locks: eliminate fl_mylease callback
[linux-2.6/libata-dev.git] / fs / nfsd / nfs4state.c
blob87d4c48b606939048e22c10c4fc8c16873dcb378
1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
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
10 * are met:
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/fs.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>
42 #include "xdr4.h"
43 #include "vfs.h"
45 #define NFSDDBG_FACILITY NFSDDBG_PROC
47 /* Globals */
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);
67 /* Locking: */
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;
84 void
85 nfs4_lock_state(void)
87 mutex_lock(&client_mutex);
90 void
91 nfs4_unlock_state(void)
93 mutex_unlock(&client_mutex);
96 static inline u32
97 opaque_hashval(const void *ptr, int nbytes)
99 unsigned char *cptr = (unsigned char *) ptr;
101 u32 x = 0;
102 while (nbytes--) {
103 x *= 37;
104 x += *cptr++;
106 return x;
109 static struct list_head del_recall_lru;
111 static inline void
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);
117 iput(fi->fi_inode);
118 kmem_cache_free(file_slab, fi);
122 static inline void
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 void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
167 BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
168 atomic_inc(&fp->fi_access[oflag]);
171 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
173 if (oflag == O_RDWR) {
174 __nfs4_file_get_access(fp, O_RDONLY);
175 __nfs4_file_get_access(fp, O_WRONLY);
176 } else
177 __nfs4_file_get_access(fp, oflag);
180 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
182 if (fp->fi_fds[oflag]) {
183 fput(fp->fi_fds[oflag]);
184 fp->fi_fds[oflag] = NULL;
188 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
190 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
191 nfs4_file_put_fd(fp, O_RDWR);
192 nfs4_file_put_fd(fp, oflag);
196 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
198 if (oflag == O_RDWR) {
199 __nfs4_file_put_access(fp, O_RDONLY);
200 __nfs4_file_put_access(fp, O_WRONLY);
201 } else
202 __nfs4_file_put_access(fp, oflag);
205 static struct nfs4_delegation *
206 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
208 struct nfs4_delegation *dp;
209 struct nfs4_file *fp = stp->st_file;
211 dprintk("NFSD alloc_init_deleg\n");
213 * Major work on the lease subsystem (for example, to support
214 * calbacks on stat) will be required before we can support
215 * write delegations properly.
217 if (type != NFS4_OPEN_DELEGATE_READ)
218 return NULL;
219 if (fp->fi_had_conflict)
220 return NULL;
221 if (num_delegations > max_delegations)
222 return NULL;
223 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
224 if (dp == NULL)
225 return dp;
226 num_delegations++;
227 INIT_LIST_HEAD(&dp->dl_perfile);
228 INIT_LIST_HEAD(&dp->dl_perclnt);
229 INIT_LIST_HEAD(&dp->dl_recall_lru);
230 dp->dl_client = clp;
231 get_nfs4_file(fp);
232 dp->dl_file = fp;
233 dp->dl_vfs_file = find_readable_file(fp);
234 get_file(dp->dl_vfs_file);
235 dp->dl_flock = NULL;
236 dp->dl_type = type;
237 dp->dl_stateid.si_boot = boot_time;
238 dp->dl_stateid.si_stateownerid = current_delegid++;
239 dp->dl_stateid.si_fileid = 0;
240 dp->dl_stateid.si_generation = 0;
241 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
242 dp->dl_time = 0;
243 atomic_set(&dp->dl_count, 1);
244 list_add(&dp->dl_perfile, &fp->fi_delegations);
245 list_add(&dp->dl_perclnt, &clp->cl_delegations);
246 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
247 return dp;
250 void
251 nfs4_put_delegation(struct nfs4_delegation *dp)
253 if (atomic_dec_and_test(&dp->dl_count)) {
254 dprintk("NFSD: freeing dp %p\n",dp);
255 put_nfs4_file(dp->dl_file);
256 fput(dp->dl_vfs_file);
257 kmem_cache_free(deleg_slab, dp);
258 num_delegations--;
262 /* Remove the associated file_lock first, then remove the delegation.
263 * lease_modify() is called to remove the FS_LEASE file_lock from
264 * the i_flock list, eventually calling nfsd's lock_manager
265 * fl_release_callback.
267 static void
268 nfs4_close_delegation(struct nfs4_delegation *dp)
270 dprintk("NFSD: close_delegation dp %p\n",dp);
271 /* XXX: do we even need this check?: */
272 if (dp->dl_flock)
273 vfs_setlease(dp->dl_vfs_file, F_UNLCK, &dp->dl_flock);
276 /* Called under the state lock. */
277 static void
278 unhash_delegation(struct nfs4_delegation *dp)
280 list_del_init(&dp->dl_perfile);
281 list_del_init(&dp->dl_perclnt);
282 spin_lock(&recall_lock);
283 list_del_init(&dp->dl_recall_lru);
284 spin_unlock(&recall_lock);
285 nfs4_close_delegation(dp);
286 nfs4_put_delegation(dp);
290 * SETCLIENTID state
293 /* client_lock protects the client lru list and session hash table */
294 static DEFINE_SPINLOCK(client_lock);
296 /* Hash tables for nfs4_clientid state */
297 #define CLIENT_HASH_BITS 4
298 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
299 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
301 #define clientid_hashval(id) \
302 ((id) & CLIENT_HASH_MASK)
303 #define clientstr_hashval(name) \
304 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
306 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
307 * used in reboot/reset lease grace period processing
309 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
310 * setclientid_confirmed info.
312 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
313 * setclientid info.
315 * client_lru holds client queue ordered by nfs4_client.cl_time
316 * for lease renewal.
318 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
319 * for last close replay.
321 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
322 static int reclaim_str_hashtbl_size = 0;
323 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
324 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
325 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
326 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
327 static struct list_head client_lru;
328 static struct list_head close_lru;
330 static void unhash_generic_stateid(struct nfs4_stateid *stp)
332 list_del(&stp->st_hash);
333 list_del(&stp->st_perfile);
334 list_del(&stp->st_perstateowner);
337 static void free_generic_stateid(struct nfs4_stateid *stp)
339 put_nfs4_file(stp->st_file);
340 kmem_cache_free(stateid_slab, stp);
343 static void release_lock_stateid(struct nfs4_stateid *stp)
345 struct file *file;
347 unhash_generic_stateid(stp);
348 file = find_any_file(stp->st_file);
349 if (file)
350 locks_remove_posix(file, (fl_owner_t)stp->st_stateowner);
351 free_generic_stateid(stp);
354 static void unhash_lockowner(struct nfs4_stateowner *sop)
356 struct nfs4_stateid *stp;
358 list_del(&sop->so_idhash);
359 list_del(&sop->so_strhash);
360 list_del(&sop->so_perstateid);
361 while (!list_empty(&sop->so_stateids)) {
362 stp = list_first_entry(&sop->so_stateids,
363 struct nfs4_stateid, st_perstateowner);
364 release_lock_stateid(stp);
368 static void release_lockowner(struct nfs4_stateowner *sop)
370 unhash_lockowner(sop);
371 nfs4_put_stateowner(sop);
374 static void
375 release_stateid_lockowners(struct nfs4_stateid *open_stp)
377 struct nfs4_stateowner *lock_sop;
379 while (!list_empty(&open_stp->st_lockowners)) {
380 lock_sop = list_entry(open_stp->st_lockowners.next,
381 struct nfs4_stateowner, so_perstateid);
382 /* list_del(&open_stp->st_lockowners); */
383 BUG_ON(lock_sop->so_is_open_owner);
384 release_lockowner(lock_sop);
389 * We store the NONE, READ, WRITE, and BOTH bits separately in the
390 * st_{access,deny}_bmap field of the stateid, in order to track not
391 * only what share bits are currently in force, but also what
392 * combinations of share bits previous opens have used. This allows us
393 * to enforce the recommendation of rfc 3530 14.2.19 that the server
394 * return an error if the client attempt to downgrade to a combination
395 * of share bits not explicable by closing some of its previous opens.
397 * XXX: This enforcement is actually incomplete, since we don't keep
398 * track of access/deny bit combinations; so, e.g., we allow:
400 * OPEN allow read, deny write
401 * OPEN allow both, deny none
402 * DOWNGRADE allow read, deny none
404 * which we should reject.
406 static void
407 set_access(unsigned int *access, unsigned long bmap) {
408 int i;
410 *access = 0;
411 for (i = 1; i < 4; i++) {
412 if (test_bit(i, &bmap))
413 *access |= i;
417 static void
418 set_deny(unsigned int *deny, unsigned long bmap) {
419 int i;
421 *deny = 0;
422 for (i = 0; i < 4; i++) {
423 if (test_bit(i, &bmap))
424 *deny |= i ;
428 static int
429 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
430 unsigned int access, deny;
432 set_access(&access, stp->st_access_bmap);
433 set_deny(&deny, stp->st_deny_bmap);
434 if ((access & open->op_share_deny) || (deny & open->op_share_access))
435 return 0;
436 return 1;
439 static int nfs4_access_to_omode(u32 access)
441 switch (access & NFS4_SHARE_ACCESS_BOTH) {
442 case NFS4_SHARE_ACCESS_READ:
443 return O_RDONLY;
444 case NFS4_SHARE_ACCESS_WRITE:
445 return O_WRONLY;
446 case NFS4_SHARE_ACCESS_BOTH:
447 return O_RDWR;
449 BUG();
452 static int nfs4_access_bmap_to_omode(struct nfs4_stateid *stp)
454 unsigned int access;
456 set_access(&access, stp->st_access_bmap);
457 return nfs4_access_to_omode(access);
460 static void release_open_stateid(struct nfs4_stateid *stp)
462 int oflag = nfs4_access_bmap_to_omode(stp);
464 unhash_generic_stateid(stp);
465 release_stateid_lockowners(stp);
466 nfs4_file_put_access(stp->st_file, oflag);
467 free_generic_stateid(stp);
470 static void unhash_openowner(struct nfs4_stateowner *sop)
472 struct nfs4_stateid *stp;
474 list_del(&sop->so_idhash);
475 list_del(&sop->so_strhash);
476 list_del(&sop->so_perclient);
477 list_del(&sop->so_perstateid); /* XXX: necessary? */
478 while (!list_empty(&sop->so_stateids)) {
479 stp = list_first_entry(&sop->so_stateids,
480 struct nfs4_stateid, st_perstateowner);
481 release_open_stateid(stp);
485 static void release_openowner(struct nfs4_stateowner *sop)
487 unhash_openowner(sop);
488 list_del(&sop->so_close_lru);
489 nfs4_put_stateowner(sop);
492 #define SESSION_HASH_SIZE 512
493 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
495 static inline int
496 hash_sessionid(struct nfs4_sessionid *sessionid)
498 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
500 return sid->sequence % SESSION_HASH_SIZE;
503 static inline void
504 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
506 u32 *ptr = (u32 *)(&sessionid->data[0]);
507 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
510 static void
511 gen_sessionid(struct nfsd4_session *ses)
513 struct nfs4_client *clp = ses->se_client;
514 struct nfsd4_sessionid *sid;
516 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
517 sid->clientid = clp->cl_clientid;
518 sid->sequence = current_sessionid++;
519 sid->reserved = 0;
523 * The protocol defines ca_maxresponssize_cached to include the size of
524 * the rpc header, but all we need to cache is the data starting after
525 * the end of the initial SEQUENCE operation--the rest we regenerate
526 * each time. Therefore we can advertise a ca_maxresponssize_cached
527 * value that is the number of bytes in our cache plus a few additional
528 * bytes. In order to stay on the safe side, and not promise more than
529 * we can cache, those additional bytes must be the minimum possible: 24
530 * bytes of rpc header (xid through accept state, with AUTH_NULL
531 * verifier), 12 for the compound header (with zero-length tag), and 44
532 * for the SEQUENCE op response:
534 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
536 static void
537 free_session_slots(struct nfsd4_session *ses)
539 int i;
541 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
542 kfree(ses->se_slots[i]);
546 * We don't actually need to cache the rpc and session headers, so we
547 * can allocate a little less for each slot:
549 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
551 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
554 static int nfsd4_sanitize_slot_size(u32 size)
556 size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
557 size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
559 return size;
563 * XXX: If we run out of reserved DRC memory we could (up to a point)
564 * re-negotiate active sessions and reduce their slot usage to make
565 * rooom for new connections. For now we just fail the create session.
