NFSd: call rpc_destroy_wait_queue() from free_client()
[pandora-kernel.git] / fs / nfsd / nfs4state.c
1 /*
2 *  Copyright (c) 2001 The Regents of the University of Michigan.
3 *  All rights reserved.
4 *
5 *  Kendrick Smith <kmsmith@umich.edu>
6 *  Andy Adamson <kandros@umich.edu>
7 *
8 *  Redistribution and use in source and binary forms, with or without
9 *  modification, are permitted provided that the following conditions
10 *  are met:
11 *
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.
20 *
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.
32 *
33 */
34
35 #include <linux/file.h>
36 #include <linux/fs.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include "xdr4.h"
45 #include "xdr4cb.h"
46 #include "vfs.h"
47 #include "current_stateid.h"
48
49 #include "netns.h"
50
51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
52
53 #define all_ones {{~0,~0},~0}
54 static const stateid_t one_stateid = {
55         .si_generation = ~0,
56         .si_opaque = all_ones,
57 };
58 static const stateid_t zero_stateid = {
59         /* all fields zero */
60 };
61 static const stateid_t currentstateid = {
62         .si_generation = 1,
63 };
64
65 static u64 current_sessionid = 1;
66
67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
68 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
69 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
70
71 /* forward declarations */
72 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
73
74 /* Locking: */
75
76 /* Currently used for almost all code touching nfsv4 state: */
77 static DEFINE_MUTEX(client_mutex);
78
79 /*
80  * Currently used for the del_recall_lru and file hash table.  In an
81  * effort to decrease the scope of the client_mutex, this spinlock may
82  * eventually cover more:
83  */
84 static DEFINE_SPINLOCK(recall_lock);
85
86 static struct kmem_cache *openowner_slab = NULL;
87 static struct kmem_cache *lockowner_slab = NULL;
88 static struct kmem_cache *file_slab = NULL;
89 static struct kmem_cache *stateid_slab = NULL;
90 static struct kmem_cache *deleg_slab = NULL;
91
92 void
93 nfs4_lock_state(void)
94 {
95         mutex_lock(&client_mutex);
96 }
97
98 static void free_session(struct nfsd4_session *);
99
100 static bool is_session_dead(struct nfsd4_session *ses)
101 {
102         return ses->se_flags & NFS4_SESSION_DEAD;
103 }
104
105 void nfsd4_put_session(struct nfsd4_session *ses)
106 {
107         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
108                 free_session(ses);
109 }
110
111 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
112 {
113         if (atomic_read(&ses->se_ref) > ref_held_by_me)
114                 return nfserr_jukebox;
115         ses->se_flags |= NFS4_SESSION_DEAD;
116         return nfs_ok;
117 }
118
119 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
120 {
121         if (is_session_dead(ses))
122                 return nfserr_badsession;
123         atomic_inc(&ses->se_ref);
124         return nfs_ok;
125 }
126
127 void
128 nfs4_unlock_state(void)
129 {
130         mutex_unlock(&client_mutex);
131 }
132
133 static bool is_client_expired(struct nfs4_client *clp)
134 {
135         return clp->cl_time == 0;
136 }
137
138 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
139 {
140         if (atomic_read(&clp->cl_refcount))
141                 return nfserr_jukebox;
142         clp->cl_time = 0;
143         return nfs_ok;
144 }
145
146 static __be32 mark_client_expired(struct nfs4_client *clp)
147 {
148         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
149         __be32 ret;
150
151         spin_lock(&nn->client_lock);
152         ret = mark_client_expired_locked(clp);
153         spin_unlock(&nn->client_lock);
154         return ret;
155 }
156
157 static __be32 get_client_locked(struct nfs4_client *clp)
158 {
159         if (is_client_expired(clp))
160                 return nfserr_expired;
161         atomic_inc(&clp->cl_refcount);
162         return nfs_ok;
163 }
164
165 /* must be called under the client_lock */
166 static inline void
167 renew_client_locked(struct nfs4_client *clp)
168 {
169         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
170
171         if (is_client_expired(clp)) {
172                 WARN_ON(1);
173                 printk("%s: client (clientid %08x/%08x) already expired\n",
174                         __func__,
175                         clp->cl_clientid.cl_boot,
176                         clp->cl_clientid.cl_id);
177                 return;
178         }
179
180         dprintk("renewing client (clientid %08x/%08x)\n",
181                         clp->cl_clientid.cl_boot,
182                         clp->cl_clientid.cl_id);
183         list_move_tail(&clp->cl_lru, &nn->client_lru);
184         clp->cl_time = get_seconds();
185 }
186
187 static inline void
188 renew_client(struct nfs4_client *clp)
189 {
190         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
191
192         spin_lock(&nn->client_lock);
193         renew_client_locked(clp);
194         spin_unlock(&nn->client_lock);
195 }
196
197 static void put_client_renew_locked(struct nfs4_client *clp)
198 {
199         if (!atomic_dec_and_test(&clp->cl_refcount))
200                 return;
201         if (!is_client_expired(clp))
202                 renew_client_locked(clp);
203 }
204
205 void put_client_renew(struct nfs4_client *clp)
206 {
207         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
208
209         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
210                 return;
211         if (!is_client_expired(clp))
212                 renew_client_locked(clp);
213         spin_unlock(&nn->client_lock);
214 }
215
216
217 static inline u32
218 opaque_hashval(const void *ptr, int nbytes)
219 {
220         unsigned char *cptr = (unsigned char *) ptr;
221
222         u32 x = 0;
223         while (nbytes--) {
224                 x *= 37;
225                 x += *cptr++;
226         }
227         return x;
228 }
229
230 static void nfsd4_free_file(struct nfs4_file *f)
231 {
232         kmem_cache_free(file_slab, f);
233 }
234
235 static inline void
236 put_nfs4_file(struct nfs4_file *fi)
237 {
238         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
239                 hlist_del(&fi->fi_hash);
240                 spin_unlock(&recall_lock);
241                 iput(fi->fi_inode);
242                 nfsd4_free_file(fi);
243         }
244 }
245
246 static inline void
247 get_nfs4_file(struct nfs4_file *fi)
248 {
249         atomic_inc(&fi->fi_ref);
250 }
251
252 static int num_delegations;
253 unsigned long max_delegations;
254
255 /*
256  * Open owner state (share locks)
257  */
258
259 /* hash tables for lock and open owners */
260 #define OWNER_HASH_BITS              8
261 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
262 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
263
264 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
265 {
266         unsigned int ret;
267
268         ret = opaque_hashval(ownername->data, ownername->len);
269         ret += clientid;
270         return ret & OWNER_HASH_MASK;
271 }
272
273 /* hash table for nfs4_file */
274 #define FILE_HASH_BITS                   8
275 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
276
277 static unsigned int file_hashval(struct inode *ino)
278 {
279         /* XXX: why are we hashing on inode pointer, anyway? */
280         return hash_ptr(ino, FILE_HASH_BITS);
281 }
282
283 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
284
285 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
286 {
287         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
288         atomic_inc(&fp->fi_access[oflag]);
289 }
290
291 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
292 {
293         if (oflag == O_RDWR) {
294                 __nfs4_file_get_access(fp, O_RDONLY);
295                 __nfs4_file_get_access(fp, O_WRONLY);
296         } else
297                 __nfs4_file_get_access(fp, oflag);
298 }
299
300 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
301 {
302         if (fp->fi_fds[oflag]) {
303                 fput(fp->fi_fds[oflag]);
304                 fp->fi_fds[oflag] = NULL;
305         }
306 }
307
308 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
309 {
310         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
311                 nfs4_file_put_fd(fp, oflag);
312                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
313                         nfs4_file_put_fd(fp, O_RDWR);
314         }
315 }
316
317 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
318 {
319         if (oflag == O_RDWR) {
320                 __nfs4_file_put_access(fp, O_RDONLY);
321                 __nfs4_file_put_access(fp, O_WRONLY);
322         } else
323                 __nfs4_file_put_access(fp, oflag);
324 }
325
326 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
327 kmem_cache *slab)
328 {
329         struct idr *stateids = &cl->cl_stateids;
330         struct nfs4_stid *stid;
331         int new_id;
332
333         stid = kmem_cache_alloc(slab, GFP_KERNEL);
334         if (!stid)
335                 return NULL;
336
337         new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
338         if (new_id < 0)
339                 goto out_free;
340         stid->sc_client = cl;
341         stid->sc_type = 0;
342         stid->sc_stateid.si_opaque.so_id = new_id;
343         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
344         /* Will be incremented before return to client: */
345         stid->sc_stateid.si_generation = 0;
346
347         /*
348          * It shouldn't be a problem to reuse an opaque stateid value.
349          * I don't think it is for 4.1.  But with 4.0 I worry that, for
350          * example, a stray write retransmission could be accepted by
351          * the server when it should have been rejected.  Therefore,
352          * adopt a trick from the sctp code to attempt to maximize the
353          * amount of time until an id is reused, by ensuring they always
354          * "increase" (mod INT_MAX):
355          */
356         return stid;
357 out_free:
358         kmem_cache_free(slab, stid);
359         return NULL;
360 }
361
362 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
363 {
364         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
365 }
366
367 static struct nfs4_delegation *
368 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
369 {
370         struct nfs4_delegation *dp;
371
372         dprintk("NFSD alloc_init_deleg\n");
373         if (num_delegations > max_delegations)
374                 return NULL;
375         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
376         if (dp == NULL)
377                 return dp;
378         dp->dl_stid.sc_type = NFS4_DELEG_STID;
379         /*
380          * delegation seqid's are never incremented.  The 4.1 special
381          * meaning of seqid 0 isn't meaningful, really, but let's avoid
382          * 0 anyway just for consistency and use 1:
383          */
384         dp->dl_stid.sc_stateid.si_generation = 1;
385         num_delegations++;
386         INIT_LIST_HEAD(&dp->dl_perfile);
387         INIT_LIST_HEAD(&dp->dl_perclnt);
388         INIT_LIST_HEAD(&dp->dl_recall_lru);
389         dp->dl_file = NULL;
390         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
391         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
392         dp->dl_time = 0;
393         atomic_set(&dp->dl_count, 1);
394         nfsd4_init_callback(&dp->dl_recall);
395         return dp;
396 }
397
398 static void remove_stid(struct nfs4_stid *s)
399 {
400         struct idr *stateids = &s->sc_client->cl_stateids;
401
402         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
403 }
404
405 static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
406 {
407         kmem_cache_free(slab, s);
408 }
409
410 void
411 nfs4_put_delegation(struct nfs4_delegation *dp)
412 {
413         if (atomic_dec_and_test(&dp->dl_count)) {
414                 nfs4_free_stid(deleg_slab, &dp->dl_stid);
415                 num_delegations--;
416         }
417 }
418
419 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
420 {
421         if (atomic_dec_and_test(&fp->fi_delegees)) {
422                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
423                 fp->fi_lease = NULL;
424                 fput(fp->fi_deleg_file);
425                 fp->fi_deleg_file = NULL;
426         }
427 }
428
429 static void unhash_stid(struct nfs4_stid *s)
430 {
431         s->sc_type = 0;
432 }
433
434 /* Called under the state lock. */
435 static void
436 unhash_delegation(struct nfs4_delegation *dp)
437 {
438         list_del_init(&dp->dl_perclnt);
439         spin_lock(&recall_lock);
440         list_del_init(&dp->dl_perfile);
441         list_del_init(&dp->dl_recall_lru);
442         spin_unlock(&recall_lock);
443         nfs4_put_deleg_lease(dp->dl_file);
444         put_nfs4_file(dp->dl_file);
445         dp->dl_file = NULL;
446 }
447
448
449
450 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
451 {
452         list_del_init(&dp->dl_recall_lru);
453         remove_stid(&dp->dl_stid);
454         nfs4_put_delegation(dp);
455 }
456
457 static void destroy_delegation(struct nfs4_delegation *dp)
458 {
459         unhash_delegation(dp);
460         remove_stid(&dp->dl_stid);
461         nfs4_put_delegation(dp);
462 }
463
464 static void revoke_delegation(struct nfs4_delegation *dp)
465 {
466         struct nfs4_client *clp = dp->dl_stid.sc_client;
467
468         if (clp->cl_minorversion == 0)
469                 destroy_delegation(dp);
470         else {
471                 unhash_delegation(dp);
472                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
473                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
474         }
475 }
476
477 /* 
478  * SETCLIENTID state 
479  */
480
481 static unsigned int clientid_hashval(u32 id)
482 {
483         return id & CLIENT_HASH_MASK;
484 }
485
486 static unsigned int clientstr_hashval(const char *name)
487 {
488         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
489 }
490
491 /*
492  * We store the NONE, READ, WRITE, and BOTH bits separately in the
493  * st_{access,deny}_bmap field of the stateid, in order to track not
494  * only what share bits are currently in force, but also what
495  * combinations of share bits previous opens have used.  This allows us
496  * to enforce the recommendation of rfc 3530 14.2.19 that the server
497  * return an error if the client attempt to downgrade to a combination
498  * of share bits not explicable by closing some of its previous opens.
