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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 <linux/jhash.h>
 45 #include "xdr4.h"
 46 #include "xdr4cb.h"
 47 #include "vfs.h"
 48 #include "current_stateid.h"
 49 
 50 #include "netns.h"
 51 #include "pnfs.h"
 52 
 53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 54 
 55 #define all_ones {{~0,~0},~0}
 56 static const stateid_t one_stateid = {
 57         .si_generation = ~0,
 58         .si_opaque = all_ones,
 59 };
 60 static const stateid_t zero_stateid = {
 61         /* all fields zero */
 62 };
 63 static const stateid_t currentstateid = {
 64         .si_generation = 1,
 65 };
 66 static const stateid_t close_stateid = {
 67         .si_generation = 0xffffffffU,
 68 };
 69 
 70 static u64 current_sessionid = 1;
 71 
 72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
 73 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
 74 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
 75 #define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
 76 
 77 /* forward declarations */
 78 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
 79 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
 80 
 81 /* Locking: */
 82 
 83 /*
 84  * Currently used for the del_recall_lru and file hash table.  In an
 85  * effort to decrease the scope of the client_mutex, this spinlock may
 86  * eventually cover more:
 87  */
 88 static DEFINE_SPINLOCK(state_lock);
 89 
 90 enum nfsd4_st_mutex_lock_subclass {
 91         OPEN_STATEID_MUTEX = 0,
 92         LOCK_STATEID_MUTEX = 1,
 93 };
 94 
 95 /*
 96  * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
 97  * the refcount on the open stateid to drop.
 98  */
 99 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
100 
101 static struct kmem_cache *client_slab;
102 static struct kmem_cache *openowner_slab;
103 static struct kmem_cache *lockowner_slab;
104 static struct kmem_cache *file_slab;
105 static struct kmem_cache *stateid_slab;
106 static struct kmem_cache *deleg_slab;
107 static struct kmem_cache *odstate_slab;
108 
109 static void free_session(struct nfsd4_session *);
110 
111 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
112 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
113 
114 static bool is_session_dead(struct nfsd4_session *ses)
115 {
116         return ses->se_flags & NFS4_SESSION_DEAD;
117 }
118 
119 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
120 {
121         if (atomic_read(&ses->se_ref) > ref_held_by_me)
122                 return nfserr_jukebox;
123         ses->se_flags |= NFS4_SESSION_DEAD;
124         return nfs_ok;
125 }
126 
127 static bool is_client_expired(struct nfs4_client *clp)
128 {
129         return clp->cl_time == 0;
130 }
131 
132 static __be32 get_client_locked(struct nfs4_client *clp)
133 {
134         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
135 
136         lockdep_assert_held(&nn->client_lock);
137 
138         if (is_client_expired(clp))
139                 return nfserr_expired;
140         atomic_inc(&clp->cl_refcount);
141         return nfs_ok;
142 }
143 
144 /* must be called under the client_lock */
145 static inline void
146 renew_client_locked(struct nfs4_client *clp)
147 {
148         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
149 
150         if (is_client_expired(clp)) {
151                 WARN_ON(1);
152                 printk("%s: client (clientid %08x/%08x) already expired\n",
153                         __func__,
154                         clp->cl_clientid.cl_boot,
155                         clp->cl_clientid.cl_id);
156                 return;
157         }
158 
159         dprintk("renewing client (clientid %08x/%08x)\n",
160                         clp->cl_clientid.cl_boot,
161                         clp->cl_clientid.cl_id);
162         list_move_tail(&clp->cl_lru, &nn->client_lru);
163         clp->cl_time = get_seconds();
164 }
165 
166 static void put_client_renew_locked(struct nfs4_client *clp)
167 {
168         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
169 
170         lockdep_assert_held(&nn->client_lock);
171 
172         if (!atomic_dec_and_test(&clp->cl_refcount))
173                 return;
174         if (!is_client_expired(clp))
175                 renew_client_locked(clp);
176 }
177 
178 static void put_client_renew(struct nfs4_client *clp)
179 {
180         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
181 
182         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
183                 return;
184         if (!is_client_expired(clp))
185                 renew_client_locked(clp);
186         spin_unlock(&nn->client_lock);
187 }
188 
189 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
190 {
191         __be32 status;
192 
193         if (is_session_dead(ses))
194                 return nfserr_badsession;
195         status = get_client_locked(ses->se_client);
196         if (status)
197                 return status;
198         atomic_inc(&ses->se_ref);
199         return nfs_ok;
200 }
201 
202 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
203 {
204         struct nfs4_client *clp = ses->se_client;
205         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
206 
207         lockdep_assert_held(&nn->client_lock);
208 
209         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
210                 free_session(ses);
211         put_client_renew_locked(clp);
212 }
213 
214 static void nfsd4_put_session(struct nfsd4_session *ses)
215 {
216         struct nfs4_client *clp = ses->se_client;
217         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
218 
219         spin_lock(&nn->client_lock);
220         nfsd4_put_session_locked(ses);
221         spin_unlock(&nn->client_lock);
222 }
223 
224 static struct nfsd4_blocked_lock *
225 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
226                         struct nfsd_net *nn)
227 {
228         struct nfsd4_blocked_lock *cur, *found = NULL;
229 
230         spin_lock(&nn->blocked_locks_lock);
231         list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
232                 if (fh_match(fh, &cur->nbl_fh)) {
233                         list_del_init(&cur->nbl_list);
234                         list_del_init(&cur->nbl_lru);
235                         found = cur;
236                         break;
237                 }
238         }
239         spin_unlock(&nn->blocked_locks_lock);
240         if (found)
241                 posix_unblock_lock(&found->nbl_lock);
242         return found;
243 }
244 
245 static struct nfsd4_blocked_lock *
246 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
247                         struct nfsd_net *nn)
248 {
249         struct nfsd4_blocked_lock *nbl;
250 
251         nbl = find_blocked_lock(lo, fh, nn);
252         if (!nbl) {
253                 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
254                 if (nbl) {
255                         fh_copy_shallow(&nbl->nbl_fh, fh);
256                         locks_init_lock(&nbl->nbl_lock);
257                         nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
258                                         &nfsd4_cb_notify_lock_ops,
259                                         NFSPROC4_CLNT_CB_NOTIFY_LOCK);
260                 }
261         }
262         return nbl;
263 }
264 
265 static void
266 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
267 {
268         locks_release_private(&nbl->nbl_lock);
269         kfree(nbl);
270 }
271 
272 static void
273 remove_blocked_locks(struct nfs4_lockowner *lo)
274 {
275         struct nfs4_client *clp = lo->lo_owner.so_client;
276         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
277         struct nfsd4_blocked_lock *nbl;
278         LIST_HEAD(reaplist);
279 
280         /* Dequeue all blocked locks */
281         spin_lock(&nn->blocked_locks_lock);
282         while (!list_empty(&lo->lo_blocked)) {
283                 nbl = list_first_entry(&lo->lo_blocked,
284                                         struct nfsd4_blocked_lock,
285                                         nbl_list);
286                 list_del_init(&nbl->nbl_list);
287                 list_move(&nbl->nbl_lru, &reaplist);
288         }
289         spin_unlock(&nn->blocked_locks_lock);
290 
291         /* Now free them */
292         while (!list_empty(&reaplist)) {
293                 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
294                                         nbl_lru);
295                 list_del_init(&nbl->nbl_lru);
296                 posix_unblock_lock(&nbl->nbl_lock);
297                 free_blocked_lock(nbl);
298         }
299 }
300 
301 static int
302 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
303 {
304         /*
305          * Since this is just an optimization, we don't try very hard if it
306          * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
307          * just quit trying on anything else.
308          */
309         switch (task->tk_status) {
310         case -NFS4ERR_DELAY:
311                 rpc_delay(task, 1 * HZ);
312                 return 0;
313         default:
314                 return 1;
315         }
316 }
317 
318 static void
319 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
320 {
321         struct nfsd4_blocked_lock       *nbl = container_of(cb,
322                                                 struct nfsd4_blocked_lock, nbl_cb);
323 
324         free_blocked_lock(nbl);
325 }
326 
327 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
328         .done           = nfsd4_cb_notify_lock_done,
329         .release        = nfsd4_cb_notify_lock_release,
330 };
331 
332 static inline struct nfs4_stateowner *
333 nfs4_get_stateowner(struct nfs4_stateowner *sop)
334 {
335         atomic_inc(&sop->so_count);
336         return sop;
337 }
338 
339 static int
340 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
341 {
342         return (sop->so_owner.len == owner->len) &&
343                 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
344 }
345 
346 static struct nfs4_openowner *
347 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
348                         struct nfs4_client *clp)
349 {
350         struct nfs4_stateowner *so;
351 
352         lockdep_assert_held(&clp->cl_lock);
353 
354         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
355                             so_strhash) {
356                 if (!so->so_is_open_owner)
357                         continue;
358                 if (same_owner_str(so, &open->op_owner))
359                         return openowner(nfs4_get_stateowner(so));
360         }
361         return NULL;
362 }
363 
364 static struct nfs4_openowner *
365 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
366                         struct nfs4_client *clp)
367 {
368         struct nfs4_openowner *oo;
369 
370         spin_lock(&clp->cl_lock);
371         oo = find_openstateowner_str_locked(hashval, open, clp);
372         spin_unlock(&clp->cl_lock);
373         return oo;
374 }
375 
376 static inline u32
377 opaque_hashval(const void *ptr, int nbytes)
378 {
379         unsigned char *cptr = (unsigned char *) ptr;
380 
381         u32 x = 0;
382         while (nbytes--) {
383                 x *= 37;
384                 x += *cptr++;
385         }
386         return x;
387 }
388 
389 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
390 {
391         struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
392 
393         kmem_cache_free(file_slab, fp);
394 }
395 
396 void
397 put_nfs4_file(struct nfs4_file *fi)
398 {
399         might_lock(&state_lock);
400 
401         if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
402                 hlist_del_rcu(&fi->fi_hash);
403                 spin_unlock(&state_lock);
404                 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
405                 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
406                 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
407         }
408 }
409 
410 static struct file *
411 __nfs4_get_fd(struct nfs4_file *f, int oflag)
412 {
413         if (f->fi_fds[oflag])
414                 return get_file(f->fi_fds[oflag]);
415         return NULL;
416 }
417 
418 static struct file *
419 find_writeable_file_locked(struct nfs4_file *f)
420 {
421         struct file *ret;
422 
423         lockdep_assert_held(&f->fi_lock);
424 
425         ret = __nfs4_get_fd(f, O_WRONLY);
426         if (!ret)
427                 ret = __nfs4_get_fd(f, O_RDWR);
428         return ret;
429 }
430 
431 static struct file *
432 find_writeable_file(struct nfs4_file *f)
433 {
434         struct file *ret;
435 
436         spin_lock(&f->fi_lock);
437         ret = find_writeable_file_locked(f);
438         spin_unlock(&f->fi_lock);
439 
440         return ret;
441 }
442 
443 static struct file *find_readable_file_locked(struct nfs4_file *f)
444 {
445         struct file *ret;
446 
447         lockdep_assert_held(&f->fi_lock);
448 
449         ret = __nfs4_get_fd(f, O_RDONLY);
450         if (!ret)
451                 ret = __nfs4_get_fd(f, O_RDWR);
452         return ret;
453 }
454 
455 static struct file *
456 find_readable_file(struct nfs4_file *f)
457 {
458         struct file *ret;
459 
460         spin_lock(&f->fi_lock);
461         ret = find_readable_file_locked(f);
462         spin_unlock(&f->fi_lock);
463 
464         return ret;
465 }
466 
467 struct file *
468 find_any_file(struct nfs4_file *f)
469 {
470         struct file *ret;
471 
472         spin_lock(&f->fi_lock);
473         ret = __nfs4_get_fd(f, O_RDWR);
474         if (!ret) {
475                 ret = __nfs4_get_fd(f, O_WRONLY);
476                 if (!ret)
477                         ret = __nfs4_get_fd(f, O_RDONLY);
478         }
479         spin_unlock(&f->fi_lock);
480         return ret;
481 }
482 
483 static atomic_long_t num_delegations;
484 unsigned long max_delegations;
485 
486 /*
487  * Open owner state (share locks)
488  */
489 
490 /* hash tables for lock and open owners */
491 #define OWNER_HASH_BITS              8
492 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
493 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
494 
495 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
496 {
497         unsigned int ret;
498 
499         ret = opaque_hashval(ownername->data, ownername->len);
500         return ret & OWNER_HASH_MASK;
501 }
502 
503 /* hash table for nfs4_file */
504 #define FILE_HASH_BITS                   8
505 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
506 
507 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
508 {
509         return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
510 }
511 
512 static unsigned int file_hashval(struct knfsd_fh *fh)
513 {
514         return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
515 }
516 
517 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
518 
519 static void
520 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
521 {
522         lockdep_assert_held(&fp->fi_lock);
523 
524         if (access & NFS4_SHARE_ACCESS_WRITE)
525                 atomic_inc(&fp->fi_access[O_WRONLY]);
526         if (access & NFS4_SHARE_ACCESS_READ)
527                 atomic_inc(&fp->fi_access[O_RDONLY]);
528 }
529 
530 static __be32
531 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
532 {
533         lockdep_assert_held(&fp->fi_lock);
534 
535         /* Does this access mode make sense? */
536         if (access & ~NFS4_SHARE_ACCESS_BOTH)
537                 return nfserr_inval;
538 
539         /* Does it conflict with a deny mode already set? */
540         if ((access & fp->fi_share_deny) != 0)
541                 return nfserr_share_denied;
542 
543         __nfs4_file_get_access(fp, access);
544         return nfs_ok;
545 }
546 
547 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
548 {
549         /* Common case is that there is no deny mode. */
550         if (deny) {
551                 /* Does this deny mode make sense? */
552                 if (deny & ~NFS4_SHARE_DENY_BOTH)
553                         return nfserr_inval;
554 
555                 if ((deny & NFS4_SHARE_DENY_READ) &&
556                     atomic_read(&fp->fi_access[O_RDONLY]))
557                         return nfserr_share_denied;
558 
559                 if ((deny & NFS4_SHARE_DENY_WRITE) &&
560                     atomic_read(&fp->fi_access[O_WRONLY]))
561                         return nfserr_share_denied;
562         }
563         return nfs_ok;
564 }
565 
566 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
567 {
568         might_lock(&fp->fi_lock);
569 
570         if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
571                 struct file *f1 = NULL;
572                 struct file *f2 = NULL;
573 
574                 swap(f1, fp->fi_fds[oflag]);
575                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
576                         swap(f2, fp->fi_fds[O_RDWR]);
577                 spin_unlock(&fp->fi_lock);
578                 if (f1)
579                         fput(f1);
580                 if (f2)
581                         fput(f2);
582         }
583 }
584 
585 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
586 {
587         WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
588 
589         if (access & NFS4_SHARE_ACCESS_WRITE)
590                 __nfs4_file_put_access(fp, O_WRONLY);
591         if (access & NFS4_SHARE_ACCESS_READ)
592                 __nfs4_file_put_access(fp, O_RDONLY);
593 }
594 
595 /*
596  * Allocate a new open/delegation state counter. This is needed for
597  * pNFS for proper return on close semantics.
598  *
599  * Note that we only allocate it for pNFS-enabled exports, otherwise
600  * all pointers to struct nfs4_clnt_odstate are always NULL.
601  */
602 static struct nfs4_clnt_odstate *
603 alloc_clnt_odstate(struct nfs4_client *clp)
604 {
605         struct nfs4_clnt_odstate *co;
606 
607         co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
608         if (co) {
609                 co->co_client = clp;
610                 refcount_set(&co->co_odcount, 1);
611         }
612         return co;
613 }
614 
615 static void
616 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
617 {
618         struct nfs4_file *fp = co->co_file;
619 
620         lockdep_assert_held(&fp->fi_lock);
621         list_add(&co->co_perfile, &fp->fi_clnt_odstate);
622 }
623 
624 static inline void
625 get_clnt_odstate(struct nfs4_clnt_odstate *co)
626 {
627         if (co)
628                 refcount_inc(&co->co_odcount);
629 }
630 
631 static void
632 put_clnt_odstate(struct nfs4_clnt_odstate *co)
633 {
634         struct nfs4_file *fp;
635 
636         if (!co)
637                 return;
638 
639         fp = co->co_file;
640         if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
641                 list_del(&co->co_perfile);
642                 spin_unlock(&fp->fi_lock);
643 
644                 nfsd4_return_all_file_layouts(co->co_client, fp);
645                 kmem_cache_free(odstate_slab, co);
646         }
647 }
648 
649 static struct nfs4_clnt_odstate *
650 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
651 {
652         struct nfs4_clnt_odstate *co;
653         struct nfs4_client *cl;
654 
655         if (!new)
656                 return NULL;
657 
658         cl = new->co_client;
659 
660         spin_lock(&fp->fi_lock);
661         list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
662                 if (co->co_client == cl) {
663                         get_clnt_odstate(co);
664                         goto out;
665                 }
666         }
667         co = new;
668         co->co_file = fp;
669         hash_clnt_odstate_locked(new);
670 out:
671         spin_unlock(&fp->fi_lock);
672         return co;
673 }
674 
675 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
676                                   void (*sc_free)(struct nfs4_stid *))
677 {
678         struct nfs4_stid *stid;
679         int new_id;
680 
681         stid = kmem_cache_zalloc(slab, GFP_KERNEL);
682         if (!stid)
683                 return NULL;
684 
685         idr_preload(GFP_KERNEL);
686         spin_lock(&cl->cl_lock);
687         new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
688         spin_unlock(&cl->cl_lock);
689         idr_preload_end();
690         if (new_id < 0)
691                 goto out_free;
692 
693         stid->sc_free = sc_free;
694         stid->sc_client = cl;
695         stid->sc_stateid.si_opaque.so_id = new_id;
696         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
697         /* Will be incremented before return to client: */
698         refcount_set(&stid->sc_count, 1);
699         spin_lock_init(&stid->sc_lock);
700 
701         /*
702          * It shouldn't be a problem to reuse an opaque stateid value.
