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nfsd4: don't sleep in lease-break callback
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4 1/*
1da177e4
LT		 2* Copyright (c) 2001 The Regents of the University of Michigan.
3* All rights reserved.
4*
5* Kendrick Smith <kmsmith@umich.edu>
6* Andy Adamson <kandros@umich.edu>
7*
8* Redistribution and use in source and binary forms, with or without
9* modification, are permitted provided that the following conditions
10* are met:
11*
12* 1. Redistributions of source code must retain the above copyright
13* notice, this list of conditions and the following disclaimer.
14* 2. Redistributions in binary form must reproduce the above copyright
15* notice, this list of conditions and the following disclaimer in the
16* documentation and/or other materials provided with the distribution.
17* 3. Neither the name of the University nor the names of its
18* contributors may be used to endorse or promote products derived
19* from this software without specific prior written permission.
20*
21* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32*
33*/
34
aceaf78d 35#include <linux/file.h>
1da177e4 36#include <linux/smp_lock.h>
0964a3d3 37#include <linux/namei.h>
c2f1a551 38#include <linux/swap.h>
68e76ad0 39#include <linux/sunrpc/svcauth_gss.h>
363168b4 40#include <linux/sunrpc/clnt.h>
9a74af21 41#include "xdr4.h"
0a3adade 42#include "vfs.h"
1da177e4
LT		 43
44#define NFSDDBG_FACILITY NFSDDBG_PROC
45
46/* Globals */
cf07d2ea 47time_t nfsd4_lease = 90; /* default lease time */
efc4bb4f 48time_t nfsd4_grace = 90;
fd39ca9a 49static time_t boot_time;
1da177e4
LT		 50static u32 current_ownerid = 1;
51static u32 current_fileid = 1;
52static u32 current_delegid = 1;
53static u32 nfs4_init;
fd39ca9a
N		 54static stateid_t zerostateid; /* bits all 0 */
55static stateid_t onestateid; /* bits all 1 */
ec6b5d7b 56static u64 current_sessionid = 1;
fd39ca9a
N		 57
58#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
59#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 60
1da177e4 61/* forward declarations */
fd39ca9a 62static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 63static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 64static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
65static void nfs4_set_recdir(char *recdir);
1da177e4 66
8b671b80
BF		 67/* Locking: */
68
69/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 70static DEFINE_MUTEX(client_mutex);
1da177e4 71
8b671b80
BF		 72/*
73 * Currently used for the del_recall_lru and file hash table. In an
74 * effort to decrease the scope of the client_mutex, this spinlock may
75 * eventually cover more:
76 */
77static DEFINE_SPINLOCK(recall_lock);
78
e18b890b
CL		 79static struct kmem_cache *stateowner_slab = NULL;
80static struct kmem_cache *file_slab = NULL;
81static struct kmem_cache *stateid_slab = NULL;
82static struct kmem_cache *deleg_slab = NULL;
e60d4398 83
1da177e4
LT		 84void
85nfs4_lock_state(void)
86{
353ab6e9 87 mutex_lock(&client_mutex);
1da177e4
LT		 88}
89
90void
91nfs4_unlock_state(void)
92{
353ab6e9 93 mutex_unlock(&client_mutex);
1da177e4
LT		 94}
95
96static inline u32
97opaque_hashval(const void *ptr, int nbytes)
98{
99 unsigned char *cptr = (unsigned char *) ptr;
100
101 u32 x = 0;
102 while (nbytes--) {
103 x *= 37;
104 x += *cptr++;
105 }
106 return x;
107}
108
1da177e4
LT		 109static struct list_head del_recall_lru;
110
13cd2184
N		 111static inline void
112put_nfs4_file(struct nfs4_file *fi)
113{
8b671b80
BF		 114 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
115 list_del(&fi->fi_hash);
116 spin_unlock(&recall_lock);
117 iput(fi->fi_inode);
118 kmem_cache_free(file_slab, fi);
119 }
13cd2184
N		 120}
121
122static inline void
123get_nfs4_file(struct nfs4_file *fi)
124{
8b671b80 125 atomic_inc(&fi->fi_ref);
13cd2184
N		 126}
127
ef0f3390 128static int num_delegations;
c2f1a551 129unsigned int max_delegations;
ef0f3390
N		 130
131/*
132 * Open owner state (share locks)
133 */
134
135/* hash tables for nfs4_stateowner */
136#define OWNER_HASH_BITS 8
137#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
138#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
139
140#define ownerid_hashval(id) \
141 ((id) & OWNER_HASH_MASK)
142#define ownerstr_hashval(clientid, ownername) \
143 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
144
145static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
146static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
147
148/* hash table for nfs4_file */
149#define FILE_HASH_BITS 8
150#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
151#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
152/* hash table for (open)nfs4_stateid */
153#define STATEID_HASH_BITS 10
154#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
155#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
156
157#define file_hashval(x) \
158 hash_ptr(x, FILE_HASH_BITS)
159#define stateid_hashval(owner_id, file_id) \
160 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
161
162static struct list_head file_hashtbl[FILE_HASH_SIZE];
163static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
164
1da177e4
LT		 165static struct nfs4_delegation *
166alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
167{
168 struct nfs4_delegation *dp;
169 struct nfs4_file *fp = stp->st_file;
c237dc03 170 struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
1da177e4
LT		 171
172 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 173 if (fp->fi_had_conflict)
174 return NULL;
c2f1a551 175 if (num_delegations > max_delegations)
ef0f3390 176 return NULL;
5b2d21c1
N		 177 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
178 if (dp == NULL)
1da177e4 179 return dp;
ef0f3390 180 num_delegations++;
ea1da636
N		 181 INIT_LIST_HEAD(&dp->dl_perfile);
182 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 183 INIT_LIST_HEAD(&dp->dl_recall_lru);
184 dp->dl_client = clp;
13cd2184 185 get_nfs4_file(fp);
1da177e4
LT		 186 dp->dl_file = fp;
187 dp->dl_flock = NULL;
188 get_file(stp->st_vfs_file);
189 dp->dl_vfs_file = stp->st_vfs_file;
190 dp->dl_type = type;
b53d40c5 191 dp->dl_ident = cb->cb_ident;
78155ed7 192 dp->dl_stateid.si_boot = get_seconds();
1da177e4
LT		 193 dp->dl_stateid.si_stateownerid = current_delegid++;
194 dp->dl_stateid.si_fileid = 0;
195 dp->dl_stateid.si_generation = 0;
6c02eaa1 196 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 197 dp->dl_time = 0;
198 atomic_set(&dp->dl_count, 1);
ea1da636
N		 199 list_add(&dp->dl_perfile, &fp->fi_delegations);
200 list_add(&dp->dl_perclnt, &clp->cl_delegations);
b5a1a81e 201 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
1da177e4
LT		 202 return dp;
203}
204
205void
206nfs4_put_delegation(struct nfs4_delegation *dp)
207{
208 if (atomic_dec_and_test(&dp->dl_count)) {
209 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 210 put_nfs4_file(dp->dl_file);
5b2d21c1 211 kmem_cache_free(deleg_slab, dp);
ef0f3390 212 num_delegations--;
1da177e4
LT		 213 }
214}
215
216/* Remove the associated file_lock first, then remove the delegation.
217 * lease_modify() is called to remove the FS_LEASE file_lock from
218 * the i_flock list, eventually calling nfsd's lock_manager
219 * fl_release_callback.
220 */
221static void
222nfs4_close_delegation(struct nfs4_delegation *dp)
223{
224 struct file *filp = dp->dl_vfs_file;
225
226 dprintk("NFSD: close_delegation dp %p\n",dp);
227 dp->dl_vfs_file = NULL;
228 /* The following nfsd_close may not actually close the file,
229 * but we want to remove the lease in any case. */
c907132d 230 if (dp->dl_flock)
a9933cea 231 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 232 nfsd_close(filp);
1da177e4
LT		 233}
234
235/* Called under the state lock. */
236static void
237unhash_delegation(struct nfs4_delegation *dp)
238{
ea1da636
N		 239 list_del_init(&dp->dl_perfile);
240 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 241 spin_lock(&recall_lock);
242 list_del_init(&dp->dl_recall_lru);
243 spin_unlock(&recall_lock);
244 nfs4_close_delegation(dp);
245 nfs4_put_delegation(dp);
246}
247
248/*
249 * SETCLIENTID state
250 */
251
252/* Hash tables for nfs4_clientid state */
253#define CLIENT_HASH_BITS 4
254#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
255#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
256
257#define clientid_hashval(id) \
258 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 259#define clientstr_hashval(name) \
260 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 261/*
262 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
263 * used in reboot/reset lease grace period processing
264 *
265 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
266 * setclientid_confirmed info.
267 *
268 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
269 * setclientid info.
270 *
271 * client_lru holds client queue ordered by nfs4_client.cl_time
272 * for lease renewal.
273 *
274 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
275 * for last close replay.
276 */
277static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
278static int reclaim_str_hashtbl_size = 0;
279static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
280static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
281static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
282static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
283static struct list_head client_lru;
284static struct list_head close_lru;
285
2283963f
BF		 286static void unhash_generic_stateid(struct nfs4_stateid *stp)
287{
288 list_del(&stp->st_hash);
289 list_del(&stp->st_perfile);
290 list_del(&stp->st_perstateowner);
291}
292
293static void free_generic_stateid(struct nfs4_stateid *stp)
294{
295 put_nfs4_file(stp->st_file);
296 kmem_cache_free(stateid_slab, stp);
297}
298
299static void release_lock_stateid(struct nfs4_stateid *stp)
300{
301 unhash_generic_stateid(stp);
302 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
303 free_generic_stateid(stp);
304}
305
f044ff83
BF		 306static void unhash_lockowner(struct nfs4_stateowner *sop)
307{
308 struct nfs4_stateid *stp;
309
310 list_del(&sop->so_idhash);
311 list_del(&sop->so_strhash);
312 list_del(&sop->so_perstateid);
313 while (!list_empty(&sop->so_stateids)) {
314 stp = list_first_entry(&sop->so_stateids,
315 struct nfs4_stateid, st_perstateowner);
316 release_lock_stateid(stp);
317 }
318}
319
320static void release_lockowner(struct nfs4_stateowner *sop)
321{
322 unhash_lockowner(sop);
323 nfs4_put_stateowner(sop);
324}
325
f1d110ca
BF		 326static void
327release_stateid_lockowners(struct nfs4_stateid *open_stp)
328{
329 struct nfs4_stateowner *lock_sop;
330
331 while (!list_empty(&open_stp->st_lockowners)) {
332 lock_sop = list_entry(open_stp->st_lockowners.next,
333 struct nfs4_stateowner, so_perstateid);
334 /* list_del(&open_stp->st_lockowners); */
335 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 336 release_lockowner(lock_sop);
f1d110ca
BF		 337 }
338}
339
2283963f
BF		 340static void release_open_stateid(struct nfs4_stateid *stp)
341{
342 unhash_generic_stateid(stp);
343 release_stateid_lockowners(stp);
344 nfsd_close(stp->st_vfs_file);
345 free_generic_stateid(stp);
346}
347
f044ff83 348static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 349{
350 struct nfs4_stateid *stp;
351
352 list_del(&sop->so_idhash);
353 list_del(&sop->so_strhash);
f044ff83
BF		 354 list_del(&sop->so_perclient);
355 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 356 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 357 stp = list_first_entry(&sop->so_stateids,
358 struct nfs4_stateid, st_perstateowner);
359 release_open_stateid(stp);
f1d110ca
BF		 360 }
361}
362
f044ff83 363static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 364{
f044ff83 365 unhash_openowner(sop);
f1d110ca
BF		 366 list_del(&sop->so_close_lru);
367 nfs4_put_stateowner(sop);
368}
369
5282fd72
ME		 370static DEFINE_SPINLOCK(sessionid_lock);
371#define SESSION_HASH_SIZE 512
372static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
373
374static inline int
375hash_sessionid(struct nfs4_sessionid *sessionid)
376{
377 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
378
379 return sid->sequence % SESSION_HASH_SIZE;
380}
381
382static inline void
383dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
384{
385 u32 *ptr = (u32 *)(&sessionid->data[0]);
386 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
387}
388
ec6b5d7b
AA		 389static void
390gen_sessionid(struct nfsd4_session *ses)
391{
392 struct nfs4_client *clp = ses->se_client;
393 struct nfsd4_sessionid *sid;
394
395 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
396 sid->clientid = clp->cl_clientid;
397 sid->sequence = current_sessionid++;
398 sid->reserved = 0;
399}
400
401/*
a649637c
AA		 402 * The protocol defines ca_maxresponssize_cached to include the size of
403 * the rpc header, but all we need to cache is the data starting after
404 * the end of the initial SEQUENCE operation--the rest we regenerate
405 * each time. Therefore we can advertise a ca_maxresponssize_cached
406 * value that is the number of bytes in our cache plus a few additional
407 * bytes. In order to stay on the safe side, and not promise more than
408 * we can cache, those additional bytes must be the minimum possible: 24
409 * bytes of rpc header (xid through accept state, with AUTH_NULL
410 * verifier), 12 for the compound header (with zero-length tag), and 44
411 * for the SEQUENCE op response:
412 */
413#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
414
415/*
416 * Give the client the number of ca_maxresponsesize_cached slots it
417 * requests, of size bounded by NFSD_SLOT_CACHE_SIZE,
418 * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more
419 * than NFSD_MAX_SLOTS_PER_SESSION.
ec6b5d7b 420 *
a649637c
AA		 421 * If we run out of reserved DRC memory we should (up to a point)
422 * re-negotiate active sessions and reduce their slot usage to make
423 * rooom for new connections. For now we just fail the create session.
ec6b5d7b 424 */
a649637c 425static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan)
ec6b5d7b 426{
a649637c 427 int mem, size = fchan->maxresp_cached;
ec6b5d7b 428
5d77ddfb
AA		 429 if (fchan->maxreqs < 1)
430 return nfserr_inval;
5d77ddfb 431
a649637c
AA		 432 if (size < NFSD_MIN_HDR_SEQ_SZ)
433 size = NFSD_MIN_HDR_SEQ_SZ;
434 size -= NFSD_MIN_HDR_SEQ_SZ;
435 if (size > NFSD_SLOT_CACHE_SIZE)
436 size = NFSD_SLOT_CACHE_SIZE;
ec6b5d7b 437
a649637c
AA		 438 /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */
439 mem = fchan->maxreqs * size;
440 if (mem > NFSD_MAX_MEM_PER_SESSION) {
441 fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size;
442 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
443 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
444 mem = fchan->maxreqs * size;
445 }
ec6b5d7b 446
4bd9b0f4 447 spin_lock(&nfsd_drc_lock);
a649637c
AA		 448 /* bound the total session drc memory ussage */
449 if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) {
450 fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size;
451 mem = fchan->maxreqs * size;
452 }
0c193054 453 nfsd_drc_mem_used += mem;
4bd9b0f4 454 spin_unlock(&nfsd_drc_lock);
ec6b5d7b 455
b101ebbc 456 if (fchan->maxreqs == 0)
bdac86e2 457 return nfserr_serverfault;
a649637c
AA		 458
459 fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ;
b101ebbc 460 return 0;
ec6b5d7b
AA		 461}
462
463/*
464 * fchan holds the client values on input, and the server values on output
ddc04fd4 465 * sv_max_mesg is the maximum payload plus one page for overhead.
ec6b5d7b
AA		 466 */
467static int init_forechannel_attrs(struct svc_rqst *rqstp,
6c18ba9f
AB		 468 struct nfsd4_channel_attrs *session_fchan,
469 struct nfsd4_channel_attrs *fchan)
ec6b5d7b
AA		 470{
471 int status = 0;
ddc04fd4 472 __u32 maxcount = nfsd_serv->sv_max_mesg;
ec6b5d7b
AA		 473
474 /* headerpadsz set to zero in encode routine */
475
476 /* Use the client's max request and max response size if possible */
477 if (fchan->maxreq_sz > maxcount)
478 fchan->maxreq_sz = maxcount;
6c18ba9f 479 session_fchan->maxreq_sz = fchan->maxreq_sz;
ec6b5d7b
AA		 480
481 if (fchan->maxresp_sz > maxcount)
482 fchan->maxresp_sz = maxcount;
6c18ba9f 483 session_fchan->maxresp_sz = fchan->maxresp_sz;
ec6b5d7b 484
ec6b5d7b
AA		 485 /* Use the client's maxops if possible */
486 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
487 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
6c18ba9f 488 session_fchan->maxops = fchan->maxops;
ec6b5d7b 489
ec6b5d7b
AA		 490 /* FIXME: Error means no more DRC pages so the server should
491 * recover pages from existing sessions. For now fail session
492 * creation.
