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/clnt.h>
46 #include "current_stateid.h"
47 #include "fault_inject.h"
51 #define NFSDDBG_FACILITY NFSDDBG_PROC
54 time_t nfsd4_lease = 90; /* default lease time */
55 time_t nfsd4_grace = 90;
57 #define all_ones {{~0,~0},~0}
58 static const stateid_t one_stateid = {
60 .si_opaque = all_ones,
62 static const stateid_t zero_stateid = {
65 static const stateid_t currentstateid = {
69 static u64 current_sessionid = 1;
71 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
72 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
73 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
75 /* forward declarations */
76 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
80 /* Currently used for almost all code touching nfsv4 state: */
81 static DEFINE_MUTEX(client_mutex);
84 * Currently used for the del_recall_lru and file hash table. In an
85 * effort to decrease the scope of the client_mutex, this spinlock may
86 * eventually cover more:
88 static DEFINE_SPINLOCK(recall_lock);
90 static struct kmem_cache *openowner_slab = NULL;
91 static struct kmem_cache *lockowner_slab = NULL;
92 static struct kmem_cache *file_slab = NULL;
93 static struct kmem_cache *stateid_slab = NULL;
94 static struct kmem_cache *deleg_slab = NULL;
99 mutex_lock(&client_mutex);
102 static void free_session(struct kref *);
104 /* Must be called under the client_lock */
105 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
107 kref_put(&ses->se_ref, free_session);
110 static void nfsd4_get_session(struct nfsd4_session *ses)
112 kref_get(&ses->se_ref);
116 nfs4_unlock_state(void)
118 mutex_unlock(&client_mutex);
122 opaque_hashval(const void *ptr, int nbytes)
124 unsigned char *cptr = (unsigned char *) ptr;
134 static struct list_head del_recall_lru;
136 static void nfsd4_free_file(struct nfs4_file *f)
138 kmem_cache_free(file_slab, f);
142 put_nfs4_file(struct nfs4_file *fi)
144 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
145 list_del(&fi->fi_hash);
146 spin_unlock(&recall_lock);
153 get_nfs4_file(struct nfs4_file *fi)
155 atomic_inc(&fi->fi_ref);
158 static int num_delegations;
159 unsigned int max_delegations;
162 * Open owner state (share locks)
165 /* hash tables for lock and open owners */
166 #define OWNER_HASH_BITS 8
167 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
168 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
170 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
174 ret = opaque_hashval(ownername->data, ownername->len);
176 return ret & OWNER_HASH_MASK;
179 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
181 /* hash table for nfs4_file */
182 #define FILE_HASH_BITS 8
183 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
185 static unsigned int file_hashval(struct inode *ino)
187 /* XXX: why are we hashing on inode pointer, anyway? */
188 return hash_ptr(ino, FILE_HASH_BITS);
191 static struct list_head file_hashtbl[FILE_HASH_SIZE];
193 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
195 BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
196 atomic_inc(&fp->fi_access[oflag]);
199 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
201 if (oflag == O_RDWR) {
202 __nfs4_file_get_access(fp, O_RDONLY);
203 __nfs4_file_get_access(fp, O_WRONLY);
205 __nfs4_file_get_access(fp, oflag);
208 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
210 if (fp->fi_fds[oflag]) {
211 fput(fp->fi_fds[oflag]);
212 fp->fi_fds[oflag] = NULL;
216 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
218 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
219 nfs4_file_put_fd(fp, oflag);
221 * It's also safe to get rid of the RDWR open *if*
222 * we no longer have need of the other kind of access
223 * or if we already have the other kind of open:
225 if (fp->fi_fds[1-oflag]
226 || atomic_read(&fp->fi_access[1 - oflag]) == 0)
227 nfs4_file_put_fd(fp, O_RDWR);
231 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
233 if (oflag == O_RDWR) {
234 __nfs4_file_put_access(fp, O_RDONLY);
235 __nfs4_file_put_access(fp, O_WRONLY);
237 __nfs4_file_put_access(fp, oflag);
240 static inline int get_new_stid(struct nfs4_stid *stid)
242 static int min_stateid = 0;
243 struct idr *stateids = &stid->sc_client->cl_stateids;
247 error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
249 * Note: the necessary preallocation was done in
250 * nfs4_alloc_stateid(). The idr code caps the number of
251 * preallocations that can exist at a time, but the state lock
252 * prevents anyone from using ours before we get here:
256 * It shouldn't be a problem to reuse an opaque stateid value.
257 * I don't think it is for 4.1. But with 4.0 I worry that, for
258 * example, a stray write retransmission could be accepted by
259 * the server when it should have been rejected. Therefore,
260 * adopt a trick from the sctp code to attempt to maximize the
261 * amount of time until an id is reused, by ensuring they always
262 * "increase" (mod INT_MAX):
265 min_stateid = new_stid+1;
266 if (min_stateid == INT_MAX)
271 static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
273 stateid_t *s = &stid->sc_stateid;
276 stid->sc_type = type;
277 stid->sc_client = cl;
278 s->si_opaque.so_clid = cl->cl_clientid;
279 new_id = get_new_stid(stid);
280 s->si_opaque.so_id = (u32)new_id;
281 /* Will be incremented before return to client: */
282 s->si_generation = 0;
285 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
287 struct idr *stateids = &cl->cl_stateids;
289 if (!idr_pre_get(stateids, GFP_KERNEL))
292 * Note: if we fail here (or any time between now and the time
293 * we actually get the new idr), we won't need to undo the idr
294 * preallocation, since the idr code caps the number of
295 * preallocated entries.
297 return kmem_cache_alloc(slab, GFP_KERNEL);
300 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
302 return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
305 static struct nfs4_delegation *
306 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
308 struct nfs4_delegation *dp;
309 struct nfs4_file *fp = stp->st_file;
311 dprintk("NFSD alloc_init_deleg\n");
313 * Major work on the lease subsystem (for example, to support
314 * calbacks on stat) will be required before we can support
315 * write delegations properly.
317 if (type != NFS4_OPEN_DELEGATE_READ)
319 if (fp->fi_had_conflict)
321 if (num_delegations > max_delegations)
323 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
326 init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
328 * delegation seqid's are never incremented. The 4.1 special
329 * meaning of seqid 0 isn't meaningful, really, but let's avoid
330 * 0 anyway just for consistency and use 1:
332 dp->dl_stid.sc_stateid.si_generation = 1;
334 INIT_LIST_HEAD(&dp->dl_perfile);
335 INIT_LIST_HEAD(&dp->dl_perclnt);
336 INIT_LIST_HEAD(&dp->dl_recall_lru);
340 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
342 atomic_set(&dp->dl_count, 1);
343 nfsd4_init_callback(&dp->dl_recall);
348 nfs4_put_delegation(struct nfs4_delegation *dp)
350 if (atomic_dec_and_test(&dp->dl_count)) {
351 dprintk("NFSD: freeing dp %p\n",dp);
352 put_nfs4_file(dp->dl_file);
353 kmem_cache_free(deleg_slab, dp);
358 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
360 if (atomic_dec_and_test(&fp->fi_delegees)) {
361 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
363 fput(fp->fi_deleg_file);
364 fp->fi_deleg_file = NULL;
368 static void unhash_stid(struct nfs4_stid *s)
370 struct idr *stateids = &s->sc_client->cl_stateids;
372 idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
375 /* Called under the state lock. */
377 unhash_delegation(struct nfs4_delegation *dp)
379 unhash_stid(&dp->dl_stid);
380 list_del_init(&dp->dl_perclnt);
381 spin_lock(&recall_lock);
382 list_del_init(&dp->dl_perfile);
383 list_del_init(&dp->dl_recall_lru);
384 spin_unlock(&recall_lock);
385 nfs4_put_deleg_lease(dp->dl_file);
386 nfs4_put_delegation(dp);
393 /* client_lock protects the client lru list and session hash table */
394 static DEFINE_SPINLOCK(client_lock);
396 /* Hash tables for nfs4_clientid state */
397 #define CLIENT_HASH_BITS 4
398 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
399 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
401 static unsigned int clientid_hashval(u32 id)
403 return id & CLIENT_HASH_MASK;
406 static unsigned int clientstr_hashval(const char *name)
408 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
412 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
413 * used in reboot/reset lease grace period processing
415 * conf_id_hashtbl[], and conf_name_tree hold confirmed
416 * setclientid_confirmed info.
418 * unconf_id_hashtbl[] and unconf_name_tree hold unconfirmed
421 * client_lru holds client queue ordered by nfs4_client.cl_time
424 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
425 * for last close replay.
427 * All of the above fields are protected by the client_mutex.
429 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
430 static int reclaim_str_hashtbl_size = 0;
431 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
432 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
433 static struct rb_root conf_name_tree;
434 static struct rb_root unconf_name_tree;
435 static struct list_head client_lru;
436 static struct list_head close_lru;
439 * We store the NONE, READ, WRITE, and BOTH bits separately in the
440 * st_{access,deny}_bmap field of the stateid, in order to track not
441 * only what share bits are currently in force, but also what
442 * combinations of share bits previous opens have used. This allows us
443 * to enforce the recommendation of rfc 3530 14.2.19 that the server
444 * return an error if the client attempt to downgrade to a combination
445 * of share bits not explicable by closing some of its previous opens.
447 * XXX: This enforcement is actually incomplete, since we don't keep
448 * track of access/deny bit combinations; so, e.g., we allow:
450 * OPEN allow read, deny write
451 * OPEN allow both, deny none
452 * DOWNGRADE allow read, deny none
454 * which we should reject.
457 bmap_to_share_mode(unsigned long bmap) {
459 unsigned int access = 0;
461 for (i = 1; i < 4; i++) {
462 if (test_bit(i, &bmap))
469 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
470 unsigned int access, deny;
472 access = bmap_to_share_mode(stp->st_access_bmap);
473 deny = bmap_to_share_mode(stp->st_deny_bmap);
474 if ((access & open->op_share_deny) || (deny & open->op_share_access))
479 /* set share access for a given stateid */
481 set_access(u32 access, struct nfs4_ol_stateid *stp)
483 __set_bit(access, &stp->st_access_bmap);
486 /* clear share access for a given stateid */
488 clear_access(u32 access, struct nfs4_ol_stateid *stp)
490 __clear_bit(access, &stp->st_access_bmap);
493 /* test whether a given stateid has access */
495 test_access(u32 access, struct nfs4_ol_stateid *stp)
497 return test_bit(access, &stp->st_access_bmap);
500 /* set share deny for a given stateid */
502 set_deny(u32 access, struct nfs4_ol_stateid *stp)
504 __set_bit(access, &stp->st_deny_bmap);
507 /* clear share deny for a given stateid */
509 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
511 __clear_bit(access, &stp->st_deny_bmap);
514 /* test whether a given stateid is denying specific access */
516 test_deny(u32 access, struct nfs4_ol_stateid *stp)
518 return test_bit(access, &stp->st_deny_bmap);
521 static int nfs4_access_to_omode(u32 access)
523 switch (access & NFS4_SHARE_ACCESS_BOTH) {
524 case NFS4_SHARE_ACCESS_READ:
526 case NFS4_SHARE_ACCESS_WRITE:
528 case NFS4_SHARE_ACCESS_BOTH:
534 /* release all access and file references for a given stateid */
536 release_all_access(struct nfs4_ol_stateid *stp)
540 for (i = 1; i < 4; i++) {
541 if (test_access(i, stp))
542 nfs4_file_put_access(stp->st_file,
543 nfs4_access_to_omode(i));
544 clear_access(i, stp);
548 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
550 list_del(&stp->st_perfile);
551 list_del(&stp->st_perstateowner);
554 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
556 release_all_access(stp);
557 put_nfs4_file(stp->st_file);
561 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
563 kmem_cache_free(stateid_slab, stp);
566 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
570 unhash_generic_stateid(stp);
571 unhash_stid(&stp->st_stid);
572 file = find_any_file(stp->st_file);
574 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
575 close_generic_stateid(stp);
576 free_generic_stateid(stp);
579 static void unhash_lockowner(struct nfs4_lockowner *lo)
581 struct nfs4_ol_stateid *stp;
583 list_del(&lo->lo_owner.so_strhash);
584 list_del(&lo->lo_perstateid);
585 list_del(&lo->lo_owner_ino_hash);
586 while (!list_empty(&lo->lo_owner.so_stateids)) {
587 stp = list_first_entry(&lo->lo_owner.so_stateids,
588 struct nfs4_ol_stateid, st_perstateowner);
589 release_lock_stateid(stp);
593 static void release_lockowner(struct nfs4_lockowner *lo)
595 unhash_lockowner(lo);
596 nfs4_free_lockowner(lo);
600 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
602 struct nfs4_lockowner *lo;
604 while (!list_empty(&open_stp->st_lockowners)) {
605 lo = list_entry(open_stp->st_lockowners.next,
606 struct nfs4_lockowner, lo_perstateid);
607 release_lockowner(lo);
611 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
613 unhash_generic_stateid(stp);
614 release_stateid_lockowners(stp);
615 close_generic_stateid(stp);
618 static void release_open_stateid(struct nfs4_ol_stateid *stp)
620 unhash_open_stateid(stp);
621 unhash_stid(&stp->st_stid);
622 free_generic_stateid(stp);
625 static void unhash_openowner(struct nfs4_openowner *oo)
627 struct nfs4_ol_stateid *stp;
629 list_del(&oo->oo_owner.so_strhash);
630 list_del(&oo->oo_perclient);
631 while (!list_empty(&oo->oo_owner.so_stateids)) {
632 stp = list_first_entry(&oo->oo_owner.so_stateids,
633 struct nfs4_ol_stateid, st_perstateowner);
634 release_open_stateid(stp);
638 static void release_last_closed_stateid(struct nfs4_openowner *oo)
640 struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
643 unhash_stid(&s->st_stid);
644 free_generic_stateid(s);
645 oo->oo_last_closed_stid = NULL;
649 static void release_openowner(struct nfs4_openowner *oo)
651 unhash_openowner(oo);
652 list_del(&oo->oo_close_lru);
653 release_last_closed_stateid(oo);
654 nfs4_free_openowner(oo);
657 #define SESSION_HASH_SIZE 512
658 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
661 hash_sessionid(struct nfs4_sessionid *sessionid)
663 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
665 return sid->sequence % SESSION_HASH_SIZE;
670 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
672 u32 *ptr = (u32 *)(&sessionid->data[0]);
673 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
677 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
684 gen_sessionid(struct nfsd4_session *ses)
686 struct nfs4_client *clp = ses->se_client;
687 struct nfsd4_sessionid *sid;
689 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
690 sid->clientid = clp->cl_clientid;
691 sid->sequence = current_sessionid++;
696 * The protocol defines ca_maxresponssize_cached to include the size of
697 * the rpc header, but all we need to cache is the data starting after
698 * the end of the initial SEQUENCE operation--the rest we regenerate
699 * each time. Therefore we can advertise a ca_maxresponssize_cached
700 * value that is the number of bytes in our cache plus a few additional
701 * bytes. In order to stay on the safe side, and not promise more than
702 * we can cache, those additional bytes must be the minimum possible: 24
703 * bytes of rpc header (xid through accept state, with AUTH_NULL
704 * verifier), 12 for the compound header (with zero-length tag), and 44
705 * for the SEQUENCE op response:
707 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
710 free_session_slots(struct nfsd4_session *ses)
714 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
715 kfree(ses->se_slots[i]);
719 * We don't actually need to cache the rpc and session headers, so we
720 * can allocate a little less for each slot:
722 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
724 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
727 static int nfsd4_sanitize_slot_size(u32 size)
729 size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
730 size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
736 * XXX: If we run out of reserved DRC memory we could (up to a point)
737 * re-negotiate active sessions and reduce their slot usage to make
738 * room for new connections. For now we just fail the create session.