567 static int nfsd4_get_drc_mem(int slotsize, u32 num)
569 int avail;
571 num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
573 spin_lock(&nfsd_drc_lock);
574 avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
575 nfsd_drc_max_mem - nfsd_drc_mem_used);
576 num = min_t(int, num, avail / slotsize);
577 nfsd_drc_mem_used += num * slotsize;
578 spin_unlock(&nfsd_drc_lock);
580 return num;
583 static void nfsd4_put_drc_mem(int slotsize, int num)
585 spin_lock(&nfsd_drc_lock);
586 nfsd_drc_mem_used -= slotsize * num;
587 spin_unlock(&nfsd_drc_lock);
590 static struct nfsd4_session *alloc_session(int slotsize, int numslots)
592 struct nfsd4_session *new;
593 int mem, i;
595 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
596 + sizeof(struct nfsd4_session) > PAGE_SIZE);
597 mem = numslots * sizeof(struct nfsd4_slot *);
599 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
600 if (!new)
601 return NULL;
602 /* allocate each struct nfsd4_slot and data cache in one piece */
603 for (i = 0; i < numslots; i++) {
604 mem = sizeof(struct nfsd4_slot) + slotsize;
605 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
606 if (!new->se_slots[i])
607 goto out_free;
609 return new;
610 out_free:
611 while (i--)
612 kfree(new->se_slots[i]);
613 kfree(new);
614 return NULL;
617 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
619 u32 maxrpc = nfsd_serv->sv_max_mesg;
621 new->maxreqs = numslots;
622 new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ;
623 new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
624 new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
625 new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
628 static void free_conn(struct nfsd4_conn *c)
630 svc_xprt_put(c->cn_xprt);
631 kfree(c);
634 static void nfsd4_conn_lost(struct svc_xpt_user *u)
636 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
637 struct nfs4_client *clp = c->cn_session->se_client;
639 spin_lock(&clp->cl_lock);
640 if (!list_empty(&c->cn_persession)) {
641 list_del(&c->cn_persession);
642 free_conn(c);
644 spin_unlock(&clp->cl_lock);
647 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
649 struct nfsd4_conn *conn;
651 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
652 if (!conn)
653 return NULL;
654 svc_xprt_get(rqstp->rq_xprt);
655 conn->cn_xprt = rqstp->rq_xprt;
656 conn->cn_flags = flags;
657 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
658 return conn;
661 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
663 conn->cn_session = ses;
664 list_add(&conn->cn_persession, &ses->se_conns);
667 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
669 struct nfs4_client *clp = ses->se_client;
671 spin_lock(&clp->cl_lock);
672 __nfsd4_hash_conn(conn, ses);
673 spin_unlock(&clp->cl_lock);
676 static int nfsd4_register_conn(struct nfsd4_conn *conn)
678 conn->cn_xpt_user.callback = nfsd4_conn_lost;
679 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
682 static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses)
684 struct nfsd4_conn *conn;
685 u32 flags = NFS4_CDFC4_FORE;
686 int ret;
688 if (ses->se_flags & SESSION4_BACK_CHAN)
689 flags |= NFS4_CDFC4_BACK;
690 conn = alloc_conn(rqstp, flags);
691 if (!conn)
692 return nfserr_jukebox;
693 nfsd4_hash_conn(conn, ses);
694 ret = nfsd4_register_conn(conn);
695 if (ret)
696 /* oops; xprt is already down: */
697 nfsd4_conn_lost(&conn->cn_xpt_user);
698 return nfs_ok;
701 static void nfsd4_del_conns(struct nfsd4_session *s)
703 struct nfs4_client *clp = s->se_client;
704 struct nfsd4_conn *c;
706 spin_lock(&clp->cl_lock);
707 while (!list_empty(&s->se_conns)) {
708 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
709 list_del_init(&c->cn_persession);
710 spin_unlock(&clp->cl_lock);
712 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
713 free_conn(c);
715 spin_lock(&clp->cl_lock);
717 spin_unlock(&clp->cl_lock);
720 void free_session(struct kref *kref)
722 struct nfsd4_session *ses;
723 int mem;
725 ses = container_of(kref, struct nfsd4_session, se_ref);
726 nfsd4_del_conns(ses);
727 spin_lock(&nfsd_drc_lock);
728 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
729 nfsd_drc_mem_used -= mem;
730 spin_unlock(&nfsd_drc_lock);
731 free_session_slots(ses);
732 kfree(ses);
735 static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
737 struct nfsd4_session *new;
738 struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
739 int numslots, slotsize;
740 int status;
741 int idx;
744 * Note decreasing slot size below client's request may
745 * make it difficult for client to function correctly, whereas
746 * decreasing the number of slots will (just?) affect
747 * performance. When short on memory we therefore prefer to
748 * decrease number of slots instead of their size.
750 slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
751 numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
752 if (numslots < 1)
753 return NULL;
755 new = alloc_session(slotsize, numslots);
756 if (!new) {
757 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
758 return NULL;
760 init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
762 new->se_client = clp;
763 gen_sessionid(new);
765 INIT_LIST_HEAD(&new->se_conns);
767 new->se_cb_seq_nr = 1;
768 new->se_flags = cses->flags;
769 new->se_cb_prog = cses->callback_prog;
770 kref_init(&new->se_ref);
771 idx = hash_sessionid(&new->se_sessionid);
772 spin_lock(&client_lock);
773 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
774 list_add(&new->se_perclnt, &clp->cl_sessions);
775 spin_unlock(&client_lock);
777 status = nfsd4_new_conn(rqstp, new);
778 /* whoops: benny points out, status is ignored! (err, or bogus) */
779 if (status) {
780 free_session(&new->se_ref);
781 return NULL;
783 if (!clp->cl_cb_session && (cses->flags & SESSION4_BACK_CHAN)) {
784 struct sockaddr *sa = svc_addr(rqstp);
786 clp->cl_cb_session = new;
787 clp->cl_cb_conn.cb_xprt = rqstp->rq_xprt;
788 svc_xprt_get(rqstp->rq_xprt);
789 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
790 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
791 nfsd4_probe_callback(clp);
793 return new;
796 /* caller must hold client_lock */
797 static struct nfsd4_session *
798 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
800 struct nfsd4_session *elem;
801 int idx;
803 dump_sessionid(__func__, sessionid);
804 idx = hash_sessionid(sessionid);
805 /* Search in the appropriate list */
806 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
807 if (!memcmp(elem->se_sessionid.data, sessionid->data,
808 NFS4_MAX_SESSIONID_LEN)) {
809 return elem;
813 dprintk("%s: session not found\n", __func__);
814 return NULL;
817 /* caller must hold client_lock */
818 static void
819 unhash_session(struct nfsd4_session *ses)
821 list_del(&ses->se_hash);
822 list_del(&ses->se_perclnt);
825 /* must be called under the client_lock */
826 static inline void
827 renew_client_locked(struct nfs4_client *clp)
829 if (is_client_expired(clp)) {
830 dprintk("%s: client (clientid %08x/%08x) already expired\n",
831 __func__,
832 clp->cl_clientid.cl_boot,
833 clp->cl_clientid.cl_id);
834 return;
838 * Move client to the end to the LRU list.
840 dprintk("renewing client (clientid %08x/%08x)\n",
841 clp->cl_clientid.cl_boot,
842 clp->cl_clientid.cl_id);
843 list_move_tail(&clp->cl_lru, &client_lru);
844 clp->cl_time = get_seconds();
847 static inline void
848 renew_client(struct nfs4_client *clp)
850 spin_lock(&client_lock);
851 renew_client_locked(clp);
852 spin_unlock(&client_lock);
855 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
856 static int
857 STALE_CLIENTID(clientid_t *clid)
859 if (clid->cl_boot == boot_time)
860 return 0;
861 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
862 clid->cl_boot, clid->cl_id, boot_time);
863 return 1;
867 * XXX Should we use a slab cache ?
868 * This type of memory management is somewhat inefficient, but we use it
869 * anyway since SETCLIENTID is not a common operation.
871 static struct nfs4_client *alloc_client(struct xdr_netobj name)
873 struct nfs4_client *clp;
875 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
876 if (clp == NULL)
877 return NULL;
878 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
879 if (clp->cl_name.data == NULL) {
880 kfree(clp);
881 return NULL;
883 memcpy(clp->cl_name.data, name.data, name.len);
884 clp->cl_name.len = name.len;
885 return clp;
888 static inline void
889 free_client(struct nfs4_client *clp)
891 while (!list_empty(&clp->cl_sessions)) {
892 struct nfsd4_session *ses;
893 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
894 se_perclnt);
895 list_del(&ses->se_perclnt);
896 nfsd4_put_session(ses);
898 if (clp->cl_cred.cr_group_info)
899 put_group_info(clp->cl_cred.cr_group_info);
900 kfree(clp->cl_principal);
901 kfree(clp->cl_name.data);
902 kfree(clp);
905 void
906 release_session_client(struct nfsd4_session *session)
908 struct nfs4_client *clp = session->se_client;
910 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
911 return;
912 if (is_client_expired(clp)) {
913 free_client(clp);
914 session->se_client = NULL;
915 } else
916 renew_client_locked(clp);
917 spin_unlock(&client_lock);
920 /* must be called under the client_lock */
921 static inline void
922 unhash_client_locked(struct nfs4_client *clp)
924 struct nfsd4_session *ses;
926 mark_client_expired(clp);
927 list_del(&clp->cl_lru);
928 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
929 list_del_init(&ses->se_hash);
932 static void
933 expire_client(struct nfs4_client *clp)
935 struct nfs4_stateowner *sop;
936 struct nfs4_delegation *dp;
937 struct list_head reaplist;
939 INIT_LIST_HEAD(&reaplist);
940 spin_lock(&recall_lock);
941 while (!list_empty(&clp->cl_delegations)) {
942 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
943 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
944 dp->dl_flock);
945 list_del_init(&dp->dl_perclnt);
946 list_move(&dp->dl_recall_lru, &reaplist);
948 spin_unlock(&recall_lock);
949 while (!list_empty(&reaplist)) {
950 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
951 list_del_init(&dp->dl_recall_lru);
952 unhash_delegation(dp);
954 while (!list_empty(&clp->cl_openowners)) {
955 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
956 release_openowner(sop);
958 nfsd4_shutdown_callback(clp);
959 if (clp->cl_cb_conn.cb_xprt)
960 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
961 list_del(&clp->cl_idhash);
962 list_del(&clp->cl_strhash);
963 spin_lock(&client_lock);
964 unhash_client_locked(clp);
965 if (atomic_read(&clp->cl_refcount) == 0)
966 free_client(clp);
967 spin_unlock(&client_lock);
970 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
972 memcpy(target->cl_verifier.data, source->data,
973 sizeof(target->cl_verifier.data));
976 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
978 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
979 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
982 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
984 target->cr_uid = source->cr_uid;
985 target->cr_gid = source->cr_gid;
986 target->cr_group_info = source->cr_group_info;
987 get_group_info(target->cr_group_info);
990 static int same_name(const char *n1, const char *n2)
992 return 0 == memcmp(n1, n2, HEXDIR_LEN);
995 static int
996 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
998 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1001 static int
1002 same_clid(clientid_t *cl1, clientid_t *cl2)
1004 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1007 /* XXX what about NGROUP */
1008 static int
1009 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1011 return cr1->cr_uid == cr2->cr_uid;
1014 static void gen_clid(struct nfs4_client *clp)
1016 static u32 current_clientid = 1;
1018 clp->cl_clientid.cl_boot = boot_time;
1019 clp->cl_clientid.cl_id = current_clientid++;
1022 static void gen_confirm(struct nfs4_client *clp)
1024 static u32 i;
1025 u32 *p;
1027 p = (u32 *)clp->cl_confirm.data;
1028 *p++ = get_seconds();
1029 *p++ = i++;
1032 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
1033 struct svc_rqst *rqstp, nfs4_verifier *verf)
1035 struct nfs4_client *clp;
1036 struct sockaddr *sa = svc_addr(rqstp);
1037 char *princ;
1039 clp = alloc_client(name);
1040 if (clp == NULL)
1041 return NULL;
1043 INIT_LIST_HEAD(&clp->cl_sessions);
1045 princ = svc_gss_principal(rqstp);
1046 if (princ) {
1047 clp->cl_principal = kstrdup(princ, GFP_KERNEL);
1048 if (clp->cl_principal == NULL) {
1049 free_client(clp);
1050 return NULL;
1054 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1055 atomic_set(&clp->cl_refcount, 0);
1056 atomic_set(&clp->cl_cb_set, 0);
1057 INIT_LIST_HEAD(&clp->cl_idhash);
1058 INIT_LIST_HEAD(&clp->cl_strhash);
1059 INIT_LIST_HEAD(&clp->cl_openowners);
1060 INIT_LIST_HEAD(&clp->cl_delegations);
1061 INIT_LIST_HEAD(&clp->cl_lru);
1062 spin_lock_init(&clp->cl_lock);
1063 INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
1064 clp->cl_time = get_seconds();
1065 clear_bit(0, &clp->cl_cb_slot_busy);
1066 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1067 copy_verf(clp, verf);
1068 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1069 clp->cl_flavor = rqstp->rq_flavor;
1070 copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1071 gen_confirm(clp);
1072 clp->cl_cb_session = NULL;
1073 return clp;
1076 static int check_name(struct xdr_netobj name)
1078 if (name.len == 0)
1079 return 0;
1080 if (name.len > NFS4_OPAQUE_LIMIT) {
1081 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1082 return 0;
1084 return 1;
1087 static void
1088 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1090 unsigned int idhashval;
1092 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1093 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1094 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1095 renew_client(clp);
1098 static void
1099 move_to_confirmed(struct nfs4_client *clp)
1101 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1102 unsigned int strhashval;
1104 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1105 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1106 strhashval = clientstr_hashval(clp->cl_recdir);
1107 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1108 renew_client(clp);
1111 static struct nfs4_client *
1112 find_confirmed_client(clientid_t *clid)
1114 struct nfs4_client *clp;
1115 unsigned int idhashval = clientid_hashval(clid->cl_id);
1117 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1118 if (same_clid(&clp->cl_clientid, clid))
1119 return clp;
1121 return NULL;
1124 static struct nfs4_client *
1125 find_unconfirmed_client(clientid_t *clid)
1127 struct nfs4_client *clp;
1128 unsigned int idhashval = clientid_hashval(clid->cl_id);
1130 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1131 if (same_clid(&clp->cl_clientid, clid))
1132 return clp;
1134 return NULL;
1137 static bool clp_used_exchangeid(struct nfs4_client *clp)
1139 return clp->cl_exchange_flags != 0;
1142 static struct nfs4_client *
1143 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
1145 struct nfs4_client *clp;
1147 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
1148 if (same_name(clp->cl_recdir, dname))
1149 return clp;
1151 return NULL;
1154 static struct nfs4_client *
1155 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
1157 struct nfs4_client *clp;
1159 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
1160 if (same_name(clp->cl_recdir, dname))
1161 return clp;
1163 return NULL;
1166 static void
1167 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid)
1169 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1170 unsigned short expected_family;
1172 /* Currently, we only support tcp and tcp6 for the callback channel */
1173 if (se->se_callback_netid_len == 3 &&
1174 !memcmp(se->se_callback_netid_val, "tcp", 3))
1175 expected_family = AF_INET;
1176 else if (se->se_callback_netid_len == 4 &&
1177 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1178 expected_family = AF_INET6;
1179 else
1180 goto out_err;
1182 conn->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
1183 se->se_callback_addr_len,
1184 (struct sockaddr *)&conn->cb_addr,
1185 sizeof(conn->cb_addr));
1187 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1188 goto out_err;
1190 if (conn->cb_addr.ss_family == AF_INET6)
1191 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1193 conn->cb_prog = se->se_callback_prog;
1194 conn->cb_ident = se->se_callback_ident;
1195 return;
1196 out_err:
1197 conn->cb_addr.ss_family = AF_UNSPEC;
1198 conn->cb_addrlen = 0;
1199 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1200 "will not receive delegations\n",
1201 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1203 return;
1207 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1209 void
1210 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1212 struct nfsd4_slot *slot = resp->cstate.slot;
1213 unsigned int base;
1215 dprintk("--> %s slot %p\n", __func__, slot);
1217 slot->sl_opcnt = resp->opcnt;
1218 slot->sl_status = resp->cstate.status;
1220 if (nfsd4_not_cached(resp)) {
1221 slot->sl_datalen = 0;
1222 return;
1224 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1225 base = (char *)resp->cstate.datap -
1226 (char *)resp->xbuf->head[0].iov_base;
1227 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1228 slot->sl_datalen))
1229 WARN("%s: sessions DRC could not cache compound\n", __func__);
1230 return;
1234 * Encode the replay sequence operation from the slot values.
