2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/sunrpc/svcauth_gss.h>
42 #include <linux/sunrpc/clnt.h>
46 #define NFSDDBG_FACILITY NFSDDBG_PROC
49 time_t nfsd4_lease = 90; /* default lease time */
50 time_t nfsd4_grace = 90;
51 static time_t boot_time;
52 static stateid_t zerostateid; /* bits all 0 */
53 static stateid_t onestateid; /* bits all 1 */
54 static u64 current_sessionid = 1;
56 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
57 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
59 /* forward declarations */
60 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
64 /* Currently used for almost all code touching nfsv4 state: */
65 static DEFINE_MUTEX(client_mutex);
68 * Currently used for the del_recall_lru and file hash table. In an
69 * effort to decrease the scope of the client_mutex, this spinlock may
70 * eventually cover more:
72 static DEFINE_SPINLOCK(recall_lock);
74 static struct kmem_cache *openowner_slab = NULL;
75 static struct kmem_cache *lockowner_slab = NULL;
76 static struct kmem_cache *file_slab = NULL;
77 static struct kmem_cache *stateid_slab = NULL;
78 static struct kmem_cache *deleg_slab = NULL;
83 mutex_lock(&client_mutex);
87 nfs4_unlock_state(void)
89 mutex_unlock(&client_mutex);
93 opaque_hashval(const void *ptr, int nbytes)
95 unsigned char *cptr = (unsigned char *) ptr;
105 static struct list_head del_recall_lru;
107 static void nfsd4_free_file(struct nfs4_file *f)
109 kmem_cache_free(file_slab, f);
113 put_nfs4_file(struct nfs4_file *fi)
115 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
116 list_del(&fi->fi_hash);
117 spin_unlock(&recall_lock);
124 get_nfs4_file(struct nfs4_file *fi)
126 atomic_inc(&fi->fi_ref);
129 static int num_delegations;
130 unsigned int max_delegations;
133 * Open owner state (share locks)
136 /* hash tables for open owners */
137 #define OPEN_OWNER_HASH_BITS 8
138 #define OPEN_OWNER_HASH_SIZE (1 << OPEN_OWNER_HASH_BITS)
139 #define OPEN_OWNER_HASH_MASK (OPEN_OWNER_HASH_SIZE - 1)
141 static unsigned int open_ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
145 ret = opaque_hashval(ownername->data, ownername->len);
147 return ret & OPEN_OWNER_HASH_MASK;
150 static struct list_head open_ownerstr_hashtbl[OPEN_OWNER_HASH_SIZE];
152 /* hash table for nfs4_file */
153 #define FILE_HASH_BITS 8
154 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
156 static unsigned int file_hashval(struct inode *ino)
158 /* XXX: why are we hashing on inode pointer, anyway? */
159 return hash_ptr(ino, FILE_HASH_BITS);
162 static struct list_head file_hashtbl[FILE_HASH_SIZE];
164 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
166 BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
167 atomic_inc(&fp->fi_access[oflag]);
170 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
172 if (oflag == O_RDWR) {
173 __nfs4_file_get_access(fp, O_RDONLY);
174 __nfs4_file_get_access(fp, O_WRONLY);
176 __nfs4_file_get_access(fp, oflag);
179 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
181 if (fp->fi_fds[oflag]) {
182 fput(fp->fi_fds[oflag]);
183 fp->fi_fds[oflag] = NULL;
187 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
189 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
190 nfs4_file_put_fd(fp, oflag);
191 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
192 nfs4_file_put_fd(fp, O_RDWR);
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);
202 __nfs4_file_put_access(fp, oflag);
205 static inline int get_new_stid(struct nfs4_stid *stid)
207 static int min_stateid = 0;
208 struct idr *stateids = &stid->sc_client->cl_stateids;
212 error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
214 * Note: the necessary preallocation was done in
215 * nfs4_alloc_stateid(). The idr code caps the number of
216 * preallocations that can exist at a time, but the state lock
217 * prevents anyone from using ours before we get here:
221 * It shouldn't be a problem to reuse an opaque stateid value.
222 * I don't think it is for 4.1. But with 4.0 I worry that, for
223 * example, a stray write retransmission could be accepted by
224 * the server when it should have been rejected. Therefore,
225 * adopt a trick from the sctp code to attempt to maximize the
226 * amount of time until an id is reused, by ensuring they always
227 * "increase" (mod INT_MAX):
230 min_stateid = new_stid+1;
231 if (min_stateid == INT_MAX)
236 static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
238 stateid_t *s = &stid->sc_stateid;
241 stid->sc_type = type;
242 stid->sc_client = cl;
243 s->si_opaque.so_clid = cl->cl_clientid;
244 new_id = get_new_stid(stid);
245 s->si_opaque.so_id = (u32)new_id;
246 /* Will be incremented before return to client: */
247 s->si_generation = 0;
250 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
252 struct idr *stateids = &cl->cl_stateids;
254 if (!idr_pre_get(stateids, GFP_KERNEL))
257 * Note: if we fail here (or any time between now and the time
258 * we actually get the new idr), we won't need to undo the idr
259 * preallocation, since the idr code caps the number of
260 * preallocated entries.
262 return kmem_cache_alloc(slab, GFP_KERNEL);
265 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
267 return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
270 static struct nfs4_delegation *
271 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
273 struct nfs4_delegation *dp;
274 struct nfs4_file *fp = stp->st_file;
276 dprintk("NFSD alloc_init_deleg\n");
278 * Major work on the lease subsystem (for example, to support
279 * calbacks on stat) will be required before we can support
280 * write delegations properly.
282 if (type != NFS4_OPEN_DELEGATE_READ)
284 if (fp->fi_had_conflict)
286 if (num_delegations > max_delegations)
288 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
291 init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
293 * delegation seqid's are never incremented. The 4.1 special
294 * meaning of seqid 0 isn't meaningful, really, but let's avoid
295 * 0 anyway just for consistency and use 1:
297 dp->dl_stid.sc_stateid.si_generation = 1;
299 INIT_LIST_HEAD(&dp->dl_perfile);
300 INIT_LIST_HEAD(&dp->dl_perclnt);
301 INIT_LIST_HEAD(&dp->dl_recall_lru);
305 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
307 atomic_set(&dp->dl_count, 1);
308 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
313 nfs4_put_delegation(struct nfs4_delegation *dp)
315 if (atomic_dec_and_test(&dp->dl_count)) {
316 dprintk("NFSD: freeing dp %p\n",dp);
317 put_nfs4_file(dp->dl_file);
318 kmem_cache_free(deleg_slab, dp);
323 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
325 if (atomic_dec_and_test(&fp->fi_delegees)) {
326 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
328 fput(fp->fi_deleg_file);
329 fp->fi_deleg_file = NULL;
333 static void unhash_stid(struct nfs4_stid *s)
335 struct idr *stateids = &s->sc_client->cl_stateids;
337 idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
340 /* Called under the state lock. */
342 unhash_delegation(struct nfs4_delegation *dp)
344 unhash_stid(&dp->dl_stid);
345 list_del_init(&dp->dl_perclnt);
346 spin_lock(&recall_lock);
347 list_del_init(&dp->dl_perfile);
348 list_del_init(&dp->dl_recall_lru);
349 spin_unlock(&recall_lock);
350 nfs4_put_deleg_lease(dp->dl_file);
351 nfs4_put_delegation(dp);
358 /* client_lock protects the client lru list and session hash table */
359 static DEFINE_SPINLOCK(client_lock);
361 /* Hash tables for nfs4_clientid state */
362 #define CLIENT_HASH_BITS 4
363 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
364 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
366 static unsigned int clientid_hashval(u32 id)
368 return id & CLIENT_HASH_MASK;
371 static unsigned int clientstr_hashval(const char *name)
373 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
377 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
378 * used in reboot/reset lease grace period processing
380 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
381 * setclientid_confirmed info.
383 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
386 * client_lru holds client queue ordered by nfs4_client.cl_time
389 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
390 * for last close replay.
392 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
393 static int reclaim_str_hashtbl_size = 0;
394 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
395 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
396 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
397 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
398 static struct list_head client_lru;
399 static struct list_head close_lru;
402 * We store the NONE, READ, WRITE, and BOTH bits separately in the
403 * st_{access,deny}_bmap field of the stateid, in order to track not
404 * only what share bits are currently in force, but also what
405 * combinations of share bits previous opens have used. This allows us
406 * to enforce the recommendation of rfc 3530 14.2.19 that the server
407 * return an error if the client attempt to downgrade to a combination
408 * of share bits not explicable by closing some of its previous opens.
410 * XXX: This enforcement is actually incomplete, since we don't keep
411 * track of access/deny bit combinations; so, e.g., we allow:
413 * OPEN allow read, deny write
414 * OPEN allow both, deny none
415 * DOWNGRADE allow read, deny none
417 * which we should reject.
420 set_access(unsigned int *access, unsigned long bmap) {
424 for (i = 1; i < 4; i++) {
425 if (test_bit(i, &bmap))
431 set_deny(unsigned int *deny, unsigned long bmap) {
435 for (i = 0; i < 4; i++) {
436 if (test_bit(i, &bmap))
442 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
443 unsigned int access, deny;
445 set_access(&access, stp->st_access_bmap);
446 set_deny(&deny, stp->st_deny_bmap);
447 if ((access & open->op_share_deny) || (deny & open->op_share_access))
452 static int nfs4_access_to_omode(u32 access)
454 switch (access & NFS4_SHARE_ACCESS_BOTH) {
455 case NFS4_SHARE_ACCESS_READ:
457 case NFS4_SHARE_ACCESS_WRITE:
459 case NFS4_SHARE_ACCESS_BOTH:
465 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
467 list_del(&stp->st_perfile);
468 list_del(&stp->st_perstateowner);
471 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
475 if (stp->st_access_bmap) {
476 for (i = 1; i < 4; i++) {
477 if (test_bit(i, &stp->st_access_bmap))
478 nfs4_file_put_access(stp->st_file,
479 nfs4_access_to_omode(i));
480 __clear_bit(i, &stp->st_access_bmap);
483 put_nfs4_file(stp->st_file);
487 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
489 kmem_cache_free(stateid_slab, stp);
492 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
496 unhash_generic_stateid(stp);
497 unhash_stid(&stp->st_stid);
498 file = find_any_file(stp->st_file);
500 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
501 close_generic_stateid(stp);
502 free_generic_stateid(stp);
505 static void unhash_lockowner(struct nfs4_lockowner *lo)
507 struct nfs4_ol_stateid *stp;
509 list_del(&lo->lo_owner.so_strhash);
510 list_del(&lo->lo_perstateid);
511 while (!list_empty(&lo->lo_owner.so_stateids)) {
512 stp = list_first_entry(&lo->lo_owner.so_stateids,
513 struct nfs4_ol_stateid, st_perstateowner);
514 release_lock_stateid(stp);
518 static void release_lockowner(struct nfs4_lockowner *lo)
520 unhash_lockowner(lo);
521 nfs4_free_lockowner(lo);
525 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
527 struct nfs4_lockowner *lo;
529 while (!list_empty(&open_stp->st_lockowners)) {
530 lo = list_entry(open_stp->st_lockowners.next,
531 struct nfs4_lockowner, lo_perstateid);
532 release_lockowner(lo);
536 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
538 unhash_generic_stateid(stp);
539 release_stateid_lockowners(stp);
540 close_generic_stateid(stp);
543 static void release_open_stateid(struct nfs4_ol_stateid *stp)
545 unhash_open_stateid(stp);
546 unhash_stid(&stp->st_stid);
547 free_generic_stateid(stp);
550 static void unhash_openowner(struct nfs4_openowner *oo)
552 struct nfs4_ol_stateid *stp;
554 list_del(&oo->oo_owner.so_strhash);
555 list_del(&oo->oo_perclient);
556 while (!list_empty(&oo->oo_owner.so_stateids)) {
557 stp = list_first_entry(&oo->oo_owner.so_stateids,
558 struct nfs4_ol_stateid, st_perstateowner);
559 release_open_stateid(stp);
563 static void release_last_closed_stateid(struct nfs4_openowner *oo)
565 struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
568 unhash_stid(&s->st_stid);
569 free_generic_stateid(s);
570 oo->oo_last_closed_stid = NULL;
574 static void release_openowner(struct nfs4_openowner *oo)
576 unhash_openowner(oo);
577 list_del(&oo->oo_close_lru);
578 release_last_closed_stateid(oo);
579 nfs4_free_openowner(oo);
582 #define SESSION_HASH_SIZE 512
583 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
586 hash_sessionid(struct nfs4_sessionid *sessionid)
588 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
590 return sid->sequence % SESSION_HASH_SIZE;
594 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
596 u32 *ptr = (u32 *)(&sessionid->data[0]);
597 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
601 gen_sessionid(struct nfsd4_session *ses)
603 struct nfs4_client *clp = ses->se_client;
604 struct nfsd4_sessionid *sid;
606 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
607 sid->clientid = clp->cl_clientid;
608 sid->sequence = current_sessionid++;
613 * The protocol defines ca_maxresponssize_cached to include the size of
614 * the rpc header, but all we need to cache is the data starting after
615 * the end of the initial SEQUENCE operation--the rest we regenerate
616 * each time. Therefore we can advertise a ca_maxresponssize_cached
617 * value that is the number of bytes in our cache plus a few additional
618 * bytes. In order to stay on the safe side, and not promise more than
619 * we can cache, those additional bytes must be the minimum possible: 24
620 * bytes of rpc header (xid through accept state, with AUTH_NULL
621 * verifier), 12 for the compound header (with zero-length tag), and 44
622 * for the SEQUENCE op response:
624 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
627 free_session_slots(struct nfsd4_session *ses)
631 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
632 kfree(ses->se_slots[i]);
636 * We don't actually need to cache the rpc and session headers, so we
637 * can allocate a little less for each slot:
639 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
641 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
644 static int nfsd4_sanitize_slot_size(u32 size)
646 size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
647 size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
653 * XXX: If we run out of reserved DRC memory we could (up to a point)
654 * re-negotiate active sessions and reduce their slot usage to make
655 * rooom for new connections. For now we just fail the create session.