740 static int nfsd4_get_drc_mem(int slotsize, u32 num)
744 num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
746 spin_lock(&nfsd_drc_lock);
747 avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
748 nfsd_drc_max_mem - nfsd_drc_mem_used);
749 num = min_t(int, num, avail / slotsize);
750 nfsd_drc_mem_used += num * slotsize;
751 spin_unlock(&nfsd_drc_lock);
756 static void nfsd4_put_drc_mem(int slotsize, int num)
758 spin_lock(&nfsd_drc_lock);
759 nfsd_drc_mem_used -= slotsize * num;
760 spin_unlock(&nfsd_drc_lock);
763 static struct nfsd4_session *__alloc_session(int slotsize, int numslots)
765 struct nfsd4_session *new;
768 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
769 + sizeof(struct nfsd4_session) > PAGE_SIZE);
770 mem = numslots * sizeof(struct nfsd4_slot *);
772 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
775 /* allocate each struct nfsd4_slot and data cache in one piece */
776 for (i = 0; i < numslots; i++) {
777 mem = sizeof(struct nfsd4_slot) + slotsize;
778 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
779 if (!new->se_slots[i])
785 kfree(new->se_slots[i]);
790 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
792 u32 maxrpc = nfsd_serv->sv_max_mesg;
794 new->maxreqs = numslots;
795 new->maxresp_cached = min_t(u32, req->maxresp_cached,
796 slotsize + NFSD_MIN_HDR_SEQ_SZ);
797 new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
798 new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
799 new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
802 static void free_conn(struct nfsd4_conn *c)
804 svc_xprt_put(c->cn_xprt);
808 static void nfsd4_conn_lost(struct svc_xpt_user *u)
810 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
811 struct nfs4_client *clp = c->cn_session->se_client;
813 spin_lock(&clp->cl_lock);
814 if (!list_empty(&c->cn_persession)) {
815 list_del(&c->cn_persession);
818 spin_unlock(&clp->cl_lock);
819 nfsd4_probe_callback(clp);
822 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
824 struct nfsd4_conn *conn;
826 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
829 svc_xprt_get(rqstp->rq_xprt);
830 conn->cn_xprt = rqstp->rq_xprt;
831 conn->cn_flags = flags;
832 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
836 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
838 conn->cn_session = ses;
839 list_add(&conn->cn_persession, &ses->se_conns);
842 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
844 struct nfs4_client *clp = ses->se_client;
846 spin_lock(&clp->cl_lock);
847 __nfsd4_hash_conn(conn, ses);
848 spin_unlock(&clp->cl_lock);
851 static int nfsd4_register_conn(struct nfsd4_conn *conn)
853 conn->cn_xpt_user.callback = nfsd4_conn_lost;
854 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
857 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
861 nfsd4_hash_conn(conn, ses);
862 ret = nfsd4_register_conn(conn);
864 /* oops; xprt is already down: */
865 nfsd4_conn_lost(&conn->cn_xpt_user);
866 if (conn->cn_flags & NFS4_CDFC4_BACK) {
867 /* callback channel may be back up */
868 nfsd4_probe_callback(ses->se_client);
872 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
874 u32 dir = NFS4_CDFC4_FORE;
876 if (cses->flags & SESSION4_BACK_CHAN)
877 dir |= NFS4_CDFC4_BACK;
878 return alloc_conn(rqstp, dir);
881 /* must be called under client_lock */
882 static void nfsd4_del_conns(struct nfsd4_session *s)
884 struct nfs4_client *clp = s->se_client;
885 struct nfsd4_conn *c;
887 spin_lock(&clp->cl_lock);
888 while (!list_empty(&s->se_conns)) {
889 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
890 list_del_init(&c->cn_persession);
891 spin_unlock(&clp->cl_lock);
893 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
896 spin_lock(&clp->cl_lock);
898 spin_unlock(&clp->cl_lock);
901 static void __free_session(struct nfsd4_session *ses)
903 nfsd4_put_drc_mem(slot_bytes(&ses->se_fchannel), ses->se_fchannel.maxreqs);
904 free_session_slots(ses);
908 static void free_session(struct kref *kref)
910 struct nfsd4_session *ses;
912 lockdep_assert_held(&client_lock);
913 ses = container_of(kref, struct nfsd4_session, se_ref);
914 nfsd4_del_conns(ses);
918 void nfsd4_put_session(struct nfsd4_session *ses)
920 spin_lock(&client_lock);
921 nfsd4_put_session_locked(ses);
922 spin_unlock(&client_lock);
925 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
927 struct nfsd4_session *new;
928 int numslots, slotsize;
930 * Note decreasing slot size below client's request may
931 * make it difficult for client to function correctly, whereas
932 * decreasing the number of slots will (just?) affect
933 * performance. When short on memory we therefore prefer to
934 * decrease number of slots instead of their size.
936 slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
937 numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
941 new = __alloc_session(slotsize, numslots);
943 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
946 init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
950 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
954 new->se_client = clp;
957 INIT_LIST_HEAD(&new->se_conns);
959 new->se_cb_seq_nr = 1;
960 new->se_flags = cses->flags;
961 new->se_cb_prog = cses->callback_prog;
962 new->se_cb_sec = cses->cb_sec;
963 kref_init(&new->se_ref);
964 idx = hash_sessionid(&new->se_sessionid);
965 spin_lock(&client_lock);
966 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
967 spin_lock(&clp->cl_lock);
968 list_add(&new->se_perclnt, &clp->cl_sessions);
969 spin_unlock(&clp->cl_lock);
970 spin_unlock(&client_lock);
972 if (cses->flags & SESSION4_BACK_CHAN) {
973 struct sockaddr *sa = svc_addr(rqstp);
975 * This is a little silly; with sessions there's no real
976 * use for the callback address. Use the peer address
977 * as a reasonable default for now, but consider fixing
978 * the rpc client not to require an address in the
981 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
982 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
986 /* caller must hold client_lock */
987 static struct nfsd4_session *
988 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
990 struct nfsd4_session *elem;
993 dump_sessionid(__func__, sessionid);
994 idx = hash_sessionid(sessionid);
995 /* Search in the appropriate list */
996 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
997 if (!memcmp(elem->se_sessionid.data, sessionid->data,
998 NFS4_MAX_SESSIONID_LEN)) {
1003 dprintk("%s: session not found\n", __func__);
1007 /* caller must hold client_lock */
1009 unhash_session(struct nfsd4_session *ses)
1011 list_del(&ses->se_hash);
1012 spin_lock(&ses->se_client->cl_lock);
1013 list_del(&ses->se_perclnt);
1014 spin_unlock(&ses->se_client->cl_lock);
1017 /* must be called under the client_lock */
1019 renew_client_locked(struct nfs4_client *clp)
1021 if (is_client_expired(clp)) {
1023 printk("%s: client (clientid %08x/%08x) already expired\n",
1025 clp->cl_clientid.cl_boot,
1026 clp->cl_clientid.cl_id);
1030 dprintk("renewing client (clientid %08x/%08x)\n",
1031 clp->cl_clientid.cl_boot,
1032 clp->cl_clientid.cl_id);
1033 list_move_tail(&clp->cl_lru, &client_lru);
1034 clp->cl_time = get_seconds();
1038 renew_client(struct nfs4_client *clp)
1040 spin_lock(&client_lock);
1041 renew_client_locked(clp);
1042 spin_unlock(&client_lock);
1045 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1047 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1049 if (clid->cl_boot == nn->boot_time)
1051 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1052 clid->cl_boot, clid->cl_id, nn->boot_time);
1057 * XXX Should we use a slab cache ?
1058 * This type of memory management is somewhat inefficient, but we use it
1059 * anyway since SETCLIENTID is not a common operation.
1061 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1063 struct nfs4_client *clp;
1065 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1068 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1069 if (clp->cl_name.data == NULL) {
1073 clp->cl_name.len = name.len;
1078 free_client(struct nfs4_client *clp)
1080 lockdep_assert_held(&client_lock);
1081 while (!list_empty(&clp->cl_sessions)) {
1082 struct nfsd4_session *ses;
1083 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1085 list_del(&ses->se_perclnt);
1086 nfsd4_put_session_locked(ses);
1088 free_svc_cred(&clp->cl_cred);
1089 kfree(clp->cl_name.data);
1094 release_session_client(struct nfsd4_session *session)
1096 struct nfs4_client *clp = session->se_client;
1098 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1100 if (is_client_expired(clp)) {
1102 session->se_client = NULL;
1104 renew_client_locked(clp);
1105 spin_unlock(&client_lock);
1108 /* must be called under the client_lock */
1110 unhash_client_locked(struct nfs4_client *clp)
1112 struct nfsd4_session *ses;
1114 mark_client_expired(clp);
1115 list_del(&clp->cl_lru);
1116 spin_lock(&clp->cl_lock);
1117 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1118 list_del_init(&ses->se_hash);
1119 spin_unlock(&clp->cl_lock);
1123 destroy_client(struct nfs4_client *clp)
1125 struct nfs4_openowner *oo;
1126 struct nfs4_delegation *dp;
1127 struct list_head reaplist;
1129 INIT_LIST_HEAD(&reaplist);
1130 spin_lock(&recall_lock);
1131 while (!list_empty(&clp->cl_delegations)) {
1132 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1133 list_del_init(&dp->dl_perclnt);
1134 list_move(&dp->dl_recall_lru, &reaplist);
1136 spin_unlock(&recall_lock);
1137 while (!list_empty(&reaplist)) {
1138 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1139 unhash_delegation(dp);
1141 while (!list_empty(&clp->cl_openowners)) {
1142 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1143 release_openowner(oo);
1145 nfsd4_shutdown_callback(clp);
1146 if (clp->cl_cb_conn.cb_xprt)
1147 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1148 list_del(&clp->cl_idhash);
1149 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1150 rb_erase(&clp->cl_namenode, &conf_name_tree);
1152 rb_erase(&clp->cl_namenode, &unconf_name_tree);
1153 spin_lock(&client_lock);
1154 unhash_client_locked(clp);
1155 if (atomic_read(&clp->cl_refcount) == 0)
1157 spin_unlock(&client_lock);
1160 static void expire_client(struct nfs4_client *clp)
1162 nfsd4_client_record_remove(clp);
1163 destroy_client(clp);
1166 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1168 memcpy(target->cl_verifier.data, source->data,
1169 sizeof(target->cl_verifier.data));
1172 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1174 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1175 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1178 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1180 if (source->cr_principal) {
1181 target->cr_principal =
1182 kstrdup(source->cr_principal, GFP_KERNEL);
1183 if (target->cr_principal == NULL)
1186 target->cr_principal = NULL;
1187 target->cr_flavor = source->cr_flavor;
1188 target->cr_uid = source->cr_uid;
1189 target->cr_gid = source->cr_gid;
1190 target->cr_group_info = source->cr_group_info;
1191 get_group_info(target->cr_group_info);
1196 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1200 res = o1->len - o2->len;
1203 return (long long)memcmp(o1->data, o2->data, o1->len);
1206 static int same_name(const char *n1, const char *n2)
1208 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1212 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1214 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1218 same_clid(clientid_t *cl1, clientid_t *cl2)
1220 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1223 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1227 if (g1->ngroups != g2->ngroups)
1229 for (i=0; i<g1->ngroups; i++)
1230 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1236 * RFC 3530 language requires clid_inuse be returned when the
1237 * "principal" associated with a requests differs from that previously
1238 * used. We use uid, gid's, and gss principal string as our best
1239 * approximation. We also don't want to allow non-gss use of a client
1240 * established using gss: in theory cr_principal should catch that
1241 * change, but in practice cr_principal can be null even in the gss case
1242 * since gssd doesn't always pass down a principal string.
