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/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
47 #include "current_stateid.h"
51 #define NFSDDBG_FACILITY NFSDDBG_PROC
53 #define all_ones {{~0,~0},~0}
54 static const stateid_t one_stateid = {
56 .si_opaque = all_ones,
58 static const stateid_t zero_stateid = {
61 static const stateid_t currentstateid = {
65 static u64 current_sessionid = 1;
67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
68 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
69 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
71 /* forward declarations */
72 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
76 /* Currently used for almost all code touching nfsv4 state: */
77 static DEFINE_MUTEX(client_mutex);
80 * Currently used for the del_recall_lru and file hash table. In an
81 * effort to decrease the scope of the client_mutex, this spinlock may
82 * eventually cover more:
84 static DEFINE_SPINLOCK(recall_lock);
86 static struct kmem_cache *openowner_slab = NULL;
87 static struct kmem_cache *lockowner_slab = NULL;
88 static struct kmem_cache *file_slab = NULL;
89 static struct kmem_cache *stateid_slab = NULL;
90 static struct kmem_cache *deleg_slab = NULL;
95 mutex_lock(&client_mutex);
98 static void free_session(struct nfsd4_session *);
100 void nfsd4_put_session(struct nfsd4_session *ses)
102 atomic_dec(&ses->se_ref);
105 static bool is_session_dead(struct nfsd4_session *ses)
107 return ses->se_flags & NFS4_SESSION_DEAD;
110 static __be32 mark_session_dead_locked(struct nfsd4_session *ses)
112 if (atomic_read(&ses->se_ref))
113 return nfserr_jukebox;
114 ses->se_flags |= NFS4_SESSION_DEAD;
118 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
120 if (is_session_dead(ses))
121 return nfserr_badsession;
122 atomic_inc(&ses->se_ref);
127 nfs4_unlock_state(void)
129 mutex_unlock(&client_mutex);
132 static bool is_client_expired(struct nfs4_client *clp)
134 return clp->cl_time == 0;
137 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
139 if (atomic_read(&clp->cl_refcount))
140 return nfserr_jukebox;
145 static __be32 mark_client_expired(struct nfs4_client *clp)
147 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
150 spin_lock(&nn->client_lock);
151 ret = mark_client_expired_locked(clp);
152 spin_unlock(&nn->client_lock);
156 static __be32 get_client_locked(struct nfs4_client *clp)
158 if (is_client_expired(clp))
159 return nfserr_expired;
160 atomic_inc(&clp->cl_refcount);
164 /* must be called under the client_lock */
166 renew_client_locked(struct nfs4_client *clp)
168 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
170 if (is_client_expired(clp)) {
172 printk("%s: client (clientid %08x/%08x) already expired\n",
174 clp->cl_clientid.cl_boot,
175 clp->cl_clientid.cl_id);
179 dprintk("renewing client (clientid %08x/%08x)\n",
180 clp->cl_clientid.cl_boot,
181 clp->cl_clientid.cl_id);
182 list_move_tail(&clp->cl_lru, &nn->client_lru);
183 clp->cl_time = get_seconds();
187 renew_client(struct nfs4_client *clp)
189 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
191 spin_lock(&nn->client_lock);
192 renew_client_locked(clp);
193 spin_unlock(&nn->client_lock);
196 static void put_client_renew_locked(struct nfs4_client *clp)
198 if (!atomic_dec_and_test(&clp->cl_refcount))
200 if (!is_client_expired(clp))
201 renew_client_locked(clp);
204 void put_client_renew(struct nfs4_client *clp)
206 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
208 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
210 if (!is_client_expired(clp))
211 renew_client_locked(clp);
212 spin_unlock(&nn->client_lock);
217 opaque_hashval(const void *ptr, int nbytes)
219 unsigned char *cptr = (unsigned char *) ptr;
229 static void nfsd4_free_file(struct nfs4_file *f)
231 kmem_cache_free(file_slab, f);
235 put_nfs4_file(struct nfs4_file *fi)
237 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
238 hlist_del(&fi->fi_hash);
239 spin_unlock(&recall_lock);
246 get_nfs4_file(struct nfs4_file *fi)
248 atomic_inc(&fi->fi_ref);
251 static int num_delegations;
252 unsigned long max_delegations;
255 * Open owner state (share locks)
258 /* hash tables for lock and open owners */
259 #define OWNER_HASH_BITS 8
260 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
261 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
263 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
267 ret = opaque_hashval(ownername->data, ownername->len);
269 return ret & OWNER_HASH_MASK;
272 /* hash table for nfs4_file */
273 #define FILE_HASH_BITS 8
274 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
276 static unsigned int file_hashval(struct inode *ino)
278 /* XXX: why are we hashing on inode pointer, anyway? */
279 return hash_ptr(ino, FILE_HASH_BITS);
282 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
284 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
286 WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
287 atomic_inc(&fp->fi_access[oflag]);
290 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
292 if (oflag == O_RDWR) {
293 __nfs4_file_get_access(fp, O_RDONLY);
294 __nfs4_file_get_access(fp, O_WRONLY);
296 __nfs4_file_get_access(fp, oflag);
299 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
301 if (fp->fi_fds[oflag]) {
302 fput(fp->fi_fds[oflag]);
303 fp->fi_fds[oflag] = NULL;
307 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
309 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
310 nfs4_file_put_fd(fp, oflag);
311 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
312 nfs4_file_put_fd(fp, O_RDWR);
316 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
318 if (oflag == O_RDWR) {
319 __nfs4_file_put_access(fp, O_RDONLY);
320 __nfs4_file_put_access(fp, O_WRONLY);
322 __nfs4_file_put_access(fp, oflag);
325 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
328 struct idr *stateids = &cl->cl_stateids;
329 struct nfs4_stid *stid;
332 stid = kmem_cache_alloc(slab, GFP_KERNEL);
336 new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
339 stid->sc_client = cl;
341 stid->sc_stateid.si_opaque.so_id = new_id;
342 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
343 /* Will be incremented before return to client: */
344 stid->sc_stateid.si_generation = 0;
347 * It shouldn't be a problem to reuse an opaque stateid value.
348 * I don't think it is for 4.1. But with 4.0 I worry that, for
349 * example, a stray write retransmission could be accepted by
350 * the server when it should have been rejected. Therefore,
351 * adopt a trick from the sctp code to attempt to maximize the
352 * amount of time until an id is reused, by ensuring they always
353 * "increase" (mod INT_MAX):
357 kmem_cache_free(slab, stid);
361 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
363 return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
366 static struct nfs4_delegation *
367 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
369 struct nfs4_delegation *dp;
371 dprintk("NFSD alloc_init_deleg\n");
373 * Major work on the lease subsystem (for example, to support
374 * calbacks on stat) will be required before we can support
375 * write delegations properly.
377 if (type != NFS4_OPEN_DELEGATE_READ)
379 if (num_delegations > max_delegations)
381 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
384 dp->dl_stid.sc_type = NFS4_DELEG_STID;
386 * delegation seqid's are never incremented. The 4.1 special
387 * meaning of seqid 0 isn't meaningful, really, but let's avoid
388 * 0 anyway just for consistency and use 1:
390 dp->dl_stid.sc_stateid.si_generation = 1;
392 INIT_LIST_HEAD(&dp->dl_perfile);
393 INIT_LIST_HEAD(&dp->dl_perclnt);
394 INIT_LIST_HEAD(&dp->dl_recall_lru);
397 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
399 atomic_set(&dp->dl_count, 1);
400 nfsd4_init_callback(&dp->dl_recall);
404 static void remove_stid(struct nfs4_stid *s)
406 struct idr *stateids = &s->sc_client->cl_stateids;
408 idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
412 nfs4_put_delegation(struct nfs4_delegation *dp)
414 if (atomic_dec_and_test(&dp->dl_count)) {
415 kmem_cache_free(deleg_slab, dp);
420 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
422 if (atomic_dec_and_test(&fp->fi_delegees)) {
423 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
425 fput(fp->fi_deleg_file);
426 fp->fi_deleg_file = NULL;
430 static void unhash_stid(struct nfs4_stid *s)
435 /* Called under the state lock. */
437 unhash_delegation(struct nfs4_delegation *dp)
439 list_del_init(&dp->dl_perclnt);
440 spin_lock(&recall_lock);
441 list_del_init(&dp->dl_perfile);
442 list_del_init(&dp->dl_recall_lru);
443 spin_unlock(&recall_lock);
444 nfs4_put_deleg_lease(dp->dl_file);
445 put_nfs4_file(dp->dl_file);
451 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
453 list_del_init(&dp->dl_recall_lru);
454 remove_stid(&dp->dl_stid);
455 nfs4_put_delegation(dp);
458 static void destroy_delegation(struct nfs4_delegation *dp)
460 unhash_delegation(dp);
461 remove_stid(&dp->dl_stid);
462 nfs4_put_delegation(dp);
465 static void revoke_delegation(struct nfs4_delegation *dp)
467 struct nfs4_client *clp = dp->dl_stid.sc_client;
469 if (clp->cl_minorversion == 0)
470 destroy_delegation(dp);
472 unhash_delegation(dp);
473 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
474 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
482 static unsigned int clientid_hashval(u32 id)
484 return id & CLIENT_HASH_MASK;
487 static unsigned int clientstr_hashval(const char *name)
489 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
493 * We store the NONE, READ, WRITE, and BOTH bits separately in the
494 * st_{access,deny}_bmap field of the stateid, in order to track not
495 * only what share bits are currently in force, but also what
496 * combinations of share bits previous opens have used. This allows us
497 * to enforce the recommendation of rfc 3530 14.2.19 that the server
498 * return an error if the client attempt to downgrade to a combination
499 * of share bits not explicable by closing some of its previous opens.
501 * XXX: This enforcement is actually incomplete, since we don't keep
502 * track of access/deny bit combinations; so, e.g., we allow:
504 * OPEN allow read, deny write
505 * OPEN allow both, deny none
506 * DOWNGRADE allow read, deny none
508 * which we should reject.
511 bmap_to_share_mode(unsigned long bmap) {
513 unsigned int access = 0;
515 for (i = 1; i < 4; i++) {
516 if (test_bit(i, &bmap))
523 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
524 unsigned int access, deny;
526 access = bmap_to_share_mode(stp->st_access_bmap);
527 deny = bmap_to_share_mode(stp->st_deny_bmap);
528 if ((access & open->op_share_deny) || (deny & open->op_share_access))
533 /* set share access for a given stateid */
535 set_access(u32 access, struct nfs4_ol_stateid *stp)
537 __set_bit(access, &stp->st_access_bmap);
540 /* clear share access for a given stateid */
542 clear_access(u32 access, struct nfs4_ol_stateid *stp)
544 __clear_bit(access, &stp->st_access_bmap);
547 /* test whether a given stateid has access */
549 test_access(u32 access, struct nfs4_ol_stateid *stp)
551 return test_bit(access, &stp->st_access_bmap);
554 /* set share deny for a given stateid */
556 set_deny(u32 access, struct nfs4_ol_stateid *stp)
558 __set_bit(access, &stp->st_deny_bmap);
561 /* clear share deny for a given stateid */
563 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
565 __clear_bit(access, &stp->st_deny_bmap);
568 /* test whether a given stateid is denying specific access */
570 test_deny(u32 access, struct nfs4_ol_stateid *stp)
572 return test_bit(access, &stp->st_deny_bmap);
575 static int nfs4_access_to_omode(u32 access)
577 switch (access & NFS4_SHARE_ACCESS_BOTH) {
578 case NFS4_SHARE_ACCESS_READ:
580 case NFS4_SHARE_ACCESS_WRITE:
582 case NFS4_SHARE_ACCESS_BOTH:
589 /* release all access and file references for a given stateid */
591 release_all_access(struct nfs4_ol_stateid *stp)
595 for (i = 1; i < 4; i++) {
596 if (test_access(i, stp))
597 nfs4_file_put_access(stp->st_file,
598 nfs4_access_to_omode(i));
599 clear_access(i, stp);
603 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
605 list_del(&stp->st_perfile);
606 list_del(&stp->st_perstateowner);
609 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
611 release_all_access(stp);
612 put_nfs4_file(stp->st_file);
616 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
618 remove_stid(&stp->st_stid);
619 kmem_cache_free(stateid_slab, stp);
622 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
626 unhash_generic_stateid(stp);
627 unhash_stid(&stp->st_stid);
628 file = find_any_file(stp->st_file);
630 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
631 close_generic_stateid(stp);
632 free_generic_stateid(stp);
635 static void unhash_lockowner(struct nfs4_lockowner *lo)
637 struct nfs4_ol_stateid *stp;
639 list_del(&lo->lo_owner.so_strhash);
640 list_del(&lo->lo_perstateid);
641 list_del(&lo->lo_owner_ino_hash);
642 while (!list_empty(&lo->lo_owner.so_stateids)) {
643 stp = list_first_entry(&lo->lo_owner.so_stateids,
644 struct nfs4_ol_stateid, st_perstateowner);
645 release_lock_stateid(stp);
649 static void release_lockowner(struct nfs4_lockowner *lo)
651 unhash_lockowner(lo);
652 nfs4_free_lockowner(lo);
656 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
658 struct nfs4_lockowner *lo;
660 while (!list_empty(&open_stp->st_lockowners)) {
661 lo = list_entry(open_stp->st_lockowners.next,
662 struct nfs4_lockowner, lo_perstateid);
663 release_lockowner(lo);
667 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
669 unhash_generic_stateid(stp);
670 release_stateid_lockowners(stp);
671 close_generic_stateid(stp);
674 static void release_open_stateid(struct nfs4_ol_stateid *stp)
676 unhash_open_stateid(stp);
677 unhash_stid(&stp->st_stid);
678 free_generic_stateid(stp);
681 static void unhash_openowner(struct nfs4_openowner *oo)
683 struct nfs4_ol_stateid *stp;
685 list_del(&oo->oo_owner.so_strhash);
686 list_del(&oo->oo_perclient);
687 while (!list_empty(&oo->oo_owner.so_stateids)) {
688 stp = list_first_entry(&oo->oo_owner.so_stateids,
689 struct nfs4_ol_stateid, st_perstateowner);
690 release_open_stateid(stp);
694 static void release_last_closed_stateid(struct nfs4_openowner *oo)
696 struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
699 unhash_stid(&s->st_stid);
700 free_generic_stateid(s);
701 oo->oo_last_closed_stid = NULL;
705 static void release_openowner(struct nfs4_openowner *oo)
707 unhash_openowner(oo);
708 list_del(&oo->oo_close_lru);
709 release_last_closed_stateid(oo);
710 nfs4_free_openowner(oo);
714 hash_sessionid(struct nfs4_sessionid *sessionid)
716 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
718 return sid->sequence % SESSION_HASH_SIZE;
723 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
725 u32 *ptr = (u32 *)(&sessionid->data[0]);
726 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
730 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
736 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
737 * won't be used for replay.