657 static int nfsd4_get_drc_mem(int slotsize, u32 num)
661 num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
663 spin_lock(&nfsd_drc_lock);
664 avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
665 nfsd_drc_max_mem - nfsd_drc_mem_used);
666 num = min_t(int, num, avail / slotsize);
667 nfsd_drc_mem_used += num * slotsize;
668 spin_unlock(&nfsd_drc_lock);
673 static void nfsd4_put_drc_mem(int slotsize, int num)
675 spin_lock(&nfsd_drc_lock);
676 nfsd_drc_mem_used -= slotsize * num;
677 spin_unlock(&nfsd_drc_lock);
680 static struct nfsd4_session *alloc_session(int slotsize, int numslots)
682 struct nfsd4_session *new;
685 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
686 + sizeof(struct nfsd4_session) > PAGE_SIZE);
687 mem = numslots * sizeof(struct nfsd4_slot *);
689 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
692 /* allocate each struct nfsd4_slot and data cache in one piece */
693 for (i = 0; i < numslots; i++) {
694 mem = sizeof(struct nfsd4_slot) + slotsize;
695 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
696 if (!new->se_slots[i])
702 kfree(new->se_slots[i]);
707 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
709 u32 maxrpc = nfsd_serv->sv_max_mesg;
711 new->maxreqs = numslots;
712 new->maxresp_cached = min_t(u32, req->maxresp_cached,
713 slotsize + NFSD_MIN_HDR_SEQ_SZ);
714 new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
715 new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
716 new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
719 static void free_conn(struct nfsd4_conn *c)
721 svc_xprt_put(c->cn_xprt);
725 static void nfsd4_conn_lost(struct svc_xpt_user *u)
727 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
728 struct nfs4_client *clp = c->cn_session->se_client;
730 spin_lock(&clp->cl_lock);
731 if (!list_empty(&c->cn_persession)) {
732 list_del(&c->cn_persession);
735 spin_unlock(&clp->cl_lock);
736 nfsd4_probe_callback(clp);
739 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
741 struct nfsd4_conn *conn;
743 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
746 svc_xprt_get(rqstp->rq_xprt);
747 conn->cn_xprt = rqstp->rq_xprt;
748 conn->cn_flags = flags;
749 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
753 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
755 conn->cn_session = ses;
756 list_add(&conn->cn_persession, &ses->se_conns);
759 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
761 struct nfs4_client *clp = ses->se_client;
763 spin_lock(&clp->cl_lock);
764 __nfsd4_hash_conn(conn, ses);
765 spin_unlock(&clp->cl_lock);
768 static int nfsd4_register_conn(struct nfsd4_conn *conn)
770 conn->cn_xpt_user.callback = nfsd4_conn_lost;
771 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
774 static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses, u32 dir)
776 struct nfsd4_conn *conn;
779 conn = alloc_conn(rqstp, dir);
781 return nfserr_jukebox;
782 nfsd4_hash_conn(conn, ses);
783 ret = nfsd4_register_conn(conn);
785 /* oops; xprt is already down: */
786 nfsd4_conn_lost(&conn->cn_xpt_user);
790 static __be32 nfsd4_new_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_session *ses)
792 u32 dir = NFS4_CDFC4_FORE;
794 if (ses->se_flags & SESSION4_BACK_CHAN)
795 dir |= NFS4_CDFC4_BACK;
797 return nfsd4_new_conn(rqstp, ses, dir);
800 /* must be called under client_lock */
801 static void nfsd4_del_conns(struct nfsd4_session *s)
803 struct nfs4_client *clp = s->se_client;
804 struct nfsd4_conn *c;
806 spin_lock(&clp->cl_lock);
807 while (!list_empty(&s->se_conns)) {
808 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
809 list_del_init(&c->cn_persession);
810 spin_unlock(&clp->cl_lock);
812 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
815 spin_lock(&clp->cl_lock);
817 spin_unlock(&clp->cl_lock);
820 void free_session(struct kref *kref)
822 struct nfsd4_session *ses;
825 ses = container_of(kref, struct nfsd4_session, se_ref);
826 nfsd4_del_conns(ses);
827 spin_lock(&nfsd_drc_lock);
828 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
829 nfsd_drc_mem_used -= mem;
830 spin_unlock(&nfsd_drc_lock);
831 free_session_slots(ses);
835 static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
837 struct nfsd4_session *new;
838 struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
839 int numslots, slotsize;
844 * Note decreasing slot size below client's request may
845 * make it difficult for client to function correctly, whereas
846 * decreasing the number of slots will (just?) affect
847 * performance. When short on memory we therefore prefer to
848 * decrease number of slots instead of their size.
850 slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
851 numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
855 new = alloc_session(slotsize, numslots);
857 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
860 init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
862 new->se_client = clp;
865 INIT_LIST_HEAD(&new->se_conns);
867 new->se_cb_seq_nr = 1;
868 new->se_flags = cses->flags;
869 new->se_cb_prog = cses->callback_prog;
870 kref_init(&new->se_ref);
871 idx = hash_sessionid(&new->se_sessionid);
872 spin_lock(&client_lock);
873 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
874 spin_lock(&clp->cl_lock);
875 list_add(&new->se_perclnt, &clp->cl_sessions);
876 spin_unlock(&clp->cl_lock);
877 spin_unlock(&client_lock);
879 status = nfsd4_new_conn_from_crses(rqstp, new);
880 /* whoops: benny points out, status is ignored! (err, or bogus) */
882 free_session(&new->se_ref);
885 if (cses->flags & SESSION4_BACK_CHAN) {
886 struct sockaddr *sa = svc_addr(rqstp);
888 * This is a little silly; with sessions there's no real
889 * use for the callback address. Use the peer address
890 * as a reasonable default for now, but consider fixing
891 * the rpc client not to require an address in the
894 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
895 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
897 nfsd4_probe_callback(clp);
901 /* caller must hold client_lock */
902 static struct nfsd4_session *
903 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
905 struct nfsd4_session *elem;
908 dump_sessionid(__func__, sessionid);
909 idx = hash_sessionid(sessionid);
910 /* Search in the appropriate list */
911 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
912 if (!memcmp(elem->se_sessionid.data, sessionid->data,
913 NFS4_MAX_SESSIONID_LEN)) {
918 dprintk("%s: session not found\n", __func__);
922 /* caller must hold client_lock */
924 unhash_session(struct nfsd4_session *ses)
926 list_del(&ses->se_hash);
927 spin_lock(&ses->se_client->cl_lock);
928 list_del(&ses->se_perclnt);
929 spin_unlock(&ses->se_client->cl_lock);
932 /* must be called under the client_lock */
934 renew_client_locked(struct nfs4_client *clp)
936 if (is_client_expired(clp)) {
937 dprintk("%s: client (clientid %08x/%08x) already expired\n",
939 clp->cl_clientid.cl_boot,
940 clp->cl_clientid.cl_id);
944 dprintk("renewing client (clientid %08x/%08x)\n",
945 clp->cl_clientid.cl_boot,
946 clp->cl_clientid.cl_id);
947 list_move_tail(&clp->cl_lru, &client_lru);
948 clp->cl_time = get_seconds();
952 renew_client(struct nfs4_client *clp)
954 spin_lock(&client_lock);
955 renew_client_locked(clp);
956 spin_unlock(&client_lock);
959 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
961 STALE_CLIENTID(clientid_t *clid)
963 if (clid->cl_boot == boot_time)
965 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
966 clid->cl_boot, clid->cl_id, boot_time);
971 * XXX Should we use a slab cache ?
972 * This type of memory management is somewhat inefficient, but we use it
973 * anyway since SETCLIENTID is not a common operation.
