nfsd: make client_lock per net
[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/clnt.h>
44 #include "xdr4.h"
45 #include "vfs.h"
46 #include "current_stateid.h"
47 #include "fault_inject.h"
48
49 #include "netns.h"
50
51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
52
53 /* Globals */
54 time_t nfsd4_lease = 90;     /* default lease time */
55 time_t nfsd4_grace = 90;
56
57 #define all_ones {{~0,~0},~0}
58 static const stateid_t one_stateid = {
59         .si_generation = ~0,
60         .si_opaque = all_ones,
61 };
62 static const stateid_t zero_stateid = {
63         /* all fields zero */
64 };
65 static const stateid_t currentstateid = {
66         .si_generation = 1,
67 };
68
69 static u64 current_sessionid = 1;
70
71 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
72 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
73 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
74
75 /* forward declarations */
76 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
77
78 /* Locking: */
79
80 /* Currently used for almost all code touching nfsv4 state: */
81 static DEFINE_MUTEX(client_mutex);
82
83 /*
84  * Currently used for the del_recall_lru and file hash table.  In an
85  * effort to decrease the scope of the client_mutex, this spinlock may
86  * eventually cover more:
87  */
88 static DEFINE_SPINLOCK(recall_lock);
89
90 static struct kmem_cache *openowner_slab = NULL;
91 static struct kmem_cache *lockowner_slab = NULL;
92 static struct kmem_cache *file_slab = NULL;
93 static struct kmem_cache *stateid_slab = NULL;
94 static struct kmem_cache *deleg_slab = NULL;
95
96 void
97 nfs4_lock_state(void)
98 {
99         mutex_lock(&client_mutex);
100 }
101
102 static void free_session(struct kref *);
103
104 /* Must be called under the client_lock */
105 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
106 {
107         kref_put(&ses->se_ref, free_session);
108 }
109
110 static void nfsd4_get_session(struct nfsd4_session *ses)
111 {
112         kref_get(&ses->se_ref);
113 }
114
115 void
116 nfs4_unlock_state(void)
117 {
118         mutex_unlock(&client_mutex);
119 }
120
121 static inline u32
122 opaque_hashval(const void *ptr, int nbytes)
123 {
124         unsigned char *cptr = (unsigned char *) ptr;
125
126         u32 x = 0;
127         while (nbytes--) {
128                 x *= 37;
129                 x += *cptr++;
130         }
131         return x;
132 }
133
134 static struct list_head del_recall_lru;
135
136 static void nfsd4_free_file(struct nfs4_file *f)
137 {
138         kmem_cache_free(file_slab, f);
139 }
140
141 static inline void
142 put_nfs4_file(struct nfs4_file *fi)
143 {
144         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
145                 list_del(&fi->fi_hash);
146                 spin_unlock(&recall_lock);
147                 iput(fi->fi_inode);
148                 nfsd4_free_file(fi);
149         }
150 }
151
152 static inline void
153 get_nfs4_file(struct nfs4_file *fi)
154 {
155         atomic_inc(&fi->fi_ref);
156 }
157
158 static int num_delegations;
159 unsigned int max_delegations;
160
161 /*
162  * Open owner state (share locks)
163  */
164
165 /* hash tables for lock and open owners */
166 #define OWNER_HASH_BITS              8
167 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
168 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
169
170 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
171 {
172         unsigned int ret;
173
174         ret = opaque_hashval(ownername->data, ownername->len);
175         ret += clientid;
176         return ret & OWNER_HASH_MASK;
177 }
178
179 /* hash table for nfs4_file */
180 #define FILE_HASH_BITS                   8
181 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
182
183 static unsigned int file_hashval(struct inode *ino)
184 {
185         /* XXX: why are we hashing on inode pointer, anyway? */
186         return hash_ptr(ino, FILE_HASH_BITS);
187 }
188
189 static struct list_head file_hashtbl[FILE_HASH_SIZE];
190
191 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
192 {
193         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
194         atomic_inc(&fp->fi_access[oflag]);
195 }
196
197 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
198 {
199         if (oflag == O_RDWR) {
200                 __nfs4_file_get_access(fp, O_RDONLY);
201                 __nfs4_file_get_access(fp, O_WRONLY);
202         } else
203                 __nfs4_file_get_access(fp, oflag);
204 }
205
206 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
207 {
208         if (fp->fi_fds[oflag]) {
209                 fput(fp->fi_fds[oflag]);
210                 fp->fi_fds[oflag] = NULL;
211         }
212 }
213
214 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
215 {
216         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
217                 nfs4_file_put_fd(fp, oflag);
218                 /*
219                  * It's also safe to get rid of the RDWR open *if*
220                  * we no longer have need of the other kind of access
221                  * or if we already have the other kind of open:
222                  */
223                 if (fp->fi_fds[1-oflag]
224                         || atomic_read(&fp->fi_access[1 - oflag]) == 0)
225                         nfs4_file_put_fd(fp, O_RDWR);
226         }
227 }
228
229 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
230 {
231         if (oflag == O_RDWR) {
232                 __nfs4_file_put_access(fp, O_RDONLY);
233                 __nfs4_file_put_access(fp, O_WRONLY);
234         } else
235                 __nfs4_file_put_access(fp, oflag);
236 }
237
238 static inline int get_new_stid(struct nfs4_stid *stid)
239 {
240         static int min_stateid = 0;
241         struct idr *stateids = &stid->sc_client->cl_stateids;
242         int new_stid;
243         int error;
244
245         error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
246         /*
247          * Note: the necessary preallocation was done in
248          * nfs4_alloc_stateid().  The idr code caps the number of
249          * preallocations that can exist at a time, but the state lock
250          * prevents anyone from using ours before we get here:
251          */
252         WARN_ON_ONCE(error);
253         /*
254          * It shouldn't be a problem to reuse an opaque stateid value.
255          * I don't think it is for 4.1.  But with 4.0 I worry that, for
256          * example, a stray write retransmission could be accepted by
257          * the server when it should have been rejected.  Therefore,
258          * adopt a trick from the sctp code to attempt to maximize the
259          * amount of time until an id is reused, by ensuring they always
260          * "increase" (mod INT_MAX):
261          */
262
263         min_stateid = new_stid+1;
264         if (min_stateid == INT_MAX)
265                 min_stateid = 0;
266         return new_stid;
267 }
268
269 static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
270 {
271         stateid_t *s = &stid->sc_stateid;
272         int new_id;
273
274         stid->sc_type = type;
275         stid->sc_client = cl;
276         s->si_opaque.so_clid = cl->cl_clientid;
277         new_id = get_new_stid(stid);
278         s->si_opaque.so_id = (u32)new_id;
279         /* Will be incremented before return to client: */
280         s->si_generation = 0;
281 }
282
283 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
284 {
285         struct idr *stateids = &cl->cl_stateids;
286
287         if (!idr_pre_get(stateids, GFP_KERNEL))
288                 return NULL;
289         /*
290          * Note: if we fail here (or any time between now and the time
291          * we actually get the new idr), we won't need to undo the idr
292          * preallocation, since the idr code caps the number of
293          * preallocated entries.
294          */
295         return kmem_cache_alloc(slab, GFP_KERNEL);
296 }
297
298 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
299 {
300         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
301 }
302
303 static struct nfs4_delegation *
304 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
305 {
306         struct nfs4_delegation *dp;
307         struct nfs4_file *fp = stp->st_file;
308
309         dprintk("NFSD alloc_init_deleg\n");
310         /*
311          * Major work on the lease subsystem (for example, to support
312          * calbacks on stat) will be required before we can support
313          * write delegations properly.
314          */
315         if (type != NFS4_OPEN_DELEGATE_READ)
316                 return NULL;
317         if (fp->fi_had_conflict)
318                 return NULL;
319         if (num_delegations > max_delegations)
320                 return NULL;
321         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
322         if (dp == NULL)
323                 return dp;
324         init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
325         /*
326          * delegation seqid's are never incremented.  The 4.1 special
327          * meaning of seqid 0 isn't meaningful, really, but let's avoid
328          * 0 anyway just for consistency and use 1:
329          */
330         dp->dl_stid.sc_stateid.si_generation = 1;
331         num_delegations++;
332         INIT_LIST_HEAD(&dp->dl_perfile);
333         INIT_LIST_HEAD(&dp->dl_perclnt);
334         INIT_LIST_HEAD(&dp->dl_recall_lru);
335         get_nfs4_file(fp);
336         dp->dl_file = fp;
337         dp->dl_type = type;
338         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
339         dp->dl_time = 0;
340         atomic_set(&dp->dl_count, 1);
341         nfsd4_init_callback(&dp->dl_recall);
342         return dp;
343 }
344
345 void
346 nfs4_put_delegation(struct nfs4_delegation *dp)
347 {
348         if (atomic_dec_and_test(&dp->dl_count)) {
349                 dprintk("NFSD: freeing dp %p\n",dp);
350                 put_nfs4_file(dp->dl_file);
351                 kmem_cache_free(deleg_slab, dp);
352                 num_delegations--;
353         }
354 }
355
356 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
357 {
358         if (atomic_dec_and_test(&fp->fi_delegees)) {
359                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
360                 fp->fi_lease = NULL;
361                 fput(fp->fi_deleg_file);
362                 fp->fi_deleg_file = NULL;
363         }
364 }
365
366 static void unhash_stid(struct nfs4_stid *s)
367 {
368         struct idr *stateids = &s->sc_client->cl_stateids;
369
370         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
371 }
372
373 /* Called under the state lock. */
374 static void
375 unhash_delegation(struct nfs4_delegation *dp)
376 {
377         unhash_stid(&dp->dl_stid);
378         list_del_init(&dp->dl_perclnt);
379         spin_lock(&recall_lock);
380         list_del_init(&dp->dl_perfile);
381         list_del_init(&dp->dl_recall_lru);
382         spin_unlock(&recall_lock);
383         nfs4_put_deleg_lease(dp->dl_file);
384         nfs4_put_delegation(dp);
385 }
386
387 /* 
388  * SETCLIENTID state 
389  */
390
391 static unsigned int clientid_hashval(u32 id)
392 {
393         return id & CLIENT_HASH_MASK;
394 }
395
396 static unsigned int clientstr_hashval(const char *name)
397 {
398         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
399 }
400
401 /*
402  * We store the NONE, READ, WRITE, and BOTH bits separately in the
403  * st_{access,deny}_bmap field of the stateid, in order to track not
404  * only what share bits are currently in force, but also what
405  * combinations of share bits previous opens have used.  This allows us
406  * to enforce the recommendation of rfc 3530 14.2.19 that the server
407  * return an error if the client attempt to downgrade to a combination
408  * of share bits not explicable by closing some of its previous opens.
409  *
410  * XXX: This enforcement is actually incomplete, since we don't keep
411  * track of access/deny bit combinations; so, e.g., we allow:
412  *
413  *      OPEN allow read, deny write
414  *      OPEN allow both, deny none
415  *      DOWNGRADE allow read, deny none
416  *
417  * which we should reject.
