26 01:37:26 -08002730 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002731 default:
Marc Eshelfd85b812006-11-28 16:26:41 -05002732 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
Andy Adamsoneb76b3f2006-03-26 01:37:26 -08002733 status = nfserr_resource;
2734 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736out:
J. Bruce Fields8a280512006-01-18 17:43:18 -08002737 if (status && lock->lk_is_new && lock_sop)
2738 release_stateowner(lock_sop);
J. Bruce Fields3a655882006-01-18 17:43:19 -08002739 if (lock->lk_replay_owner) {
2740 nfs4_get_stateowner(lock->lk_replay_owner);
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002741 cstate->replay_owner = lock->lk_replay_owner;
Neil Brownf2327d92005-09-13 01:25:37 -07002742 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743 nfs4_unlock_state();
2744 return status;
2745}
2746
2747/*
2748 * LOCKT operation
2749 */
Al Virob37ad282006-10-19 23:28:59 -07002750__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002751nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2752 struct nfsd4_lockt *lockt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753{
2754 struct inode *inode;
2755 struct file file;
2756 struct file_lock file_lock;
Marc Eshelfd85b812006-11-28 16:26:41 -05002757 int error;
Al Virob37ad282006-10-19 23:28:59 -07002758 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002759
2760 if (nfs4_in_grace())
2761 return nfserr_grace;
2762
2763 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2764 return nfserr_inval;
2765
2766 lockt->lt_stateowner = NULL;
2767 nfs4_lock_state();
2768
2769 status = nfserr_stale_clientid;
Neil Brown849823c2005-09-13 01:25:36 -07002770 if (STALE_CLIENTID(&lockt->lt_clientid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002771 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002772
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002773 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
Neil Brown849823c2005-09-13 01:25:36 -07002774 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002775 if (status == nfserr_symlink)
2776 status = nfserr_inval;
2777 goto out;
2778 }
2779
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002780 inode = cstate->current_fh.fh_dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002781 locks_init_lock(&file_lock);
2782 switch (lockt->lt_type) {
2783 case NFS4_READ_LT:
2784 case NFS4_READW_LT:
2785 file_lock.fl_type = F_RDLCK;
2786 break;
2787 case NFS4_WRITE_LT:
2788 case NFS4_WRITEW_LT:
2789 file_lock.fl_type = F_WRLCK;
2790 break;
2791 default:
J. Bruce Fields2fdada02007-07-27 16:10:37 -04002792 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 status = nfserr_inval;
2794 goto out;
2795 }
2796
2797 lockt->lt_stateowner = find_lockstateowner_str(inode,
2798 &lockt->lt_clientid, &lockt->lt_owner);
2799 if (lockt->lt_stateowner)
2800 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2801 file_lock.fl_pid = current->tgid;
2802 file_lock.fl_flags = FL_POSIX;
NeilBrownd5b90262006-04-10 22:55:22 -07002803 file_lock.fl_lmops = &nfsd_posix_mng_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002804
2805 file_lock.fl_start = lockt->lt_offset;
2806 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2807 file_lock.fl_end = ~(u64)0;
2808 else
2809 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2810
2811 nfs4_transform_lock_offset(&file_lock);
2812
Marc Eshelfd85b812006-11-28 16:26:41 -05002813 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002814 * since LOCKT doesn't require an OPEN, and therefore a struct
Marc Eshelfd85b812006-11-28 16:26:41 -05002815 * file may not exist, pass vfs_test_lock a struct file with
Linus Torvalds1da177e2005-04-16 15:20:36 -07002816 * only the dentry:inode set.