975 static struct nfs4_client *alloc_client(struct xdr_netobj name)
977 struct nfs4_client *clp;
979 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
982 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
983 if (clp->cl_name.data == NULL) {
987 memcpy(clp->cl_name.data, name.data, name.len);
988 clp->cl_name.len = name.len;
993 free_client(struct nfs4_client *clp)
995 while (!list_empty(&clp->cl_sessions)) {
996 struct nfsd4_session *ses;
997 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
999 list_del(&ses->se_perclnt);
1000 nfsd4_put_session(ses);
1002 if (clp->cl_cred.cr_group_info)
1003 put_group_info(clp->cl_cred.cr_group_info);
1004 kfree(clp->cl_principal);
1005 kfree(clp->cl_name.data);
1006 idr_remove_all(&clp->cl_stateids);
1007 idr_destroy(&clp->cl_stateids);
1012 release_session_client(struct nfsd4_session *session)
1014 struct nfs4_client *clp = session->se_client;
1016 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1018 if (is_client_expired(clp)) {
1020 session->se_client = NULL;
1022 renew_client_locked(clp);
1023 spin_unlock(&client_lock);
1026 /* must be called under the client_lock */
1028 unhash_client_locked(struct nfs4_client *clp)
1030 struct nfsd4_session *ses;
1032 mark_client_expired(clp);
1033 list_del(&clp->cl_lru);
1034 spin_lock(&clp->cl_lock);
1035 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1036 list_del_init(&ses->se_hash);
1037 spin_unlock(&clp->cl_lock);
1041 expire_client(struct nfs4_client *clp)
1043 struct nfs4_openowner *oo;
1044 struct nfs4_delegation *dp;
1045 struct list_head reaplist;
1047 INIT_LIST_HEAD(&reaplist);
1048 spin_lock(&recall_lock);
1049 while (!list_empty(&clp->cl_delegations)) {
1050 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1051 list_del_init(&dp->dl_perclnt);
1052 list_move(&dp->dl_recall_lru, &reaplist);
1054 spin_unlock(&recall_lock);
1055 while (!list_empty(&reaplist)) {
1056 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1057 list_del_init(&dp->dl_recall_lru);
1058 unhash_delegation(dp);
1060 while (!list_empty(&clp->cl_openowners)) {
1061 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1062 release_openowner(oo);
1064 nfsd4_shutdown_callback(clp);
1065 if (clp->cl_cb_conn.cb_xprt)
1066 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1067 list_del(&clp->cl_idhash);
1068 list_del(&clp->cl_strhash);
1069 spin_lock(&client_lock);
1070 unhash_client_locked(clp);
1071 if (atomic_read(&clp->cl_refcount) == 0)
1073 spin_unlock(&client_lock);
1076 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1078 memcpy(target->cl_verifier.data, source->data,
1079 sizeof(target->cl_verifier.data));
1082 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1084 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1085 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1088 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
1090 target->cr_uid = source->cr_uid;
1091 target->cr_gid = source->cr_gid;
1092 target->cr_group_info = source->cr_group_info;
1093 get_group_info(target->cr_group_info);
1096 static int same_name(const char *n1, const char *n2)
1098 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1102 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1104 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1108 same_clid(clientid_t *cl1, clientid_t *cl2)
1110 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1113 /* XXX what about NGROUP */
1115 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1117 return cr1->cr_uid == cr2->cr_uid;
1120 static void gen_clid(struct nfs4_client *clp)
1122 static u32 current_clientid = 1;
1124 clp->cl_clientid.cl_boot = boot_time;
1125 clp->cl_clientid.cl_id = current_clientid++;
1128 static void gen_confirm(struct nfs4_client *clp)
1133 p = (u32 *)clp->cl_confirm.data;
1134 *p++ = get_seconds();
1138 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1140 return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1143 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1145 struct nfs4_stid *s;
1147 s = find_stateid(cl, t);
1150 if (typemask & s->sc_type)
1155 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
1156 struct svc_rqst *rqstp, nfs4_verifier *verf)
1158 struct nfs4_client *clp;
1159 struct sockaddr *sa = svc_addr(rqstp);
1162 clp = alloc_client(name);
1166 INIT_LIST_HEAD(&clp->cl_sessions);
1168 princ = svc_gss_principal(rqstp);
1170 clp->cl_principal = kstrdup(princ, GFP_KERNEL);
1171 if (clp->cl_principal == NULL) {
1177 idr_init(&clp->cl_stateids);
1178 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1179 atomic_set(&clp->cl_refcount, 0);
1180 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1181 INIT_LIST_HEAD(&clp->cl_idhash);
1182 INIT_LIST_HEAD(&clp->cl_strhash);
1183 INIT_LIST_HEAD(&clp->cl_openowners);
1184 INIT_LIST_HEAD(&clp->cl_delegations);
1185 INIT_LIST_HEAD(&clp->cl_lru);
1186 INIT_LIST_HEAD(&clp->cl_callbacks);
1187 spin_lock_init(&clp->cl_lock);
1188 INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
1189 clp->cl_time = get_seconds();
1190 clear_bit(0, &clp->cl_cb_slot_busy);
1191 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1192 copy_verf(clp, verf);
1193 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1194 clp->cl_flavor = rqstp->rq_flavor;
1195 copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1197 clp->cl_cb_session = NULL;
1202 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1204 unsigned int idhashval;
1206 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1207 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1208 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1213 move_to_confirmed(struct nfs4_client *clp)
1215 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1216 unsigned int strhashval;
1218 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1219 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1220 strhashval = clientstr_hashval(clp->cl_recdir);
1221 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1225 static struct nfs4_client *
1226 find_confirmed_client(clientid_t *clid)
1228 struct nfs4_client *clp;
1229 unsigned int idhashval = clientid_hashval(clid->cl_id);
1231 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1232 if (same_clid(&clp->cl_clientid, clid)) {
1240 static struct nfs4_client *
1241 find_unconfirmed_client(clientid_t *clid)
1243 struct nfs4_client *clp;
1244 unsigned int idhashval = clientid_hashval(clid->cl_id);
1246 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1247 if (same_clid(&clp->cl_clientid, clid))
1253 static bool clp_used_exchangeid(struct nfs4_client *clp)
1255 return clp->cl_exchange_flags != 0;
1258 static struct nfs4_client *
1259 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
1261 struct nfs4_client *clp;
1263 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
1264 if (same_name(clp->cl_recdir, dname))
1270 static struct nfs4_client *
1271 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
1273 struct nfs4_client *clp;
1275 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
1276 if (same_name(clp->cl_recdir, dname))
1283 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1285 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1286 struct sockaddr *sa = svc_addr(rqstp);
1287 u32 scopeid = rpc_get_scope_id(sa);
1288 unsigned short expected_family;
1290 /* Currently, we only support tcp and tcp6 for the callback channel */
1291 if (se->se_callback_netid_len == 3 &&
1292 !memcmp(se->se_callback_netid_val, "tcp", 3))
1293 expected_family = AF_INET;
1294 else if (se->se_callback_netid_len == 4 &&
1295 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1296 expected_family = AF_INET6;
1300 conn->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
1301 se->se_callback_addr_len,
1302 (struct sockaddr *)&conn->cb_addr,
1303 sizeof(conn->cb_addr));
1305 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1308 if (conn->cb_addr.ss_family == AF_INET6)
1309 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1311 conn->cb_prog = se->se_callback_prog;
1312 conn->cb_ident = se->se_callback_ident;
1313 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1316 conn->cb_addr.ss_family = AF_UNSPEC;
1317 conn->cb_addrlen = 0;
1318 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1319 "will not receive delegations\n",
1320 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1326 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1329 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1331 struct nfsd4_slot *slot = resp->cstate.slot;
1334 dprintk("--> %s slot %p\n", __func__, slot);
1336 slot->sl_opcnt = resp->opcnt;
1337 slot->sl_status = resp->cstate.status;
1339 if (nfsd4_not_cached(resp)) {
1340 slot->sl_datalen = 0;
1343 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1344 base = (char *)resp->cstate.datap -
1345 (char *)resp->xbuf->head[0].iov_base;
1346 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1348 WARN("%s: sessions DRC could not cache compound\n", __func__);
1353 * Encode the replay sequence operation from the slot values.
1354 * If cachethis is FALSE encode the uncached rep error on the next
1355 * operation which sets resp->p and increments resp->opcnt for
1356 * nfs4svc_encode_compoundres.
1360 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1361 struct nfsd4_compoundres *resp)
1363 struct nfsd4_op *op;
1364 struct nfsd4_slot *slot = resp->cstate.slot;
1366 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
1367 resp->opcnt, resp->cstate.slot->sl_cachethis);
1369 /* Encode the replayed sequence operation */
1370 op = &args->ops[resp->opcnt - 1];
1371 nfsd4_encode_operation(resp, op);
1373 /* Return nfserr_retry_uncached_rep in next operation. */
1374 if (args->opcnt > 1 && slot->sl_cachethis == 0) {
1375 op = &args->ops[resp->opcnt++];
1376 op->status = nfserr_retry_uncached_rep;
1377 nfsd4_encode_operation(resp, op);
1383 * The sequence operation is not cached because we can use the slot and
1387 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1388 struct nfsd4_sequence *seq)
1390 struct nfsd4_slot *slot = resp->cstate.slot;
1393 dprintk("--> %s slot %p\n", __func__, slot);
1395 /* Either returns 0 or nfserr_retry_uncached */
1396 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1397 if (status == nfserr_retry_uncached_rep)
1400 /* The sequence operation has been encoded, cstate->datap set. */
1401 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1403 resp->opcnt = slot->sl_opcnt;
1404 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1405 status = slot->sl_status;
1411 * Set the exchange_id flags returned by the server.
1414 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1416 /* pNFS is not supported */
1417 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1419 /* Referrals are supported, Migration is not. */
1420 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1422 /* set the wire flags to return to client. */
1423 clid->flags = new->cl_exchange_flags;
1427 nfsd4_exchange_id(struct svc_rqst *rqstp,
1428 struct nfsd4_compound_state *cstate,
1429 struct nfsd4_exchange_id *exid)
1431 struct nfs4_client *unconf, *conf, *new;
1433 unsigned int strhashval;
1434 char dname[HEXDIR_LEN];
1435 char addr_str[INET6_ADDRSTRLEN];
1436 nfs4_verifier verf = exid->verifier;
1437 struct sockaddr *sa = svc_addr(rqstp);
1439 rpc_ntop(sa, addr_str, sizeof(addr_str));
1440 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1441 "ip_addr=%s flags %x, spa_how %d\n",
1442 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1443 addr_str, exid->flags, exid->spa_how);
1445 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1446 return nfserr_inval;
1448 /* Currently only support SP4_NONE */
1449 switch (exid->spa_how) {
1453 return nfserr_serverfault;
1455 BUG(); /* checked by xdr code */
1457 return nfserr_serverfault; /* no excuse :-/ */
1460 status = nfs4_make_rec_clidname(dname, &exid->clname);
1465 strhashval = clientstr_hashval(dname);
1470 conf = find_confirmed_client_by_str(dname, strhashval);
1472 if (!clp_used_exchangeid(conf)) {
1473 status = nfserr_clid_inuse; /* XXX: ? */
1476 if (!same_verf(&verf, &conf->cl_verifier)) {
1477 /* 18.35.4 case 8 */
1478 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1479 status = nfserr_not_same;
1482 /* Client reboot: destroy old state */
1483 expire_client(conf);
1486 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1487 /* 18.35.4 case 9 */
1488 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1489 status = nfserr_perm;
1492 expire_client(conf);
1496 * Set bit when the owner id and verifier map to an already
1497 * confirmed client id (18.35.3).
1499 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1502 * Falling into 18.35.4 case 2, possible router replay.
1503 * Leave confirmed record intact and return same result.
1505 copy_verf(conf, &verf);
1510 /* 18.35.4 case 7 */
1511 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1512 status = nfserr_noent;
1516 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1519 * Possible retry or client restart. Per 18.35.4 case 4,
1520 * a new unconfirmed record should be generated regardless
1521 * of whether any properties have changed.
1523 expire_client(unconf);
1528 new = create_client(exid->clname, dname, rqstp, &verf);
1530 status = nfserr_jukebox;
1535 add_to_unconfirmed(new, strhashval);
1537 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1538 exid->clientid.cl_id = new->cl_clientid.cl_id;
1541 nfsd4_set_ex_flags(new, exid);
1543 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1544 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1548 nfs4_unlock_state();
1550 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1555 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1557 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1560 /* The slot is in use, and no response has been sent. */
1562 if (seqid == slot_seqid)
1563 return nfserr_jukebox;
1565 return nfserr_seq_misordered;
1568 if (likely(seqid == slot_seqid + 1))
1571 if (seqid == slot_seqid)
1572 return nfserr_replay_cache;
1574 if (seqid == 1 && (slot_seqid + 1) == 0)
1576 /* Misordered replay or misordered new request */
1577 return nfserr_seq_misordered;
1581 * Cache the create session result into the create session single DRC
1582 * slot cache by saving the xdr structure. sl_seqid has been set.
1583 * Do this for solo or embedded create session operations.
1586 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1587 struct nfsd4_clid_slot *slot, int nfserr)
1589 slot->sl_status = nfserr;
1590 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1594 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1595 struct nfsd4_clid_slot *slot)
1597 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1598 return slot->sl_status;
1601 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1602 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1603 1 + /* MIN tag is length with zero, only length */ \
1604 3 + /* version, opcount, opcode */ \
1605 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1606 /* seqid, slotID, slotID, cache */ \
1607 4 ) * sizeof(__be32))
1609 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1610 2 + /* verifier: AUTH_NULL, length 0 */\
1612 1 + /* MIN tag is length with zero, only length */ \
1613 3 + /* opcount, opcode, opstatus*/ \
1614 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1615 /* seqid, slotID, slotID, slotID, status */ \
1616 5 ) * sizeof(__be32))
1618 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1620 return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1621 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1625 nfsd4_create_session(struct svc_rqst *rqstp,
1626 struct nfsd4_compound_state *cstate,
1627 struct nfsd4_create_session *cr_ses)
1629 struct sockaddr *sa = svc_addr(rqstp);
1630 struct nfs4_client *conf, *unconf;
1631 struct nfsd4_session *new;
1632 struct nfsd4_clid_slot *cs_slot = NULL;
1633 bool confirm_me = false;
1636 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1637 return nfserr_inval;
1640 unconf = find_unconfirmed_client(&cr_ses->clientid);
1641 conf = find_confirmed_client(&cr_ses->clientid);
1644 cs_slot = &conf->cl_cs_slot;
1645 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1646 if (status == nfserr_replay_cache) {
1647 dprintk("Got a create_session replay! seqid= %d\n",
1649 /* Return the cached reply status */
1650 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1652 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1653 status = nfserr_seq_misordered;
1654 dprintk("Sequence misordered!\n");
1655 dprintk("Expected seqid= %d but got seqid= %d\n",
1656 cs_slot->sl_seqid, cr_ses->seqid);
1659 } else if (unconf) {
1660 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1661 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1662 status = nfserr_clid_inuse;
1666 cs_slot = &unconf->cl_cs_slot;
1667 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1669 /* an unconfirmed replay returns misordered */
1670 status = nfserr_seq_misordered;
1677 status = nfserr_stale_clientid;
1682 * XXX: we should probably set this at creation time, and check
1683 * for consistent minorversion use throughout:
1685 conf->cl_minorversion = 1;
1687 * We do not support RDMA or persistent sessions
1689 cr_ses->flags &= ~SESSION4_PERSIST;
1690 cr_ses->flags &= ~SESSION4_RDMA;
1692 status = nfserr_toosmall;
1693 if (check_forechannel_attrs(cr_ses->fore_channel))
1696 status = nfserr_jukebox;
1697 new = alloc_init_session(rqstp, conf, cr_ses);
1701 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1702 NFS4_MAX_SESSIONID_LEN);
1703 memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1704 sizeof(struct nfsd4_channel_attrs));
1705 cs_slot->sl_seqid++;
1706 cr_ses->seqid = cs_slot->sl_seqid;
1708 /* cache solo and embedded create sessions under the state lock */
1709 nfsd4_cache_create_session(cr_ses, cs_slot, status);
1711 move_to_confirmed(conf);
1713 nfs4_unlock_state();
1714 dprintk("%s returns %d\n", __func__, ntohl(status));
1718 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1720 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1721 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1723 return argp->opcnt == resp->opcnt;
1726 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1729 case NFS4_CDFC4_FORE:
1730 case NFS4_CDFC4_BACK:
1732 case NFS4_CDFC4_FORE_OR_BOTH:
1733 case NFS4_CDFC4_BACK_OR_BOTH:
1734 *dir = NFS4_CDFC4_BOTH;
1737 return nfserr_inval;
1740 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1741 struct nfsd4_compound_state *cstate,
1742 struct nfsd4_bind_conn_to_session *bcts)
1746 if (!nfsd4_last_compound_op(rqstp))
1747 return nfserr_not_only_op;
1748 spin_lock(&client_lock);
1749 cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1750 /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1751 * client_lock iself: */
1752 if (cstate->session) {
1753 nfsd4_get_session(cstate->session);
1754 atomic_inc(&cstate->session->se_client->cl_refcount);
1756 spin_unlock(&client_lock);
1757 if (!cstate->session)
1758 return nfserr_badsession;
1760 status = nfsd4_map_bcts_dir(&bcts->dir);
1762 nfsd4_new_conn(rqstp, cstate->session, bcts->dir);
1766 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1770 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1774 nfsd4_destroy_session(struct svc_rqst *r,
1775 struct nfsd4_compound_state *cstate,
1776 struct nfsd4_destroy_session *sessionid)
1778 struct nfsd4_session *ses;
1779 u32 status = nfserr_badsession;
1782 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1783 * - Should we return nfserr_back_chan_busy if waiting for
1784 * callbacks on to-be-destroyed session?
