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(state_lock);
86 static struct kmem_cache *openowner_slab;
87 static struct kmem_cache *lockowner_slab;
88 static struct kmem_cache *file_slab;
89 static struct kmem_cache *stateid_slab;
90 static struct kmem_cache *deleg_slab;
95 mutex_lock(&client_mutex);
98 static void free_session(struct nfsd4_session *);
100 static bool is_session_dead(struct nfsd4_session *ses)
102 return ses->se_flags & NFS4_SESSION_DEAD;
105 void nfsd4_put_session(struct nfsd4_session *ses)
107 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
111 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
113 if (atomic_read(&ses->se_ref) > ref_held_by_me)
114 return nfserr_jukebox;
115 ses->se_flags |= NFS4_SESSION_DEAD;
119 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
121 if (is_session_dead(ses))
122 return nfserr_badsession;
123 atomic_inc(&ses->se_ref);
128 nfs4_unlock_state(void)
130 mutex_unlock(&client_mutex);
133 static bool is_client_expired(struct nfs4_client *clp)
135 return clp->cl_time == 0;
138 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
140 if (atomic_read(&clp->cl_refcount))
141 return nfserr_jukebox;
146 static __be32 mark_client_expired(struct nfs4_client *clp)
148 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
151 spin_lock(&nn->client_lock);
152 ret = mark_client_expired_locked(clp);
153 spin_unlock(&nn->client_lock);
157 static __be32 get_client_locked(struct nfs4_client *clp)
159 if (is_client_expired(clp))
160 return nfserr_expired;
161 atomic_inc(&clp->cl_refcount);
165 /* must be called under the client_lock */
167 renew_client_locked(struct nfs4_client *clp)
169 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
171 if (is_client_expired(clp)) {
173 printk("%s: client (clientid %08x/%08x) already expired\n",
175 clp->cl_clientid.cl_boot,
176 clp->cl_clientid.cl_id);
180 dprintk("renewing client (clientid %08x/%08x)\n",
181 clp->cl_clientid.cl_boot,
182 clp->cl_clientid.cl_id);
183 list_move_tail(&clp->cl_lru, &nn->client_lru);
184 clp->cl_time = get_seconds();
188 renew_client(struct nfs4_client *clp)
190 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
192 spin_lock(&nn->client_lock);
193 renew_client_locked(clp);
194 spin_unlock(&nn->client_lock);
197 static void put_client_renew_locked(struct nfs4_client *clp)
199 if (!atomic_dec_and_test(&clp->cl_refcount))
201 if (!is_client_expired(clp))
202 renew_client_locked(clp);
205 void put_client_renew(struct nfs4_client *clp)
207 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
209 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
211 if (!is_client_expired(clp))
212 renew_client_locked(clp);
213 spin_unlock(&nn->client_lock);
218 opaque_hashval(const void *ptr, int nbytes)
220 unsigned char *cptr = (unsigned char *) ptr;
230 static void nfsd4_free_file(struct nfs4_file *f)
232 kmem_cache_free(file_slab, f);
236 put_nfs4_file(struct nfs4_file *fi)
238 if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
239 hlist_del(&fi->fi_hash);
240 spin_unlock(&state_lock);
247 get_nfs4_file(struct nfs4_file *fi)
249 atomic_inc(&fi->fi_ref);
252 static int num_delegations;
253 unsigned long max_delegations;
256 * Open owner state (share locks)
259 /* hash tables for lock and open owners */
260 #define OWNER_HASH_BITS 8
261 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
262 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
264 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
268 ret = opaque_hashval(ownername->data, ownername->len);
270 return ret & OWNER_HASH_MASK;
273 /* hash table for nfs4_file */
274 #define FILE_HASH_BITS 8
275 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
277 static unsigned int file_hashval(struct inode *ino)
279 /* XXX: why are we hashing on inode pointer, anyway? */
280 return hash_ptr(ino, FILE_HASH_BITS);
283 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
285 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
287 WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
288 atomic_inc(&fp->fi_access[oflag]);
291 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
293 if (oflag == O_RDWR) {
294 __nfs4_file_get_access(fp, O_RDONLY);
295 __nfs4_file_get_access(fp, O_WRONLY);
297 __nfs4_file_get_access(fp, oflag);
300 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
302 if (fp->fi_fds[oflag]) {
303 fput(fp->fi_fds[oflag]);
304 fp->fi_fds[oflag] = NULL;
308 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
310 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
311 nfs4_file_put_fd(fp, oflag);
312 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
313 nfs4_file_put_fd(fp, O_RDWR);
317 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
319 if (oflag == O_RDWR) {
320 __nfs4_file_put_access(fp, O_RDONLY);
321 __nfs4_file_put_access(fp, O_WRONLY);
323 __nfs4_file_put_access(fp, oflag);
326 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
329 struct idr *stateids = &cl->cl_stateids;
330 struct nfs4_stid *stid;
333 stid = kmem_cache_alloc(slab, GFP_KERNEL);
337 new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
340 stid->sc_client = cl;
342 stid->sc_stateid.si_opaque.so_id = new_id;
343 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
344 /* Will be incremented before return to client: */
345 stid->sc_stateid.si_generation = 0;
348 * It shouldn't be a problem to reuse an opaque stateid value.
349 * I don't think it is for 4.1. But with 4.0 I worry that, for
350 * example, a stray write retransmission could be accepted by
351 * the server when it should have been rejected. Therefore,
352 * adopt a trick from the sctp code to attempt to maximize the
353 * amount of time until an id is reused, by ensuring they always
354 * "increase" (mod INT_MAX):
358 kmem_cache_free(slab, stid);
362 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
364 return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
367 static struct nfs4_delegation *
368 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
370 struct nfs4_delegation *dp;
372 dprintk("NFSD alloc_init_deleg\n");
373 if (num_delegations > max_delegations)
375 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
379 * delegation seqid's are never incremented. The 4.1 special
380 * meaning of seqid 0 isn't meaningful, really, but let's avoid
381 * 0 anyway just for consistency and use 1:
383 dp->dl_stid.sc_stateid.si_generation = 1;
385 INIT_LIST_HEAD(&dp->dl_perfile);
386 INIT_LIST_HEAD(&dp->dl_perclnt);
387 INIT_LIST_HEAD(&dp->dl_recall_lru);
389 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
390 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
392 atomic_set(&dp->dl_count, 1);
393 nfsd4_init_callback(&dp->dl_recall);
397 static void remove_stid(struct nfs4_stid *s)
399 struct idr *stateids = &s->sc_client->cl_stateids;
401 idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
404 static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
406 kmem_cache_free(slab, s);
410 nfs4_put_delegation(struct nfs4_delegation *dp)
412 if (atomic_dec_and_test(&dp->dl_count)) {
413 nfs4_free_stid(deleg_slab, &dp->dl_stid);
418 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)
436 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
438 lockdep_assert_held(&state_lock);
440 dp->dl_stid.sc_type = NFS4_DELEG_STID;
441 list_add(&dp->dl_perfile, &fp->fi_delegations);
442 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
445 /* Called under the state lock. */
447 unhash_delegation(struct nfs4_delegation *dp)
449 spin_lock(&state_lock);
450 list_del_init(&dp->dl_perclnt);
451 list_del_init(&dp->dl_perfile);
452 list_del_init(&dp->dl_recall_lru);
453 spin_unlock(&state_lock);
455 nfs4_put_deleg_lease(dp->dl_file);
456 put_nfs4_file(dp->dl_file);
463 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
465 list_del_init(&dp->dl_recall_lru);
466 remove_stid(&dp->dl_stid);
467 nfs4_put_delegation(dp);
470 static void destroy_delegation(struct nfs4_delegation *dp)
472 unhash_delegation(dp);
473 remove_stid(&dp->dl_stid);
474 nfs4_put_delegation(dp);
477 static void revoke_delegation(struct nfs4_delegation *dp)
479 struct nfs4_client *clp = dp->dl_stid.sc_client;
481 if (clp->cl_minorversion == 0)
482 destroy_delegation(dp);
484 unhash_delegation(dp);
485 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
486 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
494 static unsigned int clientid_hashval(u32 id)
496 return id & CLIENT_HASH_MASK;
499 static unsigned int clientstr_hashval(const char *name)
501 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
505 * We store the NONE, READ, WRITE, and BOTH bits separately in the
506 * st_{access,deny}_bmap field of the stateid, in order to track not
507 * only what share bits are currently in force, but also what
508 * combinations of share bits previous opens have used. This allows us
509 * to enforce the recommendation of rfc 3530 14.2.19 that the server
510 * return an error if the client attempt to downgrade to a combination
511 * of share bits not explicable by closing some of its previous opens.
513 * XXX: This enforcement is actually incomplete, since we don't keep
514 * track of access/deny bit combinations; so, e.g., we allow:
516 * OPEN allow read, deny write
517 * OPEN allow both, deny none
518 * DOWNGRADE allow read, deny none
520 * which we should reject.
523 bmap_to_share_mode(unsigned long bmap) {
525 unsigned int access = 0;
527 for (i = 1; i < 4; i++) {
528 if (test_bit(i, &bmap))
535 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
536 unsigned int access, deny;
538 access = bmap_to_share_mode(stp->st_access_bmap);
539 deny = bmap_to_share_mode(stp->st_deny_bmap);
540 if ((access & open->op_share_deny) || (deny & open->op_share_access))
545 /* set share access for a given stateid */
547 set_access(u32 access, struct nfs4_ol_stateid *stp)
549 __set_bit(access, &stp->st_access_bmap);
552 /* clear share access for a given stateid */
554 clear_access(u32 access, struct nfs4_ol_stateid *stp)
556 __clear_bit(access, &stp->st_access_bmap);
559 /* test whether a given stateid has access */
561 test_access(u32 access, struct nfs4_ol_stateid *stp)
563 return test_bit(access, &stp->st_access_bmap);
566 /* set share deny for a given stateid */
568 set_deny(u32 access, struct nfs4_ol_stateid *stp)
570 __set_bit(access, &stp->st_deny_bmap);
573 /* clear share deny for a given stateid */
575 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
577 __clear_bit(access, &stp->st_deny_bmap);
580 /* test whether a given stateid is denying specific access */
582 test_deny(u32 access, struct nfs4_ol_stateid *stp)
584 return test_bit(access, &stp->st_deny_bmap);
587 static int nfs4_access_to_omode(u32 access)
589 switch (access & NFS4_SHARE_ACCESS_BOTH) {
590 case NFS4_SHARE_ACCESS_READ:
592 case NFS4_SHARE_ACCESS_WRITE:
594 case NFS4_SHARE_ACCESS_BOTH:
601 /* release all access and file references for a given stateid */
603 release_all_access(struct nfs4_ol_stateid *stp)
607 for (i = 1; i < 4; i++) {
608 if (test_access(i, stp))
609 nfs4_file_put_access(stp->st_file,
610 nfs4_access_to_omode(i));
611 clear_access(i, stp);
615 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
617 list_del(&stp->st_perfile);
618 list_del(&stp->st_perstateowner);
621 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
623 release_all_access(stp);
624 put_nfs4_file(stp->st_file);
628 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
630 remove_stid(&stp->st_stid);
631 nfs4_free_stid(stateid_slab, &stp->st_stid);
634 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
638 unhash_generic_stateid(stp);
639 unhash_stid(&stp->st_stid);
640 file = find_any_file(stp->st_file);
642 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
643 close_generic_stateid(stp);
644 free_generic_stateid(stp);
647 static void unhash_lockowner(struct nfs4_lockowner *lo)
649 struct nfs4_ol_stateid *stp;
651 list_del(&lo->lo_owner.so_strhash);
652 list_del(&lo->lo_perstateid);
653 list_del(&lo->lo_owner_ino_hash);
654 while (!list_empty(&lo->lo_owner.so_stateids)) {
655 stp = list_first_entry(&lo->lo_owner.so_stateids,
656 struct nfs4_ol_stateid, st_perstateowner);
657 release_lock_stateid(stp);
661 static void nfs4_free_lockowner(struct nfs4_lockowner *lo)
663 kfree(lo->lo_owner.so_owner.data);
664 kmem_cache_free(lockowner_slab, lo);
667 static void release_lockowner(struct nfs4_lockowner *lo)
669 unhash_lockowner(lo);
670 nfs4_free_lockowner(lo);
674 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
676 struct nfs4_lockowner *lo;
678 while (!list_empty(&open_stp->st_lockowners)) {
679 lo = list_entry(open_stp->st_lockowners.next,
680 struct nfs4_lockowner, lo_perstateid);
681 release_lockowner(lo);
685 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
687 unhash_generic_stateid(stp);
688 release_stateid_lockowners(stp);
689 close_generic_stateid(stp);
692 static void release_open_stateid(struct nfs4_ol_stateid *stp)
694 unhash_open_stateid(stp);
695 free_generic_stateid(stp);
698 static void unhash_openowner(struct nfs4_openowner *oo)
700 struct nfs4_ol_stateid *stp;
702 list_del(&oo->oo_owner.so_strhash);
703 list_del(&oo->oo_perclient);
704 while (!list_empty(&oo->oo_owner.so_stateids)) {
705 stp = list_first_entry(&oo->oo_owner.so_stateids,
706 struct nfs4_ol_stateid, st_perstateowner);
707 release_open_stateid(stp);
711 static void release_last_closed_stateid(struct nfs4_openowner *oo)
713 struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
716 free_generic_stateid(s);
717 oo->oo_last_closed_stid = NULL;
721 static void nfs4_free_openowner(struct nfs4_openowner *oo)
723 kfree(oo->oo_owner.so_owner.data);
724 kmem_cache_free(openowner_slab, oo);
727 static void release_openowner(struct nfs4_openowner *oo)
729 unhash_openowner(oo);
730 list_del(&oo->oo_close_lru);
731 release_last_closed_stateid(oo);
732 nfs4_free_openowner(oo);
736 hash_sessionid(struct nfs4_sessionid *sessionid)
738 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
740 return sid->sequence % SESSION_HASH_SIZE;
745 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
747 u32 *ptr = (u32 *)(&sessionid->data[0]);
748 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
752 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
758 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
759 * won't be used for replay.