2817 */
2818 memset(&file, 0, sizeof (struct file));
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002819 file.f_path.dentry = cstate->current_fh.fh_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002820
2821 status = nfs_ok;
Marc Eshelfd85b812006-11-28 16:26:41 -05002822 error = vfs_test_lock(&file, &file_lock);
2823 if (error) {
2824 status = nfserrno(error);
2825 goto out;
2826 }
Marc Eshel9d6a8c52007-02-21 00:55:18 -05002827 if (file_lock.fl_type != F_UNLCK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002828 status = nfserr_denied;
Marc Eshel9d6a8c52007-02-21 00:55:18 -05002829 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002830 }
2831out:
2832 nfs4_unlock_state();
2833 return status;
2834}
2835
Al Virob37ad282006-10-19 23:28:59 -07002836__be32
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002837nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002838 struct nfsd4_locku *locku)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839{
2840 struct nfs4_stateid *stp;
2841 struct file *filp = NULL;
2842 struct file_lock file_lock;
Al Virob37ad282006-10-19 23:28:59 -07002843 __be32 status;
Al Virob8dd7b92006-10-19 23:29:01 -07002844 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002845
2846 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2847 (long long) locku->lu_offset,
2848 (long long) locku->lu_length);
2849
2850 if (check_lock_length(locku->lu_offset, locku->lu_length))
2851 return nfserr_inval;
2852
2853 nfs4_lock_state();
2854
J.Bruce Fieldsca364312006-12-13 00:35:27 -08002855 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856 locku->lu_seqid,
2857 &locku->lu_stateid,
J. Bruce Fieldsf3362732008-01-26 14:58:45 -05002858 LOCK_STATE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002859 &locku->lu_stateowner, &stp, NULL)))
2860 goto out;
2861
2862 filp = stp->st_vfs_file;
2863 BUG_ON(!filp);
2864 locks_init_lock(&file_lock);
2865 file_lock.fl_type = F_UNLCK;
2866 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2867 file_lock.fl_pid = current->tgid;
2868 file_lock.fl_file = filp;
2869 file_lock.fl_flags = FL_POSIX;
NeilBrownd5b90262006-04-10 22:55:22 -07002870 file_lock.fl_lmops = &nfsd_posix_mng_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 file_lock.fl_start = locku->lu_offset;
2872
2873 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2874 file_lock.fl_end = ~(u64)0;
2875 else
2876 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2877 nfs4_transform_lock_offset(&file_lock);
2878
2879 /*
2880 * Try to unlock the file in the VFS.
2881 */
Marc Eshelfd85b812006-11-28 16:26:41 -05002882 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
Al Virob8dd7b92006-10-19 23:29:01 -07002883 if (err) {
Marc Eshelfd85b812006-11-28 16:26:41 -05002884 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885 goto out_nfserr;
2886 }
2887 /*
2888 * OK, unlock succeeded; the only thing left to do is update the stateid.
2889 */
2890 update_stateid(&stp->st_stateid);
2891 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2892
2893out:
Neil Brownf2327d92005-09-13 01:25:37 -07002894 if (locku->lu_stateowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895 nfs4_get_stateowner(locku->lu_stateowner);
J.Bruce Fieldsa4f1706a92006-12-13 00:35:28 -08002896 cstate->replay_owner = locku->lu_stateowner;
Neil Brownf2327d92005-09-13 01:25:37 -07002897 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898 nfs4_unlock_state();
2899 return status;
2900
2901out_nfserr:
Al Virob8dd7b92006-10-19 23:29:01 -07002902 status = nfserrno(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903 goto out;
2904}
2905
2906/*
2907 * returns
2908 * 1: locks held by lockowner
2909 * 0: no locks held by lockowner
2910 */
2911static int
2912check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2913{
2914 struct file_lock **flpp;
Josef "Jeff" Sipek7eaa36e2006-12-08 02:36:41 -08002915 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916 int status = 0;
2917
2918 lock_kernel();
2919 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
J. Bruce Fields796dadf2006-01-18 17:43:22 -08002920 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 status = 1;
2922 goto out;
J. Bruce Fields796dadf2006-01-18 17:43:22 -08002923 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924 }
2925out:
2926 unlock_kernel();
2927 return status;
2928}
2929
Al Virob37ad282006-10-19 23:28:59 -07002930__be32
J.Bruce Fieldsb5914802006-12-13 00:35:38 -08002931nfsd4_release_lockowner(struct svc_rqst *rqstp,
2932 struct nfsd4_compound_state *cstate,
2933 struct nfsd4_release_lockowner *rlockowner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934{
2935 clientid_t *clid = &rlockowner->rl_clientid;
NeilBrown3e9e3db2005-06-23 22:04:20 -07002936 struct nfs4_stateowner *sop;
2937 struct nfs4_stateid *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002938 struct xdr_netobj *owner = &rlockowner->rl_owner;
NeilBrown3e9e3db2005-06-23 22:04:20 -07002939 struct list_head matches;
2940 int i;
Al Virob37ad282006-10-19 23:28:59 -07002941 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942
2943 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2944 clid->cl_boot, clid->cl_id);
2945
2946 /* XXX check for lease expiration */
2947
2948 status = nfserr_stale_clientid;
Neil Brown849823c2005-09-13 01:25:36 -07002949 if (STALE_CLIENTID(clid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002950 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951
2952 nfs4_lock_state();
2953
NeilBrown3e9e3db2005-06-23 22:04:20 -07002954 status = nfserr_locks_held;
2955 /* XXX: we're doing a linear search through all the lockowners.
