2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
35 #include <linux/file.h>
36 #include <linux/smp_lock.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/sunrpc/svcauth_gss.h>
41 #include <linux/sunrpc/clnt.h>
45 #define NFSDDBG_FACILITY NFSDDBG_PROC
48 time_t nfsd4_lease
= 90; /* default lease time */
49 time_t nfsd4_grace
= 90;
50 static time_t boot_time
;
51 static u32 current_ownerid
= 1;
52 static u32 current_fileid
= 1;
53 static u32 current_delegid
= 1;
54 static stateid_t zerostateid
; /* bits all 0 */
55 static stateid_t onestateid
; /* bits all 1 */
56 static u64 current_sessionid
= 1;
58 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
59 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
61 /* forward declarations */
62 static struct nfs4_stateid
* find_stateid(stateid_t
*stid
, int flags
);
63 static struct nfs4_delegation
* find_delegation_stateid(struct inode
*ino
, stateid_t
*stid
);
64 static char user_recovery_dirname
[PATH_MAX
] = "/var/lib/nfs/v4recovery";
65 static void nfs4_set_recdir(char *recdir
);
69 /* Currently used for almost all code touching nfsv4 state: */
70 static DEFINE_MUTEX(client_mutex
);
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:
77 static DEFINE_SPINLOCK(recall_lock
);
79 static struct kmem_cache
*stateowner_slab
= NULL
;
80 static struct kmem_cache
*file_slab
= NULL
;
81 static struct kmem_cache
*stateid_slab
= NULL
;
82 static struct kmem_cache
*deleg_slab
= NULL
;
87 mutex_lock(&client_mutex
);
91 nfs4_unlock_state(void)
93 mutex_unlock(&client_mutex
);
97 opaque_hashval(const void *ptr
, int nbytes
)
99 unsigned char *cptr
= (unsigned char *) ptr
;
109 static struct list_head del_recall_lru
;
112 put_nfs4_file(struct nfs4_file
*fi
)
114 if (atomic_dec_and_lock(&fi
->fi_ref
, &recall_lock
)) {
115 list_del(&fi
->fi_hash
);
116 spin_unlock(&recall_lock
);
118 kmem_cache_free(file_slab
, fi
);
123 get_nfs4_file(struct nfs4_file
*fi
)
125 atomic_inc(&fi
->fi_ref
);
128 static int num_delegations
;
129 unsigned int max_delegations
;
132 * Open owner state (share locks)
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)
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)
145 static struct list_head ownerid_hashtbl
[OWNER_HASH_SIZE
];
146 static struct list_head ownerstr_hashtbl
[OWNER_HASH_SIZE
];
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)
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)
162 static struct list_head file_hashtbl
[FILE_HASH_SIZE
];
163 static struct list_head stateid_hashtbl
[STATEID_HASH_SIZE
];
165 static struct nfs4_delegation
*
166 alloc_init_deleg(struct nfs4_client
*clp
, struct nfs4_stateid
*stp
, struct svc_fh
*current_fh
, u32 type
)
168 struct nfs4_delegation
*dp
;
169 struct nfs4_file
*fp
= stp
->st_file
;
170 struct nfs4_cb_conn
*cb
= &stp
->st_stateowner
->so_client
->cl_cb_conn
;
172 dprintk("NFSD alloc_init_deleg\n");
174 * Major work on the lease subsystem (for example, to support
175 * calbacks on stat) will be required before we can support
176 * write delegations properly.
178 if (type
!= NFS4_OPEN_DELEGATE_READ
)
180 if (fp
->fi_had_conflict
)
182 if (num_delegations
> max_delegations
)
184 dp
= kmem_cache_alloc(deleg_slab
, GFP_KERNEL
);
188 INIT_LIST_HEAD(&dp
->dl_perfile
);
189 INIT_LIST_HEAD(&dp
->dl_perclnt
);
190 INIT_LIST_HEAD(&dp
->dl_recall_lru
);
195 get_file(stp
->st_vfs_file
);
196 dp
->dl_vfs_file
= stp
->st_vfs_file
;
198 dp
->dl_ident
= cb
->cb_ident
;
199 dp
->dl_stateid
.si_boot
= boot_time
;
200 dp
->dl_stateid
.si_stateownerid
= current_delegid
++;
201 dp
->dl_stateid
.si_fileid
= 0;
202 dp
->dl_stateid
.si_generation
= 0;
203 fh_copy_shallow(&dp
->dl_fh
, ¤t_fh
->fh_handle
);
205 atomic_set(&dp
->dl_count
, 1);
206 list_add(&dp
->dl_perfile
, &fp
->fi_delegations
);
207 list_add(&dp
->dl_perclnt
, &clp
->cl_delegations
);
208 INIT_WORK(&dp
->dl_recall
.cb_work
, nfsd4_do_callback_rpc
);
213 nfs4_put_delegation(struct nfs4_delegation
*dp
)
215 if (atomic_dec_and_test(&dp
->dl_count
)) {
216 dprintk("NFSD: freeing dp %p\n",dp
);
217 put_nfs4_file(dp
->dl_file
);
218 kmem_cache_free(deleg_slab
, dp
);
223 /* Remove the associated file_lock first, then remove the delegation.
224 * lease_modify() is called to remove the FS_LEASE file_lock from
225 * the i_flock list, eventually calling nfsd's lock_manager
226 * fl_release_callback.
229 nfs4_close_delegation(struct nfs4_delegation
*dp
)
231 struct file
*filp
= dp
->dl_vfs_file
;
233 dprintk("NFSD: close_delegation dp %p\n",dp
);
234 dp
->dl_vfs_file
= NULL
;
235 /* The following nfsd_close may not actually close the file,
236 * but we want to remove the lease in any case. */
238 vfs_setlease(filp
, F_UNLCK
, &dp
->dl_flock
);
242 /* Called under the state lock. */
244 unhash_delegation(struct nfs4_delegation
*dp
)
246 list_del_init(&dp
->dl_perfile
);
247 list_del_init(&dp
->dl_perclnt
);
248 spin_lock(&recall_lock
);
249 list_del_init(&dp
->dl_recall_lru
);
250 spin_unlock(&recall_lock
);
251 nfs4_close_delegation(dp
);
252 nfs4_put_delegation(dp
);
259 /* client_lock protects the client lru list and session hash table */
260 static DEFINE_SPINLOCK(client_lock
);
262 /* Hash tables for nfs4_clientid state */
263 #define CLIENT_HASH_BITS 4
264 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
265 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
267 #define clientid_hashval(id) \
268 ((id) & CLIENT_HASH_MASK)
269 #define clientstr_hashval(name) \
270 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
272 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
273 * used in reboot/reset lease grace period processing
275 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
276 * setclientid_confirmed info.
278 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
281 * client_lru holds client queue ordered by nfs4_client.cl_time
284 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
285 * for last close replay.
287 static struct list_head reclaim_str_hashtbl
[CLIENT_HASH_SIZE
];
288 static int reclaim_str_hashtbl_size
= 0;
289 static struct list_head conf_id_hashtbl
[CLIENT_HASH_SIZE
];
290 static struct list_head conf_str_hashtbl
[CLIENT_HASH_SIZE
];
291 static struct list_head unconf_str_hashtbl
[CLIENT_HASH_SIZE
];
292 static struct list_head unconf_id_hashtbl
[CLIENT_HASH_SIZE
];
293 static struct list_head client_lru
;
294 static struct list_head close_lru
;
296 static void unhash_generic_stateid(struct nfs4_stateid
*stp
)
298 list_del(&stp
->st_hash
);
299 list_del(&stp
->st_perfile
);
300 list_del(&stp
->st_perstateowner
);
303 static void free_generic_stateid(struct nfs4_stateid
*stp
)
305 put_nfs4_file(stp
->st_file
);
306 kmem_cache_free(stateid_slab
, stp
);
309 static void release_lock_stateid(struct nfs4_stateid
*stp
)
311 unhash_generic_stateid(stp
);
312 locks_remove_posix(stp
->st_vfs_file
, (fl_owner_t
)stp
->st_stateowner
);
313 free_generic_stateid(stp
);
316 static void unhash_lockowner(struct nfs4_stateowner
*sop
)
318 struct nfs4_stateid
*stp
;
320 list_del(&sop
->so_idhash
);
321 list_del(&sop
->so_strhash
);
322 list_del(&sop
->so_perstateid
);
323 while (!list_empty(&sop
->so_stateids
)) {
324 stp
= list_first_entry(&sop
->so_stateids
,
325 struct nfs4_stateid
, st_perstateowner
);
326 release_lock_stateid(stp
);
330 static void release_lockowner(struct nfs4_stateowner
*sop
)
332 unhash_lockowner(sop
);
333 nfs4_put_stateowner(sop
);
337 release_stateid_lockowners(struct nfs4_stateid
*open_stp
)
339 struct nfs4_stateowner
*lock_sop
;
341 while (!list_empty(&open_stp
->st_lockowners
)) {
342 lock_sop
= list_entry(open_stp
->st_lockowners
.next
,
343 struct nfs4_stateowner
, so_perstateid
);
344 /* list_del(&open_stp->st_lockowners); */
345 BUG_ON(lock_sop
->so_is_open_owner
);
346 release_lockowner(lock_sop
);
350 static void release_open_stateid(struct nfs4_stateid
*stp
)
352 unhash_generic_stateid(stp
);
353 release_stateid_lockowners(stp
);
354 nfsd_close(stp
->st_vfs_file
);
355 free_generic_stateid(stp
);
358 static void unhash_openowner(struct nfs4_stateowner
*sop
)
360 struct nfs4_stateid
*stp
;
362 list_del(&sop
->so_idhash
);
363 list_del(&sop
->so_strhash
);
364 list_del(&sop
->so_perclient
);
365 list_del(&sop
->so_perstateid
); /* XXX: necessary? */
366 while (!list_empty(&sop
->so_stateids
)) {
367 stp
= list_first_entry(&sop
->so_stateids
,
368 struct nfs4_stateid
, st_perstateowner
);
369 release_open_stateid(stp
);
373 static void release_openowner(struct nfs4_stateowner
*sop
)
375 unhash_openowner(sop
);
376 list_del(&sop
->so_close_lru
);
377 nfs4_put_stateowner(sop
);
380 #define SESSION_HASH_SIZE 512
381 static struct list_head sessionid_hashtbl
[SESSION_HASH_SIZE
];
384 hash_sessionid(struct nfs4_sessionid
*sessionid
)
386 struct nfsd4_sessionid
*sid
= (struct nfsd4_sessionid
*)sessionid
;
388 return sid
->sequence
% SESSION_HASH_SIZE
;
392 dump_sessionid(const char *fn
, struct nfs4_sessionid
*sessionid
)
394 u32
*ptr
= (u32
*)(&sessionid
->data
[0]);
395 dprintk("%s: %u:%u:%u:%u\n", fn
, ptr
[0], ptr
[1], ptr
[2], ptr
[3]);
399 gen_sessionid(struct nfsd4_session
*ses
)
401 struct nfs4_client
*clp
= ses
->se_client
;
402 struct nfsd4_sessionid
*sid
;
404 sid
= (struct nfsd4_sessionid
*)ses
->se_sessionid
.data
;
405 sid
->clientid
= clp
->cl_clientid
;
406 sid
->sequence
= current_sessionid
++;
411 * The protocol defines ca_maxresponssize_cached to include the size of
412 * the rpc header, but all we need to cache is the data starting after
413 * the end of the initial SEQUENCE operation--the rest we regenerate
414 * each time. Therefore we can advertise a ca_maxresponssize_cached
415 * value that is the number of bytes in our cache plus a few additional
416 * bytes. In order to stay on the safe side, and not promise more than
417 * we can cache, those additional bytes must be the minimum possible: 24
418 * bytes of rpc header (xid through accept state, with AUTH_NULL
419 * verifier), 12 for the compound header (with zero-length tag), and 44
420 * for the SEQUENCE op response:
422 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
425 * Give the client the number of ca_maxresponsesize_cached slots it
426 * requests, of size bounded by NFSD_SLOT_CACHE_SIZE,
427 * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more
428 * than NFSD_MAX_SLOTS_PER_SESSION.
430 * If we run out of reserved DRC memory we should (up to a point)
431 * re-negotiate active sessions and reduce their slot usage to make
432 * rooom for new connections. For now we just fail the create session.
434 static int set_forechannel_drc_size(struct nfsd4_channel_attrs
*fchan
)
436 int mem
, size
= fchan
->maxresp_cached
;
438 if (fchan
->maxreqs
< 1)
441 if (size
< NFSD_MIN_HDR_SEQ_SZ
)
442 size
= NFSD_MIN_HDR_SEQ_SZ
;
443 size
-= NFSD_MIN_HDR_SEQ_SZ
;
444 if (size
> NFSD_SLOT_CACHE_SIZE
)
445 size
= NFSD_SLOT_CACHE_SIZE
;
447 /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */
448 mem
= fchan
->maxreqs
* size
;
449 if (mem
> NFSD_MAX_MEM_PER_SESSION
) {
450 fchan
->maxreqs
= NFSD_MAX_MEM_PER_SESSION
/ size
;
451 if (fchan
->maxreqs
> NFSD_MAX_SLOTS_PER_SESSION
)
452 fchan
->maxreqs
= NFSD_MAX_SLOTS_PER_SESSION
;
453 mem
= fchan
->maxreqs
* size
;
456 spin_lock(&nfsd_drc_lock
);
457 /* bound the total session drc memory ussage */
458 if (mem
+ nfsd_drc_mem_used
> nfsd_drc_max_mem
) {
459 fchan
->maxreqs
= (nfsd_drc_max_mem
- nfsd_drc_mem_used
) / size
;
460 mem
= fchan
->maxreqs
* size
;
462 nfsd_drc_mem_used
+= mem
;
463 spin_unlock(&nfsd_drc_lock
);
465 if (fchan
->maxreqs
== 0)
466 return nfserr_jukebox
;
468 fchan
->maxresp_cached
= size
+ NFSD_MIN_HDR_SEQ_SZ
;
473 * fchan holds the client values on input, and the server values on output
474 * sv_max_mesg is the maximum payload plus one page for overhead.