1785 * - Do we need to clear any callback info from previous session?
1788 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1789 if (!nfsd4_last_compound_op(r))
1790 return nfserr_not_only_op;
1792 dump_sessionid(__func__, &sessionid->sessionid);
1793 spin_lock(&client_lock);
1794 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1796 spin_unlock(&client_lock);
1800 unhash_session(ses);
1801 spin_unlock(&client_lock);
1804 nfsd4_probe_callback_sync(ses->se_client);
1805 nfs4_unlock_state();
1807 nfsd4_del_conns(ses);
1809 nfsd4_put_session(ses);
1812 dprintk("%s returns %d\n", __func__, ntohl(status));
1816 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1818 struct nfsd4_conn *c;
1820 list_for_each_entry(c, &s->se_conns, cn_persession) {
1821 if (c->cn_xprt == xpt) {
1828 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1830 struct nfs4_client *clp = ses->se_client;
1831 struct nfsd4_conn *c;
1834 spin_lock(&clp->cl_lock);
1835 c = __nfsd4_find_conn(new->cn_xprt, ses);
1837 spin_unlock(&clp->cl_lock);
1841 __nfsd4_hash_conn(new, ses);
1842 spin_unlock(&clp->cl_lock);
1843 ret = nfsd4_register_conn(new);
1845 /* oops; xprt is already down: */
1846 nfsd4_conn_lost(&new->cn_xpt_user);
1850 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
1852 struct nfsd4_compoundargs *args = rqstp->rq_argp;
1854 return args->opcnt > session->se_fchannel.maxops;
1857 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
1858 struct nfsd4_session *session)
1860 struct xdr_buf *xb = &rqstp->rq_arg;
1862 return xb->len > session->se_fchannel.maxreq_sz;
1866 nfsd4_sequence(struct svc_rqst *rqstp,
1867 struct nfsd4_compound_state *cstate,
1868 struct nfsd4_sequence *seq)
1870 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1871 struct nfsd4_session *session;
1872 struct nfsd4_slot *slot;
1873 struct nfsd4_conn *conn;
1876 if (resp->opcnt != 1)
1877 return nfserr_sequence_pos;
1880 * Will be either used or freed by nfsd4_sequence_check_conn
1883 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1885 return nfserr_jukebox;
1887 spin_lock(&client_lock);
1888 status = nfserr_badsession;
1889 session = find_in_sessionid_hashtbl(&seq->sessionid);
1893 status = nfserr_too_many_ops;
1894 if (nfsd4_session_too_many_ops(rqstp, session))
1897 status = nfserr_req_too_big;
1898 if (nfsd4_request_too_big(rqstp, session))
1901 status = nfserr_badslot;
1902 if (seq->slotid >= session->se_fchannel.maxreqs)
1905 slot = session->se_slots[seq->slotid];
1906 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1908 /* We do not negotiate the number of slots yet, so set the
1909 * maxslots to the session maxreqs which is used to encode
1910 * sr_highest_slotid and the sr_target_slot id to maxslots */
1911 seq->maxslots = session->se_fchannel.maxreqs;
1913 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
1914 if (status == nfserr_replay_cache) {
1915 cstate->slot = slot;
1916 cstate->session = session;
1917 /* Return the cached reply status and set cstate->status
1918 * for nfsd4_proc_compound processing */
1919 status = nfsd4_replay_cache_entry(resp, seq);
1920 cstate->status = nfserr_replay_cache;
1926 nfsd4_sequence_check_conn(conn, session);
1929 /* Success! bump slot seqid */
1930 slot->sl_inuse = true;
1931 slot->sl_seqid = seq->seqid;
1932 slot->sl_cachethis = seq->cachethis;
1934 cstate->slot = slot;
1935 cstate->session = session;
1938 /* Hold a session reference until done processing the compound. */
1939 if (cstate->session) {
1940 struct nfs4_client *clp = session->se_client;
1942 nfsd4_get_session(cstate->session);
1943 atomic_inc(&clp->cl_refcount);
1944 switch (clp->cl_cb_state) {
1946 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
1948 case NFSD4_CB_FAULT:
1949 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
1952 seq->status_flags = 0;
1956 spin_unlock(&client_lock);
1957 dprintk("%s: return %d\n", __func__, ntohl(status));
1961 static inline bool has_resources(struct nfs4_client *clp)
1963 return !list_empty(&clp->cl_openowners)
1964 || !list_empty(&clp->cl_delegations)
1965 || !list_empty(&clp->cl_sessions);
1969 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
1971 struct nfs4_client *conf, *unconf, *clp;
1975 unconf = find_unconfirmed_client(&dc->clientid);
1976 conf = find_confirmed_client(&dc->clientid);
1981 if (!is_client_expired(conf) && has_resources(conf)) {
1982 status = nfserr_clientid_busy;
1986 /* rfc5661 18.50.3 */
1987 if (cstate->session && conf == cstate->session->se_client) {
1988 status = nfserr_clientid_busy;
1994 status = nfserr_stale_clientid;
2000 nfs4_unlock_state();
2001 dprintk("%s return %d\n", __func__, ntohl(status));
2006 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2010 if (rc->rca_one_fs) {
2011 if (!cstate->current_fh.fh_dentry)
2012 return nfserr_nofilehandle;
2014 * We don't take advantage of the rca_one_fs case.
2015 * That's OK, it's optional, we can safely ignore it.
2021 status = nfserr_complete_already;
2022 if (cstate->session->se_client->cl_firststate)
2025 status = nfserr_stale_clientid;
2026 if (is_client_expired(cstate->session->se_client))
2028 * The following error isn't really legal.
2029 * But we only get here if the client just explicitly
2030 * destroyed the client. Surely it no longer cares what
2031 * error it gets back on an operation for the dead
2037 nfsd4_create_clid_dir(cstate->session->se_client);
2039 nfs4_unlock_state();
2044 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2045 struct nfsd4_setclientid *setclid)
2047 struct xdr_netobj clname = setclid->se_name;
2048 nfs4_verifier clverifier = setclid->se_verf;
2049 unsigned int strhashval;
2050 struct nfs4_client *conf, *unconf, *new;
2052 char dname[HEXDIR_LEN];
2054 status = nfs4_make_rec_clidname(dname, &clname);
2059 * XXX The Duplicate Request Cache (DRC) has been checked (??)
2060 * We get here on a DRC miss.
2063 strhashval = clientstr_hashval(dname);
2066 conf = find_confirmed_client_by_str(dname, strhashval);
2068 /* RFC 3530 14.2.33 CASE 0: */
2069 status = nfserr_clid_inuse;
2070 if (clp_used_exchangeid(conf))
2072 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2073 char addr_str[INET6_ADDRSTRLEN];
2074 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2076 dprintk("NFSD: setclientid: string in use by client "
2077 "at %s\n", addr_str);
2082 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
2083 * has a description of SETCLIENTID request processing consisting
2084 * of 5 bullet points, labeled as CASE0 - CASE4 below.
2086 unconf = find_unconfirmed_client_by_str(dname, strhashval);
2087 status = nfserr_jukebox;
2090 * RFC 3530 14.2.33 CASE 4:
2091 * placed first, because it is the normal case
2094 expire_client(unconf);
2095 new = create_client(clname, dname, rqstp, &clverifier);
2099 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
2101 * RFC 3530 14.2.33 CASE 1:
2102 * probable callback update
2105 /* Note this is removing unconfirmed {*x***},
2106 * which is stronger than RFC recommended {vxc**}.
2107 * This has the advantage that there is at most
2108 * one {*x***} in either list at any time.
2110 expire_client(unconf);
2112 new = create_client(clname, dname, rqstp, &clverifier);
2115 copy_clid(new, conf);
2116 } else if (!unconf) {
2118 * RFC 3530 14.2.33 CASE 2:
2119 * probable client reboot; state will be removed if
2122 new = create_client(clname, dname, rqstp, &clverifier);
2128 * RFC 3530 14.2.33 CASE 3:
2129 * probable client reboot; state will be removed if
2132 expire_client(unconf);
2133 new = create_client(clname, dname, rqstp, &clverifier);
2139 * XXX: we should probably set this at creation time, and check
2140 * for consistent minorversion use throughout:
2142 new->cl_minorversion = 0;
2143 gen_callback(new, setclid, rqstp);
2144 add_to_unconfirmed(new, strhashval);
2145 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2146 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2147 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2150 nfs4_unlock_state();
2156 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
2157 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
2158 * bullets, labeled as CASE1 - CASE4 below.
2161 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2162 struct nfsd4_compound_state *cstate,
2163 struct nfsd4_setclientid_confirm *setclientid_confirm)
2165 struct sockaddr *sa = svc_addr(rqstp);
2166 struct nfs4_client *conf, *unconf;
2167 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2168 clientid_t * clid = &setclientid_confirm->sc_clientid;
2171 if (STALE_CLIENTID(clid))
2172 return nfserr_stale_clientid;
2174 * XXX The Duplicate Request Cache (DRC) has been checked (??)
2175 * We get here on a DRC miss.
2180 conf = find_confirmed_client(clid);
2181 unconf = find_unconfirmed_client(clid);
2183 status = nfserr_clid_inuse;
2184 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
2186 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
2190 * section 14.2.34 of RFC 3530 has a description of
2191 * SETCLIENTID_CONFIRM request processing consisting
2192 * of 4 bullet points, labeled as CASE1 - CASE4 below.
2194 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
2196 * RFC 3530 14.2.34 CASE 1:
2199 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
2200 status = nfserr_clid_inuse;
2202 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2203 nfsd4_probe_callback(conf);
2204 expire_client(unconf);
2208 } else if (conf && !unconf) {
2210 * RFC 3530 14.2.34 CASE 2:
2211 * probable retransmitted request; play it safe and
2214 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
2215 status = nfserr_clid_inuse;
2218 } else if (!conf && unconf
2219 && same_verf(&unconf->cl_confirm, &confirm)) {
2221 * RFC 3530 14.2.34 CASE 3:
2222 * Normal case; new or rebooted client:
2224 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
2225 status = nfserr_clid_inuse;
2228 clientstr_hashval(unconf->cl_recdir);
2229 conf = find_confirmed_client_by_str(unconf->cl_recdir,
2232 nfsd4_remove_clid_dir(conf);
2233 expire_client(conf);
2235 move_to_confirmed(unconf);
2237 nfsd4_probe_callback(conf);
2240 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
2241 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
2244 * RFC 3530 14.2.34 CASE 4:
2245 * Client probably hasn't noticed that we rebooted yet.