1244 static bool is_gss_cred(struct svc_cred *cr)
1246 /* Is cr_flavor one of the gss "pseudoflavors"?: */
1247 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1252 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1254 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1255 || (cr1->cr_uid != cr2->cr_uid)
1256 || (cr1->cr_gid != cr2->cr_gid)
1257 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1259 if (cr1->cr_principal == cr2->cr_principal)
1261 if (!cr1->cr_principal || !cr2->cr_principal)
1263 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1266 static void gen_clid(struct nfs4_client *clp)
1268 static u32 current_clientid = 1;
1269 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
1271 clp->cl_clientid.cl_boot = nn->boot_time;
1272 clp->cl_clientid.cl_id = current_clientid++;
1275 static void gen_confirm(struct nfs4_client *clp)
1280 verf[0] = (__be32)get_seconds();
1281 verf[1] = (__be32)i++;
1282 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1285 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1287 return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1290 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1292 struct nfs4_stid *s;
1294 s = find_stateid(cl, t);
1297 if (typemask & s->sc_type)
1302 static struct nfs4_client *create_client(struct xdr_netobj name,
1303 struct svc_rqst *rqstp, nfs4_verifier *verf)
1305 struct nfs4_client *clp;
1306 struct sockaddr *sa = svc_addr(rqstp);
1309 clp = alloc_client(name);
1313 INIT_LIST_HEAD(&clp->cl_sessions);
1314 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1316 spin_lock(&client_lock);
1318 spin_unlock(&client_lock);
1321 idr_init(&clp->cl_stateids);
1322 atomic_set(&clp->cl_refcount, 0);
1323 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1324 INIT_LIST_HEAD(&clp->cl_idhash);
1325 INIT_LIST_HEAD(&clp->cl_openowners);
1326 INIT_LIST_HEAD(&clp->cl_delegations);
1327 INIT_LIST_HEAD(&clp->cl_lru);
1328 INIT_LIST_HEAD(&clp->cl_callbacks);
1329 spin_lock_init(&clp->cl_lock);
1330 nfsd4_init_callback(&clp->cl_cb_null);
1331 clp->cl_time = get_seconds();
1332 clear_bit(0, &clp->cl_cb_slot_busy);
1333 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1334 copy_verf(clp, verf);
1335 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1337 clp->cl_cb_session = NULL;
1342 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1344 struct rb_node **new = &(root->rb_node), *parent = NULL;
1345 struct nfs4_client *clp;
1348 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1351 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1352 new = &((*new)->rb_left);
1354 new = &((*new)->rb_right);
1357 rb_link_node(&new_clp->cl_namenode, parent, new);
1358 rb_insert_color(&new_clp->cl_namenode, root);
1361 static struct nfs4_client *
1362 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1365 struct rb_node *node = root->rb_node;
1366 struct nfs4_client *clp;
1369 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1370 cmp = compare_blob(&clp->cl_name, name);
1372 node = node->rb_left;
1374 node = node->rb_right;
1382 add_to_unconfirmed(struct nfs4_client *clp)
1384 unsigned int idhashval;
1386 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1387 add_clp_to_name_tree(clp, &unconf_name_tree);
1388 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1389 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1394 move_to_confirmed(struct nfs4_client *clp)
1396 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1398 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1399 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1400 rb_erase(&clp->cl_namenode, &unconf_name_tree);
1401 add_clp_to_name_tree(clp, &conf_name_tree);
1402 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1406 static struct nfs4_client *
1407 find_confirmed_client(clientid_t *clid, bool sessions)
1409 struct nfs4_client *clp;
1410 unsigned int idhashval = clientid_hashval(clid->cl_id);
1412 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1413 if (same_clid(&clp->cl_clientid, clid)) {
1414 if ((bool)clp->cl_minorversion != sessions)
1423 static struct nfs4_client *
1424 find_unconfirmed_client(clientid_t *clid, bool sessions)
1426 struct nfs4_client *clp;
1427 unsigned int idhashval = clientid_hashval(clid->cl_id);
1429 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1430 if (same_clid(&clp->cl_clientid, clid)) {
1431 if ((bool)clp->cl_minorversion != sessions)
1439 static bool clp_used_exchangeid(struct nfs4_client *clp)
1441 return clp->cl_exchange_flags != 0;
1444 static struct nfs4_client *
1445 find_confirmed_client_by_name(struct xdr_netobj *name)
1447 return find_clp_in_name_tree(name, &conf_name_tree);
1450 static struct nfs4_client *
1451 find_unconfirmed_client_by_name(struct xdr_netobj *name)
1453 return find_clp_in_name_tree(name, &unconf_name_tree);
1457 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1459 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1460 struct sockaddr *sa = svc_addr(rqstp);
1461 u32 scopeid = rpc_get_scope_id(sa);
1462 unsigned short expected_family;
1464 /* Currently, we only support tcp and tcp6 for the callback channel */
1465 if (se->se_callback_netid_len == 3 &&
1466 !memcmp(se->se_callback_netid_val, "tcp", 3))
1467 expected_family = AF_INET;
1468 else if (se->se_callback_netid_len == 4 &&
1469 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1470 expected_family = AF_INET6;
1474 conn->cb_addrlen = rpc_uaddr2sockaddr(&init_net, se->se_callback_addr_val,
1475 se->se_callback_addr_len,
1476 (struct sockaddr *)&conn->cb_addr,
1477 sizeof(conn->cb_addr));
1479 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1482 if (conn->cb_addr.ss_family == AF_INET6)
1483 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1485 conn->cb_prog = se->se_callback_prog;
1486 conn->cb_ident = se->se_callback_ident;
1487 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1490 conn->cb_addr.ss_family = AF_UNSPEC;
1491 conn->cb_addrlen = 0;
1492 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1493 "will not receive delegations\n",
1494 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1500 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1503 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1505 struct nfsd4_slot *slot = resp->cstate.slot;
1508 dprintk("--> %s slot %p\n", __func__, slot);
1510 slot->sl_opcnt = resp->opcnt;
1511 slot->sl_status = resp->cstate.status;
1513 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1514 if (nfsd4_not_cached(resp)) {
1515 slot->sl_datalen = 0;
1518 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1519 base = (char *)resp->cstate.datap -
1520 (char *)resp->xbuf->head[0].iov_base;
1521 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1523 WARN("%s: sessions DRC could not cache compound\n", __func__);
1528 * Encode the replay sequence operation from the slot values.
1529 * If cachethis is FALSE encode the uncached rep error on the next
1530 * operation which sets resp->p and increments resp->opcnt for
1531 * nfs4svc_encode_compoundres.
1535 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1536 struct nfsd4_compoundres *resp)
1538 struct nfsd4_op *op;
1539 struct nfsd4_slot *slot = resp->cstate.slot;
1541 /* Encode the replayed sequence operation */
1542 op = &args->ops[resp->opcnt - 1];
1543 nfsd4_encode_operation(resp, op);
1545 /* Return nfserr_retry_uncached_rep in next operation. */
1546 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1547 op = &args->ops[resp->opcnt++];
1548 op->status = nfserr_retry_uncached_rep;
1549 nfsd4_encode_operation(resp, op);
1555 * The sequence operation is not cached because we can use the slot and
1559 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1560 struct nfsd4_sequence *seq)
1562 struct nfsd4_slot *slot = resp->cstate.slot;
1565 dprintk("--> %s slot %p\n", __func__, slot);
1567 /* Either returns 0 or nfserr_retry_uncached */
1568 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1569 if (status == nfserr_retry_uncached_rep)
1572 /* The sequence operation has been encoded, cstate->datap set. */
1573 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1575 resp->opcnt = slot->sl_opcnt;
1576 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1577 status = slot->sl_status;
1583 * Set the exchange_id flags returned by the server.
1586 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1588 /* pNFS is not supported */
1589 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1591 /* Referrals are supported, Migration is not. */
1592 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1594 /* set the wire flags to return to client. */
1595 clid->flags = new->cl_exchange_flags;
1598 static bool client_has_state(struct nfs4_client *clp)
1601 * Note clp->cl_openowners check isn't quite right: there's no
1602 * need to count owners without stateid's.
1604 * Also note we should probably be using this in 4.0 case too.
1606 return !list_empty(&clp->cl_openowners)
1607 || !list_empty(&clp->cl_delegations)
1608 || !list_empty(&clp->cl_sessions);
1612 nfsd4_exchange_id(struct svc_rqst *rqstp,
1613 struct nfsd4_compound_state *cstate,
1614 struct nfsd4_exchange_id *exid)
1616 struct nfs4_client *unconf, *conf, *new;
1618 char addr_str[INET6_ADDRSTRLEN];
1619 nfs4_verifier verf = exid->verifier;
1620 struct sockaddr *sa = svc_addr(rqstp);
1621 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1623 rpc_ntop(sa, addr_str, sizeof(addr_str));
1624 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1625 "ip_addr=%s flags %x, spa_how %d\n",
1626 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1627 addr_str, exid->flags, exid->spa_how);
1629 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1630 return nfserr_inval;
1632 /* Currently only support SP4_NONE */
1633 switch (exid->spa_how) {
1637 return nfserr_serverfault;
1639 BUG(); /* checked by xdr code */
1641 return nfserr_serverfault; /* no excuse :-/ */
1644 /* Cases below refer to rfc 5661 section 18.35.4: */
1646 conf = find_confirmed_client_by_name(&exid->clname);
1648 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1649 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1652 if (!clp_used_exchangeid(conf)) { /* buggy client */
1653 status = nfserr_inval;
1656 if (!creds_match) { /* case 9 */
1657 status = nfserr_perm;
1660 if (!verfs_match) { /* case 8 */
1661 status = nfserr_not_same;
1665 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1669 if (!creds_match) { /* case 3 */
1670 if (client_has_state(conf)) {
1671 status = nfserr_clid_inuse;
1674 expire_client(conf);
1677 if (verfs_match) { /* case 2 */
1678 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1682 /* case 5, client reboot */
1686 if (update) { /* case 7 */
1687 status = nfserr_noent;
1691 unconf = find_unconfirmed_client_by_name(&exid->clname);
1692 if (unconf) /* case 4, possible retry or client restart */
1693 expire_client(unconf);
1695 /* case 1 (normal case) */
1697 new = create_client(exid->clname, rqstp, &verf);
1699 status = nfserr_jukebox;
1702 new->cl_minorversion = 1;
1705 add_to_unconfirmed(new);
1707 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1708 exid->clientid.cl_id = new->cl_clientid.cl_id;
1710 exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1711 nfsd4_set_ex_flags(new, exid);
1713 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1714 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1718 nfs4_unlock_state();
1723 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1725 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1728 /* The slot is in use, and no response has been sent. */
1730 if (seqid == slot_seqid)
1731 return nfserr_jukebox;
1733 return nfserr_seq_misordered;
1735 /* Note unsigned 32-bit arithmetic handles wraparound: */
1736 if (likely(seqid == slot_seqid + 1))
1738 if (seqid == slot_seqid)
1739 return nfserr_replay_cache;
1740 return nfserr_seq_misordered;
1744 * Cache the create session result into the create session single DRC
1745 * slot cache by saving the xdr structure. sl_seqid has been set.
1746 * Do this for solo or embedded create session operations.