476 static int init_forechannel_attrs(struct svc_rqst
*rqstp
,
477 struct nfsd4_channel_attrs
*session_fchan
,
478 struct nfsd4_channel_attrs
*fchan
)
481 __u32 maxcount
= nfsd_serv
->sv_max_mesg
;
483 /* headerpadsz set to zero in encode routine */
485 /* Use the client's max request and max response size if possible */
486 if (fchan
->maxreq_sz
> maxcount
)
487 fchan
->maxreq_sz
= maxcount
;
488 session_fchan
->maxreq_sz
= fchan
->maxreq_sz
;
490 if (fchan
->maxresp_sz
> maxcount
)
491 fchan
->maxresp_sz
= maxcount
;
492 session_fchan
->maxresp_sz
= fchan
->maxresp_sz
;
494 /* Use the client's maxops if possible */
495 if (fchan
->maxops
> NFSD_MAX_OPS_PER_COMPOUND
)
496 fchan
->maxops
= NFSD_MAX_OPS_PER_COMPOUND
;
497 session_fchan
->maxops
= fchan
->maxops
;
499 /* FIXME: Error means no more DRC pages so the server should
500 * recover pages from existing sessions. For now fail session
503 status
= set_forechannel_drc_size(fchan
);
505 session_fchan
->maxresp_cached
= fchan
->maxresp_cached
;
506 session_fchan
->maxreqs
= fchan
->maxreqs
;
508 dprintk("%s status %d\n", __func__
, status
);
513 free_session_slots(struct nfsd4_session
*ses
)
517 for (i
= 0; i
< ses
->se_fchannel
.maxreqs
; i
++)
518 kfree(ses
->se_slots
[i
]);
522 * We don't actually need to cache the rpc and session headers, so we
523 * can allocate a little less for each slot:
525 static inline int slot_bytes(struct nfsd4_channel_attrs
*ca
)
527 return ca
->maxresp_cached
- NFSD_MIN_HDR_SEQ_SZ
;
531 alloc_init_session(struct svc_rqst
*rqstp
, struct nfs4_client
*clp
,
532 struct nfsd4_create_session
*cses
)
534 struct nfsd4_session
*new, tmp
;
535 struct nfsd4_slot
*sp
;
536 int idx
, slotsize
, cachesize
, i
;
539 memset(&tmp
, 0, sizeof(tmp
));
541 /* FIXME: For now, we just accept the client back channel attributes. */
542 tmp
.se_bchannel
= cses
->back_channel
;
543 status
= init_forechannel_attrs(rqstp
, &tmp
.se_fchannel
,
544 &cses
->fore_channel
);
548 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION
* sizeof(struct nfsd4_slot
)
549 + sizeof(struct nfsd4_session
) > PAGE_SIZE
);
551 status
= nfserr_jukebox
;
552 /* allocate struct nfsd4_session and slot table pointers in one piece */
553 slotsize
= tmp
.se_fchannel
.maxreqs
* sizeof(struct nfsd4_slot
*);
554 new = kzalloc(sizeof(*new) + slotsize
, GFP_KERNEL
);
558 memcpy(new, &tmp
, sizeof(*new));
560 /* allocate each struct nfsd4_slot and data cache in one piece */
561 cachesize
= slot_bytes(&new->se_fchannel
);
562 for (i
= 0; i
< new->se_fchannel
.maxreqs
; i
++) {
563 sp
= kzalloc(sizeof(*sp
) + cachesize
, GFP_KERNEL
);
566 new->se_slots
[i
] = sp
;
569 new->se_client
= clp
;
571 idx
= hash_sessionid(&new->se_sessionid
);
572 memcpy(clp
->cl_sessionid
.data
, new->se_sessionid
.data
,
573 NFS4_MAX_SESSIONID_LEN
);
575 new->se_flags
= cses
->flags
;
576 kref_init(&new->se_ref
);
577 spin_lock(&client_lock
);
578 list_add(&new->se_hash
, &sessionid_hashtbl
[idx
]);
579 list_add(&new->se_perclnt
, &clp
->cl_sessions
);
580 spin_unlock(&client_lock
);
586 free_session_slots(new);
591 /* caller must hold client_lock */
592 static struct nfsd4_session
*
593 find_in_sessionid_hashtbl(struct nfs4_sessionid
*sessionid
)
595 struct nfsd4_session
*elem
;
598 dump_sessionid(__func__
, sessionid
);
599 idx
= hash_sessionid(sessionid
);
600 /* Search in the appropriate list */
601 list_for_each_entry(elem
, &sessionid_hashtbl
[idx
], se_hash
) {
602 if (!memcmp(elem
->se_sessionid
.data
, sessionid
->data
,
603 NFS4_MAX_SESSIONID_LEN
)) {
608 dprintk("%s: session not found\n", __func__
);
612 /* caller must hold client_lock */
614 unhash_session(struct nfsd4_session
*ses
)
616 list_del(&ses
->se_hash
);
617 list_del(&ses
->se_perclnt
);
621 free_session(struct kref
*kref
)
623 struct nfsd4_session
*ses
;
626 ses
= container_of(kref
, struct nfsd4_session
, se_ref
);
627 spin_lock(&nfsd_drc_lock
);
628 mem
= ses
->se_fchannel
.maxreqs
* slot_bytes(&ses
->se_fchannel
);
629 nfsd_drc_mem_used
-= mem
;
630 spin_unlock(&nfsd_drc_lock
);
631 free_session_slots(ses
);
635 /* must be called under the client_lock */
637 renew_client_locked(struct nfs4_client
*clp
)
639 if (is_client_expired(clp
)) {
640 dprintk("%s: client (clientid %08x/%08x) already expired\n",
642 clp
->cl_clientid
.cl_boot
,
643 clp
->cl_clientid
.cl_id
);
648 * Move client to the end to the LRU list.
650 dprintk("renewing client (clientid %08x/%08x)\n",
651 clp
->cl_clientid
.cl_boot
,
652 clp
->cl_clientid
.cl_id
);
653 list_move_tail(&clp
->cl_lru
, &client_lru
);
654 clp
->cl_time
= get_seconds();
658 renew_client(struct nfs4_client
*clp
)
660 spin_lock(&client_lock
);
661 renew_client_locked(clp
);
662 spin_unlock(&client_lock
);
665 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
667 STALE_CLIENTID(clientid_t
*clid
)
669 if (clid
->cl_boot
== boot_time
)
671 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
672 clid
->cl_boot
, clid
->cl_id
, boot_time
);
677 * XXX Should we use a slab cache ?
678 * This type of memory management is somewhat inefficient, but we use it
679 * anyway since SETCLIENTID is not a common operation.
681 static struct nfs4_client
*alloc_client(struct xdr_netobj name
)
683 struct nfs4_client
*clp
;
685 clp
= kzalloc(sizeof(struct nfs4_client
), GFP_KERNEL
);
688 clp
->cl_name
.data
= kmalloc(name
.len
, GFP_KERNEL
);
689 if (clp
->cl_name
.data
== NULL
) {
693 memcpy(clp
->cl_name
.data
, name
.data
, name
.len
);
694 clp
->cl_name
.len
= name
.len
;
699 free_client(struct nfs4_client
*clp
)
701 if (clp
->cl_cred
.cr_group_info
)
702 put_group_info(clp
->cl_cred
.cr_group_info
);
703 kfree(clp
->cl_principal
);
704 kfree(clp
->cl_name
.data
);
709 release_session_client(struct nfsd4_session
*session
)
711 struct nfs4_client
*clp
= session
->se_client
;
713 if (!atomic_dec_and_lock(&clp
->cl_refcount
, &client_lock
))
715 if (is_client_expired(clp
)) {
717 session
->se_client
= NULL
;
719 renew_client_locked(clp
);
720 spin_unlock(&client_lock
);
723 /* must be called under the client_lock */
725 unhash_client_locked(struct nfs4_client
*clp
)
727 mark_client_expired(clp
);
728 list_del(&clp
->cl_lru
);
729 while (!list_empty(&clp
->cl_sessions
)) {
730 struct nfsd4_session
*ses
;
731 ses
= list_entry(clp
->cl_sessions
.next
, struct nfsd4_session
,
734 nfsd4_put_session(ses
);
739 expire_client(struct nfs4_client
*clp
)
741 struct nfs4_stateowner
*sop
;
742 struct nfs4_delegation
*dp
;
743 struct list_head reaplist
;
745 INIT_LIST_HEAD(&reaplist
);
746 spin_lock(&recall_lock
);
747 while (!list_empty(&clp
->cl_delegations
)) {
748 dp
= list_entry(clp
->cl_delegations
.next
, struct nfs4_delegation
, dl_perclnt
);
749 dprintk("NFSD: expire client. dp %p, fp %p\n", dp
,
751 list_del_init(&dp
->dl_perclnt
);
752 list_move(&dp
->dl_recall_lru
, &reaplist
);
754 spin_unlock(&recall_lock
);
755 while (!list_empty(&reaplist
)) {
756 dp
= list_entry(reaplist
.next
, struct nfs4_delegation
, dl_recall_lru
);
757 list_del_init(&dp
->dl_recall_lru
);
758 unhash_delegation(dp
);
760 while (!list_empty(&clp
->cl_openowners
)) {
761 sop
= list_entry(clp
->cl_openowners
.next
, struct nfs4_stateowner
, so_perclient
);
762 release_openowner(sop
);
764 nfsd4_set_callback_client(clp
, NULL
);
765 if (clp
->cl_cb_conn
.cb_xprt
)
766 svc_xprt_put(clp
->cl_cb_conn
.cb_xprt
);
767 list_del(&clp
->cl_idhash
);
768 list_del(&clp
->cl_strhash
);
769 spin_lock(&client_lock
);
770 unhash_client_locked(clp
);
771 if (atomic_read(&clp
->cl_refcount
) == 0)
773 spin_unlock(&client_lock
);
776 static void copy_verf(struct nfs4_client
*target
, nfs4_verifier
*source
)
778 memcpy(target
->cl_verifier
.data
, source
->data
,
779 sizeof(target
->cl_verifier
.data
));
782 static void copy_clid(struct nfs4_client
*target
, struct nfs4_client
*source
)
784 target
->cl_clientid
.cl_boot
= source
->cl_clientid
.cl_boot
;
785 target
->cl_clientid
.cl_id
= source
->cl_clientid
.cl_id
;
788 static void copy_cred(struct svc_cred
*target
, struct svc_cred
*source
)
790 target
->cr_uid
= source
->cr_uid
;
791 target
->cr_gid
= source
->cr_gid
;
792 target
->cr_group_info
= source
->cr_group_info
;
793 get_group_info(target
->cr_group_info
);
796 static int same_name(const char *n1
, const char *n2
)
798 return 0 == memcmp(n1
, n2
, HEXDIR_LEN
);
802 same_verf(nfs4_verifier
*v1
, nfs4_verifier
*v2
)
804 return 0 == memcmp(v1
->data
, v2
->data
, sizeof(v1
->data
));
808 same_clid(clientid_t
*cl1
, clientid_t
*cl2
)
810 return (cl1
->cl_boot
== cl2
->cl_boot
) && (cl1
->cl_id
== cl2
->cl_id
);
813 /* XXX what about NGROUP */
815 same_creds(struct svc_cred
*cr1
, struct svc_cred
*cr2
)
817 return cr1
->cr_uid
== cr2
->cr_uid
;
820 static void gen_clid(struct nfs4_client
*clp
)
822 static u32 current_clientid
= 1;
824 clp
->cl_clientid
.cl_boot
= boot_time
;
825 clp
->cl_clientid
.cl_id
= current_clientid
++;
828 static void gen_confirm(struct nfs4_client
*clp
)
833 p
= (u32
*)clp
->cl_confirm
.data
;
834 *p
++ = get_seconds();
838 static struct nfs4_client
*create_client(struct xdr_netobj name
, char *recdir
,
839 struct svc_rqst
*rqstp
, nfs4_verifier
*verf
)
841 struct nfs4_client
*clp
;
842 struct sockaddr
*sa
= svc_addr(rqstp
);
845 clp
= alloc_client(name
);
849 princ
= svc_gss_principal(rqstp
);
851 clp
->cl_principal
= kstrdup(princ
, GFP_KERNEL
);
852 if (clp
->cl_principal
== NULL
) {
858 memcpy(clp
->cl_recdir
, recdir
, HEXDIR_LEN
);
859 atomic_set(&clp
->cl_refcount
, 0);
860 atomic_set(&clp
->cl_cb_set
, 0);
861 INIT_LIST_HEAD(&clp
->cl_idhash
);
862 INIT_LIST_HEAD(&clp
->cl_strhash
);
863 INIT_LIST_HEAD(&clp
->cl_openowners
);
864 INIT_LIST_HEAD(&clp
->cl_delegations
);
865 INIT_LIST_HEAD(&clp
->cl_sessions
);
866 INIT_LIST_HEAD(&clp
->cl_lru
);
867 clp
->cl_time
= get_seconds();
868 clear_bit(0, &clp
->cl_cb_slot_busy
);
869 rpc_init_wait_queue(&clp
->cl_cb_waitq
, "Backchannel slot table");
870 copy_verf(clp
, verf
);
871 rpc_copy_addr((struct sockaddr
*) &clp
->cl_addr
, sa
);
872 clp
->cl_flavor
= rqstp
->rq_flavor
;
873 copy_cred(&clp
->cl_cred
, &rqstp
->rq_cred
);
879 static int check_name(struct xdr_netobj name
)
883 if (name
.len
> NFS4_OPAQUE_LIMIT
) {
884 dprintk("NFSD: check_name: name too long(%d)!\n", name
.len
);
891 add_to_unconfirmed(struct nfs4_client
*clp
, unsigned int strhashval
)
893 unsigned int idhashval
;
895 list_add(&clp
->cl_strhash
, &unconf_str_hashtbl
[strhashval
]);
896 idhashval
= clientid_hashval(clp
->cl_clientid
.cl_id
);
897 list_add(&clp
->cl_idhash
, &unconf_id_hashtbl
[idhashval
]);
902 move_to_confirmed(struct nfs4_client
*clp
)
904 unsigned int idhashval
= clientid_hashval(clp
->cl_clientid
.cl_id
);
905 unsigned int strhashval
;
907 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp
);
908 list_move(&clp
->cl_idhash
, &conf_id_hashtbl
[idhashval
]);
909 strhashval
= clientstr_hashval(clp
->cl_recdir
);
910 list_move(&clp
->cl_strhash
, &conf_str_hashtbl
[strhashval
]);
914 static struct nfs4_client
*
915 find_confirmed_client(clientid_t
*clid
)
917 struct nfs4_client
*clp
;
918 unsigned int idhashval
= clientid_hashval(clid
->cl_id
);
920 list_for_each_entry(clp
, &conf_id_hashtbl
[idhashval
], cl_idhash
) {
921 if (same_clid(&clp
->cl_clientid
, clid
))
927 static struct nfs4_client
*
928 find_unconfirmed_client(clientid_t
*clid
)
930 struct nfs4_client
*clp
;
931 unsigned int idhashval
= clientid_hashval(clid
->cl_id
);
933 list_for_each_entry(clp
, &unconf_id_hashtbl
[idhashval
], cl_idhash
) {
934 if (same_clid(&clp
->cl_clientid
, clid
))
941 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
942 * parameter. Matching is based on the fact the at least one of the
943 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
945 * FIXME: we need to unify the clientid namespaces for nfsv4.x
946 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
947 * and SET_CLIENTID{,_CONFIRM}
950 match_clientid_establishment(struct nfs4_client
*clp
, bool use_exchange_id
)
952 bool has_exchange_flags
= (clp
->cl_exchange_flags
!= 0);
953 return use_exchange_id
== has_exchange_flags
;
956 static struct nfs4_client
*
957 find_confirmed_client_by_str(const char *dname
, unsigned int hashval
,
958 bool use_exchange_id
)
960 struct nfs4_client
*clp
;
962 list_for_each_entry(clp
, &conf_str_hashtbl
[hashval
], cl_strhash
) {
963 if (same_name(clp
->cl_recdir
, dname
) &&
964 match_clientid_establishment(clp
, use_exchange_id
))
970 static struct nfs4_client
*
971 find_unconfirmed_client_by_str(const char *dname
, unsigned int hashval
,
972 bool use_exchange_id
)
974 struct nfs4_client
*clp
;
976 list_for_each_entry(clp
, &unconf_str_hashtbl
[hashval
], cl_strhash
) {
977 if (same_name(clp
->cl_recdir
, dname
) &&
978 match_clientid_establishment(clp
, use_exchange_id
))
985 gen_callback(struct nfs4_client
*clp
, struct nfsd4_setclientid
*se
, u32 scopeid
)
987 struct nfs4_cb_conn
*cb
= &clp
->cl_cb_conn
;
988 unsigned short expected_family
;
990 /* Currently, we only support tcp and tcp6 for the callback channel */
991 if (se
->se_callback_netid_len
== 3 &&
992 !memcmp(se
->se_callback_netid_val
, "tcp", 3))
993 expected_family
= AF_INET
;
994 else if (se
->se_callback_netid_len
== 4 &&
995 !memcmp(se
->se_callback_netid_val
, "tcp6", 4))
996 expected_family
= AF_INET6
;
1000 cb
->cb_addrlen
= rpc_uaddr2sockaddr(se
->se_callback_addr_val
,
1001 se
->se_callback_addr_len
,
1002 (struct sockaddr
*) &cb
->cb_addr
,
1003 sizeof(cb
->cb_addr
));
1005 if (!cb
->cb_addrlen
|| cb
->cb_addr
.ss_family
!= expected_family
)
1008 if (cb
->cb_addr
.ss_family
== AF_INET6
)
1009 ((struct sockaddr_in6
*) &cb
->cb_addr
)->sin6_scope_id
= scopeid
;
1011 cb
->cb_minorversion
= 0;
1012 cb
->cb_prog
= se
->se_callback_prog
;
1013 cb
->cb_ident
= se
->se_callback_ident
;
1016 cb
->cb_addr
.ss_family
= AF_UNSPEC
;
1018 dprintk(KERN_INFO
"NFSD: this client (clientid %08x/%08x) "
1019 "will not receive delegations\n",
1020 clp
->cl_clientid
.cl_boot
, clp
->cl_clientid
.cl_id
);
1026 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1029 nfsd4_store_cache_entry(struct nfsd4_compoundres
*resp
)
1031 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
1034 dprintk("--> %s slot %p\n", __func__
, slot
);
1036 slot
->sl_opcnt
= resp
->opcnt
;
1037 slot
->sl_status
= resp
->cstate
.status
;
1039 if (nfsd4_not_cached(resp
)) {
1040 slot
->sl_datalen
= 0;
1043 slot
->sl_datalen
= (char *)resp
->p
- (char *)resp
->cstate
.datap
;
1044 base
= (char *)resp
->cstate
.datap
-
1045 (char *)resp
->xbuf
->head
[0].iov_base
;
1046 if (read_bytes_from_xdr_buf(resp
->xbuf
, base
, slot
->sl_data
,
1048 WARN("%s: sessions DRC could not cache compound\n", __func__
);
1053 * Encode the replay sequence operation from the slot values.