2956 * Yipes! For now we'll just hope clients aren't really using
2957 * release_lockowner much, but eventually we have to fix these
2958 * data structures. */
2959 INIT_LIST_HEAD(&matches);
2960 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2961 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
J. Bruce Fields599e0a22007-07-26 17:04:54 -04002962 if (!same_owner_str(sop, owner, clid))
NeilBrown3e9e3db2005-06-23 22:04:20 -07002963 continue;
2964 list_for_each_entry(stp, &sop->so_stateids,
2965 st_perstateowner) {
2966 if (check_for_locks(stp->st_vfs_file, sop))
2967 goto out;
2968 /* Note: so_perclient unused for lockowners,
2969 * so it's OK to fool with here. */
2970 list_add(&sop->so_perclient, &matches);
2971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 }
NeilBrown3e9e3db2005-06-23 22:04:20 -07002973 }
2974 /* Clients probably won't expect us to return with some (but not all)
2975 * of the lockowner state released; so don't release any until all
2976 * have been checked. */
2977 status = nfs_ok;
NeilBrown0fa822e2005-07-07 17:59:14 -07002978 while (!list_empty(&matches)) {
2979 sop = list_entry(matches.next, struct nfs4_stateowner,
2980 so_perclient);
2981 /* unhash_stateowner deletes so_perclient only
2982 * for openowners. */
2983 list_del(&sop->so_perclient);
NeilBrown3e9e3db2005-06-23 22:04:20 -07002984 release_stateowner(sop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985 }
2986out:
2987 nfs4_unlock_state();
2988 return status;
2989}
2990
2991static inline struct nfs4_client_reclaim *
NeilBrowna55370a2005-06-23 22:03:52 -07002992alloc_reclaim(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993{
NeilBrowna55370a2005-06-23 22:03:52 -07002994 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002995}
2996
NeilBrownc7b9a452005-06-23 22:04:30 -07002997int
2998nfs4_has_reclaimed_state(const char *name)
2999{
3000 unsigned int strhashval = clientstr_hashval(name);
3001 struct nfs4_client *clp;
3002
3003 clp = find_confirmed_client_by_str(name, strhashval);
3004 return clp ? 1 : 0;
3005}
3006
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007/*
3008 * failure => all reset bets are off, nfserr_no_grace...
3009 */
NeilBrown190e4fb2005-06-23 22:04:25 -07003010int
3011nfs4_client_to_reclaim(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012{
3013 unsigned int strhashval;
3014 struct nfs4_client_reclaim *crp = NULL;
3015
NeilBrowna55370a2005-06-23 22:03:52 -07003016 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3017 crp = alloc_reclaim();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 if (!crp)
3019 return 0;
NeilBrowna55370a2005-06-23 22:03:52 -07003020 strhashval = clientstr_hashval(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021 INIT_LIST_HEAD(&crp->cr_strhash);
3022 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
NeilBrowna55370a2005-06-23 22:03:52 -07003023 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024 reclaim_str_hashtbl_size++;
3025 return 1;
3026}
3027
3028static void
3029nfs4_release_reclaim(void)
3030{
3031 struct nfs4_client_reclaim *crp = NULL;
3032 int i;
3033
Linus Torvalds1da177e2005-04-16 15:20:36 -07003034 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3035 while (!list_empty(&reclaim_str_hashtbl[i])) {
3036 crp = list_entry(reclaim_str_hashtbl[i].next,
3037 struct nfs4_client_reclaim, cr_strhash);
3038 list_del(&crp->cr_strhash);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003039 kfree(crp);
3040 reclaim_str_hashtbl_size--;
3041 }
3042 }
3043 BUG_ON(reclaim_str_hashtbl_size);
3044}
3045
3046/*
3047 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
NeilBrownfd39ca92005-06-23 22:04:03 -07003048static struct nfs4_client_reclaim *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049nfs4_find_reclaim_client(clientid_t *clid)
3050{
3051 unsigned int strhashval;
3052 struct nfs4_client *clp;
3053 struct nfs4_client_reclaim *crp = NULL;
3054
3055
3056 /* find clientid in conf_id_hashtbl */
3057 clp = find_confirmed_client(clid);
3058 if (clp == NULL)
3059 return NULL;
3060
NeilBrowna55370a2005-06-23 22:03:52 -07003061 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3062 clp->cl_name.len, clp->cl_name.data,
3063 clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003064
3065 /* find clp->cl_name in reclaim_str_hashtbl */
NeilBrowna55370a2005-06-23 22:03:52 -07003066 strhashval = clientstr_hashval(clp->cl_recdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
NeilBrowna55370a2005-06-23 22:03:52 -07003068 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003069 return crp;
3070 }
3071 }
3072 return NULL;
3073}
3074
3075/*
3076* Called from OPEN. Look for clientid in reclaim list.
