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SUNRPC: Defer the auth_gss upcall when the RPC call is asynchronous
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
363168b4 58#include <linux/sunrpc/clnt.h>
1da177e4
LT		 59
60#define NFSDDBG_FACILITY NFSDDBG_PROC
61
62/* Globals */
63static time_t lease_time = 90; /* default lease time */
d99a05ad 64static time_t user_lease_time = 90;
fd39ca9a 65static time_t boot_time;
1da177e4
LT		 66static u32 current_ownerid = 1;
67static u32 current_fileid = 1;
68static u32 current_delegid = 1;
69static u32 nfs4_init;
fd39ca9a
N		 70static stateid_t zerostateid; /* bits all 0 */
71static stateid_t onestateid; /* bits all 1 */
ec6b5d7b 72static u64 current_sessionid = 1;
fd39ca9a
N		 73
74#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
75#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 76
1da177e4 77/* forward declarations */
fd39ca9a 78static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 79static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 80static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
81static void nfs4_set_recdir(char *recdir);
1da177e4 82
8b671b80
BF		 83/* Locking: */
84
85/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 86static DEFINE_MUTEX(client_mutex);
1da177e4 87
8b671b80
BF		 88/*
89 * Currently used for the del_recall_lru and file hash table. In an
90 * effort to decrease the scope of the client_mutex, this spinlock may
91 * eventually cover more:
92 */
93static DEFINE_SPINLOCK(recall_lock);
94
e18b890b
CL		 95static struct kmem_cache *stateowner_slab = NULL;
96static struct kmem_cache *file_slab = NULL;
97static struct kmem_cache *stateid_slab = NULL;
98static struct kmem_cache *deleg_slab = NULL;
e60d4398 99
1da177e4
LT		 100void
101nfs4_lock_state(void)
102{
353ab6e9 103 mutex_lock(&client_mutex);
1da177e4
LT		 104}
105
106void
107nfs4_unlock_state(void)
108{
353ab6e9 109 mutex_unlock(&client_mutex);
1da177e4
LT		 110}
111
112static inline u32
113opaque_hashval(const void *ptr, int nbytes)
114{
115 unsigned char *cptr = (unsigned char *) ptr;
116
117 u32 x = 0;
118 while (nbytes--) {
119 x *= 37;
120 x += *cptr++;
121 }
122 return x;
123}
124
1da177e4
LT		 125static struct list_head del_recall_lru;
126
13cd2184
N		 127static inline void
128put_nfs4_file(struct nfs4_file *fi)
129{
8b671b80
BF		 130 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
131 list_del(&fi->fi_hash);
132 spin_unlock(&recall_lock);
133 iput(fi->fi_inode);
134 kmem_cache_free(file_slab, fi);
135 }
13cd2184
N		 136}
137
138static inline void
139get_nfs4_file(struct nfs4_file *fi)
140{
8b671b80 141 atomic_inc(&fi->fi_ref);
13cd2184
N		 142}
143
ef0f3390 144static int num_delegations;
c2f1a551 145unsigned int max_delegations;
ef0f3390
N		 146
147/*
148 * Open owner state (share locks)
149 */
150
151/* hash tables for nfs4_stateowner */
152#define OWNER_HASH_BITS 8
153#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
154#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
155
156#define ownerid_hashval(id) \
157 ((id) & OWNER_HASH_MASK)
158#define ownerstr_hashval(clientid, ownername) \
159 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
160
161static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
162static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
163
164/* hash table for nfs4_file */
165#define FILE_HASH_BITS 8
166#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
167#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
168/* hash table for (open)nfs4_stateid */
169#define STATEID_HASH_BITS 10
170#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
171#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
172
173#define file_hashval(x) \
174 hash_ptr(x, FILE_HASH_BITS)
175#define stateid_hashval(owner_id, file_id) \
176 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
177
178static struct list_head file_hashtbl[FILE_HASH_SIZE];
179static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
180
1da177e4
LT		 181static struct nfs4_delegation *
182alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
183{
184 struct nfs4_delegation *dp;
185 struct nfs4_file *fp = stp->st_file;
c237dc03 186 struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
1da177e4
LT		 187
188 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 189 if (fp->fi_had_conflict)
190 return NULL;
c2f1a551 191 if (num_delegations > max_delegations)
ef0f3390 192 return NULL;
5b2d21c1
N		 193 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
194 if (dp == NULL)
1da177e4 195 return dp;
ef0f3390 196 num_delegations++;
ea1da636
N		 197 INIT_LIST_HEAD(&dp->dl_perfile);
198 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 199 INIT_LIST_HEAD(&dp->dl_recall_lru);
200 dp->dl_client = clp;
13cd2184 201 get_nfs4_file(fp);
1da177e4
LT		 202 dp->dl_file = fp;
203 dp->dl_flock = NULL;
204 get_file(stp->st_vfs_file);
205 dp->dl_vfs_file = stp->st_vfs_file;
206 dp->dl_type = type;
b53d40c5 207 dp->dl_ident = cb->cb_ident;
78155ed7 208 dp->dl_stateid.si_boot = get_seconds();
1da177e4
LT		 209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
6c02eaa1 212 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 213 dp->dl_time = 0;
214 atomic_set(&dp->dl_count, 1);
ea1da636
N		 215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 217 return dp;
218}
219
220void
221nfs4_put_delegation(struct nfs4_delegation *dp)
222{
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 225 put_nfs4_file(dp->dl_file);
5b2d21c1 226 kmem_cache_free(deleg_slab, dp);
ef0f3390 227 num_delegations--;
1da177e4
LT		 228 }
229}
230
231/* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
235 */
236static void
237nfs4_close_delegation(struct nfs4_delegation *dp)
238{
239 struct file *filp = dp->dl_vfs_file;
240
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
c907132d 245 if (dp->dl_flock)
a9933cea 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 247 nfsd_close(filp);
1da177e4
LT		 248}
249
250/* Called under the state lock. */
251static void
252unhash_delegation(struct nfs4_delegation *dp)
253{
ea1da636
N		 254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
261}
262
263/*
264 * SETCLIENTID state
265 */
266
267/* Hash tables for nfs4_clientid state */
268#define CLIENT_HASH_BITS 4
269#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
271
272#define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 274#define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 276/*
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
279 *
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
282 *
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
284 * setclientid info.
285 *
286 * client_lru holds client queue ordered by nfs4_client.cl_time
287 * for lease renewal.
288 *
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
291 */
292static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293static int reclaim_str_hashtbl_size = 0;
294static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head client_lru;
299static struct list_head close_lru;
300
2283963f
BF		 301static void unhash_generic_stateid(struct nfs4_stateid *stp)
302{
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
306}
307
308static void free_generic_stateid(struct nfs4_stateid *stp)
309{
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
312}
313
314static void release_lock_stateid(struct nfs4_stateid *stp)
315{
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
319}
320
f044ff83
BF		 321static void unhash_lockowner(struct nfs4_stateowner *sop)
322{
323 struct nfs4_stateid *stp;
324
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
332 }
333}
334
335static void release_lockowner(struct nfs4_stateowner *sop)
336{
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
339}
340
f1d110ca
BF		 341static void
342release_stateid_lockowners(struct nfs4_stateid *open_stp)
343{
344 struct nfs4_stateowner *lock_sop;
345
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 351 release_lockowner(lock_sop);
f1d110ca
BF		 352 }
353}
354
2283963f
BF		 355static void release_open_stateid(struct nfs4_stateid *stp)
356{
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
361}
362
f044ff83 363static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 364{
365 struct nfs4_stateid *stp;
366
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
f044ff83
BF		 369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 371 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
f1d110ca
BF		 375 }
376}
377
f044ff83 378static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 379{
f044ff83 380 unhash_openowner(sop);
f1d110ca
BF		 381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
383}
384
5282fd72
ME		 385static DEFINE_SPINLOCK(sessionid_lock);
386#define SESSION_HASH_SIZE 512
387static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
388
389static inline int
390hash_sessionid(struct nfs4_sessionid *sessionid)
391{
392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
393
394 return sid->sequence % SESSION_HASH_SIZE;
395}
396
397static inline void
398dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
399{
400 u32 *ptr = (u32 *)(&sessionid->data[0]);
401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
402}
403
ec6b5d7b
AA		 404static void
405gen_sessionid(struct nfsd4_session *ses)
406{
407 struct nfs4_client *clp = ses->se_client;
408 struct nfsd4_sessionid *sid;
409
410 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
411 sid->clientid = clp->cl_clientid;
412 sid->sequence = current_sessionid++;
413 sid->reserved = 0;
414}
415
416/*
a649637c
AA		 417 * The protocol defines ca_maxresponssize_cached to include the size of
418 * the rpc header, but all we need to cache is the data starting after
419 * the end of the initial SEQUENCE operation--the rest we regenerate
420 * each time. Therefore we can advertise a ca_maxresponssize_cached
421 * value that is the number of bytes in our cache plus a few additional
422 * bytes. In order to stay on the safe side, and not promise more than
423 * we can cache, those additional bytes must be the minimum possible: 24
424 * bytes of rpc header (xid through accept state, with AUTH_NULL
425 * verifier), 12 for the compound header (with zero-length tag), and 44
426 * for the SEQUENCE op response:
427 */
428#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
429
430/*
431 * Give the client the number of ca_maxresponsesize_cached slots it
432 * requests, of size bounded by NFSD_SLOT_CACHE_SIZE,
433 * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more
434 * than NFSD_MAX_SLOTS_PER_SESSION.
ec6b5d7b 435 *
a649637c
AA		 436 * If we run out of reserved DRC memory we should (up to a point)
437 * re-negotiate active sessions and reduce their slot usage to make
438 * rooom for new connections. For now we just fail the create session.
ec6b5d7b 439 */
a649637c 440static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan)
ec6b5d7b 441{
a649637c 442 int mem, size = fchan->maxresp_cached;
ec6b5d7b 443
5d77ddfb
AA		 444 if (fchan->maxreqs < 1)
445 return nfserr_inval;
5d77ddfb 446
a649637c
AA		 447 if (size < NFSD_MIN_HDR_SEQ_SZ)
448 size = NFSD_MIN_HDR_SEQ_SZ;
449 size -= NFSD_MIN_HDR_SEQ_SZ;
450 if (size > NFSD_SLOT_CACHE_SIZE)
451 size = NFSD_SLOT_CACHE_SIZE;
452
453 /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */
454 mem = fchan->maxreqs * size;
455 if (mem > NFSD_MAX_MEM_PER_SESSION) {
456 fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size;
457 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
458 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
459 mem = fchan->maxreqs * size;
460 }
b101ebbc 461
4bd9b0f4 462 spin_lock(&nfsd_drc_lock);
a649637c
AA		 463 /* bound the total session drc memory ussage */
464 if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) {
465 fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size;
466 mem = fchan->maxreqs * size;
467 }
0c193054 468 nfsd_drc_mem_used += mem;
4bd9b0f4 469 spin_unlock(&nfsd_drc_lock);
ec6b5d7b 470
b101ebbc 471 if (fchan->maxreqs == 0)
bdac86e2 472 return nfserr_serverfault;
a649637c
AA		 473
474 fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ;
b101ebbc 475 return 0;
ec6b5d7b
AA		 476}
477
478/*
479 * fchan holds the client values on input, and the server values on output
480 */
481static int init_forechannel_attrs(struct svc_rqst *rqstp,
6c18ba9f
AB		 482 struct nfsd4_channel_attrs *session_fchan,
483 struct nfsd4_channel_attrs *fchan)
ec6b5d7b
AA		 484{
485 int status = 0;
486 __u32 maxcount = svc_max_payload(rqstp);
487
488 /* headerpadsz set to zero in encode routine */
489
490 /* Use the client's max request and max response size if possible */
491 if (fchan->maxreq_sz > maxcount)
492 fchan->maxreq_sz = maxcount;
6c18ba9f 493 session_fchan->maxreq_sz = fchan->maxreq_sz;
ec6b5d7b
AA		 494
495 if (fchan->maxresp_sz > maxcount)
496 fchan->maxresp_sz = maxcount;
6c18ba9f 497 session_fchan->maxresp_sz = fchan->maxresp_sz;
ec6b5d7b 498
ec6b5d7b
AA		 499 /* Use the client's maxops if possible */
500 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
501 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
6c18ba9f 502 session_fchan->maxops = fchan->maxops;
ec6b5d7b 503
ec6b5d7b
AA		 504 /* FIXME: Error means no more DRC pages so the server should
505 * recover pages from existing sessions. For now fail session
506 * creation.
507 */
a649637c 508 status = set_forechannel_drc_size(fchan);
ec6b5d7b 509
a649637c 510 session_fchan->maxresp_cached = fchan->maxresp_cached;
6c18ba9f 511 session_fchan->maxreqs = fchan->maxreqs;
a649637c
AA		 512
513 dprintk("%s status %d\n", __func__, status);
ec6b5d7b
AA		 514 return status;
515}
516
557ce264
AA		 517static void
518free_session_slots(struct nfsd4_session *ses)
519{
520 int i;
521
522 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
523 kfree(ses->se_slots[i]);
524}
525
ec6b5d7b
AA		 526static int
527alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
528 struct nfsd4_create_session *cses)
529{
530 struct nfsd4_session *new, tmp;
557ce264
AA		 531 struct nfsd4_slot *sp;
532 int idx, slotsize, cachesize, i;
533 int status;
ec6b5d7b
AA		 534
535 memset(&tmp, 0, sizeof(tmp));
536
537 /* FIXME: For now, we just accept the client back channel attributes. */
6c18ba9f
AB		 538 tmp.se_bchannel = cses->back_channel;
539 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel,
540 &cses->fore_channel);
ec6b5d7b
AA		 541 if (status)
542 goto out;
543
557ce264
AA		 544 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot)
545 + sizeof(struct nfsd4_session) > PAGE_SIZE);
546
547 status = nfserr_serverfault;
548 /* allocate struct nfsd4_session and slot table pointers in one piece */
549 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *);
ec6b5d7b
AA		 550 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
551 if (!new)
552 goto out;
553
554 memcpy(new, &tmp, sizeof(*new));
555
557ce264
AA		 556 /* allocate each struct nfsd4_slot and data cache in one piece */
557 cachesize = new->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
558 for (i = 0; i < new->se_fchannel.maxreqs; i++) {
559 sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL);
560 if (!sp)
561 goto out_free;
562 new->se_slots[i] = sp;
563 }
564
ec6b5d7b
AA		 565 new->se_client = clp;
566 gen_sessionid(new);
567 idx = hash_sessionid(&new->se_sessionid);
568 memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
569 NFS4_MAX_SESSIONID_LEN);
570
571 new->se_flags = cses->flags;
572 kref_init(&new->se_ref);
573 spin_lock(&sessionid_lock);
574 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
575 list_add(&new->se_perclnt, &clp->cl_sessions);
576 spin_unlock(&sessionid_lock);
577
578 status = nfs_ok;
579out:
580 return status;
557ce264
AA		 581out_free:
582 free_session_slots(new);
583 kfree(new);
584 goto out;
ec6b5d7b
AA		 585}
586
5282fd72
ME		 587/* caller must hold sessionid_lock */
588static struct nfsd4_session *
589find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
590{
591 struct nfsd4_session *elem;
592 int idx;
593
594 dump_sessionid(__func__, sessionid);
595 idx = hash_sessionid(sessionid);
596 dprintk("%s: idx is %d\n", __func__, idx);
597 /* Search in the appropriate list */
598 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
599 dump_sessionid("list traversal", &elem->se_sessionid);
600 if (!memcmp(elem->se_sessionid.data, sessionid->data,
601 NFS4_MAX_SESSIONID_LEN)) {
602 return elem;
603 }
604 }
605
606 dprintk("%s: session not found\n", __func__);
607 return NULL;
608}
609
610/* caller must hold sessionid_lock */
7116ed6b 611static void
5282fd72 612unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 613{
614 list_del(&ses->se_hash);
615 list_del(&ses->se_perclnt);
5282fd72
ME		 616}
617
618static void
619release_session(struct nfsd4_session *ses)
620{
621 spin_lock(&sessionid_lock);
622 unhash_session(ses);
623 spin_unlock(&sessionid_lock);
7116ed6b
AA		 624 nfsd4_put_session(ses);
625}
626
627void
628free_session(struct kref *kref)
629{
630 struct nfsd4_session *ses;
631
632 ses = container_of(kref, struct nfsd4_session, se_ref);
be98d1bb 633 spin_lock(&nfsd_drc_lock);
0c193054 634 nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
be98d1bb 635 spin_unlock(&nfsd_drc_lock);
557ce264 636 free_session_slots(ses);
7116ed6b
AA		 637 kfree(ses);
638}
639
1da177e4
LT		 640static inline void
641renew_client(struct nfs4_client *clp)
642{
643 /*
644 * Move client to the end to the LRU list.