1054 * If cachethis is FALSE encode the uncached rep error on the next
1055 * operation which sets resp->p and increments resp->opcnt for
1056 * nfs4svc_encode_compoundres.
1060 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs
*args
,
1061 struct nfsd4_compoundres
*resp
)
1063 struct nfsd4_op
*op
;
1064 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
1066 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__
,
1067 resp
->opcnt
, resp
->cstate
.slot
->sl_cachethis
);
1069 /* Encode the replayed sequence operation */
1070 op
= &args
->ops
[resp
->opcnt
- 1];
1071 nfsd4_encode_operation(resp
, op
);
1073 /* Return nfserr_retry_uncached_rep in next operation. */
1074 if (args
->opcnt
> 1 && slot
->sl_cachethis
== 0) {
1075 op
= &args
->ops
[resp
->opcnt
++];
1076 op
->status
= nfserr_retry_uncached_rep
;
1077 nfsd4_encode_operation(resp
, op
);
1083 * The sequence operation is not cached because we can use the slot and
1087 nfsd4_replay_cache_entry(struct nfsd4_compoundres
*resp
,
1088 struct nfsd4_sequence
*seq
)
1090 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
1093 dprintk("--> %s slot %p\n", __func__
, slot
);
1095 /* Either returns 0 or nfserr_retry_uncached */
1096 status
= nfsd4_enc_sequence_replay(resp
->rqstp
->rq_argp
, resp
);
1097 if (status
== nfserr_retry_uncached_rep
)
1100 /* The sequence operation has been encoded, cstate->datap set. */
1101 memcpy(resp
->cstate
.datap
, slot
->sl_data
, slot
->sl_datalen
);
1103 resp
->opcnt
= slot
->sl_opcnt
;
1104 resp
->p
= resp
->cstate
.datap
+ XDR_QUADLEN(slot
->sl_datalen
);
1105 status
= slot
->sl_status
;
1111 * Set the exchange_id flags returned by the server.
1114 nfsd4_set_ex_flags(struct nfs4_client
*new, struct nfsd4_exchange_id
*clid
)
1116 /* pNFS is not supported */
1117 new->cl_exchange_flags
|= EXCHGID4_FLAG_USE_NON_PNFS
;
1119 /* Referrals are supported, Migration is not. */
1120 new->cl_exchange_flags
|= EXCHGID4_FLAG_SUPP_MOVED_REFER
;
1122 /* set the wire flags to return to client. */
1123 clid
->flags
= new->cl_exchange_flags
;
1127 nfsd4_exchange_id(struct svc_rqst
*rqstp
,
1128 struct nfsd4_compound_state
*cstate
,
1129 struct nfsd4_exchange_id
*exid
)
1131 struct nfs4_client
*unconf
, *conf
, *new;
1133 unsigned int strhashval
;
1134 char dname
[HEXDIR_LEN
];
1135 char addr_str
[INET6_ADDRSTRLEN
];
1136 nfs4_verifier verf
= exid
->verifier
;
1137 struct sockaddr
*sa
= svc_addr(rqstp
);
1139 rpc_ntop(sa
, addr_str
, sizeof(addr_str
));
1140 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1141 "ip_addr=%s flags %x, spa_how %d\n",
1142 __func__
, rqstp
, exid
, exid
->clname
.len
, exid
->clname
.data
,
1143 addr_str
, exid
->flags
, exid
->spa_how
);
1145 if (!check_name(exid
->clname
) || (exid
->flags
& ~EXCHGID4_FLAG_MASK_A
))
1146 return nfserr_inval
;
1148 /* Currently only support SP4_NONE */
1149 switch (exid
->spa_how
) {
1153 return nfserr_encr_alg_unsupp
;
1155 BUG(); /* checked by xdr code */
1157 return nfserr_serverfault
; /* no excuse :-/ */
1160 status
= nfs4_make_rec_clidname(dname
, &exid
->clname
);
1165 strhashval
= clientstr_hashval(dname
);
1170 conf
= find_confirmed_client_by_str(dname
, strhashval
, true);
1172 if (!same_verf(&verf
, &conf
->cl_verifier
)) {
1173 /* 18.35.4 case 8 */
1174 if (exid
->flags
& EXCHGID4_FLAG_UPD_CONFIRMED_REC_A
) {
1175 status
= nfserr_not_same
;
1178 /* Client reboot: destroy old state */
1179 expire_client(conf
);
1182 if (!same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
)) {
1183 /* 18.35.4 case 9 */
1184 if (exid
->flags
& EXCHGID4_FLAG_UPD_CONFIRMED_REC_A
) {
1185 status
= nfserr_perm
;
1188 expire_client(conf
);
1192 * Set bit when the owner id and verifier map to an already
1193 * confirmed client id (18.35.3).
1195 exid
->flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
1198 * Falling into 18.35.4 case 2, possible router replay.
1199 * Leave confirmed record intact and return same result.
1201 copy_verf(conf
, &verf
);
1206 /* 18.35.4 case 7 */
1207 if (exid
->flags
& EXCHGID4_FLAG_UPD_CONFIRMED_REC_A
) {
1208 status
= nfserr_noent
;
1212 unconf
= find_unconfirmed_client_by_str(dname
, strhashval
, true);
1215 * Possible retry or client restart. Per 18.35.4 case 4,
1216 * a new unconfirmed record should be generated regardless
1217 * of whether any properties have changed.
1219 expire_client(unconf
);
1224 new = create_client(exid
->clname
, dname
, rqstp
, &verf
);
1226 status
= nfserr_jukebox
;
1231 add_to_unconfirmed(new, strhashval
);
1233 exid
->clientid
.cl_boot
= new->cl_clientid
.cl_boot
;
1234 exid
->clientid
.cl_id
= new->cl_clientid
.cl_id
;
1237 nfsd4_set_ex_flags(new, exid
);
1239 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1240 new->cl_cs_slot
.sl_seqid
, new->cl_exchange_flags
);
1244 nfs4_unlock_state();
1246 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status
));
1251 check_slot_seqid(u32 seqid
, u32 slot_seqid
, int slot_inuse
)
1253 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__
, seqid
,
1256 /* The slot is in use, and no response has been sent. */
1258 if (seqid
== slot_seqid
)
1259 return nfserr_jukebox
;
1261 return nfserr_seq_misordered
;
1264 if (likely(seqid
== slot_seqid
+ 1))
1267 if (seqid
== slot_seqid
)
1268 return nfserr_replay_cache
;
1270 if (seqid
== 1 && (slot_seqid
+ 1) == 0)
1272 /* Misordered replay or misordered new request */
1273 return nfserr_seq_misordered
;
1277 * Cache the create session result into the create session single DRC
1278 * slot cache by saving the xdr structure. sl_seqid has been set.
1279 * Do this for solo or embedded create session operations.
1282 nfsd4_cache_create_session(struct nfsd4_create_session
*cr_ses
,
1283 struct nfsd4_clid_slot
*slot
, int nfserr
)
1285 slot
->sl_status
= nfserr
;
1286 memcpy(&slot
->sl_cr_ses
, cr_ses
, sizeof(*cr_ses
));
1290 nfsd4_replay_create_session(struct nfsd4_create_session
*cr_ses
,
1291 struct nfsd4_clid_slot
*slot
)
1293 memcpy(cr_ses
, &slot
->sl_cr_ses
, sizeof(*cr_ses
));
1294 return slot
->sl_status
;
1298 nfsd4_create_session(struct svc_rqst
*rqstp
,
1299 struct nfsd4_compound_state
*cstate
,
1300 struct nfsd4_create_session
*cr_ses
)
1302 struct sockaddr
*sa
= svc_addr(rqstp
);
1303 struct nfs4_client
*conf
, *unconf
;
1304 struct nfsd4_clid_slot
*cs_slot
= NULL
;
1308 unconf
= find_unconfirmed_client(&cr_ses
->clientid
);
1309 conf
= find_confirmed_client(&cr_ses
->clientid
);
1312 cs_slot
= &conf
->cl_cs_slot
;
1313 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
1314 if (status
== nfserr_replay_cache
) {
1315 dprintk("Got a create_session replay! seqid= %d\n",
1317 /* Return the cached reply status */
1318 status
= nfsd4_replay_create_session(cr_ses
, cs_slot
);
1320 } else if (cr_ses
->seqid
!= cs_slot
->sl_seqid
+ 1) {
1321 status
= nfserr_seq_misordered
;
1322 dprintk("Sequence misordered!\n");
1323 dprintk("Expected seqid= %d but got seqid= %d\n",
1324 cs_slot
->sl_seqid
, cr_ses
->seqid
);
1327 cs_slot
->sl_seqid
++;
1328 } else if (unconf
) {
1329 if (!same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
) ||
1330 !rpc_cmp_addr(sa
, (struct sockaddr
*) &unconf
->cl_addr
)) {
1331 status
= nfserr_clid_inuse
;
1335 cs_slot
= &unconf
->cl_cs_slot
;
1336 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
1338 /* an unconfirmed replay returns misordered */
1339 status
= nfserr_seq_misordered
;
1343 cs_slot
->sl_seqid
++; /* from 0 to 1 */
1344 move_to_confirmed(unconf
);
1346 if (cr_ses
->flags
& SESSION4_BACK_CHAN
) {
1347 unconf
->cl_cb_conn
.cb_xprt
= rqstp
->rq_xprt
;
1348 svc_xprt_get(rqstp
->rq_xprt
);
1350 (struct sockaddr
*)&unconf
->cl_cb_conn
.cb_addr
,
1352 unconf
->cl_cb_conn
.cb_addrlen
= svc_addr_len(sa
);
1353 unconf
->cl_cb_conn
.cb_minorversion
=
1354 cstate
->minorversion
;
1355 unconf
->cl_cb_conn
.cb_prog
= cr_ses
->callback_prog
;
1356 unconf
->cl_cb_seq_nr
= 1;
1357 nfsd4_probe_callback(unconf
, &unconf
->cl_cb_conn
);
1361 status
= nfserr_stale_clientid
;
1366 * We do not support RDMA or persistent sessions
1368 cr_ses
->flags
&= ~SESSION4_PERSIST
;
1369 cr_ses
->flags
&= ~SESSION4_RDMA
;
1371 status
= alloc_init_session(rqstp
, conf
, cr_ses
);
1375 memcpy(cr_ses
->sessionid
.data
, conf
->cl_sessionid
.data
,
1376 NFS4_MAX_SESSIONID_LEN
);
1377 cr_ses
->seqid
= cs_slot
->sl_seqid
;
1380 /* cache solo and embedded create sessions under the state lock */
1381 nfsd4_cache_create_session(cr_ses
, cs_slot
, status
);
1383 nfs4_unlock_state();
1384 dprintk("%s returns %d\n", __func__
, ntohl(status
));
1388 static bool nfsd4_last_compound_op(struct svc_rqst
*rqstp
)
1390 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
1391 struct nfsd4_compoundargs
*argp
= rqstp
->rq_argp
;
1393 return argp
->opcnt
== resp
->opcnt
;
1396 static bool nfsd4_compound_in_session(struct nfsd4_session
*session
, struct nfs4_sessionid
*sid
)
1400 return !memcmp(sid
, &session
->se_sessionid
, sizeof(*sid
));
1404 nfsd4_destroy_session(struct svc_rqst
*r
,
1405 struct nfsd4_compound_state
*cstate
,
1406 struct nfsd4_destroy_session
*sessionid
)
1408 struct nfsd4_session
*ses
;
1409 u32 status
= nfserr_badsession
;
1412 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1413 * - Should we return nfserr_back_chan_busy if waiting for
1414 * callbacks on to-be-destroyed session?
1415 * - Do we need to clear any callback info from previous session?
1418 if (nfsd4_compound_in_session(cstate
->session
, &sessionid
->sessionid
)) {
1419 if (!nfsd4_last_compound_op(r
))
1420 return nfserr_not_only_op
;
1422 dump_sessionid(__func__
, &sessionid
->sessionid
);
1423 spin_lock(&client_lock
);
1424 ses
= find_in_sessionid_hashtbl(&sessionid
->sessionid
);
1426 spin_unlock(&client_lock
);
1430 unhash_session(ses
);
1431 spin_unlock(&client_lock
);
1434 /* wait for callbacks */
1435 nfsd4_set_callback_client(ses
->se_client
, NULL
);
1436 nfs4_unlock_state();
1437 nfsd4_put_session(ses
);
1440 dprintk("%s returns %d\n", __func__
, ntohl(status
));
1445 nfsd4_sequence(struct svc_rqst
*rqstp
,
1446 struct nfsd4_compound_state
*cstate
,
1447 struct nfsd4_sequence
*seq
)
1449 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
1450 struct nfsd4_session
*session
;
1451 struct nfsd4_slot
*slot
;
1454 if (resp
->opcnt
!= 1)
1455 return nfserr_sequence_pos
;
1457 spin_lock(&client_lock
);
1458 status
= nfserr_badsession
;
1459 session
= find_in_sessionid_hashtbl(&seq
->sessionid
);
1463 status
= nfserr_badslot
;
1464 if (seq
->slotid
>= session
->se_fchannel
.maxreqs
)
1467 slot
= session
->se_slots
[seq
->slotid
];
1468 dprintk("%s: slotid %d\n", __func__
, seq
->slotid
);
1470 /* We do not negotiate the number of slots yet, so set the
1471 * maxslots to the session maxreqs which is used to encode
1472 * sr_highest_slotid and the sr_target_slot id to maxslots */
1473 seq
->maxslots
= session
->se_fchannel
.maxreqs
;
1475 status
= check_slot_seqid(seq
->seqid
, slot
->sl_seqid
, slot
->sl_inuse
);
1476 if (status
== nfserr_replay_cache
) {
1477 cstate
->slot
= slot
;
1478 cstate
->session
= session
;
1479 /* Return the cached reply status and set cstate->status
1480 * for nfsd4_proc_compound processing */
1481 status
= nfsd4_replay_cache_entry(resp
, seq
);
1482 cstate
->status
= nfserr_replay_cache
;
1488 /* Success! bump slot seqid */
1489 slot
->sl_inuse
= true;
1490 slot
->sl_seqid
= seq
->seqid
;
1491 slot
->sl_cachethis
= seq
->cachethis
;
1493 cstate
->slot
= slot
;
1494 cstate
->session
= session
;
1497 /* Hold a session reference until done processing the compound. */
1498 if (cstate
->session
) {
1499 nfsd4_get_session(cstate
->session
);
1500 atomic_inc(&session
->se_client
->cl_refcount
);
1502 spin_unlock(&client_lock
);
1503 dprintk("%s: return %d\n", __func__
, ntohl(status
));
1508 nfsd4_reclaim_complete(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
, struct nfsd4_reclaim_complete
*rc
)
1510 if (rc
->rca_one_fs
) {
1511 if (!cstate
->current_fh
.fh_dentry
)
1512 return nfserr_nofilehandle
;
1514 * We don't take advantage of the rca_one_fs case.
1515 * That's OK, it's optional, we can safely ignore it.
1520 if (is_client_expired(cstate
->session
->se_client
)) {
1521 nfs4_unlock_state();
1523 * The following error isn't really legal.
1524 * But we only get here if the client just explicitly
1525 * destroyed the client. Surely it no longer cares what
1526 * error it gets back on an operation for the dead
1529 return nfserr_stale_clientid
;
1531 nfsd4_create_clid_dir(cstate
->session
->se_client
);
1532 nfs4_unlock_state();
1537 nfsd4_setclientid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
1538 struct nfsd4_setclientid
*setclid
)
1540 struct sockaddr
*sa
= svc_addr(rqstp
);
1541 struct xdr_netobj clname
= {
1542 .len
= setclid
->se_namelen
,
1543 .data
= setclid
->se_name
,
1545 nfs4_verifier clverifier
= setclid
->se_verf
;
1546 unsigned int strhashval
;
1547 struct nfs4_client
*conf
, *unconf
, *new;
1549 char dname
[HEXDIR_LEN
];
1551 if (!check_name(clname
))
1552 return nfserr_inval
;
1554 status
= nfs4_make_rec_clidname(dname
, &clname
);
1559 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1560 * We get here on a DRC miss.