418  */
419 static unsigned int
420 bmap_to_share_mode(unsigned long bmap) {
421         int i;
422         unsigned int access = 0;
423
424         for (i = 1; i < 4; i++) {
425                 if (test_bit(i, &bmap))
426                         access |= i;
427         }
428         return access;
429 }
430
431 static bool
432 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
433         unsigned int access, deny;
434
435         access = bmap_to_share_mode(stp->st_access_bmap);
436         deny = bmap_to_share_mode(stp->st_deny_bmap);
437         if ((access & open->op_share_deny) || (deny & open->op_share_access))
438                 return false;
439         return true;
440 }
441
442 /* set share access for a given stateid */
443 static inline void
444 set_access(u32 access, struct nfs4_ol_stateid *stp)
445 {
446         __set_bit(access, &stp->st_access_bmap);
447 }
448
449 /* clear share access for a given stateid */
450 static inline void
451 clear_access(u32 access, struct nfs4_ol_stateid *stp)
452 {
453         __clear_bit(access, &stp->st_access_bmap);
454 }
455
456 /* test whether a given stateid has access */
457 static inline bool
458 test_access(u32 access, struct nfs4_ol_stateid *stp)
459 {
460         return test_bit(access, &stp->st_access_bmap);
461 }
462
463 /* set share deny for a given stateid */
464 static inline void
465 set_deny(u32 access, struct nfs4_ol_stateid *stp)
466 {
467         __set_bit(access, &stp->st_deny_bmap);
468 }
469
470 /* clear share deny for a given stateid */
471 static inline void
472 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
473 {
474         __clear_bit(access, &stp->st_deny_bmap);
475 }
476
477 /* test whether a given stateid is denying specific access */
478 static inline bool
479 test_deny(u32 access, struct nfs4_ol_stateid *stp)
480 {
481         return test_bit(access, &stp->st_deny_bmap);
482 }
483
484 static int nfs4_access_to_omode(u32 access)
485 {
486         switch (access & NFS4_SHARE_ACCESS_BOTH) {
487         case NFS4_SHARE_ACCESS_READ:
488                 return O_RDONLY;
489         case NFS4_SHARE_ACCESS_WRITE:
490                 return O_WRONLY;
491         case NFS4_SHARE_ACCESS_BOTH:
492                 return O_RDWR;
493         }
494         WARN_ON_ONCE(1);
495         return O_RDONLY;
496 }
497
498 /* release all access and file references for a given stateid */
499 static void
500 release_all_access(struct nfs4_ol_stateid *stp)
501 {
502         int i;
503
504         for (i = 1; i < 4; i++) {
505                 if (test_access(i, stp))
506                         nfs4_file_put_access(stp->st_file,
507                                              nfs4_access_to_omode(i));
508                 clear_access(i, stp);
509         }
510 }
511
512 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
513 {
514         list_del(&stp->st_perfile);
515         list_del(&stp->st_perstateowner);
516 }
517
518 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
519 {
520         release_all_access(stp);
521         put_nfs4_file(stp->st_file);
522         stp->st_file = NULL;
523 }
524
525 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
526 {
527         kmem_cache_free(stateid_slab, stp);
528 }
529
530 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
531 {
532         struct file *file;
533
534         unhash_generic_stateid(stp);
535         unhash_stid(&stp->st_stid);
536         file = find_any_file(stp->st_file);
537         if (file)
538                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
539         close_generic_stateid(stp);
540         free_generic_stateid(stp);
541 }
542
543 static void unhash_lockowner(struct nfs4_lockowner *lo)
544 {
545         struct nfs4_ol_stateid *stp;
546
547         list_del(&lo->lo_owner.so_strhash);
548         list_del(&lo->lo_perstateid);
549         list_del(&lo->lo_owner_ino_hash);
550         while (!list_empty(&lo->lo_owner.so_stateids)) {
551                 stp = list_first_entry(&lo->lo_owner.so_stateids,
552                                 struct nfs4_ol_stateid, st_perstateowner);
553                 release_lock_stateid(stp);
554         }
555 }
556
557 static void release_lockowner(struct nfs4_lockowner *lo)
558 {
559         unhash_lockowner(lo);
560         nfs4_free_lockowner(lo);
561 }
562
563 static void
564 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
565 {
566         struct nfs4_lockowner *lo;
567
568         while (!list_empty(&open_stp->st_lockowners)) {
569                 lo = list_entry(open_stp->st_lockowners.next,
570                                 struct nfs4_lockowner, lo_perstateid);
571                 release_lockowner(lo);
572         }
573 }
574
575 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
576 {
577         unhash_generic_stateid(stp);
578         release_stateid_lockowners(stp);
579         close_generic_stateid(stp);
580 }
581
582 static void release_open_stateid(struct nfs4_ol_stateid *stp)
583 {
584         unhash_open_stateid(stp);
585         unhash_stid(&stp->st_stid);
586         free_generic_stateid(stp);
587 }
588
589 static void unhash_openowner(struct nfs4_openowner *oo)
590 {
591         struct nfs4_ol_stateid *stp;
592
593         list_del(&oo->oo_owner.so_strhash);
594         list_del(&oo->oo_perclient);
595         while (!list_empty(&oo->oo_owner.so_stateids)) {
596                 stp = list_first_entry(&oo->oo_owner.so_stateids,
597                                 struct nfs4_ol_stateid, st_perstateowner);
598                 release_open_stateid(stp);
599         }
600 }
601
602 static void release_last_closed_stateid(struct nfs4_openowner *oo)
603 {
604         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
605
606         if (s) {
607                 unhash_stid(&s->st_stid);
608                 free_generic_stateid(s);
609                 oo->oo_last_closed_stid = NULL;
610         }
611 }
612
613 static void release_openowner(struct nfs4_openowner *oo)
614 {
615         unhash_openowner(oo);
616         list_del(&oo->oo_close_lru);
617         release_last_closed_stateid(oo);
618         nfs4_free_openowner(oo);
619 }
620
621 static inline int
622 hash_sessionid(struct nfs4_sessionid *sessionid)
623 {
624         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
625
626         return sid->sequence % SESSION_HASH_SIZE;
627 }
628
629 #ifdef NFSD_DEBUG
630 static inline void
631 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
632 {
633         u32 *ptr = (u32 *)(&sessionid->data[0]);
634         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
635 }
636 #else
637 static inline void
638 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
639 {
640 }
641 #endif
642
643
644 static void
645 gen_sessionid(struct nfsd4_session *ses)
646 {
647         struct nfs4_client *clp = ses->se_client;
648         struct nfsd4_sessionid *sid;
649
650         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
651         sid->clientid = clp->cl_clientid;
652         sid->sequence = current_sessionid++;
653         sid->reserved = 0;
654 }
655
656 /*
657  * The protocol defines ca_maxresponssize_cached to include the size of
658  * the rpc header, but all we need to cache is the data starting after
659  * the end of the initial SEQUENCE operation--the rest we regenerate
660  * each time.  Therefore we can advertise a ca_maxresponssize_cached
661  * value that is the number of bytes in our cache plus a few additional
662  * bytes.  In order to stay on the safe side, and not promise more than
663  * we can cache, those additional bytes must be the minimum possible: 24
664  * bytes of rpc header (xid through accept state, with AUTH_NULL
665  * verifier), 12 for the compound header (with zero-length tag), and 44
666  * for the SEQUENCE op response:
667  */
668 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
669
670 static void
671 free_session_slots(struct nfsd4_session *ses)
672 {
673         int i;
674
675         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
676                 kfree(ses->se_slots[i]);
677 }
678
679 /*
680  * We don't actually need to cache the rpc and session headers, so we
681  * can allocate a little less for each slot:
682  */
683 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
684 {
685         return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
686 }
687
688 static int nfsd4_sanitize_slot_size(u32 size)
689 {
690         size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
691         size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
692
693         return size;
694 }
695
696 /*
697  * XXX: If we run out of reserved DRC memory we could (up to a point)
698  * re-negotiate active sessions and reduce their slot usage to make
699  * room for new connections. For now we just fail the create session.
700  */
701 static int nfsd4_get_drc_mem(int slotsize, u32 num)
702 {
703         int avail;
704
705         num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
706
707         spin_lock(&nfsd_drc_lock);
708         avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
709                         nfsd_drc_max_mem - nfsd_drc_mem_used);
710         num = min_t(int, num, avail / slotsize);
711         nfsd_drc_mem_used += num * slotsize;
712         spin_unlock(&nfsd_drc_lock);
713
714         return num;
715 }
716
717 static void nfsd4_put_drc_mem(int slotsize, int num)
718 {
719         spin_lock(&nfsd_drc_lock);
720         nfsd_drc_mem_used -= slotsize * num;
721         spin_unlock(&nfsd_drc_lock);
722 }
723
724 static struct nfsd4_session *__alloc_session(int slotsize, int numslots)
725 {
726         struct nfsd4_session *new;
727         int mem, i;
728
729         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
730                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
731         mem = numslots * sizeof(struct nfsd4_slot *);
732
733         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
734         if (!new)
735                 return NULL;
736         /* allocate each struct nfsd4_slot and data cache in one piece */
737         for (i = 0; i < numslots; i++) {
738                 mem = sizeof(struct nfsd4_slot) + slotsize;
739                 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
740                 if (!new->se_slots[i])
741                         goto out_free;
742         }
743         return new;
744 out_free:
745         while (i--)
746                 kfree(new->se_slots[i]);
747         kfree(new);
748         return NULL;
749 }
750
751 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
752 {
753         u32 maxrpc = nfsd_serv->sv_max_mesg;
754
755         new->maxreqs = numslots;
756         new->maxresp_cached = min_t(u32, req->maxresp_cached,
757                                         slotsize + NFSD_MIN_HDR_SEQ_SZ);
758         new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
759         new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
760         new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
761 }
762
763 static void free_conn(struct nfsd4_conn *c)
764 {
765         svc_xprt_put(c->cn_xprt);
766         kfree(c);
767 }
768
769 static void nfsd4_conn_lost(struct svc_xpt_user *u)
770 {
771         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
772         struct nfs4_client *clp = c->cn_session->se_client;
773
774         spin_lock(&clp->cl_lock);
775         if (!list_empty(&c->cn_persession)) {
776                 list_del(&c->cn_persession);
777                 free_conn(c);
778         }
779         spin_unlock(&clp->cl_lock);
780         nfsd4_probe_callback(clp);
781 }
782
783 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
784 {
785         struct nfsd4_conn *conn;
786
787         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
788         if (!conn)
789                 return NULL;
790         svc_xprt_get(rqstp->rq_xprt);
791         conn->cn_xprt = rqstp->rq_xprt;
792         conn->cn_flags = flags;
793         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
794         return conn;
795 }
796
797 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
798 {
799         conn->cn_session = ses;
800         list_add(&conn->cn_persession, &ses->se_conns);
801 }
802
803 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
804 {
805         struct nfs4_client *clp = ses->se_client;
806
807         spin_lock(&clp->cl_lock);
808         __nfsd4_hash_conn(conn, ses);
809         spin_unlock(&clp->cl_lock);
810 }
811
812 static int nfsd4_register_conn(struct nfsd4_conn *conn)
813 {
814         conn->cn_xpt_user.callback = nfsd4_conn_lost;
815         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
816 }
817
818 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
819 {
820         int ret;
821
822         nfsd4_hash_conn(conn, ses);
823         ret = nfsd4_register_conn(conn);
824         if (ret)
825                 /* oops; xprt is already down: */
826                 nfsd4_conn_lost(&conn->cn_xpt_user);
827         if (conn->cn_flags & NFS4_CDFC4_BACK) {
828                 /* callback channel may be back up */
829                 nfsd4_probe_callback(ses->se_client);
830         }
831 }
832
833 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
834 {
835         u32 dir = NFS4_CDFC4_FORE;
836
837         if (cses->flags & SESSION4_BACK_CHAN)
838                 dir |= NFS4_CDFC4_BACK;
839         return alloc_conn(rqstp, dir);
840 }
841
842 /* must be called under client_lock */
843 static void nfsd4_del_conns(struct nfsd4_session *s)
844 {
845         struct nfs4_client *clp = s->se_client;
846         struct nfsd4_conn *c;
847
848         spin_lock(&clp->cl_lock);
849         while (!list_empty(&s->se_conns)) {
850                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
851                 list_del_init(&c->cn_persession);
852                 spin_unlock(&clp->cl_lock);
853
854                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
855                 free_conn(c);
856
857                 spin_lock(&clp->cl_lock);
858         }
859         spin_unlock(&clp->cl_lock);
860 }
861
862 static void __free_session(struct nfsd4_session *ses)
863 {
864         nfsd4_put_drc_mem(slot_bytes(&ses->se_fchannel), ses->se_fchannel.maxreqs);
865         free_session_slots(ses);
866         kfree(ses);
867 }
868
869 static void free_session(struct kref *kref)
870 {
871         struct nfsd4_session *ses;
872         struct nfsd_net *nn;
873
874         ses = container_of(kref, struct nfsd4_session, se_ref);
875         nn = net_generic(ses->se_client->net, nfsd_net_id);
876
877         lockdep_assert_held(&nn->client_lock);
878         nfsd4_del_conns(ses);
879         __free_session(ses);
880 }
881
882 void nfsd4_put_session(struct nfsd4_session *ses)
883 {
884         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
885
886         spin_lock(&nn->client_lock);
887         nfsd4_put_session_locked(ses);
888         spin_unlock(&nn->client_lock);
889 }
890
891 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
892 {
893         struct nfsd4_session *new;
894         int numslots, slotsize;
895         /*
896          * Note decreasing slot size below client's request may
897          * make it difficult for client to function correctly, whereas
898          * decreasing the number of slots will (just?) affect
899          * performance.  When short on memory we therefore prefer to
900          * decrease number of slots instead of their size.