1235 * If cachethis is FALSE encode the uncached rep error on the next
1236 * operation which sets resp->p and increments resp->opcnt for
1237 * nfs4svc_encode_compoundres.
1240 static __be32
1241 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1242 struct nfsd4_compoundres *resp)
1244 struct nfsd4_op *op;
1245 struct nfsd4_slot *slot = resp->cstate.slot;
1247 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
1248 resp->opcnt, resp->cstate.slot->sl_cachethis);
1250 /* Encode the replayed sequence operation */
1251 op = &args->ops[resp->opcnt - 1];
1252 nfsd4_encode_operation(resp, op);
1254 /* Return nfserr_retry_uncached_rep in next operation. */
1255 if (args->opcnt > 1 && slot->sl_cachethis == 0) {
1256 op = &args->ops[resp->opcnt++];
1257 op->status = nfserr_retry_uncached_rep;
1258 nfsd4_encode_operation(resp, op);
1260 return op->status;
1264 * The sequence operation is not cached because we can use the slot and
1265 * session values.
1267 __be32
1268 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1269 struct nfsd4_sequence *seq)
1271 struct nfsd4_slot *slot = resp->cstate.slot;
1272 __be32 status;
1274 dprintk("--> %s slot %p\n", __func__, slot);
1276 /* Either returns 0 or nfserr_retry_uncached */
1277 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1278 if (status == nfserr_retry_uncached_rep)
1279 return status;
1281 /* The sequence operation has been encoded, cstate->datap set. */
1282 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1284 resp->opcnt = slot->sl_opcnt;
1285 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1286 status = slot->sl_status;
1288 return status;
1292 * Set the exchange_id flags returned by the server.
1294 static void
1295 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1297 /* pNFS is not supported */
1298 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1300 /* Referrals are supported, Migration is not. */
1301 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1303 /* set the wire flags to return to client. */
1304 clid->flags = new->cl_exchange_flags;
1307 __be32
1308 nfsd4_exchange_id(struct svc_rqst *rqstp,
1309 struct nfsd4_compound_state *cstate,
1310 struct nfsd4_exchange_id *exid)
1312 struct nfs4_client *unconf, *conf, *new;
1313 int status;
1314 unsigned int strhashval;
1315 char dname[HEXDIR_LEN];
1316 char addr_str[INET6_ADDRSTRLEN];
1317 nfs4_verifier verf = exid->verifier;
1318 struct sockaddr *sa = svc_addr(rqstp);
1320 rpc_ntop(sa, addr_str, sizeof(addr_str));
1321 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1322 "ip_addr=%s flags %x, spa_how %d\n",
1323 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1324 addr_str, exid->flags, exid->spa_how);
1326 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1327 return nfserr_inval;
1329 /* Currently only support SP4_NONE */
1330 switch (exid->spa_how) {
1331 case SP4_NONE:
1332 break;
1333 case SP4_SSV:
1334 return nfserr_serverfault;
1335 default:
1336 BUG(); /* checked by xdr code */
1337 case SP4_MACH_CRED:
1338 return nfserr_serverfault; /* no excuse :-/ */
1341 status = nfs4_make_rec_clidname(dname, &exid->clname);
1343 if (status)
1344 goto error;
1346 strhashval = clientstr_hashval(dname);
1348 nfs4_lock_state();
1349 status = nfs_ok;
1351 conf = find_confirmed_client_by_str(dname, strhashval);
1352 if (conf) {
1353 if (!clp_used_exchangeid(conf)) {
1354 status = nfserr_clid_inuse; /* XXX: ? */
1355 goto out;
1357 if (!same_verf(&verf, &conf->cl_verifier)) {
1358 /* 18.35.4 case 8 */
1359 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1360 status = nfserr_not_same;
1361 goto out;
1363 /* Client reboot: destroy old state */
1364 expire_client(conf);
1365 goto out_new;
1367 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1368 /* 18.35.4 case 9 */
1369 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1370 status = nfserr_perm;
1371 goto out;
1373 expire_client(conf);
1374 goto out_new;
1377 * Set bit when the owner id and verifier map to an already
1378 * confirmed client id (18.35.3).
1380 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1383 * Falling into 18.35.4 case 2, possible router replay.
1384 * Leave confirmed record intact and return same result.
1386 copy_verf(conf, &verf);
1387 new = conf;
1388 goto out_copy;
1391 /* 18.35.4 case 7 */
1392 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1393 status = nfserr_noent;
1394 goto out;
1397 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1398 if (unconf) {
1400 * Possible retry or client restart. Per 18.35.4 case 4,
1401 * a new unconfirmed record should be generated regardless
1402 * of whether any properties have changed.
1404 expire_client(unconf);
1407 out_new:
1408 /* Normal case */
1409 new = create_client(exid->clname, dname, rqstp, &verf);
1410 if (new == NULL) {
1411 status = nfserr_jukebox;
1412 goto out;
1415 gen_clid(new);
1416 add_to_unconfirmed(new, strhashval);
1417 out_copy:
1418 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1419 exid->clientid.cl_id = new->cl_clientid.cl_id;
1421 exid->seqid = 1;
1422 nfsd4_set_ex_flags(new, exid);
1424 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1425 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1426 status = nfs_ok;
1428 out:
1429 nfs4_unlock_state();
1430 error:
1431 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1432 return status;
1435 static int
1436 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1438 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1439 slot_seqid);
1441 /* The slot is in use, and no response has been sent. */
1442 if (slot_inuse) {
1443 if (seqid == slot_seqid)
1444 return nfserr_jukebox;
1445 else
1446 return nfserr_seq_misordered;
1448 /* Normal */
1449 if (likely(seqid == slot_seqid + 1))
1450 return nfs_ok;
1451 /* Replay */
1452 if (seqid == slot_seqid)
1453 return nfserr_replay_cache;
1454 /* Wraparound */
1455 if (seqid == 1 && (slot_seqid + 1) == 0)
1456 return nfs_ok;
1457 /* Misordered replay or misordered new request */
1458 return nfserr_seq_misordered;
1462 * Cache the create session result into the create session single DRC
1463 * slot cache by saving the xdr structure. sl_seqid has been set.
1464 * Do this for solo or embedded create session operations.
1466 static void
1467 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1468 struct nfsd4_clid_slot *slot, int nfserr)
1470 slot->sl_status = nfserr;
1471 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1474 static __be32
1475 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1476 struct nfsd4_clid_slot *slot)
1478 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1479 return slot->sl_status;
1482 __be32
1483 nfsd4_create_session(struct svc_rqst *rqstp,
1484 struct nfsd4_compound_state *cstate,
1485 struct nfsd4_create_session *cr_ses)
1487 struct sockaddr *sa = svc_addr(rqstp);
1488 struct nfs4_client *conf, *unconf;
1489 struct nfsd4_session *new;
1490 struct nfsd4_clid_slot *cs_slot = NULL;
1491 bool confirm_me = false;
1492 int status = 0;
1494 nfs4_lock_state();
1495 unconf = find_unconfirmed_client(&cr_ses->clientid);
1496 conf = find_confirmed_client(&cr_ses->clientid);
1498 if (conf) {
1499 cs_slot = &conf->cl_cs_slot;
1500 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1501 if (status == nfserr_replay_cache) {
1502 dprintk("Got a create_session replay! seqid= %d\n",
1503 cs_slot->sl_seqid);
1504 /* Return the cached reply status */
1505 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1506 goto out;
1507 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1508 status = nfserr_seq_misordered;
1509 dprintk("Sequence misordered!\n");
1510 dprintk("Expected seqid= %d but got seqid= %d\n",
1511 cs_slot->sl_seqid, cr_ses->seqid);
1512 goto out;
1514 } else if (unconf) {
1515 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1516 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1517 status = nfserr_clid_inuse;
1518 goto out;
1521 cs_slot = &unconf->cl_cs_slot;
1522 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1523 if (status) {
1524 /* an unconfirmed replay returns misordered */
1525 status = nfserr_seq_misordered;
1526 goto out;
1529 confirm_me = true;
1530 conf = unconf;
1531 } else {
1532 status = nfserr_stale_clientid;
1533 goto out;
1537 * XXX: we should probably set this at creation time, and check
1538 * for consistent minorversion use throughout:
1540 conf->cl_minorversion = 1;
1542 * We do not support RDMA or persistent sessions
1544 cr_ses->flags &= ~SESSION4_PERSIST;
1545 cr_ses->flags &= ~SESSION4_RDMA;
1547 status = nfserr_jukebox;
1548 new = alloc_init_session(rqstp, conf, cr_ses);
1549 if (!new)
1550 goto out;
1551 status = nfs_ok;
1552 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1553 NFS4_MAX_SESSIONID_LEN);
1554 memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1555 sizeof(struct nfsd4_channel_attrs));
1556 cs_slot->sl_seqid++;
1557 cr_ses->seqid = cs_slot->sl_seqid;
1559 /* cache solo and embedded create sessions under the state lock */
1560 nfsd4_cache_create_session(cr_ses, cs_slot, status);
1561 if (confirm_me)
1562 move_to_confirmed(conf);
1563 out:
1564 nfs4_unlock_state();
1565 dprintk("%s returns %d\n", __func__, ntohl(status));
1566 return status;
1569 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1571 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1572 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1574 return argp->opcnt == resp->opcnt;
1577 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1579 if (!session)
1580 return 0;
1581 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1584 __be32
1585 nfsd4_destroy_session(struct svc_rqst *r,
1586 struct nfsd4_compound_state *cstate,
1587 struct nfsd4_destroy_session *sessionid)
1589 struct nfsd4_session *ses;
1590 u32 status = nfserr_badsession;
1592 /* Notes:
1593 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1594 * - Should we return nfserr_back_chan_busy if waiting for
1595 * callbacks on to-be-destroyed session?
1596 * - Do we need to clear any callback info from previous session?
1599 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1600 if (!nfsd4_last_compound_op(r))
1601 return nfserr_not_only_op;
1603 dump_sessionid(__func__, &sessionid->sessionid);
1604 spin_lock(&client_lock);
1605 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1606 if (!ses) {
1607 spin_unlock(&client_lock);
1608 goto out;
1611 unhash_session(ses);
1612 spin_unlock(&client_lock);
1614 nfs4_lock_state();
1615 /* wait for callbacks */
1616 nfsd4_shutdown_callback(ses->se_client);
1617 nfs4_unlock_state();
1619 nfsd4_del_conns(ses);
1621 nfsd4_put_session(ses);
1622 status = nfs_ok;
1623 out:
1624 dprintk("%s returns %d\n", __func__, ntohl(status));
1625 return status;
1628 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1630 struct nfsd4_conn *c;
1632 list_for_each_entry(c, &s->se_conns, cn_persession) {
1633 if (c->cn_xprt == xpt) {
1634 return c;
1637 return NULL;
1640 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1642 struct nfs4_client *clp = ses->se_client;
1643 struct nfsd4_conn *c;
1644 int ret;
1646 spin_lock(&clp->cl_lock);
1647 c = __nfsd4_find_conn(new->cn_xprt, ses);
1648 if (c) {
1649 spin_unlock(&clp->cl_lock);
1650 free_conn(new);
1651 return;
1653 __nfsd4_hash_conn(new, ses);
1654 spin_unlock(&clp->cl_lock);
1655 ret = nfsd4_register_conn(new);
1656 if (ret)
1657 /* oops; xprt is already down: */
1658 nfsd4_conn_lost(&new->cn_xpt_user);
1659 return;
1662 __be32
1663 nfsd4_sequence(struct svc_rqst *rqstp,
1664 struct nfsd4_compound_state *cstate,
1665 struct nfsd4_sequence *seq)
1667 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1668 struct nfsd4_session *session;
1669 struct nfsd4_slot *slot;
1670 struct nfsd4_conn *conn;
1671 int status;
1673 if (resp->opcnt != 1)
1674 return nfserr_sequence_pos;
1677 * Will be either used or freed by nfsd4_sequence_check_conn
1678 * below.
1680 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1681 if (!conn)
1682 return nfserr_jukebox;
1684 spin_lock(&client_lock);
1685 status = nfserr_badsession;
1686 session = find_in_sessionid_hashtbl(&seq->sessionid);
1687 if (!session)
1688 goto out;
1690 status = nfserr_badslot;
1691 if (seq->slotid >= session->se_fchannel.maxreqs)
1692 goto out;
1694 slot = session->se_slots[seq->slotid];
1695 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1697 /* We do not negotiate the number of slots yet, so set the
1698 * maxslots to the session maxreqs which is used to encode
1699 * sr_highest_slotid and the sr_target_slot id to maxslots */
1700 seq->maxslots = session->se_fchannel.maxreqs;
1702 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
1703 if (status == nfserr_replay_cache) {
1704 cstate->slot = slot;
1705 cstate->session = session;
1706 /* Return the cached reply status and set cstate->status
1707 * for nfsd4_proc_compound processing */
1708 status = nfsd4_replay_cache_entry(resp, seq);
1709 cstate->status = nfserr_replay_cache;
1710 goto out;
1712 if (status)
1713 goto out;
1715 nfsd4_sequence_check_conn(conn, session);
1716 conn = NULL;
1718 /* Success! bump slot seqid */
1719 slot->sl_inuse = true;
1720 slot->sl_seqid = seq->seqid;
1721 slot->sl_cachethis = seq->cachethis;
1723 cstate->slot = slot;
1724 cstate->session = session;
1726 out:
1727 /* Hold a session reference until done processing the compound. */
1728 if (cstate->session) {
1729 nfsd4_get_session(cstate->session);
1730 atomic_inc(&session->se_client->cl_refcount);
1732 kfree(conn);
1733 spin_unlock(&client_lock);
1734 dprintk("%s: return %d\n", __func__, ntohl(status));
1735 return status;
1738 __be32
1739 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
1741 if (rc->rca_one_fs) {
1742 if (!cstate->current_fh.fh_dentry)
1743 return nfserr_nofilehandle;
1745 * We don't take advantage of the rca_one_fs case.