1749 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1750 struct nfsd4_clid_slot *slot, __be32 nfserr)
1752 slot->sl_status = nfserr;
1753 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1757 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1758 struct nfsd4_clid_slot *slot)
1760 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1761 return slot->sl_status;
1764 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1765 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1766 1 + /* MIN tag is length with zero, only length */ \
1767 3 + /* version, opcount, opcode */ \
1768 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1769 /* seqid, slotID, slotID, cache */ \
1770 4 ) * sizeof(__be32))
1772 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1773 2 + /* verifier: AUTH_NULL, length 0 */\
1775 1 + /* MIN tag is length with zero, only length */ \
1776 3 + /* opcount, opcode, opstatus*/ \
1777 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1778 /* seqid, slotID, slotID, slotID, status */ \
1779 5 ) * sizeof(__be32))
1781 static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1783 return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1784 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1788 nfsd4_create_session(struct svc_rqst *rqstp,
1789 struct nfsd4_compound_state *cstate,
1790 struct nfsd4_create_session *cr_ses)
1792 struct sockaddr *sa = svc_addr(rqstp);
1793 struct nfs4_client *conf, *unconf;
1794 struct nfsd4_session *new;
1795 struct nfsd4_conn *conn;
1796 struct nfsd4_clid_slot *cs_slot = NULL;
1799 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1800 return nfserr_inval;
1801 if (check_forechannel_attrs(cr_ses->fore_channel))
1802 return nfserr_toosmall;
1803 new = alloc_session(&cr_ses->fore_channel);
1805 return nfserr_jukebox;
1806 status = nfserr_jukebox;
1807 conn = alloc_conn_from_crses(rqstp, cr_ses);
1809 goto out_free_session;
1812 unconf = find_unconfirmed_client(&cr_ses->clientid, true);
1813 conf = find_confirmed_client(&cr_ses->clientid, true);
1816 cs_slot = &conf->cl_cs_slot;
1817 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1818 if (status == nfserr_replay_cache) {
1819 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1821 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1822 status = nfserr_seq_misordered;
1825 } else if (unconf) {
1826 struct nfs4_client *old;
1827 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1828 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1829 status = nfserr_clid_inuse;
1832 cs_slot = &unconf->cl_cs_slot;
1833 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1835 /* an unconfirmed replay returns misordered */
1836 status = nfserr_seq_misordered;
1839 old = find_confirmed_client_by_name(&unconf->cl_name);
1842 move_to_confirmed(unconf);
1845 status = nfserr_stale_clientid;
1850 * We do not support RDMA or persistent sessions
1852 cr_ses->flags &= ~SESSION4_PERSIST;
1853 cr_ses->flags &= ~SESSION4_RDMA;
1855 init_session(rqstp, new, conf, cr_ses);
1856 nfsd4_init_conn(rqstp, conn, new);
1858 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1859 NFS4_MAX_SESSIONID_LEN);
1860 memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1861 sizeof(struct nfsd4_channel_attrs));
1862 cs_slot->sl_seqid++;
1863 cr_ses->seqid = cs_slot->sl_seqid;
1865 /* cache solo and embedded create sessions under the state lock */
1866 nfsd4_cache_create_session(cr_ses, cs_slot, status);
1868 nfs4_unlock_state();
1869 dprintk("%s returns %d\n", __func__, ntohl(status));
1874 __free_session(new);
1878 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1880 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1881 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1883 return argp->opcnt == resp->opcnt;
1886 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1889 case NFS4_CDFC4_FORE:
1890 case NFS4_CDFC4_BACK:
1892 case NFS4_CDFC4_FORE_OR_BOTH:
1893 case NFS4_CDFC4_BACK_OR_BOTH:
1894 *dir = NFS4_CDFC4_BOTH;
1897 return nfserr_inval;
1900 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
1902 struct nfsd4_session *session = cstate->session;
1904 spin_lock(&client_lock);
1905 session->se_cb_prog = bc->bc_cb_program;
1906 session->se_cb_sec = bc->bc_cb_sec;
1907 spin_unlock(&client_lock);
1909 nfsd4_probe_callback(session->se_client);
1914 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1915 struct nfsd4_compound_state *cstate,
1916 struct nfsd4_bind_conn_to_session *bcts)
1919 struct nfsd4_conn *conn;
1921 if (!nfsd4_last_compound_op(rqstp))
1922 return nfserr_not_only_op;
1923 spin_lock(&client_lock);
1924 cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1925 /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1926 * client_lock iself: */
1927 if (cstate->session) {
1928 nfsd4_get_session(cstate->session);
1929 atomic_inc(&cstate->session->se_client->cl_refcount);
1931 spin_unlock(&client_lock);
1932 if (!cstate->session)
1933 return nfserr_badsession;
1935 status = nfsd4_map_bcts_dir(&bcts->dir);
1938 conn = alloc_conn(rqstp, bcts->dir);
1940 return nfserr_jukebox;
1941 nfsd4_init_conn(rqstp, conn, cstate->session);
1945 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1949 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1953 nfsd4_destroy_session(struct svc_rqst *r,
1954 struct nfsd4_compound_state *cstate,
1955 struct nfsd4_destroy_session *sessionid)
1957 struct nfsd4_session *ses;
1958 __be32 status = nfserr_badsession;
1961 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1962 * - Should we return nfserr_back_chan_busy if waiting for
1963 * callbacks on to-be-destroyed session?
1964 * - Do we need to clear any callback info from previous session?
1967 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1968 if (!nfsd4_last_compound_op(r))
1969 return nfserr_not_only_op;
1971 dump_sessionid(__func__, &sessionid->sessionid);
1972 spin_lock(&client_lock);
1973 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1975 spin_unlock(&client_lock);
1979 unhash_session(ses);
1980 spin_unlock(&client_lock);
1983 nfsd4_probe_callback_sync(ses->se_client);
1984 nfs4_unlock_state();
1986 spin_lock(&client_lock);
1987 nfsd4_del_conns(ses);
1988 nfsd4_put_session_locked(ses);
1989 spin_unlock(&client_lock);
1992 dprintk("%s returns %d\n", __func__, ntohl(status));
1996 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1998 struct nfsd4_conn *c;
2000 list_for_each_entry(c, &s->se_conns, cn_persession) {
2001 if (c->cn_xprt == xpt) {
2008 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2010 struct nfs4_client *clp = ses->se_client;
2011 struct nfsd4_conn *c;
2014 spin_lock(&clp->cl_lock);
2015 c = __nfsd4_find_conn(new->cn_xprt, ses);
2017 spin_unlock(&clp->cl_lock);
2021 __nfsd4_hash_conn(new, ses);
2022 spin_unlock(&clp->cl_lock);
2023 ret = nfsd4_register_conn(new);
2025 /* oops; xprt is already down: */
2026 nfsd4_conn_lost(&new->cn_xpt_user);
2030 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2032 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2034 return args->opcnt > session->se_fchannel.maxops;
2037 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2038 struct nfsd4_session *session)
2040 struct xdr_buf *xb = &rqstp->rq_arg;
2042 return xb->len > session->se_fchannel.maxreq_sz;
2046 nfsd4_sequence(struct svc_rqst *rqstp,
2047 struct nfsd4_compound_state *cstate,
2048 struct nfsd4_sequence *seq)
2050 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2051 struct nfsd4_session *session;
2052 struct nfsd4_slot *slot;
2053 struct nfsd4_conn *conn;
2056 if (resp->opcnt != 1)
2057 return nfserr_sequence_pos;
2060 * Will be either used or freed by nfsd4_sequence_check_conn
2063 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2065 return nfserr_jukebox;
2067 spin_lock(&client_lock);
2068 status = nfserr_badsession;
2069 session = find_in_sessionid_hashtbl(&seq->sessionid);
2073 status = nfserr_too_many_ops;
2074 if (nfsd4_session_too_many_ops(rqstp, session))
2077 status = nfserr_req_too_big;
2078 if (nfsd4_request_too_big(rqstp, session))
2081 status = nfserr_badslot;
2082 if (seq->slotid >= session->se_fchannel.maxreqs)
2085 slot = session->se_slots[seq->slotid];
2086 dprintk("%s: slotid %d\n", __func__, seq->slotid);
2088 /* We do not negotiate the number of slots yet, so set the
2089 * maxslots to the session maxreqs which is used to encode
2090 * sr_highest_slotid and the sr_target_slot id to maxslots */
2091 seq->maxslots = session->se_fchannel.maxreqs;
2093 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2094 slot->sl_flags & NFSD4_SLOT_INUSE);
2095 if (status == nfserr_replay_cache) {
2096 status = nfserr_seq_misordered;
2097 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2099 cstate->slot = slot;
2100 cstate->session = session;
2101 /* Return the cached reply status and set cstate->status
2102 * for nfsd4_proc_compound processing */
2103 status = nfsd4_replay_cache_entry(resp, seq);
2104 cstate->status = nfserr_replay_cache;
2110 nfsd4_sequence_check_conn(conn, session);
2113 /* Success! bump slot seqid */
2114 slot->sl_seqid = seq->seqid;
2115 slot->sl_flags |= NFSD4_SLOT_INUSE;
2117 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2119 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2121 cstate->slot = slot;
2122 cstate->session = session;
2125 /* Hold a session reference until done processing the compound. */
2126 if (cstate->session) {
2127 struct nfs4_client *clp = session->se_client;
2129 nfsd4_get_session(cstate->session);
2130 atomic_inc(&clp->cl_refcount);
2131 switch (clp->cl_cb_state) {
2133 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2135 case NFSD4_CB_FAULT:
2136 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2139 seq->status_flags = 0;
2143 spin_unlock(&client_lock);
2144 dprintk("%s: return %d\n", __func__, ntohl(status));
2149 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2151 struct nfs4_client *conf, *unconf, *clp;
2155 unconf = find_unconfirmed_client(&dc->clientid, true);
2156 conf = find_confirmed_client(&dc->clientid, true);
2161 if (!is_client_expired(conf) && client_has_state(conf)) {
2162 status = nfserr_clientid_busy;
2166 /* rfc5661 18.50.3 */
2167 if (cstate->session && conf == cstate->session->se_client) {
2168 status = nfserr_clientid_busy;
2174 status = nfserr_stale_clientid;
2180 nfs4_unlock_state();
2181 dprintk("%s return %d\n", __func__, ntohl(status));
2186 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2190 if (rc->rca_one_fs) {
2191 if (!cstate->current_fh.fh_dentry)
2192 return nfserr_nofilehandle;
2194 * We don't take advantage of the rca_one_fs case.
2195 * That's OK, it's optional, we can safely ignore it.
2201 status = nfserr_complete_already;
2202 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2203 &cstate->session->se_client->cl_flags))
2206 status = nfserr_stale_clientid;
2207 if (is_client_expired(cstate->session->se_client))
2209 * The following error isn't really legal.
2210 * But we only get here if the client just explicitly
2211 * destroyed the client. Surely it no longer cares what
2212 * error it gets back on an operation for the dead
2218 nfsd4_client_record_create(cstate->session->se_client);
2220 nfs4_unlock_state();
2225 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2226 struct nfsd4_setclientid *setclid)
2228 struct xdr_netobj clname = setclid->se_name;
2229 nfs4_verifier clverifier = setclid->se_verf;
2230 struct nfs4_client *conf, *unconf, *new;
2233 /* Cases below refer to rfc 3530 section 14.2.33: */
2235 conf = find_confirmed_client_by_name(&clname);
2238 status = nfserr_clid_inuse;
2239 if (clp_used_exchangeid(conf))
2241 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2242 char addr_str[INET6_ADDRSTRLEN];
2243 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2245 dprintk("NFSD: setclientid: string in use by client "
2246 "at %s\n", addr_str);
2250 unconf = find_unconfirmed_client_by_name(&clname);
2252 expire_client(unconf);
2253 status = nfserr_jukebox;
2254 new = create_client(clname, rqstp, &clverifier);
2257 if (conf && same_verf(&conf->cl_verifier, &clverifier))
2258 /* case 1: probable callback update */
2259 copy_clid(new, conf);
2260 else /* case 4 (new client) or cases 2, 3 (client reboot): */
2262 new->cl_minorversion = 0;
2263 gen_callback(new, setclid, rqstp);
2264 add_to_unconfirmed(new);
2265 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2266 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2267 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2270 nfs4_unlock_state();
2276 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2277 struct nfsd4_compound_state *cstate,
2278 struct nfsd4_setclientid_confirm *setclientid_confirm)
2280 struct nfs4_client *conf, *unconf;
2281 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2282 clientid_t * clid = &setclientid_confirm->sc_clientid;
2284 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
2286 if (STALE_CLIENTID(clid, nn))
2287 return nfserr_stale_clientid;
2290 conf = find_confirmed_client(clid, false);
2291 unconf = find_unconfirmed_client(clid, false);
2293 * We try hard to give out unique clientid's, so if we get an
2294 * attempt to confirm the same clientid with a different cred,
2295 * there's a bug somewhere. Let's charitably assume it's our
2298 status = nfserr_serverfault;
2299 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2301 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2303 /* cases below refer to rfc 3530 section 14.2.34: */
2304 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2305 if (conf && !unconf) /* case 2: probable retransmit */
2307 else /* case 4: client hasn't noticed we rebooted yet? */
2308 status = nfserr_stale_clientid;
2312 if (conf) { /* case 1: callback update */
2313 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2314 nfsd4_probe_callback(conf);
2315 expire_client(unconf);
2316 } else { /* case 3: normal case; new or rebooted client */
2317 conf = find_confirmed_client_by_name(&unconf->cl_name);
2319 expire_client(conf);
2320 move_to_confirmed(unconf);
2321 nfsd4_probe_callback(unconf);
2324 nfs4_unlock_state();
2328 static struct nfs4_file *nfsd4_alloc_file(void)
2330 return kmem_cache_alloc(file_slab, GFP_KERNEL);
2333 /* OPEN Share state helper functions */
2334 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2336 unsigned int hashval = file_hashval(ino);
2338 atomic_set(&fp->fi_ref, 1);
2339 INIT_LIST_HEAD(&fp->fi_hash);
2340 INIT_LIST_HEAD(&fp->fi_stateids);
2341 INIT_LIST_HEAD(&fp->fi_delegations);
2342 fp->fi_inode = igrab(ino);
2343 fp->fi_had_conflict = false;
2344 fp->fi_lease = NULL;
2345 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2346 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2347 spin_lock(&recall_lock);
2348 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2349 spin_unlock(&recall_lock);
2353 nfsd4_free_slab(struct kmem_cache **slab)
2357 kmem_cache_destroy(*slab);
2362 nfsd4_free_slabs(void)
2364 nfsd4_free_slab(&openowner_slab);
2365 nfsd4_free_slab(&lockowner_slab);
2366 nfsd4_free_slab(&file_slab);
2367 nfsd4_free_slab(&stateid_slab);
2368 nfsd4_free_slab(&deleg_slab);
2372 nfsd4_init_slabs(void)
2374 openowner_slab = kmem_cache_create("nfsd4_openowners",
2375 sizeof(struct nfs4_openowner), 0, 0, NULL);
2376 if (openowner_slab == NULL)
2378 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2379 sizeof(struct nfs4_lockowner), 0, 0, NULL);
2380 if (lockowner_slab == NULL)
2382 file_slab = kmem_cache_create("nfsd4_files",
2383 sizeof(struct nfs4_file), 0, 0, NULL);