901          */
902         slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
903         numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
904         if (numslots < 1)
905                 return NULL;
906
907         new = __alloc_session(slotsize, numslots);
908         if (!new) {
909                 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
910                 return NULL;
911         }
912         init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
913         return new;
914 }
915
916 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
917 {
918         int idx;
919         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
920
921         new->se_client = clp;
922         gen_sessionid(new);
923
924         INIT_LIST_HEAD(&new->se_conns);
925
926         new->se_cb_seq_nr = 1;
927         new->se_flags = cses->flags;
928         new->se_cb_prog = cses->callback_prog;
929         new->se_cb_sec = cses->cb_sec;
930         kref_init(&new->se_ref);
931         idx = hash_sessionid(&new->se_sessionid);
932         spin_lock(&nn->client_lock);
933         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
934         spin_lock(&clp->cl_lock);
935         list_add(&new->se_perclnt, &clp->cl_sessions);
936         spin_unlock(&clp->cl_lock);
937         spin_unlock(&nn->client_lock);
938
939         if (cses->flags & SESSION4_BACK_CHAN) {
940                 struct sockaddr *sa = svc_addr(rqstp);
941                 /*
942                  * This is a little silly; with sessions there's no real
943                  * use for the callback address.  Use the peer address
944                  * as a reasonable default for now, but consider fixing
945                  * the rpc client not to require an address in the
946                  * future:
947                  */
948                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
949                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
950         }
951 }
952
953 /* caller must hold client_lock */
954 static struct nfsd4_session *
955 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
956 {
957         struct nfsd4_session *elem;
958         int idx;
959         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
960
961         dump_sessionid(__func__, sessionid);
962         idx = hash_sessionid(sessionid);
963         /* Search in the appropriate list */
964         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
965                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
966                             NFS4_MAX_SESSIONID_LEN)) {
967                         return elem;
968                 }
969         }
970
971         dprintk("%s: session not found\n", __func__);
972         return NULL;
973 }
974
975 /* caller must hold client_lock */
976 static void
977 unhash_session(struct nfsd4_session *ses)
978 {
979         list_del(&ses->se_hash);
980         spin_lock(&ses->se_client->cl_lock);
981         list_del(&ses->se_perclnt);
982         spin_unlock(&ses->se_client->cl_lock);
983 }
984
985 /* must be called under the client_lock */
986 static inline void
987 renew_client_locked(struct nfs4_client *clp)
988 {
989         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
990
991         if (is_client_expired(clp)) {
992                 WARN_ON(1);
993                 printk("%s: client (clientid %08x/%08x) already expired\n",
994                         __func__,
995                         clp->cl_clientid.cl_boot,
996                         clp->cl_clientid.cl_id);
997                 return;
998         }
999
1000         dprintk("renewing client (clientid %08x/%08x)\n", 
1001                         clp->cl_clientid.cl_boot, 
1002                         clp->cl_clientid.cl_id);
1003         list_move_tail(&clp->cl_lru, &nn->client_lru);
1004         clp->cl_time = get_seconds();
1005 }
1006
1007 static inline void
1008 renew_client(struct nfs4_client *clp)
1009 {
1010         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1011
1012         spin_lock(&nn->client_lock);
1013         renew_client_locked(clp);
1014         spin_unlock(&nn->client_lock);
1015 }
1016
1017 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1018 static int
1019 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1020 {
1021         if (clid->cl_boot == nn->boot_time)
1022                 return 0;
1023         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1024                 clid->cl_boot, clid->cl_id, nn->boot_time);
1025         return 1;
1026 }
1027
1028 /* 
1029  * XXX Should we use a slab cache ?
1030  * This type of memory management is somewhat inefficient, but we use it
1031  * anyway since SETCLIENTID is not a common operation.
1032  */
1033 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1034 {
1035         struct nfs4_client *clp;
1036
1037         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1038         if (clp == NULL)
1039                 return NULL;
1040         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1041         if (clp->cl_name.data == NULL) {
1042                 kfree(clp);
1043                 return NULL;
1044         }
1045         clp->cl_name.len = name.len;
1046         return clp;
1047 }
1048
1049 static inline void
1050 free_client(struct nfs4_client *clp)
1051 {
1052         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1053
1054         lockdep_assert_held(&nn->client_lock);
1055         while (!list_empty(&clp->cl_sessions)) {
1056                 struct nfsd4_session *ses;
1057                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1058                                 se_perclnt);
1059                 list_del(&ses->se_perclnt);
1060                 nfsd4_put_session_locked(ses);
1061         }
1062         free_svc_cred(&clp->cl_cred);
1063         kfree(clp->cl_name.data);
1064         kfree(clp);
1065 }
1066
1067 void
1068 release_session_client(struct nfsd4_session *session)
1069 {
1070         struct nfs4_client *clp = session->se_client;
1071         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1072
1073         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
1074                 return;
1075         if (is_client_expired(clp)) {
1076                 free_client(clp);
1077                 session->se_client = NULL;
1078         } else
1079                 renew_client_locked(clp);
1080         spin_unlock(&nn->client_lock);
1081 }
1082
1083 /* must be called under the client_lock */
1084 static inline void
1085 unhash_client_locked(struct nfs4_client *clp)
1086 {
1087         struct nfsd4_session *ses;
1088
1089         mark_client_expired(clp);
1090         list_del(&clp->cl_lru);
1091         spin_lock(&clp->cl_lock);
1092         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1093                 list_del_init(&ses->se_hash);
1094         spin_unlock(&clp->cl_lock);
1095 }
1096
1097 static void
1098 destroy_client(struct nfs4_client *clp)
1099 {
1100         struct nfs4_openowner *oo;
1101         struct nfs4_delegation *dp;
1102         struct list_head reaplist;
1103         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1104
1105         INIT_LIST_HEAD(&reaplist);
1106         spin_lock(&recall_lock);
1107         while (!list_empty(&clp->cl_delegations)) {
1108                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1109                 list_del_init(&dp->dl_perclnt);
1110                 list_move(&dp->dl_recall_lru, &reaplist);
1111         }
1112         spin_unlock(&recall_lock);
1113         while (!list_empty(&reaplist)) {
1114                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1115                 unhash_delegation(dp);
1116         }
1117         while (!list_empty(&clp->cl_openowners)) {
1118                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1119                 release_openowner(oo);
1120         }
1121         nfsd4_shutdown_callback(clp);
1122         if (clp->cl_cb_conn.cb_xprt)
1123                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1124         list_del(&clp->cl_idhash);
1125         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1126                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1127         else
1128                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1129         spin_lock(&nn->client_lock);
1130         unhash_client_locked(clp);
1131         if (atomic_read(&clp->cl_refcount) == 0)
1132                 free_client(clp);
1133         spin_unlock(&nn->client_lock);
1134 }
1135
1136 static void expire_client(struct nfs4_client *clp)
1137 {
1138         nfsd4_client_record_remove(clp);
1139         destroy_client(clp);
1140 }
1141
1142 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1143 {
1144         memcpy(target->cl_verifier.data, source->data,
1145                         sizeof(target->cl_verifier.data));
1146 }
1147
1148 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1149 {
1150         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1151         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1152 }
1153
1154 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1155 {
1156         if (source->cr_principal) {
1157                 target->cr_principal =
1158                                 kstrdup(source->cr_principal, GFP_KERNEL);
1159                 if (target->cr_principal == NULL)
1160                         return -ENOMEM;
1161         } else
1162                 target->cr_principal = NULL;
1163         target->cr_flavor = source->cr_flavor;
1164         target->cr_uid = source->cr_uid;
1165         target->cr_gid = source->cr_gid;
1166         target->cr_group_info = source->cr_group_info;
1167         get_group_info(target->cr_group_info);
1168         return 0;
1169 }
1170
1171 static long long
1172 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1173 {
1174         long long res;
1175
1176         res = o1->len - o2->len;
1177         if (res)
1178                 return res;
1179         return (long long)memcmp(o1->data, o2->data, o1->len);
1180 }
1181
1182 static int same_name(const char *n1, const char *n2)
1183 {
1184         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1185 }
1186
1187 static int
1188 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1189 {
1190         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1191 }
1192
1193 static int
1194 same_clid(clientid_t *cl1, clientid_t *cl2)
1195 {
1196         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1197 }
1198
1199 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1200 {
1201         int i;
1202
1203         if (g1->ngroups != g2->ngroups)
1204                 return false;
1205         for (i=0; i<g1->ngroups; i++)
1206                 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1207                         return false;
1208         return true;
1209 }
1210
1211 /*
1212  * RFC 3530 language requires clid_inuse be returned when the
1213  * "principal" associated with a requests differs from that previously
1214  * used.  We use uid, gid's, and gss principal string as our best
1215  * approximation.  We also don't want to allow non-gss use of a client
1216  * established using gss: in theory cr_principal should catch that
1217  * change, but in practice cr_principal can be null even in the gss case
1218  * since gssd doesn't always pass down a principal string.