1746 * That's OK, it's optional, we can safely ignore it.
1748 return nfs_ok;
1750 nfs4_lock_state();
1751 if (is_client_expired(cstate->session->se_client)) {
1752 nfs4_unlock_state();
1754 * The following error isn't really legal.
1755 * But we only get here if the client just explicitly
1756 * destroyed the client. Surely it no longer cares what
1757 * error it gets back on an operation for the dead
1758 * client.
1760 return nfserr_stale_clientid;
1762 nfsd4_create_clid_dir(cstate->session->se_client);
1763 nfs4_unlock_state();
1764 return nfs_ok;
1767 __be32
1768 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1769 struct nfsd4_setclientid *setclid)
1771 struct sockaddr *sa = svc_addr(rqstp);
1772 struct xdr_netobj clname = {
1773 .len = setclid->se_namelen,
1774 .data = setclid->se_name,
1776 nfs4_verifier clverifier = setclid->se_verf;
1777 unsigned int strhashval;
1778 struct nfs4_client *conf, *unconf, *new;
1779 __be32 status;
1780 char dname[HEXDIR_LEN];
1782 if (!check_name(clname))
1783 return nfserr_inval;
1785 status = nfs4_make_rec_clidname(dname, &clname);
1786 if (status)
1787 return status;
1790 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1791 * We get here on a DRC miss.
1794 strhashval = clientstr_hashval(dname);
1796 nfs4_lock_state();
1797 conf = find_confirmed_client_by_str(dname, strhashval);
1798 if (conf) {
1799 /* RFC 3530 14.2.33 CASE 0: */
1800 status = nfserr_clid_inuse;
1801 if (clp_used_exchangeid(conf))
1802 goto out;
1803 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1804 char addr_str[INET6_ADDRSTRLEN];
1805 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
1806 sizeof(addr_str));
1807 dprintk("NFSD: setclientid: string in use by client "
1808 "at %s\n", addr_str);
1809 goto out;
1813 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1814 * has a description of SETCLIENTID request processing consisting
1815 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1817 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1818 status = nfserr_resource;
1819 if (!conf) {
1821 * RFC 3530 14.2.33 CASE 4:
1822 * placed first, because it is the normal case
1824 if (unconf)
1825 expire_client(unconf);
1826 new = create_client(clname, dname, rqstp, &clverifier);
1827 if (new == NULL)
1828 goto out;
1829 gen_clid(new);
1830 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1832 * RFC 3530 14.2.33 CASE 1:
1833 * probable callback update
1835 if (unconf) {
1836 /* Note this is removing unconfirmed {*x***},
1837 * which is stronger than RFC recommended {vxc**}.
1838 * This has the advantage that there is at most
1839 * one {*x***} in either list at any time.
1841 expire_client(unconf);
1843 new = create_client(clname, dname, rqstp, &clverifier);
1844 if (new == NULL)
1845 goto out;
1846 copy_clid(new, conf);
1847 } else if (!unconf) {
1849 * RFC 3530 14.2.33 CASE 2:
1850 * probable client reboot; state will be removed if
1851 * confirmed.
1853 new = create_client(clname, dname, rqstp, &clverifier);
1854 if (new == NULL)
1855 goto out;
1856 gen_clid(new);
1857 } else {
1859 * RFC 3530 14.2.33 CASE 3:
1860 * probable client reboot; state will be removed if
1861 * confirmed.
1863 expire_client(unconf);
1864 new = create_client(clname, dname, rqstp, &clverifier);
1865 if (new == NULL)
1866 goto out;
1867 gen_clid(new);
1870 * XXX: we should probably set this at creation time, and check
1871 * for consistent minorversion use throughout:
1873 new->cl_minorversion = 0;
1874 gen_callback(new, setclid, rpc_get_scope_id(sa));
1875 add_to_unconfirmed(new, strhashval);
1876 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1877 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1878 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1879 status = nfs_ok;
1880 out:
1881 nfs4_unlock_state();
1882 return status;
1887 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1888 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1889 * bullets, labeled as CASE1 - CASE4 below.
1891 __be32
1892 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1893 struct nfsd4_compound_state *cstate,
1894 struct nfsd4_setclientid_confirm *setclientid_confirm)
1896 struct sockaddr *sa = svc_addr(rqstp);
1897 struct nfs4_client *conf, *unconf;
1898 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1899 clientid_t * clid = &setclientid_confirm->sc_clientid;
1900 __be32 status;
1902 if (STALE_CLIENTID(clid))
1903 return nfserr_stale_clientid;
1905 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1906 * We get here on a DRC miss.
1909 nfs4_lock_state();
1911 conf = find_confirmed_client(clid);
1912 unconf = find_unconfirmed_client(clid);
1914 status = nfserr_clid_inuse;
1915 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
1916 goto out;
1917 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
1918 goto out;
1921 * section 14.2.34 of RFC 3530 has a description of
1922 * SETCLIENTID_CONFIRM request processing consisting
1923 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1925 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
1927 * RFC 3530 14.2.34 CASE 1:
1928 * callback update
1930 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1931 status = nfserr_clid_inuse;
1932 else {
1933 atomic_set(&conf->cl_cb_set, 0);
1934 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
1935 nfsd4_probe_callback(conf);
1936 expire_client(unconf);
1937 status = nfs_ok;
1940 } else if (conf && !unconf) {
1942 * RFC 3530 14.2.34 CASE 2:
1943 * probable retransmitted request; play it safe and
1944 * do nothing.
1946 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1947 status = nfserr_clid_inuse;
1948 else
1949 status = nfs_ok;
1950 } else if (!conf && unconf
1951 && same_verf(&unconf->cl_confirm, &confirm)) {
1953 * RFC 3530 14.2.34 CASE 3:
1954 * Normal case; new or rebooted client:
1956 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1957 status = nfserr_clid_inuse;
1958 } else {
1959 unsigned int hash =
1960 clientstr_hashval(unconf->cl_recdir);
1961 conf = find_confirmed_client_by_str(unconf->cl_recdir,
1962 hash);
1963 if (conf) {
1964 nfsd4_remove_clid_dir(conf);
1965 expire_client(conf);
1967 move_to_confirmed(unconf);
1968 conf = unconf;
1969 nfsd4_probe_callback(conf);
1970 status = nfs_ok;
1972 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1973 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
1974 &confirm)))) {
1976 * RFC 3530 14.2.34 CASE 4:
1977 * Client probably hasn't noticed that we rebooted yet.
1979 status = nfserr_stale_clientid;
1980 } else {
1981 /* check that we have hit one of the cases...*/
1982 status = nfserr_clid_inuse;
1984 out:
1985 nfs4_unlock_state();
1986 return status;
1989 /* OPEN Share state helper functions */
1990 static inline struct nfs4_file *
1991 alloc_init_file(struct inode *ino)
1993 struct nfs4_file *fp;
1994 unsigned int hashval = file_hashval(ino);
1996 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1997 if (fp) {
1998 atomic_set(&fp->fi_ref, 1);
1999 INIT_LIST_HEAD(&fp->fi_hash);
2000 INIT_LIST_HEAD(&fp->fi_stateids);
2001 INIT_LIST_HEAD(&fp->fi_delegations);
2002 fp->fi_inode = igrab(ino);
2003 fp->fi_id = current_fileid++;
2004 fp->fi_had_conflict = false;
2005 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2006 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2007 spin_lock(&recall_lock);
2008 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2009 spin_unlock(&recall_lock);
2010 return fp;
2012 return NULL;
2015 static void
2016 nfsd4_free_slab(struct kmem_cache **slab)
2018 if (*slab == NULL)
2019 return;
2020 kmem_cache_destroy(*slab);
2021 *slab = NULL;
2024 void
2025 nfsd4_free_slabs(void)
2027 nfsd4_free_slab(&stateowner_slab);
2028 nfsd4_free_slab(&file_slab);
2029 nfsd4_free_slab(&stateid_slab);
2030 nfsd4_free_slab(&deleg_slab);
2033 static int
2034 nfsd4_init_slabs(void)
2036 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
2037 sizeof(struct nfs4_stateowner), 0, 0, NULL);
2038 if (stateowner_slab == NULL)
2039 goto out_nomem;
2040 file_slab = kmem_cache_create("nfsd4_files",
2041 sizeof(struct nfs4_file), 0, 0, NULL);
2042 if (file_slab == NULL)
2043 goto out_nomem;
2044 stateid_slab = kmem_cache_create("nfsd4_stateids",
2045 sizeof(struct nfs4_stateid), 0, 0, NULL);
2046 if (stateid_slab == NULL)
2047 goto out_nomem;
2048 deleg_slab = kmem_cache_create("nfsd4_delegations",
2049 sizeof(struct nfs4_delegation), 0, 0, NULL);
2050 if (deleg_slab == NULL)
2051 goto out_nomem;
2052 return 0;
2053 out_nomem:
2054 nfsd4_free_slabs();
2055 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2056 return -ENOMEM;
2059 void
2060 nfs4_free_stateowner(struct kref *kref)
2062 struct nfs4_stateowner *sop =
2063 container_of(kref, struct nfs4_stateowner, so_ref);
2064 kfree(sop->so_owner.data);
2065 kmem_cache_free(stateowner_slab, sop);
2068 static inline struct nfs4_stateowner *
2069 alloc_stateowner(struct xdr_netobj *owner)
2071 struct nfs4_stateowner *sop;
2073 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
2074 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
2075 memcpy(sop->so_owner.data, owner->data, owner->len);
2076 sop->so_owner.len = owner->len;
2077 kref_init(&sop->so_ref);
2078 return sop;
2080 kmem_cache_free(stateowner_slab, sop);
2082 return NULL;
2085 static struct nfs4_stateowner *
2086 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2087 struct nfs4_stateowner *sop;
2088 struct nfs4_replay *rp;
2089 unsigned int idhashval;
2091 if (!(sop = alloc_stateowner(&open->op_owner)))
2092 return NULL;
2093 idhashval = ownerid_hashval(current_ownerid);
2094 INIT_LIST_HEAD(&sop->so_idhash);
2095 INIT_LIST_HEAD(&sop->so_strhash);
2096 INIT_LIST_HEAD(&sop->so_perclient);
2097 INIT_LIST_HEAD(&sop->so_stateids);
2098 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
2099 INIT_LIST_HEAD(&sop->so_close_lru);
2100 sop->so_time = 0;
2101 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
2102 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
2103 list_add(&sop->so_perclient, &clp->cl_openowners);
2104 sop->so_is_open_owner = 1;
2105 sop->so_id = current_ownerid++;
2106 sop->so_client = clp;
2107 sop->so_seqid = open->op_seqid;
2108 sop->so_confirmed = 0;
2109 rp = &sop->so_replay;
2110 rp->rp_status = nfserr_serverfault;
2111 rp->rp_buflen = 0;
2112 rp->rp_buf = rp->rp_ibuf;
2113 return sop;
2116 static inline void
2117 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2118 struct nfs4_stateowner *sop = open->op_stateowner;
2119 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2121 INIT_LIST_HEAD(&stp->st_hash);
2122 INIT_LIST_HEAD(&stp->st_perstateowner);
2123 INIT_LIST_HEAD(&stp->st_lockowners);
2124 INIT_LIST_HEAD(&stp->st_perfile);
2125 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
2126 list_add(&stp->st_perstateowner, &sop->so_stateids);
2127 list_add(&stp->st_perfile, &fp->fi_stateids);
2128 stp->st_stateowner = sop;
2129 get_nfs4_file(fp);
2130 stp->st_file = fp;
2131 stp->st_stateid.si_boot = boot_time;
2132 stp->st_stateid.si_stateownerid = sop->so_id;
2133 stp->st_stateid.si_fileid = fp->fi_id;
2134 stp->st_stateid.si_generation = 0;
2135 stp->st_access_bmap = 0;
2136 stp->st_deny_bmap = 0;
2137 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
2138 &stp->st_access_bmap);
2139 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2140 stp->st_openstp = NULL;
2143 static void
2144 move_to_close_lru(struct nfs4_stateowner *sop)
2146 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
2148 list_move_tail(&sop->so_close_lru, &close_lru);
2149 sop->so_time = get_seconds();
2152 static int
2153 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2154 clientid_t *clid)
2156 return (sop->so_owner.len == owner->len) &&
2157 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2158 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2161 static struct nfs4_stateowner *
2162 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2164 struct nfs4_stateowner *so = NULL;
2166 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2167 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
2168 return so;
2170 return NULL;
2173 /* search file_hashtbl[] for file */
2174 static struct nfs4_file *
2175 find_file(struct inode *ino)
2177 unsigned int hashval = file_hashval(ino);
2178 struct nfs4_file *fp;
2180 spin_lock(&recall_lock);
2181 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2182 if (fp->fi_inode == ino) {
2183 get_nfs4_file(fp);
2184 spin_unlock(&recall_lock);
2185 return fp;
2188 spin_unlock(&recall_lock);
2189 return NULL;
2192 static inline int access_valid(u32 x, u32 minorversion)
2194 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
2195 return 0;
2196 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
2197 return 0;
2198 x &= ~NFS4_SHARE_ACCESS_MASK;
2199 if (minorversion && x) {
2200 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
2201 return 0;
2202 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
2203 return 0;
2204 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
2206 if (x)
2207 return 0;
2208 return 1;
2211 static inline int deny_valid(u32 x)
2213 /* Note: unlike access bits, deny bits may be zero. */
2214 return x <= NFS4_SHARE_DENY_BOTH;
2218 * Called to check deny when READ with all zero stateid or
2219 * WRITE with all zero or all one stateid
2221 static __be32
2222 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2224 struct inode *ino = current_fh->fh_dentry->d_inode;
2225 struct nfs4_file *fp;
2226 struct nfs4_stateid *stp;
2227 __be32 ret;
2229 dprintk("NFSD: nfs4_share_conflict\n");
2231 fp = find_file(ino);
2232 if (!fp)
2233 return nfs_ok;
2234 ret = nfserr_locked;
2235 /* Search for conflicting share reservations */
2236 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2237 if (test_bit(deny_type, &stp->st_deny_bmap) ||
2238 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2239 goto out;
2241 ret = nfs_ok;
2242 out:
2243 put_nfs4_file(fp);
2244 return ret;
2247 static inline void
2248 nfs4_file_downgrade(struct nfs4_file *fp, unsigned int share_access)
2250 if (share_access & NFS4_SHARE_ACCESS_WRITE)
2251 nfs4_file_put_access(fp, O_WRONLY);
2252 if (share_access & NFS4_SHARE_ACCESS_READ)
2253 nfs4_file_put_access(fp, O_RDONLY);
2257 * Spawn a thread to perform a recall on the delegation represented
2258 * by the lease (file_lock)
2260 * Called from break_lease() with lock_flocks() held.
