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Linux/fs/nfsd/nfs4state.c

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  1 /*
  2 *  Copyright (c) 2001 The Regents of the University of Michigan.
  3 *  All rights reserved.
  4 *
  5 *  Kendrick Smith <kmsmith@umich.edu>
  6 *  Andy Adamson <kandros@umich.edu>
  7 *
  8 *  Redistribution and use in source and binary forms, with or without
  9 *  modification, are permitted provided that the following conditions
 10 *  are met:
 11 *
 12 *  1. Redistributions of source code must retain the above copyright
 13 *     notice, this list of conditions and the following disclaimer.
 14 *  2. Redistributions in binary form must reproduce the above copyright
 15 *     notice, this list of conditions and the following disclaimer in the
 16 *     documentation and/or other materials provided with the distribution.
 17 *  3. Neither the name of the University nor the names of its
 18 *     contributors may be used to endorse or promote products derived
 19 *     from this software without specific prior written permission.
 20 *
 21 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 22 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 23 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 24 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 25 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 26 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 27 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 28 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 29 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 30 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 31 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 32 *
 33 */
 34 
 35 #include <linux/file.h>
 36 #include <linux/fs.h>
 37 #include <linux/slab.h>
 38 #include <linux/namei.h>
 39 #include <linux/swap.h>
 40 #include <linux/pagemap.h>
 41 #include <linux/ratelimit.h>
 42 #include <linux/sunrpc/svcauth_gss.h>
 43 #include <linux/sunrpc/addr.h>
 44 #include "xdr4.h"
 45 #include "xdr4cb.h"
 46 #include "vfs.h"
 47 #include "current_stateid.h"
 48 
 49 #include "netns.h"
 50 
 51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 52 
 53 #define all_ones {{~0,~0},~0}
 54 static const stateid_t one_stateid = {
 55         .si_generation = ~0,
 56         .si_opaque = all_ones,
 57 };
 58 static const stateid_t zero_stateid = {
 59         /* all fields zero */
 60 };
 61 static const stateid_t currentstateid = {
 62         .si_generation = 1,
 63 };
 64 
 65 static u64 current_sessionid = 1;
 66 
 67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
 68 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
 69 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
 70 
 71 /* forward declarations */
 72 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
 73 
 74 /* Locking: */
 75 
 76 /* Currently used for almost all code touching nfsv4 state: */
 77 static DEFINE_MUTEX(client_mutex);
 78 
 79 /*
 80  * Currently used for the del_recall_lru and file hash table.  In an
 81  * effort to decrease the scope of the client_mutex, this spinlock may
 82  * eventually cover more:
 83  */
 84 static DEFINE_SPINLOCK(recall_lock);
 85 
 86 static struct kmem_cache *openowner_slab = NULL;
 87 static struct kmem_cache *lockowner_slab = NULL;
 88 static struct kmem_cache *file_slab = NULL;
 89 static struct kmem_cache *stateid_slab = NULL;
 90 static struct kmem_cache *deleg_slab = NULL;
 91 
 92 void
 93 nfs4_lock_state(void)
 94 {
 95         mutex_lock(&client_mutex);
 96 }
 97 
 98 static void free_session(struct nfsd4_session *);
 99 
100 static bool is_session_dead(struct nfsd4_session *ses)
101 {
102         return ses->se_flags & NFS4_SESSION_DEAD;
103 }
104 
105 void nfsd4_put_session(struct nfsd4_session *ses)
106 {
107         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
108                 free_session(ses);
109 }
110 
111 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
112 {
113         if (atomic_read(&ses->se_ref) > ref_held_by_me)
114                 return nfserr_jukebox;
115         ses->se_flags |= NFS4_SESSION_DEAD;
116         return nfs_ok;
117 }
118 
119 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
120 {
121         if (is_session_dead(ses))
122                 return nfserr_badsession;
123         atomic_inc(&ses->se_ref);
124         return nfs_ok;
125 }
126 
127 void
128 nfs4_unlock_state(void)
129 {
130         mutex_unlock(&client_mutex);
131 }
132 
133 static bool is_client_expired(struct nfs4_client *clp)
134 {
135         return clp->cl_time == 0;
136 }
137 
138 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
139 {
140         if (atomic_read(&clp->cl_refcount))
141                 return nfserr_jukebox;
142         clp->cl_time = 0;
143         return nfs_ok;
144 }
145 
146 static __be32 mark_client_expired(struct nfs4_client *clp)
147 {
148         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
149         __be32 ret;
150 
151         spin_lock(&nn->client_lock);
152         ret = mark_client_expired_locked(clp);
153         spin_unlock(&nn->client_lock);
154         return ret;
155 }
156 
157 static __be32 get_client_locked(struct nfs4_client *clp)
158 {
159         if (is_client_expired(clp))
160                 return nfserr_expired;
161         atomic_inc(&clp->cl_refcount);
162         return nfs_ok;
163 }
164 
165 /* must be called under the client_lock */
166 static inline void
167 renew_client_locked(struct nfs4_client *clp)
168 {
169         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
170 
171         if (is_client_expired(clp)) {
172                 WARN_ON(1);
173                 printk("%s: client (clientid %08x/%08x) already expired\n",
174                         __func__,
175                         clp->cl_clientid.cl_boot,
176                         clp->cl_clientid.cl_id);
177                 return;
178         }
179 
180         dprintk("renewing client (clientid %08x/%08x)\n",
181                         clp->cl_clientid.cl_boot,
182                         clp->cl_clientid.cl_id);
183         list_move_tail(&clp->cl_lru, &nn->client_lru);
184         clp->cl_time = get_seconds();
185 }
186 
187 static inline void
188 renew_client(struct nfs4_client *clp)
189 {
190         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
191 
192         spin_lock(&nn->client_lock);
193         renew_client_locked(clp);
194         spin_unlock(&nn->client_lock);
195 }
196 
197 static void put_client_renew_locked(struct nfs4_client *clp)
198 {
199         if (!atomic_dec_and_test(&clp->cl_refcount))
200                 return;
201         if (!is_client_expired(clp))
202                 renew_client_locked(clp);
203 }
204 
205 void put_client_renew(struct nfs4_client *clp)
206 {
207         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
208 
209         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
210                 return;
211         if (!is_client_expired(clp))
212                 renew_client_locked(clp);
213         spin_unlock(&nn->client_lock);
214 }
215 
216 
217 static inline u32
218 opaque_hashval(const void *ptr, int nbytes)
219 {
220         unsigned char *cptr = (unsigned char *) ptr;
221 
222         u32 x = 0;
223         while (nbytes--) {
224                 x *= 37;
225                 x += *cptr++;
226         }
227         return x;
228 }
229 
230 static void nfsd4_free_file(struct nfs4_file *f)
231 {
232         kmem_cache_free(file_slab, f);
233 }
234 
235 static inline void
236 put_nfs4_file(struct nfs4_file *fi)
237 {
238         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
239                 hlist_del(&fi->fi_hash);
240                 spin_unlock(&recall_lock);
241                 iput(fi->fi_inode);
242                 nfsd4_free_file(fi);
243         }
244 }
245 
246 static inline void
247 get_nfs4_file(struct nfs4_file *fi)
248 {
249         atomic_inc(&fi->fi_ref);
250 }
251 
252 static int num_delegations;
253 unsigned long max_delegations;
254 
255 /*
256  * Open owner state (share locks)
257  */
258 
259 /* hash tables for lock and open owners */
260 #define OWNER_HASH_BITS              8
261 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
262 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
263 
264 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
265 {
266         unsigned int ret;
267 
268         ret = opaque_hashval(ownername->data, ownername->len);
269         ret += clientid;
270         return ret & OWNER_HASH_MASK;
271 }
272 
273 /* hash table for nfs4_file */
274 #define FILE_HASH_BITS                   8
275 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
276 
277 static unsigned int file_hashval(struct inode *ino)
278 {
279         /* XXX: why are we hashing on inode pointer, anyway? */
280         return hash_ptr(ino, FILE_HASH_BITS);
281 }
282 
283 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
284 
285 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
286 {
287         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
288         atomic_inc(&fp->fi_access[oflag]);
289 }
290 
291 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
292 {
293         if (oflag == O_RDWR) {
294                 __nfs4_file_get_access(fp, O_RDONLY);
295                 __nfs4_file_get_access(fp, O_WRONLY);
296         } else
297                 __nfs4_file_get_access(fp, oflag);
298 }
299 
300 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
301 {
302         if (fp->fi_fds[oflag]) {
303                 fput(fp->fi_fds[oflag]);
304                 fp->fi_fds[oflag] = NULL;
305         }
306 }
307 
308 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
309 {
310         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
311                 nfs4_file_put_fd(fp, oflag);
312                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
313                         nfs4_file_put_fd(fp, O_RDWR);
314         }
315 }
316 
317 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
318 {
319         if (oflag == O_RDWR) {
320                 __nfs4_file_put_access(fp, O_RDONLY);
321                 __nfs4_file_put_access(fp, O_WRONLY);
322         } else
323                 __nfs4_file_put_access(fp, oflag);
324 }
325 
326 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
327 kmem_cache *slab)
328 {
329         struct idr *stateids = &cl->cl_stateids;
330         struct nfs4_stid *stid;
331         int new_id;
332 
333         stid = kmem_cache_alloc(slab, GFP_KERNEL);
334         if (!stid)
335                 return NULL;
336 
337         new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
338         if (new_id < 0)
339                 goto out_free;
340         stid->sc_client = cl;
341         stid->sc_type = 0;
342         stid->sc_stateid.si_opaque.so_id = new_id;
343         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
344         /* Will be incremented before return to client: */
345         stid->sc_stateid.si_generation = 0;
346 
347         /*
348          * It shouldn't be a problem to reuse an opaque stateid value.
349          * I don't think it is for 4.1.  But with 4.0 I worry that, for
350          * example, a stray write retransmission could be accepted by
351          * the server when it should have been rejected.  Therefore,
352          * adopt a trick from the sctp code to attempt to maximize the
353          * amount of time until an id is reused, by ensuring they always
354          * "increase" (mod INT_MAX):
355          */
356         return stid;
357 out_free:
358         kmem_cache_free(slab, stid);
359         return NULL;
360 }
361 
362 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
363 {
364         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
365 }
366 
367 static struct nfs4_delegation *
368 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
369 {
370         struct nfs4_delegation *dp;
371 
372         dprintk("NFSD alloc_init_deleg\n");
373         if (num_delegations > max_delegations)
374                 return NULL;
375         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
376         if (dp == NULL)
377                 return dp;
378         dp->dl_stid.sc_type = NFS4_DELEG_STID;
379         /*
380          * delegation seqid's are never incremented.  The 4.1 special
381          * meaning of seqid 0 isn't meaningful, really, but let's avoid
382          * 0 anyway just for consistency and use 1:
383          */
384         dp->dl_stid.sc_stateid.si_generation = 1;
385         num_delegations++;
386         INIT_LIST_HEAD(&dp->dl_perfile);
387         INIT_LIST_HEAD(&dp->dl_perclnt);
388         INIT_LIST_HEAD(&dp->dl_recall_lru);
389         dp->dl_file = NULL;
390         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
391         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
392         dp->dl_time = 0;
393         atomic_set(&dp->dl_count, 1);
394         nfsd4_init_callback(&dp->dl_recall);
395         return dp;
396 }
397 
398 static void remove_stid(struct nfs4_stid *s)
399 {
400         struct idr *stateids = &s->sc_client->cl_stateids;
401 
402         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
403 }
404 
405 void
406 nfs4_put_delegation(struct nfs4_delegation *dp)
407 {
408         if (atomic_dec_and_test(&dp->dl_count)) {
409                 kmem_cache_free(deleg_slab, dp);
410                 num_delegations--;
411         }
412 }
413 
414 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
415 {
416         if (atomic_dec_and_test(&fp->fi_delegees)) {
417                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
418                 fp->fi_lease = NULL;
419                 fput(fp->fi_deleg_file);
420                 fp->fi_deleg_file = NULL;
421         }
422 }
423 
424 static void unhash_stid(struct nfs4_stid *s)
425 {
426         s->sc_type = 0;
427 }
428 
429 /* Called under the state lock. */
430 static void
431 unhash_delegation(struct nfs4_delegation *dp)
432 {
433         list_del_init(&dp->dl_perclnt);
434         spin_lock(&recall_lock);
435         list_del_init(&dp->dl_perfile);
436         list_del_init(&dp->dl_recall_lru);
437         spin_unlock(&recall_lock);
438         nfs4_put_deleg_lease(dp->dl_file);
439         put_nfs4_file(dp->dl_file);
440         dp->dl_file = NULL;
441 }
442 
443 
444 
445 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
446 {
447         list_del_init(&dp->dl_recall_lru);
448         remove_stid(&dp->dl_stid);
449         nfs4_put_delegation(dp);
450 }
451 
452 static void destroy_delegation(struct nfs4_delegation *dp)
453 {
454         unhash_delegation(dp);
455         remove_stid(&dp->dl_stid);
456         nfs4_put_delegation(dp);
457 }
458 
459 static void revoke_delegation(struct nfs4_delegation *dp)
460 {
461         struct nfs4_client *clp = dp->dl_stid.sc_client;
462 
463         if (clp->cl_minorversion == 0)
464                 destroy_delegation(dp);
465         else {
466                 unhash_delegation(dp);
467                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
468                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
469         }
470 }
471 
472 /* 
473  * SETCLIENTID state 
474  */
475 
476 static unsigned int clientid_hashval(u32 id)
477 {
478         return id & CLIENT_HASH_MASK;
479 }
480 
481 static unsigned int clientstr_hashval(const char *name)
482 {
483         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
484 }
485 
486 /*
487  * We store the NONE, READ, WRITE, and BOTH bits separately in the
488  * st_{access,deny}_bmap field of the stateid, in order to track not
489  * only what share bits are currently in force, but also what
490  * combinations of share bits previous opens have used.  This allows us
491  * to enforce the recommendation of rfc 3530 14.2.19 that the server
492  * return an error if the client attempt to downgrade to a combination
493  * of share bits not explicable by closing some of its previous opens.
494  *
495  * XXX: This enforcement is actually incomplete, since we don't keep
496  * track of access/deny bit combinations; so, e.g., we allow:
497  *
498  *      OPEN allow read, deny write
499  *      OPEN allow both, deny none
500  *      DOWNGRADE allow read, deny none
501  *
502  * which we should reject.
503  */
504 static unsigned int
505 bmap_to_share_mode(unsigned long bmap) {
506         int i;
507         unsigned int access = 0;
508 
509         for (i = 1; i < 4; i++) {
510                 if (test_bit(i, &bmap))
511                         access |= i;
512         }
513         return access;
514 }
515 
516 static bool
517 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
518         unsigned int access, deny;
519 
520         access = bmap_to_share_mode(stp->st_access_bmap);
521         deny = bmap_to_share_mode(stp->st_deny_bmap);
522         if ((access & open->op_share_deny) || (deny & open->op_share_access))
523                 return false;
524         return true;
525 }
526 
527 /* set share access for a given stateid */
528 static inline void
529 set_access(u32 access, struct nfs4_ol_stateid *stp)
530 {
531         __set_bit(access, &stp->st_access_bmap);
532 }
533 
534 /* clear share access for a given stateid */
535 static inline void
536 clear_access(u32 access, struct nfs4_ol_stateid *stp)
537 {
538         __clear_bit(access, &stp->st_access_bmap);
539 }
540 
541 /* test whether a given stateid has access */
542 static inline bool
543 test_access(u32 access, struct nfs4_ol_stateid *stp)
544 {
545         return test_bit(access, &stp->st_access_bmap);
546 }
547 
548 /* set share deny for a given stateid */
549 static inline void
550 set_deny(u32 access, struct nfs4_ol_stateid *stp)
551 {
552         __set_bit(access, &stp->st_deny_bmap);
553 }
554 
555 /* clear share deny for a given stateid */
556 static inline void
557 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
558 {
559         __clear_bit(access, &stp->st_deny_bmap);
560 }
561 
562 /* test whether a given stateid is denying specific access */
563 static inline bool
564 test_deny(u32 access, struct nfs4_ol_stateid *stp)
565 {
566         return test_bit(access, &stp->st_deny_bmap);
567 }
568 
569 static int nfs4_access_to_omode(u32 access)
570 {
571         switch (access & NFS4_SHARE_ACCESS_BOTH) {
572         case NFS4_SHARE_ACCESS_READ:
573                 return O_RDONLY;
574         case NFS4_SHARE_ACCESS_WRITE:
575                 return O_WRONLY;
576         case NFS4_SHARE_ACCESS_BOTH:
577                 return O_RDWR;
578         }
579         WARN_ON_ONCE(1);
580         return O_RDONLY;
581 }
582 
583 /* release all access and file references for a given stateid */
584 static void
585 release_all_access(struct nfs4_ol_stateid *stp)
586 {
587         int i;
588 
589         for (i = 1; i < 4; i++) {
590                 if (test_access(i, stp))
591                         nfs4_file_put_access(stp->st_file,
592                                              nfs4_access_to_omode(i));
593                 clear_access(i, stp);
594         }
595 }
596 
597 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
598 {
599         list_del(&stp->st_perfile);
600         list_del(&stp->st_perstateowner);
601 }
602 
603 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
604 {
605         release_all_access(stp);
606         put_nfs4_file(stp->st_file);
607         stp->st_file = NULL;
608 }
609 
610 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
611 {
612         remove_stid(&stp->st_stid);
613         kmem_cache_free(stateid_slab, stp);
614 }
615 
616 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
617 {
618         struct file *file;
619 
620         unhash_generic_stateid(stp);
621         unhash_stid(&stp->st_stid);
622         file = find_any_file(stp->st_file);
623         if (file)
624                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
625         close_generic_stateid(stp);
626         free_generic_stateid(stp);
627 }
628 
629 static void unhash_lockowner(struct nfs4_lockowner *lo)
630 {
631         struct nfs4_ol_stateid *stp;
632 
633         list_del(&lo->lo_owner.so_strhash);
634         list_del(&lo->lo_perstateid);
635         list_del(&lo->lo_owner_ino_hash);
636         while (!list_empty(&lo->lo_owner.so_stateids)) {
637                 stp = list_first_entry(&lo->lo_owner.so_stateids,
638                                 struct nfs4_ol_stateid, st_perstateowner);
639                 release_lock_stateid(stp);
640         }
641 }
642 
643 static void release_lockowner(struct nfs4_lockowner *lo)
644 {
645         unhash_lockowner(lo);
646         nfs4_free_lockowner(lo);
647 }
648 
649 static void
650 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
651 {
652         struct nfs4_lockowner *lo;
653 
654         while (!list_empty(&open_stp->st_lockowners)) {
655                 lo = list_entry(open_stp->st_lockowners.next,
656                                 struct nfs4_lockowner, lo_perstateid);
657                 release_lockowner(lo);
658         }
659 }
660 
661 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
662 {
663         unhash_generic_stateid(stp);
664         release_stateid_lockowners(stp);
665         close_generic_stateid(stp);
666 }
667 
668 static void release_open_stateid(struct nfs4_ol_stateid *stp)
669 {
670         unhash_open_stateid(stp);
671         unhash_stid(&stp->st_stid);
672         free_generic_stateid(stp);
673 }
674 
675 static void unhash_openowner(struct nfs4_openowner *oo)
676 {
677         struct nfs4_ol_stateid *stp;
678 
679         list_del(&oo->oo_owner.so_strhash);
680         list_del(&oo->oo_perclient);
681         while (!list_empty(&oo->oo_owner.so_stateids)) {
682                 stp = list_first_entry(&oo->oo_owner.so_stateids,
683                                 struct nfs4_ol_stateid, st_perstateowner);
684                 release_open_stateid(stp);
685         }
686 }
687 
688 static void release_last_closed_stateid(struct nfs4_openowner *oo)
689 {
690         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
691 
692         if (s) {
693                 unhash_stid(&s->st_stid);
694                 free_generic_stateid(s);
695                 oo->oo_last_closed_stid = NULL;
696         }
697 }
698 
699 static void release_openowner(struct nfs4_openowner *oo)
700 {
701         unhash_openowner(oo);
702         list_del(&oo->oo_close_lru);
703         release_last_closed_stateid(oo);
704         nfs4_free_openowner(oo);
705 }
706 
707 static inline int
708 hash_sessionid(struct nfs4_sessionid *sessionid)
709 {
710         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
711 
712         return sid->sequence % SESSION_HASH_SIZE;
713 }
714 
715 #ifdef NFSD_DEBUG
716 static inline void
717 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
718 {
719         u32 *ptr = (u32 *)(&sessionid->data[0]);
720         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
721 }
722 #else
723 static inline void
724 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
725 {
726 }
727 #endif
728 
729 /*
730  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
731  * won't be used for replay.