1219  */
1220 static bool is_gss_cred(struct svc_cred *cr)
1221 {
1222         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1223         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1224 }
1225
1226
1227 static bool
1228 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1229 {
1230         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1231                 || (cr1->cr_uid != cr2->cr_uid)
1232                 || (cr1->cr_gid != cr2->cr_gid)
1233                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1234                 return false;
1235         if (cr1->cr_principal == cr2->cr_principal)
1236                 return true;
1237         if (!cr1->cr_principal || !cr2->cr_principal)
1238                 return false;
1239         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1240 }
1241
1242 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1243 {
1244         static u32 current_clientid = 1;
1245
1246         clp->cl_clientid.cl_boot = nn->boot_time;
1247         clp->cl_clientid.cl_id = current_clientid++; 
1248 }
1249
1250 static void gen_confirm(struct nfs4_client *clp)
1251 {
1252         __be32 verf[2];
1253         static u32 i;
1254
1255         verf[0] = (__be32)get_seconds();
1256         verf[1] = (__be32)i++;
1257         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1258 }
1259
1260 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1261 {
1262         return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1263 }
1264
1265 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1266 {
1267         struct nfs4_stid *s;
1268
1269         s = find_stateid(cl, t);
1270         if (!s)
1271                 return NULL;
1272         if (typemask & s->sc_type)
1273                 return s;
1274         return NULL;
1275 }
1276
1277 static struct nfs4_client *create_client(struct xdr_netobj name,
1278                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1279 {
1280         struct nfs4_client *clp;
1281         struct sockaddr *sa = svc_addr(rqstp);
1282         int ret;
1283         struct net *net = SVC_NET(rqstp);
1284         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1285
1286         clp = alloc_client(name);
1287         if (clp == NULL)
1288                 return NULL;
1289
1290         INIT_LIST_HEAD(&clp->cl_sessions);
1291         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1292         if (ret) {
1293                 spin_lock(&nn->client_lock);
1294                 free_client(clp);
1295                 spin_unlock(&nn->client_lock);
1296                 return NULL;
1297         }
1298         idr_init(&clp->cl_stateids);
1299         atomic_set(&clp->cl_refcount, 0);
1300         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1301         INIT_LIST_HEAD(&clp->cl_idhash);
1302         INIT_LIST_HEAD(&clp->cl_openowners);
1303         INIT_LIST_HEAD(&clp->cl_delegations);
1304         INIT_LIST_HEAD(&clp->cl_lru);
1305         INIT_LIST_HEAD(&clp->cl_callbacks);
1306         spin_lock_init(&clp->cl_lock);
1307         nfsd4_init_callback(&clp->cl_cb_null);
1308         clp->cl_time = get_seconds();
1309         clear_bit(0, &clp->cl_cb_slot_busy);
1310         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1311         copy_verf(clp, verf);
1312         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1313         gen_confirm(clp);
1314         clp->cl_cb_session = NULL;
1315         clp->net = net;
1316         return clp;
1317 }
1318
1319 static void
1320 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1321 {
1322         struct rb_node **new = &(root->rb_node), *parent = NULL;
1323         struct nfs4_client *clp;
1324
1325         while (*new) {
1326                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1327                 parent = *new;
1328
1329                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1330                         new = &((*new)->rb_left);
1331                 else
1332                         new = &((*new)->rb_right);
1333         }
1334
1335         rb_link_node(&new_clp->cl_namenode, parent, new);
1336         rb_insert_color(&new_clp->cl_namenode, root);
1337 }
1338
1339 static struct nfs4_client *
1340 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1341 {
1342         long long cmp;
1343         struct rb_node *node = root->rb_node;
1344         struct nfs4_client *clp;
1345
1346         while (node) {
1347                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1348                 cmp = compare_blob(&clp->cl_name, name);
1349                 if (cmp > 0)
1350                         node = node->rb_left;
1351                 else if (cmp < 0)
1352                         node = node->rb_right;
1353                 else
1354                         return clp;
1355         }
1356         return NULL;
1357 }
1358
1359 static void
1360 add_to_unconfirmed(struct nfs4_client *clp)
1361 {
1362         unsigned int idhashval;
1363         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1364
1365         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1366         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1367         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1368         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1369         renew_client(clp);
1370 }
1371
1372 static void
1373 move_to_confirmed(struct nfs4_client *clp)
1374 {
1375         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1376         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1377
1378         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1379         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1380         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1381         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1382         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1383         renew_client(clp);
1384 }
1385
1386 static struct nfs4_client *
1387 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1388 {
1389         struct nfs4_client *clp;
1390         unsigned int idhashval = clientid_hashval(clid->cl_id);
1391
1392         list_for_each_entry(clp, &nn->conf_id_hashtbl[idhashval], cl_idhash) {
1393                 if (same_clid(&clp->cl_clientid, clid)) {
1394                         if ((bool)clp->cl_minorversion != sessions)
1395                                 return NULL;
1396                         renew_client(clp);
1397                         return clp;
1398                 }
1399         }
1400         return NULL;
1401 }
1402
1403 static struct nfs4_client *
1404 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1405 {
1406         struct nfs4_client *clp;
1407         unsigned int idhashval = clientid_hashval(clid->cl_id);
1408
1409         list_for_each_entry(clp, &nn->unconf_id_hashtbl[idhashval], cl_idhash) {
1410                 if (same_clid(&clp->cl_clientid, clid)) {
1411                         if ((bool)clp->cl_minorversion != sessions)
1412                                 return NULL;
1413                         return clp;
1414                 }
1415         }
1416         return NULL;
1417 }
1418
1419 static bool clp_used_exchangeid(struct nfs4_client *clp)
1420 {
1421         return clp->cl_exchange_flags != 0;
1422
1423
1424 static struct nfs4_client *
1425 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1426 {
1427         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1428 }
1429
1430 static struct nfs4_client *
1431 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1432 {
1433         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1434 }
1435
1436 static void
1437 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1438 {
1439         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1440         struct sockaddr *sa = svc_addr(rqstp);
1441         u32 scopeid = rpc_get_scope_id(sa);
1442         unsigned short expected_family;
1443
1444         /* Currently, we only support tcp and tcp6 for the callback channel */
1445         if (se->se_callback_netid_len == 3 &&
1446             !memcmp(se->se_callback_netid_val, "tcp", 3))
1447                 expected_family = AF_INET;
1448         else if (se->se_callback_netid_len == 4 &&
1449                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1450                 expected_family = AF_INET6;
1451         else
1452                 goto out_err;
1453
1454         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1455                                             se->se_callback_addr_len,
1456                                             (struct sockaddr *)&conn->cb_addr,
1457                                             sizeof(conn->cb_addr));
1458
1459         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1460                 goto out_err;
1461
1462         if (conn->cb_addr.ss_family == AF_INET6)
1463                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1464
1465         conn->cb_prog = se->se_callback_prog;
1466         conn->cb_ident = se->se_callback_ident;
1467         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1468         return;
1469 out_err:
1470         conn->cb_addr.ss_family = AF_UNSPEC;
1471         conn->cb_addrlen = 0;
1472         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1473                 "will not receive delegations\n",
1474                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1475
1476         return;
1477 }
1478
1479 /*
1480  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1481  */
1482 void
1483 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1484 {
1485         struct nfsd4_slot *slot = resp->cstate.slot;
1486         unsigned int base;
1487
1488         dprintk("--> %s slot %p\n", __func__, slot);
1489
1490         slot->sl_opcnt = resp->opcnt;
1491         slot->sl_status = resp->cstate.status;
1492
1493         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1494         if (nfsd4_not_cached(resp)) {
1495                 slot->sl_datalen = 0;
1496                 return;
1497         }
1498         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1499         base = (char *)resp->cstate.datap -
1500                                         (char *)resp->xbuf->head[0].iov_base;
1501         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1502                                     slot->sl_datalen))
1503                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1504         return;
1505 }
1506
1507 /*
1508  * Encode the replay sequence operation from the slot values.
1509  * If cachethis is FALSE encode the uncached rep error on the next
1510  * operation which sets resp->p and increments resp->opcnt for
1511  * nfs4svc_encode_compoundres.
1512  *
1513  */
1514 static __be32
1515 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1516                           struct nfsd4_compoundres *resp)
1517 {
1518         struct nfsd4_op *op;
1519         struct nfsd4_slot *slot = resp->cstate.slot;
1520
1521         /* Encode the replayed sequence operation */
1522         op = &args->ops[resp->opcnt - 1];
1523         nfsd4_encode_operation(resp, op);
1524
1525         /* Return nfserr_retry_uncached_rep in next operation. */
1526         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1527                 op = &args->ops[resp->opcnt++];
1528                 op->status = nfserr_retry_uncached_rep;
1529                 nfsd4_encode_operation(resp, op);
1530         }
1531         return op->status;
1532 }
1533
1534 /*
1535  * The sequence operation is not cached because we can use the slot and
1536  * session values.
1537  */
1538 __be32
1539 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1540                          struct nfsd4_sequence *seq)
1541 {
1542         struct nfsd4_slot *slot = resp->cstate.slot;
1543         __be32 status;
1544
1545         dprintk("--> %s slot %p\n", __func__, slot);
1546
1547         /* Either returns 0 or nfserr_retry_uncached */
1548         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1549         if (status == nfserr_retry_uncached_rep)
1550                 return status;
1551
1552         /* The sequence operation has been encoded, cstate->datap set. */
1553         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1554
1555         resp->opcnt = slot->sl_opcnt;
1556         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1557         status = slot->sl_status;
1558
1559         return status;
1560 }
1561
1562 /*
1563  * Set the exchange_id flags returned by the server.
1564  */
1565 static void
1566 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1567 {
1568         /* pNFS is not supported */
1569         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1570
1571         /* Referrals are supported, Migration is not. */
1572         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1573
1574         /* set the wire flags to return to client. */
1575         clid->flags = new->cl_exchange_flags;
1576 }
1577
1578 static bool client_has_state(struct nfs4_client *clp)
1579 {
1580         /*
1581          * Note clp->cl_openowners check isn't quite right: there's no
1582          * need to count owners without stateid's.
1583          *
1584          * Also note we should probably be using this in 4.0 case too.
1585          */
1586         return !list_empty(&clp->cl_openowners)
1587                 || !list_empty(&clp->cl_delegations)
1588                 || !list_empty(&clp->cl_sessions);
1589 }
1590
1591 __be32
1592 nfsd4_exchange_id(struct svc_rqst *rqstp,
1593                   struct nfsd4_compound_state *cstate,
1594                   struct nfsd4_exchange_id *exid)
1595 {
1596         struct nfs4_client *unconf, *conf, *new;
1597         __be32 status;
1598         char                    addr_str[INET6_ADDRSTRLEN];
1599         nfs4_verifier           verf = exid->verifier;
1600         struct sockaddr         *sa = svc_addr(rqstp);
1601         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1602         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1603
1604         rpc_ntop(sa, addr_str, sizeof(addr_str));
1605         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1606                 "ip_addr=%s flags %x, spa_how %d\n",
1607                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1608                 addr_str, exid->flags, exid->spa_how);
1609
1610         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1611                 return nfserr_inval;
1612
1613         /* Currently only support SP4_NONE */
1614         switch (exid->spa_how) {
1615         case SP4_NONE:
1616                 break;
1617         default:                                /* checked by xdr code */
1618                 WARN_ON_ONCE(1);
1619         case SP4_SSV:
1620         case SP4_MACH_CRED:
1621                 return nfserr_serverfault;      /* no excuse :-/ */
1622         }
1623
1624         /* Cases below refer to rfc 5661 section 18.35.4: */
1625         nfs4_lock_state();
1626         conf = find_confirmed_client_by_name(&exid->clname, nn);
1627         if (conf) {
1628                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1629                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1630
1631                 if (update) {
1632                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1633                                 status = nfserr_inval;
1634                                 goto out;
1635                         }
1636                         if (!creds_match) { /* case 9 */
1637                                 status = nfserr_perm;
1638                                 goto out;
1639                         }
1640                         if (!verfs_match) { /* case 8 */
1641                                 status = nfserr_not_same;
1642                                 goto out;
1643                         }
1644                         /* case 6 */
1645                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1646                         new = conf;
1647                         goto out_copy;
1648                 }
1649                 if (!creds_match) { /* case 3 */
1650                         if (client_has_state(conf)) {
1651                                 status = nfserr_clid_inuse;
1652                                 goto out;
1653                         }
1654                         expire_client(conf);
1655                         goto out_new;
1656                 }
1657                 if (verfs_match) { /* case 2 */
1658                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1659                         new = conf;
1660                         goto out_copy;
1661                 }
1662                 /* case 5, client reboot */
1663                 goto out_new;
1664         }
1665
1666         if (update) { /* case 7 */
1667                 status = nfserr_noent;
1668                 goto out;
1669         }
1670
1671         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1672         if (unconf) /* case 4, possible retry or client restart */
1673                 expire_client(unconf);
1674
1675         /* case 1 (normal case) */
1676 out_new:
1677         new = create_client(exid->clname, rqstp, &verf);
1678         if (new == NULL) {
1679                 status = nfserr_jukebox;
1680                 goto out;
1681         }
1682         new->cl_minorversion = 1;
1683
1684         gen_clid(new, nn);
1685         add_to_unconfirmed(new);
1686 out_copy:
1687         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1688         exid->clientid.cl_id = new->cl_clientid.cl_id;
1689
1690         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1691         nfsd4_set_ex_flags(new, exid);
1692
1693         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1694                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1695         status = nfs_ok;
1696
1697 out:
1698         nfs4_unlock_state();
1699         return status;
1700 }
1701
1702 static __be32
1703 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1704 {
1705         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1706                 slot_seqid);
1707
1708         /* The slot is in use, and no response has been sent. */
1709         if (slot_inuse) {
1710                 if (seqid == slot_seqid)
1711                         return nfserr_jukebox;
1712                 else
1713                         return nfserr_seq_misordered;
1714         }
1715         /* Note unsigned 32-bit arithmetic handles wraparound: */
1716         if (likely(seqid == slot_seqid + 1))
1717                 return nfs_ok;
1718         if (seqid == slot_seqid)
1719                 return nfserr_replay_cache;
1720         return nfserr_seq_misordered;
1721 }
1722
1723 /*
1724  * Cache the create session result into the create session single DRC
1725  * slot cache by saving the xdr structure. sl_seqid has been set.
1726  * Do this for solo or embedded create session operations.