703          * I don't think it is for 4.1.  But with 4.0 I worry that, for
704          * example, a stray write retransmission could be accepted by
705          * the server when it should have been rejected.  Therefore,
706          * adopt a trick from the sctp code to attempt to maximize the
707          * amount of time until an id is reused, by ensuring they always
708          * "increase" (mod INT_MAX):
709          */
710         return stid;
711 out_free:
712         kmem_cache_free(slab, stid);
713         return NULL;
714 }
715 
716 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
717 {
718         struct nfs4_stid *stid;
719 
720         stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
721         if (!stid)
722                 return NULL;
723 
724         return openlockstateid(stid);
725 }
726 
727 static void nfs4_free_deleg(struct nfs4_stid *stid)
728 {
729         kmem_cache_free(deleg_slab, stid);
730         atomic_long_dec(&num_delegations);
731 }
732 
733 /*
734  * When we recall a delegation, we should be careful not to hand it
735  * out again straight away.
736  * To ensure this we keep a pair of bloom filters ('new' and 'old')
737  * in which the filehandles of recalled delegations are "stored".
738  * If a filehandle appear in either filter, a delegation is blocked.
739  * When a delegation is recalled, the filehandle is stored in the "new"
740  * filter.
741  * Every 30 seconds we swap the filters and clear the "new" one,
742  * unless both are empty of course.
743  *
744  * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
745  * low 3 bytes as hash-table indices.
746  *
747  * 'blocked_delegations_lock', which is always taken in block_delegations(),
748  * is used to manage concurrent access.  Testing does not need the lock
749  * except when swapping the two filters.
750  */
751 static DEFINE_SPINLOCK(blocked_delegations_lock);
752 static struct bloom_pair {
753         int     entries, old_entries;
754         time_t  swap_time;
755         int     new; /* index into 'set' */
756         DECLARE_BITMAP(set[2], 256);
757 } blocked_delegations;
758 
759 static int delegation_blocked(struct knfsd_fh *fh)
760 {
761         u32 hash;
762         struct bloom_pair *bd = &blocked_delegations;
763 
764         if (bd->entries == 0)
765                 return 0;
766         if (seconds_since_boot() - bd->swap_time > 30) {
767                 spin_lock(&blocked_delegations_lock);
768                 if (seconds_since_boot() - bd->swap_time > 30) {
769                         bd->entries -= bd->old_entries;
770                         bd->old_entries = bd->entries;
771                         memset(bd->set[bd->new], 0,
772                                sizeof(bd->set[0]));
773                         bd->new = 1-bd->new;
774                         bd->swap_time = seconds_since_boot();
775                 }
776                 spin_unlock(&blocked_delegations_lock);
777         }
778         hash = jhash(&fh->fh_base, fh->fh_size, 0);
779         if (test_bit(hash&255, bd->set[0]) &&
780             test_bit((hash>>8)&255, bd->set[0]) &&
781             test_bit((hash>>16)&255, bd->set[0]))
782                 return 1;
783 
784         if (test_bit(hash&255, bd->set[1]) &&
785             test_bit((hash>>8)&255, bd->set[1]) &&
786             test_bit((hash>>16)&255, bd->set[1]))
787                 return 1;
788 
789         return 0;
790 }
791 
792 static void block_delegations(struct knfsd_fh *fh)
793 {
794         u32 hash;
795         struct bloom_pair *bd = &blocked_delegations;
796 
797         hash = jhash(&fh->fh_base, fh->fh_size, 0);
798 
799         spin_lock(&blocked_delegations_lock);
800         __set_bit(hash&255, bd->set[bd->new]);
801         __set_bit((hash>>8)&255, bd->set[bd->new]);
802         __set_bit((hash>>16)&255, bd->set[bd->new]);
803         if (bd->entries == 0)
804                 bd->swap_time = seconds_since_boot();
805         bd->entries += 1;
806         spin_unlock(&blocked_delegations_lock);
807 }
808 
809 static struct nfs4_delegation *
810 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
811                  struct svc_fh *current_fh,
812                  struct nfs4_clnt_odstate *odstate)
813 {
814         struct nfs4_delegation *dp;
815         long n;
816 
817         dprintk("NFSD alloc_init_deleg\n");
818         n = atomic_long_inc_return(&num_delegations);
819         if (n < 0 || n > max_delegations)
820                 goto out_dec;
821         if (delegation_blocked(&current_fh->fh_handle))
822                 goto out_dec;
823         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
824         if (dp == NULL)
825                 goto out_dec;
826 
827         /*
828          * delegation seqid's are never incremented.  The 4.1 special
829          * meaning of seqid 0 isn't meaningful, really, but let's avoid
830          * 0 anyway just for consistency and use 1:
831          */
832         dp->dl_stid.sc_stateid.si_generation = 1;
833         INIT_LIST_HEAD(&dp->dl_perfile);
834         INIT_LIST_HEAD(&dp->dl_perclnt);
835         INIT_LIST_HEAD(&dp->dl_recall_lru);
836         dp->dl_clnt_odstate = odstate;
837         get_clnt_odstate(odstate);
838         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
839         dp->dl_retries = 1;
840         nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
841                       &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
842         get_nfs4_file(fp);
843         dp->dl_stid.sc_file = fp;
844         return dp;
845 out_dec:
846         atomic_long_dec(&num_delegations);
847         return NULL;
848 }
849 
850 void
851 nfs4_put_stid(struct nfs4_stid *s)
852 {
853         struct nfs4_file *fp = s->sc_file;
854         struct nfs4_client *clp = s->sc_client;
855 
856         might_lock(&clp->cl_lock);
857 
858         if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
859                 wake_up_all(&close_wq);
860                 return;
861         }
862         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
863         spin_unlock(&clp->cl_lock);
864         s->sc_free(s);
865         if (fp)
866                 put_nfs4_file(fp);
867 }
868 
869 void
870 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
871 {
872         stateid_t *src = &stid->sc_stateid;
873 
874         spin_lock(&stid->sc_lock);
875         if (unlikely(++src->si_generation == 0))
876                 src->si_generation = 1;
877         memcpy(dst, src, sizeof(*dst));
878         spin_unlock(&stid->sc_lock);
879 }
880 
881 static void put_deleg_file(struct nfs4_file *fp)
882 {
883         struct file *filp = NULL;
884 
885         spin_lock(&fp->fi_lock);
886         if (--fp->fi_delegees == 0)
887                 swap(filp, fp->fi_deleg_file);
888         spin_unlock(&fp->fi_lock);
889 
890         if (filp)
891                 fput(filp);
892 }
893 
894 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
895 {
896         struct nfs4_file *fp = dp->dl_stid.sc_file;
897         struct file *filp = fp->fi_deleg_file;
898 
899         WARN_ON_ONCE(!fp->fi_delegees);
900 
901         vfs_setlease(filp, F_UNLCK, NULL, (void **)&dp);
902         put_deleg_file(fp);
903 }
904 
905 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
906 {
907         put_clnt_odstate(dp->dl_clnt_odstate);
908         nfs4_unlock_deleg_lease(dp);
909         nfs4_put_stid(&dp->dl_stid);
910 }
911 
912 void nfs4_unhash_stid(struct nfs4_stid *s)
913 {
914         s->sc_type = 0;
915 }
916 
917 /**
918  * nfs4_delegation_exists - Discover if this delegation already exists
919  * @clp:     a pointer to the nfs4_client we're granting a delegation to
920  * @fp:      a pointer to the nfs4_file we're granting a delegation on
921  *
922  * Return:
923  *      On success: true iff an existing delegation is found
924  */
925 
926 static bool
927 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
928 {
929         struct nfs4_delegation *searchdp = NULL;
930         struct nfs4_client *searchclp = NULL;
931 
932         lockdep_assert_held(&state_lock);
933         lockdep_assert_held(&fp->fi_lock);
934 
935         list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
936                 searchclp = searchdp->dl_stid.sc_client;
937                 if (clp == searchclp) {
938                         return true;
939                 }
940         }
941         return false;
942 }
943 
944 /**
945  * hash_delegation_locked - Add a delegation to the appropriate lists
946  * @dp:     a pointer to the nfs4_delegation we are adding.
947  * @fp:     a pointer to the nfs4_file we're granting a delegation on
948  *
949  * Return:
950  *      On success: NULL if the delegation was successfully hashed.
951  *
952  *      On error: -EAGAIN if one was previously granted to this
953  *                 nfs4_client for this nfs4_file. Delegation is not hashed.
954  *
955  */
956 
957 static int
958 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
959 {
960         struct nfs4_client *clp = dp->dl_stid.sc_client;
961 
962         lockdep_assert_held(&state_lock);
963         lockdep_assert_held(&fp->fi_lock);
964 
965         if (nfs4_delegation_exists(clp, fp))
966                 return -EAGAIN;
967         refcount_inc(&dp->dl_stid.sc_count);
968         dp->dl_stid.sc_type = NFS4_DELEG_STID;
969         list_add(&dp->dl_perfile, &fp->fi_delegations);
970         list_add(&dp->dl_perclnt, &clp->cl_delegations);
971         return 0;
972 }
973 
974 static bool
975 unhash_delegation_locked(struct nfs4_delegation *dp)
976 {
977         struct nfs4_file *fp = dp->dl_stid.sc_file;
978 
979         lockdep_assert_held(&state_lock);
980 
981         if (list_empty(&dp->dl_perfile))
982                 return false;
983 
984         dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
985         /* Ensure that deleg break won't try to requeue it */
986         ++dp->dl_time;
987         spin_lock(&fp->fi_lock);
988         list_del_init(&dp->dl_perclnt);
989         list_del_init(&dp->dl_recall_lru);
990         list_del_init(&dp->dl_perfile);
991         spin_unlock(&fp->fi_lock);
992         return true;
993 }
994 
995 static void destroy_delegation(struct nfs4_delegation *dp)
996 {
997         bool unhashed;
998 
999         spin_lock(&state_lock);
1000         unhashed = unhash_delegation_locked(dp);
1001         spin_unlock(&state_lock);
1002         if (unhashed)
1003                 destroy_unhashed_deleg(dp);
1004 }
1005 
1006 static void revoke_delegation(struct nfs4_delegation *dp)
1007 {
1008         struct nfs4_client *clp = dp->dl_stid.sc_client;
1009 
1010         WARN_ON(!list_empty(&dp->dl_recall_lru));
1011 
1012         if (clp->cl_minorversion) {
1013                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1014                 refcount_inc(&dp->dl_stid.sc_count);
1015                 spin_lock(&clp->cl_lock);
1016                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1017                 spin_unlock(&clp->cl_lock);
1018         }
1019         destroy_unhashed_deleg(dp);
1020 }
1021 
1022 /* 
1023  * SETCLIENTID state 
1024  */
1025 
1026 static unsigned int clientid_hashval(u32 id)
1027 {
1028         return id & CLIENT_HASH_MASK;
1029 }
1030 
1031 static unsigned int clientstr_hashval(const char *name)
1032 {
1033         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
1034 }
1035 
1036 /*
1037  * We store the NONE, READ, WRITE, and BOTH bits separately in the
1038  * st_{access,deny}_bmap field of the stateid, in order to track not
1039  * only what share bits are currently in force, but also what
1040  * combinations of share bits previous opens have used.  This allows us
1041  * to enforce the recommendation of rfc 3530 14.2.19 that the server
1042  * return an error if the client attempt to downgrade to a combination
1043  * of share bits not explicable by closing some of its previous opens.
1044  *
1045  * XXX: This enforcement is actually incomplete, since we don't keep
1046  * track of access/deny bit combinations; so, e.g., we allow:
1047  *
1048  *      OPEN allow read, deny write
1049  *      OPEN allow both, deny none
1050  *      DOWNGRADE allow read, deny none
1051  *
1052  * which we should reject.
1053  */
1054 static unsigned int
1055 bmap_to_share_mode(unsigned long bmap) {
1056         int i;
1057         unsigned int access = 0;
1058 
1059         for (i = 1; i < 4; i++) {
1060                 if (test_bit(i, &bmap))
1061                         access |= i;
1062         }
1063         return access;
1064 }
1065 
1066 /* set share access for a given stateid */
1067 static inline void
1068 set_access(u32 access, struct nfs4_ol_stateid *stp)
1069 {
1070         unsigned char mask = 1 << access;
1071 
1072         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1073         stp->st_access_bmap |= mask;
1074 }
1075 
1076 /* clear share access for a given stateid */
1077 static inline void
1078 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1079 {
1080         unsigned char mask = 1 << access;
1081 
1082         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1083         stp->st_access_bmap &= ~mask;
1084 }
1085 
1086 /* test whether a given stateid has access */
1087 static inline bool
1088 test_access(u32 access, struct nfs4_ol_stateid *stp)
1089 {
1090         unsigned char mask = 1 << access;
1091 
1092         return (bool)(stp->st_access_bmap & mask);
1093 }
1094 
1095 /* set share deny for a given stateid */
1096 static inline void
1097 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1098 {
1099         unsigned char mask = 1 << deny;
1100 
1101         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1102         stp->st_deny_bmap |= mask;
1103 }
1104 
1105 /* clear share deny for a given stateid */
1106 static inline void
1107 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1108 {
1109         unsigned char mask = 1 << deny;
1110 
1111         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1112         stp->st_deny_bmap &= ~mask;
1113 }
1114 
1115 /* test whether a given stateid is denying specific access */
1116 static inline bool
1117 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1118 {
1119         unsigned char mask = 1 << deny;
1120 
1121         return (bool)(stp->st_deny_bmap & mask);
1122 }
1123 
1124 static int nfs4_access_to_omode(u32 access)
1125 {
1126         switch (access & NFS4_SHARE_ACCESS_BOTH) {
1127         case NFS4_SHARE_ACCESS_READ:
1128                 return O_RDONLY;
1129         case NFS4_SHARE_ACCESS_WRITE:
1130                 return O_WRONLY;
1131         case NFS4_SHARE_ACCESS_BOTH:
1132                 return O_RDWR;
1133         }
1134         WARN_ON_ONCE(1);
1135         return O_RDONLY;
1136 }
1137 
1138 /*
1139  * A stateid that had a deny mode associated with it is being released
1140  * or downgraded. Recalculate the deny mode on the file.
1141  */
1142 static void
1143 recalculate_deny_mode(struct nfs4_file *fp)
1144 {
1145         struct nfs4_ol_stateid *stp;
1146 
1147         spin_lock(&fp->fi_lock);
1148         fp->fi_share_deny = 0;
1149         list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1150                 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1151         spin_unlock(&fp->fi_lock);
1152 }
1153 
1154 static void
1155 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1156 {
1157         int i;
1158         bool change = false;
1159 
1160         for (i = 1; i < 4; i++) {
1161                 if ((i & deny) != i) {
1162                         change = true;
1163                         clear_deny(i, stp);
1164                 }
1165         }
1166 
1167         /* Recalculate per-file deny mode if there was a change */
1168         if (change)
1169                 recalculate_deny_mode(stp->st_stid.sc_file);
1170 }
1171 
1172 /* release all access and file references for a given stateid */
1173 static void
1174 release_all_access(struct nfs4_ol_stateid *stp)
1175 {
1176         int i;
1177         struct nfs4_file *fp = stp->st_stid.sc_file;
1178 
1179         if (fp && stp->st_deny_bmap != 0)
1180                 recalculate_deny_mode(fp);
1181 
1182         for (i = 1; i < 4; i++) {
1183                 if (test_access(i, stp))
1184                         nfs4_file_put_access(stp->st_stid.sc_file, i);
1185                 clear_access(i, stp);
1186         }
1187 }
1188 
1189 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1190 {
1191         kfree(sop->so_owner.data);
1192         sop->so_ops->so_free(sop);
1193 }
1194 
1195 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1196 {
1197         struct nfs4_client *clp = sop->so_client;
1198 
1199         might_lock(&clp->cl_lock);
1200 
1201         if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1202                 return;
1203         sop->so_ops->so_unhash(sop);
1204         spin_unlock(&clp->cl_lock);
1205         nfs4_free_stateowner(sop);
1206 }
1207 
1208 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1209 {
1210         struct nfs4_file *fp = stp->st_stid.sc_file;
1211 
1212         lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1213 
1214         if (list_empty(&stp->st_perfile))
1215                 return false;
1216 
1217         spin_lock(&fp->fi_lock);
1218         list_del_init(&stp->st_perfile);
1219         spin_unlock(&fp->fi_lock);
1220         list_del(&stp->st_perstateowner);
1221         return true;
1222 }
1223 
1224 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1225 {
1226         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1227 
1228         put_clnt_odstate(stp->st_clnt_odstate);
1229         release_all_access(stp);
1230         if (stp->st_stateowner)
1231                 nfs4_put_stateowner(stp->st_stateowner);
1232         kmem_cache_free(stateid_slab, stid);
1233 }
1234 
1235 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1236 {
1237         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1238         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1239         struct file *file;
1240 
1241         file = find_any_file(stp->st_stid.sc_file);
1242         if (file)
1243                 filp_close(file, (fl_owner_t)lo);
1244         nfs4_free_ol_stateid(stid);
1245 }
1246 
1247 /*
1248  * Put the persistent reference to an already unhashed generic stateid, while
1249  * holding the cl_lock. If it's the last reference, then put it onto the
1250  * reaplist for later destruction.
1251  */
1252 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1253                                        struct list_head *reaplist)
1254 {
1255         struct nfs4_stid *s = &stp->st_stid;
1256         struct nfs4_client *clp = s->sc_client;
1257 
1258         lockdep_assert_held(&clp->cl_lock);
1259 
1260         WARN_ON_ONCE(!list_empty(&stp->st_locks));
1261 
1262         if (!refcount_dec_and_test(&s->sc_count)) {
1263                 wake_up_all(&close_wq);
1264                 return;
1265         }
1266 
1267         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1268         list_add(&stp->st_locks, reaplist);
1269 }
1270 
1271 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1272 {
1273         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1274 
1275         list_del_init(&stp->st_locks);
1276         nfs4_unhash_stid(&stp->st_stid);
1277         return unhash_ol_stateid(stp);
1278 }
1279 
1280 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1281 {
1282         struct nfs4_client *clp = stp->st_stid.sc_client;
1283         bool unhashed;
1284 
1285         spin_lock(&clp->cl_lock);
1286         unhashed = unhash_lock_stateid(stp);
1287         spin_unlock(&clp->cl_lock);
1288         if (unhashed)
1289                 nfs4_put_stid(&stp->st_stid);
1290 }
1291 
1292 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1293 {
1294         struct nfs4_client *clp = lo->lo_owner.so_client;
1295 
1296         lockdep_assert_held(&clp->cl_lock);
1297 
1298         list_del_init(&lo->lo_owner.so_strhash);
1299 }
1300 
1301 /*
1302  * Free a list of generic stateids that were collected earlier after being
1303  * fully unhashed.
