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LockD: make lockd manager allocated per network namespace
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4 1/*
1da177e4
LT		 2* Copyright (c) 2001 The Regents of the University of Michigan.
3* All rights reserved.
4*
5* Kendrick Smith <kmsmith@umich.edu>
6* Andy Adamson <kandros@umich.edu>
7*
8* Redistribution and use in source and binary forms, with or without
9* modification, are permitted provided that the following conditions
10* are met:
11*
12* 1. Redistributions of source code must retain the above copyright
13* notice, this list of conditions and the following disclaimer.
14* 2. Redistributions in binary form must reproduce the above copyright
15* notice, this list of conditions and the following disclaimer in the
16* documentation and/or other materials provided with the distribution.
17* 3. Neither the name of the University nor the names of its
18* contributors may be used to endorse or promote products derived
19* from this software without specific prior written permission.
20*
21* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32*
33*/
34
aceaf78d 35#include <linux/file.h>
b89f4321 36#include <linux/fs.h>
5a0e3ad6 37#include <linux/slab.h>
0964a3d3 38#include <linux/namei.h>
c2f1a551 39#include <linux/swap.h>
17456804 40#include <linux/pagemap.h>
7df302f7 41#include <linux/ratelimit.h>
68e76ad0 42#include <linux/sunrpc/svcauth_gss.h>
363168b4 43#include <linux/sunrpc/clnt.h>
9a74af21 44#include "xdr4.h"
0a3adade 45#include "vfs.h"
bfa4b365 46#include "current_stateid.h"
99dbb8fe 47#include "fault_inject.h"
1da177e4
LT		 48
49#define NFSDDBG_FACILITY NFSDDBG_PROC
50
51/* Globals */
cf07d2ea 52time_t nfsd4_lease = 90; /* default lease time */
efc4bb4f 53time_t nfsd4_grace = 90;
fd39ca9a 54static time_t boot_time;
f32f3c2d
BF		 55
56#define all_ones {{~0,~0},~0}
57static const stateid_t one_stateid = {
58 .si_generation = ~0,
59 .si_opaque = all_ones,
60};
61static const stateid_t zero_stateid = {
62 /* all fields zero */
63};
19ff0f28
TM		 64static const stateid_t currentstateid = {
65 .si_generation = 1,
66};
f32f3c2d 67
ec6b5d7b 68static u64 current_sessionid = 1;
fd39ca9a 69
f32f3c2d
BF		 70#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
71#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
19ff0f28 72#define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
1da177e4 73
1da177e4 74/* forward declarations */
fe0750e5 75static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
1da177e4 76
8b671b80
BF		 77/* Locking: */
78
79/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 80static DEFINE_MUTEX(client_mutex);
1da177e4 81
8b671b80
BF		 82/*
83 * Currently used for the del_recall_lru and file hash table. In an
84 * effort to decrease the scope of the client_mutex, this spinlock may
85 * eventually cover more:
86 */
87static DEFINE_SPINLOCK(recall_lock);
88
fe0750e5
BF		 89static struct kmem_cache *openowner_slab = NULL;
90static struct kmem_cache *lockowner_slab = NULL;
e18b890b
CL		 91static struct kmem_cache *file_slab = NULL;
92static struct kmem_cache *stateid_slab = NULL;
93static struct kmem_cache *deleg_slab = NULL;
e60d4398 94
1da177e4
LT		 95void
96nfs4_lock_state(void)
97{
353ab6e9 98 mutex_lock(&client_mutex);
1da177e4
LT		 99}
100
508dc6e1
BH		 101static void free_session(struct kref *);
102
103/* Must be called under the client_lock */
104static void nfsd4_put_session_locked(struct nfsd4_session *ses)
105{
106 kref_put(&ses->se_ref, free_session);
107}
108
109static void nfsd4_get_session(struct nfsd4_session *ses)
110{
111 kref_get(&ses->se_ref);
112}
113
1da177e4
LT		 114void
115nfs4_unlock_state(void)
116{
353ab6e9 117 mutex_unlock(&client_mutex);
1da177e4
LT		 118}
119
120static inline u32
121opaque_hashval(const void *ptr, int nbytes)
122{
123 unsigned char *cptr = (unsigned char *) ptr;
124
125 u32 x = 0;
126 while (nbytes--) {
127 x *= 37;
128 x += *cptr++;
129 }
130 return x;
131}
132
1da177e4
LT		 133static struct list_head del_recall_lru;
134
32513b40
BF		 135static void nfsd4_free_file(struct nfs4_file *f)
136{
137 kmem_cache_free(file_slab, f);
138}
139
13cd2184
N		 140static inline void
141put_nfs4_file(struct nfs4_file *fi)
142{
8b671b80
BF		 143 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
144 list_del(&fi->fi_hash);
145 spin_unlock(&recall_lock);
146 iput(fi->fi_inode);
32513b40 147 nfsd4_free_file(fi);
8b671b80 148 }
13cd2184
N		 149}
150
151static inline void
152get_nfs4_file(struct nfs4_file *fi)
153{
8b671b80 154 atomic_inc(&fi->fi_ref);
13cd2184
N		 155}
156
ef0f3390 157static int num_delegations;
c2f1a551 158unsigned int max_delegations;
ef0f3390
N		 159
160/*
161 * Open owner state (share locks)
162 */
163
16bfdaaf
BF		 164/* hash tables for lock and open owners */
165#define OWNER_HASH_BITS 8
166#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
167#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
ef0f3390 168
16bfdaaf 169static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
ddc04c41
BF		 170{
171 unsigned int ret;
172
173 ret = opaque_hashval(ownername->data, ownername->len);
174 ret += clientid;
16bfdaaf 175 return ret & OWNER_HASH_MASK;
ddc04c41 176}
ef0f3390 177
16bfdaaf 178static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
ef0f3390
N		 179
180/* hash table for nfs4_file */
181#define FILE_HASH_BITS 8
182#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
35079582 183
ddc04c41
BF		 184static unsigned int file_hashval(struct inode *ino)
185{
186 /* XXX: why are we hashing on inode pointer, anyway? */
187 return hash_ptr(ino, FILE_HASH_BITS);
188}
189
ef0f3390 190static struct list_head file_hashtbl[FILE_HASH_SIZE];
ef0f3390 191
998db52c 192static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
f9d7562f
BF		 193{
194 BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
195 atomic_inc(&fp->fi_access[oflag]);
196}
197
998db52c
BF		 198static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
199{
200 if (oflag == O_RDWR) {
201 __nfs4_file_get_access(fp, O_RDONLY);
202 __nfs4_file_get_access(fp, O_WRONLY);
203 } else
204 __nfs4_file_get_access(fp, oflag);
205}
206
207static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
f9d7562f
BF		 208{
209 if (fp->fi_fds[oflag]) {
210 fput(fp->fi_fds[oflag]);
211 fp->fi_fds[oflag] = NULL;
212 }
213}
214
998db52c 215static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
f9d7562f
BF		 216{
217 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
f9d7562f 218 nfs4_file_put_fd(fp, oflag);
3d02fa29
BF		 219 /*
220 * It's also safe to get rid of the RDWR open *if*
221 * we no longer have need of the other kind of access
222 * or if we already have the other kind of open:
223 */
224 if (fp->fi_fds[1-oflag]
225 || atomic_read(&fp->fi_access[1 - oflag]) == 0)
226 nfs4_file_put_fd(fp, O_RDWR);
f9d7562f
BF		 227 }
228}
229
998db52c
BF		 230static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
231{
232 if (oflag == O_RDWR) {
233 __nfs4_file_put_access(fp, O_RDONLY);
234 __nfs4_file_put_access(fp, O_WRONLY);
235 } else
236 __nfs4_file_put_access(fp, oflag);
237}
238
6136d2b4 239static inline int get_new_stid(struct nfs4_stid *stid)
36d44c60 240{
6136d2b4 241 static int min_stateid = 0;
38c2f4b1 242 struct idr *stateids = &stid->sc_client->cl_stateids;
6136d2b4
BF		 243 int new_stid;
244 int error;
245
38c2f4b1 246 error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
6136d2b4 247 /*
996e0938
BF		 248 * Note: the necessary preallocation was done in
249 * nfs4_alloc_stateid(). The idr code caps the number of
250 * preallocations that can exist at a time, but the state lock
251 * prevents anyone from using ours before we get here:
6136d2b4
BF		 252 */
253 BUG_ON(error);
254 /*
255 * It shouldn't be a problem to reuse an opaque stateid value.
256 * I don't think it is for 4.1. But with 4.0 I worry that, for
257 * example, a stray write retransmission could be accepted by
258 * the server when it should have been rejected. Therefore,
259 * adopt a trick from the sctp code to attempt to maximize the
260 * amount of time until an id is reused, by ensuring they always
261 * "increase" (mod INT_MAX):
262 */
36d44c60 263
6136d2b4
BF		 264 min_stateid = new_stid+1;
265 if (min_stateid == INT_MAX)
266 min_stateid = 0;
267 return new_stid;
36d44c60
BF		 268}
269
996e0938 270static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
2a74aba7
BF		 271{
272 stateid_t *s = &stid->sc_stateid;
6136d2b4 273 int new_id;
2a74aba7
BF		 274
275 stid->sc_type = type;
276 stid->sc_client = cl;
277 s->si_opaque.so_clid = cl->cl_clientid;
6136d2b4 278 new_id = get_new_stid(stid);
6136d2b4 279 s->si_opaque.so_id = (u32)new_id;
2a74aba7
BF		 280 /* Will be incremented before return to client: */
281 s->si_generation = 0;
996e0938
BF		 282}
283
284static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
285{
286 struct idr *stateids = &cl->cl_stateids;
287
288 if (!idr_pre_get(stateids, GFP_KERNEL))
289 return NULL;
290 /*
291 * Note: if we fail here (or any time between now and the time
292 * we actually get the new idr), we won't need to undo the idr
293 * preallocation, since the idr code caps the number of
294 * preallocated entries.
295 */
296 return kmem_cache_alloc(slab, GFP_KERNEL);
2a74aba7
BF		 297}
298
4cdc951b
BF		 299static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
300{
301 return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
302}
303
1da177e4 304static struct nfs4_delegation *
dcef0413 305alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
1da177e4
LT		 306{
307 struct nfs4_delegation *dp;
308 struct nfs4_file *fp = stp->st_file;
1da177e4
LT		 309
310 dprintk("NFSD alloc_init_deleg\n");
c3e48080
BF		 311 /*
312 * Major work on the lease subsystem (for example, to support
313 * calbacks on stat) will be required before we can support
314 * write delegations properly.
315 */
316 if (type != NFS4_OPEN_DELEGATE_READ)
317 return NULL;
47f9940c
MS		 318 if (fp->fi_had_conflict)
319 return NULL;
c2f1a551 320 if (num_delegations > max_delegations)
ef0f3390 321 return NULL;
996e0938 322 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
5b2d21c1 323 if (dp == NULL)
1da177e4 324 return dp;
996e0938 325 init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
2a74aba7
BF		 326 /*
327 * delegation seqid's are never incremented. The 4.1 special
6136d2b4
BF		 328 * meaning of seqid 0 isn't meaningful, really, but let's avoid
329 * 0 anyway just for consistency and use 1:
2a74aba7
BF		 330 */
331 dp->dl_stid.sc_stateid.si_generation = 1;
ef0f3390 332 num_delegations++;
ea1da636
N		 333 INIT_LIST_HEAD(&dp->dl_perfile);
334 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4 335 INIT_LIST_HEAD(&dp->dl_recall_lru);
13cd2184 336 get_nfs4_file(fp);
1da177e4 337 dp->dl_file = fp;
1da177e4 338 dp->dl_type = type;
6c02eaa1 339 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 340 dp->dl_time = 0;
341 atomic_set(&dp->dl_count, 1);
b5a1a81e 342 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
1da177e4
LT		 343 return dp;
344}
345
346void
347nfs4_put_delegation(struct nfs4_delegation *dp)
348{
349 if (atomic_dec_and_test(&dp->dl_count)) {
350 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 351 put_nfs4_file(dp->dl_file);
5b2d21c1 352 kmem_cache_free(deleg_slab, dp);
ef0f3390 353 num_delegations--;
1da177e4
LT		 354 }
355}
356
acfdf5c3 357static void nfs4_put_deleg_lease(struct nfs4_file *fp)
1da177e4 358{
acfdf5c3
BF		 359 if (atomic_dec_and_test(&fp->fi_delegees)) {
360 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
361 fp->fi_lease = NULL;
4ee63624 362 fput(fp->fi_deleg_file);
acfdf5c3
BF		 363 fp->fi_deleg_file = NULL;
364 }
1da177e4
LT		 365}
366
6136d2b4
BF		 367static void unhash_stid(struct nfs4_stid *s)
368{
38c2f4b1
BF		 369 struct idr *stateids = &s->sc_client->cl_stateids;
370
371 idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
6136d2b4
BF		 372}
373
1da177e4
LT		 374/* Called under the state lock. */
375static void
376unhash_delegation(struct nfs4_delegation *dp)
377{
6136d2b4 378 unhash_stid(&dp->dl_stid);
ea1da636 379 list_del_init(&dp->dl_perclnt);
1da177e4 380 spin_lock(&recall_lock);
5d926e8c 381 list_del_init(&dp->dl_perfile);
1da177e4
LT		 382 list_del_init(&dp->dl_recall_lru);
383 spin_unlock(&recall_lock);
acfdf5c3 384 nfs4_put_deleg_lease(dp->dl_file);
1da177e4
LT		 385 nfs4_put_delegation(dp);
386}
387
388/*
389 * SETCLIENTID state
390 */
391
36acb66b 392/* client_lock protects the client lru list and session hash table */
9089f1b4
BH		 393static DEFINE_SPINLOCK(client_lock);
394
1da177e4
LT		 395/* Hash tables for nfs4_clientid state */
396#define CLIENT_HASH_BITS 4
397#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
398#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
399
ddc04c41
BF		 400static unsigned int clientid_hashval(u32 id)
401{
402 return id & CLIENT_HASH_MASK;
403}
404
405static unsigned int clientstr_hashval(const char *name)
406{
407 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
408}
409
1da177e4
LT		 410/*
411 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
412 * used in reboot/reset lease grace period processing
413 *
414 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
415 * setclientid_confirmed info.
416 *
417 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
418 * setclientid info.
419 *
420 * client_lru holds client queue ordered by nfs4_client.cl_time
421 * for lease renewal.
422 *
423 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
424 * for last close replay.
425 */
426static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
427static int reclaim_str_hashtbl_size = 0;
428static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
429static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
430static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
431static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
432static struct list_head client_lru;
433static struct list_head close_lru;
434
f9d7562f
BF		 435/*
436 * We store the NONE, READ, WRITE, and BOTH bits separately in the
437 * st_{access,deny}_bmap field of the stateid, in order to track not
438 * only what share bits are currently in force, but also what
439 * combinations of share bits previous opens have used. This allows us
440 * to enforce the recommendation of rfc 3530 14.2.19 that the server
441 * return an error if the client attempt to downgrade to a combination
442 * of share bits not explicable by closing some of its previous opens.
443 *
444 * XXX: This enforcement is actually incomplete, since we don't keep
445 * track of access/deny bit combinations; so, e.g., we allow:
446 *
447 * OPEN allow read, deny write
448 * OPEN allow both, deny none
449 * DOWNGRADE allow read, deny none
450 *
451 * which we should reject.
452 */
5ae037e5
JL		 453static unsigned int
454bmap_to_share_mode(unsigned long bmap) {
f9d7562f 455 int i;
5ae037e5 456 unsigned int access = 0;
f9d7562f 457
f9d7562f
BF		 458 for (i = 1; i < 4; i++) {
459 if (test_bit(i, &bmap))
5ae037e5 460 access |= i;
f9d7562f 461 }
5ae037e5 462 return access;
f9d7562f
BF		 463}
464
3a328614 465static bool
dcef0413 466test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
f9d7562f
BF		 467 unsigned int access, deny;
468
5ae037e5
JL		 469 access = bmap_to_share_mode(stp->st_access_bmap);
470 deny = bmap_to_share_mode(stp->st_deny_bmap);
f9d7562f 471 if ((access & open->op_share_deny) || (deny & open->op_share_access))
3a328614
JL		 472 return false;
473 return true;
f9d7562f
BF		 474}
475
82c5ff1b
JL		 476/* set share access for a given stateid */
477static inline void
478set_access(u32 access, struct nfs4_ol_stateid *stp)
479{
480 __set_bit(access, &stp->st_access_bmap);
481}
482
483/* clear share access for a given stateid */
484static inline void
485clear_access(u32 access, struct nfs4_ol_stateid *stp)
486{
487 __clear_bit(access, &stp->st_access_bmap);
488}
489
490/* test whether a given stateid has access */
491static inline bool
492test_access(u32 access, struct nfs4_ol_stateid *stp)
493{
494 return test_bit(access, &stp->st_access_bmap);
495}
496
ce0fc43c
JL		 497/* set share deny for a given stateid */
498static inline void
499set_deny(u32 access, struct nfs4_ol_stateid *stp)
500{
501 __set_bit(access, &stp->st_deny_bmap);
502}
503
504/* clear share deny for a given stateid */
505static inline void
506clear_deny(u32 access, struct nfs4_ol_stateid *stp)
507{
508 __clear_bit(access, &stp->st_deny_bmap);
509}
510
511/* test whether a given stateid is denying specific access */
512static inline bool
513test_deny(u32 access, struct nfs4_ol_stateid *stp)
514{
515 return test_bit(access, &stp->st_deny_bmap);
f9d7562f
BF		 516}
517
518static int nfs4_access_to_omode(u32 access)
519{
8f34a430 520 switch (access & NFS4_SHARE_ACCESS_BOTH) {
f9d7562f
BF		 521 case NFS4_SHARE_ACCESS_READ:
522 return O_RDONLY;
523 case NFS4_SHARE_ACCESS_WRITE:
524 return O_WRONLY;
525 case NFS4_SHARE_ACCESS_BOTH:
526 return O_RDWR;
527 }
528 BUG();
529}
530
82c5ff1b
JL		 531/* release all access and file references for a given stateid */
532static void
533release_all_access(struct nfs4_ol_stateid *stp)
534{
535 int i;
536
537 for (i = 1; i < 4; i++) {
538 if (test_access(i, stp))
539 nfs4_file_put_access(stp->st_file,
540 nfs4_access_to_omode(i));
541 clear_access(i, stp);
542 }
543}
544
dcef0413 545static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
529d7b2a 546{
529d7b2a
BF		 547 list_del(&stp->st_perfile);
548 list_del(&stp->st_perstateowner);
549}
550
dcef0413 551static void close_generic_stateid(struct nfs4_ol_stateid *stp)
529d7b2a 552{
82c5ff1b 553 release_all_access(stp);
a96e5b90 554 put_nfs4_file(stp->st_file);
4665e2ba
BF		 555 stp->st_file = NULL;
556}
557
dcef0413 558static void free_generic_stateid(struct nfs4_ol_stateid *stp)
4665e2ba 559{
529d7b2a
BF		 560 kmem_cache_free(stateid_slab, stp);
561}
562
dcef0413 563static void release_lock_stateid(struct nfs4_ol_stateid *stp)
529d7b2a
BF		 564{
565 struct file *file;
566
567 unhash_generic_stateid(stp);
6136d2b4 568 unhash_stid(&stp->st_stid);
529d7b2a
BF		 569 file = find_any_file(stp->st_file);
570 if (file)
fe0750e5 571 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
38c387b5 572 close_generic_stateid(stp);
529d7b2a
BF		 573 free_generic_stateid(stp);
574}
575
fe0750e5 576static void unhash_lockowner(struct nfs4_lockowner *lo)
529d7b2a 577{
dcef0413 578 struct nfs4_ol_stateid *stp;
529d7b2a 579
fe0750e5
BF		 580 list_del(&lo->lo_owner.so_strhash);
581 list_del(&lo->lo_perstateid);
009673b4 582 list_del(&lo->lo_owner_ino_hash);
fe0750e5
BF		 583 while (!list_empty(&lo->lo_owner.so_stateids)) {
584 stp = list_first_entry(&lo->lo_owner.so_stateids,
dcef0413 585 struct nfs4_ol_stateid, st_perstateowner);
529d7b2a
BF		 586 release_lock_stateid(stp);
587 }
588}
589
fe0750e5 590static void release_lockowner(struct nfs4_lockowner *lo)
529d7b2a 591{
fe0750e5
BF		 592 unhash_lockowner(lo);
593 nfs4_free_lockowner(lo);
529d7b2a
BF		 594}
595
596static void
dcef0413 597release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
529d7b2a 598{
fe0750e5 599 struct nfs4_lockowner *lo;
529d7b2a
BF		 600
601 while (!list_empty(&open_stp->st_lockowners)) {
fe0750e5
BF		 602 lo = list_entry(open_stp->st_lockowners.next,
603 struct nfs4_lockowner, lo_perstateid);
604 release_lockowner(lo);
529d7b2a
BF		 605 }
606}
607
38c387b5 608static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
2283963f
BF		 609{
610 unhash_generic_stateid(stp);
611 release_stateid_lockowners(stp);
38c387b5
BF		 612 close_generic_stateid(stp);
613}
614
615static void release_open_stateid(struct nfs4_ol_stateid *stp)
616{
617 unhash_open_stateid(stp);
6136d2b4 618 unhash_stid(&stp->st_stid);
2283963f
BF		 619 free_generic_stateid(stp);
620}
621
fe0750e5 622static void unhash_openowner(struct nfs4_openowner *oo)
f1d110ca 623{
dcef0413 624 struct nfs4_ol_stateid *stp;
f1d110ca 625
fe0750e5
BF		 626 list_del(&oo->oo_owner.so_strhash);
627 list_del(&oo->oo_perclient);
628 while (!list_empty(&oo->oo_owner.so_stateids)) {
629 stp = list_first_entry(&oo->oo_owner.so_stateids,
dcef0413 630 struct nfs4_ol_stateid, st_perstateowner);
f044ff83 631 release_open_stateid(stp);
f1d110ca
BF		 632 }
633}
634
f7a4d872
BF		 635static void release_last_closed_stateid(struct nfs4_openowner *oo)
636{
637 struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
638
639 if (s) {
6136d2b4 640 unhash_stid(&s->st_stid);
f7a4d872
BF		 641 free_generic_stateid(s);
642 oo->oo_last_closed_stid = NULL;
643 }
644}
645
fe0750e5 646static void release_openowner(struct nfs4_openowner *oo)
f1d110ca 647{
fe0750e5
BF		 648 unhash_openowner(oo);
649 list_del(&oo->oo_close_lru);
f7a4d872 650 release_last_closed_stateid(oo);
fe0750e5 651 nfs4_free_openowner(oo);
f1d110ca
BF		 652}
653
5282fd72
ME		 654#define SESSION_HASH_SIZE 512
655static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
656
657static inline int
658hash_sessionid(struct nfs4_sessionid *sessionid)
659{
660 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
661
662 return sid->sequence % SESSION_HASH_SIZE;
663}
664
8f199b82 665#ifdef NFSD_DEBUG
5282fd72
ME		 666static inline void
667dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
668{
669 u32 *ptr = (u32 *)(&sessionid->data[0]);
670 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
671}
8f199b82
TM		 672#else
673static inline void
674dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
675{
676}
677#endif
678
5282fd72 679
ec6b5d7b
AA		 680static void
681gen_sessionid(struct nfsd4_session *ses)
682{
683 struct nfs4_client *clp = ses->se_client;
684 struct nfsd4_sessionid *sid;
685
686 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
687 sid->clientid = clp->cl_clientid;
688 sid->sequence = current_sessionid++;
689 sid->reserved = 0;
690}
691
692/*
a649637c
AA		 693 * The protocol defines ca_maxresponssize_cached to include the size of
694 * the rpc header, but all we need to cache is the data starting after
695 * the end of the initial SEQUENCE operation--the rest we regenerate
696 * each time. Therefore we can advertise a ca_maxresponssize_cached
697 * value that is the number of bytes in our cache plus a few additional
698 * bytes. In order to stay on the safe side, and not promise more than
699 * we can cache, those additional bytes must be the minimum possible: 24
700 * bytes of rpc header (xid through accept state, with AUTH_NULL
701 * verifier), 12 for the compound header (with zero-length tag), and 44
702 * for the SEQUENCE op response:
703 */
704#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
705
557ce264
AA		 706static void
707free_session_slots(struct nfsd4_session *ses)
708{
709 int i;
710
711 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
712 kfree(ses->se_slots[i]);
713}
714
a649637c 715/*
efe0cb6d
BF		 716 * We don't actually need to cache the rpc and session headers, so we
717 * can allocate a little less for each slot:
718 */
719static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
720{
721 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
722}
723
5b6feee9 724static int nfsd4_sanitize_slot_size(u32 size)
ec6b5d7b 725{
5b6feee9
BF		 726 size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
727 size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
ec6b5d7b 728
5b6feee9
BF		 729 return size;
730}
ec6b5d7b 731
5b6feee9
BF		 732/*
733 * XXX: If we run out of reserved DRC memory we could (up to a point)
a649637c 734 * re-negotiate active sessions and reduce their slot usage to make
42b2aa86 735 * room for new connections. For now we just fail the create session.