493 */
a649637c 494 status = set_forechannel_drc_size(fchan);
ec6b5d7b 495
a649637c 496 session_fchan->maxresp_cached = fchan->maxresp_cached;
6c18ba9f 497 session_fchan->maxreqs = fchan->maxreqs;
a649637c
AA		 498
499 dprintk("%s status %d\n", __func__, status);
ec6b5d7b
AA		 500 return status;
501}
502
557ce264
AA		 503static void
504free_session_slots(struct nfsd4_session *ses)
505{
506 int i;
507
508 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
509 kfree(ses->se_slots[i]);
510}
511
efe0cb6d
BF		 512/*
513 * We don't actually need to cache the rpc and session headers, so we
514 * can allocate a little less for each slot:
515 */
516static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
517{
518 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
519}
520
ec6b5d7b
AA		 521static int
522alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
523 struct nfsd4_create_session *cses)
524{
525 struct nfsd4_session *new, tmp;
557ce264
AA		 526 struct nfsd4_slot *sp;
527 int idx, slotsize, cachesize, i;
528 int status;
ec6b5d7b
AA		 529
530 memset(&tmp, 0, sizeof(tmp));
531
532 /* FIXME: For now, we just accept the client back channel attributes. */
6c18ba9f
AB		 533 tmp.se_bchannel = cses->back_channel;
534 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel,
535 &cses->fore_channel);
ec6b5d7b
AA		 536 if (status)
537 goto out;
538
557ce264
AA		 539 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot)
540 + sizeof(struct nfsd4_session) > PAGE_SIZE);
541
542 status = nfserr_serverfault;
543 /* allocate struct nfsd4_session and slot table pointers in one piece */
544 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *);
ec6b5d7b
AA		 545 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
546 if (!new)
547 goto out;
548
549 memcpy(new, &tmp, sizeof(*new));
550
557ce264 551 /* allocate each struct nfsd4_slot and data cache in one piece */
efe0cb6d 552 cachesize = slot_bytes(&new->se_fchannel);
557ce264
AA		 553 for (i = 0; i < new->se_fchannel.maxreqs; i++) {
554 sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL);
555 if (!sp)
556 goto out_free;
557 new->se_slots[i] = sp;
558 }
559
ec6b5d7b
AA		 560 new->se_client = clp;
561 gen_sessionid(new);
562 idx = hash_sessionid(&new->se_sessionid);
563 memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
564 NFS4_MAX_SESSIONID_LEN);
565
566 new->se_flags = cses->flags;
567 kref_init(&new->se_ref);
568 spin_lock(&sessionid_lock);
569 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
570 list_add(&new->se_perclnt, &clp->cl_sessions);
571 spin_unlock(&sessionid_lock);
572
573 status = nfs_ok;
574out:
575 return status;
557ce264
AA		 576out_free:
577 free_session_slots(new);
578 kfree(new);
579 goto out;
ec6b5d7b
AA		 580}
581
5282fd72
ME		 582/* caller must hold sessionid_lock */
583static struct nfsd4_session *
584find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
585{
586 struct nfsd4_session *elem;
587 int idx;
588
589 dump_sessionid(__func__, sessionid);
590 idx = hash_sessionid(sessionid);
591 dprintk("%s: idx is %d\n", __func__, idx);
592 /* Search in the appropriate list */
593 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
594 dump_sessionid("list traversal", &elem->se_sessionid);
595 if (!memcmp(elem->se_sessionid.data, sessionid->data,
596 NFS4_MAX_SESSIONID_LEN)) {
597 return elem;
598 }
599 }
600
601 dprintk("%s: session not found\n", __func__);
602 return NULL;
603}
604
605/* caller must hold sessionid_lock */
7116ed6b 606static void
5282fd72 607unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 608{
609 list_del(&ses->se_hash);
610 list_del(&ses->se_perclnt);
5282fd72
ME		 611}
612
613static void
614release_session(struct nfsd4_session *ses)
615{
616 spin_lock(&sessionid_lock);
617 unhash_session(ses);
618 spin_unlock(&sessionid_lock);
7116ed6b
AA		 619 nfsd4_put_session(ses);
620}
621
622void
623free_session(struct kref *kref)
624{
625 struct nfsd4_session *ses;
dd829c45 626 int mem;
7116ed6b
AA		 627
628 ses = container_of(kref, struct nfsd4_session, se_ref);
be98d1bb 629 spin_lock(&nfsd_drc_lock);
efe0cb6d 630 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
dd829c45 631 nfsd_drc_mem_used -= mem;
be98d1bb 632 spin_unlock(&nfsd_drc_lock);
557ce264 633 free_session_slots(ses);
7116ed6b
AA		 634 kfree(ses);
635}
636
1da177e4
LT		 637static inline void
638renew_client(struct nfs4_client *clp)
639{
640 /*
641 * Move client to the end to the LRU list.
642 */
643 dprintk("renewing client (clientid %08x/%08x)\n",
644 clp->cl_clientid.cl_boot,
645 clp->cl_clientid.cl_id);
646 list_move_tail(&clp->cl_lru, &client_lru);
647 clp->cl_time = get_seconds();
648}
649
650/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
651static int
652STALE_CLIENTID(clientid_t *clid)
653{
654 if (clid->cl_boot == boot_time)
655 return 0;
60adfc50
AA		 656 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
657 clid->cl_boot, clid->cl_id, boot_time);
1da177e4
LT		 658 return 1;
659}
660
661/*
662 * XXX Should we use a slab cache ?
663 * This type of memory management is somewhat inefficient, but we use it
664 * anyway since SETCLIENTID is not a common operation.
665 */
35bba9a3 666static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 667{
668 struct nfs4_client *clp;
669
35bba9a3
BF		 670 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
671 if (clp == NULL)
672 return NULL;
673 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
674 if (clp->cl_name.data == NULL) {
675 kfree(clp);
676 return NULL;
1da177e4 677 }
35bba9a3
BF		 678 memcpy(clp->cl_name.data, name.data, name.len);
679 clp->cl_name.len = name.len;
1da177e4
LT		 680 return clp;
681}
682
683static inline void
684free_client(struct nfs4_client *clp)
685{
686 if (clp->cl_cred.cr_group_info)
687 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 688 kfree(clp->cl_principal);
1da177e4
LT		 689 kfree(clp->cl_name.data);
690 kfree(clp);
691}
692
693void
694put_nfs4_client(struct nfs4_client *clp)
695{
696 if (atomic_dec_and_test(&clp->cl_count))
697 free_client(clp);
698}
699
700static void
701expire_client(struct nfs4_client *clp)
702{
703 struct nfs4_stateowner *sop;
704 struct nfs4_delegation *dp;
1da177e4
LT		 705 struct list_head reaplist;
706
1da177e4
LT		 707 INIT_LIST_HEAD(&reaplist);
708 spin_lock(&recall_lock);
ea1da636
N		 709 while (!list_empty(&clp->cl_delegations)) {
710 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 711 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
712 dp->dl_flock);
ea1da636 713 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 714 list_move(&dp->dl_recall_lru, &reaplist);
715 }
716 spin_unlock(&recall_lock);
717 while (!list_empty(&reaplist)) {
718 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
719 list_del_init(&dp->dl_recall_lru);
720 unhash_delegation(dp);
721 }
722 list_del(&clp->cl_idhash);
723 list_del(&clp->cl_strhash);
724 list_del(&clp->cl_lru);
ea1da636
N		 725 while (!list_empty(&clp->cl_openowners)) {
726 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 727 release_openowner(sop);
1da177e4 728 }
c4bf7868
ME		 729 while (!list_empty(&clp->cl_sessions)) {
730 struct nfsd4_session *ses;
731 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
732 se_perclnt);
733 release_session(ses);
734 }
b5a1a81e 735 nfsd4_set_callback_client(clp, NULL);
147efd0d
BF		 736 if (clp->cl_cb_xprt)
737 svc_xprt_put(clp->cl_cb_xprt);
1da177e4
LT		 738 put_nfs4_client(clp);
739}
740
35bba9a3
BF		 741static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
742{
743 memcpy(target->cl_verifier.data, source->data,
744 sizeof(target->cl_verifier.data));
1da177e4
LT		 745}
746
35bba9a3
BF		 747static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
748{
1da177e4
LT		 749 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
750 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
751}
752
35bba9a3
BF		 753static void copy_cred(struct svc_cred *target, struct svc_cred *source)
754{
1da177e4
LT		 755 target->cr_uid = source->cr_uid;
756 target->cr_gid = source->cr_gid;
757 target->cr_group_info = source->cr_group_info;
758 get_group_info(target->cr_group_info);
759}
760
35bba9a3 761static int same_name(const char *n1, const char *n2)
599e0a22 762{
a55370a3 763 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 764}
765
766static int
599e0a22
BF		 767same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
768{
769 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 770}
771
772static int
599e0a22
BF		 773same_clid(clientid_t *cl1, clientid_t *cl2)
774{
775 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 776}
777
778/* XXX what about NGROUP */
779static int
599e0a22
BF		 780same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
781{
782 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 783}
784
5ec7b46c
BF		 785static void gen_clid(struct nfs4_client *clp)
786{
787 static u32 current_clientid = 1;
788
1da177e4
LT		 789 clp->cl_clientid.cl_boot = boot_time;
790 clp->cl_clientid.cl_id = current_clientid++;
791}
792
deda2faa
BF		 793static void gen_confirm(struct nfs4_client *clp)
794{
795 static u32 i;
796 u32 *p;
1da177e4 797
1da177e4 798 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 799 *p++ = get_seconds();
800 *p++ = i++;
1da177e4
LT		 801}
802
b09333c4
RL		 803static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
804 struct svc_rqst *rqstp, nfs4_verifier *verf)
805{
806 struct nfs4_client *clp;
807 struct sockaddr *sa = svc_addr(rqstp);
808 char *princ;
809
810 clp = alloc_client(name);
811 if (clp == NULL)
812 return NULL;
813
814 princ = svc_gss_principal(rqstp);
815 if (princ) {
816 clp->cl_principal = kstrdup(princ, GFP_KERNEL);
817 if (clp->cl_principal == NULL) {
818 free_client(clp);
819 return NULL;
820 }
821 }
822
823 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
824 atomic_set(&clp->cl_count, 1);
825 atomic_set(&clp->cl_cb_conn.cb_set, 0);
826 INIT_LIST_HEAD(&clp->cl_idhash);
827 INIT_LIST_HEAD(&clp->cl_strhash);
828 INIT_LIST_HEAD(&clp->cl_openowners);
829 INIT_LIST_HEAD(&clp->cl_delegations);
830 INIT_LIST_HEAD(&clp->cl_sessions);
831 INIT_LIST_HEAD(&clp->cl_lru);
832 clear_bit(0, &clp->cl_cb_slot_busy);
833 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
834 copy_verf(clp, verf);
835 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
836 clp->cl_flavor = rqstp->rq_flavor;
837 copy_cred(&clp->cl_cred, &rqstp->rq_cred);
838 gen_confirm(clp);
839
840 return clp;
841}
842
35bba9a3
BF		 843static int check_name(struct xdr_netobj name)
844{
1da177e4
LT		 845 if (name.len == 0)
846 return 0;
847 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 848 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 849 return 0;
850 }
851 return 1;
852}
853
fd39ca9a 854static void
1da177e4
LT		 855add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
856{
857 unsigned int idhashval;
858
859 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
860 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
861 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
862 list_add_tail(&clp->cl_lru, &client_lru);
863 clp->cl_time = get_seconds();
864}
865
fd39ca9a 866static void
1da177e4
LT		 867move_to_confirmed(struct nfs4_client *clp)
868{
869 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
870 unsigned int strhashval;
871
872 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
873 list_del_init(&clp->cl_strhash);
f116629d 874 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 875 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 876 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
877 renew_client(clp);
878}
879
880static struct nfs4_client *
881find_confirmed_client(clientid_t *clid)
882{
883 struct nfs4_client *clp;
884 unsigned int idhashval = clientid_hashval(clid->cl_id);
885
886 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 887 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 888 return clp;
889 }
890 return NULL;
891}
892
893static struct nfs4_client *
894find_unconfirmed_client(clientid_t *clid)
895{
896 struct nfs4_client *clp;
897 unsigned int idhashval = clientid_hashval(clid->cl_id);
898
899 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 900 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 901 return clp;
902 }
903 return NULL;
904}
905
a1bcecd2
AA		 906/*
907 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
908 * parameter. Matching is based on the fact the at least one of the
909 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
910 *
911 * FIXME: we need to unify the clientid namespaces for nfsv4.x
912 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
913 * and SET_CLIENTID{,_CONFIRM}
914 */
915static inline int
916match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
917{
918 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
919 return use_exchange_id == has_exchange_flags;
920}
921
28ce6054 922static struct nfs4_client *
a1bcecd2
AA		 923find_confirmed_client_by_str(const char *dname, unsigned int hashval,
924 bool use_exchange_id)
28ce6054
N		 925{
926 struct nfs4_client *clp;
927
928 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 929 if (same_name(clp->cl_recdir, dname) &&
930 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 931 return clp;
932 }
933 return NULL;
934}
935
936static struct nfs4_client *
a1bcecd2
AA		 937find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
938 bool use_exchange_id)
28ce6054
N		 939{
940 struct nfs4_client *clp;
941
942 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 943 if (same_name(clp->cl_recdir, dname) &&
944 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 945 return clp;
946 }
947 return NULL;
948}
949
fd39ca9a 950static void
fbf4665f 951gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid)
1da177e4 952{
c237dc03 953 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
7077ecba
JL		 954 unsigned short expected_family;
955
956 /* Currently, we only support tcp and tcp6 for the callback channel */
957 if (se->se_callback_netid_len == 3 &&
958 !memcmp(se->se_callback_netid_val, "tcp", 3))
959 expected_family = AF_INET;
960 else if (se->se_callback_netid_len == 4 &&
961 !memcmp(se->se_callback_netid_val, "tcp6", 4))
962 expected_family = AF_INET6;
963 else
1da177e4
LT		 964 goto out_err;
965
aa9a4ec7
JL		 966 cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
967 se->se_callback_addr_len,
968 (struct sockaddr *) &cb->cb_addr,
969 sizeof(cb->cb_addr));
970
7077ecba 971 if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family)
1da177e4 972 goto out_err;
aa9a4ec7 973
fbf4665f
JL		 974 if (cb->cb_addr.ss_family == AF_INET6)
975 ((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid;
976
ab52ae6d 977 cb->cb_minorversion = 0;
1da177e4
LT		 978 cb->cb_prog = se->se_callback_prog;
979 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 980 return;
981out_err:
aa9a4ec7
JL		 982 cb->cb_addr.ss_family = AF_UNSPEC;
983 cb->cb_addrlen = 0;
849823c5 984 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 985 "will not receive delegations\n",
986 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
987
1da177e4
LT		 988 return;
989}
990
074fe897 991/*
557ce264 992 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
074fe897 993 */
074fe897
AA		 994void
995nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
074fe897 996{
557ce264
AA		 997 struct nfsd4_slot *slot = resp->cstate.slot;
998 unsigned int base;
074fe897 999
557ce264 1000 dprintk("--> %s slot %p\n", __func__, slot);
074fe897 1001
557ce264
AA		 1002 slot->sl_opcnt = resp->opcnt;
1003 slot->sl_status = resp->cstate.status;
074fe897 1004
bf864a31 1005 if (nfsd4_not_cached(resp)) {
557ce264 1006 slot->sl_datalen = 0;
bf864a31 1007 return;
074fe897 1008 }
557ce264
AA		 1009 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1010 base = (char *)resp->cstate.datap -
1011 (char *)resp->xbuf->head[0].iov_base;
1012 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1013 slot->sl_datalen))
1014 WARN("%s: sessions DRC could not cache compound\n", __func__);
1015 return;
074fe897
AA		 1016}
1017
1018/*
abfabf8c
AA		 1019 * Encode the replay sequence operation from the slot values.
1020 * If cachethis is FALSE encode the uncached rep error on the next
1021 * operation which sets resp->p and increments resp->opcnt for
1022 * nfs4svc_encode_compoundres.
074fe897 1023 *
074fe897 1024 */
abfabf8c
AA		 1025static __be32
1026nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1027 struct nfsd4_compoundres *resp)
074fe897 1028{
abfabf8c
AA		 1029 struct nfsd4_op *op;
1030 struct nfsd4_slot *slot = resp->cstate.slot;
bf864a31 1031
abfabf8c 1032 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
557ce264 1033 resp->opcnt, resp->cstate.slot->sl_cachethis);
bf864a31 1034
abfabf8c
AA		 1035 /* Encode the replayed sequence operation */
1036 op = &args->ops[resp->opcnt - 1];
1037 nfsd4_encode_operation(resp, op);
bf864a31 1038
abfabf8c 1039 /* Return nfserr_retry_uncached_rep in next operation. */
557ce264 1040 if (args->opcnt > 1 && slot->sl_cachethis == 0) {
abfabf8c
AA		 1041 op = &args->ops[resp->opcnt++];
1042 op->status = nfserr_retry_uncached_rep;
1043 nfsd4_encode_operation(resp, op);
074fe897 1044 }
abfabf8c 1045 return op->status;
074fe897
AA		 1046}
1047
1048/*
557ce264
AA		 1049 * The sequence operation is not cached because we can use the slot and
1050 * session values.