1727  */
1728 static void
1729 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1730                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1731 {
1732         slot->sl_status = nfserr;
1733         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1734 }
1735
1736 static __be32
1737 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1738                             struct nfsd4_clid_slot *slot)
1739 {
1740         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1741         return slot->sl_status;
1742 }
1743
1744 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1745                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1746                         1 +     /* MIN tag is length with zero, only length */ \
1747                         3 +     /* version, opcount, opcode */ \
1748                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1749                                 /* seqid, slotID, slotID, cache */ \
1750                         4 ) * sizeof(__be32))
1751
1752 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1753                         2 +     /* verifier: AUTH_NULL, length 0 */\
1754                         1 +     /* status */ \
1755                         1 +     /* MIN tag is length with zero, only length */ \
1756                         3 +     /* opcount, opcode, opstatus*/ \
1757                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1758                                 /* seqid, slotID, slotID, slotID, status */ \
1759                         5 ) * sizeof(__be32))
1760
1761 static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1762 {
1763         return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1764                 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1765 }
1766
1767 __be32
1768 nfsd4_create_session(struct svc_rqst *rqstp,
1769                      struct nfsd4_compound_state *cstate,
1770                      struct nfsd4_create_session *cr_ses)
1771 {
1772         struct sockaddr *sa = svc_addr(rqstp);
1773         struct nfs4_client *conf, *unconf;
1774         struct nfsd4_session *new;
1775         struct nfsd4_conn *conn;
1776         struct nfsd4_clid_slot *cs_slot = NULL;
1777         __be32 status = 0;
1778         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1779
1780         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1781                 return nfserr_inval;
1782         if (check_forechannel_attrs(cr_ses->fore_channel))
1783                 return nfserr_toosmall;
1784         new = alloc_session(&cr_ses->fore_channel);
1785         if (!new)
1786                 return nfserr_jukebox;
1787         status = nfserr_jukebox;
1788         conn = alloc_conn_from_crses(rqstp, cr_ses);
1789         if (!conn)
1790                 goto out_free_session;
1791
1792         nfs4_lock_state();
1793         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1794         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1795
1796         if (conf) {
1797                 cs_slot = &conf->cl_cs_slot;
1798                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1799                 if (status == nfserr_replay_cache) {
1800                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1801                         goto out_free_conn;
1802                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1803                         status = nfserr_seq_misordered;
1804                         goto out_free_conn;
1805                 }
1806         } else if (unconf) {
1807                 struct nfs4_client *old;
1808                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1809                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1810                         status = nfserr_clid_inuse;
1811                         goto out_free_conn;
1812                 }
1813                 cs_slot = &unconf->cl_cs_slot;
1814                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1815                 if (status) {
1816                         /* an unconfirmed replay returns misordered */
1817                         status = nfserr_seq_misordered;
1818                         goto out_free_conn;
1819                 }
1820                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1821                 if (old)
1822                         expire_client(old);
1823                 move_to_confirmed(unconf);
1824                 conf = unconf;
1825         } else {
1826                 status = nfserr_stale_clientid;
1827                 goto out_free_conn;
1828         }
1829         status = nfs_ok;
1830         /*
1831          * We do not support RDMA or persistent sessions
1832          */
1833         cr_ses->flags &= ~SESSION4_PERSIST;
1834         cr_ses->flags &= ~SESSION4_RDMA;
1835
1836         init_session(rqstp, new, conf, cr_ses);
1837         nfsd4_init_conn(rqstp, conn, new);
1838
1839         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1840                NFS4_MAX_SESSIONID_LEN);
1841         memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1842                 sizeof(struct nfsd4_channel_attrs));
1843         cs_slot->sl_seqid++;
1844         cr_ses->seqid = cs_slot->sl_seqid;
1845
1846         /* cache solo and embedded create sessions under the state lock */
1847         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1848 out:
1849         nfs4_unlock_state();
1850         dprintk("%s returns %d\n", __func__, ntohl(status));
1851         return status;
1852 out_free_conn:
1853         free_conn(conn);
1854 out_free_session:
1855         __free_session(new);
1856         goto out;
1857 }
1858
1859 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1860 {
1861         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1862         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1863
1864         return argp->opcnt == resp->opcnt;
1865 }
1866
1867 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1868 {
1869         switch (*dir) {
1870         case NFS4_CDFC4_FORE:
1871         case NFS4_CDFC4_BACK:
1872                 return nfs_ok;
1873         case NFS4_CDFC4_FORE_OR_BOTH:
1874         case NFS4_CDFC4_BACK_OR_BOTH:
1875                 *dir = NFS4_CDFC4_BOTH;
1876                 return nfs_ok;
1877         };
1878         return nfserr_inval;
1879 }
1880
1881 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
1882 {
1883         struct nfsd4_session *session = cstate->session;
1884         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1885
1886         spin_lock(&nn->client_lock);
1887         session->se_cb_prog = bc->bc_cb_program;
1888         session->se_cb_sec = bc->bc_cb_sec;
1889         spin_unlock(&nn->client_lock);
1890
1891         nfsd4_probe_callback(session->se_client);
1892
1893         return nfs_ok;
1894 }
1895
1896 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1897                      struct nfsd4_compound_state *cstate,
1898                      struct nfsd4_bind_conn_to_session *bcts)
1899 {
1900         __be32 status;
1901         struct nfsd4_conn *conn;
1902         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1903
1904         if (!nfsd4_last_compound_op(rqstp))
1905                 return nfserr_not_only_op;
1906         spin_lock(&nn->client_lock);
1907         cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
1908         /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1909          * client_lock iself: */
1910         if (cstate->session) {
1911                 nfsd4_get_session(cstate->session);
1912                 atomic_inc(&cstate->session->se_client->cl_refcount);
1913         }
1914         spin_unlock(&nn->client_lock);
1915         if (!cstate->session)
1916                 return nfserr_badsession;
1917
1918         status = nfsd4_map_bcts_dir(&bcts->dir);
1919         if (status)
1920                 return status;
1921         conn = alloc_conn(rqstp, bcts->dir);
1922         if (!conn)
1923                 return nfserr_jukebox;
1924         nfsd4_init_conn(rqstp, conn, cstate->session);
1925         return nfs_ok;
1926 }
1927
1928 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1929 {
1930         if (!session)
1931                 return 0;
1932         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1933 }
1934
1935 __be32
1936 nfsd4_destroy_session(struct svc_rqst *r,
1937                       struct nfsd4_compound_state *cstate,
1938                       struct nfsd4_destroy_session *sessionid)
1939 {
1940         struct nfsd4_session *ses;
1941         __be32 status = nfserr_badsession;
1942         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
1943
1944         /* Notes:
1945          * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1946          * - Should we return nfserr_back_chan_busy if waiting for
1947          *   callbacks on to-be-destroyed session?
1948          * - Do we need to clear any callback info from previous session?
1949          */
1950
1951         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1952                 if (!nfsd4_last_compound_op(r))
1953                         return nfserr_not_only_op;
1954         }
1955         dump_sessionid(__func__, &sessionid->sessionid);
1956         spin_lock(&nn->client_lock);
1957         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
1958         if (!ses) {
1959                 spin_unlock(&nn->client_lock);
1960                 goto out;
1961         }
1962
1963         unhash_session(ses);
1964         spin_unlock(&nn->client_lock);
1965
1966         nfs4_lock_state();
1967         nfsd4_probe_callback_sync(ses->se_client);
1968         nfs4_unlock_state();
1969
1970         spin_lock(&nn->client_lock);
1971         nfsd4_del_conns(ses);
1972         nfsd4_put_session_locked(ses);
1973         spin_unlock(&nn->client_lock);
1974         status = nfs_ok;
1975 out:
1976         dprintk("%s returns %d\n", __func__, ntohl(status));
1977         return status;
1978 }
1979
1980 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1981 {
1982         struct nfsd4_conn *c;
1983
1984         list_for_each_entry(c, &s->se_conns, cn_persession) {
1985                 if (c->cn_xprt == xpt) {
1986                         return c;
1987                 }
1988         }
1989         return NULL;
1990 }
1991
1992 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1993 {
1994         struct nfs4_client *clp = ses->se_client;
1995         struct nfsd4_conn *c;
1996         int ret;
1997
1998         spin_lock(&clp->cl_lock);
1999         c = __nfsd4_find_conn(new->cn_xprt, ses);
2000         if (c) {
2001                 spin_unlock(&clp->cl_lock);
2002                 free_conn(new);
2003                 return;
2004         }
2005         __nfsd4_hash_conn(new, ses);
2006         spin_unlock(&clp->cl_lock);
2007         ret = nfsd4_register_conn(new);
2008         if (ret)
2009                 /* oops; xprt is already down: */
2010                 nfsd4_conn_lost(&new->cn_xpt_user);
2011         return;
2012 }
2013
2014 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2015 {
2016         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2017
2018         return args->opcnt > session->se_fchannel.maxops;
2019 }
2020
2021 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2022                                   struct nfsd4_session *session)
2023 {
2024         struct xdr_buf *xb = &rqstp->rq_arg;
2025
2026         return xb->len > session->se_fchannel.maxreq_sz;
2027 }
2028
2029 __be32
2030 nfsd4_sequence(struct svc_rqst *rqstp,
2031                struct nfsd4_compound_state *cstate,
2032                struct nfsd4_sequence *seq)
2033 {
2034         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2035         struct nfsd4_session *session;
2036         struct nfsd4_slot *slot;
2037         struct nfsd4_conn *conn;
2038         __be32 status;
2039         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2040
2041         if (resp->opcnt != 1)
2042                 return nfserr_sequence_pos;
2043
2044         /*
2045          * Will be either used or freed by nfsd4_sequence_check_conn
2046          * below.
2047          */
2048         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2049         if (!conn)
2050                 return nfserr_jukebox;
2051
2052         spin_lock(&nn->client_lock);
2053         status = nfserr_badsession;
2054         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2055         if (!session)
2056                 goto out;
2057
2058         status = nfserr_too_many_ops;
2059         if (nfsd4_session_too_many_ops(rqstp, session))
2060                 goto out;
2061
2062         status = nfserr_req_too_big;
2063         if (nfsd4_request_too_big(rqstp, session))
2064                 goto out;
2065
2066         status = nfserr_badslot;
2067         if (seq->slotid >= session->se_fchannel.maxreqs)
2068                 goto out;
2069
2070         slot = session->se_slots[seq->slotid];
2071         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2072
2073         /* We do not negotiate the number of slots yet, so set the
2074          * maxslots to the session maxreqs which is used to encode
2075          * sr_highest_slotid and the sr_target_slot id to maxslots */
2076         seq->maxslots = session->se_fchannel.maxreqs;
2077
2078         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2079                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2080         if (status == nfserr_replay_cache) {
2081                 status = nfserr_seq_misordered;
2082                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2083                         goto out;
2084                 cstate->slot = slot;
2085                 cstate->session = session;
2086                 /* Return the cached reply status and set cstate->status
2087                  * for nfsd4_proc_compound processing */
2088                 status = nfsd4_replay_cache_entry(resp, seq);
2089                 cstate->status = nfserr_replay_cache;
2090                 goto out;
2091         }
2092         if (status)
2093                 goto out;
2094
2095         nfsd4_sequence_check_conn(conn, session);
2096         conn = NULL;
2097
2098         /* Success! bump slot seqid */
2099         slot->sl_seqid = seq->seqid;
2100         slot->sl_flags |= NFSD4_SLOT_INUSE;
2101         if (seq->cachethis)
2102                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2103         else
2104                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2105
2106         cstate->slot = slot;
2107         cstate->session = session;
2108
2109 out:
2110         /* Hold a session reference until done processing the compound. */
2111         if (cstate->session) {
2112                 struct nfs4_client *clp = session->se_client;
2113
2114                 nfsd4_get_session(cstate->session);
2115                 atomic_inc(&clp->cl_refcount);
2116                 switch (clp->cl_cb_state) {
2117                 case NFSD4_CB_DOWN:
2118                         seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2119                         break;
2120                 case NFSD4_CB_FAULT:
2121                         seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2122                         break;
2123                 default:
2124                         seq->status_flags = 0;
2125                 }
2126         }
2127         kfree(conn);
2128         spin_unlock(&nn->client_lock);
2129         dprintk("%s: return %d\n", __func__, ntohl(status));
2130         return status;
2131 }
2132
2133 __be32
2134 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2135 {
2136         struct nfs4_client *conf, *unconf, *clp;
2137         __be32 status = 0;
2138         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2139
2140         nfs4_lock_state();
2141         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2142         conf = find_confirmed_client(&dc->clientid, true, nn);
2143
2144         if (conf) {
2145                 clp = conf;
2146
2147                 if (!is_client_expired(conf) && client_has_state(conf)) {
2148                         status = nfserr_clientid_busy;
2149                         goto out;
2150                 }
2151
2152                 /* rfc5661 18.50.3 */
2153                 if (cstate->session && conf == cstate->session->se_client) {
2154                         status = nfserr_clientid_busy;
2155                         goto out;
2156                 }
2157         } else if (unconf)
2158                 clp = unconf;
2159         else {
2160                 status = nfserr_stale_clientid;
2161                 goto out;
2162         }
2163
2164         expire_client(clp);
2165 out:
2166         nfs4_unlock_state();
2167         dprintk("%s return %d\n", __func__, ntohl(status));
2168         return status;
2169 }
2170
2171 __be32
2172 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2173 {
2174         __be32 status = 0;
2175
2176         if (rc->rca_one_fs) {
2177                 if (!cstate->current_fh.fh_dentry)
2178                         return nfserr_nofilehandle;
2179                 /*
2180                  * We don't take advantage of the rca_one_fs case.
