NFSd: Move default initialisers from create_client() to alloc_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         free_svc_cred(&clp->cl_cred);
1111         kfree(clp->cl_name.data);
1112         idr_destroy(&clp->cl_stateids);
1113         kfree(clp);
1114 }
1115
1116 /* must be called under the client_lock */
1117 static inline void
1118 unhash_client_locked(struct nfs4_client *clp)
1119 {
1120         struct nfsd4_session *ses;
1121
1122         list_del(&clp->cl_lru);
1123         spin_lock(&clp->cl_lock);
1124         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1125                 list_del_init(&ses->se_hash);
1126         spin_unlock(&clp->cl_lock);
1127 }
1128
1129 static void
1130 destroy_client(struct nfs4_client *clp)
1131 {
1132         struct nfs4_openowner *oo;
1133         struct nfs4_delegation *dp;
1134         struct list_head reaplist;
1135         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1136
1137         INIT_LIST_HEAD(&reaplist);
1138         spin_lock(&recall_lock);
1139         while (!list_empty(&clp->cl_delegations)) {
1140                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1141                 list_del_init(&dp->dl_perclnt);
1142                 list_move(&dp->dl_recall_lru, &reaplist);
1143         }
1144         spin_unlock(&recall_lock);
1145         while (!list_empty(&reaplist)) {
1146                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1147                 destroy_delegation(dp);
1148         }
1149         list_splice_init(&clp->cl_revoked, &reaplist);
1150         while (!list_empty(&reaplist)) {
1151                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1152                 destroy_revoked_delegation(dp);
1153         }
1154         while (!list_empty(&clp->cl_openowners)) {
1155                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1156                 release_openowner(oo);
1157         }
1158         nfsd4_shutdown_callback(clp);
1159         if (clp->cl_cb_conn.cb_xprt)
1160                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1161         list_del(&clp->cl_idhash);
1162         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1163                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1164         else
1165                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1166         spin_lock(&nn->client_lock);
1167         unhash_client_locked(clp);
1168         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1169         free_client(clp);
1170         spin_unlock(&nn->client_lock);
1171 }
1172
1173 static void expire_client(struct nfs4_client *clp)
1174 {
1175         nfsd4_client_record_remove(clp);
1176         destroy_client(clp);
1177 }
1178
1179 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1180 {
1181         memcpy(target->cl_verifier.data, source->data,
1182                         sizeof(target->cl_verifier.data));
1183 }
1184
1185 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1186 {
1187         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1188         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1189 }
1190
1191 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1192 {
1193         if (source->cr_principal) {
1194                 target->cr_principal =
1195                                 kstrdup(source->cr_principal, GFP_KERNEL);
1196                 if (target->cr_principal == NULL)
1197                         return -ENOMEM;
1198         } else
1199                 target->cr_principal = NULL;
1200         target->cr_flavor = source->cr_flavor;
1201         target->cr_uid = source->cr_uid;
1202         target->cr_gid = source->cr_gid;
1203         target->cr_group_info = source->cr_group_info;
1204         get_group_info(target->cr_group_info);
1205         target->cr_gss_mech = source->cr_gss_mech;
1206         if (source->cr_gss_mech)
1207                 gss_mech_get(source->cr_gss_mech);
1208         return 0;
1209 }
1210
1211 static long long
1212 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1213 {
1214         long long res;
1215
1216         res = o1->len - o2->len;
1217         if (res)
1218                 return res;
1219         return (long long)memcmp(o1->data, o2->data, o1->len);
1220 }
1221
1222 static int same_name(const char *n1, const char *n2)
1223 {
1224         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1225 }
1226
1227 static int
1228 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1229 {
1230         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1231 }
1232
1233 static int
1234 same_clid(clientid_t *cl1, clientid_t *cl2)
1235 {
1236         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1237 }
1238
1239 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1240 {
1241         int i;
1242
1243         if (g1->ngroups != g2->ngroups)
1244                 return false;
1245         for (i=0; i<g1->ngroups; i++)
1246                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1247                         return false;
1248         return true;
1249 }
1250
1251 /*
1252  * RFC 3530 language requires clid_inuse be returned when the
1253  * "principal" associated with a requests differs from that previously
1254  * used.  We use uid, gid's, and gss principal string as our best
1255  * approximation.  We also don't want to allow non-gss use of a client
1256  * established using gss: in theory cr_principal should catch that
1257  * change, but in practice cr_principal can be null even in the gss case
1258  * since gssd doesn't always pass down a principal string.
1259  */
1260 static bool is_gss_cred(struct svc_cred *cr)
1261 {
1262         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1263         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1264 }
1265
1266
1267 static bool
1268 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1269 {
1270         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1271                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1272                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1273                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1274                 return false;
1275         if (cr1->cr_principal == cr2->cr_principal)
1276                 return true;
1277         if (!cr1->cr_principal || !cr2->cr_principal)
1278                 return false;
1279         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1280 }
1281
1282 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1283 {
1284         struct svc_cred *cr = &rqstp->rq_cred;
1285         u32 service;
1286
1287         if (!cr->cr_gss_mech)
1288                 return false;
1289         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1290         return service == RPC_GSS_SVC_INTEGRITY ||
1291                service == RPC_GSS_SVC_PRIVACY;
1292 }
1293
1294 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1295 {
1296         struct svc_cred *cr = &rqstp->rq_cred;
1297
1298         if (!cl->cl_mach_cred)
1299                 return true;
1300         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1301                 return false;
1302         if (!svc_rqst_integrity_protected(rqstp))
1303                 return false;
1304         if (!cr->cr_principal)
1305                 return false;
1306         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1307 }
1308
1309 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1310 {
1311         static u32 current_clientid = 1;
1312
1313         clp->cl_clientid.cl_boot = nn->boot_time;
1314         clp->cl_clientid.cl_id = current_clientid++; 
1315 }
1316
1317 static void gen_confirm(struct nfs4_client *clp)
1318 {
1319         __be32 verf[2];
1320         static u32 i;
1321
1322         verf[0] = (__be32)get_seconds();
1323         verf[1] = (__be32)i++;
1324         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1325 }
1326
1327 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1328 {
1329         struct nfs4_stid *ret;
1330
1331         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1332         if (!ret || !ret->sc_type)
1333                 return NULL;
1334         return ret;
1335 }
1336
1337 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1338 {
1339         struct nfs4_stid *s;
1340
1341         s = find_stateid(cl, t);
1342         if (!s)
1343                 return NULL;
1344         if (typemask & s->sc_type)
1345                 return s;
1346         return NULL;
1347 }
1348
1349 static struct nfs4_client *create_client(struct xdr_netobj name,
1350                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1351 {
1352         struct nfs4_client *clp;
1353         struct sockaddr *sa = svc_addr(rqstp);
1354         int ret;
1355         struct net *net = SVC_NET(rqstp);
1356         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1357
1358         clp = alloc_client(name);
1359         if (clp == NULL)
1360                 return NULL;
1361
1362         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1363         if (ret) {
1364                 spin_lock(&nn->client_lock);
1365                 free_client(clp);
1366                 spin_unlock(&nn->client_lock);
1367                 return NULL;
1368         }
1369         nfsd4_init_callback(&clp->cl_cb_null);
1370         clp->cl_time = get_seconds();
1371         clear_bit(0, &clp->cl_cb_slot_busy);
1372         copy_verf(clp, verf);
1373         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1374         gen_confirm(clp);
1375         clp->cl_cb_session = NULL;
1376         clp->net = net;