3077*/
Al Virob37ad282006-10-19 23:28:59 -07003078__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079nfs4_check_open_reclaim(clientid_t *clid)
3080{
NeilBrowndfc83562005-06-23 22:03:16 -07003081 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082}
3083
NeilBrownac4d8ff22005-06-23 22:03:30 -07003084/* initialization to perform at module load time: */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003086int
NeilBrownac4d8ff22005-06-23 22:03:30 -07003087nfs4_state_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088{
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003089 int i, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003091 status = nfsd4_init_slabs();
3092 if (status)
3093 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3095 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3096 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3097 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3098 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3099 }
3100 for (i = 0; i < FILE_HASH_SIZE; i++) {
3101 INIT_LIST_HEAD(&file_hashtbl[i]);
3102 }
3103 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3104 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3105 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3106 }
3107 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3108 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3109 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3110 }
3111 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3112 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3113 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3114 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003115 memset(&onestateid, ~0, sizeof(stateid_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003116 INIT_LIST_HEAD(&close_lru);
3117 INIT_LIST_HEAD(&client_lru);
3118 INIT_LIST_HEAD(&del_recall_lru);
NeilBrownac4d8ff22005-06-23 22:03:30 -07003119 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3120 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3121 reclaim_str_hashtbl_size = 0;
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003122 return 0;
NeilBrownac4d8ff22005-06-23 22:03:30 -07003123}
3124
NeilBrown190e4fb2005-06-23 22:04:25 -07003125static void
3126nfsd4_load_reboot_recovery_data(void)
3127{
3128 int status;
3129
NeilBrown0964a3d2005-06-23 22:04:32 -07003130 nfs4_lock_state();
3131 nfsd4_init_recdir(user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -07003132 status = nfsd4_recdir_load();
NeilBrown0964a3d2005-06-23 22:04:32 -07003133 nfs4_unlock_state();
NeilBrown190e4fb2005-06-23 22:04:25 -07003134 if (status)
3135 printk("NFSD: Failure reading reboot recovery data\n");
3136}
3137
Marc Eshel9a8db972007-07-17 04:04:35 -07003138unsigned long
3139get_nfs4_grace_period(void)
3140{
3141 return max(user_lease_time, lease_time) * HZ;
3142}
3143
Meelap Shahc2f1a552007-07-17 04:04:39 -07003144/*
3145 * Since the lifetime of a delegation isn't limited to that of an open, a
3146 * client may quite reasonably hang on to a delegation as long as it has
3147 * the inode cached. This becomes an obvious problem the first time a
3148 * client's inode cache approaches the size of the server's total memory.
3149 *
3150 * For now we avoid this problem by imposing a hard limit on the number
3151 * of delegations, which varies according to the server's memory size.
3152 */
3153static void
3154set_max_delegations(void)
3155{
3156 /*
3157 * Allow at most 4 delegations per megabyte of RAM. Quick
3158 * estimates suggest that in the worst case (where every delegation
3159 * is for a different inode), a delegation could take about 1.5K,
3160 * giving a worst case usage of about 6% of memory.