1563 strhashval
= clientstr_hashval(dname
);
1566 conf
= find_confirmed_client_by_str(dname
, strhashval
, false);
1568 /* RFC 3530 14.2.33 CASE 0: */
1569 status
= nfserr_clid_inuse
;
1570 if (!same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
)) {
1571 char addr_str
[INET6_ADDRSTRLEN
];
1572 rpc_ntop((struct sockaddr
*) &conf
->cl_addr
, addr_str
,
1574 dprintk("NFSD: setclientid: string in use by client "
1575 "at %s\n", addr_str
);
1580 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1581 * has a description of SETCLIENTID request processing consisting
1582 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1584 unconf
= find_unconfirmed_client_by_str(dname
, strhashval
, false);
1585 status
= nfserr_resource
;
1588 * RFC 3530 14.2.33 CASE 4:
1589 * placed first, because it is the normal case
1592 expire_client(unconf
);
1593 new = create_client(clname
, dname
, rqstp
, &clverifier
);
1597 } else if (same_verf(&conf
->cl_verifier
, &clverifier
)) {
1599 * RFC 3530 14.2.33 CASE 1:
1600 * probable callback update
1603 /* Note this is removing unconfirmed {*x***},
1604 * which is stronger than RFC recommended {vxc**}.
1605 * This has the advantage that there is at most
1606 * one {*x***} in either list at any time.
1608 expire_client(unconf
);
1610 new = create_client(clname
, dname
, rqstp
, &clverifier
);
1613 copy_clid(new, conf
);
1614 } else if (!unconf
) {
1616 * RFC 3530 14.2.33 CASE 2:
1617 * probable client reboot; state will be removed if
1620 new = create_client(clname
, dname
, rqstp
, &clverifier
);
1626 * RFC 3530 14.2.33 CASE 3:
1627 * probable client reboot; state will be removed if
1630 expire_client(unconf
);
1631 new = create_client(clname
, dname
, rqstp
, &clverifier
);
1636 gen_callback(new, setclid
, rpc_get_scope_id(sa
));
1637 add_to_unconfirmed(new, strhashval
);
1638 setclid
->se_clientid
.cl_boot
= new->cl_clientid
.cl_boot
;
1639 setclid
->se_clientid
.cl_id
= new->cl_clientid
.cl_id
;
1640 memcpy(setclid
->se_confirm
.data
, new->cl_confirm
.data
, sizeof(setclid
->se_confirm
.data
));
1643 nfs4_unlock_state();
1649 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1650 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1651 * bullets, labeled as CASE1 - CASE4 below.
1654 nfsd4_setclientid_confirm(struct svc_rqst
*rqstp
,
1655 struct nfsd4_compound_state
*cstate
,
1656 struct nfsd4_setclientid_confirm
*setclientid_confirm
)
1658 struct sockaddr
*sa
= svc_addr(rqstp
);
1659 struct nfs4_client
*conf
, *unconf
;
1660 nfs4_verifier confirm
= setclientid_confirm
->sc_confirm
;
1661 clientid_t
* clid
= &setclientid_confirm
->sc_clientid
;
1664 if (STALE_CLIENTID(clid
))
1665 return nfserr_stale_clientid
;
1667 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1668 * We get here on a DRC miss.
1673 conf
= find_confirmed_client(clid
);
1674 unconf
= find_unconfirmed_client(clid
);
1676 status
= nfserr_clid_inuse
;
1677 if (conf
&& !rpc_cmp_addr((struct sockaddr
*) &conf
->cl_addr
, sa
))
1679 if (unconf
&& !rpc_cmp_addr((struct sockaddr
*) &unconf
->cl_addr
, sa
))
1683 * section 14.2.34 of RFC 3530 has a description of
1684 * SETCLIENTID_CONFIRM request processing consisting
1685 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1687 if (conf
&& unconf
&& same_verf(&confirm
, &unconf
->cl_confirm
)) {
1689 * RFC 3530 14.2.34 CASE 1:
1692 if (!same_creds(&conf
->cl_cred
, &unconf
->cl_cred
))
1693 status
= nfserr_clid_inuse
;
1695 atomic_set(&conf
->cl_cb_set
, 0);
1696 nfsd4_probe_callback(conf
, &unconf
->cl_cb_conn
);
1697 expire_client(unconf
);
1701 } else if (conf
&& !unconf
) {
1703 * RFC 3530 14.2.34 CASE 2:
1704 * probable retransmitted request; play it safe and
1707 if (!same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
))
1708 status
= nfserr_clid_inuse
;
1711 } else if (!conf
&& unconf
1712 && same_verf(&unconf
->cl_confirm
, &confirm
)) {
1714 * RFC 3530 14.2.34 CASE 3:
1715 * Normal case; new or rebooted client:
1717 if (!same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
)) {
1718 status
= nfserr_clid_inuse
;
1721 clientstr_hashval(unconf
->cl_recdir
);
1722 conf
= find_confirmed_client_by_str(unconf
->cl_recdir
,
1725 nfsd4_remove_clid_dir(conf
);
1726 expire_client(conf
);
1728 move_to_confirmed(unconf
);
1730 nfsd4_probe_callback(conf
, &conf
->cl_cb_conn
);
1733 } else if ((!conf
|| (conf
&& !same_verf(&conf
->cl_confirm
, &confirm
)))
1734 && (!unconf
|| (unconf
&& !same_verf(&unconf
->cl_confirm
,
1737 * RFC 3530 14.2.34 CASE 4:
1738 * Client probably hasn't noticed that we rebooted yet.
1740 status
= nfserr_stale_clientid
;
1742 /* check that we have hit one of the cases...*/
1743 status
= nfserr_clid_inuse
;
1746 nfs4_unlock_state();
1750 /* OPEN Share state helper functions */
1751 static inline struct nfs4_file
*
1752 alloc_init_file(struct inode
*ino
)
1754 struct nfs4_file
*fp
;
1755 unsigned int hashval
= file_hashval(ino
);
1757 fp
= kmem_cache_alloc(file_slab
, GFP_KERNEL
);
1759 atomic_set(&fp
->fi_ref
, 1);
1760 INIT_LIST_HEAD(&fp
->fi_hash
);
1761 INIT_LIST_HEAD(&fp
->fi_stateids
);
1762 INIT_LIST_HEAD(&fp
->fi_delegations
);
1763 fp
->fi_inode
= igrab(ino
);
1764 fp
->fi_id
= current_fileid
++;
1765 fp
->fi_had_conflict
= false;
1766 spin_lock(&recall_lock
);
1767 list_add(&fp
->fi_hash
, &file_hashtbl
[hashval
]);
1768 spin_unlock(&recall_lock
);
1775 nfsd4_free_slab(struct kmem_cache
**slab
)
1779 kmem_cache_destroy(*slab
);
1784 nfsd4_free_slabs(void)
1786 nfsd4_free_slab(&stateowner_slab
);
1787 nfsd4_free_slab(&file_slab
);
1788 nfsd4_free_slab(&stateid_slab
);
1789 nfsd4_free_slab(&deleg_slab
);
1793 nfsd4_init_slabs(void)
1795 stateowner_slab
= kmem_cache_create("nfsd4_stateowners",
1796 sizeof(struct nfs4_stateowner
), 0, 0, NULL
);
1797 if (stateowner_slab
== NULL
)
1799 file_slab
= kmem_cache_create("nfsd4_files",
1800 sizeof(struct nfs4_file
), 0, 0, NULL
);
1801 if (file_slab
== NULL
)
1803 stateid_slab
= kmem_cache_create("nfsd4_stateids",
1804 sizeof(struct nfs4_stateid
), 0, 0, NULL
);
1805 if (stateid_slab
== NULL
)
1807 deleg_slab
= kmem_cache_create("nfsd4_delegations",
1808 sizeof(struct nfs4_delegation
), 0, 0, NULL
);
1809 if (deleg_slab
== NULL
)
1814 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1819 nfs4_free_stateowner(struct kref
*kref
)
1821 struct nfs4_stateowner
*sop
=
1822 container_of(kref
, struct nfs4_stateowner
, so_ref
);
1823 kfree(sop
->so_owner
.data
);
1824 kmem_cache_free(stateowner_slab
, sop
);
1827 static inline struct nfs4_stateowner
*
1828 alloc_stateowner(struct xdr_netobj
*owner
)
1830 struct nfs4_stateowner
*sop
;
1832 if ((sop
= kmem_cache_alloc(stateowner_slab
, GFP_KERNEL
))) {
1833 if ((sop
->so_owner
.data
= kmalloc(owner
->len
, GFP_KERNEL
))) {
1834 memcpy(sop
->so_owner
.data
, owner
->data
, owner
->len
);
1835 sop
->so_owner
.len
= owner
->len
;
1836 kref_init(&sop
->so_ref
);
1839 kmem_cache_free(stateowner_slab
, sop
);
1844 static struct nfs4_stateowner
*
1845 alloc_init_open_stateowner(unsigned int strhashval
, struct nfs4_client
*clp
, struct nfsd4_open
*open
) {
1846 struct nfs4_stateowner
*sop
;
1847 struct nfs4_replay
*rp
;
1848 unsigned int idhashval
;
1850 if (!(sop
= alloc_stateowner(&open
->op_owner
)))
1852 idhashval
= ownerid_hashval(current_ownerid
);
1853 INIT_LIST_HEAD(&sop
->so_idhash
);
1854 INIT_LIST_HEAD(&sop
->so_strhash
);
1855 INIT_LIST_HEAD(&sop
->so_perclient
);
1856 INIT_LIST_HEAD(&sop
->so_stateids
);
1857 INIT_LIST_HEAD(&sop
->so_perstateid
); /* not used */
1858 INIT_LIST_HEAD(&sop
->so_close_lru
);
1860 list_add(&sop
->so_idhash
, &ownerid_hashtbl
[idhashval
]);
1861 list_add(&sop
->so_strhash
, &ownerstr_hashtbl
[strhashval
]);
1862 list_add(&sop
->so_perclient
, &clp
->cl_openowners
);
1863 sop
->so_is_open_owner
= 1;
1864 sop
->so_id
= current_ownerid
++;
1865 sop
->so_client
= clp
;
1866 sop
->so_seqid
= open
->op_seqid
;
1867 sop
->so_confirmed
= 0;
1868 rp
= &sop
->so_replay
;
1869 rp
->rp_status
= nfserr_serverfault
;
1871 rp
->rp_buf
= rp
->rp_ibuf
;
1876 init_stateid(struct nfs4_stateid
*stp
, struct nfs4_file
*fp
, struct nfsd4_open
*open
) {
1877 struct nfs4_stateowner
*sop
= open
->op_stateowner
;
1878 unsigned int hashval
= stateid_hashval(sop
->so_id
, fp
->fi_id
);
1880 INIT_LIST_HEAD(&stp
->st_hash
);
1881 INIT_LIST_HEAD(&stp
->st_perstateowner
);
1882 INIT_LIST_HEAD(&stp
->st_lockowners
);
1883 INIT_LIST_HEAD(&stp
->st_perfile
);
1884 list_add(&stp
->st_hash
, &stateid_hashtbl
[hashval
]);
1885 list_add(&stp
->st_perstateowner
, &sop
->so_stateids
);
1886 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
1887 stp
->st_stateowner
= sop
;
1890 stp
->st_stateid
.si_boot
= boot_time
;
1891 stp
->st_stateid
.si_stateownerid
= sop
->so_id
;
1892 stp
->st_stateid
.si_fileid
= fp
->fi_id
;
1893 stp
->st_stateid
.si_generation
= 0;
1894 stp
->st_access_bmap
= 0;
1895 stp
->st_deny_bmap
= 0;
1896 __set_bit(open
->op_share_access
& ~NFS4_SHARE_WANT_MASK
,
1897 &stp
->st_access_bmap
);
1898 __set_bit(open
->op_share_deny
, &stp
->st_deny_bmap
);
1899 stp
->st_openstp
= NULL
;
1903 move_to_close_lru(struct nfs4_stateowner
*sop
)
1905 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop
);
1907 list_move_tail(&sop
->so_close_lru
, &close_lru
);
1908 sop
->so_time
= get_seconds();
1912 same_owner_str(struct nfs4_stateowner
*sop
, struct xdr_netobj
*owner
,
1915 return (sop
->so_owner
.len
== owner
->len
) &&
1916 0 == memcmp(sop
->so_owner
.data
, owner
->data
, owner
->len
) &&
1917 (sop
->so_client
->cl_clientid
.cl_id
== clid
->cl_id
);
1920 static struct nfs4_stateowner
*
1921 find_openstateowner_str(unsigned int hashval
, struct nfsd4_open
*open
)
1923 struct nfs4_stateowner
*so
= NULL
;
1925 list_for_each_entry(so
, &ownerstr_hashtbl
[hashval
], so_strhash
) {
1926 if (same_owner_str(so
, &open
->op_owner
, &open
->op_clientid
))
1932 /* search file_hashtbl[] for file */
1933 static struct nfs4_file
*
1934 find_file(struct inode
*ino
)
1936 unsigned int hashval
= file_hashval(ino
);
1937 struct nfs4_file
*fp
;
1939 spin_lock(&recall_lock
);
1940 list_for_each_entry(fp
, &file_hashtbl
[hashval
], fi_hash
) {
1941 if (fp
->fi_inode
== ino
) {
1943 spin_unlock(&recall_lock
);
1947 spin_unlock(&recall_lock
);
1951 static inline int access_valid(u32 x
, u32 minorversion
)
1953 if ((x
& NFS4_SHARE_ACCESS_MASK
) < NFS4_SHARE_ACCESS_READ
)
1955 if ((x
& NFS4_SHARE_ACCESS_MASK
) > NFS4_SHARE_ACCESS_BOTH
)
1957 x
&= ~NFS4_SHARE_ACCESS_MASK
;
1958 if (minorversion
&& x
) {
1959 if ((x
& NFS4_SHARE_WANT_MASK
) > NFS4_SHARE_WANT_CANCEL
)
1961 if ((x
& NFS4_SHARE_WHEN_MASK
) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED
)
1963 x
&= ~(NFS4_SHARE_WANT_MASK
| NFS4_SHARE_WHEN_MASK
);
1970 static inline int deny_valid(u32 x
)
1972 /* Note: unlike access bits, deny bits may be zero. */
1973 return x
<= NFS4_SHARE_DENY_BOTH
;
1977 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1978 * st_{access,deny}_bmap field of the stateid, in order to track not
1979 * only what share bits are currently in force, but also what
1980 * combinations of share bits previous opens have used. This allows us
1981 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1982 * return an error if the client attempt to downgrade to a combination
1983 * of share bits not explicable by closing some of its previous opens.
1985 * XXX: This enforcement is actually incomplete, since we don't keep
1986 * track of access/deny bit combinations; so, e.g., we allow:
1988 * OPEN allow read, deny write
1989 * OPEN allow both, deny none
1990 * DOWNGRADE allow read, deny none
1992 * which we should reject.
1995 set_access(unsigned int *access
, unsigned long bmap
) {
1999 for (i
= 1; i
< 4; i
++) {
2000 if (test_bit(i
, &bmap
))
2006 set_deny(unsigned int *deny
, unsigned long bmap
) {
2010 for (i
= 0; i
< 4; i
++) {
2011 if (test_bit(i
, &bmap
))
2017 test_share(struct nfs4_stateid
*stp
, struct nfsd4_open
*open
) {
2018 unsigned int access
, deny
;
2020 set_access(&access
, stp
->st_access_bmap
);
2021 set_deny(&deny
, stp
->st_deny_bmap
);
2022 if ((access
& open
->op_share_deny
) || (deny
& open
->op_share_access
))
2028 * Called to check deny when READ with all zero stateid or
2029 * WRITE with all zero or all one stateid
2032 nfs4_share_conflict(struct svc_fh
*current_fh
, unsigned int deny_type
)
2034 struct inode
*ino
= current_fh
->fh_dentry
->d_inode
;
2035 struct nfs4_file
*fp
;
2036 struct nfs4_stateid
*stp
;
2039 dprintk("NFSD: nfs4_share_conflict\n");
2041 fp
= find_file(ino
);
2044 ret
= nfserr_locked
;
2045 /* Search for conflicting share reservations */
2046 list_for_each_entry(stp
, &fp
->fi_stateids
, st_perfile
) {
2047 if (test_bit(deny_type
, &stp
->st_deny_bmap
) ||
2048 test_bit(NFS4_SHARE_DENY_BOTH
, &stp
->st_deny_bmap
))
2058 nfs4_file_downgrade(struct file
*filp
, unsigned int share_access
)
2060 if (share_access
& NFS4_SHARE_ACCESS_WRITE
) {
2061 drop_file_write_access(filp
);
2062 spin_lock(&filp
->f_lock
);
2063 filp
->f_mode
= (filp
->f_mode
| FMODE_READ
) & ~FMODE_WRITE
;
2064 spin_unlock(&filp
->f_lock
);
2069 * Spawn a thread to perform a recall on the delegation represented
2070 * by the lease (file_lock)
2072 * Called from break_lease() with lock_kernel() held.