499  *
500  * XXX: This enforcement is actually incomplete, since we don't keep
501  * track of access/deny bit combinations; so, e.g., we allow:
502  *
503  *      OPEN allow read, deny write
504  *      OPEN allow both, deny none
505  *      DOWNGRADE allow read, deny none
506  *
507  * which we should reject.
508  */
509 static unsigned int
510 bmap_to_share_mode(unsigned long bmap) {
511         int i;
512         unsigned int access = 0;
513
514         for (i = 1; i < 4; i++) {
515                 if (test_bit(i, &bmap))
516                         access |= i;
517         }
518         return access;
519 }
520
521 static bool
522 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
523         unsigned int access, deny;
524
525         access = bmap_to_share_mode(stp->st_access_bmap);
526         deny = bmap_to_share_mode(stp->st_deny_bmap);
527         if ((access & open->op_share_deny) || (deny & open->op_share_access))
528                 return false;
529         return true;
530 }
531
532 /* set share access for a given stateid */
533 static inline void
534 set_access(u32 access, struct nfs4_ol_stateid *stp)
535 {
536         __set_bit(access, &stp->st_access_bmap);
537 }
538
539 /* clear share access for a given stateid */
540 static inline void
541 clear_access(u32 access, struct nfs4_ol_stateid *stp)
542 {
543         __clear_bit(access, &stp->st_access_bmap);
544 }
545
546 /* test whether a given stateid has access */
547 static inline bool
548 test_access(u32 access, struct nfs4_ol_stateid *stp)
549 {
550         return test_bit(access, &stp->st_access_bmap);
551 }
552
553 /* set share deny for a given stateid */
554 static inline void
555 set_deny(u32 access, struct nfs4_ol_stateid *stp)
556 {
557         __set_bit(access, &stp->st_deny_bmap);
558 }
559
560 /* clear share deny for a given stateid */
561 static inline void
562 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
563 {
564         __clear_bit(access, &stp->st_deny_bmap);
565 }
566
567 /* test whether a given stateid is denying specific access */
568 static inline bool
569 test_deny(u32 access, struct nfs4_ol_stateid *stp)
570 {
571         return test_bit(access, &stp->st_deny_bmap);
572 }
573
574 static int nfs4_access_to_omode(u32 access)
575 {
576         switch (access & NFS4_SHARE_ACCESS_BOTH) {
577         case NFS4_SHARE_ACCESS_READ:
578                 return O_RDONLY;
579         case NFS4_SHARE_ACCESS_WRITE:
580                 return O_WRONLY;
581         case NFS4_SHARE_ACCESS_BOTH:
582                 return O_RDWR;
583         }
584         WARN_ON_ONCE(1);
585         return O_RDONLY;
586 }
587
588 /* release all access and file references for a given stateid */
589 static void
590 release_all_access(struct nfs4_ol_stateid *stp)
591 {
592         int i;
593
594         for (i = 1; i < 4; i++) {
595                 if (test_access(i, stp))
596                         nfs4_file_put_access(stp->st_file,
597                                              nfs4_access_to_omode(i));
598                 clear_access(i, stp);
599         }
600 }
601
602 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
603 {
604         list_del(&stp->st_perfile);
605         list_del(&stp->st_perstateowner);
606 }
607
608 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
609 {
610         release_all_access(stp);
611         put_nfs4_file(stp->st_file);
612         stp->st_file = NULL;
613 }
614
615 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
616 {
617         remove_stid(&stp->st_stid);
618         nfs4_free_stid(stateid_slab, &stp->st_stid);
619 }
620
621 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
622 {
623         struct file *file;
624
625         unhash_generic_stateid(stp);
626         unhash_stid(&stp->st_stid);
627         file = find_any_file(stp->st_file);
628         if (file)
629                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
630         close_generic_stateid(stp);
631         free_generic_stateid(stp);
632 }
633
634 static void unhash_lockowner(struct nfs4_lockowner *lo)
635 {
636         struct nfs4_ol_stateid *stp;
637
638         list_del(&lo->lo_owner.so_strhash);
639         list_del(&lo->lo_perstateid);
640         list_del(&lo->lo_owner_ino_hash);
641         while (!list_empty(&lo->lo_owner.so_stateids)) {
642                 stp = list_first_entry(&lo->lo_owner.so_stateids,
643                                 struct nfs4_ol_stateid, st_perstateowner);
644                 release_lock_stateid(stp);
645         }
646 }
647
648 static void release_lockowner(struct nfs4_lockowner *lo)
649 {
650         unhash_lockowner(lo);
651         nfs4_free_lockowner(lo);
652 }
653
654 static void
655 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
656 {
657         struct nfs4_lockowner *lo;
658
659         while (!list_empty(&open_stp->st_lockowners)) {
660                 lo = list_entry(open_stp->st_lockowners.next,
661                                 struct nfs4_lockowner, lo_perstateid);
662                 release_lockowner(lo);
663         }
664 }
665
666 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
667 {
668         unhash_generic_stateid(stp);
669         release_stateid_lockowners(stp);
670         close_generic_stateid(stp);
671 }
672
673 static void release_open_stateid(struct nfs4_ol_stateid *stp)
674 {
675         unhash_open_stateid(stp);
676         free_generic_stateid(stp);
677 }
678
679 static void unhash_openowner(struct nfs4_openowner *oo)
680 {
681         struct nfs4_ol_stateid *stp;
682
683         list_del(&oo->oo_owner.so_strhash);
684         list_del(&oo->oo_perclient);
685         while (!list_empty(&oo->oo_owner.so_stateids)) {
686                 stp = list_first_entry(&oo->oo_owner.so_stateids,
687                                 struct nfs4_ol_stateid, st_perstateowner);
688                 release_open_stateid(stp);
689         }
690 }
691
692 static void release_last_closed_stateid(struct nfs4_openowner *oo)
693 {
694         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
695
696         if (s) {
697                 free_generic_stateid(s);
698                 oo->oo_last_closed_stid = NULL;
699         }
700 }
701
702 static void release_openowner(struct nfs4_openowner *oo)
703 {
704         unhash_openowner(oo);
705         list_del(&oo->oo_close_lru);
706         release_last_closed_stateid(oo);
707         nfs4_free_openowner(oo);
708 }
709
710 static inline int
711 hash_sessionid(struct nfs4_sessionid *sessionid)
712 {
713         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
714
715         return sid->sequence % SESSION_HASH_SIZE;
716 }
717
718 #ifdef NFSD_DEBUG
719 static inline void
720 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
721 {
722         u32 *ptr = (u32 *)(&sessionid->data[0]);
723         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
724 }
725 #else
726 static inline void
727 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
728 {
729 }
730 #endif
731
732 /*
733  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
734  * won't be used for replay.
735  */
736 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
737 {
738         struct nfs4_stateowner *so = cstate->replay_owner;
739
740         if (nfserr == nfserr_replay_me)
741                 return;
742
743         if (!seqid_mutating_err(ntohl(nfserr))) {
744                 cstate->replay_owner = NULL;
745                 return;
746         }
747         if (!so)
748                 return;
749         if (so->so_is_open_owner)
750                 release_last_closed_stateid(openowner(so));
751         so->so_seqid++;
752         return;
753 }
754
755 static void
756 gen_sessionid(struct nfsd4_session *ses)
757 {
758         struct nfs4_client *clp = ses->se_client;
759         struct nfsd4_sessionid *sid;
760
761         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
762         sid->clientid = clp->cl_clientid;
763         sid->sequence = current_sessionid++;
764         sid->reserved = 0;
765 }
766
767 /*
768  * The protocol defines ca_maxresponssize_cached to include the size of
769  * the rpc header, but all we need to cache is the data starting after
770  * the end of the initial SEQUENCE operation--the rest we regenerate
771  * each time.  Therefore we can advertise a ca_maxresponssize_cached
772  * value that is the number of bytes in our cache plus a few additional
773  * bytes.  In order to stay on the safe side, and not promise more than
774  * we can cache, those additional bytes must be the minimum possible: 24
775  * bytes of rpc header (xid through accept state, with AUTH_NULL
776  * verifier), 12 for the compound header (with zero-length tag), and 44
777  * for the SEQUENCE op response:
778  */
779 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
780
781 static void
782 free_session_slots(struct nfsd4_session *ses)
783 {
784         int i;
785
786         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
787                 kfree(ses->se_slots[i]);
788 }
789
790 /*
791  * We don't actually need to cache the rpc and session headers, so we
792  * can allocate a little less for each slot:
793  */
794 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
795 {
796         u32 size;
797
798         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
799                 size = 0;
800         else
801                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
802         return size + sizeof(struct nfsd4_slot);
803 }
804
805 /*
806  * XXX: If we run out of reserved DRC memory we could (up to a point)
807  * re-negotiate active sessions and reduce their slot usage to make
808  * room for new connections. For now we just fail the create session.