739 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
741 struct nfs4_stateowner *so = cstate->replay_owner;
743 if (nfserr == nfserr_replay_me)
746 if (!seqid_mutating_err(ntohl(nfserr))) {
747 cstate->replay_owner = NULL;
752 if (so->so_is_open_owner)
753 release_last_closed_stateid(openowner(so));
759 gen_sessionid(struct nfsd4_session *ses)
761 struct nfs4_client *clp = ses->se_client;
762 struct nfsd4_sessionid *sid;
764 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
765 sid->clientid = clp->cl_clientid;
766 sid->sequence = current_sessionid++;
771 * The protocol defines ca_maxresponssize_cached to include the size of
772 * the rpc header, but all we need to cache is the data starting after
773 * the end of the initial SEQUENCE operation--the rest we regenerate
774 * each time. Therefore we can advertise a ca_maxresponssize_cached
775 * value that is the number of bytes in our cache plus a few additional
776 * bytes. In order to stay on the safe side, and not promise more than
777 * we can cache, those additional bytes must be the minimum possible: 24
778 * bytes of rpc header (xid through accept state, with AUTH_NULL
779 * verifier), 12 for the compound header (with zero-length tag), and 44
780 * for the SEQUENCE op response:
782 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
785 free_session_slots(struct nfsd4_session *ses)
789 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
790 kfree(ses->se_slots[i]);
794 * We don't actually need to cache the rpc and session headers, so we
795 * can allocate a little less for each slot:
797 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
801 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
804 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
805 return size + sizeof(struct nfsd4_slot);
809 * XXX: If we run out of reserved DRC memory we could (up to a point)
810 * re-negotiate active sessions and reduce their slot usage to make
811 * room for new connections. For now we just fail the create session.
813 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
815 u32 slotsize = slot_bytes(ca);
816 u32 num = ca->maxreqs;
819 spin_lock(&nfsd_drc_lock);
820 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
821 nfsd_drc_max_mem - nfsd_drc_mem_used);
822 num = min_t(int, num, avail / slotsize);
823 nfsd_drc_mem_used += num * slotsize;
824 spin_unlock(&nfsd_drc_lock);
829 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
831 int slotsize = slot_bytes(ca);
833 spin_lock(&nfsd_drc_lock);
834 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
835 spin_unlock(&nfsd_drc_lock);
838 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *attrs)
840 int numslots = attrs->maxreqs;
841 int slotsize = slot_bytes(attrs);
842 struct nfsd4_session *new;
845 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
846 + sizeof(struct nfsd4_session) > PAGE_SIZE);
847 mem = numslots * sizeof(struct nfsd4_slot *);
849 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
852 /* allocate each struct nfsd4_slot and data cache in one piece */
853 for (i = 0; i < numslots; i++) {
854 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
855 if (!new->se_slots[i])
861 kfree(new->se_slots[i]);
866 static void free_conn(struct nfsd4_conn *c)
868 svc_xprt_put(c->cn_xprt);
872 static void nfsd4_conn_lost(struct svc_xpt_user *u)
874 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
875 struct nfs4_client *clp = c->cn_session->se_client;
877 spin_lock(&clp->cl_lock);
878 if (!list_empty(&c->cn_persession)) {
879 list_del(&c->cn_persession);
882 nfsd4_probe_callback(clp);
883 spin_unlock(&clp->cl_lock);
886 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
888 struct nfsd4_conn *conn;
890 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
893 svc_xprt_get(rqstp->rq_xprt);
894 conn->cn_xprt = rqstp->rq_xprt;
895 conn->cn_flags = flags;
896 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
900 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
902 conn->cn_session = ses;
903 list_add(&conn->cn_persession, &ses->se_conns);
906 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
908 struct nfs4_client *clp = ses->se_client;
910 spin_lock(&clp->cl_lock);
911 __nfsd4_hash_conn(conn, ses);
912 spin_unlock(&clp->cl_lock);
915 static int nfsd4_register_conn(struct nfsd4_conn *conn)
917 conn->cn_xpt_user.callback = nfsd4_conn_lost;
918 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
921 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
925 nfsd4_hash_conn(conn, ses);
926 ret = nfsd4_register_conn(conn);
928 /* oops; xprt is already down: */
929 nfsd4_conn_lost(&conn->cn_xpt_user);
930 if (conn->cn_flags & NFS4_CDFC4_BACK) {
931 /* callback channel may be back up */
932 nfsd4_probe_callback(ses->se_client);
936 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
938 u32 dir = NFS4_CDFC4_FORE;
940 if (cses->flags & SESSION4_BACK_CHAN)
941 dir |= NFS4_CDFC4_BACK;
942 return alloc_conn(rqstp, dir);
945 /* must be called under client_lock */
946 static void nfsd4_del_conns(struct nfsd4_session *s)
948 struct nfs4_client *clp = s->se_client;
949 struct nfsd4_conn *c;
951 spin_lock(&clp->cl_lock);
952 while (!list_empty(&s->se_conns)) {
953 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
954 list_del_init(&c->cn_persession);
955 spin_unlock(&clp->cl_lock);
957 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
960 spin_lock(&clp->cl_lock);
962 spin_unlock(&clp->cl_lock);
965 static void __free_session(struct nfsd4_session *ses)
967 free_session_slots(ses);
971 static void free_session(struct nfsd4_session *ses)
973 struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
975 lockdep_assert_held(&nn->client_lock);
976 nfsd4_del_conns(ses);
977 nfsd4_put_drc_mem(&ses->se_fchannel);
981 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
984 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
986 new->se_client = clp;
989 INIT_LIST_HEAD(&new->se_conns);
991 new->se_cb_seq_nr = 1;
992 new->se_flags = cses->flags;
993 new->se_cb_prog = cses->callback_prog;
994 new->se_cb_sec = cses->cb_sec;
995 atomic_set(&new->se_ref, 0);
996 idx = hash_sessionid(&new->se_sessionid);
997 spin_lock(&nn->client_lock);
998 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
999 spin_lock(&clp->cl_lock);
1000 list_add(&new->se_perclnt, &clp->cl_sessions);
1001 spin_unlock(&clp->cl_lock);
1002 spin_unlock(&nn->client_lock);
1003 memcpy(&new->se_fchannel, &cses->fore_channel,
1004 sizeof(struct nfsd4_channel_attrs));
1005 if (cses->flags & SESSION4_BACK_CHAN) {
1006 struct sockaddr *sa = svc_addr(rqstp);
1008 * This is a little silly; with sessions there's no real
1009 * use for the callback address. Use the peer address
1010 * as a reasonable default for now, but consider fixing
1011 * the rpc client not to require an address in the
1014 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1015 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1019 /* caller must hold client_lock */
1020 static struct nfsd4_session *
1021 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1023 struct nfsd4_session *elem;
1025 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1027 dump_sessionid(__func__, sessionid);
1028 idx = hash_sessionid(sessionid);
1029 /* Search in the appropriate list */
1030 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1031 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1032 NFS4_MAX_SESSIONID_LEN)) {
1037 dprintk("%s: session not found\n", __func__);
1041 /* caller must hold client_lock */
1043 unhash_session(struct nfsd4_session *ses)
1045 list_del(&ses->se_hash);
1046 spin_lock(&ses->se_client->cl_lock);
1047 list_del(&ses->se_perclnt);
1048 spin_unlock(&ses->se_client->cl_lock);
1051 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1053 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1055 if (clid->cl_boot == nn->boot_time)
1057 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1058 clid->cl_boot, clid->cl_id, nn->boot_time);
1063 * XXX Should we use a slab cache ?
1064 * This type of memory management is somewhat inefficient, but we use it
1065 * anyway since SETCLIENTID is not a common operation.
1067 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1069 struct nfs4_client *clp;
1071 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1074 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1075 if (clp->cl_name.data == NULL) {
1079 clp->cl_name.len = name.len;
1080 INIT_LIST_HEAD(&clp->cl_sessions);
1081 idr_init(&clp->cl_stateids);
1082 atomic_set(&clp->cl_refcount, 0);
1083 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1084 INIT_LIST_HEAD(&clp->cl_idhash);
1085 INIT_LIST_HEAD(&clp->cl_openowners);
1086 INIT_LIST_HEAD(&clp->cl_delegations);
1087 INIT_LIST_HEAD(&clp->cl_lru);
1088 INIT_LIST_HEAD(&clp->cl_callbacks);
1089 INIT_LIST_HEAD(&clp->cl_revoked);
1090 spin_lock_init(&clp->cl_lock);
1091 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1096 free_client(struct nfs4_client *clp)
1098 struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1100 lockdep_assert_held(&nn->client_lock);
1101 while (!list_empty(&clp->cl_sessions)) {
1102 struct nfsd4_session *ses;
1103 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1105 list_del(&ses->se_perclnt);
1106 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1109 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1110 free_svc_cred(&clp->cl_cred);
1111 kfree(clp->cl_name.data);
1112 idr_destroy(&clp->cl_stateids);
1116 /* must be called under the client_lock */
1118 unhash_client_locked(struct nfs4_client *clp)
1120 struct nfsd4_session *ses;
1122 list_del(&clp->cl_lru);
1123 spin_lock(&clp->cl_lock);
1124 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1125 list_del_init(&ses->se_hash);
1126 spin_unlock(&clp->cl_lock);
1130 destroy_client(struct nfs4_client *clp)
1132 struct nfs4_openowner *oo;
1133 struct nfs4_delegation *dp;
1134 struct list_head reaplist;
1135 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1137 INIT_LIST_HEAD(&reaplist);
1138 spin_lock(&recall_lock);
1139 while (!list_empty(&clp->cl_delegations)) {
1140 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1141 list_del_init(&dp->dl_perclnt);
1142 list_move(&dp->dl_recall_lru, &reaplist);
1144 spin_unlock(&recall_lock);
1145 while (!list_empty(&reaplist)) {
1146 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1147 destroy_delegation(dp);
1149 while (!list_empty(&clp->cl_openowners)) {
1150 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1151 release_openowner(oo);
1153 nfsd4_shutdown_callback(clp);
1154 if (clp->cl_cb_conn.cb_xprt)
1155 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1156 list_del(&clp->cl_idhash);
1157 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1158 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1160 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1161 spin_lock(&nn->client_lock);
1162 unhash_client_locked(clp);
1163 WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1165 spin_unlock(&nn->client_lock);
1168 static void expire_client(struct nfs4_client *clp)
1170 nfsd4_client_record_remove(clp);
1171 destroy_client(clp);
1174 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1176 memcpy(target->cl_verifier.data, source->data,
1177 sizeof(target->cl_verifier.data));
1180 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1182 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1183 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1186 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1188 if (source->cr_principal) {
1189 target->cr_principal =
1190 kstrdup(source->cr_principal, GFP_KERNEL);
1191 if (target->cr_principal == NULL)
1194 target->cr_principal = NULL;
1195 target->cr_flavor = source->cr_flavor;
1196 target->cr_uid = source->cr_uid;
1197 target->cr_gid = source->cr_gid;
1198 target->cr_group_info = source->cr_group_info;
1199 get_group_info(target->cr_group_info);
1204 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1208 res = o1->len - o2->len;
1211 return (long long)memcmp(o1->data, o2->data, o1->len);
1214 static int same_name(const char *n1, const char *n2)
1216 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1220 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1222 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1226 same_clid(clientid_t *cl1, clientid_t *cl2)
1228 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1231 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1235 if (g1->ngroups != g2->ngroups)
1237 for (i=0; i<g1->ngroups; i++)
1238 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1244 * RFC 3530 language requires clid_inuse be returned when the
1245 * "principal" associated with a requests differs from that previously
1246 * used. We use uid, gid's, and gss principal string as our best
1247 * approximation. We also don't want to allow non-gss use of a client
1248 * established using gss: in theory cr_principal should catch that
1249 * change, but in practice cr_principal can be null even in the gss case
1250 * since gssd doesn't always pass down a principal string.