2247 status = nfserr_stale_clientid;
2249 /* check that we have hit one of the cases...*/
2250 status = nfserr_clid_inuse;
2253 nfs4_unlock_state();
2257 static struct nfs4_file *nfsd4_alloc_file(void)
2259 return kmem_cache_alloc(file_slab, GFP_KERNEL);
2262 /* OPEN Share state helper functions */
2263 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2265 unsigned int hashval = file_hashval(ino);
2267 atomic_set(&fp->fi_ref, 1);
2268 INIT_LIST_HEAD(&fp->fi_hash);
2269 INIT_LIST_HEAD(&fp->fi_stateids);
2270 INIT_LIST_HEAD(&fp->fi_delegations);
2271 fp->fi_inode = igrab(ino);
2272 fp->fi_had_conflict = false;
2273 fp->fi_lease = NULL;
2274 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2275 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2276 spin_lock(&recall_lock);
2277 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2278 spin_unlock(&recall_lock);
2282 nfsd4_free_slab(struct kmem_cache **slab)
2286 kmem_cache_destroy(*slab);
2291 nfsd4_free_slabs(void)
2293 nfsd4_free_slab(&openowner_slab);
2294 nfsd4_free_slab(&lockowner_slab);
2295 nfsd4_free_slab(&file_slab);
2296 nfsd4_free_slab(&stateid_slab);
2297 nfsd4_free_slab(&deleg_slab);
2301 nfsd4_init_slabs(void)
2303 openowner_slab = kmem_cache_create("nfsd4_openowners",
2304 sizeof(struct nfs4_openowner), 0, 0, NULL);
2305 if (openowner_slab == NULL)
2307 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2308 sizeof(struct nfs4_lockowner), 0, 0, NULL);
2309 if (lockowner_slab == NULL)
2311 file_slab = kmem_cache_create("nfsd4_files",
2312 sizeof(struct nfs4_file), 0, 0, NULL);
2313 if (file_slab == NULL)
2315 stateid_slab = kmem_cache_create("nfsd4_stateids",
2316 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2317 if (stateid_slab == NULL)
2319 deleg_slab = kmem_cache_create("nfsd4_delegations",
2320 sizeof(struct nfs4_delegation), 0, 0, NULL);
2321 if (deleg_slab == NULL)
2326 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2330 void nfs4_free_openowner(struct nfs4_openowner *oo)
2332 kfree(oo->oo_owner.so_owner.data);
2333 kmem_cache_free(openowner_slab, oo);
2336 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2338 kfree(lo->lo_owner.so_owner.data);
2339 kmem_cache_free(lockowner_slab, lo);
2342 static void init_nfs4_replay(struct nfs4_replay *rp)
2344 rp->rp_status = nfserr_serverfault;
2346 rp->rp_buf = rp->rp_ibuf;
2349 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2351 struct nfs4_stateowner *sop;
2353 sop = kmem_cache_alloc(slab, GFP_KERNEL);
2357 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2358 if (!sop->so_owner.data) {
2359 kmem_cache_free(slab, sop);
2362 sop->so_owner.len = owner->len;
2364 INIT_LIST_HEAD(&sop->so_stateids);
2365 sop->so_client = clp;
2366 init_nfs4_replay(&sop->so_replay);
2370 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2372 list_add(&oo->oo_owner.so_strhash, &open_ownerstr_hashtbl[strhashval]);
2373 list_add(&oo->oo_perclient, &clp->cl_openowners);
2376 static struct nfs4_openowner *
2377 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2378 struct nfs4_openowner *oo;
2380 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2383 oo->oo_owner.so_is_open_owner = 1;
2384 oo->oo_owner.so_seqid = open->op_seqid;
2385 oo->oo_flags = NFS4_OO_NEW;
2387 oo->oo_last_closed_stid = NULL;
2388 INIT_LIST_HEAD(&oo->oo_close_lru);
2389 hash_openowner(oo, clp, strhashval);
2393 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2394 struct nfs4_openowner *oo = open->op_openowner;
2395 struct nfs4_client *clp = oo->oo_owner.so_client;
2397 init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2398 INIT_LIST_HEAD(&stp->st_lockowners);
2399 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2400 list_add(&stp->st_perfile, &fp->fi_stateids);
2401 stp->st_stateowner = &oo->oo_owner;
2404 stp->st_access_bmap = 0;
2405 stp->st_deny_bmap = 0;
2406 __set_bit(open->op_share_access, &stp->st_access_bmap);
2407 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2408 stp->st_openstp = NULL;
2412 move_to_close_lru(struct nfs4_openowner *oo)
2414 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2416 list_move_tail(&oo->oo_close_lru, &close_lru);
2417 oo->oo_time = get_seconds();
2421 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2424 return (sop->so_owner.len == owner->len) &&
2425 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2426 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2429 static struct nfs4_openowner *
2430 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2432 struct nfs4_stateowner *so;
2433 struct nfs4_openowner *oo;
2435 list_for_each_entry(so, &open_ownerstr_hashtbl[hashval], so_strhash) {
2436 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2438 renew_client(oo->oo_owner.so_client);
2445 /* search file_hashtbl[] for file */
2446 static struct nfs4_file *
2447 find_file(struct inode *ino)
2449 unsigned int hashval = file_hashval(ino);
2450 struct nfs4_file *fp;
2452 spin_lock(&recall_lock);
2453 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2454 if (fp->fi_inode == ino) {
2456 spin_unlock(&recall_lock);
2460 spin_unlock(&recall_lock);
2465 * Called to check deny when READ with all zero stateid or
2466 * WRITE with all zero or all one stateid
2469 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2471 struct inode *ino = current_fh->fh_dentry->d_inode;
2472 struct nfs4_file *fp;
2473 struct nfs4_ol_stateid *stp;
2476 dprintk("NFSD: nfs4_share_conflict\n");
2478 fp = find_file(ino);
2481 ret = nfserr_locked;
2482 /* Search for conflicting share reservations */
2483 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2484 if (test_bit(deny_type, &stp->st_deny_bmap) ||
2485 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2494 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2496 /* We're assuming the state code never drops its reference
2497 * without first removing the lease. Since we're in this lease
2498 * callback (and since the lease code is serialized by the kernel
2499 * lock) we know the server hasn't removed the lease yet, we know
2500 * it's safe to take a reference: */
2501 atomic_inc(&dp->dl_count);
2503 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2505 /* only place dl_time is set. protected by lock_flocks*/
2506 dp->dl_time = get_seconds();
2508 nfsd4_cb_recall(dp);
2511 /* Called from break_lease() with lock_flocks() held. */
2512 static void nfsd_break_deleg_cb(struct file_lock *fl)
2514 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2515 struct nfs4_delegation *dp;
2518 /* We assume break_lease is only called once per lease: */
2519 BUG_ON(fp->fi_had_conflict);
2521 * We don't want the locks code to timeout the lease for us;
2522 * we'll remove it ourself if a delegation isn't returned
2525 fl->fl_break_time = 0;
2527 spin_lock(&recall_lock);
2528 fp->fi_had_conflict = true;
2529 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2530 nfsd_break_one_deleg(dp);
2531 spin_unlock(&recall_lock);
2535 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2538 return lease_modify(onlist, arg);
2543 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2544 .lm_break = nfsd_break_deleg_cb,
2545 .lm_change = nfsd_change_deleg_cb,
2548 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2550 if (nfsd4_has_session(cstate))
2552 if (seqid == so->so_seqid - 1)
2553 return nfserr_replay_me;
2554 if (seqid == so->so_seqid)
2556 return nfserr_bad_seqid;
2560 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2561 struct nfsd4_open *open)
2563 clientid_t *clientid = &open->op_clientid;
2564 struct nfs4_client *clp = NULL;
2565 unsigned int strhashval;
2566 struct nfs4_openowner *oo = NULL;
2569 if (STALE_CLIENTID(&open->op_clientid))
2570 return nfserr_stale_clientid;
2572 * In case we need it later, after we've already created the
2573 * file and don't want to risk a further failure:
2575 open->op_file = nfsd4_alloc_file();
2576 if (open->op_file == NULL)
2577 return nfserr_jukebox;
2579 strhashval = open_ownerstr_hashval(clientid->cl_id, &open->op_owner);
2580 oo = find_openstateowner_str(strhashval, open);
2581 open->op_openowner = oo;
2583 clp = find_confirmed_client(clientid);
2585 return nfserr_expired;
2588 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2589 /* Replace unconfirmed owners without checking for replay. */
2590 clp = oo->oo_owner.so_client;
2591 release_openowner(oo);
2592 open->op_openowner = NULL;
2595 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2598 clp = oo->oo_owner.so_client;
2601 oo = alloc_init_open_stateowner(strhashval, clp, open);
2603 return nfserr_jukebox;
2604 open->op_openowner = oo;
2606 open->op_stp = nfs4_alloc_stateid(clp);
2608 return nfserr_jukebox;
2612 static inline __be32
2613 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2615 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2616 return nfserr_openmode;
2621 static int share_access_to_flags(u32 share_access)
2623 share_access &= ~NFS4_SHARE_WANT_MASK;
2625 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2628 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2630 struct nfs4_stid *ret;
2632 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2635 return delegstateid(ret);
2638 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2640 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2641 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2645 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2646 struct nfs4_delegation **dp)
2649 __be32 status = nfserr_bad_stateid;
2651 *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2654 flags = share_access_to_flags(open->op_share_access);
2655 status = nfs4_check_delegmode(*dp, flags);
2659 if (!nfsd4_is_deleg_cur(open))
2663 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2668 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2670 struct nfs4_ol_stateid *local;
2671 struct nfs4_openowner *oo = open->op_openowner;
2673 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2674 /* ignore lock owners */
2675 if (local->st_stateowner->so_is_open_owner == 0)
2677 /* remember if we have seen this open owner */
2678 if (local->st_stateowner == &oo->oo_owner)
2680 /* check for conflicting share reservations */
2681 if (!test_share(local, open))
2682 return nfserr_share_denied;
2687 static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
2689 kmem_cache_free(stateid_slab, s);
2692 static inline int nfs4_access_to_access(u32 nfs4_access)
2696 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2697 flags |= NFSD_MAY_READ;
2698 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2699 flags |= NFSD_MAY_WRITE;
2703 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2704 struct svc_fh *cur_fh, struct nfsd4_open *open)
2707 int oflag = nfs4_access_to_omode(open->op_share_access);
2708 int access = nfs4_access_to_access(open->op_share_access);
2710 if (!fp->fi_fds[oflag]) {
2711 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2712 &fp->fi_fds[oflag]);
2716 nfs4_file_get_access(fp, oflag);
2721 static inline __be32
2722 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2723 struct nfsd4_open *open)
2725 struct iattr iattr = {
2726 .ia_valid = ATTR_SIZE,
2729 if (!open->op_truncate)
2731 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2732 return nfserr_inval;
2733 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2737 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
2739 u32 op_share_access = open->op_share_access;
2743 new_access = !test_bit(op_share_access, &stp->st_access_bmap);
2745 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2749 status = nfsd4_truncate(rqstp, cur_fh, open);
2752 int oflag = nfs4_access_to_omode(op_share_access);
2753 nfs4_file_put_access(fp, oflag);
2757 /* remember the open */
2758 __set_bit(op_share_access, &stp->st_access_bmap);
2759 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2766 nfs4_set_claim_prev(struct nfsd4_open *open)
2768 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2769 open->op_openowner->oo_owner.so_client->cl_firststate = 1;
2772 /* Should we give out recallable state?: */
2773 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2775 if (clp->cl_cb_state == NFSD4_CB_UP)
2778 * In the sessions case, since we don't have to establish a
2779 * separate connection for callbacks, we assume it's OK
2780 * until we hear otherwise:
2782 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2785 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2787 struct file_lock *fl;
2789 fl = locks_alloc_lock();
2792 locks_init_lock(fl);
2793 fl->fl_lmops = &nfsd_lease_mng_ops;
2794 fl->fl_flags = FL_LEASE;
2795 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2796 fl->fl_end = OFFSET_MAX;
2797 fl->fl_owner = (fl_owner_t)(dp->dl_file);
2798 fl->fl_pid = current->tgid;
2802 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2804 struct nfs4_file *fp = dp->dl_file;
2805 struct file_lock *fl;
2808 fl = nfs4_alloc_init_lease(dp, flag);
2811 fl->fl_file = find_readable_file(fp);
2812 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2813 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2815 list_del_init(&dp->dl_perclnt);
2816 locks_free_lock(fl);
2820 fp->fi_deleg_file = fl->fl_file;
2821 get_file(fp->fi_deleg_file);
2822 atomic_set(&fp->fi_delegees, 1);
2823 list_add(&dp->dl_perfile, &fp->fi_delegations);
2827 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2829 struct nfs4_file *fp = dp->dl_file;
2832 return nfs4_setlease(dp, flag);
2833 spin_lock(&recall_lock);
2834 if (fp->fi_had_conflict) {
2835 spin_unlock(&recall_lock);
2838 atomic_inc(&fp->fi_delegees);
2839 list_add(&dp->dl_perfile, &fp->fi_delegations);
2840 spin_unlock(&recall_lock);
2841 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2846 * Attempt to hand out a delegation.