809  */
810 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
811 {
812         u32 slotsize = slot_bytes(ca);
813         u32 num = ca->maxreqs;
814         int avail;
815
816         spin_lock(&nfsd_drc_lock);
817         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
818                     nfsd_drc_max_mem - nfsd_drc_mem_used);
819         num = min_t(int, num, avail / slotsize);
820         nfsd_drc_mem_used += num * slotsize;
821         spin_unlock(&nfsd_drc_lock);
822
823         return num;
824 }
825
826 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
827 {
828         int slotsize = slot_bytes(ca);
829
830         spin_lock(&nfsd_drc_lock);
831         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
832         spin_unlock(&nfsd_drc_lock);
833 }
834
835 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
836                                            struct nfsd4_channel_attrs *battrs)
837 {
838         int numslots = fattrs->maxreqs;
839         int slotsize = slot_bytes(fattrs);
840         struct nfsd4_session *new;
841         int mem, i;
842
843         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
844                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
845         mem = numslots * sizeof(struct nfsd4_slot *);
846
847         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
848         if (!new)
849                 return NULL;
850         /* allocate each struct nfsd4_slot and data cache in one piece */
851         for (i = 0; i < numslots; i++) {
852                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
853                 if (!new->se_slots[i])
854                         goto out_free;
855         }
856
857         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
858         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
859
860         return new;
861 out_free:
862         while (i--)
863                 kfree(new->se_slots[i]);
864         kfree(new);
865         return NULL;
866 }
867
868 static void free_conn(struct nfsd4_conn *c)
869 {
870         svc_xprt_put(c->cn_xprt);
871         kfree(c);
872 }
873
874 static void nfsd4_conn_lost(struct svc_xpt_user *u)
875 {
876         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
877         struct nfs4_client *clp = c->cn_session->se_client;
878
879         spin_lock(&clp->cl_lock);
880         if (!list_empty(&c->cn_persession)) {
881                 list_del(&c->cn_persession);
882                 free_conn(c);
883         }
884         nfsd4_probe_callback(clp);
885         spin_unlock(&clp->cl_lock);
886 }
887
888 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
889 {
890         struct nfsd4_conn *conn;
891
892         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
893         if (!conn)
894                 return NULL;
895         svc_xprt_get(rqstp->rq_xprt);
896         conn->cn_xprt = rqstp->rq_xprt;
897         conn->cn_flags = flags;
898         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
899         return conn;
900 }
901
902 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
903 {
904         conn->cn_session = ses;
905         list_add(&conn->cn_persession, &ses->se_conns);
906 }
907
908 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
909 {
910         struct nfs4_client *clp = ses->se_client;
911
912         spin_lock(&clp->cl_lock);
913         __nfsd4_hash_conn(conn, ses);
914         spin_unlock(&clp->cl_lock);
915 }
916
917 static int nfsd4_register_conn(struct nfsd4_conn *conn)
918 {
919         conn->cn_xpt_user.callback = nfsd4_conn_lost;
920         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
921 }
922
923 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
924 {
925         int ret;
926
927         nfsd4_hash_conn(conn, ses);
928         ret = nfsd4_register_conn(conn);
929         if (ret)
930                 /* oops; xprt is already down: */
931                 nfsd4_conn_lost(&conn->cn_xpt_user);
932         if (conn->cn_flags & NFS4_CDFC4_BACK) {
933                 /* callback channel may be back up */
934                 nfsd4_probe_callback(ses->se_client);
935         }
936 }
937
938 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
939 {
940         u32 dir = NFS4_CDFC4_FORE;
941
942         if (cses->flags & SESSION4_BACK_CHAN)
943                 dir |= NFS4_CDFC4_BACK;
944         return alloc_conn(rqstp, dir);
945 }
946
947 /* must be called under client_lock */
948 static void nfsd4_del_conns(struct nfsd4_session *s)
949 {
950         struct nfs4_client *clp = s->se_client;
951         struct nfsd4_conn *c;
952
953         spin_lock(&clp->cl_lock);
954         while (!list_empty(&s->se_conns)) {
955                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
956                 list_del_init(&c->cn_persession);
957                 spin_unlock(&clp->cl_lock);
958
959                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
960                 free_conn(c);
961
962                 spin_lock(&clp->cl_lock);
963         }
964         spin_unlock(&clp->cl_lock);
965 }
966
967 static void __free_session(struct nfsd4_session *ses)
968 {
969         free_session_slots(ses);
970         kfree(ses);
971 }
972
973 static void free_session(struct nfsd4_session *ses)
974 {
975         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
976
977         lockdep_assert_held(&nn->client_lock);
978         nfsd4_del_conns(ses);
979         nfsd4_put_drc_mem(&ses->se_fchannel);
980         __free_session(ses);
981 }
982
983 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
984 {
985         int idx;
986         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
987
988         new->se_client = clp;
989         gen_sessionid(new);
990
991         INIT_LIST_HEAD(&new->se_conns);
992
993         new->se_cb_seq_nr = 1;
994         new->se_flags = cses->flags;
995         new->se_cb_prog = cses->callback_prog;
996         new->se_cb_sec = cses->cb_sec;
997         atomic_set(&new->se_ref, 0);
998         idx = hash_sessionid(&new->se_sessionid);
999         spin_lock(&nn->client_lock);
1000         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1001         spin_lock(&clp->cl_lock);
1002         list_add(&new->se_perclnt, &clp->cl_sessions);
1003         spin_unlock(&clp->cl_lock);
1004         spin_unlock(&nn->client_lock);
1005
1006         if (cses->flags & SESSION4_BACK_CHAN) {
1007                 struct sockaddr *sa = svc_addr(rqstp);
1008                 /*
1009                  * This is a little silly; with sessions there's no real
1010                  * use for the callback address.  Use the peer address
1011                  * as a reasonable default for now, but consider fixing
1012                  * the rpc client not to require an address in the
1013                  * future:
1014                  */
1015                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1016                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1017         }
1018 }
1019
1020 /* caller must hold client_lock */
1021 static struct nfsd4_session *
1022 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1023 {
1024         struct nfsd4_session *elem;
1025         int idx;
1026         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1027
1028         dump_sessionid(__func__, sessionid);
1029         idx = hash_sessionid(sessionid);
1030         /* Search in the appropriate list */
1031         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1032                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1033                             NFS4_MAX_SESSIONID_LEN)) {
1034                         return elem;
1035                 }
1036         }
1037
1038         dprintk("%s: session not found\n", __func__);
1039         return NULL;
1040 }
1041
1042 /* caller must hold client_lock */
1043 static void
1044 unhash_session(struct nfsd4_session *ses)
1045 {
1046         list_del(&ses->se_hash);
1047         spin_lock(&ses->se_client->cl_lock);
1048         list_del(&ses->se_perclnt);
1049         spin_unlock(&ses->se_client->cl_lock);
1050 }
1051
1052 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1053 static int
1054 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1055 {
1056         if (clid->cl_boot == nn->boot_time)
1057                 return 0;
1058         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1059                 clid->cl_boot, clid->cl_id, nn->boot_time);
1060         return 1;
1061 }
1062
1063 /* 
1064  * XXX Should we use a slab cache ?
1065  * This type of memory management is somewhat inefficient, but we use it
1066  * anyway since SETCLIENTID is not a common operation.
1067  */
1068 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1069 {
1070         struct nfs4_client *clp;
1071
1072         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1073         if (clp == NULL)
1074                 return NULL;
1075         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1076         if (clp->cl_name.data == NULL) {
1077                 kfree(clp);
1078                 return NULL;
1079         }
1080         clp->cl_name.len = name.len;
1081         INIT_LIST_HEAD(&clp->cl_sessions);
1082         idr_init(&clp->cl_stateids);
1083         atomic_set(&clp->cl_refcount, 0);
1084         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1085         INIT_LIST_HEAD(&clp->cl_idhash);
1086         INIT_LIST_HEAD(&clp->cl_openowners);
1087         INIT_LIST_HEAD(&clp->cl_delegations);
1088         INIT_LIST_HEAD(&clp->cl_lru);
1089         INIT_LIST_HEAD(&clp->cl_callbacks);
1090         INIT_LIST_HEAD(&clp->cl_revoked);
1091         spin_lock_init(&clp->cl_lock);
1092         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1093         return clp;
1094 }
1095
1096 static inline void
1097 free_client(struct nfs4_client *clp)
1098 {
1099         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1100
1101         lockdep_assert_held(&nn->client_lock);
1102         while (!list_empty(&clp->cl_sessions)) {
1103                 struct nfsd4_session *ses;
1104                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1105                                 se_perclnt);
1106                 list_del(&ses->se_perclnt);
1107                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1108                 free_session(ses);
1109         }
1110         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1111         free_svc_cred(&clp->cl_cred);
1112         kfree(clp->cl_name.data);
1113         idr_destroy(&clp->cl_stateids);
1114         kfree(clp);
1115 }
1116
1117 /* must be called under the client_lock */
1118 static inline void
1119 unhash_client_locked(struct nfs4_client *clp)
1120 {
1121         struct nfsd4_session *ses;
1122
1123         list_del(&clp->cl_lru);
1124         spin_lock(&clp->cl_lock);
1125         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1126                 list_del_init(&ses->se_hash);
1127         spin_unlock(&clp->cl_lock);
1128 }
1129
1130 static void
1131 destroy_client(struct nfs4_client *clp)
1132 {
1133         struct nfs4_openowner *oo;
1134         struct nfs4_delegation *dp;
1135         struct list_head reaplist;
1136         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1137
1138         INIT_LIST_HEAD(&reaplist);
1139         spin_lock(&recall_lock);
1140         while (!list_empty(&clp->cl_delegations)) {
1141                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1142                 list_del_init(&dp->dl_perclnt);
1143                 list_move(&dp->dl_recall_lru, &reaplist);
1144         }
1145         spin_unlock(&recall_lock);
1146         while (!list_empty(&reaplist)) {
1147                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1148                 destroy_delegation(dp);
1149         }
1150         list_splice_init(&clp->cl_revoked, &reaplist);
1151         while (!list_empty(&reaplist)) {
1152                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1153                 destroy_revoked_delegation(dp);
1154         }
1155         while (!list_empty(&clp->cl_openowners)) {
1156                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1157                 release_openowner(oo);
1158         }
1159         nfsd4_shutdown_callback(clp);
1160         if (clp->cl_cb_conn.cb_xprt)
1161                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1162         list_del(&clp->cl_idhash);
1163         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1164                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1165         else
1166                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1167         spin_lock(&nn->client_lock);
1168         unhash_client_locked(clp);
1169         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1170         free_client(clp);
1171         spin_unlock(&nn->client_lock);
1172 }
1173
1174 static void expire_client(struct nfs4_client *clp)
1175 {
1176         nfsd4_client_record_remove(clp);
1177         destroy_client(clp);
1178 }
1179
1180 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1181 {
1182         memcpy(target->cl_verifier.data, source->data,
1183                         sizeof(target->cl_verifier.data));
1184 }
1185
1186 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1187 {
1188         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1189         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1190 }
1191
1192 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1193 {
1194         if (source->cr_principal) {
1195                 target->cr_principal =
1196                                 kstrdup(source->cr_principal, GFP_KERNEL);
1197                 if (target->cr_principal == NULL)
1198                         return -ENOMEM;
1199         } else
1200                 target->cr_principal = NULL;
1201         target->cr_flavor = source->cr_flavor;
1202         target->cr_uid = source->cr_uid;
1203         target->cr_gid = source->cr_gid;
1204         target->cr_group_info = source->cr_group_info;
1205         get_group_info(target->cr_group_info);
1206         target->cr_gss_mech = source->cr_gss_mech;
1207         if (source->cr_gss_mech)
1208                 gss_mech_get(source->cr_gss_mech);
1209         return 0;
1210 }
1211
1212 static long long
1213 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1214 {
1215         long long res;
1216
1217         res = o1->len - o2->len;
1218         if (res)
1219                 return res;
1220         return (long long)memcmp(o1->data, o2->data, o1->len);
1221 }
1222
1223 static int same_name(const char *n1, const char *n2)
1224 {
1225         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1226 }
1227
1228 static int
1229 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1230 {
1231         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1232 }
1233
1234 static int
1235 same_clid(clientid_t *cl1, clientid_t *cl2)
1236 {
1237         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1238 }
1239
1240 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1241 {
1242         int i;
1243
1244         if (g1->ngroups != g2->ngroups)
1245                 return false;
1246         for (i=0; i<g1->ngroups; i++)
1247                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1248                         return false;
1249         return true;
1250 }
1251
1252 /*
1253  * RFC 3530 language requires clid_inuse be returned when the
1254  * "principal" associated with a requests differs from that previously
1255  * used.  We use uid, gid's, and gss principal string as our best
1256  * approximation.  We also don't want to allow non-gss use of a client
1257  * established using gss: in theory cr_principal should catch that
1258  * change, but in practice cr_principal can be null even in the gss case
1259  * since gssd doesn't always pass down a principal string.