1252 static bool is_gss_cred(struct svc_cred *cr)
1254 /* Is cr_flavor one of the gss "pseudoflavors"?: */
1255 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1260 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1262 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1263 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1264 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1265 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1267 if (cr1->cr_principal == cr2->cr_principal)
1269 if (!cr1->cr_principal || !cr2->cr_principal)
1271 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1274 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1276 static u32 current_clientid = 1;
1278 clp->cl_clientid.cl_boot = nn->boot_time;
1279 clp->cl_clientid.cl_id = current_clientid++;
1282 static void gen_confirm(struct nfs4_client *clp)
1287 verf[0] = (__be32)get_seconds();
1288 verf[1] = (__be32)i++;
1289 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1292 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1294 struct nfs4_stid *ret;
1296 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1297 if (!ret || !ret->sc_type)
1302 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1304 struct nfs4_stid *s;
1306 s = find_stateid(cl, t);
1309 if (typemask & s->sc_type)
1314 static struct nfs4_client *create_client(struct xdr_netobj name,
1315 struct svc_rqst *rqstp, nfs4_verifier *verf)
1317 struct nfs4_client *clp;
1318 struct sockaddr *sa = svc_addr(rqstp);
1320 struct net *net = SVC_NET(rqstp);
1321 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1323 clp = alloc_client(name);
1327 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1329 spin_lock(&nn->client_lock);
1331 spin_unlock(&nn->client_lock);
1334 nfsd4_init_callback(&clp->cl_cb_null);
1335 clp->cl_time = get_seconds();
1336 clear_bit(0, &clp->cl_cb_slot_busy);
1337 copy_verf(clp, verf);
1338 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1340 clp->cl_cb_session = NULL;
1346 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1348 struct rb_node **new = &(root->rb_node), *parent = NULL;
1349 struct nfs4_client *clp;
1352 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1355 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1356 new = &((*new)->rb_left);
1358 new = &((*new)->rb_right);
1361 rb_link_node(&new_clp->cl_namenode, parent, new);
1362 rb_insert_color(&new_clp->cl_namenode, root);
1365 static struct nfs4_client *
1366 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1369 struct rb_node *node = root->rb_node;
1370 struct nfs4_client *clp;
1373 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1374 cmp = compare_blob(&clp->cl_name, name);
1376 node = node->rb_left;
1378 node = node->rb_right;
1386 add_to_unconfirmed(struct nfs4_client *clp)
1388 unsigned int idhashval;
1389 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1391 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1392 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1393 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1394 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1399 move_to_confirmed(struct nfs4_client *clp)
1401 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1402 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1404 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1405 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1406 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1407 add_clp_to_name_tree(clp, &nn->conf_name_tree);
1408 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1412 static struct nfs4_client *
1413 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1415 struct nfs4_client *clp;
1416 unsigned int idhashval = clientid_hashval(clid->cl_id);
1418 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1419 if (same_clid(&clp->cl_clientid, clid)) {
1420 if ((bool)clp->cl_minorversion != sessions)
1429 static struct nfs4_client *
1430 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1432 struct list_head *tbl = nn->conf_id_hashtbl;
1434 return find_client_in_id_table(tbl, clid, sessions);
1437 static struct nfs4_client *
1438 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1440 struct list_head *tbl = nn->unconf_id_hashtbl;
1442 return find_client_in_id_table(tbl, clid, sessions);
1445 static bool clp_used_exchangeid(struct nfs4_client *clp)
1447 return clp->cl_exchange_flags != 0;
1450 static struct nfs4_client *
1451 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1453 return find_clp_in_name_tree(name, &nn->conf_name_tree);
1456 static struct nfs4_client *
1457 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1459 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1463 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1465 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1466 struct sockaddr *sa = svc_addr(rqstp);
1467 u32 scopeid = rpc_get_scope_id(sa);
1468 unsigned short expected_family;
1470 /* Currently, we only support tcp and tcp6 for the callback channel */
1471 if (se->se_callback_netid_len == 3 &&
1472 !memcmp(se->se_callback_netid_val, "tcp", 3))
1473 expected_family = AF_INET;
1474 else if (se->se_callback_netid_len == 4 &&
1475 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1476 expected_family = AF_INET6;
1480 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1481 se->se_callback_addr_len,
1482 (struct sockaddr *)&conn->cb_addr,
1483 sizeof(conn->cb_addr));
1485 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1488 if (conn->cb_addr.ss_family == AF_INET6)
1489 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1491 conn->cb_prog = se->se_callback_prog;
1492 conn->cb_ident = se->se_callback_ident;
1493 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1496 conn->cb_addr.ss_family = AF_UNSPEC;
1497 conn->cb_addrlen = 0;
1498 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1499 "will not receive delegations\n",
1500 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1506 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1509 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1511 struct nfsd4_slot *slot = resp->cstate.slot;
1514 dprintk("--> %s slot %p\n", __func__, slot);
1516 slot->sl_opcnt = resp->opcnt;
1517 slot->sl_status = resp->cstate.status;
1519 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1520 if (nfsd4_not_cached(resp)) {
1521 slot->sl_datalen = 0;
1524 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1525 base = (char *)resp->cstate.datap -
1526 (char *)resp->xbuf->head[0].iov_base;
1527 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1529 WARN("%s: sessions DRC could not cache compound\n", __func__);
1534 * Encode the replay sequence operation from the slot values.
1535 * If cachethis is FALSE encode the uncached rep error on the next
1536 * operation which sets resp->p and increments resp->opcnt for
1537 * nfs4svc_encode_compoundres.
1541 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1542 struct nfsd4_compoundres *resp)
1544 struct nfsd4_op *op;
1545 struct nfsd4_slot *slot = resp->cstate.slot;
1547 /* Encode the replayed sequence operation */
1548 op = &args->ops[resp->opcnt - 1];
1549 nfsd4_encode_operation(resp, op);
1551 /* Return nfserr_retry_uncached_rep in next operation. */
1552 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1553 op = &args->ops[resp->opcnt++];
1554 op->status = nfserr_retry_uncached_rep;
1555 nfsd4_encode_operation(resp, op);
1561 * The sequence operation is not cached because we can use the slot and
1565 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1566 struct nfsd4_sequence *seq)
1568 struct nfsd4_slot *slot = resp->cstate.slot;
1571 dprintk("--> %s slot %p\n", __func__, slot);
1573 /* Either returns 0 or nfserr_retry_uncached */
1574 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1575 if (status == nfserr_retry_uncached_rep)
1578 /* The sequence operation has been encoded, cstate->datap set. */
1579 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1581 resp->opcnt = slot->sl_opcnt;
1582 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1583 status = slot->sl_status;
1589 * Set the exchange_id flags returned by the server.
1592 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1594 /* pNFS is not supported */
1595 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1597 /* Referrals are supported, Migration is not. */
1598 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1600 /* set the wire flags to return to client. */
1601 clid->flags = new->cl_exchange_flags;
1604 static bool client_has_state(struct nfs4_client *clp)
1607 * Note clp->cl_openowners check isn't quite right: there's no
1608 * need to count owners without stateid's.
1610 * Also note we should probably be using this in 4.0 case too.
1612 return !list_empty(&clp->cl_openowners)
1613 || !list_empty(&clp->cl_delegations)
1614 || !list_empty(&clp->cl_sessions);
1618 nfsd4_exchange_id(struct svc_rqst *rqstp,
1619 struct nfsd4_compound_state *cstate,
1620 struct nfsd4_exchange_id *exid)
1622 struct nfs4_client *unconf, *conf, *new;
1624 char addr_str[INET6_ADDRSTRLEN];
1625 nfs4_verifier verf = exid->verifier;
1626 struct sockaddr *sa = svc_addr(rqstp);
1627 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1628 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1630 rpc_ntop(sa, addr_str, sizeof(addr_str));
1631 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1632 "ip_addr=%s flags %x, spa_how %d\n",
1633 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1634 addr_str, exid->flags, exid->spa_how);
1636 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1637 return nfserr_inval;
1639 /* Currently only support SP4_NONE */
1640 switch (exid->spa_how) {
1643 default: /* checked by xdr code */
1646 return nfserr_encr_alg_unsupp;
1648 return nfserr_serverfault; /* no excuse :-/ */
1651 /* Cases below refer to rfc 5661 section 18.35.4: */
1653 conf = find_confirmed_client_by_name(&exid->clname, nn);
1655 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1656 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1659 if (!clp_used_exchangeid(conf)) { /* buggy client */
1660 status = nfserr_inval;
1663 if (!creds_match) { /* case 9 */
1664 status = nfserr_perm;
1667 if (!verfs_match) { /* case 8 */
1668 status = nfserr_not_same;
1672 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1676 if (!creds_match) { /* case 3 */
1677 if (client_has_state(conf)) {
1678 status = nfserr_clid_inuse;
1681 expire_client(conf);
1684 if (verfs_match) { /* case 2 */
1685 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1689 /* case 5, client reboot */
1693 if (update) { /* case 7 */
1694 status = nfserr_noent;
1698 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
1699 if (unconf) /* case 4, possible retry or client restart */
1700 expire_client(unconf);
1702 /* case 1 (normal case) */
1704 new = create_client(exid->clname, rqstp, &verf);
1706 status = nfserr_jukebox;
1709 new->cl_minorversion = 1;
1712 add_to_unconfirmed(new);
1714 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1715 exid->clientid.cl_id = new->cl_clientid.cl_id;
1717 exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1718 nfsd4_set_ex_flags(new, exid);
1720 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1721 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1725 nfs4_unlock_state();
1730 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1732 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1735 /* The slot is in use, and no response has been sent. */
1737 if (seqid == slot_seqid)
1738 return nfserr_jukebox;
1740 return nfserr_seq_misordered;
1742 /* Note unsigned 32-bit arithmetic handles wraparound: */
1743 if (likely(seqid == slot_seqid + 1))
1745 if (seqid == slot_seqid)
1746 return nfserr_replay_cache;
1747 return nfserr_seq_misordered;
1751 * Cache the create session result into the create session single DRC
1752 * slot cache by saving the xdr structure. sl_seqid has been set.
1753 * Do this for solo or embedded create session operations.
1756 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1757 struct nfsd4_clid_slot *slot, __be32 nfserr)
1759 slot->sl_status = nfserr;
1760 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1764 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1765 struct nfsd4_clid_slot *slot)
1767 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1768 return slot->sl_status;
1771 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1772 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1773 1 + /* MIN tag is length with zero, only length */ \
1774 3 + /* version, opcount, opcode */ \
1775 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1776 /* seqid, slotID, slotID, cache */ \
1777 4 ) * sizeof(__be32))
1779 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1780 2 + /* verifier: AUTH_NULL, length 0 */\
1782 1 + /* MIN tag is length with zero, only length */ \
1783 3 + /* opcount, opcode, opstatus*/ \
1784 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1785 /* seqid, slotID, slotID, slotID, status */ \
1786 5 ) * sizeof(__be32))
1788 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1790 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1792 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1793 return nfserr_toosmall;
1794 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1795 return nfserr_toosmall;
1796 ca->headerpadsz = 0;
1797 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1798 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1799 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1800 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1801 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1802 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1804 * Note decreasing slot size below client's request may make it
1805 * difficult for client to function correctly, whereas
1806 * decreasing the number of slots will (just?) affect
1807 * performance. When short on memory we therefore prefer to
1808 * decrease number of slots instead of their size. Clients that
1809 * request larger slots than they need will get poor results:
1811 ca->maxreqs = nfsd4_get_drc_mem(ca);
1813 return nfserr_jukebox;
1818 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1820 ca->headerpadsz = 0;
1823 * These RPC_MAX_HEADER macros are overkill, especially since we
1824 * don't even do gss on the backchannel yet. But this is still
1825 * less than 1k. Tighten up this estimate in the unlikely event
1826 * it turns out to be a problem for some client:
1828 if (ca->maxreq_sz < NFS4_enc_cb_recall_sz + RPC_MAX_HEADER_WITH_AUTH)
1829 return nfserr_toosmall;
1830 if (ca->maxresp_sz < NFS4_dec_cb_recall_sz + RPC_MAX_REPHEADER_WITH_AUTH)
1831 return nfserr_toosmall;
1832 ca->maxresp_cached = 0;
1834 return nfserr_toosmall;
1840 nfsd4_create_session(struct svc_rqst *rqstp,
1841 struct nfsd4_compound_state *cstate,
1842 struct nfsd4_create_session *cr_ses)
1844 struct sockaddr *sa = svc_addr(rqstp);
1845 struct nfs4_client *conf, *unconf;
1846 struct nfsd4_session *new;
1847 struct nfsd4_conn *conn;
1848 struct nfsd4_clid_slot *cs_slot = NULL;
1850 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1852 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1853 return nfserr_inval;
1854 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1857 status = check_backchannel_attrs(&cr_ses->back_channel);
1860 status = nfserr_jukebox;
1861 new = alloc_session(&cr_ses->fore_channel);