2849 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2851 struct nfs4_delegation *dp;
2852 struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2854 int status, flag = 0;
2856 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2857 flag = NFS4_OPEN_DELEGATE_NONE;
2858 open->op_recall = 0;
2859 switch (open->op_claim_type) {
2860 case NFS4_OPEN_CLAIM_PREVIOUS:
2862 open->op_recall = 1;
2863 flag = open->op_delegate_type;
2864 if (flag == NFS4_OPEN_DELEGATE_NONE)
2867 case NFS4_OPEN_CLAIM_NULL:
2868 /* Let's not give out any delegations till everyone's
2869 * had the chance to reclaim theirs.... */
2870 if (locks_in_grace())
2872 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2874 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2875 flag = NFS4_OPEN_DELEGATE_WRITE;
2877 flag = NFS4_OPEN_DELEGATE_READ;
2883 dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2886 status = nfs4_set_delegation(dp, flag);
2890 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2892 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2893 STATEID_VAL(&dp->dl_stid.sc_stateid));
2895 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2896 && flag == NFS4_OPEN_DELEGATE_NONE
2897 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2898 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2899 open->op_delegate_type = flag;
2902 nfs4_put_delegation(dp);
2904 flag = NFS4_OPEN_DELEGATE_NONE;
2909 * called with nfs4_lock_state() held.
2912 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2914 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2915 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
2916 struct nfs4_file *fp = NULL;
2917 struct inode *ino = current_fh->fh_dentry->d_inode;
2918 struct nfs4_ol_stateid *stp = NULL;
2919 struct nfs4_delegation *dp = NULL;
2923 * Lookup file; if found, lookup stateid and check open request,
2924 * and check for delegations in the process of being recalled.
2925 * If not found, create the nfs4_file struct
2927 fp = find_file(ino);
2929 if ((status = nfs4_check_open(fp, open, &stp)))
2931 status = nfs4_check_deleg(cl, fp, open, &dp);
2935 status = nfserr_bad_stateid;
2936 if (nfsd4_is_deleg_cur(open))
2938 status = nfserr_jukebox;
2940 open->op_file = NULL;
2941 nfsd4_init_file(fp, ino);
2945 * OPEN the file, or upgrade an existing OPEN.
2946 * If truncate fails, the OPEN fails.
2949 /* Stateid was found, this is an OPEN upgrade */
2950 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
2954 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
2958 open->op_stp = NULL;
2959 init_open_stateid(stp, fp, open);
2960 status = nfsd4_truncate(rqstp, current_fh, open);
2962 release_open_stateid(stp);
2966 update_stateid(&stp->st_stid.sc_stateid);
2967 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
2969 if (nfsd4_has_session(&resp->cstate))
2970 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2973 * Attempt to hand out a delegation. No error return, because the
2974 * OPEN succeeds even if we fail.
2976 nfs4_open_delegation(current_fh, open, stp);
2980 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
2981 STATEID_VAL(&stp->st_stid.sc_stateid));
2985 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2986 nfs4_set_claim_prev(open);
2988 * To finish the open response, we just need to set the rflags.
2990 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2991 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
2992 !nfsd4_has_session(&resp->cstate))
2993 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2998 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3000 if (open->op_openowner) {
3001 struct nfs4_openowner *oo = open->op_openowner;
3003 if (!list_empty(&oo->oo_owner.so_stateids))
3004 list_del_init(&oo->oo_close_lru);
3005 if (oo->oo_flags & NFS4_OO_NEW) {
3007 release_openowner(oo);
3008 open->op_openowner = NULL;
3010 oo->oo_flags &= ~NFS4_OO_NEW;
3014 nfsd4_free_file(open->op_file);
3016 nfs4_free_stateid(open->op_stp);
3020 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3023 struct nfs4_client *clp;
3027 dprintk("process_renew(%08x/%08x): starting\n",
3028 clid->cl_boot, clid->cl_id);
3029 status = nfserr_stale_clientid;
3030 if (STALE_CLIENTID(clid))
3032 clp = find_confirmed_client(clid);
3033 status = nfserr_expired;
3035 /* We assume the client took too long to RENEW. */
3036 dprintk("nfsd4_renew: clientid not found!\n");
3039 status = nfserr_cb_path_down;
3040 if (!list_empty(&clp->cl_delegations)
3041 && clp->cl_cb_state != NFSD4_CB_UP)
3045 nfs4_unlock_state();
3049 static struct lock_manager nfsd4_manager = {
3053 nfsd4_end_grace(void)
3055 dprintk("NFSD: end of grace period\n");
3056 nfsd4_recdir_purge_old();
3057 locks_end_grace(&nfsd4_manager);
3059 * Now that every NFSv4 client has had the chance to recover and
3060 * to see the (possibly new, possibly shorter) lease time, we
3061 * can safely set the next grace time to the current lease time:
3063 nfsd4_grace = nfsd4_lease;
3067 nfs4_laundromat(void)
3069 struct nfs4_client *clp;
3070 struct nfs4_openowner *oo;
3071 struct nfs4_delegation *dp;
3072 struct list_head *pos, *next, reaplist;
3073 time_t cutoff = get_seconds() - nfsd4_lease;
3074 time_t t, clientid_val = nfsd4_lease;
3075 time_t u, test_val = nfsd4_lease;
3079 dprintk("NFSD: laundromat service - starting\n");
3080 if (locks_in_grace())
3082 INIT_LIST_HEAD(&reaplist);
3083 spin_lock(&client_lock);
3084 list_for_each_safe(pos, next, &client_lru) {
3085 clp = list_entry(pos, struct nfs4_client, cl_lru);
3086 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3087 t = clp->cl_time - cutoff;
3088 if (clientid_val > t)
3092 if (atomic_read(&clp->cl_refcount)) {
3093 dprintk("NFSD: client in use (clientid %08x)\n",
3094 clp->cl_clientid.cl_id);
3097 unhash_client_locked(clp);
3098 list_add(&clp->cl_lru, &reaplist);
3100 spin_unlock(&client_lock);
3101 list_for_each_safe(pos, next, &reaplist) {
3102 clp = list_entry(pos, struct nfs4_client, cl_lru);
3103 dprintk("NFSD: purging unused client (clientid %08x)\n",
3104 clp->cl_clientid.cl_id);
3105 nfsd4_remove_clid_dir(clp);
3108 spin_lock(&recall_lock);
3109 list_for_each_safe(pos, next, &del_recall_lru) {
3110 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3111 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3112 u = dp->dl_time - cutoff;
3117 list_move(&dp->dl_recall_lru, &reaplist);
3119 spin_unlock(&recall_lock);
3120 list_for_each_safe(pos, next, &reaplist) {
3121 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3122 list_del_init(&dp->dl_recall_lru);
3123 unhash_delegation(dp);
3125 test_val = nfsd4_lease;
3126 list_for_each_safe(pos, next, &close_lru) {
3127 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3128 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3129 u = oo->oo_time - cutoff;
3134 release_openowner(oo);
3136 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3137 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3138 nfs4_unlock_state();
3139 return clientid_val;
3142 static struct workqueue_struct *laundry_wq;
3143 static void laundromat_main(struct work_struct *);
3144 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3147 laundromat_main(struct work_struct *not_used)
3151 t = nfs4_laundromat();
3152 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3153 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3156 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3158 if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3159 return nfserr_bad_stateid;
3164 STALE_STATEID(stateid_t *stateid)
3166 if (stateid->si_opaque.so_clid.cl_boot == boot_time)
3168 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3169 STATEID_VAL(stateid));
3174 access_permit_read(unsigned long access_bmap)
3176 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
3177 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
3178 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
3182 access_permit_write(unsigned long access_bmap)
3184 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
3185 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
3189 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3191 __be32 status = nfserr_openmode;
3193 /* For lock stateid's, we test the parent open, not the lock: */
3194 if (stp->st_openstp)
3195 stp = stp->st_openstp;
3196 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
3198 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
3205 static inline __be32
3206 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
3208 if (ONE_STATEID(stateid) && (flags & RD_STATE))
3210 else if (locks_in_grace()) {
3211 /* Answer in remaining cases depends on existence of
3212 * conflicting state; so we must wait out the grace period. */
3213 return nfserr_grace;
3214 } else if (flags & WR_STATE)
3215 return nfs4_share_conflict(current_fh,
3216 NFS4_SHARE_DENY_WRITE);
3217 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3218 return nfs4_share_conflict(current_fh,
3219 NFS4_SHARE_DENY_READ);
3223 * Allow READ/WRITE during grace period on recovered state only for files
3224 * that are not able to provide mandatory locking.
3227 grace_disallows_io(struct inode *inode)
3229 return locks_in_grace() && mandatory_lock(inode);
3232 /* Returns true iff a is later than b: */
3233 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3235 return (s32)a->si_generation - (s32)b->si_generation > 0;
3238 static int check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3241 * When sessions are used the stateid generation number is ignored
3244 if (has_session && in->si_generation == 0)
3247 if (in->si_generation == ref->si_generation)
3250 /* If the client sends us a stateid from the future, it's buggy: */
3251 if (stateid_generation_after(in, ref))
3252 return nfserr_bad_stateid;
3254 * However, we could see a stateid from the past, even from a
3255 * non-buggy client. For example, if the client sends a lock
3256 * while some IO is outstanding, the lock may bump si_generation
3257 * while the IO is still in flight. The client could avoid that
3258 * situation by waiting for responses on all the IO requests,
3259 * but better performance may result in retrying IO that
3260 * receives an old_stateid error if requests are rarely
3261 * reordered in flight:
3263 return nfserr_old_stateid;
3266 __be32 nfs4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3268 struct nfs4_stid *s;
3269 struct nfs4_ol_stateid *ols;
3272 if (STALE_STATEID(stateid))
3273 return nfserr_stale_stateid;
3275 s = find_stateid(cl, stateid);
3277 return nfserr_stale_stateid;
3278 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3281 if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3283 ols = openlockstateid(s);
3284 if (ols->st_stateowner->so_is_open_owner
3285 && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3286 return nfserr_bad_stateid;
3290 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
3292 struct nfs4_client *cl;
3294 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3295 return nfserr_bad_stateid;
3296 if (STALE_STATEID(stateid))
3297 return nfserr_stale_stateid;
3298 cl = find_confirmed_client(&stateid->si_opaque.so_clid);
3300 return nfserr_expired;
3301 *s = find_stateid_by_type(cl, stateid, typemask);
3303 return nfserr_bad_stateid;
3309 * Checks for stateid operations
3312 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
3313 stateid_t *stateid, int flags, struct file **filpp)
3315 struct nfs4_stid *s;
3316 struct nfs4_ol_stateid *stp = NULL;
3317 struct nfs4_delegation *dp = NULL;
3318 struct svc_fh *current_fh = &cstate->current_fh;
3319 struct inode *ino = current_fh->fh_dentry->d_inode;
3325 if (grace_disallows_io(ino))
3326 return nfserr_grace;
3328 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3329 return check_special_stateids(current_fh, stateid, flags);
3331 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
3334 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3337 switch (s->sc_type) {
3338 case NFS4_DELEG_STID:
3339 dp = delegstateid(s);
3340 status = nfs4_check_delegmode(dp, flags);
3344 *filpp = dp->dl_file->fi_deleg_file;
3348 case NFS4_OPEN_STID:
3349 case NFS4_LOCK_STID:
3350 stp = openlockstateid(s);
3351 status = nfs4_check_fh(current_fh, stp);
3354 if (stp->st_stateowner->so_is_open_owner
3355 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3357 status = nfs4_check_openmode(stp, flags);
3361 if (flags & RD_STATE)
3362 *filpp = find_readable_file(stp->st_file);
3364 *filpp = find_writeable_file(stp->st_file);
3368 return nfserr_bad_stateid;
3376 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3378 if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3379 return nfserr_locks_held;
3380 release_lock_stateid(stp);
3385 * Test if the stateid is valid
3388 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3389 struct nfsd4_test_stateid *test_stateid)
3391 /* real work is done during encoding */
3396 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3397 struct nfsd4_free_stateid *free_stateid)
3399 stateid_t *stateid = &free_stateid->fr_stateid;
3400 struct nfs4_stid *s;
3401 struct nfs4_client *cl = cstate->session->se_client;
3402 __be32 ret = nfserr_bad_stateid;
3405 s = find_stateid(cl, stateid);
3408 switch (s->sc_type) {
3409 case NFS4_DELEG_STID:
3410 ret = nfserr_locks_held;
3412 case NFS4_OPEN_STID:
3413 case NFS4_LOCK_STID:
3414 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3417 if (s->sc_type == NFS4_LOCK_STID)
3418 ret = nfsd4_free_lock_stateid(openlockstateid(s));
3420 ret = nfserr_locks_held;
3423 ret = nfserr_bad_stateid;
3426 nfs4_unlock_state();
3433 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3434 RD_STATE : WR_STATE;
3437 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3439 struct svc_fh *current_fh = &cstate->current_fh;
3440 struct nfs4_stateowner *sop = stp->st_stateowner;
3443 status = nfsd4_check_seqid(cstate, sop, seqid);
3446 if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3448 * "Closed" stateid's exist *only* to return
3449 * nfserr_replay_me from the previous step.