1260  */
1261 static bool is_gss_cred(struct svc_cred *cr)
1262 {
1263         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1264         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1265 }
1266
1267
1268 static bool
1269 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1270 {
1271         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1272                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1273                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1274                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1275                 return false;
1276         if (cr1->cr_principal == cr2->cr_principal)
1277                 return true;
1278         if (!cr1->cr_principal || !cr2->cr_principal)
1279                 return false;
1280         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1281 }
1282
1283 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1284 {
1285         struct svc_cred *cr = &rqstp->rq_cred;
1286         u32 service;
1287
1288         if (!cr->cr_gss_mech)
1289                 return false;
1290         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1291         return service == RPC_GSS_SVC_INTEGRITY ||
1292                service == RPC_GSS_SVC_PRIVACY;
1293 }
1294
1295 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1296 {
1297         struct svc_cred *cr = &rqstp->rq_cred;
1298
1299         if (!cl->cl_mach_cred)
1300                 return true;
1301         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1302                 return false;
1303         if (!svc_rqst_integrity_protected(rqstp))
1304                 return false;
1305         if (!cr->cr_principal)
1306                 return false;
1307         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1308 }
1309
1310 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1311 {
1312         static u32 current_clientid = 1;
1313
1314         clp->cl_clientid.cl_boot = nn->boot_time;
1315         clp->cl_clientid.cl_id = current_clientid++; 
1316 }
1317
1318 static void gen_confirm(struct nfs4_client *clp)
1319 {
1320         __be32 verf[2];
1321         static u32 i;
1322
1323         verf[0] = (__be32)get_seconds();
1324         verf[1] = (__be32)i++;
1325         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1326 }
1327
1328 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1329 {
1330         struct nfs4_stid *ret;
1331
1332         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1333         if (!ret || !ret->sc_type)
1334                 return NULL;
1335         return ret;
1336 }
1337
1338 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1339 {
1340         struct nfs4_stid *s;
1341
1342         s = find_stateid(cl, t);
1343         if (!s)
1344                 return NULL;
1345         if (typemask & s->sc_type)
1346                 return s;
1347         return NULL;
1348 }
1349
1350 static struct nfs4_client *create_client(struct xdr_netobj name,
1351                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1352 {
1353         struct nfs4_client *clp;
1354         struct sockaddr *sa = svc_addr(rqstp);
1355         int ret;
1356         struct net *net = SVC_NET(rqstp);
1357         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1358
1359         clp = alloc_client(name);
1360         if (clp == NULL)
1361                 return NULL;
1362
1363         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1364         if (ret) {
1365                 spin_lock(&nn->client_lock);
1366                 free_client(clp);
1367                 spin_unlock(&nn->client_lock);
1368                 return NULL;
1369         }
1370         nfsd4_init_callback(&clp->cl_cb_null);
1371         clp->cl_time = get_seconds();
1372         clear_bit(0, &clp->cl_cb_slot_busy);
1373         copy_verf(clp, verf);
1374         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1375         gen_confirm(clp);
1376         clp->cl_cb_session = NULL;
1377         clp->net = net;
1378         return clp;
1379 }
1380
1381 static void
1382 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1383 {
1384         struct rb_node **new = &(root->rb_node), *parent = NULL;
1385         struct nfs4_client *clp;
1386
1387         while (*new) {
1388                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1389                 parent = *new;
1390
1391                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1392                         new = &((*new)->rb_left);
1393                 else
1394                         new = &((*new)->rb_right);
1395         }
1396
1397         rb_link_node(&new_clp->cl_namenode, parent, new);
1398         rb_insert_color(&new_clp->cl_namenode, root);
1399 }
1400
1401 static struct nfs4_client *
1402 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1403 {
1404         long long cmp;
1405         struct rb_node *node = root->rb_node;
1406         struct nfs4_client *clp;
1407
1408         while (node) {
1409                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1410                 cmp = compare_blob(&clp->cl_name, name);
1411                 if (cmp > 0)
1412                         node = node->rb_left;
1413                 else if (cmp < 0)
1414                         node = node->rb_right;
1415                 else
1416                         return clp;
1417         }
1418         return NULL;
1419 }
1420
1421 static void
1422 add_to_unconfirmed(struct nfs4_client *clp)
1423 {
1424         unsigned int idhashval;
1425         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1426
1427         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1428         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1429         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1430         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1431         renew_client(clp);
1432 }
1433
1434 static void
1435 move_to_confirmed(struct nfs4_client *clp)
1436 {
1437         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1438         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1439
1440         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1441         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1442         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1443         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1444         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1445         renew_client(clp);
1446 }
1447
1448 static struct nfs4_client *
1449 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1450 {
1451         struct nfs4_client *clp;
1452         unsigned int idhashval = clientid_hashval(clid->cl_id);
1453
1454         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1455                 if (same_clid(&clp->cl_clientid, clid)) {
1456                         if ((bool)clp->cl_minorversion != sessions)
1457                                 return NULL;
1458                         renew_client(clp);
1459                         return clp;
1460                 }
1461         }
1462         return NULL;
1463 }
1464
1465 static struct nfs4_client *
1466 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1467 {
1468         struct list_head *tbl = nn->conf_id_hashtbl;
1469
1470         return find_client_in_id_table(tbl, clid, sessions);
1471 }
1472
1473 static struct nfs4_client *
1474 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1475 {
1476         struct list_head *tbl = nn->unconf_id_hashtbl;
1477
1478         return find_client_in_id_table(tbl, clid, sessions);
1479 }
1480
1481 static bool clp_used_exchangeid(struct nfs4_client *clp)
1482 {
1483         return clp->cl_exchange_flags != 0;
1484
1485
1486 static struct nfs4_client *
1487 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1488 {
1489         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1490 }
1491
1492 static struct nfs4_client *
1493 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1494 {
1495         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1496 }
1497
1498 static void
1499 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1500 {
1501         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1502         struct sockaddr *sa = svc_addr(rqstp);
1503         u32 scopeid = rpc_get_scope_id(sa);
1504         unsigned short expected_family;
1505
1506         /* Currently, we only support tcp and tcp6 for the callback channel */
1507         if (se->se_callback_netid_len == 3 &&
1508             !memcmp(se->se_callback_netid_val, "tcp", 3))
1509                 expected_family = AF_INET;
1510         else if (se->se_callback_netid_len == 4 &&
1511                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1512                 expected_family = AF_INET6;
1513         else
1514                 goto out_err;
1515
1516         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1517                                             se->se_callback_addr_len,
1518                                             (struct sockaddr *)&conn->cb_addr,
1519                                             sizeof(conn->cb_addr));
1520
1521         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1522                 goto out_err;
1523
1524         if (conn->cb_addr.ss_family == AF_INET6)
1525                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1526
1527         conn->cb_prog = se->se_callback_prog;
1528         conn->cb_ident = se->se_callback_ident;
1529         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1530         return;
1531 out_err:
1532         conn->cb_addr.ss_family = AF_UNSPEC;
1533         conn->cb_addrlen = 0;
1534         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1535                 "will not receive delegations\n",
1536                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1537
1538         return;
1539 }
1540
1541 /*
1542  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1543  */
1544 void
1545 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1546 {
1547         struct nfsd4_slot *slot = resp->cstate.slot;
1548         unsigned int base;
1549
1550         dprintk("--> %s slot %p\n", __func__, slot);
1551
1552         slot->sl_opcnt = resp->opcnt;
1553         slot->sl_status = resp->cstate.status;
1554
1555         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1556         if (nfsd4_not_cached(resp)) {
1557                 slot->sl_datalen = 0;
1558                 return;
1559         }
1560         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1561         base = (char *)resp->cstate.datap -
1562                                         (char *)resp->xbuf->head[0].iov_base;
1563         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1564                                     slot->sl_datalen))
1565                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1566         return;
1567 }
1568
1569 /*
1570  * Encode the replay sequence operation from the slot values.
1571  * If cachethis is FALSE encode the uncached rep error on the next
1572  * operation which sets resp->p and increments resp->opcnt for
1573  * nfs4svc_encode_compoundres.
1574  *
1575  */
1576 static __be32
1577 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1578                           struct nfsd4_compoundres *resp)
1579 {
1580         struct nfsd4_op *op;
1581         struct nfsd4_slot *slot = resp->cstate.slot;
1582
1583         /* Encode the replayed sequence operation */
1584         op = &args->ops[resp->opcnt - 1];
1585         nfsd4_encode_operation(resp, op);
1586
1587         /* Return nfserr_retry_uncached_rep in next operation. */
1588         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1589                 op = &args->ops[resp->opcnt++];
1590                 op->status = nfserr_retry_uncached_rep;
1591                 nfsd4_encode_operation(resp, op);
1592         }
1593         return op->status;
1594 }
1595
1596 /*
1597  * The sequence operation is not cached because we can use the slot and
1598  * session values.
1599  */
1600 static __be32
1601 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1602                          struct nfsd4_sequence *seq)
1603 {
1604         struct nfsd4_slot *slot = resp->cstate.slot;
1605         __be32 status;
1606
1607         dprintk("--> %s slot %p\n", __func__, slot);
1608
1609         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1610         if (status)
1611                 return status;
1612
1613         /* The sequence operation has been encoded, cstate->datap set. */
1614         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1615
1616         resp->opcnt = slot->sl_opcnt;
1617         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1618         status = slot->sl_status;
1619
1620         return status;
1621 }
1622
1623 /*
1624  * Set the exchange_id flags returned by the server.
1625  */
1626 static void
1627 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1628 {
1629         /* pNFS is not supported */
1630         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1631
1632         /* Referrals are supported, Migration is not. */
1633         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1634
1635         /* set the wire flags to return to client. */
1636         clid->flags = new->cl_exchange_flags;
1637 }
1638
1639 static bool client_has_state(struct nfs4_client *clp)
1640 {
1641         /*
1642          * Note clp->cl_openowners check isn't quite right: there's no
1643          * need to count owners without stateid's.
1644          *
1645          * Also note we should probably be using this in 4.0 case too.
1646          */
1647         return !list_empty(&clp->cl_openowners)
1648                 || !list_empty(&clp->cl_delegations)
1649                 || !list_empty(&clp->cl_sessions);
1650 }
1651
1652 __be32
1653 nfsd4_exchange_id(struct svc_rqst *rqstp,
1654                   struct nfsd4_compound_state *cstate,
1655                   struct nfsd4_exchange_id *exid)
1656 {
1657         struct nfs4_client *unconf, *conf, *new;
1658         __be32 status;
1659         char                    addr_str[INET6_ADDRSTRLEN];
1660         nfs4_verifier           verf = exid->verifier;
1661         struct sockaddr         *sa = svc_addr(rqstp);
1662         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1663         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1664
1665         rpc_ntop(sa, addr_str, sizeof(addr_str));
1666         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1667                 "ip_addr=%s flags %x, spa_how %d\n",
1668                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1669                 addr_str, exid->flags, exid->spa_how);
1670
1671         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1672                 return nfserr_inval;
1673
1674         switch (exid->spa_how) {
1675         case SP4_MACH_CRED:
1676                 if (!svc_rqst_integrity_protected(rqstp))
1677                         return nfserr_inval;
1678         case SP4_NONE:
1679                 break;
1680         default:                                /* checked by xdr code */
1681                 WARN_ON_ONCE(1);
1682         case SP4_SSV:
1683                 return nfserr_encr_alg_unsupp;
1684         }
1685
1686         /* Cases below refer to rfc 5661 section 18.35.4: */
1687         nfs4_lock_state();
1688         conf = find_confirmed_client_by_name(&exid->clname, nn);
1689         if (conf) {
1690                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1691                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1692
1693                 if (update) {
1694                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1695                                 status = nfserr_inval;
1696                                 goto out;
1697                         }
1698                         if (!mach_creds_match(conf, rqstp)) {
1699                                 status = nfserr_wrong_cred;
1700                                 goto out;
1701                         }
1702                         if (!creds_match) { /* case 9 */
1703                                 status = nfserr_perm;
1704                                 goto out;
1705                         }
1706                         if (!verfs_match) { /* case 8 */
1707                                 status = nfserr_not_same;
1708                                 goto out;
1709                         }
1710                         /* case 6 */
1711                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1712                         new = conf;
1713                         goto out_copy;
1714                 }
1715                 if (!creds_match) { /* case 3 */
1716                         if (client_has_state(conf)) {
1717                                 status = nfserr_clid_inuse;
1718                                 goto out;
1719                         }
1720                         expire_client(conf);
1721                         goto out_new;
1722                 }
1723                 if (verfs_match) { /* case 2 */
1724                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1725                         new = conf;
1726                         goto out_copy;
1727                 }
1728                 /* case 5, client reboot */
1729                 goto out_new;
1730         }
1731
1732         if (update) { /* case 7 */
1733                 status = nfserr_noent;
1734                 goto out;
1735         }
1736
1737         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1738         if (unconf) /* case 4, possible retry or client restart */
1739                 expire_client(unconf);
1740
1741         /* case 1 (normal case) */
1742 out_new:
1743         new = create_client(exid->clname, rqstp, &verf);
1744         if (new == NULL) {
1745                 status = nfserr_jukebox;
1746                 goto out;
1747         }
1748         new->cl_minorversion = cstate->minorversion;
1749         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1750
1751         gen_clid(new, nn);
1752         add_to_unconfirmed(new);
1753 out_copy:
1754         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1755         exid->clientid.cl_id = new->cl_clientid.cl_id;
1756
1757         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1758         nfsd4_set_ex_flags(new, exid);
1759
1760         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1761                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1762         status = nfs_ok;
1763
1764 out:
1765         nfs4_unlock_state();
1766         return status;
1767 }
1768
1769 static __be32
1770 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1771 {
1772         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1773                 slot_seqid);
1774
1775         /* The slot is in use, and no response has been sent. */
1776         if (slot_inuse) {
1777                 if (seqid == slot_seqid)
1778                         return nfserr_jukebox;
1779                 else
1780                         return nfserr_seq_misordered;
1781         }
1782         /* Note unsigned 32-bit arithmetic handles wraparound: */
1783         if (likely(seqid == slot_seqid + 1))
1784                 return nfs_ok;
1785         if (seqid == slot_seqid)
1786                 return nfserr_replay_cache;
1787         return nfserr_seq_misordered;
1788 }
1789
1790 /*
1791  * Cache the create session result into the create session single DRC
1792  * slot cache by saving the xdr structure. sl_seqid has been set.