1863 goto out_release_drc_mem;
1864 conn = alloc_conn_from_crses(rqstp, cr_ses);
1866 goto out_free_session;
1869 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1870 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1871 WARN_ON_ONCE(conf && unconf);
1874 cs_slot = &conf->cl_cs_slot;
1875 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1876 if (status == nfserr_replay_cache) {
1877 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1879 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1880 status = nfserr_seq_misordered;
1883 } else if (unconf) {
1884 struct nfs4_client *old;
1885 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1886 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1887 status = nfserr_clid_inuse;
1890 cs_slot = &unconf->cl_cs_slot;
1891 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1893 /* an unconfirmed replay returns misordered */
1894 status = nfserr_seq_misordered;
1897 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1899 status = mark_client_expired(old);
1904 move_to_confirmed(unconf);
1907 status = nfserr_stale_clientid;
1912 * We do not support RDMA or persistent sessions
1914 cr_ses->flags &= ~SESSION4_PERSIST;
1915 cr_ses->flags &= ~SESSION4_RDMA;
1917 init_session(rqstp, new, conf, cr_ses);
1918 nfsd4_init_conn(rqstp, conn, new);
1920 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1921 NFS4_MAX_SESSIONID_LEN);
1922 cs_slot->sl_seqid++;
1923 cr_ses->seqid = cs_slot->sl_seqid;
1925 /* cache solo and embedded create sessions under the state lock */
1926 nfsd4_cache_create_session(cr_ses, cs_slot, status);
1927 nfs4_unlock_state();
1930 nfs4_unlock_state();
1933 __free_session(new);
1934 out_release_drc_mem:
1935 nfsd4_put_drc_mem(&cr_ses->fore_channel);
1939 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1942 case NFS4_CDFC4_FORE:
1943 case NFS4_CDFC4_BACK:
1945 case NFS4_CDFC4_FORE_OR_BOTH:
1946 case NFS4_CDFC4_BACK_OR_BOTH:
1947 *dir = NFS4_CDFC4_BOTH;
1950 return nfserr_inval;
1953 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
1955 struct nfsd4_session *session = cstate->session;
1956 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1958 spin_lock(&nn->client_lock);
1959 session->se_cb_prog = bc->bc_cb_program;
1960 session->se_cb_sec = bc->bc_cb_sec;
1961 spin_unlock(&nn->client_lock);
1963 nfsd4_probe_callback(session->se_client);
1968 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1969 struct nfsd4_compound_state *cstate,
1970 struct nfsd4_bind_conn_to_session *bcts)
1973 struct nfsd4_conn *conn;
1974 struct nfsd4_session *session;
1975 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1977 if (!nfsd4_last_compound_op(rqstp))
1978 return nfserr_not_only_op;
1980 spin_lock(&nn->client_lock);
1981 session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
1982 spin_unlock(&nn->client_lock);
1983 status = nfserr_badsession;
1986 status = nfsd4_map_bcts_dir(&bcts->dir);
1989 conn = alloc_conn(rqstp, bcts->dir);
1990 status = nfserr_jukebox;
1993 nfsd4_init_conn(rqstp, conn, session);
1996 nfs4_unlock_state();
2000 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2004 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2008 nfsd4_destroy_session(struct svc_rqst *r,
2009 struct nfsd4_compound_state *cstate,
2010 struct nfsd4_destroy_session *sessionid)
2012 struct nfsd4_session *ses;
2014 struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2017 status = nfserr_not_only_op;
2018 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2019 if (!nfsd4_last_compound_op(r))
2022 dump_sessionid(__func__, &sessionid->sessionid);
2023 spin_lock(&nn->client_lock);
2024 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2025 status = nfserr_badsession;
2027 goto out_client_lock;
2028 status = mark_session_dead_locked(ses);
2030 goto out_client_lock;
2031 unhash_session(ses);
2032 spin_unlock(&nn->client_lock);
2034 nfsd4_probe_callback_sync(ses->se_client);
2036 spin_lock(&nn->client_lock);
2040 spin_unlock(&nn->client_lock);
2042 nfs4_unlock_state();
2046 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2048 struct nfsd4_conn *c;
2050 list_for_each_entry(c, &s->se_conns, cn_persession) {
2051 if (c->cn_xprt == xpt) {
2058 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2060 struct nfs4_client *clp = ses->se_client;
2061 struct nfsd4_conn *c;
2064 spin_lock(&clp->cl_lock);
2065 c = __nfsd4_find_conn(new->cn_xprt, ses);
2067 spin_unlock(&clp->cl_lock);
2071 __nfsd4_hash_conn(new, ses);
2072 spin_unlock(&clp->cl_lock);
2073 ret = nfsd4_register_conn(new);
2075 /* oops; xprt is already down: */
2076 nfsd4_conn_lost(&new->cn_xpt_user);
2080 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2082 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2084 return args->opcnt > session->se_fchannel.maxops;
2087 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2088 struct nfsd4_session *session)
2090 struct xdr_buf *xb = &rqstp->rq_arg;
2092 return xb->len > session->se_fchannel.maxreq_sz;
2096 nfsd4_sequence(struct svc_rqst *rqstp,
2097 struct nfsd4_compound_state *cstate,
2098 struct nfsd4_sequence *seq)
2100 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2101 struct nfsd4_session *session;
2102 struct nfs4_client *clp;
2103 struct nfsd4_slot *slot;
2104 struct nfsd4_conn *conn;
2106 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2108 if (resp->opcnt != 1)
2109 return nfserr_sequence_pos;
2112 * Will be either used or freed by nfsd4_sequence_check_conn
2115 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2117 return nfserr_jukebox;
2119 spin_lock(&nn->client_lock);
2120 status = nfserr_badsession;
2121 session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2123 goto out_no_session;
2124 clp = session->se_client;
2125 status = get_client_locked(clp);
2127 goto out_no_session;
2128 status = nfsd4_get_session_locked(session);
2130 goto out_put_client;
2132 status = nfserr_too_many_ops;
2133 if (nfsd4_session_too_many_ops(rqstp, session))
2134 goto out_put_session;
2136 status = nfserr_req_too_big;
2137 if (nfsd4_request_too_big(rqstp, session))
2138 goto out_put_session;
2140 status = nfserr_badslot;
2141 if (seq->slotid >= session->se_fchannel.maxreqs)
2142 goto out_put_session;
2144 slot = session->se_slots[seq->slotid];
2145 dprintk("%s: slotid %d\n", __func__, seq->slotid);
2147 /* We do not negotiate the number of slots yet, so set the
2148 * maxslots to the session maxreqs which is used to encode
2149 * sr_highest_slotid and the sr_target_slot id to maxslots */
2150 seq->maxslots = session->se_fchannel.maxreqs;
2152 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2153 slot->sl_flags & NFSD4_SLOT_INUSE);
2154 if (status == nfserr_replay_cache) {
2155 status = nfserr_seq_misordered;
2156 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2157 goto out_put_session;
2158 cstate->slot = slot;
2159 cstate->session = session;
2160 /* Return the cached reply status and set cstate->status
2161 * for nfsd4_proc_compound processing */
2162 status = nfsd4_replay_cache_entry(resp, seq);
2163 cstate->status = nfserr_replay_cache;
2167 goto out_put_session;
2169 nfsd4_sequence_check_conn(conn, session);
2172 /* Success! bump slot seqid */
2173 slot->sl_seqid = seq->seqid;
2174 slot->sl_flags |= NFSD4_SLOT_INUSE;
2176 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2178 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2180 cstate->slot = slot;
2181 cstate->session = session;
2184 switch (clp->cl_cb_state) {
2186 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2188 case NFSD4_CB_FAULT:
2189 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2192 seq->status_flags = 0;
2194 if (!list_empty(&clp->cl_revoked))
2195 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2198 spin_unlock(&nn->client_lock);
2201 nfsd4_put_session(session);
2203 put_client_renew_locked(clp);
2204 goto out_no_session;
2208 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2210 struct nfs4_client *conf, *unconf, *clp;
2212 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2215 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2216 conf = find_confirmed_client(&dc->clientid, true, nn);
2217 WARN_ON_ONCE(conf && unconf);
2222 if (client_has_state(conf)) {
2223 status = nfserr_clientid_busy;
2229 status = nfserr_stale_clientid;
2235 nfs4_unlock_state();
2240 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2244 if (rc->rca_one_fs) {
2245 if (!cstate->current_fh.fh_dentry)
2246 return nfserr_nofilehandle;
2248 * We don't take advantage of the rca_one_fs case.
2249 * That's OK, it's optional, we can safely ignore it.
2255 status = nfserr_complete_already;
2256 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2257 &cstate->session->se_client->cl_flags))
2260 status = nfserr_stale_clientid;
2261 if (is_client_expired(cstate->session->se_client))
2263 * The following error isn't really legal.
2264 * But we only get here if the client just explicitly
2265 * destroyed the client. Surely it no longer cares what
2266 * error it gets back on an operation for the dead
2272 nfsd4_client_record_create(cstate->session->se_client);
2274 nfs4_unlock_state();
2279 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2280 struct nfsd4_setclientid *setclid)
2282 struct xdr_netobj clname = setclid->se_name;
2283 nfs4_verifier clverifier = setclid->se_verf;
2284 struct nfs4_client *conf, *unconf, *new;
2286 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2288 /* Cases below refer to rfc 3530 section 14.2.33: */
2290 conf = find_confirmed_client_by_name(&clname, nn);
2293 status = nfserr_clid_inuse;
2294 if (clp_used_exchangeid(conf))
2296 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2297 char addr_str[INET6_ADDRSTRLEN];
2298 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2300 dprintk("NFSD: setclientid: string in use by client "
2301 "at %s\n", addr_str);
2305 unconf = find_unconfirmed_client_by_name(&clname, nn);
2307 expire_client(unconf);
2308 status = nfserr_jukebox;
2309 new = create_client(clname, rqstp, &clverifier);
2312 if (conf && same_verf(&conf->cl_verifier, &clverifier))
2313 /* case 1: probable callback update */
2314 copy_clid(new, conf);
2315 else /* case 4 (new client) or cases 2, 3 (client reboot): */
2317 new->cl_minorversion = 0;
2318 gen_callback(new, setclid, rqstp);
2319 add_to_unconfirmed(new);
2320 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2321 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2322 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2325 nfs4_unlock_state();
2331 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2332 struct nfsd4_compound_state *cstate,
2333 struct nfsd4_setclientid_confirm *setclientid_confirm)
2335 struct nfs4_client *conf, *unconf;
2336 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2337 clientid_t * clid = &setclientid_confirm->sc_clientid;
2339 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2341 if (STALE_CLIENTID(clid, nn))
2342 return nfserr_stale_clientid;
2345 conf = find_confirmed_client(clid, false, nn);
2346 unconf = find_unconfirmed_client(clid, false, nn);
2348 * We try hard to give out unique clientid's, so if we get an
2349 * attempt to confirm the same clientid with a different cred,
2350 * there's a bug somewhere. Let's charitably assume it's our
2353 status = nfserr_serverfault;
2354 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2356 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2358 /* cases below refer to rfc 3530 section 14.2.34: */
2359 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2360 if (conf && !unconf) /* case 2: probable retransmit */
2362 else /* case 4: client hasn't noticed we rebooted yet? */
2363 status = nfserr_stale_clientid;
2367 if (conf) { /* case 1: callback update */
2368 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2369 nfsd4_probe_callback(conf);
2370 expire_client(unconf);
2371 } else { /* case 3: normal case; new or rebooted client */
2372 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2374 status = mark_client_expired(conf);
2377 expire_client(conf);
2379 move_to_confirmed(unconf);
2380 nfsd4_probe_callback(unconf);
2383 nfs4_unlock_state();
2387 static struct nfs4_file *nfsd4_alloc_file(void)
2389 return kmem_cache_alloc(file_slab, GFP_KERNEL);
2392 /* OPEN Share state helper functions */
2393 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2395 unsigned int hashval = file_hashval(ino);
2397 atomic_set(&fp->fi_ref, 1);
2398 INIT_LIST_HEAD(&fp->fi_stateids);
2399 INIT_LIST_HEAD(&fp->fi_delegations);
2400 fp->fi_inode = igrab(ino);
2401 fp->fi_had_conflict = false;
2402 fp->fi_lease = NULL;
2403 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2404 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2405 spin_lock(&recall_lock);
2406 hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2407 spin_unlock(&recall_lock);
2411 nfsd4_free_slab(struct kmem_cache **slab)
2415 kmem_cache_destroy(*slab);
2420 nfsd4_free_slabs(void)
2422 nfsd4_free_slab(&openowner_slab);
2423 nfsd4_free_slab(&lockowner_slab);
2424 nfsd4_free_slab(&file_slab);
2425 nfsd4_free_slab(&stateid_slab);
2426 nfsd4_free_slab(&deleg_slab);
2430 nfsd4_init_slabs(void)
2432 openowner_slab = kmem_cache_create("nfsd4_openowners",
2433 sizeof(struct nfs4_openowner), 0, 0, NULL);
2434 if (openowner_slab == NULL)
2436 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2437 sizeof(struct nfs4_lockowner), 0, 0, NULL);
2438 if (lockowner_slab == NULL)
2440 file_slab = kmem_cache_create("nfsd4_files",
2441 sizeof(struct nfs4_file), 0, 0, NULL);
2442 if (file_slab == NULL)
2444 stateid_slab = kmem_cache_create("nfsd4_stateids",
2445 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2446 if (stateid_slab == NULL)
2448 deleg_slab = kmem_cache_create("nfsd4_delegations",
2449 sizeof(struct nfs4_delegation), 0, 0, NULL);
2450 if (deleg_slab == NULL)
2455 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2459 void nfs4_free_openowner(struct nfs4_openowner *oo)
2461 kfree(oo->oo_owner.so_owner.data);
2462 kmem_cache_free(openowner_slab, oo);
2465 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2467 kfree(lo->lo_owner.so_owner.data);
2468 kmem_cache_free(lockowner_slab, lo);
2471 static void init_nfs4_replay(struct nfs4_replay *rp)
2473 rp->rp_status = nfserr_serverfault;
2475 rp->rp_buf = rp->rp_ibuf;
2478 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2480 struct nfs4_stateowner *sop;
2482 sop = kmem_cache_alloc(slab, GFP_KERNEL);
2486 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2487 if (!sop->so_owner.data) {
2488 kmem_cache_free(slab, sop);
2491 sop->so_owner.len = owner->len;
2493 INIT_LIST_HEAD(&sop->so_stateids);
2494 sop->so_client = clp;
2495 init_nfs4_replay(&sop->so_replay);
2499 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2501 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2503 list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2504 list_add(&oo->oo_perclient, &clp->cl_openowners);
2507 static struct nfs4_openowner *
2508 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2509 struct nfs4_openowner *oo;
2511 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2514 oo->oo_owner.so_is_open_owner = 1;
2515 oo->oo_owner.so_seqid = open->op_seqid;
2516 oo->oo_flags = NFS4_OO_NEW;
2518 oo->oo_last_closed_stid = NULL;
2519 INIT_LIST_HEAD(&oo->oo_close_lru);
2520 hash_openowner(oo, clp, strhashval);
2524 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2525 struct nfs4_openowner *oo = open->op_openowner;