645 */
646 dprintk("renewing client (clientid %08x/%08x)\n",
647 clp->cl_clientid.cl_boot,
648 clp->cl_clientid.cl_id);
649 list_move_tail(&clp->cl_lru, &client_lru);
650 clp->cl_time = get_seconds();
651}
652
653/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
654static int
655STALE_CLIENTID(clientid_t *clid)
656{
657 if (clid->cl_boot == boot_time)
658 return 0;
60adfc50
AA		 659 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
660 clid->cl_boot, clid->cl_id, boot_time);
1da177e4
LT		 661 return 1;
662}
663
664/*
665 * XXX Should we use a slab cache ?
666 * This type of memory management is somewhat inefficient, but we use it
667 * anyway since SETCLIENTID is not a common operation.
668 */
35bba9a3 669static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 670{
671 struct nfs4_client *clp;
672
35bba9a3
BF		 673 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
674 if (clp == NULL)
675 return NULL;
676 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
677 if (clp->cl_name.data == NULL) {
678 kfree(clp);
679 return NULL;
1da177e4 680 }
35bba9a3
BF		 681 memcpy(clp->cl_name.data, name.data, name.len);
682 clp->cl_name.len = name.len;
1da177e4
LT		 683 return clp;
684}
685
1b1a9b31
BF		 686static void
687shutdown_callback_client(struct nfs4_client *clp)
688{
c237dc03 689 struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
1b1a9b31 690
1b1a9b31 691 if (clnt) {
404ec117
BF		 692 /*
693 * Callback threads take a reference on the client, so there
694 * should be no outstanding callbacks at this point.
695 */
c237dc03 696 clp->cl_cb_conn.cb_client = NULL;
1b1a9b31
BF		 697 rpc_shutdown_client(clnt);
698 }
c237dc03
BF		 699 if (clp->cl_cb_conn.cb_cred) {
700 put_rpccred(clp->cl_cb_conn.cb_cred);
701 clp->cl_cb_conn.cb_cred = NULL;
3cef9ab2 702 }
1b1a9b31
BF		 703}
704
1da177e4
LT		 705static inline void
706free_client(struct nfs4_client *clp)
707{
1b1a9b31 708 shutdown_callback_client(clp);
1da177e4
LT		 709 if (clp->cl_cred.cr_group_info)
710 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 711 kfree(clp->cl_principal);
1da177e4
LT		 712 kfree(clp->cl_name.data);
713 kfree(clp);
714}
715
716void
717put_nfs4_client(struct nfs4_client *clp)
718{
719 if (atomic_dec_and_test(&clp->cl_count))
720 free_client(clp);
721}
722
723static void
724expire_client(struct nfs4_client *clp)
725{
726 struct nfs4_stateowner *sop;
727 struct nfs4_delegation *dp;
1da177e4
LT		 728 struct list_head reaplist;
729
730 dprintk("NFSD: expire_client cl_count %d\n",
731 atomic_read(&clp->cl_count));
732
1da177e4
LT		 733 INIT_LIST_HEAD(&reaplist);
734 spin_lock(&recall_lock);
ea1da636
N		 735 while (!list_empty(&clp->cl_delegations)) {
736 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 737 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
738 dp->dl_flock);
ea1da636 739 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 740 list_move(&dp->dl_recall_lru, &reaplist);
741 }
742 spin_unlock(&recall_lock);
743 while (!list_empty(&reaplist)) {
744 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
745 list_del_init(&dp->dl_recall_lru);
746 unhash_delegation(dp);
747 }
748 list_del(&clp->cl_idhash);
749 list_del(&clp->cl_strhash);
750 list_del(&clp->cl_lru);
ea1da636
N		 751 while (!list_empty(&clp->cl_openowners)) {
752 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 753 release_openowner(sop);
1da177e4 754 }
c4bf7868
ME		 755 while (!list_empty(&clp->cl_sessions)) {
756 struct nfsd4_session *ses;
757 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
758 se_perclnt);
759 release_session(ses);
760 }
1da177e4
LT		 761 put_nfs4_client(clp);
762}
763
35bba9a3
BF		 764static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
765{
1da177e4
LT		 766 struct nfs4_client *clp;
767
35bba9a3
BF		 768 clp = alloc_client(name);
769 if (clp == NULL)
770 return NULL;
a55370a3 771 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4 772 atomic_set(&clp->cl_count, 1);
c237dc03 773 atomic_set(&clp->cl_cb_conn.cb_set, 0);
1da177e4
LT		 774 INIT_LIST_HEAD(&clp->cl_idhash);
775 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 776 INIT_LIST_HEAD(&clp->cl_openowners);
777 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 778 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 779 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 780 return clp;
781}
782
35bba9a3
BF		 783static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
784{
785 memcpy(target->cl_verifier.data, source->data,
786 sizeof(target->cl_verifier.data));
1da177e4
LT		 787}
788
35bba9a3
BF		 789static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
790{
1da177e4
LT		 791 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
792 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
793}
794
35bba9a3
BF		 795static void copy_cred(struct svc_cred *target, struct svc_cred *source)
796{
1da177e4
LT		 797 target->cr_uid = source->cr_uid;
798 target->cr_gid = source->cr_gid;
799 target->cr_group_info = source->cr_group_info;
800 get_group_info(target->cr_group_info);
801}
802
35bba9a3 803static int same_name(const char *n1, const char *n2)
599e0a22 804{
a55370a3 805 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 806}
807
808static int
599e0a22
BF		 809same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
810{
811 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 812}
813
814static int
599e0a22
BF		 815same_clid(clientid_t *cl1, clientid_t *cl2)
816{
817 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 818}
819
820/* XXX what about NGROUP */
821static int
599e0a22
BF		 822same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
823{
824 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 825}
826
5ec7b46c
BF		 827static void gen_clid(struct nfs4_client *clp)
828{
829 static u32 current_clientid = 1;
830
1da177e4
LT		 831 clp->cl_clientid.cl_boot = boot_time;
832 clp->cl_clientid.cl_id = current_clientid++;
833}
834
deda2faa
BF		 835static void gen_confirm(struct nfs4_client *clp)
836{
837 static u32 i;
838 u32 *p;
1da177e4 839
1da177e4 840 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 841 *p++ = get_seconds();
842 *p++ = i++;
1da177e4
LT		 843}
844
35bba9a3
BF		 845static int check_name(struct xdr_netobj name)
846{
1da177e4
LT		 847 if (name.len == 0)
848 return 0;
849 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 850 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 851 return 0;
852 }
853 return 1;
854}
855
fd39ca9a 856static void
1da177e4
LT		 857add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
858{
859 unsigned int idhashval;
860
861 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
862 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
863 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
864 list_add_tail(&clp->cl_lru, &client_lru);
865 clp->cl_time = get_seconds();
866}
867
fd39ca9a 868static void
1da177e4
LT		 869move_to_confirmed(struct nfs4_client *clp)
870{
871 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
872 unsigned int strhashval;
873
874 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
875 list_del_init(&clp->cl_strhash);
f116629d 876 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 877 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 878 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
879 renew_client(clp);
880}
881
882static struct nfs4_client *
883find_confirmed_client(clientid_t *clid)
884{
885 struct nfs4_client *clp;
886 unsigned int idhashval = clientid_hashval(clid->cl_id);
887
888 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 889 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 890 return clp;
891 }
892 return NULL;
893}
894
895static struct nfs4_client *
896find_unconfirmed_client(clientid_t *clid)
897{
898 struct nfs4_client *clp;
899 unsigned int idhashval = clientid_hashval(clid->cl_id);
900
901 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 902 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 903 return clp;
904 }
905 return NULL;
906}
907
a1bcecd2
AA		 908/*
909 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
910 * parameter. Matching is based on the fact the at least one of the
911 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
912 *
913 * FIXME: we need to unify the clientid namespaces for nfsv4.x
914 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
915 * and SET_CLIENTID{,_CONFIRM}
916 */
917static inline int
918match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
919{
920 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
921 return use_exchange_id == has_exchange_flags;
922}
923
28ce6054 924static struct nfs4_client *
a1bcecd2
AA		 925find_confirmed_client_by_str(const char *dname, unsigned int hashval,
926 bool use_exchange_id)
28ce6054
N		 927{
928 struct nfs4_client *clp;
929
930 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 931 if (same_name(clp->cl_recdir, dname) &&
932 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 933 return clp;
934 }
935 return NULL;
936}
937
938static struct nfs4_client *
a1bcecd2
AA		 939find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
940 bool use_exchange_id)
28ce6054
N		 941{
942 struct nfs4_client *clp;
943
944 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 945 if (same_name(clp->cl_recdir, dname) &&
946 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 947 return clp;
948 }
949 return NULL;
950}
951
fd39ca9a 952static void
fbf4665f 953gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid)
1da177e4 954{
c237dc03 955 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
7077ecba
JL		 956 unsigned short expected_family;
957
958 /* Currently, we only support tcp and tcp6 for the callback channel */
959 if (se->se_callback_netid_len == 3 &&
960 !memcmp(se->se_callback_netid_val, "tcp", 3))
961 expected_family = AF_INET;
962 else if (se->se_callback_netid_len == 4 &&
963 !memcmp(se->se_callback_netid_val, "tcp6", 4))
964 expected_family = AF_INET6;
965 else
1da177e4
LT		 966 goto out_err;
967
aa9a4ec7
JL		 968 cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
969 se->se_callback_addr_len,
970 (struct sockaddr *) &cb->cb_addr,
971 sizeof(cb->cb_addr));
972
7077ecba 973 if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family)
1da177e4 974 goto out_err;
aa9a4ec7 975
fbf4665f
JL		 976 if (cb->cb_addr.ss_family == AF_INET6)
977 ((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid;
978
ab52ae6d 979 cb->cb_minorversion = 0;
1da177e4
LT		 980 cb->cb_prog = se->se_callback_prog;
981 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 982 return;
983out_err:
aa9a4ec7
JL		 984 cb->cb_addr.ss_family = AF_UNSPEC;
985 cb->cb_addrlen = 0;
849823c5 986 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 987 "will not receive delegations\n",
988 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
989
1da177e4
LT		 990 return;
991}
992
074fe897 993/*
557ce264 994 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
074fe897
AA		 995 */
996void
997nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
998{
557ce264
AA		 999 struct nfsd4_slot *slot = resp->cstate.slot;
1000 unsigned int base;
074fe897 1001
557ce264 1002 dprintk("--> %s slot %p\n", __func__, slot);
074fe897 1003
557ce264
AA		 1004 slot->sl_opcnt = resp->opcnt;
1005 slot->sl_status = resp->cstate.status;
bf864a31
AA		 1006
1007 if (nfsd4_not_cached(resp)) {
557ce264 1008 slot->sl_datalen = 0;
bf864a31
AA		 1009 return;
1010 }
557ce264
AA		 1011 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1012 base = (char *)resp->cstate.datap -
1013 (char *)resp->xbuf->head[0].iov_base;
1014 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1015 slot->sl_datalen))
1016 WARN("%s: sessions DRC could not cache compound\n", __func__);
1017 return;
074fe897
AA		 1018}
1019
abfabf8c
AA		 1020/*
1021 * Encode the replay sequence operation from the slot values.
1022 * If cachethis is FALSE encode the uncached rep error on the next
1023 * operation which sets resp->p and increments resp->opcnt for
1024 * nfs4svc_encode_compoundres.
1025 *
1026 */
1027static __be32
1028nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1029 struct nfsd4_compoundres *resp)
1030{
1031 struct nfsd4_op *op;
1032 struct nfsd4_slot *slot = resp->cstate.slot;
1033
1034 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
557ce264 1035 resp->opcnt, resp->cstate.slot->sl_cachethis);
abfabf8c
AA		 1036
1037 /* Encode the replayed sequence operation */
1038 op = &args->ops[resp->opcnt - 1];
1039 nfsd4_encode_operation(resp, op);
1040
1041 /* Return nfserr_retry_uncached_rep in next operation. */
557ce264 1042 if (args->opcnt > 1 && slot->sl_cachethis == 0) {
abfabf8c
AA		 1043 op = &args->ops[resp->opcnt++];
1044 op->status = nfserr_retry_uncached_rep;
1045 nfsd4_encode_operation(resp, op);
1046 }
1047 return op->status;
1048}
1049
074fe897 1050/*
557ce264
AA		 1051 * The sequence operation is not cached because we can use the slot and
1052 * session values.
074fe897
AA		 1053 */
1054__be32
bf864a31
AA		 1055nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1056 struct nfsd4_sequence *seq)
074fe897 1057{
557ce264 1058 struct nfsd4_slot *slot = resp->cstate.slot;
074fe897
AA		 1059 __be32 status;
1060
557ce264 1061 dprintk("--> %s slot %p\n", __func__, slot);
abfabf8c
AA		 1062
1063 /* Either returns 0 or nfserr_retry_uncached */
1064 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1065 if (status == nfserr_retry_uncached_rep)
1066 return status;
074fe897 1067
557ce264
AA		 1068 /* The sequence operation has been encoded, cstate->datap set. */
1069 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
074fe897 1070
557ce264
AA		 1071 resp->opcnt = slot->sl_opcnt;
1072 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1073 status = slot->sl_status;
074fe897
AA		 1074
1075 return status;
1076}
1077
0733d213
AA		 1078/*
1079 * Set the exchange_id flags returned by the server.
1080 */
1081static void
1082nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1083{
1084 /* pNFS is not supported */
1085 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1086
1087 /* Referrals are supported, Migration is not. */
1088 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1089
1090 /* set the wire flags to return to client. */
1091 clid->flags = new->cl_exchange_flags;
1092}
1093
069b6ad4
AA		 1094__be32
1095nfsd4_exchange_id(struct svc_rqst *rqstp,
1096 struct nfsd4_compound_state *cstate,
1097 struct nfsd4_exchange_id *exid)
1098{
0733d213
AA		 1099 struct nfs4_client *unconf, *conf, *new;
1100 int status;
1101 unsigned int strhashval;
1102 char dname[HEXDIR_LEN];
363168b4 1103 char addr_str[INET6_ADDRSTRLEN];
0733d213 1104 nfs4_verifier verf = exid->verifier;
363168b4 1105 struct sockaddr *sa = svc_addr(rqstp);
0733d213 1106
363168b4 1107 rpc_ntop(sa, addr_str, sizeof(addr_str));
0733d213 1108 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
363168b4 1109 "ip_addr=%s flags %x, spa_how %d\n",
0733d213 1110 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
363168b4 1111 addr_str, exid->flags, exid->spa_how);
0733d213
AA		 1112
1113 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1114 return nfserr_inval;
1115
1116 /* Currently only support SP4_NONE */
1117 switch (exid->spa_how) {
1118 case SP4_NONE:
1119 break;
1120 case SP4_SSV:
1121 return nfserr_encr_alg_unsupp;
1122 default:
1123 BUG(); /* checked by xdr code */
1124 case SP4_MACH_CRED:
1125 return nfserr_serverfault; /* no excuse :-/ */
1126 }
1127
1128 status = nfs4_make_rec_clidname(dname, &exid->clname);
1129
1130 if (status)
1131 goto error;
1132
1133 strhashval = clientstr_hashval(dname);
1134
1135 nfs4_lock_state();
1136 status = nfs_ok;
1137
a1bcecd2 1138 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1139 if (conf) {
1140 if (!same_verf(&verf, &conf->cl_verifier)) {
1141 /* 18.35.4 case 8 */
1142 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1143 status = nfserr_not_same;
1144 goto out;
1145 }
1146 /* Client reboot: destroy old state */
1147 expire_client(conf);
1148 goto out_new;
1149 }
1150 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1151 /* 18.35.4 case 9 */
1152 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1153 status = nfserr_perm;
1154 goto out;
1155 }
1156 expire_client(conf);
1157 goto out_new;
1158 }
0733d213
AA		 1159 /*
1160 * Set bit when the owner id and verifier map to an already
1161 * confirmed client id (18.35.3).