732  */
733 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
734 {
735         struct nfs4_stateowner *so = cstate->replay_owner;
736 
737         if (nfserr == nfserr_replay_me)
738                 return;
739 
740         if (!seqid_mutating_err(ntohl(nfserr))) {
741                 cstate->replay_owner = NULL;
742                 return;
743         }
744         if (!so)
745                 return;
746         if (so->so_is_open_owner)
747                 release_last_closed_stateid(openowner(so));
748         so->so_seqid++;
749         return;
750 }
751 
752 static void
753 gen_sessionid(struct nfsd4_session *ses)
754 {
755         struct nfs4_client *clp = ses->se_client;
756         struct nfsd4_sessionid *sid;
757 
758         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
759         sid->clientid = clp->cl_clientid;
760         sid->sequence = current_sessionid++;
761         sid->reserved = 0;
762 }
763 
764 /*
765  * The protocol defines ca_maxresponssize_cached to include the size of
766  * the rpc header, but all we need to cache is the data starting after
767  * the end of the initial SEQUENCE operation--the rest we regenerate
768  * each time.  Therefore we can advertise a ca_maxresponssize_cached
769  * value that is the number of bytes in our cache plus a few additional
770  * bytes.  In order to stay on the safe side, and not promise more than
771  * we can cache, those additional bytes must be the minimum possible: 24
772  * bytes of rpc header (xid through accept state, with AUTH_NULL
773  * verifier), 12 for the compound header (with zero-length tag), and 44
774  * for the SEQUENCE op response:
775  */
776 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
777 
778 static void
779 free_session_slots(struct nfsd4_session *ses)
780 {
781         int i;
782 
783         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
784                 kfree(ses->se_slots[i]);
785 }
786 
787 /*
788  * We don't actually need to cache the rpc and session headers, so we
789  * can allocate a little less for each slot:
790  */
791 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
792 {
793         u32 size;
794 
795         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
796                 size = 0;
797         else
798                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
799         return size + sizeof(struct nfsd4_slot);
800 }
801 
802 /*
803  * XXX: If we run out of reserved DRC memory we could (up to a point)
804  * re-negotiate active sessions and reduce their slot usage to make
805  * room for new connections. For now we just fail the create session.
806  */
807 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
808 {
809         u32 slotsize = slot_bytes(ca);
810         u32 num = ca->maxreqs;
811         int avail;
812 
813         spin_lock(&nfsd_drc_lock);
814         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
815                     nfsd_drc_max_mem - nfsd_drc_mem_used);
816         num = min_t(int, num, avail / slotsize);
817         nfsd_drc_mem_used += num * slotsize;
818         spin_unlock(&nfsd_drc_lock);
819 
820         return num;
821 }
822 
823 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
824 {
825         int slotsize = slot_bytes(ca);
826 
827         spin_lock(&nfsd_drc_lock);
828         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
829         spin_unlock(&nfsd_drc_lock);
830 }
831 
832 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *attrs)
833 {
834         int numslots = attrs->maxreqs;
835         int slotsize = slot_bytes(attrs);
836         struct nfsd4_session *new;
837         int mem, i;
838 
839         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
840                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
841         mem = numslots * sizeof(struct nfsd4_slot *);
842 
843         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
844         if (!new)
845                 return NULL;
846         /* allocate each struct nfsd4_slot and data cache in one piece */
847         for (i = 0; i < numslots; i++) {
848                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
849                 if (!new->se_slots[i])
850                         goto out_free;
851         }
852         return new;
853 out_free:
854         while (i--)
855                 kfree(new->se_slots[i]);
856         kfree(new);
857         return NULL;
858 }
859 
860 static void free_conn(struct nfsd4_conn *c)
861 {
862         svc_xprt_put(c->cn_xprt);
863         kfree(c);
864 }
865 
866 static void nfsd4_conn_lost(struct svc_xpt_user *u)
867 {
868         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
869         struct nfs4_client *clp = c->cn_session->se_client;
870 
871         spin_lock(&clp->cl_lock);
872         if (!list_empty(&c->cn_persession)) {
873                 list_del(&c->cn_persession);
874                 free_conn(c);
875         }
876         nfsd4_probe_callback(clp);
877         spin_unlock(&clp->cl_lock);
878 }
879 
880 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
881 {
882         struct nfsd4_conn *conn;
883 
884         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
885         if (!conn)
886                 return NULL;
887         svc_xprt_get(rqstp->rq_xprt);
888         conn->cn_xprt = rqstp->rq_xprt;
889         conn->cn_flags = flags;
890         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
891         return conn;
892 }
893 
894 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
895 {
896         conn->cn_session = ses;
897         list_add(&conn->cn_persession, &ses->se_conns);
898 }
899 
900 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
901 {
902         struct nfs4_client *clp = ses->se_client;
903 
904         spin_lock(&clp->cl_lock);
905         __nfsd4_hash_conn(conn, ses);
906         spin_unlock(&clp->cl_lock);
907 }
908 
909 static int nfsd4_register_conn(struct nfsd4_conn *conn)
910 {
911         conn->cn_xpt_user.callback = nfsd4_conn_lost;
912         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
913 }
914 
915 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
916 {
917         int ret;
918 
919         nfsd4_hash_conn(conn, ses);
920         ret = nfsd4_register_conn(conn);
921         if (ret)
922                 /* oops; xprt is already down: */
923                 nfsd4_conn_lost(&conn->cn_xpt_user);
924         if (conn->cn_flags & NFS4_CDFC4_BACK) {
925                 /* callback channel may be back up */
926                 nfsd4_probe_callback(ses->se_client);
927         }
928 }
929 
930 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
931 {
932         u32 dir = NFS4_CDFC4_FORE;
933 
934         if (cses->flags & SESSION4_BACK_CHAN)
935                 dir |= NFS4_CDFC4_BACK;
936         return alloc_conn(rqstp, dir);
937 }
938 
939 /* must be called under client_lock */
940 static void nfsd4_del_conns(struct nfsd4_session *s)
941 {
942         struct nfs4_client *clp = s->se_client;
943         struct nfsd4_conn *c;
944 
945         spin_lock(&clp->cl_lock);
946         while (!list_empty(&s->se_conns)) {
947                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
948                 list_del_init(&c->cn_persession);
949                 spin_unlock(&clp->cl_lock);
950 
951                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
952                 free_conn(c);
953 
954                 spin_lock(&clp->cl_lock);
955         }
956         spin_unlock(&clp->cl_lock);
957 }
958 
959 static void __free_session(struct nfsd4_session *ses)
960 {
961         free_session_slots(ses);
962         kfree(ses);
963 }
964 
965 static void free_session(struct nfsd4_session *ses)
966 {
967         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
968 
969         lockdep_assert_held(&nn->client_lock);
970         nfsd4_del_conns(ses);
971         nfsd4_put_drc_mem(&ses->se_fchannel);
972         __free_session(ses);
973 }
974 
975 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
976 {
977         int idx;
978         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
979 
980         new->se_client = clp;
981         gen_sessionid(new);
982 
983         INIT_LIST_HEAD(&new->se_conns);
984 
985         new->se_cb_seq_nr = 1;
986         new->se_flags = cses->flags;
987         new->se_cb_prog = cses->callback_prog;
988         new->se_cb_sec = cses->cb_sec;
989         atomic_set(&new->se_ref, 0);
990         idx = hash_sessionid(&new->se_sessionid);
991         spin_lock(&nn->client_lock);
992         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
993         spin_lock(&clp->cl_lock);
994         list_add(&new->se_perclnt, &clp->cl_sessions);
995         spin_unlock(&clp->cl_lock);
996         spin_unlock(&nn->client_lock);
997         memcpy(&new->se_fchannel, &cses->fore_channel,
998                         sizeof(struct nfsd4_channel_attrs));
999         if (cses->flags & SESSION4_BACK_CHAN) {
1000                 struct sockaddr *sa = svc_addr(rqstp);
1001                 /*
1002                  * This is a little silly; with sessions there's no real
1003                  * use for the callback address.  Use the peer address
1004                  * as a reasonable default for now, but consider fixing
1005                  * the rpc client not to require an address in the
1006                  * future:
1007                  */
1008                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1009                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1010         }
1011 }
1012 
1013 /* caller must hold client_lock */
1014 static struct nfsd4_session *
1015 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1016 {
1017         struct nfsd4_session *elem;
1018         int idx;
1019         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1020 
1021         dump_sessionid(__func__, sessionid);
1022         idx = hash_sessionid(sessionid);
1023         /* Search in the appropriate list */
1024         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1025                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1026                             NFS4_MAX_SESSIONID_LEN)) {
1027                         return elem;
1028                 }
1029         }
1030 
1031         dprintk("%s: session not found\n", __func__);
1032         return NULL;
1033 }
1034 
1035 /* caller must hold client_lock */
1036 static void
1037 unhash_session(struct nfsd4_session *ses)
1038 {
1039         list_del(&ses->se_hash);
1040         spin_lock(&ses->se_client->cl_lock);
1041         list_del(&ses->se_perclnt);
1042         spin_unlock(&ses->se_client->cl_lock);
1043 }
1044 
1045 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1046 static int
1047 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1048 {
1049         if (clid->cl_boot == nn->boot_time)
1050                 return 0;
1051         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1052                 clid->cl_boot, clid->cl_id, nn->boot_time);
1053         return 1;
1054 }
1055 
1056 /* 
1057  * XXX Should we use a slab cache ?
1058  * This type of memory management is somewhat inefficient, but we use it
1059  * anyway since SETCLIENTID is not a common operation.
1060  */
1061 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1062 {
1063         struct nfs4_client *clp;
1064 
1065         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1066         if (clp == NULL)
1067                 return NULL;
1068         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1069         if (clp->cl_name.data == NULL) {
1070                 kfree(clp);
1071                 return NULL;
1072         }
1073         clp->cl_name.len = name.len;
1074         INIT_LIST_HEAD(&clp->cl_sessions);
1075         idr_init(&clp->cl_stateids);
1076         atomic_set(&clp->cl_refcount, 0);
1077         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1078         INIT_LIST_HEAD(&clp->cl_idhash);
1079         INIT_LIST_HEAD(&clp->cl_openowners);
1080         INIT_LIST_HEAD(&clp->cl_delegations);
1081         INIT_LIST_HEAD(&clp->cl_lru);
1082         INIT_LIST_HEAD(&clp->cl_callbacks);
1083         INIT_LIST_HEAD(&clp->cl_revoked);
1084         spin_lock_init(&clp->cl_lock);
1085         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1086         return clp;
1087 }
1088 
1089 static inline void
1090 free_client(struct nfs4_client *clp)
1091 {
1092         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1093 
1094         lockdep_assert_held(&nn->client_lock);
1095         while (!list_empty(&clp->cl_sessions)) {
1096                 struct nfsd4_session *ses;
1097                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1098                                 se_perclnt);
1099                 list_del(&ses->se_perclnt);
1100                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1101                 free_session(ses);
1102         }
1103         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1104         free_svc_cred(&clp->cl_cred);
1105         kfree(clp->cl_name.data);
1106         idr_destroy(&clp->cl_stateids);
1107         kfree(clp);
1108 }
1109 
1110 /* must be called under the client_lock */
1111 static inline void
1112 unhash_client_locked(struct nfs4_client *clp)
1113 {
1114         struct nfsd4_session *ses;
1115 
1116         list_del(&clp->cl_lru);
1117         spin_lock(&clp->cl_lock);
1118         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1119                 list_del_init(&ses->se_hash);
1120         spin_unlock(&clp->cl_lock);
1121 }
1122 
1123 static void
1124 destroy_client(struct nfs4_client *clp)
1125 {
1126         struct nfs4_openowner *oo;
1127         struct nfs4_delegation *dp;
1128         struct list_head reaplist;
1129         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1130 
1131         INIT_LIST_HEAD(&reaplist);
1132         spin_lock(&recall_lock);
1133         while (!list_empty(&clp->cl_delegations)) {
1134                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1135                 list_del_init(&dp->dl_perclnt);
1136                 list_move(&dp->dl_recall_lru, &reaplist);
1137         }
1138         spin_unlock(&recall_lock);
1139         while (!list_empty(&reaplist)) {
1140                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1141                 destroy_delegation(dp);
1142         }
1143         while (!list_empty(&clp->cl_openowners)) {
1144                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1145                 release_openowner(oo);
1146         }
1147         nfsd4_shutdown_callback(clp);
1148         if (clp->cl_cb_conn.cb_xprt)
1149                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1150         list_del(&clp->cl_idhash);
1151         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1152                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1153         else
1154                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1155         spin_lock(&nn->client_lock);
1156         unhash_client_locked(clp);
1157         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1158         free_client(clp);
1159         spin_unlock(&nn->client_lock);
1160 }
1161 
1162 static void expire_client(struct nfs4_client *clp)
1163 {
1164         nfsd4_client_record_remove(clp);
1165         destroy_client(clp);
1166 }
1167 
1168 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1169 {
1170         memcpy(target->cl_verifier.data, source->data,
1171                         sizeof(target->cl_verifier.data));
1172 }
1173 
1174 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1175 {
1176         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1177         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1178 }
1179 
1180 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1181 {
1182         if (source->cr_principal) {
1183                 target->cr_principal =
1184                                 kstrdup(source->cr_principal, GFP_KERNEL);
1185                 if (target->cr_principal == NULL)
1186                         return -ENOMEM;
1187         } else
1188                 target->cr_principal = NULL;
1189         target->cr_flavor = source->cr_flavor;
1190         target->cr_uid = source->cr_uid;
1191         target->cr_gid = source->cr_gid;
1192         target->cr_group_info = source->cr_group_info;
1193         get_group_info(target->cr_group_info);
1194         target->cr_gss_mech = source->cr_gss_mech;
1195         if (source->cr_gss_mech)
1196                 gss_mech_get(source->cr_gss_mech);
1197         return 0;
1198 }
1199 
1200 static int
1201 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1202 {
1203         if (o1->len < o2->len)
1204                 return -1;
1205         if (o1->len > o2->len)
1206                 return 1;
1207         return memcmp(o1->data, o2->data, o1->len);
1208 }
1209 
1210 static int same_name(const char *n1, const char *n2)
1211 {
1212         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1213 }
1214 
1215 static int
1216 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1217 {
1218         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1219 }
1220 
1221 static int
1222 same_clid(clientid_t *cl1, clientid_t *cl2)
1223 {
1224         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1225 }
1226 
1227 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1228 {
1229         int i;
1230 
1231         if (g1->ngroups != g2->ngroups)
1232                 return false;
1233         for (i=0; i<g1->ngroups; i++)
1234                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1235                         return false;
1236         return true;
1237 }
1238 
1239 /*
1240  * RFC 3530 language requires clid_inuse be returned when the
1241  * "principal" associated with a requests differs from that previously
1242  * used.  We use uid, gid's, and gss principal string as our best
1243  * approximation.  We also don't want to allow non-gss use of a client
1244  * established using gss: in theory cr_principal should catch that
1245  * change, but in practice cr_principal can be null even in the gss case
1246  * since gssd doesn't always pass down a principal string.