ec6b5d7b 736 */
5b6feee9 737static int nfsd4_get_drc_mem(int slotsize, u32 num)
ec6b5d7b 738{
5b6feee9 739 int avail;
ec6b5d7b 740
5b6feee9 741 num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
5d77ddfb 742
5b6feee9
BF		 743 spin_lock(&nfsd_drc_lock);
744 avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
745 nfsd_drc_max_mem - nfsd_drc_mem_used);
746 num = min_t(int, num, avail / slotsize);
747 nfsd_drc_mem_used += num * slotsize;
748 spin_unlock(&nfsd_drc_lock);
ec6b5d7b 749
5b6feee9
BF		 750 return num;
751}
ec6b5d7b 752
5b6feee9
BF		 753static void nfsd4_put_drc_mem(int slotsize, int num)
754{
4bd9b0f4 755 spin_lock(&nfsd_drc_lock);
5b6feee9 756 nfsd_drc_mem_used -= slotsize * num;
4bd9b0f4 757 spin_unlock(&nfsd_drc_lock);
5b6feee9 758}
ec6b5d7b 759
5b6feee9
BF		 760static struct nfsd4_session *alloc_session(int slotsize, int numslots)
761{
762 struct nfsd4_session *new;
763 int mem, i;
a649637c 764
5b6feee9
BF		 765 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
766 + sizeof(struct nfsd4_session) > PAGE_SIZE);
767 mem = numslots * sizeof(struct nfsd4_slot *);
ec6b5d7b 768
5b6feee9
BF		 769 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
770 if (!new)
771 return NULL;
557ce264 772 /* allocate each struct nfsd4_slot and data cache in one piece */
5b6feee9
BF		 773 for (i = 0; i < numslots; i++) {
774 mem = sizeof(struct nfsd4_slot) + slotsize;
775 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
776 if (!new->se_slots[i])
557ce264 777 goto out_free;
557ce264 778 }
5b6feee9
BF		 779 return new;
780out_free:
781 while (i--)
782 kfree(new->se_slots[i]);
783 kfree(new);
784 return NULL;
ec6b5d7b
AA		 785}
786
5b6feee9 787static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
ec6b5d7b 788{
5b6feee9 789 u32 maxrpc = nfsd_serv->sv_max_mesg;
ec6b5d7b 790
5b6feee9 791 new->maxreqs = numslots;
d2b21743
MJ		 792 new->maxresp_cached = min_t(u32, req->maxresp_cached,
793 slotsize + NFSD_MIN_HDR_SEQ_SZ);
5b6feee9
BF		 794 new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
795 new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
796 new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
797}
ec6b5d7b 798
19cf5c02
BF		 799static void free_conn(struct nfsd4_conn *c)
800{
801 svc_xprt_put(c->cn_xprt);
802 kfree(c);
803}
ec6b5d7b 804
19cf5c02
BF		 805static void nfsd4_conn_lost(struct svc_xpt_user *u)
806{
807 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
808 struct nfs4_client *clp = c->cn_session->se_client;
ec6b5d7b 809
19cf5c02
BF		 810 spin_lock(&clp->cl_lock);
811 if (!list_empty(&c->cn_persession)) {
812 list_del(&c->cn_persession);
813 free_conn(c);
814 }
815 spin_unlock(&clp->cl_lock);
eea49806 816 nfsd4_probe_callback(clp);
19cf5c02 817}
ec6b5d7b 818
d29c374c 819static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
c7662518 820{
c7662518 821 struct nfsd4_conn *conn;
ec6b5d7b 822
c7662518
BF		 823 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
824 if (!conn)
db90681d 825 return NULL;
c7662518
BF		 826 svc_xprt_get(rqstp->rq_xprt);
827 conn->cn_xprt = rqstp->rq_xprt;
d29c374c 828 conn->cn_flags = flags;
db90681d
BF		 829 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
830 return conn;
831}
a649637c 832
328ead28
BF		 833static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
834{
835 conn->cn_session = ses;
836 list_add(&conn->cn_persession, &ses->se_conns);
ec6b5d7b
AA		 837}
838
db90681d 839static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
557ce264 840{
db90681d 841 struct nfs4_client *clp = ses->se_client;
557ce264 842
c7662518 843 spin_lock(&clp->cl_lock);
328ead28 844 __nfsd4_hash_conn(conn, ses);
c7662518 845 spin_unlock(&clp->cl_lock);
557ce264
AA		 846}
847
21b75b01 848static int nfsd4_register_conn(struct nfsd4_conn *conn)
efe0cb6d 849{
19cf5c02 850 conn->cn_xpt_user.callback = nfsd4_conn_lost;
21b75b01 851 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
efe0cb6d
BF		 852}
853
1d1bc8f2 854static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses, u32 dir)
ec6b5d7b 855{
db90681d 856 struct nfsd4_conn *conn;
21b75b01 857 int ret;
ec6b5d7b 858
1d1bc8f2 859 conn = alloc_conn(rqstp, dir);
db90681d
BF		 860 if (!conn)
861 return nfserr_jukebox;
862 nfsd4_hash_conn(conn, ses);
21b75b01
BF		 863 ret = nfsd4_register_conn(conn);
864 if (ret)
865 /* oops; xprt is already down: */
866 nfsd4_conn_lost(&conn->cn_xpt_user);
24119673
WAA		 867 if (ses->se_client->cl_cb_state == NFSD4_CB_DOWN &&
868 dir & NFS4_CDFC4_BACK) {
869 /* callback channel may be back up */
870 nfsd4_probe_callback(ses->se_client);
871 }
c7662518
BF		 872 return nfs_ok;
873}
ec6b5d7b 874
1d1bc8f2
BF		 875static __be32 nfsd4_new_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_session *ses)
876{
877 u32 dir = NFS4_CDFC4_FORE;
878
879 if (ses->se_flags & SESSION4_BACK_CHAN)
880 dir |= NFS4_CDFC4_BACK;
881
882 return nfsd4_new_conn(rqstp, ses, dir);
883}
884
885/* must be called under client_lock */
19cf5c02 886static void nfsd4_del_conns(struct nfsd4_session *s)
c7662518 887{
19cf5c02
BF		 888 struct nfs4_client *clp = s->se_client;
889 struct nfsd4_conn *c;
ec6b5d7b 890
19cf5c02
BF		 891 spin_lock(&clp->cl_lock);
892 while (!list_empty(&s->se_conns)) {
893 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
894 list_del_init(&c->cn_persession);
895 spin_unlock(&clp->cl_lock);
557ce264 896
19cf5c02
BF		 897 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
898 free_conn(c);
ec6b5d7b 899
19cf5c02
BF		 900 spin_lock(&clp->cl_lock);
901 }
902 spin_unlock(&clp->cl_lock);
c7662518 903}
ec6b5d7b 904
508dc6e1 905static void free_session(struct kref *kref)
c7662518
BF		 906{
907 struct nfsd4_session *ses;
908 int mem;
909
bc2df47a 910 lockdep_assert_held(&client_lock);
c7662518 911 ses = container_of(kref, struct nfsd4_session, se_ref);
19cf5c02 912 nfsd4_del_conns(ses);
c7662518
BF		 913 spin_lock(&nfsd_drc_lock);
914 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
915 nfsd_drc_mem_used -= mem;
916 spin_unlock(&nfsd_drc_lock);
917 free_session_slots(ses);
918 kfree(ses);
919}
920
508dc6e1
BH		 921void nfsd4_put_session(struct nfsd4_session *ses)
922{
923 spin_lock(&client_lock);
924 nfsd4_put_session_locked(ses);
925 spin_unlock(&client_lock);
926}
927
ac7c46f2 928static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
5b6feee9
BF		 929{
930 struct nfsd4_session *new;
931 struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
932 int numslots, slotsize;
57b7b43b 933 __be32 status;
5b6feee9
BF		 934 int idx;
935
936 /*
937 * Note decreasing slot size below client's request may
938 * make it difficult for client to function correctly, whereas
939 * decreasing the number of slots will (just?) affect
940 * performance. When short on memory we therefore prefer to
941 * decrease number of slots instead of their size.
942 */
943 slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
944 numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
ced6dfe9
MJ		 945 if (numslots < 1)
946 return NULL;
5b6feee9
BF		 947
948 new = alloc_session(slotsize, numslots);
949 if (!new) {
950 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
ac7c46f2 951 return NULL;
557ce264 952 }
5b6feee9 953 init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
557ce264 954
ec6b5d7b
AA		 955 new->se_client = clp;
956 gen_sessionid(new);
ec6b5d7b 957
c7662518
BF		 958 INIT_LIST_HEAD(&new->se_conns);
959
ac7c46f2 960 new->se_cb_seq_nr = 1;
ec6b5d7b 961 new->se_flags = cses->flags;
8b5ce5cd 962 new->se_cb_prog = cses->callback_prog;
ec6b5d7b 963 kref_init(&new->se_ref);
5b6feee9 964 idx = hash_sessionid(&new->se_sessionid);
9089f1b4 965 spin_lock(&client_lock);
ec6b5d7b 966 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
4c649378 967 spin_lock(&clp->cl_lock);
ec6b5d7b 968 list_add(&new->se_perclnt, &clp->cl_sessions);
4c649378 969 spin_unlock(&clp->cl_lock);
9089f1b4 970 spin_unlock(&client_lock);
ec6b5d7b 971
1d1bc8f2 972 status = nfsd4_new_conn_from_crses(rqstp, new);
ac7c46f2 973 /* whoops: benny points out, status is ignored! (err, or bogus) */
c7662518 974 if (status) {
508dc6e1 975 spin_lock(&client_lock);
c7662518 976 free_session(&new->se_ref);
508dc6e1 977 spin_unlock(&client_lock);
ac7c46f2 978 return NULL;
c7662518 979 }
dcbeaa68 980 if (cses->flags & SESSION4_BACK_CHAN) {
edd76786 981 struct sockaddr *sa = svc_addr(rqstp);
dcbeaa68
BF		 982 /*
983 * This is a little silly; with sessions there's no real
984 * use for the callback address. Use the peer address
985 * as a reasonable default for now, but consider fixing
986 * the rpc client not to require an address in the
987 * future:
988 */
edd76786
BF		 989 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
990 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
edd76786 991 }
dcbeaa68 992 nfsd4_probe_callback(clp);
ac7c46f2 993 return new;
ec6b5d7b
AA		 994}
995
9089f1b4 996/* caller must hold client_lock */
5282fd72
ME		 997static struct nfsd4_session *
998find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
999{
1000 struct nfsd4_session *elem;
1001 int idx;
1002
1003 dump_sessionid(__func__, sessionid);
1004 idx = hash_sessionid(sessionid);
5282fd72
ME		 1005 /* Search in the appropriate list */
1006 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
5282fd72
ME		 1007 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1008 NFS4_MAX_SESSIONID_LEN)) {
1009 return elem;
1010 }
1011 }
1012
1013 dprintk("%s: session not found\n", __func__);
1014 return NULL;
1015}
1016
9089f1b4 1017/* caller must hold client_lock */
7116ed6b 1018static void
5282fd72 1019unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 1020{
1021 list_del(&ses->se_hash);
4c649378 1022 spin_lock(&ses->se_client->cl_lock);
7116ed6b 1023 list_del(&ses->se_perclnt);
4c649378 1024 spin_unlock(&ses->se_client->cl_lock);
5282fd72
ME		 1025}
1026
36acb66b 1027/* must be called under the client_lock */
1da177e4 1028static inline void
36acb66b 1029renew_client_locked(struct nfs4_client *clp)
1da177e4 1030{
07cd4909 1031 if (is_client_expired(clp)) {
7447758b
BF		 1032 WARN_ON(1);
1033 printk("%s: client (clientid %08x/%08x) already expired\n",
07cd4909
BH		 1034 __func__,
1035 clp->cl_clientid.cl_boot,
1036 clp->cl_clientid.cl_id);
1037 return;
1038 }
1039
1da177e4
LT		 1040 dprintk("renewing client (clientid %08x/%08x)\n",
1041 clp->cl_clientid.cl_boot,
1042 clp->cl_clientid.cl_id);
1043 list_move_tail(&clp->cl_lru, &client_lru);
1044 clp->cl_time = get_seconds();
1045}
1046
36acb66b
BH		 1047static inline void
1048renew_client(struct nfs4_client *clp)
1049{
1050 spin_lock(&client_lock);
1051 renew_client_locked(clp);
1052 spin_unlock(&client_lock);
1053}
1054
1da177e4
LT		 1055/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1056static int
1057STALE_CLIENTID(clientid_t *clid)
1058{
1059 if (clid->cl_boot == boot_time)
1060 return 0;
60adfc50
AA		 1061 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1062 clid->cl_boot, clid->cl_id, boot_time);
1da177e4
LT		 1063 return 1;
1064}
1065
1066/*
1067 * XXX Should we use a slab cache ?
1068 * This type of memory management is somewhat inefficient, but we use it
1069 * anyway since SETCLIENTID is not a common operation.