2181                  * That's OK, it's optional, we can safely ignore it.
2182                  */
2183                  return nfs_ok;
2184         }
2185
2186         nfs4_lock_state();
2187         status = nfserr_complete_already;
2188         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2189                              &cstate->session->se_client->cl_flags))
2190                 goto out;
2191
2192         status = nfserr_stale_clientid;
2193         if (is_client_expired(cstate->session->se_client))
2194                 /*
2195                  * The following error isn't really legal.
2196                  * But we only get here if the client just explicitly
2197                  * destroyed the client.  Surely it no longer cares what
2198                  * error it gets back on an operation for the dead
2199                  * client.
2200                  */
2201                 goto out;
2202
2203         status = nfs_ok;
2204         nfsd4_client_record_create(cstate->session->se_client);
2205 out:
2206         nfs4_unlock_state();
2207         return status;
2208 }
2209
2210 __be32
2211 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2212                   struct nfsd4_setclientid *setclid)
2213 {
2214         struct xdr_netobj       clname = setclid->se_name;
2215         nfs4_verifier           clverifier = setclid->se_verf;
2216         struct nfs4_client      *conf, *unconf, *new;
2217         __be32                  status;
2218         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2219
2220         /* Cases below refer to rfc 3530 section 14.2.33: */
2221         nfs4_lock_state();
2222         conf = find_confirmed_client_by_name(&clname, nn);
2223         if (conf) {
2224                 /* case 0: */
2225                 status = nfserr_clid_inuse;
2226                 if (clp_used_exchangeid(conf))
2227                         goto out;
2228                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2229                         char addr_str[INET6_ADDRSTRLEN];
2230                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2231                                  sizeof(addr_str));
2232                         dprintk("NFSD: setclientid: string in use by client "
2233                                 "at %s\n", addr_str);
2234                         goto out;
2235                 }
2236         }
2237         unconf = find_unconfirmed_client_by_name(&clname, nn);
2238         if (unconf)
2239                 expire_client(unconf);
2240         status = nfserr_jukebox;
2241         new = create_client(clname, rqstp, &clverifier);
2242         if (new == NULL)
2243                 goto out;
2244         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2245                 /* case 1: probable callback update */
2246                 copy_clid(new, conf);
2247         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2248                 gen_clid(new, nn);
2249         new->cl_minorversion = 0;
2250         gen_callback(new, setclid, rqstp);
2251         add_to_unconfirmed(new);
2252         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2253         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2254         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2255         status = nfs_ok;
2256 out:
2257         nfs4_unlock_state();
2258         return status;
2259 }
2260
2261
2262 __be32
2263 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2264                          struct nfsd4_compound_state *cstate,
2265                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2266 {
2267         struct nfs4_client *conf, *unconf;
2268         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
2269         clientid_t * clid = &setclientid_confirm->sc_clientid;
2270         __be32 status;
2271         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2272
2273         if (STALE_CLIENTID(clid, nn))
2274                 return nfserr_stale_clientid;
2275         nfs4_lock_state();
2276
2277         conf = find_confirmed_client(clid, false, nn);
2278         unconf = find_unconfirmed_client(clid, false, nn);
2279         /*
2280          * We try hard to give out unique clientid's, so if we get an
2281          * attempt to confirm the same clientid with a different cred,
2282          * there's a bug somewhere.  Let's charitably assume it's our
2283          * bug.
2284          */
2285         status = nfserr_serverfault;
2286         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2287                 goto out;
2288         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2289                 goto out;
2290         /* cases below refer to rfc 3530 section 14.2.34: */
2291         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2292                 if (conf && !unconf) /* case 2: probable retransmit */
2293                         status = nfs_ok;
2294                 else /* case 4: client hasn't noticed we rebooted yet? */
2295                         status = nfserr_stale_clientid;
2296                 goto out;
2297         }
2298         status = nfs_ok;
2299         if (conf) { /* case 1: callback update */
2300                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2301                 nfsd4_probe_callback(conf);
2302                 expire_client(unconf);
2303         } else { /* case 3: normal case; new or rebooted client */
2304                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2305                 if (conf)
2306                         expire_client(conf);
2307                 move_to_confirmed(unconf);
2308                 nfsd4_probe_callback(unconf);
2309         }
2310 out:
2311         nfs4_unlock_state();
2312         return status;
2313 }
2314
2315 static struct nfs4_file *nfsd4_alloc_file(void)
2316 {
2317         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2318 }
2319
2320 /* OPEN Share state helper functions */
2321 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2322 {
2323         unsigned int hashval = file_hashval(ino);
2324
2325         atomic_set(&fp->fi_ref, 1);
2326         INIT_LIST_HEAD(&fp->fi_hash);
2327         INIT_LIST_HEAD(&fp->fi_stateids);
2328         INIT_LIST_HEAD(&fp->fi_delegations);
2329         fp->fi_inode = igrab(ino);
2330         fp->fi_had_conflict = false;
2331         fp->fi_lease = NULL;
2332         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2333         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2334         spin_lock(&recall_lock);
2335         list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2336         spin_unlock(&recall_lock);
2337 }
2338
2339 static void
2340 nfsd4_free_slab(struct kmem_cache **slab)
2341 {
2342         if (*slab == NULL)
2343                 return;
2344         kmem_cache_destroy(*slab);
2345         *slab = NULL;
2346 }
2347
2348 void
2349 nfsd4_free_slabs(void)
2350 {
2351         nfsd4_free_slab(&openowner_slab);
2352         nfsd4_free_slab(&lockowner_slab);
2353         nfsd4_free_slab(&file_slab);
2354         nfsd4_free_slab(&stateid_slab);
2355         nfsd4_free_slab(&deleg_slab);
2356 }
2357
2358 int
2359 nfsd4_init_slabs(void)
2360 {
2361         openowner_slab = kmem_cache_create("nfsd4_openowners",
2362                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2363         if (openowner_slab == NULL)
2364                 goto out_nomem;
2365         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2366                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2367         if (lockowner_slab == NULL)
2368                 goto out_nomem;
2369         file_slab = kmem_cache_create("nfsd4_files",
2370                         sizeof(struct nfs4_file), 0, 0, NULL);
2371         if (file_slab == NULL)
2372                 goto out_nomem;
2373         stateid_slab = kmem_cache_create("nfsd4_stateids",
2374                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2375         if (stateid_slab == NULL)
2376                 goto out_nomem;
2377         deleg_slab = kmem_cache_create("nfsd4_delegations",
2378                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2379         if (deleg_slab == NULL)
2380                 goto out_nomem;
2381         return 0;
2382 out_nomem:
2383         nfsd4_free_slabs();
2384         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2385         return -ENOMEM;
2386 }
2387
2388 void nfs4_free_openowner(struct nfs4_openowner *oo)
2389 {
2390         kfree(oo->oo_owner.so_owner.data);
2391         kmem_cache_free(openowner_slab, oo);
2392 }
2393
2394 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2395 {
2396         kfree(lo->lo_owner.so_owner.data);
2397         kmem_cache_free(lockowner_slab, lo);
2398 }
2399
2400 static void init_nfs4_replay(struct nfs4_replay *rp)
2401 {
2402         rp->rp_status = nfserr_serverfault;
2403         rp->rp_buflen = 0;
2404         rp->rp_buf = rp->rp_ibuf;
2405 }
2406
2407 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2408 {
2409         struct nfs4_stateowner *sop;
2410
2411         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2412         if (!sop)
2413                 return NULL;
2414
2415         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2416         if (!sop->so_owner.data) {
2417                 kmem_cache_free(slab, sop);
2418                 return NULL;
2419         }
2420         sop->so_owner.len = owner->len;
2421
2422         INIT_LIST_HEAD(&sop->so_stateids);
2423         sop->so_client = clp;
2424         init_nfs4_replay(&sop->so_replay);
2425         return sop;
2426 }
2427
2428 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2429 {
2430         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2431
2432         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2433         list_add(&oo->oo_perclient, &clp->cl_openowners);
2434 }
2435
2436 static struct nfs4_openowner *
2437 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2438         struct nfs4_openowner *oo;
2439
2440         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2441         if (!oo)
2442                 return NULL;
2443         oo->oo_owner.so_is_open_owner = 1;
2444         oo->oo_owner.so_seqid = open->op_seqid;
2445         oo->oo_flags = NFS4_OO_NEW;
2446         oo->oo_time = 0;
2447         oo->oo_last_closed_stid = NULL;
2448         INIT_LIST_HEAD(&oo->oo_close_lru);
2449         hash_openowner(oo, clp, strhashval);
2450         return oo;
2451 }
2452
2453 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2454         struct nfs4_openowner *oo = open->op_openowner;
2455         struct nfs4_client *clp = oo->oo_owner.so_client;
2456
2457         init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2458         INIT_LIST_HEAD(&stp->st_lockowners);
2459         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2460         list_add(&stp->st_perfile, &fp->fi_stateids);
2461         stp->st_stateowner = &oo->oo_owner;
2462         get_nfs4_file(fp);
2463         stp->st_file = fp;
2464         stp->st_access_bmap = 0;
2465         stp->st_deny_bmap = 0;
2466         set_access(open->op_share_access, stp);
2467         set_deny(open->op_share_deny, stp);
2468         stp->st_openstp = NULL;
2469 }
2470
2471 static void
2472 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2473 {
2474         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2475
2476         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2477
2478         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2479         oo->oo_time = get_seconds();
2480 }
2481
2482 static int
2483 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2484                                                         clientid_t *clid)
2485 {
2486         return (sop->so_owner.len == owner->len) &&
2487                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2488                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2489 }
2490
2491 static struct nfs4_openowner *
2492 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2493                         bool sessions, struct nfsd_net *nn)
2494 {
2495         struct nfs4_stateowner *so;
2496         struct nfs4_openowner *oo;
2497         struct nfs4_client *clp;
2498
2499         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2500                 if (!so->so_is_open_owner)
2501                         continue;
2502                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2503                         oo = openowner(so);
2504                         clp = oo->oo_owner.so_client;
2505                         if ((bool)clp->cl_minorversion != sessions)
2506                                 return NULL;
2507                         renew_client(oo->oo_owner.so_client);
2508                         return oo;
2509                 }
2510         }
2511         return NULL;
2512 }
2513
2514 /* search file_hashtbl[] for file */
2515 static struct nfs4_file *
2516 find_file(struct inode *ino)
2517 {
2518         unsigned int hashval = file_hashval(ino);
2519         struct nfs4_file *fp;
2520
2521         spin_lock(&recall_lock);
2522         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2523                 if (fp->fi_inode == ino) {
2524                         get_nfs4_file(fp);
2525                         spin_unlock(&recall_lock);
2526                         return fp;
2527                 }
2528         }
2529         spin_unlock(&recall_lock);
2530         return NULL;
2531 }
2532
2533 /*
2534  * Called to check deny when READ with all zero stateid or
2535  * WRITE with all zero or all one stateid
2536  */
2537 static __be32
2538 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2539 {
2540         struct inode *ino = current_fh->fh_dentry->d_inode;
2541         struct nfs4_file *fp;
2542         struct nfs4_ol_stateid *stp;