1247  */
1248 static bool is_gss_cred(struct svc_cred *cr)
1249 {
1250         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1251         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1252 }
1253 
1254 
1255 static bool
1256 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1257 {
1258         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1259                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1260                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1261                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1262                 return false;
1263         if (cr1->cr_principal == cr2->cr_principal)
1264                 return true;
1265         if (!cr1->cr_principal || !cr2->cr_principal)
1266                 return false;
1267         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1268 }
1269 
1270 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1271 {
1272         struct svc_cred *cr = &rqstp->rq_cred;
1273         u32 service;
1274 
1275         if (!cr->cr_gss_mech)
1276                 return false;
1277         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1278         return service == RPC_GSS_SVC_INTEGRITY ||
1279                service == RPC_GSS_SVC_PRIVACY;
1280 }
1281 
1282 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1283 {
1284         struct svc_cred *cr = &rqstp->rq_cred;
1285 
1286         if (!cl->cl_mach_cred)
1287                 return true;
1288         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1289                 return false;
1290         if (!svc_rqst_integrity_protected(rqstp))
1291                 return false;
1292         if (!cr->cr_principal)
1293                 return false;
1294         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1295 }
1296 
1297 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1298 {
1299         static u32 current_clientid = 1;
1300 
1301         clp->cl_clientid.cl_boot = nn->boot_time;
1302         clp->cl_clientid.cl_id = current_clientid++; 
1303 }
1304 
1305 static void gen_confirm(struct nfs4_client *clp)
1306 {
1307         __be32 verf[2];
1308         static u32 i;
1309 
1310         verf[0] = (__be32)get_seconds();
1311         verf[1] = (__be32)i++;
1312         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1313 }
1314 
1315 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1316 {
1317         struct nfs4_stid *ret;
1318 
1319         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1320         if (!ret || !ret->sc_type)
1321                 return NULL;
1322         return ret;
1323 }
1324 
1325 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1326 {
1327         struct nfs4_stid *s;
1328 
1329         s = find_stateid(cl, t);
1330         if (!s)
1331                 return NULL;
1332         if (typemask & s->sc_type)
1333                 return s;
1334         return NULL;
1335 }
1336 
1337 static struct nfs4_client *create_client(struct xdr_netobj name,
1338                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1339 {
1340         struct nfs4_client *clp;
1341         struct sockaddr *sa = svc_addr(rqstp);
1342         int ret;
1343         struct net *net = SVC_NET(rqstp);
1344         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1345 
1346         clp = alloc_client(name);
1347         if (clp == NULL)
1348                 return NULL;
1349 
1350         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1351         if (ret) {
1352                 spin_lock(&nn->client_lock);
1353                 free_client(clp);
1354                 spin_unlock(&nn->client_lock);
1355                 return NULL;
1356         }
1357         nfsd4_init_callback(&clp->cl_cb_null);
1358         clp->cl_time = get_seconds();
1359         clear_bit(0, &clp->cl_cb_slot_busy);
1360         copy_verf(clp, verf);
1361         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1362         gen_confirm(clp);
1363         clp->cl_cb_session = NULL;
1364         clp->net = net;
1365         return clp;
1366 }
1367 
1368 static void
1369 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1370 {
1371         struct rb_node **new = &(root->rb_node), *parent = NULL;
1372         struct nfs4_client *clp;
1373 
1374         while (*new) {
1375                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1376                 parent = *new;
1377 
1378                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1379                         new = &((*new)->rb_left);
1380                 else
1381                         new = &((*new)->rb_right);
1382         }
1383 
1384         rb_link_node(&new_clp->cl_namenode, parent, new);
1385         rb_insert_color(&new_clp->cl_namenode, root);
1386 }
1387 
1388 static struct nfs4_client *
1389 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1390 {
1391         int cmp;
1392         struct rb_node *node = root->rb_node;
1393         struct nfs4_client *clp;
1394 
1395         while (node) {
1396                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1397                 cmp = compare_blob(&clp->cl_name, name);
1398                 if (cmp > 0)
1399                         node = node->rb_left;
1400                 else if (cmp < 0)
1401                         node = node->rb_right;
1402                 else
1403                         return clp;
1404         }
1405         return NULL;
1406 }
1407 
1408 static void
1409 add_to_unconfirmed(struct nfs4_client *clp)
1410 {
1411         unsigned int idhashval;
1412         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1413 
1414         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1415         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1416         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1417         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1418         renew_client(clp);
1419 }
1420 
1421 static void
1422 move_to_confirmed(struct nfs4_client *clp)
1423 {
1424         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1425         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1426 
1427         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1428         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1429         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1430         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1431         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1432         renew_client(clp);
1433 }
1434 
1435 static struct nfs4_client *
1436 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1437 {
1438         struct nfs4_client *clp;
1439         unsigned int idhashval = clientid_hashval(clid->cl_id);
1440 
1441         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1442                 if (same_clid(&clp->cl_clientid, clid)) {
1443                         if ((bool)clp->cl_minorversion != sessions)
1444                                 return NULL;
1445                         renew_client(clp);
1446                         return clp;
1447                 }
1448         }
1449         return NULL;
1450 }
1451 
1452 static struct nfs4_client *
1453 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1454 {
1455         struct list_head *tbl = nn->conf_id_hashtbl;
1456 
1457         return find_client_in_id_table(tbl, clid, sessions);
1458 }
1459 
1460 static struct nfs4_client *
1461 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1462 {
1463         struct list_head *tbl = nn->unconf_id_hashtbl;
1464 
1465         return find_client_in_id_table(tbl, clid, sessions);
1466 }
1467 
1468 static bool clp_used_exchangeid(struct nfs4_client *clp)
1469 {
1470         return clp->cl_exchange_flags != 0;
1471 } 
1472 
1473 static struct nfs4_client *
1474 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1475 {
1476         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1477 }
1478 
1479 static struct nfs4_client *
1480 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1481 {
1482         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1483 }
1484 
1485 static void
1486 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1487 {
1488         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1489         struct sockaddr *sa = svc_addr(rqstp);
1490         u32 scopeid = rpc_get_scope_id(sa);
1491         unsigned short expected_family;
1492 
1493         /* Currently, we only support tcp and tcp6 for the callback channel */
1494         if (se->se_callback_netid_len == 3 &&
1495             !memcmp(se->se_callback_netid_val, "tcp", 3))
1496                 expected_family = AF_INET;
1497         else if (se->se_callback_netid_len == 4 &&
1498                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1499                 expected_family = AF_INET6;
1500         else
1501                 goto out_err;
1502 
1503         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1504                                             se->se_callback_addr_len,
1505                                             (struct sockaddr *)&conn->cb_addr,
1506                                             sizeof(conn->cb_addr));
1507 
1508         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1509                 goto out_err;
1510 
1511         if (conn->cb_addr.ss_family == AF_INET6)
1512                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1513 
1514         conn->cb_prog = se->se_callback_prog;
1515         conn->cb_ident = se->se_callback_ident;
1516         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1517         return;
1518 out_err:
1519         conn->cb_addr.ss_family = AF_UNSPEC;
1520         conn->cb_addrlen = 0;
1521         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1522                 "will not receive delegations\n",
1523                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1524 
1525         return;
1526 }
1527 
1528 /*
1529  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1530  */
1531 void
1532 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1533 {
1534         struct nfsd4_slot *slot = resp->cstate.slot;
1535         unsigned int base;
1536 
1537         dprintk("--> %s slot %p\n", __func__, slot);
1538 
1539         slot->sl_opcnt = resp->opcnt;
1540         slot->sl_status = resp->cstate.status;
1541 
1542         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1543         if (nfsd4_not_cached(resp)) {
1544                 slot->sl_datalen = 0;
1545                 return;
1546         }
1547         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1548         base = (char *)resp->cstate.datap -
1549                                         (char *)resp->xbuf->head[0].iov_base;
1550         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1551                                     slot->sl_datalen))
1552                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1553         return;
1554 }
1555 
1556 /*
1557  * Encode the replay sequence operation from the slot values.
1558  * If cachethis is FALSE encode the uncached rep error on the next
1559  * operation which sets resp->p and increments resp->opcnt for
1560  * nfs4svc_encode_compoundres.
1561  *
1562  */
1563 static __be32
1564 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1565                           struct nfsd4_compoundres *resp)
1566 {
1567         struct nfsd4_op *op;
1568         struct nfsd4_slot *slot = resp->cstate.slot;
1569 
1570         /* Encode the replayed sequence operation */
1571         op = &args->ops[resp->opcnt - 1];
1572         nfsd4_encode_operation(resp, op);
1573 
1574         /* Return nfserr_retry_uncached_rep in next operation. */
1575         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1576                 op = &args->ops[resp->opcnt++];
1577                 op->status = nfserr_retry_uncached_rep;
1578                 nfsd4_encode_operation(resp, op);
1579         }
1580         return op->status;
1581 }
1582 
1583 /*
1584  * The sequence operation is not cached because we can use the slot and
1585  * session values.
1586  */
1587 __be32
1588 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1589                          struct nfsd4_sequence *seq)
1590 {
1591         struct nfsd4_slot *slot = resp->cstate.slot;
1592         __be32 status;
1593 
1594         dprintk("--> %s slot %p\n", __func__, slot);
1595 
1596         /* Either returns 0 or nfserr_retry_uncached */
1597         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1598         if (status == nfserr_retry_uncached_rep)
1599                 return status;
1600 
1601         /* The sequence operation has been encoded, cstate->datap set. */
1602         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1603 
1604         resp->opcnt = slot->sl_opcnt;
1605         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1606         status = slot->sl_status;
1607 
1608         return status;
1609 }
1610 
1611 /*
1612  * Set the exchange_id flags returned by the server.
1613  */
1614 static void
1615 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1616 {
1617         /* pNFS is not supported */
1618         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1619 
1620         /* Referrals are supported, Migration is not. */
1621         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1622 
1623         /* set the wire flags to return to client. */
1624         clid->flags = new->cl_exchange_flags;
1625 }
1626 
1627 static bool client_has_state(struct nfs4_client *clp)
1628 {
1629         /*
1630          * Note clp->cl_openowners check isn't quite right: there's no
1631          * need to count owners without stateid's.
1632          *
1633          * Also note we should probably be using this in 4.0 case too.
1634          */
1635         return !list_empty(&clp->cl_openowners)
1636                 || !list_empty(&clp->cl_delegations)
1637                 || !list_empty(&clp->cl_sessions);
1638 }
1639 
1640 __be32
1641 nfsd4_exchange_id(struct svc_rqst *rqstp,
1642                   struct nfsd4_compound_state *cstate,
1643                   struct nfsd4_exchange_id *exid)
1644 {
1645         struct nfs4_client *unconf, *conf, *new;
1646         __be32 status;
1647         char                    addr_str[INET6_ADDRSTRLEN];
1648         nfs4_verifier           verf = exid->verifier;
1649         struct sockaddr         *sa = svc_addr(rqstp);
1650         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1651         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1652 
1653         rpc_ntop(sa, addr_str, sizeof(addr_str));
1654         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1655                 "ip_addr=%s flags %x, spa_how %d\n",
1656                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1657                 addr_str, exid->flags, exid->spa_how);
1658 
1659         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1660                 return nfserr_inval;
1661 
1662         switch (exid->spa_how) {
1663         case SP4_MACH_CRED:
1664                 if (!svc_rqst_integrity_protected(rqstp))
1665                         return nfserr_inval;
1666         case SP4_NONE:
1667                 break;
1668         default:                                /* checked by xdr code */
1669                 WARN_ON_ONCE(1);
1670         case SP4_SSV:
1671                 return nfserr_encr_alg_unsupp;
1672         }
1673 
1674         /* Cases below refer to rfc 5661 section 18.35.4: */
1675         nfs4_lock_state();
1676         conf = find_confirmed_client_by_name(&exid->clname, nn);
1677         if (conf) {
1678                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1679                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1680 
1681                 if (update) {
1682                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1683                                 status = nfserr_inval;
1684                                 goto out;
1685                         }
1686                         if (!mach_creds_match(conf, rqstp)) {
1687                                 status = nfserr_wrong_cred;
1688                                 goto out;
1689                         }
1690                         if (!creds_match) { /* case 9 */
1691                                 status = nfserr_perm;
1692                                 goto out;
1693                         }
1694                         if (!verfs_match) { /* case 8 */
1695                                 status = nfserr_not_same;
1696                                 goto out;
1697                         }
1698                         /* case 6 */
1699                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1700                         new = conf;
1701                         goto out_copy;
1702                 }
1703                 if (!creds_match) { /* case 3 */
1704                         if (client_has_state(conf)) {
1705                                 status = nfserr_clid_inuse;
1706                                 goto out;
1707                         }
1708                         expire_client(conf);
1709                         goto out_new;
1710                 }
1711                 if (verfs_match) { /* case 2 */
1712                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1713                         new = conf;
1714                         goto out_copy;
1715                 }
1716                 /* case 5, client reboot */
1717                 goto out_new;
1718         }
1719 
1720         if (update) { /* case 7 */
1721                 status = nfserr_noent;
1722                 goto out;
1723         }
1724 
1725         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1726         if (unconf) /* case 4, possible retry or client restart */
1727                 expire_client(unconf);
1728 
1729         /* case 1 (normal case) */
1730 out_new:
1731         new = create_client(exid->clname, rqstp, &verf);
1732         if (new == NULL) {
1733                 status = nfserr_jukebox;
1734                 goto out;
1735         }
1736         new->cl_minorversion = cstate->minorversion;
1737         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1738 
1739         gen_clid(new, nn);
1740         add_to_unconfirmed(new);
1741 out_copy:
1742         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1743         exid->clientid.cl_id = new->cl_clientid.cl_id;
1744 
1745         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1746         nfsd4_set_ex_flags(new, exid);
1747 
1748         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1749                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1750         status = nfs_ok;
1751 
1752 out:
1753         nfs4_unlock_state();
1754         return status;
1755 }
1756 
1757 static __be32
1758 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1759 {
1760         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1761                 slot_seqid);
1762 
1763         /* The slot is in use, and no response has been sent. */
1764         if (slot_inuse) {
1765                 if (seqid == slot_seqid)
1766                         return nfserr_jukebox;
1767                 else
1768                         return nfserr_seq_misordered;
1769         }
1770         /* Note unsigned 32-bit arithmetic handles wraparound: */
1771         if (likely(seqid == slot_seqid + 1))
1772                 return nfs_ok;
1773         if (seqid == slot_seqid)
1774                 return nfserr_replay_cache;
1775         return nfserr_seq_misordered;
1776 }
1777 
1778 /*
1779  * Cache the create session result into the create session single DRC
1780  * slot cache by saving the xdr structure. sl_seqid has been set.
1781  * Do this for solo or embedded create session operations.
1782  */
1783 static void
1784 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1785                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1786 {
1787         slot->sl_status = nfserr;
1788         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1789 }
1790 
1791 static __be32
1792 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1793                             struct nfsd4_clid_slot *slot)
1794 {
1795         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1796         return slot->sl_status;
1797 }
1798 
1799 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1800                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1801                         1 +     /* MIN tag is length with zero, only length */ \
1802                         3 +     /* version, opcount, opcode */ \
1803                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1804                                 /* seqid, slotID, slotID, cache */ \
1805                         4 ) * sizeof(__be32))
1806 
1807 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1808                         2 +     /* verifier: AUTH_NULL, length 0 */\
1809                         1 +     /* status */ \
1810                         1 +     /* MIN tag is length with zero, only length */ \
1811                         3 +     /* opcount, opcode, opstatus*/ \
1812                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1813                                 /* seqid, slotID, slotID, slotID, status */ \
1814                         5 ) * sizeof(__be32))
1815 
1816 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1817 {
1818         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1819 
1820         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1821                 return nfserr_toosmall;
1822         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1823                 return nfserr_toosmall;
1824         ca->headerpadsz = 0;
1825         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1826         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1827         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1828         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1829                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1830         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1831         /*
1832          * Note decreasing slot size below client's request may make it
1833          * difficult for client to function correctly, whereas
1834          * decreasing the number of slots will (just?) affect
1835          * performance.  When short on memory we therefore prefer to
1836          * decrease number of slots instead of their size.  Clients that
1837          * request larger slots than they need will get poor results:
1838          */
1839         ca->maxreqs = nfsd4_get_drc_mem(ca);
1840         if (!ca->maxreqs)
1841                 return nfserr_jukebox;
1842 
1843         return nfs_ok;
1844 }
1845 
1846 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1847 {
1848         ca->headerpadsz = 0;
1849 
1850         /*
1851          * These RPC_MAX_HEADER macros are overkill, especially since we
1852          * don't even do gss on the backchannel yet.  But this is still
1853          * less than 1k.  Tighten up this estimate in the unlikely event
1854          * it turns out to be a problem for some client:
1855          */
1856         if (ca->maxreq_sz < NFS4_enc_cb_recall_sz + RPC_MAX_HEADER_WITH_AUTH)
1857                 return nfserr_toosmall;
1858         if (ca->maxresp_sz < NFS4_dec_cb_recall_sz + RPC_MAX_REPHEADER_WITH_AUTH)
1859                 return nfserr_toosmall;
1860         ca->maxresp_cached = 0;
1861         if (ca->maxops < 2)
1862                 return nfserr_toosmall;
1863 
1864         return nfs_ok;
1865 }
1866 
1867 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1868 {
1869         switch (cbs->flavor) {
1870         case RPC_AUTH_NULL:
1871         case RPC_AUTH_UNIX:
1872                 return nfs_ok;
1873         default:
1874                 /*
1875                  * GSS case: the spec doesn't allow us to return this
1876                  * error.  But it also doesn't allow us not to support
1877                  * GSS.