2384 if (file_slab == NULL)
2386 stateid_slab = kmem_cache_create("nfsd4_stateids",
2387 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2388 if (stateid_slab == NULL)
2390 deleg_slab = kmem_cache_create("nfsd4_delegations",
2391 sizeof(struct nfs4_delegation), 0, 0, NULL);
2392 if (deleg_slab == NULL)
2397 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2401 void nfs4_free_openowner(struct nfs4_openowner *oo)
2403 kfree(oo->oo_owner.so_owner.data);
2404 kmem_cache_free(openowner_slab, oo);
2407 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2409 kfree(lo->lo_owner.so_owner.data);
2410 kmem_cache_free(lockowner_slab, lo);
2413 static void init_nfs4_replay(struct nfs4_replay *rp)
2415 rp->rp_status = nfserr_serverfault;
2417 rp->rp_buf = rp->rp_ibuf;
2420 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2422 struct nfs4_stateowner *sop;
2424 sop = kmem_cache_alloc(slab, GFP_KERNEL);
2428 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2429 if (!sop->so_owner.data) {
2430 kmem_cache_free(slab, sop);
2433 sop->so_owner.len = owner->len;
2435 INIT_LIST_HEAD(&sop->so_stateids);
2436 sop->so_client = clp;
2437 init_nfs4_replay(&sop->so_replay);
2441 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2443 list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
2444 list_add(&oo->oo_perclient, &clp->cl_openowners);
2447 static struct nfs4_openowner *
2448 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2449 struct nfs4_openowner *oo;
2451 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2454 oo->oo_owner.so_is_open_owner = 1;
2455 oo->oo_owner.so_seqid = open->op_seqid;
2456 oo->oo_flags = NFS4_OO_NEW;
2458 oo->oo_last_closed_stid = NULL;
2459 INIT_LIST_HEAD(&oo->oo_close_lru);
2460 hash_openowner(oo, clp, strhashval);
2464 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2465 struct nfs4_openowner *oo = open->op_openowner;
2466 struct nfs4_client *clp = oo->oo_owner.so_client;
2468 init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2469 INIT_LIST_HEAD(&stp->st_lockowners);
2470 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2471 list_add(&stp->st_perfile, &fp->fi_stateids);
2472 stp->st_stateowner = &oo->oo_owner;
2475 stp->st_access_bmap = 0;
2476 stp->st_deny_bmap = 0;
2477 set_access(open->op_share_access, stp);
2478 set_deny(open->op_share_deny, stp);
2479 stp->st_openstp = NULL;
2483 move_to_close_lru(struct nfs4_openowner *oo)
2485 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2487 list_move_tail(&oo->oo_close_lru, &close_lru);
2488 oo->oo_time = get_seconds();
2492 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2495 return (sop->so_owner.len == owner->len) &&
2496 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2497 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2500 static struct nfs4_openowner *
2501 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, bool sessions)
2503 struct nfs4_stateowner *so;
2504 struct nfs4_openowner *oo;
2505 struct nfs4_client *clp;
2507 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2508 if (!so->so_is_open_owner)
2510 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2512 clp = oo->oo_owner.so_client;
2513 if ((bool)clp->cl_minorversion != sessions)
2515 renew_client(oo->oo_owner.so_client);
2522 /* search file_hashtbl[] for file */
2523 static struct nfs4_file *
2524 find_file(struct inode *ino)
2526 unsigned int hashval = file_hashval(ino);
2527 struct nfs4_file *fp;
2529 spin_lock(&recall_lock);
2530 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2531 if (fp->fi_inode == ino) {
2533 spin_unlock(&recall_lock);
2537 spin_unlock(&recall_lock);
2542 * Called to check deny when READ with all zero stateid or
2543 * WRITE with all zero or all one stateid
2546 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2548 struct inode *ino = current_fh->fh_dentry->d_inode;
2549 struct nfs4_file *fp;
2550 struct nfs4_ol_stateid *stp;
2553 dprintk("NFSD: nfs4_share_conflict\n");
2555 fp = find_file(ino);
2558 ret = nfserr_locked;
2559 /* Search for conflicting share reservations */
2560 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2561 if (test_deny(deny_type, stp) ||
2562 test_deny(NFS4_SHARE_DENY_BOTH, stp))
2571 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2573 /* We're assuming the state code never drops its reference
2574 * without first removing the lease. Since we're in this lease
2575 * callback (and since the lease code is serialized by the kernel
2576 * lock) we know the server hasn't removed the lease yet, we know
2577 * it's safe to take a reference: */
2578 atomic_inc(&dp->dl_count);
2580 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2582 /* only place dl_time is set. protected by lock_flocks*/
2583 dp->dl_time = get_seconds();
2585 nfsd4_cb_recall(dp);
2588 /* Called from break_lease() with lock_flocks() held. */
2589 static void nfsd_break_deleg_cb(struct file_lock *fl)
2591 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2592 struct nfs4_delegation *dp;
2595 WARN(1, "(%p)->fl_owner NULL\n", fl);
2598 if (fp->fi_had_conflict) {
2599 WARN(1, "duplicate break on %p\n", fp);
2603 * We don't want the locks code to timeout the lease for us;
2604 * we'll remove it ourself if a delegation isn't returned
2607 fl->fl_break_time = 0;
2609 spin_lock(&recall_lock);
2610 fp->fi_had_conflict = true;
2611 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2612 nfsd_break_one_deleg(dp);
2613 spin_unlock(&recall_lock);
2617 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2620 return lease_modify(onlist, arg);
2625 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2626 .lm_break = nfsd_break_deleg_cb,
2627 .lm_change = nfsd_change_deleg_cb,
2630 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2632 if (nfsd4_has_session(cstate))
2634 if (seqid == so->so_seqid - 1)
2635 return nfserr_replay_me;
2636 if (seqid == so->so_seqid)
2638 return nfserr_bad_seqid;
2642 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2643 struct nfsd4_open *open)
2645 clientid_t *clientid = &open->op_clientid;
2646 struct nfs4_client *clp = NULL;
2647 unsigned int strhashval;
2648 struct nfs4_openowner *oo = NULL;
2650 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
2652 if (STALE_CLIENTID(&open->op_clientid, nn))
2653 return nfserr_stale_clientid;
2655 * In case we need it later, after we've already created the
2656 * file and don't want to risk a further failure:
2658 open->op_file = nfsd4_alloc_file();
2659 if (open->op_file == NULL)
2660 return nfserr_jukebox;
2662 strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2663 oo = find_openstateowner_str(strhashval, open, cstate->minorversion);
2664 open->op_openowner = oo;
2666 clp = find_confirmed_client(clientid, cstate->minorversion);
2668 return nfserr_expired;
2671 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2672 /* Replace unconfirmed owners without checking for replay. */
2673 clp = oo->oo_owner.so_client;
2674 release_openowner(oo);
2675 open->op_openowner = NULL;
2678 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2681 clp = oo->oo_owner.so_client;
2684 oo = alloc_init_open_stateowner(strhashval, clp, open);
2686 return nfserr_jukebox;
2687 open->op_openowner = oo;
2689 open->op_stp = nfs4_alloc_stateid(clp);
2691 return nfserr_jukebox;
2695 static inline __be32
2696 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2698 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2699 return nfserr_openmode;
2704 static int share_access_to_flags(u32 share_access)
2706 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2709 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2711 struct nfs4_stid *ret;
2713 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2716 return delegstateid(ret);
2719 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2721 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2722 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2726 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2727 struct nfs4_delegation **dp)
2730 __be32 status = nfserr_bad_stateid;
2732 *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2735 flags = share_access_to_flags(open->op_share_access);
2736 status = nfs4_check_delegmode(*dp, flags);
2740 if (!nfsd4_is_deleg_cur(open))
2744 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2749 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2751 struct nfs4_ol_stateid *local;
2752 struct nfs4_openowner *oo = open->op_openowner;
2754 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2755 /* ignore lock owners */
2756 if (local->st_stateowner->so_is_open_owner == 0)
2758 /* remember if we have seen this open owner */
2759 if (local->st_stateowner == &oo->oo_owner)
2761 /* check for conflicting share reservations */
2762 if (!test_share(local, open))
2763 return nfserr_share_denied;
2768 static inline int nfs4_access_to_access(u32 nfs4_access)
2772 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2773 flags |= NFSD_MAY_READ;
2774 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2775 flags |= NFSD_MAY_WRITE;
2779 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2780 struct svc_fh *cur_fh, struct nfsd4_open *open)
2783 int oflag = nfs4_access_to_omode(open->op_share_access);
2784 int access = nfs4_access_to_access(open->op_share_access);
2786 if (!fp->fi_fds[oflag]) {
2787 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2788 &fp->fi_fds[oflag]);
2792 nfs4_file_get_access(fp, oflag);
2797 static inline __be32
2798 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2799 struct nfsd4_open *open)
2801 struct iattr iattr = {
2802 .ia_valid = ATTR_SIZE,
2805 if (!open->op_truncate)
2807 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2808 return nfserr_inval;
2809 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2813 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)
2815 u32 op_share_access = open->op_share_access;
2819 new_access = !test_access(op_share_access, stp);
2821 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2825 status = nfsd4_truncate(rqstp, cur_fh, open);
2828 int oflag = nfs4_access_to_omode(op_share_access);
2829 nfs4_file_put_access(fp, oflag);
2833 /* remember the open */
2834 set_access(op_share_access, stp);
2835 set_deny(open->op_share_deny, stp);
2842 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2844 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2847 /* Should we give out recallable state?: */
2848 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2850 if (clp->cl_cb_state == NFSD4_CB_UP)
2853 * In the sessions case, since we don't have to establish a
2854 * separate connection for callbacks, we assume it's OK
2855 * until we hear otherwise:
2857 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2860 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2862 struct file_lock *fl;
2864 fl = locks_alloc_lock();
2867 locks_init_lock(fl);
2868 fl->fl_lmops = &nfsd_lease_mng_ops;
2869 fl->fl_flags = FL_LEASE;
2870 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2871 fl->fl_end = OFFSET_MAX;
2872 fl->fl_owner = (fl_owner_t)(dp->dl_file);
2873 fl->fl_pid = current->tgid;
2877 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2879 struct nfs4_file *fp = dp->dl_file;
2880 struct file_lock *fl;
2883 fl = nfs4_alloc_init_lease(dp, flag);
2886 fl->fl_file = find_readable_file(fp);
2887 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2888 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2890 list_del_init(&dp->dl_perclnt);
2891 locks_free_lock(fl);
2895 fp->fi_deleg_file = get_file(fl->fl_file);
2896 atomic_set(&fp->fi_delegees, 1);
2897 list_add(&dp->dl_perfile, &fp->fi_delegations);
2901 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2903 struct nfs4_file *fp = dp->dl_file;
2906 return nfs4_setlease(dp, flag);
2907 spin_lock(&recall_lock);
2908 if (fp->fi_had_conflict) {
2909 spin_unlock(&recall_lock);
2912 atomic_inc(&fp->fi_delegees);
2913 list_add(&dp->dl_perfile, &fp->fi_delegations);
2914 spin_unlock(&recall_lock);
2915 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2919 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2921 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2922 if (status == -EAGAIN)
2923 open->op_why_no_deleg = WND4_CONTENTION;
2925 open->op_why_no_deleg = WND4_RESOURCE;
2926 switch (open->op_deleg_want) {
2927 case NFS4_SHARE_WANT_READ_DELEG:
2928 case NFS4_SHARE_WANT_WRITE_DELEG:
2929 case NFS4_SHARE_WANT_ANY_DELEG:
2931 case NFS4_SHARE_WANT_CANCEL:
2932 open->op_why_no_deleg = WND4_CANCELLED;
2934 case NFS4_SHARE_WANT_NO_DELEG:
2935 BUG(); /* not supposed to get here */
2941 * Attempt to hand out a delegation.
2944 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
2945 struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2947 struct nfs4_delegation *dp;
2948 struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2950 int status = 0, flag = 0;
2952 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2953 flag = NFS4_OPEN_DELEGATE_NONE;
2954 open->op_recall = 0;
2955 switch (open->op_claim_type) {
2956 case NFS4_OPEN_CLAIM_PREVIOUS:
2958 open->op_recall = 1;
2959 flag = open->op_delegate_type;
2960 if (flag == NFS4_OPEN_DELEGATE_NONE)
2963 case NFS4_OPEN_CLAIM_NULL:
2964 /* Let's not give out any delegations till everyone's
2965 * had the chance to reclaim theirs.... */
2966 if (locks_in_grace(net))
2968 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2970 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2971 flag = NFS4_OPEN_DELEGATE_WRITE;
2973 flag = NFS4_OPEN_DELEGATE_READ;
2979 dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2982 status = nfs4_set_delegation(dp, flag);
2986 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2988 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2989 STATEID_VAL(&dp->dl_stid.sc_stateid));
2991 open->op_delegate_type = flag;
2992 if (flag == NFS4_OPEN_DELEGATE_NONE) {
2993 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2994 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2995 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2997 /* 4.1 client asking for a delegation? */
2998 if (open->op_deleg_want)
2999 nfsd4_open_deleg_none_ext(open, status);
3003 nfs4_put_delegation(dp);
3005 flag = NFS4_OPEN_DELEGATE_NONE;
3009 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3010 struct nfs4_delegation *dp)
3012 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3013 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3014 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3015 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3016 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3017 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3018 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3019 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3021 /* Otherwise the client must be confused wanting a delegation
3022 * it already has, therefore we don't return
3023 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3028 * called with nfs4_lock_state() held.
3031 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3033 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3034 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3035 struct nfs4_file *fp = NULL;
3036 struct inode *ino = current_fh->fh_dentry->d_inode;
3037 struct nfs4_ol_stateid *stp = NULL;
3038 struct nfs4_delegation *dp = NULL;
3042 * Lookup file; if found, lookup stateid and check open request,
3043 * and check for delegations in the process of being recalled.