2261 * Note: we assume break_lease will only call this *once* for any given
2262 * lease.
2264 static
2265 void nfsd_break_deleg_cb(struct file_lock *fl)
2267 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2269 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2270 if (!dp)
2271 return;
2273 /* We're assuming the state code never drops its reference
2274 * without first removing the lease. Since we're in this lease
2275 * callback (and since the lease code is serialized by the kernel
2276 * lock) we know the server hasn't removed the lease yet, we know
2277 * it's safe to take a reference: */
2278 atomic_inc(&dp->dl_count);
2280 spin_lock(&recall_lock);
2281 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2282 spin_unlock(&recall_lock);
2284 /* only place dl_time is set. protected by lock_flocks*/
2285 dp->dl_time = get_seconds();
2288 * We don't want the locks code to timeout the lease for us;
2289 * we'll remove it ourself if the delegation isn't returned
2290 * in time.
2292 fl->fl_break_time = 0;
2294 dp->dl_file->fi_had_conflict = true;
2295 nfsd4_cb_recall(dp);
2298 static
2299 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2301 if (arg & F_UNLCK)
2302 return lease_modify(onlist, arg);
2303 else
2304 return -EAGAIN;
2307 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2308 .fl_break = nfsd_break_deleg_cb,
2309 .fl_change = nfsd_change_deleg_cb,
2313 __be32
2314 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2315 struct nfsd4_open *open)
2317 clientid_t *clientid = &open->op_clientid;
2318 struct nfs4_client *clp = NULL;
2319 unsigned int strhashval;
2320 struct nfs4_stateowner *sop = NULL;
2322 if (!check_name(open->op_owner))
2323 return nfserr_inval;
2325 if (STALE_CLIENTID(&open->op_clientid))
2326 return nfserr_stale_clientid;
2328 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2329 sop = find_openstateowner_str(strhashval, open);
2330 open->op_stateowner = sop;
2331 if (!sop) {
2332 /* Make sure the client's lease hasn't expired. */
2333 clp = find_confirmed_client(clientid);
2334 if (clp == NULL)
2335 return nfserr_expired;
2336 goto renew;
2338 /* When sessions are used, skip open sequenceid processing */
2339 if (nfsd4_has_session(cstate))
2340 goto renew;
2341 if (!sop->so_confirmed) {
2342 /* Replace unconfirmed owners without checking for replay. */
2343 clp = sop->so_client;
2344 release_openowner(sop);
2345 open->op_stateowner = NULL;
2346 goto renew;
2348 if (open->op_seqid == sop->so_seqid - 1) {
2349 if (sop->so_replay.rp_buflen)
2350 return nfserr_replay_me;
2351 /* The original OPEN failed so spectacularly
2352 * that we don't even have replay data saved!
2353 * Therefore, we have no choice but to continue
2354 * processing this OPEN; presumably, we'll
2355 * fail again for the same reason.
2357 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2358 goto renew;
2360 if (open->op_seqid != sop->so_seqid)
2361 return nfserr_bad_seqid;
2362 renew:
2363 if (open->op_stateowner == NULL) {
2364 sop = alloc_init_open_stateowner(strhashval, clp, open);
2365 if (sop == NULL)
2366 return nfserr_resource;
2367 open->op_stateowner = sop;
2369 list_del_init(&sop->so_close_lru);
2370 renew_client(sop->so_client);
2371 return nfs_ok;
2374 static inline __be32
2375 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2377 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2378 return nfserr_openmode;
2379 else
2380 return nfs_ok;
2383 static struct nfs4_delegation *
2384 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2386 struct nfs4_delegation *dp;
2388 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
2389 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2390 return dp;
2392 return NULL;
2395 int share_access_to_flags(u32 share_access)
2397 share_access &= ~NFS4_SHARE_WANT_MASK;
2399 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2402 static __be32
2403 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2404 struct nfs4_delegation **dp)
2406 int flags;
2407 __be32 status = nfserr_bad_stateid;
2409 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2410 if (*dp == NULL)
2411 goto out;
2412 flags = share_access_to_flags(open->op_share_access);
2413 status = nfs4_check_delegmode(*dp, flags);
2414 if (status)
2415 *dp = NULL;
2416 out:
2417 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2418 return nfs_ok;
2419 if (status)
2420 return status;
2421 open->op_stateowner->so_confirmed = 1;
2422 return nfs_ok;
2425 static __be32
2426 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2428 struct nfs4_stateid *local;
2429 __be32 status = nfserr_share_denied;
2430 struct nfs4_stateowner *sop = open->op_stateowner;
2432 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2433 /* ignore lock owners */
2434 if (local->st_stateowner->so_is_open_owner == 0)
2435 continue;
2436 /* remember if we have seen this open owner */
2437 if (local->st_stateowner == sop)
2438 *stpp = local;
2439 /* check for conflicting share reservations */
2440 if (!test_share(local, open))
2441 goto out;
2443 status = 0;
2444 out:
2445 return status;
2448 static inline struct nfs4_stateid *
2449 nfs4_alloc_stateid(void)
2451 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2454 static inline int nfs4_access_to_access(u32 nfs4_access)
2456 int flags = 0;
2458 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2459 flags |= NFSD_MAY_READ;
2460 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2461 flags |= NFSD_MAY_WRITE;
2462 return flags;
2465 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file
2466 *fp, struct svc_fh *cur_fh, u32 nfs4_access)
2468 __be32 status;
2469 int oflag = nfs4_access_to_omode(nfs4_access);
2470 int access = nfs4_access_to_access(nfs4_access);
2472 if (!fp->fi_fds[oflag]) {
2473 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2474 &fp->fi_fds[oflag]);
2475 if (status)
2476 return status;
2478 nfs4_file_get_access(fp, oflag);
2480 return nfs_ok;
2483 static __be32
2484 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
2485 struct nfs4_file *fp, struct svc_fh *cur_fh,
2486 struct nfsd4_open *open)
2488 struct nfs4_stateid *stp;
2489 __be32 status;
2491 stp = nfs4_alloc_stateid();
2492 if (stp == NULL)
2493 return nfserr_resource;
2495 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open->op_share_access);
2496 if (status) {
2497 kmem_cache_free(stateid_slab, stp);
2498 return status;
2500 *stpp = stp;
2501 return 0;
2504 static inline __be32
2505 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2506 struct nfsd4_open *open)
2508 struct iattr iattr = {
2509 .ia_valid = ATTR_SIZE,
2510 .ia_size = 0,
2512 if (!open->op_truncate)
2513 return 0;
2514 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2515 return nfserr_inval;
2516 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2519 static __be32
2520 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2522 u32 op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK;
2523 bool new_access;
2524 __be32 status;
2526 new_access = !test_bit(op_share_access, &stp->st_access_bmap);
2527 if (new_access) {
2528 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access);
2529 if (status)
2530 return status;
2532 status = nfsd4_truncate(rqstp, cur_fh, open);
2533 if (status) {
2534 if (new_access) {
2535 int oflag = nfs4_access_to_omode(new_access);
2536 nfs4_file_put_access(fp, oflag);
2538 return status;
2540 /* remember the open */
2541 __set_bit(op_share_access, &stp->st_access_bmap);
2542 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2544 return nfs_ok;
2548 static void
2549 nfs4_set_claim_prev(struct nfsd4_open *open)
2551 open->op_stateowner->so_confirmed = 1;
2552 open->op_stateowner->so_client->cl_firststate = 1;
2556 * Attempt to hand out a delegation.
2558 static void
2559 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2561 struct nfs4_delegation *dp;
2562 struct nfs4_stateowner *sop = stp->st_stateowner;
2563 int cb_up = atomic_read(&sop->so_client->cl_cb_set);
2564 struct file_lock *fl;
2565 int status, flag = 0;
2567 flag = NFS4_OPEN_DELEGATE_NONE;
2568 open->op_recall = 0;
2569 switch (open->op_claim_type) {
2570 case NFS4_OPEN_CLAIM_PREVIOUS:
2571 if (!cb_up)
2572 open->op_recall = 1;
2573 flag = open->op_delegate_type;
2574 if (flag == NFS4_OPEN_DELEGATE_NONE)
2575 goto out;
2576 break;
2577 case NFS4_OPEN_CLAIM_NULL:
2578 /* Let's not give out any delegations till everyone's
2579 * had the chance to reclaim theirs.... */
2580 if (locks_in_grace())
2581 goto out;
2582 if (!cb_up || !sop->so_confirmed)
2583 goto out;
2584 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2585 flag = NFS4_OPEN_DELEGATE_WRITE;
2586 else
2587 flag = NFS4_OPEN_DELEGATE_READ;
2588 break;
2589 default:
2590 goto out;
2593 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2594 if (dp == NULL) {
2595 flag = NFS4_OPEN_DELEGATE_NONE;
2596 goto out;
2598 status = -ENOMEM;
2599 fl = locks_alloc_lock();
2600 if (!fl)
2601 goto out;
2602 locks_init_lock(fl);
2603 fl->fl_lmops = &nfsd_lease_mng_ops;
2604 fl->fl_flags = FL_LEASE;
2605 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2606 fl->fl_end = OFFSET_MAX;
2607 fl->fl_owner = (fl_owner_t)dp;
2608 fl->fl_file = find_readable_file(stp->st_file);
2609 BUG_ON(!fl->fl_file);
2610 fl->fl_pid = current->tgid;
2611 dp->dl_flock = fl;
2613 /* vfs_setlease checks to see if delegation should be handed out.
2614 * the lock_manager callback fl_change is used
2616 if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) {
2617 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
2618 dp->dl_flock = NULL;
2619 locks_free_lock(fl);
2620 unhash_delegation(dp);
2621 flag = NFS4_OPEN_DELEGATE_NONE;
2622 goto out;
2625 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2627 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2628 STATEID_VAL(&dp->dl_stateid));
2629 out:
2630 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2631 && flag == NFS4_OPEN_DELEGATE_NONE
2632 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2633 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2634 open->op_delegate_type = flag;
2638 * called with nfs4_lock_state() held.
2640 __be32
2641 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2643 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2644 struct nfs4_file *fp = NULL;
2645 struct inode *ino = current_fh->fh_dentry->d_inode;
2646 struct nfs4_stateid *stp = NULL;
2647 struct nfs4_delegation *dp = NULL;
2648 __be32 status;
2650 status = nfserr_inval;
2651 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
2652 || !deny_valid(open->op_share_deny))
2653 goto out;
2655 * Lookup file; if found, lookup stateid and check open request,
2656 * and check for delegations in the process of being recalled.
2657 * If not found, create the nfs4_file struct
2659 fp = find_file(ino);
2660 if (fp) {
2661 if ((status = nfs4_check_open(fp, open, &stp)))
2662 goto out;
2663 status = nfs4_check_deleg(fp, open, &dp);
2664 if (status)
2665 goto out;
2666 } else {
2667 status = nfserr_bad_stateid;
2668 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2669 goto out;
2670 status = nfserr_resource;
2671 fp = alloc_init_file(ino);
2672 if (fp == NULL)
2673 goto out;
2677 * OPEN the file, or upgrade an existing OPEN.
2678 * If truncate fails, the OPEN fails.
2680 if (stp) {
2681 /* Stateid was found, this is an OPEN upgrade */
2682 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
2683 if (status)
2684 goto out;
2685 update_stateid(&stp->st_stateid);
2686 } else {
2687 status = nfs4_new_open(rqstp, &stp, fp, current_fh, open);
2688 if (status)
2689 goto out;
2690 init_stateid(stp, fp, open);
2691 status = nfsd4_truncate(rqstp, current_fh, open);
2692 if (status) {
2693 release_open_stateid(stp);
2694 goto out;
2696 if (nfsd4_has_session(&resp->cstate))
2697 update_stateid(&stp->st_stateid);
2699 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2701 if (nfsd4_has_session(&resp->cstate))
2702 open->op_stateowner->so_confirmed = 1;
2705 * Attempt to hand out a delegation. No error return, because the
2706 * OPEN succeeds even if we fail.
2708 nfs4_open_delegation(current_fh, open, stp);
2710 status = nfs_ok;
2712 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
2713 STATEID_VAL(&stp->st_stateid));
2714 out:
2715 if (fp)
2716 put_nfs4_file(fp);
2717 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2718 nfs4_set_claim_prev(open);
2720 * To finish the open response, we just need to set the rflags.