074fe897
AA		 1051 */
1052__be32
bf864a31
AA		 1053nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1054 struct nfsd4_sequence *seq)
074fe897 1055{
557ce264 1056 struct nfsd4_slot *slot = resp->cstate.slot;
074fe897
AA		 1057 __be32 status;
1058
557ce264 1059 dprintk("--> %s slot %p\n", __func__, slot);
074fe897 1060
abfabf8c
AA		 1061 /* Either returns 0 or nfserr_retry_uncached */
1062 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1063 if (status == nfserr_retry_uncached_rep)
1064 return status;
074fe897 1065
557ce264
AA		 1066 /* The sequence operation has been encoded, cstate->datap set. */
1067 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
074fe897 1068
557ce264
AA		 1069 resp->opcnt = slot->sl_opcnt;
1070 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1071 status = slot->sl_status;
074fe897
AA		 1072
1073 return status;
1074}
1075
0733d213
AA		 1076/*
1077 * Set the exchange_id flags returned by the server.
1078 */
1079static void
1080nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1081{
1082 /* pNFS is not supported */
1083 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1084
1085 /* Referrals are supported, Migration is not. */
1086 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1087
1088 /* set the wire flags to return to client. */
1089 clid->flags = new->cl_exchange_flags;
1090}
1091
069b6ad4
AA		 1092__be32
1093nfsd4_exchange_id(struct svc_rqst *rqstp,
1094 struct nfsd4_compound_state *cstate,
1095 struct nfsd4_exchange_id *exid)
1096{
0733d213
AA		 1097 struct nfs4_client *unconf, *conf, *new;
1098 int status;
1099 unsigned int strhashval;
1100 char dname[HEXDIR_LEN];
363168b4 1101 char addr_str[INET6_ADDRSTRLEN];
0733d213 1102 nfs4_verifier verf = exid->verifier;
363168b4 1103 struct sockaddr *sa = svc_addr(rqstp);
0733d213 1104
363168b4 1105 rpc_ntop(sa, addr_str, sizeof(addr_str));
0733d213 1106 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
363168b4 1107 "ip_addr=%s flags %x, spa_how %d\n",
0733d213 1108 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
363168b4 1109 addr_str, exid->flags, exid->spa_how);
0733d213
AA		 1110
1111 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1112 return nfserr_inval;
1113
1114 /* Currently only support SP4_NONE */
1115 switch (exid->spa_how) {
1116 case SP4_NONE:
1117 break;
1118 case SP4_SSV:
1119 return nfserr_encr_alg_unsupp;
1120 default:
1121 BUG(); /* checked by xdr code */
1122 case SP4_MACH_CRED:
1123 return nfserr_serverfault; /* no excuse :-/ */
1124 }
1125
1126 status = nfs4_make_rec_clidname(dname, &exid->clname);
1127
1128 if (status)
1129 goto error;
1130
1131 strhashval = clientstr_hashval(dname);
1132
1133 nfs4_lock_state();
1134 status = nfs_ok;
1135
a1bcecd2 1136 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1137 if (conf) {
1138 if (!same_verf(&verf, &conf->cl_verifier)) {
1139 /* 18.35.4 case 8 */
1140 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1141 status = nfserr_not_same;
1142 goto out;
1143 }
1144 /* Client reboot: destroy old state */
1145 expire_client(conf);
1146 goto out_new;
1147 }
1148 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1149 /* 18.35.4 case 9 */
1150 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1151 status = nfserr_perm;
1152 goto out;
1153 }
1154 expire_client(conf);
1155 goto out_new;
1156 }
0733d213
AA		 1157 /*
1158 * Set bit when the owner id and verifier map to an already
1159 * confirmed client id (18.35.3).
1160 */
1161 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1162
1163 /*
1164 * Falling into 18.35.4 case 2, possible router replay.
1165 * Leave confirmed record intact and return same result.
1166 */
1167 copy_verf(conf, &verf);
1168 new = conf;
1169 goto out_copy;
6ddbbbfe
MS		 1170 }
1171
1172 /* 18.35.4 case 7 */
1173 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1174 status = nfserr_noent;
1175 goto out;
0733d213
AA		 1176 }
1177
a1bcecd2 1178 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1179 if (unconf) {
1180 /*
1181 * Possible retry or client restart. Per 18.35.4 case 4,
1182 * a new unconfirmed record should be generated regardless
1183 * of whether any properties have changed.
1184 */
1185 expire_client(unconf);
1186 }
1187
1188out_new:
1189 /* Normal case */
b09333c4 1190 new = create_client(exid->clname, dname, rqstp, &verf);
0733d213 1191 if (new == NULL) {
bdac86e2 1192 status = nfserr_serverfault;
0733d213
AA		 1193 goto out;
1194 }
1195
0733d213 1196 gen_clid(new);
0733d213
AA		 1197 add_to_unconfirmed(new, strhashval);
1198out_copy:
1199 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1200 exid->clientid.cl_id = new->cl_clientid.cl_id;
1201
38eb76a5 1202 exid->seqid = 1;
0733d213
AA		 1203 nfsd4_set_ex_flags(new, exid);
1204
1205 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
49557cc7 1206 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
0733d213
AA		 1207 status = nfs_ok;
1208
1209out:
1210 nfs4_unlock_state();
1211error:
1212 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1213 return status;
069b6ad4
AA		 1214}
1215
b85d4c01 1216static int
88e588d5 1217check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
b85d4c01 1218{
88e588d5
AA		 1219 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1220 slot_seqid);
b85d4c01
BH		 1221
1222 /* The slot is in use, and no response has been sent. */
88e588d5
AA		 1223 if (slot_inuse) {
1224 if (seqid == slot_seqid)
b85d4c01
BH		 1225 return nfserr_jukebox;
1226 else
1227 return nfserr_seq_misordered;
1228 }
1229 /* Normal */
88e588d5 1230 if (likely(seqid == slot_seqid + 1))
b85d4c01
BH		 1231 return nfs_ok;
1232 /* Replay */
88e588d5 1233 if (seqid == slot_seqid)
b85d4c01
BH		 1234 return nfserr_replay_cache;
1235 /* Wraparound */
88e588d5 1236 if (seqid == 1 && (slot_seqid + 1) == 0)
b85d4c01
BH		 1237 return nfs_ok;
1238 /* Misordered replay or misordered new request */
1239 return nfserr_seq_misordered;
1240}
1241
49557cc7
AA		 1242/*
1243 * Cache the create session result into the create session single DRC
1244 * slot cache by saving the xdr structure. sl_seqid has been set.
1245 * Do this for solo or embedded create session operations.
1246 */
1247static void
1248nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1249 struct nfsd4_clid_slot *slot, int nfserr)
1250{
1251 slot->sl_status = nfserr;
1252 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1253}
1254
1255static __be32
1256nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1257 struct nfsd4_clid_slot *slot)
1258{
1259 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1260 return slot->sl_status;
1261}
1262
069b6ad4
AA		 1263__be32
1264nfsd4_create_session(struct svc_rqst *rqstp,
1265 struct nfsd4_compound_state *cstate,
1266 struct nfsd4_create_session *cr_ses)
1267{
363168b4 1268 struct sockaddr *sa = svc_addr(rqstp);
ec6b5d7b 1269 struct nfs4_client *conf, *unconf;
49557cc7 1270 struct nfsd4_clid_slot *cs_slot = NULL;
ec6b5d7b
AA		 1271 int status = 0;
1272
1273 nfs4_lock_state();
1274 unconf = find_unconfirmed_client(&cr_ses->clientid);
1275 conf = find_confirmed_client(&cr_ses->clientid);
1276
1277 if (conf) {
49557cc7
AA		 1278 cs_slot = &conf->cl_cs_slot;
1279 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
38eb76a5 1280 if (status == nfserr_replay_cache) {
ec6b5d7b 1281 dprintk("Got a create_session replay! seqid= %d\n",
49557cc7 1282 cs_slot->sl_seqid);
38eb76a5 1283 /* Return the cached reply status */
49557cc7 1284 status = nfsd4_replay_create_session(cr_ses, cs_slot);
38eb76a5 1285 goto out;
49557cc7 1286 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
ec6b5d7b
AA		 1287 status = nfserr_seq_misordered;
1288 dprintk("Sequence misordered!\n");
1289 dprintk("Expected seqid= %d but got seqid= %d\n",
49557cc7 1290 cs_slot->sl_seqid, cr_ses->seqid);
ec6b5d7b
AA		 1291 goto out;
1292 }
49557cc7 1293 cs_slot->sl_seqid++;
ec6b5d7b
AA		 1294 } else if (unconf) {
1295 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
363168b4 1296 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
ec6b5d7b
AA		 1297 status = nfserr_clid_inuse;
1298 goto out;
1299 }
1300
49557cc7
AA		 1301 cs_slot = &unconf->cl_cs_slot;
1302 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
38eb76a5
AA		 1303 if (status) {
1304 /* an unconfirmed replay returns misordered */
ec6b5d7b 1305 status = nfserr_seq_misordered;
49557cc7 1306 goto out_cache;
ec6b5d7b
AA		 1307 }
1308
49557cc7 1309 cs_slot->sl_seqid++; /* from 0 to 1 */
ec6b5d7b
AA		 1310 move_to_confirmed(unconf);
1311
38524ab3
AA		 1312 if (cr_ses->flags & SESSION4_BACK_CHAN) {
1313 unconf->cl_cb_xprt = rqstp->rq_xprt;
1314 svc_xprt_get(unconf->cl_cb_xprt);
1315 rpc_copy_addr(
1316 (struct sockaddr *)&unconf->cl_cb_conn.cb_addr,
1317 sa);
1318 unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1319 unconf->cl_cb_conn.cb_minorversion =
1320 cstate->minorversion;
1321 unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog;
2a1d1b59 1322 unconf->cl_cb_seq_nr = 1;
38524ab3
AA		 1323 nfsd4_probe_callback(unconf);
1324 }
ec6b5d7b
AA		 1325 conf = unconf;
1326 } else {
1327 status = nfserr_stale_clientid;
1328 goto out;
1329 }
1330
408b79bc
BF		 1331 /*
1332 * We do not support RDMA or persistent sessions
1333 */
1334 cr_ses->flags &= ~SESSION4_PERSIST;
1335 cr_ses->flags &= ~SESSION4_RDMA;
1336
ec6b5d7b
AA		 1337 status = alloc_init_session(rqstp, conf, cr_ses);
1338 if (status)
1339 goto out;
1340
ec6b5d7b
AA		 1341 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
1342 NFS4_MAX_SESSIONID_LEN);
49557cc7 1343 cr_ses->seqid = cs_slot->sl_seqid;
ec6b5d7b 1344
49557cc7
AA		 1345out_cache:
1346 /* cache solo and embedded create sessions under the state lock */
1347 nfsd4_cache_create_session(cr_ses, cs_slot, status);
ec6b5d7b
AA		 1348out:
1349 nfs4_unlock_state();
1350 dprintk("%s returns %d\n", __func__, ntohl(status));
1351 return status;
069b6ad4
AA		 1352}
1353
1354__be32
1355nfsd4_destroy_session(struct svc_rqst *r,
1356 struct nfsd4_compound_state *cstate,
1357 struct nfsd4_destroy_session *sessionid)
1358{
e10e0cfc
BH		 1359 struct nfsd4_session *ses;
1360 u32 status = nfserr_badsession;
1361
1362 /* Notes:
1363 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1364 * - Should we return nfserr_back_chan_busy if waiting for
1365 * callbacks on to-be-destroyed session?
1366 * - Do we need to clear any callback info from previous session?
1367 */
1368
1369 dump_sessionid(__func__, &sessionid->sessionid);
1370 spin_lock(&sessionid_lock);
1371 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1372 if (!ses) {
1373 spin_unlock(&sessionid_lock);
1374 goto out;
1375 }
1376
1377 unhash_session(ses);
1378 spin_unlock(&sessionid_lock);
1379
1380 /* wait for callbacks */
b5a1a81e 1381 nfsd4_set_callback_client(ses->se_client, NULL);
e10e0cfc
BH		 1382 nfsd4_put_session(ses);
1383 status = nfs_ok;
1384out:
1385 dprintk("%s returns %d\n", __func__, ntohl(status));
1386 return status;
069b6ad4
AA		 1387}
1388
1389__be32
b85d4c01 1390nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1391 struct nfsd4_compound_state *cstate,
1392 struct nfsd4_sequence *seq)
1393{
f9bb94c4 1394 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1395 struct nfsd4_session *session;
1396 struct nfsd4_slot *slot;
1397 int status;
1398
f9bb94c4
AA		 1399 if (resp->opcnt != 1)
1400 return nfserr_sequence_pos;
1401
b85d4c01
BH		 1402 spin_lock(&sessionid_lock);
1403 status = nfserr_badsession;
1404 session = find_in_sessionid_hashtbl(&seq->sessionid);
1405 if (!session)
1406 goto out;
1407
1408 status = nfserr_badslot;
6c18ba9f 1409 if (seq->slotid >= session->se_fchannel.maxreqs)
b85d4c01
BH		 1410 goto out;
1411
557ce264 1412 slot = session->se_slots[seq->slotid];
b85d4c01
BH		 1413 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1414
a8dfdaeb
AA		 1415 /* We do not negotiate the number of slots yet, so set the
1416 * maxslots to the session maxreqs which is used to encode
1417 * sr_highest_slotid and the sr_target_slot id to maxslots */
1418 seq->maxslots = session->se_fchannel.maxreqs;
1419
88e588d5 1420 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
b85d4c01
BH		 1421 if (status == nfserr_replay_cache) {
1422 cstate->slot = slot;
1423 cstate->session = session;
da3846a2 1424 /* Return the cached reply status and set cstate->status
557ce264 1425 * for nfsd4_proc_compound processing */
bf864a31 1426 status = nfsd4_replay_cache_entry(resp, seq);
da3846a2 1427 cstate->status = nfserr_replay_cache;
aaf84eb9 1428 goto out;
b85d4c01
BH		 1429 }
1430 if (status)
1431 goto out;
1432
1433 /* Success! bump slot seqid */
1434 slot->sl_inuse = true;
1435 slot->sl_seqid = seq->seqid;
557ce264 1436 slot->sl_cachethis = seq->cachethis;
b85d4c01
BH		 1437
1438 cstate->slot = slot;
1439 cstate->session = session;
1440
aaf84eb9 1441 /* Hold a session reference until done processing the compound:
b85d4c01
BH		 1442 * nfsd4_put_session called only if the cstate slot is set.
1443 */
b85d4c01
BH		 1444 nfsd4_get_session(session);
1445out:
1446 spin_unlock(&sessionid_lock);
aaf84eb9
BH		 1447 /* Renew the clientid on success and on replay */
1448 if (cstate->session) {
1449 nfs4_lock_state();
1450 renew_client(session->se_client);
1451 nfs4_unlock_state();
1452 }
b85d4c01
BH		 1453 dprintk("%s: return %d\n", __func__, ntohl(status));
1454 return status;
069b6ad4
AA		 1455}
1456
b37ad28b 1457__be32
b591480b
BF		 1458nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1459 struct nfsd4_setclientid *setclid)
1da177e4 1460{
363168b4 1461 struct sockaddr *sa = svc_addr(rqstp);
1da177e4
LT		 1462 struct xdr_netobj clname = {
1463 .len = setclid->se_namelen,
1464 .data = setclid->se_name,
1465 };
1466 nfs4_verifier clverifier = setclid->se_verf;
1467 unsigned int strhashval;
28ce6054 1468 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1469 __be32 status;
a55370a3 1470 char dname[HEXDIR_LEN];
1da177e4 1471
1da177e4 1472 if (!check_name(clname))
73aea4ec 1473 return nfserr_inval;
1da177e4 1474
a55370a3
N		 1475 status = nfs4_make_rec_clidname(dname, &clname);
1476 if (status)
73aea4ec 1477 return status;
a55370a3 1478
1da177e4
LT		 1479 /*
1480 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1481 * We get here on a DRC miss.
1482 */
1483
a55370a3 1484 strhashval = clientstr_hashval(dname);
1da177e4 1485
1da177e4 1486 nfs4_lock_state();
a1bcecd2 1487 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1488 if (conf) {
a186e767 1489 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1490 status = nfserr_clid_inuse;
026722c2 1491 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
363168b4
JL		 1492 char addr_str[INET6_ADDRSTRLEN];
1493 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
1494 sizeof(addr_str));
1495 dprintk("NFSD: setclientid: string in use by client "
1496 "at %s\n", addr_str);
1da177e4
LT		 1497 goto out;
1498 }
1da177e4 1499 }
a186e767
BF		 1500 /*
1501 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1502 * has a description of SETCLIENTID request processing consisting
1503 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1504 */
a1bcecd2 1505 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1506 status = nfserr_resource;
1507 if (!conf) {
a186e767
BF		 1508 /*
1509 * RFC 3530 14.2.33 CASE 4:
1510 * placed first, because it is the normal case
1da177e4
LT		 1511 */
1512 if (unconf)
1513 expire_client(unconf);
b09333c4 1514 new = create_client(clname, dname, rqstp, &clverifier);
a55370a3 1515 if (new == NULL)
1da177e4 1516 goto out;
1da177e4 1517 gen_clid(new);
599e0a22 1518 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1519 /*
a186e767
BF		 1520 * RFC 3530 14.2.33 CASE 1:
1521 * probable callback update
1da177e4 1522 */
31f4a6c1
N		 1523 if (unconf) {
1524 /* Note this is removing unconfirmed {*x***},
1525 * which is stronger than RFC recommended {vxc**}.