761 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
763 struct nfs4_stateowner *so = cstate->replay_owner;
765 if (nfserr == nfserr_replay_me)
768 if (!seqid_mutating_err(ntohl(nfserr))) {
769 cstate->replay_owner = NULL;
774 if (so->so_is_open_owner)
775 release_last_closed_stateid(openowner(so));
781 gen_sessionid(struct nfsd4_session *ses)
783 struct nfs4_client *clp = ses->se_client;
784 struct nfsd4_sessionid *sid;
786 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
787 sid->clientid = clp->cl_clientid;
788 sid->sequence = current_sessionid++;
793 * The protocol defines ca_maxresponssize_cached to include the size of
794 * the rpc header, but all we need to cache is the data starting after
795 * the end of the initial SEQUENCE operation--the rest we regenerate
796 * each time. Therefore we can advertise a ca_maxresponssize_cached
797 * value that is the number of bytes in our cache plus a few additional
798 * bytes. In order to stay on the safe side, and not promise more than
799 * we can cache, those additional bytes must be the minimum possible: 24
800 * bytes of rpc header (xid through accept state, with AUTH_NULL
801 * verifier), 12 for the compound header (with zero-length tag), and 44
802 * for the SEQUENCE op response:
804 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
807 free_session_slots(struct nfsd4_session *ses)
811 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
812 kfree(ses->se_slots[i]);
816 * We don't actually need to cache the rpc and session headers, so we
817 * can allocate a little less for each slot:
819 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
823 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
826 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
827 return size + sizeof(struct nfsd4_slot);
831 * XXX: If we run out of reserved DRC memory we could (up to a point)
832 * re-negotiate active sessions and reduce their slot usage to make
833 * room for new connections. For now we just fail the create session.
835 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
837 u32 slotsize = slot_bytes(ca);
838 u32 num = ca->maxreqs;
841 spin_lock(&nfsd_drc_lock);
842 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
843 nfsd_drc_max_mem - nfsd_drc_mem_used);
844 num = min_t(int, num, avail / slotsize);
845 nfsd_drc_mem_used += num * slotsize;
846 spin_unlock(&nfsd_drc_lock);
851 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
853 int slotsize = slot_bytes(ca);
855 spin_lock(&nfsd_drc_lock);
856 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
857 spin_unlock(&nfsd_drc_lock);
860 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
861 struct nfsd4_channel_attrs *battrs)
863 int numslots = fattrs->maxreqs;
864 int slotsize = slot_bytes(fattrs);
865 struct nfsd4_session *new;
868 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
869 + sizeof(struct nfsd4_session) > PAGE_SIZE);
870 mem = numslots * sizeof(struct nfsd4_slot *);
872 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
875 /* allocate each struct nfsd4_slot and data cache in one piece */
876 for (i = 0; i < numslots; i++) {
877 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
878 if (!new->se_slots[i])
882 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
883 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
888 kfree(new->se_slots[i]);
893 static void free_conn(struct nfsd4_conn *c)
895 svc_xprt_put(c->cn_xprt);
899 static void nfsd4_conn_lost(struct svc_xpt_user *u)
901 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
902 struct nfs4_client *clp = c->cn_session->se_client;
904 spin_lock(&clp->cl_lock);
905 if (!list_empty(&c->cn_persession)) {
906 list_del(&c->cn_persession);
909 nfsd4_probe_callback(clp);
910 spin_unlock(&clp->cl_lock);
913 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
915 struct nfsd4_conn *conn;
917 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
920 svc_xprt_get(rqstp->rq_xprt);
921 conn->cn_xprt = rqstp->rq_xprt;
922 conn->cn_flags = flags;
923 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
927 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
929 conn->cn_session = ses;
930 list_add(&conn->cn_persession, &ses->se_conns);
933 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
935 struct nfs4_client *clp = ses->se_client;
937 spin_lock(&clp->cl_lock);
938 __nfsd4_hash_conn(conn, ses);
939 spin_unlock(&clp->cl_lock);
942 static int nfsd4_register_conn(struct nfsd4_conn *conn)
944 conn->cn_xpt_user.callback = nfsd4_conn_lost;
945 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
948 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
952 nfsd4_hash_conn(conn, ses);
953 ret = nfsd4_register_conn(conn);
955 /* oops; xprt is already down: */
956 nfsd4_conn_lost(&conn->cn_xpt_user);
957 if (conn->cn_flags & NFS4_CDFC4_BACK) {
958 /* callback channel may be back up */
959 nfsd4_probe_callback(ses->se_client);
963 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
965 u32 dir = NFS4_CDFC4_FORE;
967 if (cses->flags & SESSION4_BACK_CHAN)
968 dir |= NFS4_CDFC4_BACK;
969 return alloc_conn(rqstp, dir);
972 /* must be called under client_lock */
973 static void nfsd4_del_conns(struct nfsd4_session *s)
975 struct nfs4_client *clp = s->se_client;
976 struct nfsd4_conn *c;
978 spin_lock(&clp->cl_lock);
979 while (!list_empty(&s->se_conns)) {
980 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
981 list_del_init(&c->cn_persession);
982 spin_unlock(&clp->cl_lock);
984 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
987 spin_lock(&clp->cl_lock);
989 spin_unlock(&clp->cl_lock);
992 static void __free_session(struct nfsd4_session *ses)
994 free_session_slots(ses);
998 static void free_session(struct nfsd4_session *ses)
1000 struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
1002 lockdep_assert_held(&nn->client_lock);
1003 nfsd4_del_conns(ses);
1004 nfsd4_put_drc_mem(&ses->se_fchannel);
1005 __free_session(ses);
1008 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1011 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1013 new->se_client = clp;
1016 INIT_LIST_HEAD(&new->se_conns);
1018 new->se_cb_seq_nr = 1;
1019 new->se_flags = cses->flags;
1020 new->se_cb_prog = cses->callback_prog;
1021 new->se_cb_sec = cses->cb_sec;
1022 atomic_set(&new->se_ref, 0);
1023 idx = hash_sessionid(&new->se_sessionid);
1024 spin_lock(&nn->client_lock);
1025 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1026 spin_lock(&clp->cl_lock);
1027 list_add(&new->se_perclnt, &clp->cl_sessions);
1028 spin_unlock(&clp->cl_lock);
1029 spin_unlock(&nn->client_lock);
1031 if (cses->flags & SESSION4_BACK_CHAN) {
1032 struct sockaddr *sa = svc_addr(rqstp);
1034 * This is a little silly; with sessions there's no real
1035 * use for the callback address. Use the peer address
1036 * as a reasonable default for now, but consider fixing
1037 * the rpc client not to require an address in the
1040 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1041 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1045 /* caller must hold client_lock */
1046 static struct nfsd4_session *
1047 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1049 struct nfsd4_session *elem;
1051 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1053 dump_sessionid(__func__, sessionid);
1054 idx = hash_sessionid(sessionid);
1055 /* Search in the appropriate list */
1056 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1057 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1058 NFS4_MAX_SESSIONID_LEN)) {
1063 dprintk("%s: session not found\n", __func__);
1067 /* caller must hold client_lock */
1069 unhash_session(struct nfsd4_session *ses)
1071 list_del(&ses->se_hash);
1072 spin_lock(&ses->se_client->cl_lock);
1073 list_del(&ses->se_perclnt);
1074 spin_unlock(&ses->se_client->cl_lock);
1077 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1079 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1081 if (clid->cl_boot == nn->boot_time)
1083 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1084 clid->cl_boot, clid->cl_id, nn->boot_time);
1089 * XXX Should we use a slab cache ?
1090 * This type of memory management is somewhat inefficient, but we use it
1091 * anyway since SETCLIENTID is not a common operation.
1093 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1095 struct nfs4_client *clp;
1097 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1100 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1101 if (clp->cl_name.data == NULL) {
1105 clp->cl_name.len = name.len;
1106 INIT_LIST_HEAD(&clp->cl_sessions);
1107 idr_init(&clp->cl_stateids);
1108 atomic_set(&clp->cl_refcount, 0);
1109 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1110 INIT_LIST_HEAD(&clp->cl_idhash);
1111 INIT_LIST_HEAD(&clp->cl_openowners);
1112 INIT_LIST_HEAD(&clp->cl_delegations);
1113 INIT_LIST_HEAD(&clp->cl_lru);
1114 INIT_LIST_HEAD(&clp->cl_callbacks);
1115 INIT_LIST_HEAD(&clp->cl_revoked);
1116 spin_lock_init(&clp->cl_lock);
1117 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1122 free_client(struct nfs4_client *clp)
1124 struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1126 lockdep_assert_held(&nn->client_lock);
1127 while (!list_empty(&clp->cl_sessions)) {
1128 struct nfsd4_session *ses;
1129 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1131 list_del(&ses->se_perclnt);
1132 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1135 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1136 free_svc_cred(&clp->cl_cred);
1137 kfree(clp->cl_name.data);
1138 idr_destroy(&clp->cl_stateids);
1142 /* must be called under the client_lock */
1144 unhash_client_locked(struct nfs4_client *clp)
1146 struct nfsd4_session *ses;
1148 list_del(&clp->cl_lru);
1149 spin_lock(&clp->cl_lock);
1150 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1151 list_del_init(&ses->se_hash);
1152 spin_unlock(&clp->cl_lock);
1156 destroy_client(struct nfs4_client *clp)
1158 struct nfs4_openowner *oo;
1159 struct nfs4_delegation *dp;
1160 struct list_head reaplist;
1161 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1163 INIT_LIST_HEAD(&reaplist);
1164 spin_lock(&state_lock);
1165 while (!list_empty(&clp->cl_delegations)) {
1166 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1167 list_del_init(&dp->dl_perclnt);
1168 list_move(&dp->dl_recall_lru, &reaplist);
1170 spin_unlock(&state_lock);
1171 while (!list_empty(&reaplist)) {
1172 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1173 destroy_delegation(dp);
1175 list_splice_init(&clp->cl_revoked, &reaplist);
1176 while (!list_empty(&reaplist)) {
1177 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1178 destroy_revoked_delegation(dp);
1180 while (!list_empty(&clp->cl_openowners)) {
1181 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1182 release_openowner(oo);
1184 nfsd4_shutdown_callback(clp);
1185 if (clp->cl_cb_conn.cb_xprt)
1186 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1187 list_del(&clp->cl_idhash);
1188 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1189 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1191 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1192 spin_lock(&nn->client_lock);
1193 unhash_client_locked(clp);
1194 WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1196 spin_unlock(&nn->client_lock);
1199 static void expire_client(struct nfs4_client *clp)
1201 nfsd4_client_record_remove(clp);
1202 destroy_client(clp);
1205 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1207 memcpy(target->cl_verifier.data, source->data,
1208 sizeof(target->cl_verifier.data));
1211 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1213 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1214 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1217 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1219 if (source->cr_principal) {
1220 target->cr_principal =
1221 kstrdup(source->cr_principal, GFP_KERNEL);
1222 if (target->cr_principal == NULL)
1225 target->cr_principal = NULL;
1226 target->cr_flavor = source->cr_flavor;
1227 target->cr_uid = source->cr_uid;
1228 target->cr_gid = source->cr_gid;
1229 target->cr_group_info = source->cr_group_info;
1230 get_group_info(target->cr_group_info);
1231 target->cr_gss_mech = source->cr_gss_mech;
1232 if (source->cr_gss_mech)
1233 gss_mech_get(source->cr_gss_mech);
1238 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1242 res = o1->len - o2->len;
1245 return (long long)memcmp(o1->data, o2->data, o1->len);
1248 static int same_name(const char *n1, const char *n2)
1250 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1254 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1256 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1260 same_clid(clientid_t *cl1, clientid_t *cl2)
1262 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1265 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1269 if (g1->ngroups != g2->ngroups)
1271 for (i=0; i<g1->ngroups; i++)
1272 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1278 * RFC 3530 language requires clid_inuse be returned when the
1279 * "principal" associated with a requests differs from that previously
1280 * used. We use uid, gid's, and gss principal string as our best
1281 * approximation. We also don't want to allow non-gss use of a client
1282 * established using gss: in theory cr_principal should catch that
1283 * change, but in practice cr_principal can be null even in the gss case
1284 * since gssd doesn't always pass down a principal string.