2543         __be32 ret;
2544
2545         dprintk("NFSD: nfs4_share_conflict\n");
2546
2547         fp = find_file(ino);
2548         if (!fp)
2549                 return nfs_ok;
2550         ret = nfserr_locked;
2551         /* Search for conflicting share reservations */
2552         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2553                 if (test_deny(deny_type, stp) ||
2554                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2555                         goto out;
2556         }
2557         ret = nfs_ok;
2558 out:
2559         put_nfs4_file(fp);
2560         return ret;
2561 }
2562
2563 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2564 {
2565         /* We're assuming the state code never drops its reference
2566          * without first removing the lease.  Since we're in this lease
2567          * callback (and since the lease code is serialized by the kernel
2568          * lock) we know the server hasn't removed the lease yet, we know
2569          * it's safe to take a reference: */
2570         atomic_inc(&dp->dl_count);
2571
2572         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2573
2574         /* only place dl_time is set. protected by lock_flocks*/
2575         dp->dl_time = get_seconds();
2576
2577         nfsd4_cb_recall(dp);
2578 }
2579
2580 /* Called from break_lease() with lock_flocks() held. */
2581 static void nfsd_break_deleg_cb(struct file_lock *fl)
2582 {
2583         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2584         struct nfs4_delegation *dp;
2585
2586         if (!fp) {
2587                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2588                 return;
2589         }
2590         if (fp->fi_had_conflict) {
2591                 WARN(1, "duplicate break on %p\n", fp);
2592                 return;
2593         }
2594         /*
2595          * We don't want the locks code to timeout the lease for us;
2596          * we'll remove it ourself if a delegation isn't returned
2597          * in time:
2598          */
2599         fl->fl_break_time = 0;
2600
2601         spin_lock(&recall_lock);
2602         fp->fi_had_conflict = true;
2603         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2604                 nfsd_break_one_deleg(dp);
2605         spin_unlock(&recall_lock);
2606 }
2607
2608 static
2609 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2610 {
2611         if (arg & F_UNLCK)
2612                 return lease_modify(onlist, arg);
2613         else
2614                 return -EAGAIN;
2615 }
2616
2617 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2618         .lm_break = nfsd_break_deleg_cb,
2619         .lm_change = nfsd_change_deleg_cb,
2620 };
2621
2622 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2623 {
2624         if (nfsd4_has_session(cstate))
2625                 return nfs_ok;
2626         if (seqid == so->so_seqid - 1)
2627                 return nfserr_replay_me;
2628         if (seqid == so->so_seqid)
2629                 return nfs_ok;
2630         return nfserr_bad_seqid;
2631 }
2632
2633 __be32
2634 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2635                     struct nfsd4_open *open, struct nfsd_net *nn)
2636 {
2637         clientid_t *clientid = &open->op_clientid;
2638         struct nfs4_client *clp = NULL;
2639         unsigned int strhashval;
2640         struct nfs4_openowner *oo = NULL;
2641         __be32 status;
2642
2643         if (STALE_CLIENTID(&open->op_clientid, nn))
2644                 return nfserr_stale_clientid;
2645         /*
2646          * In case we need it later, after we've already created the
2647          * file and don't want to risk a further failure:
2648          */
2649         open->op_file = nfsd4_alloc_file();
2650         if (open->op_file == NULL)
2651                 return nfserr_jukebox;
2652
2653         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2654         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2655         open->op_openowner = oo;
2656         if (!oo) {
2657                 clp = find_confirmed_client(clientid, cstate->minorversion,
2658                                             nn);
2659                 if (clp == NULL)
2660                         return nfserr_expired;
2661                 goto new_owner;
2662         }
2663         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2664                 /* Replace unconfirmed owners without checking for replay. */
2665                 clp = oo->oo_owner.so_client;
2666                 release_openowner(oo);
2667                 open->op_openowner = NULL;
2668                 goto new_owner;
2669         }
2670         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2671         if (status)
2672                 return status;
2673         clp = oo->oo_owner.so_client;
2674         goto alloc_stateid;
2675 new_owner:
2676         oo = alloc_init_open_stateowner(strhashval, clp, open);
2677         if (oo == NULL)
2678                 return nfserr_jukebox;
2679         open->op_openowner = oo;
2680 alloc_stateid:
2681         open->op_stp = nfs4_alloc_stateid(clp);
2682         if (!open->op_stp)
2683                 return nfserr_jukebox;
2684         return nfs_ok;
2685 }
2686
2687 static inline __be32
2688 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2689 {
2690         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2691                 return nfserr_openmode;
2692         else
2693                 return nfs_ok;
2694 }
2695
2696 static int share_access_to_flags(u32 share_access)
2697 {
2698         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2699 }
2700
2701 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2702 {
2703         struct nfs4_stid *ret;
2704
2705         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2706         if (!ret)
2707                 return NULL;
2708         return delegstateid(ret);
2709 }
2710
2711 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2712 {
2713         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2714                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2715 }
2716
2717 static __be32
2718 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2719                 struct nfs4_delegation **dp)
2720 {
2721         int flags;
2722         __be32 status = nfserr_bad_stateid;
2723
2724         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2725         if (*dp == NULL)
2726                 goto out;
2727         flags = share_access_to_flags(open->op_share_access);
2728         status = nfs4_check_delegmode(*dp, flags);
2729         if (status)
2730                 *dp = NULL;
2731 out:
2732         if (!nfsd4_is_deleg_cur(open))
2733                 return nfs_ok;
2734         if (status)
2735                 return status;
2736         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2737         return nfs_ok;
2738 }
2739
2740 static __be32
2741 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2742 {
2743         struct nfs4_ol_stateid *local;
2744         struct nfs4_openowner *oo = open->op_openowner;
2745
2746         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2747                 /* ignore lock owners */
2748                 if (local->st_stateowner->so_is_open_owner == 0)
2749                         continue;
2750                 /* remember if we have seen this open owner */
2751                 if (local->st_stateowner == &oo->oo_owner)
2752                         *stpp = local;
2753                 /* check for conflicting share reservations */
2754                 if (!test_share(local, open))
2755                         return nfserr_share_denied;
2756         }
2757         return nfs_ok;
2758 }
2759
2760 static inline int nfs4_access_to_access(u32 nfs4_access)
2761 {
2762         int flags = 0;
2763
2764         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2765                 flags |= NFSD_MAY_READ;
2766         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2767                 flags |= NFSD_MAY_WRITE;
2768         return flags;
2769 }
2770
2771 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2772                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2773 {
2774         __be32 status;
2775         int oflag = nfs4_access_to_omode(open->op_share_access);
2776         int access = nfs4_access_to_access(open->op_share_access);
2777
2778         if (!fp->fi_fds[oflag]) {
2779                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2780                         &fp->fi_fds[oflag]);
2781                 if (status)
2782                         return status;
2783         }
2784         nfs4_file_get_access(fp, oflag);
2785
2786         return nfs_ok;
2787 }
2788
2789 static inline __be32
2790 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2791                 struct nfsd4_open *open)
2792 {
2793         struct iattr iattr = {
2794                 .ia_valid = ATTR_SIZE,
2795                 .ia_size = 0,
2796         };
2797         if (!open->op_truncate)
2798                 return 0;
2799         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2800                 return nfserr_inval;
2801         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2802 }
2803
2804 static __be32
2805 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)
2806 {
2807         u32 op_share_access = open->op_share_access;
2808         bool new_access;
2809         __be32 status;
2810
2811         new_access = !test_access(op_share_access, stp);
2812         if (new_access) {
2813                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2814                 if (status)
2815                         return status;
2816         }
2817         status = nfsd4_truncate(rqstp, cur_fh, open);
2818         if (status) {
2819                 if (new_access) {
2820                         int oflag = nfs4_access_to_omode(op_share_access);
2821                         nfs4_file_put_access(fp, oflag);
2822                 }
2823                 return status;
2824         }
2825         /* remember the open */
2826         set_access(op_share_access, stp);
2827         set_deny(open->op_share_deny, stp);
2828
2829         return nfs_ok;
2830 }
2831
2832
2833 static void
2834 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2835 {
2836         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2837 }
2838
2839 /* Should we give out recallable state?: */
2840 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2841 {
2842         if (clp->cl_cb_state == NFSD4_CB_UP)
2843                 return true;
2844         /*
2845          * In the sessions case, since we don't have to establish a
2846          * separate connection for callbacks, we assume it's OK
2847          * until we hear otherwise:
2848          */
2849         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2850 }
2851
2852 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2853 {
2854         struct file_lock *fl;
2855
2856         fl = locks_alloc_lock();
2857         if (!fl)
2858                 return NULL;
2859         locks_init_lock(fl);
2860         fl->fl_lmops = &nfsd_lease_mng_ops;
2861         fl->fl_flags = FL_LEASE;
2862         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2863         fl->fl_end = OFFSET_MAX;
2864         fl->fl_owner = (fl_owner_t)(dp->dl_file);
2865         fl->fl_pid = current->tgid;
2866         return fl;
2867 }
2868
2869 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2870 {
2871         struct nfs4_file *fp = dp->dl_file;
2872         struct file_lock *fl;
2873         int status;
2874
2875         fl = nfs4_alloc_init_lease(dp, flag);
2876         if (!fl)
2877                 return -ENOMEM;
2878         fl->fl_file = find_readable_file(fp);
2879         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2880         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2881         if (status) {
2882                 list_del_init(&dp->dl_perclnt);
2883                 locks_free_lock(fl);
2884                 return -ENOMEM;
2885         }
2886         fp->fi_lease = fl;
2887         fp->fi_deleg_file = get_file(fl->fl_file);
2888         atomic_set(&fp->fi_delegees, 1);
2889         list_add(&dp->dl_perfile, &fp->fi_delegations);
2890         return 0;
2891 }
2892
2893 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2894 {
2895         struct nfs4_file *fp = dp->dl_file;
2896
2897         if (!fp->fi_lease)
2898                 return nfs4_setlease(dp, flag);
2899         spin_lock(&recall_lock);
2900         if (fp->fi_had_conflict) {
2901                 spin_unlock(&recall_lock);
2902                 return -EAGAIN;
2903         }
2904         atomic_inc(&fp->fi_delegees);
2905         list_add(&dp->dl_perfile, &fp->fi_delegations);
2906         spin_unlock(&recall_lock);
2907         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2908         return 0;
2909 }
2910
2911 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2912 {
2913         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2914         if (status == -EAGAIN)
2915                 open->op_why_no_deleg = WND4_CONTENTION;
2916         else {
2917                 open->op_why_no_deleg = WND4_RESOURCE;
2918                 switch (open->op_deleg_want) {
2919                 case NFS4_SHARE_WANT_READ_DELEG:
2920                 case NFS4_SHARE_WANT_WRITE_DELEG:
2921                 case NFS4_SHARE_WANT_ANY_DELEG:
2922                         break;
2923                 case NFS4_SHARE_WANT_CANCEL:
2924                         open->op_why_no_deleg = WND4_CANCELLED;
2925                         break;
2926                 case NFS4_SHARE_WANT_NO_DELEG:
2927                         WARN_ON_ONCE(1);
2928                 }
2929         }
2930 }
2931
2932 /*
2933  * Attempt to hand out a delegation.