1878                  * I'd rather this fail hard than return some error the
1879                  * client might think it can already handle:
1880                  */
1881                 return nfserr_encr_alg_unsupp;
1882         }
1883 }
1884 
1885 __be32
1886 nfsd4_create_session(struct svc_rqst *rqstp,
1887                      struct nfsd4_compound_state *cstate,
1888                      struct nfsd4_create_session *cr_ses)
1889 {
1890         struct sockaddr *sa = svc_addr(rqstp);
1891         struct nfs4_client *conf, *unconf;
1892         struct nfsd4_session *new;
1893         struct nfsd4_conn *conn;
1894         struct nfsd4_clid_slot *cs_slot = NULL;
1895         __be32 status = 0;
1896         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1897 
1898         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1899                 return nfserr_inval;
1900         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1901         if (status)
1902                 return status;
1903         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1904         if (status)
1905                 return status;
1906         status = check_backchannel_attrs(&cr_ses->back_channel);
1907         if (status)
1908                 return status;
1909         status = nfserr_jukebox;
1910         new = alloc_session(&cr_ses->fore_channel);
1911         if (!new)
1912                 goto out_release_drc_mem;
1913         conn = alloc_conn_from_crses(rqstp, cr_ses);
1914         if (!conn)
1915                 goto out_free_session;
1916 
1917         nfs4_lock_state();
1918         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1919         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1920         WARN_ON_ONCE(conf && unconf);
1921 
1922         if (conf) {
1923                 status = nfserr_wrong_cred;
1924                 if (!mach_creds_match(conf, rqstp))
1925                         goto out_free_conn;
1926                 cs_slot = &conf->cl_cs_slot;
1927                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1928                 if (status == nfserr_replay_cache) {
1929                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1930                         goto out_free_conn;
1931                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1932                         status = nfserr_seq_misordered;
1933                         goto out_free_conn;
1934                 }
1935         } else if (unconf) {
1936                 struct nfs4_client *old;
1937                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1938                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1939                         status = nfserr_clid_inuse;
1940                         goto out_free_conn;
1941                 }
1942                 status = nfserr_wrong_cred;
1943                 if (!mach_creds_match(unconf, rqstp))
1944                         goto out_free_conn;
1945                 cs_slot = &unconf->cl_cs_slot;
1946                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1947                 if (status) {
1948                         /* an unconfirmed replay returns misordered */
1949                         status = nfserr_seq_misordered;
1950                         goto out_free_conn;
1951                 }
1952                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1953                 if (old) {
1954                         status = mark_client_expired(old);
1955                         if (status)
1956                                 goto out_free_conn;
1957                         expire_client(old);
1958                 }
1959                 move_to_confirmed(unconf);
1960                 conf = unconf;
1961         } else {
1962                 status = nfserr_stale_clientid;
1963                 goto out_free_conn;
1964         }
1965         status = nfs_ok;
1966         /*
1967          * We do not support RDMA or persistent sessions
1968          */
1969         cr_ses->flags &= ~SESSION4_PERSIST;
1970         cr_ses->flags &= ~SESSION4_RDMA;
1971 
1972         init_session(rqstp, new, conf, cr_ses);
1973         nfsd4_init_conn(rqstp, conn, new);
1974 
1975         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1976                NFS4_MAX_SESSIONID_LEN);
1977         cs_slot->sl_seqid++;
1978         cr_ses->seqid = cs_slot->sl_seqid;
1979 
1980         /* cache solo and embedded create sessions under the state lock */
1981         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1982         nfs4_unlock_state();
1983         return status;
1984 out_free_conn:
1985         nfs4_unlock_state();
1986         free_conn(conn);
1987 out_free_session:
1988         __free_session(new);
1989 out_release_drc_mem:
1990         nfsd4_put_drc_mem(&cr_ses->fore_channel);
1991         return status;
1992 }
1993 
1994 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1995 {
1996         switch (*dir) {
1997         case NFS4_CDFC4_FORE:
1998         case NFS4_CDFC4_BACK:
1999                 return nfs_ok;
2000         case NFS4_CDFC4_FORE_OR_BOTH:
2001         case NFS4_CDFC4_BACK_OR_BOTH:
2002                 *dir = NFS4_CDFC4_BOTH;
2003                 return nfs_ok;
2004         };
2005         return nfserr_inval;
2006 }
2007 
2008 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2009 {
2010         struct nfsd4_session *session = cstate->session;
2011         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2012         __be32 status;
2013 
2014         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2015         if (status)
2016                 return status;
2017         spin_lock(&nn->client_lock);
2018         session->se_cb_prog = bc->bc_cb_program;
2019         session->se_cb_sec = bc->bc_cb_sec;
2020         spin_unlock(&nn->client_lock);
2021 
2022         nfsd4_probe_callback(session->se_client);
2023 
2024         return nfs_ok;
2025 }
2026 
2027 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2028                      struct nfsd4_compound_state *cstate,
2029                      struct nfsd4_bind_conn_to_session *bcts)
2030 {
2031         __be32 status;
2032         struct nfsd4_conn *conn;
2033         struct nfsd4_session *session;
2034         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2035 
2036         if (!nfsd4_last_compound_op(rqstp))
2037                 return nfserr_not_only_op;
2038         nfs4_lock_state();
2039         spin_lock(&nn->client_lock);
2040         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2041         spin_unlock(&nn->client_lock);
2042         status = nfserr_badsession;
2043         if (!session)
2044                 goto out;
2045         status = nfserr_wrong_cred;
2046         if (!mach_creds_match(session->se_client, rqstp))
2047                 goto out;
2048         status = nfsd4_map_bcts_dir(&bcts->dir);
2049         if (status)
2050                 goto out;
2051         conn = alloc_conn(rqstp, bcts->dir);
2052         status = nfserr_jukebox;
2053         if (!conn)
2054                 goto out;
2055         nfsd4_init_conn(rqstp, conn, session);
2056         status = nfs_ok;
2057 out:
2058         nfs4_unlock_state();
2059         return status;
2060 }
2061 
2062 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2063 {
2064         if (!session)
2065                 return 0;
2066         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2067 }
2068 
2069 __be32
2070 nfsd4_destroy_session(struct svc_rqst *r,
2071                       struct nfsd4_compound_state *cstate,
2072                       struct nfsd4_destroy_session *sessionid)
2073 {
2074         struct nfsd4_session *ses;
2075         __be32 status;
2076         int ref_held_by_me = 0;
2077         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2078 
2079         nfs4_lock_state();
2080         status = nfserr_not_only_op;
2081         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2082                 if (!nfsd4_last_compound_op(r))
2083                         goto out;
2084                 ref_held_by_me++;
2085         }
2086         dump_sessionid(__func__, &sessionid->sessionid);
2087         spin_lock(&nn->client_lock);
2088         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2089         status = nfserr_badsession;
2090         if (!ses)
2091                 goto out_client_lock;
2092         status = nfserr_wrong_cred;
2093         if (!mach_creds_match(ses->se_client, r))
2094                 goto out_client_lock;
2095         nfsd4_get_session_locked(ses);
2096         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2097         if (status)
2098                 goto out_put_session;
2099         unhash_session(ses);
2100         spin_unlock(&nn->client_lock);
2101 
2102         nfsd4_probe_callback_sync(ses->se_client);
2103 
2104         spin_lock(&nn->client_lock);
2105         status = nfs_ok;
2106 out_put_session:
2107         nfsd4_put_session(ses);
2108 out_client_lock:
2109         spin_unlock(&nn->client_lock);
2110 out:
2111         nfs4_unlock_state();
2112         return status;
2113 }
2114 
2115 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2116 {
2117         struct nfsd4_conn *c;
2118 
2119         list_for_each_entry(c, &s->se_conns, cn_persession) {
2120                 if (c->cn_xprt == xpt) {
2121                         return c;
2122                 }
2123         }
2124         return NULL;
2125 }
2126 
2127 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2128 {
2129         struct nfs4_client *clp = ses->se_client;
2130         struct nfsd4_conn *c;
2131         __be32 status = nfs_ok;
2132         int ret;
2133 
2134         spin_lock(&clp->cl_lock);
2135         c = __nfsd4_find_conn(new->cn_xprt, ses);
2136         if (c)
2137                 goto out_free;
2138         status = nfserr_conn_not_bound_to_session;
2139         if (clp->cl_mach_cred)
2140                 goto out_free;
2141         __nfsd4_hash_conn(new, ses);
2142         spin_unlock(&clp->cl_lock);
2143         ret = nfsd4_register_conn(new);
2144         if (ret)
2145                 /* oops; xprt is already down: */
2146                 nfsd4_conn_lost(&new->cn_xpt_user);
2147         return nfs_ok;
2148 out_free:
2149         spin_unlock(&clp->cl_lock);
2150         free_conn(new);
2151         return status;
2152 }
2153 
2154 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2155 {
2156         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2157 
2158         return args->opcnt > session->se_fchannel.maxops;
2159 }
2160 
2161 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2162                                   struct nfsd4_session *session)
2163 {
2164         struct xdr_buf *xb = &rqstp->rq_arg;
2165 
2166         return xb->len > session->se_fchannel.maxreq_sz;
2167 }
2168 
2169 __be32
2170 nfsd4_sequence(struct svc_rqst *rqstp,
2171                struct nfsd4_compound_state *cstate,
2172                struct nfsd4_sequence *seq)
2173 {
2174         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2175         struct nfsd4_session *session;
2176         struct nfs4_client *clp;
2177         struct nfsd4_slot *slot;
2178         struct nfsd4_conn *conn;
2179         __be32 status;
2180         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2181 
2182         if (resp->opcnt != 1)
2183                 return nfserr_sequence_pos;
2184 
2185         /*
2186          * Will be either used or freed by nfsd4_sequence_check_conn
2187          * below.
2188          */
2189         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2190         if (!conn)
2191                 return nfserr_jukebox;
2192 
2193         spin_lock(&nn->client_lock);
2194         status = nfserr_badsession;
2195         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2196         if (!session)
2197                 goto out_no_session;
2198         clp = session->se_client;
2199         status = get_client_locked(clp);
2200         if (status)
2201                 goto out_no_session;
2202         status = nfsd4_get_session_locked(session);
2203         if (status)
2204                 goto out_put_client;
2205 
2206         status = nfserr_too_many_ops;
2207         if (nfsd4_session_too_many_ops(rqstp, session))
2208                 goto out_put_session;
2209 
2210         status = nfserr_req_too_big;
2211         if (nfsd4_request_too_big(rqstp, session))
2212                 goto out_put_session;
2213 
2214         status = nfserr_badslot;
2215         if (seq->slotid >= session->se_fchannel.maxreqs)
2216                 goto out_put_session;
2217 
2218         slot = session->se_slots[seq->slotid];
2219         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2220 
2221         /* We do not negotiate the number of slots yet, so set the
2222          * maxslots to the session maxreqs which is used to encode
2223          * sr_highest_slotid and the sr_target_slot id to maxslots */
2224         seq->maxslots = session->se_fchannel.maxreqs;
2225 
2226         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2227                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2228         if (status == nfserr_replay_cache) {
2229                 status = nfserr_seq_misordered;
2230                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2231                         goto out_put_session;
2232                 cstate->slot = slot;
2233                 cstate->session = session;
2234                 /* Return the cached reply status and set cstate->status
2235                  * for nfsd4_proc_compound processing */
2236                 status = nfsd4_replay_cache_entry(resp, seq);
2237                 cstate->status = nfserr_replay_cache;
2238                 goto out;
2239         }
2240         if (status)
2241                 goto out_put_session;
2242 
2243         status = nfsd4_sequence_check_conn(conn, session);
2244         conn = NULL;
2245         if (status)
2246                 goto out_put_session;
2247 
2248         /* Success! bump slot seqid */
2249         slot->sl_seqid = seq->seqid;
2250         slot->sl_flags |= NFSD4_SLOT_INUSE;
2251         if (seq->cachethis)
2252                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2253         else
2254                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2255 
2256         cstate->slot = slot;
2257         cstate->session = session;
2258 
2259 out:
2260         switch (clp->cl_cb_state) {
2261         case NFSD4_CB_DOWN:
2262                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2263                 break;
2264         case NFSD4_CB_FAULT:
2265                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2266                 break;
2267         default:
2268                 seq->status_flags = 0;
2269         }
2270         if (!list_empty(&clp->cl_revoked))
2271                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2272 out_no_session:
2273         if (conn)
2274                 free_conn(conn);
2275         spin_unlock(&nn->client_lock);
2276         return status;
2277 out_put_session:
2278         nfsd4_put_session(session);
2279 out_put_client:
2280         put_client_renew_locked(clp);
2281         goto out_no_session;
2282 }
2283 
2284 __be32
2285 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2286 {
2287         struct nfs4_client *conf, *unconf, *clp;
2288         __be32 status = 0;
2289         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2290 
2291         nfs4_lock_state();
2292         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2293         conf = find_confirmed_client(&dc->clientid, true, nn);
2294         WARN_ON_ONCE(conf && unconf);
2295 
2296         if (conf) {
2297                 clp = conf;
2298 
2299                 if (client_has_state(conf)) {
2300                         status = nfserr_clientid_busy;
2301                         goto out;
2302                 }
2303         } else if (unconf)
2304                 clp = unconf;
2305         else {
2306                 status = nfserr_stale_clientid;
2307                 goto out;
2308         }
2309         if (!mach_creds_match(clp, rqstp)) {
2310                 status = nfserr_wrong_cred;
2311                 goto out;
2312         }
2313         expire_client(clp);
2314 out:
2315         nfs4_unlock_state();
2316         return status;
2317 }
2318 
2319 __be32
2320 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2321 {
2322         __be32 status = 0;
2323 
2324         if (rc->rca_one_fs) {
2325                 if (!cstate->current_fh.fh_dentry)
2326                         return nfserr_nofilehandle;
2327                 /*
2328                  * We don't take advantage of the rca_one_fs case.
2329                  * That's OK, it's optional, we can safely ignore it.
2330                  */
2331                  return nfs_ok;
2332         }
2333 
2334         nfs4_lock_state();
2335         status = nfserr_complete_already;
2336         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2337                              &cstate->session->se_client->cl_flags))
2338                 goto out;
2339 
2340         status = nfserr_stale_clientid;
2341         if (is_client_expired(cstate->session->se_client))
2342                 /*
2343                  * The following error isn't really legal.
2344                  * But we only get here if the client just explicitly
2345                  * destroyed the client.  Surely it no longer cares what
2346                  * error it gets back on an operation for the dead
2347                  * client.
2348                  */
2349                 goto out;
2350 
2351         status = nfs_ok;
2352         nfsd4_client_record_create(cstate->session->se_client);
2353 out:
2354         nfs4_unlock_state();
2355         return status;
2356 }
2357 
2358 __be32
2359 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2360                   struct nfsd4_setclientid *setclid)
2361 {
2362         struct xdr_netobj       clname = setclid->se_name;
2363         nfs4_verifier           clverifier = setclid->se_verf;
2364         struct nfs4_client      *conf, *unconf, *new;
2365         __be32                  status;
2366         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2367 
2368         /* Cases below refer to rfc 3530 section 14.2.33: */
2369         nfs4_lock_state();
2370         conf = find_confirmed_client_by_name(&clname, nn);
2371         if (conf) {
2372                 /* case 0: */
2373                 status = nfserr_clid_inuse;
2374                 if (clp_used_exchangeid(conf))
2375                         goto out;
2376                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2377                         char addr_str[INET6_ADDRSTRLEN];
2378                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2379                                  sizeof(addr_str));
2380                         dprintk("NFSD: setclientid: string in use by client "
2381                                 "at %s\n", addr_str);
2382                         goto out;
2383                 }
2384         }
2385         unconf = find_unconfirmed_client_by_name(&clname, nn);
2386         if (unconf)
2387                 expire_client(unconf);
2388         status = nfserr_jukebox;
2389         new = create_client(clname, rqstp, &clverifier);
2390         if (new == NULL)
2391                 goto out;
2392         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2393                 /* case 1: probable callback update */
2394                 copy_clid(new, conf);
2395         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2396                 gen_clid(new, nn);
2397         new->cl_minorversion = 0;
2398         gen_callback(new, setclid, rqstp);
2399         add_to_unconfirmed(new);
2400         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2401         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2402         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2403         status = nfs_ok;
2404 out:
2405         nfs4_unlock_state();
2406         return status;
2407 }
2408 
2409 
2410 __be32
2411 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2412                          struct nfsd4_compound_state *cstate,
2413                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2414 {
2415         struct nfs4_client *conf, *unconf;
2416         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
2417         clientid_t * clid = &setclientid_confirm->sc_clientid;
2418         __be32 status;
2419         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2420 
2421         if (STALE_CLIENTID(clid, nn))
2422                 return nfserr_stale_clientid;
2423         nfs4_lock_state();
2424 
2425         conf = find_confirmed_client(clid, false, nn);
2426         unconf = find_unconfirmed_client(clid, false, nn);
2427         /*
2428          * We try hard to give out unique clientid's, so if we get an
2429          * attempt to confirm the same clientid with a different cred,
2430          * there's a bug somewhere.  Let's charitably assume it's our
2431          * bug.