2722 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2723 if (!open->op_stateowner->so_confirmed &&
2724 !nfsd4_has_session(&resp->cstate))
2725 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2727 return status;
2730 __be32
2731 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2732 clientid_t *clid)
2734 struct nfs4_client *clp;
2735 __be32 status;
2737 nfs4_lock_state();
2738 dprintk("process_renew(%08x/%08x): starting\n",
2739 clid->cl_boot, clid->cl_id);
2740 status = nfserr_stale_clientid;
2741 if (STALE_CLIENTID(clid))
2742 goto out;
2743 clp = find_confirmed_client(clid);
2744 status = nfserr_expired;
2745 if (clp == NULL) {
2746 /* We assume the client took too long to RENEW. */
2747 dprintk("nfsd4_renew: clientid not found!\n");
2748 goto out;
2750 renew_client(clp);
2751 status = nfserr_cb_path_down;
2752 if (!list_empty(&clp->cl_delegations)
2753 && !atomic_read(&clp->cl_cb_set))
2754 goto out;
2755 status = nfs_ok;
2756 out:
2757 nfs4_unlock_state();
2758 return status;
2761 struct lock_manager nfsd4_manager = {
2764 static void
2765 nfsd4_end_grace(void)
2767 dprintk("NFSD: end of grace period\n");
2768 nfsd4_recdir_purge_old();
2769 locks_end_grace(&nfsd4_manager);
2771 * Now that every NFSv4 client has had the chance to recover and
2772 * to see the (possibly new, possibly shorter) lease time, we
2773 * can safely set the next grace time to the current lease time:
2775 nfsd4_grace = nfsd4_lease;
2778 static time_t
2779 nfs4_laundromat(void)
2781 struct nfs4_client *clp;
2782 struct nfs4_stateowner *sop;
2783 struct nfs4_delegation *dp;
2784 struct list_head *pos, *next, reaplist;
2785 time_t cutoff = get_seconds() - nfsd4_lease;
2786 time_t t, clientid_val = nfsd4_lease;
2787 time_t u, test_val = nfsd4_lease;
2789 nfs4_lock_state();
2791 dprintk("NFSD: laundromat service - starting\n");
2792 if (locks_in_grace())
2793 nfsd4_end_grace();
2794 INIT_LIST_HEAD(&reaplist);
2795 spin_lock(&client_lock);
2796 list_for_each_safe(pos, next, &client_lru) {
2797 clp = list_entry(pos, struct nfs4_client, cl_lru);
2798 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2799 t = clp->cl_time - cutoff;
2800 if (clientid_val > t)
2801 clientid_val = t;
2802 break;
2804 if (atomic_read(&clp->cl_refcount)) {
2805 dprintk("NFSD: client in use (clientid %08x)\n",
2806 clp->cl_clientid.cl_id);
2807 continue;
2809 unhash_client_locked(clp);
2810 list_add(&clp->cl_lru, &reaplist);
2812 spin_unlock(&client_lock);
2813 list_for_each_safe(pos, next, &reaplist) {
2814 clp = list_entry(pos, struct nfs4_client, cl_lru);
2815 dprintk("NFSD: purging unused client (clientid %08x)\n",
2816 clp->cl_clientid.cl_id);
2817 nfsd4_remove_clid_dir(clp);
2818 expire_client(clp);
2820 spin_lock(&recall_lock);
2821 list_for_each_safe(pos, next, &del_recall_lru) {
2822 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2823 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2824 u = dp->dl_time - cutoff;
2825 if (test_val > u)
2826 test_val = u;
2827 break;
2829 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2830 dp, dp->dl_flock);
2831 list_move(&dp->dl_recall_lru, &reaplist);
2833 spin_unlock(&recall_lock);
2834 list_for_each_safe(pos, next, &reaplist) {
2835 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2836 list_del_init(&dp->dl_recall_lru);
2837 unhash_delegation(dp);
2839 test_val = nfsd4_lease;
2840 list_for_each_safe(pos, next, &close_lru) {
2841 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2842 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2843 u = sop->so_time - cutoff;
2844 if (test_val > u)
2845 test_val = u;
2846 break;
2848 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2849 sop->so_id);
2850 release_openowner(sop);
2852 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2853 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2854 nfs4_unlock_state();
2855 return clientid_val;
2858 static struct workqueue_struct *laundry_wq;
2859 static void laundromat_main(struct work_struct *);
2860 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2862 static void
2863 laundromat_main(struct work_struct *not_used)
2865 time_t t;
2867 t = nfs4_laundromat();
2868 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
2869 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
2872 static struct nfs4_stateowner *
2873 search_close_lru(u32 st_id, int flags)
2875 struct nfs4_stateowner *local = NULL;
2877 if (flags & CLOSE_STATE) {
2878 list_for_each_entry(local, &close_lru, so_close_lru) {
2879 if (local->so_id == st_id)
2880 return local;
2883 return NULL;
2886 static inline int
2887 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2889 return fhp->fh_dentry->d_inode != stp->st_file->fi_inode;
2892 static int
2893 STALE_STATEID(stateid_t *stateid)
2895 if (stateid->si_boot == boot_time)
2896 return 0;
2897 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
2898 STATEID_VAL(stateid));
2899 return 1;
2902 static inline int
2903 access_permit_read(unsigned long access_bmap)
2905 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2906 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2907 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2910 static inline int
2911 access_permit_write(unsigned long access_bmap)
2913 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2914 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2917 static
2918 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2920 __be32 status = nfserr_openmode;
2922 /* For lock stateid's, we test the parent open, not the lock: */
2923 if (stp->st_openstp)
2924 stp = stp->st_openstp;
2925 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2926 goto out;
2927 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2928 goto out;
2929 status = nfs_ok;
2930 out:
2931 return status;
2934 static inline __be32
2935 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2937 if (ONE_STATEID(stateid) && (flags & RD_STATE))
2938 return nfs_ok;
2939 else if (locks_in_grace()) {
2940 /* Answer in remaining cases depends on existance of
2941 * conflicting state; so we must wait out the grace period. */
2942 return nfserr_grace;
2943 } else if (flags & WR_STATE)
2944 return nfs4_share_conflict(current_fh,
2945 NFS4_SHARE_DENY_WRITE);
2946 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2947 return nfs4_share_conflict(current_fh,
2948 NFS4_SHARE_DENY_READ);
2952 * Allow READ/WRITE during grace period on recovered state only for files
2953 * that are not able to provide mandatory locking.
2955 static inline int
2956 grace_disallows_io(struct inode *inode)
2958 return locks_in_grace() && mandatory_lock(inode);
2961 static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
2964 * When sessions are used the stateid generation number is ignored
2965 * when it is zero.
2967 if ((flags & HAS_SESSION) && in->si_generation == 0)
2968 goto out;
2970 /* If the client sends us a stateid from the future, it's buggy: */
2971 if (in->si_generation > ref->si_generation)
2972 return nfserr_bad_stateid;
2974 * The following, however, can happen. For example, if the
2975 * client sends an open and some IO at the same time, the open
2976 * may bump si_generation while the IO is still in flight.
2977 * Thanks to hard links and renames, the client never knows what
2978 * file an open will affect. So it could avoid that situation
2979 * only by serializing all opens and IO from the same open
2980 * owner. To recover from the old_stateid error, the client
2981 * will just have to retry the IO:
2983 if (in->si_generation < ref->si_generation)
2984 return nfserr_old_stateid;
2985 out:
2986 return nfs_ok;
2989 static int is_delegation_stateid(stateid_t *stateid)
2991 return stateid->si_fileid == 0;
2995 * Checks for stateid operations
2997 __be32
2998 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
2999 stateid_t *stateid, int flags, struct file **filpp)
3001 struct nfs4_stateid *stp = NULL;
3002 struct nfs4_delegation *dp = NULL;
3003 struct svc_fh *current_fh = &cstate->current_fh;
3004 struct inode *ino = current_fh->fh_dentry->d_inode;
3005 __be32 status;
3007 if (filpp)
3008 *filpp = NULL;
3010 if (grace_disallows_io(ino))
3011 return nfserr_grace;
3013 if (nfsd4_has_session(cstate))
3014 flags |= HAS_SESSION;
3016 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3017 return check_special_stateids(current_fh, stateid, flags);
3019 status = nfserr_stale_stateid;
3020 if (STALE_STATEID(stateid))
3021 goto out;
3024 * We assume that any stateid that has the current boot time,
3025 * but that we can't find, is expired:
3027 status = nfserr_expired;
3028 if (is_delegation_stateid(stateid)) {
3029 dp = find_delegation_stateid(ino, stateid);
3030 if (!dp)
3031 goto out;
3032 status = check_stateid_generation(stateid, &dp->dl_stateid,
3033 flags);
3034 if (status)
3035 goto out;
3036 status = nfs4_check_delegmode(dp, flags);
3037 if (status)
3038 goto out;
3039 renew_client(dp->dl_client);
3040 if (filpp) {
3041 *filpp = find_readable_file(dp->dl_file);
3042 BUG_ON(!*filpp);
3044 } else { /* open or lock stateid */
3045 stp = find_stateid(stateid, flags);
3046 if (!stp)
3047 goto out;
3048 status = nfserr_bad_stateid;
3049 if (nfs4_check_fh(current_fh, stp))
3050 goto out;
3051 if (!stp->st_stateowner->so_confirmed)
3052 goto out;
3053 status = check_stateid_generation(stateid, &stp->st_stateid,
3054 flags);
3055 if (status)
3056 goto out;
3057 status = nfs4_check_openmode(stp, flags);
3058 if (status)
3059 goto out;
3060 renew_client(stp->st_stateowner->so_client);
3061 if (filpp) {
3062 if (flags & RD_STATE)
3063 *filpp = find_readable_file(stp->st_file);
3064 else
3065 *filpp = find_writeable_file(stp->st_file);
3068 status = nfs_ok;
3069 out:
3070 return status;
3073 static inline int
3074 setlkflg (int type)
3076 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3077 RD_STATE : WR_STATE;
3081 * Checks for sequence id mutating operations.
3083 static __be32
3084 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3085 stateid_t *stateid, int flags,
3086 struct nfs4_stateowner **sopp,
3087 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
3089 struct nfs4_stateid *stp;
3090 struct nfs4_stateowner *sop;
3091 struct svc_fh *current_fh = &cstate->current_fh;
3092 __be32 status;
3094 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3095 seqid, STATEID_VAL(stateid));
3097 *stpp = NULL;
3098 *sopp = NULL;
3100 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
3101 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3102 return nfserr_bad_stateid;
3105 if (STALE_STATEID(stateid))
3106 return nfserr_stale_stateid;
3108 if (nfsd4_has_session(cstate))
3109 flags |= HAS_SESSION;
3112 * We return BAD_STATEID if filehandle doesn't match stateid,
3113 * the confirmed flag is incorrecly set, or the generation
3114 * number is incorrect.
3116 stp = find_stateid(stateid, flags);
3117 if (stp == NULL) {
3119 * Also, we should make sure this isn't just the result of
3120 * a replayed close:
3122 sop = search_close_lru(stateid->si_stateownerid, flags);
3123 /* It's not stale; let's assume it's expired: */
3124 if (sop == NULL)
3125 return nfserr_expired;
3126 *sopp = sop;
3127 goto check_replay;
3130 *stpp = stp;
3131 *sopp = sop = stp->st_stateowner;
3133 if (lock) {
3134 clientid_t *lockclid = &lock->v.new.clientid;
3135 struct nfs4_client *clp = sop->so_client;
3136 int lkflg = 0;
3137 __be32 status;
3139 lkflg = setlkflg(lock->lk_type);
3141 if (lock->lk_is_new) {
3142 if (!sop->so_is_open_owner)
3143 return nfserr_bad_stateid;
3144 if (!(flags & HAS_SESSION) &&
3145 !same_clid(&clp->cl_clientid, lockclid))
3146 return nfserr_bad_stateid;
3147 /* stp is the open stateid */
3148 status = nfs4_check_openmode(stp, lkflg);
3149 if (status)
3150 return status;
3151 } else {
3152 /* stp is the lock stateid */
3153 status = nfs4_check_openmode(stp->st_openstp, lkflg);
3154 if (status)
3155 return status;
3159 if (nfs4_check_fh(current_fh, stp)) {
3160 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3161 return nfserr_bad_stateid;
3165 * We now validate the seqid and stateid generation numbers.
3166 * For the moment, we ignore the possibility of
3167 * generation number wraparound.