1286 static bool is_gss_cred(struct svc_cred *cr)
1288 /* Is cr_flavor one of the gss "pseudoflavors"?: */
1289 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1294 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1296 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1297 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1298 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1299 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1301 if (cr1->cr_principal == cr2->cr_principal)
1303 if (!cr1->cr_principal || !cr2->cr_principal)
1305 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1308 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1310 struct svc_cred *cr = &rqstp->rq_cred;
1313 if (!cr->cr_gss_mech)
1315 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1316 return service == RPC_GSS_SVC_INTEGRITY ||
1317 service == RPC_GSS_SVC_PRIVACY;
1320 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1322 struct svc_cred *cr = &rqstp->rq_cred;
1324 if (!cl->cl_mach_cred)
1326 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1328 if (!svc_rqst_integrity_protected(rqstp))
1330 if (!cr->cr_principal)
1332 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1335 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1337 static u32 current_clientid = 1;
1339 clp->cl_clientid.cl_boot = nn->boot_time;
1340 clp->cl_clientid.cl_id = current_clientid++;
1343 static void gen_confirm(struct nfs4_client *clp)
1348 verf[0] = (__be32)get_seconds();
1349 verf[1] = (__be32)i++;
1350 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1353 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1355 struct nfs4_stid *ret;
1357 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1358 if (!ret || !ret->sc_type)
1363 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1365 struct nfs4_stid *s;
1367 s = find_stateid(cl, t);
1370 if (typemask & s->sc_type)
1375 static struct nfs4_client *create_client(struct xdr_netobj name,
1376 struct svc_rqst *rqstp, nfs4_verifier *verf)
1378 struct nfs4_client *clp;
1379 struct sockaddr *sa = svc_addr(rqstp);
1381 struct net *net = SVC_NET(rqstp);
1382 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1384 clp = alloc_client(name);
1388 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1390 spin_lock(&nn->client_lock);
1392 spin_unlock(&nn->client_lock);
1395 nfsd4_init_callback(&clp->cl_cb_null);
1396 clp->cl_time = get_seconds();
1397 clear_bit(0, &clp->cl_cb_slot_busy);
1398 copy_verf(clp, verf);
1399 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1401 clp->cl_cb_session = NULL;
1407 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1409 struct rb_node **new = &(root->rb_node), *parent = NULL;
1410 struct nfs4_client *clp;
1413 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1416 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1417 new = &((*new)->rb_left);
1419 new = &((*new)->rb_right);
1422 rb_link_node(&new_clp->cl_namenode, parent, new);
1423 rb_insert_color(&new_clp->cl_namenode, root);
1426 static struct nfs4_client *
1427 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1430 struct rb_node *node = root->rb_node;
1431 struct nfs4_client *clp;
1434 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1435 cmp = compare_blob(&clp->cl_name, name);
1437 node = node->rb_left;
1439 node = node->rb_right;
1447 add_to_unconfirmed(struct nfs4_client *clp)
1449 unsigned int idhashval;
1450 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1452 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1453 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1454 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1455 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1460 move_to_confirmed(struct nfs4_client *clp)
1462 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1463 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1465 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1466 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1467 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1468 add_clp_to_name_tree(clp, &nn->conf_name_tree);
1469 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1473 static struct nfs4_client *
1474 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1476 struct nfs4_client *clp;
1477 unsigned int idhashval = clientid_hashval(clid->cl_id);
1479 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1480 if (same_clid(&clp->cl_clientid, clid)) {
1481 if ((bool)clp->cl_minorversion != sessions)
1490 static struct nfs4_client *
1491 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1493 struct list_head *tbl = nn->conf_id_hashtbl;
1495 return find_client_in_id_table(tbl, clid, sessions);
1498 static struct nfs4_client *
1499 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1501 struct list_head *tbl = nn->unconf_id_hashtbl;
1503 return find_client_in_id_table(tbl, clid, sessions);
1506 static bool clp_used_exchangeid(struct nfs4_client *clp)
1508 return clp->cl_exchange_flags != 0;
1511 static struct nfs4_client *
1512 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1514 return find_clp_in_name_tree(name, &nn->conf_name_tree);
1517 static struct nfs4_client *
1518 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1520 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1524 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1526 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1527 struct sockaddr *sa = svc_addr(rqstp);
1528 u32 scopeid = rpc_get_scope_id(sa);
1529 unsigned short expected_family;
1531 /* Currently, we only support tcp and tcp6 for the callback channel */
1532 if (se->se_callback_netid_len == 3 &&
1533 !memcmp(se->se_callback_netid_val, "tcp", 3))
1534 expected_family = AF_INET;
1535 else if (se->se_callback_netid_len == 4 &&
1536 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1537 expected_family = AF_INET6;
1541 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1542 se->se_callback_addr_len,
1543 (struct sockaddr *)&conn->cb_addr,
1544 sizeof(conn->cb_addr));
1546 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1549 if (conn->cb_addr.ss_family == AF_INET6)
1550 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1552 conn->cb_prog = se->se_callback_prog;
1553 conn->cb_ident = se->se_callback_ident;
1554 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1557 conn->cb_addr.ss_family = AF_UNSPEC;
1558 conn->cb_addrlen = 0;
1559 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1560 "will not receive delegations\n",
1561 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1567 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1570 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1572 struct xdr_buf *buf = resp->xdr.buf;
1573 struct nfsd4_slot *slot = resp->cstate.slot;
1576 dprintk("--> %s slot %p\n", __func__, slot);
1578 slot->sl_opcnt = resp->opcnt;
1579 slot->sl_status = resp->cstate.status;
1581 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1582 if (nfsd4_not_cached(resp)) {
1583 slot->sl_datalen = 0;
1586 base = resp->cstate.data_offset;
1587 slot->sl_datalen = buf->len - base;
1588 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
1589 WARN("%s: sessions DRC could not cache compound\n", __func__);
1594 * Encode the replay sequence operation from the slot values.
1595 * If cachethis is FALSE encode the uncached rep error on the next
1596 * operation which sets resp->p and increments resp->opcnt for
1597 * nfs4svc_encode_compoundres.
1601 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1602 struct nfsd4_compoundres *resp)
1604 struct nfsd4_op *op;
1605 struct nfsd4_slot *slot = resp->cstate.slot;
1607 /* Encode the replayed sequence operation */
1608 op = &args->ops[resp->opcnt - 1];
1609 nfsd4_encode_operation(resp, op);
1611 /* Return nfserr_retry_uncached_rep in next operation. */
1612 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1613 op = &args->ops[resp->opcnt++];
1614 op->status = nfserr_retry_uncached_rep;
1615 nfsd4_encode_operation(resp, op);
1621 * The sequence operation is not cached because we can use the slot and
1625 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1626 struct nfsd4_sequence *seq)
1628 struct nfsd4_slot *slot = resp->cstate.slot;
1629 struct xdr_stream *xdr = &resp->xdr;
1633 dprintk("--> %s slot %p\n", __func__, slot);
1635 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1639 p = xdr_reserve_space(xdr, slot->sl_datalen);
1642 return nfserr_serverfault;
1644 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
1645 xdr_commit_encode(xdr);
1647 resp->opcnt = slot->sl_opcnt;
1648 return slot->sl_status;
1652 * Set the exchange_id flags returned by the server.
1655 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1657 /* pNFS is not supported */
1658 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1660 /* Referrals are supported, Migration is not. */
1661 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1663 /* set the wire flags to return to client. */
1664 clid->flags = new->cl_exchange_flags;
1667 static bool client_has_state(struct nfs4_client *clp)
1670 * Note clp->cl_openowners check isn't quite right: there's no
1671 * need to count owners without stateid's.
1673 * Also note we should probably be using this in 4.0 case too.
1675 return !list_empty(&clp->cl_openowners)
1676 || !list_empty(&clp->cl_delegations)
1677 || !list_empty(&clp->cl_sessions);
1681 nfsd4_exchange_id(struct svc_rqst *rqstp,
1682 struct nfsd4_compound_state *cstate,
1683 struct nfsd4_exchange_id *exid)
1685 struct nfs4_client *unconf, *conf, *new;
1687 char addr_str[INET6_ADDRSTRLEN];
1688 nfs4_verifier verf = exid->verifier;
1689 struct sockaddr *sa = svc_addr(rqstp);
1690 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1691 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1693 rpc_ntop(sa, addr_str, sizeof(addr_str));
1694 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1695 "ip_addr=%s flags %x, spa_how %d\n",
1696 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1697 addr_str, exid->flags, exid->spa_how);
1699 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1700 return nfserr_inval;
1702 switch (exid->spa_how) {
1704 if (!svc_rqst_integrity_protected(rqstp))
1705 return nfserr_inval;
1708 default: /* checked by xdr code */
1711 return nfserr_encr_alg_unsupp;
1714 /* Cases below refer to rfc 5661 section 18.35.4: */
1716 conf = find_confirmed_client_by_name(&exid->clname, nn);
1718 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1719 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1722 if (!clp_used_exchangeid(conf)) { /* buggy client */
1723 status = nfserr_inval;
1726 if (!mach_creds_match(conf, rqstp)) {
1727 status = nfserr_wrong_cred;
1730 if (!creds_match) { /* case 9 */
1731 status = nfserr_perm;
1734 if (!verfs_match) { /* case 8 */
1735 status = nfserr_not_same;
1739 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1743 if (!creds_match) { /* case 3 */
1744 if (client_has_state(conf)) {
1745 status = nfserr_clid_inuse;
1748 expire_client(conf);
1751 if (verfs_match) { /* case 2 */
1752 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1756 /* case 5, client reboot */
1760 if (update) { /* case 7 */
1761 status = nfserr_noent;
1765 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
1766 if (unconf) /* case 4, possible retry or client restart */
1767 expire_client(unconf);
1769 /* case 1 (normal case) */
1771 new = create_client(exid->clname, rqstp, &verf);
1773 status = nfserr_jukebox;
1776 new->cl_minorversion = cstate->minorversion;
1777 new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1780 add_to_unconfirmed(new);
1782 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1783 exid->clientid.cl_id = new->cl_clientid.cl_id;
1785 exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1786 nfsd4_set_ex_flags(new, exid);
1788 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1789 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1793 nfs4_unlock_state();
1798 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1800 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1803 /* The slot is in use, and no response has been sent. */
1805 if (seqid == slot_seqid)
1806 return nfserr_jukebox;
1808 return nfserr_seq_misordered;
1810 /* Note unsigned 32-bit arithmetic handles wraparound: */
1811 if (likely(seqid == slot_seqid + 1))
1813 if (seqid == slot_seqid)
1814 return nfserr_replay_cache;
1815 return nfserr_seq_misordered;
1819 * Cache the create session result into the create session single DRC
1820 * slot cache by saving the xdr structure. sl_seqid has been set.
1821 * Do this for solo or embedded create session operations.
1824 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1825 struct nfsd4_clid_slot *slot, __be32 nfserr)
1827 slot->sl_status = nfserr;
1828 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1832 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1833 struct nfsd4_clid_slot *slot)
1835 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1836 return slot->sl_status;
1839 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1840 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1841 1 + /* MIN tag is length with zero, only length */ \
1842 3 + /* version, opcount, opcode */ \
1843 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1844 /* seqid, slotID, slotID, cache */ \
1845 4 ) * sizeof(__be32))
1847 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1848 2 + /* verifier: AUTH_NULL, length 0 */\
1850 1 + /* MIN tag is length with zero, only length */ \
1851 3 + /* opcount, opcode, opstatus*/ \
1852 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1853 /* seqid, slotID, slotID, slotID, status */ \
1854 5 ) * sizeof(__be32))
1856 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1858 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1860 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1861 return nfserr_toosmall;
1862 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1863 return nfserr_toosmall;
1864 ca->headerpadsz = 0;
1865 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1866 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1867 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1868 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1869 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1870 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1872 * Note decreasing slot size below client's request may make it
1873 * difficult for client to function correctly, whereas
1874 * decreasing the number of slots will (just?) affect
1875 * performance. When short on memory we therefore prefer to
1876 * decrease number of slots instead of their size. Clients that
1877 * request larger slots than they need will get poor results:
1879 ca->maxreqs = nfsd4_get_drc_mem(ca);
1881 return nfserr_jukebox;
1886 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
1887 RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1888 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
1889 RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
1891 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1893 ca->headerpadsz = 0;
1896 * These RPC_MAX_HEADER macros are overkill, especially since we
1897 * don't even do gss on the backchannel yet. But this is still
1898 * less than 1k. Tighten up this estimate in the unlikely event
1899 * it turns out to be a problem for some client:
1901 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1902 return nfserr_toosmall;
1903 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1904 return nfserr_toosmall;
1905 ca->maxresp_cached = 0;
1907 return nfserr_toosmall;
1912 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1914 switch (cbs->flavor) {
1920 * GSS case: the spec doesn't allow us to return this
1921 * error. But it also doesn't allow us not to support