2527 stp->st_stid.sc_type = NFS4_OPEN_STID;
2528 INIT_LIST_HEAD(&stp->st_lockowners);
2529 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2530 list_add(&stp->st_perfile, &fp->fi_stateids);
2531 stp->st_stateowner = &oo->oo_owner;
2534 stp->st_access_bmap = 0;
2535 stp->st_deny_bmap = 0;
2536 set_access(open->op_share_access, stp);
2537 set_deny(open->op_share_deny, stp);
2538 stp->st_openstp = NULL;
2542 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2544 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2546 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2548 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2549 oo->oo_time = get_seconds();
2553 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2556 return (sop->so_owner.len == owner->len) &&
2557 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2558 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2561 static struct nfs4_openowner *
2562 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2563 bool sessions, struct nfsd_net *nn)
2565 struct nfs4_stateowner *so;
2566 struct nfs4_openowner *oo;
2567 struct nfs4_client *clp;
2569 list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2570 if (!so->so_is_open_owner)
2572 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2574 clp = oo->oo_owner.so_client;
2575 if ((bool)clp->cl_minorversion != sessions)
2577 renew_client(oo->oo_owner.so_client);
2584 /* search file_hashtbl[] for file */
2585 static struct nfs4_file *
2586 find_file(struct inode *ino)
2588 unsigned int hashval = file_hashval(ino);
2589 struct nfs4_file *fp;
2591 spin_lock(&recall_lock);
2592 hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2593 if (fp->fi_inode == ino) {
2595 spin_unlock(&recall_lock);
2599 spin_unlock(&recall_lock);
2604 * Called to check deny when READ with all zero stateid or
2605 * WRITE with all zero or all one stateid
2608 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2610 struct inode *ino = current_fh->fh_dentry->d_inode;
2611 struct nfs4_file *fp;
2612 struct nfs4_ol_stateid *stp;
2615 fp = find_file(ino);
2618 ret = nfserr_locked;
2619 /* Search for conflicting share reservations */
2620 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2621 if (test_deny(deny_type, stp) ||
2622 test_deny(NFS4_SHARE_DENY_BOTH, stp))
2631 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2633 struct nfs4_client *clp = dp->dl_stid.sc_client;
2634 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2636 /* We're assuming the state code never drops its reference
2637 * without first removing the lease. Since we're in this lease
2638 * callback (and since the lease code is serialized by the kernel
2639 * lock) we know the server hasn't removed the lease yet, we know
2640 * it's safe to take a reference: */
2641 atomic_inc(&dp->dl_count);
2643 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2645 /* only place dl_time is set. protected by lock_flocks*/
2646 dp->dl_time = get_seconds();
2648 nfsd4_cb_recall(dp);
2651 /* Called from break_lease() with lock_flocks() held. */
2652 static void nfsd_break_deleg_cb(struct file_lock *fl)
2654 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2655 struct nfs4_delegation *dp;
2658 WARN(1, "(%p)->fl_owner NULL\n", fl);
2661 if (fp->fi_had_conflict) {
2662 WARN(1, "duplicate break on %p\n", fp);
2666 * We don't want the locks code to timeout the lease for us;
2667 * we'll remove it ourself if a delegation isn't returned
2670 fl->fl_break_time = 0;
2672 spin_lock(&recall_lock);
2673 fp->fi_had_conflict = true;
2674 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2675 nfsd_break_one_deleg(dp);
2676 spin_unlock(&recall_lock);
2680 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2683 return lease_modify(onlist, arg);
2688 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2689 .lm_break = nfsd_break_deleg_cb,
2690 .lm_change = nfsd_change_deleg_cb,
2693 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2695 if (nfsd4_has_session(cstate))
2697 if (seqid == so->so_seqid - 1)
2698 return nfserr_replay_me;
2699 if (seqid == so->so_seqid)
2701 return nfserr_bad_seqid;
2705 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2706 struct nfsd4_open *open, struct nfsd_net *nn)
2708 clientid_t *clientid = &open->op_clientid;
2709 struct nfs4_client *clp = NULL;
2710 unsigned int strhashval;
2711 struct nfs4_openowner *oo = NULL;
2714 if (STALE_CLIENTID(&open->op_clientid, nn))
2715 return nfserr_stale_clientid;
2717 * In case we need it later, after we've already created the
2718 * file and don't want to risk a further failure:
2720 open->op_file = nfsd4_alloc_file();
2721 if (open->op_file == NULL)
2722 return nfserr_jukebox;
2724 strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2725 oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2726 open->op_openowner = oo;
2728 clp = find_confirmed_client(clientid, cstate->minorversion,
2731 return nfserr_expired;
2734 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2735 /* Replace unconfirmed owners without checking for replay. */
2736 clp = oo->oo_owner.so_client;
2737 release_openowner(oo);
2738 open->op_openowner = NULL;
2741 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2744 clp = oo->oo_owner.so_client;
2747 oo = alloc_init_open_stateowner(strhashval, clp, open);
2749 return nfserr_jukebox;
2750 open->op_openowner = oo;
2752 open->op_stp = nfs4_alloc_stateid(clp);
2754 return nfserr_jukebox;
2758 static inline __be32
2759 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2761 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2762 return nfserr_openmode;
2767 static int share_access_to_flags(u32 share_access)
2769 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2772 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2774 struct nfs4_stid *ret;
2776 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2779 return delegstateid(ret);
2782 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2784 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2785 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2789 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2790 struct nfs4_delegation **dp)
2793 __be32 status = nfserr_bad_stateid;
2795 *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2798 flags = share_access_to_flags(open->op_share_access);
2799 status = nfs4_check_delegmode(*dp, flags);
2803 if (!nfsd4_is_deleg_cur(open))
2807 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2812 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2814 struct nfs4_ol_stateid *local;
2815 struct nfs4_openowner *oo = open->op_openowner;
2817 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2818 /* ignore lock owners */
2819 if (local->st_stateowner->so_is_open_owner == 0)
2821 /* remember if we have seen this open owner */
2822 if (local->st_stateowner == &oo->oo_owner)
2824 /* check for conflicting share reservations */
2825 if (!test_share(local, open))
2826 return nfserr_share_denied;
2831 static inline int nfs4_access_to_access(u32 nfs4_access)
2835 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2836 flags |= NFSD_MAY_READ;
2837 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2838 flags |= NFSD_MAY_WRITE;
2842 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2843 struct svc_fh *cur_fh, struct nfsd4_open *open)
2846 int oflag = nfs4_access_to_omode(open->op_share_access);
2847 int access = nfs4_access_to_access(open->op_share_access);
2849 if (!fp->fi_fds[oflag]) {
2850 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2851 &fp->fi_fds[oflag]);
2855 nfs4_file_get_access(fp, oflag);
2860 static inline __be32
2861 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2862 struct nfsd4_open *open)
2864 struct iattr iattr = {
2865 .ia_valid = ATTR_SIZE,
2868 if (!open->op_truncate)
2870 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2871 return nfserr_inval;
2872 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2876 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)
2878 u32 op_share_access = open->op_share_access;
2882 new_access = !test_access(op_share_access, stp);
2884 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2888 status = nfsd4_truncate(rqstp, cur_fh, open);
2891 int oflag = nfs4_access_to_omode(op_share_access);
2892 nfs4_file_put_access(fp, oflag);
2896 /* remember the open */
2897 set_access(op_share_access, stp);
2898 set_deny(open->op_share_deny, stp);
2905 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2907 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2910 /* Should we give out recallable state?: */
2911 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2913 if (clp->cl_cb_state == NFSD4_CB_UP)
2916 * In the sessions case, since we don't have to establish a
2917 * separate connection for callbacks, we assume it's OK
2918 * until we hear otherwise:
2920 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2923 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2925 struct file_lock *fl;
2927 fl = locks_alloc_lock();
2930 locks_init_lock(fl);
2931 fl->fl_lmops = &nfsd_lease_mng_ops;
2932 fl->fl_flags = FL_LEASE;
2933 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2934 fl->fl_end = OFFSET_MAX;
2935 fl->fl_owner = (fl_owner_t)(dp->dl_file);
2936 fl->fl_pid = current->tgid;
2940 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2942 struct nfs4_file *fp = dp->dl_file;
2943 struct file_lock *fl;
2946 fl = nfs4_alloc_init_lease(dp, flag);
2949 fl->fl_file = find_readable_file(fp);
2950 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2951 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2953 list_del_init(&dp->dl_perclnt);
2954 locks_free_lock(fl);
2958 fp->fi_deleg_file = get_file(fl->fl_file);
2959 atomic_set(&fp->fi_delegees, 1);
2960 list_add(&dp->dl_perfile, &fp->fi_delegations);
2964 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag, struct nfs4_file *fp)
2968 if (fp->fi_had_conflict)
2972 if (!fp->fi_lease) {
2973 status = nfs4_setlease(dp, flag);
2978 spin_lock(&recall_lock);
2979 if (fp->fi_had_conflict) {
2980 spin_unlock(&recall_lock);
2984 atomic_inc(&fp->fi_delegees);
2985 list_add(&dp->dl_perfile, &fp->fi_delegations);
2986 spin_unlock(&recall_lock);
2987 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2995 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2997 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2998 if (status == -EAGAIN)
2999 open->op_why_no_deleg = WND4_CONTENTION;
3001 open->op_why_no_deleg = WND4_RESOURCE;
3002 switch (open->op_deleg_want) {
3003 case NFS4_SHARE_WANT_READ_DELEG:
3004 case NFS4_SHARE_WANT_WRITE_DELEG:
3005 case NFS4_SHARE_WANT_ANY_DELEG:
3007 case NFS4_SHARE_WANT_CANCEL:
3008 open->op_why_no_deleg = WND4_CANCELLED;
3010 case NFS4_SHARE_WANT_NO_DELEG:
3017 * Attempt to hand out a delegation.
3020 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3021 struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3023 struct nfs4_delegation *dp;
3024 struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3026 int status = 0, flag = 0;
3028 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3029 flag = NFS4_OPEN_DELEGATE_NONE;
3030 open->op_recall = 0;
3031 switch (open->op_claim_type) {
3032 case NFS4_OPEN_CLAIM_PREVIOUS:
3034 open->op_recall = 1;
3035 flag = open->op_delegate_type;
3036 if (flag == NFS4_OPEN_DELEGATE_NONE)
3039 case NFS4_OPEN_CLAIM_NULL:
3040 /* Let's not give out any delegations till everyone's
3041 * had the chance to reclaim theirs.... */
3042 if (locks_in_grace(net))
3044 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3046 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3047 flag = NFS4_OPEN_DELEGATE_WRITE;
3049 flag = NFS4_OPEN_DELEGATE_READ;
3055 dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
3058 status = nfs4_set_delegation(dp, flag, stp->st_file);
3062 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3064 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3065 STATEID_VAL(&dp->dl_stid.sc_stateid));
3067 open->op_delegate_type = flag;
3068 if (flag == NFS4_OPEN_DELEGATE_NONE) {
3069 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3070 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
3071 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3073 /* 4.1 client asking for a delegation? */
3074 if (open->op_deleg_want)
3075 nfsd4_open_deleg_none_ext(open, status);
3079 unhash_stid(&dp->dl_stid);
3080 nfs4_put_delegation(dp);
3082 flag = NFS4_OPEN_DELEGATE_NONE;
3086 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3087 struct nfs4_delegation *dp)
3089 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3090 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3091 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3092 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3093 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3094 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3095 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3096 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3098 /* Otherwise the client must be confused wanting a delegation
3099 * it already has, therefore we don't return
3100 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3105 * called with nfs4_lock_state() held.
3108 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3110 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3111 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3112 struct nfs4_file *fp = NULL;
3113 struct inode *ino = current_fh->fh_dentry->d_inode;
3114 struct nfs4_ol_stateid *stp = NULL;
3115 struct nfs4_delegation *dp = NULL;
3119 * Lookup file; if found, lookup stateid and check open request,
3120 * and check for delegations in the process of being recalled.
3121 * If not found, create the nfs4_file struct
3123 fp = find_file(ino);
3125 if ((status = nfs4_check_open(fp, open, &stp)))
3127 status = nfs4_check_deleg(cl, open, &dp);
3131 status = nfserr_bad_stateid;
3132 if (nfsd4_is_deleg_cur(open))
3134 status = nfserr_jukebox;
3136 open->op_file = NULL;
3137 nfsd4_init_file(fp, ino);
3141 * OPEN the file, or upgrade an existing OPEN.
3142 * If truncate fails, the OPEN fails.
3145 /* Stateid was found, this is an OPEN upgrade */
3146 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3150 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3153 status = nfsd4_truncate(rqstp, current_fh, open);
3157 open->op_stp = NULL;
3158 init_open_stateid(stp, fp, open);
3160 update_stateid(&stp->st_stid.sc_stateid);
3161 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3163 if (nfsd4_has_session(&resp->cstate)) {
3164 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3166 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3167 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3168 open->op_why_no_deleg = WND4_NOT_WANTED;
3174 * Attempt to hand out a delegation. No error return, because the
3175 * OPEN succeeds even if we fail.
3177 nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3181 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3182 STATEID_VAL(&stp->st_stid.sc_stateid));
3184 /* 4.1 client trying to upgrade/downgrade delegation? */
3185 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3186 open->op_deleg_want)
3187 nfsd4_deleg_xgrade_none_ext(open, dp);
3191 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3192 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3194 * To finish the open response, we just need to set the rflags.