1377         return clp;
1378 }
1379
1380 static void
1381 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1382 {
1383         struct rb_node **new = &(root->rb_node), *parent = NULL;
1384         struct nfs4_client *clp;
1385
1386         while (*new) {
1387                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1388                 parent = *new;
1389
1390                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1391                         new = &((*new)->rb_left);
1392                 else
1393                         new = &((*new)->rb_right);
1394         }
1395
1396         rb_link_node(&new_clp->cl_namenode, parent, new);
1397         rb_insert_color(&new_clp->cl_namenode, root);
1398 }
1399
1400 static struct nfs4_client *
1401 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1402 {
1403         long long cmp;
1404         struct rb_node *node = root->rb_node;
1405         struct nfs4_client *clp;
1406
1407         while (node) {
1408                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1409                 cmp = compare_blob(&clp->cl_name, name);
1410                 if (cmp > 0)
1411                         node = node->rb_left;
1412                 else if (cmp < 0)
1413                         node = node->rb_right;
1414                 else
1415                         return clp;
1416         }
1417         return NULL;
1418 }
1419
1420 static void
1421 add_to_unconfirmed(struct nfs4_client *clp)
1422 {
1423         unsigned int idhashval;
1424         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1425
1426         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1427         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1428         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1429         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1430         renew_client(clp);
1431 }
1432
1433 static void
1434 move_to_confirmed(struct nfs4_client *clp)
1435 {
1436         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1437         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1438
1439         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1440         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1441         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1442         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1443         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1444         renew_client(clp);
1445 }
1446
1447 static struct nfs4_client *
1448 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1449 {
1450         struct nfs4_client *clp;
1451         unsigned int idhashval = clientid_hashval(clid->cl_id);
1452
1453         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1454                 if (same_clid(&clp->cl_clientid, clid)) {
1455                         if ((bool)clp->cl_minorversion != sessions)
1456                                 return NULL;
1457                         renew_client(clp);
1458                         return clp;
1459                 }
1460         }
1461         return NULL;
1462 }
1463
1464 static struct nfs4_client *
1465 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1466 {
1467         struct list_head *tbl = nn->conf_id_hashtbl;
1468
1469         return find_client_in_id_table(tbl, clid, sessions);
1470 }
1471
1472 static struct nfs4_client *
1473 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1474 {
1475         struct list_head *tbl = nn->unconf_id_hashtbl;
1476
1477         return find_client_in_id_table(tbl, clid, sessions);
1478 }
1479
1480 static bool clp_used_exchangeid(struct nfs4_client *clp)
1481 {
1482         return clp->cl_exchange_flags != 0;
1483
1484
1485 static struct nfs4_client *
1486 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1487 {
1488         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1489 }
1490
1491 static struct nfs4_client *
1492 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1493 {
1494         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1495 }
1496
1497 static void
1498 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1499 {
1500         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1501         struct sockaddr *sa = svc_addr(rqstp);
1502         u32 scopeid = rpc_get_scope_id(sa);
1503         unsigned short expected_family;
1504
1505         /* Currently, we only support tcp and tcp6 for the callback channel */
1506         if (se->se_callback_netid_len == 3 &&
1507             !memcmp(se->se_callback_netid_val, "tcp", 3))
1508                 expected_family = AF_INET;
1509         else if (se->se_callback_netid_len == 4 &&
1510                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1511                 expected_family = AF_INET6;
1512         else
1513                 goto out_err;
1514
1515         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1516                                             se->se_callback_addr_len,
1517                                             (struct sockaddr *)&conn->cb_addr,
1518                                             sizeof(conn->cb_addr));
1519
1520         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1521                 goto out_err;
1522
1523         if (conn->cb_addr.ss_family == AF_INET6)
1524                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1525
1526         conn->cb_prog = se->se_callback_prog;
1527         conn->cb_ident = se->se_callback_ident;
1528         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1529         return;
1530 out_err:
1531         conn->cb_addr.ss_family = AF_UNSPEC;
1532         conn->cb_addrlen = 0;
1533         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1534                 "will not receive delegations\n",
1535                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1536
1537         return;
1538 }
1539
1540 /*
1541  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1542  */
1543 void
1544 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1545 {
1546         struct nfsd4_slot *slot = resp->cstate.slot;
1547         unsigned int base;
1548
1549         dprintk("--> %s slot %p\n", __func__, slot);
1550
1551         slot->sl_opcnt = resp->opcnt;
1552         slot->sl_status = resp->cstate.status;
1553
1554         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1555         if (nfsd4_not_cached(resp)) {
1556                 slot->sl_datalen = 0;
1557                 return;
1558         }
1559         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1560         base = (char *)resp->cstate.datap -
1561                                         (char *)resp->xbuf->head[0].iov_base;
1562         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1563                                     slot->sl_datalen))
1564                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1565         return;
1566 }
1567
1568 /*
1569  * Encode the replay sequence operation from the slot values.
1570  * If cachethis is FALSE encode the uncached rep error on the next
1571  * operation which sets resp->p and increments resp->opcnt for
1572  * nfs4svc_encode_compoundres.
1573  *
1574  */
1575 static __be32
1576 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1577                           struct nfsd4_compoundres *resp)
1578 {
1579         struct nfsd4_op *op;
1580         struct nfsd4_slot *slot = resp->cstate.slot;
1581
1582         /* Encode the replayed sequence operation */
1583         op = &args->ops[resp->opcnt - 1];
1584         nfsd4_encode_operation(resp, op);
1585
1586         /* Return nfserr_retry_uncached_rep in next operation. */
1587         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1588                 op = &args->ops[resp->opcnt++];
1589                 op->status = nfserr_retry_uncached_rep;
1590                 nfsd4_encode_operation(resp, op);
1591         }
1592         return op->status;
1593 }
1594
1595 /*
1596  * The sequence operation is not cached because we can use the slot and
1597  * session values.
1598  */
1599 static __be32
1600 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1601                          struct nfsd4_sequence *seq)
1602 {
1603         struct nfsd4_slot *slot = resp->cstate.slot;
1604         __be32 status;
1605
1606         dprintk("--> %s slot %p\n", __func__, slot);
1607
1608         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1609         if (status)
1610                 return status;
1611
1612         /* The sequence operation has been encoded, cstate->datap set. */
1613         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1614
1615         resp->opcnt = slot->sl_opcnt;
1616         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1617         status = slot->sl_status;
1618
1619         return status;
1620 }
1621
1622 /*
1623  * Set the exchange_id flags returned by the server.
1624  */
1625 static void
1626 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1627 {
1628         /* pNFS is not supported */
1629         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1630
1631         /* Referrals are supported, Migration is not. */
1632         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1633
1634         /* set the wire flags to return to client. */
1635         clid->flags = new->cl_exchange_flags;
1636 }
1637
1638 static bool client_has_state(struct nfs4_client *clp)
1639 {
1640         /*
1641          * Note clp->cl_openowners check isn't quite right: there's no
1642          * need to count owners without stateid's.
1643          *
1644          * Also note we should probably be using this in 4.0 case too.