1793  * Do this for solo or embedded create session operations.
1794  */
1795 static void
1796 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1797                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1798 {
1799         slot->sl_status = nfserr;
1800         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1801 }
1802
1803 static __be32
1804 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1805                             struct nfsd4_clid_slot *slot)
1806 {
1807         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1808         return slot->sl_status;
1809 }
1810
1811 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1812                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1813                         1 +     /* MIN tag is length with zero, only length */ \
1814                         3 +     /* version, opcount, opcode */ \
1815                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1816                                 /* seqid, slotID, slotID, cache */ \
1817                         4 ) * sizeof(__be32))
1818
1819 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1820                         2 +     /* verifier: AUTH_NULL, length 0 */\
1821                         1 +     /* status */ \
1822                         1 +     /* MIN tag is length with zero, only length */ \
1823                         3 +     /* opcount, opcode, opstatus*/ \
1824                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1825                                 /* seqid, slotID, slotID, slotID, status */ \
1826                         5 ) * sizeof(__be32))
1827
1828 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1829 {
1830         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1831
1832         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1833                 return nfserr_toosmall;
1834         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1835                 return nfserr_toosmall;
1836         ca->headerpadsz = 0;
1837         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1838         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1839         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1840         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1841                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1842         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1843         /*
1844          * Note decreasing slot size below client's request may make it
1845          * difficult for client to function correctly, whereas
1846          * decreasing the number of slots will (just?) affect
1847          * performance.  When short on memory we therefore prefer to
1848          * decrease number of slots instead of their size.  Clients that
1849          * request larger slots than they need will get poor results:
1850          */
1851         ca->maxreqs = nfsd4_get_drc_mem(ca);
1852         if (!ca->maxreqs)
1853                 return nfserr_jukebox;
1854
1855         return nfs_ok;
1856 }
1857
1858 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
1859                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1860 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
1861                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
1862
1863 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1864 {
1865         ca->headerpadsz = 0;
1866
1867         /*
1868          * These RPC_MAX_HEADER macros are overkill, especially since we
1869          * don't even do gss on the backchannel yet.  But this is still
1870          * less than 1k.  Tighten up this estimate in the unlikely event
1871          * it turns out to be a problem for some client:
1872          */
1873         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1874                 return nfserr_toosmall;
1875         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1876                 return nfserr_toosmall;
1877         ca->maxresp_cached = 0;
1878         if (ca->maxops < 2)
1879                 return nfserr_toosmall;
1880
1881         return nfs_ok;
1882 }
1883
1884 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1885 {
1886         switch (cbs->flavor) {
1887         case RPC_AUTH_NULL:
1888         case RPC_AUTH_UNIX:
1889                 return nfs_ok;
1890         default:
1891                 /*
1892                  * GSS case: the spec doesn't allow us to return this
1893                  * error.  But it also doesn't allow us not to support
1894                  * GSS.
1895                  * I'd rather this fail hard than return some error the
1896                  * client might think it can already handle:
1897                  */
1898                 return nfserr_encr_alg_unsupp;
1899         }
1900 }
1901
1902 __be32
1903 nfsd4_create_session(struct svc_rqst *rqstp,
1904                      struct nfsd4_compound_state *cstate,
1905                      struct nfsd4_create_session *cr_ses)
1906 {
1907         struct sockaddr *sa = svc_addr(rqstp);
1908         struct nfs4_client *conf, *unconf;
1909         struct nfsd4_session *new;
1910         struct nfsd4_conn *conn;
1911         struct nfsd4_clid_slot *cs_slot = NULL;
1912         __be32 status = 0;
1913         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1914
1915         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1916                 return nfserr_inval;
1917         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1918         if (status)
1919                 return status;
1920         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1921         if (status)
1922                 return status;
1923         status = check_backchannel_attrs(&cr_ses->back_channel);
1924         if (status)
1925                 goto out_release_drc_mem;
1926         status = nfserr_jukebox;
1927         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
1928         if (!new)
1929                 goto out_release_drc_mem;
1930         conn = alloc_conn_from_crses(rqstp, cr_ses);
1931         if (!conn)
1932                 goto out_free_session;
1933
1934         nfs4_lock_state();
1935         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1936         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1937         WARN_ON_ONCE(conf && unconf);
1938
1939         if (conf) {
1940                 status = nfserr_wrong_cred;
1941                 if (!mach_creds_match(conf, rqstp))
1942                         goto out_free_conn;
1943                 cs_slot = &conf->cl_cs_slot;
1944                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1945                 if (status == nfserr_replay_cache) {
1946                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1947                         goto out_free_conn;
1948                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1949                         status = nfserr_seq_misordered;
1950                         goto out_free_conn;
1951                 }
1952         } else if (unconf) {
1953                 struct nfs4_client *old;
1954                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1955                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1956                         status = nfserr_clid_inuse;
1957                         goto out_free_conn;
1958                 }
1959                 status = nfserr_wrong_cred;
1960                 if (!mach_creds_match(unconf, rqstp))
1961                         goto out_free_conn;
1962                 cs_slot = &unconf->cl_cs_slot;
1963                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1964                 if (status) {
1965                         /* an unconfirmed replay returns misordered */
1966                         status = nfserr_seq_misordered;
1967                         goto out_free_conn;
1968                 }
1969                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1970                 if (old) {
1971                         status = mark_client_expired(old);
1972                         if (status)
1973                                 goto out_free_conn;
1974                         expire_client(old);
1975                 }
1976                 move_to_confirmed(unconf);
1977                 conf = unconf;
1978         } else {
1979                 status = nfserr_stale_clientid;
1980                 goto out_free_conn;
1981         }
1982         status = nfs_ok;
1983         /*
1984          * We do not support RDMA or persistent sessions
1985          */
1986         cr_ses->flags &= ~SESSION4_PERSIST;
1987         cr_ses->flags &= ~SESSION4_RDMA;
1988
1989         init_session(rqstp, new, conf, cr_ses);
1990         nfsd4_init_conn(rqstp, conn, new);
1991
1992         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1993                NFS4_MAX_SESSIONID_LEN);
1994         cs_slot->sl_seqid++;
1995         cr_ses->seqid = cs_slot->sl_seqid;
1996
1997         /* cache solo and embedded create sessions under the state lock */
1998         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1999         nfs4_unlock_state();
2000         return status;
2001 out_free_conn:
2002         nfs4_unlock_state();
2003         free_conn(conn);
2004 out_free_session:
2005         __free_session(new);
2006 out_release_drc_mem:
2007         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2008         return status;
2009 }
2010
2011 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2012 {
2013         switch (*dir) {
2014         case NFS4_CDFC4_FORE:
2015         case NFS4_CDFC4_BACK:
2016                 return nfs_ok;
2017         case NFS4_CDFC4_FORE_OR_BOTH:
2018         case NFS4_CDFC4_BACK_OR_BOTH:
2019                 *dir = NFS4_CDFC4_BOTH;
2020                 return nfs_ok;
2021         };
2022         return nfserr_inval;
2023 }
2024
2025 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2026 {
2027         struct nfsd4_session *session = cstate->session;
2028         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2029         __be32 status;
2030
2031         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2032         if (status)
2033                 return status;
2034         spin_lock(&nn->client_lock);
2035         session->se_cb_prog = bc->bc_cb_program;
2036         session->se_cb_sec = bc->bc_cb_sec;
2037         spin_unlock(&nn->client_lock);
2038
2039         nfsd4_probe_callback(session->se_client);
2040
2041         return nfs_ok;
2042 }
2043
2044 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2045                      struct nfsd4_compound_state *cstate,
2046                      struct nfsd4_bind_conn_to_session *bcts)
2047 {
2048         __be32 status;
2049         struct nfsd4_conn *conn;
2050         struct nfsd4_session *session;
2051         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2052
2053         if (!nfsd4_last_compound_op(rqstp))
2054                 return nfserr_not_only_op;
2055         nfs4_lock_state();
2056         spin_lock(&nn->client_lock);
2057         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2058         spin_unlock(&nn->client_lock);
2059         status = nfserr_badsession;
2060         if (!session)
2061                 goto out;
2062         status = nfserr_wrong_cred;
2063         if (!mach_creds_match(session->se_client, rqstp))
2064                 goto out;
2065         status = nfsd4_map_bcts_dir(&bcts->dir);
2066         if (status)
2067                 goto out;
2068         conn = alloc_conn(rqstp, bcts->dir);
2069         status = nfserr_jukebox;
2070         if (!conn)
2071                 goto out;
2072         nfsd4_init_conn(rqstp, conn, session);
2073         status = nfs_ok;
2074 out:
2075         nfs4_unlock_state();
2076         return status;
2077 }
2078
2079 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2080 {
2081         if (!session)
2082                 return 0;
2083         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2084 }
2085
2086 __be32
2087 nfsd4_destroy_session(struct svc_rqst *r,
2088                       struct nfsd4_compound_state *cstate,
2089                       struct nfsd4_destroy_session *sessionid)
2090 {
2091         struct nfsd4_session *ses;
2092         __be32 status;
2093         int ref_held_by_me = 0;
2094         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2095
2096         nfs4_lock_state();
2097         status = nfserr_not_only_op;
2098         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2099                 if (!nfsd4_last_compound_op(r))
2100                         goto out;
2101                 ref_held_by_me++;
2102         }
2103         dump_sessionid(__func__, &sessionid->sessionid);
2104         spin_lock(&nn->client_lock);
2105         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2106         status = nfserr_badsession;
2107         if (!ses)
2108                 goto out_client_lock;
2109         status = nfserr_wrong_cred;
2110         if (!mach_creds_match(ses->se_client, r))
2111                 goto out_client_lock;
2112         nfsd4_get_session_locked(ses);
2113         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2114         if (status)
2115                 goto out_put_session;
2116         unhash_session(ses);
2117         spin_unlock(&nn->client_lock);
2118
2119         nfsd4_probe_callback_sync(ses->se_client);
2120
2121         spin_lock(&nn->client_lock);
2122         status = nfs_ok;
2123 out_put_session:
2124         nfsd4_put_session(ses);
2125 out_client_lock:
2126         spin_unlock(&nn->client_lock);
2127 out:
2128         nfs4_unlock_state();
2129         return status;
2130 }
2131
2132 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2133 {
2134         struct nfsd4_conn *c;
2135
2136         list_for_each_entry(c, &s->se_conns, cn_persession) {
2137                 if (c->cn_xprt == xpt) {
2138                         return c;
2139                 }
2140         }
2141         return NULL;
2142 }
2143
2144 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2145 {
2146         struct nfs4_client *clp = ses->se_client;
2147         struct nfsd4_conn *c;
2148         __be32 status = nfs_ok;
2149         int ret;
2150
2151         spin_lock(&clp->cl_lock);
2152         c = __nfsd4_find_conn(new->cn_xprt, ses);
2153         if (c)
2154                 goto out_free;
2155         status = nfserr_conn_not_bound_to_session;
2156         if (clp->cl_mach_cred)
2157                 goto out_free;
2158         __nfsd4_hash_conn(new, ses);
2159         spin_unlock(&clp->cl_lock);
2160         ret = nfsd4_register_conn(new);
2161         if (ret)
2162                 /* oops; xprt is already down: */
2163                 nfsd4_conn_lost(&new->cn_xpt_user);
2164         return nfs_ok;
2165 out_free:
2166         spin_unlock(&clp->cl_lock);
2167         free_conn(new);
2168         return status;
2169 }
2170
2171 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2172 {
2173         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2174
2175         return args->opcnt > session->se_fchannel.maxops;
2176 }
2177
2178 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2179                                   struct nfsd4_session *session)
2180 {
2181         struct xdr_buf *xb = &rqstp->rq_arg;
2182
2183         return xb->len > session->se_fchannel.maxreq_sz;
2184 }
2185
2186 __be32
2187 nfsd4_sequence(struct svc_rqst *rqstp,
2188                struct nfsd4_compound_state *cstate,
2189                struct nfsd4_sequence *seq)
2190 {
2191         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2192         struct nfsd4_session *session;
2193         struct nfs4_client *clp;
2194         struct nfsd4_slot *slot;
2195         struct nfsd4_conn *conn;
2196         __be32 status;
2197         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2198
2199         if (resp->opcnt != 1)
2200                 return nfserr_sequence_pos;
2201
2202         /*
2203          * Will be either used or freed by nfsd4_sequence_check_conn
2204          * below.