3044 * If not found, create the nfs4_file struct
3046 fp = find_file(ino);
3048 if ((status = nfs4_check_open(fp, open, &stp)))
3050 status = nfs4_check_deleg(cl, fp, open, &dp);
3054 status = nfserr_bad_stateid;
3055 if (nfsd4_is_deleg_cur(open))
3057 status = nfserr_jukebox;
3059 open->op_file = NULL;
3060 nfsd4_init_file(fp, ino);
3064 * OPEN the file, or upgrade an existing OPEN.
3065 * If truncate fails, the OPEN fails.
3068 /* Stateid was found, this is an OPEN upgrade */
3069 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3073 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3076 status = nfsd4_truncate(rqstp, current_fh, open);
3080 open->op_stp = NULL;
3081 init_open_stateid(stp, fp, open);
3083 update_stateid(&stp->st_stid.sc_stateid);
3084 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3086 if (nfsd4_has_session(&resp->cstate)) {
3087 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3089 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3090 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3091 open->op_why_no_deleg = WND4_NOT_WANTED;
3097 * Attempt to hand out a delegation. No error return, because the
3098 * OPEN succeeds even if we fail.
3100 nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3104 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3105 STATEID_VAL(&stp->st_stid.sc_stateid));
3107 /* 4.1 client trying to upgrade/downgrade delegation? */
3108 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3109 open->op_deleg_want)
3110 nfsd4_deleg_xgrade_none_ext(open, dp);
3114 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3115 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3117 * To finish the open response, we just need to set the rflags.
3119 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3120 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3121 !nfsd4_has_session(&resp->cstate))
3122 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3127 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3129 if (open->op_openowner) {
3130 struct nfs4_openowner *oo = open->op_openowner;
3132 if (!list_empty(&oo->oo_owner.so_stateids))
3133 list_del_init(&oo->oo_close_lru);
3134 if (oo->oo_flags & NFS4_OO_NEW) {
3136 release_openowner(oo);
3137 open->op_openowner = NULL;
3139 oo->oo_flags &= ~NFS4_OO_NEW;
3143 nfsd4_free_file(open->op_file);
3145 free_generic_stateid(open->op_stp);
3149 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3152 struct nfs4_client *clp;
3154 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
3157 dprintk("process_renew(%08x/%08x): starting\n",
3158 clid->cl_boot, clid->cl_id);
3159 status = nfserr_stale_clientid;
3160 if (STALE_CLIENTID(clid, nn))
3162 clp = find_confirmed_client(clid, cstate->minorversion);
3163 status = nfserr_expired;
3165 /* We assume the client took too long to RENEW. */
3166 dprintk("nfsd4_renew: clientid not found!\n");
3169 status = nfserr_cb_path_down;
3170 if (!list_empty(&clp->cl_delegations)
3171 && clp->cl_cb_state != NFSD4_CB_UP)
3175 nfs4_unlock_state();
3180 nfsd4_end_grace(struct net *net)
3182 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3184 /* do nothing if grace period already ended */
3185 if (nn->grace_ended)
3188 dprintk("NFSD: end of grace period\n");
3189 nn->grace_ended = true;
3190 nfsd4_record_grace_done(net, nn->boot_time);
3191 locks_end_grace(&nn->nfsd4_manager);
3193 * Now that every NFSv4 client has had the chance to recover and
3194 * to see the (possibly new, possibly shorter) lease time, we
3195 * can safely set the next grace time to the current lease time:
3197 nfsd4_grace = nfsd4_lease;
3201 nfs4_laundromat(void)
3203 struct nfs4_client *clp;
3204 struct nfs4_openowner *oo;
3205 struct nfs4_delegation *dp;
3206 struct list_head *pos, *next, reaplist;
3207 time_t cutoff = get_seconds() - nfsd4_lease;
3208 time_t t, clientid_val = nfsd4_lease;
3209 time_t u, test_val = nfsd4_lease;
3213 dprintk("NFSD: laundromat service - starting\n");
3214 nfsd4_end_grace(&init_net);
3215 INIT_LIST_HEAD(&reaplist);
3216 spin_lock(&client_lock);
3217 list_for_each_safe(pos, next, &client_lru) {
3218 clp = list_entry(pos, struct nfs4_client, cl_lru);
3219 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3220 t = clp->cl_time - cutoff;
3221 if (clientid_val > t)
3225 if (atomic_read(&clp->cl_refcount)) {
3226 dprintk("NFSD: client in use (clientid %08x)\n",
3227 clp->cl_clientid.cl_id);
3230 unhash_client_locked(clp);
3231 list_add(&clp->cl_lru, &reaplist);
3233 spin_unlock(&client_lock);
3234 list_for_each_safe(pos, next, &reaplist) {
3235 clp = list_entry(pos, struct nfs4_client, cl_lru);
3236 dprintk("NFSD: purging unused client (clientid %08x)\n",
3237 clp->cl_clientid.cl_id);
3240 spin_lock(&recall_lock);
3241 list_for_each_safe(pos, next, &del_recall_lru) {
3242 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3243 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3244 u = dp->dl_time - cutoff;
3249 list_move(&dp->dl_recall_lru, &reaplist);
3251 spin_unlock(&recall_lock);
3252 list_for_each_safe(pos, next, &reaplist) {
3253 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3254 unhash_delegation(dp);
3256 test_val = nfsd4_lease;
3257 list_for_each_safe(pos, next, &close_lru) {
3258 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3259 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3260 u = oo->oo_time - cutoff;
3265 release_openowner(oo);
3267 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3268 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3269 nfs4_unlock_state();
3270 return clientid_val;
3273 static struct workqueue_struct *laundry_wq;
3274 static void laundromat_main(struct work_struct *);
3275 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3278 laundromat_main(struct work_struct *not_used)
3282 t = nfs4_laundromat();
3283 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3284 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3287 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3289 if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3290 return nfserr_bad_stateid;
3295 STALE_STATEID(stateid_t *stateid, struct nfsd_net *nn)
3297 if (stateid->si_opaque.so_clid.cl_boot == nn->boot_time)
3299 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3300 STATEID_VAL(stateid));
3305 access_permit_read(struct nfs4_ol_stateid *stp)
3307 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3308 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3309 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3313 access_permit_write(struct nfs4_ol_stateid *stp)
3315 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3316 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3320 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3322 __be32 status = nfserr_openmode;
3324 /* For lock stateid's, we test the parent open, not the lock: */
3325 if (stp->st_openstp)
3326 stp = stp->st_openstp;
3327 if ((flags & WR_STATE) && !access_permit_write(stp))
3329 if ((flags & RD_STATE) && !access_permit_read(stp))
3336 static inline __be32
3337 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3339 if (ONE_STATEID(stateid) && (flags & RD_STATE))
3341 else if (locks_in_grace(net)) {
3342 /* Answer in remaining cases depends on existence of
3343 * conflicting state; so we must wait out the grace period. */
3344 return nfserr_grace;
3345 } else if (flags & WR_STATE)
3346 return nfs4_share_conflict(current_fh,
3347 NFS4_SHARE_DENY_WRITE);
3348 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3349 return nfs4_share_conflict(current_fh,
3350 NFS4_SHARE_DENY_READ);
3354 * Allow READ/WRITE during grace period on recovered state only for files
3355 * that are not able to provide mandatory locking.
3358 grace_disallows_io(struct net *net, struct inode *inode)
3360 return locks_in_grace(net) && mandatory_lock(inode);
3363 /* Returns true iff a is later than b: */
3364 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3366 return (s32)a->si_generation - (s32)b->si_generation > 0;
3369 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3372 * When sessions are used the stateid generation number is ignored
3375 if (has_session && in->si_generation == 0)
3378 if (in->si_generation == ref->si_generation)
3381 /* If the client sends us a stateid from the future, it's buggy: */
3382 if (stateid_generation_after(in, ref))
3383 return nfserr_bad_stateid;
3385 * However, we could see a stateid from the past, even from a
3386 * non-buggy client. For example, if the client sends a lock
3387 * while some IO is outstanding, the lock may bump si_generation
3388 * while the IO is still in flight. The client could avoid that
3389 * situation by waiting for responses on all the IO requests,
3390 * but better performance may result in retrying IO that
3391 * receives an old_stateid error if requests are rarely
3392 * reordered in flight:
3394 return nfserr_old_stateid;
3397 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3399 struct nfs4_stid *s;
3400 struct nfs4_ol_stateid *ols;
3403 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3404 return nfserr_bad_stateid;
3405 /* Client debugging aid. */
3406 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3407 char addr_str[INET6_ADDRSTRLEN];
3408 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3410 pr_warn_ratelimited("NFSD: client %s testing state ID "
3411 "with incorrect client ID\n", addr_str);
3412 return nfserr_bad_stateid;
3414 s = find_stateid(cl, stateid);
3416 return nfserr_bad_stateid;
3417 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3420 if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3422 ols = openlockstateid(s);
3423 if (ols->st_stateowner->so_is_open_owner
3424 && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3425 return nfserr_bad_stateid;
3429 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s, bool sessions)
3431 struct nfs4_client *cl;
3432 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
3434 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3435 return nfserr_bad_stateid;
3436 if (STALE_STATEID(stateid, nn))
3437 return nfserr_stale_stateid;
3438 cl = find_confirmed_client(&stateid->si_opaque.so_clid, sessions);
3440 return nfserr_expired;
3441 *s = find_stateid_by_type(cl, stateid, typemask);
3443 return nfserr_bad_stateid;
3449 * Checks for stateid operations
3452 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3453 stateid_t *stateid, int flags, struct file **filpp)
3455 struct nfs4_stid *s;
3456 struct nfs4_ol_stateid *stp = NULL;
3457 struct nfs4_delegation *dp = NULL;
3458 struct svc_fh *current_fh = &cstate->current_fh;
3459 struct inode *ino = current_fh->fh_dentry->d_inode;
3465 if (grace_disallows_io(net, ino))
3466 return nfserr_grace;
3468 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3469 return check_special_stateids(net, current_fh, stateid, flags);
3471 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s, cstate->minorversion);
3474 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3477 switch (s->sc_type) {
3478 case NFS4_DELEG_STID:
3479 dp = delegstateid(s);
3480 status = nfs4_check_delegmode(dp, flags);
3484 *filpp = dp->dl_file->fi_deleg_file;
3488 case NFS4_OPEN_STID:
3489 case NFS4_LOCK_STID:
3490 stp = openlockstateid(s);
3491 status = nfs4_check_fh(current_fh, stp);
3494 if (stp->st_stateowner->so_is_open_owner
3495 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3497 status = nfs4_check_openmode(stp, flags);
3501 if (flags & RD_STATE)
3502 *filpp = find_readable_file(stp->st_file);
3504 *filpp = find_writeable_file(stp->st_file);
3508 return nfserr_bad_stateid;
3516 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3518 if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3519 return nfserr_locks_held;
3520 release_lock_stateid(stp);
3525 * Test if the stateid is valid
3528 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3529 struct nfsd4_test_stateid *test_stateid)
3531 struct nfsd4_test_stateid_id *stateid;
3532 struct nfs4_client *cl = cstate->session->se_client;
3535 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3536 stateid->ts_id_status =
3537 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3538 nfs4_unlock_state();
3544 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3545 struct nfsd4_free_stateid *free_stateid)
3547 stateid_t *stateid = &free_stateid->fr_stateid;
3548 struct nfs4_stid *s;
3549 struct nfs4_client *cl = cstate->session->se_client;
3550 __be32 ret = nfserr_bad_stateid;
3553 s = find_stateid(cl, stateid);
3556 switch (s->sc_type) {
3557 case NFS4_DELEG_STID:
3558 ret = nfserr_locks_held;
3560 case NFS4_OPEN_STID:
3561 case NFS4_LOCK_STID:
3562 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3565 if (s->sc_type == NFS4_LOCK_STID)
3566 ret = nfsd4_free_lock_stateid(openlockstateid(s));
3568 ret = nfserr_locks_held;
3571 ret = nfserr_bad_stateid;
3574 nfs4_unlock_state();
3581 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3582 RD_STATE : WR_STATE;
3585 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3587 struct svc_fh *current_fh = &cstate->current_fh;
3588 struct nfs4_stateowner *sop = stp->st_stateowner;
3591 status = nfsd4_check_seqid(cstate, sop, seqid);
3594 if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3596 * "Closed" stateid's exist *only* to return
3597 * nfserr_replay_me from the previous step.
3599 return nfserr_bad_stateid;
3600 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3603 return nfs4_check_fh(current_fh, stp);
3607 * Checks for sequence id mutating operations.