1526 * This has the advantage that there is at most
1527 * one {*x***} in either list at any time.
1528 */
1529 expire_client(unconf);
1da177e4 1530 }
b09333c4 1531 new = create_client(clname, dname, rqstp, &clverifier);
a55370a3 1532 if (new == NULL)
1da177e4 1533 goto out;
1da177e4 1534 copy_clid(new, conf);
1da177e4
LT		 1535 } else if (!unconf) {
1536 /*
a186e767
BF		 1537 * RFC 3530 14.2.33 CASE 2:
1538 * probable client reboot; state will be removed if
1539 * confirmed.
1da177e4 1540 */
b09333c4 1541 new = create_client(clname, dname, rqstp, &clverifier);
a55370a3 1542 if (new == NULL)
1da177e4 1543 goto out;
1da177e4 1544 gen_clid(new);
49ba8781 1545 } else {
a186e767
BF		 1546 /*
1547 * RFC 3530 14.2.33 CASE 3:
1548 * probable client reboot; state will be removed if
1549 * confirmed.
1da177e4
LT		 1550 */
1551 expire_client(unconf);
b09333c4 1552 new = create_client(clname, dname, rqstp, &clverifier);
a55370a3 1553 if (new == NULL)
1da177e4 1554 goto out;
1da177e4 1555 gen_clid(new);
1da177e4 1556 }
fbf4665f 1557 gen_callback(new, setclid, rpc_get_scope_id(sa));
c175b83c 1558 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1559 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1560 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1561 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1562 status = nfs_ok;
1563out:
1564 nfs4_unlock_state();
1565 return status;
1566}
1567
1568
1569/*
a186e767
BF		 1570 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1571 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1572 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1573 */
b37ad28b 1574__be32
b591480b
BF		 1575nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1576 struct nfsd4_compound_state *cstate,
1577 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1578{
363168b4 1579 struct sockaddr *sa = svc_addr(rqstp);
21ab45a4 1580 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1581 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1582 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1583 __be32 status;
1da177e4
LT		 1584
1585 if (STALE_CLIENTID(clid))
1586 return nfserr_stale_clientid;
1587 /*
1588 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1589 * We get here on a DRC miss.
1590 */
1591
1592 nfs4_lock_state();
21ab45a4
N		 1593
1594 conf = find_confirmed_client(clid);
1595 unconf = find_unconfirmed_client(clid);
1596
1597 status = nfserr_clid_inuse;
363168b4 1598 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
21ab45a4 1599 goto out;
363168b4 1600 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
21ab45a4
N		 1601 goto out;
1602
a186e767
BF		 1603 /*
1604 * section 14.2.34 of RFC 3530 has a description of
1605 * SETCLIENTID_CONFIRM request processing consisting
1606 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1607 */
366e0c1d 1608 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1609 /*
1610 * RFC 3530 14.2.34 CASE 1:
1611 * callback update
1612 */
599e0a22 1613 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1614 status = nfserr_clid_inuse;
1615 else {
1a69c179
N		 1616 /* XXX: We just turn off callbacks until we can handle
1617 * change request correctly. */
c237dc03 1618 atomic_set(&conf->cl_cb_conn.cb_set, 0);
1a69c179 1619 expire_client(unconf);
1da177e4 1620 status = nfs_ok;
1a69c179 1621
1da177e4 1622 }
f3aba4e5 1623 } else if (conf && !unconf) {
a186e767
BF		 1624 /*
1625 * RFC 3530 14.2.34 CASE 2:
1626 * probable retransmitted request; play it safe and
1627 * do nothing.
7c79f737 1628 */
599e0a22 1629 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1630 status = nfserr_clid_inuse;
21ab45a4 1631 else
1da177e4 1632 status = nfs_ok;
7c79f737 1633 } else if (!conf && unconf
599e0a22 1634 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1635 /*
1636 * RFC 3530 14.2.34 CASE 3:
1637 * Normal case; new or rebooted client:
7c79f737 1638 */
599e0a22 1639 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1640 status = nfserr_clid_inuse;
1641 } else {
1a69c179
N		 1642 unsigned int hash =
1643 clientstr_hashval(unconf->cl_recdir);
1644 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1645 hash, false);
1a69c179 1646 if (conf) {
c7b9a459 1647 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1648 expire_client(conf);
1649 }
1da177e4 1650 move_to_confirmed(unconf);
21ab45a4 1651 conf = unconf;
46f8a64b 1652 nfsd4_probe_callback(conf);
1a69c179 1653 status = nfs_ok;
1da177e4 1654 }
599e0a22
BF		 1655 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1656 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1657 &confirm)))) {
a186e767
BF		 1658 /*
1659 * RFC 3530 14.2.34 CASE 4:
1660 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1661 */
1da177e4 1662 status = nfserr_stale_clientid;
7c79f737 1663 } else {
08e8987c
N		 1664 /* check that we have hit one of the cases...*/
1665 status = nfserr_clid_inuse;
1666 }
1da177e4 1667out:
1da177e4
LT		 1668 nfs4_unlock_state();
1669 return status;
1670}
1671
1da177e4
LT		 1672/* OPEN Share state helper functions */
1673static inline struct nfs4_file *
1674alloc_init_file(struct inode *ino)
1675{
1676 struct nfs4_file *fp;
1677 unsigned int hashval = file_hashval(ino);
1678
e60d4398
N		 1679 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1680 if (fp) {
8b671b80 1681 atomic_set(&fp->fi_ref, 1);
1da177e4 1682 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1683 INIT_LIST_HEAD(&fp->fi_stateids);
1684 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1685 spin_lock(&recall_lock);
1da177e4 1686 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1687 spin_unlock(&recall_lock);
1da177e4
LT		 1688 fp->fi_inode = igrab(ino);
1689 fp->fi_id = current_fileid++;
47f9940c 1690 fp->fi_had_conflict = false;
1da177e4
LT		 1691 return fp;
1692 }
1693 return NULL;
1694}
1695
e60d4398 1696static void
e18b890b 1697nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1698{
e60d4398
N		 1699 if (*slab == NULL)
1700 return;
1a1d92c1 1701 kmem_cache_destroy(*slab);
e60d4398 1702 *slab = NULL;
1da177e4
LT		 1703}
1704
e8ff2a84 1705void
1da177e4
LT		 1706nfsd4_free_slabs(void)
1707{
e60d4398
N		 1708 nfsd4_free_slab(&stateowner_slab);
1709 nfsd4_free_slab(&file_slab);
5ac049ac 1710 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1711 nfsd4_free_slab(&deleg_slab);
e60d4398 1712}
1da177e4 1713
e60d4398
N		 1714static int
1715nfsd4_init_slabs(void)
1716{
1717 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1718 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1719 if (stateowner_slab == NULL)
1720 goto out_nomem;
1721 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1722 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1723 if (file_slab == NULL)
1724 goto out_nomem;
5ac049ac 1725 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1726 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1727 if (stateid_slab == NULL)
1728 goto out_nomem;
5b2d21c1 1729 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1730 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1731 if (deleg_slab == NULL)
1732 goto out_nomem;
e60d4398
N		 1733 return 0;
1734out_nomem:
1735 nfsd4_free_slabs();
1736 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1737 return -ENOMEM;
1da177e4
LT		 1738}
1739
1740void
1741nfs4_free_stateowner(struct kref *kref)
1742{
1743 struct nfs4_stateowner *sop =
1744 container_of(kref, struct nfs4_stateowner, so_ref);
1745 kfree(sop->so_owner.data);
1746 kmem_cache_free(stateowner_slab, sop);
1747}
1748
1749static inline struct nfs4_stateowner *
1750alloc_stateowner(struct xdr_netobj *owner)
1751{
1752 struct nfs4_stateowner *sop;
1753
1754 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1755 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1756 memcpy(sop->so_owner.data, owner->data, owner->len);
1757 sop->so_owner.len = owner->len;
1758 kref_init(&sop->so_ref);
1759 return sop;
1760 }
1761 kmem_cache_free(stateowner_slab, sop);
1762 }
1763 return NULL;
1764}
1765
1766static struct nfs4_stateowner *
1767alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1768 struct nfs4_stateowner *sop;
1769 struct nfs4_replay *rp;
1770 unsigned int idhashval;
1771
1772 if (!(sop = alloc_stateowner(&open->op_owner)))
1773 return NULL;
1774 idhashval = ownerid_hashval(current_ownerid);
1775 INIT_LIST_HEAD(&sop->so_idhash);
1776 INIT_LIST_HEAD(&sop->so_strhash);
1777 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1778 INIT_LIST_HEAD(&sop->so_stateids);
1779 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1780 INIT_LIST_HEAD(&sop->so_close_lru);
1781 sop->so_time = 0;
1782 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1783 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1784 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1785 sop->so_is_open_owner = 1;
1786 sop->so_id = current_ownerid++;
1787 sop->so_client = clp;
1788 sop->so_seqid = open->op_seqid;
1789 sop->so_confirmed = 0;
1790 rp = &sop->so_replay;
de1ae286 1791 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1792 rp->rp_buflen = 0;
1793 rp->rp_buf = rp->rp_ibuf;
1794 return sop;
1795}
1796
1da177e4
LT		 1797static inline void
1798init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1799 struct nfs4_stateowner *sop = open->op_stateowner;
1800 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1801
1802 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1803 INIT_LIST_HEAD(&stp->st_perstateowner);
1804 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1805 INIT_LIST_HEAD(&stp->st_perfile);
1806 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1807 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1808 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1809 stp->st_stateowner = sop;
13cd2184 1810 get_nfs4_file(fp);
1da177e4 1811 stp->st_file = fp;
78155ed7 1812 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 1813 stp->st_stateid.si_stateownerid = sop->so_id;
1814 stp->st_stateid.si_fileid = fp->fi_id;
1815 stp->st_stateid.si_generation = 0;
1816 stp->st_access_bmap = 0;
1817 stp->st_deny_bmap = 0;
84459a11
AA		 1818 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
1819 &stp->st_access_bmap);
1da177e4 1820 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1821 stp->st_openstp = NULL;
1da177e4
LT		 1822}
1823
fd39ca9a 1824static void
1da177e4
LT		 1825move_to_close_lru(struct nfs4_stateowner *sop)
1826{
1827 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1828
358dd55a 1829 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1830 sop->so_time = get_seconds();
1831}
1832
1da177e4 1833static int
599e0a22
BF		 1834same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1835 clientid_t *clid)
1836{
1837 return (sop->so_owner.len == owner->len) &&
1838 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1839 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1840}
1841
1842static struct nfs4_stateowner *
1843find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1844{
1845 struct nfs4_stateowner *so = NULL;
1846
1847 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1848 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1849 return so;
1850 }
1851 return NULL;
1852}
1853
1854/* search file_hashtbl[] for file */
1855static struct nfs4_file *
1856find_file(struct inode *ino)
1857{
1858 unsigned int hashval = file_hashval(ino);
1859 struct nfs4_file *fp;
1860
8b671b80 1861 spin_lock(&recall_lock);
1da177e4 1862 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1863 if (fp->fi_inode == ino) {
1864 get_nfs4_file(fp);
8b671b80 1865 spin_unlock(&recall_lock);
1da177e4 1866 return fp;
13cd2184 1867 }
1da177e4 1868 }
8b671b80 1869 spin_unlock(&recall_lock);
1da177e4
LT		 1870 return NULL;
1871}
1872
d87a8ade 1873static inline int access_valid(u32 x, u32 minorversion)
ba5a6a19 1874{
d87a8ade 1875 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
8838dc43 1876 return 0;
d87a8ade
AA		 1877 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
1878 return 0;
1879 x &= ~NFS4_SHARE_ACCESS_MASK;
1880 if (minorversion && x) {
1881 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
1882 return 0;
1883 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
1884 return 0;
1885 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
1886 }
1887 if (x)
8838dc43
BF		 1888 return 0;
1889 return 1;
ba5a6a19
BF		 1890}
1891
8838dc43 1892static inline int deny_valid(u32 x)
ba5a6a19 1893{
8838dc43
BF		 1894 /* Note: unlike access bits, deny bits may be zero. */
1895 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1896}
1da177e4 1897
4f83aa30
BF		 1898/*
1899 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1900 * st_{access,deny}_bmap field of the stateid, in order to track not
1901 * only what share bits are currently in force, but also what
1902 * combinations of share bits previous opens have used. This allows us
1903 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1904 * return an error if the client attempt to downgrade to a combination
1905 * of share bits not explicable by closing some of its previous opens.
1906 *
1907 * XXX: This enforcement is actually incomplete, since we don't keep
1908 * track of access/deny bit combinations; so, e.g., we allow:
1909 *
1910 * OPEN allow read, deny write
1911 * OPEN allow both, deny none
1912 * DOWNGRADE allow read, deny none
1913 *
1914 * which we should reject.
1915 */
fd39ca9a 1916static void
1da177e4
LT		 1917set_access(unsigned int *access, unsigned long bmap) {
1918 int i;
1919
1920 *access = 0;
1921 for (i = 1; i < 4; i++) {
1922 if (test_bit(i, &bmap))
1923 *access |= i;
1924 }
1925}
1926
fd39ca9a 1927static void
1da177e4
LT		 1928set_deny(unsigned int *deny, unsigned long bmap) {
1929 int i;
1930
1931 *deny = 0;
1932 for (i = 0; i < 4; i++) {
1933 if (test_bit(i, &bmap))
1934 *deny |= i ;
1935 }
1936}
1937
1938static int
1939test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1940 unsigned int access, deny;
1941
1942 set_access(&access, stp->st_access_bmap);
1943 set_deny(&deny, stp->st_deny_bmap);
1944 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1945 return 0;
1946 return 1;
1947}
1948
1949/*
1950 * Called to check deny when READ with all zero stateid or
1951 * WRITE with all zero or all one stateid
1952 */
b37ad28b 1953static __be32
1da177e4
LT		 1954nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1955{
1956 struct inode *ino = current_fh->fh_dentry->d_inode;
1957 struct nfs4_file *fp;
1958 struct nfs4_stateid *stp;
b37ad28b 1959 __be32 ret;
1da177e4
LT		 1960
1961 dprintk("NFSD: nfs4_share_conflict\n");
1962
1963 fp = find_file(ino);
13cd2184
N		 1964 if (!fp)
1965 return nfs_ok;
b700949b 1966 ret = nfserr_locked;
1da177e4 1967 /* Search for conflicting share reservations */
13cd2184
N		 1968 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1969 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1970 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1971 goto out;
1da177e4 1972 }
13cd2184
N		 1973 ret = nfs_ok;
1974out:
1975 put_nfs4_file(fp);
1976 return ret;
1da177e4
LT		 1977}
1978
1979static inline void
1980nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1981{
1982 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1983 drop_file_write_access(filp);
42e49608 1984 spin_lock(&filp->f_lock);
1da177e4 1985 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
42e49608 1986 spin_unlock(&filp->f_lock);
1da177e4
LT		 1987 }
1988}
1989
1da177e4
LT		 1990/*
1991 * Spawn a thread to perform a recall on the delegation represented
1992 * by the lease (file_lock)
1993 *
1994 * Called from break_lease() with lock_kernel() held.
1995 * Note: we assume break_lease will only call this *once* for any given
1996 * lease.
1997 */
1998static
1999void nfsd_break_deleg_cb(struct file_lock *fl)
2000{
63e4863f 2001 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1da177e4
LT		 2002
2003 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2004 if (!dp)
2005 return;
2006
2007 /* We're assuming the state code never drops its reference
2008 * without first removing the lease. Since we're in this lease
2009 * callback (and since the lease code is serialized by the kernel
2010 * lock) we know the server hasn't removed the lease yet, we know
2011 * it's safe to take a reference: */
2012 atomic_inc(&dp->dl_count);
cfdcad4d 2013 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 2014
2015 spin_lock(&recall_lock);
2016 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2017 spin_unlock(&recall_lock);
2018
2019 /* only place dl_time is set. protected by lock_kernel*/
2020 dp->dl_time = get_seconds();
2021
0272e1fd
BF		 2022 /*
2023 * We don't want the locks code to timeout the lease for us;
2024 * we'll remove it ourself if the delegation isn't returned
2025 * in time.