2205          */
2206         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2207         if (!conn)
2208                 return nfserr_jukebox;
2209
2210         spin_lock(&nn->client_lock);
2211         status = nfserr_badsession;
2212         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2213         if (!session)
2214                 goto out_no_session;
2215         clp = session->se_client;
2216         status = get_client_locked(clp);
2217         if (status)
2218                 goto out_no_session;
2219         status = nfsd4_get_session_locked(session);
2220         if (status)
2221                 goto out_put_client;
2222
2223         status = nfserr_too_many_ops;
2224         if (nfsd4_session_too_many_ops(rqstp, session))
2225                 goto out_put_session;
2226
2227         status = nfserr_req_too_big;
2228         if (nfsd4_request_too_big(rqstp, session))
2229                 goto out_put_session;
2230
2231         status = nfserr_badslot;
2232         if (seq->slotid >= session->se_fchannel.maxreqs)
2233                 goto out_put_session;
2234
2235         slot = session->se_slots[seq->slotid];
2236         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2237
2238         /* We do not negotiate the number of slots yet, so set the
2239          * maxslots to the session maxreqs which is used to encode
2240          * sr_highest_slotid and the sr_target_slot id to maxslots */
2241         seq->maxslots = session->se_fchannel.maxreqs;
2242
2243         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2244                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2245         if (status == nfserr_replay_cache) {
2246                 status = nfserr_seq_misordered;
2247                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2248                         goto out_put_session;
2249                 cstate->slot = slot;
2250                 cstate->session = session;
2251                 /* Return the cached reply status and set cstate->status
2252                  * for nfsd4_proc_compound processing */
2253                 status = nfsd4_replay_cache_entry(resp, seq);
2254                 cstate->status = nfserr_replay_cache;
2255                 goto out;
2256         }
2257         if (status)
2258                 goto out_put_session;
2259
2260         status = nfsd4_sequence_check_conn(conn, session);
2261         conn = NULL;
2262         if (status)
2263                 goto out_put_session;
2264
2265         /* Success! bump slot seqid */
2266         slot->sl_seqid = seq->seqid;
2267         slot->sl_flags |= NFSD4_SLOT_INUSE;
2268         if (seq->cachethis)
2269                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2270         else
2271                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2272
2273         cstate->slot = slot;
2274         cstate->session = session;
2275
2276 out:
2277         switch (clp->cl_cb_state) {
2278         case NFSD4_CB_DOWN:
2279                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2280                 break;
2281         case NFSD4_CB_FAULT:
2282                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2283                 break;
2284         default:
2285                 seq->status_flags = 0;
2286         }
2287         if (!list_empty(&clp->cl_revoked))
2288                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2289 out_no_session:
2290         if (conn)
2291                 free_conn(conn);
2292         spin_unlock(&nn->client_lock);
2293         return status;
2294 out_put_session:
2295         nfsd4_put_session(session);
2296 out_put_client:
2297         put_client_renew_locked(clp);
2298         goto out_no_session;
2299 }
2300
2301 __be32
2302 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2303 {
2304         struct nfs4_client *conf, *unconf, *clp;
2305         __be32 status = 0;
2306         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2307
2308         nfs4_lock_state();
2309         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2310         conf = find_confirmed_client(&dc->clientid, true, nn);
2311         WARN_ON_ONCE(conf && unconf);
2312
2313         if (conf) {
2314                 clp = conf;
2315
2316                 if (client_has_state(conf)) {
2317                         status = nfserr_clientid_busy;
2318                         goto out;
2319                 }
2320         } else if (unconf)
2321                 clp = unconf;
2322         else {
2323                 status = nfserr_stale_clientid;
2324                 goto out;
2325         }
2326         if (!mach_creds_match(clp, rqstp)) {
2327                 status = nfserr_wrong_cred;
2328                 goto out;
2329         }
2330         expire_client(clp);
2331 out:
2332         nfs4_unlock_state();
2333         return status;
2334 }
2335
2336 __be32
2337 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2338 {
2339         __be32 status = 0;
2340
2341         if (rc->rca_one_fs) {
2342                 if (!cstate->current_fh.fh_dentry)
2343                         return nfserr_nofilehandle;
2344                 /*
2345                  * We don't take advantage of the rca_one_fs case.
2346                  * That's OK, it's optional, we can safely ignore it.
2347                  */
2348                  return nfs_ok;
2349         }
2350
2351         nfs4_lock_state();
2352         status = nfserr_complete_already;
2353         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2354                              &cstate->session->se_client->cl_flags))
2355                 goto out;
2356
2357         status = nfserr_stale_clientid;
2358         if (is_client_expired(cstate->session->se_client))
2359                 /*
2360                  * The following error isn't really legal.
2361                  * But we only get here if the client just explicitly
2362                  * destroyed the client.  Surely it no longer cares what
2363                  * error it gets back on an operation for the dead
2364                  * client.
2365                  */
2366                 goto out;
2367
2368         status = nfs_ok;
2369         nfsd4_client_record_create(cstate->session->se_client);
2370 out:
2371         nfs4_unlock_state();
2372         return status;
2373 }
2374
2375 __be32
2376 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2377                   struct nfsd4_setclientid *setclid)
2378 {
2379         struct xdr_netobj       clname = setclid->se_name;
2380         nfs4_verifier           clverifier = setclid->se_verf;
2381         struct nfs4_client      *conf, *unconf, *new;
2382         __be32                  status;
2383         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2384
2385         /* Cases below refer to rfc 3530 section 14.2.33: */
2386         nfs4_lock_state();
2387         conf = find_confirmed_client_by_name(&clname, nn);
2388         if (conf) {
2389                 /* case 0: */
2390                 status = nfserr_clid_inuse;
2391                 if (clp_used_exchangeid(conf))
2392                         goto out;
2393                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2394                         char addr_str[INET6_ADDRSTRLEN];
2395                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2396                                  sizeof(addr_str));
2397                         dprintk("NFSD: setclientid: string in use by client "
2398                                 "at %s\n", addr_str);
2399                         goto out;
2400                 }
2401         }
2402         unconf = find_unconfirmed_client_by_name(&clname, nn);
2403         if (unconf)
2404                 expire_client(unconf);
2405         status = nfserr_jukebox;
2406         new = create_client(clname, rqstp, &clverifier);
2407         if (new == NULL)
2408                 goto out;
2409         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2410                 /* case 1: probable callback update */
2411                 copy_clid(new, conf);
2412         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2413                 gen_clid(new, nn);
2414         new->cl_minorversion = 0;
2415         gen_callback(new, setclid, rqstp);
2416         add_to_unconfirmed(new);
2417         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2418         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2419         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2420         status = nfs_ok;
2421 out:
2422         nfs4_unlock_state();
2423         return status;
2424 }
2425
2426
2427 __be32
2428 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2429                          struct nfsd4_compound_state *cstate,
2430                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2431 {
2432         struct nfs4_client *conf, *unconf;
2433         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
2434         clientid_t * clid = &setclientid_confirm->sc_clientid;
2435         __be32 status;
2436         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2437
2438         if (STALE_CLIENTID(clid, nn))
2439                 return nfserr_stale_clientid;
2440         nfs4_lock_state();
2441
2442         conf = find_confirmed_client(clid, false, nn);
2443         unconf = find_unconfirmed_client(clid, false, nn);
2444         /*
2445          * We try hard to give out unique clientid's, so if we get an
2446          * attempt to confirm the same clientid with a different cred,
2447          * there's a bug somewhere.  Let's charitably assume it's our
2448          * bug.