3196 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3197 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3198 !nfsd4_has_session(&resp->cstate))
3199 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3204 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3206 if (open->op_openowner) {
3207 struct nfs4_openowner *oo = open->op_openowner;
3209 if (!list_empty(&oo->oo_owner.so_stateids))
3210 list_del_init(&oo->oo_close_lru);
3211 if (oo->oo_flags & NFS4_OO_NEW) {
3213 release_openowner(oo);
3214 open->op_openowner = NULL;
3216 oo->oo_flags &= ~NFS4_OO_NEW;
3220 nfsd4_free_file(open->op_file);
3222 free_generic_stateid(open->op_stp);
3225 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3227 struct nfs4_client *found;
3229 if (STALE_CLIENTID(clid, nn))
3230 return nfserr_stale_clientid;
3231 found = find_confirmed_client(clid, session, nn);
3234 return found ? nfs_ok : nfserr_expired;
3238 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3241 struct nfs4_client *clp;
3243 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3246 dprintk("process_renew(%08x/%08x): starting\n",
3247 clid->cl_boot, clid->cl_id);
3248 status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3251 status = nfserr_cb_path_down;
3252 if (!list_empty(&clp->cl_delegations)
3253 && clp->cl_cb_state != NFSD4_CB_UP)
3257 nfs4_unlock_state();
3262 nfsd4_end_grace(struct nfsd_net *nn)
3264 /* do nothing if grace period already ended */
3265 if (nn->grace_ended)
3268 dprintk("NFSD: end of grace period\n");
3269 nn->grace_ended = true;
3270 nfsd4_record_grace_done(nn, nn->boot_time);
3271 locks_end_grace(&nn->nfsd4_manager);
3273 * Now that every NFSv4 client has had the chance to recover and
3274 * to see the (possibly new, possibly shorter) lease time, we
3275 * can safely set the next grace time to the current lease time:
3277 nn->nfsd4_grace = nn->nfsd4_lease;
3281 nfs4_laundromat(struct nfsd_net *nn)
3283 struct nfs4_client *clp;
3284 struct nfs4_openowner *oo;
3285 struct nfs4_delegation *dp;
3286 struct list_head *pos, *next, reaplist;
3287 time_t cutoff = get_seconds() - nn->nfsd4_lease;
3288 time_t t, clientid_val = nn->nfsd4_lease;
3289 time_t u, test_val = nn->nfsd4_lease;
3293 dprintk("NFSD: laundromat service - starting\n");
3294 nfsd4_end_grace(nn);
3295 INIT_LIST_HEAD(&reaplist);
3296 spin_lock(&nn->client_lock);
3297 list_for_each_safe(pos, next, &nn->client_lru) {
3298 clp = list_entry(pos, struct nfs4_client, cl_lru);
3299 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3300 t = clp->cl_time - cutoff;
3301 if (clientid_val > t)
3305 if (mark_client_expired_locked(clp)) {
3306 dprintk("NFSD: client in use (clientid %08x)\n",
3307 clp->cl_clientid.cl_id);
3310 list_move(&clp->cl_lru, &reaplist);
3312 spin_unlock(&nn->client_lock);
3313 list_for_each_safe(pos, next, &reaplist) {
3314 clp = list_entry(pos, struct nfs4_client, cl_lru);
3315 dprintk("NFSD: purging unused client (clientid %08x)\n",
3316 clp->cl_clientid.cl_id);
3319 spin_lock(&recall_lock);
3320 list_for_each_safe(pos, next, &nn->del_recall_lru) {
3321 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3322 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3324 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3325 u = dp->dl_time - cutoff;
3330 list_move(&dp->dl_recall_lru, &reaplist);
3332 spin_unlock(&recall_lock);
3333 list_for_each_safe(pos, next, &reaplist) {
3334 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3335 revoke_delegation(dp);
3337 test_val = nn->nfsd4_lease;
3338 list_for_each_safe(pos, next, &nn->close_lru) {
3339 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3340 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3341 u = oo->oo_time - cutoff;
3346 release_openowner(oo);
3348 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3349 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3350 nfs4_unlock_state();
3351 return clientid_val;
3354 static struct workqueue_struct *laundry_wq;
3355 static void laundromat_main(struct work_struct *);
3358 laundromat_main(struct work_struct *laundry)
3361 struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3363 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3366 t = nfs4_laundromat(nn);
3367 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3368 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3371 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3373 if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3374 return nfserr_bad_stateid;
3379 access_permit_read(struct nfs4_ol_stateid *stp)
3381 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3382 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3383 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3387 access_permit_write(struct nfs4_ol_stateid *stp)
3389 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3390 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3394 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3396 __be32 status = nfserr_openmode;
3398 /* For lock stateid's, we test the parent open, not the lock: */
3399 if (stp->st_openstp)
3400 stp = stp->st_openstp;
3401 if ((flags & WR_STATE) && !access_permit_write(stp))
3403 if ((flags & RD_STATE) && !access_permit_read(stp))
3410 static inline __be32
3411 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3413 if (ONE_STATEID(stateid) && (flags & RD_STATE))
3415 else if (locks_in_grace(net)) {
3416 /* Answer in remaining cases depends on existence of
3417 * conflicting state; so we must wait out the grace period. */
3418 return nfserr_grace;
3419 } else if (flags & WR_STATE)
3420 return nfs4_share_conflict(current_fh,
3421 NFS4_SHARE_DENY_WRITE);
3422 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3423 return nfs4_share_conflict(current_fh,
3424 NFS4_SHARE_DENY_READ);
3428 * Allow READ/WRITE during grace period on recovered state only for files
3429 * that are not able to provide mandatory locking.
3432 grace_disallows_io(struct net *net, struct inode *inode)
3434 return locks_in_grace(net) && mandatory_lock(inode);
3437 /* Returns true iff a is later than b: */
3438 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3440 return (s32)a->si_generation - (s32)b->si_generation > 0;
3443 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3446 * When sessions are used the stateid generation number is ignored
3449 if (has_session && in->si_generation == 0)
3452 if (in->si_generation == ref->si_generation)
3455 /* If the client sends us a stateid from the future, it's buggy: */
3456 if (stateid_generation_after(in, ref))
3457 return nfserr_bad_stateid;
3459 * However, we could see a stateid from the past, even from a
3460 * non-buggy client. For example, if the client sends a lock
3461 * while some IO is outstanding, the lock may bump si_generation
3462 * while the IO is still in flight. The client could avoid that
3463 * situation by waiting for responses on all the IO requests,
3464 * but better performance may result in retrying IO that
3465 * receives an old_stateid error if requests are rarely
3466 * reordered in flight:
3468 return nfserr_old_stateid;
3471 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3473 struct nfs4_stid *s;
3474 struct nfs4_ol_stateid *ols;
3477 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3478 return nfserr_bad_stateid;
3479 /* Client debugging aid. */
3480 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3481 char addr_str[INET6_ADDRSTRLEN];
3482 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3484 pr_warn_ratelimited("NFSD: client %s testing state ID "
3485 "with incorrect client ID\n", addr_str);
3486 return nfserr_bad_stateid;
3488 s = find_stateid(cl, stateid);
3490 return nfserr_bad_stateid;
3491 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3494 switch (s->sc_type) {
3495 case NFS4_DELEG_STID:
3497 case NFS4_REVOKED_DELEG_STID:
3498 return nfserr_deleg_revoked;
3499 case NFS4_OPEN_STID:
3500 case NFS4_LOCK_STID:
3501 ols = openlockstateid(s);
3502 if (ols->st_stateowner->so_is_open_owner
3503 && !(openowner(ols->st_stateowner)->oo_flags
3504 & NFS4_OO_CONFIRMED))
3505 return nfserr_bad_stateid;
3508 printk("unknown stateid type %x\n", s->sc_type);
3509 case NFS4_CLOSED_STID:
3510 return nfserr_bad_stateid;
3514 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3515 struct nfs4_stid **s, bool sessions,
3516 struct nfsd_net *nn)
3518 struct nfs4_client *cl;
3521 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3522 return nfserr_bad_stateid;
3523 status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3525 if (status == nfserr_stale_clientid)
3526 return nfserr_stale_stateid;
3529 *s = find_stateid_by_type(cl, stateid, typemask);
3531 return nfserr_bad_stateid;
3536 * Checks for stateid operations
3539 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3540 stateid_t *stateid, int flags, struct file **filpp)
3542 struct nfs4_stid *s;
3543 struct nfs4_ol_stateid *stp = NULL;
3544 struct nfs4_delegation *dp = NULL;
3545 struct svc_fh *current_fh = &cstate->current_fh;
3546 struct inode *ino = current_fh->fh_dentry->d_inode;
3547 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3553 if (grace_disallows_io(net, ino))
3554 return nfserr_grace;
3556 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3557 return check_special_stateids(net, current_fh, stateid, flags);
3559 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3560 &s, cstate->minorversion, nn);
3563 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3566 switch (s->sc_type) {
3567 case NFS4_DELEG_STID:
3568 dp = delegstateid(s);
3569 status = nfs4_check_delegmode(dp, flags);
3573 *filpp = dp->dl_file->fi_deleg_file;
3576 status = nfserr_serverfault;
3581 case NFS4_OPEN_STID:
3582 case NFS4_LOCK_STID:
3583 stp = openlockstateid(s);
3584 status = nfs4_check_fh(current_fh, stp);
3587 if (stp->st_stateowner->so_is_open_owner
3588 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3590 status = nfs4_check_openmode(stp, flags);
3594 if (flags & RD_STATE)
3595 *filpp = find_readable_file(stp->st_file);
3597 *filpp = find_writeable_file(stp->st_file);
3601 return nfserr_bad_stateid;
3609 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3611 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
3613 if (check_for_locks(stp->st_file, lo))
3614 return nfserr_locks_held;
3616 * Currently there's a 1-1 lock stateid<->lockowner
3617 * correspondance, and we have to delete the lockowner when we
3618 * delete the lock stateid:
3620 release_lockowner(lo);
3625 * Test if the stateid is valid
3628 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3629 struct nfsd4_test_stateid *test_stateid)
3631 struct nfsd4_test_stateid_id *stateid;
3632 struct nfs4_client *cl = cstate->session->se_client;
3635 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3636 stateid->ts_id_status =
3637 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3638 nfs4_unlock_state();
3644 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3645 struct nfsd4_free_stateid *free_stateid)
3647 stateid_t *stateid = &free_stateid->fr_stateid;
3648 struct nfs4_stid *s;
3649 struct nfs4_delegation *dp;
3650 struct nfs4_client *cl = cstate->session->se_client;
3651 __be32 ret = nfserr_bad_stateid;
3654 s = find_stateid(cl, stateid);
3657 switch (s->sc_type) {
3658 case NFS4_DELEG_STID:
3659 ret = nfserr_locks_held;
3661 case NFS4_OPEN_STID:
3662 case NFS4_LOCK_STID:
3663 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3666 if (s->sc_type == NFS4_LOCK_STID)
3667 ret = nfsd4_free_lock_stateid(openlockstateid(s));
3669 ret = nfserr_locks_held;
3671 case NFS4_REVOKED_DELEG_STID:
3672 dp = delegstateid(s);
3673 destroy_revoked_delegation(dp);
3677 ret = nfserr_bad_stateid;
3680 nfs4_unlock_state();
3687 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3688 RD_STATE : WR_STATE;
3691 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3693 struct svc_fh *current_fh = &cstate->current_fh;
3694 struct nfs4_stateowner *sop = stp->st_stateowner;
3697 status = nfsd4_check_seqid(cstate, sop, seqid);
3700 if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3701 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3703 * "Closed" stateid's exist *only* to return
3704 * nfserr_replay_me from the previous step, and
3705 * revoked delegations are kept only for free_stateid.
3707 return nfserr_bad_stateid;
3708 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3711 return nfs4_check_fh(current_fh, stp);
3715 * Checks for sequence id mutating operations.