1162 */
1163 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1164
1165 /*
1166 * Falling into 18.35.4 case 2, possible router replay.
1167 * Leave confirmed record intact and return same result.
1168 */
1169 copy_verf(conf, &verf);
1170 new = conf;
1171 goto out_copy;
6ddbbbfe
MS		 1172 }
1173
1174 /* 18.35.4 case 7 */
1175 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1176 status = nfserr_noent;
1177 goto out;
0733d213
AA		 1178 }
1179
a1bcecd2 1180 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1181 if (unconf) {
1182 /*
1183 * Possible retry or client restart. Per 18.35.4 case 4,
1184 * a new unconfirmed record should be generated regardless
1185 * of whether any properties have changed.
1186 */
1187 expire_client(unconf);
1188 }
1189
1190out_new:
1191 /* Normal case */
1192 new = create_client(exid->clname, dname);
1193 if (new == NULL) {
bdac86e2 1194 status = nfserr_serverfault;
0733d213
AA		 1195 goto out;
1196 }
1197
1198 copy_verf(new, &verf);
1199 copy_cred(&new->cl_cred, &rqstp->rq_cred);
363168b4 1200 rpc_copy_addr((struct sockaddr *) &new->cl_addr, sa);
0733d213
AA		 1201 gen_clid(new);
1202 gen_confirm(new);
1203 add_to_unconfirmed(new, strhashval);
1204out_copy:
1205 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1206 exid->clientid.cl_id = new->cl_clientid.cl_id;
1207
38eb76a5 1208 exid->seqid = 1;
0733d213
AA		 1209 nfsd4_set_ex_flags(new, exid);
1210
1211 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
49557cc7 1212 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
0733d213
AA		 1213 status = nfs_ok;
1214
1215out:
1216 nfs4_unlock_state();
1217error:
1218 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1219 return status;
069b6ad4
AA		 1220}
1221
b85d4c01 1222static int
88e588d5 1223check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
b85d4c01 1224{
88e588d5
AA		 1225 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1226 slot_seqid);
b85d4c01
BH		 1227
1228 /* The slot is in use, and no response has been sent. */
88e588d5
AA		 1229 if (slot_inuse) {
1230 if (seqid == slot_seqid)
b85d4c01
BH		 1231 return nfserr_jukebox;
1232 else
1233 return nfserr_seq_misordered;
1234 }
1235 /* Normal */
88e588d5 1236 if (likely(seqid == slot_seqid + 1))
b85d4c01
BH		 1237 return nfs_ok;
1238 /* Replay */
88e588d5 1239 if (seqid == slot_seqid)
b85d4c01
BH		 1240 return nfserr_replay_cache;
1241 /* Wraparound */
88e588d5 1242 if (seqid == 1 && (slot_seqid + 1) == 0)
b85d4c01
BH		 1243 return nfs_ok;
1244 /* Misordered replay or misordered new request */
1245 return nfserr_seq_misordered;
1246}
1247
49557cc7
AA		 1248/*
1249 * Cache the create session result into the create session single DRC
1250 * slot cache by saving the xdr structure. sl_seqid has been set.
1251 * Do this for solo or embedded create session operations.
1252 */
1253static void
1254nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1255 struct nfsd4_clid_slot *slot, int nfserr)
1256{
1257 slot->sl_status = nfserr;
1258 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1259}
1260
1261static __be32
1262nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1263 struct nfsd4_clid_slot *slot)
1264{
1265 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1266 return slot->sl_status;
1267}
1268
069b6ad4
AA		 1269__be32
1270nfsd4_create_session(struct svc_rqst *rqstp,
1271 struct nfsd4_compound_state *cstate,
1272 struct nfsd4_create_session *cr_ses)
1273{
363168b4 1274 struct sockaddr *sa = svc_addr(rqstp);
ec6b5d7b 1275 struct nfs4_client *conf, *unconf;
49557cc7 1276 struct nfsd4_clid_slot *cs_slot = NULL;
ec6b5d7b
AA		 1277 int status = 0;
1278
1279 nfs4_lock_state();
1280 unconf = find_unconfirmed_client(&cr_ses->clientid);
1281 conf = find_confirmed_client(&cr_ses->clientid);
1282
1283 if (conf) {
49557cc7
AA		 1284 cs_slot = &conf->cl_cs_slot;
1285 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
38eb76a5 1286 if (status == nfserr_replay_cache) {
ec6b5d7b 1287 dprintk("Got a create_session replay! seqid= %d\n",
49557cc7 1288 cs_slot->sl_seqid);
38eb76a5 1289 /* Return the cached reply status */
49557cc7 1290 status = nfsd4_replay_create_session(cr_ses, cs_slot);
38eb76a5 1291 goto out;
49557cc7 1292 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
ec6b5d7b
AA		 1293 status = nfserr_seq_misordered;
1294 dprintk("Sequence misordered!\n");
1295 dprintk("Expected seqid= %d but got seqid= %d\n",
49557cc7 1296 cs_slot->sl_seqid, cr_ses->seqid);
ec6b5d7b
AA		 1297 goto out;
1298 }
49557cc7 1299 cs_slot->sl_seqid++;
ec6b5d7b
AA		 1300 } else if (unconf) {
1301 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
363168b4 1302 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
ec6b5d7b
AA		 1303 status = nfserr_clid_inuse;
1304 goto out;
1305 }
1306
49557cc7
AA		 1307 cs_slot = &unconf->cl_cs_slot;
1308 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
38eb76a5
AA		 1309 if (status) {
1310 /* an unconfirmed replay returns misordered */
ec6b5d7b 1311 status = nfserr_seq_misordered;
49557cc7 1312 goto out_cache;
ec6b5d7b
AA		 1313 }
1314
49557cc7 1315 cs_slot->sl_seqid++; /* from 0 to 1 */
ec6b5d7b
AA		 1316 move_to_confirmed(unconf);
1317
1318 /*
1319 * We do not support RDMA or persistent sessions
1320 */
1321 cr_ses->flags &= ~SESSION4_PERSIST;
1322 cr_ses->flags &= ~SESSION4_RDMA;
1323
1324 conf = unconf;
1325 } else {
1326 status = nfserr_stale_clientid;
1327 goto out;
1328 }
1329
1330 status = alloc_init_session(rqstp, conf, cr_ses);
1331 if (status)
1332 goto out;
1333
ec6b5d7b
AA		 1334 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
1335 NFS4_MAX_SESSIONID_LEN);
49557cc7 1336 cr_ses->seqid = cs_slot->sl_seqid;
ec6b5d7b 1337
49557cc7
AA		 1338out_cache:
1339 /* cache solo and embedded create sessions under the state lock */
1340 nfsd4_cache_create_session(cr_ses, cs_slot, status);
ec6b5d7b
AA		 1341out:
1342 nfs4_unlock_state();
1343 dprintk("%s returns %d\n", __func__, ntohl(status));
1344 return status;
069b6ad4
AA		 1345}
1346
1347__be32
1348nfsd4_destroy_session(struct svc_rqst *r,
1349 struct nfsd4_compound_state *cstate,
1350 struct nfsd4_destroy_session *sessionid)
1351{
e10e0cfc
BH		 1352 struct nfsd4_session *ses;
1353 u32 status = nfserr_badsession;
1354
1355 /* Notes:
1356 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1357 * - Should we return nfserr_back_chan_busy if waiting for
1358 * callbacks on to-be-destroyed session?
1359 * - Do we need to clear any callback info from previous session?
1360 */
1361
1362 dump_sessionid(__func__, &sessionid->sessionid);
1363 spin_lock(&sessionid_lock);
1364 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1365 if (!ses) {
1366 spin_unlock(&sessionid_lock);
1367 goto out;
1368 }
1369
1370 unhash_session(ses);
1371 spin_unlock(&sessionid_lock);
1372
1373 /* wait for callbacks */
1374 shutdown_callback_client(ses->se_client);
1375 nfsd4_put_session(ses);
1376 status = nfs_ok;
1377out:
1378 dprintk("%s returns %d\n", __func__, ntohl(status));
1379 return status;
069b6ad4
AA		 1380}
1381
1382__be32
b85d4c01 1383nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1384 struct nfsd4_compound_state *cstate,
1385 struct nfsd4_sequence *seq)
1386{
f9bb94c4 1387 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1388 struct nfsd4_session *session;
1389 struct nfsd4_slot *slot;
1390 int status;
1391
f9bb94c4
AA		 1392 if (resp->opcnt != 1)
1393 return nfserr_sequence_pos;
1394
b85d4c01
BH		 1395 spin_lock(&sessionid_lock);
1396 status = nfserr_badsession;
1397 session = find_in_sessionid_hashtbl(&seq->sessionid);
1398 if (!session)
1399 goto out;
1400
1401 status = nfserr_badslot;
6c18ba9f 1402 if (seq->slotid >= session->se_fchannel.maxreqs)
b85d4c01
BH		 1403 goto out;
1404
557ce264 1405 slot = session->se_slots[seq->slotid];
b85d4c01
BH		 1406 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1407
a8dfdaeb
AA		 1408 /* We do not negotiate the number of slots yet, so set the
1409 * maxslots to the session maxreqs which is used to encode
1410 * sr_highest_slotid and the sr_target_slot id to maxslots */
1411 seq->maxslots = session->se_fchannel.maxreqs;
1412
88e588d5 1413 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
b85d4c01
BH		 1414 if (status == nfserr_replay_cache) {
1415 cstate->slot = slot;
1416 cstate->session = session;
da3846a2 1417 /* Return the cached reply status and set cstate->status
557ce264 1418 * for nfsd4_proc_compound processing */
bf864a31 1419 status = nfsd4_replay_cache_entry(resp, seq);
da3846a2 1420 cstate->status = nfserr_replay_cache;
aaf84eb9 1421 goto out;
b85d4c01
BH		 1422 }
1423 if (status)
1424 goto out;
1425
1426 /* Success! bump slot seqid */
1427 slot->sl_inuse = true;
1428 slot->sl_seqid = seq->seqid;
557ce264 1429 slot->sl_cachethis = seq->cachethis;
b85d4c01
BH		 1430
1431 cstate->slot = slot;
1432 cstate->session = session;
1433
aaf84eb9 1434 /* Hold a session reference until done processing the compound:
b85d4c01
BH		 1435 * nfsd4_put_session called only if the cstate slot is set.
1436 */
b85d4c01
BH		 1437 nfsd4_get_session(session);
1438out:
1439 spin_unlock(&sessionid_lock);
aaf84eb9
BH		 1440 /* Renew the clientid on success and on replay */
1441 if (cstate->session) {
1442 nfs4_lock_state();
1443 renew_client(session->se_client);
1444 nfs4_unlock_state();
1445 }
b85d4c01
BH		 1446 dprintk("%s: return %d\n", __func__, ntohl(status));
1447 return status;
069b6ad4
AA		 1448}
1449
b37ad28b 1450__be32
b591480b
BF		 1451nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1452 struct nfsd4_setclientid *setclid)
1da177e4 1453{
363168b4 1454 struct sockaddr *sa = svc_addr(rqstp);
1da177e4
LT		 1455 struct xdr_netobj clname = {
1456 .len = setclid->se_namelen,
1457 .data = setclid->se_name,
1458 };
1459 nfs4_verifier clverifier = setclid->se_verf;
1460 unsigned int strhashval;
28ce6054 1461 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1462 __be32 status;
68e76ad0 1463 char *princ;
a55370a3 1464 char dname[HEXDIR_LEN];
1da177e4 1465
1da177e4 1466 if (!check_name(clname))
73aea4ec 1467 return nfserr_inval;
1da177e4 1468
a55370a3
N		 1469 status = nfs4_make_rec_clidname(dname, &clname);
1470 if (status)
73aea4ec 1471 return status;
a55370a3 1472
1da177e4
LT		 1473 /*
1474 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1475 * We get here on a DRC miss.
1476 */
1477
a55370a3 1478 strhashval = clientstr_hashval(dname);
1da177e4 1479
1da177e4 1480 nfs4_lock_state();
a1bcecd2 1481 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1482 if (conf) {
a186e767 1483 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1484 status = nfserr_clid_inuse;
026722c2 1485 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
363168b4
JL		 1486 char addr_str[INET6_ADDRSTRLEN];
1487 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
1488 sizeof(addr_str));
1489 dprintk("NFSD: setclientid: string in use by client "
1490 "at %s\n", addr_str);
1da177e4
LT		 1491 goto out;
1492 }
1da177e4 1493 }
a186e767
BF		 1494 /*
1495 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1496 * has a description of SETCLIENTID request processing consisting
1497 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1498 */
a1bcecd2 1499 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1500 status = nfserr_resource;
1501 if (!conf) {
a186e767
BF		 1502 /*
1503 * RFC 3530 14.2.33 CASE 4:
1504 * placed first, because it is the normal case
1da177e4
LT		 1505 */
1506 if (unconf)
1507 expire_client(unconf);
a55370a3
N		 1508 new = create_client(clname, dname);
1509 if (new == NULL)
1da177e4 1510 goto out;
1da177e4 1511 gen_clid(new);
599e0a22 1512 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1513 /*
a186e767
BF		 1514 * RFC 3530 14.2.33 CASE 1:
1515 * probable callback update
1da177e4 1516 */
31f4a6c1
N		 1517 if (unconf) {
1518 /* Note this is removing unconfirmed {*x***},
1519 * which is stronger than RFC recommended {vxc**}.
1520 * This has the advantage that there is at most
1521 * one {*x***} in either list at any time.
1522 */
1523 expire_client(unconf);
1da177e4 1524 }
a55370a3
N		 1525 new = create_client(clname, dname);
1526 if (new == NULL)
1da177e4 1527 goto out;
1da177e4 1528 copy_clid(new, conf);
1da177e4
LT		 1529 } else if (!unconf) {
1530 /*
a186e767
BF		 1531 * RFC 3530 14.2.33 CASE 2:
1532 * probable client reboot; state will be removed if
1533 * confirmed.
1da177e4 1534 */
a55370a3
N		 1535 new = create_client(clname, dname);
1536 if (new == NULL)
1da177e4 1537 goto out;
1da177e4 1538 gen_clid(new);
49ba8781 1539 } else {
a186e767
BF		 1540 /*
1541 * RFC 3530 14.2.33 CASE 3:
1542 * probable client reboot; state will be removed if
1543 * confirmed.
1da177e4
LT		 1544 */
1545 expire_client(unconf);
a55370a3
N		 1546 new = create_client(clname, dname);
1547 if (new == NULL)
1da177e4 1548 goto out;
1da177e4 1549 gen_clid(new);
1da177e4 1550 }
c175b83c 1551 copy_verf(new, &clverifier);
363168b4 1552 rpc_copy_addr((struct sockaddr *) &new->cl_addr, sa);
61054b14 1553 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1554 princ = svc_gss_principal(rqstp);
1555 if (princ) {
1556 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1557 if (new->cl_principal == NULL) {
1558 free_client(new);
1559 goto out;
1560 }
1561 }
c175b83c
BF		 1562 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1563 gen_confirm(new);
fbf4665f 1564 gen_callback(new, setclid, rpc_get_scope_id(sa));
c175b83c 1565 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1566 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1567 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1568 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1569 status = nfs_ok;
1570out:
1571 nfs4_unlock_state();
1572 return status;
1573}
1574
1575
1576/*
a186e767
BF		 1577 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1578 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1579 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1580 */
b37ad28b 1581__be32
b591480b
BF		 1582nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1583 struct nfsd4_compound_state *cstate,
1584 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1585{
363168b4 1586 struct sockaddr *sa = svc_addr(rqstp);
21ab45a4 1587 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1588 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1589 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1590 __be32 status;
1da177e4
LT		 1591
1592 if (STALE_CLIENTID(clid))
1593 return nfserr_stale_clientid;
1594 /*
1595 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1596 * We get here on a DRC miss.