1304  */
1305 static void
1306 free_ol_stateid_reaplist(struct list_head *reaplist)
1307 {
1308         struct nfs4_ol_stateid *stp;
1309         struct nfs4_file *fp;
1310 
1311         might_sleep();
1312 
1313         while (!list_empty(reaplist)) {
1314                 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1315                                        st_locks);
1316                 list_del(&stp->st_locks);
1317                 fp = stp->st_stid.sc_file;
1318                 stp->st_stid.sc_free(&stp->st_stid);
1319                 if (fp)
1320                         put_nfs4_file(fp);
1321         }
1322 }
1323 
1324 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1325                                        struct list_head *reaplist)
1326 {
1327         struct nfs4_ol_stateid *stp;
1328 
1329         lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1330 
1331         while (!list_empty(&open_stp->st_locks)) {
1332                 stp = list_entry(open_stp->st_locks.next,
1333                                 struct nfs4_ol_stateid, st_locks);
1334                 WARN_ON(!unhash_lock_stateid(stp));
1335                 put_ol_stateid_locked(stp, reaplist);
1336         }
1337 }
1338 
1339 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1340                                 struct list_head *reaplist)
1341 {
1342         bool unhashed;
1343 
1344         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1345 
1346         unhashed = unhash_ol_stateid(stp);
1347         release_open_stateid_locks(stp, reaplist);
1348         return unhashed;
1349 }
1350 
1351 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1352 {
1353         LIST_HEAD(reaplist);
1354 
1355         spin_lock(&stp->st_stid.sc_client->cl_lock);
1356         if (unhash_open_stateid(stp, &reaplist))
1357                 put_ol_stateid_locked(stp, &reaplist);
1358         spin_unlock(&stp->st_stid.sc_client->cl_lock);
1359         free_ol_stateid_reaplist(&reaplist);
1360 }
1361 
1362 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1363 {
1364         struct nfs4_client *clp = oo->oo_owner.so_client;
1365 
1366         lockdep_assert_held(&clp->cl_lock);
1367 
1368         list_del_init(&oo->oo_owner.so_strhash);
1369         list_del_init(&oo->oo_perclient);
1370 }
1371 
1372 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1373 {
1374         struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1375                                           nfsd_net_id);
1376         struct nfs4_ol_stateid *s;
1377 
1378         spin_lock(&nn->client_lock);
1379         s = oo->oo_last_closed_stid;
1380         if (s) {
1381                 list_del_init(&oo->oo_close_lru);
1382                 oo->oo_last_closed_stid = NULL;
1383         }
1384         spin_unlock(&nn->client_lock);
1385         if (s)
1386                 nfs4_put_stid(&s->st_stid);
1387 }
1388 
1389 static void release_openowner(struct nfs4_openowner *oo)
1390 {
1391         struct nfs4_ol_stateid *stp;
1392         struct nfs4_client *clp = oo->oo_owner.so_client;
1393         struct list_head reaplist;
1394 
1395         INIT_LIST_HEAD(&reaplist);
1396 
1397         spin_lock(&clp->cl_lock);
1398         unhash_openowner_locked(oo);
1399         while (!list_empty(&oo->oo_owner.so_stateids)) {
1400                 stp = list_first_entry(&oo->oo_owner.so_stateids,
1401                                 struct nfs4_ol_stateid, st_perstateowner);
1402                 if (unhash_open_stateid(stp, &reaplist))
1403                         put_ol_stateid_locked(stp, &reaplist);
1404         }
1405         spin_unlock(&clp->cl_lock);
1406         free_ol_stateid_reaplist(&reaplist);
1407         release_last_closed_stateid(oo);
1408         nfs4_put_stateowner(&oo->oo_owner);
1409 }
1410 
1411 static inline int
1412 hash_sessionid(struct nfs4_sessionid *sessionid)
1413 {
1414         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1415 
1416         return sid->sequence % SESSION_HASH_SIZE;
1417 }
1418 
1419 #ifdef CONFIG_SUNRPC_DEBUG
1420 static inline void
1421 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1422 {
1423         u32 *ptr = (u32 *)(&sessionid->data[0]);
1424         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1425 }
1426 #else
1427 static inline void
1428 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1429 {
1430 }
1431 #endif
1432 
1433 /*
1434  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1435  * won't be used for replay.
1436  */
1437 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1438 {
1439         struct nfs4_stateowner *so = cstate->replay_owner;
1440 
1441         if (nfserr == nfserr_replay_me)
1442                 return;
1443 
1444         if (!seqid_mutating_err(ntohl(nfserr))) {
1445                 nfsd4_cstate_clear_replay(cstate);
1446                 return;
1447         }
1448         if (!so)
1449                 return;
1450         if (so->so_is_open_owner)
1451                 release_last_closed_stateid(openowner(so));
1452         so->so_seqid++;
1453         return;
1454 }
1455 
1456 static void
1457 gen_sessionid(struct nfsd4_session *ses)
1458 {
1459         struct nfs4_client *clp = ses->se_client;
1460         struct nfsd4_sessionid *sid;
1461 
1462         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1463         sid->clientid = clp->cl_clientid;
1464         sid->sequence = current_sessionid++;
1465         sid->reserved = 0;
1466 }
1467 
1468 /*
1469  * The protocol defines ca_maxresponssize_cached to include the size of
1470  * the rpc header, but all we need to cache is the data starting after
1471  * the end of the initial SEQUENCE operation--the rest we regenerate
1472  * each time.  Therefore we can advertise a ca_maxresponssize_cached
1473  * value that is the number of bytes in our cache plus a few additional
1474  * bytes.  In order to stay on the safe side, and not promise more than
1475  * we can cache, those additional bytes must be the minimum possible: 24
1476  * bytes of rpc header (xid through accept state, with AUTH_NULL
1477  * verifier), 12 for the compound header (with zero-length tag), and 44
1478  * for the SEQUENCE op response:
1479  */
1480 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
1481 
1482 static void
1483 free_session_slots(struct nfsd4_session *ses)
1484 {
1485         int i;
1486 
1487         for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1488                 free_svc_cred(&ses->se_slots[i]->sl_cred);
1489                 kfree(ses->se_slots[i]);
1490         }
1491 }
1492 
1493 /*
1494  * We don't actually need to cache the rpc and session headers, so we
1495  * can allocate a little less for each slot:
1496  */
1497 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1498 {
1499         u32 size;
1500 
1501         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1502                 size = 0;
1503         else
1504                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1505         return size + sizeof(struct nfsd4_slot);
1506 }
1507 
1508 /*
1509  * XXX: If we run out of reserved DRC memory we could (up to a point)
1510  * re-negotiate active sessions and reduce their slot usage to make
1511  * room for new connections. For now we just fail the create session.
1512  */
1513 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1514 {
1515         u32 slotsize = slot_bytes(ca);
1516         u32 num = ca->maxreqs;
1517         int avail;
1518 
1519         spin_lock(&nfsd_drc_lock);
1520         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1521                     nfsd_drc_max_mem - nfsd_drc_mem_used);
1522         /*
1523          * Never use more than a third of the remaining memory,
1524          * unless it's the only way to give this client a slot:
1525          */
1526         avail = clamp_t(int, avail, slotsize, avail/3);
1527         num = min_t(int, num, avail / slotsize);
1528         nfsd_drc_mem_used += num * slotsize;
1529         spin_unlock(&nfsd_drc_lock);
1530 
1531         return num;
1532 }
1533 
1534 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1535 {
1536         int slotsize = slot_bytes(ca);
1537 
1538         spin_lock(&nfsd_drc_lock);
1539         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1540         spin_unlock(&nfsd_drc_lock);
1541 }
1542 
1543 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1544                                            struct nfsd4_channel_attrs *battrs)
1545 {
1546         int numslots = fattrs->maxreqs;
1547         int slotsize = slot_bytes(fattrs);
1548         struct nfsd4_session *new;
1549         int mem, i;
1550 
1551         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1552                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
1553         mem = numslots * sizeof(struct nfsd4_slot *);
1554 
1555         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1556         if (!new)
1557                 return NULL;
1558         /* allocate each struct nfsd4_slot and data cache in one piece */
1559         for (i = 0; i < numslots; i++) {
1560                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1561                 if (!new->se_slots[i])
1562                         goto out_free;
1563         }
1564 
1565         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1566         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1567 
1568         return new;
1569 out_free:
1570         while (i--)
1571                 kfree(new->se_slots[i]);
1572         kfree(new);
1573         return NULL;
1574 }
1575 
1576 static void free_conn(struct nfsd4_conn *c)
1577 {
1578         svc_xprt_put(c->cn_xprt);
1579         kfree(c);
1580 }
1581 
1582 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1583 {
1584         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1585         struct nfs4_client *clp = c->cn_session->se_client;
1586 
1587         spin_lock(&clp->cl_lock);
1588         if (!list_empty(&c->cn_persession)) {
1589                 list_del(&c->cn_persession);
1590                 free_conn(c);
1591         }
1592         nfsd4_probe_callback(clp);
1593         spin_unlock(&clp->cl_lock);
1594 }
1595 
1596 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1597 {
1598         struct nfsd4_conn *conn;
1599 
1600         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1601         if (!conn)
1602                 return NULL;
1603         svc_xprt_get(rqstp->rq_xprt);
1604         conn->cn_xprt = rqstp->rq_xprt;
1605         conn->cn_flags = flags;
1606         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1607         return conn;
1608 }
1609 
1610 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1611 {
1612         conn->cn_session = ses;
1613         list_add(&conn->cn_persession, &ses->se_conns);
1614 }
1615 
1616 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1617 {
1618         struct nfs4_client *clp = ses->se_client;
1619 
1620         spin_lock(&clp->cl_lock);
1621         __nfsd4_hash_conn(conn, ses);
1622         spin_unlock(&clp->cl_lock);
1623 }
1624 
1625 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1626 {
1627         conn->cn_xpt_user.callback = nfsd4_conn_lost;
1628         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1629 }
1630 
1631 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1632 {
1633         int ret;
1634 
1635         nfsd4_hash_conn(conn, ses);
1636         ret = nfsd4_register_conn(conn);
1637         if (ret)
1638                 /* oops; xprt is already down: */
1639                 nfsd4_conn_lost(&conn->cn_xpt_user);
1640         /* We may have gained or lost a callback channel: */
1641         nfsd4_probe_callback_sync(ses->se_client);
1642 }
1643 
1644 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1645 {
1646         u32 dir = NFS4_CDFC4_FORE;
1647 
1648         if (cses->flags & SESSION4_BACK_CHAN)
1649                 dir |= NFS4_CDFC4_BACK;
1650         return alloc_conn(rqstp, dir);
1651 }
1652 
1653 /* must be called under client_lock */
1654 static void nfsd4_del_conns(struct nfsd4_session *s)
1655 {
1656         struct nfs4_client *clp = s->se_client;
1657         struct nfsd4_conn *c;
1658 
1659         spin_lock(&clp->cl_lock);
1660         while (!list_empty(&s->se_conns)) {
1661                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1662                 list_del_init(&c->cn_persession);
1663                 spin_unlock(&clp->cl_lock);
1664 
1665                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1666                 free_conn(c);
1667 
1668                 spin_lock(&clp->cl_lock);
1669         }
1670         spin_unlock(&clp->cl_lock);
1671 }
1672 
1673 static void __free_session(struct nfsd4_session *ses)
1674 {
1675         free_session_slots(ses);
1676         kfree(ses);
1677 }
1678 
1679 static void free_session(struct nfsd4_session *ses)
1680 {
1681         nfsd4_del_conns(ses);
1682         nfsd4_put_drc_mem(&ses->se_fchannel);
1683         __free_session(ses);
1684 }
1685 
1686 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1687 {
1688         int idx;
1689         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1690 
1691         new->se_client = clp;
1692         gen_sessionid(new);
1693 
1694         INIT_LIST_HEAD(&new->se_conns);
1695 
1696         new->se_cb_seq_nr = 1;
1697         new->se_flags = cses->flags;
1698         new->se_cb_prog = cses->callback_prog;
1699         new->se_cb_sec = cses->cb_sec;
1700         atomic_set(&new->se_ref, 0);
1701         idx = hash_sessionid(&new->se_sessionid);
1702         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1703         spin_lock(&clp->cl_lock);
1704         list_add(&new->se_perclnt, &clp->cl_sessions);
1705         spin_unlock(&clp->cl_lock);
1706 
1707         {
1708                 struct sockaddr *sa = svc_addr(rqstp);
1709                 /*
1710                  * This is a little silly; with sessions there's no real
1711                  * use for the callback address.  Use the peer address
1712                  * as a reasonable default for now, but consider fixing
1713                  * the rpc client not to require an address in the
1714                  * future:
1715                  */
1716                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1717                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1718         }
1719 }
1720 
1721 /* caller must hold client_lock */
1722 static struct nfsd4_session *
1723 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1724 {
1725         struct nfsd4_session *elem;
1726         int idx;
1727         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1728 
1729         lockdep_assert_held(&nn->client_lock);
1730 
1731         dump_sessionid(__func__, sessionid);
1732         idx = hash_sessionid(sessionid);
1733         /* Search in the appropriate list */
1734         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1735                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1736                             NFS4_MAX_SESSIONID_LEN)) {
1737                         return elem;
1738                 }
1739         }
1740 
1741         dprintk("%s: session not found\n", __func__);
1742         return NULL;
1743 }
1744 
1745 static struct nfsd4_session *
1746 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1747                 __be32 *ret)
1748 {
1749         struct nfsd4_session *session;
1750         __be32 status = nfserr_badsession;
1751 
1752         session = __find_in_sessionid_hashtbl(sessionid, net);
1753         if (!session)
1754                 goto out;
1755         status = nfsd4_get_session_locked(session);
1756         if (status)
1757                 session = NULL;
1758 out:
1759         *ret = status;
1760         return session;
1761 }
1762 
1763 /* caller must hold client_lock */
1764 static void
1765 unhash_session(struct nfsd4_session *ses)
1766 {
1767         struct nfs4_client *clp = ses->se_client;
1768         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1769 
1770         lockdep_assert_held(&nn->client_lock);
1771 
1772         list_del(&ses->se_hash);
1773         spin_lock(&ses->se_client->cl_lock);
1774         list_del(&ses->se_perclnt);
1775         spin_unlock(&ses->se_client->cl_lock);
1776 }
1777 
1778 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1779 static int
1780 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1781 {
1782         /*
1783          * We're assuming the clid was not given out from a boot
1784          * precisely 2^32 (about 136 years) before this one.  That seems
1785          * a safe assumption:
1786          */
1787         if (clid->cl_boot == (u32)nn->boot_time)
1788                 return 0;
1789         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1790                 clid->cl_boot, clid->cl_id, nn->boot_time);
1791         return 1;
1792 }
1793 
1794 /* 
1795  * XXX Should we use a slab cache ?
1796  * This type of memory management is somewhat inefficient, but we use it
1797  * anyway since SETCLIENTID is not a common operation.