1070 */
35bba9a3 1071static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 1072{
1073 struct nfs4_client *clp;
1074
35bba9a3
BF		 1075 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1076 if (clp == NULL)
1077 return NULL;
67114fe6 1078 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
35bba9a3
BF		 1079 if (clp->cl_name.data == NULL) {
1080 kfree(clp);
1081 return NULL;
1da177e4 1082 }
35bba9a3 1083 clp->cl_name.len = name.len;
1da177e4
LT		 1084 return clp;
1085}
1086
1087static inline void
1088free_client(struct nfs4_client *clp)
1089{
bc2df47a 1090 lockdep_assert_held(&client_lock);
792c95dd
BF		 1091 while (!list_empty(&clp->cl_sessions)) {
1092 struct nfsd4_session *ses;
1093 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1094 se_perclnt);
1095 list_del(&ses->se_perclnt);
508dc6e1 1096 nfsd4_put_session_locked(ses);
792c95dd 1097 }
03a4e1f6 1098 free_svc_cred(&clp->cl_cred);
1da177e4
LT		 1099 kfree(clp->cl_name.data);
1100 kfree(clp);
1101}
1102
d7682988
BH		 1103void
1104release_session_client(struct nfsd4_session *session)
1105{
1106 struct nfs4_client *clp = session->se_client;
1107
1108 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1109 return;
1110 if (is_client_expired(clp)) {
1111 free_client(clp);
1112 session->se_client = NULL;
1113 } else
1114 renew_client_locked(clp);
1115 spin_unlock(&client_lock);
d7682988
BH		 1116}
1117
84d38ac9
BH		 1118/* must be called under the client_lock */
1119static inline void
1120unhash_client_locked(struct nfs4_client *clp)
1121{
792c95dd
BF		 1122 struct nfsd4_session *ses;
1123
07cd4909 1124 mark_client_expired(clp);
84d38ac9 1125 list_del(&clp->cl_lru);
4c649378 1126 spin_lock(&clp->cl_lock);
792c95dd
BF		 1127 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1128 list_del_init(&ses->se_hash);
4c649378 1129 spin_unlock(&clp->cl_lock);
84d38ac9
BH		 1130}
1131
1da177e4
LT		 1132static void
1133expire_client(struct nfs4_client *clp)
1134{
fe0750e5 1135 struct nfs4_openowner *oo;
1da177e4 1136 struct nfs4_delegation *dp;
1da177e4
LT		 1137 struct list_head reaplist;
1138
1da177e4
LT		 1139 INIT_LIST_HEAD(&reaplist);
1140 spin_lock(&recall_lock);
ea1da636
N		 1141 while (!list_empty(&clp->cl_delegations)) {
1142 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
ea1da636 1143 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 1144 list_move(&dp->dl_recall_lru, &reaplist);
1145 }
1146 spin_unlock(&recall_lock);
1147 while (!list_empty(&reaplist)) {
1148 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1da177e4
LT		 1149 unhash_delegation(dp);
1150 }
ea1da636 1151 while (!list_empty(&clp->cl_openowners)) {
fe0750e5
BF		 1152 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1153 release_openowner(oo);
1da177e4 1154 }
6ff8da08 1155 nfsd4_shutdown_callback(clp);
84d38ac9
BH		 1156 if (clp->cl_cb_conn.cb_xprt)
1157 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
36acb66b
BH		 1158 list_del(&clp->cl_idhash);
1159 list_del(&clp->cl_strhash);
be1fdf6c 1160 spin_lock(&client_lock);
84d38ac9 1161 unhash_client_locked(clp);
46583e25
BH		 1162 if (atomic_read(&clp->cl_refcount) == 0)
1163 free_client(clp);
be1fdf6c 1164 spin_unlock(&client_lock);
1da177e4
LT		 1165}
1166
35bba9a3
BF		 1167static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1168{
1169 memcpy(target->cl_verifier.data, source->data,
1170 sizeof(target->cl_verifier.data));
1da177e4
LT		 1171}
1172
35bba9a3
BF		 1173static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1174{
1da177e4
LT		 1175 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1176 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1177}
1178
03a4e1f6 1179static int copy_cred(struct svc_cred *target, struct svc_cred *source)
35bba9a3 1180{
03a4e1f6
BF		 1181 if (source->cr_principal) {
1182 target->cr_principal =
1183 kstrdup(source->cr_principal, GFP_KERNEL);
1184 if (target->cr_principal == NULL)
1185 return -ENOMEM;
1186 } else
1187 target->cr_principal = NULL;
d5497fc6 1188 target->cr_flavor = source->cr_flavor;
1da177e4
LT		 1189 target->cr_uid = source->cr_uid;
1190 target->cr_gid = source->cr_gid;
1191 target->cr_group_info = source->cr_group_info;
1192 get_group_info(target->cr_group_info);
03a4e1f6 1193 return 0;
1da177e4
LT		 1194}
1195
35bba9a3 1196static int same_name(const char *n1, const char *n2)
599e0a22 1197{
a55370a3 1198 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 1199}
1200
1201static int
599e0a22
BF		 1202same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1203{
1204 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 1205}
1206
1207static int
599e0a22
BF		 1208same_clid(clientid_t *cl1, clientid_t *cl2)
1209{
1210 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 1211}
1212
8fbba96e
BF		 1213static bool groups_equal(struct group_info *g1, struct group_info *g2)
1214{
1215 int i;
1216
1217 if (g1->ngroups != g2->ngroups)
1218 return false;
1219 for (i=0; i<g1->ngroups; i++)
1220 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1221 return false;
1222 return true;
1223}
1224
5559b50a 1225static bool
599e0a22
BF		 1226same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1227{
d5497fc6
BF		 1228 if ((cr1->cr_flavor != cr2->cr_flavor)
1229 || (cr1->cr_uid != cr2->cr_uid)
8fbba96e
BF		 1230 || (cr1->cr_gid != cr2->cr_gid)
1231 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1232 return false;
1233 if (cr1->cr_principal == cr2->cr_principal)
1234 return true;
1235 if (!cr1->cr_principal || !cr2->cr_principal)
1236 return false;
5559b50a 1237 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1da177e4
LT		 1238}
1239
5ec7b46c
BF		 1240static void gen_clid(struct nfs4_client *clp)
1241{
1242 static u32 current_clientid = 1;
1243
1da177e4
LT		 1244 clp->cl_clientid.cl_boot = boot_time;
1245 clp->cl_clientid.cl_id = current_clientid++;
1246}
1247
deda2faa
BF		 1248static void gen_confirm(struct nfs4_client *clp)
1249{
ab4684d1 1250 __be32 verf[2];
deda2faa 1251 static u32 i;
1da177e4 1252
ab4684d1
CL		 1253 verf[0] = (__be32)get_seconds();
1254 verf[1] = (__be32)i++;
1255 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1da177e4
LT		 1256}
1257
38c2f4b1 1258static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
4581d140 1259{
38c2f4b1 1260 return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
4d71ab87
BF		 1261}
1262
38c2f4b1 1263static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
f459e453
BF		 1264{
1265 struct nfs4_stid *s;
4d71ab87 1266
38c2f4b1 1267 s = find_stateid(cl, t);
4d71ab87
BF		 1268 if (!s)
1269 return NULL;
f459e453 1270 if (typemask & s->sc_type)
4581d140 1271 return s;
4581d140
BF		 1272 return NULL;
1273}
1274
b09333c4
RL		 1275static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
1276 struct svc_rqst *rqstp, nfs4_verifier *verf)
1277{
1278 struct nfs4_client *clp;
1279 struct sockaddr *sa = svc_addr(rqstp);
03a4e1f6 1280 int ret;
b09333c4
RL		 1281
1282 clp = alloc_client(name);
1283 if (clp == NULL)
1284 return NULL;
1285
792c95dd 1286 INIT_LIST_HEAD(&clp->cl_sessions);
03a4e1f6
BF		 1287 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1288 if (ret) {
1289 spin_lock(&client_lock);
1290 free_client(clp);
1291 spin_unlock(&client_lock);
1292 return NULL;
b09333c4 1293 }
38c2f4b1 1294 idr_init(&clp->cl_stateids);
b09333c4 1295 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
46583e25 1296 atomic_set(&clp->cl_refcount, 0);
77a3569d 1297 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
b09333c4
RL		 1298 INIT_LIST_HEAD(&clp->cl_idhash);
1299 INIT_LIST_HEAD(&clp->cl_strhash);
1300 INIT_LIST_HEAD(&clp->cl_openowners);
1301 INIT_LIST_HEAD(&clp->cl_delegations);
b09333c4 1302 INIT_LIST_HEAD(&clp->cl_lru);
5ce8ba25 1303 INIT_LIST_HEAD(&clp->cl_callbacks);
6ff8da08 1304 spin_lock_init(&clp->cl_lock);
cee277d9 1305 INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
07cd4909 1306 clp->cl_time = get_seconds();
b09333c4
RL		 1307 clear_bit(0, &clp->cl_cb_slot_busy);
1308 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1309 copy_verf(clp, verf);
1310 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
b09333c4 1311 gen_confirm(clp);
edd76786 1312 clp->cl_cb_session = NULL;
b09333c4
RL		 1313 return clp;
1314}
1315
fd39ca9a 1316static void
1da177e4
LT		 1317add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1318{
1319 unsigned int idhashval;
1320
1321 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1322 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1323 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
36acb66b 1324 renew_client(clp);
1da177e4
LT		 1325}
1326
fd39ca9a 1327static void
1da177e4
LT		 1328move_to_confirmed(struct nfs4_client *clp)
1329{
1330 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1331 unsigned int strhashval;
1332
1333 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
f116629d 1334 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 1335 strhashval = clientstr_hashval(clp->cl_recdir);
328efbab 1336 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1da177e4
LT		 1337 renew_client(clp);
1338}
1339
1340static struct nfs4_client *
1341find_confirmed_client(clientid_t *clid)
1342{
1343 struct nfs4_client *clp;
1344 unsigned int idhashval = clientid_hashval(clid->cl_id);
1345
1346 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
a50d2ad1
BF		 1347 if (same_clid(&clp->cl_clientid, clid)) {
1348 renew_client(clp);
1da177e4 1349 return clp;
a50d2ad1 1350 }
1da177e4
LT		 1351 }
1352 return NULL;
1353}
1354
1355static struct nfs4_client *
1356find_unconfirmed_client(clientid_t *clid)
1357{
1358 struct nfs4_client *clp;
1359 unsigned int idhashval = clientid_hashval(clid->cl_id);
1360
1361 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 1362 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 1363 return clp;
1364 }
1365 return NULL;
1366}
1367
6e5f15c9 1368static bool clp_used_exchangeid(struct nfs4_client *clp)
a1bcecd2 1369{
6e5f15c9 1370 return clp->cl_exchange_flags != 0;
e203d506 1371}
a1bcecd2 1372
28ce6054 1373static struct nfs4_client *
e203d506 1374find_confirmed_client_by_str(const char *dname, unsigned int hashval)
28ce6054
N		 1375{
1376 struct nfs4_client *clp;
1377
1378 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
e203d506 1379 if (same_name(clp->cl_recdir, dname))
28ce6054
N		 1380 return clp;
1381 }
1382 return NULL;
1383}
1384
1385static struct nfs4_client *
e203d506 1386find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
28ce6054
N		 1387{
1388 struct nfs4_client *clp;
1389
1390 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
e203d506 1391 if (same_name(clp->cl_recdir, dname))
28ce6054
N		 1392 return clp;
1393 }
1394 return NULL;
1395}
1396
fd39ca9a 1397static void
6f3d772f 1398gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1da177e4 1399{
07263f1e 1400 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
6f3d772f
TU		 1401 struct sockaddr *sa = svc_addr(rqstp);
1402 u32 scopeid = rpc_get_scope_id(sa);
7077ecba
JL		 1403 unsigned short expected_family;
1404
1405 /* Currently, we only support tcp and tcp6 for the callback channel */
1406 if (se->se_callback_netid_len == 3 &&
1407 !memcmp(se->se_callback_netid_val, "tcp", 3))
1408 expected_family = AF_INET;
1409 else if (se->se_callback_netid_len == 4 &&
1410 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1411 expected_family = AF_INET6;
1412 else
1da177e4
LT		 1413 goto out_err;
1414
f2ac4dc9 1415 conn->cb_addrlen = rpc_uaddr2sockaddr(&init_net, se->se_callback_addr_val,
aa9a4ec7 1416 se->se_callback_addr_len,
07263f1e
BF		 1417 (struct sockaddr *)&conn->cb_addr,
1418 sizeof(conn->cb_addr));
aa9a4ec7 1419
07263f1e 1420 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1da177e4 1421 goto out_err;
aa9a4ec7 1422
07263f1e
BF		 1423 if (conn->cb_addr.ss_family == AF_INET6)
1424 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
fbf4665f 1425
07263f1e
BF		 1426 conn->cb_prog = se->se_callback_prog;
1427 conn->cb_ident = se->se_callback_ident;
849a1cf1 1428 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1da177e4
LT		 1429 return;
1430out_err:
07263f1e
BF		 1431 conn->cb_addr.ss_family = AF_UNSPEC;
1432 conn->cb_addrlen = 0;
849823c5 1433 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 1434 "will not receive delegations\n",
1435 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1436
1da177e4
LT		 1437 return;
1438}
1439
074fe897 1440/*
557ce264 1441 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
074fe897 1442 */
074fe897
AA		 1443void
1444nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
074fe897 1445{
557ce264
AA		 1446 struct nfsd4_slot *slot = resp->cstate.slot;
1447 unsigned int base;
074fe897 1448
557ce264 1449 dprintk("--> %s slot %p\n", __func__, slot);
074fe897 1450
557ce264
AA		 1451 slot->sl_opcnt = resp->opcnt;
1452 slot->sl_status = resp->cstate.status;
074fe897 1453
bf5c43c8 1454 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
bf864a31 1455 if (nfsd4_not_cached(resp)) {
557ce264 1456 slot->sl_datalen = 0;
bf864a31 1457 return;
074fe897 1458 }
557ce264
AA		 1459 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1460 base = (char *)resp->cstate.datap -
1461 (char *)resp->xbuf->head[0].iov_base;
1462 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1463 slot->sl_datalen))
1464 WARN("%s: sessions DRC could not cache compound\n", __func__);
1465 return;
074fe897
AA		 1466}
1467
1468/*
abfabf8c
AA		 1469 * Encode the replay sequence operation from the slot values.
1470 * If cachethis is FALSE encode the uncached rep error on the next
1471 * operation which sets resp->p and increments resp->opcnt for
1472 * nfs4svc_encode_compoundres.
074fe897 1473 *
074fe897 1474 */
abfabf8c
AA		 1475static __be32
1476nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1477 struct nfsd4_compoundres *resp)
074fe897 1478{
abfabf8c
AA		 1479 struct nfsd4_op *op;
1480 struct nfsd4_slot *slot = resp->cstate.slot;
bf864a31 1481
abfabf8c
AA		 1482 /* Encode the replayed sequence operation */
1483 op = &args->ops[resp->opcnt - 1];
1484 nfsd4_encode_operation(resp, op);
bf864a31 1485
abfabf8c 1486 /* Return nfserr_retry_uncached_rep in next operation. */
73e79482 1487 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
abfabf8c
AA		 1488 op = &args->ops[resp->opcnt++];
1489 op->status = nfserr_retry_uncached_rep;
1490 nfsd4_encode_operation(resp, op);
074fe897 1491 }
abfabf8c 1492 return op->status;
074fe897
AA		 1493}
1494
1495/*
557ce264
AA		 1496 * The sequence operation is not cached because we can use the slot and
1497 * session values.
074fe897
AA		 1498 */
1499__be32
bf864a31
AA		 1500nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1501 struct nfsd4_sequence *seq)
074fe897 1502{
557ce264 1503 struct nfsd4_slot *slot = resp->cstate.slot;
074fe897
AA		 1504 __be32 status;
1505
557ce264 1506 dprintk("--> %s slot %p\n", __func__, slot);
074fe897 1507
abfabf8c
AA		 1508 /* Either returns 0 or nfserr_retry_uncached */
1509 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1510 if (status == nfserr_retry_uncached_rep)
1511 return status;
074fe897 1512
557ce264
AA		 1513 /* The sequence operation has been encoded, cstate->datap set. */
1514 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
074fe897 1515
557ce264
AA		 1516 resp->opcnt = slot->sl_opcnt;
1517 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1518 status = slot->sl_status;
074fe897
AA		 1519
1520 return status;
1521}
1522
0733d213
AA		 1523/*
1524 * Set the exchange_id flags returned by the server.
1525 */
1526static void
1527nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1528{
1529 /* pNFS is not supported */
1530 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1531
1532 /* Referrals are supported, Migration is not. */
1533 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1534
1535 /* set the wire flags to return to client. */
1536 clid->flags = new->cl_exchange_flags;
1537}
1538
631fc9ea
BF		 1539static bool client_has_state(struct nfs4_client *clp)
1540{
1541 /*
1542 * Note clp->cl_openowners check isn't quite right: there's no
1543 * need to count owners without stateid's.
1544 *
1545 * Also note we should probably be using this in 4.0 case too.
1546 */
6eccece9
BF		 1547 return !list_empty(&clp->cl_openowners)
1548 || !list_empty(&clp->cl_delegations)
1549 || !list_empty(&clp->cl_sessions);
631fc9ea
BF		 1550}
1551
069b6ad4
AA		 1552__be32
1553nfsd4_exchange_id(struct svc_rqst *rqstp,
1554 struct nfsd4_compound_state *cstate,
1555 struct nfsd4_exchange_id *exid)
1556{
0733d213 1557 struct nfs4_client *unconf, *conf, *new;
57b7b43b 1558 __be32 status;
0733d213
AA		 1559 unsigned int strhashval;
1560 char dname[HEXDIR_LEN];
363168b4 1561 char addr_str[INET6_ADDRSTRLEN];
0733d213 1562 nfs4_verifier verf = exid->verifier;
363168b4 1563 struct sockaddr *sa = svc_addr(rqstp);
83e08fd4 1564 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
0733d213 1565
363168b4 1566 rpc_ntop(sa, addr_str, sizeof(addr_str));
0733d213 1567 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
363168b4 1568 "ip_addr=%s flags %x, spa_how %d\n",
0733d213 1569 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
363168b4 1570 addr_str, exid->flags, exid->spa_how);
0733d213 1571
a084daf5 1572 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
0733d213
AA		 1573 return nfserr_inval;
1574
1575 /* Currently only support SP4_NONE */
1576 switch (exid->spa_how) {
1577 case SP4_NONE:
1578 break;
1579 case SP4_SSV:
044bc1d4 1580 return nfserr_serverfault;
0733d213
AA		 1581 default:
1582 BUG(); /* checked by xdr code */
1583 case SP4_MACH_CRED:
1584 return nfserr_serverfault; /* no excuse :-/ */
1585 }
1586
1587 status = nfs4_make_rec_clidname(dname, &exid->clname);
1588
1589 if (status)
2786cc3a 1590 return status;
0733d213
AA		 1591
1592 strhashval = clientstr_hashval(dname);
1593
2dbb269d 1594 /* Cases below refer to rfc 5661 section 18.35.4: */
0733d213 1595 nfs4_lock_state();
e203d506 1596 conf = find_confirmed_client_by_str(dname, strhashval);
0733d213 1597 if (conf) {
83e08fd4
BF		 1598 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1599 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1600
136e658d
BF		 1601 if (update) {
1602 if (!clp_used_exchangeid(conf)) { /* buggy client */
2dbb269d 1603 status = nfserr_inval;
1a308118
BF		 1604 goto out;
1605 }
136e658d 1606 if (!creds_match) { /* case 9 */
ea236d07 1607 status = nfserr_perm;
136e658d
BF		 1608 goto out;
1609 }
1610 if (!verfs_match) { /* case 8 */
0733d213
AA		 1611 status = nfserr_not_same;
1612 goto out;
1613 }
136e658d
BF		 1614 /* case 6 */
1615 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1616 new = conf;
1617 goto out_copy;
0733d213 1618 }
136e658d 1619 if (!creds_match) { /* case 3 */
631fc9ea
BF		 1620 if (client_has_state(conf)) {
1621 status = nfserr_clid_inuse;
0733d213
AA		 1622 goto out;
1623 }
1624 expire_client(conf);
1625 goto out_new;
1626 }
136e658d 1627 if (verfs_match) { /* case 2 */
0f1ba0ef 1628 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
136e658d
BF		 1629 new = conf;
1630 goto out_copy;
1631 }
1632 /* case 5, client reboot */
136e658d 1633 goto out_new;
6ddbbbfe
MS		 1634 }
1635
2dbb269d 1636 if (update) { /* case 7 */
6ddbbbfe
MS		 1637 status = nfserr_noent;
1638 goto out;
0733d213
AA		 1639 }
1640
e203d506 1641 unconf = find_unconfirmed_client_by_str(dname, strhashval);
2dbb269d 1642 if (unconf) /* case 4, possible retry or client restart */
0733d213 1643 expire_client(unconf);
0733d213 1644
2dbb269d 1645 /* case 1 (normal case) */
0733d213 1646out_new:
b09333c4 1647 new = create_client(exid->clname, dname, rqstp, &verf);
0733d213 1648 if (new == NULL) {
4731030d 1649 status = nfserr_jukebox;
0733d213
AA		 1650 goto out;
1651 }
1652
0733d213 1653 gen_clid(new);
0733d213
AA		 1654 add_to_unconfirmed(new, strhashval);
1655out_copy:
1656 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1657 exid->clientid.cl_id = new->cl_clientid.cl_id;
1658
778df3f0 1659 exid->seqid = new->cl_cs_slot.sl_seqid + 1;
0733d213
AA		 1660 nfsd4_set_ex_flags(new, exid);
1661
1662 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
49557cc7 1663 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
0733d213
AA		 1664 status = nfs_ok;
1665
1666out:
1667 nfs4_unlock_state();
0733d213 1668 return status;
069b6ad4
AA		 1669}
1670
57b7b43b 1671static __be32
88e588d5 1672check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
b85d4c01 1673{
88e588d5
AA		 1674 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1675 slot_seqid);
b85d4c01
BH		 1676
1677 /* The slot is in use, and no response has been sent. */
88e588d5
AA		 1678 if (slot_inuse) {
1679 if (seqid == slot_seqid)
b85d4c01
BH		 1680 return nfserr_jukebox;
1681 else
1682 return nfserr_seq_misordered;
1683 }
f6d82485 1684 /* Note unsigned 32-bit arithmetic handles wraparound: */
88e588d5 1685 if (likely(seqid == slot_seqid + 1))
b85d4c01 1686 return nfs_ok;
88e588d5 1687 if (seqid == slot_seqid)
b85d4c01 1688 return nfserr_replay_cache;
b85d4c01
BH		 1689 return nfserr_seq_misordered;
1690}
1691
49557cc7
AA		 1692/*
1693 * Cache the create session result into the create session single DRC
1694 * slot cache by saving the xdr structure. sl_seqid has been set.
1695 * Do this for solo or embedded create session operations.
1696 */
1697static void
1698nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
57b7b43b 1699 struct nfsd4_clid_slot *slot, __be32 nfserr)
49557cc7
AA		 1700{
1701 slot->sl_status = nfserr;
1702 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1703}
1704
1705static __be32
1706nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1707 struct nfsd4_clid_slot *slot)
1708{
1709 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1710 return slot->sl_status;
1711}
1712
1b74c25b
MJ		 1713#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1714 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1715 1 + /* MIN tag is length with zero, only length */ \
1716 3 + /* version, opcount, opcode */ \
1717 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1718 /* seqid, slotID, slotID, cache */ \
1719 4 ) * sizeof(__be32))
1720
1721#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1722 2 + /* verifier: AUTH_NULL, length 0 */\
1723 1 + /* status */ \
1724 1 + /* MIN tag is length with zero, only length */ \
1725 3 + /* opcount, opcode, opstatus*/ \
1726 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1727 /* seqid, slotID, slotID, slotID, status */ \
1728 5 ) * sizeof(__be32))
1729
57b7b43b 1730static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1b74c25b
MJ		 1731{
1732 return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1733 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1734}
1735
069b6ad4
AA		 1736__be32
1737nfsd4_create_session(struct svc_rqst *rqstp,
1738 struct nfsd4_compound_state *cstate,
1739 struct nfsd4_create_session *cr_ses)
1740{
363168b4 1741 struct sockaddr *sa = svc_addr(rqstp);
ec6b5d7b 1742 struct nfs4_client *conf, *unconf;
ac7c46f2 1743 struct nfsd4_session *new;
49557cc7 1744 struct nfsd4_clid_slot *cs_slot = NULL;
86c3e16c 1745 bool confirm_me = false;
57b7b43b 1746 __be32 status = 0;
ec6b5d7b 1747
a62573dc
MJ		 1748 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1749 return nfserr_inval;
1750
ec6b5d7b
AA		 1751 nfs4_lock_state();
1752 unconf = find_unconfirmed_client(&cr_ses->clientid);
1753 conf = find_confirmed_client(&cr_ses->clientid);
1754
1755 if (conf) {
49557cc7
AA		 1756 cs_slot = &conf->cl_cs_slot;
1757 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
38eb76a5 1758 if (status == nfserr_replay_cache) {
49557cc7 1759 status = nfsd4_replay_create_session(cr_ses, cs_slot);
38eb76a5 1760 goto out;
49557cc7 1761 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
ec6b5d7b 1762 status = nfserr_seq_misordered;
ec6b5d7b
AA		 1763 goto out;
1764 }
ec6b5d7b
AA		 1765 } else if (unconf) {
1766 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
363168b4 1767 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
ec6b5d7b
AA		 1768 status = nfserr_clid_inuse;
1769 goto out;
1770 }
49557cc7
AA		 1771 cs_slot = &unconf->cl_cs_slot;
1772 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
38eb76a5
AA		 1773 if (status) {
1774 /* an unconfirmed replay returns misordered */
ec6b5d7b 1775 status = nfserr_seq_misordered;
cd5b8144 1776 goto out;
ec6b5d7b 1777 }
86c3e16c 1778 confirm_me = true;
ec6b5d7b
AA		 1779 conf = unconf;
1780 } else {
1781 status = nfserr_stale_clientid;
1782 goto out;
1783 }
1784
8323c3b2
BF		 1785 /*
1786 * XXX: we should probably set this at creation time, and check
1787 * for consistent minorversion use throughout:
1788 */
1789 conf->cl_minorversion = 1;
408b79bc
BF		 1790 /*
1791 * We do not support RDMA or persistent sessions
1792 */
1793 cr_ses->flags &= ~SESSION4_PERSIST;
1794 cr_ses->flags &= ~SESSION4_RDMA;
1795
1b74c25b
MJ		 1796 status = nfserr_toosmall;
1797 if (check_forechannel_attrs(cr_ses->fore_channel))
1798 goto out;
1799
ac7c46f2
BF		 1800 status = nfserr_jukebox;
1801 new = alloc_init_session(rqstp, conf, cr_ses);
1802 if (!new)
ec6b5d7b 1803 goto out;
ac7c46f2
BF		 1804 status = nfs_ok;
1805 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
ec6b5d7b 1806 NFS4_MAX_SESSIONID_LEN);
12050657
MJ		 1807 memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1808 sizeof(struct nfsd4_channel_attrs));
86c3e16c 1809 cs_slot->sl_seqid++;
49557cc7 1810 cr_ses->seqid = cs_slot->sl_seqid;
ec6b5d7b 1811
49557cc7
AA		 1812 /* cache solo and embedded create sessions under the state lock */
1813 nfsd4_cache_create_session(cr_ses, cs_slot, status);
b9831b59
BF		 1814 if (confirm_me) {
1815 unsigned int hash = clientstr_hashval(unconf->cl_recdir);
1816 struct nfs4_client *old =
1817 find_confirmed_client_by_str(conf->cl_recdir, hash);
1818 if (old)
1819 expire_client(old);
86c3e16c 1820 move_to_confirmed(conf);
b9831b59 1821 }
ec6b5d7b
AA		 1822out:
1823 nfs4_unlock_state();
1824 dprintk("%s returns %d\n", __func__, ntohl(status));
1825 return status;
069b6ad4
AA		 1826}
1827
57716355
BF		 1828static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1829{
1830 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1831 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1832
1833 return argp->opcnt == resp->opcnt;
1834}
1835
1d1bc8f2
BF		 1836static __be32 nfsd4_map_bcts_dir(u32 *dir)
1837{
1838 switch (*dir) {
1839 case NFS4_CDFC4_FORE:
1840 case NFS4_CDFC4_BACK:
1841 return nfs_ok;
1842 case NFS4_CDFC4_FORE_OR_BOTH:
1843 case NFS4_CDFC4_BACK_OR_BOTH:
1844 *dir = NFS4_CDFC4_BOTH;
1845 return nfs_ok;
1846 };
1847 return nfserr_inval;
1848}
1849
1850__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1851 struct nfsd4_compound_state *cstate,
1852 struct nfsd4_bind_conn_to_session *bcts)
1853{
1854 __be32 status;
1855
1856 if (!nfsd4_last_compound_op(rqstp))
1857 return nfserr_not_only_op;
1858 spin_lock(&client_lock);
1859 cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1860 /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1861 * client_lock iself: */
1862 if (cstate->session) {
1863 nfsd4_get_session(cstate->session);
1864 atomic_inc(&cstate->session->se_client->cl_refcount);
1865 }
1866 spin_unlock(&client_lock);
1867 if (!cstate->session)
1868 return nfserr_badsession;
1869
1870 status = nfsd4_map_bcts_dir(&bcts->dir);
1db2b9dd
BS		 1871 if (!status)
1872 nfsd4_new_conn(rqstp, cstate->session, bcts->dir);
1873 return status;
1d1bc8f2
BF		 1874}
1875
5d4cec2f
BF		 1876static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1877{
1878 if (!session)
1879 return 0;
1880 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1881}
1882
069b6ad4
AA		 1883__be32
1884nfsd4_destroy_session(struct svc_rqst *r,
1885 struct nfsd4_compound_state *cstate,
1886 struct nfsd4_destroy_session *sessionid)
1887{
e10e0cfc 1888 struct nfsd4_session *ses;
57b7b43b 1889 __be32 status = nfserr_badsession;
e10e0cfc
BH		 1890
1891 /* Notes:
1892 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1893 * - Should we return nfserr_back_chan_busy if waiting for
1894 * callbacks on to-be-destroyed session?