3169 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
3170 goto check_replay;
3172 if (sop->so_confirmed && flags & CONFIRM) {
3173 dprintk("NFSD: preprocess_seqid_op: expected"
3174 " unconfirmed stateowner!\n");
3175 return nfserr_bad_stateid;
3177 if (!sop->so_confirmed && !(flags & CONFIRM)) {
3178 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3179 " confirmed yet!\n");
3180 return nfserr_bad_stateid;
3182 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
3183 if (status)
3184 return status;
3185 renew_client(sop->so_client);
3186 return nfs_ok;
3188 check_replay:
3189 if (seqid == sop->so_seqid - 1) {
3190 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
3191 /* indicate replay to calling function */
3192 return nfserr_replay_me;
3194 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3195 sop->so_seqid, seqid);
3196 *sopp = NULL;
3197 return nfserr_bad_seqid;
3200 __be32
3201 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3202 struct nfsd4_open_confirm *oc)
3204 __be32 status;
3205 struct nfs4_stateowner *sop;
3206 struct nfs4_stateid *stp;
3208 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3209 (int)cstate->current_fh.fh_dentry->d_name.len,
3210 cstate->current_fh.fh_dentry->d_name.name);
3212 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3213 if (status)
3214 return status;
3216 nfs4_lock_state();
3218 if ((status = nfs4_preprocess_seqid_op(cstate,
3219 oc->oc_seqid, &oc->oc_req_stateid,
3220 CONFIRM | OPEN_STATE,
3221 &oc->oc_stateowner, &stp, NULL)))
3222 goto out;
3224 sop = oc->oc_stateowner;
3225 sop->so_confirmed = 1;
3226 update_stateid(&stp->st_stateid);
3227 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3228 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3229 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid));
3231 nfsd4_create_clid_dir(sop->so_client);
3232 out:
3233 if (oc->oc_stateowner) {
3234 nfs4_get_stateowner(oc->oc_stateowner);
3235 cstate->replay_owner = oc->oc_stateowner;
3237 nfs4_unlock_state();
3238 return status;
3243 * unset all bits in union bitmap (bmap) that
3244 * do not exist in share (from successful OPEN_DOWNGRADE)
3246 static void
3247 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3249 int i;
3250 for (i = 1; i < 4; i++) {
3251 if ((i & access) != i)
3252 __clear_bit(i, bmap);
3256 static void
3257 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3259 int i;
3260 for (i = 0; i < 4; i++) {
3261 if ((i & deny) != i)
3262 __clear_bit(i, bmap);
3266 __be32
3267 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3268 struct nfsd4_compound_state *cstate,
3269 struct nfsd4_open_downgrade *od)
3271 __be32 status;
3272 struct nfs4_stateid *stp;
3273 unsigned int share_access;
3275 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3276 (int)cstate->current_fh.fh_dentry->d_name.len,
3277 cstate->current_fh.fh_dentry->d_name.name);
3279 if (!access_valid(od->od_share_access, cstate->minorversion)
3280 || !deny_valid(od->od_share_deny))
3281 return nfserr_inval;
3283 nfs4_lock_state();
3284 if ((status = nfs4_preprocess_seqid_op(cstate,
3285 od->od_seqid,
3286 &od->od_stateid,
3287 OPEN_STATE,
3288 &od->od_stateowner, &stp, NULL)))
3289 goto out;
3291 status = nfserr_inval;
3292 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3293 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3294 stp->st_access_bmap, od->od_share_access);
3295 goto out;
3297 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3298 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3299 stp->st_deny_bmap, od->od_share_deny);
3300 goto out;
3302 set_access(&share_access, stp->st_access_bmap);
3303 nfs4_file_downgrade(stp->st_file, share_access & ~od->od_share_access);
3305 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3306 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3308 update_stateid(&stp->st_stateid);
3309 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3310 status = nfs_ok;
3311 out:
3312 if (od->od_stateowner) {
3313 nfs4_get_stateowner(od->od_stateowner);
3314 cstate->replay_owner = od->od_stateowner;
3316 nfs4_unlock_state();
3317 return status;
3321 * nfs4_unlock_state() called after encode
3323 __be32
3324 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3325 struct nfsd4_close *close)
3327 __be32 status;
3328 struct nfs4_stateid *stp;
3330 dprintk("NFSD: nfsd4_close on file %.*s\n",
3331 (int)cstate->current_fh.fh_dentry->d_name.len,
3332 cstate->current_fh.fh_dentry->d_name.name);
3334 nfs4_lock_state();
3335 /* check close_lru for replay */
3336 if ((status = nfs4_preprocess_seqid_op(cstate,
3337 close->cl_seqid,
3338 &close->cl_stateid,
3339 OPEN_STATE | CLOSE_STATE,
3340 &close->cl_stateowner, &stp, NULL)))
3341 goto out;
3342 status = nfs_ok;
3343 update_stateid(&stp->st_stateid);
3344 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3346 /* release_stateid() calls nfsd_close() if needed */
3347 release_open_stateid(stp);
3349 /* place unused nfs4_stateowners on so_close_lru list to be
3350 * released by the laundromat service after the lease period
3351 * to enable us to handle CLOSE replay
3353 if (list_empty(&close->cl_stateowner->so_stateids))
3354 move_to_close_lru(close->cl_stateowner);
3355 out:
3356 if (close->cl_stateowner) {
3357 nfs4_get_stateowner(close->cl_stateowner);
3358 cstate->replay_owner = close->cl_stateowner;
3360 nfs4_unlock_state();
3361 return status;
3364 __be32
3365 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3366 struct nfsd4_delegreturn *dr)
3368 struct nfs4_delegation *dp;
3369 stateid_t *stateid = &dr->dr_stateid;
3370 struct inode *inode;
3371 __be32 status;
3372 int flags = 0;
3374 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3375 return status;
3376 inode = cstate->current_fh.fh_dentry->d_inode;
3378 if (nfsd4_has_session(cstate))
3379 flags |= HAS_SESSION;
3380 nfs4_lock_state();
3381 status = nfserr_bad_stateid;
3382 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3383 goto out;
3384 status = nfserr_stale_stateid;
3385 if (STALE_STATEID(stateid))
3386 goto out;
3387 status = nfserr_bad_stateid;
3388 if (!is_delegation_stateid(stateid))
3389 goto out;
3390 status = nfserr_expired;
3391 dp = find_delegation_stateid(inode, stateid);
3392 if (!dp)
3393 goto out;
3394 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
3395 if (status)
3396 goto out;
3397 renew_client(dp->dl_client);
3399 unhash_delegation(dp);
3400 out:
3401 nfs4_unlock_state();
3403 return status;
3408 * Lock owner state (byte-range locks)
3410 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3411 #define LOCK_HASH_BITS 8
3412 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3413 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3415 static inline u64
3416 end_offset(u64 start, u64 len)
3418 u64 end;
3420 end = start + len;
3421 return end >= start ? end: NFS4_MAX_UINT64;
3424 /* last octet in a range */
3425 static inline u64
3426 last_byte_offset(u64 start, u64 len)
3428 u64 end;
3430 BUG_ON(!len);
3431 end = start + len;
3432 return end > start ? end - 1: NFS4_MAX_UINT64;
3435 #define lockownerid_hashval(id) \
3436 ((id) & LOCK_HASH_MASK)
3438 static inline unsigned int
3439 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3440 struct xdr_netobj *ownername)
3442 return (file_hashval(inode) + cl_id
3443 + opaque_hashval(ownername->data, ownername->len))
3444 & LOCK_HASH_MASK;
3447 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3448 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3449 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3451 static struct nfs4_stateid *
3452 find_stateid(stateid_t *stid, int flags)
3454 struct nfs4_stateid *local;
3455 u32 st_id = stid->si_stateownerid;
3456 u32 f_id = stid->si_fileid;
3457 unsigned int hashval;
3459 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
3460 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
3461 hashval = stateid_hashval(st_id, f_id);
3462 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3463 if ((local->st_stateid.si_stateownerid == st_id) &&
3464 (local->st_stateid.si_fileid == f_id))
3465 return local;
3469 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
3470 hashval = stateid_hashval(st_id, f_id);
3471 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3472 if ((local->st_stateid.si_stateownerid == st_id) &&
3473 (local->st_stateid.si_fileid == f_id))
3474 return local;
3477 return NULL;
3480 static struct nfs4_delegation *
3481 find_delegation_stateid(struct inode *ino, stateid_t *stid)
3483 struct nfs4_file *fp;
3484 struct nfs4_delegation *dl;
3486 dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__,
3487 STATEID_VAL(stid));
3489 fp = find_file(ino);
3490 if (!fp)
3491 return NULL;
3492 dl = find_delegation_file(fp, stid);
3493 put_nfs4_file(fp);
3494 return dl;
3498 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3499 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3500 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3501 * locking, this prevents us from being completely protocol-compliant. The
3502 * real solution to this problem is to start using unsigned file offsets in
3503 * the VFS, but this is a very deep change!
3505 static inline void
3506 nfs4_transform_lock_offset(struct file_lock *lock)
3508 if (lock->fl_start < 0)
3509 lock->fl_start = OFFSET_MAX;
3510 if (lock->fl_end < 0)
3511 lock->fl_end = OFFSET_MAX;
3514 /* Hack!: For now, we're defining this just so we can use a pointer to it
3515 * as a unique cookie to identify our (NFSv4's) posix locks. */
3516 static const struct lock_manager_operations nfsd_posix_mng_ops = {
3519 static inline void
3520 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3522 struct nfs4_stateowner *sop;
3524 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3525 sop = (struct nfs4_stateowner *) fl->fl_owner;
3526 kref_get(&sop->so_ref);
3527 deny->ld_sop = sop;
3528 deny->ld_clientid = sop->so_client->cl_clientid;
3529 } else {
3530 deny->ld_sop = NULL;
3531 deny->ld_clientid.cl_boot = 0;
3532 deny->ld_clientid.cl_id = 0;
3534 deny->ld_start = fl->fl_start;
3535 deny->ld_length = NFS4_MAX_UINT64;
3536 if (fl->fl_end != NFS4_MAX_UINT64)
3537 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3538 deny->ld_type = NFS4_READ_LT;
3539 if (fl->fl_type != F_RDLCK)
3540 deny->ld_type = NFS4_WRITE_LT;
3543 static struct nfs4_stateowner *
3544 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3545 struct xdr_netobj *owner)
3547 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3548 struct nfs4_stateowner *op;
3550 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
3551 if (same_owner_str(op, owner, clid))
3552 return op;
3554 return NULL;
3558 * Alloc a lock owner structure.
3559 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3560 * occured.
3562 * strhashval = lock_ownerstr_hashval
3565 static struct nfs4_stateowner *
3566 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3567 struct nfs4_stateowner *sop;
3568 struct nfs4_replay *rp;
3569 unsigned int idhashval;
3571 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3572 return NULL;
3573 idhashval = lockownerid_hashval(current_ownerid);
3574 INIT_LIST_HEAD(&sop->so_idhash);
3575 INIT_LIST_HEAD(&sop->so_strhash);
3576 INIT_LIST_HEAD(&sop->so_perclient);
3577 INIT_LIST_HEAD(&sop->so_stateids);
3578 INIT_LIST_HEAD(&sop->so_perstateid);
3579 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3580 sop->so_time = 0;
3581 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3582 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
3583 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
3584 sop->so_is_open_owner = 0;
3585 sop->so_id = current_ownerid++;
3586 sop->so_client = clp;
3587 /* It is the openowner seqid that will be incremented in encode in the
3588 * case of new lockowners; so increment the lock seqid manually: */
3589 sop->so_seqid = lock->lk_new_lock_seqid + 1;
3590 sop->so_confirmed = 1;
3591 rp = &sop->so_replay;
3592 rp->rp_status = nfserr_serverfault;
3593 rp->rp_buflen = 0;
3594 rp->rp_buf = rp->rp_ibuf;
3595 return sop;
3598 static struct nfs4_stateid *
3599 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3601 struct nfs4_stateid *stp;
3602 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3604 stp = nfs4_alloc_stateid();
3605 if (stp == NULL)
3606 goto out;
3607 INIT_LIST_HEAD(&stp->st_hash);
3608 INIT_LIST_HEAD(&stp->st_perfile);
3609 INIT_LIST_HEAD(&stp->st_perstateowner);
3610 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
3611 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
3612 list_add(&stp->st_perfile, &fp->fi_stateids);
3613 list_add(&stp->st_perstateowner, &sop->so_stateids);
3614 stp->st_stateowner = sop;
3615 get_nfs4_file(fp);
3616 stp->st_file = fp;
3617 stp->st_stateid.si_boot = boot_time;
3618 stp->st_stateid.si_stateownerid = sop->so_id;
3619 stp->st_stateid.si_fileid = fp->fi_id;
3620 stp->st_stateid.si_generation = 0;
3621 stp->st_deny_bmap = open_stp->st_deny_bmap;
3622 stp->st_openstp = open_stp;
3624 out:
3625 return stp;
3628 static int
3629 check_lock_length(u64 offset, u64 length)
3631 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
3632 LOFF_OVERFLOW(offset, length)));
3636 * LOCK operation
3638 __be32
3639 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3640 struct nfsd4_lock *lock)
3642 struct nfs4_stateowner *open_sop = NULL;
3643 struct nfs4_stateowner *lock_sop = NULL;
3644 struct nfs4_stateid *lock_stp;
3645 struct nfs4_file *fp;
3646 struct file *filp = NULL;
3647 struct file_lock file_lock;
3648 struct file_lock conflock;
3649 __be32 status = 0;
3650 unsigned int strhashval;
3651 unsigned int cmd;
3652 int err;
3654 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3655 (long long) lock->lk_offset,
3656 (long long) lock->lk_length);
3658 if (check_lock_length(lock->lk_offset, lock->lk_length))
3659 return nfserr_inval;
3661 if ((status = fh_verify(rqstp, &cstate->current_fh,
3662 S_IFREG, NFSD_MAY_LOCK))) {
3663 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3664 return status;
3667 nfs4_lock_state();
3669 if (lock->lk_is_new) {
3671 * Client indicates that this is a new lockowner.
3672 * Use open owner and open stateid to create lock owner and
3673 * lock stateid.
3675 struct nfs4_stateid *open_stp = NULL;
3677 status = nfserr_stale_clientid;
3678 if (!nfsd4_has_session(cstate) &&
3679 STALE_CLIENTID(&lock->lk_new_clientid))
3680 goto out;
3682 /* validate and update open stateid and open seqid */
3683 status = nfs4_preprocess_seqid_op(cstate,
3684 lock->lk_new_open_seqid,
3685 &lock->lk_new_open_stateid,
3686 OPEN_STATE,
3687 &lock->lk_replay_owner, &open_stp,
3688 lock);
3689 if (status)
3690 goto out;
3691 open_sop = lock->lk_replay_owner;
3692 /* create lockowner and lock stateid */
3693 fp = open_stp->st_file;
3694 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3695 open_sop->so_client->cl_clientid.cl_id,
3696 &lock->v.new.owner);
3697 /* XXX: Do we need to check for duplicate stateowners on
3698 * the same file, or should they just be allowed (and
3699 * create new stateids)? */
3700 status = nfserr_resource;
3701 lock_sop = alloc_init_lock_stateowner(strhashval,
3702 open_sop->so_client, open_stp, lock);
3703 if (lock_sop == NULL)
3704 goto out;
3705 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
3706 if (lock_stp == NULL)
3707 goto out;
3708 } else {
3709 /* lock (lock owner + lock stateid) already exists */
3710 status = nfs4_preprocess_seqid_op(cstate,
3711 lock->lk_old_lock_seqid,
3712 &lock->lk_old_lock_stateid,
3713 LOCK_STATE,
3714 &lock->lk_replay_owner, &lock_stp, lock);
3715 if (status)
3716 goto out;
3717 lock_sop = lock->lk_replay_owner;
3718 fp = lock_stp->st_file;
3720 /* lock->lk_replay_owner and lock_stp have been created or found */
3722 status = nfserr_grace;
3723 if (locks_in_grace() && !lock->lk_reclaim)
3724 goto out;
3725 status = nfserr_no_grace;
3726 if (!locks_in_grace() && lock->lk_reclaim)
3727 goto out;
3729 locks_init_lock(&file_lock);
3730 switch (lock->lk_type) {
3731 case NFS4_READ_LT:
3732 case NFS4_READW_LT:
3733 if (find_readable_file(lock_stp->st_file)) {
3734 nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_READ);
3735 filp = find_readable_file(lock_stp->st_file);
3737 file_lock.fl_type = F_RDLCK;
3738 cmd = F_SETLK;
3739 break;
3740 case NFS4_WRITE_LT:
3741 case NFS4_WRITEW_LT:
3742 if (find_writeable_file(lock_stp->st_file)) {
3743 nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_WRITE);
3744 filp = find_writeable_file(lock_stp->st_file);
3746 file_lock.fl_type = F_WRLCK;
3747 cmd = F_SETLK;
3748 break;
3749 default:
3750 status = nfserr_inval;
3751 goto out;
3753 if (!filp) {
3754 status = nfserr_openmode;
3755 goto out;
3757 file_lock.fl_owner = (fl_owner_t)lock_sop;
3758 file_lock.fl_pid = current->tgid;
3759 file_lock.fl_file = filp;
3760 file_lock.fl_flags = FL_POSIX;
3761 file_lock.fl_lmops = &nfsd_posix_mng_ops;
3763 file_lock.fl_start = lock->lk_offset;
3764 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
3765 nfs4_transform_lock_offset(&file_lock);
3768 * Try to lock the file in the VFS.
3769 * Note: locks.c uses the BKL to protect the inode's lock list.