2432          */
2433         status = nfserr_serverfault;
2434         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2435                 goto out;
2436         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2437                 goto out;
2438         /* cases below refer to rfc 3530 section 14.2.34: */
2439         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2440                 if (conf && !unconf) /* case 2: probable retransmit */
2441                         status = nfs_ok;
2442                 else /* case 4: client hasn't noticed we rebooted yet? */
2443                         status = nfserr_stale_clientid;
2444                 goto out;
2445         }
2446         status = nfs_ok;
2447         if (conf) { /* case 1: callback update */
2448                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2449                 nfsd4_probe_callback(conf);
2450                 expire_client(unconf);
2451         } else { /* case 3: normal case; new or rebooted client */
2452                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2453                 if (conf) {
2454                         status = mark_client_expired(conf);
2455                         if (status)
2456                                 goto out;
2457                         expire_client(conf);
2458                 }
2459                 move_to_confirmed(unconf);
2460                 nfsd4_probe_callback(unconf);
2461         }
2462 out:
2463         nfs4_unlock_state();
2464         return status;
2465 }
2466 
2467 static struct nfs4_file *nfsd4_alloc_file(void)
2468 {
2469         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2470 }
2471 
2472 /* OPEN Share state helper functions */
2473 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2474 {
2475         unsigned int hashval = file_hashval(ino);
2476 
2477         atomic_set(&fp->fi_ref, 1);
2478         INIT_LIST_HEAD(&fp->fi_stateids);
2479         INIT_LIST_HEAD(&fp->fi_delegations);
2480         fp->fi_inode = igrab(ino);
2481         fp->fi_had_conflict = false;
2482         fp->fi_lease = NULL;
2483         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2484         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2485         spin_lock(&recall_lock);
2486         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2487         spin_unlock(&recall_lock);
2488 }
2489 
2490 static void
2491 nfsd4_free_slab(struct kmem_cache **slab)
2492 {
2493         if (*slab == NULL)
2494                 return;
2495         kmem_cache_destroy(*slab);
2496         *slab = NULL;
2497 }
2498 
2499 void
2500 nfsd4_free_slabs(void)
2501 {
2502         nfsd4_free_slab(&openowner_slab);
2503         nfsd4_free_slab(&lockowner_slab);
2504         nfsd4_free_slab(&file_slab);
2505         nfsd4_free_slab(&stateid_slab);
2506         nfsd4_free_slab(&deleg_slab);
2507 }
2508 
2509 int
2510 nfsd4_init_slabs(void)
2511 {
2512         openowner_slab = kmem_cache_create("nfsd4_openowners",
2513                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2514         if (openowner_slab == NULL)
2515                 goto out_nomem;
2516         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2517                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2518         if (lockowner_slab == NULL)
2519                 goto out_nomem;
2520         file_slab = kmem_cache_create("nfsd4_files",
2521                         sizeof(struct nfs4_file), 0, 0, NULL);
2522         if (file_slab == NULL)
2523                 goto out_nomem;
2524         stateid_slab = kmem_cache_create("nfsd4_stateids",
2525                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2526         if (stateid_slab == NULL)
2527                 goto out_nomem;
2528         deleg_slab = kmem_cache_create("nfsd4_delegations",
2529                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2530         if (deleg_slab == NULL)
2531                 goto out_nomem;
2532         return 0;
2533 out_nomem:
2534         nfsd4_free_slabs();
2535         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2536         return -ENOMEM;
2537 }
2538 
2539 void nfs4_free_openowner(struct nfs4_openowner *oo)
2540 {
2541         kfree(oo->oo_owner.so_owner.data);
2542         kmem_cache_free(openowner_slab, oo);
2543 }
2544 
2545 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2546 {
2547         kfree(lo->lo_owner.so_owner.data);
2548         kmem_cache_free(lockowner_slab, lo);
2549 }
2550 
2551 static void init_nfs4_replay(struct nfs4_replay *rp)
2552 {
2553         rp->rp_status = nfserr_serverfault;
2554         rp->rp_buflen = 0;
2555         rp->rp_buf = rp->rp_ibuf;
2556 }
2557 
2558 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2559 {
2560         struct nfs4_stateowner *sop;
2561 
2562         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2563         if (!sop)
2564                 return NULL;
2565 
2566         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2567         if (!sop->so_owner.data) {
2568                 kmem_cache_free(slab, sop);
2569                 return NULL;
2570         }
2571         sop->so_owner.len = owner->len;
2572 
2573         INIT_LIST_HEAD(&sop->so_stateids);
2574         sop->so_client = clp;
2575         init_nfs4_replay(&sop->so_replay);
2576         return sop;
2577 }
2578 
2579 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2580 {
2581         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2582 
2583         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2584         list_add(&oo->oo_perclient, &clp->cl_openowners);
2585 }
2586 
2587 static struct nfs4_openowner *
2588 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2589         struct nfs4_openowner *oo;
2590 
2591         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2592         if (!oo)
2593                 return NULL;
2594         oo->oo_owner.so_is_open_owner = 1;
2595         oo->oo_owner.so_seqid = open->op_seqid;
2596         oo->oo_flags = NFS4_OO_NEW;
2597         oo->oo_time = 0;
2598         oo->oo_last_closed_stid = NULL;
2599         INIT_LIST_HEAD(&oo->oo_close_lru);
2600         hash_openowner(oo, clp, strhashval);
2601         return oo;
2602 }
2603 
2604 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2605         struct nfs4_openowner *oo = open->op_openowner;
2606 
2607         stp->st_stid.sc_type = NFS4_OPEN_STID;
2608         INIT_LIST_HEAD(&stp->st_lockowners);
2609         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2610         list_add(&stp->st_perfile, &fp->fi_stateids);
2611         stp->st_stateowner = &oo->oo_owner;
2612         get_nfs4_file(fp);
2613         stp->st_file = fp;
2614         stp->st_access_bmap = 0;
2615         stp->st_deny_bmap = 0;
2616         set_access(open->op_share_access, stp);
2617         set_deny(open->op_share_deny, stp);
2618         stp->st_openstp = NULL;
2619 }
2620 
2621 static void
2622 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2623 {
2624         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2625 
2626         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2627 
2628         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2629         oo->oo_time = get_seconds();
2630 }
2631 
2632 static int
2633 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2634                                                         clientid_t *clid)
2635 {
2636         return (sop->so_owner.len == owner->len) &&
2637                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2638                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2639 }
2640 
2641 static struct nfs4_openowner *
2642 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2643                         bool sessions, struct nfsd_net *nn)
2644 {
2645         struct nfs4_stateowner *so;
2646         struct nfs4_openowner *oo;
2647         struct nfs4_client *clp;
2648 
2649         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2650                 if (!so->so_is_open_owner)
2651                         continue;
2652                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2653                         oo = openowner(so);
2654                         clp = oo->oo_owner.so_client;
2655                         if ((bool)clp->cl_minorversion != sessions)
2656                                 return NULL;
2657                         renew_client(oo->oo_owner.so_client);
2658                         return oo;
2659                 }
2660         }
2661         return NULL;
2662 }
2663 
2664 /* search file_hashtbl[] for file */
2665 static struct nfs4_file *
2666 find_file(struct inode *ino)
2667 {
2668         unsigned int hashval = file_hashval(ino);
2669         struct nfs4_file *fp;
2670 
2671         spin_lock(&recall_lock);
2672         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2673                 if (fp->fi_inode == ino) {
2674                         get_nfs4_file(fp);
2675                         spin_unlock(&recall_lock);
2676                         return fp;
2677                 }
2678         }
2679         spin_unlock(&recall_lock);
2680         return NULL;
2681 }
2682 
2683 /*
2684  * Called to check deny when READ with all zero stateid or
2685  * WRITE with all zero or all one stateid
2686  */
2687 static __be32
2688 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2689 {
2690         struct inode *ino = current_fh->fh_dentry->d_inode;
2691         struct nfs4_file *fp;
2692         struct nfs4_ol_stateid *stp;
2693         __be32 ret;
2694 
2695         fp = find_file(ino);
2696         if (!fp)
2697                 return nfs_ok;
2698         ret = nfserr_locked;
2699         /* Search for conflicting share reservations */
2700         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2701                 if (test_deny(deny_type, stp) ||
2702                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2703                         goto out;
2704         }
2705         ret = nfs_ok;
2706 out:
2707         put_nfs4_file(fp);
2708         return ret;
2709 }
2710 
2711 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2712 {
2713         struct nfs4_client *clp = dp->dl_stid.sc_client;
2714         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2715 
2716         /* We're assuming the state code never drops its reference
2717          * without first removing the lease.  Since we're in this lease
2718          * callback (and since the lease code is serialized by the kernel
2719          * lock) we know the server hasn't removed the lease yet, we know
2720          * it's safe to take a reference: */
2721         atomic_inc(&dp->dl_count);
2722 
2723         list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2724 
2725         /* Only place dl_time is set; protected by i_lock: */
2726         dp->dl_time = get_seconds();
2727 
2728         nfsd4_cb_recall(dp);
2729 }
2730 
2731 /* Called from break_lease() with i_lock held. */
2732 static void nfsd_break_deleg_cb(struct file_lock *fl)
2733 {
2734         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2735         struct nfs4_delegation *dp;
2736 
2737         if (!fp) {
2738                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2739                 return;
2740         }
2741         if (fp->fi_had_conflict) {
2742                 WARN(1, "duplicate break on %p\n", fp);
2743                 return;
2744         }
2745         /*
2746          * We don't want the locks code to timeout the lease for us;
2747          * we'll remove it ourself if a delegation isn't returned
2748          * in time:
2749          */
2750         fl->fl_break_time = 0;
2751 
2752         spin_lock(&recall_lock);
2753         fp->fi_had_conflict = true;
2754         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2755                 nfsd_break_one_deleg(dp);
2756         spin_unlock(&recall_lock);
2757 }
2758 
2759 static
2760 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2761 {
2762         if (arg & F_UNLCK)
2763                 return lease_modify(onlist, arg);
2764         else
2765                 return -EAGAIN;
2766 }
2767 
2768 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2769         .lm_break = nfsd_break_deleg_cb,
2770         .lm_change = nfsd_change_deleg_cb,
2771 };
2772 
2773 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2774 {
2775         if (nfsd4_has_session(cstate))
2776                 return nfs_ok;
2777         if (seqid == so->so_seqid - 1)
2778                 return nfserr_replay_me;
2779         if (seqid == so->so_seqid)
2780                 return nfs_ok;
2781         return nfserr_bad_seqid;
2782 }
2783 
2784 __be32
2785 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2786                     struct nfsd4_open *open, struct nfsd_net *nn)
2787 {
2788         clientid_t *clientid = &open->op_clientid;
2789         struct nfs4_client *clp = NULL;
2790         unsigned int strhashval;
2791         struct nfs4_openowner *oo = NULL;
2792         __be32 status;
2793 
2794         if (STALE_CLIENTID(&open->op_clientid, nn))
2795                 return nfserr_stale_clientid;
2796         /*
2797          * In case we need it later, after we've already created the
2798          * file and don't want to risk a further failure:
2799          */
2800         open->op_file = nfsd4_alloc_file();
2801         if (open->op_file == NULL)
2802                 return nfserr_jukebox;
2803 
2804         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2805         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2806         open->op_openowner = oo;
2807         if (!oo) {
2808                 clp = find_confirmed_client(clientid, cstate->minorversion,
2809                                             nn);
2810                 if (clp == NULL)
2811                         return nfserr_expired;
2812                 goto new_owner;
2813         }
2814         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2815                 /* Replace unconfirmed owners without checking for replay. */
2816                 clp = oo->oo_owner.so_client;
2817                 release_openowner(oo);
2818                 open->op_openowner = NULL;
2819                 goto new_owner;
2820         }
2821         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2822         if (status)
2823                 return status;
2824         clp = oo->oo_owner.so_client;
2825         goto alloc_stateid;
2826 new_owner:
2827         oo = alloc_init_open_stateowner(strhashval, clp, open);
2828         if (oo == NULL)
2829                 return nfserr_jukebox;
2830         open->op_openowner = oo;
2831 alloc_stateid:
2832         open->op_stp = nfs4_alloc_stateid(clp);
2833         if (!open->op_stp)
2834                 return nfserr_jukebox;
2835         return nfs_ok;
2836 }
2837 
2838 static inline __be32
2839 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2840 {
2841         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2842                 return nfserr_openmode;
2843         else
2844                 return nfs_ok;
2845 }
2846 
2847 static int share_access_to_flags(u32 share_access)
2848 {
2849         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2850 }
2851 
2852 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2853 {
2854         struct nfs4_stid *ret;
2855 
2856         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2857         if (!ret)
2858                 return NULL;
2859         return delegstateid(ret);
2860 }
2861 
2862 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2863 {
2864         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2865                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2866 }
2867 
2868 static __be32
2869 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2870                 struct nfs4_delegation **dp)
2871 {
2872         int flags;
2873         __be32 status = nfserr_bad_stateid;
2874 
2875         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2876         if (*dp == NULL)
2877                 goto out;
2878         flags = share_access_to_flags(open->op_share_access);
2879         status = nfs4_check_delegmode(*dp, flags);
2880         if (status)
2881                 *dp = NULL;
2882 out:
2883         if (!nfsd4_is_deleg_cur(open))
2884                 return nfs_ok;
2885         if (status)
2886                 return status;
2887         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2888         return nfs_ok;
2889 }
2890 
2891 static __be32
2892 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2893 {
2894         struct nfs4_ol_stateid *local;
2895         struct nfs4_openowner *oo = open->op_openowner;
2896 
2897         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2898                 /* ignore lock owners */
2899                 if (local->st_stateowner->so_is_open_owner == 0)
2900                         continue;
2901                 /* remember if we have seen this open owner */
2902                 if (local->st_stateowner == &oo->oo_owner)
2903                         *stpp = local;
2904                 /* check for conflicting share reservations */
2905                 if (!test_share(local, open))
2906                         return nfserr_share_denied;
2907         }
2908         return nfs_ok;
2909 }
2910 
2911 static inline int nfs4_access_to_access(u32 nfs4_access)
2912 {
2913         int flags = 0;
2914 
2915         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2916                 flags |= NFSD_MAY_READ;
2917         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2918                 flags |= NFSD_MAY_WRITE;
2919         return flags;
2920 }
2921 
2922 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2923                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2924 {
2925         __be32 status;
2926         int oflag = nfs4_access_to_omode(open->op_share_access);
2927         int access = nfs4_access_to_access(open->op_share_access);
2928 
2929         if (!fp->fi_fds[oflag]) {
2930                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2931                         &fp->fi_fds[oflag]);
2932                 if (status)
2933                         return status;
2934         }
2935         nfs4_file_get_access(fp, oflag);
2936 
2937         return nfs_ok;
2938 }
2939 
2940 static inline __be32
2941 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2942                 struct nfsd4_open *open)
2943 {
2944         struct iattr iattr = {
2945                 .ia_valid = ATTR_SIZE,
2946                 .ia_size = 0,
2947         };
2948         if (!open->op_truncate)
2949                 return 0;
2950         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2951                 return nfserr_inval;
2952         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2953 }
2954 
2955 static __be32
2956 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)
2957 {
2958         u32 op_share_access = open->op_share_access;
2959         bool new_access;
2960         __be32 status;
2961 
2962         new_access = !test_access(op_share_access, stp);
2963         if (new_access) {
2964                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2965                 if (status)
2966                         return status;
2967         }
2968         status = nfsd4_truncate(rqstp, cur_fh, open);
2969         if (status) {
2970                 if (new_access) {
2971                         int oflag = nfs4_access_to_omode(op_share_access);
2972                         nfs4_file_put_access(fp, oflag);
2973                 }
2974                 return status;
2975         }
2976         /* remember the open */
2977         set_access(op_share_access, stp);
2978         set_deny(open->op_share_deny, stp);
2979 
2980         return nfs_ok;
2981 }
2982 
2983 
2984 static void
2985 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2986 {
2987         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2988 }
2989 
2990 /* Should we give out recallable state?: */
2991 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2992 {
2993         if (clp->cl_cb_state == NFSD4_CB_UP)
2994                 return true;
2995         /*
2996          * In the sessions case, since we don't have to establish a
2997          * separate connection for callbacks, we assume it's OK
2998          * until we hear otherwise:
2999          */
3000         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3001 }
3002 
3003 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3004 {
3005         struct file_lock *fl;
3006 
3007         fl = locks_alloc_lock();
3008         if (!fl)
3009                 return NULL;
3010         locks_init_lock(fl);
3011         fl->fl_lmops = &nfsd_lease_mng_ops;
3012         fl->fl_flags = FL_LEASE;
3013         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3014         fl->fl_end = OFFSET_MAX;
3015         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3016         fl->fl_pid = current->tgid;
3017         return fl;
3018 }
3019 
3020 static int nfs4_setlease(struct nfs4_delegation *dp)
3021 {
3022         struct nfs4_file *fp = dp->dl_file;
3023         struct file_lock *fl;
3024         int status;
3025 
3026         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3027         if (!fl)
3028                 return -ENOMEM;
3029         fl->fl_file = find_readable_file(fp);
3030         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3031         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3032         if (status) {
3033                 list_del_init(&dp->dl_perclnt);
3034                 locks_free_lock(fl);
3035                 return status;
3036         }
3037         fp->fi_lease = fl;
3038         fp->fi_deleg_file = get_file(fl->fl_file);
3039         atomic_set(&fp->fi_delegees, 1);
3040         list_add(&dp->dl_perfile, &fp->fi_delegations);
3041         return 0;
3042 }
3043 
3044 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3045 {
3046         int status;
3047 
3048         if (fp->fi_had_conflict)
3049                 return -EAGAIN;
3050         get_nfs4_file(fp);
3051         dp->dl_file = fp;
3052         if (!fp->fi_lease) {
3053                 status = nfs4_setlease(dp);
3054                 if (status)
3055                         goto out_free;
3056                 return 0;
3057         }
3058         spin_lock(&recall_lock);
3059         if (fp->fi_had_conflict) {
3060                 spin_unlock(&recall_lock);
3061                 status = -EAGAIN;
3062                 goto out_free;
3063         }
3064         atomic_inc(&fp->fi_delegees);
3065         list_add(&dp->dl_perfile, &fp->fi_delegations);
3066         spin_unlock(&recall_lock);
3067         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3068         return 0;
3069 out_free:
3070         put_nfs4_file(fp);
3071         dp->dl_file = fp;
3072         return status;
3073 }
3074 
3075 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3076 {
3077         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3078         if (status == -EAGAIN)
3079                 open->op_why_no_deleg = WND4_CONTENTION;
3080         else {
3081                 open->op_why_no_deleg = WND4_RESOURCE;
3082                 switch (open->op_deleg_want) {
3083                 case NFS4_SHARE_WANT_READ_DELEG:
3084                 case NFS4_SHARE_WANT_WRITE_DELEG:
3085                 case NFS4_SHARE_WANT_ANY_DELEG:
3086                         break;
3087                 case NFS4_SHARE_WANT_CANCEL:
3088                         open->op_why_no_deleg = WND4_CANCELLED;
3089                         break;
3090                 case NFS4_SHARE_WANT_NO_DELEG:
3091                         WARN_ON_ONCE(1);
3092                 }
3093         }
3094 }
3095 
3096 /*
3097  * Attempt to hand out a delegation.
3098  *
3099  * Note we don't support write delegations, and won't until the vfs has
3100  * proper support for them.
3101  */
3102 static void
3103 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3104                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3105 {
3106         struct nfs4_delegation *dp;
3107         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3108         int cb_up;
3109         int status = 0;
3110 
3111         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3112         open->op_recall = 0;
3113         switch (open->op_claim_type) {
3114                 case NFS4_OPEN_CLAIM_PREVIOUS:
3115                         if (!cb_up)
3116                                 open->op_recall = 1;
3117                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3118                                 goto out_no_deleg;
3119                         break;
3120                 case NFS4_OPEN_CLAIM_NULL:
3121                         /*
3122                          * Let's not give out any delegations till everyone's
3123                          * had the chance to reclaim theirs....
3124                          */
3125                         if (locks_in_grace(net))
3126                                 goto out_no_deleg;
3127                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3128                                 goto out_no_deleg;
3129                         /*
3130                          * Also, if the file was opened for write or
3131                          * create, there's a good chance the client's
3132                          * about to write to it, resulting in an
3133                          * immediate recall (since we don't support
3134                          * write delegations):
3135                          */
3136                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3137                                 goto out_no_deleg;
3138                         if (open->op_create == NFS4_OPEN_CREATE)
3139                                 goto out_no_deleg;
3140                         break;
3141                 default:
3142                         goto out_no_deleg;
3143         }
3144         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3145         if (dp == NULL)
3146                 goto out_no_deleg;
3147         status = nfs4_set_delegation(dp, stp->st_file);
3148         if (status)
3149                 goto out_free;
3150 
3151         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3152 
3153         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3154                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3155         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3156         return;
3157 out_free:
3158         unhash_stid(&dp->dl_stid);
3159         nfs4_put_delegation(dp);
3160 out_no_deleg:
3161         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3162         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3163             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3164                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3165                 open->op_recall = 1;
3166         }
3167 
3168         /* 4.1 client asking for a delegation? */
3169         if (open->op_deleg_want)
3170                 nfsd4_open_deleg_none_ext(open, status);
3171         return;
3172 }
3173 
3174 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3175                                         struct nfs4_delegation *dp)
3176 {
3177         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3178             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3179                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3180                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3181         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3182                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3183                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3184                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3185         }
3186         /* Otherwise the client must be confused wanting a delegation
3187          * it already has, therefore we don't return
3188          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3189          */
3190 }
3191 
3192 /*
3193  * called with nfs4_lock_state() held.
3194  */
3195 __be32
3196 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3197 {
3198         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3199         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3200         struct nfs4_file *fp = NULL;
3201         struct inode *ino = current_fh->fh_dentry->d_inode;
3202         struct nfs4_ol_stateid *stp = NULL;
3203         struct nfs4_delegation *dp = NULL;
3204         __be32 status;
3205 
3206         /*
3207          * Lookup file; if found, lookup stateid and check open request,
3208          * and check for delegations in the process of being recalled.
3209          * If not found, create the nfs4_file struct
3210          */
3211         fp = find_file(ino);
3212         if (fp) {
3213                 if ((status = nfs4_check_open(fp, open, &stp)))
3214                         goto out;
3215                 status = nfs4_check_deleg(cl, open, &dp);
3216                 if (status)
3217                         goto out;
3218         } else {
3219                 status = nfserr_bad_stateid;
3220                 if (nfsd4_is_deleg_cur(open))
3221                         goto out;
3222                 status = nfserr_jukebox;
3223                 fp = open->op_file;
3224                 open->op_file = NULL;
3225                 nfsd4_init_file(fp, ino);
3226         }
3227 
3228         /*
3229          * OPEN the file, or upgrade an existing OPEN.
3230          * If truncate fails, the OPEN fails.
3231          */
3232         if (stp) {
3233                 /* Stateid was found, this is an OPEN upgrade */
3234                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3235                 if (status)
3236                         goto out;
3237         } else {
3238                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3239                 if (status)
3240                         goto out;
3241                 status = nfsd4_truncate(rqstp, current_fh, open);
3242                 if (status)
3243                         goto out;
3244                 stp = open->op_stp;
3245                 open->op_stp = NULL;
3246                 init_open_stateid(stp, fp, open);
3247         }
3248         update_stateid(&stp->st_stid.sc_stateid);
3249         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3250 
3251         if (nfsd4_has_session(&resp->cstate)) {
3252                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3253 
3254                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3255                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3256                         open->op_why_no_deleg = WND4_NOT_WANTED;
3257                         goto nodeleg;
3258                 }
3259         }
3260 
3261         /*
3262         * Attempt to hand out a delegation. No error return, because the
3263         * OPEN succeeds even if we fail.