1597 */
1598
1599 nfs4_lock_state();
21ab45a4
N		 1600
1601 conf = find_confirmed_client(clid);
1602 unconf = find_unconfirmed_client(clid);
1603
1604 status = nfserr_clid_inuse;
363168b4 1605 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
21ab45a4 1606 goto out;
363168b4 1607 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
21ab45a4
N		 1608 goto out;
1609
a186e767
BF		 1610 /*
1611 * section 14.2.34 of RFC 3530 has a description of
1612 * SETCLIENTID_CONFIRM request processing consisting
1613 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1614 */
366e0c1d 1615 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1616 /*
1617 * RFC 3530 14.2.34 CASE 1:
1618 * callback update
1619 */
599e0a22 1620 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1621 status = nfserr_clid_inuse;
1622 else {
1a69c179
N		 1623 /* XXX: We just turn off callbacks until we can handle
1624 * change request correctly. */
c237dc03 1625 atomic_set(&conf->cl_cb_conn.cb_set, 0);
1a69c179 1626 expire_client(unconf);
1da177e4 1627 status = nfs_ok;
1a69c179 1628
1da177e4 1629 }
f3aba4e5 1630 } else if (conf && !unconf) {
a186e767
BF		 1631 /*
1632 * RFC 3530 14.2.34 CASE 2:
1633 * probable retransmitted request; play it safe and
1634 * do nothing.
7c79f737 1635 */
599e0a22 1636 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1637 status = nfserr_clid_inuse;
21ab45a4 1638 else
1da177e4 1639 status = nfs_ok;
7c79f737 1640 } else if (!conf && unconf
599e0a22 1641 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1642 /*
1643 * RFC 3530 14.2.34 CASE 3:
1644 * Normal case; new or rebooted client:
7c79f737 1645 */
599e0a22 1646 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1647 status = nfserr_clid_inuse;
1648 } else {
1a69c179
N		 1649 unsigned int hash =
1650 clientstr_hashval(unconf->cl_recdir);
1651 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1652 hash, false);
1a69c179 1653 if (conf) {
c7b9a459 1654 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1655 expire_client(conf);
1656 }
1da177e4 1657 move_to_confirmed(unconf);
21ab45a4 1658 conf = unconf;
46f8a64b 1659 nfsd4_probe_callback(conf);
1a69c179 1660 status = nfs_ok;
1da177e4 1661 }
599e0a22
BF		 1662 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1663 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1664 &confirm)))) {
a186e767
BF		 1665 /*
1666 * RFC 3530 14.2.34 CASE 4:
1667 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1668 */
1da177e4 1669 status = nfserr_stale_clientid;
7c79f737 1670 } else {
08e8987c
N		 1671 /* check that we have hit one of the cases...*/
1672 status = nfserr_clid_inuse;
1673 }
1da177e4 1674out:
1da177e4
LT		 1675 nfs4_unlock_state();
1676 return status;
1677}
1678
1da177e4
LT		 1679/* OPEN Share state helper functions */
1680static inline struct nfs4_file *
1681alloc_init_file(struct inode *ino)
1682{
1683 struct nfs4_file *fp;
1684 unsigned int hashval = file_hashval(ino);
1685
e60d4398
N		 1686 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1687 if (fp) {
8b671b80 1688 atomic_set(&fp->fi_ref, 1);
1da177e4 1689 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1690 INIT_LIST_HEAD(&fp->fi_stateids);
1691 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1692 spin_lock(&recall_lock);
1da177e4 1693 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1694 spin_unlock(&recall_lock);
1da177e4
LT		 1695 fp->fi_inode = igrab(ino);
1696 fp->fi_id = current_fileid++;
47f9940c 1697 fp->fi_had_conflict = false;
1da177e4
LT		 1698 return fp;
1699 }
1700 return NULL;
1701}
1702
e60d4398 1703static void
e18b890b 1704nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1705{
e60d4398
N		 1706 if (*slab == NULL)
1707 return;
1a1d92c1 1708 kmem_cache_destroy(*slab);
e60d4398 1709 *slab = NULL;
1da177e4
LT		 1710}
1711
e8ff2a84 1712void
1da177e4
LT		 1713nfsd4_free_slabs(void)
1714{
e60d4398
N		 1715 nfsd4_free_slab(&stateowner_slab);
1716 nfsd4_free_slab(&file_slab);
5ac049ac 1717 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1718 nfsd4_free_slab(&deleg_slab);
e60d4398 1719}
1da177e4 1720
e60d4398
N		 1721static int
1722nfsd4_init_slabs(void)
1723{
1724 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1725 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1726 if (stateowner_slab == NULL)
1727 goto out_nomem;
1728 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1729 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1730 if (file_slab == NULL)
1731 goto out_nomem;
5ac049ac 1732 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1733 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1734 if (stateid_slab == NULL)
1735 goto out_nomem;
5b2d21c1 1736 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1737 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1738 if (deleg_slab == NULL)
1739 goto out_nomem;
e60d4398
N		 1740 return 0;
1741out_nomem:
1742 nfsd4_free_slabs();
1743 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1744 return -ENOMEM;
1da177e4
LT		 1745}
1746
1747void
1748nfs4_free_stateowner(struct kref *kref)
1749{
1750 struct nfs4_stateowner *sop =
1751 container_of(kref, struct nfs4_stateowner, so_ref);
1752 kfree(sop->so_owner.data);
1753 kmem_cache_free(stateowner_slab, sop);
1754}
1755
1756static inline struct nfs4_stateowner *
1757alloc_stateowner(struct xdr_netobj *owner)
1758{
1759 struct nfs4_stateowner *sop;
1760
1761 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1762 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1763 memcpy(sop->so_owner.data, owner->data, owner->len);
1764 sop->so_owner.len = owner->len;
1765 kref_init(&sop->so_ref);
1766 return sop;
1767 }
1768 kmem_cache_free(stateowner_slab, sop);
1769 }
1770 return NULL;
1771}
1772
1773static struct nfs4_stateowner *
1774alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1775 struct nfs4_stateowner *sop;
1776 struct nfs4_replay *rp;
1777 unsigned int idhashval;
1778
1779 if (!(sop = alloc_stateowner(&open->op_owner)))
1780 return NULL;
1781 idhashval = ownerid_hashval(current_ownerid);
1782 INIT_LIST_HEAD(&sop->so_idhash);
1783 INIT_LIST_HEAD(&sop->so_strhash);
1784 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1785 INIT_LIST_HEAD(&sop->so_stateids);
1786 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1787 INIT_LIST_HEAD(&sop->so_close_lru);
1788 sop->so_time = 0;
1789 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1790 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1791 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1792 sop->so_is_open_owner = 1;
1793 sop->so_id = current_ownerid++;
1794 sop->so_client = clp;
1795 sop->so_seqid = open->op_seqid;
1796 sop->so_confirmed = 0;
1797 rp = &sop->so_replay;
de1ae286 1798 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1799 rp->rp_buflen = 0;
1800 rp->rp_buf = rp->rp_ibuf;
1801 return sop;
1802}
1803
1da177e4
LT		 1804static inline void
1805init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1806 struct nfs4_stateowner *sop = open->op_stateowner;
1807 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1808
1809 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1810 INIT_LIST_HEAD(&stp->st_perstateowner);
1811 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1812 INIT_LIST_HEAD(&stp->st_perfile);
1813 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1814 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1815 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1816 stp->st_stateowner = sop;
13cd2184 1817 get_nfs4_file(fp);
1da177e4 1818 stp->st_file = fp;
78155ed7 1819 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 1820 stp->st_stateid.si_stateownerid = sop->so_id;
1821 stp->st_stateid.si_fileid = fp->fi_id;
1822 stp->st_stateid.si_generation = 0;
1823 stp->st_access_bmap = 0;
1824 stp->st_deny_bmap = 0;
84459a11
AA		 1825 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
1826 &stp->st_access_bmap);
1da177e4 1827 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1828 stp->st_openstp = NULL;
1da177e4
LT		 1829}
1830
fd39ca9a 1831static void
1da177e4
LT		 1832move_to_close_lru(struct nfs4_stateowner *sop)
1833{
1834 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1835
358dd55a 1836 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1837 sop->so_time = get_seconds();
1838}
1839
1da177e4 1840static int
599e0a22
BF		 1841same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1842 clientid_t *clid)
1843{
1844 return (sop->so_owner.len == owner->len) &&
1845 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1846 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1847}
1848
1849static struct nfs4_stateowner *
1850find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1851{
1852 struct nfs4_stateowner *so = NULL;
1853
1854 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1855 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1856 return so;
1857 }
1858 return NULL;
1859}
1860
1861/* search file_hashtbl[] for file */
1862static struct nfs4_file *
1863find_file(struct inode *ino)
1864{
1865 unsigned int hashval = file_hashval(ino);
1866 struct nfs4_file *fp;
1867
8b671b80 1868 spin_lock(&recall_lock);
1da177e4 1869 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1870 if (fp->fi_inode == ino) {
1871 get_nfs4_file(fp);
8b671b80 1872 spin_unlock(&recall_lock);
1da177e4 1873 return fp;
13cd2184 1874 }
1da177e4 1875 }
8b671b80 1876 spin_unlock(&recall_lock);
1da177e4
LT		 1877 return NULL;
1878}
1879
d87a8ade 1880static inline int access_valid(u32 x, u32 minorversion)
ba5a6a19 1881{
d87a8ade 1882 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
8838dc43 1883 return 0;
d87a8ade
AA		 1884 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
1885 return 0;
1886 x &= ~NFS4_SHARE_ACCESS_MASK;
1887 if (minorversion && x) {
1888 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
1889 return 0;
1890 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
1891 return 0;
1892 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
1893 }
1894 if (x)
8838dc43
BF		 1895 return 0;
1896 return 1;
ba5a6a19
BF		 1897}
1898
8838dc43 1899static inline int deny_valid(u32 x)
ba5a6a19 1900{
8838dc43
BF		 1901 /* Note: unlike access bits, deny bits may be zero. */
1902 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1903}
1da177e4 1904
4f83aa30
BF		 1905/*
1906 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1907 * st_{access,deny}_bmap field of the stateid, in order to track not
1908 * only what share bits are currently in force, but also what
1909 * combinations of share bits previous opens have used. This allows us
1910 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1911 * return an error if the client attempt to downgrade to a combination
1912 * of share bits not explicable by closing some of its previous opens.
1913 *
1914 * XXX: This enforcement is actually incomplete, since we don't keep
1915 * track of access/deny bit combinations; so, e.g., we allow:
1916 *
1917 * OPEN allow read, deny write
1918 * OPEN allow both, deny none
1919 * DOWNGRADE allow read, deny none
1920 *
1921 * which we should reject.
1922 */
fd39ca9a 1923static void
1da177e4
LT		 1924set_access(unsigned int *access, unsigned long bmap) {
1925 int i;
1926
1927 *access = 0;
1928 for (i = 1; i < 4; i++) {
1929 if (test_bit(i, &bmap))
1930 *access |= i;
1931 }
1932}
1933
fd39ca9a 1934static void
1da177e4
LT		 1935set_deny(unsigned int *deny, unsigned long bmap) {
1936 int i;
1937
1938 *deny = 0;
1939 for (i = 0; i < 4; i++) {
1940 if (test_bit(i, &bmap))
1941 *deny |= i ;
1942 }
1943}
1944
1945static int
1946test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1947 unsigned int access, deny;
1948
1949 set_access(&access, stp->st_access_bmap);
1950 set_deny(&deny, stp->st_deny_bmap);
1951 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1952 return 0;
1953 return 1;
1954}
1955
1956/*
1957 * Called to check deny when READ with all zero stateid or
1958 * WRITE with all zero or all one stateid
1959 */
b37ad28b 1960static __be32
1da177e4
LT		 1961nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1962{
1963 struct inode *ino = current_fh->fh_dentry->d_inode;
1964 struct nfs4_file *fp;
1965 struct nfs4_stateid *stp;
b37ad28b 1966 __be32 ret;
1da177e4
LT		 1967
1968 dprintk("NFSD: nfs4_share_conflict\n");
1969
1970 fp = find_file(ino);
13cd2184
N		 1971 if (!fp)
1972 return nfs_ok;
b700949b 1973 ret = nfserr_locked;
1da177e4 1974 /* Search for conflicting share reservations */
13cd2184
N		 1975 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1976 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1977 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1978 goto out;
1da177e4 1979 }
13cd2184
N		 1980 ret = nfs_ok;
1981out:
1982 put_nfs4_file(fp);
1983 return ret;
1da177e4
LT		 1984}
1985
1986static inline void
1987nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1988{
1989 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1990 drop_file_write_access(filp);
1da177e4
LT		 1991 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1992 }
1993}
1994
1da177e4
LT		 1995/*
1996 * Spawn a thread to perform a recall on the delegation represented
1997 * by the lease (file_lock)
1998 *
1999 * Called from break_lease() with lock_kernel() held.
2000 * Note: we assume break_lease will only call this *once* for any given
2001 * lease.
2002 */
2003static
2004void nfsd_break_deleg_cb(struct file_lock *fl)
2005{
63e4863f 2006 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1da177e4
LT		 2007
2008 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2009 if (!dp)
2010 return;
2011
2012 /* We're assuming the state code never drops its reference
2013 * without first removing the lease. Since we're in this lease
2014 * callback (and since the lease code is serialized by the kernel
2015 * lock) we know the server hasn't removed the lease yet, we know
2016 * it's safe to take a reference: */
2017 atomic_inc(&dp->dl_count);
cfdcad4d 2018 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 2019
2020 spin_lock(&recall_lock);
2021 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2022 spin_unlock(&recall_lock);
2023
2024 /* only place dl_time is set. protected by lock_kernel*/
2025 dp->dl_time = get_seconds();
2026
0272e1fd
BF		 2027 /*
2028 * We don't want the locks code to timeout the lease for us;
2029 * we'll remove it ourself if the delegation isn't returned
2030 * in time.
2031 */
2032 fl->fl_break_time = 0;
1da177e4 2033
63e4863f
BF		 2034 dp->dl_file->fi_had_conflict = true;
2035 nfsd4_cb_recall(dp);
1da177e4
LT		 2036}
2037
2038/*
2039 * The file_lock is being reapd.
2040 *
2041 * Called by locks_free_lock() with lock_kernel() held.
2042 */
2043static
2044void nfsd_release_deleg_cb(struct file_lock *fl)
2045{
2046 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2047
2048 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
2049
2050 if (!(fl->fl_flags & FL_LEASE) || !dp)
2051 return;
2052 dp->dl_flock = NULL;
2053}
2054
2055/*
2056 * Set the delegation file_lock back pointer.
2057 *
a9933cea 2058 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 2059 */
2060static
2061void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
2062{
2063 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
2064
2065 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
2066 if (!dp)
2067 return;
2068 dp->dl_flock = new;
2069}
2070
2071/*
a9933cea 2072 * Called from setlease() with lock_kernel() held
1da177e4
LT		 2073 */
2074static
2075int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
2076{
2077 struct nfs4_delegation *onlistd =
2078 (struct nfs4_delegation *)onlist->fl_owner;
2079 struct nfs4_delegation *tryd =
2080 (struct nfs4_delegation *)try->fl_owner;
2081
2082 if (onlist->fl_lmops != try->fl_lmops)
2083 return 0;
2084
2085 return onlistd->dl_client == tryd->dl_client;
2086}
2087
2088
2089static
2090int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2091{
2092 if (arg & F_UNLCK)
2093 return lease_modify(onlist, arg);
2094 else
2095 return -EAGAIN;
2096}
2097
fd39ca9a 2098static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 2099 .fl_break = nfsd_break_deleg_cb,
2100 .fl_release_private = nfsd_release_deleg_cb,
2101 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
2102 .fl_mylease = nfsd_same_client_deleg_cb,
2103 .fl_change = nfsd_change_deleg_cb,
2104};
2105
2106
b37ad28b 2107__be32
6668958f
AA		 2108nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2109 struct nfsd4_open *open)
1da177e4 2110{
1da177e4
LT		 2111 clientid_t *clientid = &open->op_clientid;
2112 struct nfs4_client *clp = NULL;
2113 unsigned int strhashval;
2114 struct nfs4_stateowner *sop = NULL;
2115
1da177e4 2116 if (!check_name(open->op_owner))
0f442aa2 2117 return nfserr_inval;
1da177e4
LT		 2118
2119 if (STALE_CLIENTID(&open->op_clientid))
2120 return nfserr_stale_clientid;
2121
2122 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2123 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 2124 open->op_stateowner = sop;
2125 if (!sop) {
2126 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 2127 clp = find_confirmed_client(clientid);
2128 if (clp == NULL)
0f442aa2
BF		 2129 return nfserr_expired;
2130 goto renew;
1da177e4 2131 }
6668958f
AA		 2132 /* When sessions are used, skip open sequenceid processing */
2133 if (nfsd4_has_session(cstate))
2134 goto renew;
0f442aa2
BF		 2135 if (!sop->so_confirmed) {
2136 /* Replace unconfirmed owners without checking for replay. */
2137 clp = sop->so_client;
f044ff83 2138 release_openowner(sop);
0f442aa2
BF		 2139 open->op_stateowner = NULL;
2140 goto renew;
2141 }
2142 if (open->op_seqid == sop->so_seqid - 1) {
2143 if (sop->so_replay.rp_buflen)
a90b061c 2144 return nfserr_replay_me;
0f442aa2
BF		 2145 /* The original OPEN failed so spectacularly
2146 * that we don't even have replay data saved!