1645          */
1646         return !list_empty(&clp->cl_openowners)
1647                 || !list_empty(&clp->cl_delegations)
1648                 || !list_empty(&clp->cl_sessions);
1649 }
1650
1651 __be32
1652 nfsd4_exchange_id(struct svc_rqst *rqstp,
1653                   struct nfsd4_compound_state *cstate,
1654                   struct nfsd4_exchange_id *exid)
1655 {
1656         struct nfs4_client *unconf, *conf, *new;
1657         __be32 status;
1658         char                    addr_str[INET6_ADDRSTRLEN];
1659         nfs4_verifier           verf = exid->verifier;
1660         struct sockaddr         *sa = svc_addr(rqstp);
1661         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1662         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1663
1664         rpc_ntop(sa, addr_str, sizeof(addr_str));
1665         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1666                 "ip_addr=%s flags %x, spa_how %d\n",
1667                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1668                 addr_str, exid->flags, exid->spa_how);
1669
1670         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1671                 return nfserr_inval;
1672
1673         switch (exid->spa_how) {
1674         case SP4_MACH_CRED:
1675                 if (!svc_rqst_integrity_protected(rqstp))
1676                         return nfserr_inval;
1677         case SP4_NONE:
1678                 break;
1679         default:                                /* checked by xdr code */
1680                 WARN_ON_ONCE(1);
1681         case SP4_SSV:
1682                 return nfserr_encr_alg_unsupp;
1683         }
1684
1685         /* Cases below refer to rfc 5661 section 18.35.4: */
1686         nfs4_lock_state();
1687         conf = find_confirmed_client_by_name(&exid->clname, nn);
1688         if (conf) {
1689                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1690                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1691
1692                 if (update) {
1693                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1694                                 status = nfserr_inval;
1695                                 goto out;
1696                         }
1697                         if (!mach_creds_match(conf, rqstp)) {
1698                                 status = nfserr_wrong_cred;
1699                                 goto out;
1700                         }
1701                         if (!creds_match) { /* case 9 */
1702                                 status = nfserr_perm;
1703                                 goto out;
1704                         }
1705                         if (!verfs_match) { /* case 8 */
1706                                 status = nfserr_not_same;
1707                                 goto out;
1708                         }
1709                         /* case 6 */
1710                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1711                         new = conf;
1712                         goto out_copy;
1713                 }
1714                 if (!creds_match) { /* case 3 */
1715                         if (client_has_state(conf)) {
1716                                 status = nfserr_clid_inuse;
1717                                 goto out;
1718                         }
1719                         expire_client(conf);
1720                         goto out_new;
1721                 }
1722                 if (verfs_match) { /* case 2 */
1723                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1724                         new = conf;
1725                         goto out_copy;
1726                 }
1727                 /* case 5, client reboot */
1728                 goto out_new;
1729         }
1730
1731         if (update) { /* case 7 */
1732                 status = nfserr_noent;
1733                 goto out;
1734         }
1735
1736         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1737         if (unconf) /* case 4, possible retry or client restart */
1738                 expire_client(unconf);
1739
1740         /* case 1 (normal case) */
1741 out_new:
1742         new = create_client(exid->clname, rqstp, &verf);
1743         if (new == NULL) {
1744                 status = nfserr_jukebox;
1745                 goto out;
1746         }
1747         new->cl_minorversion = cstate->minorversion;
1748         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1749
1750         gen_clid(new, nn);
1751         add_to_unconfirmed(new);
1752 out_copy:
1753         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1754         exid->clientid.cl_id = new->cl_clientid.cl_id;
1755
1756         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1757         nfsd4_set_ex_flags(new, exid);
1758
1759         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1760                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1761         status = nfs_ok;
1762
1763 out:
1764         nfs4_unlock_state();
1765         return status;
1766 }
1767
1768 static __be32
1769 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1770 {
1771         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1772                 slot_seqid);
1773
1774         /* The slot is in use, and no response has been sent. */
1775         if (slot_inuse) {
1776                 if (seqid == slot_seqid)
1777                         return nfserr_jukebox;
1778                 else
1779                         return nfserr_seq_misordered;
1780         }
1781         /* Note unsigned 32-bit arithmetic handles wraparound: */
1782         if (likely(seqid == slot_seqid + 1))
1783                 return nfs_ok;
1784         if (seqid == slot_seqid)
1785                 return nfserr_replay_cache;
1786         return nfserr_seq_misordered;
1787 }
1788
1789 /*
1790  * Cache the create session result into the create session single DRC
1791  * slot cache by saving the xdr structure. sl_seqid has been set.
1792  * Do this for solo or embedded create session operations.
1793  */
1794 static void
1795 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1796                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1797 {
1798         slot->sl_status = nfserr;
1799         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1800 }
1801
1802 static __be32
1803 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1804                             struct nfsd4_clid_slot *slot)
1805 {
1806         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1807         return slot->sl_status;
1808 }
1809
1810 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1811                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1812                         1 +     /* MIN tag is length with zero, only length */ \
1813                         3 +     /* version, opcount, opcode */ \
1814                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1815                                 /* seqid, slotID, slotID, cache */ \
1816                         4 ) * sizeof(__be32))
1817
1818 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1819                         2 +     /* verifier: AUTH_NULL, length 0 */\
1820                         1 +     /* status */ \
1821                         1 +     /* MIN tag is length with zero, only length */ \
1822                         3 +     /* opcount, opcode, opstatus*/ \
1823                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1824                                 /* seqid, slotID, slotID, slotID, status */ \
1825                         5 ) * sizeof(__be32))
1826
1827 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1828 {
1829         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1830
1831         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1832                 return nfserr_toosmall;
1833         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1834                 return nfserr_toosmall;
1835         ca->headerpadsz = 0;
1836         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1837         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1838         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1839         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1840                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1841         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1842         /*
1843          * Note decreasing slot size below client's request may make it
1844          * difficult for client to function correctly, whereas
1845          * decreasing the number of slots will (just?) affect
1846          * performance.  When short on memory we therefore prefer to
1847          * decrease number of slots instead of their size.  Clients that
1848          * request larger slots than they need will get poor results:
1849          */
1850         ca->maxreqs = nfsd4_get_drc_mem(ca);
1851         if (!ca->maxreqs)
1852                 return nfserr_jukebox;
1853
1854         return nfs_ok;
1855 }
1856
1857 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
1858                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1859 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
1860                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
1861
1862 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1863 {
1864         ca->headerpadsz = 0;
1865
1866         /*
1867          * These RPC_MAX_HEADER macros are overkill, especially since we
1868          * don't even do gss on the backchannel yet.  But this is still
1869          * less than 1k.  Tighten up this estimate in the unlikely event
1870          * it turns out to be a problem for some client:
1871          */
1872         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1873                 return nfserr_toosmall;
1874         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1875                 return nfserr_toosmall;
1876         ca->maxresp_cached = 0;
1877         if (ca->maxops < 2)
1878                 return nfserr_toosmall;
1879
1880         return nfs_ok;
1881 }
1882
1883 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1884 {
1885         switch (cbs->flavor) {
1886         case RPC_AUTH_NULL:
1887         case RPC_AUTH_UNIX:
1888                 return nfs_ok;
1889         default:
1890                 /*
1891                  * GSS case: the spec doesn't allow us to return this
1892                  * error.  But it also doesn't allow us not to support
1893                  * GSS.
1894                  * I'd rather this fail hard than return some error the
1895                  * client might think it can already handle:
1896                  */
1897                 return nfserr_encr_alg_unsupp;
1898         }
1899 }
1900
1901 __be32
1902 nfsd4_create_session(struct svc_rqst *rqstp,
1903                      struct nfsd4_compound_state *cstate,
1904                      struct nfsd4_create_session *cr_ses)
1905 {
1906         struct sockaddr *sa = svc_addr(rqstp);