1895 * - Do we need to clear any callback info from previous session?
1896 */
1897
5d4cec2f 1898 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
57716355
BF		 1899 if (!nfsd4_last_compound_op(r))
1900 return nfserr_not_only_op;
1901 }
e10e0cfc 1902 dump_sessionid(__func__, &sessionid->sessionid);
9089f1b4 1903 spin_lock(&client_lock);
e10e0cfc
BH		 1904 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1905 if (!ses) {
9089f1b4 1906 spin_unlock(&client_lock);
e10e0cfc
BH		 1907 goto out;
1908 }
1909
1910 unhash_session(ses);
9089f1b4 1911 spin_unlock(&client_lock);
e10e0cfc 1912
ab707e15 1913 nfs4_lock_state();
84f5f7cc 1914 nfsd4_probe_callback_sync(ses->se_client);
ab707e15 1915 nfs4_unlock_state();
19cf5c02 1916
508dc6e1 1917 spin_lock(&client_lock);
19cf5c02 1918 nfsd4_del_conns(ses);
508dc6e1
BH		 1919 nfsd4_put_session_locked(ses);
1920 spin_unlock(&client_lock);
e10e0cfc
BH		 1921 status = nfs_ok;
1922out:
1923 dprintk("%s returns %d\n", __func__, ntohl(status));
1924 return status;
069b6ad4
AA		 1925}
1926
a663bdd8 1927static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
328ead28
BF		 1928{
1929 struct nfsd4_conn *c;
1930
1931 list_for_each_entry(c, &s->se_conns, cn_persession) {
a663bdd8 1932 if (c->cn_xprt == xpt) {
328ead28
BF		 1933 return c;
1934 }
1935 }
1936 return NULL;
1937}
1938
a663bdd8 1939static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
328ead28
BF		 1940{
1941 struct nfs4_client *clp = ses->se_client;
a663bdd8 1942 struct nfsd4_conn *c;
21b75b01 1943 int ret;
328ead28
BF		 1944
1945 spin_lock(&clp->cl_lock);
a663bdd8 1946 c = __nfsd4_find_conn(new->cn_xprt, ses);
328ead28
BF		 1947 if (c) {
1948 spin_unlock(&clp->cl_lock);
1949 free_conn(new);
1950 return;
1951 }
1952 __nfsd4_hash_conn(new, ses);
1953 spin_unlock(&clp->cl_lock);
21b75b01
BF		 1954 ret = nfsd4_register_conn(new);
1955 if (ret)
1956 /* oops; xprt is already down: */
1957 nfsd4_conn_lost(&new->cn_xpt_user);
328ead28
BF		 1958 return;
1959}
1960
868b89c3
MJ		 1961static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
1962{
1963 struct nfsd4_compoundargs *args = rqstp->rq_argp;
1964
1965 return args->opcnt > session->se_fchannel.maxops;
1966}
1967
ae82a8d0
MJ		 1968static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
1969 struct nfsd4_session *session)
1970{
1971 struct xdr_buf *xb = &rqstp->rq_arg;
1972
1973 return xb->len > session->se_fchannel.maxreq_sz;
1974}
1975
069b6ad4 1976__be32
b85d4c01 1977nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1978 struct nfsd4_compound_state *cstate,
1979 struct nfsd4_sequence *seq)
1980{
f9bb94c4 1981 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1982 struct nfsd4_session *session;
1983 struct nfsd4_slot *slot;
a663bdd8 1984 struct nfsd4_conn *conn;
57b7b43b 1985 __be32 status;
b85d4c01 1986
f9bb94c4
AA		 1987 if (resp->opcnt != 1)
1988 return nfserr_sequence_pos;
1989
a663bdd8
BF		 1990 /*
1991 * Will be either used or freed by nfsd4_sequence_check_conn
1992 * below.
1993 */
1994 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1995 if (!conn)
1996 return nfserr_jukebox;
1997
9089f1b4 1998 spin_lock(&client_lock);
b85d4c01
BH		 1999 status = nfserr_badsession;
2000 session = find_in_sessionid_hashtbl(&seq->sessionid);
2001 if (!session)
2002 goto out;
2003
868b89c3
MJ		 2004 status = nfserr_too_many_ops;
2005 if (nfsd4_session_too_many_ops(rqstp, session))
2006 goto out;
2007
ae82a8d0
MJ		 2008 status = nfserr_req_too_big;
2009 if (nfsd4_request_too_big(rqstp, session))
2010 goto out;
2011
b85d4c01 2012 status = nfserr_badslot;
6c18ba9f 2013 if (seq->slotid >= session->se_fchannel.maxreqs)
b85d4c01
BH		 2014 goto out;
2015
557ce264 2016 slot = session->se_slots[seq->slotid];
b85d4c01
BH		 2017 dprintk("%s: slotid %d\n", __func__, seq->slotid);
2018
a8dfdaeb
AA		 2019 /* We do not negotiate the number of slots yet, so set the
2020 * maxslots to the session maxreqs which is used to encode
2021 * sr_highest_slotid and the sr_target_slot id to maxslots */
2022 seq->maxslots = session->se_fchannel.maxreqs;
2023
73e79482
BF		 2024 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2025 slot->sl_flags & NFSD4_SLOT_INUSE);
b85d4c01 2026 if (status == nfserr_replay_cache) {
bf5c43c8
BF		 2027 status = nfserr_seq_misordered;
2028 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2029 goto out;
b85d4c01
BH		 2030 cstate->slot = slot;
2031 cstate->session = session;
da3846a2 2032 /* Return the cached reply status and set cstate->status
557ce264 2033 * for nfsd4_proc_compound processing */
bf864a31 2034 status = nfsd4_replay_cache_entry(resp, seq);
da3846a2 2035 cstate->status = nfserr_replay_cache;
aaf84eb9 2036 goto out;
b85d4c01
BH		 2037 }
2038 if (status)
2039 goto out;
2040
a663bdd8
BF		 2041 nfsd4_sequence_check_conn(conn, session);
2042 conn = NULL;
328ead28 2043
b85d4c01 2044 /* Success! bump slot seqid */
b85d4c01 2045 slot->sl_seqid = seq->seqid;
bf5c43c8 2046 slot->sl_flags |= NFSD4_SLOT_INUSE;
73e79482
BF		 2047 if (seq->cachethis)
2048 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
bf5c43c8
BF		 2049 else
2050 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
b85d4c01
BH		 2051
2052 cstate->slot = slot;
2053 cstate->session = session;
2054
b85d4c01 2055out:
26c0c75e 2056 /* Hold a session reference until done processing the compound. */
aaf84eb9 2057 if (cstate->session) {
0d7bb719
BF		 2058 struct nfs4_client *clp = session->se_client;
2059
36acb66b 2060 nfsd4_get_session(cstate->session);
0d7bb719 2061 atomic_inc(&clp->cl_refcount);
5423732a
BH		 2062 switch (clp->cl_cb_state) {
2063 case NFSD4_CB_DOWN:
fc0c3dd1 2064 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
5423732a
BH		 2065 break;
2066 case NFSD4_CB_FAULT:
fc0c3dd1 2067 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
5423732a 2068 break;
fc0c3dd1
BH		 2069 default:
2070 seq->status_flags = 0;
5423732a 2071 }
aaf84eb9 2072 }
a663bdd8 2073 kfree(conn);
36acb66b 2074 spin_unlock(&client_lock);
b85d4c01
BH		 2075 dprintk("%s: return %d\n", __func__, ntohl(status));
2076 return status;
069b6ad4
AA		 2077}
2078
345c2842
MJ		 2079__be32
2080nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2081{
2082 struct nfs4_client *conf, *unconf, *clp;
57b7b43b 2083 __be32 status = 0;
345c2842
MJ		 2084
2085 nfs4_lock_state();
2086 unconf = find_unconfirmed_client(&dc->clientid);
2087 conf = find_confirmed_client(&dc->clientid);
2088
2089 if (conf) {
2090 clp = conf;
2091
6eccece9 2092 if (!is_client_expired(conf) && client_has_state(conf)) {
345c2842
MJ		 2093 status = nfserr_clientid_busy;
2094 goto out;
2095 }
2096
2097 /* rfc5661 18.50.3 */
2098 if (cstate->session && conf == cstate->session->se_client) {
2099 status = nfserr_clientid_busy;
2100 goto out;
2101 }
2102 } else if (unconf)
2103 clp = unconf;
2104 else {
2105 status = nfserr_stale_clientid;
2106 goto out;
2107 }
2108
2109 expire_client(clp);
2110out:
2111 nfs4_unlock_state();
2112 dprintk("%s return %d\n", __func__, ntohl(status));
2113 return status;
2114}
2115
4dc6ec00
BF		 2116__be32
2117nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2118{
57b7b43b 2119 __be32 status = 0;
bcecf1cc 2120
4dc6ec00
BF		 2121 if (rc->rca_one_fs) {
2122 if (!cstate->current_fh.fh_dentry)
2123 return nfserr_nofilehandle;
2124 /*
2125 * We don't take advantage of the rca_one_fs case.
2126 * That's OK, it's optional, we can safely ignore it.
2127 */
2128 return nfs_ok;
2129 }
bcecf1cc 2130
4dc6ec00 2131 nfs4_lock_state();
bcecf1cc 2132 status = nfserr_complete_already;
a52d726b
JL		 2133 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2134 &cstate->session->se_client->cl_flags))
bcecf1cc
MJ		 2135 goto out;
2136
2137 status = nfserr_stale_clientid;
2138 if (is_client_expired(cstate->session->se_client))
4dc6ec00
BF		 2139 /*
2140 * The following error isn't really legal.
2141 * But we only get here if the client just explicitly
2142 * destroyed the client. Surely it no longer cares what
2143 * error it gets back on an operation for the dead
2144 * client.
2145 */
bcecf1cc
MJ		 2146 goto out;
2147
2148 status = nfs_ok;
2a4317c5 2149 nfsd4_client_record_create(cstate->session->se_client);
bcecf1cc 2150out:
4dc6ec00 2151 nfs4_unlock_state();
bcecf1cc 2152 return status;
4dc6ec00
BF		 2153}
2154
b37ad28b 2155__be32
b591480b
BF		 2156nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2157 struct nfsd4_setclientid *setclid)
1da177e4 2158{
a084daf5 2159 struct xdr_netobj clname = setclid->se_name;
1da177e4
LT		 2160 nfs4_verifier clverifier = setclid->se_verf;
2161 unsigned int strhashval;
28ce6054 2162 struct nfs4_client *conf, *unconf, *new;
b37ad28b 2163 __be32 status;
a55370a3 2164 char dname[HEXDIR_LEN];
1da177e4 2165
a55370a3
N		 2166 status = nfs4_make_rec_clidname(dname, &clname);
2167 if (status)
73aea4ec 2168 return status;
a55370a3 2169
a55370a3 2170 strhashval = clientstr_hashval(dname);
1da177e4 2171
63db4632 2172 /* Cases below refer to rfc 3530 section 14.2.33: */
1da177e4 2173 nfs4_lock_state();
e203d506 2174 conf = find_confirmed_client_by_str(dname, strhashval);
28ce6054 2175 if (conf) {
63db4632 2176 /* case 0: */
1da177e4 2177 status = nfserr_clid_inuse;
e203d506
BF		 2178 if (clp_used_exchangeid(conf))
2179 goto out;
026722c2 2180 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
363168b4
JL		 2181 char addr_str[INET6_ADDRSTRLEN];
2182 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2183 sizeof(addr_str));
2184 dprintk("NFSD: setclientid: string in use by client "
2185 "at %s\n", addr_str);
1da177e4
LT		 2186 goto out;
2187 }
1da177e4 2188 }
e203d506 2189 unconf = find_unconfirmed_client_by_str(dname, strhashval);
8f930711
BF		 2190 if (unconf)
2191 expire_client(unconf);
3e772463 2192 status = nfserr_jukebox;
8f930711
BF		 2193 new = create_client(clname, dname, rqstp, &clverifier);
2194 if (new == NULL)
2195 goto out;
34b232bb 2196 if (conf && same_verf(&conf->cl_verifier, &clverifier))
63db4632 2197 /* case 1: probable callback update */
1da177e4 2198 copy_clid(new, conf);
34b232bb 2199 else /* case 4 (new client) or cases 2, 3 (client reboot): */
1da177e4 2200 gen_clid(new);
8323c3b2
BF		 2201 /*
2202 * XXX: we should probably set this at creation time, and check
2203 * for consistent minorversion use throughout:
2204 */
2205 new->cl_minorversion = 0;
6f3d772f 2206 gen_callback(new, setclid, rqstp);
c175b83c 2207 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 2208 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2209 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2210 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2211 status = nfs_ok;
2212out:
2213 nfs4_unlock_state();
2214 return status;
2215}
2216
2217
b37ad28b 2218__be32
b591480b
BF		 2219nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2220 struct nfsd4_compound_state *cstate,
2221 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 2222{
21ab45a4 2223 struct nfs4_client *conf, *unconf;
1da177e4
LT		 2224 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2225 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 2226 __be32 status;
1da177e4
LT		 2227
2228 if (STALE_CLIENTID(clid))
2229 return nfserr_stale_clientid;
1da177e4 2230 nfs4_lock_state();
21ab45a4
N		 2231
2232 conf = find_confirmed_client(clid);
2233 unconf = find_unconfirmed_client(clid);
a186e767 2234 /*
8695b90a
BF		 2235 * We try hard to give out unique clientid's, so if we get an
2236 * attempt to confirm the same clientid with a different cred,
2237 * there's a bug somewhere. Let's charitably assume it's our
2238 * bug.