3610 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3611 stateid_t *stateid, char typemask,
3612 struct nfs4_ol_stateid **stpp)
3615 struct nfs4_stid *s;
3617 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3618 seqid, STATEID_VAL(stateid));
3621 status = nfsd4_lookup_stateid(stateid, typemask, &s, cstate->minorversion);
3624 *stpp = openlockstateid(s);
3625 cstate->replay_owner = (*stpp)->st_stateowner;
3627 return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3630 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
3633 struct nfs4_openowner *oo;
3635 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3636 NFS4_OPEN_STID, stpp);
3639 oo = openowner((*stpp)->st_stateowner);
3640 if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3641 return nfserr_bad_stateid;
3646 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3647 struct nfsd4_open_confirm *oc)
3650 struct nfs4_openowner *oo;
3651 struct nfs4_ol_stateid *stp;
3653 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3654 (int)cstate->current_fh.fh_dentry->d_name.len,
3655 cstate->current_fh.fh_dentry->d_name.name);
3657 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3663 status = nfs4_preprocess_seqid_op(cstate,
3664 oc->oc_seqid, &oc->oc_req_stateid,
3665 NFS4_OPEN_STID, &stp);
3668 oo = openowner(stp->st_stateowner);
3669 status = nfserr_bad_stateid;
3670 if (oo->oo_flags & NFS4_OO_CONFIRMED)
3672 oo->oo_flags |= NFS4_OO_CONFIRMED;
3673 update_stateid(&stp->st_stid.sc_stateid);
3674 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3675 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3676 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3678 nfsd4_client_record_create(oo->oo_owner.so_client);
3681 if (!cstate->replay_owner)
3682 nfs4_unlock_state();
3686 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3688 if (!test_access(access, stp))
3690 nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3691 clear_access(access, stp);
3694 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3696 switch (to_access) {
3697 case NFS4_SHARE_ACCESS_READ:
3698 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3699 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3701 case NFS4_SHARE_ACCESS_WRITE:
3702 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3703 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3705 case NFS4_SHARE_ACCESS_BOTH:
3713 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3716 for (i = 0; i < 4; i++) {
3717 if ((i & deny) != i)
3723 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3724 struct nfsd4_compound_state *cstate,
3725 struct nfsd4_open_downgrade *od)
3728 struct nfs4_ol_stateid *stp;
3730 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3731 (int)cstate->current_fh.fh_dentry->d_name.len,
3732 cstate->current_fh.fh_dentry->d_name.name);
3734 /* We don't yet support WANT bits: */
3735 if (od->od_deleg_want)
3736 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3740 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3741 &od->od_stateid, &stp);
3744 status = nfserr_inval;
3745 if (!test_access(od->od_share_access, stp)) {
3746 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3747 stp->st_access_bmap, od->od_share_access);
3750 if (!test_deny(od->od_share_deny, stp)) {
3751 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3752 stp->st_deny_bmap, od->od_share_deny);
3755 nfs4_stateid_downgrade(stp, od->od_share_access);
3757 reset_union_bmap_deny(od->od_share_deny, stp);
3759 update_stateid(&stp->st_stid.sc_stateid);
3760 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3763 if (!cstate->replay_owner)
3764 nfs4_unlock_state();
3768 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3770 struct nfs4_openowner *oo;
3771 struct nfs4_ol_stateid *s;
3773 if (!so->so_is_open_owner)
3776 s = oo->oo_last_closed_stid;
3779 if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3780 /* Release the last_closed_stid on the next seqid bump: */
3781 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3784 oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3785 release_last_closed_stateid(oo);
3788 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3790 unhash_open_stateid(s);
3791 s->st_stid.sc_type = NFS4_CLOSED_STID;
3795 * nfs4_unlock_state() called after encode
3798 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3799 struct nfsd4_close *close)
3802 struct nfs4_openowner *oo;
3803 struct nfs4_ol_stateid *stp;
3805 dprintk("NFSD: nfsd4_close on file %.*s\n",
3806 (int)cstate->current_fh.fh_dentry->d_name.len,
3807 cstate->current_fh.fh_dentry->d_name.name);
3810 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3812 NFS4_OPEN_STID|NFS4_CLOSED_STID,
3816 oo = openowner(stp->st_stateowner);
3818 update_stateid(&stp->st_stid.sc_stateid);
3819 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3821 nfsd4_close_open_stateid(stp);
3822 release_last_closed_stateid(oo);
3823 oo->oo_last_closed_stid = stp;
3825 if (list_empty(&oo->oo_owner.so_stateids)) {
3826 if (cstate->minorversion) {
3827 release_openowner(oo);
3828 cstate->replay_owner = NULL;
3831 * In the 4.0 case we need to keep the owners around a
3832 * little while to handle CLOSE replay.
3834 if (list_empty(&oo->oo_owner.so_stateids))
3835 move_to_close_lru(oo);
3839 if (!cstate->replay_owner)
3840 nfs4_unlock_state();
3845 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3846 struct nfsd4_delegreturn *dr)
3848 struct nfs4_delegation *dp;
3849 stateid_t *stateid = &dr->dr_stateid;
3850 struct nfs4_stid *s;
3853 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3857 status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s, cstate->minorversion);
3860 dp = delegstateid(s);
3861 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3865 unhash_delegation(dp);
3867 nfs4_unlock_state();
3873 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3875 #define LOCKOWNER_INO_HASH_BITS 8
3876 #define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
3877 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3880 end_offset(u64 start, u64 len)
3885 return end >= start ? end: NFS4_MAX_UINT64;
3888 /* last octet in a range */
3890 last_byte_offset(u64 start, u64 len)
3896 return end > start ? end - 1: NFS4_MAX_UINT64;
3899 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
3901 return (file_hashval(inode) + cl_id
3902 + opaque_hashval(ownername->data, ownername->len))
3903 & LOCKOWNER_INO_HASH_MASK;
3906 static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
3909 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3910 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3911 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3912 * locking, this prevents us from being completely protocol-compliant. The
3913 * real solution to this problem is to start using unsigned file offsets in
3914 * the VFS, but this is a very deep change!
3917 nfs4_transform_lock_offset(struct file_lock *lock)
3919 if (lock->fl_start < 0)
3920 lock->fl_start = OFFSET_MAX;
3921 if (lock->fl_end < 0)
3922 lock->fl_end = OFFSET_MAX;
3925 /* Hack!: For now, we're defining this just so we can use a pointer to it
3926 * as a unique cookie to identify our (NFSv4's) posix locks. */
3927 static const struct lock_manager_operations nfsd_posix_mng_ops = {
3931 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3933 struct nfs4_lockowner *lo;
3935 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3936 lo = (struct nfs4_lockowner *) fl->fl_owner;
3937 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3938 lo->lo_owner.so_owner.len, GFP_KERNEL);
3939 if (!deny->ld_owner.data)
3940 /* We just don't care that much */
3942 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3943 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3946 deny->ld_owner.len = 0;
3947 deny->ld_owner.data = NULL;
3948 deny->ld_clientid.cl_boot = 0;
3949 deny->ld_clientid.cl_id = 0;
3951 deny->ld_start = fl->fl_start;
3952 deny->ld_length = NFS4_MAX_UINT64;
3953 if (fl->fl_end != NFS4_MAX_UINT64)
3954 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3955 deny->ld_type = NFS4_READ_LT;
3956 if (fl->fl_type != F_RDLCK)
3957 deny->ld_type = NFS4_WRITE_LT;
3960 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3962 struct nfs4_ol_stateid *lst;
3964 if (!same_owner_str(&lo->lo_owner, owner, clid))
3966 lst = list_first_entry(&lo->lo_owner.so_stateids,
3967 struct nfs4_ol_stateid, st_perstateowner);
3968 return lst->st_file->fi_inode == inode;
3971 static struct nfs4_lockowner *
3972 find_lockowner_str(struct inode *inode, clientid_t *clid,
3973 struct xdr_netobj *owner)
3975 unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
3976 struct nfs4_lockowner *lo;
3978 list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
3979 if (same_lockowner_ino(lo, inode, clid, owner))
3985 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3987 struct inode *inode = open_stp->st_file->fi_inode;
3988 unsigned int inohash = lockowner_ino_hashval(inode,
3989 clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3991 list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
3992 list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
3993 list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3997 * Alloc a lock owner structure.
3998 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
4001 * strhashval = ownerstr_hashval
4004 static struct nfs4_lockowner *
4005 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4006 struct nfs4_lockowner *lo;
4008 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4011 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4012 lo->lo_owner.so_is_open_owner = 0;
4013 /* It is the openowner seqid that will be incremented in encode in the
4014 * case of new lockowners; so increment the lock seqid manually: */
4015 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4016 hash_lockowner(lo, strhashval, clp, open_stp);
4020 static struct nfs4_ol_stateid *
4021 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4023 struct nfs4_ol_stateid *stp;
4024 struct nfs4_client *clp = lo->lo_owner.so_client;
4026 stp = nfs4_alloc_stateid(clp);
4029 init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
4030 list_add(&stp->st_perfile, &fp->fi_stateids);
4031 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4032 stp->st_stateowner = &lo->lo_owner;
4035 stp->st_access_bmap = 0;
4036 stp->st_deny_bmap = open_stp->st_deny_bmap;
4037 stp->st_openstp = open_stp;
4042 check_lock_length(u64 offset, u64 length)
4044 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
4045 LOFF_OVERFLOW(offset, length)));
4048 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4050 struct nfs4_file *fp = lock_stp->st_file;
4051 int oflag = nfs4_access_to_omode(access);
4053 if (test_access(access, lock_stp))
4055 nfs4_file_get_access(fp, oflag);
4056 set_access(access, lock_stp);
4059 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)
4061 struct nfs4_file *fi = ost->st_file;
4062 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4063 struct nfs4_client *cl = oo->oo_owner.so_client;
4064 struct nfs4_lockowner *lo;
4065 unsigned int strhashval;
4067 lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
4069 if (!cstate->minorversion)
4070 return nfserr_bad_seqid;
4071 /* XXX: a lockowner always has exactly one stateid: */
4072 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4073 struct nfs4_ol_stateid, st_perstateowner);
4076 strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4077 &lock->v.new.owner);
4078 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4080 return nfserr_jukebox;
4081 *lst = alloc_init_lock_stateid(lo, fi, ost);
4083 release_lockowner(lo);
4084 return nfserr_jukebox;
4094 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4095 struct nfsd4_lock *lock)
4097 struct nfs4_openowner *open_sop = NULL;
4098 struct nfs4_lockowner *lock_sop = NULL;
4099 struct nfs4_ol_stateid *lock_stp;
4100 struct file *filp = NULL;
4101 struct file_lock *file_lock = NULL;
4102 struct file_lock *conflock = NULL;
4104 bool new_state = false;
4107 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4109 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4110 (long long) lock->lk_offset,
4111 (long long) lock->lk_length);
4113 if (check_lock_length(lock->lk_offset, lock->lk_length))
4114 return nfserr_inval;
4116 if ((status = fh_verify(rqstp, &cstate->current_fh,
4117 S_IFREG, NFSD_MAY_LOCK))) {
4118 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4124 if (lock->lk_is_new) {
4125 struct nfs4_ol_stateid *open_stp = NULL;
4127 if (nfsd4_has_session(cstate))
4128 /* See rfc 5661 18.10.3: given clientid is ignored: */
4129 memcpy(&lock->v.new.clientid,
4130 &cstate->session->se_client->cl_clientid,
4131 sizeof(clientid_t));
4133 status = nfserr_stale_clientid;
4134 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4137 /* validate and update open stateid and open seqid */
4138 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4139 lock->lk_new_open_seqid,
4140 &lock->lk_new_open_stateid,
4144 open_sop = openowner(open_stp->st_stateowner);
4145 status = nfserr_bad_stateid;
4146 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4147 &lock->v.new.clientid))
4149 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4150 &lock_stp, &new_state);
4152 status = nfs4_preprocess_seqid_op(cstate,
4153 lock->lk_old_lock_seqid,
4154 &lock->lk_old_lock_stateid,
4155 NFS4_LOCK_STID, &lock_stp);
4158 lock_sop = lockowner(lock_stp->st_stateowner);
4160 lkflg = setlkflg(lock->lk_type);
4161 status = nfs4_check_openmode(lock_stp, lkflg);
4165 status = nfserr_grace;
4166 if (locks_in_grace(SVC_NET(rqstp)) && !lock->lk_reclaim)
4168 status = nfserr_no_grace;
4169 if (!locks_in_grace(SVC_NET(rqstp)) && lock->lk_reclaim)
4172 file_lock = locks_alloc_lock();
4174 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4175 status = nfserr_jukebox;
4179 locks_init_lock(file_lock);
4180 switch (lock->lk_type) {
4183 filp = find_readable_file(lock_stp->st_file);
4185 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4186 file_lock->fl_type = F_RDLCK;
4189 case NFS4_WRITEW_LT:
4190 filp = find_writeable_file(lock_stp->st_file);
4192 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4193 file_lock->fl_type = F_WRLCK;
4196 status = nfserr_inval;
4200 status = nfserr_openmode;
4203 file_lock->fl_owner = (fl_owner_t)lock_sop;
4204 file_lock->fl_pid = current->tgid;
4205 file_lock->fl_file = filp;
4206 file_lock->fl_flags = FL_POSIX;
4207 file_lock->fl_lmops = &nfsd_posix_mng_ops;
4208 file_lock->fl_start = lock->lk_offset;
4209 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4210 nfs4_transform_lock_offset(file_lock);
4212 conflock = locks_alloc_lock();
4214 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4215 status = nfserr_jukebox;
4219 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4221 case 0: /* success! */
4222 update_stateid(&lock_stp->st_stid.sc_stateid);
4223 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4227 case (EAGAIN): /* conflock holds conflicting lock */
4228 status = nfserr_denied;
4229 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4230 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4233 status = nfserr_deadlock;
4236 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4237 status = nfserrno(err);
4241 if (status && new_state)
4242 release_lockowner(lock_sop);
4243 if (!cstate->replay_owner)
4244 nfs4_unlock_state();
4246 locks_free_lock(file_lock);
4248 locks_free_lock(conflock);
4253 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4254 * so we do a temporary open here just to get an open file to pass to
4255 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
4258 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4261 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4263 err = nfserrno(vfs_test_lock(file, lock));
4273 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4274 struct nfsd4_lockt *lockt)
4276 struct inode *inode;
4277 struct file_lock *file_lock = NULL;
4278 struct nfs4_lockowner *lo;
4280 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4282 if (locks_in_grace(SVC_NET(rqstp)))
4283 return nfserr_grace;
4285 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4286 return nfserr_inval;
4290 status = nfserr_stale_clientid;
4291 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid, nn))
4294 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4297 inode = cstate->current_fh.fh_dentry->d_inode;
4298 file_lock = locks_alloc_lock();
4300 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4301 status = nfserr_jukebox;
4304 locks_init_lock(file_lock);
4305 switch (lockt->lt_type) {
4308 file_lock->fl_type = F_RDLCK;
4311 case NFS4_WRITEW_LT:
4312 file_lock->fl_type = F_WRLCK;
4315 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4316 status = nfserr_inval;
4320 lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4322 file_lock->fl_owner = (fl_owner_t)lo;
4323 file_lock->fl_pid = current->tgid;
4324 file_lock->fl_flags = FL_POSIX;
4326 file_lock->fl_start = lockt->lt_offset;
4327 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4329 nfs4_transform_lock_offset(file_lock);
4331 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4335 if (file_lock->fl_type != F_UNLCK) {
4336 status = nfserr_denied;
4337 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4340 nfs4_unlock_state();
4342 locks_free_lock(file_lock);
4347 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4348 struct nfsd4_locku *locku)
4350 struct nfs4_ol_stateid *stp;
4351 struct file *filp = NULL;
4352 struct file_lock *file_lock = NULL;
4356 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4357 (long long) locku->lu_offset,
4358 (long long) locku->lu_length);
4360 if (check_lock_length(locku->lu_offset, locku->lu_length))
4361 return nfserr_inval;
4365 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4366 &locku->lu_stateid, NFS4_LOCK_STID, &stp);
4369 filp = find_any_file(stp->st_file);
4371 status = nfserr_lock_range;
4374 file_lock = locks_alloc_lock();
4376 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4377 status = nfserr_jukebox;
4380 locks_init_lock(file_lock);
4381 file_lock->fl_type = F_UNLCK;
4382 file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4383 file_lock->fl_pid = current->tgid;
4384 file_lock->fl_file = filp;
4385 file_lock->fl_flags = FL_POSIX;
4386 file_lock->fl_lmops = &nfsd_posix_mng_ops;
4387 file_lock->fl_start = locku->lu_offset;
4389 file_lock->fl_end = last_byte_offset(locku->lu_offset,
4391 nfs4_transform_lock_offset(file_lock);
4394 * Try to unlock the file in the VFS.