1907         struct nfs4_client *conf, *unconf;
1908         struct nfsd4_session *new;
1909         struct nfsd4_conn *conn;
1910         struct nfsd4_clid_slot *cs_slot = NULL;
1911         __be32 status = 0;
1912         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1913
1914         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1915                 return nfserr_inval;
1916         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1917         if (status)
1918                 return status;
1919         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1920         if (status)
1921                 return status;
1922         status = check_backchannel_attrs(&cr_ses->back_channel);
1923         if (status)
1924                 goto out_release_drc_mem;
1925         status = nfserr_jukebox;
1926         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
1927         if (!new)
1928                 goto out_release_drc_mem;
1929         conn = alloc_conn_from_crses(rqstp, cr_ses);
1930         if (!conn)
1931                 goto out_free_session;
1932
1933         nfs4_lock_state();
1934         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1935         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1936         WARN_ON_ONCE(conf && unconf);
1937
1938         if (conf) {
1939                 status = nfserr_wrong_cred;
1940                 if (!mach_creds_match(conf, rqstp))
1941                         goto out_free_conn;
1942                 cs_slot = &conf->cl_cs_slot;
1943                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1944                 if (status == nfserr_replay_cache) {
1945                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1946                         goto out_free_conn;
1947                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1948                         status = nfserr_seq_misordered;
1949                         goto out_free_conn;
1950                 }
1951         } else if (unconf) {
1952                 struct nfs4_client *old;
1953                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1954                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1955                         status = nfserr_clid_inuse;
1956                         goto out_free_conn;
1957                 }
1958                 status = nfserr_wrong_cred;
1959                 if (!mach_creds_match(unconf, rqstp))
1960                         goto out_free_conn;
1961                 cs_slot = &unconf->cl_cs_slot;
1962                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1963                 if (status) {
1964                         /* an unconfirmed replay returns misordered */
1965                         status = nfserr_seq_misordered;
1966                         goto out_free_conn;
1967                 }
1968                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1969                 if (old) {
1970                         status = mark_client_expired(old);
1971                         if (status)
1972                                 goto out_free_conn;
1973                         expire_client(old);
1974                 }
1975                 move_to_confirmed(unconf);
1976                 conf = unconf;
1977         } else {
1978                 status = nfserr_stale_clientid;
1979                 goto out_free_conn;
1980         }
1981         status = nfs_ok;
1982         /*
1983          * We do not support RDMA or persistent sessions
1984          */
1985         cr_ses->flags &= ~SESSION4_PERSIST;
1986         cr_ses->flags &= ~SESSION4_RDMA;
1987
1988         init_session(rqstp, new, conf, cr_ses);
1989         nfsd4_init_conn(rqstp, conn, new);
1990
1991         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1992                NFS4_MAX_SESSIONID_LEN);
1993         cs_slot->sl_seqid++;
1994         cr_ses->seqid = cs_slot->sl_seqid;
1995
1996         /* cache solo and embedded create sessions under the state lock */
1997         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1998         nfs4_unlock_state();
1999         return status;
2000 out_free_conn:
2001         nfs4_unlock_state();
2002         free_conn(conn);
2003 out_free_session:
2004         __free_session(new);
2005 out_release_drc_mem:
2006         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2007         return status;
2008 }
2009
2010 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2011 {
2012         switch (*dir) {
2013         case NFS4_CDFC4_FORE:
2014         case NFS4_CDFC4_BACK:
2015                 return nfs_ok;
2016         case NFS4_CDFC4_FORE_OR_BOTH:
2017         case NFS4_CDFC4_BACK_OR_BOTH:
2018                 *dir = NFS4_CDFC4_BOTH;
2019                 return nfs_ok;
2020         };
2021         return nfserr_inval;
2022 }
2023
2024 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2025 {
2026         struct nfsd4_session *session = cstate->session;
2027         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2028         __be32 status;
2029
2030         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2031         if (status)
2032                 return status;
2033         spin_lock(&nn->client_lock);
2034         session->se_cb_prog = bc->bc_cb_program;
2035         session->se_cb_sec = bc->bc_cb_sec;
2036         spin_unlock(&nn->client_lock);
2037
2038         nfsd4_probe_callback(session->se_client);
2039
2040         return nfs_ok;
2041 }
2042
2043 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2044                      struct nfsd4_compound_state *cstate,
2045                      struct nfsd4_bind_conn_to_session *bcts)
2046 {
2047         __be32 status;
2048         struct nfsd4_conn *conn;
2049         struct nfsd4_session *session;
2050         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2051
2052         if (!nfsd4_last_compound_op(rqstp))
2053                 return nfserr_not_only_op;
2054         nfs4_lock_state();
2055         spin_lock(&nn->client_lock);
2056         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2057         spin_unlock(&nn->client_lock);
2058         status = nfserr_badsession;
2059         if (!session)
2060                 goto out;
2061         status = nfserr_wrong_cred;
2062         if (!mach_creds_match(session->se_client, rqstp))
2063                 goto out;
2064         status = nfsd4_map_bcts_dir(&bcts->dir);
2065         if (status)
2066                 goto out;
2067         conn = alloc_conn(rqstp, bcts->dir);
2068         status = nfserr_jukebox;
2069         if (!conn)
2070                 goto out;
2071         nfsd4_init_conn(rqstp, conn, session);
2072         status = nfs_ok;
2073 out:
2074         nfs4_unlock_state();
2075         return status;
2076 }
2077
2078 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2079 {
2080         if (!session)
2081                 return 0;
2082         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2083 }
2084
2085 __be32
2086 nfsd4_destroy_session(struct svc_rqst *r,
2087                       struct nfsd4_compound_state *cstate,
2088                       struct nfsd4_destroy_session *sessionid)
2089 {
2090         struct nfsd4_session *ses;
2091         __be32 status;
2092         int ref_held_by_me = 0;
2093         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2094
2095         nfs4_lock_state();
2096         status = nfserr_not_only_op;
2097         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2098                 if (!nfsd4_last_compound_op(r))
2099                         goto out;
2100                 ref_held_by_me++;
2101         }
2102         dump_sessionid(__func__, &sessionid->sessionid);
2103         spin_lock(&nn->client_lock);
2104         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2105         status = nfserr_badsession;
2106         if (!ses)
2107                 goto out_client_lock;
2108         status = nfserr_wrong_cred;
2109         if (!mach_creds_match(ses->se_client, r))
2110                 goto out_client_lock;
2111         nfsd4_get_session_locked(ses);
2112         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2113         if (status)
2114                 goto out_put_session;
2115         unhash_session(ses);
2116         spin_unlock(&nn->client_lock);
2117
2118         nfsd4_probe_callback_sync(ses->se_client);
2119
2120         spin_lock(&nn->client_lock);
2121         status = nfs_ok;
2122 out_put_session:
2123         nfsd4_put_session(ses);
2124 out_client_lock:
2125         spin_unlock(&nn->client_lock);
2126 out:
2127         nfs4_unlock_state();
2128         return status;
2129 }
2130
2131 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2132 {
2133         struct nfsd4_conn *c;
2134
2135         list_for_each_entry(c, &s->se_conns, cn_persession) {
2136                 if (c->cn_xprt == xpt) {
2137                         return c;
2138                 }
2139         }
2140         return NULL;
2141 }
2142
2143 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2144 {
2145         struct nfs4_client *clp = ses->se_client;
2146         struct nfsd4_conn *c;
2147         __be32 status = nfs_ok;
2148         int ret;
2149
2150         spin_lock(&clp->cl_lock);
2151         c = __nfsd4_find_conn(new->cn_xprt, ses);
2152         if (c)
2153                 goto out_free;
2154         status = nfserr_conn_not_bound_to_session;
2155         if (clp->cl_mach_cred)
2156                 goto out_free;
2157         __nfsd4_hash_conn(new, ses);
2158         spin_unlock(&clp->cl_lock);
2159         ret = nfsd4_register_conn(new);
2160         if (ret)
2161                 /* oops; xprt is already down: */
2162                 nfsd4_conn_lost(&new->cn_xpt_user);
2163         return nfs_ok;
2164 out_free:
2165         spin_unlock(&clp->cl_lock);
2166         free_conn(new);
2167         return status;
2168 }
2169
2170 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2171 {
2172         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2173
2174         return args->opcnt > session->se_fchannel.maxops;
2175 }
2176
2177 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2178                                   struct nfsd4_session *session)
2179 {
2180         struct xdr_buf *xb = &rqstp->rq_arg;
2181
2182         return xb->len > session->se_fchannel.maxreq_sz;
2183 }
2184
2185 __be32
2186 nfsd4_sequence(struct svc_rqst *rqstp,
2187                struct nfsd4_compound_state *cstate,
2188                struct nfsd4_sequence *seq)
2189 {
2190         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2191         struct nfsd4_session *session;
2192         struct nfs4_client *clp;
2193         struct nfsd4_slot *slot;
2194         struct nfsd4_conn *conn;
2195         __be32 status;
2196         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2197
2198         if (resp->opcnt != 1)
2199                 return nfserr_sequence_pos;
2200
2201         /*
2202          * Will be either used or freed by nfsd4_sequence_check_conn
2203          * below.