2073 * Note: we assume break_lease will only call this *once* for any given
2077 void nfsd_break_deleg_cb(struct file_lock
*fl
)
2079 struct nfs4_delegation
*dp
= (struct nfs4_delegation
*)fl
->fl_owner
;
2081 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp
,fl
);
2085 /* We're assuming the state code never drops its reference
2086 * without first removing the lease. Since we're in this lease
2087 * callback (and since the lease code is serialized by the kernel
2088 * lock) we know the server hasn't removed the lease yet, we know
2089 * it's safe to take a reference: */
2090 atomic_inc(&dp
->dl_count
);
2092 spin_lock(&recall_lock
);
2093 list_add_tail(&dp
->dl_recall_lru
, &del_recall_lru
);
2094 spin_unlock(&recall_lock
);
2096 /* only place dl_time is set. protected by lock_kernel*/
2097 dp
->dl_time
= get_seconds();
2100 * We don't want the locks code to timeout the lease for us;
2101 * we'll remove it ourself if the delegation isn't returned
2104 fl
->fl_break_time
= 0;
2106 dp
->dl_file
->fi_had_conflict
= true;
2107 nfsd4_cb_recall(dp
);
2111 * The file_lock is being reapd.
2113 * Called by locks_free_lock() with lock_kernel() held.
2116 void nfsd_release_deleg_cb(struct file_lock
*fl
)
2118 struct nfs4_delegation
*dp
= (struct nfs4_delegation
*)fl
->fl_owner
;
2120 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl
,dp
, atomic_read(&dp
->dl_count
));
2122 if (!(fl
->fl_flags
& FL_LEASE
) || !dp
)
2124 dp
->dl_flock
= NULL
;
2128 * Set the delegation file_lock back pointer.
2130 * Called from setlease() with lock_kernel() held.
2133 void nfsd_copy_lock_deleg_cb(struct file_lock
*new, struct file_lock
*fl
)
2135 struct nfs4_delegation
*dp
= (struct nfs4_delegation
*)new->fl_owner
;
2137 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp
);
2144 * Called from setlease() with lock_kernel() held
2147 int nfsd_same_client_deleg_cb(struct file_lock
*onlist
, struct file_lock
*try)
2149 struct nfs4_delegation
*onlistd
=
2150 (struct nfs4_delegation
*)onlist
->fl_owner
;
2151 struct nfs4_delegation
*tryd
=
2152 (struct nfs4_delegation
*)try->fl_owner
;
2154 if (onlist
->fl_lmops
!= try->fl_lmops
)
2157 return onlistd
->dl_client
== tryd
->dl_client
;
2162 int nfsd_change_deleg_cb(struct file_lock
**onlist
, int arg
)
2165 return lease_modify(onlist
, arg
);
2170 static const struct lock_manager_operations nfsd_lease_mng_ops
= {
2171 .fl_break
= nfsd_break_deleg_cb
,
2172 .fl_release_private
= nfsd_release_deleg_cb
,
2173 .fl_copy_lock
= nfsd_copy_lock_deleg_cb
,
2174 .fl_mylease
= nfsd_same_client_deleg_cb
,
2175 .fl_change
= nfsd_change_deleg_cb
,
2180 nfsd4_process_open1(struct nfsd4_compound_state
*cstate
,
2181 struct nfsd4_open
*open
)
2183 clientid_t
*clientid
= &open
->op_clientid
;
2184 struct nfs4_client
*clp
= NULL
;
2185 unsigned int strhashval
;
2186 struct nfs4_stateowner
*sop
= NULL
;
2188 if (!check_name(open
->op_owner
))
2189 return nfserr_inval
;
2191 if (STALE_CLIENTID(&open
->op_clientid
))
2192 return nfserr_stale_clientid
;
2194 strhashval
= ownerstr_hashval(clientid
->cl_id
, open
->op_owner
);
2195 sop
= find_openstateowner_str(strhashval
, open
);
2196 open
->op_stateowner
= sop
;
2198 /* Make sure the client's lease hasn't expired. */
2199 clp
= find_confirmed_client(clientid
);
2201 return nfserr_expired
;
2204 /* When sessions are used, skip open sequenceid processing */
2205 if (nfsd4_has_session(cstate
))
2207 if (!sop
->so_confirmed
) {
2208 /* Replace unconfirmed owners without checking for replay. */
2209 clp
= sop
->so_client
;
2210 release_openowner(sop
);
2211 open
->op_stateowner
= NULL
;
2214 if (open
->op_seqid
== sop
->so_seqid
- 1) {
2215 if (sop
->so_replay
.rp_buflen
)
2216 return nfserr_replay_me
;
2217 /* The original OPEN failed so spectacularly
2218 * that we don't even have replay data saved!
2219 * Therefore, we have no choice but to continue
2220 * processing this OPEN; presumably, we'll
2221 * fail again for the same reason.
2223 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2226 if (open
->op_seqid
!= sop
->so_seqid
)
2227 return nfserr_bad_seqid
;
2229 if (open
->op_stateowner
== NULL
) {
2230 sop
= alloc_init_open_stateowner(strhashval
, clp
, open
);
2232 return nfserr_resource
;
2233 open
->op_stateowner
= sop
;
2235 list_del_init(&sop
->so_close_lru
);
2236 renew_client(sop
->so_client
);
2240 static inline __be32
2241 nfs4_check_delegmode(struct nfs4_delegation
*dp
, int flags
)
2243 if ((flags
& WR_STATE
) && (dp
->dl_type
== NFS4_OPEN_DELEGATE_READ
))
2244 return nfserr_openmode
;
2249 static struct nfs4_delegation
*
2250 find_delegation_file(struct nfs4_file
*fp
, stateid_t
*stid
)
2252 struct nfs4_delegation
*dp
;
2254 list_for_each_entry(dp
, &fp
->fi_delegations
, dl_perfile
) {
2255 if (dp
->dl_stateid
.si_stateownerid
== stid
->si_stateownerid
)
2261 int share_access_to_flags(u32 share_access
)
2263 share_access
&= ~NFS4_SHARE_WANT_MASK
;
2265 return share_access
== NFS4_SHARE_ACCESS_READ
? RD_STATE
: WR_STATE
;
2269 nfs4_check_deleg(struct nfs4_file
*fp
, struct nfsd4_open
*open
,
2270 struct nfs4_delegation
**dp
)
2273 __be32 status
= nfserr_bad_stateid
;
2275 *dp
= find_delegation_file(fp
, &open
->op_delegate_stateid
);
2278 flags
= share_access_to_flags(open
->op_share_access
);
2279 status
= nfs4_check_delegmode(*dp
, flags
);
2283 if (open
->op_claim_type
!= NFS4_OPEN_CLAIM_DELEGATE_CUR
)
2287 open
->op_stateowner
->so_confirmed
= 1;
2292 nfs4_check_open(struct nfs4_file
*fp
, struct nfsd4_open
*open
, struct nfs4_stateid
**stpp
)
2294 struct nfs4_stateid
*local
;
2295 __be32 status
= nfserr_share_denied
;
2296 struct nfs4_stateowner
*sop
= open
->op_stateowner
;
2298 list_for_each_entry(local
, &fp
->fi_stateids
, st_perfile
) {
2299 /* ignore lock owners */
2300 if (local
->st_stateowner
->so_is_open_owner
== 0)
2302 /* remember if we have seen this open owner */
2303 if (local
->st_stateowner
== sop
)
2305 /* check for conflicting share reservations */
2306 if (!test_share(local
, open
))
2314 static inline struct nfs4_stateid
*
2315 nfs4_alloc_stateid(void)
2317 return kmem_cache_alloc(stateid_slab
, GFP_KERNEL
);
2320 static inline int nfs4_access_to_access(u32 nfs4_access
)
2324 if (nfs4_access
& NFS4_SHARE_ACCESS_READ
)
2325 flags
|= NFSD_MAY_READ
;
2326 if (nfs4_access
& NFS4_SHARE_ACCESS_WRITE
)
2327 flags
|= NFSD_MAY_WRITE
;
2332 nfs4_new_open(struct svc_rqst
*rqstp
, struct nfs4_stateid
**stpp
,
2333 struct nfs4_delegation
*dp
,
2334 struct svc_fh
*cur_fh
, struct nfsd4_open
*open
)
2336 struct nfs4_stateid
*stp
;
2338 stp
= nfs4_alloc_stateid();
2340 return nfserr_resource
;
2343 get_file(dp
->dl_vfs_file
);
2344 stp
->st_vfs_file
= dp
->dl_vfs_file
;
2347 int access
= nfs4_access_to_access(open
->op_share_access
);
2349 status
= nfsd_open(rqstp
, cur_fh
, S_IFREG
, access
,
2352 if (status
== nfserr_dropit
)
2353 status
= nfserr_jukebox
;
2354 kmem_cache_free(stateid_slab
, stp
);
2362 static inline __be32
2363 nfsd4_truncate(struct svc_rqst
*rqstp
, struct svc_fh
*fh
,
2364 struct nfsd4_open
*open
)
2366 struct iattr iattr
= {
2367 .ia_valid
= ATTR_SIZE
,
2370 if (!open
->op_truncate
)
2372 if (!(open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
))
2373 return nfserr_inval
;
2374 return nfsd_setattr(rqstp
, fh
, &iattr
, 0, (time_t)0);
2378 nfs4_upgrade_open(struct svc_rqst
*rqstp
, struct svc_fh
*cur_fh
, struct nfs4_stateid
*stp
, struct nfsd4_open
*open
)
2380 struct file
*filp
= stp
->st_vfs_file
;
2381 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
2382 unsigned int share_access
, new_writer
;
2383 u32 op_share_access
;
2386 set_access(&share_access
, stp
->st_access_bmap
);
2387 new_writer
= (~share_access
) & open
->op_share_access
2388 & NFS4_SHARE_ACCESS_WRITE
;
2391 int err
= get_write_access(inode
);
2393 return nfserrno(err
);
2394 err
= mnt_want_write(cur_fh
->fh_export
->ex_path
.mnt
);
2396 return nfserrno(err
);
2397 file_take_write(filp
);
2399 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
2402 put_write_access(inode
);
2405 /* remember the open */
2406 op_share_access
= open
->op_share_access
& ~NFS4_SHARE_WANT_MASK
;
2407 filp
->f_mode
|= op_share_access
;
2408 __set_bit(op_share_access
, &stp
->st_access_bmap
);
2409 __set_bit(open
->op_share_deny
, &stp
->st_deny_bmap
);
2416 nfs4_set_claim_prev(struct nfsd4_open
*open
)
2418 open
->op_stateowner
->so_confirmed
= 1;
2419 open
->op_stateowner
->so_client
->cl_firststate
= 1;
2423 * Attempt to hand out a delegation.
2426 nfs4_open_delegation(struct svc_fh
*fh
, struct nfsd4_open
*open
, struct nfs4_stateid
*stp
)
2428 struct nfs4_delegation
*dp
;
2429 struct nfs4_stateowner
*sop
= stp
->st_stateowner
;
2430 int cb_up
= atomic_read(&sop
->so_client
->cl_cb_set
);
2431 struct file_lock fl
, *flp
= &fl
;
2432 int status
, flag
= 0;
2434 flag
= NFS4_OPEN_DELEGATE_NONE
;
2435 open
->op_recall
= 0;
2436 switch (open
->op_claim_type
) {
2437 case NFS4_OPEN_CLAIM_PREVIOUS
:
2439 open
->op_recall
= 1;
2440 flag
= open
->op_delegate_type
;
2441 if (flag
== NFS4_OPEN_DELEGATE_NONE
)
2444 case NFS4_OPEN_CLAIM_NULL
:
2445 /* Let's not give out any delegations till everyone's
2446 * had the chance to reclaim theirs.... */
2447 if (locks_in_grace())
2449 if (!cb_up
|| !sop
->so_confirmed
)
2451 if (open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
)
2452 flag
= NFS4_OPEN_DELEGATE_WRITE
;
2454 flag
= NFS4_OPEN_DELEGATE_READ
;
2460 dp
= alloc_init_deleg(sop
->so_client
, stp
, fh
, flag
);
2462 flag
= NFS4_OPEN_DELEGATE_NONE
;
2465 locks_init_lock(&fl
);
2466 fl
.fl_lmops
= &nfsd_lease_mng_ops
;
2467 fl
.fl_flags
= FL_LEASE
;
2468 fl
.fl_type
= flag
== NFS4_OPEN_DELEGATE_READ
? F_RDLCK
: F_WRLCK
;
2469 fl
.fl_end
= OFFSET_MAX
;
2470 fl
.fl_owner
= (fl_owner_t
)dp
;
2471 fl
.fl_file
= stp
->st_vfs_file
;
2472 fl
.fl_pid
= current
->tgid
;
2474 /* vfs_setlease checks to see if delegation should be handed out.
2475 * the lock_manager callbacks fl_mylease and fl_change are used
2477 if ((status
= vfs_setlease(stp
->st_vfs_file
, fl
.fl_type
, &flp
))) {
2478 dprintk("NFSD: setlease failed [%d], no delegation\n", status
);
2479 unhash_delegation(dp
);
2480 flag
= NFS4_OPEN_DELEGATE_NONE
;
2484 memcpy(&open
->op_delegate_stateid
, &dp
->dl_stateid
, sizeof(dp
->dl_stateid
));
2486 dprintk("NFSD: delegation stateid=" STATEID_FMT
"\n",
2487 STATEID_VAL(&dp
->dl_stateid
));
2489 if (open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
2490 && flag
== NFS4_OPEN_DELEGATE_NONE
2491 && open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_NONE
)
2492 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2493 open
->op_delegate_type
= flag
;
2497 * called with nfs4_lock_state() held.
2500 nfsd4_process_open2(struct svc_rqst
*rqstp
, struct svc_fh
*current_fh
, struct nfsd4_open
*open
)
2502 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
2503 struct nfs4_file
*fp
= NULL
;
2504 struct inode
*ino
= current_fh
->fh_dentry
->d_inode
;
2505 struct nfs4_stateid
*stp
= NULL
;
2506 struct nfs4_delegation
*dp
= NULL
;
2509 status
= nfserr_inval
;
2510 if (!access_valid(open
->op_share_access
, resp
->cstate
.minorversion
)
2511 || !deny_valid(open
->op_share_deny
))
2514 * Lookup file; if found, lookup stateid and check open request,
2515 * and check for delegations in the process of being recalled.
2516 * If not found, create the nfs4_file struct
2518 fp
= find_file(ino
);
2520 if ((status
= nfs4_check_open(fp
, open
, &stp
)))
2522 status
= nfs4_check_deleg(fp
, open
, &dp
);
2526 status
= nfserr_bad_stateid
;
2527 if (open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEGATE_CUR
)
2529 status
= nfserr_resource
;
2530 fp
= alloc_init_file(ino
);
2536 * OPEN the file, or upgrade an existing OPEN.
2537 * If truncate fails, the OPEN fails.
2540 /* Stateid was found, this is an OPEN upgrade */
2541 status
= nfs4_upgrade_open(rqstp
, current_fh
, stp
, open
);
2544 update_stateid(&stp
->st_stateid
);
2546 /* Stateid was not found, this is a new OPEN */
2547 status
= nfs4_new_open(rqstp
, &stp
, dp
, current_fh
, open
);
2550 init_stateid(stp
, fp
, open
);
2551 status
= nfsd4_truncate(rqstp
, current_fh
, open
);
2553 release_open_stateid(stp
);
2556 if (nfsd4_has_session(&resp
->cstate
))
2557 update_stateid(&stp
->st_stateid
);
2559 memcpy(&open
->op_stateid
, &stp
->st_stateid
, sizeof(stateid_t
));
2561 if (nfsd4_has_session(&resp
->cstate
))
2562 open
->op_stateowner
->so_confirmed
= 1;
2565 * Attempt to hand out a delegation. No error return, because the
2566 * OPEN succeeds even if we fail.