a186e767 2239 */
8695b90a
BF		 2240 status = nfserr_serverfault;
2241 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2242 goto out;
2243 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2244 goto out;
63db4632 2245 /* cases below refer to rfc 3530 section 14.2.34: */
90d700b7
BF		 2246 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2247 if (conf && !unconf) /* case 2: probable retransmit */
1da177e4 2248 status = nfs_ok;
90d700b7
BF		 2249 else /* case 4: client hasn't noticed we rebooted yet? */
2250 status = nfserr_stale_clientid;
2251 goto out;
2252 }
2253 status = nfs_ok;
2254 if (conf) { /* case 1: callback update */
8695b90a
BF		 2255 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2256 nfsd4_probe_callback(conf);
2257 expire_client(unconf);
90d700b7 2258 } else { /* case 3: normal case; new or rebooted client */
8695b90a 2259 unsigned int hash = clientstr_hashval(unconf->cl_recdir);
1a69c179 2260
8695b90a
BF		 2261 conf = find_confirmed_client_by_str(unconf->cl_recdir, hash);
2262 if (conf) {
2263 nfsd4_client_record_remove(conf);
2264 expire_client(conf);
1da177e4 2265 }
8695b90a 2266 move_to_confirmed(unconf);
f3d03b92 2267 nfsd4_probe_callback(unconf);
08e8987c 2268 }
1da177e4 2269out:
1da177e4
LT		 2270 nfs4_unlock_state();
2271 return status;
2272}
2273
32513b40
BF		 2274static struct nfs4_file *nfsd4_alloc_file(void)
2275{
2276 return kmem_cache_alloc(file_slab, GFP_KERNEL);
2277}
2278
1da177e4 2279/* OPEN Share state helper functions */
32513b40 2280static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
1da177e4 2281{
1da177e4
LT		 2282 unsigned int hashval = file_hashval(ino);
2283
32513b40
BF		 2284 atomic_set(&fp->fi_ref, 1);
2285 INIT_LIST_HEAD(&fp->fi_hash);
2286 INIT_LIST_HEAD(&fp->fi_stateids);
2287 INIT_LIST_HEAD(&fp->fi_delegations);
2288 fp->fi_inode = igrab(ino);
2289 fp->fi_had_conflict = false;
2290 fp->fi_lease = NULL;
2291 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2292 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2293 spin_lock(&recall_lock);
2294 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2295 spin_unlock(&recall_lock);
1da177e4
LT		 2296}
2297
e60d4398 2298static void
e18b890b 2299nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 2300{
e60d4398
N		 2301 if (*slab == NULL)
2302 return;
1a1d92c1 2303 kmem_cache_destroy(*slab);
e60d4398 2304 *slab = NULL;
1da177e4
LT		 2305}
2306
e8ff2a84 2307void
1da177e4
LT		 2308nfsd4_free_slabs(void)
2309{
fe0750e5
BF		 2310 nfsd4_free_slab(&openowner_slab);
2311 nfsd4_free_slab(&lockowner_slab);
e60d4398 2312 nfsd4_free_slab(&file_slab);
5ac049ac 2313 nfsd4_free_slab(&stateid_slab);
5b2d21c1 2314 nfsd4_free_slab(&deleg_slab);
e60d4398 2315}
1da177e4 2316
72083396 2317int
e60d4398
N		 2318nfsd4_init_slabs(void)
2319{
fe0750e5
BF		 2320 openowner_slab = kmem_cache_create("nfsd4_openowners",
2321 sizeof(struct nfs4_openowner), 0, 0, NULL);
2322 if (openowner_slab == NULL)
2323 goto out_nomem;
2324 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2325 sizeof(struct nfs4_openowner), 0, 0, NULL);
2326 if (lockowner_slab == NULL)
e60d4398
N		 2327 goto out_nomem;
2328 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 2329 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 2330 if (file_slab == NULL)
2331 goto out_nomem;
5ac049ac 2332 stateid_slab = kmem_cache_create("nfsd4_stateids",
dcef0413 2333 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
5ac049ac
N		 2334 if (stateid_slab == NULL)
2335 goto out_nomem;
5b2d21c1 2336 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 2337 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 2338 if (deleg_slab == NULL)
2339 goto out_nomem;
e60d4398
N		 2340 return 0;
2341out_nomem:
2342 nfsd4_free_slabs();
2343 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2344 return -ENOMEM;
1da177e4
LT		 2345}
2346
fe0750e5
BF		 2347void nfs4_free_openowner(struct nfs4_openowner *oo)
2348{
2349 kfree(oo->oo_owner.so_owner.data);
2350 kmem_cache_free(openowner_slab, oo);
2351}
2352
2353void nfs4_free_lockowner(struct nfs4_lockowner *lo)
1da177e4 2354{
fe0750e5
BF		 2355 kfree(lo->lo_owner.so_owner.data);
2356 kmem_cache_free(lockowner_slab, lo);
1da177e4
LT		 2357}
2358
ff194bd9 2359static void init_nfs4_replay(struct nfs4_replay *rp)
1da177e4 2360{
ff194bd9
BF		 2361 rp->rp_status = nfserr_serverfault;
2362 rp->rp_buflen = 0;
2363 rp->rp_buf = rp->rp_ibuf;
1da177e4
LT		 2364}
2365
fe0750e5 2366static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
ff194bd9 2367{
1da177e4 2368 struct nfs4_stateowner *sop;
1da177e4 2369
fe0750e5 2370 sop = kmem_cache_alloc(slab, GFP_KERNEL);
ff194bd9
BF		 2371 if (!sop)
2372 return NULL;
2373
2374 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2375 if (!sop->so_owner.data) {
fe0750e5 2376 kmem_cache_free(slab, sop);
1da177e4 2377 return NULL;
ff194bd9
BF		 2378 }
2379 sop->so_owner.len = owner->len;
2380
ea1da636 2381 INIT_LIST_HEAD(&sop->so_stateids);
ff194bd9
BF		 2382 sop->so_client = clp;
2383 init_nfs4_replay(&sop->so_replay);
2384 return sop;
2385}
2386
fe0750e5 2387static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
ff194bd9 2388{
16bfdaaf 2389 list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
fe0750e5 2390 list_add(&oo->oo_perclient, &clp->cl_openowners);
ff194bd9
BF		 2391}
2392
fe0750e5 2393static struct nfs4_openowner *
ff194bd9 2394alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
fe0750e5 2395 struct nfs4_openowner *oo;
ff194bd9 2396
fe0750e5
BF		 2397 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2398 if (!oo)
ff194bd9 2399 return NULL;
fe0750e5
BF		 2400 oo->oo_owner.so_is_open_owner = 1;
2401 oo->oo_owner.so_seqid = open->op_seqid;
d29b20cd 2402 oo->oo_flags = NFS4_OO_NEW;
fe0750e5 2403 oo->oo_time = 0;
38c387b5 2404 oo->oo_last_closed_stid = NULL;
fe0750e5
BF		 2405 INIT_LIST_HEAD(&oo->oo_close_lru);
2406 hash_openowner(oo, clp, strhashval);
2407 return oo;
1da177e4
LT		 2408}
2409
996e0938 2410static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
fe0750e5 2411 struct nfs4_openowner *oo = open->op_openowner;
d3b313a4 2412 struct nfs4_client *clp = oo->oo_owner.so_client;
1da177e4 2413
996e0938 2414 init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
ea1da636 2415 INIT_LIST_HEAD(&stp->st_lockowners);
fe0750e5 2416 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
8beefa24 2417 list_add(&stp->st_perfile, &fp->fi_stateids);
fe0750e5 2418 stp->st_stateowner = &oo->oo_owner;
13cd2184 2419 get_nfs4_file(fp);
1da177e4 2420 stp->st_file = fp;
1da177e4
LT		 2421 stp->st_access_bmap = 0;
2422 stp->st_deny_bmap = 0;
82c5ff1b 2423 set_access(open->op_share_access, stp);
ce0fc43c 2424 set_deny(open->op_share_deny, stp);
4c4cd222 2425 stp->st_openstp = NULL;
1da177e4
LT		 2426}
2427
fd39ca9a 2428static void
fe0750e5 2429move_to_close_lru(struct nfs4_openowner *oo)
1da177e4 2430{
fe0750e5 2431 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
1da177e4 2432
fe0750e5
BF		 2433 list_move_tail(&oo->oo_close_lru, &close_lru);
2434 oo->oo_time = get_seconds();
1da177e4
LT		 2435}
2436
1da177e4 2437static int
599e0a22
BF		 2438same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2439 clientid_t *clid)
2440{
2441 return (sop->so_owner.len == owner->len) &&
2442 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2443 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 2444}
2445
fe0750e5 2446static struct nfs4_openowner *
1da177e4
LT		 2447find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2448{
a50d2ad1
BF		 2449 struct nfs4_stateowner *so;
2450 struct nfs4_openowner *oo;
1da177e4 2451
16bfdaaf
BF		 2452 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2453 if (!so->so_is_open_owner)
2454 continue;
a50d2ad1
BF		 2455 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2456 oo = openowner(so);
2457 renew_client(oo->oo_owner.so_client);
2458 return oo;
2459 }
1da177e4
LT		 2460 }
2461 return NULL;
2462}
2463
2464/* search file_hashtbl[] for file */
2465static struct nfs4_file *
2466find_file(struct inode *ino)
2467{
2468 unsigned int hashval = file_hashval(ino);
2469 struct nfs4_file *fp;
2470
8b671b80 2471 spin_lock(&recall_lock);
1da177e4 2472 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 2473 if (fp->fi_inode == ino) {
2474 get_nfs4_file(fp);
8b671b80 2475 spin_unlock(&recall_lock);
1da177e4 2476 return fp;
13cd2184 2477 }
1da177e4 2478 }
8b671b80 2479 spin_unlock(&recall_lock);
1da177e4
LT		 2480 return NULL;
2481}
2482
1da177e4
LT		 2483/*
2484 * Called to check deny when READ with all zero stateid or
2485 * WRITE with all zero or all one stateid
2486 */
b37ad28b 2487static __be32
1da177e4
LT		 2488nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2489{
2490 struct inode *ino = current_fh->fh_dentry->d_inode;
2491 struct nfs4_file *fp;
dcef0413 2492 struct nfs4_ol_stateid *stp;
b37ad28b 2493 __be32 ret;
1da177e4
LT		 2494
2495 dprintk("NFSD: nfs4_share_conflict\n");
2496
2497 fp = find_file(ino);
13cd2184
N		 2498 if (!fp)
2499 return nfs_ok;
b700949b 2500 ret = nfserr_locked;
1da177e4 2501 /* Search for conflicting share reservations */
13cd2184 2502 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
ce0fc43c
JL		 2503 if (test_deny(deny_type, stp) ||
2504 test_deny(NFS4_SHARE_DENY_BOTH, stp))
13cd2184 2505 goto out;
1da177e4 2506 }
13cd2184
N		 2507 ret = nfs_ok;
2508out:
2509 put_nfs4_file(fp);
2510 return ret;
1da177e4
LT		 2511}
2512
6b57d9c8 2513static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
1da177e4 2514{
1da177e4
LT		 2515 /* We're assuming the state code never drops its reference
2516 * without first removing the lease. Since we're in this lease
2517 * callback (and since the lease code is serialized by the kernel
2518 * lock) we know the server hasn't removed the lease yet, we know
2519 * it's safe to take a reference: */
2520 atomic_inc(&dp->dl_count);
2521
1da177e4 2522 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1da177e4 2523
460781b5 2524 /* only place dl_time is set. protected by lock_flocks*/
1da177e4
LT		 2525 dp->dl_time = get_seconds();
2526
6b57d9c8
BF		 2527 nfsd4_cb_recall(dp);
2528}
2529
acfdf5c3 2530/* Called from break_lease() with lock_flocks() held. */
6b57d9c8
BF		 2531static void nfsd_break_deleg_cb(struct file_lock *fl)
2532{
acfdf5c3
BF		 2533 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2534 struct nfs4_delegation *dp;
6b57d9c8 2535
acfdf5c3
BF		 2536 BUG_ON(!fp);
2537 /* We assume break_lease is only called once per lease: */
2538 BUG_ON(fp->fi_had_conflict);
0272e1fd
BF		 2539 /*
2540 * We don't want the locks code to timeout the lease for us;
acfdf5c3 2541 * we'll remove it ourself if a delegation isn't returned
6b57d9c8 2542 * in time:
0272e1fd
BF		 2543 */
2544 fl->fl_break_time = 0;
1da177e4 2545
5d926e8c 2546 spin_lock(&recall_lock);
acfdf5c3
BF		 2547 fp->fi_had_conflict = true;
2548 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2549 nfsd_break_one_deleg(dp);
5d926e8c 2550 spin_unlock(&recall_lock);
1da177e4
LT		 2551}
2552
1da177e4
LT		 2553static
2554int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2555{
2556 if (arg & F_UNLCK)
2557 return lease_modify(onlist, arg);
2558 else
2559 return -EAGAIN;
2560}
2561
7b021967 2562static const struct lock_manager_operations nfsd_lease_mng_ops = {
8fb47a4f
BF		 2563 .lm_break = nfsd_break_deleg_cb,
2564 .lm_change = nfsd_change_deleg_cb,
1da177e4
LT		 2565};
2566
7a8711c9
BF		 2567static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2568{
2569 if (nfsd4_has_session(cstate))
2570 return nfs_ok;
2571 if (seqid == so->so_seqid - 1)
2572 return nfserr_replay_me;
2573 if (seqid == so->so_seqid)
2574 return nfs_ok;
2575 return nfserr_bad_seqid;
2576}
1da177e4 2577
b37ad28b 2578__be32
6668958f
AA		 2579nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2580 struct nfsd4_open *open)
1da177e4 2581{
1da177e4
LT		 2582 clientid_t *clientid = &open->op_clientid;
2583 struct nfs4_client *clp = NULL;
2584 unsigned int strhashval;
fe0750e5 2585 struct nfs4_openowner *oo = NULL;
4cdc951b 2586 __be32 status;
1da177e4 2587
1da177e4
LT		 2588 if (STALE_CLIENTID(&open->op_clientid))
2589 return nfserr_stale_clientid;
32513b40
BF		 2590 /*
2591 * In case we need it later, after we've already created the
2592 * file and don't want to risk a further failure:
2593 */
2594 open->op_file = nfsd4_alloc_file();
2595 if (open->op_file == NULL)
2596 return nfserr_jukebox;
1da177e4 2597
16bfdaaf 2598 strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
fe0750e5
BF		 2599 oo = find_openstateowner_str(strhashval, open);
2600 open->op_openowner = oo;
2601 if (!oo) {
1da177e4
LT		 2602 clp = find_confirmed_client(clientid);
2603 if (clp == NULL)
0f442aa2 2604 return nfserr_expired;
bcf130f9 2605 goto new_owner;
1da177e4 2606 }
dad1c067 2607 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
0f442aa2 2608 /* Replace unconfirmed owners without checking for replay. */
fe0750e5
BF		 2609 clp = oo->oo_owner.so_client;
2610 release_openowner(oo);
2611 open->op_openowner = NULL;
bcf130f9 2612 goto new_owner;
0f442aa2 2613 }
4cdc951b
BF		 2614 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2615 if (status)
2616 return status;
2617 clp = oo->oo_owner.so_client;
2618 goto alloc_stateid;
bcf130f9
BF		 2619new_owner:
2620 oo = alloc_init_open_stateowner(strhashval, clp, open);
2621 if (oo == NULL)
2622 return nfserr_jukebox;
2623 open->op_openowner = oo;
4cdc951b
BF		 2624alloc_stateid:
2625 open->op_stp = nfs4_alloc_stateid(clp);
2626 if (!open->op_stp)
2627 return nfserr_jukebox;
0f442aa2 2628 return nfs_ok;
1da177e4
LT		 2629}
2630
b37ad28b 2631static inline __be32
4a6e43e6
N		 2632nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2633{
2634 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2635 return nfserr_openmode;
2636 else
2637 return nfs_ok;
2638}
2639
f459e453 2640static int share_access_to_flags(u32 share_access)
52f4fb43 2641{
f459e453 2642 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
52f4fb43
N		 2643}
2644
38c2f4b1 2645static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
24a0111e 2646{
f459e453 2647 struct nfs4_stid *ret;
24a0111e 2648
38c2f4b1 2649 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
f459e453
BF		 2650 if (!ret)
2651 return NULL;
2652 return delegstateid(ret);
24a0111e
BF		 2653}
2654
8b289b2c
BF		 2655static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2656{
2657 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2658 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2659}
2660
b37ad28b 2661static __be32
38c2f4b1 2662nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
567d9829
N		 2663 struct nfs4_delegation **dp)
2664{
2665 int flags;
b37ad28b 2666 __be32 status = nfserr_bad_stateid;
567d9829 2667
38c2f4b1 2668 *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
567d9829 2669 if (*dp == NULL)
c44c5eeb 2670 goto out;
24a0111e 2671 flags = share_access_to_flags(open->op_share_access);
567d9829
N		 2672 status = nfs4_check_delegmode(*dp, flags);
2673 if (status)
2674 *dp = NULL;
c44c5eeb 2675out:
8b289b2c 2676 if (!nfsd4_is_deleg_cur(open))
c44c5eeb
N		 2677 return nfs_ok;
2678 if (status)
2679 return status;
dad1c067 2680 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
c44c5eeb 2681 return nfs_ok;
567d9829
N		 2682}
2683
b37ad28b 2684static __be32
dcef0413 2685nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
1da177e4 2686{
dcef0413 2687 struct nfs4_ol_stateid *local;
fe0750e5 2688 struct nfs4_openowner *oo = open->op_openowner;
1da177e4 2689
8beefa24 2690 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 2691 /* ignore lock owners */
2692 if (local->st_stateowner->so_is_open_owner == 0)
2693 continue;
2694 /* remember if we have seen this open owner */
fe0750e5 2695 if (local->st_stateowner == &oo->oo_owner)
1da177e4
LT		 2696 *stpp = local;
2697 /* check for conflicting share reservations */
2698 if (!test_share(local, open))
77eaae8d 2699 return nfserr_share_denied;
1da177e4 2700 }
77eaae8d 2701 return nfs_ok;
1da177e4
LT		 2702}
2703
996e0938
BF		 2704static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
2705{
2706 kmem_cache_free(stateid_slab, s);
5ac049ac
N		 2707}
2708
21fb4016
BF		 2709static inline int nfs4_access_to_access(u32 nfs4_access)
2710{
2711 int flags = 0;
2712
2713 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2714 flags |= NFSD_MAY_READ;
2715 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2716 flags |= NFSD_MAY_WRITE;
2717 return flags;
2718}
2719
0c12eaff
CB		 2720static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2721 struct svc_fh *cur_fh, struct nfsd4_open *open)
f9d7562f
BF		 2722{
2723 __be32 status;
0c12eaff
CB		 2724 int oflag = nfs4_access_to_omode(open->op_share_access);
2725 int access = nfs4_access_to_access(open->op_share_access);
2726
f9d7562f
BF		 2727 if (!fp->fi_fds[oflag]) {
2728 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2729 &fp->fi_fds[oflag]);
f9d7562f
BF		 2730 if (status)
2731 return status;
2732 }
2733 nfs4_file_get_access(fp, oflag);
2734
2735 return nfs_ok;
2736}
2737
b37ad28b 2738static inline __be32
1da177e4
LT		 2739nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2740 struct nfsd4_open *open)
2741{
2742 struct iattr iattr = {
2743 .ia_valid = ATTR_SIZE,
2744 .ia_size = 0,
2745 };
2746 if (!open->op_truncate)
2747 return 0;
2748 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 2749 return nfserr_inval;
1da177e4
LT		 2750 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2751}
2752
b37ad28b 2753static __be32
dcef0413 2754nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
1da177e4 2755{
b6d2f1ca 2756 u32 op_share_access = open->op_share_access;
7d947842 2757 bool new_access;
b37ad28b 2758 __be32 status;
1da177e4 2759
82c5ff1b 2760 new_access = !test_access(op_share_access, stp);
f9d7562f 2761 if (new_access) {
0c12eaff 2762 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
f9d7562f
BF		 2763 if (status)
2764 return status;
6c26d08f 2765 }
1da177e4
LT		 2766 status = nfsd4_truncate(rqstp, cur_fh, open);
2767 if (status) {
f9d7562f 2768 if (new_access) {
f197c271 2769 int oflag = nfs4_access_to_omode(op_share_access);
f9d7562f
BF		 2770 nfs4_file_put_access(fp, oflag);
2771 }
1da177e4
LT		 2772 return status;
2773 }
2774 /* remember the open */
82c5ff1b 2775 set_access(op_share_access, stp);
ce0fc43c 2776 set_deny(open->op_share_deny, stp);
1da177e4
LT		 2777
2778 return nfs_ok;
2779}
2780
2781
1da177e4 2782static void
1255a8f3 2783nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
1da177e4 2784{
dad1c067 2785 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
1da177e4
LT		 2786}
2787
14a24e99
BF		 2788/* Should we give out recallable state?: */
2789static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2790{
2791 if (clp->cl_cb_state == NFSD4_CB_UP)
2792 return true;
2793 /*
2794 * In the sessions case, since we don't have to establish a
2795 * separate connection for callbacks, we assume it's OK
2796 * until we hear otherwise:
2797 */
2798 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2799}
2800
22d38c4c
BF		 2801static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2802{
2803 struct file_lock *fl;
2804
2805 fl = locks_alloc_lock();
2806 if (!fl)
2807 return NULL;
2808 locks_init_lock(fl);
2809 fl->fl_lmops = &nfsd_lease_mng_ops;
2810 fl->fl_flags = FL_LEASE;
2811 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2812 fl->fl_end = OFFSET_MAX;
acfdf5c3 2813 fl->fl_owner = (fl_owner_t)(dp->dl_file);
22d38c4c 2814 fl->fl_pid = current->tgid;
22d38c4c
BF		 2815 return fl;
2816}
2817
edab9782
BF		 2818static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2819{
acfdf5c3 2820 struct nfs4_file *fp = dp->dl_file;
edab9782
BF		 2821 struct file_lock *fl;
2822 int status;
2823
2824 fl = nfs4_alloc_init_lease(dp, flag);
2825 if (!fl)
2826 return -ENOMEM;
acfdf5c3 2827 fl->fl_file = find_readable_file(fp);
2a74aba7 2828 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
acfdf5c3 2829 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
edab9782 2830 if (status) {
acfdf5c3 2831 list_del_init(&dp->dl_perclnt);
edab9782
BF		 2832 locks_free_lock(fl);
2833 return -ENOMEM;
2834 }
acfdf5c3
BF		 2835 fp->fi_lease = fl;
2836 fp->fi_deleg_file = fl->fl_file;
2837 get_file(fp->fi_deleg_file);
2838 atomic_set(&fp->fi_delegees, 1);
2839 list_add(&dp->dl_perfile, &fp->fi_delegations);
2840 return 0;
2841}
2842
2843static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2844{
2845 struct nfs4_file *fp = dp->dl_file;
2846
2847 if (!fp->fi_lease)
2848 return nfs4_setlease(dp, flag);
2849 spin_lock(&recall_lock);
2850 if (fp->fi_had_conflict) {
2851 spin_unlock(&recall_lock);
2852 return -EAGAIN;
2853 }
2854 atomic_inc(&fp->fi_delegees);
2855 list_add(&dp->dl_perfile, &fp->fi_delegations);
2856 spin_unlock(&recall_lock);
2a74aba7 2857 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
edab9782
BF		 2858 return 0;
2859}
2860
4aa8913c
BH		 2861static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2862{
2863 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2864 if (status == -EAGAIN)
2865 open->op_why_no_deleg = WND4_CONTENTION;
2866 else {
2867 open->op_why_no_deleg = WND4_RESOURCE;
2868 switch (open->op_deleg_want) {
2869 case NFS4_SHARE_WANT_READ_DELEG:
2870 case NFS4_SHARE_WANT_WRITE_DELEG:
2871 case NFS4_SHARE_WANT_ANY_DELEG:
2872 break;
2873 case NFS4_SHARE_WANT_CANCEL:
2874 open->op_why_no_deleg = WND4_CANCELLED;
2875 break;
2876 case NFS4_SHARE_WANT_NO_DELEG:
2877 BUG(); /* not supposed to get here */
2878 }
2879 }
2880}
2881
1da177e4
LT		 2882/*
2883 * Attempt to hand out a delegation.
2884 */
2885static void
dcef0413 2886nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
1da177e4
LT		 2887{
2888 struct nfs4_delegation *dp;
fe0750e5 2889 struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
14a24e99 2890 int cb_up;
d24433cd 2891 int status = 0, flag = 0;
1da177e4 2892
fe0750e5 2893 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
1da177e4 2894 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 2895 open->op_recall = 0;
2896 switch (open->op_claim_type) {
2897 case NFS4_OPEN_CLAIM_PREVIOUS:
2bf23875 2898 if (!cb_up)
7b190fec
N		 2899 open->op_recall = 1;
2900 flag = open->op_delegate_type;
2901 if (flag == NFS4_OPEN_DELEGATE_NONE)
2902 goto out;
2903 break;
2904 case NFS4_OPEN_CLAIM_NULL:
2905 /* Let's not give out any delegations till everyone's
2906 * had the chance to reclaim theirs.... */
af558e33 2907 if (locks_in_grace())
7b190fec 2908 goto out;
dad1c067 2909 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
7b190fec
N		 2910 goto out;
2911 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2912 flag = NFS4_OPEN_DELEGATE_WRITE;
2913 else
2914 flag = NFS4_OPEN_DELEGATE_READ;
2915 break;
2916 default:
2917 goto out;
2918 }
1da177e4 2919
fe0750e5 2920 dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
dd239cc0
BF		 2921 if (dp == NULL)
2922 goto out_no_deleg;
acfdf5c3 2923 status = nfs4_set_delegation(dp, flag);
edab9782 2924 if (status)
dd239cc0 2925 goto out_free;
1da177e4 2926
d5477a8d 2927 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
1da177e4 2928
8c10cbdb 2929 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
d5477a8d 2930 STATEID_VAL(&dp->dl_stid.sc_stateid));
1da177e4
LT		 2931out:
2932 open->op_delegate_type = flag;
d24433cd
BH		 2933 if (flag == NFS4_OPEN_DELEGATE_NONE) {
2934 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2935 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2936 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2937
4aa8913c
BH		 2938 /* 4.1 client asking for a delegation? */
2939 if (open->op_deleg_want)
2940 nfsd4_open_deleg_none_ext(open, status);
d24433cd 2941 }
dd239cc0
BF		 2942 return;
2943out_free:
acfdf5c3 2944 nfs4_put_delegation(dp);
dd239cc0
BF		 2945out_no_deleg:
2946 flag = NFS4_OPEN_DELEGATE_NONE;
2947 goto out;
1da177e4
LT		 2948}
2949
e27f49c3
BH		 2950static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
2951 struct nfs4_delegation *dp)
2952{
2953 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
2954 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2955 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2956 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
2957 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
2958 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2959 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2960 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
2961 }
2962 /* Otherwise the client must be confused wanting a delegation
2963 * it already has, therefore we don't return
2964 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
2965 */
2966}
2967
1da177e4
LT		 2968/*
2969 * called with nfs4_lock_state() held.
2970 */
b37ad28b 2971__be32
1da177e4
LT		 2972nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2973{
6668958f 2974 struct nfsd4_compoundres *resp = rqstp->rq_resp;
38c2f4b1 2975 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
1da177e4
LT		 2976 struct nfs4_file *fp = NULL;
2977 struct inode *ino = current_fh->fh_dentry->d_inode;
dcef0413 2978 struct nfs4_ol_stateid *stp = NULL;
567d9829 2979 struct nfs4_delegation *dp = NULL;
b37ad28b 2980 __be32 status;
1da177e4 2981
1da177e4
LT		 2982 /*
2983 * Lookup file; if found, lookup stateid and check open request,
2984 * and check for delegations in the process of being recalled.
2985 * If not found, create the nfs4_file struct
2986 */
2987 fp = find_file(ino);
2988 if (fp) {
2989 if ((status = nfs4_check_open(fp, open, &stp)))
2990 goto out;
38c2f4b1 2991 status = nfs4_check_deleg(cl, fp, open, &dp);
c44c5eeb
N		 2992 if (status)
2993 goto out;
1da177e4 2994 } else {
c44c5eeb 2995 status = nfserr_bad_stateid;
8b289b2c 2996 if (nfsd4_is_deleg_cur(open))
c44c5eeb 2997 goto out;
3e772463 2998 status = nfserr_jukebox;
32513b40
BF		 2999 fp = open->op_file;
3000 open->op_file = NULL;
3001 nfsd4_init_file(fp, ino);
1da177e4
LT		 3002 }
3003
3004 /*
3005 * OPEN the file, or upgrade an existing OPEN.