2147 * Therefore, we have no choice but to continue
2148 * processing this OPEN; presumably, we'll
2149 * fail again for the same reason.
2150 */
2151 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2152 goto renew;
2153 }
2154 if (open->op_seqid != sop->so_seqid)
2155 return nfserr_bad_seqid;
1da177e4 2156renew:
0f442aa2
BF		 2157 if (open->op_stateowner == NULL) {
2158 sop = alloc_init_open_stateowner(strhashval, clp, open);
2159 if (sop == NULL)
2160 return nfserr_resource;
2161 open->op_stateowner = sop;
2162 }
2163 list_del_init(&sop->so_close_lru);
1da177e4 2164 renew_client(sop->so_client);
0f442aa2 2165 return nfs_ok;
1da177e4
LT		 2166}
2167
b37ad28b 2168static inline __be32
4a6e43e6
N		 2169nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2170{
2171 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2172 return nfserr_openmode;
2173 else
2174 return nfs_ok;
2175}
2176
52f4fb43
N		 2177static struct nfs4_delegation *
2178find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2179{
2180 struct nfs4_delegation *dp;
2181
ea1da636 2182 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 2183 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2184 return dp;
2185 }
2186 return NULL;
2187}
2188
b37ad28b 2189static __be32
567d9829
N		 2190nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2191 struct nfs4_delegation **dp)
2192{
2193 int flags;
b37ad28b 2194 __be32 status = nfserr_bad_stateid;
567d9829
N		 2195
2196 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2197 if (*dp == NULL)
c44c5eeb 2198 goto out;
567d9829
N		 2199 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
2200 RD_STATE : WR_STATE;
2201 status = nfs4_check_delegmode(*dp, flags);
2202 if (status)
2203 *dp = NULL;
c44c5eeb
N		 2204out:
2205 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2206 return nfs_ok;
2207 if (status)
2208 return status;
2209 open->op_stateowner->so_confirmed = 1;
2210 return nfs_ok;
567d9829
N		 2211}
2212
b37ad28b 2213static __be32
1da177e4
LT		 2214nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2215{
2216 struct nfs4_stateid *local;
b37ad28b 2217 __be32 status = nfserr_share_denied;
1da177e4
LT		 2218 struct nfs4_stateowner *sop = open->op_stateowner;
2219
8beefa24 2220 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 2221 /* ignore lock owners */
2222 if (local->st_stateowner->so_is_open_owner == 0)
2223 continue;
2224 /* remember if we have seen this open owner */
2225 if (local->st_stateowner == sop)
2226 *stpp = local;
2227 /* check for conflicting share reservations */
2228 if (!test_share(local, open))
2229 goto out;
2230 }
2231 status = 0;
2232out:
2233 return status;
2234}
2235
5ac049ac
N		 2236static inline struct nfs4_stateid *
2237nfs4_alloc_stateid(void)
2238{
2239 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2240}
2241
b37ad28b 2242static __be32
1da177e4 2243nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 2244 struct nfs4_delegation *dp,
1da177e4
LT		 2245 struct svc_fh *cur_fh, int flags)
2246{
2247 struct nfs4_stateid *stp;
1da177e4 2248
5ac049ac 2249 stp = nfs4_alloc_stateid();
1da177e4
LT		 2250 if (stp == NULL)
2251 return nfserr_resource;
2252
567d9829
N		 2253 if (dp) {
2254 get_file(dp->dl_vfs_file);
2255 stp->st_vfs_file = dp->dl_vfs_file;
2256 } else {
b37ad28b 2257 __be32 status;
567d9829
N		 2258 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
2259 &stp->st_vfs_file);
2260 if (status) {
2261 if (status == nfserr_dropit)
2262 status = nfserr_jukebox;
5ac049ac 2263 kmem_cache_free(stateid_slab, stp);
567d9829
N		 2264 return status;
2265 }
1da177e4 2266 }
1da177e4
LT		 2267 *stpp = stp;
2268 return 0;
2269}
2270
b37ad28b 2271static inline __be32
1da177e4
LT		 2272nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2273 struct nfsd4_open *open)
2274{
2275 struct iattr iattr = {
2276 .ia_valid = ATTR_SIZE,
2277 .ia_size = 0,
2278 };
2279 if (!open->op_truncate)
2280 return 0;
2281 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 2282 return nfserr_inval;
1da177e4
LT		 2283 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2284}
2285
b37ad28b 2286static __be32
1da177e4
LT		 2287nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2288{
2289 struct file *filp = stp->st_vfs_file;
7eaa36e2 2290 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 2291 unsigned int share_access, new_writer;
b37ad28b 2292 __be32 status;
1da177e4
LT		 2293
2294 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 2295 new_writer = (~share_access) & open->op_share_access
2296 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 2297
6c26d08f 2298 if (new_writer) {
b37ad28b
AV		 2299 int err = get_write_access(inode);
2300 if (err)
2301 return nfserrno(err);
e518f056
BH		 2302 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
2303 if (err)
2304 return nfserrno(err);
2305 file_take_write(filp);
6c26d08f 2306 }
1da177e4
LT		 2307 status = nfsd4_truncate(rqstp, cur_fh, open);
2308 if (status) {
6c26d08f
BF		 2309 if (new_writer)
2310 put_write_access(inode);
1da177e4
LT		 2311 return status;
2312 }
2313 /* remember the open */
6c26d08f 2314 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 2315 __set_bit(open->op_share_access, &stp->st_access_bmap);
2316 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 2317
2318 return nfs_ok;
2319}
2320
2321
1da177e4 2322static void
37515177 2323nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 2324{
37515177
N		 2325 open->op_stateowner->so_confirmed = 1;
2326 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 2327}
2328
2329/*
2330 * Attempt to hand out a delegation.
2331 */
2332static void
2333nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2334{
2335 struct nfs4_delegation *dp;
2336 struct nfs4_stateowner *sop = stp->st_stateowner;
c237dc03 2337 struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn;
1da177e4
LT		 2338 struct file_lock fl, *flp = &fl;
2339 int status, flag = 0;
2340
2341 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 2342 open->op_recall = 0;
2343 switch (open->op_claim_type) {
2344 case NFS4_OPEN_CLAIM_PREVIOUS:
2345 if (!atomic_read(&cb->cb_set))
2346 open->op_recall = 1;
2347 flag = open->op_delegate_type;
2348 if (flag == NFS4_OPEN_DELEGATE_NONE)
2349 goto out;
2350 break;
2351 case NFS4_OPEN_CLAIM_NULL:
2352 /* Let's not give out any delegations till everyone's
2353 * had the chance to reclaim theirs.... */
af558e33 2354 if (locks_in_grace())
7b190fec
N		 2355 goto out;
2356 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2357 goto out;
2358 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2359 flag = NFS4_OPEN_DELEGATE_WRITE;
2360 else
2361 flag = NFS4_OPEN_DELEGATE_READ;
2362 break;
2363 default:
2364 goto out;
2365 }
1da177e4
LT		 2366
2367 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2368 if (dp == NULL) {
2369 flag = NFS4_OPEN_DELEGATE_NONE;
2370 goto out;
2371 }
2372 locks_init_lock(&fl);
2373 fl.fl_lmops = &nfsd_lease_mng_ops;
2374 fl.fl_flags = FL_LEASE;
9167f501 2375 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2376 fl.fl_end = OFFSET_MAX;
2377 fl.fl_owner = (fl_owner_t)dp;
2378 fl.fl_file = stp->st_vfs_file;
2379 fl.fl_pid = current->tgid;
2380
a9933cea 2381 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2382 * the lock_manager callbacks fl_mylease and fl_change are used
2383 */
9167f501 2384 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2385 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2386 unhash_delegation(dp);
1da177e4
LT		 2387 flag = NFS4_OPEN_DELEGATE_NONE;
2388 goto out;
2389 }
2390
2391 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2392
2393 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
2394 dp->dl_stateid.si_boot,
2395 dp->dl_stateid.si_stateownerid,
2396 dp->dl_stateid.si_fileid,
2397 dp->dl_stateid.si_generation);
2398out:
7b190fec
N		 2399 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2400 && flag == NFS4_OPEN_DELEGATE_NONE
2401 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2402 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2403 open->op_delegate_type = flag;
2404}
2405
2406/*
2407 * called with nfs4_lock_state() held.
2408 */
b37ad28b 2409__be32
1da177e4
LT		 2410nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2411{
6668958f 2412 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1da177e4
LT		 2413 struct nfs4_file *fp = NULL;
2414 struct inode *ino = current_fh->fh_dentry->d_inode;
2415 struct nfs4_stateid *stp = NULL;
567d9829 2416 struct nfs4_delegation *dp = NULL;
b37ad28b 2417 __be32 status;
1da177e4
LT		 2418
2419 status = nfserr_inval;
d87a8ade 2420 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
ba5a6a19 2421 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2422 goto out;
2423 /*
2424 * Lookup file; if found, lookup stateid and check open request,
2425 * and check for delegations in the process of being recalled.
2426 * If not found, create the nfs4_file struct
2427 */
2428 fp = find_file(ino);
2429 if (fp) {
2430 if ((status = nfs4_check_open(fp, open, &stp)))
2431 goto out;
c44c5eeb
N		 2432 status = nfs4_check_deleg(fp, open, &dp);
2433 if (status)
2434 goto out;
1da177e4 2435 } else {
c44c5eeb
N		 2436 status = nfserr_bad_stateid;
2437 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2438 goto out;
1da177e4
LT		 2439 status = nfserr_resource;
2440 fp = alloc_init_file(ino);
2441 if (fp == NULL)
2442 goto out;
2443 }
2444
2445 /*
2446 * OPEN the file, or upgrade an existing OPEN.
2447 * If truncate fails, the OPEN fails.
2448 */
2449 if (stp) {
2450 /* Stateid was found, this is an OPEN upgrade */
2451 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2452 if (status)
2453 goto out;
444c2c07 2454 update_stateid(&stp->st_stateid);
1da177e4
LT		 2455 } else {
2456 /* Stateid was not found, this is a new OPEN */
2457 int flags = 0;
9ecb6a08 2458 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2459 flags |= NFSD_MAY_READ;
1da177e4 2460 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2461 flags |= NFSD_MAY_WRITE;
567d9829
N		 2462 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2463 if (status)
1da177e4
LT		 2464 goto out;
2465 init_stateid(stp, fp, open);
2466 status = nfsd4_truncate(rqstp, current_fh, open);
2467 if (status) {
2283963f 2468 release_open_stateid(stp);
1da177e4
LT		 2469 goto out;
2470 }
6668958f
AA		 2471 if (nfsd4_has_session(&resp->cstate))
2472 update_stateid(&stp->st_stateid);
1da177e4
LT		 2473 }
2474 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2475
6668958f
AA		 2476 if (nfsd4_has_session(&resp->cstate))
2477 open->op_stateowner->so_confirmed = 1;
2478
1da177e4
LT		 2479 /*
2480 * Attempt to hand out a delegation. No error return, because the
2481 * OPEN succeeds even if we fail.
2482 */
2483 nfs4_open_delegation(current_fh, open, stp);
2484
2485 status = nfs_ok;
2486
2487 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2488 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2489 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2490out:
13cd2184
N		 2491 if (fp)
2492 put_nfs4_file(fp);
37515177
N		 2493 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2494 nfs4_set_claim_prev(open);
1da177e4
LT		 2495 /*
2496 * To finish the open response, we just need to set the rflags.
2497 */
2498 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6668958f
AA		 2499 if (!open->op_stateowner->so_confirmed &&
2500 !nfsd4_has_session(&resp->cstate))
1da177e4
LT		 2501 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2502
2503 return status;
2504}
2505
b37ad28b 2506__be32
b591480b
BF		 2507nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2508 clientid_t *clid)
1da177e4
LT		 2509{
2510 struct nfs4_client *clp;
b37ad28b 2511 __be32 status;
1da177e4
LT		 2512
2513 nfs4_lock_state();
2514 dprintk("process_renew(%08x/%08x): starting\n",
2515 clid->cl_boot, clid->cl_id);
2516 status = nfserr_stale_clientid;
2517 if (STALE_CLIENTID(clid))
2518 goto out;
2519 clp = find_confirmed_client(clid);
2520 status = nfserr_expired;
2521 if (clp == NULL) {
2522 /* We assume the client took too long to RENEW. */
2523 dprintk("nfsd4_renew: clientid not found!\n");
2524 goto out;
2525 }
2526 renew_client(clp);
2527 status = nfserr_cb_path_down;
ea1da636 2528 if (!list_empty(&clp->cl_delegations)
c237dc03 2529 && !atomic_read(&clp->cl_cb_conn.cb_set))
1da177e4
LT		 2530 goto out;
2531 status = nfs_ok;
2532out:
2533 nfs4_unlock_state();
2534 return status;
2535}
2536
af558e33
BF		 2537struct lock_manager nfsd4_manager = {
2538};
2539
a76b4319 2540static void
af558e33 2541nfsd4_end_grace(void)
a76b4319
N		 2542{
2543 dprintk("NFSD: end of grace period\n");
c7b9a459 2544 nfsd4_recdir_purge_old();
af558e33 2545 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2546}
2547
fd39ca9a 2548static time_t
1da177e4
LT		 2549nfs4_laundromat(void)
2550{
2551 struct nfs4_client *clp;
2552 struct nfs4_stateowner *sop;
2553 struct nfs4_delegation *dp;
2554 struct list_head *pos, *next, reaplist;
2555 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2556 time_t t, clientid_val = NFSD_LEASE_TIME;
2557 time_t u, test_val = NFSD_LEASE_TIME;
2558
2559 nfs4_lock_state();
2560
2561 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2562 if (locks_in_grace())
2563 nfsd4_end_grace();
1da177e4
LT		 2564 list_for_each_safe(pos, next, &client_lru) {
2565 clp = list_entry(pos, struct nfs4_client, cl_lru);
2566 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2567 t = clp->cl_time - cutoff;
2568 if (clientid_val > t)
2569 clientid_val = t;
2570 break;
2571 }
2572 dprintk("NFSD: purging unused client (clientid %08x)\n",
2573 clp->cl_clientid.cl_id);
c7b9a459 2574 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2575 expire_client(clp);
2576 }
2577 INIT_LIST_HEAD(&reaplist);
2578 spin_lock(&recall_lock);
2579 list_for_each_safe(pos, next, &del_recall_lru) {
2580 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2581 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2582 u = dp->dl_time - cutoff;
2583 if (test_val > u)
2584 test_val = u;
2585 break;
2586 }
2587 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2588 dp, dp->dl_flock);
2589 list_move(&dp->dl_recall_lru, &reaplist);
2590 }
2591 spin_unlock(&recall_lock);
2592 list_for_each_safe(pos, next, &reaplist) {
2593 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2594 list_del_init(&dp->dl_recall_lru);
2595 unhash_delegation(dp);
2596 }
2597 test_val = NFSD_LEASE_TIME;
2598 list_for_each_safe(pos, next, &close_lru) {
2599 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2600 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2601 u = sop->so_time - cutoff;
2602 if (test_val > u)
2603 test_val = u;
2604 break;
2605 }
2606 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2607 sop->so_id);
f044ff83 2608 release_openowner(sop);
1da177e4
LT		 2609 }
2610 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2611 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2612 nfs4_unlock_state();
2613 return clientid_val;
2614}
2615
a254b246
HH		 2616static struct workqueue_struct *laundry_wq;
2617static void laundromat_main(struct work_struct *);
2618static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2619
2620static void
c4028958 2621laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2622{
2623 time_t t;
2624
2625 t = nfs4_laundromat();
2626 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2627 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2628}
2629
fd39ca9a 2630static struct nfs4_stateowner *
f8816512
N		 2631search_close_lru(u32 st_id, int flags)
2632{
1da177e4
LT		 2633 struct nfs4_stateowner *local = NULL;
2634
1da177e4
LT		 2635 if (flags & CLOSE_STATE) {
2636 list_for_each_entry(local, &close_lru, so_close_lru) {
2637 if (local->so_id == st_id)
2638 return local;
2639 }
2640 }
2641 return NULL;
2642}
2643
2644static inline int
2645nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2646{
7eaa36e2 2647 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2648}
2649
2650static int
2651STALE_STATEID(stateid_t *stateid)
2652{
78155ed7
BN		 2653 if (time_after((unsigned long)boot_time,
2654 (unsigned long)stateid->si_boot)) {
2655 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2656 stateid->si_boot, stateid->si_stateownerid,
2657 stateid->si_fileid, stateid->si_generation);
2658 return 1;
2659 }
2660 return 0;
2661}
2662
2663static int
2664EXPIRED_STATEID(stateid_t *stateid)
2665{
2666 if (time_before((unsigned long)boot_time,
2667 ((unsigned long)stateid->si_boot)) &&
b8fd47ae 2668 time_before((unsigned long)(stateid->si_boot + lease_time), get_seconds())) {
78155ed7
BN		 2669 dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n",
2670 stateid->si_boot, stateid->si_stateownerid,
2671 stateid->si_fileid, stateid->si_generation);
2672 return 1;
2673 }
2674 return 0;
2675}
2676
2677static __be32
2678stateid_error_map(stateid_t *stateid)
2679{
2680 if (STALE_STATEID(stateid))
2681 return nfserr_stale_stateid;
2682 if (EXPIRED_STATEID(stateid))
2683 return nfserr_expired;
2684
2685 dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n",
2686 stateid->si_boot, stateid->si_stateownerid,
2687 stateid->si_fileid, stateid->si_generation);
2688 return nfserr_bad_stateid;
1da177e4
LT		 2689}
2690
2691static inline int
2692access_permit_read(unsigned long access_bmap)
2693{
2694 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2695 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2696 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2697}
2698
2699static inline int
2700access_permit_write(unsigned long access_bmap)
2701{
2702 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2703 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2704}
2705
2706static
b37ad28b 2707__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2708{
b37ad28b 2709 __be32 status = nfserr_openmode;
1da177e4
LT		 2710
2711 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2712 goto out;
2713 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2714 goto out;
2715 status = nfs_ok;
2716out:
2717 return status;
2718}
2719
b37ad28b 2720static inline __be32
1da177e4
LT		 2721check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2722{
203a8c8e 2723 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2724 return nfs_ok;
af558e33 2725 else if (locks_in_grace()) {
1da177e4
LT		 2726 /* Answer in remaining cases depends on existance of
2727 * conflicting state; so we must wait out the grace period. */
2728 return nfserr_grace;
2729 } else if (flags & WR_STATE)
2730 return nfs4_share_conflict(current_fh,
2731 NFS4_SHARE_DENY_WRITE);
2732 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2733 return nfs4_share_conflict(current_fh,
2734 NFS4_SHARE_DENY_READ);
2735}
2736
2737/*
2738 * Allow READ/WRITE during grace period on recovered state only for files
2739 * that are not able to provide mandatory locking.