3451 return nfserr_bad_stateid;
3452 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3455 return nfs4_check_fh(current_fh, stp);
3459 * Checks for sequence id mutating operations.
3462 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3463 stateid_t *stateid, char typemask,
3464 struct nfs4_ol_stateid **stpp)
3467 struct nfs4_stid *s;
3469 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3470 seqid, STATEID_VAL(stateid));
3473 status = nfsd4_lookup_stateid(stateid, typemask, &s);
3476 *stpp = openlockstateid(s);
3477 cstate->replay_owner = (*stpp)->st_stateowner;
3479 return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3482 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
3485 struct nfs4_openowner *oo;
3487 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3488 NFS4_OPEN_STID, stpp);
3491 oo = openowner((*stpp)->st_stateowner);
3492 if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3493 return nfserr_bad_stateid;
3498 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3499 struct nfsd4_open_confirm *oc)
3502 struct nfs4_openowner *oo;
3503 struct nfs4_ol_stateid *stp;
3505 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3506 (int)cstate->current_fh.fh_dentry->d_name.len,
3507 cstate->current_fh.fh_dentry->d_name.name);
3509 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3515 status = nfs4_preprocess_seqid_op(cstate,
3516 oc->oc_seqid, &oc->oc_req_stateid,
3517 NFS4_OPEN_STID, &stp);
3520 oo = openowner(stp->st_stateowner);
3521 status = nfserr_bad_stateid;
3522 if (oo->oo_flags & NFS4_OO_CONFIRMED)
3524 oo->oo_flags |= NFS4_OO_CONFIRMED;
3525 update_stateid(&stp->st_stid.sc_stateid);
3526 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3527 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3528 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3530 nfsd4_create_clid_dir(oo->oo_owner.so_client);
3533 if (!cstate->replay_owner)
3534 nfs4_unlock_state();
3538 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3540 if (!test_bit(access, &stp->st_access_bmap))
3542 nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3543 __clear_bit(access, &stp->st_access_bmap);
3546 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3548 switch (to_access) {
3549 case NFS4_SHARE_ACCESS_READ:
3550 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3551 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3553 case NFS4_SHARE_ACCESS_WRITE:
3554 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3555 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3557 case NFS4_SHARE_ACCESS_BOTH:
3565 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3568 for (i = 0; i < 4; i++) {
3569 if ((i & deny) != i)
3570 __clear_bit(i, bmap);
3575 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3576 struct nfsd4_compound_state *cstate,
3577 struct nfsd4_open_downgrade *od)
3580 struct nfs4_ol_stateid *stp;
3582 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3583 (int)cstate->current_fh.fh_dentry->d_name.len,
3584 cstate->current_fh.fh_dentry->d_name.name);
3586 /* We don't yet support WANT bits: */
3587 od->od_share_access &= NFS4_SHARE_ACCESS_MASK;
3590 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3591 &od->od_stateid, &stp);
3594 status = nfserr_inval;
3595 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3596 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3597 stp->st_access_bmap, od->od_share_access);
3600 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3601 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3602 stp->st_deny_bmap, od->od_share_deny);
3605 nfs4_stateid_downgrade(stp, od->od_share_access);
3607 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3609 update_stateid(&stp->st_stid.sc_stateid);
3610 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3613 if (!cstate->replay_owner)
3614 nfs4_unlock_state();
3618 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3620 struct nfs4_openowner *oo;
3621 struct nfs4_ol_stateid *s;
3623 if (!so->so_is_open_owner)
3626 s = oo->oo_last_closed_stid;
3629 if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3630 /* Release the last_closed_stid on the next seqid bump: */
3631 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3634 oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3635 release_last_closed_stateid(oo);
3638 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3640 unhash_open_stateid(s);
3641 s->st_stid.sc_type = NFS4_CLOSED_STID;
3645 * nfs4_unlock_state() called after encode
3648 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3649 struct nfsd4_close *close)
3652 struct nfs4_openowner *oo;
3653 struct nfs4_ol_stateid *stp;
3655 dprintk("NFSD: nfsd4_close on file %.*s\n",
3656 (int)cstate->current_fh.fh_dentry->d_name.len,
3657 cstate->current_fh.fh_dentry->d_name.name);
3660 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3662 NFS4_OPEN_STID|NFS4_CLOSED_STID,
3666 oo = openowner(stp->st_stateowner);
3668 update_stateid(&stp->st_stid.sc_stateid);
3669 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3671 nfsd4_close_open_stateid(stp);
3672 release_last_closed_stateid(oo);
3673 oo->oo_last_closed_stid = stp;
3675 /* place unused nfs4_stateowners on so_close_lru list to be
3676 * released by the laundromat service after the lease period
3677 * to enable us to handle CLOSE replay
3679 if (list_empty(&oo->oo_owner.so_stateids))
3680 move_to_close_lru(oo);
3682 if (!cstate->replay_owner)
3683 nfs4_unlock_state();
3688 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3689 struct nfsd4_delegreturn *dr)
3691 struct nfs4_delegation *dp;
3692 stateid_t *stateid = &dr->dr_stateid;
3693 struct nfs4_stid *s;
3694 struct inode *inode;
3697 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3699 inode = cstate->current_fh.fh_dentry->d_inode;
3702 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s);
3705 dp = delegstateid(s);
3706 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3710 unhash_delegation(dp);
3712 nfs4_unlock_state();
3719 * Lock owner state (byte-range locks)
3721 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3722 #define LOCK_HASH_BITS 8
3723 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3724 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3727 end_offset(u64 start, u64 len)
3732 return end >= start ? end: NFS4_MAX_UINT64;
3735 /* last octet in a range */
3737 last_byte_offset(u64 start, u64 len)
3743 return end > start ? end - 1: NFS4_MAX_UINT64;
3746 static inline unsigned int
3747 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3748 struct xdr_netobj *ownername)
3750 return (file_hashval(inode) + cl_id
3751 + opaque_hashval(ownername->data, ownername->len))
3755 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3758 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3759 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3760 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3761 * locking, this prevents us from being completely protocol-compliant. The
3762 * real solution to this problem is to start using unsigned file offsets in
3763 * the VFS, but this is a very deep change!
3766 nfs4_transform_lock_offset(struct file_lock *lock)
3768 if (lock->fl_start < 0)
3769 lock->fl_start = OFFSET_MAX;
3770 if (lock->fl_end < 0)
3771 lock->fl_end = OFFSET_MAX;
3774 /* Hack!: For now, we're defining this just so we can use a pointer to it
3775 * as a unique cookie to identify our (NFSv4's) posix locks. */
3776 static const struct lock_manager_operations nfsd_posix_mng_ops = {
3780 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3782 struct nfs4_lockowner *lo;
3784 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3785 lo = (struct nfs4_lockowner *) fl->fl_owner;
3786 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3787 lo->lo_owner.so_owner.len, GFP_KERNEL);
3788 if (!deny->ld_owner.data)
3789 /* We just don't care that much */
3791 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3792 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3795 deny->ld_owner.len = 0;
3796 deny->ld_owner.data = NULL;
3797 deny->ld_clientid.cl_boot = 0;
3798 deny->ld_clientid.cl_id = 0;
3800 deny->ld_start = fl->fl_start;
3801 deny->ld_length = NFS4_MAX_UINT64;
3802 if (fl->fl_end != NFS4_MAX_UINT64)
3803 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3804 deny->ld_type = NFS4_READ_LT;
3805 if (fl->fl_type != F_RDLCK)
3806 deny->ld_type = NFS4_WRITE_LT;
3809 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3811 struct nfs4_ol_stateid *lst;
3813 if (!same_owner_str(&lo->lo_owner, owner, clid))
3815 lst = list_first_entry(&lo->lo_owner.so_stateids,
3816 struct nfs4_ol_stateid, st_perstateowner);
3817 return lst->st_file->fi_inode == inode;
3820 static struct nfs4_lockowner *
3821 find_lockowner_str(struct inode *inode, clientid_t *clid,
3822 struct xdr_netobj *owner)
3824 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3825 struct nfs4_lockowner *lo;
3826 struct nfs4_stateowner *op;
3828 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
3830 if (same_lockowner_ino(lo, inode, clid, owner))
3836 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3838 list_add(&lo->lo_owner.so_strhash, &lock_ownerstr_hashtbl[strhashval]);
3839 list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3843 * Alloc a lock owner structure.
3844 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3847 * strhashval = lock_ownerstr_hashval
3850 static struct nfs4_lockowner *
3851 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
3852 struct nfs4_lockowner *lo;
3854 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
3857 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
3858 lo->lo_owner.so_is_open_owner = 0;
3859 /* It is the openowner seqid that will be incremented in encode in the
3860 * case of new lockowners; so increment the lock seqid manually: */
3861 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
3862 hash_lockowner(lo, strhashval, clp, open_stp);
3866 static struct nfs4_ol_stateid *
3867 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
3869 struct nfs4_ol_stateid *stp;
3870 struct nfs4_client *clp = lo->lo_owner.so_client;
3872 stp = nfs4_alloc_stateid(clp);
3875 init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
3876 list_add(&stp->st_perfile, &fp->fi_stateids);
3877 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
3878 stp->st_stateowner = &lo->lo_owner;
3881 stp->st_access_bmap = 0;
3882 stp->st_deny_bmap = open_stp->st_deny_bmap;
3883 stp->st_openstp = open_stp;
3888 check_lock_length(u64 offset, u64 length)
3890 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
3891 LOFF_OVERFLOW(offset, length)));
3894 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
3896 struct nfs4_file *fp = lock_stp->st_file;
3897 int oflag = nfs4_access_to_omode(access);
3899 if (test_bit(access, &lock_stp->st_access_bmap))
3901 nfs4_file_get_access(fp, oflag);
3902 __set_bit(access, &lock_stp->st_access_bmap);
3909 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3910 struct nfsd4_lock *lock)
3912 struct nfs4_openowner *open_sop = NULL;
3913 struct nfs4_lockowner *lock_sop = NULL;
3914 struct nfs4_ol_stateid *lock_stp;
3915 struct nfs4_file *fp;
3916 struct file *filp = NULL;
3917 struct file_lock file_lock;
3918 struct file_lock conflock;
3920 unsigned int strhashval;
3924 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3925 (long long) lock->lk_offset,
3926 (long long) lock->lk_length);
3928 if (check_lock_length(lock->lk_offset, lock->lk_length))
3929 return nfserr_inval;
3931 if ((status = fh_verify(rqstp, &cstate->current_fh,
3932 S_IFREG, NFSD_MAY_LOCK))) {
3933 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3939 if (lock->lk_is_new) {
3941 * Client indicates that this is a new lockowner.