3006 * If truncate fails, the OPEN fails.
3007 */
3008 if (stp) {
3009 /* Stateid was found, this is an OPEN upgrade */
f9d7562f 3010 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
1da177e4
LT		 3011 if (status)
3012 goto out;
3013 } else {
4cdc951b 3014 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
4af82504
BF		 3015 if (status)
3016 goto out;
3017 status = nfsd4_truncate(rqstp, current_fh, open);
567d9829 3018 if (status)
1da177e4 3019 goto out;
4cdc951b
BF		 3020 stp = open->op_stp;
3021 open->op_stp = NULL;
996e0938 3022 init_open_stateid(stp, fp, open);
1da177e4 3023 }
dcef0413
BF		 3024 update_stateid(&stp->st_stid.sc_stateid);
3025 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
1da177e4 3026
d24433cd 3027 if (nfsd4_has_session(&resp->cstate)) {
dad1c067 3028 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
6668958f 3029
d24433cd
BH		 3030 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3031 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3032 open->op_why_no_deleg = WND4_NOT_WANTED;
3033 goto nodeleg;
3034 }
3035 }
3036
1da177e4
LT		 3037 /*
3038 * Attempt to hand out a delegation. No error return, because the
3039 * OPEN succeeds even if we fail.
3040 */
3041 nfs4_open_delegation(current_fh, open, stp);
d24433cd 3042nodeleg:
1da177e4
LT		 3043 status = nfs_ok;
3044
8c10cbdb 3045 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
dcef0413 3046 STATEID_VAL(&stp->st_stid.sc_stateid));
1da177e4 3047out:
d24433cd
BH		 3048 /* 4.1 client trying to upgrade/downgrade delegation? */
3049 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
e27f49c3
BH		 3050 open->op_deleg_want)
3051 nfsd4_deleg_xgrade_none_ext(open, dp);
d24433cd 3052
13cd2184
N		 3053 if (fp)
3054 put_nfs4_file(fp);
37515177 3055 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1255a8f3 3056 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
1da177e4
LT		 3057 /*
3058 * To finish the open response, we just need to set the rflags.
3059 */
3060 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
dad1c067 3061 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
6668958f 3062 !nfsd4_has_session(&resp->cstate))
1da177e4
LT		 3063 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3064
3065 return status;
3066}
3067
d29b20cd
BF		 3068void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3069{
3070 if (open->op_openowner) {
3071 struct nfs4_openowner *oo = open->op_openowner;
3072
3073 if (!list_empty(&oo->oo_owner.so_stateids))
3074 list_del_init(&oo->oo_close_lru);
3075 if (oo->oo_flags & NFS4_OO_NEW) {
3076 if (status) {
3077 release_openowner(oo);
3078 open->op_openowner = NULL;
3079 } else
3080 oo->oo_flags &= ~NFS4_OO_NEW;
3081 }
3082 }
32513b40
BF		 3083 if (open->op_file)
3084 nfsd4_free_file(open->op_file);
4cdc951b
BF		 3085 if (open->op_stp)
3086 nfs4_free_stateid(open->op_stp);
d29b20cd
BF		 3087}
3088
b37ad28b 3089__be32
b591480b
BF		 3090nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3091 clientid_t *clid)
1da177e4
LT		 3092{
3093 struct nfs4_client *clp;
b37ad28b 3094 __be32 status;
1da177e4
LT		 3095
3096 nfs4_lock_state();
3097 dprintk("process_renew(%08x/%08x): starting\n",
3098 clid->cl_boot, clid->cl_id);
3099 status = nfserr_stale_clientid;
3100 if (STALE_CLIENTID(clid))
3101 goto out;
3102 clp = find_confirmed_client(clid);
3103 status = nfserr_expired;
3104 if (clp == NULL) {
3105 /* We assume the client took too long to RENEW. */
3106 dprintk("nfsd4_renew: clientid not found!\n");
3107 goto out;
3108 }
1da177e4 3109 status = nfserr_cb_path_down;
ea1da636 3110 if (!list_empty(&clp->cl_delegations)
77a3569d 3111 && clp->cl_cb_state != NFSD4_CB_UP)
1da177e4
LT		 3112 goto out;
3113 status = nfs_ok;
3114out:
3115 nfs4_unlock_state();
3116 return status;
3117}
3118
c47d832b 3119static struct lock_manager nfsd4_manager = {
af558e33
BF		 3120};
3121
33dcc481
JL		 3122static bool grace_ended;
3123
a76b4319 3124static void
af558e33 3125nfsd4_end_grace(void)
a76b4319 3126{
33dcc481
JL		 3127 /* do nothing if grace period already ended */
3128 if (grace_ended)
3129 return;
3130
a76b4319 3131 dprintk("NFSD: end of grace period\n");
33dcc481 3132 grace_ended = true;
2a4317c5 3133 nfsd4_record_grace_done(&init_net, boot_time);
af558e33 3134 locks_end_grace(&nfsd4_manager);
e46b498c
BF		 3135 /*
3136 * Now that every NFSv4 client has had the chance to recover and
3137 * to see the (possibly new, possibly shorter) lease time, we
3138 * can safely set the next grace time to the current lease time:
3139 */
3140 nfsd4_grace = nfsd4_lease;
a76b4319
N		 3141}
3142
fd39ca9a 3143static time_t
1da177e4
LT		 3144nfs4_laundromat(void)
3145{
3146 struct nfs4_client *clp;
fe0750e5 3147 struct nfs4_openowner *oo;
1da177e4
LT		 3148 struct nfs4_delegation *dp;
3149 struct list_head *pos, *next, reaplist;
cf07d2ea
BF		 3150 time_t cutoff = get_seconds() - nfsd4_lease;
3151 time_t t, clientid_val = nfsd4_lease;
3152 time_t u, test_val = nfsd4_lease;
1da177e4
LT		 3153
3154 nfs4_lock_state();
3155
3156 dprintk("NFSD: laundromat service - starting\n");
33dcc481 3157 nfsd4_end_grace();
36acb66b
BH		 3158 INIT_LIST_HEAD(&reaplist);
3159 spin_lock(&client_lock);
1da177e4
LT		 3160 list_for_each_safe(pos, next, &client_lru) {
3161 clp = list_entry(pos, struct nfs4_client, cl_lru);
3162 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3163 t = clp->cl_time - cutoff;
3164 if (clientid_val > t)
3165 clientid_val = t;
3166 break;
3167 }
d7682988
BH		 3168 if (atomic_read(&clp->cl_refcount)) {
3169 dprintk("NFSD: client in use (clientid %08x)\n",
3170 clp->cl_clientid.cl_id);
3171 continue;
3172 }
3173 unhash_client_locked(clp);
3174 list_add(&clp->cl_lru, &reaplist);
36acb66b
BH		 3175 }
3176 spin_unlock(&client_lock);
3177 list_for_each_safe(pos, next, &reaplist) {
3178 clp = list_entry(pos, struct nfs4_client, cl_lru);
1da177e4
LT		 3179 dprintk("NFSD: purging unused client (clientid %08x)\n",
3180 clp->cl_clientid.cl_id);
2a4317c5 3181 nfsd4_client_record_remove(clp);
1da177e4
LT		 3182 expire_client(clp);
3183 }
1da177e4
LT		 3184 spin_lock(&recall_lock);
3185 list_for_each_safe(pos, next, &del_recall_lru) {
3186 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3187 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3188 u = dp->dl_time - cutoff;
3189 if (test_val > u)
3190 test_val = u;
3191 break;
3192 }
1da177e4
LT		 3193 list_move(&dp->dl_recall_lru, &reaplist);
3194 }
3195 spin_unlock(&recall_lock);
3196 list_for_each_safe(pos, next, &reaplist) {
3197 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1da177e4
LT		 3198 unhash_delegation(dp);
3199 }
cf07d2ea 3200 test_val = nfsd4_lease;
1da177e4 3201 list_for_each_safe(pos, next, &close_lru) {
fe0750e5
BF		 3202 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3203 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3204 u = oo->oo_time - cutoff;
1da177e4
LT		 3205 if (test_val > u)
3206 test_val = u;
3207 break;
3208 }
fe0750e5 3209 release_openowner(oo);
1da177e4
LT		 3210 }
3211 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3212 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3213 nfs4_unlock_state();
3214 return clientid_val;
3215}
3216
a254b246
HH		 3217static struct workqueue_struct *laundry_wq;
3218static void laundromat_main(struct work_struct *);
3219static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3220
3221static void
c4028958 3222laundromat_main(struct work_struct *not_used)
1da177e4
LT		 3223{
3224 time_t t;
3225
3226 t = nfs4_laundromat();
3227 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 3228 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 3229}
3230
f7a4d872 3231static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
1da177e4 3232{
f7a4d872
BF		 3233 if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3234 return nfserr_bad_stateid;
3235 return nfs_ok;
1da177e4
LT		 3236}
3237
3238static int
3239STALE_STATEID(stateid_t *stateid)
3240{
d3b313a4 3241 if (stateid->si_opaque.so_clid.cl_boot == boot_time)
e4e83ea4
BF		 3242 return 0;
3243 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
8c10cbdb 3244 STATEID_VAL(stateid));
e4e83ea4 3245 return 1;
1da177e4
LT		 3246}
3247
3248static inline int
82c5ff1b 3249access_permit_read(struct nfs4_ol_stateid *stp)
1da177e4 3250{
82c5ff1b
JL		 3251 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3252 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3253 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
1da177e4
LT		 3254}
3255
3256static inline int
82c5ff1b 3257access_permit_write(struct nfs4_ol_stateid *stp)
1da177e4 3258{
82c5ff1b
JL		 3259 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3260 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
1da177e4
LT		 3261}
3262
3263static
dcef0413 3264__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
1da177e4 3265{
b37ad28b 3266 __be32 status = nfserr_openmode;
1da177e4 3267
02921914
BF		 3268 /* For lock stateid's, we test the parent open, not the lock: */
3269 if (stp->st_openstp)
3270 stp = stp->st_openstp;
82c5ff1b 3271 if ((flags & WR_STATE) && !access_permit_write(stp))
1da177e4 3272 goto out;
82c5ff1b 3273 if ((flags & RD_STATE) && !access_permit_read(stp))
1da177e4
LT		 3274 goto out;
3275 status = nfs_ok;
3276out:
3277 return status;
3278}
3279
b37ad28b 3280static inline __be32
1da177e4
LT		 3281check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
3282{
203a8c8e 3283 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 3284 return nfs_ok;
af558e33 3285 else if (locks_in_grace()) {
25985edc 3286 /* Answer in remaining cases depends on existence of
1da177e4
LT		 3287 * conflicting state; so we must wait out the grace period. */
3288 return nfserr_grace;
3289 } else if (flags & WR_STATE)
3290 return nfs4_share_conflict(current_fh,
3291 NFS4_SHARE_DENY_WRITE);
3292 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3293 return nfs4_share_conflict(current_fh,
3294 NFS4_SHARE_DENY_READ);
3295}
3296
3297/*
3298 * Allow READ/WRITE during grace period on recovered state only for files
3299 * that are not able to provide mandatory locking.
3300 */
3301static inline int
18f82731 3302grace_disallows_io(struct inode *inode)
1da177e4 3303{
203a8c8e 3304 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 3305}
3306
81b82965
BF		 3307/* Returns true iff a is later than b: */
3308static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3309{
3310 return (s32)a->si_generation - (s32)b->si_generation > 0;
3311}
3312
57b7b43b 3313static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
0836f587 3314{
6668958f
AA		 3315 /*
3316 * When sessions are used the stateid generation number is ignored
3317 * when it is zero.
3318 */
28dde241 3319 if (has_session && in->si_generation == 0)
81b82965
BF		 3320 return nfs_ok;
3321
3322 if (in->si_generation == ref->si_generation)
3323 return nfs_ok;
6668958f 3324
0836f587 3325 /* If the client sends us a stateid from the future, it's buggy: */
81b82965 3326 if (stateid_generation_after(in, ref))
0836f587
BF		 3327 return nfserr_bad_stateid;
3328 /*
81b82965
BF		 3329 * However, we could see a stateid from the past, even from a
3330 * non-buggy client. For example, if the client sends a lock
3331 * while some IO is outstanding, the lock may bump si_generation
3332 * while the IO is still in flight. The client could avoid that
3333 * situation by waiting for responses on all the IO requests,
3334 * but better performance may result in retrying IO that
3335 * receives an old_stateid error if requests are rarely
3336 * reordered in flight:
0836f587 3337 */
81b82965 3338 return nfserr_old_stateid;
0836f587
BF		 3339}
3340
7df302f7 3341static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
17456804 3342{
97b7e3b6
BF		 3343 struct nfs4_stid *s;
3344 struct nfs4_ol_stateid *ols;
3345 __be32 status;
17456804 3346
7df302f7
CL		 3347 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3348 return nfserr_bad_stateid;
3349 /* Client debugging aid. */
3350 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3351 char addr_str[INET6_ADDRSTRLEN];
3352 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3353 sizeof(addr_str));
3354 pr_warn_ratelimited("NFSD: client %s testing state ID "
3355 "with incorrect client ID\n", addr_str);
3356 return nfserr_bad_stateid;
3357 }
38c2f4b1 3358 s = find_stateid(cl, stateid);
97b7e3b6 3359 if (!s)
7df302f7 3360 return nfserr_bad_stateid;
36279ac1 3361 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
17456804 3362 if (status)
97b7e3b6
BF		 3363 return status;
3364 if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3365 return nfs_ok;
3366 ols = openlockstateid(s);
3367 if (ols->st_stateowner->so_is_open_owner
dad1c067 3368 && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
97b7e3b6
BF		 3369 return nfserr_bad_stateid;
3370 return nfs_ok;
17456804
BS		 3371}
3372
38c2f4b1
BF		 3373static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
3374{
3375 struct nfs4_client *cl;
3376
3377 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3378 return nfserr_bad_stateid;
3379 if (STALE_STATEID(stateid))
3380 return nfserr_stale_stateid;
3381 cl = find_confirmed_client(&stateid->si_opaque.so_clid);
3382 if (!cl)
3383 return nfserr_expired;
3384 *s = find_stateid_by_type(cl, stateid, typemask);
3385 if (!*s)
3386 return nfserr_bad_stateid;
3387 return nfs_ok;
3388
3389}
3390
1da177e4
LT		 3391/*
3392* Checks for stateid operations
3393*/
b37ad28b 3394__be32
dd453dfd
BH		 3395nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
3396 stateid_t *stateid, int flags, struct file **filpp)
1da177e4 3397{
69064a27 3398 struct nfs4_stid *s;
dcef0413 3399 struct nfs4_ol_stateid *stp = NULL;
1da177e4 3400 struct nfs4_delegation *dp = NULL;
dd453dfd 3401 struct svc_fh *current_fh = &cstate->current_fh;
1da177e4 3402 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 3403 __be32 status;
1da177e4 3404
1da177e4
LT		 3405 if (filpp)
3406 *filpp = NULL;
3407
18f82731 3408 if (grace_disallows_io(ino))
1da177e4
LT		 3409 return nfserr_grace;
3410
3411 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3412 return check_special_stateids(current_fh, stateid, flags);
3413
38c2f4b1
BF		 3414 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
3415 if (status)
3416 return status;
69064a27
BF		 3417 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3418 if (status)
3419 goto out;
f7a4d872
BF		 3420 switch (s->sc_type) {
3421 case NFS4_DELEG_STID:
69064a27 3422 dp = delegstateid(s);
dc9bf700
BF		 3423 status = nfs4_check_delegmode(dp, flags);
3424 if (status)
3425 goto out;
43b0178e 3426 if (filpp) {
acfdf5c3 3427 *filpp = dp->dl_file->fi_deleg_file;
43b0178e
DC		 3428 BUG_ON(!*filpp);
3429 }
f7a4d872
BF		 3430 break;
3431 case NFS4_OPEN_STID:
3432 case NFS4_LOCK_STID:
69064a27 3433 stp = openlockstateid(s);
f7a4d872
BF		 3434 status = nfs4_check_fh(current_fh, stp);
3435 if (status)
1da177e4 3436 goto out;
fe0750e5 3437 if (stp->st_stateowner->so_is_open_owner
dad1c067 3438 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
1da177e4 3439 goto out;
a4455be0
BF		 3440 status = nfs4_check_openmode(stp, flags);
3441 if (status)
1da177e4 3442 goto out;
f9d7562f
BF		 3443 if (filpp) {
3444 if (flags & RD_STATE)
3445 *filpp = find_readable_file(stp->st_file);
3446 else
3447 *filpp = find_writeable_file(stp->st_file);
f9d7562f 3448 }
f7a4d872
BF		 3449 break;
3450 default:
3451 return nfserr_bad_stateid;
1da177e4
LT		 3452 }
3453 status = nfs_ok;
3454out:
3455 return status;
3456}
3457
e1ca12df 3458static __be32
dcef0413 3459nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
e1ca12df 3460{
fe0750e5 3461 if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
e1ca12df
BS		 3462 return nfserr_locks_held;
3463 release_lock_stateid(stp);
3464 return nfs_ok;
3465}
3466
17456804
BS		 3467/*
3468 * Test if the stateid is valid
3469 */
3470__be32
3471nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3472 struct nfsd4_test_stateid *test_stateid)
3473{
03cfb420
BS		 3474 struct nfsd4_test_stateid_id *stateid;
3475 struct nfs4_client *cl = cstate->session->se_client;
3476
3477 nfs4_lock_state();
3478 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
7df302f7
CL		 3479 stateid->ts_id_status =
3480 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
03cfb420
BS		 3481 nfs4_unlock_state();
3482
17456804
BS		 3483 return nfs_ok;
3484}
3485
e1ca12df
BS		 3486__be32
3487nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3488 struct nfsd4_free_stateid *free_stateid)
3489{
3490 stateid_t *stateid = &free_stateid->fr_stateid;
2da1cec7 3491 struct nfs4_stid *s;
38c2f4b1 3492 struct nfs4_client *cl = cstate->session->se_client;
2da1cec7 3493 __be32 ret = nfserr_bad_stateid;
e1ca12df
BS		 3494
3495 nfs4_lock_state();
38c2f4b1 3496 s = find_stateid(cl, stateid);
2da1cec7 3497 if (!s)
81b82965 3498 goto out;
2da1cec7
BF		 3499 switch (s->sc_type) {
3500 case NFS4_DELEG_STID:
e1ca12df
BS		 3501 ret = nfserr_locks_held;
3502 goto out;
2da1cec7
BF		 3503 case NFS4_OPEN_STID:
3504 case NFS4_LOCK_STID:
3505 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3506 if (ret)
3507 goto out;
3508 if (s->sc_type == NFS4_LOCK_STID)
3509 ret = nfsd4_free_lock_stateid(openlockstateid(s));
3510 else
3511 ret = nfserr_locks_held;
f7a4d872
BF		 3512 break;
3513 default:
3514 ret = nfserr_bad_stateid;
e1ca12df 3515 }
e1ca12df
BS		 3516out:
3517 nfs4_unlock_state();
3518 return ret;
3519}
3520
4c4cd222
N		 3521static inline int
3522setlkflg (int type)
3523{
3524 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3525 RD_STATE : WR_STATE;
3526}
1da177e4 3527
dcef0413 3528static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
c0a5d93e
BF		 3529{
3530 struct svc_fh *current_fh = &cstate->current_fh;
3531 struct nfs4_stateowner *sop = stp->st_stateowner;
3532 __be32 status;
3533
c0a5d93e
BF		 3534 status = nfsd4_check_seqid(cstate, sop, seqid);
3535 if (status)
3536 return status;
f7a4d872
BF		 3537 if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3538 /*
3539 * "Closed" stateid's exist *only* to return
3540 * nfserr_replay_me from the previous step.
3541 */
3542 return nfserr_bad_stateid;
3543 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3544 if (status)
3545 return status;
3546 return nfs4_check_fh(current_fh, stp);
c0a5d93e
BF		 3547}
3548
1da177e4
LT		 3549/*
3550 * Checks for sequence id mutating operations.