1923 * I'd rather this fail hard than return some error the
1924 * client might think it can already handle:
1926 return nfserr_encr_alg_unsupp;
1931 nfsd4_create_session(struct svc_rqst *rqstp,
1932 struct nfsd4_compound_state *cstate,
1933 struct nfsd4_create_session *cr_ses)
1935 struct sockaddr *sa = svc_addr(rqstp);
1936 struct nfs4_client *conf, *unconf;
1937 struct nfsd4_session *new;
1938 struct nfsd4_conn *conn;
1939 struct nfsd4_clid_slot *cs_slot = NULL;
1941 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1943 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1944 return nfserr_inval;
1945 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1948 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1951 status = check_backchannel_attrs(&cr_ses->back_channel);
1953 goto out_release_drc_mem;
1954 status = nfserr_jukebox;
1955 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
1957 goto out_release_drc_mem;
1958 conn = alloc_conn_from_crses(rqstp, cr_ses);
1960 goto out_free_session;
1963 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1964 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1965 WARN_ON_ONCE(conf && unconf);
1968 status = nfserr_wrong_cred;
1969 if (!mach_creds_match(conf, rqstp))
1971 cs_slot = &conf->cl_cs_slot;
1972 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1973 if (status == nfserr_replay_cache) {
1974 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1976 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1977 status = nfserr_seq_misordered;
1980 } else if (unconf) {
1981 struct nfs4_client *old;
1982 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1983 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1984 status = nfserr_clid_inuse;
1987 status = nfserr_wrong_cred;
1988 if (!mach_creds_match(unconf, rqstp))
1990 cs_slot = &unconf->cl_cs_slot;
1991 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1993 /* an unconfirmed replay returns misordered */
1994 status = nfserr_seq_misordered;
1997 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1999 status = mark_client_expired(old);
2004 move_to_confirmed(unconf);
2007 status = nfserr_stale_clientid;
2012 * We do not support RDMA or persistent sessions
2014 cr_ses->flags &= ~SESSION4_PERSIST;
2015 cr_ses->flags &= ~SESSION4_RDMA;
2017 init_session(rqstp, new, conf, cr_ses);
2018 nfsd4_init_conn(rqstp, conn, new);
2020 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2021 NFS4_MAX_SESSIONID_LEN);
2022 cs_slot->sl_seqid++;
2023 cr_ses->seqid = cs_slot->sl_seqid;
2025 /* cache solo and embedded create sessions under the state lock */
2026 nfsd4_cache_create_session(cr_ses, cs_slot, status);
2027 nfs4_unlock_state();
2030 nfs4_unlock_state();
2033 __free_session(new);
2034 out_release_drc_mem:
2035 nfsd4_put_drc_mem(&cr_ses->fore_channel);
2039 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2042 case NFS4_CDFC4_FORE:
2043 case NFS4_CDFC4_BACK:
2045 case NFS4_CDFC4_FORE_OR_BOTH:
2046 case NFS4_CDFC4_BACK_OR_BOTH:
2047 *dir = NFS4_CDFC4_BOTH;
2050 return nfserr_inval;
2053 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2055 struct nfsd4_session *session = cstate->session;
2056 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2059 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2062 spin_lock(&nn->client_lock);
2063 session->se_cb_prog = bc->bc_cb_program;
2064 session->se_cb_sec = bc->bc_cb_sec;
2065 spin_unlock(&nn->client_lock);
2067 nfsd4_probe_callback(session->se_client);
2072 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2073 struct nfsd4_compound_state *cstate,
2074 struct nfsd4_bind_conn_to_session *bcts)
2077 struct nfsd4_conn *conn;
2078 struct nfsd4_session *session;
2079 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2081 if (!nfsd4_last_compound_op(rqstp))
2082 return nfserr_not_only_op;
2084 spin_lock(&nn->client_lock);
2085 session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2086 spin_unlock(&nn->client_lock);
2087 status = nfserr_badsession;
2090 status = nfserr_wrong_cred;
2091 if (!mach_creds_match(session->se_client, rqstp))
2093 status = nfsd4_map_bcts_dir(&bcts->dir);
2096 conn = alloc_conn(rqstp, bcts->dir);
2097 status = nfserr_jukebox;
2100 nfsd4_init_conn(rqstp, conn, session);
2103 nfs4_unlock_state();
2107 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2111 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2115 nfsd4_destroy_session(struct svc_rqst *r,
2116 struct nfsd4_compound_state *cstate,
2117 struct nfsd4_destroy_session *sessionid)
2119 struct nfsd4_session *ses;
2121 int ref_held_by_me = 0;
2122 struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2125 status = nfserr_not_only_op;
2126 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2127 if (!nfsd4_last_compound_op(r))
2131 dump_sessionid(__func__, &sessionid->sessionid);
2132 spin_lock(&nn->client_lock);
2133 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2134 status = nfserr_badsession;
2136 goto out_client_lock;
2137 status = nfserr_wrong_cred;
2138 if (!mach_creds_match(ses->se_client, r))
2139 goto out_client_lock;
2140 nfsd4_get_session_locked(ses);
2141 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2143 goto out_put_session;
2144 unhash_session(ses);
2145 spin_unlock(&nn->client_lock);
2147 nfsd4_probe_callback_sync(ses->se_client);
2149 spin_lock(&nn->client_lock);
2152 nfsd4_put_session(ses);
2154 spin_unlock(&nn->client_lock);
2156 nfs4_unlock_state();
2160 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2162 struct nfsd4_conn *c;
2164 list_for_each_entry(c, &s->se_conns, cn_persession) {
2165 if (c->cn_xprt == xpt) {
2172 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2174 struct nfs4_client *clp = ses->se_client;
2175 struct nfsd4_conn *c;
2176 __be32 status = nfs_ok;
2179 spin_lock(&clp->cl_lock);
2180 c = __nfsd4_find_conn(new->cn_xprt, ses);
2183 status = nfserr_conn_not_bound_to_session;
2184 if (clp->cl_mach_cred)
2186 __nfsd4_hash_conn(new, ses);
2187 spin_unlock(&clp->cl_lock);
2188 ret = nfsd4_register_conn(new);
2190 /* oops; xprt is already down: */
2191 nfsd4_conn_lost(&new->cn_xpt_user);
2194 spin_unlock(&clp->cl_lock);
2199 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2201 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2203 return args->opcnt > session->se_fchannel.maxops;
2206 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2207 struct nfsd4_session *session)
2209 struct xdr_buf *xb = &rqstp->rq_arg;
2211 return xb->len > session->se_fchannel.maxreq_sz;
2215 nfsd4_sequence(struct svc_rqst *rqstp,
2216 struct nfsd4_compound_state *cstate,
2217 struct nfsd4_sequence *seq)
2219 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2220 struct xdr_stream *xdr = &resp->xdr;
2221 struct nfsd4_session *session;
2222 struct nfs4_client *clp;
2223 struct nfsd4_slot *slot;
2224 struct nfsd4_conn *conn;
2227 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2229 if (resp->opcnt != 1)
2230 return nfserr_sequence_pos;
2233 * Will be either used or freed by nfsd4_sequence_check_conn
2236 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2238 return nfserr_jukebox;
2240 spin_lock(&nn->client_lock);
2241 status = nfserr_badsession;
2242 session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2244 goto out_no_session;
2245 clp = session->se_client;
2246 status = get_client_locked(clp);
2248 goto out_no_session;
2249 status = nfsd4_get_session_locked(session);
2251 goto out_put_client;
2253 status = nfserr_too_many_ops;
2254 if (nfsd4_session_too_many_ops(rqstp, session))
2255 goto out_put_session;
2257 status = nfserr_req_too_big;
2258 if (nfsd4_request_too_big(rqstp, session))
2259 goto out_put_session;
2261 status = nfserr_badslot;
2262 if (seq->slotid >= session->se_fchannel.maxreqs)
2263 goto out_put_session;
2265 slot = session->se_slots[seq->slotid];
2266 dprintk("%s: slotid %d\n", __func__, seq->slotid);
2268 /* We do not negotiate the number of slots yet, so set the
2269 * maxslots to the session maxreqs which is used to encode
2270 * sr_highest_slotid and the sr_target_slot id to maxslots */
2271 seq->maxslots = session->se_fchannel.maxreqs;
2273 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2274 slot->sl_flags & NFSD4_SLOT_INUSE);
2275 if (status == nfserr_replay_cache) {
2276 status = nfserr_seq_misordered;
2277 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2278 goto out_put_session;
2279 cstate->slot = slot;
2280 cstate->session = session;
2281 /* Return the cached reply status and set cstate->status
2282 * for nfsd4_proc_compound processing */
2283 status = nfsd4_replay_cache_entry(resp, seq);
2284 cstate->status = nfserr_replay_cache;
2288 goto out_put_session;
2290 status = nfsd4_sequence_check_conn(conn, session);
2293 goto out_put_session;
2295 buflen = (seq->cachethis) ?
2296 session->se_fchannel.maxresp_cached :
2297 session->se_fchannel.maxresp_sz;
2298 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
2300 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
2301 goto out_put_session;
2302 svc_reserve(rqstp, buflen);
2305 /* Success! bump slot seqid */
2306 slot->sl_seqid = seq->seqid;
2307 slot->sl_flags |= NFSD4_SLOT_INUSE;
2309 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2311 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2313 cstate->slot = slot;
2314 cstate->session = session;
2317 switch (clp->cl_cb_state) {
2319 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2321 case NFSD4_CB_FAULT:
2322 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2325 seq->status_flags = 0;
2327 if (!list_empty(&clp->cl_revoked))
2328 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2332 spin_unlock(&nn->client_lock);
2335 nfsd4_put_session(session);
2337 put_client_renew_locked(clp);
2338 goto out_no_session;
2342 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2344 struct nfs4_client *conf, *unconf, *clp;
2346 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2349 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2350 conf = find_confirmed_client(&dc->clientid, true, nn);
2351 WARN_ON_ONCE(conf && unconf);
2356 if (client_has_state(conf)) {
2357 status = nfserr_clientid_busy;
2363 status = nfserr_stale_clientid;
2366 if (!mach_creds_match(clp, rqstp)) {
2367 status = nfserr_wrong_cred;
2372 nfs4_unlock_state();
2377 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2381 if (rc->rca_one_fs) {
2382 if (!cstate->current_fh.fh_dentry)
2383 return nfserr_nofilehandle;
2385 * We don't take advantage of the rca_one_fs case.
2386 * That's OK, it's optional, we can safely ignore it.
2392 status = nfserr_complete_already;
2393 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2394 &cstate->session->se_client->cl_flags))
2397 status = nfserr_stale_clientid;
2398 if (is_client_expired(cstate->session->se_client))
2400 * The following error isn't really legal.
2401 * But we only get here if the client just explicitly
2402 * destroyed the client. Surely it no longer cares what
2403 * error it gets back on an operation for the dead
2409 nfsd4_client_record_create(cstate->session->se_client);
2411 nfs4_unlock_state();
2416 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2417 struct nfsd4_setclientid *setclid)
2419 struct xdr_netobj clname = setclid->se_name;
2420 nfs4_verifier clverifier = setclid->se_verf;
2421 struct nfs4_client *conf, *unconf, *new;
2423 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2425 /* Cases below refer to rfc 3530 section 14.2.33: */
2427 conf = find_confirmed_client_by_name(&clname, nn);
2430 status = nfserr_clid_inuse;
2431 if (clp_used_exchangeid(conf))
2433 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2434 char addr_str[INET6_ADDRSTRLEN];
2435 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2437 dprintk("NFSD: setclientid: string in use by client "
2438 "at %s\n", addr_str);
2442 unconf = find_unconfirmed_client_by_name(&clname, nn);
2444 expire_client(unconf);
2445 status = nfserr_jukebox;
2446 new = create_client(clname, rqstp, &clverifier);
2449 if (conf && same_verf(&conf->cl_verifier, &clverifier))
2450 /* case 1: probable callback update */
2451 copy_clid(new, conf);
2452 else /* case 4 (new client) or cases 2, 3 (client reboot): */
2454 new->cl_minorversion = 0;
2455 gen_callback(new, setclid, rqstp);
2456 add_to_unconfirmed(new);
2457 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2458 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2459 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2462 nfs4_unlock_state();
2468 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2469 struct nfsd4_compound_state *cstate,
2470 struct nfsd4_setclientid_confirm *setclientid_confirm)
2472 struct nfs4_client *conf, *unconf;
2473 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2474 clientid_t * clid = &setclientid_confirm->sc_clientid;
2476 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2478 if (STALE_CLIENTID(clid, nn))
2479 return nfserr_stale_clientid;
2482 conf = find_confirmed_client(clid, false, nn);
2483 unconf = find_unconfirmed_client(clid, false, nn);
2485 * We try hard to give out unique clientid's, so if we get an
2486 * attempt to confirm the same clientid with a different cred,
2487 * there's a bug somewhere. Let's charitably assume it's our
2490 status = nfserr_serverfault;
2491 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2493 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2495 /* cases below refer to rfc 3530 section 14.2.34: */
2496 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2497 if (conf && !unconf) /* case 2: probable retransmit */
2499 else /* case 4: client hasn't noticed we rebooted yet? */
2500 status = nfserr_stale_clientid;
2504 if (conf) { /* case 1: callback update */
2505 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2506 nfsd4_probe_callback(conf);
2507 expire_client(unconf);
2508 } else { /* case 3: normal case; new or rebooted client */
2509 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2511 status = mark_client_expired(conf);
2514 expire_client(conf);
2516 move_to_confirmed(unconf);
2517 nfsd4_probe_callback(unconf);
2520 nfs4_unlock_state();
2524 static struct nfs4_file *nfsd4_alloc_file(void)
2526 return kmem_cache_alloc(file_slab, GFP_KERNEL);
2529 /* OPEN Share state helper functions */
2530 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2532 unsigned int hashval = file_hashval(ino);
2534 atomic_set(&fp->fi_ref, 1);
2535 INIT_LIST_HEAD(&fp->fi_stateids);
2536 INIT_LIST_HEAD(&fp->fi_delegations);
2537 fp->fi_inode = igrab(ino);
2538 fp->fi_had_conflict = false;
2539 fp->fi_lease = NULL;
2540 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2541 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2542 spin_lock(&state_lock);
2543 hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2544 spin_unlock(&state_lock);
2548 nfsd4_free_slabs(void)
2550 kmem_cache_destroy(openowner_slab);
2551 kmem_cache_destroy(lockowner_slab);
2552 kmem_cache_destroy(file_slab);
2553 kmem_cache_destroy(stateid_slab);
2554 kmem_cache_destroy(deleg_slab);
2558 nfsd4_init_slabs(void)
2560 openowner_slab = kmem_cache_create("nfsd4_openowners",
2561 sizeof(struct nfs4_openowner), 0, 0, NULL);
2562 if (openowner_slab == NULL)
2564 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2565 sizeof(struct nfs4_lockowner), 0, 0, NULL);
2566 if (lockowner_slab == NULL)
2567 goto out_free_openowner_slab;
2568 file_slab = kmem_cache_create("nfsd4_files",
2569 sizeof(struct nfs4_file), 0, 0, NULL);
2570 if (file_slab == NULL)
2571 goto out_free_lockowner_slab;
2572 stateid_slab = kmem_cache_create("nfsd4_stateids",
2573 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2574 if (stateid_slab == NULL)
2575 goto out_free_file_slab;
2576 deleg_slab = kmem_cache_create("nfsd4_delegations",
2577 sizeof(struct nfs4_delegation), 0, 0, NULL);
2578 if (deleg_slab == NULL)