3161 */
3162 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3163}
3164
NeilBrownac4d8ff22005-06-23 22:03:30 -07003165/* initialization to perform when the nfsd service is started: */
3166
3167static void
3168__nfs4_state_start(void)
3169{
Marc Eshel9a8db972007-07-17 04:04:35 -07003170 unsigned long grace_time;
NeilBrownac4d8ff22005-06-23 22:03:30 -07003171
Linus Torvalds1da177e2005-04-16 15:20:36 -07003172 boot_time = get_seconds();
Marc Eshel9a8db972007-07-17 04:04:35 -07003173 grace_time = get_nfs_grace_period();
NeilBrownd99a05a2005-06-23 22:03:21 -07003174 lease_time = user_lease_time;
NeilBrowna76b4312005-06-23 22:04:01 -07003175 in_grace = 1;
Marc Eshel9a8db972007-07-17 04:04:35 -07003176 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3177 grace_time/HZ);
NeilBrown58da2822005-06-23 22:03:19 -07003178 laundry_wq = create_singlethread_workqueue("nfsd4");
Marc Eshel9a8db972007-07-17 04:04:35 -07003179 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
Meelap Shahc2f1a552007-07-17 04:04:39 -07003180 set_max_delegations();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003181}
3182
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003183void
NeilBrown76a35502005-06-23 22:03:26 -07003184nfs4_state_start(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003185{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003186 if (nfs4_init)
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003187 return;
NeilBrown190e4fb2005-06-23 22:04:25 -07003188 nfsd4_load_reboot_recovery_data();
NeilBrown76a35502005-06-23 22:03:26 -07003189 __nfs4_state_start();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003190 nfs4_init = 1;
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -04003191 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003192}
3193
3194int
3195nfs4_in_grace(void)
3196{
NeilBrowna76b4312005-06-23 22:04:01 -07003197 return in_grace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003198}
3199
3200time_t
3201nfs4_lease_time(void)
3202{
3203 return lease_time;
3204}
3205
3206static void
3207__nfs4_state_shutdown(void)
3208{
3209 int i;
3210 struct nfs4_client *clp = NULL;
3211 struct nfs4_delegation *dp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212 struct list_head *pos, *next, reaplist;
3213
Linus Torvalds1da177e2005-04-16 15:20:36 -07003214 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3215 while (!list_empty(&conf_id_hashtbl[i])) {
3216 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3217 expire_client(clp);
3218 }
3219 while (!list_empty(&unconf_str_hashtbl[i])) {
3220 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3221 expire_client(clp);
3222 }
3223 }
3224 INIT_LIST_HEAD(&reaplist);
3225 spin_lock(&recall_lock);
3226 list_for_each_safe(pos, next, &del_recall_lru) {
3227 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3228 list_move(&dp->dl_recall_lru, &reaplist);
3229 }
3230 spin_unlock(&recall_lock);
3231 list_for_each_safe(pos, next, &reaplist) {
3232 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3233 list_del_init(&dp->dl_recall_lru);
3234 unhash_delegation(dp);
3235 }
3236
NeilBrown190e4fb2005-06-23 22:04:25 -07003237 nfsd4_shutdown_recdir();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003238 nfs4_init = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003239}
3240
3241void
3242nfs4_state_shutdown(void)
3243{
NeilBrown5e8d5c22006-04-10 22:55:37 -07003244 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3245 destroy_workqueue(laundry_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003246 nfs4_lock_state();
3247 nfs4_release_reclaim();
3248 __nfs4_state_shutdown();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 nfs4_unlock_state();
3250}
3251
NeilBrown0964a3d2005-06-23 22:04:32 -07003252static void
3253nfs4_set_recdir(char *recdir)
3254{
3255 nfs4_lock_state();
3256 strcpy(user_recovery_dirname, recdir);
3257 nfs4_unlock_state();
3258}
3259
3260/*
3261 * Change the NFSv4 recovery directory to recdir.
3262 */
3263int
3264nfs4_reset_recoverydir(char *recdir)
3265{
3266 int status;
3267 struct nameidata nd;
3268
3269 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3270 if (status)
3271 return status;
3272 status = -ENOTDIR;
Jan Blunck4ac91372008-02-14 19:34:32 -08003273 if (S_ISDIR(nd.path.dentry->d_inode->i_mode)) {
NeilBrown0964a3d2005-06-23 22:04:32 -07003274 nfs4_set_recdir(recdir);
3275 status = 0;
3276 }
Jan Blunck1d957f92008-02-14 19:34:35 -08003277 path_put(&nd.path);
NeilBrown0964a3d2005-06-23 22:04:32 -07003278 return status;
3279}
3280
Linus Torvalds1da177e2005-04-16 15:20:36 -07003281/*
3282 * Called when leasetime is changed.
3283 *
NeilBrownd99a05a2005-06-23 22:03:21 -07003284 * The only way the protocol gives us to handle on-the-fly lease changes is to
3285 * simulate a reboot. Instead of doing that, we just wait till the next time
3286 * we start to register any changes in lease time. If the administrator
3287 * really wants to change the lease time *now*, they can go ahead and bring
3288 * nfsd down and then back up again after changing the lease time.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003289 */
3290void
3291nfs4_reset_lease(time_t leasetime)
3292{
NeilBrownd99a05a2005-06-23 22:03:21 -07003293 lock_kernel();
3294 user_lease_time = leasetime;
3295 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003296}