3264         */
3265         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3266 nodeleg:
3267         status = nfs_ok;
3268 
3269         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3270                 STATEID_VAL(&stp->st_stid.sc_stateid));
3271 out:
3272         /* 4.1 client trying to upgrade/downgrade delegation? */
3273         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3274             open->op_deleg_want)
3275                 nfsd4_deleg_xgrade_none_ext(open, dp);
3276 
3277         if (fp)
3278                 put_nfs4_file(fp);
3279         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3280                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3281         /*
3282         * To finish the open response, we just need to set the rflags.
3283         */
3284         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3285         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3286             !nfsd4_has_session(&resp->cstate))
3287                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3288 
3289         return status;
3290 }
3291 
3292 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3293 {
3294         if (open->op_openowner) {
3295                 struct nfs4_openowner *oo = open->op_openowner;
3296 
3297                 if (!list_empty(&oo->oo_owner.so_stateids))
3298                         list_del_init(&oo->oo_close_lru);
3299                 if (oo->oo_flags & NFS4_OO_NEW) {
3300                         if (status) {
3301                                 release_openowner(oo);
3302                                 open->op_openowner = NULL;
3303                         } else
3304                                 oo->oo_flags &= ~NFS4_OO_NEW;
3305                 }
3306         }
3307         if (open->op_file)
3308                 nfsd4_free_file(open->op_file);
3309         if (open->op_stp)
3310                 free_generic_stateid(open->op_stp);
3311 }
3312 
3313 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3314 {
3315         struct nfs4_client *found;
3316 
3317         if (STALE_CLIENTID(clid, nn))
3318                 return nfserr_stale_clientid;
3319         found = find_confirmed_client(clid, session, nn);
3320         if (clp)
3321                 *clp = found;
3322         return found ? nfs_ok : nfserr_expired;
3323 }
3324 
3325 __be32
3326 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3327             clientid_t *clid)
3328 {
3329         struct nfs4_client *clp;
3330         __be32 status;
3331         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3332 
3333         nfs4_lock_state();
3334         dprintk("process_renew(%08x/%08x): starting\n", 
3335                         clid->cl_boot, clid->cl_id);
3336         status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3337         if (status)
3338                 goto out;
3339         status = nfserr_cb_path_down;
3340         if (!list_empty(&clp->cl_delegations)
3341                         && clp->cl_cb_state != NFSD4_CB_UP)
3342                 goto out;
3343         status = nfs_ok;
3344 out:
3345         nfs4_unlock_state();
3346         return status;
3347 }
3348 
3349 static void
3350 nfsd4_end_grace(struct nfsd_net *nn)
3351 {
3352         /* do nothing if grace period already ended */
3353         if (nn->grace_ended)
3354                 return;
3355 
3356         dprintk("NFSD: end of grace period\n");
3357         nn->grace_ended = true;
3358         nfsd4_record_grace_done(nn, nn->boot_time);
3359         locks_end_grace(&nn->nfsd4_manager);
3360         /*
3361          * Now that every NFSv4 client has had the chance to recover and
3362          * to see the (possibly new, possibly shorter) lease time, we
3363          * can safely set the next grace time to the current lease time:
3364          */
3365         nn->nfsd4_grace = nn->nfsd4_lease;
3366 }
3367 
3368 static time_t
3369 nfs4_laundromat(struct nfsd_net *nn)
3370 {
3371         struct nfs4_client *clp;
3372         struct nfs4_openowner *oo;
3373         struct nfs4_delegation *dp;
3374         struct list_head *pos, *next, reaplist;
3375         time_t cutoff = get_seconds() - nn->nfsd4_lease;
3376         time_t t, clientid_val = nn->nfsd4_lease;
3377         time_t u, test_val = nn->nfsd4_lease;
3378 
3379         nfs4_lock_state();
3380 
3381         dprintk("NFSD: laundromat service - starting\n");
3382         nfsd4_end_grace(nn);
3383         INIT_LIST_HEAD(&reaplist);
3384         spin_lock(&nn->client_lock);
3385         list_for_each_safe(pos, next, &nn->client_lru) {
3386                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3387                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3388                         t = clp->cl_time - cutoff;
3389                         if (clientid_val > t)
3390                                 clientid_val = t;
3391                         break;
3392                 }
3393                 if (mark_client_expired_locked(clp)) {
3394                         dprintk("NFSD: client in use (clientid %08x)\n",
3395                                 clp->cl_clientid.cl_id);
3396                         continue;
3397                 }
3398                 list_move(&clp->cl_lru, &reaplist);
3399         }
3400         spin_unlock(&nn->client_lock);
3401         list_for_each_safe(pos, next, &reaplist) {
3402                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3403                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3404                         clp->cl_clientid.cl_id);
3405                 expire_client(clp);
3406         }
3407         spin_lock(&recall_lock);
3408         list_for_each_safe(pos, next, &nn->del_recall_lru) {
3409                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3410                 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3411                         continue;
3412                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3413                         u = dp->dl_time - cutoff;
3414                         if (test_val > u)
3415                                 test_val = u;
3416                         break;
3417                 }
3418                 list_move(&dp->dl_recall_lru, &reaplist);
3419         }
3420         spin_unlock(&recall_lock);
3421         list_for_each_safe(pos, next, &reaplist) {
3422                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3423                 revoke_delegation(dp);
3424         }
3425         test_val = nn->nfsd4_lease;
3426         list_for_each_safe(pos, next, &nn->close_lru) {
3427                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3428                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3429                         u = oo->oo_time - cutoff;
3430                         if (test_val > u)
3431                                 test_val = u;
3432                         break;
3433                 }
3434                 release_openowner(oo);
3435         }
3436         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3437                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3438         nfs4_unlock_state();
3439         return clientid_val;
3440 }
3441 
3442 static struct workqueue_struct *laundry_wq;
3443 static void laundromat_main(struct work_struct *);
3444 
3445 static void
3446 laundromat_main(struct work_struct *laundry)
3447 {
3448         time_t t;
3449         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3450                                                   work);
3451         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3452                                            laundromat_work);
3453 
3454         t = nfs4_laundromat(nn);
3455         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3456         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3457 }
3458 
3459 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3460 {
3461         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3462                 return nfserr_bad_stateid;
3463         return nfs_ok;
3464 }
3465 
3466 static inline int
3467 access_permit_read(struct nfs4_ol_stateid *stp)
3468 {
3469         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3470                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3471                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3472 }
3473 
3474 static inline int
3475 access_permit_write(struct nfs4_ol_stateid *stp)
3476 {
3477         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3478                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3479 }
3480 
3481 static
3482 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3483 {
3484         __be32 status = nfserr_openmode;
3485 
3486         /* For lock stateid's, we test the parent open, not the lock: */
3487         if (stp->st_openstp)
3488                 stp = stp->st_openstp;
3489         if ((flags & WR_STATE) && !access_permit_write(stp))
3490                 goto out;
3491         if ((flags & RD_STATE) && !access_permit_read(stp))
3492                 goto out;
3493         status = nfs_ok;
3494 out:
3495         return status;
3496 }
3497 
3498 static inline __be32
3499 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3500 {
3501         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3502                 return nfs_ok;
3503         else if (locks_in_grace(net)) {
3504                 /* Answer in remaining cases depends on existence of
3505                  * conflicting state; so we must wait out the grace period. */
3506                 return nfserr_grace;
3507         } else if (flags & WR_STATE)
3508                 return nfs4_share_conflict(current_fh,
3509                                 NFS4_SHARE_DENY_WRITE);
3510         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3511                 return nfs4_share_conflict(current_fh,
3512                                 NFS4_SHARE_DENY_READ);
3513 }
3514 
3515 /*
3516  * Allow READ/WRITE during grace period on recovered state only for files
3517  * that are not able to provide mandatory locking.
3518  */
3519 static inline int
3520 grace_disallows_io(struct net *net, struct inode *inode)
3521 {
3522         return locks_in_grace(net) && mandatory_lock(inode);
3523 }
3524 
3525 /* Returns true iff a is later than b: */
3526 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3527 {
3528         return (s32)(a->si_generation - b->si_generation) > 0;
3529 }
3530 
3531 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3532 {
3533         /*
3534          * When sessions are used the stateid generation number is ignored
3535          * when it is zero.
3536          */
3537         if (has_session && in->si_generation == 0)
3538                 return nfs_ok;
3539 
3540         if (in->si_generation == ref->si_generation)
3541                 return nfs_ok;
3542 
3543         /* If the client sends us a stateid from the future, it's buggy: */
3544         if (stateid_generation_after(in, ref))
3545                 return nfserr_bad_stateid;
3546         /*
3547          * However, we could see a stateid from the past, even from a
3548          * non-buggy client.  For example, if the client sends a lock
3549          * while some IO is outstanding, the lock may bump si_generation
3550          * while the IO is still in flight.  The client could avoid that
3551          * situation by waiting for responses on all the IO requests,
3552          * but better performance may result in retrying IO that
3553          * receives an old_stateid error if requests are rarely
3554          * reordered in flight:
3555          */
3556         return nfserr_old_stateid;
3557 }
3558 
3559 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3560 {
3561         struct nfs4_stid *s;
3562         struct nfs4_ol_stateid *ols;
3563         __be32 status;
3564 
3565         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3566                 return nfserr_bad_stateid;
3567         /* Client debugging aid. */
3568         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3569                 char addr_str[INET6_ADDRSTRLEN];
3570                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3571                                  sizeof(addr_str));
3572                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3573                                         "with incorrect client ID\n", addr_str);
3574                 return nfserr_bad_stateid;
3575         }
3576         s = find_stateid(cl, stateid);
3577         if (!s)
3578                 return nfserr_bad_stateid;
3579         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3580         if (status)
3581                 return status;
3582         switch (s->sc_type) {
3583         case NFS4_DELEG_STID:
3584                 return nfs_ok;
3585         case NFS4_REVOKED_DELEG_STID:
3586                 return nfserr_deleg_revoked;
3587         case NFS4_OPEN_STID:
3588         case NFS4_LOCK_STID:
3589                 ols = openlockstateid(s);
3590                 if (ols->st_stateowner->so_is_open_owner
3591                                 && !(openowner(ols->st_stateowner)->oo_flags
3592                                                 & NFS4_OO_CONFIRMED))
3593                         return nfserr_bad_stateid;
3594                 return nfs_ok;
3595         default:
3596                 printk("unknown stateid type %x\n", s->sc_type);
3597         case NFS4_CLOSED_STID:
3598                 return nfserr_bad_stateid;
3599         }
3600 }
3601 
3602 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3603                                    struct nfs4_stid **s, bool sessions,
3604                                    struct nfsd_net *nn)
3605 {
3606         struct nfs4_client *cl;
3607         __be32 status;
3608 
3609         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3610                 return nfserr_bad_stateid;
3611         status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3612                                                         nn, &cl);
3613         if (status == nfserr_stale_clientid)
3614                 return nfserr_stale_stateid;
3615         if (status)
3616                 return status;
3617         *s = find_stateid_by_type(cl, stateid, typemask);
3618         if (!*s)
3619                 return nfserr_bad_stateid;
3620         return nfs_ok;
3621 }
3622 
3623 /*
3624 * Checks for stateid operations
3625 */
3626 __be32
3627 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3628                            stateid_t *stateid, int flags, struct file **filpp)
3629 {
3630         struct nfs4_stid *s;
3631         struct nfs4_ol_stateid *stp = NULL;
3632         struct nfs4_delegation *dp = NULL;
3633         struct svc_fh *current_fh = &cstate->current_fh;
3634         struct inode *ino = current_fh->fh_dentry->d_inode;
3635         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3636         __be32 status;
3637 
3638         if (filpp)
3639                 *filpp = NULL;
3640 
3641         if (grace_disallows_io(net, ino))
3642                 return nfserr_grace;
3643 
3644         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3645                 return check_special_stateids(net, current_fh, stateid, flags);
3646 
3647         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3648                                       &s, cstate->minorversion, nn);
3649         if (status)
3650                 return status;
3651         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3652         if (status)
3653                 goto out;
3654         switch (s->sc_type) {
3655         case NFS4_DELEG_STID:
3656                 dp = delegstateid(s);
3657                 status = nfs4_check_delegmode(dp, flags);
3658                 if (status)
3659                         goto out;
3660                 if (filpp) {
3661                         *filpp = dp->dl_file->fi_deleg_file;
3662                         if (!*filpp) {
3663                                 WARN_ON_ONCE(1);
3664                                 status = nfserr_serverfault;
3665                                 goto out;
3666                         }
3667                 }
3668                 break;
3669         case NFS4_OPEN_STID:
3670         case NFS4_LOCK_STID:
3671                 stp = openlockstateid(s);
3672                 status = nfs4_check_fh(current_fh, stp);
3673                 if (status)
3674                         goto out;
3675                 if (stp->st_stateowner->so_is_open_owner
3676                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3677                         goto out;
3678                 status = nfs4_check_openmode(stp, flags);
3679                 if (status)
3680                         goto out;
3681                 if (filpp) {
3682                         if (flags & RD_STATE)
3683                                 *filpp = find_readable_file(stp->st_file);
3684                         else
3685                                 *filpp = find_writeable_file(stp->st_file);
3686                 }
3687                 break;
3688         default:
3689                 return nfserr_bad_stateid;
3690         }
3691         status = nfs_ok;
3692 out:
3693         return status;
3694 }
3695 
3696 static __be32
3697 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3698 {
3699         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
3700 
3701         if (check_for_locks(stp->st_file, lo))
3702                 return nfserr_locks_held;
3703         /*
3704          * Currently there's a 1-1 lock stateid<->lockowner
3705          * correspondance, and we have to delete the lockowner when we
3706          * delete the lock stateid:
3707          */
3708         release_lockowner(lo);
3709         return nfs_ok;
3710 }
3711 
3712 /*
3713  * Test if the stateid is valid
3714  */
3715 __be32
3716 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3717                    struct nfsd4_test_stateid *test_stateid)
3718 {
3719         struct nfsd4_test_stateid_id *stateid;
3720         struct nfs4_client *cl = cstate->session->se_client;
3721 
3722         nfs4_lock_state();
3723         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3724                 stateid->ts_id_status =
3725                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3726         nfs4_unlock_state();
3727 
3728         return nfs_ok;
3729 }
3730 
3731 __be32
3732 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3733                    struct nfsd4_free_stateid *free_stateid)
3734 {
3735         stateid_t *stateid = &free_stateid->fr_stateid;
3736         struct nfs4_stid *s;
3737         struct nfs4_delegation *dp;
3738         struct nfs4_client *cl = cstate->session->se_client;
3739         __be32 ret = nfserr_bad_stateid;
3740 
3741         nfs4_lock_state();
3742         s = find_stateid(cl, stateid);
3743         if (!s)
3744                 goto out;
3745         switch (s->sc_type) {
3746         case NFS4_DELEG_STID:
3747                 ret = nfserr_locks_held;
3748                 goto out;
3749         case NFS4_OPEN_STID:
3750         case NFS4_LOCK_STID:
3751                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3752                 if (ret)
3753                         goto out;
3754                 if (s->sc_type == NFS4_LOCK_STID)
3755                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3756                 else
3757                         ret = nfserr_locks_held;
3758                 break;
3759         case NFS4_REVOKED_DELEG_STID:
3760                 dp = delegstateid(s);
3761                 destroy_revoked_delegation(dp);
3762                 ret = nfs_ok;
3763                 break;
3764         default:
3765                 ret = nfserr_bad_stateid;
3766         }
3767 out:
3768         nfs4_unlock_state();
3769         return ret;
3770 }
3771 
3772 static inline int
3773 setlkflg (int type)
3774 {
3775         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3776                 RD_STATE : WR_STATE;
3777 }
3778 
3779 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3780 {
3781         struct svc_fh *current_fh = &cstate->current_fh;
3782         struct nfs4_stateowner *sop = stp->st_stateowner;
3783         __be32 status;
3784 
3785         status = nfsd4_check_seqid(cstate, sop, seqid);
3786         if (status)
3787                 return status;
3788         if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3789                 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3790                 /*
3791                  * "Closed" stateid's exist *only* to return
3792                  * nfserr_replay_me from the previous step, and
3793                  * revoked delegations are kept only for free_stateid.
3794                  */
3795                 return nfserr_bad_stateid;
3796         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3797         if (status)
3798                 return status;
3799         return nfs4_check_fh(current_fh, stp);
3800 }
3801 
3802 /* 
3803  * Checks for sequence id mutating operations. 