2740 */
2741static inline int
18f82731 2742grace_disallows_io(struct inode *inode)
1da177e4 2743{
203a8c8e 2744 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2745}
2746
6668958f 2747static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
0836f587 2748{
6668958f
AA		 2749 /*
2750 * When sessions are used the stateid generation number is ignored
2751 * when it is zero.
2752 */
2753 if ((flags & HAS_SESSION) && in->si_generation == 0)
2754 goto out;
2755
0836f587
BF		 2756 /* If the client sends us a stateid from the future, it's buggy: */
2757 if (in->si_generation > ref->si_generation)
2758 return nfserr_bad_stateid;
2759 /*
2760 * The following, however, can happen. For example, if the
2761 * client sends an open and some IO at the same time, the open
2762 * may bump si_generation while the IO is still in flight.
2763 * Thanks to hard links and renames, the client never knows what
2764 * file an open will affect. So it could avoid that situation
2765 * only by serializing all opens and IO from the same open
2766 * owner. To recover from the old_stateid error, the client
2767 * will just have to retry the IO:
2768 */
2769 if (in->si_generation < ref->si_generation)
2770 return nfserr_old_stateid;
6668958f 2771out:
0836f587
BF		 2772 return nfs_ok;
2773}
2774
3e633079
BF		 2775static int is_delegation_stateid(stateid_t *stateid)
2776{
2777 return stateid->si_fileid == 0;
2778}
2779
1da177e4
LT		 2780/*
2781* Checks for stateid operations
2782*/
b37ad28b 2783__be32
dd453dfd
BH		 2784nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
2785 stateid_t *stateid, int flags, struct file **filpp)
1da177e4
LT		 2786{
2787 struct nfs4_stateid *stp = NULL;
2788 struct nfs4_delegation *dp = NULL;
dd453dfd 2789 struct svc_fh *current_fh = &cstate->current_fh;
1da177e4 2790 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2791 __be32 status;
1da177e4 2792
1da177e4
LT		 2793 if (filpp)
2794 *filpp = NULL;
2795
18f82731 2796 if (grace_disallows_io(ino))
1da177e4
LT		 2797 return nfserr_grace;
2798
6668958f
AA		 2799 if (nfsd4_has_session(cstate))
2800 flags |= HAS_SESSION;
2801
1da177e4
LT		 2802 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2803 return check_special_stateids(current_fh, stateid, flags);
2804
1da177e4
LT		 2805 status = nfserr_stale_stateid;
2806 if (STALE_STATEID(stateid))
2807 goto out;
2808
1da177e4 2809 status = nfserr_bad_stateid;
3e633079 2810 if (is_delegation_stateid(stateid)) {
a4455be0 2811 dp = find_delegation_stateid(ino, stateid);
78155ed7
BN		 2812 if (!dp) {
2813 status = stateid_error_map(stateid);
1da177e4 2814 goto out;
78155ed7 2815 }
6668958f
AA		 2816 status = check_stateid_generation(stateid, &dp->dl_stateid,
2817 flags);
0c2a498f
BF		 2818 if (status)
2819 goto out;
dc9bf700
BF		 2820 status = nfs4_check_delegmode(dp, flags);
2821 if (status)
2822 goto out;
2823 renew_client(dp->dl_client);
dc9bf700
BF		 2824 if (filpp)
2825 *filpp = dp->dl_vfs_file;
1da177e4 2826 } else { /* open or lock stateid */
a4455be0 2827 stp = find_stateid(stateid, flags);
78155ed7
BN		 2828 if (!stp) {
2829 status = stateid_error_map(stateid);
1da177e4 2830 goto out;
78155ed7 2831 }
6150ef0d 2832 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2833 goto out;
2834 if (!stp->st_stateowner->so_confirmed)
2835 goto out;
6668958f
AA		 2836 status = check_stateid_generation(stateid, &stp->st_stateid,
2837 flags);
0c2a498f
BF		 2838 if (status)
2839 goto out;
a4455be0
BF		 2840 status = nfs4_check_openmode(stp, flags);
2841 if (status)
1da177e4
LT		 2842 goto out;
2843 renew_client(stp->st_stateowner->so_client);
2844 if (filpp)
2845 *filpp = stp->st_vfs_file;
1da177e4
LT		 2846 }
2847 status = nfs_ok;
2848out:
2849 return status;
2850}
2851
4c4cd222
N		 2852static inline int
2853setlkflg (int type)
2854{
2855 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2856 RD_STATE : WR_STATE;
2857}
1da177e4
LT		 2858
2859/*
2860 * Checks for sequence id mutating operations.
2861 */
b37ad28b 2862static __be32
dd453dfd
BH		 2863nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
2864 stateid_t *stateid, int flags,
2865 struct nfs4_stateowner **sopp,
2866 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2867{
1da177e4
LT		 2868 struct nfs4_stateid *stp;
2869 struct nfs4_stateowner *sop;
dd453dfd 2870 struct svc_fh *current_fh = &cstate->current_fh;
0836f587 2871 __be32 status;
1da177e4
LT		 2872
2873 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2874 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2875 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2876 stateid->si_generation);
3a4f98bb 2877
1da177e4
LT		 2878 *stpp = NULL;
2879 *sopp = NULL;
2880
1da177e4 2881 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2882 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2883 return nfserr_bad_stateid;
1da177e4
LT		 2884 }
2885
1da177e4 2886 if (STALE_STATEID(stateid))
3a4f98bb 2887 return nfserr_stale_stateid;
6668958f
AA		 2888
2889 if (nfsd4_has_session(cstate))
2890 flags |= HAS_SESSION;
2891
1da177e4
LT		 2892 /*
2893 * We return BAD_STATEID if filehandle doesn't match stateid,
2894 * the confirmed flag is incorrecly set, or the generation
2895 * number is incorrect.
1da177e4 2896 */
f8816512
N		 2897 stp = find_stateid(stateid, flags);
2898 if (stp == NULL) {
2899 /*
2900 * Also, we should make sure this isn't just the result of
2901 * a replayed close:
2902 */
2903 sop = search_close_lru(stateid->si_stateownerid, flags);
2904 if (sop == NULL)
78155ed7 2905 return stateid_error_map(stateid);
f8816512
N		 2906 *sopp = sop;
2907 goto check_replay;
2908 }
1da177e4 2909
39325bd0
BF		 2910 *stpp = stp;
2911 *sopp = sop = stp->st_stateowner;
2912
4c4cd222 2913 if (lock) {
4c4cd222 2914 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2915 struct nfs4_client *clp = sop->so_client;
4c4cd222 2916 int lkflg = 0;
b37ad28b 2917 __be32 status;
4c4cd222
N		 2918
2919 lkflg = setlkflg(lock->lk_type);
2920
2921 if (lock->lk_is_new) {
599e0a22
BF		 2922 if (!sop->so_is_open_owner)
2923 return nfserr_bad_stateid;
60adfc50
AA		 2924 if (!(flags & HAS_SESSION) &&
2925 !same_clid(&clp->cl_clientid, lockclid))
2926 return nfserr_bad_stateid;
599e0a22
BF		 2927 /* stp is the open stateid */
2928 status = nfs4_check_openmode(stp, lkflg);
2929 if (status)
2930 return status;
2931 } else {
2932 /* stp is the lock stateid */
2933 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2934 if (status)
2935 return status;
4c4cd222 2936 }
1da177e4
LT		 2937 }
2938
f3362737 2939 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2940 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2941 return nfserr_bad_stateid;
1da177e4
LT		 2942 }
2943
1da177e4
LT		 2944 /*
2945 * We now validate the seqid and stateid generation numbers.
2946 * For the moment, we ignore the possibility of
2947 * generation number wraparound.
2948 */
6668958f 2949 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
1da177e4
LT		 2950 goto check_replay;
2951
3a4f98bb 2952 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2953 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2954 " unconfirmed stateowner!\n");
2955 return nfserr_bad_stateid;
1da177e4 2956 }
3a4f98bb 2957 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2958 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2959 " confirmed yet!\n");
2960 return nfserr_bad_stateid;
1da177e4 2961 }
6668958f 2962 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
0836f587
BF		 2963 if (status)
2964 return status;
52fd004e 2965 renew_client(sop->so_client);
3a4f98bb 2966 return nfs_ok;
1da177e4 2967
1da177e4 2968check_replay:
bd9aac52 2969 if (seqid == sop->so_seqid - 1) {
849823c5 2970 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2971 /* indicate replay to calling function */
a90b061c 2972 return nfserr_replay_me;
1da177e4 2973 }
2fdada03 2974 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2975 sop->so_seqid, seqid);
2976 *sopp = NULL;
2977 return nfserr_bad_seqid;
1da177e4
LT		 2978}
2979
b37ad28b 2980__be32
ca364317 2981nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2982 struct nfsd4_open_confirm *oc)
1da177e4 2983{
b37ad28b 2984 __be32 status;
1da177e4
LT		 2985 struct nfs4_stateowner *sop;
2986 struct nfs4_stateid *stp;
2987
2988 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2989 (int)cstate->current_fh.fh_dentry->d_name.len,
2990 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2991
ca364317 2992 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2993 if (status)
2994 return status;
1da177e4
LT		 2995
2996 nfs4_lock_state();
2997
dd453dfd 2998 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 2999 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 3000 CONFIRM | OPEN_STATE,
1da177e4
LT		 3001 &oc->oc_stateowner, &stp, NULL)))
3002 goto out;
3003
3004 sop = oc->oc_stateowner;
3005 sop->so_confirmed = 1;
3006 update_stateid(&stp->st_stateid);
3007 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3008 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
3009 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
3010 stp->st_stateid.si_boot,
3011 stp->st_stateid.si_stateownerid,
3012 stp->st_stateid.si_fileid,
3013 stp->st_stateid.si_generation);
c7b9a459
N		 3014
3015 nfsd4_create_clid_dir(sop->so_client);
1da177e4 3016out:
f2327d9a 3017 if (oc->oc_stateowner) {
1da177e4 3018 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 3019 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 3020 }
1da177e4
LT		 3021 nfs4_unlock_state();
3022 return status;
3023}
3024
3025
3026/*
3027 * unset all bits in union bitmap (bmap) that
3028 * do not exist in share (from successful OPEN_DOWNGRADE)
3029 */
3030static void
3031reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3032{
3033 int i;
3034 for (i = 1; i < 4; i++) {
3035 if ((i & access) != i)
3036 __clear_bit(i, bmap);
3037 }
3038}
3039
3040static void
3041reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3042{
3043 int i;
3044 for (i = 0; i < 4; i++) {
3045 if ((i & deny) != i)
3046 __clear_bit(i, bmap);
3047 }
3048}
3049
b37ad28b 3050__be32
ca364317
BF		 3051nfsd4_open_downgrade(struct svc_rqst *rqstp,
3052 struct nfsd4_compound_state *cstate,
a4f1706a 3053 struct nfsd4_open_downgrade *od)
1da177e4 3054{
b37ad28b 3055 __be32 status;
1da177e4
LT		 3056 struct nfs4_stateid *stp;
3057 unsigned int share_access;
3058
3059 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 3060 (int)cstate->current_fh.fh_dentry->d_name.len,
3061 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3062
d87a8ade 3063 if (!access_valid(od->od_share_access, cstate->minorversion)
ba5a6a19 3064 || !deny_valid(od->od_share_deny))
1da177e4
LT		 3065 return nfserr_inval;
3066
3067 nfs4_lock_state();
dd453dfd 3068 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3069 od->od_seqid,
1da177e4 3070 &od->od_stateid,
f3362737 3071 OPEN_STATE,
1da177e4
LT		 3072 &od->od_stateowner, &stp, NULL)))
3073 goto out;
3074
3075 status = nfserr_inval;
3076 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3077 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3078 stp->st_access_bmap, od->od_share_access);
3079 goto out;
3080 }
3081 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3082 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3083 stp->st_deny_bmap, od->od_share_deny);
3084 goto out;
3085 }
3086 set_access(&share_access, stp->st_access_bmap);
3087 nfs4_file_downgrade(stp->st_vfs_file,
3088 share_access & ~od->od_share_access);
3089
3090 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3091 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3092
3093 update_stateid(&stp->st_stateid);
3094 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3095 status = nfs_ok;
3096out:
f2327d9a 3097 if (od->od_stateowner) {
1da177e4 3098 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 3099 cstate->replay_owner = od->od_stateowner;
f2327d9a 3100 }
1da177e4
LT		 3101 nfs4_unlock_state();
3102 return status;
3103}
3104
3105/*
3106 * nfs4_unlock_state() called after encode
3107 */
b37ad28b 3108__be32
ca364317 3109nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3110 struct nfsd4_close *close)
1da177e4 3111{
b37ad28b 3112 __be32 status;
1da177e4
LT		 3113 struct nfs4_stateid *stp;
3114
3115 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 3116 (int)cstate->current_fh.fh_dentry->d_name.len,
3117 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 3118
3119 nfs4_lock_state();
3120 /* check close_lru for replay */
dd453dfd 3121 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3122 close->cl_seqid,
1da177e4 3123 &close->cl_stateid,
f3362737 3124 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 3125 &close->cl_stateowner, &stp, NULL)))
3126 goto out;
1da177e4
LT		 3127 status = nfs_ok;
3128 update_stateid(&stp->st_stateid);
3129 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3130
04ef5954 3131 /* release_stateid() calls nfsd_close() if needed */
2283963f 3132 release_open_stateid(stp);
04ef5954
BF		 3133
3134 /* place unused nfs4_stateowners on so_close_lru list to be
3135 * released by the laundromat service after the lease period
3136 * to enable us to handle CLOSE replay
3137 */
3138 if (list_empty(&close->cl_stateowner->so_stateids))
3139 move_to_close_lru(close->cl_stateowner);
1da177e4 3140out:
f2327d9a 3141 if (close->cl_stateowner) {
1da177e4 3142 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 3143 cstate->replay_owner = close->cl_stateowner;
f2327d9a 3144 }
1da177e4
LT		 3145 nfs4_unlock_state();
3146 return status;
3147}
3148
b37ad28b 3149__be32
ca364317
BF		 3150nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3151 struct nfsd4_delegreturn *dr)
1da177e4 3152{
203a8c8e
BF		 3153 struct nfs4_delegation *dp;
3154 stateid_t *stateid = &dr->dr_stateid;
3155 struct inode *inode;
b37ad28b 3156 __be32 status;
6668958f 3157 int flags = 0;
1da177e4 3158
ca364317 3159 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 3160 return status;
3161 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4 3162
6668958f
AA		 3163 if (nfsd4_has_session(cstate))
3164 flags |= HAS_SESSION;
1da177e4 3165 nfs4_lock_state();
203a8c8e
BF		 3166 status = nfserr_bad_stateid;
3167 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3168 goto out;