1798  */
1799 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1800 {
1801         struct nfs4_client *clp;
1802         int i;
1803 
1804         clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
1805         if (clp == NULL)
1806                 return NULL;
1807         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1808         if (clp->cl_name.data == NULL)
1809                 goto err_no_name;
1810         clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
1811                                                  sizeof(struct list_head),
1812                                                  GFP_KERNEL);
1813         if (!clp->cl_ownerstr_hashtbl)
1814                 goto err_no_hashtbl;
1815         for (i = 0; i < OWNER_HASH_SIZE; i++)
1816                 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1817         clp->cl_name.len = name.len;
1818         INIT_LIST_HEAD(&clp->cl_sessions);
1819         idr_init(&clp->cl_stateids);
1820         atomic_set(&clp->cl_refcount, 0);
1821         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1822         INIT_LIST_HEAD(&clp->cl_idhash);
1823         INIT_LIST_HEAD(&clp->cl_openowners);
1824         INIT_LIST_HEAD(&clp->cl_delegations);
1825         INIT_LIST_HEAD(&clp->cl_lru);
1826         INIT_LIST_HEAD(&clp->cl_revoked);
1827 #ifdef CONFIG_NFSD_PNFS
1828         INIT_LIST_HEAD(&clp->cl_lo_states);
1829 #endif
1830         spin_lock_init(&clp->cl_lock);
1831         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1832         return clp;
1833 err_no_hashtbl:
1834         kfree(clp->cl_name.data);
1835 err_no_name:
1836         kmem_cache_free(client_slab, clp);
1837         return NULL;
1838 }
1839 
1840 static void
1841 free_client(struct nfs4_client *clp)
1842 {
1843         while (!list_empty(&clp->cl_sessions)) {
1844                 struct nfsd4_session *ses;
1845                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1846                                 se_perclnt);
1847                 list_del(&ses->se_perclnt);
1848                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1849                 free_session(ses);
1850         }
1851         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1852         free_svc_cred(&clp->cl_cred);
1853         kfree(clp->cl_ownerstr_hashtbl);
1854         kfree(clp->cl_name.data);
1855         idr_destroy(&clp->cl_stateids);
1856         kmem_cache_free(client_slab, clp);
1857 }
1858 
1859 /* must be called under the client_lock */
1860 static void
1861 unhash_client_locked(struct nfs4_client *clp)
1862 {
1863         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1864         struct nfsd4_session *ses;
1865 
1866         lockdep_assert_held(&nn->client_lock);
1867 
1868         /* Mark the client as expired! */
1869         clp->cl_time = 0;
1870         /* Make it invisible */
1871         if (!list_empty(&clp->cl_idhash)) {
1872                 list_del_init(&clp->cl_idhash);
1873                 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1874                         rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1875                 else
1876                         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1877         }
1878         list_del_init(&clp->cl_lru);
1879         spin_lock(&clp->cl_lock);
1880         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1881                 list_del_init(&ses->se_hash);
1882         spin_unlock(&clp->cl_lock);
1883 }
1884 
1885 static void
1886 unhash_client(struct nfs4_client *clp)
1887 {
1888         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1889 
1890         spin_lock(&nn->client_lock);
1891         unhash_client_locked(clp);
1892         spin_unlock(&nn->client_lock);
1893 }
1894 
1895 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1896 {
1897         if (atomic_read(&clp->cl_refcount))
1898                 return nfserr_jukebox;
1899         unhash_client_locked(clp);
1900         return nfs_ok;
1901 }
1902 
1903 static void
1904 __destroy_client(struct nfs4_client *clp)
1905 {
1906         int i;
1907         struct nfs4_openowner *oo;
1908         struct nfs4_delegation *dp;
1909         struct list_head reaplist;
1910 
1911         INIT_LIST_HEAD(&reaplist);
1912         spin_lock(&state_lock);
1913         while (!list_empty(&clp->cl_delegations)) {
1914                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1915                 WARN_ON(!unhash_delegation_locked(dp));
1916                 list_add(&dp->dl_recall_lru, &reaplist);
1917         }
1918         spin_unlock(&state_lock);
1919         while (!list_empty(&reaplist)) {
1920                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1921                 list_del_init(&dp->dl_recall_lru);
1922                 destroy_unhashed_deleg(dp);
1923         }
1924         while (!list_empty(&clp->cl_revoked)) {
1925                 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
1926                 list_del_init(&dp->dl_recall_lru);
1927                 nfs4_put_stid(&dp->dl_stid);
1928         }
1929         while (!list_empty(&clp->cl_openowners)) {
1930                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1931                 nfs4_get_stateowner(&oo->oo_owner);
1932                 release_openowner(oo);
1933         }
1934         for (i = 0; i < OWNER_HASH_SIZE; i++) {
1935                 struct nfs4_stateowner *so, *tmp;
1936 
1937                 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
1938                                          so_strhash) {
1939                         /* Should be no openowners at this point */
1940                         WARN_ON_ONCE(so->so_is_open_owner);
1941                         remove_blocked_locks(lockowner(so));
1942                 }
1943         }
1944         nfsd4_return_all_client_layouts(clp);
1945         nfsd4_shutdown_callback(clp);
1946         if (clp->cl_cb_conn.cb_xprt)
1947                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1948         free_client(clp);
1949 }
1950 
1951 static void
1952 destroy_client(struct nfs4_client *clp)
1953 {
1954         unhash_client(clp);
1955         __destroy_client(clp);
1956 }
1957 
1958 static void expire_client(struct nfs4_client *clp)
1959 {
1960         unhash_client(clp);
1961         nfsd4_client_record_remove(clp);
1962         __destroy_client(clp);
1963 }
1964 
1965 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1966 {
1967         memcpy(target->cl_verifier.data, source->data,
1968                         sizeof(target->cl_verifier.data));
1969 }
1970 
1971 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1972 {
1973         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1974         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1975 }
1976 
1977 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1978 {
1979         target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
1980         target->cr_raw_principal = kstrdup(source->cr_raw_principal,
1981                                                                 GFP_KERNEL);
1982         if ((source->cr_principal && ! target->cr_principal) ||
1983             (source->cr_raw_principal && ! target->cr_raw_principal))
1984                 return -ENOMEM;
1985 
1986         target->cr_flavor = source->cr_flavor;
1987         target->cr_uid = source->cr_uid;
1988         target->cr_gid = source->cr_gid;
1989         target->cr_group_info = source->cr_group_info;
1990         get_group_info(target->cr_group_info);
1991         target->cr_gss_mech = source->cr_gss_mech;
1992         if (source->cr_gss_mech)
1993                 gss_mech_get(source->cr_gss_mech);
1994         return 0;
1995 }
1996 
1997 static int
1998 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1999 {
2000         if (o1->len < o2->len)
2001                 return -1;
2002         if (o1->len > o2->len)
2003                 return 1;
2004         return memcmp(o1->data, o2->data, o1->len);
2005 }
2006 
2007 static int same_name(const char *n1, const char *n2)
2008 {
2009         return 0 == memcmp(n1, n2, HEXDIR_LEN);
2010 }
2011 
2012 static int
2013 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2014 {
2015         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2016 }
2017 
2018 static int
2019 same_clid(clientid_t *cl1, clientid_t *cl2)
2020 {
2021         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2022 }
2023 
2024 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2025 {
2026         int i;
2027 
2028         if (g1->ngroups != g2->ngroups)
2029                 return false;
2030         for (i=0; i<g1->ngroups; i++)
2031                 if (!gid_eq(g1->gid[i], g2->gid[i]))
2032                         return false;
2033         return true;
2034 }
2035 
2036 /*
2037  * RFC 3530 language requires clid_inuse be returned when the
2038  * "principal" associated with a requests differs from that previously
2039  * used.  We use uid, gid's, and gss principal string as our best
2040  * approximation.  We also don't want to allow non-gss use of a client
2041  * established using gss: in theory cr_principal should catch that
2042  * change, but in practice cr_principal can be null even in the gss case
2043  * since gssd doesn't always pass down a principal string.
2044  */
2045 static bool is_gss_cred(struct svc_cred *cr)
2046 {
2047         /* Is cr_flavor one of the gss "pseudoflavors"?: */
2048         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2049 }
2050 
2051 
2052 static bool
2053 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2054 {
2055         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2056                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2057                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2058                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2059                 return false;
2060         if (cr1->cr_principal == cr2->cr_principal)
2061                 return true;
2062         if (!cr1->cr_principal || !cr2->cr_principal)
2063                 return false;
2064         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2065 }
2066 
2067 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2068 {
2069         struct svc_cred *cr = &rqstp->rq_cred;
2070         u32 service;
2071 
2072         if (!cr->cr_gss_mech)
2073                 return false;
2074         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2075         return service == RPC_GSS_SVC_INTEGRITY ||
2076                service == RPC_GSS_SVC_PRIVACY;
2077 }
2078 
2079 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2080 {
2081         struct svc_cred *cr = &rqstp->rq_cred;
2082 
2083         if (!cl->cl_mach_cred)
2084                 return true;
2085         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2086                 return false;
2087         if (!svc_rqst_integrity_protected(rqstp))
2088                 return false;
2089         if (cl->cl_cred.cr_raw_principal)
2090                 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2091                                                 cr->cr_raw_principal);
2092         if (!cr->cr_principal)
2093                 return false;
2094         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2095 }
2096 
2097 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2098 {
2099         __be32 verf[2];
2100 
2101         /*
2102          * This is opaque to client, so no need to byte-swap. Use
2103          * __force to keep sparse happy
2104          */
2105         verf[0] = (__force __be32)get_seconds();
2106         verf[1] = (__force __be32)nn->clverifier_counter++;
2107         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2108 }
2109 
2110 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2111 {
2112         clp->cl_clientid.cl_boot = nn->boot_time;
2113         clp->cl_clientid.cl_id = nn->clientid_counter++;
2114         gen_confirm(clp, nn);
2115 }
2116 
2117 static struct nfs4_stid *
2118 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2119 {
2120         struct nfs4_stid *ret;
2121 
2122         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2123         if (!ret || !ret->sc_type)
2124                 return NULL;
2125         return ret;
2126 }
2127 
2128 static struct nfs4_stid *
2129 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2130 {
2131         struct nfs4_stid *s;
2132 
2133         spin_lock(&cl->cl_lock);
2134         s = find_stateid_locked(cl, t);
2135         if (s != NULL) {
2136                 if (typemask & s->sc_type)
2137                         refcount_inc(&s->sc_count);
2138                 else
2139                         s = NULL;
2140         }
2141         spin_unlock(&cl->cl_lock);
2142         return s;
2143 }
2144 
2145 static struct nfs4_client *create_client(struct xdr_netobj name,
2146                 struct svc_rqst *rqstp, nfs4_verifier *verf)
2147 {
2148         struct nfs4_client *clp;
2149         struct sockaddr *sa = svc_addr(rqstp);
2150         int ret;
2151         struct net *net = SVC_NET(rqstp);
2152 
2153         clp = alloc_client(name);
2154         if (clp == NULL)
2155                 return NULL;
2156 
2157         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2158         if (ret) {
2159                 free_client(clp);
2160                 return NULL;
2161         }
2162         nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2163         clp->cl_time = get_seconds();
2164         clear_bit(0, &clp->cl_cb_slot_busy);
2165         copy_verf(clp, verf);
2166         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
2167         clp->cl_cb_session = NULL;
2168         clp->net = net;
2169         return clp;
2170 }
2171 
2172 static void
2173 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2174 {
2175         struct rb_node **new = &(root->rb_node), *parent = NULL;
2176         struct nfs4_client *clp;
2177 
2178         while (*new) {
2179                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2180                 parent = *new;
2181 
2182                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2183                         new = &((*new)->rb_left);
2184                 else
2185                         new = &((*new)->rb_right);
2186         }
2187 
2188         rb_link_node(&new_clp->cl_namenode, parent, new);
2189         rb_insert_color(&new_clp->cl_namenode, root);
2190 }
2191 
2192 static struct nfs4_client *
2193 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2194 {
2195         int cmp;
2196         struct rb_node *node = root->rb_node;
2197         struct nfs4_client *clp;
2198 
2199         while (node) {
2200                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2201                 cmp = compare_blob(&clp->cl_name, name);
2202                 if (cmp > 0)
2203                         node = node->rb_left;
2204                 else if (cmp < 0)
2205                         node = node->rb_right;
2206                 else
2207                         return clp;
2208         }
2209         return NULL;
2210 }
2211 
2212 static void
2213 add_to_unconfirmed(struct nfs4_client *clp)
2214 {
2215         unsigned int idhashval;
2216         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2217 
2218         lockdep_assert_held(&nn->client_lock);
2219 
2220         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2221         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2222         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2223         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2224         renew_client_locked(clp);
2225 }
2226 
2227 static void
2228 move_to_confirmed(struct nfs4_client *clp)
2229 {
2230         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2231         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2232 
2233         lockdep_assert_held(&nn->client_lock);
2234 
2235         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2236         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2237         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2238         add_clp_to_name_tree(clp, &nn->conf_name_tree);
2239         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2240         renew_client_locked(clp);
2241 }
2242 
2243 static struct nfs4_client *
2244 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2245 {
2246         struct nfs4_client *clp;
2247         unsigned int idhashval = clientid_hashval(clid->cl_id);
2248 
2249         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2250                 if (same_clid(&clp->cl_clientid, clid)) {
2251                         if ((bool)clp->cl_minorversion != sessions)
2252                                 return NULL;
2253                         renew_client_locked(clp);
2254                         return clp;
2255                 }
2256         }
2257         return NULL;
2258 }
2259 
2260 static struct nfs4_client *
2261 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2262 {
2263         struct list_head *tbl = nn->conf_id_hashtbl;
2264 
2265         lockdep_assert_held(&nn->client_lock);
2266         return find_client_in_id_table(tbl, clid, sessions);
2267 }
2268 
2269 static struct nfs4_client *
2270 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2271 {
2272         struct list_head *tbl = nn->unconf_id_hashtbl;
2273 
2274         lockdep_assert_held(&nn->client_lock);
2275         return find_client_in_id_table(tbl, clid, sessions);
2276 }
2277 
2278 static bool clp_used_exchangeid(struct nfs4_client *clp)
2279 {
2280         return clp->cl_exchange_flags != 0;
2281 } 
2282 
2283 static struct nfs4_client *
2284 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2285 {
2286         lockdep_assert_held(&nn->client_lock);
2287         return find_clp_in_name_tree(name, &nn->conf_name_tree);
2288 }
2289 
2290 static struct nfs4_client *
2291 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2292 {
2293         lockdep_assert_held(&nn->client_lock);
2294         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2295 }
2296 
2297 static void
2298 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2299 {
2300         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2301         struct sockaddr *sa = svc_addr(rqstp);
2302         u32 scopeid = rpc_get_scope_id(sa);
2303         unsigned short expected_family;
2304 
2305         /* Currently, we only support tcp and tcp6 for the callback channel */
2306         if (se->se_callback_netid_len == 3 &&
2307             !memcmp(se->se_callback_netid_val, "tcp", 3))
2308                 expected_family = AF_INET;
2309         else if (se->se_callback_netid_len == 4 &&
2310                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
2311                 expected_family = AF_INET6;
2312         else
2313                 goto out_err;
2314 
2315         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2316                                             se->se_callback_addr_len,
2317                                             (struct sockaddr *)&conn->cb_addr,
2318                                             sizeof(conn->cb_addr));
2319 
2320         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2321                 goto out_err;
2322 
2323         if (conn->cb_addr.ss_family == AF_INET6)
2324                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2325 
2326         conn->cb_prog = se->se_callback_prog;
2327         conn->cb_ident = se->se_callback_ident;
2328         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2329         return;
2330 out_err:
2331         conn->cb_addr.ss_family = AF_UNSPEC;
2332         conn->cb_addrlen = 0;
2333         dprintk("NFSD: this client (clientid %08x/%08x) "
2334                 "will not receive delegations\n",
2335                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2336 
2337         return;
2338 }
2339 
2340 /*
2341  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2342  */
2343 static void
2344 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2345 {
2346         struct xdr_buf *buf = resp->xdr.buf;
2347         struct nfsd4_slot *slot = resp->cstate.slot;
2348         unsigned int base;
2349 
2350         dprintk("--> %s slot %p\n", __func__, slot);
2351 
2352         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2353         slot->sl_opcnt = resp->opcnt;
2354         slot->sl_status = resp->cstate.status;
2355         free_svc_cred(&slot->sl_cred);
2356         copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2357 
2358         if (!nfsd4_cache_this(resp)) {
2359                 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2360                 return;
2361         }
2362         slot->sl_flags |= NFSD4_SLOT_CACHED;
2363 
2364         base = resp->cstate.data_offset;
2365         slot->sl_datalen = buf->len - base;
2366         if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2367                 WARN(1, "%s: sessions DRC could not cache compound\n",
2368                      __func__);
2369         return;
2370 }
2371 
2372 /*
2373  * Encode the replay sequence operation from the slot values.
2374  * If cachethis is FALSE encode the uncached rep error on the next
2375  * operation which sets resp->p and increments resp->opcnt for
2376  * nfs4svc_encode_compoundres.
2377  *
2378  */
2379 static __be32
2380 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2381                           struct nfsd4_compoundres *resp)
2382 {
2383         struct nfsd4_op *op;
2384         struct nfsd4_slot *slot = resp->cstate.slot;
2385 
2386         /* Encode the replayed sequence operation */
2387         op = &args->ops[resp->opcnt - 1];
2388         nfsd4_encode_operation(resp, op);
2389 
2390         if (slot->sl_flags & NFSD4_SLOT_CACHED)
2391                 return op->status;
2392         if (args->opcnt == 1) {
2393                 /*
2394                  * The original operation wasn't a solo sequence--we
2395                  * always cache those--so this retry must not match the
2396                  * original:
2397                  */
2398                 op->status = nfserr_seq_false_retry;
2399         } else {
2400                 op = &args->ops[resp->opcnt++];
2401                 op->status = nfserr_retry_uncached_rep;
2402                 nfsd4_encode_operation(resp, op);
2403         }
2404         return op->status;
2405 }
2406 
2407 /*
2408  * The sequence operation is not cached because we can use the slot and
2409  * session values.
2410  */
2411 static __be32
2412 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2413                          struct nfsd4_sequence *seq)
2414 {
2415         struct nfsd4_slot *slot = resp->cstate.slot;
2416         struct xdr_stream *xdr = &resp->xdr;
2417         __be32 *p;
2418         __be32 status;
2419 
2420         dprintk("--> %s slot %p\n", __func__, slot);
2421 
2422         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2423         if (status)
2424                 return status;
2425 
2426         p = xdr_reserve_space(xdr, slot->sl_datalen);
2427         if (!p) {
2428                 WARN_ON_ONCE(1);
2429                 return nfserr_serverfault;
2430         }
2431         xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2432         xdr_commit_encode(xdr);
2433 
2434         resp->opcnt = slot->sl_opcnt;
2435         return slot->sl_status;
2436 }
2437 
2438 /*
2439  * Set the exchange_id flags returned by the server.