3942 * Use open owner and open stateid to create lock owner and
3945 struct nfs4_ol_stateid *open_stp = NULL;
3947 status = nfserr_stale_clientid;
3948 if (!nfsd4_has_session(cstate) &&
3949 STALE_CLIENTID(&lock->lk_new_clientid))
3952 /* validate and update open stateid and open seqid */
3953 status = nfs4_preprocess_confirmed_seqid_op(cstate,
3954 lock->lk_new_open_seqid,
3955 &lock->lk_new_open_stateid,
3959 open_sop = openowner(open_stp->st_stateowner);
3960 status = nfserr_bad_stateid;
3961 if (!nfsd4_has_session(cstate) &&
3962 !same_clid(&open_sop->oo_owner.so_client->cl_clientid,
3963 &lock->v.new.clientid))
3965 /* create lockowner and lock stateid */
3966 fp = open_stp->st_file;
3967 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3968 open_sop->oo_owner.so_client->cl_clientid.cl_id,
3969 &lock->v.new.owner);
3970 /* XXX: Do we need to check for duplicate stateowners on
3971 * the same file, or should they just be allowed (and
3972 * create new stateids)? */
3973 status = nfserr_jukebox;
3974 lock_sop = alloc_init_lock_stateowner(strhashval,
3975 open_sop->oo_owner.so_client, open_stp, lock);
3976 if (lock_sop == NULL)
3978 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
3979 if (lock_stp == NULL)
3982 /* lock (lock owner + lock stateid) already exists */
3983 status = nfs4_preprocess_seqid_op(cstate,
3984 lock->lk_old_lock_seqid,
3985 &lock->lk_old_lock_stateid,
3986 NFS4_LOCK_STID, &lock_stp);
3989 lock_sop = lockowner(lock_stp->st_stateowner);
3990 fp = lock_stp->st_file;
3992 /* lock_sop and lock_stp have been created or found */
3994 lkflg = setlkflg(lock->lk_type);
3995 status = nfs4_check_openmode(lock_stp, lkflg);
3999 status = nfserr_grace;
4000 if (locks_in_grace() && !lock->lk_reclaim)
4002 status = nfserr_no_grace;
4003 if (!locks_in_grace() && lock->lk_reclaim)
4006 locks_init_lock(&file_lock);
4007 switch (lock->lk_type) {
4010 filp = find_readable_file(lock_stp->st_file);
4012 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4013 file_lock.fl_type = F_RDLCK;
4016 case NFS4_WRITEW_LT:
4017 filp = find_writeable_file(lock_stp->st_file);
4019 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4020 file_lock.fl_type = F_WRLCK;
4023 status = nfserr_inval;
4027 status = nfserr_openmode;
4030 file_lock.fl_owner = (fl_owner_t)lock_sop;
4031 file_lock.fl_pid = current->tgid;
4032 file_lock.fl_file = filp;
4033 file_lock.fl_flags = FL_POSIX;
4034 file_lock.fl_lmops = &nfsd_posix_mng_ops;
4036 file_lock.fl_start = lock->lk_offset;
4037 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4038 nfs4_transform_lock_offset(&file_lock);
4041 * Try to lock the file in the VFS.
4042 * Note: locks.c uses the BKL to protect the inode's lock list.
4045 err = vfs_lock_file(filp, F_SETLK, &file_lock, &conflock);
4047 case 0: /* success! */
4048 update_stateid(&lock_stp->st_stid.sc_stateid);
4049 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4053 case (EAGAIN): /* conflock holds conflicting lock */
4054 status = nfserr_denied;
4055 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4056 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
4059 status = nfserr_deadlock;
4062 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4063 status = nfserrno(err);
4067 if (status && lock->lk_is_new && lock_sop)
4068 release_lockowner(lock_sop);
4069 if (!cstate->replay_owner)
4070 nfs4_unlock_state();
4075 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4076 * so we do a temporary open here just to get an open file to pass to
4077 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
4080 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4083 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4085 err = nfserrno(vfs_test_lock(file, lock));
4095 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4096 struct nfsd4_lockt *lockt)
4098 struct inode *inode;
4099 struct file_lock file_lock;
4100 struct nfs4_lockowner *lo;
4103 if (locks_in_grace())
4104 return nfserr_grace;
4106 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4107 return nfserr_inval;
4111 status = nfserr_stale_clientid;
4112 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
4115 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4118 inode = cstate->current_fh.fh_dentry->d_inode;
4119 locks_init_lock(&file_lock);
4120 switch (lockt->lt_type) {
4123 file_lock.fl_type = F_RDLCK;
4126 case NFS4_WRITEW_LT:
4127 file_lock.fl_type = F_WRLCK;
4130 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4131 status = nfserr_inval;
4135 lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4137 file_lock.fl_owner = (fl_owner_t)lo;
4138 file_lock.fl_pid = current->tgid;
4139 file_lock.fl_flags = FL_POSIX;
4141 file_lock.fl_start = lockt->lt_offset;
4142 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4144 nfs4_transform_lock_offset(&file_lock);
4146 status = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
4150 if (file_lock.fl_type != F_UNLCK) {
4151 status = nfserr_denied;
4152 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
4155 nfs4_unlock_state();
4160 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4161 struct nfsd4_locku *locku)
4163 struct nfs4_ol_stateid *stp;
4164 struct file *filp = NULL;
4165 struct file_lock file_lock;
4169 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4170 (long long) locku->lu_offset,
4171 (long long) locku->lu_length);
4173 if (check_lock_length(locku->lu_offset, locku->lu_length))
4174 return nfserr_inval;
4178 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4179 &locku->lu_stateid, NFS4_LOCK_STID, &stp);
4182 filp = find_any_file(stp->st_file);
4184 status = nfserr_lock_range;
4188 locks_init_lock(&file_lock);
4189 file_lock.fl_type = F_UNLCK;
4190 file_lock.fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4191 file_lock.fl_pid = current->tgid;
4192 file_lock.fl_file = filp;
4193 file_lock.fl_flags = FL_POSIX;
4194 file_lock.fl_lmops = &nfsd_posix_mng_ops;
4195 file_lock.fl_start = locku->lu_offset;
4197 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
4198 nfs4_transform_lock_offset(&file_lock);
4201 * Try to unlock the file in the VFS.
4203 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
4205 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4209 * OK, unlock succeeded; the only thing left to do is update the stateid.
4211 update_stateid(&stp->st_stid.sc_stateid);
4212 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4215 if (!cstate->replay_owner)
4216 nfs4_unlock_state();
4220 status = nfserrno(err);
4226 * 1: locks held by lockowner
4227 * 0: no locks held by lockowner
4230 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4232 struct file_lock **flpp;
4233 struct inode *inode = filp->fi_inode;
4237 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4238 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4249 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4250 struct nfsd4_compound_state *cstate,
4251 struct nfsd4_release_lockowner *rlockowner)
4253 clientid_t *clid = &rlockowner->rl_clientid;
4254 struct nfs4_stateowner *sop;
4255 struct nfs4_lockowner *lo;
4256 struct nfs4_ol_stateid *stp;
4257 struct xdr_netobj *owner = &rlockowner->rl_owner;
4258 struct list_head matches;
4262 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4263 clid->cl_boot, clid->cl_id);
4265 /* XXX check for lease expiration */
4267 status = nfserr_stale_clientid;
4268 if (STALE_CLIENTID(clid))
4273 status = nfserr_locks_held;
4274 /* XXX: we're doing a linear search through all the lockowners.
4275 * Yipes! For now we'll just hope clients aren't really using
4276 * release_lockowner much, but eventually we have to fix these
4277 * data structures. */
4278 INIT_LIST_HEAD(&matches);
4279 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4280 list_for_each_entry(sop, &lock_ownerstr_hashtbl[i], so_strhash) {
4281 if (!same_owner_str(sop, owner, clid))
4283 list_for_each_entry(stp, &sop->so_stateids,
4285 lo = lockowner(sop);
4286 if (check_for_locks(stp->st_file, lo))
4288 list_add(&lo->lo_list, &matches);
4292 /* Clients probably won't expect us to return with some (but not all)
4293 * of the lockowner state released; so don't release any until all
4294 * have been checked. */
4296 while (!list_empty(&matches)) {
4297 lo = list_entry(matches.next, struct nfs4_lockowner,
4299 /* unhash_stateowner deletes so_perclient only
4300 * for openowners. */
4301 list_del(&lo->lo_list);
4302 release_lockowner(lo);
4305 nfs4_unlock_state();
4309 static inline struct nfs4_client_reclaim *
4312 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4316 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
4318 unsigned int strhashval = clientstr_hashval(name);
4319 struct nfs4_client *clp;
4321 clp = find_confirmed_client_by_str(name, strhashval);
4326 * failure => all reset bets are off, nfserr_no_grace...
4329 nfs4_client_to_reclaim(const char *name)
4331 unsigned int strhashval;
4332 struct nfs4_client_reclaim *crp = NULL;
4334 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4335 crp = alloc_reclaim();
4338 strhashval = clientstr_hashval(name);
4339 INIT_LIST_HEAD(&crp->cr_strhash);
4340 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4341 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4342 reclaim_str_hashtbl_size++;
4347 nfs4_release_reclaim(void)
4349 struct nfs4_client_reclaim *crp = NULL;
4352 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4353 while (!list_empty(&reclaim_str_hashtbl[i])) {
4354 crp = list_entry(reclaim_str_hashtbl[i].next,
4355 struct nfs4_client_reclaim, cr_strhash);
4356 list_del(&crp->cr_strhash);
4358 reclaim_str_hashtbl_size--;
4361 BUG_ON(reclaim_str_hashtbl_size);
4365 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4366 static struct nfs4_client_reclaim *
4367 nfs4_find_reclaim_client(clientid_t *clid)
4369 unsigned int strhashval;
4370 struct nfs4_client *clp;
4371 struct nfs4_client_reclaim *crp = NULL;
4374 /* find clientid in conf_id_hashtbl */
4375 clp = find_confirmed_client(clid);
4379 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4380 clp->cl_name.len, clp->cl_name.data,
4383 /* find clp->cl_name in reclaim_str_hashtbl */
4384 strhashval = clientstr_hashval(clp->cl_recdir);
4385 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4386 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
4394 * Called from OPEN. Look for clientid in reclaim list.
4397 nfs4_check_open_reclaim(clientid_t *clid)
4399 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
4402 /* initialization to perform at module load time: */
4405 nfs4_state_init(void)
4409 status = nfsd4_init_slabs();
4412 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4413 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4414 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4415 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4416 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4417 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4419 for (i = 0; i < SESSION_HASH_SIZE; i++)
4420 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4421 for (i = 0; i < FILE_HASH_SIZE; i++) {
4422 INIT_LIST_HEAD(&file_hashtbl[i]);
4424 for (i = 0; i < OPEN_OWNER_HASH_SIZE; i++) {
4425 INIT_LIST_HEAD(&open_ownerstr_hashtbl[i]);
4427 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4428 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4430 memset(&onestateid, ~0, sizeof(stateid_t));
4431 INIT_LIST_HEAD(&close_lru);
4432 INIT_LIST_HEAD(&client_lru);
4433 INIT_LIST_HEAD(&del_recall_lru);
4434 reclaim_str_hashtbl_size = 0;
4439 nfsd4_load_reboot_recovery_data(void)
4444 nfsd4_init_recdir();
4445 status = nfsd4_recdir_load();
4446 nfs4_unlock_state();
4448 printk("NFSD: Failure reading reboot recovery data\n");
4452 * Since the lifetime of a delegation isn't limited to that of an open, a
4453 * client may quite reasonably hang on to a delegation as long as it has
4454 * the inode cached. This becomes an obvious problem the first time a
4455 * client's inode cache approaches the size of the server's total memory.
4457 * For now we avoid this problem by imposing a hard limit on the number
4458 * of delegations, which varies according to the server's memory size.
4461 set_max_delegations(void)
4464 * Allow at most 4 delegations per megabyte of RAM. Quick
4465 * estimates suggest that in the worst case (where every delegation
4466 * is for a different inode), a delegation could take about 1.5K,
4467 * giving a worst case usage of about 6% of memory.
4469 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4472 /* initialization to perform when the nfsd service is started: */
4475 __nfs4_state_start(void)
4479 boot_time = get_seconds();
4480 locks_start_grace(&nfsd4_manager);
4481 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4483 ret = set_callback_cred();
4486 laundry_wq = create_singlethread_workqueue("nfsd4");
4487 if (laundry_wq == NULL)
4489 ret = nfsd4_create_callback_queue();
4491 goto out_free_laundry;
4492 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4493 set_max_delegations();
4496 destroy_workqueue(laundry_wq);
4501 nfs4_state_start(void)
4503 nfsd4_load_reboot_recovery_data();
4504 return __nfs4_state_start();
4508 __nfs4_state_shutdown(void)
4511 struct nfs4_client *clp = NULL;
4512 struct nfs4_delegation *dp = NULL;
4513 struct list_head *pos, *next, reaplist;
4515 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4516 while (!list_empty(&conf_id_hashtbl[i])) {
4517 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4520 while (!list_empty(&unconf_str_hashtbl[i])) {
4521 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4525 INIT_LIST_HEAD(&reaplist);
4526 spin_lock(&recall_lock);
4527 list_for_each_safe(pos, next, &del_recall_lru) {
4528 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4529 list_move(&dp->dl_recall_lru, &reaplist);
4531 spin_unlock(&recall_lock);
4532 list_for_each_safe(pos, next, &reaplist) {
4533 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4534 list_del_init(&dp->dl_recall_lru);
4535 unhash_delegation(dp);
4538 nfsd4_shutdown_recdir();
4542 nfs4_state_shutdown(void)
4544 cancel_delayed_work_sync(&laundromat_work);
4545 destroy_workqueue(laundry_wq);
4546 locks_end_grace(&nfsd4_manager);
4548 nfs4_release_reclaim();
4549 __nfs4_state_shutdown();
4550 nfs4_unlock_state();
4551 nfsd4_destroy_callback_queue();