2579 goto out_free_stateid_slab;
2582 out_free_stateid_slab:
2583 kmem_cache_destroy(stateid_slab);
2585 kmem_cache_destroy(file_slab);
2586 out_free_lockowner_slab:
2587 kmem_cache_destroy(lockowner_slab);
2588 out_free_openowner_slab:
2589 kmem_cache_destroy(openowner_slab);
2591 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2595 static void init_nfs4_replay(struct nfs4_replay *rp)
2597 rp->rp_status = nfserr_serverfault;
2599 rp->rp_buf = rp->rp_ibuf;
2602 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2604 struct nfs4_stateowner *sop;
2606 sop = kmem_cache_alloc(slab, GFP_KERNEL);
2610 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2611 if (!sop->so_owner.data) {
2612 kmem_cache_free(slab, sop);
2615 sop->so_owner.len = owner->len;
2617 INIT_LIST_HEAD(&sop->so_stateids);
2618 sop->so_client = clp;
2619 init_nfs4_replay(&sop->so_replay);
2623 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2625 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2627 list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2628 list_add(&oo->oo_perclient, &clp->cl_openowners);
2631 static struct nfs4_openowner *
2632 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2633 struct nfs4_openowner *oo;
2635 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2638 oo->oo_owner.so_is_open_owner = 1;
2639 oo->oo_owner.so_seqid = open->op_seqid;
2640 oo->oo_flags = NFS4_OO_NEW;
2642 oo->oo_last_closed_stid = NULL;
2643 INIT_LIST_HEAD(&oo->oo_close_lru);
2644 hash_openowner(oo, clp, strhashval);
2648 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2649 struct nfs4_openowner *oo = open->op_openowner;
2651 stp->st_stid.sc_type = NFS4_OPEN_STID;
2652 INIT_LIST_HEAD(&stp->st_lockowners);
2653 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2654 list_add(&stp->st_perfile, &fp->fi_stateids);
2655 stp->st_stateowner = &oo->oo_owner;
2658 stp->st_access_bmap = 0;
2659 stp->st_deny_bmap = 0;
2660 set_access(open->op_share_access, stp);
2661 set_deny(open->op_share_deny, stp);
2662 stp->st_openstp = NULL;
2666 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2668 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2670 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2672 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2673 oo->oo_time = get_seconds();
2677 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2680 return (sop->so_owner.len == owner->len) &&
2681 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2682 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2685 static struct nfs4_openowner *
2686 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2687 bool sessions, struct nfsd_net *nn)
2689 struct nfs4_stateowner *so;
2690 struct nfs4_openowner *oo;
2691 struct nfs4_client *clp;
2693 list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2694 if (!so->so_is_open_owner)
2696 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2698 clp = oo->oo_owner.so_client;
2699 if ((bool)clp->cl_minorversion != sessions)
2701 renew_client(oo->oo_owner.so_client);
2708 /* search file_hashtbl[] for file */
2709 static struct nfs4_file *
2710 find_file(struct inode *ino)
2712 unsigned int hashval = file_hashval(ino);
2713 struct nfs4_file *fp;
2715 spin_lock(&state_lock);
2716 hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2717 if (fp->fi_inode == ino) {
2719 spin_unlock(&state_lock);
2723 spin_unlock(&state_lock);
2728 * Called to check deny when READ with all zero stateid or
2729 * WRITE with all zero or all one stateid
2732 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2734 struct inode *ino = current_fh->fh_dentry->d_inode;
2735 struct nfs4_file *fp;
2736 struct nfs4_ol_stateid *stp;
2739 fp = find_file(ino);
2742 ret = nfserr_locked;
2743 /* Search for conflicting share reservations */
2744 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2745 if (test_deny(deny_type, stp) ||
2746 test_deny(NFS4_SHARE_DENY_BOTH, stp))
2755 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2757 struct nfs4_client *clp = dp->dl_stid.sc_client;
2758 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2760 lockdep_assert_held(&state_lock);
2761 /* We're assuming the state code never drops its reference
2762 * without first removing the lease. Since we're in this lease
2763 * callback (and since the lease code is serialized by the kernel
2764 * lock) we know the server hasn't removed the lease yet, we know
2765 * it's safe to take a reference: */
2766 atomic_inc(&dp->dl_count);
2768 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2770 /* Only place dl_time is set; protected by i_lock: */
2771 dp->dl_time = get_seconds();
2773 nfsd4_cb_recall(dp);
2776 /* Called from break_lease() with i_lock held. */
2777 static void nfsd_break_deleg_cb(struct file_lock *fl)
2779 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2780 struct nfs4_delegation *dp;
2783 WARN(1, "(%p)->fl_owner NULL\n", fl);
2786 if (fp->fi_had_conflict) {
2787 WARN(1, "duplicate break on %p\n", fp);
2791 * We don't want the locks code to timeout the lease for us;
2792 * we'll remove it ourself if a delegation isn't returned
2795 fl->fl_break_time = 0;
2797 spin_lock(&state_lock);
2798 fp->fi_had_conflict = true;
2799 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2800 nfsd_break_one_deleg(dp);
2801 spin_unlock(&state_lock);
2805 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2808 return lease_modify(onlist, arg);
2813 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2814 .lm_break = nfsd_break_deleg_cb,
2815 .lm_change = nfsd_change_deleg_cb,
2818 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2820 if (nfsd4_has_session(cstate))
2822 if (seqid == so->so_seqid - 1)
2823 return nfserr_replay_me;
2824 if (seqid == so->so_seqid)
2826 return nfserr_bad_seqid;
2830 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2831 struct nfsd4_open *open, struct nfsd_net *nn)
2833 clientid_t *clientid = &open->op_clientid;
2834 struct nfs4_client *clp = NULL;
2835 unsigned int strhashval;
2836 struct nfs4_openowner *oo = NULL;
2839 if (STALE_CLIENTID(&open->op_clientid, nn))
2840 return nfserr_stale_clientid;
2842 * In case we need it later, after we've already created the
2843 * file and don't want to risk a further failure:
2845 open->op_file = nfsd4_alloc_file();
2846 if (open->op_file == NULL)
2847 return nfserr_jukebox;
2849 strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2850 oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2851 open->op_openowner = oo;
2853 clp = find_confirmed_client(clientid, cstate->minorversion,
2856 return nfserr_expired;
2859 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2860 /* Replace unconfirmed owners without checking for replay. */
2861 clp = oo->oo_owner.so_client;
2862 release_openowner(oo);
2863 open->op_openowner = NULL;
2866 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2869 clp = oo->oo_owner.so_client;
2872 oo = alloc_init_open_stateowner(strhashval, clp, open);
2874 return nfserr_jukebox;
2875 open->op_openowner = oo;
2877 open->op_stp = nfs4_alloc_stateid(clp);
2879 return nfserr_jukebox;
2883 static inline __be32
2884 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2886 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2887 return nfserr_openmode;
2892 static int share_access_to_flags(u32 share_access)
2894 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2897 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2899 struct nfs4_stid *ret;
2901 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2904 return delegstateid(ret);
2907 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2909 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2910 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2914 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2915 struct nfs4_delegation **dp)
2918 __be32 status = nfserr_bad_stateid;
2920 *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2923 flags = share_access_to_flags(open->op_share_access);
2924 status = nfs4_check_delegmode(*dp, flags);
2928 if (!nfsd4_is_deleg_cur(open))
2932 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2937 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2939 struct nfs4_ol_stateid *local;
2940 struct nfs4_openowner *oo = open->op_openowner;
2942 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2943 /* ignore lock owners */
2944 if (local->st_stateowner->so_is_open_owner == 0)
2946 /* remember if we have seen this open owner */
2947 if (local->st_stateowner == &oo->oo_owner)
2949 /* check for conflicting share reservations */
2950 if (!test_share(local, open))
2951 return nfserr_share_denied;
2956 static inline int nfs4_access_to_access(u32 nfs4_access)
2960 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2961 flags |= NFSD_MAY_READ;
2962 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2963 flags |= NFSD_MAY_WRITE;
2967 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2968 struct svc_fh *cur_fh, struct nfsd4_open *open)
2971 int oflag = nfs4_access_to_omode(open->op_share_access);
2972 int access = nfs4_access_to_access(open->op_share_access);
2974 if (!fp->fi_fds[oflag]) {
2975 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2976 &fp->fi_fds[oflag]);
2980 nfs4_file_get_access(fp, oflag);
2985 static inline __be32
2986 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2987 struct nfsd4_open *open)
2989 struct iattr iattr = {
2990 .ia_valid = ATTR_SIZE,
2993 if (!open->op_truncate)
2995 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2996 return nfserr_inval;
2997 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
3001 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)
3003 u32 op_share_access = open->op_share_access;
3007 new_access = !test_access(op_share_access, stp);
3009 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
3013 status = nfsd4_truncate(rqstp, cur_fh, open);
3016 int oflag = nfs4_access_to_omode(op_share_access);
3017 nfs4_file_put_access(fp, oflag);
3021 /* remember the open */
3022 set_access(op_share_access, stp);
3023 set_deny(open->op_share_deny, stp);
3030 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3032 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3035 /* Should we give out recallable state?: */
3036 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3038 if (clp->cl_cb_state == NFSD4_CB_UP)
3041 * In the sessions case, since we don't have to establish a
3042 * separate connection for callbacks, we assume it's OK
3043 * until we hear otherwise:
3045 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3048 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3050 struct file_lock *fl;
3052 fl = locks_alloc_lock();
3055 locks_init_lock(fl);
3056 fl->fl_lmops = &nfsd_lease_mng_ops;
3057 fl->fl_flags = FL_DELEG;
3058 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3059 fl->fl_end = OFFSET_MAX;
3060 fl->fl_owner = (fl_owner_t)(dp->dl_file);
3061 fl->fl_pid = current->tgid;
3065 static int nfs4_setlease(struct nfs4_delegation *dp)
3067 struct nfs4_file *fp = dp->dl_file;
3068 struct file_lock *fl;
3071 fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3074 fl->fl_file = find_readable_file(fp);
3075 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3079 fp->fi_deleg_file = get_file(fl->fl_file);
3080 atomic_set(&fp->fi_delegees, 1);
3081 spin_lock(&state_lock);
3082 hash_delegation_locked(dp, fp);
3083 spin_unlock(&state_lock);
3086 locks_free_lock(fl);
3090 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3092 if (fp->fi_had_conflict)
3097 return nfs4_setlease(dp);
3098 spin_lock(&state_lock);
3099 atomic_inc(&fp->fi_delegees);
3100 if (fp->fi_had_conflict) {
3101 spin_unlock(&state_lock);
3104 hash_delegation_locked(dp, fp);
3105 spin_unlock(&state_lock);
3109 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3111 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3112 if (status == -EAGAIN)
3113 open->op_why_no_deleg = WND4_CONTENTION;
3115 open->op_why_no_deleg = WND4_RESOURCE;
3116 switch (open->op_deleg_want) {
3117 case NFS4_SHARE_WANT_READ_DELEG:
3118 case NFS4_SHARE_WANT_WRITE_DELEG:
3119 case NFS4_SHARE_WANT_ANY_DELEG:
3121 case NFS4_SHARE_WANT_CANCEL:
3122 open->op_why_no_deleg = WND4_CANCELLED;
3124 case NFS4_SHARE_WANT_NO_DELEG:
3131 * Attempt to hand out a delegation.
3133 * Note we don't support write delegations, and won't until the vfs has
3134 * proper support for them.
3137 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3138 struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3140 struct nfs4_delegation *dp;
3141 struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3145 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3146 open->op_recall = 0;
3147 switch (open->op_claim_type) {
3148 case NFS4_OPEN_CLAIM_PREVIOUS:
3150 open->op_recall = 1;
3151 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3154 case NFS4_OPEN_CLAIM_NULL:
3155 case NFS4_OPEN_CLAIM_FH:
3157 * Let's not give out any delegations till everyone's
3158 * had the chance to reclaim theirs....
3160 if (locks_in_grace(net))
3162 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3165 * Also, if the file was opened for write or
3166 * create, there's a good chance the client's
3167 * about to write to it, resulting in an
3168 * immediate recall (since we don't support
3169 * write delegations):
3171 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3173 if (open->op_create == NFS4_OPEN_CREATE)
3179 dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3182 status = nfs4_set_delegation(dp, stp->st_file);
3186 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3188 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3189 STATEID_VAL(&dp->dl_stid.sc_stateid));
3190 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3193 destroy_delegation(dp);
3195 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3196 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3197 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3198 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3199 open->op_recall = 1;
3202 /* 4.1 client asking for a delegation? */
3203 if (open->op_deleg_want)
3204 nfsd4_open_deleg_none_ext(open, status);
3208 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3209 struct nfs4_delegation *dp)
3211 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3212 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3213 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3214 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3215 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3216 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3217 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3218 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3220 /* Otherwise the client must be confused wanting a delegation
3221 * it already has, therefore we don't return
3222 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3227 * called with nfs4_lock_state() held.
3230 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3232 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3233 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3234 struct nfs4_file *fp = NULL;
3235 struct inode *ino = current_fh->fh_dentry->d_inode;
3236 struct nfs4_ol_stateid *stp = NULL;
3237 struct nfs4_delegation *dp = NULL;
3241 * Lookup file; if found, lookup stateid and check open request,
3242 * and check for delegations in the process of being recalled.
3243 * If not found, create the nfs4_file struct
3245 fp = find_file(ino);
3247 if ((status = nfs4_check_open(fp, open, &stp)))
3249 status = nfs4_check_deleg(cl, open, &dp);
3253 status = nfserr_bad_stateid;
3254 if (nfsd4_is_deleg_cur(open))
3256 status = nfserr_jukebox;
3258 open->op_file = NULL;
3259 nfsd4_init_file(fp, ino);
3263 * OPEN the file, or upgrade an existing OPEN.
3264 * If truncate fails, the OPEN fails.