3169 status = nfserr_stale_stateid;
3170 if (STALE_STATEID(stateid))
3171 goto out;
7e0f7cf5 3172 status = nfserr_bad_stateid;
203a8c8e
BF		 3173 if (!is_delegation_stateid(stateid))
3174 goto out;
203a8c8e 3175 dp = find_delegation_stateid(inode, stateid);
78155ed7
BN		 3176 if (!dp) {
3177 status = stateid_error_map(stateid);
203a8c8e 3178 goto out;
78155ed7 3179 }
6668958f 3180 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
203a8c8e
BF		 3181 if (status)
3182 goto out;
3183 renew_client(dp->dl_client);
3184
3185 unhash_delegation(dp);
1da177e4 3186out:
203a8c8e
BF		 3187 nfs4_unlock_state();
3188
1da177e4
LT		 3189 return status;
3190}
3191
3192
3193/*
3194 * Lock owner state (byte-range locks)
3195 */
3196#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3197#define LOCK_HASH_BITS 8
3198#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3199#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3200
87df4de8
BH		 3201static inline u64
3202end_offset(u64 start, u64 len)
3203{
3204 u64 end;
3205
3206 end = start + len;
3207 return end >= start ? end: NFS4_MAX_UINT64;
3208}
3209
3210/* last octet in a range */
3211static inline u64
3212last_byte_offset(u64 start, u64 len)
3213{
3214 u64 end;
3215
3216 BUG_ON(!len);
3217 end = start + len;
3218 return end > start ? end - 1: NFS4_MAX_UINT64;
3219}
3220
1da177e4
LT		 3221#define lockownerid_hashval(id) \
3222 ((id) & LOCK_HASH_MASK)
3223
3224static inline unsigned int
3225lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3226 struct xdr_netobj *ownername)
3227{
3228 return (file_hashval(inode) + cl_id
3229 + opaque_hashval(ownername->data, ownername->len))
3230 & LOCK_HASH_MASK;
3231}
3232
3233static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3234static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3235static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3236
fd39ca9a 3237static struct nfs4_stateid *
1da177e4
LT		 3238find_stateid(stateid_t *stid, int flags)
3239{
9346eff0 3240 struct nfs4_stateid *local;
1da177e4
LT		 3241 u32 st_id = stid->si_stateownerid;
3242 u32 f_id = stid->si_fileid;
3243 unsigned int hashval;
3244
3245 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 3246 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3247 hashval = stateid_hashval(st_id, f_id);
3248 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3249 if ((local->st_stateid.si_stateownerid == st_id) &&
3250 (local->st_stateid.si_fileid == f_id))
3251 return local;
3252 }
3253 }
9346eff0
KK		 3254
3255 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3256 hashval = stateid_hashval(st_id, f_id);
3257 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3258 if ((local->st_stateid.si_stateownerid == st_id) &&
3259 (local->st_stateid.si_fileid == f_id))
3260 return local;
3261 }
849823c5 3262 }
1da177e4
LT		 3263 return NULL;
3264}
3265
3266static struct nfs4_delegation *
3267find_delegation_stateid(struct inode *ino, stateid_t *stid)
3268{
13cd2184
N		 3269 struct nfs4_file *fp;
3270 struct nfs4_delegation *dl;
1da177e4
LT		 3271
3272 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
3273 stid->si_boot, stid->si_stateownerid,
3274 stid->si_fileid, stid->si_generation);
3275
1da177e4 3276 fp = find_file(ino);
13cd2184
N		 3277 if (!fp)
3278 return NULL;
3279 dl = find_delegation_file(fp, stid);
3280 put_nfs4_file(fp);
3281 return dl;
1da177e4
LT		 3282}
3283
3284/*
3285 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3286 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3287 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3288 * locking, this prevents us from being completely protocol-compliant. The
3289 * real solution to this problem is to start using unsigned file offsets in
3290 * the VFS, but this is a very deep change!
3291 */
3292static inline void
3293nfs4_transform_lock_offset(struct file_lock *lock)
3294{
3295 if (lock->fl_start < 0)
3296 lock->fl_start = OFFSET_MAX;
3297 if (lock->fl_end < 0)
3298 lock->fl_end = OFFSET_MAX;
3299}
3300
d5b9026a
N		 3301/* Hack!: For now, we're defining this just so we can use a pointer to it
3302 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 3303static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 3304};
1da177e4
LT		 3305
3306static inline void
3307nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3308{
d5b9026a
N		 3309 struct nfs4_stateowner *sop;
3310 unsigned int hval;
1da177e4 3311
d5b9026a
N		 3312 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3313 sop = (struct nfs4_stateowner *) fl->fl_owner;
3314 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 3315 kref_get(&sop->so_ref);
3316 deny->ld_sop = sop;
3317 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 3318 } else {
3319 deny->ld_sop = NULL;
3320 deny->ld_clientid.cl_boot = 0;
3321 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 3322 }
3323 deny->ld_start = fl->fl_start;
87df4de8
BH		 3324 deny->ld_length = NFS4_MAX_UINT64;
3325 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 3326 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3327 deny->ld_type = NFS4_READ_LT;
3328 if (fl->fl_type != F_RDLCK)
3329 deny->ld_type = NFS4_WRITE_LT;
3330}
3331
1da177e4
LT		 3332static struct nfs4_stateowner *
3333find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3334 struct xdr_netobj *owner)
3335{
3336 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3337 struct nfs4_stateowner *op;
3338
3339 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 3340 if (same_owner_str(op, owner, clid))
1da177e4
LT		 3341 return op;
3342 }
3343 return NULL;
3344}
3345
3346/*
3347 * Alloc a lock owner structure.
3348 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3349 * occured.
3350 *
3351 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 3352 */
3353
3354static struct nfs4_stateowner *
3355alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3356 struct nfs4_stateowner *sop;
3357 struct nfs4_replay *rp;
3358 unsigned int idhashval;
3359
3360 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3361 return NULL;
3362 idhashval = lockownerid_hashval(current_ownerid);
3363 INIT_LIST_HEAD(&sop->so_idhash);
3364 INIT_LIST_HEAD(&sop->so_strhash);
3365 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 3366 INIT_LIST_HEAD(&sop->so_stateids);
3367 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 3368 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3369 sop->so_time = 0;
3370 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3371 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 3372 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 3373 sop->so_is_open_owner = 0;
3374 sop->so_id = current_ownerid++;
3375 sop->so_client = clp;
b59e3c0e
NB		 3376 /* It is the openowner seqid that will be incremented in encode in the
3377 * case of new lockowners; so increment the lock seqid manually: */
3378 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 3379 sop->so_confirmed = 1;
3380 rp = &sop->so_replay;
de1ae286 3381 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 3382 rp->rp_buflen = 0;
3383 rp->rp_buf = rp->rp_ibuf;
3384 return sop;
3385}
3386
fd39ca9a 3387static struct nfs4_stateid *
1da177e4
LT		 3388alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3389{
3390 struct nfs4_stateid *stp;
3391 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3392
5ac049ac
N		 3393 stp = nfs4_alloc_stateid();
3394 if (stp == NULL)
1da177e4
LT		 3395 goto out;
3396 INIT_LIST_HEAD(&stp->st_hash);
3397 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 3398 INIT_LIST_HEAD(&stp->st_perstateowner);
3399 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 3400 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 3401 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 3402 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 3403 stp->st_stateowner = sop;
13cd2184 3404 get_nfs4_file(fp);
1da177e4 3405 stp->st_file = fp;
78155ed7 3406 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 3407 stp->st_stateid.si_stateownerid = sop->so_id;
3408 stp->st_stateid.si_fileid = fp->fi_id;
3409 stp->st_stateid.si_generation = 0;
3410 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
3411 stp->st_access_bmap = open_stp->st_access_bmap;
3412 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 3413 stp->st_openstp = open_stp;
1da177e4
LT		 3414
3415out:
3416 return stp;
3417}
3418
fd39ca9a 3419static int
1da177e4
LT		 3420check_lock_length(u64 offset, u64 length)
3421{
87df4de8 3422 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3423 LOFF_OVERFLOW(offset, length)));
3424}
3425
3426/*
3427 * LOCK operation
3428 */
b37ad28b 3429__be32
ca364317 3430nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3431 struct nfsd4_lock *lock)
1da177e4 3432{
3e9e3dbe 3433 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3434 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3435 struct nfs4_stateid *lock_stp;
3436 struct file *filp;
3437 struct file_lock file_lock;
8dc7c311 3438 struct file_lock conflock;
b37ad28b 3439 __be32 status = 0;
1da177e4 3440 unsigned int strhashval;
150b3934 3441 unsigned int cmd;
b8dd7b9a 3442 int err;
1da177e4
LT		 3443
3444 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3445 (long long) lock->lk_offset,
3446 (long long) lock->lk_length);
3447
1da177e4
LT		 3448 if (check_lock_length(lock->lk_offset, lock->lk_length))
3449 return nfserr_inval;
3450
ca364317 3451 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3452 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3453 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3454 return status;
3455 }
3456
1da177e4
LT		 3457 nfs4_lock_state();
3458
3459 if (lock->lk_is_new) {
893f8770
N		 3460 /*
3461 * Client indicates that this is a new lockowner.
3462 * Use open owner and open stateid to create lock owner and
3463 * lock stateid.
3464 */
1da177e4
LT		 3465 struct nfs4_stateid *open_stp = NULL;
3466 struct nfs4_file *fp;
3467
3468 status = nfserr_stale_clientid;
60adfc50
AA		 3469 if (!nfsd4_has_session(cstate) &&
3470 STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3471 goto out;
1da177e4 3472
1da177e4 3473 /* validate and update open stateid and open seqid */
dd453dfd 3474 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3475 lock->lk_new_open_seqid,
3476 &lock->lk_new_open_stateid,
f3362737 3477 OPEN_STATE,
3a65588a 3478 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3479 lock);
37515177 3480 if (status)
1da177e4 3481 goto out;
3a65588a 3482 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3483 /* create lockowner and lock stateid */
3484 fp = open_stp->st_file;
3485 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3486 open_sop->so_client->cl_clientid.cl_id,
3487 &lock->v.new.owner);
3e9e3dbe
N		 3488 /* XXX: Do we need to check for duplicate stateowners on
3489 * the same file, or should they just be allowed (and
3490 * create new stateids)? */
1da177e4 3491 status = nfserr_resource;
b59e3c0e
NB		 3492 lock_sop = alloc_init_lock_stateowner(strhashval,
3493 open_sop->so_client, open_stp, lock);
3494 if (lock_sop == NULL)
1da177e4 3495 goto out;
b59e3c0e 3496 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3497 if (lock_stp == NULL)
1da177e4 3498 goto out;
1da177e4
LT		 3499 } else {
3500 /* lock (lock owner + lock stateid) already exists */
dd453dfd 3501 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3502 lock->lk_old_lock_seqid,
3503 &lock->lk_old_lock_stateid,
f3362737 3504 LOCK_STATE,
3a65588a 3505 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3506 if (status)
3507 goto out;
3a65588a 3508 lock_sop = lock->lk_replay_owner;
1da177e4 3509 }
3a65588a 3510 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3511 filp = lock_stp->st_vfs_file;
3512
0dd395dc 3513 status = nfserr_grace;
af558e33 3514 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3515 goto out;
3516 status = nfserr_no_grace;
af558e33 3517 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3518 goto out;
3519
1da177e4
LT		 3520 locks_init_lock(&file_lock);
3521 switch (lock->lk_type) {
3522 case NFS4_READ_LT:
3523 case NFS4_READW_LT:
3524 file_lock.fl_type = F_RDLCK;
150b3934 3525 cmd = F_SETLK;
1da177e4
LT		 3526 break;
3527 case NFS4_WRITE_LT:
3528 case NFS4_WRITEW_LT:
3529 file_lock.fl_type = F_WRLCK;
150b3934 3530 cmd = F_SETLK;
1da177e4
LT		 3531 break;
3532 default:
3533 status = nfserr_inval;
3534 goto out;
3535 }
b59e3c0e 3536 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3537 file_lock.fl_pid = current->tgid;
3538 file_lock.fl_file = filp;
3539 file_lock.fl_flags = FL_POSIX;
d5b9026a 3540 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3541
3542 file_lock.fl_start = lock->lk_offset;
87df4de8 3543 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3544 nfs4_transform_lock_offset(&file_lock);
3545
3546 /*
3547 * Try to lock the file in the VFS.
3548 * Note: locks.c uses the BKL to protect the inode's lock list.
3549 */
3550
fd85b817 3551 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3552 switch (-err) {
1da177e4
LT		 3553 case 0: /* success! */
3554 update_stateid(&lock_stp->st_stateid);
3555 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3556 sizeof(stateid_t));
b8dd7b9a 3557 status = 0;
eb76b3fd
AA		 3558 break;
3559 case (EAGAIN): /* conflock holds conflicting lock */
3560 status = nfserr_denied;
3561 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3562 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3563 break;
1da177e4
LT		 3564 case (EDEADLK):
3565 status = nfserr_deadlock;
eb76b3fd 3566 break;
1da177e4 3567 default:
fd85b817 3568 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3569 status = nfserr_resource;
3570 break;
1da177e4 3571 }
1da177e4 3572out:
8a280510 3573 if (status && lock->lk_is_new && lock_sop)
f044ff83 3574 release_lockowner(lock_sop);
3a65588a
BF		 3575 if (lock->lk_replay_owner) {
3576 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3577 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3578 }
1da177e4
LT		 3579 nfs4_unlock_state();
3580 return status;
3581}
3582
55ef1274
BF		 3583/*
3584 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3585 * so we do a temporary open here just to get an open file to pass to
3586 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3587 * inode operation.)