2440  */
2441 static void
2442 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2443 {
2444 #ifdef CONFIG_NFSD_PNFS
2445         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2446 #else
2447         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2448 #endif
2449 
2450         /* Referrals are supported, Migration is not. */
2451         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2452 
2453         /* set the wire flags to return to client. */
2454         clid->flags = new->cl_exchange_flags;
2455 }
2456 
2457 static bool client_has_openowners(struct nfs4_client *clp)
2458 {
2459         struct nfs4_openowner *oo;
2460 
2461         list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2462                 if (!list_empty(&oo->oo_owner.so_stateids))
2463                         return true;
2464         }
2465         return false;
2466 }
2467 
2468 static bool client_has_state(struct nfs4_client *clp)
2469 {
2470         return client_has_openowners(clp)
2471 #ifdef CONFIG_NFSD_PNFS
2472                 || !list_empty(&clp->cl_lo_states)
2473 #endif
2474                 || !list_empty(&clp->cl_delegations)
2475                 || !list_empty(&clp->cl_sessions);
2476 }
2477 
2478 __be32
2479 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2480                 union nfsd4_op_u *u)
2481 {
2482         struct nfsd4_exchange_id *exid = &u->exchange_id;
2483         struct nfs4_client *conf, *new;
2484         struct nfs4_client *unconf = NULL;
2485         __be32 status;
2486         char                    addr_str[INET6_ADDRSTRLEN];
2487         nfs4_verifier           verf = exid->verifier;
2488         struct sockaddr         *sa = svc_addr(rqstp);
2489         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2490         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2491 
2492         rpc_ntop(sa, addr_str, sizeof(addr_str));
2493         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2494                 "ip_addr=%s flags %x, spa_how %d\n",
2495                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2496                 addr_str, exid->flags, exid->spa_how);
2497 
2498         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2499                 return nfserr_inval;
2500 
2501         new = create_client(exid->clname, rqstp, &verf);
2502         if (new == NULL)
2503                 return nfserr_jukebox;
2504 
2505         switch (exid->spa_how) {
2506         case SP4_MACH_CRED:
2507                 exid->spo_must_enforce[0] = 0;
2508                 exid->spo_must_enforce[1] = (
2509                         1 << (OP_BIND_CONN_TO_SESSION - 32) |
2510                         1 << (OP_EXCHANGE_ID - 32) |
2511                         1 << (OP_CREATE_SESSION - 32) |
2512                         1 << (OP_DESTROY_SESSION - 32) |
2513                         1 << (OP_DESTROY_CLIENTID - 32));
2514 
2515                 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
2516                                         1 << (OP_OPEN_DOWNGRADE) |
2517                                         1 << (OP_LOCKU) |
2518                                         1 << (OP_DELEGRETURN));
2519 
2520                 exid->spo_must_allow[1] &= (
2521                                         1 << (OP_TEST_STATEID - 32) |
2522                                         1 << (OP_FREE_STATEID - 32));
2523                 if (!svc_rqst_integrity_protected(rqstp)) {
2524                         status = nfserr_inval;
2525                         goto out_nolock;
2526                 }
2527                 /*
2528                  * Sometimes userspace doesn't give us a principal.
2529                  * Which is a bug, really.  Anyway, we can't enforce
2530                  * MACH_CRED in that case, better to give up now:
2531                  */
2532                 if (!new->cl_cred.cr_principal &&
2533                                         !new->cl_cred.cr_raw_principal) {
2534                         status = nfserr_serverfault;
2535                         goto out_nolock;
2536                 }
2537                 new->cl_mach_cred = true;
2538         case SP4_NONE:
2539                 break;
2540         default:                                /* checked by xdr code */
2541                 WARN_ON_ONCE(1);
2542         case SP4_SSV:
2543                 status = nfserr_encr_alg_unsupp;
2544                 goto out_nolock;
2545         }
2546 
2547         /* Cases below refer to rfc 5661 section 18.35.4: */
2548         spin_lock(&nn->client_lock);
2549         conf = find_confirmed_client_by_name(&exid->clname, nn);
2550         if (conf) {
2551                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2552                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2553 
2554                 if (update) {
2555                         if (!clp_used_exchangeid(conf)) { /* buggy client */
2556                                 status = nfserr_inval;
2557                                 goto out;
2558                         }
2559                         if (!nfsd4_mach_creds_match(conf, rqstp)) {
2560                                 status = nfserr_wrong_cred;
2561                                 goto out;
2562                         }
2563                         if (!creds_match) { /* case 9 */
2564                                 status = nfserr_perm;
2565                                 goto out;
2566                         }
2567                         if (!verfs_match) { /* case 8 */
2568                                 status = nfserr_not_same;
2569                                 goto out;
2570                         }
2571                         /* case 6 */
2572                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2573                         goto out_copy;
2574                 }
2575                 if (!creds_match) { /* case 3 */
2576                         if (client_has_state(conf)) {
2577                                 status = nfserr_clid_inuse;
2578                                 goto out;
2579                         }
2580                         goto out_new;
2581                 }
2582                 if (verfs_match) { /* case 2 */
2583                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2584                         goto out_copy;
2585                 }
2586                 /* case 5, client reboot */
2587                 conf = NULL;
2588                 goto out_new;
2589         }
2590 
2591         if (update) { /* case 7 */
2592                 status = nfserr_noent;
2593                 goto out;
2594         }
2595 
2596         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
2597         if (unconf) /* case 4, possible retry or client restart */
2598                 unhash_client_locked(unconf);
2599 
2600         /* case 1 (normal case) */
2601 out_new:
2602         if (conf) {
2603                 status = mark_client_expired_locked(conf);
2604                 if (status)
2605                         goto out;
2606         }
2607         new->cl_minorversion = cstate->minorversion;
2608         new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
2609         new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
2610 
2611         gen_clid(new, nn);
2612         add_to_unconfirmed(new);
2613         swap(new, conf);
2614 out_copy:
2615         exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2616         exid->clientid.cl_id = conf->cl_clientid.cl_id;
2617 
2618         exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2619         nfsd4_set_ex_flags(conf, exid);
2620 
2621         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2622                 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2623         status = nfs_ok;
2624 
2625 out:
2626         spin_unlock(&nn->client_lock);
2627 out_nolock:
2628         if (new)
2629                 expire_client(new);
2630         if (unconf)
2631                 expire_client(unconf);
2632         return status;
2633 }
2634 
2635 static __be32
2636 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2637 {
2638         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2639                 slot_seqid);
2640 
2641         /* The slot is in use, and no response has been sent. */
2642         if (slot_inuse) {
2643                 if (seqid == slot_seqid)
2644                         return nfserr_jukebox;
2645                 else
2646                         return nfserr_seq_misordered;
2647         }
2648         /* Note unsigned 32-bit arithmetic handles wraparound: */
2649         if (likely(seqid == slot_seqid + 1))
2650                 return nfs_ok;
2651         if (seqid == slot_seqid)
2652                 return nfserr_replay_cache;
2653         return nfserr_seq_misordered;
2654 }
2655 
2656 /*
2657  * Cache the create session result into the create session single DRC
2658  * slot cache by saving the xdr structure. sl_seqid has been set.
2659  * Do this for solo or embedded create session operations.
2660  */
2661 static void
2662 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2663                            struct nfsd4_clid_slot *slot, __be32 nfserr)
2664 {
2665         slot->sl_status = nfserr;
2666         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2667 }
2668 
2669 static __be32
2670 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2671                             struct nfsd4_clid_slot *slot)
2672 {
2673         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2674         return slot->sl_status;
2675 }
2676 
2677 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2678                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2679                         1 +     /* MIN tag is length with zero, only length */ \
2680                         3 +     /* version, opcount, opcode */ \
2681                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2682                                 /* seqid, slotID, slotID, cache */ \
2683                         4 ) * sizeof(__be32))
2684 
2685 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2686                         2 +     /* verifier: AUTH_NULL, length 0 */\
2687                         1 +     /* status */ \
2688                         1 +     /* MIN tag is length with zero, only length */ \
2689                         3 +     /* opcount, opcode, opstatus*/ \
2690                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2691                                 /* seqid, slotID, slotID, slotID, status */ \
2692                         5 ) * sizeof(__be32))
2693 
2694 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2695 {
2696         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2697 
2698         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2699                 return nfserr_toosmall;
2700         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2701                 return nfserr_toosmall;
2702         ca->headerpadsz = 0;
2703         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2704         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2705         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2706         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2707                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2708         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2709         /*
2710          * Note decreasing slot size below client's request may make it
2711          * difficult for client to function correctly, whereas
2712          * decreasing the number of slots will (just?) affect
2713          * performance.  When short on memory we therefore prefer to
2714          * decrease number of slots instead of their size.  Clients that
2715          * request larger slots than they need will get poor results:
2716          */
2717         ca->maxreqs = nfsd4_get_drc_mem(ca);
2718         if (!ca->maxreqs)
2719                 return nfserr_jukebox;
2720 
2721         return nfs_ok;
2722 }
2723 
2724 /*
2725  * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2726  * These are based on similar macros in linux/sunrpc/msg_prot.h .
2727  */
2728 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2729         (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2730 
2731 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2732         (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2733 
2734 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
2735                                  RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2736 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
2737                                  RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2738                                  sizeof(__be32))
2739 
2740 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2741 {
2742         ca->headerpadsz = 0;
2743 
2744         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2745                 return nfserr_toosmall;
2746         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2747                 return nfserr_toosmall;
2748         ca->maxresp_cached = 0;
2749         if (ca->maxops < 2)
2750                 return nfserr_toosmall;
2751 
2752         return nfs_ok;
2753 }
2754 
2755 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2756 {
2757         switch (cbs->flavor) {
2758         case RPC_AUTH_NULL:
2759         case RPC_AUTH_UNIX:
2760                 return nfs_ok;
2761         default:
2762                 /*
2763                  * GSS case: the spec doesn't allow us to return this
2764                  * error.  But it also doesn't allow us not to support
2765                  * GSS.
2766                  * I'd rather this fail hard than return some error the
2767                  * client might think it can already handle:
2768                  */
2769                 return nfserr_encr_alg_unsupp;
2770         }
2771 }
2772 
2773 __be32
2774 nfsd4_create_session(struct svc_rqst *rqstp,
2775                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2776 {
2777         struct nfsd4_create_session *cr_ses = &u->create_session;
2778         struct sockaddr *sa = svc_addr(rqstp);
2779         struct nfs4_client *conf, *unconf;
2780         struct nfs4_client *old = NULL;
2781         struct nfsd4_session *new;
2782         struct nfsd4_conn *conn;
2783         struct nfsd4_clid_slot *cs_slot = NULL;
2784         __be32 status = 0;
2785         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2786 
2787         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2788                 return nfserr_inval;
2789         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2790         if (status)
2791                 return status;
2792         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2793         if (status)
2794                 return status;
2795         status = check_backchannel_attrs(&cr_ses->back_channel);
2796         if (status)
2797                 goto out_release_drc_mem;
2798         status = nfserr_jukebox;
2799         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2800         if (!new)
2801                 goto out_release_drc_mem;
2802         conn = alloc_conn_from_crses(rqstp, cr_ses);
2803         if (!conn)
2804                 goto out_free_session;
2805 
2806         spin_lock(&nn->client_lock);
2807         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2808         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2809         WARN_ON_ONCE(conf && unconf);
2810 
2811         if (conf) {
2812                 status = nfserr_wrong_cred;
2813                 if (!nfsd4_mach_creds_match(conf, rqstp))
2814                         goto out_free_conn;
2815                 cs_slot = &conf->cl_cs_slot;
2816                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2817                 if (status) {
2818                         if (status == nfserr_replay_cache)
2819                                 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2820                         goto out_free_conn;
2821                 }
2822         } else if (unconf) {
2823                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2824                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2825                         status = nfserr_clid_inuse;
2826                         goto out_free_conn;
2827                 }
2828                 status = nfserr_wrong_cred;
2829                 if (!nfsd4_mach_creds_match(unconf, rqstp))
2830                         goto out_free_conn;
2831                 cs_slot = &unconf->cl_cs_slot;
2832                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2833                 if (status) {
2834                         /* an unconfirmed replay returns misordered */
2835                         status = nfserr_seq_misordered;
2836                         goto out_free_conn;
2837                 }
2838                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2839                 if (old) {
2840                         status = mark_client_expired_locked(old);
2841                         if (status) {
2842                                 old = NULL;
2843                                 goto out_free_conn;
2844                         }
2845                 }
2846                 move_to_confirmed(unconf);
2847                 conf = unconf;
2848         } else {
2849                 status = nfserr_stale_clientid;
2850                 goto out_free_conn;
2851         }
2852         status = nfs_ok;
2853         /* Persistent sessions are not supported */
2854         cr_ses->flags &= ~SESSION4_PERSIST;
2855         /* Upshifting from TCP to RDMA is not supported */
2856         cr_ses->flags &= ~SESSION4_RDMA;
2857 
2858         init_session(rqstp, new, conf, cr_ses);
2859         nfsd4_get_session_locked(new);
2860 
2861         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2862                NFS4_MAX_SESSIONID_LEN);
2863         cs_slot->sl_seqid++;
2864         cr_ses->seqid = cs_slot->sl_seqid;
2865 
2866         /* cache solo and embedded create sessions under the client_lock */
2867         nfsd4_cache_create_session(cr_ses, cs_slot, status);
2868         spin_unlock(&nn->client_lock);
2869         /* init connection and backchannel */
2870         nfsd4_init_conn(rqstp, conn, new);
2871         nfsd4_put_session(new);
2872         if (old)
2873                 expire_client(old);
2874         return status;
2875 out_free_conn:
2876         spin_unlock(&nn->client_lock);
2877         free_conn(conn);
2878         if (old)
2879                 expire_client(old);
2880 out_free_session:
2881         __free_session(new);
2882 out_release_drc_mem:
2883         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2884         return status;
2885 }
2886 
2887 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2888 {
2889         switch (*dir) {
2890         case NFS4_CDFC4_FORE:
2891         case NFS4_CDFC4_BACK:
2892                 return nfs_ok;
2893         case NFS4_CDFC4_FORE_OR_BOTH:
2894         case NFS4_CDFC4_BACK_OR_BOTH:
2895                 *dir = NFS4_CDFC4_BOTH;
2896                 return nfs_ok;
2897         };
2898         return nfserr_inval;
2899 }
2900 
2901 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
2902                 struct nfsd4_compound_state *cstate,
2903                 union nfsd4_op_u *u)
2904 {
2905         struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
2906         struct nfsd4_session *session = cstate->session;
2907         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2908         __be32 status;
2909 
2910         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2911         if (status)
2912                 return status;
2913         spin_lock(&nn->client_lock);
2914         session->se_cb_prog = bc->bc_cb_program;
2915         session->se_cb_sec = bc->bc_cb_sec;
2916         spin_unlock(&nn->client_lock);
2917 
2918         nfsd4_probe_callback(session->se_client);
2919 
2920         return nfs_ok;
2921 }
2922 
2923 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2924                      struct nfsd4_compound_state *cstate,
2925                      union nfsd4_op_u *u)
2926 {
2927         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
2928         __be32 status;
2929         struct nfsd4_conn *conn;
2930         struct nfsd4_session *session;
2931         struct net *net = SVC_NET(rqstp);
2932         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2933 
2934         if (!nfsd4_last_compound_op(rqstp))
2935                 return nfserr_not_only_op;
2936         spin_lock(&nn->client_lock);
2937         session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2938         spin_unlock(&nn->client_lock);
2939         if (!session)
2940                 goto out_no_session;
2941         status = nfserr_wrong_cred;
2942         if (!nfsd4_mach_creds_match(session->se_client, rqstp))
2943                 goto out;
2944         status = nfsd4_map_bcts_dir(&bcts->dir);
2945         if (status)
2946                 goto out;
2947         conn = alloc_conn(rqstp, bcts->dir);
2948         status = nfserr_jukebox;
2949         if (!conn)
2950                 goto out;
2951         nfsd4_init_conn(rqstp, conn, session);
2952         status = nfs_ok;
2953 out:
2954         nfsd4_put_session(session);
2955 out_no_session:
2956         return status;
2957 }
2958 
2959 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2960 {
2961         if (!session)
2962                 return false;
2963         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2964 }
2965 
2966 __be32
2967 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
2968                 union nfsd4_op_u *u)
2969 {
2970         struct nfsd4_destroy_session *sessionid = &u->destroy_session;
2971         struct nfsd4_session *ses;
2972         __be32 status;
2973         int ref_held_by_me = 0;
2974         struct net *net = SVC_NET(r);
2975         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2976 
2977         status = nfserr_not_only_op;
2978         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2979                 if (!nfsd4_last_compound_op(r))
2980                         goto out;
2981                 ref_held_by_me++;
2982         }
2983         dump_sessionid(__func__, &sessionid->sessionid);
2984         spin_lock(&nn->client_lock);
2985         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2986         if (!ses)
2987                 goto out_client_lock;
2988         status = nfserr_wrong_cred;
2989         if (!nfsd4_mach_creds_match(ses->se_client, r))
2990                 goto out_put_session;
2991         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2992         if (status)
2993                 goto out_put_session;
2994         unhash_session(ses);
2995         spin_unlock(&nn->client_lock);
2996 
2997         nfsd4_probe_callback_sync(ses->se_client);
2998 
2999         spin_lock(&nn->client_lock);
3000         status = nfs_ok;
3001 out_put_session:
3002         nfsd4_put_session_locked(ses);
3003 out_client_lock:
3004         spin_unlock(&nn->client_lock);
3005 out:
3006         return status;
3007 }
3008 
3009 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3010 {
3011         struct nfsd4_conn *c;
3012 
3013         list_for_each_entry(c, &s->se_conns, cn_persession) {
3014                 if (c->cn_xprt == xpt) {
3015                         return c;
3016                 }
3017         }
3018         return NULL;
3019 }
3020 
3021 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3022 {
3023         struct nfs4_client *clp = ses->se_client;
3024         struct nfsd4_conn *c;
3025         __be32 status = nfs_ok;
3026         int ret;
3027 
3028         spin_lock(&clp->cl_lock);
3029         c = __nfsd4_find_conn(new->cn_xprt, ses);
3030         if (c)
3031                 goto out_free;
3032         status = nfserr_conn_not_bound_to_session;
3033         if (clp->cl_mach_cred)
3034                 goto out_free;
3035         __nfsd4_hash_conn(new, ses);
3036         spin_unlock(&clp->cl_lock);
3037         ret = nfsd4_register_conn(new);
3038         if (ret)
3039                 /* oops; xprt is already down: */
3040                 nfsd4_conn_lost(&new->cn_xpt_user);
3041         return nfs_ok;
3042 out_free:
3043         spin_unlock(&clp->cl_lock);
3044         free_conn(new);
3045         return status;
3046 }
3047 
3048 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3049 {
3050         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3051 
3052         return args->opcnt > session->se_fchannel.maxops;
3053 }
3054 
3055 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3056                                   struct nfsd4_session *session)
3057 {
3058         struct xdr_buf *xb = &rqstp->rq_arg;
3059 
3060         return xb->len > session->se_fchannel.maxreq_sz;
3061 }
3062 
3063 static bool replay_matches_cache(struct svc_rqst *rqstp,
3064                  struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3065 {
3066         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3067 
3068         if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3069             (bool)seq->cachethis)
3070                 return false;
3071         /*
3072          * If there's an error than the reply can have fewer ops than
3073          * the call.  But if we cached a reply with *more* ops than the
3074          * call you're sending us now, then this new call is clearly not
3075          * really a replay of the old one:
3076          */
3077         if (slot->sl_opcnt < argp->opcnt)
3078                 return false;
3079         /* This is the only check explicitly called by spec: */
3080         if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3081                 return false;
3082         /*
3083          * There may be more comparisons we could actually do, but the
3084          * spec doesn't require us to catch every case where the calls
3085          * don't match (that would require caching the call as well as
3086          * the reply), so we don't bother.