3551 */
b37ad28b 3552static __be32
dd453dfd 3553nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
2288d0e3 3554 stateid_t *stateid, char typemask,
dcef0413 3555 struct nfs4_ol_stateid **stpp)
1da177e4 3556{
0836f587 3557 __be32 status;
38c2f4b1 3558 struct nfs4_stid *s;
1da177e4 3559
8c10cbdb
BH		 3560 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3561 seqid, STATEID_VAL(stateid));
3a4f98bb 3562
1da177e4 3563 *stpp = NULL;
38c2f4b1 3564 status = nfsd4_lookup_stateid(stateid, typemask, &s);
c0a5d93e
BF		 3565 if (status)
3566 return status;
38c2f4b1 3567 *stpp = openlockstateid(s);
c0a5d93e 3568 cstate->replay_owner = (*stpp)->st_stateowner;
1da177e4 3569
c0a5d93e
BF		 3570 return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3571}
39325bd0 3572
dcef0413 3573static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
c0a5d93e
BF		 3574{
3575 __be32 status;
3576 struct nfs4_openowner *oo;
1da177e4 3577
c0a5d93e 3578 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
2288d0e3 3579 NFS4_OPEN_STID, stpp);
7a8711c9
BF		 3580 if (status)
3581 return status;
c0a5d93e 3582 oo = openowner((*stpp)->st_stateowner);
dad1c067 3583 if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3a4f98bb 3584 return nfserr_bad_stateid;
3a4f98bb 3585 return nfs_ok;
1da177e4
LT		 3586}
3587
b37ad28b 3588__be32
ca364317 3589nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3590 struct nfsd4_open_confirm *oc)
1da177e4 3591{
b37ad28b 3592 __be32 status;
fe0750e5 3593 struct nfs4_openowner *oo;
dcef0413 3594 struct nfs4_ol_stateid *stp;
1da177e4
LT		 3595
3596 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 3597 (int)cstate->current_fh.fh_dentry->d_name.len,
3598 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3599
ca364317 3600 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 3601 if (status)
3602 return status;
1da177e4
LT		 3603
3604 nfs4_lock_state();
3605
9072d5c6 3606 status = nfs4_preprocess_seqid_op(cstate,
ca364317 3607 oc->oc_seqid, &oc->oc_req_stateid,
2288d0e3 3608 NFS4_OPEN_STID, &stp);
9072d5c6 3609 if (status)
68b66e82 3610 goto out;
fe0750e5 3611 oo = openowner(stp->st_stateowner);
68b66e82 3612 status = nfserr_bad_stateid;
dad1c067 3613 if (oo->oo_flags & NFS4_OO_CONFIRMED)
68b66e82 3614 goto out;
dad1c067 3615 oo->oo_flags |= NFS4_OO_CONFIRMED;
dcef0413
BF		 3616 update_stateid(&stp->st_stid.sc_stateid);
3617 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
8c10cbdb 3618 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
dcef0413 3619 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
c7b9a459 3620
2a4317c5 3621 nfsd4_client_record_create(oo->oo_owner.so_client);
68b66e82 3622 status = nfs_ok;
1da177e4 3623out:
5ec094c1
BF		 3624 if (!cstate->replay_owner)
3625 nfs4_unlock_state();
1da177e4
LT		 3626 return status;
3627}
3628
6409a5a6 3629static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
1da177e4 3630{
82c5ff1b 3631 if (!test_access(access, stp))
6409a5a6
BF		 3632 return;
3633 nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
82c5ff1b 3634 clear_access(access, stp);
6409a5a6 3635}
f197c271 3636
6409a5a6
BF		 3637static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3638{
3639 switch (to_access) {
3640 case NFS4_SHARE_ACCESS_READ:
3641 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3642 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3643 break;
3644 case NFS4_SHARE_ACCESS_WRITE:
3645 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3646 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3647 break;
3648 case NFS4_SHARE_ACCESS_BOTH:
3649 break;
3650 default:
3651 BUG();
1da177e4
LT		 3652 }
3653}
3654
3655static void
ce0fc43c 3656reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
1da177e4
LT		 3657{
3658 int i;
3659 for (i = 0; i < 4; i++) {
3660 if ((i & deny) != i)
ce0fc43c 3661 clear_deny(i, stp);
1da177e4
LT		 3662 }
3663}
3664
b37ad28b 3665__be32
ca364317
BF		 3666nfsd4_open_downgrade(struct svc_rqst *rqstp,
3667 struct nfsd4_compound_state *cstate,
a4f1706a 3668 struct nfsd4_open_downgrade *od)
1da177e4 3669{
b37ad28b 3670 __be32 status;
dcef0413 3671 struct nfs4_ol_stateid *stp;
1da177e4
LT		 3672
3673 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 3674 (int)cstate->current_fh.fh_dentry->d_name.len,
3675 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3676
c30e92df 3677 /* We don't yet support WANT bits: */
2c8bd7e0
BH		 3678 if (od->od_deleg_want)
3679 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3680 od->od_deleg_want);
1da177e4
LT		 3681
3682 nfs4_lock_state();
c0a5d93e
BF		 3683 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3684 &od->od_stateid, &stp);
9072d5c6 3685 if (status)
1da177e4 3686 goto out;
1da177e4 3687 status = nfserr_inval;
82c5ff1b
JL		 3688 if (!test_access(od->od_share_access, stp)) {
3689 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
1da177e4
LT		 3690 stp->st_access_bmap, od->od_share_access);
3691 goto out;
3692 }
ce0fc43c 3693 if (!test_deny(od->od_share_deny, stp)) {
1da177e4
LT		 3694 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3695 stp->st_deny_bmap, od->od_share_deny);
3696 goto out;
3697 }
6409a5a6 3698 nfs4_stateid_downgrade(stp, od->od_share_access);
1da177e4 3699
ce0fc43c 3700 reset_union_bmap_deny(od->od_share_deny, stp);
1da177e4 3701
dcef0413
BF		 3702 update_stateid(&stp->st_stid.sc_stateid);
3703 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
1da177e4
LT		 3704 status = nfs_ok;
3705out:
5ec094c1
BF		 3706 if (!cstate->replay_owner)
3707 nfs4_unlock_state();
1da177e4
LT		 3708 return status;
3709}
3710
38c387b5
BF		 3711void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3712{
3713 struct nfs4_openowner *oo;
3714 struct nfs4_ol_stateid *s;
3715
3716 if (!so->so_is_open_owner)
3717 return;
3718 oo = openowner(so);
3719 s = oo->oo_last_closed_stid;
3720 if (!s)
3721 return;
3722 if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3723 /* Release the last_closed_stid on the next seqid bump: */
3724 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3725 return;
3726 }
3727 oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
f7a4d872
BF		 3728 release_last_closed_stateid(oo);
3729}
3730
3731static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3732{
3733 unhash_open_stateid(s);
3734 s->st_stid.sc_type = NFS4_CLOSED_STID;
38c387b5
BF		 3735}
3736
1da177e4
LT		 3737/*
3738 * nfs4_unlock_state() called after encode
3739 */
b37ad28b 3740__be32
ca364317 3741nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3742 struct nfsd4_close *close)
1da177e4 3743{
b37ad28b 3744 __be32 status;
fe0750e5 3745 struct nfs4_openowner *oo;
dcef0413 3746 struct nfs4_ol_stateid *stp;
1da177e4
LT		 3747
3748 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 3749 (int)cstate->current_fh.fh_dentry->d_name.len,
3750 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 3751
3752 nfs4_lock_state();
f7a4d872
BF		 3753 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3754 &close->cl_stateid,
3755 NFS4_OPEN_STID|NFS4_CLOSED_STID,
3756 &stp);
9072d5c6 3757 if (status)
1da177e4 3758 goto out;
fe0750e5 3759 oo = openowner(stp->st_stateowner);
1da177e4 3760 status = nfs_ok;
dcef0413
BF		 3761 update_stateid(&stp->st_stid.sc_stateid);
3762 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
1da177e4 3763
f7a4d872 3764 nfsd4_close_open_stateid(stp);
38c387b5 3765 oo->oo_last_closed_stid = stp;
04ef5954 3766
74dbafaf
BF		 3767 if (list_empty(&oo->oo_owner.so_stateids)) {
3768 if (cstate->minorversion) {
3769 release_openowner(oo);
3770 cstate->replay_owner = NULL;
3771 } else {
3772 /*
3773 * In the 4.0 case we need to keep the owners around a
3774 * little while to handle CLOSE replay.
3775 */
3776 if (list_empty(&oo->oo_owner.so_stateids))
3777 move_to_close_lru(oo);
3778 }
3779 }
1da177e4 3780out:
5ec094c1
BF		 3781 if (!cstate->replay_owner)
3782 nfs4_unlock_state();
1da177e4
LT		 3783 return status;
3784}
3785
b37ad28b 3786__be32
ca364317
BF		 3787nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3788 struct nfsd4_delegreturn *dr)
1da177e4 3789{
203a8c8e
BF		 3790 struct nfs4_delegation *dp;
3791 stateid_t *stateid = &dr->dr_stateid;
38c2f4b1 3792 struct nfs4_stid *s;
203a8c8e 3793 struct inode *inode;
b37ad28b 3794 __be32 status;
1da177e4 3795
ca364317 3796 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 3797 return status;
3798 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3799
3800 nfs4_lock_state();
38c2f4b1
BF		 3801 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s);
3802 if (status)
203a8c8e 3803 goto out;
38c2f4b1 3804 dp = delegstateid(s);
d5477a8d 3805 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
203a8c8e
BF		 3806 if (status)
3807 goto out;
203a8c8e
BF		 3808
3809 unhash_delegation(dp);
1da177e4 3810out:
203a8c8e
BF		 3811 nfs4_unlock_state();
3812
1da177e4
LT		 3813 return status;
3814}
3815
3816
1da177e4 3817#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
1da177e4 3818
009673b4
BF		 3819#define LOCKOWNER_INO_HASH_BITS 8
3820#define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
3821#define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
1da177e4 3822
87df4de8
BH		 3823static inline u64
3824end_offset(u64 start, u64 len)
3825{
3826 u64 end;
3827
3828 end = start + len;
3829 return end >= start ? end: NFS4_MAX_UINT64;
3830}
3831
3832/* last octet in a range */
3833static inline u64
3834last_byte_offset(u64 start, u64 len)
3835{
3836 u64 end;
3837
3838 BUG_ON(!len);
3839 end = start + len;
3840 return end > start ? end - 1: NFS4_MAX_UINT64;
3841}
3842
009673b4 3843static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
1da177e4
LT		 3844{
3845 return (file_hashval(inode) + cl_id
3846 + opaque_hashval(ownername->data, ownername->len))
009673b4 3847 & LOCKOWNER_INO_HASH_MASK;
1da177e4
LT		 3848}
3849
009673b4 3850static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
1da177e4 3851
1da177e4
LT		 3852/*
3853 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3854 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3855 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3856 * locking, this prevents us from being completely protocol-compliant. The
3857 * real solution to this problem is to start using unsigned file offsets in
3858 * the VFS, but this is a very deep change!
3859 */
3860static inline void
3861nfs4_transform_lock_offset(struct file_lock *lock)
3862{
3863 if (lock->fl_start < 0)
3864 lock->fl_start = OFFSET_MAX;
3865 if (lock->fl_end < 0)
3866 lock->fl_end = OFFSET_MAX;
3867}
3868
d5b9026a
N		 3869/* Hack!: For now, we're defining this just so we can use a pointer to it
3870 * as a unique cookie to identify our (NFSv4's) posix locks. */
7b021967 3871static const struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 3872};
1da177e4
LT		 3873
3874static inline void
3875nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3876{
fe0750e5 3877 struct nfs4_lockowner *lo;
1da177e4 3878
d5b9026a 3879 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
fe0750e5
BF		 3880 lo = (struct nfs4_lockowner *) fl->fl_owner;
3881 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3882 lo->lo_owner.so_owner.len, GFP_KERNEL);
7c13f344
BF		 3883 if (!deny->ld_owner.data)
3884 /* We just don't care that much */
3885 goto nevermind;
fe0750e5
BF		 3886 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3887 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
d5b9026a 3888 } else {
7c13f344
BF		 3889nevermind:
3890 deny->ld_owner.len = 0;
3891 deny->ld_owner.data = NULL;
d5b9026a
N		 3892 deny->ld_clientid.cl_boot = 0;
3893 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 3894 }
3895 deny->ld_start = fl->fl_start;
87df4de8
BH		 3896 deny->ld_length = NFS4_MAX_UINT64;
3897 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 3898 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3899 deny->ld_type = NFS4_READ_LT;
3900 if (fl->fl_type != F_RDLCK)
3901 deny->ld_type = NFS4_WRITE_LT;
3902}
3903
b93d87c1
BF		 3904static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3905{
3906 struct nfs4_ol_stateid *lst;
3907
3908 if (!same_owner_str(&lo->lo_owner, owner, clid))
3909 return false;
3910 lst = list_first_entry(&lo->lo_owner.so_stateids,
3911 struct nfs4_ol_stateid, st_perstateowner);
3912 return lst->st_file->fi_inode == inode;
3913}
3914
fe0750e5
BF		 3915static struct nfs4_lockowner *
3916find_lockowner_str(struct inode *inode, clientid_t *clid,
1da177e4
LT		 3917 struct xdr_netobj *owner)
3918{
009673b4 3919 unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
b93d87c1 3920 struct nfs4_lockowner *lo;
1da177e4 3921
009673b4 3922 list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
b93d87c1
BF		 3923 if (same_lockowner_ino(lo, inode, clid, owner))
3924 return lo;
1da177e4
LT		 3925 }
3926 return NULL;
3927}
3928
dcef0413 3929static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
ff194bd9 3930{
009673b4
BF		 3931 struct inode *inode = open_stp->st_file->fi_inode;
3932 unsigned int inohash = lockowner_ino_hashval(inode,
3933 clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3934
16bfdaaf 3935 list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
009673b4 3936 list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
fe0750e5 3937 list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
ff194bd9
BF		 3938}
3939
1da177e4
LT		 3940/*
3941 * Alloc a lock owner structure.
3942 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
25985edc 3943 * occurred.
1da177e4 3944 *
16bfdaaf 3945 * strhashval = ownerstr_hashval
1da177e4
LT		 3946 */
3947
fe0750e5 3948static struct nfs4_lockowner *
dcef0413 3949alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
fe0750e5 3950 struct nfs4_lockowner *lo;
1da177e4 3951
fe0750e5
BF		 3952 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
3953 if (!lo)
1da177e4 3954 return NULL;
fe0750e5
BF		 3955 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
3956 lo->lo_owner.so_is_open_owner = 0;
b59e3c0e
NB		 3957 /* It is the openowner seqid that will be incremented in encode in the
3958 * case of new lockowners; so increment the lock seqid manually: */
fe0750e5
BF		 3959 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
3960 hash_lockowner(lo, strhashval, clp, open_stp);
3961 return lo;
1da177e4
LT		 3962}
3963
dcef0413
BF		 3964static struct nfs4_ol_stateid *
3965alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
1da177e4 3966{
dcef0413 3967 struct nfs4_ol_stateid *stp;
d3b313a4 3968 struct nfs4_client *clp = lo->lo_owner.so_client;
1da177e4 3969
996e0938 3970 stp = nfs4_alloc_stateid(clp);
5ac049ac 3971 if (stp == NULL)
6136d2b4 3972 return NULL;
996e0938 3973 init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
8beefa24 3974 list_add(&stp->st_perfile, &fp->fi_stateids);
fe0750e5
BF		 3975 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
3976 stp->st_stateowner = &lo->lo_owner;
13cd2184 3977 get_nfs4_file(fp);
1da177e4 3978 stp->st_file = fp;
0997b173 3979 stp->st_access_bmap = 0;
1da177e4 3980 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 3981 stp->st_openstp = open_stp;
1da177e4
LT		 3982 return stp;
3983}
3984
fd39ca9a 3985static int
1da177e4
LT		 3986check_lock_length(u64 offset, u64 length)
3987{
87df4de8 3988 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3989 LOFF_OVERFLOW(offset, length)));
3990}
3991
dcef0413 3992static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
0997b173
BF		 3993{
3994 struct nfs4_file *fp = lock_stp->st_file;
3995 int oflag = nfs4_access_to_omode(access);
3996
82c5ff1b 3997 if (test_access(access, lock_stp))
0997b173
BF		 3998 return;
3999 nfs4_file_get_access(fp, oflag);
82c5ff1b 4000 set_access(access, lock_stp);
0997b173
BF		 4001}
4002
2355c596 4003static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
64a284d0
BF		 4004{
4005 struct nfs4_file *fi = ost->st_file;
4006 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4007 struct nfs4_client *cl = oo->oo_owner.so_client;
4008 struct nfs4_lockowner *lo;
4009 unsigned int strhashval;
4010
4011 lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
4012 if (lo) {
4013 if (!cstate->minorversion)
4014 return nfserr_bad_seqid;
4015 /* XXX: a lockowner always has exactly one stateid: */
4016 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4017 struct nfs4_ol_stateid, st_perstateowner);
4018 return nfs_ok;
4019 }
16bfdaaf 4020 strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
64a284d0
BF		 4021 &lock->v.new.owner);
4022 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4023 if (lo == NULL)
4024 return nfserr_jukebox;
4025 *lst = alloc_init_lock_stateid(lo, fi, ost);
4026 if (*lst == NULL) {
4027 release_lockowner(lo);
4028 return nfserr_jukebox;
4029 }
4030 *new = true;
4031 return nfs_ok;
4032}
4033
1da177e4
LT		 4034/*
4035 * LOCK operation
4036 */
b37ad28b 4037__be32
ca364317 4038nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 4039 struct nfsd4_lock *lock)
1da177e4 4040{
fe0750e5
BF		 4041 struct nfs4_openowner *open_sop = NULL;
4042 struct nfs4_lockowner *lock_sop = NULL;
dcef0413 4043 struct nfs4_ol_stateid *lock_stp;
7d947842 4044 struct file *filp = NULL;
1da177e4 4045 struct file_lock file_lock;
8dc7c311 4046 struct file_lock conflock;
b37ad28b 4047 __be32 status = 0;
64a284d0 4048 bool new_state = false;
b34f27aa 4049 int lkflg;
b8dd7b9a 4050 int err;
1da177e4
LT		 4051
4052 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4053 (long long) lock->lk_offset,
4054 (long long) lock->lk_length);
4055
1da177e4
LT		 4056 if (check_lock_length(lock->lk_offset, lock->lk_length))
4057 return nfserr_inval;
4058
ca364317 4059 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 4060 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 4061 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4062 return status;
4063 }
4064
1da177e4
LT		 4065 nfs4_lock_state();
4066
4067 if (lock->lk_is_new) {
dcef0413 4068 struct nfs4_ol_stateid *open_stp = NULL;
684e5638
BF		 4069
4070 if (nfsd4_has_session(cstate))
4071 /* See rfc 5661 18.10.3: given clientid is ignored: */
4072 memcpy(&lock->v.new.clientid,
4073 &cstate->session->se_client->cl_clientid,
4074 sizeof(clientid_t));
4075
1da177e4 4076 status = nfserr_stale_clientid;
684e5638 4077 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 4078 goto out;
1da177e4 4079
1da177e4 4080 /* validate and update open stateid and open seqid */
c0a5d93e 4081 status = nfs4_preprocess_confirmed_seqid_op(cstate,
1da177e4
LT		 4082 lock->lk_new_open_seqid,
4083 &lock->lk_new_open_stateid,
c0a5d93e 4084 &open_stp);
37515177 4085 if (status)
1da177e4 4086 goto out;
fe0750e5 4087 open_sop = openowner(open_stp->st_stateowner);
b34f27aa 4088 status = nfserr_bad_stateid;
684e5638 4089 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
b34f27aa
BF		 4090 &lock->v.new.clientid))
4091 goto out;
64a284d0
BF		 4092 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4093 &lock_stp, &new_state);
e1aaa891 4094 } else
dd453dfd 4095 status = nfs4_preprocess_seqid_op(cstate,
fe0750e5
BF		 4096 lock->lk_old_lock_seqid,
4097 &lock->lk_old_lock_stateid,
2288d0e3 4098 NFS4_LOCK_STID, &lock_stp);
e1aaa891
BF		 4099 if (status)
4100 goto out;
64a284d0 4101 lock_sop = lockowner(lock_stp->st_stateowner);
1da177e4 4102
b34f27aa
BF		 4103 lkflg = setlkflg(lock->lk_type);
4104 status = nfs4_check_openmode(lock_stp, lkflg);
4105 if (status)
4106 goto out;
4107
0dd395dc 4108 status = nfserr_grace;
af558e33 4109 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 4110 goto out;
4111 status = nfserr_no_grace;
af558e33 4112 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 4113 goto out;
4114
1da177e4
LT		 4115 locks_init_lock(&file_lock);
4116 switch (lock->lk_type) {
4117 case NFS4_READ_LT:
4118 case NFS4_READW_LT:
0997b173
BF		 4119 filp = find_readable_file(lock_stp->st_file);
4120 if (filp)
4121 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
1da177e4 4122 file_lock.fl_type = F_RDLCK;
529d7b2a 4123 break;
1da177e4
LT		 4124 case NFS4_WRITE_LT:
4125 case NFS4_WRITEW_LT:
0997b173
BF		 4126 filp = find_writeable_file(lock_stp->st_file);
4127 if (filp)
4128 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
1da177e4 4129 file_lock.fl_type = F_WRLCK;
529d7b2a 4130 break;
1da177e4
LT		 4131 default:
4132 status = nfserr_inval;
4133 goto out;
4134 }
f9d7562f
BF		 4135 if (!filp) {
4136 status = nfserr_openmode;
4137 goto out;
4138 }
b59e3c0e 4139 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 4140 file_lock.fl_pid = current->tgid;
4141 file_lock.fl_file = filp;
4142 file_lock.fl_flags = FL_POSIX;
d5b9026a 4143 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 4144
4145 file_lock.fl_start = lock->lk_offset;
87df4de8 4146 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 4147 nfs4_transform_lock_offset(&file_lock);
4148
4149 /*
4150 * Try to lock the file in the VFS.
4151 * Note: locks.c uses the BKL to protect the inode's lock list.
4152 */
4153
529d7b2a 4154 err = vfs_lock_file(filp, F_SETLK, &file_lock, &conflock);
b8dd7b9a 4155 switch (-err) {
1da177e4 4156 case 0: /* success! */
dcef0413
BF		 4157 update_stateid(&lock_stp->st_stid.sc_stateid);
4158 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
1da177e4 4159 sizeof(stateid_t));
b8dd7b9a 4160 status = 0;
eb76b3fd
AA		 4161 break;
4162 case (EAGAIN): /* conflock holds conflicting lock */
4163 status = nfserr_denied;
4164 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4165 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
4166 break;
1da177e4
LT		 4167 case (EDEADLK):
4168 status = nfserr_deadlock;
eb76b3fd 4169 break;
3e772463 4170 default:
fd85b817 4171 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
3e772463 4172 status = nfserrno(err);
eb76b3fd 4173 break;
1da177e4 4174 }
1da177e4 4175out:
64a284d0 4176 if (status && new_state)
f044ff83 4177 release_lockowner(lock_sop);
5ec094c1
BF		 4178 if (!cstate->replay_owner)
4179 nfs4_unlock_state();
1da177e4
LT		 4180 return status;
4181}
4182
55ef1274
BF		 4183/*
4184 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4185 * so we do a temporary open here just to get an open file to pass to
4186 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
4187 * inode operation.)