3588 */
3589static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3590{
3591 struct file *file;
3592 int err;
3593
3594 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3595 if (err)
3596 return err;
3597 err = vfs_test_lock(file, lock);
3598 nfsd_close(file);
3599 return err;
3600}
3601
1da177e4
LT		 3602/*
3603 * LOCKT operation
3604 */
b37ad28b 3605__be32
ca364317
BF		 3606nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3607 struct nfsd4_lockt *lockt)
1da177e4
LT		 3608{
3609 struct inode *inode;
1da177e4 3610 struct file_lock file_lock;
fd85b817 3611 int error;
b37ad28b 3612 __be32 status;
1da177e4 3613
af558e33 3614 if (locks_in_grace())
1da177e4
LT		 3615 return nfserr_grace;
3616
3617 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3618 return nfserr_inval;
3619
3620 lockt->lt_stateowner = NULL;
3621 nfs4_lock_state();
3622
3623 status = nfserr_stale_clientid;
60adfc50 3624 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3625 goto out;
1da177e4 3626
ca364317 3627 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3628 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3629 if (status == nfserr_symlink)
3630 status = nfserr_inval;
3631 goto out;
3632 }
3633
ca364317 3634 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3635 locks_init_lock(&file_lock);
3636 switch (lockt->lt_type) {
3637 case NFS4_READ_LT:
3638 case NFS4_READW_LT:
3639 file_lock.fl_type = F_RDLCK;
3640 break;
3641 case NFS4_WRITE_LT:
3642 case NFS4_WRITEW_LT:
3643 file_lock.fl_type = F_WRLCK;
3644 break;
3645 default:
2fdada03 3646 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3647 status = nfserr_inval;
3648 goto out;
3649 }
3650
3651 lockt->lt_stateowner = find_lockstateowner_str(inode,
3652 &lockt->lt_clientid, &lockt->lt_owner);
3653 if (lockt->lt_stateowner)
3654 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3655 file_lock.fl_pid = current->tgid;
3656 file_lock.fl_flags = FL_POSIX;
3657
3658 file_lock.fl_start = lockt->lt_offset;
87df4de8 3659 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3660
3661 nfs4_transform_lock_offset(&file_lock);
3662
1da177e4 3663 status = nfs_ok;
55ef1274 3664 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3665 if (error) {
3666 status = nfserrno(error);
3667 goto out;
3668 }
9d6a8c5c 3669 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3670 status = nfserr_denied;
9d6a8c5c 3671 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3672 }
3673out:
3674 nfs4_unlock_state();
3675 return status;
3676}
3677
b37ad28b 3678__be32
ca364317 3679nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3680 struct nfsd4_locku *locku)
1da177e4
LT		 3681{
3682 struct nfs4_stateid *stp;
3683 struct file *filp = NULL;
3684 struct file_lock file_lock;
b37ad28b 3685 __be32 status;
b8dd7b9a 3686 int err;
1da177e4
LT		 3687
3688 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3689 (long long) locku->lu_offset,
3690 (long long) locku->lu_length);
3691
3692 if (check_lock_length(locku->lu_offset, locku->lu_length))
3693 return nfserr_inval;
3694
3695 nfs4_lock_state();
3696
dd453dfd 3697 if ((status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3698 locku->lu_seqid,
3699 &locku->lu_stateid,
f3362737 3700 LOCK_STATE,
1da177e4
LT		 3701 &locku->lu_stateowner, &stp, NULL)))
3702 goto out;
3703
3704 filp = stp->st_vfs_file;
3705 BUG_ON(!filp);
3706 locks_init_lock(&file_lock);
3707 file_lock.fl_type = F_UNLCK;
3708 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3709 file_lock.fl_pid = current->tgid;
3710 file_lock.fl_file = filp;
3711 file_lock.fl_flags = FL_POSIX;
d5b9026a 3712 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3713 file_lock.fl_start = locku->lu_offset;
3714
87df4de8 3715 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3716 nfs4_transform_lock_offset(&file_lock);
3717
3718 /*
3719 * Try to unlock the file in the VFS.
3720 */
fd85b817 3721 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3722 if (err) {
fd85b817 3723 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3724 goto out_nfserr;
3725 }
3726 /*
3727 * OK, unlock succeeded; the only thing left to do is update the stateid.
3728 */
3729 update_stateid(&stp->st_stateid);
3730 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3731
3732out:
f2327d9a 3733 if (locku->lu_stateowner) {
1da177e4 3734 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3735 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3736 }
1da177e4
LT		 3737 nfs4_unlock_state();
3738 return status;
3739
3740out_nfserr:
b8dd7b9a 3741 status = nfserrno(err);
1da177e4
LT		 3742 goto out;
3743}
3744
3745/*
3746 * returns
3747 * 1: locks held by lockowner
3748 * 0: no locks held by lockowner
3749 */
3750static int
3751check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3752{
3753 struct file_lock **flpp;
7eaa36e2 3754 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3755 int status = 0;
3756
3757 lock_kernel();
3758 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3759 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3760 status = 1;
3761 goto out;
796dadfd 3762 }
1da177e4
LT		 3763 }
3764out:
3765 unlock_kernel();
3766 return status;
3767}
3768
b37ad28b 3769__be32
b591480b
BF		 3770nfsd4_release_lockowner(struct svc_rqst *rqstp,
3771 struct nfsd4_compound_state *cstate,
3772 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3773{
3774 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3775 struct nfs4_stateowner *sop;
3776 struct nfs4_stateid *stp;
1da177e4 3777 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3778 struct list_head matches;
3779 int i;
b37ad28b 3780 __be32 status;
1da177e4
LT		 3781
3782 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3783 clid->cl_boot, clid->cl_id);
3784
3785 /* XXX check for lease expiration */
3786
3787 status = nfserr_stale_clientid;
849823c5 3788 if (STALE_CLIENTID(clid))
1da177e4 3789 return status;
1da177e4
LT		 3790
3791 nfs4_lock_state();
3792
3e9e3dbe
N		 3793 status = nfserr_locks_held;
3794 /* XXX: we're doing a linear search through all the lockowners.
3795 * Yipes! For now we'll just hope clients aren't really using
3796 * release_lockowner much, but eventually we have to fix these
3797 * data structures. */
3798 INIT_LIST_HEAD(&matches);
3799 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3800 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3801 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3802 continue;
3803 list_for_each_entry(stp, &sop->so_stateids,
3804 st_perstateowner) {
3805 if (check_for_locks(stp->st_vfs_file, sop))
3806 goto out;
3807 /* Note: so_perclient unused for lockowners,
3808 * so it's OK to fool with here. */
3809 list_add(&sop->so_perclient, &matches);
3810 }
1da177e4 3811 }
3e9e3dbe
N		 3812 }
3813 /* Clients probably won't expect us to return with some (but not all)
3814 * of the lockowner state released; so don't release any until all
3815 * have been checked. */
3816 status = nfs_ok;
0fa822e4
N		 3817 while (!list_empty(&matches)) {
3818 sop = list_entry(matches.next, struct nfs4_stateowner,
3819 so_perclient);
3820 /* unhash_stateowner deletes so_perclient only
3821 * for openowners. */
3822 list_del(&sop->so_perclient);
f044ff83 3823 release_lockowner(sop);
1da177e4
LT		 3824 }
3825out:
3826 nfs4_unlock_state();
3827 return status;
3828}
3829
3830static inline struct nfs4_client_reclaim *
a55370a3 3831alloc_reclaim(void)
1da177e4 3832{
a55370a3 3833 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3834}
3835
c7b9a459 3836int
a1bcecd2 3837nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3838{
3839 unsigned int strhashval = clientstr_hashval(name);
3840 struct nfs4_client *clp;
3841
a1bcecd2 3842 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3843 return clp ? 1 : 0;
3844}
3845
1da177e4
LT		 3846/*
3847 * failure => all reset bets are off, nfserr_no_grace...
3848 */
190e4fbf
N		 3849int
3850nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3851{
3852 unsigned int strhashval;
3853 struct nfs4_client_reclaim *crp = NULL;
3854
a55370a3
N		 3855 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3856 crp = alloc_reclaim();
1da177e4
LT		 3857 if (!crp)
3858 return 0;
a55370a3 3859 strhashval = clientstr_hashval(name);
1da177e4
LT		 3860 INIT_LIST_HEAD(&crp->cr_strhash);
3861 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3862 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3863 reclaim_str_hashtbl_size++;
3864 return 1;
3865}
3866
3867static void
3868nfs4_release_reclaim(void)
3869{
3870 struct nfs4_client_reclaim *crp = NULL;
3871 int i;
3872
1da177e4
LT		 3873 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3874 while (!list_empty(&reclaim_str_hashtbl[i])) {
3875 crp = list_entry(reclaim_str_hashtbl[i].next,
3876 struct nfs4_client_reclaim, cr_strhash);
3877 list_del(&crp->cr_strhash);
1da177e4
LT		 3878 kfree(crp);
3879 reclaim_str_hashtbl_size--;
3880 }
3881 }
3882 BUG_ON(reclaim_str_hashtbl_size);
3883}
3884
3885/*
3886 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3887static struct nfs4_client_reclaim *
1da177e4
LT		 3888nfs4_find_reclaim_client(clientid_t *clid)
3889{
3890 unsigned int strhashval;
3891 struct nfs4_client *clp;
3892 struct nfs4_client_reclaim *crp = NULL;
3893
3894
3895 /* find clientid in conf_id_hashtbl */
3896 clp = find_confirmed_client(clid);
3897 if (clp == NULL)
3898 return NULL;
3899
a55370a3
N		 3900 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3901 clp->cl_name.len, clp->cl_name.data,
3902 clp->cl_recdir);
1da177e4
LT		 3903
3904 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3905 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3906 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3907 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3908 return crp;
3909 }
3910 }
3911 return NULL;
3912}
3913
3914/*
3915* Called from OPEN. Look for clientid in reclaim list.
3916*/
b37ad28b 3917__be32
1da177e4
LT		 3918nfs4_check_open_reclaim(clientid_t *clid)
3919{
dfc83565 3920 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3921}
3922
ac4d8ff2 3923/* initialization to perform at module load time: */
1da177e4 3924
e8ff2a84 3925int
ac4d8ff2 3926nfs4_state_init(void)
1da177e4 3927{
e8ff2a84 3928 int i, status;
1da177e4 3929
e8ff2a84
BF		 3930 status = nfsd4_init_slabs();
3931 if (status)
3932 return status;
1da177e4
LT		 3933 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3934 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3935 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3936 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3937 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
02cb2858 3938 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
1da177e4 3939 }
5282fd72
ME		 3940 for (i = 0; i < SESSION_HASH_SIZE; i++)
3941 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3942 for (i = 0; i < FILE_HASH_SIZE; i++) {
3943 INIT_LIST_HEAD(&file_hashtbl[i]);
3944 }
3945 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3946 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3947 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3948 }
3949 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3950 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3951 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3952 }
3953 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3954 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3955 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3956 }
1da177e4 3957 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3958 INIT_LIST_HEAD(&close_lru);
3959 INIT_LIST_HEAD(&client_lru);
3960 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2 3961 reclaim_str_hashtbl_size = 0;
e8ff2a84 3962 return 0;
ac4d8ff2
N		 3963}
3964
190e4fbf
N		 3965static void
3966nfsd4_load_reboot_recovery_data(void)
3967{
3968 int status;
3969
0964a3d3
N		 3970 nfs4_lock_state();
3971 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3972 status = nfsd4_recdir_load();
0964a3d3 3973 nfs4_unlock_state();
190e4fbf
N		 3974 if (status)
3975 printk("NFSD: Failure reading reboot recovery data\n");
3976}
3977
9a8db97e
ME		 3978unsigned long
3979get_nfs4_grace_period(void)
3980{
3981 return max(user_lease_time, lease_time) * HZ;
3982}
3983
c2f1a551
MS		 3984/*
3985 * Since the lifetime of a delegation isn't limited to that of an open, a
3986 * client may quite reasonably hang on to a delegation as long as it has
3987 * the inode cached. This becomes an obvious problem the first time a
3988 * client's inode cache approaches the size of the server's total memory.
3989 *
3990 * For now we avoid this problem by imposing a hard limit on the number
3991 * of delegations, which varies according to the server's memory size.
3992 */
3993static void
3994set_max_delegations(void)
3995{
3996 /*
3997 * Allow at most 4 delegations per megabyte of RAM. Quick
3998 * estimates suggest that in the worst case (where every delegation
3999 * is for a different inode), a delegation could take about 1.5K,
4000 * giving a worst case usage of about 6% of memory.
4001 */
4002 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4003}
4004
ac4d8ff2
N		 4005/* initialization to perform when the nfsd service is started: */
4006
4007static void
4008__nfs4_state_start(void)
4009{
9a8db97e 4010 unsigned long grace_time;
ac4d8ff2 4011
1da177e4 4012 boot_time = get_seconds();
af558e33 4013 grace_time = get_nfs4_grace_period();
d99a05ad 4014 lease_time = user_lease_time;
af558e33 4015 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 4016 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4017 grace_time/HZ);
58da282b 4018 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 4019 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 4020 set_max_delegations();
1da177e4
LT		 4021}
4022
e8ff2a84 4023void
76a3550e 4024nfs4_state_start(void)
1da177e4 4025{
1da177e4 4026 if (nfs4_init)
e8ff2a84 4027 return;
190e4fbf 4028 nfsd4_load_reboot_recovery_data();
76a3550e 4029 __nfs4_state_start();
1da177e4 4030 nfs4_init = 1;
e8ff2a84 4031 return;
1da177e4
LT		 4032}
4033
1da177e4
LT		 4034time_t
4035nfs4_lease_time(void)
4036{
4037 return lease_time;
4038}
4039
4040static void
4041__nfs4_state_shutdown(void)
4042{
4043 int i;
4044 struct nfs4_client *clp = NULL;
4045 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 4046 struct list_head *pos, *next, reaplist;
4047
1da177e4
LT		 4048 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4049 while (!list_empty(&conf_id_hashtbl[i])) {
4050 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4051 expire_client(clp);
4052 }
4053 while (!list_empty(&unconf_str_hashtbl[i])) {
4054 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4055 expire_client(clp);
4056 }
4057 }
4058 INIT_LIST_HEAD(&reaplist);
4059 spin_lock(&recall_lock);
4060 list_for_each_safe(pos, next, &del_recall_lru) {
4061 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4062 list_move(&dp->dl_recall_lru, &reaplist);
4063 }
4064 spin_unlock(&recall_lock);
4065 list_for_each_safe(pos, next, &reaplist) {
4066 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4067 list_del_init(&dp->dl_recall_lru);
4068 unhash_delegation(dp);
4069 }
4070
190e4fbf 4071 nfsd4_shutdown_recdir();
1da177e4 4072 nfs4_init = 0;
1da177e4
LT		 4073}
4074
4075void
4076nfs4_state_shutdown(void)
4077{
5e8d5c29
N		 4078 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4079 destroy_workqueue(laundry_wq);
2c5e7615 4080 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 4081 nfs4_lock_state();
4082 nfs4_release_reclaim();
4083 __nfs4_state_shutdown();
1da177e4
LT		 4084 nfs4_unlock_state();
4085}
4086
3dd98a3b
JL		 4087/*
4088 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4089 * accessed when nfsd is starting.
4090 */
0964a3d3
N		 4091static void
4092nfs4_set_recdir(char *recdir)
4093{
0964a3d3 4094 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 4095}
4096
4097/*
4098 * Change the NFSv4 recovery directory to recdir.
4099 */
4100int
4101nfs4_reset_recoverydir(char *recdir)
4102{
4103 int status;
a63bb996 4104 struct path path;
0964a3d3 4105
a63bb996 4106 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 4107 if (status)
4108 return status;
4109 status = -ENOTDIR;
a63bb996 4110 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 4111 nfs4_set_recdir(recdir);
4112 status = 0;
4113 }
a63bb996 4114 path_put(&path);
0964a3d3
N		 4115 return status;
4116}
4117
3dd98a3b
JL		 4118char *
4119nfs4_recoverydir(void)
4120{
4121 return user_recovery_dirname;
4122}
4123
1da177e4
LT		 4124/*
4125 * Called when leasetime is changed.
4126 *
d99a05ad
N		 4127 * The only way the protocol gives us to handle on-the-fly lease changes is to
4128 * simulate a reboot. Instead of doing that, we just wait till the next time
4129 * we start to register any changes in lease time. If the administrator
4130 * really wants to change the lease time *now*, they can go ahead and bring
4131 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 4132 *
4133 * user_lease_time is protected by nfsd_mutex since it's only really accessed
4134 * when nfsd is starting
1da177e4
LT		 4135 */
4136void
4137nfs4_reset_lease(time_t leasetime)
4138{
d99a05ad 4139 user_lease_time = leasetime;
1da177e4 4140}
Linux 6.x block layer and io_uring tree(s)