2204          */
2205         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2206         if (!conn)
2207                 return nfserr_jukebox;
2208
2209         spin_lock(&nn->client_lock);
2210         status = nfserr_badsession;
2211         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2212         if (!session)
2213                 goto out_no_session;
2214         clp = session->se_client;
2215         status = get_client_locked(clp);
2216         if (status)
2217                 goto out_no_session;
2218         status = nfsd4_get_session_locked(session);
2219         if (status)
2220                 goto out_put_client;
2221
2222         status = nfserr_too_many_ops;
2223         if (nfsd4_session_too_many_ops(rqstp, session))
2224                 goto out_put_session;
2225
2226         status = nfserr_req_too_big;
2227         if (nfsd4_request_too_big(rqstp, session))
2228                 goto out_put_session;
2229
2230         status = nfserr_badslot;
2231         if (seq->slotid >= session->se_fchannel.maxreqs)
2232                 goto out_put_session;
2233
2234         slot = session->se_slots[seq->slotid];
2235         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2236
2237         /* We do not negotiate the number of slots yet, so set the
2238          * maxslots to the session maxreqs which is used to encode
2239          * sr_highest_slotid and the sr_target_slot id to maxslots */
2240         seq->maxslots = session->se_fchannel.maxreqs;
2241
2242         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2243                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2244         if (status == nfserr_replay_cache) {
2245                 status = nfserr_seq_misordered;
2246                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2247                         goto out_put_session;
2248                 cstate->slot = slot;
2249                 cstate->session = session;
2250                 /* Return the cached reply status and set cstate->status
2251                  * for nfsd4_proc_compound processing */
2252                 status = nfsd4_replay_cache_entry(resp, seq);
2253                 cstate->status = nfserr_replay_cache;
2254                 goto out;
2255         }
2256         if (status)
2257                 goto out_put_session;
2258
2259         status = nfsd4_sequence_check_conn(conn, session);
2260         conn = NULL;
2261         if (status)
2262                 goto out_put_session;
2263
2264         /* Success! bump slot seqid */
2265         slot->sl_seqid = seq->seqid;
2266         slot->sl_flags |= NFSD4_SLOT_INUSE;
2267         if (seq->cachethis)
2268                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2269         else
2270                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2271
2272         cstate->slot = slot;
2273         cstate->session = session;
2274
2275 out:
2276         switch (clp->cl_cb_state) {
2277         case NFSD4_CB_DOWN:
2278                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2279                 break;
2280         case NFSD4_CB_FAULT:
2281                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2282                 break;
2283         default:
2284                 seq->status_flags = 0;
2285         }
2286         if (!list_empty(&clp->cl_revoked))
2287                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2288 out_no_session:
2289         if (conn)
2290                 free_conn(conn);
2291         spin_unlock(&nn->client_lock);
2292         return status;
2293 out_put_session:
2294         nfsd4_put_session(session);
2295 out_put_client:
2296         put_client_renew_locked(clp);
2297         goto out_no_session;
2298 }
2299
2300 __be32
2301 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2302 {
2303         struct nfs4_client *conf, *unconf, *clp;
2304         __be32 status = 0;
2305         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2306
2307         nfs4_lock_state();
2308         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2309         conf = find_confirmed_client(&dc->clientid, true, nn);
2310         WARN_ON_ONCE(conf && unconf);
2311
2312         if (conf) {
2313                 clp = conf;
2314
2315                 if (client_has_state(conf)) {
2316                         status = nfserr_clientid_busy;
2317                         goto out;
2318                 }
2319         } else if (unconf)
2320                 clp = unconf;
2321         else {
2322                 status = nfserr_stale_clientid;
2323                 goto out;
2324         }
2325         if (!mach_creds_match(clp, rqstp)) {
2326                 status = nfserr_wrong_cred;
2327                 goto out;
2328         }
2329         expire_client(clp);
2330 out:
2331         nfs4_unlock_state();
2332         return status;
2333 }
2334
2335 __be32
2336 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2337 {
2338         __be32 status = 0;
2339
2340         if (rc->rca_one_fs) {
2341                 if (!cstate->current_fh.fh_dentry)
2342                         return nfserr_nofilehandle;
2343                 /*
2344                  * We don't take advantage of the rca_one_fs case.
2345                  * That's OK, it's optional, we can safely ignore it.
2346                  */
2347                  return nfs_ok;
2348         }
2349
2350         nfs4_lock_state();
2351         status = nfserr_complete_already;
2352         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2353                              &cstate->session->se_client->cl_flags))
2354                 goto out;
2355
2356         status = nfserr_stale_clientid;
2357         if (is_client_expired(cstate->session->se_client))
2358                 /*
2359                  * The following error isn't really legal.
2360                  * But we only get here if the client just explicitly
2361                  * destroyed the client.  Surely it no longer cares what
2362                  * error it gets back on an operation for the dead
2363                  * client.
2364                  */
2365                 goto out;
2366
2367         status = nfs_ok;
2368         nfsd4_client_record_create(cstate->session->se_client);
2369 out:
2370         nfs4_unlock_state();
2371         return status;
2372 }
2373
2374 __be32
2375 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2376                   struct nfsd4_setclientid *setclid)
2377 {
2378         struct xdr_netobj       clname = setclid->se_name;
2379         nfs4_verifier           clverifier = setclid->se_verf;
2380         struct nfs4_client      *conf, *unconf, *new;
2381         __be32                  status;
2382         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2383
2384         /* Cases below refer to rfc 3530 section 14.2.33: */
2385         nfs4_lock_state();
2386         conf = find_confirmed_client_by_name(&clname, nn);
2387         if (conf) {
2388                 /* case 0: */
2389                 status = nfserr_clid_inuse;
2390                 if (clp_used_exchangeid(conf))
2391                         goto out;
2392                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2393                         char addr_str[INET6_ADDRSTRLEN];
2394                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2395                                  sizeof(addr_str));
2396                         dprintk("NFSD: setclientid: string in use by client "
2397                                 "at %s\n", addr_str);
2398                         goto out;
2399                 }
2400         }
2401         unconf = find_unconfirmed_client_by_name(&clname, nn);
2402         if (unconf)
2403                 expire_client(unconf);
2404         status = nfserr_jukebox;
2405         new = create_client(clname, rqstp, &clverifier);
2406         if (new == NULL)
2407                 goto out;
2408         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2409                 /* case 1: probable callback update */
2410                 copy_clid(new, conf);
2411         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2412                 gen_clid(new, nn);
2413         new->cl_minorversion = 0;
2414         gen_callback(new, setclid, rqstp);
2415         add_to_unconfirmed(new);
2416         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2417         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2418         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2419         status = nfs_ok;
2420 out:
2421         nfs4_unlock_state();
2422         return status;
2423 }
2424
2425
2426 __be32
2427 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2428                          struct nfsd4_compound_state *cstate,
2429                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2430 {
2431         struct nfs4_client *conf, *unconf;
2432         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
2433         clientid_t * clid = &setclientid_confirm->sc_clientid;
2434         __be32 status;
2435         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2436
2437         if (STALE_CLIENTID(clid, nn))
2438                 return nfserr_stale_clientid;
2439         nfs4_lock_state();
2440
2441         conf = find_confirmed_client(clid, false, nn);
2442         unconf = find_unconfirmed_client(clid, false, nn);
2443         /*
2444          * We try hard to give out unique clientid's, so if we get an
2445          * attempt to confirm the same clientid with a different cred,
2446          * there's a bug somewhere.  Let's charitably assume it's our
2447          * bug.