3718 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3719 stateid_t *stateid, char typemask,
3720 struct nfs4_ol_stateid **stpp,
3721 struct nfsd_net *nn)
3724 struct nfs4_stid *s;
3726 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3727 seqid, STATEID_VAL(stateid));
3730 status = nfsd4_lookup_stateid(stateid, typemask, &s,
3731 cstate->minorversion, nn);
3734 *stpp = openlockstateid(s);
3735 if (!nfsd4_has_session(cstate))
3736 cstate->replay_owner = (*stpp)->st_stateowner;
3738 return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3741 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3742 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3745 struct nfs4_openowner *oo;
3747 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3748 NFS4_OPEN_STID, stpp, nn);
3751 oo = openowner((*stpp)->st_stateowner);
3752 if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3753 return nfserr_bad_stateid;
3758 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3759 struct nfsd4_open_confirm *oc)
3762 struct nfs4_openowner *oo;
3763 struct nfs4_ol_stateid *stp;
3764 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3766 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3767 (int)cstate->current_fh.fh_dentry->d_name.len,
3768 cstate->current_fh.fh_dentry->d_name.name);
3770 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3776 status = nfs4_preprocess_seqid_op(cstate,
3777 oc->oc_seqid, &oc->oc_req_stateid,
3778 NFS4_OPEN_STID, &stp, nn);
3781 oo = openowner(stp->st_stateowner);
3782 status = nfserr_bad_stateid;
3783 if (oo->oo_flags & NFS4_OO_CONFIRMED)
3785 oo->oo_flags |= NFS4_OO_CONFIRMED;
3786 update_stateid(&stp->st_stid.sc_stateid);
3787 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3788 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3789 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3791 nfsd4_client_record_create(oo->oo_owner.so_client);
3794 nfsd4_bump_seqid(cstate, status);
3795 if (!cstate->replay_owner)
3796 nfs4_unlock_state();
3800 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3802 if (!test_access(access, stp))
3804 nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3805 clear_access(access, stp);
3808 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3810 switch (to_access) {
3811 case NFS4_SHARE_ACCESS_READ:
3812 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3813 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3815 case NFS4_SHARE_ACCESS_WRITE:
3816 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3817 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3819 case NFS4_SHARE_ACCESS_BOTH:
3827 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3830 for (i = 0; i < 4; i++) {
3831 if ((i & deny) != i)
3837 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3838 struct nfsd4_compound_state *cstate,
3839 struct nfsd4_open_downgrade *od)
3842 struct nfs4_ol_stateid *stp;
3843 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3845 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3846 (int)cstate->current_fh.fh_dentry->d_name.len,
3847 cstate->current_fh.fh_dentry->d_name.name);
3849 /* We don't yet support WANT bits: */
3850 if (od->od_deleg_want)
3851 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3855 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3856 &od->od_stateid, &stp, nn);
3859 status = nfserr_inval;
3860 if (!test_access(od->od_share_access, stp)) {
3861 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3862 stp->st_access_bmap, od->od_share_access);
3865 if (!test_deny(od->od_share_deny, stp)) {
3866 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3867 stp->st_deny_bmap, od->od_share_deny);
3870 nfs4_stateid_downgrade(stp, od->od_share_access);
3872 reset_union_bmap_deny(od->od_share_deny, stp);
3874 update_stateid(&stp->st_stid.sc_stateid);
3875 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3878 nfsd4_bump_seqid(cstate, status);
3879 if (!cstate->replay_owner)
3880 nfs4_unlock_state();
3884 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3886 unhash_open_stateid(s);
3887 s->st_stid.sc_type = NFS4_CLOSED_STID;
3891 * nfs4_unlock_state() called after encode
3894 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3895 struct nfsd4_close *close)
3898 struct nfs4_openowner *oo;
3899 struct nfs4_ol_stateid *stp;
3900 struct net *net = SVC_NET(rqstp);
3901 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3903 dprintk("NFSD: nfsd4_close on file %.*s\n",
3904 (int)cstate->current_fh.fh_dentry->d_name.len,
3905 cstate->current_fh.fh_dentry->d_name.name);
3908 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3910 NFS4_OPEN_STID|NFS4_CLOSED_STID,
3912 nfsd4_bump_seqid(cstate, status);
3915 oo = openowner(stp->st_stateowner);
3916 update_stateid(&stp->st_stid.sc_stateid);
3917 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3919 nfsd4_close_open_stateid(stp);
3921 if (cstate->minorversion) {
3922 unhash_stid(&stp->st_stid);
3923 free_generic_stateid(stp);
3925 oo->oo_last_closed_stid = stp;
3927 if (list_empty(&oo->oo_owner.so_stateids)) {
3928 if (cstate->minorversion)
3929 release_openowner(oo);
3932 * In the 4.0 case we need to keep the owners around a
3933 * little while to handle CLOSE replay.
3935 move_to_close_lru(oo, SVC_NET(rqstp));
3939 if (!cstate->replay_owner)
3940 nfs4_unlock_state();
3945 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3946 struct nfsd4_delegreturn *dr)
3948 struct nfs4_delegation *dp;
3949 stateid_t *stateid = &dr->dr_stateid;
3950 struct nfs4_stid *s;
3952 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3954 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3958 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
3959 cstate->minorversion, nn);
3962 dp = delegstateid(s);
3963 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3967 destroy_delegation(dp);
3969 nfs4_unlock_state();
3975 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3977 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3980 end_offset(u64 start, u64 len)
3985 return end >= start ? end: NFS4_MAX_UINT64;
3988 /* last octet in a range */
3990 last_byte_offset(u64 start, u64 len)
3996 return end > start ? end - 1: NFS4_MAX_UINT64;
3999 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4001 return (file_hashval(inode) + cl_id
4002 + opaque_hashval(ownername->data, ownername->len))
4003 & LOCKOWNER_INO_HASH_MASK;
4007 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4008 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4009 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
4010 * locking, this prevents us from being completely protocol-compliant. The
4011 * real solution to this problem is to start using unsigned file offsets in
4012 * the VFS, but this is a very deep change!
4015 nfs4_transform_lock_offset(struct file_lock *lock)
4017 if (lock->fl_start < 0)
4018 lock->fl_start = OFFSET_MAX;
4019 if (lock->fl_end < 0)
4020 lock->fl_end = OFFSET_MAX;
4023 /* Hack!: For now, we're defining this just so we can use a pointer to it
4024 * as a unique cookie to identify our (NFSv4's) posix locks. */
4025 static const struct lock_manager_operations nfsd_posix_mng_ops = {
4029 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4031 struct nfs4_lockowner *lo;
4033 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4034 lo = (struct nfs4_lockowner *) fl->fl_owner;
4035 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4036 lo->lo_owner.so_owner.len, GFP_KERNEL);
4037 if (!deny->ld_owner.data)
4038 /* We just don't care that much */
4040 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4041 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4044 deny->ld_owner.len = 0;
4045 deny->ld_owner.data = NULL;
4046 deny->ld_clientid.cl_boot = 0;
4047 deny->ld_clientid.cl_id = 0;
4049 deny->ld_start = fl->fl_start;
4050 deny->ld_length = NFS4_MAX_UINT64;
4051 if (fl->fl_end != NFS4_MAX_UINT64)
4052 deny->ld_length = fl->fl_end - fl->fl_start + 1;
4053 deny->ld_type = NFS4_READ_LT;
4054 if (fl->fl_type != F_RDLCK)
4055 deny->ld_type = NFS4_WRITE_LT;
4058 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
4060 struct nfs4_ol_stateid *lst;
4062 if (!same_owner_str(&lo->lo_owner, owner, clid))
4064 if (list_empty(&lo->lo_owner.so_stateids)) {
4068 lst = list_first_entry(&lo->lo_owner.so_stateids,
4069 struct nfs4_ol_stateid, st_perstateowner);
4070 return lst->st_file->fi_inode == inode;
4073 static struct nfs4_lockowner *
4074 find_lockowner_str(struct inode *inode, clientid_t *clid,
4075 struct xdr_netobj *owner, struct nfsd_net *nn)
4077 unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4078 struct nfs4_lockowner *lo;
4080 list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4081 if (same_lockowner_ino(lo, inode, clid, owner))
4087 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4089 struct inode *inode = open_stp->st_file->fi_inode;
4090 unsigned int inohash = lockowner_ino_hashval(inode,
4091 clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4092 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4094 list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4095 list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4096 list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
4100 * Alloc a lock owner structure.
4101 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
4104 * strhashval = ownerstr_hashval
4107 static struct nfs4_lockowner *
4108 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4109 struct nfs4_lockowner *lo;
4111 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4114 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4115 lo->lo_owner.so_is_open_owner = 0;
4116 /* It is the openowner seqid that will be incremented in encode in the
4117 * case of new lockowners; so increment the lock seqid manually: */
4118 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4119 hash_lockowner(lo, strhashval, clp, open_stp);
4123 static struct nfs4_ol_stateid *
4124 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4126 struct nfs4_ol_stateid *stp;
4127 struct nfs4_client *clp = lo->lo_owner.so_client;
4129 stp = nfs4_alloc_stateid(clp);
4132 stp->st_stid.sc_type = NFS4_LOCK_STID;
4133 list_add(&stp->st_perfile, &fp->fi_stateids);
4134 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4135 stp->st_stateowner = &lo->lo_owner;
4138 stp->st_access_bmap = 0;
4139 stp->st_deny_bmap = open_stp->st_deny_bmap;
4140 stp->st_openstp = open_stp;
4145 check_lock_length(u64 offset, u64 length)
4147 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
4148 LOFF_OVERFLOW(offset, length)));
4151 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4153 struct nfs4_file *fp = lock_stp->st_file;
4154 int oflag = nfs4_access_to_omode(access);
4156 if (test_access(access, lock_stp))
4158 nfs4_file_get_access(fp, oflag);
4159 set_access(access, lock_stp);
4162 static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
4164 struct nfs4_file *fi = ost->st_file;
4165 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4166 struct nfs4_client *cl = oo->oo_owner.so_client;
4167 struct nfs4_lockowner *lo;
4168 unsigned int strhashval;
4169 struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4171 lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4172 &lock->v.new.owner, nn);
4174 if (!cstate->minorversion)
4175 return nfserr_bad_seqid;
4176 /* XXX: a lockowner always has exactly one stateid: */
4177 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4178 struct nfs4_ol_stateid, st_perstateowner);
4181 strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4182 &lock->v.new.owner);
4183 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4185 return nfserr_jukebox;
4186 *lst = alloc_init_lock_stateid(lo, fi, ost);
4188 release_lockowner(lo);
4189 return nfserr_jukebox;
4199 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4200 struct nfsd4_lock *lock)
4202 struct nfs4_openowner *open_sop = NULL;
4203 struct nfs4_lockowner *lock_sop = NULL;
4204 struct nfs4_ol_stateid *lock_stp;
4205 struct file *filp = NULL;
4206 struct file_lock *file_lock = NULL;
4207 struct file_lock *conflock = NULL;
4209 bool new_state = false;
4212 struct net *net = SVC_NET(rqstp);
4213 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4215 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4216 (long long) lock->lk_offset,
4217 (long long) lock->lk_length);
4219 if (check_lock_length(lock->lk_offset, lock->lk_length))
4220 return nfserr_inval;
4222 if ((status = fh_verify(rqstp, &cstate->current_fh,
4223 S_IFREG, NFSD_MAY_LOCK))) {
4224 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4230 if (lock->lk_is_new) {
4231 struct nfs4_ol_stateid *open_stp = NULL;
4233 if (nfsd4_has_session(cstate))
4234 /* See rfc 5661 18.10.3: given clientid is ignored: */
4235 memcpy(&lock->v.new.clientid,
4236 &cstate->session->se_client->cl_clientid,
4237 sizeof(clientid_t));
4239 status = nfserr_stale_clientid;
4240 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4243 /* validate and update open stateid and open seqid */
4244 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4245 lock->lk_new_open_seqid,
4246 &lock->lk_new_open_stateid,
4250 open_sop = openowner(open_stp->st_stateowner);
4251 status = nfserr_bad_stateid;
4252 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4253 &lock->v.new.clientid))
4255 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4256 &lock_stp, &new_state);
4258 status = nfs4_preprocess_seqid_op(cstate,
4259 lock->lk_old_lock_seqid,
4260 &lock->lk_old_lock_stateid,
4261 NFS4_LOCK_STID, &lock_stp, nn);
4264 lock_sop = lockowner(lock_stp->st_stateowner);
4266 lkflg = setlkflg(lock->lk_type);
4267 status = nfs4_check_openmode(lock_stp, lkflg);
4271 status = nfserr_grace;
4272 if (locks_in_grace(net) && !lock->lk_reclaim)
4274 status = nfserr_no_grace;
4275 if (!locks_in_grace(net) && lock->lk_reclaim)
4278 file_lock = locks_alloc_lock();
4280 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4281 status = nfserr_jukebox;
4285 locks_init_lock(file_lock);
4286 switch (lock->lk_type) {
4289 filp = find_readable_file(lock_stp->st_file);
4291 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4292 file_lock->fl_type = F_RDLCK;
4295 case NFS4_WRITEW_LT:
4296 filp = find_writeable_file(lock_stp->st_file);
4298 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4299 file_lock->fl_type = F_WRLCK;
4302 status = nfserr_inval;
4306 status = nfserr_openmode;
4309 file_lock->fl_owner = (fl_owner_t)lock_sop;
4310 file_lock->fl_pid = current->tgid;
4311 file_lock->fl_file = filp;
4312 file_lock->fl_flags = FL_POSIX;
4313 file_lock->fl_lmops = &nfsd_posix_mng_ops;
4314 file_lock->fl_start = lock->lk_offset;
4315 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4316 nfs4_transform_lock_offset(file_lock);
4318 conflock = locks_alloc_lock();
4320 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4321 status = nfserr_jukebox;
4325 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4327 case 0: /* success! */
4328 update_stateid(&lock_stp->st_stid.sc_stateid);
4329 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4333 case (EAGAIN): /* conflock holds conflicting lock */
4334 status = nfserr_denied;
4335 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4336 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4339 status = nfserr_deadlock;
4342 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4343 status = nfserrno(err);
4347 if (status && new_state)
4348 release_lockowner(lock_sop);
4349 nfsd4_bump_seqid(cstate, status);
4350 if (!cstate->replay_owner)
4351 nfs4_unlock_state();
4353 locks_free_lock(file_lock);
4355 locks_free_lock(conflock);
4360 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4361 * so we do a temporary open here just to get an open file to pass to
4362 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
4365 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4368 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4370 err = nfserrno(vfs_test_lock(file, lock));
4380 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4381 struct nfsd4_lockt *lockt)
4383 struct inode *inode;
4384 struct file_lock *file_lock = NULL;
4385 struct nfs4_lockowner *lo;
4387 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4389 if (locks_in_grace(SVC_NET(rqstp)))
4390 return nfserr_grace;
4392 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4393 return nfserr_inval;
4397 if (!nfsd4_has_session(cstate)) {
4398 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4403 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4406 inode = cstate->current_fh.fh_dentry->d_inode;
4407 file_lock = locks_alloc_lock();
4409 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4410 status = nfserr_jukebox;