3087          */
3088         return true;
3089 }
3090 
3091 __be32
3092 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3093                 union nfsd4_op_u *u)
3094 {
3095         struct nfsd4_sequence *seq = &u->sequence;
3096         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3097         struct xdr_stream *xdr = &resp->xdr;
3098         struct nfsd4_session *session;
3099         struct nfs4_client *clp;
3100         struct nfsd4_slot *slot;
3101         struct nfsd4_conn *conn;
3102         __be32 status;
3103         int buflen;
3104         struct net *net = SVC_NET(rqstp);
3105         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3106 
3107         if (resp->opcnt != 1)
3108                 return nfserr_sequence_pos;
3109 
3110         /*
3111          * Will be either used or freed by nfsd4_sequence_check_conn
3112          * below.
3113          */
3114         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3115         if (!conn)
3116                 return nfserr_jukebox;
3117 
3118         spin_lock(&nn->client_lock);
3119         session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3120         if (!session)
3121                 goto out_no_session;
3122         clp = session->se_client;
3123 
3124         status = nfserr_too_many_ops;
3125         if (nfsd4_session_too_many_ops(rqstp, session))
3126                 goto out_put_session;
3127 
3128         status = nfserr_req_too_big;
3129         if (nfsd4_request_too_big(rqstp, session))
3130                 goto out_put_session;
3131 
3132         status = nfserr_badslot;
3133         if (seq->slotid >= session->se_fchannel.maxreqs)
3134                 goto out_put_session;
3135 
3136         slot = session->se_slots[seq->slotid];
3137         dprintk("%s: slotid %d\n", __func__, seq->slotid);
3138 
3139         /* We do not negotiate the number of slots yet, so set the
3140          * maxslots to the session maxreqs which is used to encode
3141          * sr_highest_slotid and the sr_target_slot id to maxslots */
3142         seq->maxslots = session->se_fchannel.maxreqs;
3143 
3144         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3145                                         slot->sl_flags & NFSD4_SLOT_INUSE);
3146         if (status == nfserr_replay_cache) {
3147                 status = nfserr_seq_misordered;
3148                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3149                         goto out_put_session;
3150                 status = nfserr_seq_false_retry;
3151                 if (!replay_matches_cache(rqstp, seq, slot))
3152                         goto out_put_session;
3153                 cstate->slot = slot;
3154                 cstate->session = session;
3155                 cstate->clp = clp;
3156                 /* Return the cached reply status and set cstate->status
3157                  * for nfsd4_proc_compound processing */
3158                 status = nfsd4_replay_cache_entry(resp, seq);
3159                 cstate->status = nfserr_replay_cache;
3160                 goto out;
3161         }
3162         if (status)
3163                 goto out_put_session;
3164 
3165         status = nfsd4_sequence_check_conn(conn, session);
3166         conn = NULL;
3167         if (status)
3168                 goto out_put_session;
3169 
3170         buflen = (seq->cachethis) ?
3171                         session->se_fchannel.maxresp_cached :
3172                         session->se_fchannel.maxresp_sz;
3173         status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3174                                     nfserr_rep_too_big;
3175         if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3176                 goto out_put_session;
3177         svc_reserve(rqstp, buflen);
3178 
3179         status = nfs_ok;
3180         /* Success! bump slot seqid */
3181         slot->sl_seqid = seq->seqid;
3182         slot->sl_flags |= NFSD4_SLOT_INUSE;
3183         if (seq->cachethis)
3184                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3185         else
3186                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3187 
3188         cstate->slot = slot;
3189         cstate->session = session;
3190         cstate->clp = clp;
3191 
3192 out:
3193         switch (clp->cl_cb_state) {
3194         case NFSD4_CB_DOWN:
3195                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3196                 break;
3197         case NFSD4_CB_FAULT:
3198                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3199                 break;
3200         default:
3201                 seq->status_flags = 0;
3202         }
3203         if (!list_empty(&clp->cl_revoked))
3204                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3205 out_no_session:
3206         if (conn)
3207                 free_conn(conn);
3208         spin_unlock(&nn->client_lock);
3209         return status;
3210 out_put_session:
3211         nfsd4_put_session_locked(session);
3212         goto out_no_session;
3213 }
3214 
3215 void
3216 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3217 {
3218         struct nfsd4_compound_state *cs = &resp->cstate;
3219 
3220         if (nfsd4_has_session(cs)) {
3221                 if (cs->status != nfserr_replay_cache) {
3222                         nfsd4_store_cache_entry(resp);
3223                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3224                 }
3225                 /* Drop session reference that was taken in nfsd4_sequence() */
3226                 nfsd4_put_session(cs->session);
3227         } else if (cs->clp)
3228                 put_client_renew(cs->clp);
3229 }
3230 
3231 __be32
3232 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3233                 struct nfsd4_compound_state *cstate,
3234                 union nfsd4_op_u *u)
3235 {
3236         struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3237         struct nfs4_client *conf, *unconf;
3238         struct nfs4_client *clp = NULL;
3239         __be32 status = 0;
3240         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3241 
3242         spin_lock(&nn->client_lock);
3243         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3244         conf = find_confirmed_client(&dc->clientid, true, nn);
3245         WARN_ON_ONCE(conf && unconf);
3246 
3247         if (conf) {
3248                 if (client_has_state(conf)) {
3249                         status = nfserr_clientid_busy;
3250                         goto out;
3251                 }
3252                 status = mark_client_expired_locked(conf);
3253                 if (status)
3254                         goto out;
3255                 clp = conf;
3256         } else if (unconf)
3257                 clp = unconf;
3258         else {
3259                 status = nfserr_stale_clientid;
3260                 goto out;
3261         }
3262         if (!nfsd4_mach_creds_match(clp, rqstp)) {
3263                 clp = NULL;
3264                 status = nfserr_wrong_cred;
3265                 goto out;
3266         }
3267         unhash_client_locked(clp);
3268 out:
3269         spin_unlock(&nn->client_lock);
3270         if (clp)
3271                 expire_client(clp);
3272         return status;
3273 }
3274 
3275 __be32
3276 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3277                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3278 {
3279         struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3280         __be32 status = 0;
3281 
3282         if (rc->rca_one_fs) {
3283                 if (!cstate->current_fh.fh_dentry)
3284                         return nfserr_nofilehandle;
3285                 /*
3286                  * We don't take advantage of the rca_one_fs case.
3287                  * That's OK, it's optional, we can safely ignore it.
3288                  */
3289                 return nfs_ok;
3290         }
3291 
3292         status = nfserr_complete_already;
3293         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3294                              &cstate->session->se_client->cl_flags))
3295                 goto out;
3296 
3297         status = nfserr_stale_clientid;
3298         if (is_client_expired(cstate->session->se_client))
3299                 /*
3300                  * The following error isn't really legal.
3301                  * But we only get here if the client just explicitly
3302                  * destroyed the client.  Surely it no longer cares what
3303                  * error it gets back on an operation for the dead
3304                  * client.
3305                  */
3306                 goto out;
3307 
3308         status = nfs_ok;
3309         nfsd4_client_record_create(cstate->session->se_client);
3310 out:
3311         return status;
3312 }
3313 
3314 __be32
3315 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3316                   union nfsd4_op_u *u)
3317 {
3318         struct nfsd4_setclientid *setclid = &u->setclientid;
3319         struct xdr_netobj       clname = setclid->se_name;
3320         nfs4_verifier           clverifier = setclid->se_verf;
3321         struct nfs4_client      *conf, *new;
3322         struct nfs4_client      *unconf = NULL;
3323         __be32                  status;
3324         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3325 
3326         new = create_client(clname, rqstp, &clverifier);
3327         if (new == NULL)
3328                 return nfserr_jukebox;
3329         /* Cases below refer to rfc 3530 section 14.2.33: */
3330         spin_lock(&nn->client_lock);
3331         conf = find_confirmed_client_by_name(&clname, nn);
3332         if (conf && client_has_state(conf)) {
3333                 /* case 0: */
3334                 status = nfserr_clid_inuse;
3335                 if (clp_used_exchangeid(conf))
3336                         goto out;
3337                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3338                         char addr_str[INET6_ADDRSTRLEN];
3339                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3340                                  sizeof(addr_str));
3341                         dprintk("NFSD: setclientid: string in use by client "
3342                                 "at %s\n", addr_str);
3343                         goto out;
3344                 }
3345         }
3346         unconf = find_unconfirmed_client_by_name(&clname, nn);
3347         if (unconf)
3348                 unhash_client_locked(unconf);
3349         if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3350                 /* case 1: probable callback update */
3351                 copy_clid(new, conf);
3352                 gen_confirm(new, nn);
3353         } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3354                 gen_clid(new, nn);
3355         new->cl_minorversion = 0;
3356         gen_callback(new, setclid, rqstp);
3357         add_to_unconfirmed(new);
3358         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3359         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3360         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3361         new = NULL;
3362         status = nfs_ok;
3363 out:
3364         spin_unlock(&nn->client_lock);
3365         if (new)
3366                 free_client(new);
3367         if (unconf)
3368                 expire_client(unconf);
3369         return status;
3370 }
3371 
3372 
3373 __be32
3374 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3375                         struct nfsd4_compound_state *cstate,
3376                         union nfsd4_op_u *u)
3377 {
3378         struct nfsd4_setclientid_confirm *setclientid_confirm =
3379                         &u->setclientid_confirm;
3380         struct nfs4_client *conf, *unconf;
3381         struct nfs4_client *old = NULL;
3382         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
3383         clientid_t * clid = &setclientid_confirm->sc_clientid;
3384         __be32 status;
3385         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3386 
3387         if (STALE_CLIENTID(clid, nn))
3388                 return nfserr_stale_clientid;
3389 
3390         spin_lock(&nn->client_lock);
3391         conf = find_confirmed_client(clid, false, nn);
3392         unconf = find_unconfirmed_client(clid, false, nn);
3393         /*
3394          * We try hard to give out unique clientid's, so if we get an
3395          * attempt to confirm the same clientid with a different cred,
3396          * the client may be buggy; this should never happen.
3397          *
3398          * Nevertheless, RFC 7530 recommends INUSE for this case:
3399          */
3400         status = nfserr_clid_inuse;
3401         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3402                 goto out;
3403         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3404                 goto out;
3405         /* cases below refer to rfc 3530 section 14.2.34: */
3406         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3407                 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3408                         /* case 2: probable retransmit */
3409                         status = nfs_ok;
3410                 } else /* case 4: client hasn't noticed we rebooted yet? */
3411                         status = nfserr_stale_clientid;
3412                 goto out;
3413         }
3414         status = nfs_ok;
3415         if (conf) { /* case 1: callback update */
3416                 old = unconf;
3417                 unhash_client_locked(old);
3418                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3419         } else { /* case 3: normal case; new or rebooted client */
3420                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3421                 if (old) {
3422                         status = nfserr_clid_inuse;
3423                         if (client_has_state(old)
3424                                         && !same_creds(&unconf->cl_cred,
3425                                                         &old->cl_cred))
3426                                 goto out;
3427                         status = mark_client_expired_locked(old);
3428                         if (status) {
3429                                 old = NULL;
3430                                 goto out;
3431                         }
3432                 }
3433                 move_to_confirmed(unconf);
3434                 conf = unconf;
3435         }
3436         get_client_locked(conf);
3437         spin_unlock(&nn->client_lock);
3438         nfsd4_probe_callback(conf);
3439         spin_lock(&nn->client_lock);
3440         put_client_renew_locked(conf);
3441 out:
3442         spin_unlock(&nn->client_lock);
3443         if (old)
3444                 expire_client(old);
3445         return status;
3446 }
3447 
3448 static struct nfs4_file *nfsd4_alloc_file(void)
3449 {
3450         return kmem_cache_alloc(file_slab, GFP_KERNEL);
3451 }
3452 
3453 /* OPEN Share state helper functions */
3454 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3455                                 struct nfs4_file *fp)
3456 {
3457         lockdep_assert_held(&state_lock);
3458 
3459         refcount_set(&fp->fi_ref, 1);
3460         spin_lock_init(&fp->fi_lock);
3461         INIT_LIST_HEAD(&fp->fi_stateids);
3462         INIT_LIST_HEAD(&fp->fi_delegations);
3463         INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3464         fh_copy_shallow(&fp->fi_fhandle, fh);
3465         fp->fi_deleg_file = NULL;
3466         fp->fi_had_conflict = false;
3467         fp->fi_share_deny = 0;
3468         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3469         memset(fp->fi_access, 0, sizeof(fp->fi_access));
3470 #ifdef CONFIG_NFSD_PNFS
3471         INIT_LIST_HEAD(&fp->fi_lo_states);
3472         atomic_set(&fp->fi_lo_recalls, 0);
3473 #endif
3474         hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3475 }
3476 
3477 void
3478 nfsd4_free_slabs(void)
3479 {
3480         kmem_cache_destroy(client_slab);
3481         kmem_cache_destroy(openowner_slab);
3482         kmem_cache_destroy(lockowner_slab);
3483         kmem_cache_destroy(file_slab);
3484         kmem_cache_destroy(stateid_slab);
3485         kmem_cache_destroy(deleg_slab);
3486         kmem_cache_destroy(odstate_slab);
3487 }
3488 
3489 int
3490 nfsd4_init_slabs(void)
3491 {
3492         client_slab = kmem_cache_create("nfsd4_clients",
3493                         sizeof(struct nfs4_client), 0, 0, NULL);
3494         if (client_slab == NULL)
3495                 goto out;
3496         openowner_slab = kmem_cache_create("nfsd4_openowners",
3497                         sizeof(struct nfs4_openowner), 0, 0, NULL);
3498         if (openowner_slab == NULL)
3499                 goto out_free_client_slab;
3500         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3501                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
3502         if (lockowner_slab == NULL)
3503                 goto out_free_openowner_slab;
3504         file_slab = kmem_cache_create("nfsd4_files",
3505                         sizeof(struct nfs4_file), 0, 0, NULL);
3506         if (file_slab == NULL)
3507                 goto out_free_lockowner_slab;
3508         stateid_slab = kmem_cache_create("nfsd4_stateids",
3509                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3510         if (stateid_slab == NULL)
3511                 goto out_free_file_slab;
3512         deleg_slab = kmem_cache_create("nfsd4_delegations",
3513                         sizeof(struct nfs4_delegation), 0, 0, NULL);
3514         if (deleg_slab == NULL)
3515                 goto out_free_stateid_slab;
3516         odstate_slab = kmem_cache_create("nfsd4_odstate",
3517                         sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3518         if (odstate_slab == NULL)
3519                 goto out_free_deleg_slab;
3520         return 0;
3521 
3522 out_free_deleg_slab:
3523         kmem_cache_destroy(deleg_slab);
3524 out_free_stateid_slab:
3525         kmem_cache_destroy(stateid_slab);
3526 out_free_file_slab:
3527         kmem_cache_destroy(file_slab);
3528 out_free_lockowner_slab:
3529         kmem_cache_destroy(lockowner_slab);
3530 out_free_openowner_slab:
3531         kmem_cache_destroy(openowner_slab);
3532 out_free_client_slab:
3533         kmem_cache_destroy(client_slab);
3534 out:
3535         dprintk("nfsd4: out of memory while initializing nfsv4\n");
3536         return -ENOMEM;
3537 }
3538 
3539 static void init_nfs4_replay(struct nfs4_replay *rp)
3540 {
3541         rp->rp_status = nfserr_serverfault;
3542         rp->rp_buflen = 0;
3543         rp->rp_buf = rp->rp_ibuf;
3544         mutex_init(&rp->rp_mutex);
3545 }
3546 
3547 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3548                 struct nfs4_stateowner *so)
3549 {
3550         if (!nfsd4_has_session(cstate)) {
3551                 mutex_lock(&so->so_replay.rp_mutex);
3552                 cstate->replay_owner = nfs4_get_stateowner(so);
3553         }
3554 }
3555 
3556 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3557 {
3558         struct nfs4_stateowner *so = cstate->replay_owner;
3559 
3560         if (so != NULL) {
3561                 cstate->replay_owner = NULL;
3562                 mutex_unlock(&so->so_replay.rp_mutex);
3563                 nfs4_put_stateowner(so);
3564         }
3565 }
3566 
3567 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3568 {
3569         struct nfs4_stateowner *sop;
3570 
3571         sop = kmem_cache_alloc(slab, GFP_KERNEL);
3572         if (!sop)
3573                 return NULL;
3574 
3575         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3576         if (!sop->so_owner.data) {
3577                 kmem_cache_free(slab, sop);
3578                 return NULL;
3579         }
3580         sop->so_owner.len = owner->len;
3581 
3582         INIT_LIST_HEAD(&sop->so_stateids);
3583         sop->so_client = clp;
3584         init_nfs4_replay(&sop->so_replay);
3585         atomic_set(&sop->so_count, 1);
3586         return sop;
3587 }
3588 
3589 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3590 {
3591         lockdep_assert_held(&clp->cl_lock);
3592 
3593         list_add(&oo->oo_owner.so_strhash,
3594                  &clp->cl_ownerstr_hashtbl[strhashval]);
3595         list_add(&oo->oo_perclient, &clp->cl_openowners);
3596 }
3597 
3598 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3599 {
3600         unhash_openowner_locked(openowner(so));
3601 }
3602 
3603 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3604 {
3605         struct nfs4_openowner *oo = openowner(so);
3606 
3607         kmem_cache_free(openowner_slab, oo);
3608 }
3609 
3610 static const struct nfs4_stateowner_operations openowner_ops = {
3611         .so_unhash =    nfs4_unhash_openowner,
3612         .so_free =      nfs4_free_openowner,
3613 };
3614 
3615 static struct nfs4_ol_stateid *
3616 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3617 {
3618         struct nfs4_ol_stateid *local, *ret = NULL;
3619         struct nfs4_openowner *oo = open->op_openowner;
3620 
3621         lockdep_assert_held(&fp->fi_lock);
3622 
3623         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3624                 /* ignore lock owners */
3625                 if (local->st_stateowner->so_is_open_owner == 0)
3626                         continue;
3627                 if (local->st_stateowner != &oo->oo_owner)
3628                         continue;
3629                 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
3630                         ret = local;
3631                         refcount_inc(&ret->st_stid.sc_count);
3632                         break;
3633                 }
3634         }
3635         return ret;
3636 }
3637 
3638 static __be32
3639 nfsd4_verify_open_stid(struct nfs4_stid *s)
3640 {
3641         __be32 ret = nfs_ok;
3642 
3643         switch (s->sc_type) {
3644         default:
3645                 break;
3646         case 0:
3647         case NFS4_CLOSED_STID:
3648         case NFS4_CLOSED_DELEG_STID:
3649                 ret = nfserr_bad_stateid;
3650                 break;
3651         case NFS4_REVOKED_DELEG_STID:
3652                 ret = nfserr_deleg_revoked;
3653         }
3654         return ret;
3655 }
3656 
3657 /* Lock the stateid st_mutex, and deal with races with CLOSE */
3658 static __be32
3659 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
3660 {
3661         __be32 ret;
3662 
3663         mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
3664         ret = nfsd4_verify_open_stid(&stp->st_stid);
3665         if (ret != nfs_ok)
3666                 mutex_unlock(&stp->st_mutex);
3667         return ret;
3668 }
3669 
3670 static struct nfs4_ol_stateid *
3671 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3672 {
3673         struct nfs4_ol_stateid *stp;
3674         for (;;) {
3675                 spin_lock(&fp->fi_lock);
3676                 stp = nfsd4_find_existing_open(fp, open);
3677                 spin_unlock(&fp->fi_lock);
3678                 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
3679                         break;
3680                 nfs4_put_stid(&stp->st_stid);
3681         }
3682         return stp;
3683 }
3684 
3685 static struct nfs4_openowner *
3686 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3687                            struct nfsd4_compound_state *cstate)
3688 {
3689         struct nfs4_client *clp = cstate->clp;
3690         struct nfs4_openowner *oo, *ret;
3691 
3692         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3693         if (!oo)
3694                 return NULL;
3695         oo->oo_owner.so_ops = &openowner_ops;
3696         oo->oo_owner.so_is_open_owner = 1;
3697         oo->oo_owner.so_seqid = open->op_seqid;
3698         oo->oo_flags = 0;
3699         if (nfsd4_has_session(cstate))
3700                 oo->oo_flags |= NFS4_OO_CONFIRMED;
3701         oo->oo_time = 0;
3702         oo->oo_last_closed_stid = NULL;
3703         INIT_LIST_HEAD(&oo->oo_close_lru);
3704         spin_lock(&clp->cl_lock);
3705         ret = find_openstateowner_str_locked(strhashval, open, clp);
3706         if (ret == NULL) {
3707                 hash_openowner(oo, clp, strhashval);
3708                 ret = oo;
3709         } else
3710                 nfs4_free_stateowner(&oo->oo_owner);
3711 
3712         spin_unlock(&clp->cl_lock);
3713         return ret;
3714 }
3715 
3716 static struct nfs4_ol_stateid *
3717 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
3718 {
3719 
3720         struct nfs4_openowner *oo = open->op_openowner;
3721         struct nfs4_ol_stateid *retstp = NULL;
3722         struct nfs4_ol_stateid *stp;
3723 
3724         stp = open->op_stp;
3725         /* We are moving these outside of the spinlocks to avoid the warnings */
3726         mutex_init(&stp->st_mutex);
3727         mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
3728 
3729 retry:
3730         spin_lock(&oo->oo_owner.so_client->cl_lock);
3731         spin_lock(&fp->fi_lock);
3732 
3733         retstp = nfsd4_find_existing_open(fp, open);
3734         if (retstp)
3735                 goto out_unlock;
3736 
3737         open->op_stp = NULL;
3738         refcount_inc(&stp->st_stid.sc_count);
3739         stp->st_stid.sc_type = NFS4_OPEN_STID;
3740         INIT_LIST_HEAD(&stp->st_locks);
3741         stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
3742         get_nfs4_file(fp);
3743         stp->st_stid.sc_file = fp;
3744         stp->st_access_bmap = 0;
3745         stp->st_deny_bmap = 0;
3746         stp->st_openstp = NULL;
3747         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3748         list_add(&stp->st_perfile, &fp->fi_stateids);
3749 
3750 out_unlock:
3751         spin_unlock(&fp->fi_lock);
3752         spin_unlock(&oo->oo_owner.so_client->cl_lock);
3753         if (retstp) {
3754                 /* Handle races with CLOSE */
3755                 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
3756                         nfs4_put_stid(&retstp->st_stid);
3757                         goto retry;
3758                 }
3759                 /* To keep mutex tracking happy */
3760                 mutex_unlock(&stp->st_mutex);
3761                 stp = retstp;
3762         }
3763         return stp;
3764 }
3765 
3766 /*
3767  * In the 4.0 case we need to keep the owners around a little while to handle
3768  * CLOSE replay. We still do need to release any file access that is held by
3769  * them before returning however.