2448          */
2449         status = nfserr_serverfault;
2450         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2451                 goto out;
2452         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2453                 goto out;
2454         /* cases below refer to rfc 3530 section 14.2.34: */
2455         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2456                 if (conf && !unconf) /* case 2: probable retransmit */
2457                         status = nfs_ok;
2458                 else /* case 4: client hasn't noticed we rebooted yet? */
2459                         status = nfserr_stale_clientid;
2460                 goto out;
2461         }
2462         status = nfs_ok;
2463         if (conf) { /* case 1: callback update */
2464                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2465                 nfsd4_probe_callback(conf);
2466                 expire_client(unconf);
2467         } else { /* case 3: normal case; new or rebooted client */
2468                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2469                 if (conf) {
2470                         status = mark_client_expired(conf);
2471                         if (status)
2472                                 goto out;
2473                         expire_client(conf);
2474                 }
2475                 move_to_confirmed(unconf);
2476                 nfsd4_probe_callback(unconf);
2477         }
2478 out:
2479         nfs4_unlock_state();
2480         return status;
2481 }
2482
2483 static struct nfs4_file *nfsd4_alloc_file(void)
2484 {
2485         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2486 }
2487
2488 /* OPEN Share state helper functions */
2489 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2490 {
2491         unsigned int hashval = file_hashval(ino);
2492
2493         atomic_set(&fp->fi_ref, 1);
2494         INIT_LIST_HEAD(&fp->fi_stateids);
2495         INIT_LIST_HEAD(&fp->fi_delegations);
2496         fp->fi_inode = igrab(ino);
2497         fp->fi_had_conflict = false;
2498         fp->fi_lease = NULL;
2499         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2500         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2501         spin_lock(&recall_lock);
2502         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2503         spin_unlock(&recall_lock);
2504 }
2505
2506 static void
2507 nfsd4_free_slab(struct kmem_cache **slab)
2508 {
2509         if (*slab == NULL)
2510                 return;
2511         kmem_cache_destroy(*slab);
2512         *slab = NULL;
2513 }
2514
2515 void
2516 nfsd4_free_slabs(void)
2517 {
2518         nfsd4_free_slab(&openowner_slab);
2519         nfsd4_free_slab(&lockowner_slab);
2520         nfsd4_free_slab(&file_slab);
2521         nfsd4_free_slab(&stateid_slab);
2522         nfsd4_free_slab(&deleg_slab);
2523 }
2524
2525 int
2526 nfsd4_init_slabs(void)
2527 {
2528         openowner_slab = kmem_cache_create("nfsd4_openowners",
2529                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2530         if (openowner_slab == NULL)
2531                 goto out_nomem;
2532         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2533                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2534         if (lockowner_slab == NULL)
2535                 goto out_nomem;
2536         file_slab = kmem_cache_create("nfsd4_files",
2537                         sizeof(struct nfs4_file), 0, 0, NULL);
2538         if (file_slab == NULL)
2539                 goto out_nomem;
2540         stateid_slab = kmem_cache_create("nfsd4_stateids",
2541                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2542         if (stateid_slab == NULL)
2543                 goto out_nomem;
2544         deleg_slab = kmem_cache_create("nfsd4_delegations",
2545                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2546         if (deleg_slab == NULL)
2547                 goto out_nomem;
2548         return 0;
2549 out_nomem:
2550         nfsd4_free_slabs();
2551         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2552         return -ENOMEM;
2553 }
2554
2555 void nfs4_free_openowner(struct nfs4_openowner *oo)
2556 {
2557         kfree(oo->oo_owner.so_owner.data);
2558         kmem_cache_free(openowner_slab, oo);
2559 }
2560
2561 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2562 {
2563         kfree(lo->lo_owner.so_owner.data);
2564         kmem_cache_free(lockowner_slab, lo);
2565 }
2566
2567 static void init_nfs4_replay(struct nfs4_replay *rp)
2568 {
2569         rp->rp_status = nfserr_serverfault;
2570         rp->rp_buflen = 0;
2571         rp->rp_buf = rp->rp_ibuf;
2572 }
2573
2574 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2575 {
2576         struct nfs4_stateowner *sop;
2577
2578         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2579         if (!sop)
2580                 return NULL;
2581
2582         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2583         if (!sop->so_owner.data) {
2584                 kmem_cache_free(slab, sop);
2585                 return NULL;
2586         }
2587         sop->so_owner.len = owner->len;
2588
2589         INIT_LIST_HEAD(&sop->so_stateids);
2590         sop->so_client = clp;
2591         init_nfs4_replay(&sop->so_replay);
2592         return sop;
2593 }
2594
2595 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2596 {
2597         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2598
2599         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2600         list_add(&oo->oo_perclient, &clp->cl_openowners);
2601 }
2602
2603 static struct nfs4_openowner *
2604 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2605         struct nfs4_openowner *oo;
2606
2607         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2608         if (!oo)
2609                 return NULL;
2610         oo->oo_owner.so_is_open_owner = 1;
2611         oo->oo_owner.so_seqid = open->op_seqid;
2612         oo->oo_flags = NFS4_OO_NEW;
2613         oo->oo_time = 0;
2614         oo->oo_last_closed_stid = NULL;
2615         INIT_LIST_HEAD(&oo->oo_close_lru);
2616         hash_openowner(oo, clp, strhashval);
2617         return oo;
2618 }
2619
2620 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2621         struct nfs4_openowner *oo = open->op_openowner;
2622
2623         stp->st_stid.sc_type = NFS4_OPEN_STID;
2624         INIT_LIST_HEAD(&stp->st_lockowners);
2625         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2626         list_add(&stp->st_perfile, &fp->fi_stateids);
2627         stp->st_stateowner = &oo->oo_owner;
2628         get_nfs4_file(fp);
2629         stp->st_file = fp;
2630         stp->st_access_bmap = 0;
2631         stp->st_deny_bmap = 0;
2632         set_access(open->op_share_access, stp);
2633         set_deny(open->op_share_deny, stp);
2634         stp->st_openstp = NULL;
2635 }
2636
2637 static void
2638 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2639 {
2640         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2641
2642         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2643
2644         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2645         oo->oo_time = get_seconds();
2646 }
2647
2648 static int
2649 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2650                                                         clientid_t *clid)
2651 {
2652         return (sop->so_owner.len == owner->len) &&
2653                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2654                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2655 }
2656
2657 static struct nfs4_openowner *
2658 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2659                         bool sessions, struct nfsd_net *nn)
2660 {
2661         struct nfs4_stateowner *so;
2662         struct nfs4_openowner *oo;
2663         struct nfs4_client *clp;
2664
2665         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2666                 if (!so->so_is_open_owner)
2667                         continue;
2668                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2669                         oo = openowner(so);
2670                         clp = oo->oo_owner.so_client;
2671                         if ((bool)clp->cl_minorversion != sessions)
2672                                 return NULL;
2673                         renew_client(oo->oo_owner.so_client);
2674                         return oo;
2675                 }
2676         }
2677         return NULL;
2678 }
2679
2680 /* search file_hashtbl[] for file */
2681 static struct nfs4_file *
2682 find_file(struct inode *ino)
2683 {
2684         unsigned int hashval = file_hashval(ino);
2685         struct nfs4_file *fp;
2686
2687         spin_lock(&recall_lock);
2688         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2689                 if (fp->fi_inode == ino) {
2690                         get_nfs4_file(fp);
2691                         spin_unlock(&recall_lock);
2692                         return fp;
2693                 }
2694         }
2695         spin_unlock(&recall_lock);
2696         return NULL;
2697 }
2698
2699 /*
2700  * Called to check deny when READ with all zero stateid or
2701  * WRITE with all zero or all one stateid
2702  */
2703 static __be32
2704 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2705 {
2706         struct inode *ino = current_fh->fh_dentry->d_inode;
2707         struct nfs4_file *fp;
2708         struct nfs4_ol_stateid *stp;
2709         __be32 ret;
2710
2711         fp = find_file(ino);
2712         if (!fp)
2713                 return nfs_ok;
2714         ret = nfserr_locked;
2715         /* Search for conflicting share reservations */
2716         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2717                 if (test_deny(deny_type, stp) ||
2718                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2719                         goto out;
2720         }
2721         ret = nfs_ok;
2722 out:
2723         put_nfs4_file(fp);
2724         return ret;
2725 }
2726
2727 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2728 {
2729         struct nfs4_client *clp = dp->dl_stid.sc_client;
2730         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2731
2732         /* We're assuming the state code never drops its reference
2733          * without first removing the lease.  Since we're in this lease
2734          * callback (and since the lease code is serialized by the kernel
2735          * lock) we know the server hasn't removed the lease yet, we know
2736          * it's safe to take a reference: */
2737         atomic_inc(&dp->dl_count);
2738
2739         list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2740
2741         /* Only place dl_time is set; protected by i_lock: */
2742         dp->dl_time = get_seconds();
2743
2744         nfsd4_cb_recall(dp);
2745 }
2746
2747 /* Called from break_lease() with i_lock held. */
2748 static void nfsd_break_deleg_cb(struct file_lock *fl)
2749 {
2750         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2751         struct nfs4_delegation *dp;
2752
2753         if (!fp) {
2754                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2755                 return;
2756         }
2757         if (fp->fi_had_conflict) {
2758                 WARN(1, "duplicate break on %p\n", fp);
2759                 return;
2760         }
2761         /*
2762          * We don't want the locks code to timeout the lease for us;
2763          * we'll remove it ourself if a delegation isn't returned
2764          * in time:
2765          */
2766         fl->fl_break_time = 0;
2767
2768         spin_lock(&recall_lock);
2769         fp->fi_had_conflict = true;
2770         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2771                 nfsd_break_one_deleg(dp);
2772         spin_unlock(&recall_lock);