2934  */
2935 static void
2936 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
2937                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2938 {
2939         struct nfs4_delegation *dp;
2940         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2941         int cb_up;
2942         int status = 0, flag = 0;
2943
2944         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2945         flag = NFS4_OPEN_DELEGATE_NONE;
2946         open->op_recall = 0;
2947         switch (open->op_claim_type) {
2948                 case NFS4_OPEN_CLAIM_PREVIOUS:
2949                         if (!cb_up)
2950                                 open->op_recall = 1;
2951                         flag = open->op_delegate_type;
2952                         if (flag == NFS4_OPEN_DELEGATE_NONE)
2953                                 goto out;
2954                         break;
2955                 case NFS4_OPEN_CLAIM_NULL:
2956                         /* Let's not give out any delegations till everyone's
2957                          * had the chance to reclaim theirs.... */
2958                         if (locks_in_grace(net))
2959                                 goto out;
2960                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2961                                 goto out;
2962                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2963                                 flag = NFS4_OPEN_DELEGATE_WRITE;
2964                         else
2965                                 flag = NFS4_OPEN_DELEGATE_READ;
2966                         break;
2967                 default:
2968                         goto out;
2969         }
2970
2971         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2972         if (dp == NULL)
2973                 goto out_no_deleg;
2974         status = nfs4_set_delegation(dp, flag);
2975         if (status)
2976                 goto out_free;
2977
2978         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2979
2980         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2981                 STATEID_VAL(&dp->dl_stid.sc_stateid));
2982 out:
2983         open->op_delegate_type = flag;
2984         if (flag == NFS4_OPEN_DELEGATE_NONE) {
2985                 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2986                     open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2987                         dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2988
2989                 /* 4.1 client asking for a delegation? */
2990                 if (open->op_deleg_want)
2991                         nfsd4_open_deleg_none_ext(open, status);
2992         }
2993         return;
2994 out_free:
2995         nfs4_put_delegation(dp);
2996 out_no_deleg:
2997         flag = NFS4_OPEN_DELEGATE_NONE;
2998         goto out;
2999 }
3000
3001 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3002                                         struct nfs4_delegation *dp)
3003 {
3004         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3005             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3006                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3007                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3008         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3009                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3010                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3011                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3012         }
3013         /* Otherwise the client must be confused wanting a delegation
3014          * it already has, therefore we don't return
3015          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3016          */
3017 }
3018
3019 /*
3020  * called with nfs4_lock_state() held.
3021  */
3022 __be32
3023 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3024 {
3025         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3026         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3027         struct nfs4_file *fp = NULL;
3028         struct inode *ino = current_fh->fh_dentry->d_inode;
3029         struct nfs4_ol_stateid *stp = NULL;
3030         struct nfs4_delegation *dp = NULL;
3031         __be32 status;
3032
3033         /*
3034          * Lookup file; if found, lookup stateid and check open request,
3035          * and check for delegations in the process of being recalled.
3036          * If not found, create the nfs4_file struct
3037          */
3038         fp = find_file(ino);
3039         if (fp) {
3040                 if ((status = nfs4_check_open(fp, open, &stp)))
3041                         goto out;
3042                 status = nfs4_check_deleg(cl, fp, open, &dp);
3043                 if (status)
3044                         goto out;
3045         } else {
3046                 status = nfserr_bad_stateid;
3047                 if (nfsd4_is_deleg_cur(open))
3048                         goto out;
3049                 status = nfserr_jukebox;
3050                 fp = open->op_file;
3051                 open->op_file = NULL;
3052                 nfsd4_init_file(fp, ino);
3053         }
3054
3055         /*
3056          * OPEN the file, or upgrade an existing OPEN.
3057          * If truncate fails, the OPEN fails.
3058          */
3059         if (stp) {
3060                 /* Stateid was found, this is an OPEN upgrade */
3061                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3062                 if (status)
3063                         goto out;
3064         } else {
3065                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3066                 if (status)
3067                         goto out;
3068                 status = nfsd4_truncate(rqstp, current_fh, open);
3069                 if (status)
3070                         goto out;
3071                 stp = open->op_stp;
3072                 open->op_stp = NULL;
3073                 init_open_stateid(stp, fp, open);
3074         }
3075         update_stateid(&stp->st_stid.sc_stateid);
3076         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3077
3078         if (nfsd4_has_session(&resp->cstate)) {
3079                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3080
3081                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3082                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3083                         open->op_why_no_deleg = WND4_NOT_WANTED;
3084                         goto nodeleg;
3085                 }
3086         }
3087
3088         /*
3089         * Attempt to hand out a delegation. No error return, because the
3090         * OPEN succeeds even if we fail.
3091         */
3092         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3093 nodeleg:
3094         status = nfs_ok;
3095
3096         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3097                 STATEID_VAL(&stp->st_stid.sc_stateid));
3098 out:
3099         /* 4.1 client trying to upgrade/downgrade delegation? */
3100         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3101             open->op_deleg_want)
3102                 nfsd4_deleg_xgrade_none_ext(open, dp);
3103
3104         if (fp)
3105                 put_nfs4_file(fp);
3106         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3107                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3108         /*
3109         * To finish the open response, we just need to set the rflags.
3110         */
3111         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3112         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3113             !nfsd4_has_session(&resp->cstate))
3114                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3115
3116         return status;
3117 }
3118
3119 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3120 {
3121         if (open->op_openowner) {
3122                 struct nfs4_openowner *oo = open->op_openowner;
3123
3124                 if (!list_empty(&oo->oo_owner.so_stateids))
3125                         list_del_init(&oo->oo_close_lru);
3126                 if (oo->oo_flags & NFS4_OO_NEW) {
3127                         if (status) {
3128                                 release_openowner(oo);
3129                                 open->op_openowner = NULL;
3130                         } else
3131                                 oo->oo_flags &= ~NFS4_OO_NEW;
3132                 }
3133         }
3134         if (open->op_file)
3135                 nfsd4_free_file(open->op_file);
3136         if (open->op_stp)
3137                 free_generic_stateid(open->op_stp);
3138 }
3139
3140 __be32
3141 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3142             clientid_t *clid)
3143 {
3144         struct nfs4_client *clp;
3145         __be32 status;
3146         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3147
3148         nfs4_lock_state();
3149         dprintk("process_renew(%08x/%08x): starting\n", 
3150                         clid->cl_boot, clid->cl_id);
3151         status = nfserr_stale_clientid;
3152         if (STALE_CLIENTID(clid, nn))
3153                 goto out;
3154         clp = find_confirmed_client(clid, cstate->minorversion, nn);
3155         status = nfserr_expired;
3156         if (clp == NULL) {
3157                 /* We assume the client took too long to RENEW. */
3158                 dprintk("nfsd4_renew: clientid not found!\n");
3159                 goto out;
3160         }
3161         status = nfserr_cb_path_down;
3162         if (!list_empty(&clp->cl_delegations)
3163                         && clp->cl_cb_state != NFSD4_CB_UP)
3164                 goto out;
3165         status = nfs_ok;
3166 out:
3167         nfs4_unlock_state();
3168         return status;
3169 }
3170
3171 static void
3172 nfsd4_end_grace(struct nfsd_net *nn)
3173 {
3174         /* do nothing if grace period already ended */
3175         if (nn->grace_ended)
3176                 return;
3177
3178         dprintk("NFSD: end of grace period\n");
3179         nn->grace_ended = true;
3180         nfsd4_record_grace_done(nn, nn->boot_time);
3181         locks_end_grace(&nn->nfsd4_manager);
3182         /*
3183          * Now that every NFSv4 client has had the chance to recover and
3184          * to see the (possibly new, possibly shorter) lease time, we
3185          * can safely set the next grace time to the current lease time:
3186          */
3187         nfsd4_grace = nfsd4_lease;
3188 }
3189
3190 static time_t
3191 nfs4_laundromat(struct nfsd_net *nn)
3192 {
3193         struct nfs4_client *clp;
3194         struct nfs4_openowner *oo;
3195         struct nfs4_delegation *dp;
3196         struct list_head *pos, *next, reaplist;
3197         time_t cutoff = get_seconds() - nfsd4_lease;
3198         time_t t, clientid_val = nfsd4_lease;
3199         time_t u, test_val = nfsd4_lease;
3200
3201         nfs4_lock_state();
3202
3203         dprintk("NFSD: laundromat service - starting\n");
3204         nfsd4_end_grace(nn);
3205         INIT_LIST_HEAD(&reaplist);
3206         spin_lock(&nn->client_lock);
3207         list_for_each_safe(pos, next, &nn->client_lru) {
3208                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3209                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3210                         t = clp->cl_time - cutoff;
3211                         if (clientid_val > t)
3212                                 clientid_val = t;
3213                         break;
3214                 }
3215                 if (atomic_read(&clp->cl_refcount)) {
3216                         dprintk("NFSD: client in use (clientid %08x)\n",
3217                                 clp->cl_clientid.cl_id);
3218                         continue;
3219                 }
3220                 unhash_client_locked(clp);
3221                 list_add(&clp->cl_lru, &reaplist);
3222         }
3223         spin_unlock(&nn->client_lock);
3224         list_for_each_safe(pos, next, &reaplist) {
3225                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3226                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3227                         clp->cl_clientid.cl_id);
3228                 expire_client(clp);
3229         }
3230         spin_lock(&recall_lock);
3231         list_for_each_safe(pos, next, &del_recall_lru) {
3232                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3233                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3234                         u = dp->dl_time - cutoff;
3235                         if (test_val > u)
3236                                 test_val = u;
3237                         break;
3238                 }
3239                 list_move(&dp->dl_recall_lru, &reaplist);
3240         }
3241         spin_unlock(&recall_lock);
3242         list_for_each_safe(pos, next, &reaplist) {
3243                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3244                 unhash_delegation(dp);
3245         }
3246         test_val = nfsd4_lease;
3247         list_for_each_safe(pos, next, &nn->close_lru) {
3248                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3249                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3250                         u = oo->oo_time - cutoff;
3251                         if (test_val > u)
3252                                 test_val = u;
3253                         break;
3254                 }
3255                 release_openowner(oo);
3256         }
3257         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3258                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3259         nfs4_unlock_state();
3260         return clientid_val;
3261 }
3262
3263 static struct workqueue_struct *laundry_wq;
3264 static void laundromat_main(struct work_struct *);
3265
3266 static void
3267 laundromat_main(struct work_struct *laundry)
3268 {
3269         time_t t;
3270         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3271                                                   work);
3272         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3273                                            laundromat_work);
3274
3275         t = nfs4_laundromat(nn);
3276         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3277         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3278 }
3279
3280 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3281 {
3282         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3283                 return nfserr_bad_stateid;
3284         return nfs_ok;
3285 }
3286
3287 static int
3288 STALE_STATEID(stateid_t *stateid, struct nfsd_net *nn)
3289 {
3290         if (stateid->si_opaque.so_clid.cl_boot == nn->boot_time)
3291                 return 0;
3292         dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3293                 STATEID_VAL(stateid));
3294         return 1;
3295 }
3296
3297 static inline int
3298 access_permit_read(struct nfs4_ol_stateid *stp)
3299 {
3300         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3301                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3302                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3303 }
3304
3305 static inline int
3306 access_permit_write(struct nfs4_ol_stateid *stp)
3307 {
3308         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3309                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3310 }
3311
3312 static
3313 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3314 {
3315         __be32 status = nfserr_openmode;
3316
3317         /* For lock stateid's, we test the parent open, not the lock: */
3318         if (stp->st_openstp)
3319                 stp = stp->st_openstp;
3320         if ((flags & WR_STATE) && !access_permit_write(stp))
3321                 goto out;
3322         if ((flags & RD_STATE) && !access_permit_read(stp))
3323                 goto out;
3324         status = nfs_ok;
3325 out:
3326         return status;
3327 }
3328
3329 static inline __be32
3330 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3331 {
3332         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3333                 return nfs_ok;
3334         else if (locks_in_grace(net)) {
3335                 /* Answer in remaining cases depends on existence of
3336                  * conflicting state; so we must wait out the grace period. */
3337                 return nfserr_grace;
3338         } else if (flags & WR_STATE)
3339                 return nfs4_share_conflict(current_fh,
3340                                 NFS4_SHARE_DENY_WRITE);