3770  */
3771 static void
3772 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3773 {
3774         struct nfs4_ol_stateid *last;
3775         struct nfs4_openowner *oo = openowner(s->st_stateowner);
3776         struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3777                                                 nfsd_net_id);
3778 
3779         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3780 
3781         /*
3782          * We know that we hold one reference via nfsd4_close, and another
3783          * "persistent" reference for the client. If the refcount is higher
3784          * than 2, then there are still calls in progress that are using this
3785          * stateid. We can't put the sc_file reference until they are finished.
3786          * Wait for the refcount to drop to 2. Since it has been unhashed,
3787          * there should be no danger of the refcount going back up again at
3788          * this point.
3789          */
3790         wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
3791 
3792         release_all_access(s);
3793         if (s->st_stid.sc_file) {
3794                 put_nfs4_file(s->st_stid.sc_file);
3795                 s->st_stid.sc_file = NULL;
3796         }
3797 
3798         spin_lock(&nn->client_lock);
3799         last = oo->oo_last_closed_stid;
3800         oo->oo_last_closed_stid = s;
3801         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3802         oo->oo_time = get_seconds();
3803         spin_unlock(&nn->client_lock);
3804         if (last)
3805                 nfs4_put_stid(&last->st_stid);
3806 }
3807 
3808 /* search file_hashtbl[] for file */
3809 static struct nfs4_file *
3810 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
3811 {
3812         struct nfs4_file *fp;
3813 
3814         hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
3815                 if (fh_match(&fp->fi_fhandle, fh)) {
3816                         if (refcount_inc_not_zero(&fp->fi_ref))
3817                                 return fp;
3818                 }
3819         }
3820         return NULL;
3821 }
3822 
3823 struct nfs4_file *
3824 find_file(struct knfsd_fh *fh)
3825 {
3826         struct nfs4_file *fp;
3827         unsigned int hashval = file_hashval(fh);
3828 
3829         rcu_read_lock();
3830         fp = find_file_locked(fh, hashval);
3831         rcu_read_unlock();
3832         return fp;
3833 }
3834 
3835 static struct nfs4_file *
3836 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3837 {
3838         struct nfs4_file *fp;
3839         unsigned int hashval = file_hashval(fh);
3840 
3841         rcu_read_lock();
3842         fp = find_file_locked(fh, hashval);
3843         rcu_read_unlock();
3844         if (fp)
3845                 return fp;
3846 
3847         spin_lock(&state_lock);
3848         fp = find_file_locked(fh, hashval);
3849         if (likely(fp == NULL)) {
3850                 nfsd4_init_file(fh, hashval, new);
3851                 fp = new;
3852         }
3853         spin_unlock(&state_lock);
3854 
3855         return fp;
3856 }
3857 
3858 /*
3859  * Called to check deny when READ with all zero stateid or
3860  * WRITE with all zero or all one stateid
3861  */
3862 static __be32
3863 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3864 {
3865         struct nfs4_file *fp;
3866         __be32 ret = nfs_ok;
3867 
3868         fp = find_file(&current_fh->fh_handle);
3869         if (!fp)
3870                 return ret;
3871         /* Check for conflicting share reservations */
3872         spin_lock(&fp->fi_lock);
3873         if (fp->fi_share_deny & deny_type)
3874                 ret = nfserr_locked;
3875         spin_unlock(&fp->fi_lock);
3876         put_nfs4_file(fp);
3877         return ret;
3878 }
3879 
3880 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
3881 {
3882         struct nfs4_delegation *dp = cb_to_delegation(cb);
3883         struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3884                                           nfsd_net_id);
3885 
3886         block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3887 
3888         /*
3889          * We can't do this in nfsd_break_deleg_cb because it is
3890          * already holding inode->i_lock.
3891          *
3892          * If the dl_time != 0, then we know that it has already been
3893          * queued for a lease break. Don't queue it again.
3894          */
3895         spin_lock(&state_lock);
3896         if (dp->dl_time == 0) {
3897                 dp->dl_time = get_seconds();
3898                 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3899         }
3900         spin_unlock(&state_lock);
3901 }
3902 
3903 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
3904                 struct rpc_task *task)
3905 {
3906         struct nfs4_delegation *dp = cb_to_delegation(cb);
3907 
3908         if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
3909                 return 1;
3910 
3911         switch (task->tk_status) {
3912         case 0:
3913                 return 1;
3914         case -EBADHANDLE:
3915         case -NFS4ERR_BAD_STATEID:
3916                 /*
3917                  * Race: client probably got cb_recall before open reply
3918                  * granting delegation.
3919                  */
3920                 if (dp->dl_retries--) {
3921                         rpc_delay(task, 2 * HZ);
3922                         return 0;
3923                 }
3924                 /*FALLTHRU*/
3925         default:
3926                 return -1;
3927         }
3928 }
3929 
3930 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
3931 {
3932         struct nfs4_delegation *dp = cb_to_delegation(cb);
3933 
3934         nfs4_put_stid(&dp->dl_stid);
3935 }
3936 
3937 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
3938         .prepare        = nfsd4_cb_recall_prepare,
3939         .done           = nfsd4_cb_recall_done,
3940         .release        = nfsd4_cb_recall_release,
3941 };
3942 
3943 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3944 {
3945         /*
3946          * We're assuming the state code never drops its reference
3947          * without first removing the lease.  Since we're in this lease
3948          * callback (and since the lease code is serialized by the kernel
3949          * lock) we know the server hasn't removed the lease yet, we know
3950          * it's safe to take a reference.
3951          */
3952         refcount_inc(&dp->dl_stid.sc_count);
3953         nfsd4_run_cb(&dp->dl_recall);
3954 }
3955 
3956 /* Called from break_lease() with i_lock held. */
3957 static bool
3958 nfsd_break_deleg_cb(struct file_lock *fl)
3959 {
3960         bool ret = false;
3961         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
3962         struct nfs4_file *fp = dp->dl_stid.sc_file;
3963 
3964         /*
3965          * We don't want the locks code to timeout the lease for us;
3966          * we'll remove it ourself if a delegation isn't returned
3967          * in time:
3968          */
3969         fl->fl_break_time = 0;
3970 
3971         spin_lock(&fp->fi_lock);
3972         fp->fi_had_conflict = true;
3973         nfsd_break_one_deleg(dp);
3974         spin_unlock(&fp->fi_lock);
3975         return ret;
3976 }
3977 
3978 static int
3979 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
3980                      struct list_head *dispose)
3981 {
3982         if (arg & F_UNLCK)
3983                 return lease_modify(onlist, arg, dispose);
3984         else
3985                 return -EAGAIN;
3986 }
3987 
3988 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3989         .lm_break = nfsd_break_deleg_cb,
3990         .lm_change = nfsd_change_deleg_cb,
3991 };
3992 
3993 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3994 {
3995         if (nfsd4_has_session(cstate))
3996                 return nfs_ok;
3997         if (seqid == so->so_seqid - 1)
3998                 return nfserr_replay_me;
3999         if (seqid == so->so_seqid)
4000                 return nfs_ok;
4001         return nfserr_bad_seqid;
4002 }
4003 
4004 static __be32 lookup_clientid(clientid_t *clid,
4005                 struct nfsd4_compound_state *cstate,
4006                 struct nfsd_net *nn)
4007 {
4008         struct nfs4_client *found;
4009 
4010         if (cstate->clp) {
4011                 found = cstate->clp;
4012                 if (!same_clid(&found->cl_clientid, clid))
4013                         return nfserr_stale_clientid;
4014                 return nfs_ok;
4015         }
4016 
4017         if (STALE_CLIENTID(clid, nn))
4018                 return nfserr_stale_clientid;
4019 
4020         /*
4021          * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4022          * cached already then we know this is for is for v4.0 and "sessions"
4023          * will be false.
4024          */
4025         WARN_ON_ONCE(cstate->session);
4026         spin_lock(&nn->client_lock);
4027         found = find_confirmed_client(clid, false, nn);
4028         if (!found) {
4029                 spin_unlock(&nn->client_lock);
4030                 return nfserr_expired;
4031         }
4032         atomic_inc(&found->cl_refcount);
4033         spin_unlock(&nn->client_lock);
4034 
4035         /* Cache the nfs4_client in cstate! */
4036         cstate->clp = found;
4037         return nfs_ok;
4038 }
4039 
4040 __be32
4041 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4042                     struct nfsd4_open *open, struct nfsd_net *nn)
4043 {
4044         clientid_t *clientid = &open->op_clientid;
4045         struct nfs4_client *clp = NULL;
4046         unsigned int strhashval;
4047         struct nfs4_openowner *oo = NULL;
4048         __be32 status;
4049 
4050         if (STALE_CLIENTID(&open->op_clientid, nn))
4051                 return nfserr_stale_clientid;
4052         /*
4053          * In case we need it later, after we've already created the
4054          * file and don't want to risk a further failure:
4055          */
4056         open->op_file = nfsd4_alloc_file();
4057         if (open->op_file == NULL)
4058                 return nfserr_jukebox;
4059 
4060         status = lookup_clientid(clientid, cstate, nn);
4061         if (status)
4062                 return status;
4063         clp = cstate->clp;
4064 
4065         strhashval = ownerstr_hashval(&open->op_owner);
4066         oo = find_openstateowner_str(strhashval, open, clp);
4067         open->op_openowner = oo;
4068         if (!oo) {
4069                 goto new_owner;
4070         }
4071         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4072                 /* Replace unconfirmed owners without checking for replay. */
4073                 release_openowner(oo);
4074                 open->op_openowner = NULL;
4075                 goto new_owner;
4076         }
4077         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4078         if (status)
4079                 return status;
4080         goto alloc_stateid;
4081 new_owner:
4082         oo = alloc_init_open_stateowner(strhashval, open, cstate);
4083         if (oo == NULL)
4084                 return nfserr_jukebox;
4085         open->op_openowner = oo;
4086 alloc_stateid:
4087         open->op_stp = nfs4_alloc_open_stateid(clp);
4088         if (!open->op_stp)
4089                 return nfserr_jukebox;
4090 
4091         if (nfsd4_has_session(cstate) &&
4092             (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4093                 open->op_odstate = alloc_clnt_odstate(clp);
4094                 if (!open->op_odstate)
4095                         return nfserr_jukebox;
4096         }
4097 
4098         return nfs_ok;
4099 }
4100 
4101 static inline __be32
4102 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4103 {
4104         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4105                 return nfserr_openmode;
4106         else
4107                 return nfs_ok;
4108 }
4109 
4110 static int share_access_to_flags(u32 share_access)
4111 {
4112         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4113 }
4114 
4115 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4116 {
4117         struct nfs4_stid *ret;
4118 
4119         ret = find_stateid_by_type(cl, s,
4120                                 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4121         if (!ret)
4122                 return NULL;
4123         return delegstateid(ret);
4124 }
4125 
4126 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4127 {
4128         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4129                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4130 }
4131 
4132 static __be32
4133 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4134                 struct nfs4_delegation **dp)
4135 {
4136         int flags;
4137         __be32 status = nfserr_bad_stateid;
4138         struct nfs4_delegation *deleg;
4139 
4140         deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4141         if (deleg == NULL)
4142                 goto out;
4143         if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4144                 nfs4_put_stid(&deleg->dl_stid);
4145                 if (cl->cl_minorversion)
4146                         status = nfserr_deleg_revoked;
4147                 goto out;
4148         }
4149         flags = share_access_to_flags(open->op_share_access);
4150         status = nfs4_check_delegmode(deleg, flags);
4151         if (status) {
4152                 nfs4_put_stid(&deleg->dl_stid);
4153                 goto out;
4154         }
4155         *dp = deleg;
4156 out:
4157         if (!nfsd4_is_deleg_cur(open))
4158                 return nfs_ok;
4159         if (status)
4160                 return status;
4161         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4162         return nfs_ok;
4163 }
4164 
4165 static inline int nfs4_access_to_access(u32 nfs4_access)
4166 {
4167         int flags = 0;
4168 
4169         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4170                 flags |= NFSD_MAY_READ;
4171         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4172                 flags |= NFSD_MAY_WRITE;
4173         return flags;
4174 }
4175 
4176 static inline __be32
4177 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4178                 struct nfsd4_open *open)
4179 {
4180         struct iattr iattr = {
4181                 .ia_valid = ATTR_SIZE,
4182                 .ia_size = 0,
4183         };
4184         if (!open->op_truncate)
4185                 return 0;
4186         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4187                 return nfserr_inval;
4188         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
4189 }
4190 
4191 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4192                 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4193                 struct nfsd4_open *open)
4194 {
4195         struct file *filp = NULL;
4196         __be32 status;
4197         int oflag = nfs4_access_to_omode(open->op_share_access);
4198         int access = nfs4_access_to_access(open->op_share_access);
4199         unsigned char old_access_bmap, old_deny_bmap;
4200 
4201         spin_lock(&fp->fi_lock);
4202 
4203         /*
4204          * Are we trying to set a deny mode that would conflict with
4205          * current access?