2773 }
2774
2775 static
2776 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2777 {
2778         if (arg & F_UNLCK)
2779                 return lease_modify(onlist, arg);
2780         else
2781                 return -EAGAIN;
2782 }
2783
2784 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2785         .lm_break = nfsd_break_deleg_cb,
2786         .lm_change = nfsd_change_deleg_cb,
2787 };
2788
2789 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2790 {
2791         if (nfsd4_has_session(cstate))
2792                 return nfs_ok;
2793         if (seqid == so->so_seqid - 1)
2794                 return nfserr_replay_me;
2795         if (seqid == so->so_seqid)
2796                 return nfs_ok;
2797         return nfserr_bad_seqid;
2798 }
2799
2800 __be32
2801 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2802                     struct nfsd4_open *open, struct nfsd_net *nn)
2803 {
2804         clientid_t *clientid = &open->op_clientid;
2805         struct nfs4_client *clp = NULL;
2806         unsigned int strhashval;
2807         struct nfs4_openowner *oo = NULL;
2808         __be32 status;
2809
2810         if (STALE_CLIENTID(&open->op_clientid, nn))
2811                 return nfserr_stale_clientid;
2812         /*
2813          * In case we need it later, after we've already created the
2814          * file and don't want to risk a further failure:
2815          */
2816         open->op_file = nfsd4_alloc_file();
2817         if (open->op_file == NULL)
2818                 return nfserr_jukebox;
2819
2820         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2821         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2822         open->op_openowner = oo;
2823         if (!oo) {
2824                 clp = find_confirmed_client(clientid, cstate->minorversion,
2825                                             nn);
2826                 if (clp == NULL)
2827                         return nfserr_expired;
2828                 goto new_owner;
2829         }
2830         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2831                 /* Replace unconfirmed owners without checking for replay. */
2832                 clp = oo->oo_owner.so_client;
2833                 release_openowner(oo);
2834                 open->op_openowner = NULL;
2835                 goto new_owner;
2836         }
2837         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2838         if (status)
2839                 return status;
2840         clp = oo->oo_owner.so_client;
2841         goto alloc_stateid;
2842 new_owner:
2843         oo = alloc_init_open_stateowner(strhashval, clp, open);
2844         if (oo == NULL)
2845                 return nfserr_jukebox;
2846         open->op_openowner = oo;
2847 alloc_stateid:
2848         open->op_stp = nfs4_alloc_stateid(clp);
2849         if (!open->op_stp)
2850                 return nfserr_jukebox;
2851         return nfs_ok;
2852 }
2853
2854 static inline __be32
2855 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2856 {
2857         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2858                 return nfserr_openmode;
2859         else
2860                 return nfs_ok;
2861 }
2862
2863 static int share_access_to_flags(u32 share_access)
2864 {
2865         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2866 }
2867
2868 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2869 {
2870         struct nfs4_stid *ret;
2871
2872         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2873         if (!ret)
2874                 return NULL;
2875         return delegstateid(ret);
2876 }
2877
2878 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2879 {
2880         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2881                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2882 }
2883
2884 static __be32
2885 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2886                 struct nfs4_delegation **dp)
2887 {
2888         int flags;
2889         __be32 status = nfserr_bad_stateid;
2890
2891         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2892         if (*dp == NULL)
2893                 goto out;
2894         flags = share_access_to_flags(open->op_share_access);
2895         status = nfs4_check_delegmode(*dp, flags);
2896         if (status)
2897                 *dp = NULL;
2898 out:
2899         if (!nfsd4_is_deleg_cur(open))
2900                 return nfs_ok;
2901         if (status)
2902                 return status;
2903         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2904         return nfs_ok;
2905 }
2906
2907 static __be32
2908 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2909 {
2910         struct nfs4_ol_stateid *local;
2911         struct nfs4_openowner *oo = open->op_openowner;
2912
2913         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2914                 /* ignore lock owners */
2915                 if (local->st_stateowner->so_is_open_owner == 0)
2916                         continue;
2917                 /* remember if we have seen this open owner */
2918                 if (local->st_stateowner == &oo->oo_owner)
2919                         *stpp = local;
2920                 /* check for conflicting share reservations */
2921                 if (!test_share(local, open))
2922                         return nfserr_share_denied;
2923         }
2924         return nfs_ok;
2925 }
2926
2927 static inline int nfs4_access_to_access(u32 nfs4_access)
2928 {
2929         int flags = 0;
2930
2931         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2932                 flags |= NFSD_MAY_READ;
2933         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2934                 flags |= NFSD_MAY_WRITE;
2935         return flags;
2936 }
2937
2938 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2939                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2940 {
2941         __be32 status;
2942         int oflag = nfs4_access_to_omode(open->op_share_access);
2943         int access = nfs4_access_to_access(open->op_share_access);
2944
2945         if (!fp->fi_fds[oflag]) {
2946                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2947                         &fp->fi_fds[oflag]);
2948                 if (status)
2949                         return status;
2950         }
2951         nfs4_file_get_access(fp, oflag);
2952
2953         return nfs_ok;
2954 }
2955
2956 static inline __be32
2957 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2958                 struct nfsd4_open *open)
2959 {
2960         struct iattr iattr = {
2961                 .ia_valid = ATTR_SIZE,
2962                 .ia_size = 0,
2963         };
2964         if (!open->op_truncate)
2965                 return 0;
2966         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2967                 return nfserr_inval;
2968         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2969 }
2970
2971 static __be32
2972 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)
2973 {
2974         u32 op_share_access = open->op_share_access;
2975         bool new_access;
2976         __be32 status;
2977
2978         new_access = !test_access(op_share_access, stp);
2979         if (new_access) {
2980                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2981                 if (status)
2982                         return status;
2983         }
2984         status = nfsd4_truncate(rqstp, cur_fh, open);
2985         if (status) {
2986                 if (new_access) {
2987                         int oflag = nfs4_access_to_omode(op_share_access);
2988                         nfs4_file_put_access(fp, oflag);
2989                 }
2990                 return status;
2991         }
2992         /* remember the open */
2993         set_access(op_share_access, stp);
2994         set_deny(open->op_share_deny, stp);
2995
2996         return nfs_ok;
2997 }
2998
2999
3000 static void
3001 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3002 {
3003         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3004 }
3005
3006 /* Should we give out recallable state?: */
3007 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3008 {
3009         if (clp->cl_cb_state == NFSD4_CB_UP)
3010                 return true;
3011         /*
3012          * In the sessions case, since we don't have to establish a
3013          * separate connection for callbacks, we assume it's OK
3014          * until we hear otherwise:
3015          */
3016         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3017 }
3018
3019 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3020 {
3021         struct file_lock *fl;
3022
3023         fl = locks_alloc_lock();
3024         if (!fl)
3025                 return NULL;
3026         locks_init_lock(fl);
3027         fl->fl_lmops = &nfsd_lease_mng_ops;
3028         fl->fl_flags = FL_DELEG;
3029         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3030         fl->fl_end = OFFSET_MAX;
3031         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3032         fl->fl_pid = current->tgid;
3033         return fl;
3034 }
3035
3036 static int nfs4_setlease(struct nfs4_delegation *dp)
3037 {
3038         struct nfs4_file *fp = dp->dl_file;
3039         struct file_lock *fl;
3040         int status;
3041
3042         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3043         if (!fl)
3044                 return -ENOMEM;
3045         fl->fl_file = find_readable_file(fp);
3046         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3047         if (status)
3048                 goto out_free;
3049         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3050         fp->fi_lease = fl;
3051         fp->fi_deleg_file = get_file(fl->fl_file);
3052         atomic_set(&fp->fi_delegees, 1);
3053         list_add(&dp->dl_perfile, &fp->fi_delegations);
3054         return 0;
3055 out_free:
3056         locks_free_lock(fl);
3057         return status;
3058 }
3059
3060 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3061 {
3062         int status;
3063
3064         if (fp->fi_had_conflict)
3065                 return -EAGAIN;
3066         get_nfs4_file(fp);
3067         dp->dl_file = fp;
3068         if (!fp->fi_lease) {
3069                 status = nfs4_setlease(dp);
3070                 if (status)
3071                         goto out_free;
3072                 return 0;
3073         }
3074         spin_lock(&recall_lock);
3075         if (fp->fi_had_conflict) {
3076                 spin_unlock(&recall_lock);
3077                 status = -EAGAIN;
3078                 goto out_free;
3079         }
3080         atomic_inc(&fp->fi_delegees);
3081         list_add(&dp->dl_perfile, &fp->fi_delegations);
3082         spin_unlock(&recall_lock);
3083         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3084         return 0;
3085 out_free:
3086         put_nfs4_file(fp);
3087         dp->dl_file = fp;
3088         return status;
3089 }
3090
3091 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3092 {
3093         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3094         if (status == -EAGAIN)
3095                 open->op_why_no_deleg = WND4_CONTENTION;
3096         else {
3097                 open->op_why_no_deleg = WND4_RESOURCE;
3098                 switch (open->op_deleg_want) {
3099                 case NFS4_SHARE_WANT_READ_DELEG:
3100                 case NFS4_SHARE_WANT_WRITE_DELEG:
3101                 case NFS4_SHARE_WANT_ANY_DELEG:
3102                         break;
3103                 case NFS4_SHARE_WANT_CANCEL:
3104                         open->op_why_no_deleg = WND4_CANCELLED;
3105                         break;
3106                 case NFS4_SHARE_WANT_NO_DELEG:
3107                         WARN_ON_ONCE(1);
3108                 }
3109         }
3110 }
3111
3112 /*
3113  * Attempt to hand out a delegation.