3267 /* Stateid was found, this is an OPEN upgrade */
3268 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3272 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3275 status = nfsd4_truncate(rqstp, current_fh, open);
3279 open->op_stp = NULL;
3280 init_open_stateid(stp, fp, open);
3282 update_stateid(&stp->st_stid.sc_stateid);
3283 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3285 if (nfsd4_has_session(&resp->cstate)) {
3286 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3288 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3289 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3290 open->op_why_no_deleg = WND4_NOT_WANTED;
3296 * Attempt to hand out a delegation. No error return, because the
3297 * OPEN succeeds even if we fail.
3299 nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3303 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3304 STATEID_VAL(&stp->st_stid.sc_stateid));
3306 /* 4.1 client trying to upgrade/downgrade delegation? */
3307 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3308 open->op_deleg_want)
3309 nfsd4_deleg_xgrade_none_ext(open, dp);
3313 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3314 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3316 * To finish the open response, we just need to set the rflags.
3318 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3319 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3320 !nfsd4_has_session(&resp->cstate))
3321 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3326 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3328 if (open->op_openowner) {
3329 struct nfs4_openowner *oo = open->op_openowner;
3331 if (!list_empty(&oo->oo_owner.so_stateids))
3332 list_del_init(&oo->oo_close_lru);
3333 if (oo->oo_flags & NFS4_OO_NEW) {
3335 release_openowner(oo);
3336 open->op_openowner = NULL;
3338 oo->oo_flags &= ~NFS4_OO_NEW;
3342 nfsd4_free_file(open->op_file);
3344 free_generic_stateid(open->op_stp);
3347 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3349 struct nfs4_client *found;
3351 if (STALE_CLIENTID(clid, nn))
3352 return nfserr_stale_clientid;
3353 found = find_confirmed_client(clid, session, nn);
3356 return found ? nfs_ok : nfserr_expired;
3360 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3363 struct nfs4_client *clp;
3365 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3368 dprintk("process_renew(%08x/%08x): starting\n",
3369 clid->cl_boot, clid->cl_id);
3370 status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3373 status = nfserr_cb_path_down;
3374 if (!list_empty(&clp->cl_delegations)
3375 && clp->cl_cb_state != NFSD4_CB_UP)
3379 nfs4_unlock_state();
3384 nfsd4_end_grace(struct nfsd_net *nn)
3386 /* do nothing if grace period already ended */
3387 if (nn->grace_ended)
3390 dprintk("NFSD: end of grace period\n");
3391 nn->grace_ended = true;
3392 nfsd4_record_grace_done(nn, nn->boot_time);
3393 locks_end_grace(&nn->nfsd4_manager);
3395 * Now that every NFSv4 client has had the chance to recover and
3396 * to see the (possibly new, possibly shorter) lease time, we
3397 * can safely set the next grace time to the current lease time:
3399 nn->nfsd4_grace = nn->nfsd4_lease;
3403 nfs4_laundromat(struct nfsd_net *nn)
3405 struct nfs4_client *clp;
3406 struct nfs4_openowner *oo;
3407 struct nfs4_delegation *dp;
3408 struct list_head *pos, *next, reaplist;
3409 time_t cutoff = get_seconds() - nn->nfsd4_lease;
3410 time_t t, new_timeo = nn->nfsd4_lease;
3414 dprintk("NFSD: laundromat service - starting\n");
3415 nfsd4_end_grace(nn);
3416 INIT_LIST_HEAD(&reaplist);
3417 spin_lock(&nn->client_lock);
3418 list_for_each_safe(pos, next, &nn->client_lru) {
3419 clp = list_entry(pos, struct nfs4_client, cl_lru);
3420 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3421 t = clp->cl_time - cutoff;
3422 new_timeo = min(new_timeo, t);
3425 if (mark_client_expired_locked(clp)) {
3426 dprintk("NFSD: client in use (clientid %08x)\n",
3427 clp->cl_clientid.cl_id);
3430 list_move(&clp->cl_lru, &reaplist);
3432 spin_unlock(&nn->client_lock);
3433 list_for_each_safe(pos, next, &reaplist) {
3434 clp = list_entry(pos, struct nfs4_client, cl_lru);
3435 dprintk("NFSD: purging unused client (clientid %08x)\n",
3436 clp->cl_clientid.cl_id);
3439 spin_lock(&state_lock);
3440 list_for_each_safe(pos, next, &nn->del_recall_lru) {
3441 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3442 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3444 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3445 t = dp->dl_time - cutoff;
3446 new_timeo = min(new_timeo, t);
3449 list_move(&dp->dl_recall_lru, &reaplist);
3451 spin_unlock(&state_lock);
3452 list_for_each_safe(pos, next, &reaplist) {
3453 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3454 revoke_delegation(dp);
3456 list_for_each_safe(pos, next, &nn->close_lru) {
3457 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3458 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3459 t = oo->oo_time - cutoff;
3460 new_timeo = min(new_timeo, t);
3463 release_openowner(oo);
3465 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
3466 nfs4_unlock_state();
3470 static struct workqueue_struct *laundry_wq;
3471 static void laundromat_main(struct work_struct *);
3474 laundromat_main(struct work_struct *laundry)
3477 struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3479 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3482 t = nfs4_laundromat(nn);
3483 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3484 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3487 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3489 if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3490 return nfserr_bad_stateid;
3495 access_permit_read(struct nfs4_ol_stateid *stp)
3497 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3498 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3499 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3503 access_permit_write(struct nfs4_ol_stateid *stp)
3505 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3506 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3510 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3512 __be32 status = nfserr_openmode;
3514 /* For lock stateid's, we test the parent open, not the lock: */
3515 if (stp->st_openstp)
3516 stp = stp->st_openstp;
3517 if ((flags & WR_STATE) && !access_permit_write(stp))
3519 if ((flags & RD_STATE) && !access_permit_read(stp))
3526 static inline __be32
3527 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3529 if (ONE_STATEID(stateid) && (flags & RD_STATE))
3531 else if (locks_in_grace(net)) {
3532 /* Answer in remaining cases depends on existence of
3533 * conflicting state; so we must wait out the grace period. */
3534 return nfserr_grace;
3535 } else if (flags & WR_STATE)
3536 return nfs4_share_conflict(current_fh,
3537 NFS4_SHARE_DENY_WRITE);
3538 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3539 return nfs4_share_conflict(current_fh,
3540 NFS4_SHARE_DENY_READ);
3544 * Allow READ/WRITE during grace period on recovered state only for files
3545 * that are not able to provide mandatory locking.
3548 grace_disallows_io(struct net *net, struct inode *inode)
3550 return locks_in_grace(net) && mandatory_lock(inode);
3553 /* Returns true iff a is later than b: */
3554 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3556 return (s32)(a->si_generation - b->si_generation) > 0;
3559 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3562 * When sessions are used the stateid generation number is ignored
3565 if (has_session && in->si_generation == 0)
3568 if (in->si_generation == ref->si_generation)
3571 /* If the client sends us a stateid from the future, it's buggy: */
3572 if (stateid_generation_after(in, ref))
3573 return nfserr_bad_stateid;
3575 * However, we could see a stateid from the past, even from a
3576 * non-buggy client. For example, if the client sends a lock
3577 * while some IO is outstanding, the lock may bump si_generation
3578 * while the IO is still in flight. The client could avoid that
3579 * situation by waiting for responses on all the IO requests,
3580 * but better performance may result in retrying IO that
3581 * receives an old_stateid error if requests are rarely
3582 * reordered in flight:
3584 return nfserr_old_stateid;
3587 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3589 struct nfs4_stid *s;
3590 struct nfs4_ol_stateid *ols;
3593 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3594 return nfserr_bad_stateid;
3595 /* Client debugging aid. */
3596 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3597 char addr_str[INET6_ADDRSTRLEN];
3598 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3600 pr_warn_ratelimited("NFSD: client %s testing state ID "
3601 "with incorrect client ID\n", addr_str);
3602 return nfserr_bad_stateid;
3604 s = find_stateid(cl, stateid);
3606 return nfserr_bad_stateid;
3607 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3610 switch (s->sc_type) {
3611 case NFS4_DELEG_STID:
3613 case NFS4_REVOKED_DELEG_STID:
3614 return nfserr_deleg_revoked;
3615 case NFS4_OPEN_STID:
3616 case NFS4_LOCK_STID:
3617 ols = openlockstateid(s);
3618 if (ols->st_stateowner->so_is_open_owner
3619 && !(openowner(ols->st_stateowner)->oo_flags
3620 & NFS4_OO_CONFIRMED))
3621 return nfserr_bad_stateid;
3624 printk("unknown stateid type %x\n", s->sc_type);
3625 case NFS4_CLOSED_STID:
3626 return nfserr_bad_stateid;
3630 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3631 struct nfs4_stid **s, bool sessions,
3632 struct nfsd_net *nn)
3634 struct nfs4_client *cl;
3637 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3638 return nfserr_bad_stateid;
3639 status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3641 if (status == nfserr_stale_clientid) {
3643 return nfserr_bad_stateid;
3644 return nfserr_stale_stateid;
3648 *s = find_stateid_by_type(cl, stateid, typemask);
3650 return nfserr_bad_stateid;
3655 * Checks for stateid operations
3658 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3659 stateid_t *stateid, int flags, struct file **filpp)
3661 struct nfs4_stid *s;
3662 struct nfs4_ol_stateid *stp = NULL;
3663 struct nfs4_delegation *dp = NULL;
3664 struct svc_fh *current_fh = &cstate->current_fh;
3665 struct inode *ino = current_fh->fh_dentry->d_inode;
3666 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3667 struct file *file = NULL;
3673 if (grace_disallows_io(net, ino))
3674 return nfserr_grace;
3676 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3677 return check_special_stateids(net, current_fh, stateid, flags);
3681 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3682 &s, cstate->minorversion, nn);
3685 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3688 switch (s->sc_type) {
3689 case NFS4_DELEG_STID:
3690 dp = delegstateid(s);
3691 status = nfs4_check_delegmode(dp, flags);
3695 file = dp->dl_file->fi_deleg_file;
3698 status = nfserr_serverfault;
3703 case NFS4_OPEN_STID:
3704 case NFS4_LOCK_STID:
3705 stp = openlockstateid(s);
3706 status = nfs4_check_fh(current_fh, stp);
3709 if (stp->st_stateowner->so_is_open_owner
3710 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3712 status = nfs4_check_openmode(stp, flags);
3716 if (flags & RD_STATE)
3717 file = find_readable_file(stp->st_file);
3719 file = find_writeable_file(stp->st_file);
3723 status = nfserr_bad_stateid;
3728 *filpp = get_file(file);
3730 nfs4_unlock_state();
3735 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3737 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
3739 if (check_for_locks(stp->st_file, lo))
3740 return nfserr_locks_held;
3742 * Currently there's a 1-1 lock stateid<->lockowner
3743 * correspondance, and we have to delete the lockowner when we
3744 * delete the lock stateid:
3746 release_lockowner(lo);
3751 * Test if the stateid is valid
3754 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3755 struct nfsd4_test_stateid *test_stateid)
3757 struct nfsd4_test_stateid_id *stateid;
3758 struct nfs4_client *cl = cstate->session->se_client;
3761 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3762 stateid->ts_id_status =
3763 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3764 nfs4_unlock_state();
3770 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3771 struct nfsd4_free_stateid *free_stateid)
3773 stateid_t *stateid = &free_stateid->fr_stateid;
3774 struct nfs4_stid *s;
3775 struct nfs4_delegation *dp;
3776 struct nfs4_client *cl = cstate->session->se_client;
3777 __be32 ret = nfserr_bad_stateid;
3780 s = find_stateid(cl, stateid);
3783 switch (s->sc_type) {
3784 case NFS4_DELEG_STID:
3785 ret = nfserr_locks_held;
3787 case NFS4_OPEN_STID:
3788 case NFS4_LOCK_STID:
3789 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3792 if (s->sc_type == NFS4_LOCK_STID)
3793 ret = nfsd4_free_lock_stateid(openlockstateid(s));
3795 ret = nfserr_locks_held;
3797 case NFS4_REVOKED_DELEG_STID:
3798 dp = delegstateid(s);
3799 destroy_revoked_delegation(dp);
3803 ret = nfserr_bad_stateid;
3806 nfs4_unlock_state();
3813 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3814 RD_STATE : WR_STATE;
3817 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3819 struct svc_fh *current_fh = &cstate->current_fh;
3820 struct nfs4_stateowner *sop = stp->st_stateowner;
3823 status = nfsd4_check_seqid(cstate, sop, seqid);
3826 if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3827 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3829 * "Closed" stateid's exist *only* to return
3830 * nfserr_replay_me from the previous step, and
3831 * revoked delegations are kept only for free_stateid.
3833 return nfserr_bad_stateid;
3834 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3837 return nfs4_check_fh(current_fh, stp);
3841 * Checks for sequence id mutating operations.