2026 */
2027 fl->fl_break_time = 0;
1da177e4 2028
63e4863f
BF		 2029 dp->dl_file->fi_had_conflict = true;
2030 nfsd4_cb_recall(dp);
1da177e4
LT		 2031}
2032
2033/*
2034 * The file_lock is being reapd.
2035 *
2036 * Called by locks_free_lock() with lock_kernel() held.
2037 */
2038static
2039void nfsd_release_deleg_cb(struct file_lock *fl)
2040{
2041 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2042
2043 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
2044
2045 if (!(fl->fl_flags & FL_LEASE) || !dp)
2046 return;
2047 dp->dl_flock = NULL;
2048}
2049
2050/*
2051 * Set the delegation file_lock back pointer.
2052 *
a9933cea 2053 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 2054 */
2055static
2056void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
2057{
2058 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
2059
2060 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
2061 if (!dp)
2062 return;
2063 dp->dl_flock = new;
2064}
2065
2066/*
a9933cea 2067 * Called from setlease() with lock_kernel() held
1da177e4
LT		 2068 */
2069static
2070int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
2071{
2072 struct nfs4_delegation *onlistd =
2073 (struct nfs4_delegation *)onlist->fl_owner;
2074 struct nfs4_delegation *tryd =
2075 (struct nfs4_delegation *)try->fl_owner;
2076
2077 if (onlist->fl_lmops != try->fl_lmops)
2078 return 0;
2079
2080 return onlistd->dl_client == tryd->dl_client;
2081}
2082
2083
2084static
2085int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2086{
2087 if (arg & F_UNLCK)
2088 return lease_modify(onlist, arg);
2089 else
2090 return -EAGAIN;
2091}
2092
7b021967 2093static const struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 2094 .fl_break = nfsd_break_deleg_cb,
2095 .fl_release_private = nfsd_release_deleg_cb,
2096 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
2097 .fl_mylease = nfsd_same_client_deleg_cb,
2098 .fl_change = nfsd_change_deleg_cb,
2099};
2100
2101
b37ad28b 2102__be32
6668958f
AA		 2103nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2104 struct nfsd4_open *open)
1da177e4 2105{
1da177e4
LT		 2106 clientid_t *clientid = &open->op_clientid;
2107 struct nfs4_client *clp = NULL;
2108 unsigned int strhashval;
2109 struct nfs4_stateowner *sop = NULL;
2110
1da177e4 2111 if (!check_name(open->op_owner))
0f442aa2 2112 return nfserr_inval;
1da177e4
LT		 2113
2114 if (STALE_CLIENTID(&open->op_clientid))
2115 return nfserr_stale_clientid;
2116
2117 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2118 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 2119 open->op_stateowner = sop;
2120 if (!sop) {
2121 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 2122 clp = find_confirmed_client(clientid);
2123 if (clp == NULL)
0f442aa2
BF		 2124 return nfserr_expired;
2125 goto renew;
1da177e4 2126 }
6668958f
AA		 2127 /* When sessions are used, skip open sequenceid processing */
2128 if (nfsd4_has_session(cstate))
2129 goto renew;
0f442aa2
BF		 2130 if (!sop->so_confirmed) {
2131 /* Replace unconfirmed owners without checking for replay. */
2132 clp = sop->so_client;
f044ff83 2133 release_openowner(sop);
0f442aa2
BF		 2134 open->op_stateowner = NULL;
2135 goto renew;
2136 }
2137 if (open->op_seqid == sop->so_seqid - 1) {
2138 if (sop->so_replay.rp_buflen)
a90b061c 2139 return nfserr_replay_me;
0f442aa2
BF		 2140 /* The original OPEN failed so spectacularly
2141 * that we don't even have replay data saved!
2142 * Therefore, we have no choice but to continue
2143 * processing this OPEN; presumably, we'll
2144 * fail again for the same reason.
2145 */
2146 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2147 goto renew;
2148 }
2149 if (open->op_seqid != sop->so_seqid)
2150 return nfserr_bad_seqid;
1da177e4 2151renew:
0f442aa2
BF		 2152 if (open->op_stateowner == NULL) {
2153 sop = alloc_init_open_stateowner(strhashval, clp, open);
2154 if (sop == NULL)
2155 return nfserr_resource;
2156 open->op_stateowner = sop;
2157 }
2158 list_del_init(&sop->so_close_lru);
1da177e4 2159 renew_client(sop->so_client);
0f442aa2 2160 return nfs_ok;
1da177e4
LT		 2161}
2162
b37ad28b 2163static inline __be32
4a6e43e6
N		 2164nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2165{
2166 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2167 return nfserr_openmode;
2168 else
2169 return nfs_ok;
2170}
2171
52f4fb43
N		 2172static struct nfs4_delegation *
2173find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2174{
2175 struct nfs4_delegation *dp;
2176
ea1da636 2177 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 2178 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2179 return dp;
2180 }
2181 return NULL;
2182}
2183
b37ad28b 2184static __be32
567d9829
N		 2185nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2186 struct nfs4_delegation **dp)
2187{
2188 int flags;
b37ad28b 2189 __be32 status = nfserr_bad_stateid;
567d9829
N		 2190
2191 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2192 if (*dp == NULL)
c44c5eeb 2193 goto out;
567d9829
N		 2194 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
2195 RD_STATE : WR_STATE;
2196 status = nfs4_check_delegmode(*dp, flags);
2197 if (status)
2198 *dp = NULL;
c44c5eeb
N		 2199out:
2200 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2201 return nfs_ok;
2202 if (status)
2203 return status;
2204 open->op_stateowner->so_confirmed = 1;
2205 return nfs_ok;
567d9829
N		 2206}
2207
b37ad28b 2208static __be32
1da177e4
LT		 2209nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2210{
2211 struct nfs4_stateid *local;
b37ad28b 2212 __be32 status = nfserr_share_denied;
1da177e4
LT		 2213 struct nfs4_stateowner *sop = open->op_stateowner;
2214
8beefa24 2215 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 2216 /* ignore lock owners */
2217 if (local->st_stateowner->so_is_open_owner == 0)
2218 continue;
2219 /* remember if we have seen this open owner */
2220 if (local->st_stateowner == sop)
2221 *stpp = local;
2222 /* check for conflicting share reservations */
2223 if (!test_share(local, open))
2224 goto out;
2225 }
2226 status = 0;
2227out:
2228 return status;
2229}
2230
5ac049ac
N		 2231static inline struct nfs4_stateid *
2232nfs4_alloc_stateid(void)
2233{
2234 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2235}
2236
b37ad28b 2237static __be32
1da177e4 2238nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 2239 struct nfs4_delegation *dp,
1da177e4
LT		 2240 struct svc_fh *cur_fh, int flags)
2241{
2242 struct nfs4_stateid *stp;
1da177e4 2243
5ac049ac 2244 stp = nfs4_alloc_stateid();
1da177e4
LT		 2245 if (stp == NULL)
2246 return nfserr_resource;
2247
567d9829
N		 2248 if (dp) {
2249 get_file(dp->dl_vfs_file);
2250 stp->st_vfs_file = dp->dl_vfs_file;
2251 } else {
b37ad28b 2252 __be32 status;
567d9829
N		 2253 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
2254 &stp->st_vfs_file);
2255 if (status) {
2256 if (status == nfserr_dropit)
2257 status = nfserr_jukebox;
5ac049ac 2258 kmem_cache_free(stateid_slab, stp);
567d9829
N		 2259 return status;
2260 }
1da177e4 2261 }
1da177e4
LT		 2262 *stpp = stp;
2263 return 0;
2264}
2265
b37ad28b 2266static inline __be32
1da177e4
LT		 2267nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2268 struct nfsd4_open *open)
2269{
2270 struct iattr iattr = {
2271 .ia_valid = ATTR_SIZE,
2272 .ia_size = 0,
2273 };
2274 if (!open->op_truncate)
2275 return 0;
2276 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 2277 return nfserr_inval;
1da177e4
LT		 2278 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2279}
2280
b37ad28b 2281static __be32
1da177e4
LT		 2282nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2283{
2284 struct file *filp = stp->st_vfs_file;
7eaa36e2 2285 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 2286 unsigned int share_access, new_writer;
b37ad28b 2287 __be32 status;
1da177e4
LT		 2288
2289 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 2290 new_writer = (~share_access) & open->op_share_access
2291 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 2292
6c26d08f 2293 if (new_writer) {
b37ad28b
AV		 2294 int err = get_write_access(inode);
2295 if (err)
2296 return nfserrno(err);
e518f056
BH		 2297 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
2298 if (err)
2299 return nfserrno(err);
2300 file_take_write(filp);
6c26d08f 2301 }
1da177e4
LT		 2302 status = nfsd4_truncate(rqstp, cur_fh, open);
2303 if (status) {
6c26d08f
BF		 2304 if (new_writer)
2305 put_write_access(inode);
1da177e4
LT		 2306 return status;
2307 }
2308 /* remember the open */
6c26d08f 2309 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 2310 __set_bit(open->op_share_access, &stp->st_access_bmap);
2311 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 2312
2313 return nfs_ok;
2314}
2315
2316
1da177e4 2317static void
37515177 2318nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 2319{
37515177
N		 2320 open->op_stateowner->so_confirmed = 1;
2321 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 2322}
2323
2324/*
2325 * Attempt to hand out a delegation.
2326 */
2327static void
2328nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2329{
2330 struct nfs4_delegation *dp;
2331 struct nfs4_stateowner *sop = stp->st_stateowner;
c237dc03 2332 struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn;
1da177e4
LT		 2333 struct file_lock fl, *flp = &fl;
2334 int status, flag = 0;
2335
2336 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 2337 open->op_recall = 0;
2338 switch (open->op_claim_type) {
2339 case NFS4_OPEN_CLAIM_PREVIOUS:
2340 if (!atomic_read(&cb->cb_set))
2341 open->op_recall = 1;
2342 flag = open->op_delegate_type;
2343 if (flag == NFS4_OPEN_DELEGATE_NONE)
2344 goto out;
2345 break;
2346 case NFS4_OPEN_CLAIM_NULL:
2347 /* Let's not give out any delegations till everyone's
2348 * had the chance to reclaim theirs.... */
af558e33 2349 if (locks_in_grace())
7b190fec
N		 2350 goto out;
2351 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2352 goto out;
2353 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2354 flag = NFS4_OPEN_DELEGATE_WRITE;
2355 else
2356 flag = NFS4_OPEN_DELEGATE_READ;
2357 break;
2358 default:
2359 goto out;
2360 }
1da177e4
LT		 2361
2362 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2363 if (dp == NULL) {
2364 flag = NFS4_OPEN_DELEGATE_NONE;
2365 goto out;
2366 }
2367 locks_init_lock(&fl);
2368 fl.fl_lmops = &nfsd_lease_mng_ops;
2369 fl.fl_flags = FL_LEASE;
9167f501 2370 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2371 fl.fl_end = OFFSET_MAX;
2372 fl.fl_owner = (fl_owner_t)dp;
2373 fl.fl_file = stp->st_vfs_file;
2374 fl.fl_pid = current->tgid;
2375
a9933cea 2376 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2377 * the lock_manager callbacks fl_mylease and fl_change are used
2378 */
9167f501 2379 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2380 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2381 unhash_delegation(dp);
1da177e4
LT		 2382 flag = NFS4_OPEN_DELEGATE_NONE;
2383 goto out;
2384 }
2385
2386 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2387
8c10cbdb
BH		 2388 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2389 STATEID_VAL(&dp->dl_stateid));
1da177e4 2390out:
7b190fec
N		 2391 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2392 && flag == NFS4_OPEN_DELEGATE_NONE
2393 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2394 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2395 open->op_delegate_type = flag;
2396}
2397
2398/*
2399 * called with nfs4_lock_state() held.
2400 */
b37ad28b 2401__be32
1da177e4
LT		 2402nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2403{
6668958f 2404 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1da177e4
LT		 2405 struct nfs4_file *fp = NULL;
2406 struct inode *ino = current_fh->fh_dentry->d_inode;
2407 struct nfs4_stateid *stp = NULL;
567d9829 2408 struct nfs4_delegation *dp = NULL;
b37ad28b 2409 __be32 status;
1da177e4
LT		 2410
2411 status = nfserr_inval;
d87a8ade 2412 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
ba5a6a19 2413 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2414 goto out;
2415 /*
2416 * Lookup file; if found, lookup stateid and check open request,
2417 * and check for delegations in the process of being recalled.
2418 * If not found, create the nfs4_file struct
2419 */
2420 fp = find_file(ino);
2421 if (fp) {
2422 if ((status = nfs4_check_open(fp, open, &stp)))
2423 goto out;
c44c5eeb
N		 2424 status = nfs4_check_deleg(fp, open, &dp);
2425 if (status)
2426 goto out;
1da177e4 2427 } else {
c44c5eeb
N		 2428 status = nfserr_bad_stateid;
2429 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2430 goto out;
1da177e4
LT		 2431 status = nfserr_resource;
2432 fp = alloc_init_file(ino);
2433 if (fp == NULL)
2434 goto out;
2435 }
2436
2437 /*
2438 * OPEN the file, or upgrade an existing OPEN.
2439 * If truncate fails, the OPEN fails.
2440 */
2441 if (stp) {
2442 /* Stateid was found, this is an OPEN upgrade */
2443 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2444 if (status)
2445 goto out;
444c2c07 2446 update_stateid(&stp->st_stateid);
1da177e4
LT		 2447 } else {
2448 /* Stateid was not found, this is a new OPEN */
2449 int flags = 0;
9ecb6a08 2450 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2451 flags |= NFSD_MAY_READ;
1da177e4 2452 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2453 flags |= NFSD_MAY_WRITE;
567d9829
N		 2454 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2455 if (status)
1da177e4
LT		 2456 goto out;
2457 init_stateid(stp, fp, open);
2458 status = nfsd4_truncate(rqstp, current_fh, open);
2459 if (status) {
2283963f 2460 release_open_stateid(stp);
1da177e4
LT		 2461 goto out;
2462 }
6668958f
AA		 2463 if (nfsd4_has_session(&resp->cstate))
2464 update_stateid(&stp->st_stateid);
1da177e4
LT		 2465 }
2466 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2467
8b8aae40 2468 if (nfsd4_has_session(&resp->cstate)) {
6668958f 2469 open->op_stateowner->so_confirmed = 1;
8b8aae40
RL		 2470 nfsd4_create_clid_dir(open->op_stateowner->so_client);
2471 }
6668958f 2472
1da177e4
LT		 2473 /*
2474 * Attempt to hand out a delegation. No error return, because the
2475 * OPEN succeeds even if we fail.
2476 */
2477 nfs4_open_delegation(current_fh, open, stp);
2478
2479 status = nfs_ok;
2480
8c10cbdb
BH		 2481 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
2482 STATEID_VAL(&stp->st_stateid));
1da177e4 2483out:
13cd2184
N		 2484 if (fp)
2485 put_nfs4_file(fp);
37515177
N		 2486 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2487 nfs4_set_claim_prev(open);
1da177e4
LT		 2488 /*
2489 * To finish the open response, we just need to set the rflags.