3114  *
3115  * Note we don't support write delegations, and won't until the vfs has
3116  * proper support for them.
3117  */
3118 static void
3119 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3120                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3121 {
3122         struct nfs4_delegation *dp;
3123         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3124         int cb_up;
3125         int status = 0;
3126
3127         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3128         open->op_recall = 0;
3129         switch (open->op_claim_type) {
3130                 case NFS4_OPEN_CLAIM_PREVIOUS:
3131                         if (!cb_up)
3132                                 open->op_recall = 1;
3133                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3134                                 goto out_no_deleg;
3135                         break;
3136                 case NFS4_OPEN_CLAIM_NULL:
3137                 case NFS4_OPEN_CLAIM_FH:
3138                         /*
3139                          * Let's not give out any delegations till everyone's
3140                          * had the chance to reclaim theirs....
3141                          */
3142                         if (locks_in_grace(net))
3143                                 goto out_no_deleg;
3144                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3145                                 goto out_no_deleg;
3146                         /*
3147                          * Also, if the file was opened for write or
3148                          * create, there's a good chance the client's
3149                          * about to write to it, resulting in an
3150                          * immediate recall (since we don't support
3151                          * write delegations):
3152                          */
3153                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3154                                 goto out_no_deleg;
3155                         if (open->op_create == NFS4_OPEN_CREATE)
3156                                 goto out_no_deleg;
3157                         break;
3158                 default:
3159                         goto out_no_deleg;
3160         }
3161         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3162         if (dp == NULL)
3163                 goto out_no_deleg;
3164         status = nfs4_set_delegation(dp, stp->st_file);
3165         if (status)
3166                 goto out_free;
3167
3168         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3169
3170         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3171                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3172         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3173         return;
3174 out_free:
3175         remove_stid(&dp->dl_stid);
3176         nfs4_put_delegation(dp);
3177 out_no_deleg:
3178         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3179         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3180             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3181                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3182                 open->op_recall = 1;
3183         }
3184
3185         /* 4.1 client asking for a delegation? */
3186         if (open->op_deleg_want)
3187                 nfsd4_open_deleg_none_ext(open, status);
3188         return;
3189 }
3190
3191 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3192                                         struct nfs4_delegation *dp)
3193 {
3194         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3195             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3196                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3197                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3198         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3199                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3200                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3201                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3202         }
3203         /* Otherwise the client must be confused wanting a delegation
3204          * it already has, therefore we don't return
3205          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3206          */
3207 }
3208
3209 /*
3210  * called with nfs4_lock_state() held.
3211  */
3212 __be32
3213 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3214 {
3215         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3216         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3217         struct nfs4_file *fp = NULL;
3218         struct inode *ino = current_fh->fh_dentry->d_inode;
3219         struct nfs4_ol_stateid *stp = NULL;
3220         struct nfs4_delegation *dp = NULL;
3221         __be32 status;
3222
3223         /*
3224          * Lookup file; if found, lookup stateid and check open request,
3225          * and check for delegations in the process of being recalled.
3226          * If not found, create the nfs4_file struct
3227          */
3228         fp = find_file(ino);
3229         if (fp) {
3230                 if ((status = nfs4_check_open(fp, open, &stp)))
3231                         goto out;
3232                 status = nfs4_check_deleg(cl, open, &dp);
3233                 if (status)
3234                         goto out;
3235         } else {
3236                 status = nfserr_bad_stateid;
3237                 if (nfsd4_is_deleg_cur(open))
3238                         goto out;
3239                 status = nfserr_jukebox;
3240                 fp = open->op_file;
3241                 open->op_file = NULL;
3242                 nfsd4_init_file(fp, ino);
3243         }
3244
3245         /*
3246          * OPEN the file, or upgrade an existing OPEN.
3247          * If truncate fails, the OPEN fails.
3248          */
3249         if (stp) {
3250                 /* Stateid was found, this is an OPEN upgrade */
3251                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3252                 if (status)
3253                         goto out;
3254         } else {
3255                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3256                 if (status)
3257                         goto out;
3258                 status = nfsd4_truncate(rqstp, current_fh, open);
3259                 if (status)
3260                         goto out;
3261                 stp = open->op_stp;
3262                 open->op_stp = NULL;
3263                 init_open_stateid(stp, fp, open);
3264         }
3265         update_stateid(&stp->st_stid.sc_stateid);
3266         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3267
3268         if (nfsd4_has_session(&resp->cstate)) {
3269                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3270
3271                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3272                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3273                         open->op_why_no_deleg = WND4_NOT_WANTED;
3274                         goto nodeleg;
3275                 }
3276         }
3277
3278         /*
3279         * Attempt to hand out a delegation. No error return, because the
3280         * OPEN succeeds even if we fail.
3281         */
3282         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3283 nodeleg:
3284         status = nfs_ok;
3285
3286         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3287                 STATEID_VAL(&stp->st_stid.sc_stateid));
3288 out:
3289         /* 4.1 client trying to upgrade/downgrade delegation? */
3290         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3291             open->op_deleg_want)
3292                 nfsd4_deleg_xgrade_none_ext(open, dp);
3293
3294         if (fp)
3295                 put_nfs4_file(fp);
3296         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3297                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3298         /*
3299         * To finish the open response, we just need to set the rflags.
3300         */
3301         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3302         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3303             !nfsd4_has_session(&resp->cstate))
3304                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3305
3306         return status;
3307 }
3308
3309 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3310 {
3311         if (open->op_openowner) {
3312                 struct nfs4_openowner *oo = open->op_openowner;
3313
3314                 if (!list_empty(&oo->oo_owner.so_stateids))
3315                         list_del_init(&oo->oo_close_lru);
3316                 if (oo->oo_flags & NFS4_OO_NEW) {
3317                         if (status) {
3318                                 release_openowner(oo);
3319                                 open->op_openowner = NULL;
3320                         } else
3321                                 oo->oo_flags &= ~NFS4_OO_NEW;
3322                 }
3323         }
3324         if (open->op_file)
3325                 nfsd4_free_file(open->op_file);
3326         if (open->op_stp)
3327                 free_generic_stateid(open->op_stp);
3328 }
3329
3330 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3331 {
3332         struct nfs4_client *found;
3333
3334         if (STALE_CLIENTID(clid, nn))
3335                 return nfserr_stale_clientid;
3336         found = find_confirmed_client(clid, session, nn);
3337         if (clp)
3338                 *clp = found;
3339         return found ? nfs_ok : nfserr_expired;
3340 }
3341
3342 __be32
3343 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3344             clientid_t *clid)
3345 {
3346         struct nfs4_client *clp;
3347         __be32 status;
3348         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3349
3350         nfs4_lock_state();
3351         dprintk("process_renew(%08x/%08x): starting\n", 
3352                         clid->cl_boot, clid->cl_id);
3353         status = lookup_clientid(clid, cstate->minorversion, nn, &clp);