2449          */
2450         status = nfserr_serverfault;
2451         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2452                 goto out;
2453         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2454                 goto out;
2455         /* cases below refer to rfc 3530 section 14.2.34: */
2456         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2457                 if (conf && !unconf) /* case 2: probable retransmit */
2458                         status = nfs_ok;
2459                 else /* case 4: client hasn't noticed we rebooted yet? */
2460                         status = nfserr_stale_clientid;
2461                 goto out;
2462         }
2463         status = nfs_ok;
2464         if (conf) { /* case 1: callback update */
2465                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2466                 nfsd4_probe_callback(conf);
2467                 expire_client(unconf);
2468         } else { /* case 3: normal case; new or rebooted client */
2469                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2470                 if (conf) {
2471                         status = mark_client_expired(conf);
2472                         if (status)
2473                                 goto out;
2474                         expire_client(conf);
2475                 }
2476                 move_to_confirmed(unconf);
2477                 nfsd4_probe_callback(unconf);
2478         }
2479 out:
2480         nfs4_unlock_state();
2481         return status;
2482 }
2483
2484 static struct nfs4_file *nfsd4_alloc_file(void)
2485 {
2486         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2487 }
2488
2489 /* OPEN Share state helper functions */
2490 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2491 {
2492         unsigned int hashval = file_hashval(ino);
2493
2494         atomic_set(&fp->fi_ref, 1);
2495         INIT_LIST_HEAD(&fp->fi_stateids);
2496         INIT_LIST_HEAD(&fp->fi_delegations);
2497         fp->fi_inode = igrab(ino);
2498         fp->fi_had_conflict = false;
2499         fp->fi_lease = NULL;
2500         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2501         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2502         spin_lock(&recall_lock);
2503         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2504         spin_unlock(&recall_lock);
2505 }
2506
2507 static void
2508 nfsd4_free_slab(struct kmem_cache **slab)
2509 {
2510         if (*slab == NULL)
2511                 return;
2512         kmem_cache_destroy(*slab);
2513         *slab = NULL;
2514 }
2515
2516 void
2517 nfsd4_free_slabs(void)
2518 {
2519         nfsd4_free_slab(&openowner_slab);
2520         nfsd4_free_slab(&lockowner_slab);
2521         nfsd4_free_slab(&file_slab);
2522         nfsd4_free_slab(&stateid_slab);
2523         nfsd4_free_slab(&deleg_slab);
2524 }
2525
2526 int
2527 nfsd4_init_slabs(void)
2528 {
2529         openowner_slab = kmem_cache_create("nfsd4_openowners",
2530                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2531         if (openowner_slab == NULL)
2532                 goto out_nomem;
2533         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2534                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2535         if (lockowner_slab == NULL)
2536                 goto out_nomem;
2537         file_slab = kmem_cache_create("nfsd4_files",
2538                         sizeof(struct nfs4_file), 0, 0, NULL);
2539         if (file_slab == NULL)
2540                 goto out_nomem;
2541         stateid_slab = kmem_cache_create("nfsd4_stateids",
2542                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2543         if (stateid_slab == NULL)
2544                 goto out_nomem;
2545         deleg_slab = kmem_cache_create("nfsd4_delegations",
2546                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2547         if (deleg_slab == NULL)
2548                 goto out_nomem;
2549         return 0;
2550 out_nomem:
2551         nfsd4_free_slabs();
2552         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2553         return -ENOMEM;
2554 }
2555
2556 void nfs4_free_openowner(struct nfs4_openowner *oo)
2557 {
2558         kfree(oo->oo_owner.so_owner.data);
2559         kmem_cache_free(openowner_slab, oo);
2560 }
2561
2562 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2563 {
2564         kfree(lo->lo_owner.so_owner.data);
2565         kmem_cache_free(lockowner_slab, lo);
2566 }
2567
2568 static void init_nfs4_replay(struct nfs4_replay *rp)
2569 {
2570         rp->rp_status = nfserr_serverfault;
2571         rp->rp_buflen = 0;
2572         rp->rp_buf = rp->rp_ibuf;
2573 }
2574
2575 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2576 {
2577         struct nfs4_stateowner *sop;
2578
2579         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2580         if (!sop)
2581                 return NULL;
2582
2583         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2584         if (!sop->so_owner.data) {
2585                 kmem_cache_free(slab, sop);
2586                 return NULL;
2587         }
2588         sop->so_owner.len = owner->len;
2589
2590         INIT_LIST_HEAD(&sop->so_stateids);
2591         sop->so_client = clp;
2592         init_nfs4_replay(&sop->so_replay);
2593         return sop;
2594 }
2595
2596 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2597 {
2598         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2599
2600         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2601         list_add(&oo->oo_perclient, &clp->cl_openowners);
2602 }
2603
2604 static struct nfs4_openowner *
2605 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2606         struct nfs4_openowner *oo;
2607
2608         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2609         if (!oo)
2610                 return NULL;
2611         oo->oo_owner.so_is_open_owner = 1;
2612         oo->oo_owner.so_seqid = open->op_seqid;
2613         oo->oo_flags = NFS4_OO_NEW;
2614         oo->oo_time = 0;
2615         oo->oo_last_closed_stid = NULL;
2616         INIT_LIST_HEAD(&oo->oo_close_lru);
2617         hash_openowner(oo, clp, strhashval);
2618         return oo;
2619 }
2620
2621 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2622         struct nfs4_openowner *oo = open->op_openowner;
2623
2624         stp->st_stid.sc_type = NFS4_OPEN_STID;
2625         INIT_LIST_HEAD(&stp->st_lockowners);
2626         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2627         list_add(&stp->st_perfile, &fp->fi_stateids);
2628         stp->st_stateowner = &oo->oo_owner;
2629         get_nfs4_file(fp);
2630         stp->st_file = fp;
2631         stp->st_access_bmap = 0;
2632         stp->st_deny_bmap = 0;
2633         set_access(open->op_share_access, stp);
2634         set_deny(open->op_share_deny, stp);
2635         stp->st_openstp = NULL;
2636 }
2637
2638 static void
2639 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2640 {
2641         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2642
2643         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2644
2645         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2646         oo->oo_time = get_seconds();
2647 }
2648
2649 static int
2650 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2651                                                         clientid_t *clid)
2652 {
2653         return (sop->so_owner.len == owner->len) &&
2654                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2655                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2656 }
2657
2658 static struct nfs4_openowner *
2659 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2660                         bool sessions, struct nfsd_net *nn)
2661 {
2662         struct nfs4_stateowner *so;
2663         struct nfs4_openowner *oo;
2664         struct nfs4_client *clp;
2665
2666         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2667                 if (!so->so_is_open_owner)
2668                         continue;
2669                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2670                         oo = openowner(so);
2671                         clp = oo->oo_owner.so_client;
2672                         if ((bool)clp->cl_minorversion != sessions)
2673                                 return NULL;
2674                         renew_client(oo->oo_owner.so_client);
2675                         return oo;
2676                 }
2677         }
2678         return NULL;
2679 }
2680
2681 /* search file_hashtbl[] for file */
2682 static struct nfs4_file *
2683 find_file(struct inode *ino)
2684 {
2685         unsigned int hashval = file_hashval(ino);
2686         struct nfs4_file *fp;
2687
2688         spin_lock(&recall_lock);
2689         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2690                 if (fp->fi_inode == ino) {
2691                         get_nfs4_file(fp);
2692                         spin_unlock(&recall_lock);
2693                         return fp;
2694                 }
2695         }
2696         spin_unlock(&recall_lock);
2697         return NULL;
2698 }
2699
2700 /*
2701  * Called to check deny when READ with all zero stateid or
2702  * WRITE with all zero or all one stateid
2703  */
2704 static __be32
2705 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2706 {
2707         struct inode *ino = current_fh->fh_dentry->d_inode;
2708         struct nfs4_file *fp;
2709         struct nfs4_ol_stateid *stp;
2710         __be32 ret;
2711
2712         fp = find_file(ino);
2713         if (!fp)
2714                 return nfs_ok;
2715         ret = nfserr_locked;
2716         /* Search for conflicting share reservations */
2717         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2718                 if (test_deny(deny_type, stp) ||
2719                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2720                         goto out;
2721         }
2722         ret = nfs_ok;
2723 out:
2724         put_nfs4_file(fp);
2725         return ret;
2726 }
2727
2728 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2729 {
2730         struct nfs4_client *clp = dp->dl_stid.sc_client;
2731         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2732
2733         /* We're assuming the state code never drops its reference
2734          * without first removing the lease.  Since we're in this lease
2735          * callback (and since the lease code is serialized by the kernel
2736          * lock) we know the server hasn't removed the lease yet, we know
2737          * it's safe to take a reference: */
2738         atomic_inc(&dp->dl_count);
2739
2740         list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2741
2742         /* Only place dl_time is set; protected by i_lock: */
2743         dp->dl_time = get_seconds();
2744
2745         nfsd4_cb_recall(dp);
2746 }
2747
2748 /* Called from break_lease() with i_lock held. */
2749 static void nfsd_break_deleg_cb(struct file_lock *fl)
2750 {
2751         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2752         struct nfs4_delegation *dp;
2753
2754         if (!fp) {
2755                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2756                 return;
2757         }
2758         if (fp->fi_had_conflict) {
2759                 WARN(1, "duplicate break on %p\n", fp);
2760                 return;
2761         }
2762         /*
2763          * We don't want the locks code to timeout the lease for us;
2764          * we'll remove it ourself if a delegation isn't returned
2765          * in time:
2766          */
2767         fl->fl_break_time = 0;
2768
2769         spin_lock(&recall_lock);
2770         fp->fi_had_conflict = true;
2771         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2772                 nfsd_break_one_deleg(dp);
2773         spin_unlock(&recall_lock);
2774 }
2775
2776 static
2777 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2778 {
2779         if (arg & F_UNLCK)
2780                 return lease_modify(onlist, arg);
2781         else
2782                 return -EAGAIN;
2783 }
2784
2785 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2786         .lm_break = nfsd_break_deleg_cb,
2787         .lm_change = nfsd_change_deleg_cb,
2788 };
2789
2790 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2791 {
2792         if (nfsd4_has_session(cstate))
2793                 return nfs_ok;
2794         if (seqid == so->so_seqid - 1)
2795                 return nfserr_replay_me;
2796         if (seqid == so->so_seqid)
2797                 return nfs_ok;
2798         return nfserr_bad_seqid;
2799 }
2800
2801 __be32
2802 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2803                     struct nfsd4_open *open, struct nfsd_net *nn)
2804 {
2805         clientid_t *clientid = &open->op_clientid;
2806         struct nfs4_client *clp = NULL;
2807         unsigned int strhashval;
2808         struct nfs4_openowner *oo = NULL;
2809         __be32 status;
2810
2811         if (STALE_CLIENTID(&open->op_clientid, nn))
2812                 return nfserr_stale_clientid;
2813         /*
2814          * In case we need it later, after we've already created the
2815          * file and don't want to risk a further failure:
2816          */
2817         open->op_file = nfsd4_alloc_file();
2818         if (open->op_file == NULL)
2819                 return nfserr_jukebox;
2820
2821         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2822         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2823         open->op_openowner = oo;
2824         if (!oo) {
2825                 clp = find_confirmed_client(clientid, cstate->minorversion,
2826                                             nn);
2827                 if (clp == NULL)
2828                         return nfserr_expired;
2829                 goto new_owner;
2830         }
2831         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2832                 /* Replace unconfirmed owners without checking for replay. */
2833                 clp = oo->oo_owner.so_client;
2834                 release_openowner(oo);
2835                 open->op_openowner = NULL;
2836                 goto new_owner;
2837         }
2838         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2839         if (status)
2840                 return status;
2841         clp = oo->oo_owner.so_client;
2842         goto alloc_stateid;
2843 new_owner:
2844         oo = alloc_init_open_stateowner(strhashval, clp, open);
2845         if (oo == NULL)
2846                 return nfserr_jukebox;
2847         open->op_openowner = oo;
2848 alloc_stateid:
2849         open->op_stp = nfs4_alloc_stateid(clp);
2850         if (!open->op_stp)
2851                 return nfserr_jukebox;
2852         return nfs_ok;
2853 }
2854
2855 static inline __be32
2856 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2857 {
2858         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2859                 return nfserr_openmode;
2860         else
2861                 return nfs_ok;
2862 }
2863
2864 static int share_access_to_flags(u32 share_access)
2865 {
2866         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2867 }
2868
2869 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2870 {
2871         struct nfs4_stid *ret;
2872
2873         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2874         if (!ret)
2875                 return NULL;
2876         return delegstateid(ret);
2877 }
2878
2879 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2880 {
2881         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2882                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2883 }
2884
2885 static __be32
2886 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2887                 struct nfs4_delegation **dp)
2888 {
2889         int flags;
2890         __be32 status = nfserr_bad_stateid;
2891
2892         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2893         if (*dp == NULL)
2894                 goto out;
2895         flags = share_access_to_flags(open->op_share_access);
2896         status = nfs4_check_delegmode(*dp, flags);
2897         if (status)
2898                 *dp = NULL;
2899 out:
2900         if (!nfsd4_is_deleg_cur(open))
2901                 return nfs_ok;
2902         if (status)
2903                 return status;
2904         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2905         return nfs_ok;
2906 }
2907
2908 static __be32
2909 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2910 {
2911         struct nfs4_ol_stateid *local;
2912         struct nfs4_openowner *oo = open->op_openowner;
2913
2914         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2915                 /* ignore lock owners */
2916                 if (local->st_stateowner->so_is_open_owner == 0)
2917                         continue;