3804  */
3805 static __be32
3806 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3807                          stateid_t *stateid, char typemask,
3808                          struct nfs4_ol_stateid **stpp,
3809                          struct nfsd_net *nn)
3810 {
3811         __be32 status;
3812         struct nfs4_stid *s;
3813 
3814         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3815                 seqid, STATEID_VAL(stateid));
3816 
3817         *stpp = NULL;
3818         status = nfsd4_lookup_stateid(stateid, typemask, &s,
3819                                       cstate->minorversion, nn);
3820         if (status)
3821                 return status;
3822         *stpp = openlockstateid(s);
3823         if (!nfsd4_has_session(cstate))
3824                 cstate->replay_owner = (*stpp)->st_stateowner;
3825 
3826         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3827 }
3828 
3829 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3830                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3831 {
3832         __be32 status;
3833         struct nfs4_openowner *oo;
3834 
3835         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3836                                                 NFS4_OPEN_STID, stpp, nn);
3837         if (status)
3838                 return status;
3839         oo = openowner((*stpp)->st_stateowner);
3840         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3841                 return nfserr_bad_stateid;
3842         return nfs_ok;
3843 }
3844 
3845 __be32
3846 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3847                    struct nfsd4_open_confirm *oc)
3848 {
3849         __be32 status;
3850         struct nfs4_openowner *oo;
3851         struct nfs4_ol_stateid *stp;
3852         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3853 
3854         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3855                         (int)cstate->current_fh.fh_dentry->d_name.len,
3856                         cstate->current_fh.fh_dentry->d_name.name);
3857 
3858         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3859         if (status)
3860                 return status;
3861 
3862         nfs4_lock_state();
3863 
3864         status = nfs4_preprocess_seqid_op(cstate,
3865                                         oc->oc_seqid, &oc->oc_req_stateid,
3866                                         NFS4_OPEN_STID, &stp, nn);
3867         if (status)
3868                 goto out;
3869         oo = openowner(stp->st_stateowner);
3870         status = nfserr_bad_stateid;
3871         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3872                 goto out;
3873         oo->oo_flags |= NFS4_OO_CONFIRMED;
3874         update_stateid(&stp->st_stid.sc_stateid);
3875         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3876         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3877                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3878 
3879         nfsd4_client_record_create(oo->oo_owner.so_client);
3880         status = nfs_ok;
3881 out:
3882         nfsd4_bump_seqid(cstate, status);
3883         if (!cstate->replay_owner)
3884                 nfs4_unlock_state();
3885         return status;
3886 }
3887 
3888 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3889 {
3890         if (!test_access(access, stp))
3891                 return;
3892         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3893         clear_access(access, stp);
3894 }
3895 
3896 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3897 {
3898         switch (to_access) {
3899         case NFS4_SHARE_ACCESS_READ:
3900                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3901                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3902                 break;
3903         case NFS4_SHARE_ACCESS_WRITE:
3904                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3905                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3906                 break;
3907         case NFS4_SHARE_ACCESS_BOTH:
3908                 break;
3909         default:
3910                 WARN_ON_ONCE(1);
3911         }
3912 }
3913 
3914 static void
3915 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3916 {
3917         int i;
3918         for (i = 0; i < 4; i++) {
3919                 if ((i & deny) != i)
3920                         clear_deny(i, stp);
3921         }
3922 }
3923 
3924 __be32
3925 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3926                      struct nfsd4_compound_state *cstate,
3927                      struct nfsd4_open_downgrade *od)
3928 {
3929         __be32 status;
3930         struct nfs4_ol_stateid *stp;
3931         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3932 
3933         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
3934                         (int)cstate->current_fh.fh_dentry->d_name.len,
3935                         cstate->current_fh.fh_dentry->d_name.name);
3936 
3937         /* We don't yet support WANT bits: */
3938         if (od->od_deleg_want)
3939                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3940                         od->od_deleg_want);
3941 
3942         nfs4_lock_state();
3943         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3944                                         &od->od_stateid, &stp, nn);
3945         if (status)
3946                 goto out; 
3947         status = nfserr_inval;
3948         if (!test_access(od->od_share_access, stp)) {
3949                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3950                         stp->st_access_bmap, od->od_share_access);
3951                 goto out;
3952         }
3953         if (!test_deny(od->od_share_deny, stp)) {
3954                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3955                         stp->st_deny_bmap, od->od_share_deny);
3956                 goto out;
3957         }
3958         nfs4_stateid_downgrade(stp, od->od_share_access);
3959 
3960         reset_union_bmap_deny(od->od_share_deny, stp);
3961 
3962         update_stateid(&stp->st_stid.sc_stateid);
3963         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3964         status = nfs_ok;
3965 out:
3966         nfsd4_bump_seqid(cstate, status);
3967         if (!cstate->replay_owner)
3968                 nfs4_unlock_state();
3969         return status;
3970 }
3971 
3972 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3973 {
3974         unhash_open_stateid(s);
3975         s->st_stid.sc_type = NFS4_CLOSED_STID;
3976 }
3977 
3978 /*
3979  * nfs4_unlock_state() called after encode
3980  */
3981 __be32
3982 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3983             struct nfsd4_close *close)
3984 {
3985         __be32 status;
3986         struct nfs4_openowner *oo;
3987         struct nfs4_ol_stateid *stp;
3988         struct net *net = SVC_NET(rqstp);
3989         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3990 
3991         dprintk("NFSD: nfsd4_close on file %.*s\n", 
3992                         (int)cstate->current_fh.fh_dentry->d_name.len,
3993                         cstate->current_fh.fh_dentry->d_name.name);
3994 
3995         nfs4_lock_state();
3996         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3997                                         &close->cl_stateid,
3998                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
3999                                         &stp, nn);
4000         nfsd4_bump_seqid(cstate, status);
4001         if (status)
4002                 goto out; 
4003         oo = openowner(stp->st_stateowner);
4004         update_stateid(&stp->st_stid.sc_stateid);
4005         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4006 
4007         nfsd4_close_open_stateid(stp);
4008 
4009         if (cstate->minorversion) {
4010                 unhash_stid(&stp->st_stid);
4011                 free_generic_stateid(stp);
4012         } else
4013                 oo->oo_last_closed_stid = stp;
4014 
4015         if (list_empty(&oo->oo_owner.so_stateids)) {
4016                 if (cstate->minorversion)
4017                         release_openowner(oo);
4018                 else {
4019                         /*
4020                          * In the 4.0 case we need to keep the owners around a
4021                          * little while to handle CLOSE replay.
4022                          */
4023                         move_to_close_lru(oo, SVC_NET(rqstp));
4024                 }
4025         }
4026 out:
4027         if (!cstate->replay_owner)
4028                 nfs4_unlock_state();
4029         return status;
4030 }
4031 
4032 __be32
4033 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4034                   struct nfsd4_delegreturn *dr)
4035 {
4036         struct nfs4_delegation *dp;
4037         stateid_t *stateid = &dr->dr_stateid;
4038         struct nfs4_stid *s;
4039         __be32 status;
4040         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4041 
4042         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4043                 return status;
4044 
4045         nfs4_lock_state();
4046         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
4047                                       cstate->minorversion, nn);
4048         if (status)
4049                 goto out;
4050         dp = delegstateid(s);
4051         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4052         if (status)
4053                 goto out;
4054 
4055         destroy_delegation(dp);
4056 out:
4057         nfs4_unlock_state();
4058 
4059         return status;
4060 }
4061 
4062 
4063 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
4064 
4065 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
4066 
4067 static inline u64
4068 end_offset(u64 start, u64 len)
4069 {
4070         u64 end;
4071 
4072         end = start + len;
4073         return end >= start ? end: NFS4_MAX_UINT64;
4074 }
4075 
4076 /* last octet in a range */
4077 static inline u64
4078 last_byte_offset(u64 start, u64 len)
4079 {
4080         u64 end;
4081 
4082         WARN_ON_ONCE(!len);
4083         end = start + len;
4084         return end > start ? end - 1: NFS4_MAX_UINT64;
4085 }
4086 
4087 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4088 {
4089         return (file_hashval(inode) + cl_id
4090                         + opaque_hashval(ownername->data, ownername->len))
4091                 & LOCKOWNER_INO_HASH_MASK;
4092 }
4093 
4094 /*
4095  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4096  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4097  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
4098  * locking, this prevents us from being completely protocol-compliant.  The
4099  * real solution to this problem is to start using unsigned file offsets in
4100  * the VFS, but this is a very deep change!
4101  */
4102 static inline void
4103 nfs4_transform_lock_offset(struct file_lock *lock)
4104 {
4105         if (lock->fl_start < 0)
4106                 lock->fl_start = OFFSET_MAX;
4107         if (lock->fl_end < 0)
4108                 lock->fl_end = OFFSET_MAX;
4109 }
4110 
4111 /* Hack!: For now, we're defining this just so we can use a pointer to it
4112  * as a unique cookie to identify our (NFSv4's) posix locks. */
4113 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
4114 };
4115 
4116 static inline void
4117 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4118 {
4119         struct nfs4_lockowner *lo;
4120 
4121         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4122                 lo = (struct nfs4_lockowner *) fl->fl_owner;
4123                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4124                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
4125                 if (!deny->ld_owner.data)
4126                         /* We just don't care that much */
4127                         goto nevermind;
4128                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4129                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4130         } else {
4131 nevermind:
4132                 deny->ld_owner.len = 0;
4133                 deny->ld_owner.data = NULL;
4134                 deny->ld_clientid.cl_boot = 0;
4135                 deny->ld_clientid.cl_id = 0;
4136         }
4137         deny->ld_start = fl->fl_start;
4138         deny->ld_length = NFS4_MAX_UINT64;
4139         if (fl->fl_end != NFS4_MAX_UINT64)
4140                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
4141         deny->ld_type = NFS4_READ_LT;
4142         if (fl->fl_type != F_RDLCK)
4143                 deny->ld_type = NFS4_WRITE_LT;
4144 }
4145 
4146 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
4147 {
4148         struct nfs4_ol_stateid *lst;
4149 
4150         if (!same_owner_str(&lo->lo_owner, owner, clid))
4151                 return false;
4152         if (list_empty(&lo->lo_owner.so_stateids)) {
4153                 WARN_ON_ONCE(1);
4154                 return false;
4155         }
4156         lst = list_first_entry(&lo->lo_owner.so_stateids,
4157                                struct nfs4_ol_stateid, st_perstateowner);
4158         return lst->st_file->fi_inode == inode;
4159 }
4160 
4161 static struct nfs4_lockowner *
4162 find_lockowner_str(struct inode *inode, clientid_t *clid,
4163                    struct xdr_netobj *owner, struct nfsd_net *nn)
4164 {
4165         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4166         struct nfs4_lockowner *lo;
4167 
4168         list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4169                 if (same_lockowner_ino(lo, inode, clid, owner))
4170                         return lo;
4171         }
4172         return NULL;
4173 }
4174 
4175 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4176 {
4177         struct inode *inode = open_stp->st_file->fi_inode;
4178         unsigned int inohash = lockowner_ino_hashval(inode,
4179                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4180         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4181 
4182         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4183         list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4184         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
4185 }
4186 
4187 /*
4188  * Alloc a lock owner structure.
4189  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
4190  * occurred. 
4191  *
4192  * strhashval = ownerstr_hashval
4193  */
4194 
4195 static struct nfs4_lockowner *
4196 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4197         struct nfs4_lockowner *lo;
4198 
4199         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4200         if (!lo)
4201                 return NULL;
4202         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4203         lo->lo_owner.so_is_open_owner = 0;
4204         /* It is the openowner seqid that will be incremented in encode in the
4205          * case of new lockowners; so increment the lock seqid manually: */
4206         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4207         hash_lockowner(lo, strhashval, clp, open_stp);
4208         return lo;
4209 }
4210 
4211 static struct nfs4_ol_stateid *
4212 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4213 {
4214         struct nfs4_ol_stateid *stp;
4215         struct nfs4_client *clp = lo->lo_owner.so_client;
4216 
4217         stp = nfs4_alloc_stateid(clp);
4218         if (stp == NULL)
4219                 return NULL;
4220         stp->st_stid.sc_type = NFS4_LOCK_STID;
4221         list_add(&stp->st_perfile, &fp->fi_stateids);
4222         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4223         stp->st_stateowner = &lo->lo_owner;
4224         get_nfs4_file(fp);
4225         stp->st_file = fp;
4226         stp->st_access_bmap = 0;
4227         stp->st_deny_bmap = open_stp->st_deny_bmap;
4228         stp->st_openstp = open_stp;
4229         return stp;
4230 }
4231 
4232 static int
4233 check_lock_length(u64 offset, u64 length)
4234 {
4235         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4236              LOFF_OVERFLOW(offset, length)));
4237 }
4238 
4239 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4240 {
4241         struct nfs4_file *fp = lock_stp->st_file;
4242         int oflag = nfs4_access_to_omode(access);
4243 
4244         if (test_access(access, lock_stp))
4245                 return;
4246         nfs4_file_get_access(fp, oflag);
4247         set_access(access, lock_stp);
4248 }
4249 
4250 static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
4251 {
4252         struct nfs4_file *fi = ost->st_file;
4253         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4254         struct nfs4_client *cl = oo->oo_owner.so_client;
4255         struct nfs4_lockowner *lo;
4256         unsigned int strhashval;
4257         struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4258 
4259         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4260                                 &lock->v.new.owner, nn);
4261         if (lo) {
4262                 if (!cstate->minorversion)
4263                         return nfserr_bad_seqid;
4264                 /* XXX: a lockowner always has exactly one stateid: */
4265                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4266                                 struct nfs4_ol_stateid, st_perstateowner);
4267                 return nfs_ok;
4268         }
4269         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4270                         &lock->v.new.owner);
4271         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4272         if (lo == NULL)
4273                 return nfserr_jukebox;
4274         *lst = alloc_init_lock_stateid(lo, fi, ost);
4275         if (*lst == NULL) {
4276                 release_lockowner(lo);
4277                 return nfserr_jukebox;
4278         }
4279         *new = true;
4280         return nfs_ok;
4281 }
4282 
4283 /*
4284  *  LOCK operation 
4285  */
4286 __be32
4287 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4288            struct nfsd4_lock *lock)
4289 {
4290         struct nfs4_openowner *open_sop = NULL;
4291         struct nfs4_lockowner *lock_sop = NULL;
4292         struct nfs4_ol_stateid *lock_stp;
4293         struct file *filp = NULL;
4294         struct file_lock *file_lock = NULL;
4295         struct file_lock *conflock = NULL;
4296         __be32 status = 0;
4297         bool new_state = false;
4298         int lkflg;
4299         int err;
4300         struct net *net = SVC_NET(rqstp);
4301         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4302 
4303         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4304                 (long long) lock->lk_offset,
4305                 (long long) lock->lk_length);
4306 
4307         if (check_lock_length(lock->lk_offset, lock->lk_length))
4308                  return nfserr_inval;
4309 
4310         if ((status = fh_verify(rqstp, &cstate->current_fh,
4311                                 S_IFREG, NFSD_MAY_LOCK))) {
4312                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4313                 return status;
4314         }
4315 
4316         nfs4_lock_state();
4317 
4318         if (lock->lk_is_new) {
4319                 struct nfs4_ol_stateid *open_stp = NULL;
4320 
4321                 if (nfsd4_has_session(cstate))
4322                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4323                         memcpy(&lock->v.new.clientid,
4324                                 &cstate->session->se_client->cl_clientid,
4325                                 sizeof(clientid_t));
4326 
4327                 status = nfserr_stale_clientid;
4328                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4329                         goto out;
4330 
4331                 /* validate and update open stateid and open seqid */
4332                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4333                                         lock->lk_new_open_seqid,
4334                                         &lock->lk_new_open_stateid,
4335                                         &open_stp, nn);
4336                 if (status)
4337                         goto out;
4338                 open_sop = openowner(open_stp->st_stateowner);
4339                 status = nfserr_bad_stateid;
4340                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4341                                                 &lock->v.new.clientid))
4342                         goto out;
4343                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4344                                                         &lock_stp, &new_state);
4345         } else
4346                 status = nfs4_preprocess_seqid_op(cstate,
4347                                        lock->lk_old_lock_seqid,
4348                                        &lock->lk_old_lock_stateid,
4349                                        NFS4_LOCK_STID, &lock_stp, nn);
4350         if (status)
4351                 goto out;
4352         lock_sop = lockowner(lock_stp->st_stateowner);
4353 
4354         lkflg = setlkflg(lock->lk_type);
4355         status = nfs4_check_openmode(lock_stp, lkflg);
4356         if (status)
4357                 goto out;
4358 
4359         status = nfserr_grace;
4360         if (locks_in_grace(net) && !lock->lk_reclaim)
4361                 goto out;
4362         status = nfserr_no_grace;
4363         if (!locks_in_grace(net) && lock->lk_reclaim)
4364                 goto out;
4365 
4366         file_lock = locks_alloc_lock();
4367         if (!file_lock) {
4368                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4369                 status = nfserr_jukebox;
4370                 goto out;
4371         }
4372 
4373         locks_init_lock(file_lock);
4374         switch (lock->lk_type) {
4375                 case NFS4_READ_LT:
4376                 case NFS4_READW_LT:
4377                         filp = find_readable_file(lock_stp->st_file);
4378                         if (filp)
4379                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4380                         file_lock->fl_type = F_RDLCK;
4381                         break;
4382                 case NFS4_WRITE_LT:
4383                 case NFS4_WRITEW_LT:
4384                         filp = find_writeable_file(lock_stp->st_file);
4385                         if (filp)
4386                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4387                         file_lock->fl_type = F_WRLCK;
4388                         break;
4389                 default:
4390                         status = nfserr_inval;
4391                 goto out;
4392         }
4393         if (!filp) {
4394                 status = nfserr_openmode;
4395                 goto out;
4396         }
4397         file_lock->fl_owner = (fl_owner_t)lock_sop;
4398         file_lock->fl_pid = current->tgid;
4399         file_lock->fl_file = filp;
4400         file_lock->fl_flags = FL_POSIX;
4401         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4402         file_lock->fl_start = lock->lk_offset;
4403         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4404         nfs4_transform_lock_offset(file_lock);
4405 
4406         conflock = locks_alloc_lock();
4407         if (!conflock) {
4408                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4409                 status = nfserr_jukebox;
4410                 goto out;
4411         }
4412 
4413         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4414         switch (-err) {
4415         case 0: /* success! */
4416                 update_stateid(&lock_stp->st_stid.sc_stateid);
4417                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid, 
4418                                 sizeof(stateid_t));
4419                 status = 0;
4420                 break;
4421         case (EAGAIN):          /* conflock holds conflicting lock */
4422                 status = nfserr_denied;
4423                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4424                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4425                 break;
4426         case (EDEADLK):
4427                 status = nfserr_deadlock;
4428                 break;
4429         default:
4430                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4431                 status = nfserrno(err);
4432                 break;
4433         }
4434 out:
4435         if (status && new_state)
4436                 release_lockowner(lock_sop);
4437         nfsd4_bump_seqid(cstate, status);
4438         if (!cstate->replay_owner)
4439                 nfs4_unlock_state();
4440         if (file_lock)
4441                 locks_free_lock(file_lock);
4442         if (conflock)
4443                 locks_free_lock(conflock);
4444         return status;
4445 }
4446 
4447 /*
4448  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4449  * so we do a temporary open here just to get an open file to pass to
4450  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4451  * inode operation.)