4188 */
04da6e9d 4189static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
55ef1274
BF		 4190{
4191 struct file *file;
04da6e9d
AV		 4192 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4193 if (!err) {
4194 err = nfserrno(vfs_test_lock(file, lock));
4195 nfsd_close(file);
4196 }
55ef1274
BF		 4197 return err;
4198}
4199
1da177e4
LT		 4200/*
4201 * LOCKT operation
4202 */
b37ad28b 4203__be32
ca364317
BF		 4204nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4205 struct nfsd4_lockt *lockt)
1da177e4
LT		 4206{
4207 struct inode *inode;
1da177e4 4208 struct file_lock file_lock;
fe0750e5 4209 struct nfs4_lockowner *lo;
b37ad28b 4210 __be32 status;
1da177e4 4211
af558e33 4212 if (locks_in_grace())
1da177e4
LT		 4213 return nfserr_grace;
4214
4215 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4216 return nfserr_inval;
4217
1da177e4
LT		 4218 nfs4_lock_state();
4219
4220 status = nfserr_stale_clientid;
60adfc50 4221 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 4222 goto out;
1da177e4 4223
75c096f7 4224 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4 4225 goto out;
1da177e4 4226
ca364317 4227 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 4228 locks_init_lock(&file_lock);
4229 switch (lockt->lt_type) {
4230 case NFS4_READ_LT:
4231 case NFS4_READW_LT:
4232 file_lock.fl_type = F_RDLCK;
4233 break;
4234 case NFS4_WRITE_LT:
4235 case NFS4_WRITEW_LT:
4236 file_lock.fl_type = F_WRLCK;
4237 break;
4238 default:
2fdada03 4239 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 4240 status = nfserr_inval;
4241 goto out;
4242 }
4243
fe0750e5
BF		 4244 lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4245 if (lo)
4246 file_lock.fl_owner = (fl_owner_t)lo;
1da177e4
LT		 4247 file_lock.fl_pid = current->tgid;
4248 file_lock.fl_flags = FL_POSIX;
4249
4250 file_lock.fl_start = lockt->lt_offset;
87df4de8 4251 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 4252
4253 nfs4_transform_lock_offset(&file_lock);
4254
04da6e9d
AV		 4255 status = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
4256 if (status)
fd85b817 4257 goto out;
04da6e9d 4258
9d6a8c5c 4259 if (file_lock.fl_type != F_UNLCK) {
1da177e4 4260 status = nfserr_denied;
9d6a8c5c 4261 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 4262 }
4263out:
4264 nfs4_unlock_state();
4265 return status;
4266}
4267
b37ad28b 4268__be32
ca364317 4269nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 4270 struct nfsd4_locku *locku)
1da177e4 4271{
dcef0413 4272 struct nfs4_ol_stateid *stp;
1da177e4
LT		 4273 struct file *filp = NULL;
4274 struct file_lock file_lock;
b37ad28b 4275 __be32 status;
b8dd7b9a 4276 int err;
1da177e4
LT		 4277
4278 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4279 (long long) locku->lu_offset,
4280 (long long) locku->lu_length);
4281
4282 if (check_lock_length(locku->lu_offset, locku->lu_length))
4283 return nfserr_inval;
4284
4285 nfs4_lock_state();
4286
9072d5c6 4287 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
2288d0e3 4288 &locku->lu_stateid, NFS4_LOCK_STID, &stp);
9072d5c6 4289 if (status)
1da177e4 4290 goto out;
f9d7562f
BF		 4291 filp = find_any_file(stp->st_file);
4292 if (!filp) {
4293 status = nfserr_lock_range;
4294 goto out;
4295 }
1da177e4
LT		 4296 BUG_ON(!filp);
4297 locks_init_lock(&file_lock);
4298 file_lock.fl_type = F_UNLCK;
fe0750e5 4299 file_lock.fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
1da177e4
LT		 4300 file_lock.fl_pid = current->tgid;
4301 file_lock.fl_file = filp;
4302 file_lock.fl_flags = FL_POSIX;
d5b9026a 4303 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 4304 file_lock.fl_start = locku->lu_offset;
4305
87df4de8 4306 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 4307 nfs4_transform_lock_offset(&file_lock);
4308
4309 /*
4310 * Try to unlock the file in the VFS.
4311 */
fd85b817 4312 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 4313 if (err) {
fd85b817 4314 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 4315 goto out_nfserr;
4316 }
4317 /*
4318 * OK, unlock succeeded; the only thing left to do is update the stateid.
4319 */
dcef0413
BF		 4320 update_stateid(&stp->st_stid.sc_stateid);
4321 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
1da177e4
LT		 4322
4323out:
71c3bcd7
BF		 4324 if (!cstate->replay_owner)
4325 nfs4_unlock_state();
1da177e4
LT		 4326 return status;
4327
4328out_nfserr:
b8dd7b9a 4329 status = nfserrno(err);
1da177e4
LT		 4330 goto out;
4331}
4332
4333/*
4334 * returns
4335 * 1: locks held by lockowner
4336 * 0: no locks held by lockowner
4337 */
4338static int
fe0750e5 4339check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
1da177e4
LT		 4340{
4341 struct file_lock **flpp;
f9d7562f 4342 struct inode *inode = filp->fi_inode;
1da177e4
LT		 4343 int status = 0;
4344
b89f4321 4345 lock_flocks();
1da177e4 4346 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 4347 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 4348 status = 1;
4349 goto out;
796dadfd 4350 }
1da177e4
LT		 4351 }
4352out:
b89f4321 4353 unlock_flocks();
1da177e4
LT		 4354 return status;
4355}
4356
b37ad28b 4357__be32
b591480b
BF		 4358nfsd4_release_lockowner(struct svc_rqst *rqstp,
4359 struct nfsd4_compound_state *cstate,
4360 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 4361{
4362 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe 4363 struct nfs4_stateowner *sop;
fe0750e5 4364 struct nfs4_lockowner *lo;
dcef0413 4365 struct nfs4_ol_stateid *stp;
1da177e4 4366 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe 4367 struct list_head matches;
16bfdaaf 4368 unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
b37ad28b 4369 __be32 status;
1da177e4
LT		 4370
4371 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4372 clid->cl_boot, clid->cl_id);
4373
4374 /* XXX check for lease expiration */
4375
4376 status = nfserr_stale_clientid;
849823c5 4377 if (STALE_CLIENTID(clid))
1da177e4 4378 return status;
1da177e4
LT		 4379
4380 nfs4_lock_state();
4381
3e9e3dbe 4382 status = nfserr_locks_held;
3e9e3dbe 4383 INIT_LIST_HEAD(&matches);
06f1f864 4384
16bfdaaf
BF		 4385 list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) {
4386 if (sop->so_is_open_owner)
4387 continue;
06f1f864
BF		 4388 if (!same_owner_str(sop, owner, clid))
4389 continue;
4390 list_for_each_entry(stp, &sop->so_stateids,
4391 st_perstateowner) {
4392 lo = lockowner(sop);
4393 if (check_for_locks(stp->st_file, lo))
4394 goto out;
4395 list_add(&lo->lo_list, &matches);
1da177e4 4396 }
3e9e3dbe
N		 4397 }
4398 /* Clients probably won't expect us to return with some (but not all)
4399 * of the lockowner state released; so don't release any until all
4400 * have been checked. */
4401 status = nfs_ok;
0fa822e4 4402 while (!list_empty(&matches)) {
fe0750e5
BF		 4403 lo = list_entry(matches.next, struct nfs4_lockowner,
4404 lo_list);
0fa822e4
N		 4405 /* unhash_stateowner deletes so_perclient only
4406 * for openowners. */
fe0750e5
BF		 4407 list_del(&lo->lo_list);
4408 release_lockowner(lo);
1da177e4
LT		 4409 }
4410out:
4411 nfs4_unlock_state();
4412 return status;
4413}
4414
4415static inline struct nfs4_client_reclaim *
a55370a3 4416alloc_reclaim(void)
1da177e4 4417{
a55370a3 4418 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 4419}
4420
c7b9a459 4421int
a1bcecd2 4422nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 4423{
4424 unsigned int strhashval = clientstr_hashval(name);
4425 struct nfs4_client *clp;
4426
e203d506 4427 clp = find_confirmed_client_by_str(name, strhashval);
393d8ed8
BF		 4428 if (!clp)
4429 return 0;
a52d726b 4430 return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
c7b9a459
N		 4431}
4432
1da177e4
LT		 4433/*
4434 * failure => all reset bets are off, nfserr_no_grace...
4435 */
190e4fbf
N		 4436int
4437nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 4438{
4439 unsigned int strhashval;
4440 struct nfs4_client_reclaim *crp = NULL;
4441
a55370a3
N		 4442 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4443 crp = alloc_reclaim();
1da177e4
LT		 4444 if (!crp)
4445 return 0;
a55370a3 4446 strhashval = clientstr_hashval(name);
1da177e4
LT		 4447 INIT_LIST_HEAD(&crp->cr_strhash);
4448 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 4449 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 4450 reclaim_str_hashtbl_size++;
4451 return 1;
4452}
4453
2a4317c5 4454void
1da177e4
LT		 4455nfs4_release_reclaim(void)
4456{
4457 struct nfs4_client_reclaim *crp = NULL;
4458 int i;
4459
1da177e4
LT		 4460 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4461 while (!list_empty(&reclaim_str_hashtbl[i])) {
4462 crp = list_entry(reclaim_str_hashtbl[i].next,
4463 struct nfs4_client_reclaim, cr_strhash);
4464 list_del(&crp->cr_strhash);
1da177e4
LT		 4465 kfree(crp);
4466 reclaim_str_hashtbl_size--;
4467 }
4468 }
4469 BUG_ON(reclaim_str_hashtbl_size);
4470}
4471
4472/*
4473 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
2a4317c5 4474struct nfs4_client_reclaim *
a52d726b 4475nfsd4_find_reclaim_client(struct nfs4_client *clp)
1da177e4
LT		 4476{
4477 unsigned int strhashval;
1da177e4
LT		 4478 struct nfs4_client_reclaim *crp = NULL;
4479
a55370a3
N		 4480 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4481 clp->cl_name.len, clp->cl_name.data,
4482 clp->cl_recdir);
1da177e4
LT		 4483
4484 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 4485 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 4486 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 4487 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 4488 return crp;
4489 }
4490 }
4491 return NULL;
4492}
4493
4494/*
4495* Called from OPEN. Look for clientid in reclaim list.
4496*/
b37ad28b 4497__be32
1da177e4
LT		 4498nfs4_check_open_reclaim(clientid_t *clid)
4499{
a52d726b
JL		 4500 struct nfs4_client *clp;
4501
4502 /* find clientid in conf_id_hashtbl */
4503 clp = find_confirmed_client(clid);
4504 if (clp == NULL)
4505 return nfserr_reclaim_bad;
4506
4507 return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
1da177e4
LT		 4508}
4509
65178db4
BS		 4510#ifdef CONFIG_NFSD_FAULT_INJECTION
4511
4512void nfsd_forget_clients(u64 num)
4513{
4514 struct nfs4_client *clp, *next;
4515 int count = 0;
4516
4517 nfs4_lock_state();
4518 list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
2a4317c5 4519 nfsd4_client_record_remove(clp);
65178db4
BS		 4520 expire_client(clp);
4521 if (++count == num)
4522 break;
4523 }
4524 nfs4_unlock_state();
4525
4526 printk(KERN_INFO "NFSD: Forgot %d clients", count);
4527}
4528
4529static void release_lockowner_sop(struct nfs4_stateowner *sop)
4530{
4531 release_lockowner(lockowner(sop));
4532}
4533
4534static void release_openowner_sop(struct nfs4_stateowner *sop)
4535{
4536 release_openowner(openowner(sop));
4537}
4538
353de31b 4539static int nfsd_release_n_owners(u64 num, bool is_open_owner,
65178db4
BS		 4540 void (*release_sop)(struct nfs4_stateowner *))
4541{
4542 int i, count = 0;
4543 struct nfs4_stateowner *sop, *next;
4544
16bfdaaf
BF		 4545 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4546 list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) {
4547 if (sop->so_is_open_owner != is_open_owner)
4548 continue;
65178db4
BS		 4549 release_sop(sop);
4550 if (++count == num)
4551 return count;
4552 }
4553 }
4554 return count;
4555}
4556
4557void nfsd_forget_locks(u64 num)
4558{
4559 int count;
4560
4561 nfs4_lock_state();
16bfdaaf 4562 count = nfsd_release_n_owners(num, false, release_lockowner_sop);
65178db4
BS		 4563 nfs4_unlock_state();
4564
4565 printk(KERN_INFO "NFSD: Forgot %d locks", count);
4566}
4567
4568void nfsd_forget_openowners(u64 num)
4569{
4570 int count;
4571
4572 nfs4_lock_state();
16bfdaaf 4573 count = nfsd_release_n_owners(num, true, release_openowner_sop);
65178db4
BS		 4574 nfs4_unlock_state();
4575
4576 printk(KERN_INFO "NFSD: Forgot %d open owners", count);
4577}
4578
a6d88f29 4579int nfsd_process_n_delegations(u64 num, struct list_head *list)
65178db4
BS		 4580{
4581 int i, count = 0;
2d3475c0
BS		 4582 struct nfs4_file *fp, *fnext;
4583 struct nfs4_delegation *dp, *dnext;
65178db4
BS		 4584
4585 for (i = 0; i < FILE_HASH_SIZE; i++) {
2d3475c0
BS		 4586 list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
4587 list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
a6d88f29 4588 list_move(&dp->dl_recall_lru, list);
65178db4
BS		 4589 if (++count == num)
4590 return count;
4591 }
4592 }
4593 }
2d3475c0 4594
65178db4
BS		 4595 return count;
4596}
4597
4598void nfsd_forget_delegations(u64 num)
4599{
4600 unsigned int count;
a6d88f29
SK		 4601 LIST_HEAD(victims);
4602 struct nfs4_delegation *dp, *dnext;
4603
4604 spin_lock(&recall_lock);
4605 count = nfsd_process_n_delegations(num, &victims);
4606 spin_unlock(&recall_lock);
65178db4
BS		 4607
4608 nfs4_lock_state();
a6d88f29
SK		 4609 list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru)
4610 unhash_delegation(dp);
65178db4
BS		 4611 nfs4_unlock_state();
4612
4613 printk(KERN_INFO "NFSD: Forgot %d delegations", count);
4614}
4615
4616void nfsd_recall_delegations(u64 num)
4617{
4618 unsigned int count;
a6d88f29
SK		 4619 LIST_HEAD(victims);
4620 struct nfs4_delegation *dp, *dnext;
65178db4 4621
65178db4 4622 spin_lock(&recall_lock);
a6d88f29
SK		 4623 count = nfsd_process_n_delegations(num, &victims);
4624 list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru) {
4625 list_del(&dp->dl_recall_lru);
4626 nfsd_break_one_deleg(dp);
4627 }
65178db4 4628 spin_unlock(&recall_lock);
65178db4
BS		 4629
4630 printk(KERN_INFO "NFSD: Recalled %d delegations", count);
4631}
4632
4633#endif /* CONFIG_NFSD_FAULT_INJECTION */
4634
ac4d8ff2 4635/* initialization to perform at module load time: */
1da177e4 4636
72083396 4637void
ac4d8ff2 4638nfs4_state_init(void)
1da177e4 4639{
72083396 4640 int i;
1da177e4 4641
1da177e4
LT		 4642 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4643 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4644 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4645 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4646 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
02cb2858 4647 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
1da177e4 4648 }
5282fd72
ME		 4649 for (i = 0; i < SESSION_HASH_SIZE; i++)
4650 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 4651 for (i = 0; i < FILE_HASH_SIZE; i++) {
4652 INIT_LIST_HEAD(&file_hashtbl[i]);
4653 }
16bfdaaf
BF		 4654 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4655 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
1da177e4 4656 }
009673b4
BF		 4657 for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4658 INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
1da177e4
LT		 4659 INIT_LIST_HEAD(&close_lru);
4660 INIT_LIST_HEAD(&client_lru);
4661 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2 4662 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 4663}
4664
c2f1a551
MS		 4665/*
4666 * Since the lifetime of a delegation isn't limited to that of an open, a
4667 * client may quite reasonably hang on to a delegation as long as it has
4668 * the inode cached. This becomes an obvious problem the first time a
4669 * client's inode cache approaches the size of the server's total memory.
4670 *
4671 * For now we avoid this problem by imposing a hard limit on the number
4672 * of delegations, which varies according to the server's memory size.
4673 */
4674static void
4675set_max_delegations(void)
4676{
4677 /*
4678 * Allow at most 4 delegations per megabyte of RAM. Quick
4679 * estimates suggest that in the worst case (where every delegation
4680 * is for a different inode), a delegation could take about 1.5K,
4681 * giving a worst case usage of about 6% of memory.
4682 */
4683 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4684}
4685
ac4d8ff2
N		 4686/* initialization to perform when the nfsd service is started: */
4687
a6d6b781
JL		 4688int
4689nfs4_state_start(void)
ac4d8ff2 4690{
b5a1a81e
BF		 4691 int ret;
4692
2a4317c5
JL		 4693 /*
4694 * FIXME: For now, we hang most of the pernet global stuff off of
4695 * init_net until nfsd is fully containerized. Eventually, we'll
4696 * need to pass a net pointer into this function, take a reference
4697 * to that instead and then do most of the rest of this on a per-net
4698 * basis.
4699 */
4700 get_net(&init_net);
4701 nfsd4_client_tracking_init(&init_net);
1da177e4 4702 boot_time = get_seconds();
af558e33 4703 locks_start_grace(&nfsd4_manager);
33dcc481 4704 grace_ended = false;
9a8db97e 4705 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
e46b498c 4706 nfsd4_grace);
b5a1a81e 4707 ret = set_callback_cred();
a6d6b781
JL		 4708 if (ret) {
4709 ret = -ENOMEM;
4710 goto out_recovery;
4711 }
58da282b 4712 laundry_wq = create_singlethread_workqueue("nfsd4");
a6d6b781
JL		 4713 if (laundry_wq == NULL) {
4714 ret = -ENOMEM;
4715 goto out_recovery;
4716 }
b5a1a81e
BF		 4717 ret = nfsd4_create_callback_queue();
4718 if (ret)
4719 goto out_free_laundry;
e46b498c 4720 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
c2f1a551 4721 set_max_delegations();
b5a1a81e
BF		 4722 return 0;
4723out_free_laundry:
4724 destroy_workqueue(laundry_wq);
a6d6b781 4725out_recovery:
2a4317c5
JL		 4726 nfsd4_client_tracking_exit(&init_net);
4727 put_net(&init_net);
b5a1a81e 4728 return ret;
1da177e4
LT		 4729}
4730
1da177e4
LT		 4731static void
4732__nfs4_state_shutdown(void)
4733{
4734 int i;
4735 struct nfs4_client *clp = NULL;
4736 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 4737 struct list_head *pos, *next, reaplist;
4738
1da177e4
LT		 4739 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4740 while (!list_empty(&conf_id_hashtbl[i])) {
4741 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4742 expire_client(clp);
4743 }
4744 while (!list_empty(&unconf_str_hashtbl[i])) {
4745 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4746 expire_client(clp);
4747 }
4748 }
4749 INIT_LIST_HEAD(&reaplist);
4750 spin_lock(&recall_lock);
4751 list_for_each_safe(pos, next, &del_recall_lru) {
4752 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4753 list_move(&dp->dl_recall_lru, &reaplist);
4754 }
4755 spin_unlock(&recall_lock);
4756 list_for_each_safe(pos, next, &reaplist) {
4757 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1da177e4
LT		 4758 unhash_delegation(dp);
4759 }
4760
2a4317c5
JL		 4761 nfsd4_client_tracking_exit(&init_net);
4762 put_net(&init_net);
1da177e4
LT		 4763}
4764
4765void
4766nfs4_state_shutdown(void)
4767{
afe2c511 4768 cancel_delayed_work_sync(&laundromat_work);
5e8d5c29 4769 destroy_workqueue(laundry_wq);
2c5e7615 4770 locks_end_grace(&nfsd4_manager);
1da177e4 4771 nfs4_lock_state();
1da177e4 4772 __nfs4_state_shutdown();
1da177e4 4773 nfs4_unlock_state();
c3935e30 4774 nfsd4_destroy_callback_queue();
1da177e4 4775}
8b70484c
TM		 4776
4777static void
4778get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4779{
37c593c5
TM		 4780 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4781 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8b70484c
TM		 4782}
4783
4784static void
4785put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4786{
37c593c5
TM		 4787 if (cstate->minorversion) {
4788 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4789 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4790 }
4791}
4792
4793void
4794clear_current_stateid(struct nfsd4_compound_state *cstate)
4795{
4796 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
8b70484c
TM		 4797}
4798
62cd4a59
TM		 4799/*
4800 * functions to set current state id
4801 */
9428fe1a
TM		 4802void
4803nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4804{
4805 put_stateid(cstate, &odp->od_stateid);
4806}
4807
8b70484c
TM		 4808void
4809nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4810{
4811 put_stateid(cstate, &open->op_stateid);
4812}
4813
62cd4a59
TM		 4814void
4815nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4816{
4817 put_stateid(cstate, &close->cl_stateid);
4818}
4819
4820void
4821nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
4822{
4823 put_stateid(cstate, &lock->lk_resp_stateid);
4824}
4825
4826/*
4827 * functions to consume current state id
4828 */
1e97b519 4829
9428fe1a
TM		 4830void
4831nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4832{
4833 get_stateid(cstate, &odp->od_stateid);
4834}
4835
4836void
4837nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
4838{
4839 get_stateid(cstate, &drp->dr_stateid);
4840}
4841
1e97b519
TM		 4842void
4843nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
4844{
4845 get_stateid(cstate, &fsp->fr_stateid);
4846}
4847
4848void
4849nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
4850{
4851 get_stateid(cstate, &setattr->sa_stateid);
4852}
4853
8b70484c
TM		 4854void
4855nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4856{
4857 get_stateid(cstate, &close->cl_stateid);
4858}
4859
4860void
62cd4a59 4861nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
8b70484c 4862{
62cd4a59 4863 get_stateid(cstate, &locku->lu_stateid);
8b70484c 4864}
30813e27
TM		 4865
4866void
4867nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
4868{
4869 get_stateid(cstate, &read->rd_stateid);
4870}
4871
4872void
4873nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
4874{
4875 get_stateid(cstate, &write->wr_stateid);
4876}
Linux 6.x block layer and io_uring tree(s)