2918                 /* remember if we have seen this open owner */
2919                 if (local->st_stateowner == &oo->oo_owner)
2920                         *stpp = local;
2921                 /* check for conflicting share reservations */
2922                 if (!test_share(local, open))
2923                         return nfserr_share_denied;
2924         }
2925         return nfs_ok;
2926 }
2927
2928 static inline int nfs4_access_to_access(u32 nfs4_access)
2929 {
2930         int flags = 0;
2931
2932         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2933                 flags |= NFSD_MAY_READ;
2934         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2935                 flags |= NFSD_MAY_WRITE;
2936         return flags;
2937 }
2938
2939 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2940                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2941 {
2942         __be32 status;
2943         int oflag = nfs4_access_to_omode(open->op_share_access);
2944         int access = nfs4_access_to_access(open->op_share_access);
2945
2946         if (!fp->fi_fds[oflag]) {
2947                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2948                         &fp->fi_fds[oflag]);
2949                 if (status)
2950                         return status;
2951         }
2952         nfs4_file_get_access(fp, oflag);
2953
2954         return nfs_ok;
2955 }
2956
2957 static inline __be32
2958 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2959                 struct nfsd4_open *open)
2960 {
2961         struct iattr iattr = {
2962                 .ia_valid = ATTR_SIZE,
2963                 .ia_size = 0,
2964         };
2965         if (!open->op_truncate)
2966                 return 0;
2967         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2968                 return nfserr_inval;
2969         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2970 }
2971
2972 static __be32
2973 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)
2974 {
2975         u32 op_share_access = open->op_share_access;
2976         bool new_access;
2977         __be32 status;
2978
2979         new_access = !test_access(op_share_access, stp);
2980         if (new_access) {
2981                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2982                 if (status)
2983                         return status;
2984         }
2985         status = nfsd4_truncate(rqstp, cur_fh, open);
2986         if (status) {
2987                 if (new_access) {
2988                         int oflag = nfs4_access_to_omode(op_share_access);
2989                         nfs4_file_put_access(fp, oflag);
2990                 }
2991                 return status;
2992         }
2993         /* remember the open */
2994         set_access(op_share_access, stp);
2995         set_deny(open->op_share_deny, stp);
2996
2997         return nfs_ok;
2998 }
2999
3000
3001 static void
3002 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3003 {
3004         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3005 }
3006
3007 /* Should we give out recallable state?: */
3008 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3009 {
3010         if (clp->cl_cb_state == NFSD4_CB_UP)
3011                 return true;
3012         /*
3013          * In the sessions case, since we don't have to establish a
3014          * separate connection for callbacks, we assume it's OK
3015          * until we hear otherwise:
3016          */
3017         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3018 }
3019
3020 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3021 {
3022         struct file_lock *fl;
3023
3024         fl = locks_alloc_lock();
3025         if (!fl)
3026                 return NULL;
3027         locks_init_lock(fl);
3028         fl->fl_lmops = &nfsd_lease_mng_ops;
3029         fl->fl_flags = FL_DELEG;
3030         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3031         fl->fl_end = OFFSET_MAX;
3032         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3033         fl->fl_pid = current->tgid;
3034         return fl;
3035 }
3036
3037 static int nfs4_setlease(struct nfs4_delegation *dp)
3038 {
3039         struct nfs4_file *fp = dp->dl_file;
3040         struct file_lock *fl;
3041         int status;
3042
3043         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3044         if (!fl)
3045                 return -ENOMEM;
3046         fl->fl_file = find_readable_file(fp);
3047         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3048         if (status)
3049                 goto out_free;
3050         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3051         fp->fi_lease = fl;
3052         fp->fi_deleg_file = get_file(fl->fl_file);
3053         atomic_set(&fp->fi_delegees, 1);
3054         list_add(&dp->dl_perfile, &fp->fi_delegations);
3055         return 0;
3056 out_free:
3057         locks_free_lock(fl);
3058         return status;
3059 }
3060
3061 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3062 {
3063         int status;
3064
3065         if (fp->fi_had_conflict)
3066                 return -EAGAIN;
3067         get_nfs4_file(fp);
3068         dp->dl_file = fp;
3069         if (!fp->fi_lease) {
3070                 status = nfs4_setlease(dp);
3071                 if (status)
3072                         goto out_free;
3073                 return 0;
3074         }
3075         spin_lock(&recall_lock);
3076         if (fp->fi_had_conflict) {
3077                 spin_unlock(&recall_lock);
3078                 status = -EAGAIN;
3079                 goto out_free;
3080         }
3081         atomic_inc(&fp->fi_delegees);
3082         list_add(&dp->dl_perfile, &fp->fi_delegations);
3083         spin_unlock(&recall_lock);
3084         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3085         return 0;
3086 out_free:
3087         put_nfs4_file(fp);
3088         dp->dl_file = fp;
3089         return status;
3090 }
3091
3092 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3093 {
3094         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3095         if (status == -EAGAIN)
3096                 open->op_why_no_deleg = WND4_CONTENTION;
3097         else {
3098                 open->op_why_no_deleg = WND4_RESOURCE;
3099                 switch (open->op_deleg_want) {
3100                 case NFS4_SHARE_WANT_READ_DELEG:
3101                 case NFS4_SHARE_WANT_WRITE_DELEG:
3102                 case NFS4_SHARE_WANT_ANY_DELEG:
3103                         break;
3104                 case NFS4_SHARE_WANT_CANCEL:
3105                         open->op_why_no_deleg = WND4_CANCELLED;
3106                         break;
3107                 case NFS4_SHARE_WANT_NO_DELEG:
3108                         WARN_ON_ONCE(1);
3109                 }
3110         }
3111 }
3112
3113 /*
3114  * Attempt to hand out a delegation.
3115  *
3116  * Note we don't support write delegations, and won't until the vfs has
3117  * proper support for them.
3118  */
3119 static void
3120 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3121                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3122 {
3123         struct nfs4_delegation *dp;
3124         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3125         int cb_up;
3126         int status = 0;
3127
3128         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3129         open->op_recall = 0;
3130         switch (open->op_claim_type) {
3131                 case NFS4_OPEN_CLAIM_PREVIOUS:
3132                         if (!cb_up)
3133                                 open->op_recall = 1;
3134                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3135                                 goto out_no_deleg;
3136                         break;
3137                 case NFS4_OPEN_CLAIM_NULL:
3138                 case NFS4_OPEN_CLAIM_FH:
3139                         /*
3140                          * Let's not give out any delegations till everyone's
3141                          * had the chance to reclaim theirs....
3142                          */
3143                         if (locks_in_grace(net))
3144                                 goto out_no_deleg;
3145                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3146                                 goto out_no_deleg;
3147                         /*
3148                          * Also, if the file was opened for write or
3149                          * create, there's a good chance the client's
3150                          * about to write to it, resulting in an
3151                          * immediate recall (since we don't support
3152                          * write delegations):
3153                          */
3154                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3155                                 goto out_no_deleg;
3156                         if (open->op_create == NFS4_OPEN_CREATE)
3157                                 goto out_no_deleg;
3158                         break;
3159                 default:
3160                         goto out_no_deleg;
3161         }
3162         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3163         if (dp == NULL)
3164                 goto out_no_deleg;
3165         status = nfs4_set_delegation(dp, stp->st_file);
3166         if (status)
3167                 goto out_free;
3168
3169         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3170
3171         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3172                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3173         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3174         return;
3175 out_free:
3176         remove_stid(&dp->dl_stid);
3177         nfs4_put_delegation(dp);
3178 out_no_deleg:
3179         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3180         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3181             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3182                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3183                 open->op_recall = 1;
3184         }
3185
3186         /* 4.1 client asking for a delegation? */
3187         if (open->op_deleg_want)
3188                 nfsd4_open_deleg_none_ext(open, status);
3189         return;
3190 }
3191
3192 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3193                                         struct nfs4_delegation *dp)
3194 {
3195         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3196             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3197                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3198                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3199         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3200                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3201                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3202                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3203         }
3204         /* Otherwise the client must be confused wanting a delegation
3205          * it already has, therefore we don't return
3206          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3207          */
3208 }
3209
3210 /*
3211  * called with nfs4_lock_state() held.
3212  */
3213 __be32
3214 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3215 {
3216         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3217         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3218         struct nfs4_file *fp = NULL;
3219         struct inode *ino = current_fh->fh_dentry->d_inode;
3220         struct nfs4_ol_stateid *stp = NULL;
3221         struct nfs4_delegation *dp = NULL;
3222         __be32 status;
3223
3224         /*
3225          * Lookup file; if found, lookup stateid and check open request,
3226          * and check for delegations in the process of being recalled.
3227          * If not found, create the nfs4_file struct
3228          */
3229         fp = find_file(ino);
3230         if (fp) {
3231                 if ((status = nfs4_check_open(fp, open, &stp)))
3232                         goto out;
3233                 status = nfs4_check_deleg(cl, open, &dp);
3234                 if (status)
3235                         goto out;
3236         } else {
3237                 status = nfserr_bad_stateid;
3238                 if (nfsd4_is_deleg_cur(open))
3239                         goto out;
3240                 status = nfserr_jukebox;
3241                 fp = open->op_file;
3242                 open->op_file = NULL;
3243                 nfsd4_init_file(fp, ino);
3244         }
3245
3246         /*
3247          * OPEN the file, or upgrade an existing OPEN.
3248          * If truncate fails, the OPEN fails.
3249          */
3250         if (stp) {
3251                 /* Stateid was found, this is an OPEN upgrade */
3252                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3253                 if (status)
3254                         goto out;
3255         } else {
3256                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3257                 if (status)
3258                         goto out;
3259                 status = nfsd4_truncate(rqstp, current_fh, open);
3260                 if (status)
3261                         goto out;
3262                 stp = open->op_stp;
3263                 open->op_stp = NULL;
3264                 init_open_stateid(stp, fp, open);
3265         }
3266         update_stateid(&stp->st_stid.sc_stateid);
3267         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3268
3269         if (nfsd4_has_session(&resp->cstate)) {
3270                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3271
3272                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3273                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3274                         open->op_why_no_deleg = WND4_NOT_WANTED;
3275                         goto nodeleg;
3276                 }
3277         }
3278
3279         /*
3280         * Attempt to hand out a delegation. No error return, because the
3281         * OPEN succeeds even if we fail.
3282         */
3283         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3284 nodeleg:
3285         status = nfs_ok;
3286
3287         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3288                 STATEID_VAL(&stp->st_stid.sc_stateid));
3289 out:
3290         /* 4.1 client trying to upgrade/downgrade delegation? */
3291         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3292             open->op_deleg_want)
3293                 nfsd4_deleg_xgrade_none_ext(open, dp);
3294
3295         if (fp)
3296                 put_nfs4_file(fp);
3297         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3298                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3299         /*
3300         * To finish the open response, we just need to set the rflags.
3301         */
3302         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3303         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3304             !nfsd4_has_session(&resp->cstate))
3305                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3306
3307         return status;
3308 }
3309
3310 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3311 {
3312         if (open->op_openowner) {
3313                 struct nfs4_openowner *oo = open->op_openowner;
3314
3315                 if (!list_empty(&oo->oo_owner.so_stateids))
3316                         list_del_init(&oo->oo_close_lru);
3317                 if (oo->oo_flags & NFS4_OO_NEW) {
3318                         if (status) {
3319                                 release_openowner(oo);
3320                                 open->op_openowner = NULL;
3321                         } else
3322                                 oo->oo_flags &= ~NFS4_OO_NEW;
3323                 }
3324         }
3325         if (open->op_file)
3326                 nfsd4_free_file(open->op_file);
3327         if (open->op_stp)
3328                 free_generic_stateid(open->op_stp);
3329 }
3330
3331 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3332 {
3333         struct nfs4_client *found;
3334
3335         if (STALE_CLIENTID(clid, nn))
3336                 return nfserr_stale_clientid;
3337         found = find_confirmed_client(clid, session, nn);
3338         if (clp)
3339                 *clp = found;
3340         return found ? nfs_ok : nfserr_expired;
3341 }
3342
3343 __be32
3344 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3345             clientid_t *clid)
3346 {
3347         struct nfs4_client *clp;
3348         __be32 status;
3349         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3350
3351         nfs4_lock_state();
3352         dprintk("process_renew(%08x/%08x): starting\n", 
3353                         clid->cl_boot, clid->cl_id);