4396 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4398 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4402 * OK, unlock succeeded; the only thing left to do is update the stateid.
4404 update_stateid(&stp->st_stid.sc_stateid);
4405 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4408 if (!cstate->replay_owner)
4409 nfs4_unlock_state();
4411 locks_free_lock(file_lock);
4415 status = nfserrno(err);
4421 * 1: locks held by lockowner
4422 * 0: no locks held by lockowner
4425 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4427 struct file_lock **flpp;
4428 struct inode *inode = filp->fi_inode;
4432 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4433 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4444 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4445 struct nfsd4_compound_state *cstate,
4446 struct nfsd4_release_lockowner *rlockowner)
4448 clientid_t *clid = &rlockowner->rl_clientid;
4449 struct nfs4_stateowner *sop;
4450 struct nfs4_lockowner *lo;
4451 struct nfs4_ol_stateid *stp;
4452 struct xdr_netobj *owner = &rlockowner->rl_owner;
4453 struct list_head matches;
4454 unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4456 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4458 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4459 clid->cl_boot, clid->cl_id);
4461 /* XXX check for lease expiration */
4463 status = nfserr_stale_clientid;
4464 if (STALE_CLIENTID(clid, nn))
4469 status = nfserr_locks_held;
4470 INIT_LIST_HEAD(&matches);
4472 list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) {
4473 if (sop->so_is_open_owner)
4475 if (!same_owner_str(sop, owner, clid))
4477 list_for_each_entry(stp, &sop->so_stateids,
4479 lo = lockowner(sop);
4480 if (check_for_locks(stp->st_file, lo))
4482 list_add(&lo->lo_list, &matches);
4485 /* Clients probably won't expect us to return with some (but not all)
4486 * of the lockowner state released; so don't release any until all
4487 * have been checked. */
4489 while (!list_empty(&matches)) {
4490 lo = list_entry(matches.next, struct nfs4_lockowner,
4492 /* unhash_stateowner deletes so_perclient only
4493 * for openowners. */
4494 list_del(&lo->lo_list);
4495 release_lockowner(lo);
4498 nfs4_unlock_state();
4502 static inline struct nfs4_client_reclaim *
4505 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4509 nfs4_has_reclaimed_state(const char *name)
4511 struct nfs4_client_reclaim *crp;
4513 crp = nfsd4_find_reclaim_client(name);
4514 return (crp && crp->cr_clp);
4518 * failure => all reset bets are off, nfserr_no_grace...
4520 struct nfs4_client_reclaim *
4521 nfs4_client_to_reclaim(const char *name)
4523 unsigned int strhashval;
4524 struct nfs4_client_reclaim *crp;
4526 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4527 crp = alloc_reclaim();
4529 strhashval = clientstr_hashval(name);
4530 INIT_LIST_HEAD(&crp->cr_strhash);
4531 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4532 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4534 reclaim_str_hashtbl_size++;
4540 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp)
4542 list_del(&crp->cr_strhash);
4544 reclaim_str_hashtbl_size--;
4548 nfs4_release_reclaim(void)
4550 struct nfs4_client_reclaim *crp = NULL;
4553 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4554 while (!list_empty(&reclaim_str_hashtbl[i])) {
4555 crp = list_entry(reclaim_str_hashtbl[i].next,
4556 struct nfs4_client_reclaim, cr_strhash);
4557 nfs4_remove_reclaim_record(crp);
4560 BUG_ON(reclaim_str_hashtbl_size);
4564 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4565 struct nfs4_client_reclaim *
4566 nfsd4_find_reclaim_client(const char *recdir)
4568 unsigned int strhashval;
4569 struct nfs4_client_reclaim *crp = NULL;
4571 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4573 strhashval = clientstr_hashval(recdir);
4574 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4575 if (same_name(crp->cr_recdir, recdir)) {
4583 * Called from OPEN. Look for clientid in reclaim list.
4586 nfs4_check_open_reclaim(clientid_t *clid, bool sessions)
4588 struct nfs4_client *clp;
4590 /* find clientid in conf_id_hashtbl */
4591 clp = find_confirmed_client(clid, sessions);
4593 return nfserr_reclaim_bad;
4595 return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4598 #ifdef CONFIG_NFSD_FAULT_INJECTION
4600 void nfsd_forget_clients(u64 num)
4602 struct nfs4_client *clp, *next;
4606 list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
4611 nfs4_unlock_state();
4613 printk(KERN_INFO "NFSD: Forgot %d clients", count);
4616 static void release_lockowner_sop(struct nfs4_stateowner *sop)
4618 release_lockowner(lockowner(sop));
4621 static void release_openowner_sop(struct nfs4_stateowner *sop)
4623 release_openowner(openowner(sop));
4626 static int nfsd_release_n_owners(u64 num, bool is_open_owner,
4627 void (*release_sop)(struct nfs4_stateowner *))
4630 struct nfs4_stateowner *sop, *next;
4632 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4633 list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) {
4634 if (sop->so_is_open_owner != is_open_owner)
4644 void nfsd_forget_locks(u64 num)
4649 count = nfsd_release_n_owners(num, false, release_lockowner_sop);
4650 nfs4_unlock_state();
4652 printk(KERN_INFO "NFSD: Forgot %d locks", count);
4655 void nfsd_forget_openowners(u64 num)
4660 count = nfsd_release_n_owners(num, true, release_openowner_sop);
4661 nfs4_unlock_state();
4663 printk(KERN_INFO "NFSD: Forgot %d open owners", count);
4666 static int nfsd_process_n_delegations(u64 num, struct list_head *list)
4669 struct nfs4_file *fp, *fnext;
4670 struct nfs4_delegation *dp, *dnext;
4672 for (i = 0; i < FILE_HASH_SIZE; i++) {
4673 list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
4674 list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
4675 list_move(&dp->dl_recall_lru, list);
4685 void nfsd_forget_delegations(u64 num)
4689 struct nfs4_delegation *dp, *dnext;
4691 spin_lock(&recall_lock);
4692 count = nfsd_process_n_delegations(num, &victims);
4693 spin_unlock(&recall_lock);
4696 list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru)
4697 unhash_delegation(dp);
4698 nfs4_unlock_state();
4700 printk(KERN_INFO "NFSD: Forgot %d delegations", count);
4703 void nfsd_recall_delegations(u64 num)
4707 struct nfs4_delegation *dp, *dnext;
4709 spin_lock(&recall_lock);
4710 count = nfsd_process_n_delegations(num, &victims);
4711 list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru) {
4712 list_del(&dp->dl_recall_lru);
4713 nfsd_break_one_deleg(dp);
4715 spin_unlock(&recall_lock);
4717 printk(KERN_INFO "NFSD: Recalled %d delegations", count);
4720 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4722 /* initialization to perform at module load time: */
4725 nfs4_state_init(void)
4729 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4730 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4731 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4732 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4734 conf_name_tree = RB_ROOT;
4735 unconf_name_tree = RB_ROOT;
4736 for (i = 0; i < SESSION_HASH_SIZE; i++)
4737 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4738 for (i = 0; i < FILE_HASH_SIZE; i++) {
4739 INIT_LIST_HEAD(&file_hashtbl[i]);
4741 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4742 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4744 for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4745 INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
4746 INIT_LIST_HEAD(&close_lru);
4747 INIT_LIST_HEAD(&client_lru);
4748 INIT_LIST_HEAD(&del_recall_lru);
4749 reclaim_str_hashtbl_size = 0;
4753 * Since the lifetime of a delegation isn't limited to that of an open, a
4754 * client may quite reasonably hang on to a delegation as long as it has
4755 * the inode cached. This becomes an obvious problem the first time a
4756 * client's inode cache approaches the size of the server's total memory.
4758 * For now we avoid this problem by imposing a hard limit on the number
4759 * of delegations, which varies according to the server's memory size.
4762 set_max_delegations(void)
4765 * Allow at most 4 delegations per megabyte of RAM. Quick
4766 * estimates suggest that in the worst case (where every delegation
4767 * is for a different inode), a delegation could take about 1.5K,
4768 * giving a worst case usage of about 6% of memory.
4770 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4773 /* initialization to perform when the nfsd service is started: */
4776 nfs4_state_start(void)
4778 struct net *net = &init_net;
4779 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4783 * FIXME: For now, we hang most of the pernet global stuff off of
4784 * init_net until nfsd is fully containerized. Eventually, we'll
4785 * need to pass a net pointer into this function, take a reference
4786 * to that instead and then do most of the rest of this on a per-net
4790 nfsd4_client_tracking_init(net);
4791 nn->boot_time = get_seconds();
4792 locks_start_grace(net, &nn->nfsd4_manager);
4793 nn->grace_ended = false;
4794 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4796 ret = set_callback_cred();
4801 laundry_wq = create_singlethread_workqueue("nfsd4");
4802 if (laundry_wq == NULL) {
4806 ret = nfsd4_create_callback_queue();
4808 goto out_free_laundry;
4809 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4810 set_max_delegations();
4813 destroy_workqueue(laundry_wq);
4815 nfsd4_client_tracking_exit(net);
4820 /* should be called with the state lock held */
4822 __nfs4_state_shutdown(void)
4825 struct nfs4_client *clp = NULL;
4826 struct nfs4_delegation *dp = NULL;
4827 struct list_head *pos, *next, reaplist;
4828 struct rb_node *node, *tmp;
4830 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4831 while (!list_empty(&conf_id_hashtbl[i])) {
4832 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4833 destroy_client(clp);
4837 node = rb_first(&unconf_name_tree);
4838 while (node != NULL) {
4840 node = rb_next(tmp);
4841 clp = rb_entry(tmp, struct nfs4_client, cl_namenode);
4842 rb_erase(tmp, &unconf_name_tree);
4843 destroy_client(clp);
4846 INIT_LIST_HEAD(&reaplist);
4847 spin_lock(&recall_lock);
4848 list_for_each_safe(pos, next, &del_recall_lru) {
4849 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4850 list_move(&dp->dl_recall_lru, &reaplist);
4852 spin_unlock(&recall_lock);
4853 list_for_each_safe(pos, next, &reaplist) {
4854 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4855 unhash_delegation(dp);
4858 nfsd4_client_tracking_exit(&init_net);
4863 nfs4_state_shutdown(void)
4865 struct net *net = &init_net;
4866 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4868 cancel_delayed_work_sync(&laundromat_work);
4869 destroy_workqueue(laundry_wq);
4870 locks_end_grace(&nn->nfsd4_manager);
4872 __nfs4_state_shutdown();
4873 nfs4_unlock_state();
4874 nfsd4_destroy_callback_queue();
4878 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4880 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4881 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
4885 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4887 if (cstate->minorversion) {
4888 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4889 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4894 clear_current_stateid(struct nfsd4_compound_state *cstate)
4896 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4900 * functions to set current state id
4903 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4905 put_stateid(cstate, &odp->od_stateid);
4909 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4911 put_stateid(cstate, &open->op_stateid);
4915 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4917 put_stateid(cstate, &close->cl_stateid);
4921 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
4923 put_stateid(cstate, &lock->lk_resp_stateid);
4927 * functions to consume current state id
4931 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4933 get_stateid(cstate, &odp->od_stateid);
4937 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
4939 get_stateid(cstate, &drp->dr_stateid);
4943 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
4945 get_stateid(cstate, &fsp->fr_stateid);
4949 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
4951 get_stateid(cstate, &setattr->sa_stateid);
4955 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4957 get_stateid(cstate, &close->cl_stateid);
4961 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
4963 get_stateid(cstate, &locku->lu_stateid);
4967 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
4969 get_stateid(cstate, &read->rd_stateid);
4973 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
4975 get_stateid(cstate, &write->wr_stateid);