4413 locks_init_lock(file_lock);
4414 switch (lockt->lt_type) {
4417 file_lock->fl_type = F_RDLCK;
4420 case NFS4_WRITEW_LT:
4421 file_lock->fl_type = F_WRLCK;
4424 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4425 status = nfserr_inval;
4429 lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4431 file_lock->fl_owner = (fl_owner_t)lo;
4432 file_lock->fl_pid = current->tgid;
4433 file_lock->fl_flags = FL_POSIX;
4435 file_lock->fl_start = lockt->lt_offset;
4436 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4438 nfs4_transform_lock_offset(file_lock);
4440 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4444 if (file_lock->fl_type != F_UNLCK) {
4445 status = nfserr_denied;
4446 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4449 nfs4_unlock_state();
4451 locks_free_lock(file_lock);
4456 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4457 struct nfsd4_locku *locku)
4459 struct nfs4_lockowner *lo;
4460 struct nfs4_ol_stateid *stp;
4461 struct file *filp = NULL;
4462 struct file_lock *file_lock = NULL;
4465 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4467 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4468 (long long) locku->lu_offset,
4469 (long long) locku->lu_length);
4471 if (check_lock_length(locku->lu_offset, locku->lu_length))
4472 return nfserr_inval;
4476 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4477 &locku->lu_stateid, NFS4_LOCK_STID,
4481 filp = find_any_file(stp->st_file);
4483 status = nfserr_lock_range;
4486 file_lock = locks_alloc_lock();
4488 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4489 status = nfserr_jukebox;
4492 lo = lockowner(stp->st_stateowner);
4493 locks_init_lock(file_lock);
4494 file_lock->fl_type = F_UNLCK;
4495 file_lock->fl_owner = (fl_owner_t)lo;
4496 file_lock->fl_pid = current->tgid;
4497 file_lock->fl_file = filp;
4498 file_lock->fl_flags = FL_POSIX;
4499 file_lock->fl_lmops = &nfsd_posix_mng_ops;
4500 file_lock->fl_start = locku->lu_offset;
4502 file_lock->fl_end = last_byte_offset(locku->lu_offset,
4504 nfs4_transform_lock_offset(file_lock);
4506 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4508 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4511 update_stateid(&stp->st_stid.sc_stateid);
4512 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4514 if (nfsd4_has_session(cstate) && !check_for_locks(stp->st_file, lo)) {
4515 WARN_ON_ONCE(cstate->replay_owner);
4516 release_lockowner(lo);
4520 nfsd4_bump_seqid(cstate, status);
4521 if (!cstate->replay_owner)
4522 nfs4_unlock_state();
4524 locks_free_lock(file_lock);
4528 status = nfserrno(err);
4534 * 1: locks held by lockowner
4535 * 0: no locks held by lockowner
4538 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4540 struct file_lock **flpp;
4541 struct inode *inode = filp->fi_inode;
4545 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4546 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4557 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4558 struct nfsd4_compound_state *cstate,
4559 struct nfsd4_release_lockowner *rlockowner)
4561 clientid_t *clid = &rlockowner->rl_clientid;
4562 struct nfs4_stateowner *sop;
4563 struct nfs4_lockowner *lo;
4564 struct nfs4_ol_stateid *stp;
4565 struct xdr_netobj *owner = &rlockowner->rl_owner;
4566 struct list_head matches;
4567 unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4569 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4571 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4572 clid->cl_boot, clid->cl_id);
4576 status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4580 status = nfserr_locks_held;
4581 INIT_LIST_HEAD(&matches);
4583 list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4584 if (sop->so_is_open_owner)
4586 if (!same_owner_str(sop, owner, clid))
4588 list_for_each_entry(stp, &sop->so_stateids,
4590 lo = lockowner(sop);
4591 if (check_for_locks(stp->st_file, lo))
4593 list_add(&lo->lo_list, &matches);
4596 /* Clients probably won't expect us to return with some (but not all)
4597 * of the lockowner state released; so don't release any until all
4598 * have been checked. */
4600 while (!list_empty(&matches)) {
4601 lo = list_entry(matches.next, struct nfs4_lockowner,
4603 /* unhash_stateowner deletes so_perclient only
4604 * for openowners. */
4605 list_del(&lo->lo_list);
4606 release_lockowner(lo);
4609 nfs4_unlock_state();
4613 static inline struct nfs4_client_reclaim *
4616 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4620 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4622 struct nfs4_client_reclaim *crp;
4624 crp = nfsd4_find_reclaim_client(name, nn);
4625 return (crp && crp->cr_clp);
4629 * failure => all reset bets are off, nfserr_no_grace...
4631 struct nfs4_client_reclaim *
4632 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4634 unsigned int strhashval;
4635 struct nfs4_client_reclaim *crp;
4637 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4638 crp = alloc_reclaim();
4640 strhashval = clientstr_hashval(name);
4641 INIT_LIST_HEAD(&crp->cr_strhash);
4642 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4643 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4645 nn->reclaim_str_hashtbl_size++;
4651 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4653 list_del(&crp->cr_strhash);
4655 nn->reclaim_str_hashtbl_size--;
4659 nfs4_release_reclaim(struct nfsd_net *nn)
4661 struct nfs4_client_reclaim *crp = NULL;
4664 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4665 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4666 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4667 struct nfs4_client_reclaim, cr_strhash);
4668 nfs4_remove_reclaim_record(crp, nn);
4671 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4675 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4676 struct nfs4_client_reclaim *
4677 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4679 unsigned int strhashval;
4680 struct nfs4_client_reclaim *crp = NULL;
4682 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4684 strhashval = clientstr_hashval(recdir);
4685 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4686 if (same_name(crp->cr_recdir, recdir)) {
4694 * Called from OPEN. Look for clientid in reclaim list.
4697 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4699 struct nfs4_client *clp;
4701 /* find clientid in conf_id_hashtbl */
4702 clp = find_confirmed_client(clid, sessions, nn);
4704 return nfserr_reclaim_bad;
4706 return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4709 #ifdef CONFIG_NFSD_FAULT_INJECTION
4711 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4713 if (mark_client_expired(clp))
4719 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4721 char buf[INET6_ADDRSTRLEN];
4722 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4723 printk(KERN_INFO "NFS Client: %s\n", buf);
4727 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4730 char buf[INET6_ADDRSTRLEN];
4731 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4732 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4735 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4737 struct nfs4_openowner *oop;
4738 struct nfs4_lockowner *lop, *lo_next;
4739 struct nfs4_ol_stateid *stp, *st_next;
4742 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4743 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4744 list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4756 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4758 return nfsd_foreach_client_lock(clp, max, release_lockowner);
4761 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4763 u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4764 nfsd_print_count(clp, count, "locked files");
4768 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4770 struct nfs4_openowner *oop, *next;
4773 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4783 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4785 return nfsd_foreach_client_open(clp, max, release_openowner);
4788 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4790 u64 count = nfsd_foreach_client_open(clp, max, NULL);
4791 nfsd_print_count(clp, count, "open files");
4795 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4796 struct list_head *victims)
4798 struct nfs4_delegation *dp, *next;
4801 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4803 list_move(&dp->dl_recall_lru, victims);
4810 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4812 struct nfs4_delegation *dp, *next;
4816 spin_lock(&recall_lock);
4817 count = nfsd_find_all_delegations(clp, max, &victims);
4818 spin_unlock(&recall_lock);
4820 list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4821 revoke_delegation(dp);
4826 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4828 struct nfs4_delegation *dp, *next;
4832 spin_lock(&recall_lock);
4833 count = nfsd_find_all_delegations(clp, max, &victims);
4834 list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4835 nfsd_break_one_deleg(dp);
4836 spin_unlock(&recall_lock);
4841 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4845 spin_lock(&recall_lock);
4846 count = nfsd_find_all_delegations(clp, max, NULL);
4847 spin_unlock(&recall_lock);
4849 nfsd_print_count(clp, count, "delegations");
4853 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4855 struct nfs4_client *clp, *next;
4857 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4859 if (!nfsd_netns_ready(nn))
4862 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4863 count += func(clp, max - count);
4864 if ((max != 0) && (count >= max))
4871 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4873 struct nfs4_client *clp;
4874 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4876 if (!nfsd_netns_ready(nn))
4879 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4880 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
4886 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4888 /* initialization to perform at module load time: */
4891 nfs4_state_init(void)
4896 * Since the lifetime of a delegation isn't limited to that of an open, a
4897 * client may quite reasonably hang on to a delegation as long as it has
4898 * the inode cached. This becomes an obvious problem the first time a
4899 * client's inode cache approaches the size of the server's total memory.
4901 * For now we avoid this problem by imposing a hard limit on the number
4902 * of delegations, which varies according to the server's memory size.
4905 set_max_delegations(void)
4908 * Allow at most 4 delegations per megabyte of RAM. Quick
4909 * estimates suggest that in the worst case (where every delegation
4910 * is for a different inode), a delegation could take about 1.5K,
4911 * giving a worst case usage of about 6% of memory.
4913 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4916 static int nfs4_state_create_net(struct net *net)
4918 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4921 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4922 CLIENT_HASH_SIZE, GFP_KERNEL);
4923 if (!nn->conf_id_hashtbl)
4925 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4926 CLIENT_HASH_SIZE, GFP_KERNEL);
4927 if (!nn->unconf_id_hashtbl)
4929 nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
4930 OWNER_HASH_SIZE, GFP_KERNEL);
4931 if (!nn->ownerstr_hashtbl)
4933 nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
4934 LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
4935 if (!nn->lockowner_ino_hashtbl)
4936 goto err_lockowner_ino;
4937 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
4938 SESSION_HASH_SIZE, GFP_KERNEL);
4939 if (!nn->sessionid_hashtbl)
4942 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4943 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
4944 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
4946 for (i = 0; i < OWNER_HASH_SIZE; i++)
4947 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
4948 for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4949 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
4950 for (i = 0; i < SESSION_HASH_SIZE; i++)
4951 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
4952 nn->conf_name_tree = RB_ROOT;
4953 nn->unconf_name_tree = RB_ROOT;
4954 INIT_LIST_HEAD(&nn->client_lru);
4955 INIT_LIST_HEAD(&nn->close_lru);
4956 INIT_LIST_HEAD(&nn->del_recall_lru);
4957 spin_lock_init(&nn->client_lock);
4959 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
4965 kfree(nn->lockowner_ino_hashtbl);
4967 kfree(nn->ownerstr_hashtbl);
4969 kfree(nn->unconf_id_hashtbl);
4971 kfree(nn->conf_id_hashtbl);
4977 nfs4_state_destroy_net(struct net *net)
4980 struct nfs4_client *clp = NULL;
4981 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4983 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4984 while (!list_empty(&nn->conf_id_hashtbl[i])) {
4985 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4986 destroy_client(clp);
4990 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4991 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
4992 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4993 destroy_client(clp);
4997 kfree(nn->sessionid_hashtbl);
4998 kfree(nn->lockowner_ino_hashtbl);
4999 kfree(nn->ownerstr_hashtbl);
5000 kfree(nn->unconf_id_hashtbl);
5001 kfree(nn->conf_id_hashtbl);
5006 nfs4_state_start_net(struct net *net)
5008 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5011 ret = nfs4_state_create_net(net);
5014 nfsd4_client_tracking_init(net);
5015 nn->boot_time = get_seconds();
5016 locks_start_grace(net, &nn->nfsd4_manager);
5017 nn->grace_ended = false;
5018 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5019 nn->nfsd4_grace, net);
5020 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5024 /* initialization to perform when the nfsd service is started: */
5027 nfs4_state_start(void)
5031 ret = set_callback_cred();
5034 laundry_wq = create_singlethread_workqueue("nfsd4");
5035 if (laundry_wq == NULL) {
5039 ret = nfsd4_create_callback_queue();
5041 goto out_free_laundry;
5043 set_max_delegations();
5048 destroy_workqueue(laundry_wq);
5053 /* should be called with the state lock held */
5055 nfs4_state_shutdown_net(struct net *net)
5057 struct nfs4_delegation *dp = NULL;
5058 struct list_head *pos, *next, reaplist;
5059 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5061 cancel_delayed_work_sync(&nn->laundromat_work);
5062 locks_end_grace(&nn->nfsd4_manager);
5064 INIT_LIST_HEAD(&reaplist);
5065 spin_lock(&recall_lock);
5066 list_for_each_safe(pos, next, &nn->del_recall_lru) {
5067 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5068 list_move(&dp->dl_recall_lru, &reaplist);
5070 spin_unlock(&recall_lock);
5071 list_for_each_safe(pos, next, &reaplist) {
5072 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5073 destroy_delegation(dp);
5076 nfsd4_client_tracking_exit(net);
5077 nfs4_state_destroy_net(net);
5081 nfs4_state_shutdown(void)
5083 destroy_workqueue(laundry_wq);
5084 nfsd4_destroy_callback_queue();
5088 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5090 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5091 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5095 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5097 if (cstate->minorversion) {
5098 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5099 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5104 clear_current_stateid(struct nfsd4_compound_state *cstate)
5106 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5110 * functions to set current state id
5113 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5115 put_stateid(cstate, &odp->od_stateid);
5119 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5121 put_stateid(cstate, &open->op_stateid);
5125 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5127 put_stateid(cstate, &close->cl_stateid);
5131 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5133 put_stateid(cstate, &lock->lk_resp_stateid);
5137 * functions to consume current state id
5141 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5143 get_stateid(cstate, &odp->od_stateid);
5147 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5149 get_stateid(cstate, &drp->dr_stateid);
5153 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5155 get_stateid(cstate, &fsp->fr_stateid);
5159 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5161 get_stateid(cstate, &setattr->sa_stateid);
5165 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5167 get_stateid(cstate, &close->cl_stateid);
5171 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5173 get_stateid(cstate, &locku->lu_stateid);
5177 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5179 get_stateid(cstate, &read->rd_stateid);
5183 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5185 get_stateid(cstate, &write->wr_stateid);