3772 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
3773 switch (-err) {
3774 case 0: /* success! */
3775 update_stateid(&lock_stp->st_stateid);
3776 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3777 sizeof(stateid_t));
3778 status = 0;
3779 break;
3780 case (EAGAIN): /* conflock holds conflicting lock */
3781 status = nfserr_denied;
3782 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3783 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3784 break;
3785 case (EDEADLK):
3786 status = nfserr_deadlock;
3787 break;
3788 default:
3789 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
3790 status = nfserr_resource;
3791 break;
3793 out:
3794 if (status && lock->lk_is_new && lock_sop)
3795 release_lockowner(lock_sop);
3796 if (lock->lk_replay_owner) {
3797 nfs4_get_stateowner(lock->lk_replay_owner);
3798 cstate->replay_owner = lock->lk_replay_owner;
3800 nfs4_unlock_state();
3801 return status;
3805 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3806 * so we do a temporary open here just to get an open file to pass to
3807 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3808 * inode operation.)
3810 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3812 struct file *file;
3813 int err;
3815 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3816 if (err)
3817 return err;
3818 err = vfs_test_lock(file, lock);
3819 nfsd_close(file);
3820 return err;
3824 * LOCKT operation
3826 __be32
3827 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3828 struct nfsd4_lockt *lockt)
3830 struct inode *inode;
3831 struct file_lock file_lock;
3832 int error;
3833 __be32 status;
3835 if (locks_in_grace())
3836 return nfserr_grace;
3838 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3839 return nfserr_inval;
3841 lockt->lt_stateowner = NULL;
3842 nfs4_lock_state();
3844 status = nfserr_stale_clientid;
3845 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
3846 goto out;
3848 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
3849 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
3850 if (status == nfserr_symlink)
3851 status = nfserr_inval;
3852 goto out;
3855 inode = cstate->current_fh.fh_dentry->d_inode;
3856 locks_init_lock(&file_lock);
3857 switch (lockt->lt_type) {
3858 case NFS4_READ_LT:
3859 case NFS4_READW_LT:
3860 file_lock.fl_type = F_RDLCK;
3861 break;
3862 case NFS4_WRITE_LT:
3863 case NFS4_WRITEW_LT:
3864 file_lock.fl_type = F_WRLCK;
3865 break;
3866 default:
3867 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
3868 status = nfserr_inval;
3869 goto out;
3872 lockt->lt_stateowner = find_lockstateowner_str(inode,
3873 &lockt->lt_clientid, &lockt->lt_owner);
3874 if (lockt->lt_stateowner)
3875 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3876 file_lock.fl_pid = current->tgid;
3877 file_lock.fl_flags = FL_POSIX;
3879 file_lock.fl_start = lockt->lt_offset;
3880 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
3882 nfs4_transform_lock_offset(&file_lock);
3884 status = nfs_ok;
3885 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
3886 if (error) {
3887 status = nfserrno(error);
3888 goto out;
3890 if (file_lock.fl_type != F_UNLCK) {
3891 status = nfserr_denied;
3892 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
3894 out:
3895 nfs4_unlock_state();
3896 return status;
3899 __be32
3900 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3901 struct nfsd4_locku *locku)
3903 struct nfs4_stateid *stp;
3904 struct file *filp = NULL;
3905 struct file_lock file_lock;
3906 __be32 status;
3907 int err;
3909 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3910 (long long) locku->lu_offset,
3911 (long long) locku->lu_length);
3913 if (check_lock_length(locku->lu_offset, locku->lu_length))
3914 return nfserr_inval;
3916 nfs4_lock_state();
3918 if ((status = nfs4_preprocess_seqid_op(cstate,
3919 locku->lu_seqid,
3920 &locku->lu_stateid,
3921 LOCK_STATE,
3922 &locku->lu_stateowner, &stp, NULL)))
3923 goto out;
3925 filp = find_any_file(stp->st_file);
3926 if (!filp) {
3927 status = nfserr_lock_range;
3928 goto out;
3930 BUG_ON(!filp);
3931 locks_init_lock(&file_lock);
3932 file_lock.fl_type = F_UNLCK;
3933 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3934 file_lock.fl_pid = current->tgid;
3935 file_lock.fl_file = filp;
3936 file_lock.fl_flags = FL_POSIX;
3937 file_lock.fl_lmops = &nfsd_posix_mng_ops;
3938 file_lock.fl_start = locku->lu_offset;
3940 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
3941 nfs4_transform_lock_offset(&file_lock);
3944 * Try to unlock the file in the VFS.
3946 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
3947 if (err) {
3948 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
3949 goto out_nfserr;
3952 * OK, unlock succeeded; the only thing left to do is update the stateid.
3954 update_stateid(&stp->st_stateid);
3955 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3957 out:
3958 if (locku->lu_stateowner) {
3959 nfs4_get_stateowner(locku->lu_stateowner);
3960 cstate->replay_owner = locku->lu_stateowner;
3962 nfs4_unlock_state();
3963 return status;
3965 out_nfserr:
3966 status = nfserrno(err);
3967 goto out;
3971 * returns
3972 * 1: locks held by lockowner
3973 * 0: no locks held by lockowner
3975 static int
3976 check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner)
3978 struct file_lock **flpp;
3979 struct inode *inode = filp->fi_inode;
3980 int status = 0;
3982 lock_flocks();
3983 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3984 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
3985 status = 1;
3986 goto out;
3989 out:
3990 unlock_flocks();
3991 return status;
3994 __be32
3995 nfsd4_release_lockowner(struct svc_rqst *rqstp,
3996 struct nfsd4_compound_state *cstate,
3997 struct nfsd4_release_lockowner *rlockowner)
3999 clientid_t *clid = &rlockowner->rl_clientid;
4000 struct nfs4_stateowner *sop;
4001 struct nfs4_stateid *stp;
4002 struct xdr_netobj *owner = &rlockowner->rl_owner;
4003 struct list_head matches;
4004 int i;
4005 __be32 status;
4007 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4008 clid->cl_boot, clid->cl_id);
4010 /* XXX check for lease expiration */
4012 status = nfserr_stale_clientid;
4013 if (STALE_CLIENTID(clid))
4014 return status;
4016 nfs4_lock_state();
4018 status = nfserr_locks_held;
4019 /* XXX: we're doing a linear search through all the lockowners.
4020 * Yipes! For now we'll just hope clients aren't really using
4021 * release_lockowner much, but eventually we have to fix these
4022 * data structures. */
4023 INIT_LIST_HEAD(&matches);
4024 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4025 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
4026 if (!same_owner_str(sop, owner, clid))
4027 continue;
4028 list_for_each_entry(stp, &sop->so_stateids,
4029 st_perstateowner) {
4030 if (check_for_locks(stp->st_file, sop))
4031 goto out;
4032 /* Note: so_perclient unused for lockowners,
4033 * so it's OK to fool with here. */
4034 list_add(&sop->so_perclient, &matches);
4038 /* Clients probably won't expect us to return with some (but not all)
4039 * of the lockowner state released; so don't release any until all
4040 * have been checked. */
4041 status = nfs_ok;
4042 while (!list_empty(&matches)) {
4043 sop = list_entry(matches.next, struct nfs4_stateowner,
4044 so_perclient);
4045 /* unhash_stateowner deletes so_perclient only
4046 * for openowners. */
4047 list_del(&sop->so_perclient);
4048 release_lockowner(sop);
4050 out:
4051 nfs4_unlock_state();
4052 return status;
4055 static inline struct nfs4_client_reclaim *
4056 alloc_reclaim(void)
4058 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4062 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
4064 unsigned int strhashval = clientstr_hashval(name);
4065 struct nfs4_client *clp;
4067 clp = find_confirmed_client_by_str(name, strhashval);
4068 return clp ? 1 : 0;
4072 * failure => all reset bets are off, nfserr_no_grace...
4075 nfs4_client_to_reclaim(const char *name)
4077 unsigned int strhashval;
4078 struct nfs4_client_reclaim *crp = NULL;
4080 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4081 crp = alloc_reclaim();
4082 if (!crp)
4083 return 0;
4084 strhashval = clientstr_hashval(name);
4085 INIT_LIST_HEAD(&crp->cr_strhash);
4086 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4087 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4088 reclaim_str_hashtbl_size++;
4089 return 1;
4092 static void
4093 nfs4_release_reclaim(void)
4095 struct nfs4_client_reclaim *crp = NULL;
4096 int i;
4098 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4099 while (!list_empty(&reclaim_str_hashtbl[i])) {
4100 crp = list_entry(reclaim_str_hashtbl[i].next,
4101 struct nfs4_client_reclaim, cr_strhash);
4102 list_del(&crp->cr_strhash);
4103 kfree(crp);
4104 reclaim_str_hashtbl_size--;
4107 BUG_ON(reclaim_str_hashtbl_size);
4111 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4112 static struct nfs4_client_reclaim *
4113 nfs4_find_reclaim_client(clientid_t *clid)
4115 unsigned int strhashval;
4116 struct nfs4_client *clp;
4117 struct nfs4_client_reclaim *crp = NULL;
4120 /* find clientid in conf_id_hashtbl */
4121 clp = find_confirmed_client(clid);
4122 if (clp == NULL)
4123 return NULL;
4125 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4126 clp->cl_name.len, clp->cl_name.data,
4127 clp->cl_recdir);
4129 /* find clp->cl_name in reclaim_str_hashtbl */
4130 strhashval = clientstr_hashval(clp->cl_recdir);
4131 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4132 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
4133 return crp;
4136 return NULL;
4140 * Called from OPEN. Look for clientid in reclaim list.
4142 __be32
4143 nfs4_check_open_reclaim(clientid_t *clid)
4145 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
4148 /* initialization to perform at module load time: */
4151 nfs4_state_init(void)
4153 int i, status;
4155 status = nfsd4_init_slabs();
4156 if (status)
4157 return status;
4158 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4159 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4160 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4161 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4162 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4163 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4165 for (i = 0; i < SESSION_HASH_SIZE; i++)
4166 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4167 for (i = 0; i < FILE_HASH_SIZE; i++) {
4168 INIT_LIST_HEAD(&file_hashtbl[i]);
4170 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4171 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4172 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
4174 for (i = 0; i < STATEID_HASH_SIZE; i++) {
4175 INIT_LIST_HEAD(&stateid_hashtbl[i]);
4176 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
4178 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4179 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
4180 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4182 memset(&onestateid, ~0, sizeof(stateid_t));
4183 INIT_LIST_HEAD(&close_lru);
4184 INIT_LIST_HEAD(&client_lru);
4185 INIT_LIST_HEAD(&del_recall_lru);
4186 reclaim_str_hashtbl_size = 0;
4187 return 0;
4190 static void
4191 nfsd4_load_reboot_recovery_data(void)
4193 int status;
4195 nfs4_lock_state();
4196 nfsd4_init_recdir(user_recovery_dirname);
4197 status = nfsd4_recdir_load();
4198 nfs4_unlock_state();
4199 if (status)
4200 printk("NFSD: Failure reading reboot recovery data\n");
4204 * Since the lifetime of a delegation isn't limited to that of an open, a
4205 * client may quite reasonably hang on to a delegation as long as it has
4206 * the inode cached. This becomes an obvious problem the first time a
4207 * client's inode cache approaches the size of the server's total memory.
4209 * For now we avoid this problem by imposing a hard limit on the number
4210 * of delegations, which varies according to the server's memory size.
4212 static void
4213 set_max_delegations(void)
4216 * Allow at most 4 delegations per megabyte of RAM. Quick
4217 * estimates suggest that in the worst case (where every delegation
4218 * is for a different inode), a delegation could take about 1.5K,
4219 * giving a worst case usage of about 6% of memory.
4221 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4224 /* initialization to perform when the nfsd service is started: */
4226 static int
4227 __nfs4_state_start(void)
4229 int ret;
4231 boot_time = get_seconds();
4232 locks_start_grace(&nfsd4_manager);
4233 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4234 nfsd4_grace);
4235 ret = set_callback_cred();
4236 if (ret)
4237 return -ENOMEM;
4238 laundry_wq = create_singlethread_workqueue("nfsd4");
4239 if (laundry_wq == NULL)
4240 return -ENOMEM;
4241 ret = nfsd4_create_callback_queue();
4242 if (ret)
4243 goto out_free_laundry;
4244 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4245 set_max_delegations();
4246 return 0;
4247 out_free_laundry:
4248 destroy_workqueue(laundry_wq);
4249 return ret;
4253 nfs4_state_start(void)
4255 nfsd4_load_reboot_recovery_data();
4256 return __nfs4_state_start();
4259 static void
4260 __nfs4_state_shutdown(void)
4262 int i;
4263 struct nfs4_client *clp = NULL;
4264 struct nfs4_delegation *dp = NULL;
4265 struct list_head *pos, *next, reaplist;
4267 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4268 while (!list_empty(&conf_id_hashtbl[i])) {
4269 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4270 expire_client(clp);
4272 while (!list_empty(&unconf_str_hashtbl[i])) {
4273 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4274 expire_client(clp);
4277 INIT_LIST_HEAD(&reaplist);
4278 spin_lock(&recall_lock);
4279 list_for_each_safe(pos, next, &del_recall_lru) {
4280 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4281 list_move(&dp->dl_recall_lru, &reaplist);
4283 spin_unlock(&recall_lock);
4284 list_for_each_safe(pos, next, &reaplist) {
4285 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4286 list_del_init(&dp->dl_recall_lru);
4287 unhash_delegation(dp);
4290 nfsd4_shutdown_recdir();
4293 void
4294 nfs4_state_shutdown(void)
4296 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4297 destroy_workqueue(laundry_wq);
4298 locks_end_grace(&nfsd4_manager);
4299 nfs4_lock_state();
4300 nfs4_release_reclaim();
4301 __nfs4_state_shutdown();
4302 nfs4_unlock_state();
4303 nfsd4_destroy_callback_queue();
4307 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4308 * accessed when nfsd is starting.
4310 static void
4311 nfs4_set_recdir(char *recdir)
4313 strcpy(user_recovery_dirname, recdir);
4317 * Change the NFSv4 recovery directory to recdir.
4320 nfs4_reset_recoverydir(char *recdir)
4322 int status;
4323 struct path path;
4325 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
4326 if (status)
4327 return status;
4328 status = -ENOTDIR;
4329 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
4330 nfs4_set_recdir(recdir);
4331 status = 0;
4333 path_put(&path);
4334 return status;
4337 char *
4338 nfs4_recoverydir(void)
4340 return user_recovery_dirname;