2568 nfs4_open_delegation(current_fh
, open
, stp
);
2572 dprintk("%s: stateid=" STATEID_FMT
"\n", __func__
,
2573 STATEID_VAL(&stp
->st_stateid
));
2577 if (status
== 0 && open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
)
2578 nfs4_set_claim_prev(open
);
2580 * To finish the open response, we just need to set the rflags.
2582 open
->op_rflags
= NFS4_OPEN_RESULT_LOCKTYPE_POSIX
;
2583 if (!open
->op_stateowner
->so_confirmed
&&
2584 !nfsd4_has_session(&resp
->cstate
))
2585 open
->op_rflags
|= NFS4_OPEN_RESULT_CONFIRM
;
2591 nfsd4_renew(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
2594 struct nfs4_client
*clp
;
2598 dprintk("process_renew(%08x/%08x): starting\n",
2599 clid
->cl_boot
, clid
->cl_id
);
2600 status
= nfserr_stale_clientid
;
2601 if (STALE_CLIENTID(clid
))
2603 clp
= find_confirmed_client(clid
);
2604 status
= nfserr_expired
;
2606 /* We assume the client took too long to RENEW. */
2607 dprintk("nfsd4_renew: clientid not found!\n");
2611 status
= nfserr_cb_path_down
;
2612 if (!list_empty(&clp
->cl_delegations
)
2613 && !atomic_read(&clp
->cl_cb_set
))
2617 nfs4_unlock_state();
2621 struct lock_manager nfsd4_manager
= {
2625 nfsd4_end_grace(void)
2627 dprintk("NFSD: end of grace period\n");
2628 nfsd4_recdir_purge_old();
2629 locks_end_grace(&nfsd4_manager
);
2631 * Now that every NFSv4 client has had the chance to recover and
2632 * to see the (possibly new, possibly shorter) lease time, we
2633 * can safely set the next grace time to the current lease time:
2635 nfsd4_grace
= nfsd4_lease
;
2639 nfs4_laundromat(void)
2641 struct nfs4_client
*clp
;
2642 struct nfs4_stateowner
*sop
;
2643 struct nfs4_delegation
*dp
;
2644 struct list_head
*pos
, *next
, reaplist
;
2645 time_t cutoff
= get_seconds() - nfsd4_lease
;
2646 time_t t
, clientid_val
= nfsd4_lease
;
2647 time_t u
, test_val
= nfsd4_lease
;
2651 dprintk("NFSD: laundromat service - starting\n");
2652 if (locks_in_grace())
2654 INIT_LIST_HEAD(&reaplist
);
2655 spin_lock(&client_lock
);
2656 list_for_each_safe(pos
, next
, &client_lru
) {
2657 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
2658 if (time_after((unsigned long)clp
->cl_time
, (unsigned long)cutoff
)) {
2659 t
= clp
->cl_time
- cutoff
;
2660 if (clientid_val
> t
)
2664 if (atomic_read(&clp
->cl_refcount
)) {
2665 dprintk("NFSD: client in use (clientid %08x)\n",
2666 clp
->cl_clientid
.cl_id
);
2669 unhash_client_locked(clp
);
2670 list_add(&clp
->cl_lru
, &reaplist
);
2672 spin_unlock(&client_lock
);
2673 list_for_each_safe(pos
, next
, &reaplist
) {
2674 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
2675 dprintk("NFSD: purging unused client (clientid %08x)\n",
2676 clp
->cl_clientid
.cl_id
);
2677 nfsd4_remove_clid_dir(clp
);
2680 spin_lock(&recall_lock
);
2681 list_for_each_safe(pos
, next
, &del_recall_lru
) {
2682 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
2683 if (time_after((unsigned long)dp
->dl_time
, (unsigned long)cutoff
)) {
2684 u
= dp
->dl_time
- cutoff
;
2689 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2691 list_move(&dp
->dl_recall_lru
, &reaplist
);
2693 spin_unlock(&recall_lock
);
2694 list_for_each_safe(pos
, next
, &reaplist
) {
2695 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
2696 list_del_init(&dp
->dl_recall_lru
);
2697 unhash_delegation(dp
);
2699 test_val
= nfsd4_lease
;
2700 list_for_each_safe(pos
, next
, &close_lru
) {
2701 sop
= list_entry(pos
, struct nfs4_stateowner
, so_close_lru
);
2702 if (time_after((unsigned long)sop
->so_time
, (unsigned long)cutoff
)) {
2703 u
= sop
->so_time
- cutoff
;
2708 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2710 release_openowner(sop
);
2712 if (clientid_val
< NFSD_LAUNDROMAT_MINTIMEOUT
)
2713 clientid_val
= NFSD_LAUNDROMAT_MINTIMEOUT
;
2714 nfs4_unlock_state();
2715 return clientid_val
;
2718 static struct workqueue_struct
*laundry_wq
;
2719 static void laundromat_main(struct work_struct
*);
2720 static DECLARE_DELAYED_WORK(laundromat_work
, laundromat_main
);
2723 laundromat_main(struct work_struct
*not_used
)
2727 t
= nfs4_laundromat();
2728 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t
);
2729 queue_delayed_work(laundry_wq
, &laundromat_work
, t
*HZ
);
2732 static struct nfs4_stateowner
*
2733 search_close_lru(u32 st_id
, int flags
)
2735 struct nfs4_stateowner
*local
= NULL
;
2737 if (flags
& CLOSE_STATE
) {
2738 list_for_each_entry(local
, &close_lru
, so_close_lru
) {
2739 if (local
->so_id
== st_id
)
2747 nfs4_check_fh(struct svc_fh
*fhp
, struct nfs4_stateid
*stp
)
2749 return fhp
->fh_dentry
->d_inode
!= stp
->st_vfs_file
->f_path
.dentry
->d_inode
;
2753 STALE_STATEID(stateid_t
*stateid
)
2755 if (stateid
->si_boot
== boot_time
)
2757 dprintk("NFSD: stale stateid " STATEID_FMT
"!\n",
2758 STATEID_VAL(stateid
));
2763 access_permit_read(unsigned long access_bmap
)
2765 return test_bit(NFS4_SHARE_ACCESS_READ
, &access_bmap
) ||
2766 test_bit(NFS4_SHARE_ACCESS_BOTH
, &access_bmap
) ||
2767 test_bit(NFS4_SHARE_ACCESS_WRITE
, &access_bmap
);
2771 access_permit_write(unsigned long access_bmap
)
2773 return test_bit(NFS4_SHARE_ACCESS_WRITE
, &access_bmap
) ||
2774 test_bit(NFS4_SHARE_ACCESS_BOTH
, &access_bmap
);
2778 __be32
nfs4_check_openmode(struct nfs4_stateid
*stp
, int flags
)
2780 __be32 status
= nfserr_openmode
;
2782 if ((flags
& WR_STATE
) && (!access_permit_write(stp
->st_access_bmap
)))
2784 if ((flags
& RD_STATE
) && (!access_permit_read(stp
->st_access_bmap
)))
2791 static inline __be32
2792 check_special_stateids(svc_fh
*current_fh
, stateid_t
*stateid
, int flags
)
2794 if (ONE_STATEID(stateid
) && (flags
& RD_STATE
))
2796 else if (locks_in_grace()) {
2797 /* Answer in remaining cases depends on existance of
2798 * conflicting state; so we must wait out the grace period. */
2799 return nfserr_grace
;
2800 } else if (flags
& WR_STATE
)
2801 return nfs4_share_conflict(current_fh
,
2802 NFS4_SHARE_DENY_WRITE
);
2803 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2804 return nfs4_share_conflict(current_fh
,
2805 NFS4_SHARE_DENY_READ
);
2809 * Allow READ/WRITE during grace period on recovered state only for files
2810 * that are not able to provide mandatory locking.
2813 grace_disallows_io(struct inode
*inode
)
2815 return locks_in_grace() && mandatory_lock(inode
);
2818 static int check_stateid_generation(stateid_t
*in
, stateid_t
*ref
, int flags
)
2821 * When sessions are used the stateid generation number is ignored
2824 if ((flags
& HAS_SESSION
) && in
->si_generation
== 0)
2827 /* If the client sends us a stateid from the future, it's buggy: */
2828 if (in
->si_generation
> ref
->si_generation
)
2829 return nfserr_bad_stateid
;
2831 * The following, however, can happen. For example, if the
2832 * client sends an open and some IO at the same time, the open
2833 * may bump si_generation while the IO is still in flight.
2834 * Thanks to hard links and renames, the client never knows what
2835 * file an open will affect. So it could avoid that situation
2836 * only by serializing all opens and IO from the same open
2837 * owner. To recover from the old_stateid error, the client
2838 * will just have to retry the IO:
2840 if (in
->si_generation
< ref
->si_generation
)
2841 return nfserr_old_stateid
;
2846 static int is_delegation_stateid(stateid_t
*stateid
)
2848 return stateid
->si_fileid
== 0;
2852 * Checks for stateid operations
2855 nfs4_preprocess_stateid_op(struct nfsd4_compound_state
*cstate
,
2856 stateid_t
*stateid
, int flags
, struct file
**filpp
)
2858 struct nfs4_stateid
*stp
= NULL
;
2859 struct nfs4_delegation
*dp
= NULL
;
2860 struct svc_fh
*current_fh
= &cstate
->current_fh
;
2861 struct inode
*ino
= current_fh
->fh_dentry
->d_inode
;
2867 if (grace_disallows_io(ino
))
2868 return nfserr_grace
;
2870 if (nfsd4_has_session(cstate
))
2871 flags
|= HAS_SESSION
;
2873 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
))
2874 return check_special_stateids(current_fh
, stateid
, flags
);
2876 status
= nfserr_stale_stateid
;
2877 if (STALE_STATEID(stateid
))
2880 status
= nfserr_bad_stateid
;
2881 if (is_delegation_stateid(stateid
)) {
2882 dp
= find_delegation_stateid(ino
, stateid
);
2885 status
= check_stateid_generation(stateid
, &dp
->dl_stateid
,
2889 status
= nfs4_check_delegmode(dp
, flags
);
2892 renew_client(dp
->dl_client
);
2894 *filpp
= dp
->dl_vfs_file
;
2895 } else { /* open or lock stateid */
2896 stp
= find_stateid(stateid
, flags
);
2899 if (nfs4_check_fh(current_fh
, stp
))
2901 if (!stp
->st_stateowner
->so_confirmed
)
2903 status
= check_stateid_generation(stateid
, &stp
->st_stateid
,
2907 status
= nfs4_check_openmode(stp
, flags
);
2910 renew_client(stp
->st_stateowner
->so_client
);
2912 *filpp
= stp
->st_vfs_file
;
2922 return (type
== NFS4_READW_LT
|| type
== NFS4_READ_LT
) ?
2923 RD_STATE
: WR_STATE
;
2927 * Checks for sequence id mutating operations.
2930 nfs4_preprocess_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
2931 stateid_t
*stateid
, int flags
,
2932 struct nfs4_stateowner
**sopp
,
2933 struct nfs4_stateid
**stpp
, struct nfsd4_lock
*lock
)
2935 struct nfs4_stateid
*stp
;
2936 struct nfs4_stateowner
*sop
;
2937 struct svc_fh
*current_fh
= &cstate
->current_fh
;
2940 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT
"\n", __func__
,
2941 seqid
, STATEID_VAL(stateid
));
2946 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
)) {
2947 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2948 return nfserr_bad_stateid
;
2951 if (STALE_STATEID(stateid
))
2952 return nfserr_stale_stateid
;
2954 if (nfsd4_has_session(cstate
))
2955 flags
|= HAS_SESSION
;
2958 * We return BAD_STATEID if filehandle doesn't match stateid,
2959 * the confirmed flag is incorrecly set, or the generation
2960 * number is incorrect.
2962 stp
= find_stateid(stateid
, flags
);
2965 * Also, we should make sure this isn't just the result of
2968 sop
= search_close_lru(stateid
->si_stateownerid
, flags
);
2970 return nfserr_bad_stateid
;
2976 *sopp
= sop
= stp
->st_stateowner
;
2979 clientid_t
*lockclid
= &lock
->v
.new.clientid
;
2980 struct nfs4_client
*clp
= sop
->so_client
;
2984 lkflg
= setlkflg(lock
->lk_type
);
2986 if (lock
->lk_is_new
) {
2987 if (!sop
->so_is_open_owner
)
2988 return nfserr_bad_stateid
;
2989 if (!(flags
& HAS_SESSION
) &&
2990 !same_clid(&clp
->cl_clientid
, lockclid
))
2991 return nfserr_bad_stateid
;
2992 /* stp is the open stateid */
2993 status
= nfs4_check_openmode(stp
, lkflg
);
2997 /* stp is the lock stateid */
2998 status
= nfs4_check_openmode(stp
->st_openstp
, lkflg
);
3004 if (nfs4_check_fh(current_fh
, stp
)) {
3005 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3006 return nfserr_bad_stateid
;
3010 * We now validate the seqid and stateid generation numbers.
3011 * For the moment, we ignore the possibility of
3012 * generation number wraparound.