3844 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3845 stateid_t *stateid, char typemask,
3846 struct nfs4_ol_stateid **stpp,
3847 struct nfsd_net *nn)
3850 struct nfs4_stid *s;
3852 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3853 seqid, STATEID_VAL(stateid));
3856 status = nfsd4_lookup_stateid(stateid, typemask, &s,
3857 cstate->minorversion, nn);
3860 *stpp = openlockstateid(s);
3861 if (!nfsd4_has_session(cstate))
3862 cstate->replay_owner = (*stpp)->st_stateowner;
3864 return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3867 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3868 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3871 struct nfs4_openowner *oo;
3873 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3874 NFS4_OPEN_STID, stpp, nn);
3877 oo = openowner((*stpp)->st_stateowner);
3878 if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3879 return nfserr_bad_stateid;
3884 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3885 struct nfsd4_open_confirm *oc)
3888 struct nfs4_openowner *oo;
3889 struct nfs4_ol_stateid *stp;
3890 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3892 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
3893 cstate->current_fh.fh_dentry);
3895 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3901 status = nfs4_preprocess_seqid_op(cstate,
3902 oc->oc_seqid, &oc->oc_req_stateid,
3903 NFS4_OPEN_STID, &stp, nn);
3906 oo = openowner(stp->st_stateowner);
3907 status = nfserr_bad_stateid;
3908 if (oo->oo_flags & NFS4_OO_CONFIRMED)
3910 oo->oo_flags |= NFS4_OO_CONFIRMED;
3911 update_stateid(&stp->st_stid.sc_stateid);
3912 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3913 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3914 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3916 nfsd4_client_record_create(oo->oo_owner.so_client);
3919 nfsd4_bump_seqid(cstate, status);
3920 if (!cstate->replay_owner)
3921 nfs4_unlock_state();
3925 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3927 if (!test_access(access, stp))
3929 nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3930 clear_access(access, stp);
3933 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3935 switch (to_access) {
3936 case NFS4_SHARE_ACCESS_READ:
3937 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3938 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3940 case NFS4_SHARE_ACCESS_WRITE:
3941 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3942 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3944 case NFS4_SHARE_ACCESS_BOTH:
3952 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3955 for (i = 0; i < 4; i++) {
3956 if ((i & deny) != i)
3962 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3963 struct nfsd4_compound_state *cstate,
3964 struct nfsd4_open_downgrade *od)
3967 struct nfs4_ol_stateid *stp;
3968 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3970 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
3971 cstate->current_fh.fh_dentry);
3973 /* We don't yet support WANT bits: */
3974 if (od->od_deleg_want)
3975 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3979 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3980 &od->od_stateid, &stp, nn);
3983 status = nfserr_inval;
3984 if (!test_access(od->od_share_access, stp)) {
3985 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3986 stp->st_access_bmap, od->od_share_access);
3989 if (!test_deny(od->od_share_deny, stp)) {
3990 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3991 stp->st_deny_bmap, od->od_share_deny);
3994 nfs4_stateid_downgrade(stp, od->od_share_access);
3996 reset_union_bmap_deny(od->od_share_deny, stp);
3998 update_stateid(&stp->st_stid.sc_stateid);
3999 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4002 nfsd4_bump_seqid(cstate, status);
4003 if (!cstate->replay_owner)
4004 nfs4_unlock_state();
4008 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
4010 unhash_open_stateid(s);
4011 s->st_stid.sc_type = NFS4_CLOSED_STID;
4015 * nfs4_unlock_state() called after encode
4018 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4019 struct nfsd4_close *close)
4022 struct nfs4_openowner *oo;
4023 struct nfs4_ol_stateid *stp;
4024 struct net *net = SVC_NET(rqstp);
4025 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4027 dprintk("NFSD: nfsd4_close on file %pd\n",
4028 cstate->current_fh.fh_dentry);
4031 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4033 NFS4_OPEN_STID|NFS4_CLOSED_STID,
4035 nfsd4_bump_seqid(cstate, status);
4038 oo = openowner(stp->st_stateowner);
4039 update_stateid(&stp->st_stid.sc_stateid);
4040 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4042 nfsd4_close_open_stateid(stp);
4044 if (cstate->minorversion)
4045 free_generic_stateid(stp);
4047 oo->oo_last_closed_stid = stp;
4049 if (list_empty(&oo->oo_owner.so_stateids)) {
4050 if (cstate->minorversion)
4051 release_openowner(oo);
4054 * In the 4.0 case we need to keep the owners around a
4055 * little while to handle CLOSE replay.
4057 move_to_close_lru(oo, SVC_NET(rqstp));
4061 if (!cstate->replay_owner)
4062 nfs4_unlock_state();
4067 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4068 struct nfsd4_delegreturn *dr)
4070 struct nfs4_delegation *dp;
4071 stateid_t *stateid = &dr->dr_stateid;
4072 struct nfs4_stid *s;
4074 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4076 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4080 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
4081 cstate->minorversion, nn);
4084 dp = delegstateid(s);
4085 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4089 destroy_delegation(dp);
4091 nfs4_unlock_state();
4097 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
4099 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
4102 end_offset(u64 start, u64 len)
4107 return end >= start ? end: NFS4_MAX_UINT64;
4110 /* last octet in a range */
4112 last_byte_offset(u64 start, u64 len)
4118 return end > start ? end - 1: NFS4_MAX_UINT64;
4121 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4123 return (file_hashval(inode) + cl_id
4124 + opaque_hashval(ownername->data, ownername->len))
4125 & LOCKOWNER_INO_HASH_MASK;
4129 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4130 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4131 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
4132 * locking, this prevents us from being completely protocol-compliant. The
4133 * real solution to this problem is to start using unsigned file offsets in
4134 * the VFS, but this is a very deep change!
4137 nfs4_transform_lock_offset(struct file_lock *lock)
4139 if (lock->fl_start < 0)
4140 lock->fl_start = OFFSET_MAX;
4141 if (lock->fl_end < 0)
4142 lock->fl_end = OFFSET_MAX;
4145 /* Hack!: For now, we're defining this just so we can use a pointer to it
4146 * as a unique cookie to identify our (NFSv4's) posix locks. */
4147 static const struct lock_manager_operations nfsd_posix_mng_ops = {
4151 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4153 struct nfs4_lockowner *lo;
4155 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4156 lo = (struct nfs4_lockowner *) fl->fl_owner;
4157 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4158 lo->lo_owner.so_owner.len, GFP_KERNEL);
4159 if (!deny->ld_owner.data)
4160 /* We just don't care that much */
4162 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4163 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4166 deny->ld_owner.len = 0;
4167 deny->ld_owner.data = NULL;
4168 deny->ld_clientid.cl_boot = 0;
4169 deny->ld_clientid.cl_id = 0;
4171 deny->ld_start = fl->fl_start;
4172 deny->ld_length = NFS4_MAX_UINT64;
4173 if (fl->fl_end != NFS4_MAX_UINT64)
4174 deny->ld_length = fl->fl_end - fl->fl_start + 1;
4175 deny->ld_type = NFS4_READ_LT;
4176 if (fl->fl_type != F_RDLCK)
4177 deny->ld_type = NFS4_WRITE_LT;
4180 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
4182 struct nfs4_ol_stateid *lst;
4184 if (!same_owner_str(&lo->lo_owner, owner, clid))
4186 if (list_empty(&lo->lo_owner.so_stateids)) {
4190 lst = list_first_entry(&lo->lo_owner.so_stateids,
4191 struct nfs4_ol_stateid, st_perstateowner);
4192 return lst->st_file->fi_inode == inode;
4195 static struct nfs4_lockowner *
4196 find_lockowner_str(struct inode *inode, clientid_t *clid,
4197 struct xdr_netobj *owner, struct nfsd_net *nn)
4199 unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4200 struct nfs4_lockowner *lo;
4202 list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4203 if (same_lockowner_ino(lo, inode, clid, owner))
4209 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4211 struct inode *inode = open_stp->st_file->fi_inode;
4212 unsigned int inohash = lockowner_ino_hashval(inode,
4213 clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4214 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4216 list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4217 list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4218 list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
4222 * Alloc a lock owner structure.
4223 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
4226 * strhashval = ownerstr_hashval
4229 static struct nfs4_lockowner *
4230 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4231 struct nfs4_lockowner *lo;
4233 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4236 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4237 lo->lo_owner.so_is_open_owner = 0;
4238 /* It is the openowner seqid that will be incremented in encode in the
4239 * case of new lockowners; so increment the lock seqid manually: */
4240 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4241 hash_lockowner(lo, strhashval, clp, open_stp);
4245 static struct nfs4_ol_stateid *
4246 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4248 struct nfs4_ol_stateid *stp;
4249 struct nfs4_client *clp = lo->lo_owner.so_client;
4251 stp = nfs4_alloc_stateid(clp);
4254 stp->st_stid.sc_type = NFS4_LOCK_STID;
4255 list_add(&stp->st_perfile, &fp->fi_stateids);
4256 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4257 stp->st_stateowner = &lo->lo_owner;
4260 stp->st_access_bmap = 0;
4261 stp->st_deny_bmap = open_stp->st_deny_bmap;
4262 stp->st_openstp = open_stp;
4267 check_lock_length(u64 offset, u64 length)
4269 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
4270 LOFF_OVERFLOW(offset, length)));
4273 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4275 struct nfs4_file *fp = lock_stp->st_file;
4276 int oflag = nfs4_access_to_omode(access);
4278 if (test_access(access, lock_stp))
4280 nfs4_file_get_access(fp, oflag);
4281 set_access(access, lock_stp);
4284 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)
4286 struct nfs4_file *fi = ost->st_file;
4287 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4288 struct nfs4_client *cl = oo->oo_owner.so_client;
4289 struct nfs4_lockowner *lo;
4290 unsigned int strhashval;
4291 struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4293 lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4294 &lock->v.new.owner, nn);
4296 if (!cstate->minorversion)
4297 return nfserr_bad_seqid;
4298 /* XXX: a lockowner always has exactly one stateid: */
4299 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4300 struct nfs4_ol_stateid, st_perstateowner);
4303 strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4304 &lock->v.new.owner);
4305 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4307 return nfserr_jukebox;
4308 *lst = alloc_init_lock_stateid(lo, fi, ost);
4310 release_lockowner(lo);
4311 return nfserr_jukebox;
4321 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4322 struct nfsd4_lock *lock)
4324 struct nfs4_openowner *open_sop = NULL;
4325 struct nfs4_lockowner *lock_sop = NULL;
4326 struct nfs4_ol_stateid *lock_stp;
4327 struct file *filp = NULL;
4328 struct file_lock *file_lock = NULL;
4329 struct file_lock *conflock = NULL;
4331 bool new_state = false;
4334 struct net *net = SVC_NET(rqstp);
4335 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4337 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4338 (long long) lock->lk_offset,
4339 (long long) lock->lk_length);
4341 if (check_lock_length(lock->lk_offset, lock->lk_length))
4342 return nfserr_inval;
4344 if ((status = fh_verify(rqstp, &cstate->current_fh,
4345 S_IFREG, NFSD_MAY_LOCK))) {
4346 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4352 if (lock->lk_is_new) {
4353 struct nfs4_ol_stateid *open_stp = NULL;
4355 if (nfsd4_has_session(cstate))
4356 /* See rfc 5661 18.10.3: given clientid is ignored: */
4357 memcpy(&lock->v.new.clientid,
4358 &cstate->session->se_client->cl_clientid,
4359 sizeof(clientid_t));
4361 status = nfserr_stale_clientid;
4362 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4365 /* validate and update open stateid and open seqid */
4366 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4367 lock->lk_new_open_seqid,
4368 &lock->lk_new_open_stateid,
4372 open_sop = openowner(open_stp->st_stateowner);
4373 status = nfserr_bad_stateid;
4374 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4375 &lock->v.new.clientid))
4377 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4378 &lock_stp, &new_state);
4380 status = nfs4_preprocess_seqid_op(cstate,
4381 lock->lk_old_lock_seqid,
4382 &lock->lk_old_lock_stateid,
4383 NFS4_LOCK_STID, &lock_stp, nn);
4386 lock_sop = lockowner(lock_stp->st_stateowner);
4388 lkflg = setlkflg(lock->lk_type);
4389 status = nfs4_check_openmode(lock_stp, lkflg);
4393 status = nfserr_grace;
4394 if (locks_in_grace(net) && !lock->lk_reclaim)
4396 status = nfserr_no_grace;
4397 if (!locks_in_grace(net) && lock->lk_reclaim)
4400 file_lock = locks_alloc_lock();
4402 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4403 status = nfserr_jukebox;
4407 locks_init_lock(file_lock);
4408 switch (lock->lk_type) {
4411 filp = find_readable_file(lock_stp->st_file);
4413 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4414 file_lock->fl_type = F_RDLCK;
4417 case NFS4_WRITEW_LT:
4418 filp = find_writeable_file(lock_stp->st_file);
4420 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4421 file_lock->fl_type = F_WRLCK;
4424 status = nfserr_inval;
4428 status = nfserr_openmode;
4431 file_lock->fl_owner = (fl_owner_t)lock_sop;
4432 file_lock->fl_pid = current->tgid;
4433 file_lock->fl_file = filp;
4434 file_lock->fl_flags = FL_POSIX;
4435 file_lock->fl_lmops = &nfsd_posix_mng_ops;
4436 file_lock->fl_start = lock->lk_offset;
4437 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4438 nfs4_transform_lock_offset(file_lock);
4440 conflock = locks_alloc_lock();
4442 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4443 status = nfserr_jukebox;
4447 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4449 case 0: /* success! */
4450 update_stateid(&lock_stp->st_stid.sc_stateid);
4451 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4455 case (EAGAIN): /* conflock holds conflicting lock */
4456 status = nfserr_denied;
4457 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4458 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4461 status = nfserr_deadlock;
4464 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4465 status = nfserrno(err);
4469 if (status && new_state)
4470 release_lockowner(lock_sop);
4471 nfsd4_bump_seqid(cstate, status);
4472 if (!cstate->replay_owner)
4473 nfs4_unlock_state();
4475 locks_free_lock(file_lock);
4477 locks_free_lock(conflock);
4482 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4483 * so we do a temporary open here just to get an open file to pass to
4484 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
4487 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4490 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4492 err = nfserrno(vfs_test_lock(file, lock));
4502 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4503 struct nfsd4_lockt *lockt)
4505 struct inode *inode;
4506 struct file_lock *file_lock = NULL;
4507 struct nfs4_lockowner *lo;
4509 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4511 if (locks_in_grace(SVC_NET(rqstp)))
4512 return nfserr_grace;
4514 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4515 return nfserr_inval;
4519 if (!nfsd4_has_session(cstate)) {
4520 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4525 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4528 inode = cstate->current_fh.fh_dentry->d_inode;
4529 file_lock = locks_alloc_lock();
4531 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4532 status = nfserr_jukebox;