4452  */
4453 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4454 {
4455         struct file *file;
4456         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4457         if (!err) {
4458                 err = nfserrno(vfs_test_lock(file, lock));
4459                 nfsd_close(file);
4460         }
4461         return err;
4462 }
4463 
4464 /*
4465  * LOCKT operation
4466  */
4467 __be32
4468 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4469             struct nfsd4_lockt *lockt)
4470 {
4471         struct inode *inode;
4472         struct file_lock *file_lock = NULL;
4473         struct nfs4_lockowner *lo;
4474         __be32 status;
4475         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4476 
4477         if (locks_in_grace(SVC_NET(rqstp)))
4478                 return nfserr_grace;
4479 
4480         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4481                  return nfserr_inval;
4482 
4483         nfs4_lock_state();
4484 
4485         if (!nfsd4_has_session(cstate)) {
4486                 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4487                 if (status)
4488                         goto out;
4489         }
4490 
4491         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4492                 goto out;
4493 
4494         inode = cstate->current_fh.fh_dentry->d_inode;
4495         file_lock = locks_alloc_lock();
4496         if (!file_lock) {
4497                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4498                 status = nfserr_jukebox;
4499                 goto out;
4500         }
4501         locks_init_lock(file_lock);
4502         switch (lockt->lt_type) {
4503                 case NFS4_READ_LT:
4504                 case NFS4_READW_LT:
4505                         file_lock->fl_type = F_RDLCK;
4506                 break;
4507                 case NFS4_WRITE_LT:
4508                 case NFS4_WRITEW_LT:
4509                         file_lock->fl_type = F_WRLCK;
4510                 break;
4511                 default:
4512                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4513                         status = nfserr_inval;
4514                 goto out;
4515         }
4516 
4517         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4518         if (lo)
4519                 file_lock->fl_owner = (fl_owner_t)lo;
4520         file_lock->fl_pid = current->tgid;
4521         file_lock->fl_flags = FL_POSIX;
4522 
4523         file_lock->fl_start = lockt->lt_offset;
4524         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4525 
4526         nfs4_transform_lock_offset(file_lock);
4527 
4528         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4529         if (status)
4530                 goto out;
4531 
4532         if (file_lock->fl_type != F_UNLCK) {
4533                 status = nfserr_denied;
4534                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4535         }
4536 out:
4537         nfs4_unlock_state();
4538         if (file_lock)
4539                 locks_free_lock(file_lock);
4540         return status;
4541 }
4542 
4543 __be32
4544 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4545             struct nfsd4_locku *locku)
4546 {
4547         struct nfs4_ol_stateid *stp;
4548         struct file *filp = NULL;
4549         struct file_lock *file_lock = NULL;
4550         __be32 status;
4551         int err;
4552         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4553 
4554         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4555                 (long long) locku->lu_offset,
4556                 (long long) locku->lu_length);
4557 
4558         if (check_lock_length(locku->lu_offset, locku->lu_length))
4559                  return nfserr_inval;
4560 
4561         nfs4_lock_state();
4562                                                                                 
4563         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4564                                         &locku->lu_stateid, NFS4_LOCK_STID,
4565                                         &stp, nn);
4566         if (status)
4567                 goto out;
4568         filp = find_any_file(stp->st_file);
4569         if (!filp) {
4570                 status = nfserr_lock_range;
4571                 goto out;
4572         }
4573         file_lock = locks_alloc_lock();
4574         if (!file_lock) {
4575                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4576                 status = nfserr_jukebox;
4577                 goto out;
4578         }
4579         locks_init_lock(file_lock);
4580         file_lock->fl_type = F_UNLCK;
4581         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4582         file_lock->fl_pid = current->tgid;
4583         file_lock->fl_file = filp;
4584         file_lock->fl_flags = FL_POSIX;
4585         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4586         file_lock->fl_start = locku->lu_offset;
4587 
4588         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4589                                                 locku->lu_length);
4590         nfs4_transform_lock_offset(file_lock);
4591 
4592         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4593         if (err) {
4594                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4595                 goto out_nfserr;
4596         }
4597         update_stateid(&stp->st_stid.sc_stateid);
4598         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4599 
4600 out:
4601         nfsd4_bump_seqid(cstate, status);
4602         if (!cstate->replay_owner)
4603                 nfs4_unlock_state();
4604         if (file_lock)
4605                 locks_free_lock(file_lock);
4606         return status;
4607 
4608 out_nfserr:
4609         status = nfserrno(err);
4610         goto out;
4611 }
4612 
4613 /*
4614  * returns
4615  *      1: locks held by lockowner
4616  *      0: no locks held by lockowner
4617  */
4618 static int
4619 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4620 {
4621         struct file_lock **flpp;
4622         struct inode *inode = filp->fi_inode;
4623         int status = 0;
4624 
4625         spin_lock(&inode->i_lock);
4626         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4627                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4628                         status = 1;
4629                         goto out;
4630                 }
4631         }
4632 out:
4633         spin_unlock(&inode->i_lock);
4634         return status;
4635 }
4636 
4637 __be32
4638 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4639                         struct nfsd4_compound_state *cstate,
4640                         struct nfsd4_release_lockowner *rlockowner)
4641 {
4642         clientid_t *clid = &rlockowner->rl_clientid;
4643         struct nfs4_stateowner *sop;
4644         struct nfs4_lockowner *lo;
4645         struct nfs4_ol_stateid *stp;
4646         struct xdr_netobj *owner = &rlockowner->rl_owner;
4647         struct list_head matches;
4648         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4649         __be32 status;
4650         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4651 
4652         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4653                 clid->cl_boot, clid->cl_id);
4654 
4655         nfs4_lock_state();
4656 
4657         status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4658         if (status)
4659                 goto out;
4660 
4661         status = nfserr_locks_held;
4662         INIT_LIST_HEAD(&matches);
4663 
4664         list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4665                 if (sop->so_is_open_owner)
4666                         continue;
4667                 if (!same_owner_str(sop, owner, clid))
4668                         continue;
4669                 list_for_each_entry(stp, &sop->so_stateids,
4670                                 st_perstateowner) {
4671                         lo = lockowner(sop);
4672                         if (check_for_locks(stp->st_file, lo))
4673                                 goto out;
4674                         list_add(&lo->lo_list, &matches);
4675                 }
4676         }
4677         /* Clients probably won't expect us to return with some (but not all)
4678          * of the lockowner state released; so don't release any until all
4679          * have been checked. */
4680         status = nfs_ok;
4681         while (!list_empty(&matches)) {
4682                 lo = list_entry(matches.next, struct nfs4_lockowner,
4683                                                                 lo_list);
4684                 /* unhash_stateowner deletes so_perclient only
4685                  * for openowners. */
4686                 list_del(&lo->lo_list);
4687                 release_lockowner(lo);
4688         }
4689 out:
4690         nfs4_unlock_state();
4691         return status;
4692 }
4693 
4694 static inline struct nfs4_client_reclaim *
4695 alloc_reclaim(void)
4696 {
4697         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4698 }
4699 
4700 bool
4701 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4702 {
4703         struct nfs4_client_reclaim *crp;
4704 
4705         crp = nfsd4_find_reclaim_client(name, nn);
4706         return (crp && crp->cr_clp);
4707 }
4708 
4709 /*
4710  * failure => all reset bets are off, nfserr_no_grace...
4711  */
4712 struct nfs4_client_reclaim *
4713 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4714 {
4715         unsigned int strhashval;
4716         struct nfs4_client_reclaim *crp;
4717 
4718         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4719         crp = alloc_reclaim();
4720         if (crp) {
4721                 strhashval = clientstr_hashval(name);
4722                 INIT_LIST_HEAD(&crp->cr_strhash);
4723                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4724                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4725                 crp->cr_clp = NULL;
4726                 nn->reclaim_str_hashtbl_size++;
4727         }
4728         return crp;
4729 }
4730 
4731 void
4732 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4733 {
4734         list_del(&crp->cr_strhash);
4735         kfree(crp);
4736         nn->reclaim_str_hashtbl_size--;
4737 }
4738 
4739 void
4740 nfs4_release_reclaim(struct nfsd_net *nn)
4741 {
4742         struct nfs4_client_reclaim *crp = NULL;
4743         int i;
4744 
4745         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4746                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4747                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4748                                         struct nfs4_client_reclaim, cr_strhash);
4749                         nfs4_remove_reclaim_record(crp, nn);
4750                 }
4751         }
4752         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4753 }
4754 
4755 /*
4756  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4757 struct nfs4_client_reclaim *
4758 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4759 {
4760         unsigned int strhashval;
4761         struct nfs4_client_reclaim *crp = NULL;
4762 
4763         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4764 
4765         strhashval = clientstr_hashval(recdir);
4766         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4767                 if (same_name(crp->cr_recdir, recdir)) {
4768                         return crp;
4769                 }
4770         }
4771         return NULL;
4772 }
4773 
4774 /*
4775 * Called from OPEN. Look for clientid in reclaim list.
4776 */
4777 __be32
4778 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4779 {
4780         struct nfs4_client *clp;
4781 
4782         /* find clientid in conf_id_hashtbl */
4783         clp = find_confirmed_client(clid, sessions, nn);
4784         if (clp == NULL)
4785                 return nfserr_reclaim_bad;
4786 
4787         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4788 }
4789 
4790 #ifdef CONFIG_NFSD_FAULT_INJECTION
4791 
4792 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4793 {
4794         if (mark_client_expired(clp))
4795                 return 0;
4796         expire_client(clp);
4797         return 1;
4798 }
4799 
4800 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4801 {
4802         char buf[INET6_ADDRSTRLEN];
4803         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4804         printk(KERN_INFO "NFS Client: %s\n", buf);
4805         return 1;
4806 }
4807 
4808 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4809                              const char *type)
4810 {
4811         char buf[INET6_ADDRSTRLEN];
4812         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4813         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4814 }
4815 
4816 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4817 {
4818         struct nfs4_openowner *oop;
4819         struct nfs4_lockowner *lop, *lo_next;
4820         struct nfs4_ol_stateid *stp, *st_next;
4821         u64 count = 0;
4822 
4823         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4824                 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4825                         list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4826                                 if (func)
4827                                         func(lop);
4828                                 if (++count == max)
4829                                         return count;
4830                         }
4831                 }
4832         }
4833 
4834         return count;
4835 }
4836 
4837 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4838 {
4839         return nfsd_foreach_client_lock(clp, max, release_lockowner);
4840 }
4841 
4842 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4843 {
4844         u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4845         nfsd_print_count(clp, count, "locked files");
4846         return count;
4847 }
4848 
4849 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4850 {
4851         struct nfs4_openowner *oop, *next;
4852         u64 count = 0;
4853 
4854         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4855                 if (func)
4856                         func(oop);
4857                 if (++count == max)
4858                         break;
4859         }
4860 
4861         return count;
4862 }
4863 
4864 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4865 {
4866         return nfsd_foreach_client_open(clp, max, release_openowner);
4867 }
4868 
4869 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4870 {
4871         u64 count = nfsd_foreach_client_open(clp, max, NULL);
4872         nfsd_print_count(clp, count, "open files");
4873         return count;
4874 }
4875 
4876 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4877                                      struct list_head *victims)
4878 {
4879         struct nfs4_delegation *dp, *next;
4880         u64 count = 0;
4881 
4882         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4883                 if (victims)
4884                         list_move(&dp->dl_recall_lru, victims);
4885                 if (++count == max)
4886                         break;
4887         }
4888         return count;
4889 }
4890 
4891 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4892 {
4893         struct nfs4_delegation *dp, *next;
4894         LIST_HEAD(victims);
4895         u64 count;
4896 
4897         spin_lock(&recall_lock);
4898         count = nfsd_find_all_delegations(clp, max, &victims);
4899         spin_unlock(&recall_lock);
4900 
4901         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4902                 revoke_delegation(dp);
4903 
4904         return count;
4905 }
4906 
4907 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4908 {
4909         struct nfs4_delegation *dp, *next;
4910         LIST_HEAD(victims);
4911         u64 count;
4912 
4913         spin_lock(&recall_lock);
4914         count = nfsd_find_all_delegations(clp, max, &victims);
4915         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4916                 nfsd_break_one_deleg(dp);
4917         spin_unlock(&recall_lock);
4918 
4919         return count;
4920 }
4921 
4922 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4923 {
4924         u64 count = 0;
4925 
4926         spin_lock(&recall_lock);
4927         count = nfsd_find_all_delegations(clp, max, NULL);
4928         spin_unlock(&recall_lock);
4929 
4930         nfsd_print_count(clp, count, "delegations");
4931         return count;
4932 }
4933 
4934 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4935 {
4936         struct nfs4_client *clp, *next;
4937         u64 count = 0;
4938         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4939 
4940         if (!nfsd_netns_ready(nn))
4941                 return 0;
4942 
4943         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4944                 count += func(clp, max - count);
4945                 if ((max != 0) && (count >= max))
4946                         break;
4947         }
4948 
4949         return count;
4950 }
4951 
4952 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4953 {
4954         struct nfs4_client *clp;
4955         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4956 
4957         if (!nfsd_netns_ready(nn))
4958                 return NULL;
4959 
4960         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4961                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
4962                         return clp;
4963         }
4964         return NULL;
4965 }
4966 
4967 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4968 
4969 /* initialization to perform at module load time: */
4970 
4971 void
4972 nfs4_state_init(void)
4973 {
4974 }
4975 
4976 /*
4977  * Since the lifetime of a delegation isn't limited to that of an open, a
4978  * client may quite reasonably hang on to a delegation as long as it has
4979  * the inode cached.  This becomes an obvious problem the first time a
4980  * client's inode cache approaches the size of the server's total memory.
4981  *
4982  * For now we avoid this problem by imposing a hard limit on the number
4983  * of delegations, which varies according to the server's memory size.
4984  */
4985 static void
4986 set_max_delegations(void)
4987 {
4988         /*
4989          * Allow at most 4 delegations per megabyte of RAM.  Quick
4990          * estimates suggest that in the worst case (where every delegation
4991          * is for a different inode), a delegation could take about 1.5K,
4992          * giving a worst case usage of about 6% of memory.
4993          */
4994         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4995 }
4996 
4997 static int nfs4_state_create_net(struct net *net)
4998 {
4999         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5000         int i;
5001 
5002         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5003                         CLIENT_HASH_SIZE, GFP_KERNEL);
5004         if (!nn->conf_id_hashtbl)
5005                 goto err;
5006         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5007                         CLIENT_HASH_SIZE, GFP_KERNEL);
5008         if (!nn->unconf_id_hashtbl)
5009                 goto err_unconf_id;
5010         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5011                         OWNER_HASH_SIZE, GFP_KERNEL);
5012         if (!nn->ownerstr_hashtbl)
5013                 goto err_ownerstr;
5014         nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
5015                         LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
5016         if (!nn->lockowner_ino_hashtbl)
5017                 goto err_lockowner_ino;
5018         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5019                         SESSION_HASH_SIZE, GFP_KERNEL);
5020         if (!nn->sessionid_hashtbl)
5021                 goto err_sessionid;
5022 
5023         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5024                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5025                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5026         }
5027         for (i = 0; i < OWNER_HASH_SIZE; i++)
5028                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5029         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
5030                 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
5031         for (i = 0; i < SESSION_HASH_SIZE; i++)
5032                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5033         nn->conf_name_tree = RB_ROOT;
5034         nn->unconf_name_tree = RB_ROOT;
5035         INIT_LIST_HEAD(&nn->client_lru);
5036         INIT_LIST_HEAD(&nn->close_lru);
5037         INIT_LIST_HEAD(&nn->del_recall_lru);
5038         spin_lock_init(&nn->client_lock);
5039 
5040         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
5041         get_net(net);
5042 
5043         return 0;
5044 
5045 err_sessionid:
5046         kfree(nn->lockowner_ino_hashtbl);
5047 err_lockowner_ino:
5048         kfree(nn->ownerstr_hashtbl);
5049 err_ownerstr:
5050         kfree(nn->unconf_id_hashtbl);
5051 err_unconf_id:
5052         kfree(nn->conf_id_hashtbl);
5053 err:
5054         return -ENOMEM;
5055 }
5056 
5057 static void
5058 nfs4_state_destroy_net(struct net *net)
5059 {
5060         int i;
5061         struct nfs4_client *clp = NULL;
5062         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5063 
5064         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5065                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
5066                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5067                         destroy_client(clp);
5068                 }
5069         }
5070 
5071         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5072                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5073                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5074                         destroy_client(clp);
5075                 }
5076         }
5077 
5078         kfree(nn->sessionid_hashtbl);
5079         kfree(nn->lockowner_ino_hashtbl);
5080         kfree(nn->ownerstr_hashtbl);
5081         kfree(nn->unconf_id_hashtbl);
5082         kfree(nn->conf_id_hashtbl);
5083         put_net(net);
5084 }
5085 
5086 int
5087 nfs4_state_start_net(struct net *net)
5088 {
5089         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5090         int ret;
5091 
5092         ret = nfs4_state_create_net(net);
5093         if (ret)
5094                 return ret;
5095         nfsd4_client_tracking_init(net);
5096         nn->boot_time = get_seconds();
5097         locks_start_grace(net, &nn->nfsd4_manager);
5098         nn->grace_ended = false;
5099         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5100                nn->nfsd4_grace, net);
5101         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5102         return 0;
5103 }
5104 
5105 /* initialization to perform when the nfsd service is started: */
5106 
5107 int
5108 nfs4_state_start(void)
5109 {
5110         int ret;
5111 
5112         ret = set_callback_cred();
5113         if (ret)
5114                 return -ENOMEM;
5115         laundry_wq = create_singlethread_workqueue("nfsd4");
5116         if (laundry_wq == NULL) {
5117                 ret = -ENOMEM;
5118                 goto out_recovery;
5119         }
5120         ret = nfsd4_create_callback_queue();
5121         if (ret)
5122                 goto out_free_laundry;
5123 
5124         set_max_delegations();
5125 
5126         return 0;
5127 
5128 out_free_laundry:
5129         destroy_workqueue(laundry_wq);
5130 out_recovery:
5131         return ret;
5132 }
5133 
5134 /* should be called with the state lock held */
5135 void
5136 nfs4_state_shutdown_net(struct net *net)
5137 {
5138         struct nfs4_delegation *dp = NULL;
5139         struct list_head *pos, *next, reaplist;
5140         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5141 
5142         cancel_delayed_work_sync(&nn->laundromat_work);
5143         locks_end_grace(&nn->nfsd4_manager);
5144 
5145         INIT_LIST_HEAD(&reaplist);
5146         spin_lock(&recall_lock);
5147         list_for_each_safe(pos, next, &nn->del_recall_lru) {
5148                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5149                 list_move(&dp->dl_recall_lru, &reaplist);
5150         }
5151         spin_unlock(&recall_lock);
5152         list_for_each_safe(pos, next, &reaplist) {
5153                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5154                 destroy_delegation(dp);
5155         }
5156 
5157         nfsd4_client_tracking_exit(net);
5158         nfs4_state_destroy_net(net);
5159 }
5160 
5161 void
5162 nfs4_state_shutdown(void)
5163 {
5164         destroy_workqueue(laundry_wq);
5165         nfsd4_destroy_callback_queue();
5166 }
5167 
5168 static void
5169 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5170 {
5171         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5172                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5173 }
5174 
5175 static void
5176 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5177 {
5178         if (cstate->minorversion) {
5179                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5180                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5181         }
5182 }
5183 
5184 void
5185 clear_current_stateid(struct nfsd4_compound_state *cstate)
5186 {
5187         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5188 }
5189 
5190 /*
5191  * functions to set current state id
5192  */
5193 void
5194 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5195 {
5196         put_stateid(cstate, &odp->od_stateid);
5197 }
5198 
5199 void
5200 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5201 {
5202         put_stateid(cstate, &open->op_stateid);
5203 }
5204 
5205 void
5206 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5207 {
5208         put_stateid(cstate, &close->cl_stateid);
5209 }
5210 
5211 void
5212 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5213 {
5214         put_stateid(cstate, &lock->lk_resp_stateid);
5215 }
5216 
5217 /*
5218  * functions to consume current state id
5219  */
5220 
5221 void
5222 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5223 {
5224         get_stateid(cstate, &odp->od_stateid);
5225 }
5226 
5227 void
5228 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5229 {
5230         get_stateid(cstate, &drp->dr_stateid);
5231 }
5232 
5233 void
5234 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5235 {
5236         get_stateid(cstate, &fsp->fr_stateid);
5237 }
5238 
5239 void
5240 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5241 {
5242         get_stateid(cstate, &setattr->sa_stateid);
5243 }
5244 
5245 void
5246 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5247 {
5248         get_stateid(cstate, &close->cl_stateid);
5249 }
5250 
5251 void
5252 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5253 {
5254         get_stateid(cstate, &locku->lu_stateid);
5255 }
5256 
5257 void
5258 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5259 {
5260         get_stateid(cstate, &read->rd_stateid);
5261 }
5262 
5263 void
5264 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5265 {
5266         get_stateid(cstate, &write->wr_stateid);
5267 }
5268 

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