3014 if (!(flags
& HAS_SESSION
) && seqid
!= sop
->so_seqid
)
3017 if (sop
->so_confirmed
&& flags
& CONFIRM
) {
3018 dprintk("NFSD: preprocess_seqid_op: expected"
3019 " unconfirmed stateowner!\n");
3020 return nfserr_bad_stateid
;
3022 if (!sop
->so_confirmed
&& !(flags
& CONFIRM
)) {
3023 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3024 " confirmed yet!\n");
3025 return nfserr_bad_stateid
;
3027 status
= check_stateid_generation(stateid
, &stp
->st_stateid
, flags
);
3030 renew_client(sop
->so_client
);
3034 if (seqid
== sop
->so_seqid
- 1) {
3035 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
3036 /* indicate replay to calling function */
3037 return nfserr_replay_me
;
3039 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3040 sop
->so_seqid
, seqid
);
3042 return nfserr_bad_seqid
;
3046 nfsd4_open_confirm(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3047 struct nfsd4_open_confirm
*oc
)
3050 struct nfs4_stateowner
*sop
;
3051 struct nfs4_stateid
*stp
;
3053 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3054 (int)cstate
->current_fh
.fh_dentry
->d_name
.len
,
3055 cstate
->current_fh
.fh_dentry
->d_name
.name
);
3057 status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0);
3063 if ((status
= nfs4_preprocess_seqid_op(cstate
,
3064 oc
->oc_seqid
, &oc
->oc_req_stateid
,
3065 CONFIRM
| OPEN_STATE
,
3066 &oc
->oc_stateowner
, &stp
, NULL
)))
3069 sop
= oc
->oc_stateowner
;
3070 sop
->so_confirmed
= 1;
3071 update_stateid(&stp
->st_stateid
);
3072 memcpy(&oc
->oc_resp_stateid
, &stp
->st_stateid
, sizeof(stateid_t
));
3073 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT
"\n",
3074 __func__
, oc
->oc_seqid
, STATEID_VAL(&stp
->st_stateid
));
3076 nfsd4_create_clid_dir(sop
->so_client
);
3078 if (oc
->oc_stateowner
) {
3079 nfs4_get_stateowner(oc
->oc_stateowner
);
3080 cstate
->replay_owner
= oc
->oc_stateowner
;
3082 nfs4_unlock_state();
3088 * unset all bits in union bitmap (bmap) that
3089 * do not exist in share (from successful OPEN_DOWNGRADE)
3092 reset_union_bmap_access(unsigned long access
, unsigned long *bmap
)
3095 for (i
= 1; i
< 4; i
++) {
3096 if ((i
& access
) != i
)
3097 __clear_bit(i
, bmap
);
3102 reset_union_bmap_deny(unsigned long deny
, unsigned long *bmap
)
3105 for (i
= 0; i
< 4; i
++) {
3106 if ((i
& deny
) != i
)
3107 __clear_bit(i
, bmap
);
3112 nfsd4_open_downgrade(struct svc_rqst
*rqstp
,
3113 struct nfsd4_compound_state
*cstate
,
3114 struct nfsd4_open_downgrade
*od
)
3117 struct nfs4_stateid
*stp
;
3118 unsigned int share_access
;
3120 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3121 (int)cstate
->current_fh
.fh_dentry
->d_name
.len
,
3122 cstate
->current_fh
.fh_dentry
->d_name
.name
);
3124 if (!access_valid(od
->od_share_access
, cstate
->minorversion
)
3125 || !deny_valid(od
->od_share_deny
))
3126 return nfserr_inval
;
3129 if ((status
= nfs4_preprocess_seqid_op(cstate
,
3133 &od
->od_stateowner
, &stp
, NULL
)))
3136 status
= nfserr_inval
;
3137 if (!test_bit(od
->od_share_access
, &stp
->st_access_bmap
)) {
3138 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3139 stp
->st_access_bmap
, od
->od_share_access
);
3142 if (!test_bit(od
->od_share_deny
, &stp
->st_deny_bmap
)) {
3143 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3144 stp
->st_deny_bmap
, od
->od_share_deny
);
3147 set_access(&share_access
, stp
->st_access_bmap
);
3148 nfs4_file_downgrade(stp
->st_vfs_file
,
3149 share_access
& ~od
->od_share_access
);
3151 reset_union_bmap_access(od
->od_share_access
, &stp
->st_access_bmap
);
3152 reset_union_bmap_deny(od
->od_share_deny
, &stp
->st_deny_bmap
);
3154 update_stateid(&stp
->st_stateid
);
3155 memcpy(&od
->od_stateid
, &stp
->st_stateid
, sizeof(stateid_t
));
3158 if (od
->od_stateowner
) {
3159 nfs4_get_stateowner(od
->od_stateowner
);
3160 cstate
->replay_owner
= od
->od_stateowner
;
3162 nfs4_unlock_state();
3167 * nfs4_unlock_state() called after encode
3170 nfsd4_close(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3171 struct nfsd4_close
*close
)
3174 struct nfs4_stateid
*stp
;
3176 dprintk("NFSD: nfsd4_close on file %.*s\n",
3177 (int)cstate
->current_fh
.fh_dentry
->d_name
.len
,
3178 cstate
->current_fh
.fh_dentry
->d_name
.name
);
3181 /* check close_lru for replay */
3182 if ((status
= nfs4_preprocess_seqid_op(cstate
,
3185 OPEN_STATE
| CLOSE_STATE
,
3186 &close
->cl_stateowner
, &stp
, NULL
)))
3189 update_stateid(&stp
->st_stateid
);
3190 memcpy(&close
->cl_stateid
, &stp
->st_stateid
, sizeof(stateid_t
));
3192 /* release_stateid() calls nfsd_close() if needed */
3193 release_open_stateid(stp
);
3195 /* place unused nfs4_stateowners on so_close_lru list to be
3196 * released by the laundromat service after the lease period
3197 * to enable us to handle CLOSE replay
3199 if (list_empty(&close
->cl_stateowner
->so_stateids
))
3200 move_to_close_lru(close
->cl_stateowner
);
3202 if (close
->cl_stateowner
) {
3203 nfs4_get_stateowner(close
->cl_stateowner
);
3204 cstate
->replay_owner
= close
->cl_stateowner
;
3206 nfs4_unlock_state();
3211 nfsd4_delegreturn(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3212 struct nfsd4_delegreturn
*dr
)
3214 struct nfs4_delegation
*dp
;
3215 stateid_t
*stateid
= &dr
->dr_stateid
;
3216 struct inode
*inode
;
3220 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
3222 inode
= cstate
->current_fh
.fh_dentry
->d_inode
;
3224 if (nfsd4_has_session(cstate
))
3225 flags
|= HAS_SESSION
;
3227 status
= nfserr_bad_stateid
;
3228 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
))
3230 status
= nfserr_stale_stateid
;
3231 if (STALE_STATEID(stateid
))
3233 status
= nfserr_bad_stateid
;
3234 if (!is_delegation_stateid(stateid
))
3236 dp
= find_delegation_stateid(inode
, stateid
);
3239 status
= check_stateid_generation(stateid
, &dp
->dl_stateid
, flags
);
3242 renew_client(dp
->dl_client
);
3244 unhash_delegation(dp
);
3246 nfs4_unlock_state();
3253 * Lock owner state (byte-range locks)
3255 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3256 #define LOCK_HASH_BITS 8
3257 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3258 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3261 end_offset(u64 start
, u64 len
)
3266 return end
>= start
? end
: NFS4_MAX_UINT64
;
3269 /* last octet in a range */
3271 last_byte_offset(u64 start
, u64 len
)
3277 return end
> start
? end
- 1: NFS4_MAX_UINT64
;
3280 #define lockownerid_hashval(id) \
3281 ((id) & LOCK_HASH_MASK)
3283 static inline unsigned int
3284 lock_ownerstr_hashval(struct inode
*inode
, u32 cl_id
,
3285 struct xdr_netobj
*ownername
)
3287 return (file_hashval(inode
) + cl_id
3288 + opaque_hashval(ownername
->data
, ownername
->len
))
3292 static struct list_head lock_ownerid_hashtbl
[LOCK_HASH_SIZE
];
3293 static struct list_head lock_ownerstr_hashtbl
[LOCK_HASH_SIZE
];
3294 static struct list_head lockstateid_hashtbl
[STATEID_HASH_SIZE
];
3296 static struct nfs4_stateid
*
3297 find_stateid(stateid_t
*stid
, int flags
)
3299 struct nfs4_stateid
*local
;
3300 u32 st_id
= stid
->si_stateownerid
;
3301 u32 f_id
= stid
->si_fileid
;
3302 unsigned int hashval
;
3304 dprintk("NFSD: find_stateid flags 0x%x\n",flags
);
3305 if (flags
& (LOCK_STATE
| RD_STATE
| WR_STATE
)) {
3306 hashval
= stateid_hashval(st_id
, f_id
);
3307 list_for_each_entry(local
, &lockstateid_hashtbl
[hashval
], st_hash
) {
3308 if ((local
->st_stateid
.si_stateownerid
== st_id
) &&
3309 (local
->st_stateid
.si_fileid
== f_id
))
3314 if (flags
& (OPEN_STATE
| RD_STATE
| WR_STATE
)) {
3315 hashval
= stateid_hashval(st_id
, f_id
);
3316 list_for_each_entry(local
, &stateid_hashtbl
[hashval
], st_hash
) {
3317 if ((local
->st_stateid
.si_stateownerid
== st_id
) &&
3318 (local
->st_stateid
.si_fileid
== f_id
))
3325 static struct nfs4_delegation
*
3326 find_delegation_stateid(struct inode
*ino
, stateid_t
*stid
)
3328 struct nfs4_file
*fp
;
3329 struct nfs4_delegation
*dl
;
3331 dprintk("NFSD: %s: stateid=" STATEID_FMT
"\n", __func__
,
3334 fp
= find_file(ino
);
3337 dl
= find_delegation_file(fp
, stid
);
3343 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3344 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3345 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3346 * locking, this prevents us from being completely protocol-compliant. The
3347 * real solution to this problem is to start using unsigned file offsets in
3348 * the VFS, but this is a very deep change!
3351 nfs4_transform_lock_offset(struct file_lock
*lock
)
3353 if (lock
->fl_start
< 0)
3354 lock
->fl_start
= OFFSET_MAX
;
3355 if (lock
->fl_end
< 0)
3356 lock
->fl_end
= OFFSET_MAX
;
3359 /* Hack!: For now, we're defining this just so we can use a pointer to it
3360 * as a unique cookie to identify our (NFSv4's) posix locks. */
3361 static const struct lock_manager_operations nfsd_posix_mng_ops
= {
3365 nfs4_set_lock_denied(struct file_lock
*fl
, struct nfsd4_lock_denied
*deny
)
3367 struct nfs4_stateowner
*sop
;
3370 if (fl
->fl_lmops
== &nfsd_posix_mng_ops
) {
3371 sop
= (struct nfs4_stateowner
*) fl
->fl_owner
;
3372 hval
= lockownerid_hashval(sop
->so_id
);
3373 kref_get(&sop
->so_ref
);
3375 deny
->ld_clientid
= sop
->so_client
->cl_clientid
;
3377 deny
->ld_sop
= NULL
;
3378 deny
->ld_clientid
.cl_boot
= 0;
3379 deny
->ld_clientid
.cl_id
= 0;
3381 deny
->ld_start
= fl
->fl_start
;
3382 deny
->ld_length
= NFS4_MAX_UINT64
;
3383 if (fl
->fl_end
!= NFS4_MAX_UINT64
)
3384 deny
->ld_length
= fl
->fl_end
- fl
->fl_start
+ 1;
3385 deny
->ld_type
= NFS4_READ_LT
;
3386 if (fl
->fl_type
!= F_RDLCK
)
3387 deny
->ld_type
= NFS4_WRITE_LT
;
3390 static struct nfs4_stateowner
*
3391 find_lockstateowner_str(struct inode
*inode
, clientid_t
*clid
,
3392 struct xdr_netobj
*owner
)
3394 unsigned int hashval
= lock_ownerstr_hashval(inode
, clid
->cl_id
, owner
);
3395 struct nfs4_stateowner
*op
;
3397 list_for_each_entry(op
, &lock_ownerstr_hashtbl
[hashval
], so_strhash
) {
3398 if (same_owner_str(op
, owner
, clid
))
3405 * Alloc a lock owner structure.
3406 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3409 * strhashval = lock_ownerstr_hashval
3412 static struct nfs4_stateowner
*
3413 alloc_init_lock_stateowner(unsigned int strhashval
, struct nfs4_client
*clp
, struct nfs4_stateid
*open_stp
, struct nfsd4_lock
*lock
) {
3414 struct nfs4_stateowner
*sop
;
3415 struct nfs4_replay
*rp
;
3416 unsigned int idhashval
;
3418 if (!(sop
= alloc_stateowner(&lock
->lk_new_owner
)))
3420 idhashval
= lockownerid_hashval(current_ownerid
);
3421 INIT_LIST_HEAD(&sop
->so_idhash
);
3422 INIT_LIST_HEAD(&sop
->so_strhash
);
3423 INIT_LIST_HEAD(&sop
->so_perclient
);
3424 INIT_LIST_HEAD(&sop
->so_stateids
);
3425 INIT_LIST_HEAD(&sop
->so_perstateid
);
3426 INIT_LIST_HEAD(&sop
->so_close_lru
); /* not used */
3428 list_add(&sop
->so_idhash
, &lock_ownerid_hashtbl
[idhashval
]);
3429 list_add(&sop
->so_strhash
, &lock_ownerstr_hashtbl
[strhashval
]);
3430 list_add(&sop
->so_perstateid
, &open_stp
->st_lockowners
);
3431 sop
->so_is_open_owner
= 0;
3432 sop
->so_id
= current_ownerid
++;
3433 sop
->so_client
= clp
;
3434 /* It is the openowner seqid that will be incremented in encode in the
3435 * case of new lockowners; so increment the lock seqid manually: */
3436 sop
->so_seqid
= lock
->lk_new_lock_seqid
+ 1;
3437 sop
->so_confirmed
= 1;
3438 rp
= &sop
->so_replay
;
3439 rp
->rp_status
= nfserr_serverfault
;
3441 rp
->rp_buf
= rp
->rp_ibuf
;
3445 static struct nfs4_stateid
*
3446 alloc_init_lock_stateid(struct nfs4_stateowner
*sop
, struct nfs4_file
*fp
, struct nfs4_stateid
*open_stp
)
3448 struct nfs4_stateid
*stp
;
3449 unsigned int hashval
= stateid_hashval(sop
->so_id
, fp
->fi_id
);
3451 stp
= nfs4_alloc_stateid();
3454 INIT_LIST_HEAD(&stp
->st_hash
);
3455 INIT_LIST_HEAD(&stp
->st_perfile
);
3456 INIT_LIST_HEAD(&stp
->st_perstateowner
);
3457 INIT_LIST_HEAD(&stp
->st_lockowners
); /* not used */
3458 list_add(&stp
->st_hash
, &lockstateid_hashtbl
[hashval
]);
3459 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
3460 list_add(&stp
->st_perstateowner
, &sop
->so_stateids
);
3461 stp
->st_stateowner
= sop
;
3464 stp
->st_stateid
.si_boot
= boot_time
;
3465 stp
->st_stateid
.si_stateownerid
= sop
->so_id
;
3466 stp
->st_stateid
.si_fileid
= fp
->fi_id
;
3467 stp
->st_stateid
.si_generation
= 0;
3468 stp
->st_vfs_file
= open_stp
->st_vfs_file
; /* FIXME refcount?? */
3469 stp
->st_access_bmap
= open_stp
->st_access_bmap
;
3470 stp
->st_deny_bmap
= open_stp
->st_deny_bmap
;
3471 stp
->st_openstp
= open_stp
;
3478 check_lock_length(u64 offset
, u64 length
)
3480 return ((length
== 0) || ((length
!= NFS4_MAX_UINT64
) &&
3481 LOFF_OVERFLOW(offset
, length
)));
3488 nfsd4_lock(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3489 struct nfsd4_lock
*lock
)
3491 struct nfs4_stateowner
*open_sop
= NULL
;
3492 struct nfs4_stateowner
*lock_sop
= NULL
;
3493 struct nfs4_stateid
*lock_stp
;
3495 struct file_lock file_lock
;
3496 struct file_lock conflock
;
3498 unsigned int strhashval
;
3502 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3503 (long long) lock
->lk_offset
,
3504 (long long) lock
->lk_length
);
3506 if (check_lock_length(lock
->lk_offset
, lock
->lk_length
))
3507 return nfserr_inval
;
3509 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
,
3510 S_IFREG
, NFSD_MAY_LOCK
))) {
3511 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3517 if (lock
->lk_is_new
) {
3519 * Client indicates that this is a new lockowner.
3520 * Use open owner and open stateid to create lock owner and
3523 struct nfs4_stateid
*open_stp
= NULL
;
3524 struct nfs4_file
*fp
;
3526 status
= nfserr_stale_clientid
;
3527 if (!nfsd4_has_session(cstate
) &&
3528 STALE_CLIENTID(&lock
->lk_new_clientid
))
3531 /* validate and update open stateid and open seqid */
3532 status
= nfs4_preprocess_seqid_op(cstate
,
3533 lock
->lk_new_open_seqid
,
3534 &lock
->lk_new_open_stateid
,
3536 &lock
->lk_replay_owner
, &open_stp
,
3540 open_sop
= lock
->lk_replay_owner
;
3541 /* create lockowner and lock stateid */
3542 fp
= open_stp
->st_file
;
3543 strhashval
= lock_ownerstr_hashval(fp
->fi_inode
,
3544 open_sop
->so_client
->cl_clientid
.cl_id
,
3545 &lock
->v
.new.owner
);
3546 /* XXX: Do we need to check for duplicate stateowners on
3547 * the same file, or should they just be allowed (and
3548 * create new stateids)? */
3549 status
= nfserr_resource
;
3550 lock_sop
= alloc_init_lock_stateowner(strhashval
,
3551 open_sop
->so_client
, open_stp
, lock
);
3552 if (lock_sop
== NULL
)
3554 lock_stp
= alloc_init_lock_stateid(lock_sop
, fp
, open_stp
);
3555 if (lock_stp
== NULL
)
3558 /* lock (lock owner + lock stateid) already exists */
3559 status
= nfs4_preprocess_seqid_op(cstate
,
3560 lock
->lk_old_lock_seqid
,
3561 &lock
->lk_old_lock_stateid
,
3563 &lock
->lk_replay_owner
, &lock_stp
, lock
);
3566 lock_sop
= lock
->lk_replay_owner
;
3568 /* lock->lk_replay_owner and lock_stp have been created or found */
3569 filp
= lock_stp
->st_vfs_file
;
3571 status
= nfserr_grace
;
3572 if (locks_in_grace() && !lock
->lk_reclaim
)
3574 status
= nfserr_no_grace
;
3575 if (!locks_in_grace() && lock
->lk_reclaim
)
3578 locks_init_lock(&file_lock
);
3579 switch (lock
->lk_type
) {
3582 file_lock
.fl_type
= F_RDLCK
;
3586 case NFS4_WRITEW_LT
:
3587 file_lock
.fl_type
= F_WRLCK
;
3591 status
= nfserr_inval
;
3594 file_lock
.fl_owner
= (fl_owner_t
)lock_sop
;
3595 file_lock
.fl_pid
= current
->tgid
;
3596 file_lock
.fl_file
= filp
;
3597 file_lock
.fl_flags
= FL_POSIX
;
3598 file_lock
.fl_lmops
= &nfsd_posix_mng_ops
;
3600 file_lock
.fl_start
= lock
->lk_offset
;
3601 file_lock
.fl_end
= last_byte_offset(lock
->lk_offset
, lock
->lk_length
);
3602 nfs4_transform_lock_offset(&file_lock
);
3605 * Try to lock the file in the VFS.