4535 locks_init_lock(file_lock);
4536 switch (lockt->lt_type) {
4539 file_lock->fl_type = F_RDLCK;
4542 case NFS4_WRITEW_LT:
4543 file_lock->fl_type = F_WRLCK;
4546 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4547 status = nfserr_inval;
4551 lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4553 file_lock->fl_owner = (fl_owner_t)lo;
4554 file_lock->fl_pid = current->tgid;
4555 file_lock->fl_flags = FL_POSIX;
4557 file_lock->fl_start = lockt->lt_offset;
4558 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4560 nfs4_transform_lock_offset(file_lock);
4562 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4566 if (file_lock->fl_type != F_UNLCK) {
4567 status = nfserr_denied;
4568 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4571 nfs4_unlock_state();
4573 locks_free_lock(file_lock);
4578 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4579 struct nfsd4_locku *locku)
4581 struct nfs4_ol_stateid *stp;
4582 struct file *filp = NULL;
4583 struct file_lock *file_lock = NULL;
4586 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4588 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4589 (long long) locku->lu_offset,
4590 (long long) locku->lu_length);
4592 if (check_lock_length(locku->lu_offset, locku->lu_length))
4593 return nfserr_inval;
4597 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4598 &locku->lu_stateid, NFS4_LOCK_STID,
4602 filp = find_any_file(stp->st_file);
4604 status = nfserr_lock_range;
4607 file_lock = locks_alloc_lock();
4609 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4610 status = nfserr_jukebox;
4613 locks_init_lock(file_lock);
4614 file_lock->fl_type = F_UNLCK;
4615 file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4616 file_lock->fl_pid = current->tgid;
4617 file_lock->fl_file = filp;
4618 file_lock->fl_flags = FL_POSIX;
4619 file_lock->fl_lmops = &nfsd_posix_mng_ops;
4620 file_lock->fl_start = locku->lu_offset;
4622 file_lock->fl_end = last_byte_offset(locku->lu_offset,
4624 nfs4_transform_lock_offset(file_lock);
4626 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4628 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4631 update_stateid(&stp->st_stid.sc_stateid);
4632 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4635 nfsd4_bump_seqid(cstate, status);
4636 if (!cstate->replay_owner)
4637 nfs4_unlock_state();
4639 locks_free_lock(file_lock);
4643 status = nfserrno(err);
4649 * 1: locks held by lockowner
4650 * 0: no locks held by lockowner
4653 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4655 struct file_lock **flpp;
4656 struct inode *inode = filp->fi_inode;
4659 spin_lock(&inode->i_lock);
4660 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4661 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4667 spin_unlock(&inode->i_lock);
4672 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4673 struct nfsd4_compound_state *cstate,
4674 struct nfsd4_release_lockowner *rlockowner)
4676 clientid_t *clid = &rlockowner->rl_clientid;
4677 struct nfs4_stateowner *sop;
4678 struct nfs4_lockowner *lo;
4679 struct nfs4_ol_stateid *stp;
4680 struct xdr_netobj *owner = &rlockowner->rl_owner;
4681 struct list_head matches;
4682 unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4684 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4686 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4687 clid->cl_boot, clid->cl_id);
4691 status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4695 status = nfserr_locks_held;
4696 INIT_LIST_HEAD(&matches);
4698 list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4699 if (sop->so_is_open_owner)
4701 if (!same_owner_str(sop, owner, clid))
4703 list_for_each_entry(stp, &sop->so_stateids,
4705 lo = lockowner(sop);
4706 if (check_for_locks(stp->st_file, lo))
4708 list_add(&lo->lo_list, &matches);
4711 /* Clients probably won't expect us to return with some (but not all)
4712 * of the lockowner state released; so don't release any until all
4713 * have been checked. */
4715 while (!list_empty(&matches)) {
4716 lo = list_entry(matches.next, struct nfs4_lockowner,
4718 /* unhash_stateowner deletes so_perclient only
4719 * for openowners. */
4720 list_del(&lo->lo_list);
4721 release_lockowner(lo);
4724 nfs4_unlock_state();
4728 static inline struct nfs4_client_reclaim *
4731 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4735 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4737 struct nfs4_client_reclaim *crp;
4739 crp = nfsd4_find_reclaim_client(name, nn);
4740 return (crp && crp->cr_clp);
4744 * failure => all reset bets are off, nfserr_no_grace...
4746 struct nfs4_client_reclaim *
4747 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4749 unsigned int strhashval;
4750 struct nfs4_client_reclaim *crp;
4752 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4753 crp = alloc_reclaim();
4755 strhashval = clientstr_hashval(name);
4756 INIT_LIST_HEAD(&crp->cr_strhash);
4757 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4758 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4760 nn->reclaim_str_hashtbl_size++;
4766 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4768 list_del(&crp->cr_strhash);
4770 nn->reclaim_str_hashtbl_size--;
4774 nfs4_release_reclaim(struct nfsd_net *nn)
4776 struct nfs4_client_reclaim *crp = NULL;
4779 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4780 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4781 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4782 struct nfs4_client_reclaim, cr_strhash);
4783 nfs4_remove_reclaim_record(crp, nn);
4786 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4790 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4791 struct nfs4_client_reclaim *
4792 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4794 unsigned int strhashval;
4795 struct nfs4_client_reclaim *crp = NULL;
4797 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4799 strhashval = clientstr_hashval(recdir);
4800 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4801 if (same_name(crp->cr_recdir, recdir)) {
4809 * Called from OPEN. Look for clientid in reclaim list.
4812 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4814 struct nfs4_client *clp;
4816 /* find clientid in conf_id_hashtbl */
4817 clp = find_confirmed_client(clid, sessions, nn);
4819 return nfserr_reclaim_bad;
4821 return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4824 #ifdef CONFIG_NFSD_FAULT_INJECTION
4826 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4828 if (mark_client_expired(clp))
4834 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4836 char buf[INET6_ADDRSTRLEN];
4837 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4838 printk(KERN_INFO "NFS Client: %s\n", buf);
4842 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4845 char buf[INET6_ADDRSTRLEN];
4846 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4847 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4850 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4852 struct nfs4_openowner *oop;
4853 struct nfs4_lockowner *lop, *lo_next;
4854 struct nfs4_ol_stateid *stp, *st_next;
4857 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4858 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4859 list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4871 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4873 return nfsd_foreach_client_lock(clp, max, release_lockowner);
4876 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4878 u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4879 nfsd_print_count(clp, count, "locked files");
4883 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4885 struct nfs4_openowner *oop, *next;
4888 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4898 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4900 return nfsd_foreach_client_open(clp, max, release_openowner);
4903 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4905 u64 count = nfsd_foreach_client_open(clp, max, NULL);
4906 nfsd_print_count(clp, count, "open files");
4910 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4911 struct list_head *victims)
4913 struct nfs4_delegation *dp, *next;
4916 lockdep_assert_held(&state_lock);
4917 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4919 list_move(&dp->dl_recall_lru, victims);
4926 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4928 struct nfs4_delegation *dp, *next;
4932 spin_lock(&state_lock);
4933 count = nfsd_find_all_delegations(clp, max, &victims);
4934 spin_unlock(&state_lock);
4936 list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4937 revoke_delegation(dp);
4942 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4944 struct nfs4_delegation *dp, *next;
4948 spin_lock(&state_lock);
4949 count = nfsd_find_all_delegations(clp, max, &victims);
4950 list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4951 nfsd_break_one_deleg(dp);
4952 spin_unlock(&state_lock);
4957 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4961 spin_lock(&state_lock);
4962 count = nfsd_find_all_delegations(clp, max, NULL);
4963 spin_unlock(&state_lock);
4965 nfsd_print_count(clp, count, "delegations");
4969 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4971 struct nfs4_client *clp, *next;
4973 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4975 if (!nfsd_netns_ready(nn))
4978 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4979 count += func(clp, max - count);
4980 if ((max != 0) && (count >= max))
4987 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4989 struct nfs4_client *clp;
4990 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4992 if (!nfsd_netns_ready(nn))
4995 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4996 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
5002 #endif /* CONFIG_NFSD_FAULT_INJECTION */
5005 * Since the lifetime of a delegation isn't limited to that of an open, a
5006 * client may quite reasonably hang on to a delegation as long as it has
5007 * the inode cached. This becomes an obvious problem the first time a
5008 * client's inode cache approaches the size of the server's total memory.
5010 * For now we avoid this problem by imposing a hard limit on the number
5011 * of delegations, which varies according to the server's memory size.
5014 set_max_delegations(void)
5017 * Allow at most 4 delegations per megabyte of RAM. Quick
5018 * estimates suggest that in the worst case (where every delegation
5019 * is for a different inode), a delegation could take about 1.5K,
5020 * giving a worst case usage of about 6% of memory.
5022 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
5025 static int nfs4_state_create_net(struct net *net)
5027 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5030 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5031 CLIENT_HASH_SIZE, GFP_KERNEL);
5032 if (!nn->conf_id_hashtbl)
5034 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5035 CLIENT_HASH_SIZE, GFP_KERNEL);
5036 if (!nn->unconf_id_hashtbl)
5038 nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5039 OWNER_HASH_SIZE, GFP_KERNEL);
5040 if (!nn->ownerstr_hashtbl)
5042 nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
5043 LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
5044 if (!nn->lockowner_ino_hashtbl)
5045 goto err_lockowner_ino;
5046 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5047 SESSION_HASH_SIZE, GFP_KERNEL);
5048 if (!nn->sessionid_hashtbl)
5051 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5052 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5053 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5055 for (i = 0; i < OWNER_HASH_SIZE; i++)
5056 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5057 for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
5058 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
5059 for (i = 0; i < SESSION_HASH_SIZE; i++)
5060 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5061 nn->conf_name_tree = RB_ROOT;
5062 nn->unconf_name_tree = RB_ROOT;
5063 INIT_LIST_HEAD(&nn->client_lru);
5064 INIT_LIST_HEAD(&nn->close_lru);
5065 INIT_LIST_HEAD(&nn->del_recall_lru);
5066 spin_lock_init(&nn->client_lock);
5068 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
5074 kfree(nn->lockowner_ino_hashtbl);
5076 kfree(nn->ownerstr_hashtbl);
5078 kfree(nn->unconf_id_hashtbl);
5080 kfree(nn->conf_id_hashtbl);
5086 nfs4_state_destroy_net(struct net *net)
5089 struct nfs4_client *clp = NULL;
5090 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5092 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5093 while (!list_empty(&nn->conf_id_hashtbl[i])) {
5094 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5095 destroy_client(clp);
5099 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5100 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5101 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5102 destroy_client(clp);
5106 kfree(nn->sessionid_hashtbl);
5107 kfree(nn->lockowner_ino_hashtbl);
5108 kfree(nn->ownerstr_hashtbl);
5109 kfree(nn->unconf_id_hashtbl);
5110 kfree(nn->conf_id_hashtbl);
5115 nfs4_state_start_net(struct net *net)
5117 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5120 ret = nfs4_state_create_net(net);
5123 nfsd4_client_tracking_init(net);
5124 nn->boot_time = get_seconds();
5125 locks_start_grace(net, &nn->nfsd4_manager);
5126 nn->grace_ended = false;
5127 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5128 nn->nfsd4_grace, net);
5129 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5133 /* initialization to perform when the nfsd service is started: */
5136 nfs4_state_start(void)
5140 ret = set_callback_cred();
5143 laundry_wq = create_singlethread_workqueue("nfsd4");
5144 if (laundry_wq == NULL) {
5148 ret = nfsd4_create_callback_queue();
5150 goto out_free_laundry;
5152 set_max_delegations();
5157 destroy_workqueue(laundry_wq);
5163 nfs4_state_shutdown_net(struct net *net)
5165 struct nfs4_delegation *dp = NULL;
5166 struct list_head *pos, *next, reaplist;
5167 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5169 cancel_delayed_work_sync(&nn->laundromat_work);
5170 locks_end_grace(&nn->nfsd4_manager);
5173 INIT_LIST_HEAD(&reaplist);
5174 spin_lock(&state_lock);
5175 list_for_each_safe(pos, next, &nn->del_recall_lru) {
5176 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5177 list_move(&dp->dl_recall_lru, &reaplist);
5179 spin_unlock(&state_lock);
5180 list_for_each_safe(pos, next, &reaplist) {
5181 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5182 destroy_delegation(dp);
5185 nfsd4_client_tracking_exit(net);
5186 nfs4_state_destroy_net(net);
5187 nfs4_unlock_state();
5191 nfs4_state_shutdown(void)
5193 destroy_workqueue(laundry_wq);
5194 nfsd4_destroy_callback_queue();
5198 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5200 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5201 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5205 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5207 if (cstate->minorversion) {
5208 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5209 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5214 clear_current_stateid(struct nfsd4_compound_state *cstate)
5216 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5220 * functions to set current state id
5223 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5225 put_stateid(cstate, &odp->od_stateid);
5229 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5231 put_stateid(cstate, &open->op_stateid);
5235 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5237 put_stateid(cstate, &close->cl_stateid);
5241 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5243 put_stateid(cstate, &lock->lk_resp_stateid);
5247 * functions to consume current state id
5251 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5253 get_stateid(cstate, &odp->od_stateid);
5257 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5259 get_stateid(cstate, &drp->dr_stateid);
5263 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5265 get_stateid(cstate, &fsp->fr_stateid);
5269 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5271 get_stateid(cstate, &setattr->sa_stateid);
5275 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5277 get_stateid(cstate, &close->cl_stateid);
5281 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5283 get_stateid(cstate, &locku->lu_stateid);
5287 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5289 get_stateid(cstate, &read->rd_stateid);
5293 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5295 get_stateid(cstate, &write->wr_stateid);