2490 */
2491 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6668958f
AA		 2492 if (!open->op_stateowner->so_confirmed &&
2493 !nfsd4_has_session(&resp->cstate))
1da177e4
LT		 2494 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2495
2496 return status;
2497}
2498
b37ad28b 2499__be32
b591480b
BF		 2500nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2501 clientid_t *clid)
1da177e4
LT		 2502{
2503 struct nfs4_client *clp;
b37ad28b 2504 __be32 status;
1da177e4
LT		 2505
2506 nfs4_lock_state();
2507 dprintk("process_renew(%08x/%08x): starting\n",
2508 clid->cl_boot, clid->cl_id);
2509 status = nfserr_stale_clientid;
2510 if (STALE_CLIENTID(clid))
2511 goto out;
2512 clp = find_confirmed_client(clid);
2513 status = nfserr_expired;
2514 if (clp == NULL) {
2515 /* We assume the client took too long to RENEW. */
2516 dprintk("nfsd4_renew: clientid not found!\n");
2517 goto out;
2518 }
2519 renew_client(clp);
2520 status = nfserr_cb_path_down;
ea1da636 2521 if (!list_empty(&clp->cl_delegations)
c237dc03 2522 && !atomic_read(&clp->cl_cb_conn.cb_set))
1da177e4
LT		 2523 goto out;
2524 status = nfs_ok;
2525out:
2526 nfs4_unlock_state();
2527 return status;
2528}
2529
af558e33
BF		 2530struct lock_manager nfsd4_manager = {
2531};
2532
a76b4319 2533static void
af558e33 2534nfsd4_end_grace(void)
a76b4319
N		 2535{
2536 dprintk("NFSD: end of grace period\n");
c7b9a459 2537 nfsd4_recdir_purge_old();
af558e33 2538 locks_end_grace(&nfsd4_manager);
e46b498c
BF		 2539 /*
2540 * Now that every NFSv4 client has had the chance to recover and
2541 * to see the (possibly new, possibly shorter) lease time, we
2542 * can safely set the next grace time to the current lease time:
2543 */
2544 nfsd4_grace = nfsd4_lease;
a76b4319
N		 2545}
2546
fd39ca9a 2547static time_t
1da177e4
LT		 2548nfs4_laundromat(void)
2549{
2550 struct nfs4_client *clp;
2551 struct nfs4_stateowner *sop;
2552 struct nfs4_delegation *dp;
2553 struct list_head *pos, *next, reaplist;
cf07d2ea
BF		 2554 time_t cutoff = get_seconds() - nfsd4_lease;
2555 time_t t, clientid_val = nfsd4_lease;
2556 time_t u, test_val = nfsd4_lease;
1da177e4
LT		 2557
2558 nfs4_lock_state();
2559
2560 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2561 if (locks_in_grace())
2562 nfsd4_end_grace();
1da177e4
LT		 2563 list_for_each_safe(pos, next, &client_lru) {
2564 clp = list_entry(pos, struct nfs4_client, cl_lru);
2565 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2566 t = clp->cl_time - cutoff;
2567 if (clientid_val > t)
2568 clientid_val = t;
2569 break;
2570 }
2571 dprintk("NFSD: purging unused client (clientid %08x)\n",
2572 clp->cl_clientid.cl_id);
c7b9a459 2573 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2574 expire_client(clp);
2575 }
2576 INIT_LIST_HEAD(&reaplist);
2577 spin_lock(&recall_lock);
2578 list_for_each_safe(pos, next, &del_recall_lru) {
2579 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2580 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2581 u = dp->dl_time - cutoff;
2582 if (test_val > u)
2583 test_val = u;
2584 break;
2585 }
2586 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2587 dp, dp->dl_flock);
2588 list_move(&dp->dl_recall_lru, &reaplist);
2589 }
2590 spin_unlock(&recall_lock);
2591 list_for_each_safe(pos, next, &reaplist) {
2592 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2593 list_del_init(&dp->dl_recall_lru);
2594 unhash_delegation(dp);
2595 }
cf07d2ea 2596 test_val = nfsd4_lease;
1da177e4
LT		 2597 list_for_each_safe(pos, next, &close_lru) {
2598 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2599 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2600 u = sop->so_time - cutoff;
2601 if (test_val > u)
2602 test_val = u;
2603 break;
2604 }
2605 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2606 sop->so_id);
f044ff83 2607 release_openowner(sop);
1da177e4
LT		 2608 }
2609 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2610 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2611 nfs4_unlock_state();
2612 return clientid_val;
2613}
2614
a254b246
HH		 2615static struct workqueue_struct *laundry_wq;
2616static void laundromat_main(struct work_struct *);
2617static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2618
2619static void
c4028958 2620laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2621{
2622 time_t t;
2623
2624 t = nfs4_laundromat();
2625 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2626 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2627}
2628
fd39ca9a 2629static struct nfs4_stateowner *
f8816512
N		 2630search_close_lru(u32 st_id, int flags)
2631{
1da177e4
LT		 2632 struct nfs4_stateowner *local = NULL;
2633
1da177e4
LT		 2634 if (flags & CLOSE_STATE) {
2635 list_for_each_entry(local, &close_lru, so_close_lru) {
2636 if (local->so_id == st_id)
2637 return local;
2638 }
2639 }
2640 return NULL;
2641}
2642
2643static inline int
2644nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2645{
7eaa36e2 2646 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2647}
2648
2649static int
2650STALE_STATEID(stateid_t *stateid)
2651{
78155ed7
BN		 2652 if (time_after((unsigned long)boot_time,
2653 (unsigned long)stateid->si_boot)) {
8c10cbdb
BH		 2654 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
2655 STATEID_VAL(stateid));
78155ed7
BN		 2656 return 1;
2657 }
2658 return 0;
2659}
2660
2661static int
2662EXPIRED_STATEID(stateid_t *stateid)
2663{
2664 if (time_before((unsigned long)boot_time,
2665 ((unsigned long)stateid->si_boot)) &&
cf07d2ea 2666 time_before((unsigned long)(stateid->si_boot + nfsd4_lease), get_seconds())) {
8c10cbdb
BH		 2667 dprintk("NFSD: expired stateid " STATEID_FMT "!\n",
2668 STATEID_VAL(stateid));
78155ed7
BN		 2669 return 1;
2670 }
2671 return 0;
2672}
2673
2674static __be32
2675stateid_error_map(stateid_t *stateid)
2676{
2677 if (STALE_STATEID(stateid))
2678 return nfserr_stale_stateid;
2679 if (EXPIRED_STATEID(stateid))
2680 return nfserr_expired;
2681
8c10cbdb
BH		 2682 dprintk("NFSD: bad stateid " STATEID_FMT "!\n",
2683 STATEID_VAL(stateid));
78155ed7 2684 return nfserr_bad_stateid;
1da177e4
LT		 2685}
2686
2687static inline int
2688access_permit_read(unsigned long access_bmap)
2689{
2690 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2691 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2692 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2693}
2694
2695static inline int
2696access_permit_write(unsigned long access_bmap)
2697{
2698 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2699 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2700}
2701
2702static
b37ad28b 2703__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2704{
b37ad28b 2705 __be32 status = nfserr_openmode;
1da177e4
LT		 2706
2707 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2708 goto out;
2709 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2710 goto out;
2711 status = nfs_ok;
2712out:
2713 return status;
2714}
2715
b37ad28b 2716static inline __be32
1da177e4
LT		 2717check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2718{
203a8c8e 2719 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2720 return nfs_ok;
af558e33 2721 else if (locks_in_grace()) {
1da177e4
LT		 2722 /* Answer in remaining cases depends on existance of
2723 * conflicting state; so we must wait out the grace period. */
2724 return nfserr_grace;
2725 } else if (flags & WR_STATE)
2726 return nfs4_share_conflict(current_fh,
2727 NFS4_SHARE_DENY_WRITE);
2728 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2729 return nfs4_share_conflict(current_fh,
2730 NFS4_SHARE_DENY_READ);
2731}
2732
2733/*
2734 * Allow READ/WRITE during grace period on recovered state only for files
2735 * that are not able to provide mandatory locking.
2736 */
2737static inline int
18f82731 2738grace_disallows_io(struct inode *inode)
1da177e4 2739{
203a8c8e 2740 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2741}
2742
6668958f 2743static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
0836f587 2744{
6668958f
AA		 2745 /*
2746 * When sessions are used the stateid generation number is ignored
2747 * when it is zero.
2748 */
2749 if ((flags & HAS_SESSION) && in->si_generation == 0)
2750 goto out;
2751
0836f587
BF		 2752 /* If the client sends us a stateid from the future, it's buggy: */
2753 if (in->si_generation > ref->si_generation)
2754 return nfserr_bad_stateid;
2755 /*
2756 * The following, however, can happen. For example, if the
2757 * client sends an open and some IO at the same time, the open
2758 * may bump si_generation while the IO is still in flight.
2759 * Thanks to hard links and renames, the client never knows what
2760 * file an open will affect. So it could avoid that situation
2761 * only by serializing all opens and IO from the same open
2762 * owner. To recover from the old_stateid error, the client
2763 * will just have to retry the IO:
2764 */
2765 if (in->si_generation < ref->si_generation)
2766 return nfserr_old_stateid;
6668958f 2767out:
0836f587
BF		 2768 return nfs_ok;
2769}
2770
3e633079
BF		 2771static int is_delegation_stateid(stateid_t *stateid)
2772{
2773 return stateid->si_fileid == 0;
2774}
2775
1da177e4
LT		 2776/*
2777* Checks for stateid operations
2778*/
b37ad28b 2779__be32
dd453dfd
BH		 2780nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
2781 stateid_t *stateid, int flags, struct file **filpp)
1da177e4
LT		 2782{
2783 struct nfs4_stateid *stp = NULL;
2784 struct nfs4_delegation *dp = NULL;
dd453dfd 2785 struct svc_fh *current_fh = &cstate->current_fh;
1da177e4 2786 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2787 __be32 status;
1da177e4 2788
1da177e4
LT		 2789 if (filpp)
2790 *filpp = NULL;
2791
18f82731 2792 if (grace_disallows_io(ino))
1da177e4
LT		 2793 return nfserr_grace;
2794
6668958f
AA		 2795 if (nfsd4_has_session(cstate))
2796 flags |= HAS_SESSION;
2797
1da177e4
LT		 2798 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2799 return check_special_stateids(current_fh, stateid, flags);
2800
1da177e4
LT		 2801 status = nfserr_stale_stateid;
2802 if (STALE_STATEID(stateid))
2803 goto out;
2804
1da177e4 2805 status = nfserr_bad_stateid;
3e633079 2806 if (is_delegation_stateid(stateid)) {
a4455be0 2807 dp = find_delegation_stateid(ino, stateid);
78155ed7
BN		 2808 if (!dp) {
2809 status = stateid_error_map(stateid);
1da177e4 2810 goto out;
78155ed7 2811 }
6668958f
AA		 2812 status = check_stateid_generation(stateid, &dp->dl_stateid,
2813 flags);
0c2a498f
BF		 2814 if (status)
2815 goto out;
dc9bf700
BF		 2816 status = nfs4_check_delegmode(dp, flags);
2817 if (status)
2818 goto out;
2819 renew_client(dp->dl_client);
dc9bf700
BF		 2820 if (filpp)
2821 *filpp = dp->dl_vfs_file;
1da177e4 2822 } else { /* open or lock stateid */
a4455be0 2823 stp = find_stateid(stateid, flags);
78155ed7
BN		 2824 if (!stp) {
2825 status = stateid_error_map(stateid);
1da177e4 2826 goto out;
78155ed7 2827 }
6150ef0d 2828 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2829 goto out;
2830 if (!stp->st_stateowner->so_confirmed)
2831 goto out;
6668958f
AA		 2832 status = check_stateid_generation(stateid, &stp->st_stateid,
2833 flags);
0c2a498f
BF		 2834 if (status)
2835 goto out;
a4455be0
BF		 2836 status = nfs4_check_openmode(stp, flags);
2837 if (status)
1da177e4
LT		 2838 goto out;
2839 renew_client(stp->st_stateowner->so_client);
2840 if (filpp)
2841 *filpp = stp->st_vfs_file;
1da177e4
LT		 2842 }
2843 status = nfs_ok;
2844out:
2845 return status;
2846}
2847
4c4cd222
N		 2848static inline int
2849setlkflg (int type)
2850{
2851 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2852 RD_STATE : WR_STATE;
2853}
1da177e4
LT		 2854
2855/*
2856 * Checks for sequence id mutating operations.
2857 */
b37ad28b 2858static __be32
dd453dfd
BH		 2859nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
2860 stateid_t *stateid, int flags,
2861 struct nfs4_stateowner **sopp,
2862 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2863{
1da177e4
LT		 2864 struct nfs4_stateid *stp;
2865 struct nfs4_stateowner *sop;
dd453dfd 2866 struct svc_fh *current_fh = &cstate->current_fh;
0836f587 2867 __be32 status;
1da177e4 2868
8c10cbdb
BH		 2869 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
2870 seqid, STATEID_VAL(stateid));
3a4f98bb 2871
1da177e4
LT		 2872 *stpp = NULL;
2873 *sopp = NULL;
2874
1da177e4 2875 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2876 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2877 return nfserr_bad_stateid;
1da177e4
LT		 2878 }
2879
1da177e4 2880 if (STALE_STATEID(stateid))
3a4f98bb 2881 return nfserr_stale_stateid;
6668958f
AA		 2882
2883 if (nfsd4_has_session(cstate))
2884 flags |= HAS_SESSION;
2885
1da177e4
LT		 2886 /*
2887 * We return BAD_STATEID if filehandle doesn't match stateid,
2888 * the confirmed flag is incorrecly set, or the generation
2889 * number is incorrect.
1da177e4 2890 */
f8816512
N		 2891 stp = find_stateid(stateid, flags);
2892 if (stp == NULL) {
2893 /*
2894 * Also, we should make sure this isn't just the result of
2895 * a replayed close:
2896 */
2897 sop = search_close_lru(stateid->si_stateownerid, flags);
2898 if (sop == NULL)
78155ed7 2899 return stateid_error_map(stateid);
f8816512
N		 2900 *sopp = sop;
2901 goto check_replay;
2902 }
1da177e4 2903
39325bd0
BF		 2904 *stpp = stp;
2905 *sopp = sop = stp->st_stateowner;
2906
4c4cd222 2907 if (lock) {
4c4cd222 2908 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2909 struct nfs4_client *clp = sop->so_client;
4c4cd222 2910 int lkflg = 0;
b37ad28b 2911 __be32 status;
4c4cd222
N		 2912
2913 lkflg = setlkflg(lock->lk_type);
2914
2915 if (lock->lk_is_new) {
599e0a22
BF		 2916 if (!sop->so_is_open_owner)
2917 return nfserr_bad_stateid;
60adfc50
AA		 2918 if (!(flags & HAS_SESSION) &&
2919 !same_clid(&clp->cl_clientid, lockclid))
2920 return nfserr_bad_stateid;
599e0a22
BF		 2921 /* stp is the open stateid */
2922 status = nfs4_check_openmode(stp, lkflg);
2923 if (status)
2924 return status;
2925 } else {
2926 /* stp is the lock stateid */
2927 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2928 if (status)
2929 return status;
4c4cd222 2930 }
1da177e4
LT		 2931 }
2932
f3362737 2933 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2934 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2935 return nfserr_bad_stateid;
1da177e4
LT		 2936 }
2937
1da177e4
LT		 2938 /*
2939 * We now validate the seqid and stateid generation numbers.
2940 * For the moment, we ignore the possibility of
2941 * generation number wraparound.