3606 * Note: locks.c uses the BKL to protect the inode's lock list.
3609 err
= vfs_lock_file(filp
, cmd
, &file_lock
, &conflock
);
3611 case 0: /* success! */
3612 update_stateid(&lock_stp
->st_stateid
);
3613 memcpy(&lock
->lk_resp_stateid
, &lock_stp
->st_stateid
,
3617 case (EAGAIN
): /* conflock holds conflicting lock */
3618 status
= nfserr_denied
;
3619 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3620 nfs4_set_lock_denied(&conflock
, &lock
->lk_denied
);
3623 status
= nfserr_deadlock
;
3626 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err
);
3627 status
= nfserr_resource
;
3631 if (status
&& lock
->lk_is_new
&& lock_sop
)
3632 release_lockowner(lock_sop
);
3633 if (lock
->lk_replay_owner
) {
3634 nfs4_get_stateowner(lock
->lk_replay_owner
);
3635 cstate
->replay_owner
= lock
->lk_replay_owner
;
3637 nfs4_unlock_state();
3642 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3643 * so we do a temporary open here just to get an open file to pass to
3644 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3647 static int nfsd_test_lock(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file_lock
*lock
)
3652 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_READ
, &file
);
3655 err
= vfs_test_lock(file
, lock
);
3664 nfsd4_lockt(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3665 struct nfsd4_lockt
*lockt
)
3667 struct inode
*inode
;
3668 struct file_lock file_lock
;
3672 if (locks_in_grace())
3673 return nfserr_grace
;
3675 if (check_lock_length(lockt
->lt_offset
, lockt
->lt_length
))
3676 return nfserr_inval
;
3678 lockt
->lt_stateowner
= NULL
;
3681 status
= nfserr_stale_clientid
;
3682 if (!nfsd4_has_session(cstate
) && STALE_CLIENTID(&lockt
->lt_clientid
))
3685 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0))) {
3686 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
3687 if (status
== nfserr_symlink
)
3688 status
= nfserr_inval
;
3692 inode
= cstate
->current_fh
.fh_dentry
->d_inode
;
3693 locks_init_lock(&file_lock
);
3694 switch (lockt
->lt_type
) {
3697 file_lock
.fl_type
= F_RDLCK
;
3700 case NFS4_WRITEW_LT
:
3701 file_lock
.fl_type
= F_WRLCK
;
3704 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
3705 status
= nfserr_inval
;
3709 lockt
->lt_stateowner
= find_lockstateowner_str(inode
,
3710 &lockt
->lt_clientid
, &lockt
->lt_owner
);
3711 if (lockt
->lt_stateowner
)
3712 file_lock
.fl_owner
= (fl_owner_t
)lockt
->lt_stateowner
;
3713 file_lock
.fl_pid
= current
->tgid
;
3714 file_lock
.fl_flags
= FL_POSIX
;
3716 file_lock
.fl_start
= lockt
->lt_offset
;
3717 file_lock
.fl_end
= last_byte_offset(lockt
->lt_offset
, lockt
->lt_length
);
3719 nfs4_transform_lock_offset(&file_lock
);
3722 error
= nfsd_test_lock(rqstp
, &cstate
->current_fh
, &file_lock
);
3724 status
= nfserrno(error
);
3727 if (file_lock
.fl_type
!= F_UNLCK
) {
3728 status
= nfserr_denied
;
3729 nfs4_set_lock_denied(&file_lock
, &lockt
->lt_denied
);
3732 nfs4_unlock_state();
3737 nfsd4_locku(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3738 struct nfsd4_locku
*locku
)
3740 struct nfs4_stateid
*stp
;
3741 struct file
*filp
= NULL
;
3742 struct file_lock file_lock
;
3746 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3747 (long long) locku
->lu_offset
,
3748 (long long) locku
->lu_length
);
3750 if (check_lock_length(locku
->lu_offset
, locku
->lu_length
))
3751 return nfserr_inval
;
3755 if ((status
= nfs4_preprocess_seqid_op(cstate
,
3759 &locku
->lu_stateowner
, &stp
, NULL
)))
3762 filp
= stp
->st_vfs_file
;
3764 locks_init_lock(&file_lock
);
3765 file_lock
.fl_type
= F_UNLCK
;
3766 file_lock
.fl_owner
= (fl_owner_t
) locku
->lu_stateowner
;
3767 file_lock
.fl_pid
= current
->tgid
;
3768 file_lock
.fl_file
= filp
;
3769 file_lock
.fl_flags
= FL_POSIX
;
3770 file_lock
.fl_lmops
= &nfsd_posix_mng_ops
;
3771 file_lock
.fl_start
= locku
->lu_offset
;
3773 file_lock
.fl_end
= last_byte_offset(locku
->lu_offset
, locku
->lu_length
);
3774 nfs4_transform_lock_offset(&file_lock
);
3777 * Try to unlock the file in the VFS.
3779 err
= vfs_lock_file(filp
, F_SETLK
, &file_lock
, NULL
);
3781 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
3785 * OK, unlock succeeded; the only thing left to do is update the stateid.
3787 update_stateid(&stp
->st_stateid
);
3788 memcpy(&locku
->lu_stateid
, &stp
->st_stateid
, sizeof(stateid_t
));
3791 if (locku
->lu_stateowner
) {
3792 nfs4_get_stateowner(locku
->lu_stateowner
);
3793 cstate
->replay_owner
= locku
->lu_stateowner
;
3795 nfs4_unlock_state();
3799 status
= nfserrno(err
);
3805 * 1: locks held by lockowner
3806 * 0: no locks held by lockowner
3809 check_for_locks(struct file
*filp
, struct nfs4_stateowner
*lowner
)
3811 struct file_lock
**flpp
;
3812 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
3816 for (flpp
= &inode
->i_flock
; *flpp
!= NULL
; flpp
= &(*flpp
)->fl_next
) {
3817 if ((*flpp
)->fl_owner
== (fl_owner_t
)lowner
) {
3828 nfsd4_release_lockowner(struct svc_rqst
*rqstp
,
3829 struct nfsd4_compound_state
*cstate
,
3830 struct nfsd4_release_lockowner
*rlockowner
)
3832 clientid_t
*clid
= &rlockowner
->rl_clientid
;
3833 struct nfs4_stateowner
*sop
;
3834 struct nfs4_stateid
*stp
;
3835 struct xdr_netobj
*owner
= &rlockowner
->rl_owner
;
3836 struct list_head matches
;
3840 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3841 clid
->cl_boot
, clid
->cl_id
);
3843 /* XXX check for lease expiration */
3845 status
= nfserr_stale_clientid
;
3846 if (STALE_CLIENTID(clid
))
3851 status
= nfserr_locks_held
;
3852 /* XXX: we're doing a linear search through all the lockowners.
3853 * Yipes! For now we'll just hope clients aren't really using
3854 * release_lockowner much, but eventually we have to fix these
3855 * data structures. */
3856 INIT_LIST_HEAD(&matches
);
3857 for (i
= 0; i
< LOCK_HASH_SIZE
; i
++) {
3858 list_for_each_entry(sop
, &lock_ownerid_hashtbl
[i
], so_idhash
) {
3859 if (!same_owner_str(sop
, owner
, clid
))
3861 list_for_each_entry(stp
, &sop
->so_stateids
,
3863 if (check_for_locks(stp
->st_vfs_file
, sop
))
3865 /* Note: so_perclient unused for lockowners,
3866 * so it's OK to fool with here. */
3867 list_add(&sop
->so_perclient
, &matches
);
3871 /* Clients probably won't expect us to return with some (but not all)
3872 * of the lockowner state released; so don't release any until all
3873 * have been checked. */
3875 while (!list_empty(&matches
)) {
3876 sop
= list_entry(matches
.next
, struct nfs4_stateowner
,
3878 /* unhash_stateowner deletes so_perclient only
3879 * for openowners. */
3880 list_del(&sop
->so_perclient
);
3881 release_lockowner(sop
);
3884 nfs4_unlock_state();
3888 static inline struct nfs4_client_reclaim
*
3891 return kmalloc(sizeof(struct nfs4_client_reclaim
), GFP_KERNEL
);
3895 nfs4_has_reclaimed_state(const char *name
, bool use_exchange_id
)
3897 unsigned int strhashval
= clientstr_hashval(name
);
3898 struct nfs4_client
*clp
;
3900 clp
= find_confirmed_client_by_str(name
, strhashval
, use_exchange_id
);
3905 * failure => all reset bets are off, nfserr_no_grace...
3908 nfs4_client_to_reclaim(const char *name
)
3910 unsigned int strhashval
;
3911 struct nfs4_client_reclaim
*crp
= NULL
;
3913 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN
, name
);
3914 crp
= alloc_reclaim();
3917 strhashval
= clientstr_hashval(name
);
3918 INIT_LIST_HEAD(&crp
->cr_strhash
);
3919 list_add(&crp
->cr_strhash
, &reclaim_str_hashtbl
[strhashval
]);
3920 memcpy(crp
->cr_recdir
, name
, HEXDIR_LEN
);
3921 reclaim_str_hashtbl_size
++;
3926 nfs4_release_reclaim(void)
3928 struct nfs4_client_reclaim
*crp
= NULL
;
3931 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
3932 while (!list_empty(&reclaim_str_hashtbl
[i
])) {
3933 crp
= list_entry(reclaim_str_hashtbl
[i
].next
,
3934 struct nfs4_client_reclaim
, cr_strhash
);
3935 list_del(&crp
->cr_strhash
);
3937 reclaim_str_hashtbl_size
--;
3940 BUG_ON(reclaim_str_hashtbl_size
);
3944 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3945 static struct nfs4_client_reclaim
*
3946 nfs4_find_reclaim_client(clientid_t
*clid
)
3948 unsigned int strhashval
;
3949 struct nfs4_client
*clp
;
3950 struct nfs4_client_reclaim
*crp
= NULL
;
3953 /* find clientid in conf_id_hashtbl */
3954 clp
= find_confirmed_client(clid
);
3958 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3959 clp
->cl_name
.len
, clp
->cl_name
.data
,
3962 /* find clp->cl_name in reclaim_str_hashtbl */
3963 strhashval
= clientstr_hashval(clp
->cl_recdir
);
3964 list_for_each_entry(crp
, &reclaim_str_hashtbl
[strhashval
], cr_strhash
) {
3965 if (same_name(crp
->cr_recdir
, clp
->cl_recdir
)) {
3973 * Called from OPEN. Look for clientid in reclaim list.
3976 nfs4_check_open_reclaim(clientid_t
*clid
)
3978 return nfs4_find_reclaim_client(clid
) ? nfs_ok
: nfserr_reclaim_bad
;
3981 /* initialization to perform at module load time: */
3984 nfs4_state_init(void)
3988 status
= nfsd4_init_slabs();
3991 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
3992 INIT_LIST_HEAD(&conf_id_hashtbl
[i
]);
3993 INIT_LIST_HEAD(&conf_str_hashtbl
[i
]);
3994 INIT_LIST_HEAD(&unconf_str_hashtbl
[i
]);
3995 INIT_LIST_HEAD(&unconf_id_hashtbl
[i
]);
3996 INIT_LIST_HEAD(&reclaim_str_hashtbl
[i
]);
3998 for (i
= 0; i
< SESSION_HASH_SIZE
; i
++)
3999 INIT_LIST_HEAD(&sessionid_hashtbl
[i
]);
4000 for (i
= 0; i
< FILE_HASH_SIZE
; i
++) {
4001 INIT_LIST_HEAD(&file_hashtbl
[i
]);
4003 for (i
= 0; i
< OWNER_HASH_SIZE
; i
++) {
4004 INIT_LIST_HEAD(&ownerstr_hashtbl
[i
]);
4005 INIT_LIST_HEAD(&ownerid_hashtbl
[i
]);
4007 for (i
= 0; i
< STATEID_HASH_SIZE
; i
++) {
4008 INIT_LIST_HEAD(&stateid_hashtbl
[i
]);
4009 INIT_LIST_HEAD(&lockstateid_hashtbl
[i
]);
4011 for (i
= 0; i
< LOCK_HASH_SIZE
; i
++) {
4012 INIT_LIST_HEAD(&lock_ownerid_hashtbl
[i
]);
4013 INIT_LIST_HEAD(&lock_ownerstr_hashtbl
[i
]);
4015 memset(&onestateid
, ~0, sizeof(stateid_t
));
4016 INIT_LIST_HEAD(&close_lru
);
4017 INIT_LIST_HEAD(&client_lru
);
4018 INIT_LIST_HEAD(&del_recall_lru
);
4019 reclaim_str_hashtbl_size
= 0;
4024 nfsd4_load_reboot_recovery_data(void)
4029 nfsd4_init_recdir(user_recovery_dirname
);
4030 status
= nfsd4_recdir_load();
4031 nfs4_unlock_state();
4033 printk("NFSD: Failure reading reboot recovery data\n");
4037 * Since the lifetime of a delegation isn't limited to that of an open, a
4038 * client may quite reasonably hang on to a delegation as long as it has
4039 * the inode cached. This becomes an obvious problem the first time a
4040 * client's inode cache approaches the size of the server's total memory.
4042 * For now we avoid this problem by imposing a hard limit on the number
4043 * of delegations, which varies according to the server's memory size.
4046 set_max_delegations(void)
4049 * Allow at most 4 delegations per megabyte of RAM. Quick
4050 * estimates suggest that in the worst case (where every delegation
4051 * is for a different inode), a delegation could take about 1.5K,
4052 * giving a worst case usage of about 6% of memory.
4054 max_delegations
= nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT
);
4057 /* initialization to perform when the nfsd service is started: */
4060 __nfs4_state_start(void)
4064 boot_time
= get_seconds();
4065 locks_start_grace(&nfsd4_manager
);
4066 printk(KERN_INFO
"NFSD: starting %ld-second grace period\n",
4068 ret
= set_callback_cred();
4071 laundry_wq
= create_singlethread_workqueue("nfsd4");
4072 if (laundry_wq
== NULL
)
4074 ret
= nfsd4_create_callback_queue();
4076 goto out_free_laundry
;
4077 queue_delayed_work(laundry_wq
, &laundromat_work
, nfsd4_grace
* HZ
);
4078 set_max_delegations();
4081 destroy_workqueue(laundry_wq
);
4086 nfs4_state_start(void)
4088 nfsd4_load_reboot_recovery_data();
4089 return __nfs4_state_start();
4093 __nfs4_state_shutdown(void)
4096 struct nfs4_client
*clp
= NULL
;
4097 struct nfs4_delegation
*dp
= NULL
;
4098 struct list_head
*pos
, *next
, reaplist
;
4100 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
4101 while (!list_empty(&conf_id_hashtbl
[i
])) {
4102 clp
= list_entry(conf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
4105 while (!list_empty(&unconf_str_hashtbl
[i
])) {
4106 clp
= list_entry(unconf_str_hashtbl
[i
].next
, struct nfs4_client
, cl_strhash
);
4110 INIT_LIST_HEAD(&reaplist
);
4111 spin_lock(&recall_lock
);
4112 list_for_each_safe(pos
, next
, &del_recall_lru
) {
4113 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
4114 list_move(&dp
->dl_recall_lru
, &reaplist
);
4116 spin_unlock(&recall_lock
);
4117 list_for_each_safe(pos
, next
, &reaplist
) {
4118 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
4119 list_del_init(&dp
->dl_recall_lru
);
4120 unhash_delegation(dp
);
4123 nfsd4_shutdown_recdir();
4127 nfs4_state_shutdown(void)
4129 cancel_rearming_delayed_workqueue(laundry_wq
, &laundromat_work
);
4130 destroy_workqueue(laundry_wq
);
4131 locks_end_grace(&nfsd4_manager
);
4133 nfs4_release_reclaim();
4134 __nfs4_state_shutdown();
4135 nfsd4_destroy_callback_queue();
4136 nfs4_unlock_state();
4140 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4141 * accessed when nfsd is starting.
4144 nfs4_set_recdir(char *recdir
)
4146 strcpy(user_recovery_dirname
, recdir
);
4150 * Change the NFSv4 recovery directory to recdir.
4153 nfs4_reset_recoverydir(char *recdir
)
4158 status
= kern_path(recdir
, LOOKUP_FOLLOW
, &path
);
4162 if (S_ISDIR(path
.dentry
->d_inode
->i_mode
)) {
4163 nfs4_set_recdir(recdir
);
4171 nfs4_recoverydir(void)
4173 return user_recovery_dirname
;