2942 */
6668958f 2943 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
1da177e4
LT		 2944 goto check_replay;
2945
3a4f98bb 2946 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2947 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2948 " unconfirmed stateowner!\n");
2949 return nfserr_bad_stateid;
1da177e4 2950 }
3a4f98bb 2951 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2952 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2953 " confirmed yet!\n");
2954 return nfserr_bad_stateid;
1da177e4 2955 }
6668958f 2956 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
0836f587
BF		 2957 if (status)
2958 return status;
52fd004e 2959 renew_client(sop->so_client);
3a4f98bb 2960 return nfs_ok;
1da177e4 2961
1da177e4 2962check_replay:
bd9aac52 2963 if (seqid == sop->so_seqid - 1) {
849823c5 2964 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2965 /* indicate replay to calling function */
a90b061c 2966 return nfserr_replay_me;
1da177e4 2967 }
2fdada03 2968 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2969 sop->so_seqid, seqid);
2970 *sopp = NULL;
2971 return nfserr_bad_seqid;
1da177e4
LT		 2972}
2973
b37ad28b 2974__be32
ca364317 2975nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2976 struct nfsd4_open_confirm *oc)
1da177e4 2977{
b37ad28b 2978 __be32 status;
1da177e4
LT		 2979 struct nfs4_stateowner *sop;
2980 struct nfs4_stateid *stp;
2981
2982 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2983 (int)cstate->current_fh.fh_dentry->d_name.len,
2984 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2985
ca364317 2986 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2987 if (status)
2988 return status;
1da177e4
LT		 2989
2990 nfs4_lock_state();
2991
dd453dfd 2992 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 2993 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2994 CONFIRM | OPEN_STATE,
1da177e4
LT		 2995 &oc->oc_stateowner, &stp, NULL)))
2996 goto out;
2997
2998 sop = oc->oc_stateowner;
2999 sop->so_confirmed = 1;
3000 update_stateid(&stp->st_stateid);
3001 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
8c10cbdb
BH		 3002 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3003 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid));
c7b9a459
N		 3004
3005 nfsd4_create_clid_dir(sop->so_client);
1da177e4 3006out:
f2327d9a 3007 if (oc->oc_stateowner) {
1da177e4 3008 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 3009 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 3010 }
1da177e4
LT		 3011 nfs4_unlock_state();
3012 return status;
3013}
3014
3015
3016/*
3017 * unset all bits in union bitmap (bmap) that
3018 * do not exist in share (from successful OPEN_DOWNGRADE)
3019 */
3020static void
3021reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3022{
3023 int i;
3024 for (i = 1; i < 4; i++) {
3025 if ((i & access) != i)
3026 __clear_bit(i, bmap);
3027 }
3028}
3029
3030static void
3031reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3032{
3033 int i;
3034 for (i = 0; i < 4; i++) {
3035 if ((i & deny) != i)
3036 __clear_bit(i, bmap);
3037 }
3038}
3039
b37ad28b 3040__be32
ca364317
BF		 3041nfsd4_open_downgrade(struct svc_rqst *rqstp,
3042 struct nfsd4_compound_state *cstate,
a4f1706a 3043 struct nfsd4_open_downgrade *od)
1da177e4 3044{
b37ad28b 3045 __be32 status;
1da177e4
LT		 3046 struct nfs4_stateid *stp;
3047 unsigned int share_access;
3048
3049 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 3050 (int)cstate->current_fh.fh_dentry->d_name.len,
3051 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3052
d87a8ade 3053 if (!access_valid(od->od_share_access, cstate->minorversion)
ba5a6a19 3054 || !deny_valid(od->od_share_deny))
1da177e4
LT		 3055 return nfserr_inval;
3056
3057 nfs4_lock_state();
dd453dfd 3058 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3059 od->od_seqid,
1da177e4 3060 &od->od_stateid,
f3362737 3061 OPEN_STATE,
1da177e4
LT		 3062 &od->od_stateowner, &stp, NULL)))
3063 goto out;
3064
3065 status = nfserr_inval;
3066 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3067 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3068 stp->st_access_bmap, od->od_share_access);
3069 goto out;
3070 }
3071 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3072 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3073 stp->st_deny_bmap, od->od_share_deny);
3074 goto out;
3075 }
3076 set_access(&share_access, stp->st_access_bmap);
3077 nfs4_file_downgrade(stp->st_vfs_file,
3078 share_access & ~od->od_share_access);
3079
3080 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3081 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3082
3083 update_stateid(&stp->st_stateid);
3084 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3085 status = nfs_ok;
3086out:
f2327d9a 3087 if (od->od_stateowner) {
1da177e4 3088 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 3089 cstate->replay_owner = od->od_stateowner;
f2327d9a 3090 }
1da177e4
LT		 3091 nfs4_unlock_state();
3092 return status;
3093}
3094
3095/*
3096 * nfs4_unlock_state() called after encode
3097 */
b37ad28b 3098__be32
ca364317 3099nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3100 struct nfsd4_close *close)
1da177e4 3101{
b37ad28b 3102 __be32 status;
1da177e4
LT		 3103 struct nfs4_stateid *stp;
3104
3105 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 3106 (int)cstate->current_fh.fh_dentry->d_name.len,
3107 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 3108
3109 nfs4_lock_state();
3110 /* check close_lru for replay */
dd453dfd 3111 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3112 close->cl_seqid,
1da177e4 3113 &close->cl_stateid,
f3362737 3114 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 3115 &close->cl_stateowner, &stp, NULL)))
3116 goto out;
1da177e4
LT		 3117 status = nfs_ok;
3118 update_stateid(&stp->st_stateid);
3119 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3120
04ef5954 3121 /* release_stateid() calls nfsd_close() if needed */
2283963f 3122 release_open_stateid(stp);
04ef5954
BF		 3123
3124 /* place unused nfs4_stateowners on so_close_lru list to be
3125 * released by the laundromat service after the lease period
3126 * to enable us to handle CLOSE replay
3127 */
3128 if (list_empty(&close->cl_stateowner->so_stateids))
3129 move_to_close_lru(close->cl_stateowner);
1da177e4 3130out:
f2327d9a 3131 if (close->cl_stateowner) {
1da177e4 3132 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 3133 cstate->replay_owner = close->cl_stateowner;
f2327d9a 3134 }
1da177e4
LT		 3135 nfs4_unlock_state();
3136 return status;
3137}
3138
b37ad28b 3139__be32
ca364317
BF		 3140nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3141 struct nfsd4_delegreturn *dr)
1da177e4 3142{
203a8c8e
BF		 3143 struct nfs4_delegation *dp;
3144 stateid_t *stateid = &dr->dr_stateid;
3145 struct inode *inode;
b37ad28b 3146 __be32 status;
6668958f 3147 int flags = 0;
1da177e4 3148
ca364317 3149 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 3150 return status;
3151 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4 3152
6668958f
AA		 3153 if (nfsd4_has_session(cstate))
3154 flags |= HAS_SESSION;
1da177e4 3155 nfs4_lock_state();
203a8c8e
BF		 3156 status = nfserr_bad_stateid;
3157 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3158 goto out;
3159 status = nfserr_stale_stateid;
3160 if (STALE_STATEID(stateid))
3161 goto out;
7e0f7cf5 3162 status = nfserr_bad_stateid;
203a8c8e
BF		 3163 if (!is_delegation_stateid(stateid))
3164 goto out;
203a8c8e 3165 dp = find_delegation_stateid(inode, stateid);
78155ed7
BN		 3166 if (!dp) {
3167 status = stateid_error_map(stateid);
203a8c8e 3168 goto out;
78155ed7 3169 }
6668958f 3170 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
203a8c8e
BF		 3171 if (status)
3172 goto out;
3173 renew_client(dp->dl_client);
3174
3175 unhash_delegation(dp);
1da177e4 3176out:
203a8c8e
BF		 3177 nfs4_unlock_state();
3178
1da177e4
LT		 3179 return status;
3180}
3181
3182
3183/*
3184 * Lock owner state (byte-range locks)
3185 */
3186#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3187#define LOCK_HASH_BITS 8
3188#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3189#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3190
87df4de8
BH		 3191static inline u64
3192end_offset(u64 start, u64 len)
3193{
3194 u64 end;
3195
3196 end = start + len;
3197 return end >= start ? end: NFS4_MAX_UINT64;
3198}
3199
3200/* last octet in a range */
3201static inline u64
3202last_byte_offset(u64 start, u64 len)
3203{
3204 u64 end;
3205
3206 BUG_ON(!len);
3207 end = start + len;
3208 return end > start ? end - 1: NFS4_MAX_UINT64;
3209}
3210
1da177e4
LT		 3211#define lockownerid_hashval(id) \
3212 ((id) & LOCK_HASH_MASK)
3213
3214static inline unsigned int
3215lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3216 struct xdr_netobj *ownername)
3217{
3218 return (file_hashval(inode) + cl_id
3219 + opaque_hashval(ownername->data, ownername->len))
3220 & LOCK_HASH_MASK;
3221}
3222
3223static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3224static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3225static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3226
fd39ca9a 3227static struct nfs4_stateid *
1da177e4
LT		 3228find_stateid(stateid_t *stid, int flags)
3229{
9346eff0 3230 struct nfs4_stateid *local;
1da177e4
LT		 3231 u32 st_id = stid->si_stateownerid;
3232 u32 f_id = stid->si_fileid;
3233 unsigned int hashval;
3234
3235 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 3236 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3237 hashval = stateid_hashval(st_id, f_id);
3238 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3239 if ((local->st_stateid.si_stateownerid == st_id) &&
3240 (local->st_stateid.si_fileid == f_id))
3241 return local;
3242 }
3243 }
9346eff0
KK		 3244
3245 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3246 hashval = stateid_hashval(st_id, f_id);
3247 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3248 if ((local->st_stateid.si_stateownerid == st_id) &&
3249 (local->st_stateid.si_fileid == f_id))
3250 return local;
3251 }
849823c5 3252 }
1da177e4
LT		 3253 return NULL;
3254}
3255
3256static struct nfs4_delegation *
3257find_delegation_stateid(struct inode *ino, stateid_t *stid)
3258{
13cd2184
N		 3259 struct nfs4_file *fp;
3260 struct nfs4_delegation *dl;
1da177e4 3261
8c10cbdb
BH		 3262 dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__,
3263 STATEID_VAL(stid));
1da177e4 3264
1da177e4 3265 fp = find_file(ino);
13cd2184
N		 3266 if (!fp)
3267 return NULL;
3268 dl = find_delegation_file(fp, stid);
3269 put_nfs4_file(fp);
3270 return dl;
1da177e4
LT		 3271}
3272
3273/*
3274 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3275 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3276 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3277 * locking, this prevents us from being completely protocol-compliant. The
3278 * real solution to this problem is to start using unsigned file offsets in
3279 * the VFS, but this is a very deep change!
3280 */
3281static inline void
3282nfs4_transform_lock_offset(struct file_lock *lock)
3283{
3284 if (lock->fl_start < 0)
3285 lock->fl_start = OFFSET_MAX;
3286 if (lock->fl_end < 0)
3287 lock->fl_end = OFFSET_MAX;
3288}
3289
d5b9026a
N		 3290/* Hack!: For now, we're defining this just so we can use a pointer to it
3291 * as a unique cookie to identify our (NFSv4's) posix locks. */
7b021967 3292static const struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 3293};
1da177e4
LT		 3294
3295static inline void
3296nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3297{
d5b9026a
N		 3298 struct nfs4_stateowner *sop;
3299 unsigned int hval;
1da177e4 3300
d5b9026a
N		 3301 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3302 sop = (struct nfs4_stateowner *) fl->fl_owner;
3303 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 3304 kref_get(&sop->so_ref);
3305 deny->ld_sop = sop;
3306 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 3307 } else {
3308 deny->ld_sop = NULL;
3309 deny->ld_clientid.cl_boot = 0;
3310 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 3311 }
3312 deny->ld_start = fl->fl_start;
87df4de8
BH		 3313 deny->ld_length = NFS4_MAX_UINT64;
3314 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 3315 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3316 deny->ld_type = NFS4_READ_LT;
3317 if (fl->fl_type != F_RDLCK)
3318 deny->ld_type = NFS4_WRITE_LT;
3319}
3320
1da177e4
LT		 3321static struct nfs4_stateowner *
3322find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3323 struct xdr_netobj *owner)
3324{
3325 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3326 struct nfs4_stateowner *op;
3327
3328 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 3329 if (same_owner_str(op, owner, clid))
1da177e4
LT		 3330 return op;
3331 }
3332 return NULL;
3333}
3334
3335/*
3336 * Alloc a lock owner structure.
3337 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3338 * occured.
3339 *
3340 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 3341 */
3342
3343static struct nfs4_stateowner *
3344alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3345 struct nfs4_stateowner *sop;
3346 struct nfs4_replay *rp;
3347 unsigned int idhashval;
3348
3349 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3350 return NULL;
3351 idhashval = lockownerid_hashval(current_ownerid);
3352 INIT_LIST_HEAD(&sop->so_idhash);
3353 INIT_LIST_HEAD(&sop->so_strhash);
3354 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 3355 INIT_LIST_HEAD(&sop->so_stateids);
3356 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 3357 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3358 sop->so_time = 0;
3359 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3360 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 3361 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 3362 sop->so_is_open_owner = 0;
3363 sop->so_id = current_ownerid++;
3364 sop->so_client = clp;
b59e3c0e
NB		 3365 /* It is the openowner seqid that will be incremented in encode in the
3366 * case of new lockowners; so increment the lock seqid manually: */
3367 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 3368 sop->so_confirmed = 1;
3369 rp = &sop->so_replay;
de1ae286 3370 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 3371 rp->rp_buflen = 0;
3372 rp->rp_buf = rp->rp_ibuf;
3373 return sop;
3374}
3375
fd39ca9a 3376static struct nfs4_stateid *
1da177e4
LT		 3377alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3378{
3379 struct nfs4_stateid *stp;
3380 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3381
5ac049ac
N		 3382 stp = nfs4_alloc_stateid();
3383 if (stp == NULL)
1da177e4
LT		 3384 goto out;
3385 INIT_LIST_HEAD(&stp->st_hash);
3386 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 3387 INIT_LIST_HEAD(&stp->st_perstateowner);
3388 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 3389 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 3390 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 3391 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 3392 stp->st_stateowner = sop;
13cd2184 3393 get_nfs4_file(fp);
1da177e4 3394 stp->st_file = fp;
78155ed7 3395 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 3396 stp->st_stateid.si_stateownerid = sop->so_id;
3397 stp->st_stateid.si_fileid = fp->fi_id;
3398 stp->st_stateid.si_generation = 0;
3399 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
3400 stp->st_access_bmap = open_stp->st_access_bmap;
3401 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 3402 stp->st_openstp = open_stp;
1da177e4
LT		 3403
3404out:
3405 return stp;
3406}
3407
fd39ca9a 3408static int
1da177e4
LT		 3409check_lock_length(u64 offset, u64 length)
3410{
87df4de8 3411 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3412 LOFF_OVERFLOW(offset, length)));
3413}
3414
3415/*
3416 * LOCK operation
3417 */
b37ad28b 3418__be32
ca364317 3419nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3420 struct nfsd4_lock *lock)
1da177e4 3421{
3e9e3dbe 3422 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3423 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3424 struct nfs4_stateid *lock_stp;
3425 struct file *filp;
3426 struct file_lock file_lock;
8dc7c311 3427 struct file_lock conflock;
b37ad28b 3428 __be32 status = 0;
1da177e4 3429 unsigned int strhashval;
150b3934 3430 unsigned int cmd;
b8dd7b9a 3431 int err;
1da177e4
LT		 3432
3433 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3434 (long long) lock->lk_offset,
3435 (long long) lock->lk_length);
3436
1da177e4
LT		 3437 if (check_lock_length(lock->lk_offset, lock->lk_length))
3438 return nfserr_inval;
3439
ca364317 3440 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3441 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3442 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3443 return status;
3444 }
3445
1da177e4
LT		 3446 nfs4_lock_state();
3447
3448 if (lock->lk_is_new) {
893f8770
N		 3449 /*
3450 * Client indicates that this is a new lockowner.
3451 * Use open owner and open stateid to create lock owner and
3452 * lock stateid.
3453 */
1da177e4
LT		 3454 struct nfs4_stateid *open_stp = NULL;
3455 struct nfs4_file *fp;
3456
3457 status = nfserr_stale_clientid;
60adfc50
AA		 3458 if (!nfsd4_has_session(cstate) &&
3459 STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3460 goto out;
1da177e4 3461
1da177e4 3462 /* validate and update open stateid and open seqid */
dd453dfd 3463 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3464 lock->lk_new_open_seqid,
3465 &lock->lk_new_open_stateid,
f3362737 3466 OPEN_STATE,
3a65588a 3467 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3468 lock);
37515177 3469 if (status)
1da177e4 3470 goto out;
3a65588a 3471 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3472 /* create lockowner and lock stateid */
3473 fp = open_stp->st_file;
3474 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3475 open_sop->so_client->cl_clientid.cl_id,
3476 &lock->v.new.owner);
3e9e3dbe
N		 3477 /* XXX: Do we need to check for duplicate stateowners on
3478 * the same file, or should they just be allowed (and
3479 * create new stateids)? */
1da177e4 3480 status = nfserr_resource;
b59e3c0e
NB		 3481 lock_sop = alloc_init_lock_stateowner(strhashval,
3482 open_sop->so_client, open_stp, lock);
3483 if (lock_sop == NULL)
1da177e4 3484 goto out;
b59e3c0e 3485 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3486 if (lock_stp == NULL)
1da177e4 3487 goto out;
1da177e4
LT		 3488 } else {
3489 /* lock (lock owner + lock stateid) already exists */
dd453dfd 3490 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3491 lock->lk_old_lock_seqid,
3492 &lock->lk_old_lock_stateid,
f3362737 3493 LOCK_STATE,
3a65588a 3494 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3495 if (status)
3496 goto out;
3a65588a 3497 lock_sop = lock->lk_replay_owner;
1da177e4 3498 }
3a65588a 3499 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3500 filp = lock_stp->st_vfs_file;
3501
0dd395dc 3502 status = nfserr_grace;
af558e33 3503 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3504 goto out;
3505 status = nfserr_no_grace;
af558e33 3506 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3507 goto out;
3508
1da177e4
LT		 3509 locks_init_lock(&file_lock);
3510 switch (lock->lk_type) {
3511 case NFS4_READ_LT:
3512 case NFS4_READW_LT:
3513 file_lock.fl_type = F_RDLCK;
150b3934 3514 cmd = F_SETLK;
1da177e4
LT		 3515 break;
3516 case NFS4_WRITE_LT:
3517 case NFS4_WRITEW_LT:
3518 file_lock.fl_type = F_WRLCK;
150b3934 3519 cmd = F_SETLK;
1da177e4
LT		 3520 break;
3521 default:
3522 status = nfserr_inval;
3523 goto out;
3524 }
b59e3c0e 3525 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3526 file_lock.fl_pid = current->tgid;
3527 file_lock.fl_file = filp;
3528 file_lock.fl_flags = FL_POSIX;
d5b9026a 3529 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3530
3531 file_lock.fl_start = lock->lk_offset;
87df4de8 3532 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3533 nfs4_transform_lock_offset(&file_lock);
3534
3535 /*
3536 * Try to lock the file in the VFS.
3537 * Note: locks.c uses the BKL to protect the inode's lock list.
3538 */
3539
fd85b817 3540 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3541 switch (-err) {
1da177e4
LT		 3542 case 0: /* success! */
3543 update_stateid(&lock_stp->st_stateid);
3544 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3545 sizeof(stateid_t));
b8dd7b9a 3546 status = 0;
eb76b3fd
AA		 3547 break;
3548 case (EAGAIN): /* conflock holds conflicting lock */
3549 status = nfserr_denied;
3550 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3551 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3552 break;
1da177e4
LT		 3553 case (EDEADLK):
3554 status = nfserr_deadlock;
eb76b3fd 3555 break;
1da177e4 3556 default:
fd85b817 3557 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3558 status = nfserr_resource;
3559 break;
1da177e4 3560 }
1da177e4 3561out:
8a280510 3562 if (status && lock->lk_is_new && lock_sop)
f044ff83 3563 release_lockowner(lock_sop);
3a65588a
BF		 3564 if (lock->lk_replay_owner) {
3565 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3566 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3567 }
1da177e4
LT		 3568 nfs4_unlock_state();
3569 return status;
3570}
3571
55ef1274
BF		 3572/*
3573 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3574 * so we do a temporary open here just to get an open file to pass to
3575 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3576 * inode operation.)
3577 */
3578static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3579{
3580 struct file *file;
3581 int err;
3582
3583 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3584 if (err)
3585 return err;
3586 err = vfs_test_lock(file, lock);
3587 nfsd_close(file);
3588 return err;
3589}
3590
1da177e4
LT		 3591/*
3592 * LOCKT operation
3593 */
b37ad28b 3594__be32
ca364317
BF		 3595nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3596 struct nfsd4_lockt *lockt)
1da177e4
LT		 3597{
3598 struct inode *inode;
1da177e4 3599 struct file_lock file_lock;
fd85b817 3600 int error;
b37ad28b 3601 __be32 status;
1da177e4 3602
af558e33 3603 if (locks_in_grace())
1da177e4
LT		 3604 return nfserr_grace;
3605
3606 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3607 return nfserr_inval;
3608
3609 lockt->lt_stateowner = NULL;
3610 nfs4_lock_state();
3611
3612 status = nfserr_stale_clientid;
60adfc50 3613 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3614 goto out;
1da177e4 3615
ca364317 3616 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3617 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3618 if (status == nfserr_symlink)
3619 status = nfserr_inval;
3620 goto out;
3621 }
3622
ca364317 3623 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3624 locks_init_lock(&file_lock);
3625 switch (lockt->lt_type) {
3626 case NFS4_READ_LT:
3627 case NFS4_READW_LT:
3628 file_lock.fl_type = F_RDLCK;
3629 break;
3630 case NFS4_WRITE_LT:
3631 case NFS4_WRITEW_LT:
3632 file_lock.fl_type = F_WRLCK;
3633 break;
3634 default:
2fdada03 3635 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3636 status = nfserr_inval;
3637 goto out;
3638 }
3639
3640 lockt->lt_stateowner = find_lockstateowner_str(inode,
3641 &lockt->lt_clientid, &lockt->lt_owner);
3642 if (lockt->lt_stateowner)
3643 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3644 file_lock.fl_pid = current->tgid;
3645 file_lock.fl_flags = FL_POSIX;
3646
3647 file_lock.fl_start = lockt->lt_offset;
87df4de8 3648 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3649
3650 nfs4_transform_lock_offset(&file_lock);
3651
1da177e4 3652 status = nfs_ok;
55ef1274 3653 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3654 if (error) {
3655 status = nfserrno(error);
3656 goto out;
3657 }
9d6a8c5c 3658 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3659 status = nfserr_denied;
9d6a8c5c 3660 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3661 }
3662out:
3663 nfs4_unlock_state();
3664 return status;
3665}
3666
b37ad28b 3667__be32
ca364317 3668nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3669 struct nfsd4_locku *locku)
1da177e4
LT		 3670{
3671 struct nfs4_stateid *stp;
3672 struct file *filp = NULL;
3673 struct file_lock file_lock;
b37ad28b 3674 __be32 status;
b8dd7b9a 3675 int err;
1da177e4
LT		 3676
3677 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3678 (long long) locku->lu_offset,
3679 (long long) locku->lu_length);
3680
3681 if (check_lock_length(locku->lu_offset, locku->lu_length))
3682 return nfserr_inval;
3683
3684 nfs4_lock_state();
3685
dd453dfd 3686 if ((status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3687 locku->lu_seqid,
3688 &locku->lu_stateid,
f3362737 3689 LOCK_STATE,
1da177e4
LT		 3690 &locku->lu_stateowner, &stp, NULL)))
3691 goto out;
3692
3693 filp = stp->st_vfs_file;
3694 BUG_ON(!filp);
3695 locks_init_lock(&file_lock);
3696 file_lock.fl_type = F_UNLCK;
3697 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3698 file_lock.fl_pid = current->tgid;
3699 file_lock.fl_file = filp;
3700 file_lock.fl_flags = FL_POSIX;
d5b9026a 3701 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3702 file_lock.fl_start = locku->lu_offset;
3703
87df4de8 3704 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3705 nfs4_transform_lock_offset(&file_lock);
3706
3707 /*
3708 * Try to unlock the file in the VFS.
3709 */
fd85b817 3710 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3711 if (err) {
fd85b817 3712 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3713 goto out_nfserr;
3714 }
3715 /*
3716 * OK, unlock succeeded; the only thing left to do is update the stateid.
3717 */
3718 update_stateid(&stp->st_stateid);
3719 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3720
3721out:
f2327d9a 3722 if (locku->lu_stateowner) {
1da177e4 3723 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3724 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3725 }
1da177e4
LT		 3726 nfs4_unlock_state();
3727 return status;
3728
3729out_nfserr:
b8dd7b9a 3730 status = nfserrno(err);
1da177e4
LT		 3731 goto out;
3732}
3733
3734/*
3735 * returns
3736 * 1: locks held by lockowner
3737 * 0: no locks held by lockowner
3738 */
3739static int
3740check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3741{
3742 struct file_lock **flpp;
7eaa36e2 3743 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3744 int status = 0;
3745
3746 lock_kernel();
3747 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3748 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3749 status = 1;
3750 goto out;
796dadfd 3751 }
1da177e4
LT		 3752 }
3753out:
3754 unlock_kernel();
3755 return status;
3756}
3757
b37ad28b 3758__be32
b591480b
BF		 3759nfsd4_release_lockowner(struct svc_rqst *rqstp,
3760 struct nfsd4_compound_state *cstate,
3761 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3762{
3763 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3764 struct nfs4_stateowner *sop;
3765 struct nfs4_stateid *stp;
1da177e4 3766 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3767 struct list_head matches;
3768 int i;
b37ad28b 3769 __be32 status;
1da177e4
LT		 3770
3771 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3772 clid->cl_boot, clid->cl_id);
3773
3774 /* XXX check for lease expiration */
3775
3776 status = nfserr_stale_clientid;
849823c5 3777 if (STALE_CLIENTID(clid))
1da177e4 3778 return status;
1da177e4
LT		 3779
3780 nfs4_lock_state();
3781
3e9e3dbe
N		 3782 status = nfserr_locks_held;
3783 /* XXX: we're doing a linear search through all the lockowners.
3784 * Yipes! For now we'll just hope clients aren't really using
3785 * release_lockowner much, but eventually we have to fix these
3786 * data structures. */
3787 INIT_LIST_HEAD(&matches);
3788 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3789 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3790 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3791 continue;
3792 list_for_each_entry(stp, &sop->so_stateids,
3793 st_perstateowner) {
3794 if (check_for_locks(stp->st_vfs_file, sop))
3795 goto out;
3796 /* Note: so_perclient unused for lockowners,
3797 * so it's OK to fool with here. */
3798 list_add(&sop->so_perclient, &matches);
3799 }
1da177e4 3800 }
3e9e3dbe
N		 3801 }
3802 /* Clients probably won't expect us to return with some (but not all)
3803 * of the lockowner state released; so don't release any until all
3804 * have been checked. */
3805 status = nfs_ok;
0fa822e4
N		 3806 while (!list_empty(&matches)) {
3807 sop = list_entry(matches.next, struct nfs4_stateowner,
3808 so_perclient);
3809 /* unhash_stateowner deletes so_perclient only
3810 * for openowners. */
3811 list_del(&sop->so_perclient);
f044ff83 3812 release_lockowner(sop);
1da177e4
LT		 3813 }
3814out:
3815 nfs4_unlock_state();
3816 return status;
3817}
3818
3819static inline struct nfs4_client_reclaim *
a55370a3 3820alloc_reclaim(void)
1da177e4 3821{
a55370a3 3822 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3823}
3824
c7b9a459 3825int
a1bcecd2 3826nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3827{
3828 unsigned int strhashval = clientstr_hashval(name);
3829 struct nfs4_client *clp;
3830
a1bcecd2 3831 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3832 return clp ? 1 : 0;
3833}
3834
1da177e4
LT		 3835/*
3836 * failure => all reset bets are off, nfserr_no_grace...
3837 */
190e4fbf
N		 3838int
3839nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3840{
3841 unsigned int strhashval;
3842 struct nfs4_client_reclaim *crp = NULL;
3843
a55370a3
N		 3844 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3845 crp = alloc_reclaim();
1da177e4
LT		 3846 if (!crp)
3847 return 0;
a55370a3 3848 strhashval = clientstr_hashval(name);
1da177e4
LT		 3849 INIT_LIST_HEAD(&crp->cr_strhash);
3850 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3851 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3852 reclaim_str_hashtbl_size++;
3853 return 1;
3854}
3855
3856static void
3857nfs4_release_reclaim(void)
3858{
3859 struct nfs4_client_reclaim *crp = NULL;
3860 int i;
3861
1da177e4
LT		 3862 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3863 while (!list_empty(&reclaim_str_hashtbl[i])) {
3864 crp = list_entry(reclaim_str_hashtbl[i].next,
3865 struct nfs4_client_reclaim, cr_strhash);
3866 list_del(&crp->cr_strhash);
1da177e4
LT		 3867 kfree(crp);
3868 reclaim_str_hashtbl_size--;
3869 }
3870 }
3871 BUG_ON(reclaim_str_hashtbl_size);
3872}
3873
3874/*
3875 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3876static struct nfs4_client_reclaim *
1da177e4
LT		 3877nfs4_find_reclaim_client(clientid_t *clid)
3878{
3879 unsigned int strhashval;
3880 struct nfs4_client *clp;
3881 struct nfs4_client_reclaim *crp = NULL;
3882
3883
3884 /* find clientid in conf_id_hashtbl */
3885 clp = find_confirmed_client(clid);
3886 if (clp == NULL)
3887 return NULL;
3888
a55370a3
N		 3889 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3890 clp->cl_name.len, clp->cl_name.data,
3891 clp->cl_recdir);
1da177e4
LT		 3892
3893 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3894 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3895 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3896 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3897 return crp;
3898 }
3899 }
3900 return NULL;
3901}
3902
3903/*
3904* Called from OPEN. Look for clientid in reclaim list.
3905*/
b37ad28b 3906__be32
1da177e4
LT		 3907nfs4_check_open_reclaim(clientid_t *clid)
3908{
dfc83565 3909 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3910}
3911
ac4d8ff2 3912/* initialization to perform at module load time: */
1da177e4 3913
e8ff2a84 3914int
ac4d8ff2 3915nfs4_state_init(void)
1da177e4 3916{
e8ff2a84 3917 int i, status;
1da177e4 3918
e8ff2a84
BF		 3919 status = nfsd4_init_slabs();
3920 if (status)
3921 return status;
1da177e4
LT		 3922 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3923 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3924 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3925 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3926 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
02cb2858 3927 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
1da177e4 3928 }
5282fd72
ME		 3929 for (i = 0; i < SESSION_HASH_SIZE; i++)
3930 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3931 for (i = 0; i < FILE_HASH_SIZE; i++) {
3932 INIT_LIST_HEAD(&file_hashtbl[i]);
3933 }
3934 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3935 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3936 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3937 }
3938 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3939 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3940 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3941 }
3942 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3943 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3944 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3945 }
1da177e4 3946 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3947 INIT_LIST_HEAD(&close_lru);
3948 INIT_LIST_HEAD(&client_lru);
3949 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2 3950 reclaim_str_hashtbl_size = 0;
e8ff2a84 3951 return 0;
ac4d8ff2
N		 3952}
3953
190e4fbf
N		 3954static void
3955nfsd4_load_reboot_recovery_data(void)
3956{
3957 int status;
3958
0964a3d3
N		 3959 nfs4_lock_state();
3960 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3961 status = nfsd4_recdir_load();
0964a3d3 3962 nfs4_unlock_state();
190e4fbf
N		 3963 if (status)
3964 printk("NFSD: Failure reading reboot recovery data\n");
3965}
3966
c2f1a551
MS		 3967/*
3968 * Since the lifetime of a delegation isn't limited to that of an open, a
3969 * client may quite reasonably hang on to a delegation as long as it has
3970 * the inode cached. This becomes an obvious problem the first time a
3971 * client's inode cache approaches the size of the server's total memory.
3972 *
3973 * For now we avoid this problem by imposing a hard limit on the number
3974 * of delegations, which varies according to the server's memory size.
3975 */
3976static void
3977set_max_delegations(void)
3978{
3979 /*
3980 * Allow at most 4 delegations per megabyte of RAM. Quick
3981 * estimates suggest that in the worst case (where every delegation
3982 * is for a different inode), a delegation could take about 1.5K,
3983 * giving a worst case usage of about 6% of memory.
3984 */
3985 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3986}
3987
ac4d8ff2
N		 3988/* initialization to perform when the nfsd service is started: */
3989
29ab23cc 3990static int
ac4d8ff2
N		 3991__nfs4_state_start(void)
3992{
b5a1a81e
BF		 3993 int ret;
3994
1da177e4 3995 boot_time = get_seconds();
af558e33 3996 locks_start_grace(&nfsd4_manager);
9a8db97e 3997 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
e46b498c 3998 nfsd4_grace);
b5a1a81e
BF		 3999 ret = set_callback_cred();
4000 if (ret)
4001 return -ENOMEM;
58da282b 4002 laundry_wq = create_singlethread_workqueue("nfsd4");
29ab23cc
BF		 4003 if (laundry_wq == NULL)
4004 return -ENOMEM;
b5a1a81e
BF		 4005 ret = nfsd4_create_callback_queue();
4006 if (ret)
4007 goto out_free_laundry;
e46b498c 4008 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
c2f1a551 4009 set_max_delegations();
b5a1a81e
BF		 4010 return 0;
4011out_free_laundry:
4012 destroy_workqueue(laundry_wq);
4013 return ret;
1da177e4
LT		 4014}
4015
29ab23cc 4016int
76a3550e 4017nfs4_state_start(void)
1da177e4 4018{
29ab23cc
BF		 4019 int ret;
4020
1da177e4 4021 if (nfs4_init)
29ab23cc 4022 return 0;
190e4fbf 4023 nfsd4_load_reboot_recovery_data();
29ab23cc
BF		 4024 ret = __nfs4_state_start();
4025 if (ret)
4026 return ret;
1da177e4 4027 nfs4_init = 1;
29ab23cc 4028 return 0;
1da177e4
LT		 4029}
4030
1da177e4
LT		 4031static void
4032__nfs4_state_shutdown(void)
4033{
4034 int i;
4035 struct nfs4_client *clp = NULL;
4036 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 4037 struct list_head *pos, *next, reaplist;
4038
1da177e4
LT		 4039 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4040 while (!list_empty(&conf_id_hashtbl[i])) {
4041 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4042 expire_client(clp);
4043 }
4044 while (!list_empty(&unconf_str_hashtbl[i])) {
4045 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4046 expire_client(clp);
4047 }
4048 }
4049 INIT_LIST_HEAD(&reaplist);
4050 spin_lock(&recall_lock);
4051 list_for_each_safe(pos, next, &del_recall_lru) {
4052 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4053 list_move(&dp->dl_recall_lru, &reaplist);
4054 }
4055 spin_unlock(&recall_lock);
4056 list_for_each_safe(pos, next, &reaplist) {
4057 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4058 list_del_init(&dp->dl_recall_lru);
4059 unhash_delegation(dp);
4060 }
4061
190e4fbf 4062 nfsd4_shutdown_recdir();
1da177e4 4063 nfs4_init = 0;
1da177e4
LT		 4064}
4065
4066void
4067nfs4_state_shutdown(void)
4068{
5e8d5c29
N		 4069 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4070 destroy_workqueue(laundry_wq);
2c5e7615 4071 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 4072 nfs4_lock_state();
4073 nfs4_release_reclaim();
4074 __nfs4_state_shutdown();
b5a1a81e 4075 nfsd4_destroy_callback_queue();
1da177e4
LT		 4076 nfs4_unlock_state();
4077}
4078
3dd98a3b
JL		 4079/*
4080 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4081 * accessed when nfsd is starting.
4082 */
0964a3d3
N		 4083static void
4084nfs4_set_recdir(char *recdir)
4085{
0964a3d3 4086 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 4087}
4088
4089/*
4090 * Change the NFSv4 recovery directory to recdir.
4091 */
4092int
4093nfs4_reset_recoverydir(char *recdir)
4094{
4095 int status;
a63bb996 4096 struct path path;
0964a3d3 4097
a63bb996 4098 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 4099 if (status)
4100 return status;
4101 status = -ENOTDIR;
a63bb996 4102 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 4103 nfs4_set_recdir(recdir);
4104 status = 0;
4105 }
a63bb996 4106 path_put(&path);
0964a3d3
N		 4107 return status;
4108}
4109
3dd98a3b
JL		 4110char *
4111nfs4_recoverydir(void)
4112{
4113 return user_recovery_dirname;
4114}
Linux 6.x block layer and io_uring tree(s)