4206          */
4207         status = nfs4_file_check_deny(fp, open->op_share_deny);
4208         if (status != nfs_ok) {
4209                 spin_unlock(&fp->fi_lock);
4210                 goto out;
4211         }
4212 
4213         /* set access to the file */
4214         status = nfs4_file_get_access(fp, open->op_share_access);
4215         if (status != nfs_ok) {
4216                 spin_unlock(&fp->fi_lock);
4217                 goto out;
4218         }
4219 
4220         /* Set access bits in stateid */
4221         old_access_bmap = stp->st_access_bmap;
4222         set_access(open->op_share_access, stp);
4223 
4224         /* Set new deny mask */
4225         old_deny_bmap = stp->st_deny_bmap;
4226         set_deny(open->op_share_deny, stp);
4227         fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4228 
4229         if (!fp->fi_fds[oflag]) {
4230                 spin_unlock(&fp->fi_lock);
4231                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
4232                 if (status)
4233                         goto out_put_access;
4234                 spin_lock(&fp->fi_lock);
4235                 if (!fp->fi_fds[oflag]) {
4236                         fp->fi_fds[oflag] = filp;
4237                         filp = NULL;
4238                 }
4239         }
4240         spin_unlock(&fp->fi_lock);
4241         if (filp)
4242                 fput(filp);
4243 
4244         status = nfsd4_truncate(rqstp, cur_fh, open);
4245         if (status)
4246                 goto out_put_access;
4247 out:
4248         return status;
4249 out_put_access:
4250         stp->st_access_bmap = old_access_bmap;
4251         nfs4_file_put_access(fp, open->op_share_access);
4252         reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4253         goto out;
4254 }
4255 
4256 static __be32
4257 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)
4258 {
4259         __be32 status;
4260         unsigned char old_deny_bmap = stp->st_deny_bmap;
4261 
4262         if (!test_access(open->op_share_access, stp))
4263                 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4264 
4265         /* test and set deny mode */
4266         spin_lock(&fp->fi_lock);
4267         status = nfs4_file_check_deny(fp, open->op_share_deny);
4268         if (status == nfs_ok) {
4269                 set_deny(open->op_share_deny, stp);
4270                 fp->fi_share_deny |=
4271                                 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4272         }
4273         spin_unlock(&fp->fi_lock);
4274 
4275         if (status != nfs_ok)
4276                 return status;
4277 
4278         status = nfsd4_truncate(rqstp, cur_fh, open);
4279         if (status != nfs_ok)
4280                 reset_union_bmap_deny(old_deny_bmap, stp);
4281         return status;
4282 }
4283 
4284 /* Should we give out recallable state?: */
4285 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4286 {
4287         if (clp->cl_cb_state == NFSD4_CB_UP)
4288                 return true;
4289         /*
4290          * In the sessions case, since we don't have to establish a
4291          * separate connection for callbacks, we assume it's OK
4292          * until we hear otherwise:
4293          */
4294         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4295 }
4296 
4297 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
4298                                                 int flag)
4299 {
4300         struct file_lock *fl;
4301 
4302         fl = locks_alloc_lock();
4303         if (!fl)
4304                 return NULL;
4305         fl->fl_lmops = &nfsd_lease_mng_ops;
4306         fl->fl_flags = FL_DELEG;
4307         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4308         fl->fl_end = OFFSET_MAX;
4309         fl->fl_owner = (fl_owner_t)dp;
4310         fl->fl_pid = current->tgid;
4311         fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file;
4312         return fl;
4313 }
4314 
4315 static struct nfs4_delegation *
4316 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4317                     struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4318 {
4319         int status = 0;
4320         struct nfs4_delegation *dp;
4321         struct file *filp;
4322         struct file_lock *fl;
4323 
4324         /*
4325          * The fi_had_conflict and nfs_get_existing_delegation checks
4326          * here are just optimizations; we'll need to recheck them at
4327          * the end:
4328          */
4329         if (fp->fi_had_conflict)
4330                 return ERR_PTR(-EAGAIN);
4331 
4332         filp = find_readable_file(fp);
4333         if (!filp) {
4334                 /* We should always have a readable file here */
4335                 WARN_ON_ONCE(1);
4336                 return ERR_PTR(-EBADF);
4337         }
4338         spin_lock(&state_lock);
4339         spin_lock(&fp->fi_lock);
4340         if (nfs4_delegation_exists(clp, fp))
4341                 status = -EAGAIN;
4342         else if (!fp->fi_deleg_file) {
4343                 fp->fi_deleg_file = filp;
4344                 /* increment early to prevent fi_deleg_file from being
4345                  * cleared */
4346                 fp->fi_delegees = 1;
4347                 filp = NULL;
4348         } else
4349                 fp->fi_delegees++;
4350         spin_unlock(&fp->fi_lock);
4351         spin_unlock(&state_lock);
4352         if (filp)
4353                 fput(filp);
4354         if (status)
4355                 return ERR_PTR(status);
4356 
4357         status = -ENOMEM;
4358         dp = alloc_init_deleg(clp, fp, fh, odstate);
4359         if (!dp)
4360                 goto out_delegees;
4361 
4362         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
4363         if (!fl)
4364                 goto out_clnt_odstate;
4365 
4366         status = vfs_setlease(fp->fi_deleg_file, fl->fl_type, &fl, NULL);
4367         if (fl)
4368                 locks_free_lock(fl);
4369         if (status)
4370                 goto out_clnt_odstate;
4371 
4372         spin_lock(&state_lock);
4373         spin_lock(&fp->fi_lock);
4374         if (fp->fi_had_conflict)
4375                 status = -EAGAIN;
4376         else
4377                 status = hash_delegation_locked(dp, fp);
4378         spin_unlock(&fp->fi_lock);
4379         spin_unlock(&state_lock);
4380 
4381         if (status)
4382                 goto out_unlock;
4383 
4384         return dp;
4385 out_unlock:
4386         vfs_setlease(fp->fi_deleg_file, F_UNLCK, NULL, (void **)&dp);
4387 out_clnt_odstate:
4388         put_clnt_odstate(dp->dl_clnt_odstate);
4389         nfs4_put_stid(&dp->dl_stid);
4390 out_delegees:
4391         put_deleg_file(fp);
4392         return ERR_PTR(status);
4393 }
4394 
4395 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4396 {
4397         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4398         if (status == -EAGAIN)
4399                 open->op_why_no_deleg = WND4_CONTENTION;
4400         else {
4401                 open->op_why_no_deleg = WND4_RESOURCE;
4402                 switch (open->op_deleg_want) {
4403                 case NFS4_SHARE_WANT_READ_DELEG:
4404                 case NFS4_SHARE_WANT_WRITE_DELEG:
4405                 case NFS4_SHARE_WANT_ANY_DELEG:
4406                         break;
4407                 case NFS4_SHARE_WANT_CANCEL:
4408                         open->op_why_no_deleg = WND4_CANCELLED;
4409                         break;
4410                 case NFS4_SHARE_WANT_NO_DELEG:
4411                         WARN_ON_ONCE(1);
4412                 }
4413         }
4414 }
4415 
4416 /*
4417  * Attempt to hand out a delegation.
4418  *
4419  * Note we don't support write delegations, and won't until the vfs has
4420  * proper support for them.
4421  */
4422 static void
4423 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4424                         struct nfs4_ol_stateid *stp)
4425 {
4426         struct nfs4_delegation *dp;
4427         struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4428         struct nfs4_client *clp = stp->st_stid.sc_client;
4429         int cb_up;
4430         int status = 0;
4431 
4432         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4433         open->op_recall = 0;
4434         switch (open->op_claim_type) {
4435                 case NFS4_OPEN_CLAIM_PREVIOUS:
4436                         if (!cb_up)
4437                                 open->op_recall = 1;
4438                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4439                                 goto out_no_deleg;
4440                         break;
4441                 case NFS4_OPEN_CLAIM_NULL:
4442                 case NFS4_OPEN_CLAIM_FH:
4443                         /*
4444                          * Let's not give out any delegations till everyone's
4445                          * had the chance to reclaim theirs, *and* until
4446                          * NLM locks have all been reclaimed:
4447                          */
4448                         if (locks_in_grace(clp->net))
4449                                 goto out_no_deleg;
4450                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4451                                 goto out_no_deleg;
4452                         /*
4453                          * Also, if the file was opened for write or
4454                          * create, there's a good chance the client's
4455                          * about to write to it, resulting in an
4456                          * immediate recall (since we don't support
4457                          * write delegations):
4458                          */
4459                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4460                                 goto out_no_deleg;
4461                         if (open->op_create == NFS4_OPEN_CREATE)
4462                                 goto out_no_deleg;
4463                         break;
4464                 default:
4465                         goto out_no_deleg;
4466         }
4467         dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4468         if (IS_ERR(dp))
4469                 goto out_no_deleg;
4470 
4471         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4472 
4473         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4474                 STATEID_VAL(&dp->dl_stid.sc_stateid));
4475         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4476         nfs4_put_stid(&dp->dl_stid);
4477         return;
4478 out_no_deleg:
4479         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4480         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4481             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4482                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4483                 open->op_recall = 1;
4484         }
4485 
4486         /* 4.1 client asking for a delegation? */
4487         if (open->op_deleg_want)
4488                 nfsd4_open_deleg_none_ext(open, status);
4489         return;
4490 }
4491 
4492 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4493                                         struct nfs4_delegation *dp)
4494 {
4495         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4496             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4497                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4498                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4499         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4500                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4501                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4502                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4503         }
4504         /* Otherwise the client must be confused wanting a delegation
4505          * it already has, therefore we don't return
4506          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4507          */
4508 }
4509 
4510 __be32
4511 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4512 {
4513         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4514         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4515         struct nfs4_file *fp = NULL;
4516         struct nfs4_ol_stateid *stp = NULL;
4517         struct nfs4_delegation *dp = NULL;
4518         __be32 status;
4519         bool new_stp = false;
4520 
4521         /*
4522          * Lookup file; if found, lookup stateid and check open request,
4523          * and check for delegations in the process of being recalled.
4524          * If not found, create the nfs4_file struct
4525          */
4526         fp = find_or_add_file(open->op_file, &current_fh->fh_handle);
4527         if (fp != open->op_file) {
4528                 status = nfs4_check_deleg(cl, open, &dp);
4529                 if (status)
4530                         goto out;
4531                 stp = nfsd4_find_and_lock_existing_open(fp, open);
4532         } else {
4533                 open->op_file = NULL;
4534                 status = nfserr_bad_stateid;
4535                 if (nfsd4_is_deleg_cur(open))
4536                         goto out;
4537         }
4538 
4539         if (!stp) {
4540                 stp = init_open_stateid(fp, open);
4541                 if (!open->op_stp)
4542                         new_stp = true;
4543         }
4544 
4545         /*
4546          * OPEN the file, or upgrade an existing OPEN.
4547          * If truncate fails, the OPEN fails.
4548          *
4549          * stp is already locked.
4550          */
4551         if (!new_stp) {
4552                 /* Stateid was found, this is an OPEN upgrade */
4553                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4554                 if (status) {
4555                         mutex_unlock(&stp->st_mutex);
4556                         goto out;
4557                 }
4558         } else {
4559                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4560                 if (status) {
4561                         stp->st_stid.sc_type = NFS4_CLOSED_STID;
4562                         release_open_stateid(stp);
4563                         mutex_unlock(&stp->st_mutex);
4564                         goto out;
4565                 }
4566 
4567                 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
4568                                                         open->op_odstate);
4569                 if (stp->st_clnt_odstate == open->op_odstate)
4570                         open->op_odstate = NULL;
4571         }
4572 
4573         nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
4574         mutex_unlock(&stp->st_mutex);
4575 
4576         if (nfsd4_has_session(&resp->cstate)) {
4577                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4578                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4579                         open->op_why_no_deleg = WND4_NOT_WANTED;
4580                         goto nodeleg;
4581                 }
4582         }
4583 
4584         /*
4585         * Attempt to hand out a delegation. No error return, because the
4586         * OPEN succeeds even if we fail.
4587         */
4588         nfs4_open_delegation(current_fh, open, stp);
4589 nodeleg:
4590         status = nfs_ok;
4591 
4592         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4593                 STATEID_VAL(&stp->st_stid.sc_stateid));
4594 out:
4595         /* 4.1 client trying to upgrade/downgrade delegation? */
4596         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4597             open->op_deleg_want)
4598                 nfsd4_deleg_xgrade_none_ext(open, dp);
4599 
4600         if (fp)
4601                 put_nfs4_file(fp);
4602         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4603                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4604         /*
4605         * To finish the open response, we just need to set the rflags.
4606         */
4607         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4608         if (nfsd4_has_session(&resp->cstate))
4609                 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
4610         else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
4611                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4612 
4613         if (dp)
4614                 nfs4_put_stid(&dp->dl_stid);
4615         if (stp)
4616                 nfs4_put_stid(&stp->st_stid);
4617 
4618         return status;
4619 }
4620 
4621 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4622                               struct nfsd4_open *open)
4623 {
4624         if (open->op_openowner) {
4625                 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4626 
4627                 nfsd4_cstate_assign_replay(cstate, so);
4628                 nfs4_put_stateowner(so);
4629         }
4630         if (open->op_file)
4631                 kmem_cache_free(file_slab, open->op_file);
4632         if (open->op_stp)
4633                 nfs4_put_stid(&open->op_stp->st_stid);
4634         if (open->op_odstate)
4635                 kmem_cache_free(odstate_slab, open->op_odstate);
4636 }
4637 
4638 __be32
4639 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4640             union nfsd4_op_u *u)
4641 {
4642         clientid_t *clid = &u->renew;
4643         struct nfs4_client *clp;
4644         __be32 status;
4645         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4646 
4647         dprintk("process_renew(%08x/%08x): starting\n", 
4648                         clid->cl_boot, clid->cl_id);
4649         status = lookup_clientid(clid, cstate, nn);
4650         if (status)
4651                 goto out;
4652         clp = cstate->clp;
4653         status = nfserr_cb_path_down;
4654         if (!list_empty(&clp->cl_delegations)
4655                         && clp->cl_cb_state != NFSD4_CB_UP)
4656                 goto out;
4657         status = nfs_ok;
4658 out:
4659         return status;
4660 }
4661 
4662 void
4663 nfsd4_end_grace(struct nfsd_net *nn)
4664 {
4665         /* do nothing if grace period already ended */
4666         if (nn->grace_ended)
4667                 return;
4668 
4669         dprintk("NFSD: end of grace period\n");
4670         nn->grace_ended = true;
4671         /*
4672          * If the server goes down again right now, an NFSv4
4673          * client will still be allowed to reclaim after it comes back up,
4674          * even if it hasn't yet had a chance to reclaim state this time.
4675          *
4676          */
4677         nfsd4_record_grace_done(nn);
4678         /*
4679          * At this point, NFSv4 clients can still reclaim.  But if the
4680          * server crashes, any that have not yet reclaimed will be out
4681          * of luck on the next boot.
4682          *
4683          * (NFSv4.1+ clients are considered to have reclaimed once they
4684          * call RECLAIM_COMPLETE.  NFSv4.0 clients are considered to
4685          * have reclaimed after their first OPEN.)
4686          */
4687         locks_end_grace(&nn->nfsd4_manager);
4688         /*
4689          * At this point, and once lockd and/or any other containers
4690          * exit their grace period, further reclaims will fail and
4691          * regular locking can resume.
4692          */
4693 }
4694 
4695 static time_t
4696 nfs4_laundromat(struct nfsd_net *nn)
4697 {
4698         struct nfs4_client *clp;
4699         struct nfs4_openowner *oo;
4700         struct nfs4_delegation *dp;
4701         struct nfs4_ol_stateid *stp;
4702         struct nfsd4_blocked_lock *nbl;
4703         struct list_head *pos, *next, reaplist;
4704         time_t cutoff = get_seconds() - nn->nfsd4_lease;
4705         time_t t, new_timeo = nn->nfsd4_lease;
4706 
4707         dprintk("NFSD: laundromat service - starting\n");
4708         nfsd4_end_grace(nn);
4709         INIT_LIST_HEAD(&reaplist);
4710         spin_lock(&nn->client_lock);
4711         list_for_each_safe(pos, next, &nn->client_lru) {
4712                 clp = list_entry(pos, struct nfs4_client, cl_lru);
4713                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4714                         t = clp->cl_time - cutoff;
4715                         new_timeo = min(new_timeo, t);
4716                         break;
4717                 }
4718                 if (mark_client_expired_locked(clp)) {
4719                         dprintk("NFSD: client in use (clientid %08x)\n",
4720                                 clp->cl_clientid.cl_id);
4721                         continue;
4722                 }
4723                 list_add(&clp->cl_lru, &reaplist);
4724         }
4725         spin_unlock(&nn->client_lock);
4726         list_for_each_safe(pos, next, &reaplist) {
4727                 clp = list_entry(pos, struct nfs4_client, cl_lru);
4728                 dprintk("NFSD: purging unused client (clientid %08x)\n",
4729                         clp->cl_clientid.cl_id);
4730                 list_del_init(&clp->cl_lru);
4731                 expire_client(clp);
4732         }
4733         spin_lock(&state_lock);
4734         list_for_each_safe(pos, next, &nn->del_recall_lru) {
4735                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4736                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4737                         t = dp->dl_time - cutoff;
4738                         new_timeo = min(new_timeo, t);
4739                         break;
4740                 }
4741                 WARN_ON(!unhash_delegation_locked(dp));
4742                 list_add(&dp->dl_recall_lru, &reaplist);
4743         }
4744         spin_unlock(&state_lock);
4745         while (!list_empty(&reaplist)) {
4746                 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4747                                         dl_recall_lru);
4748                 list_del_init(&dp->dl_recall_lru);
4749                 revoke_delegation(dp);
4750         }
4751 
4752         spin_lock(&nn->client_lock);
4753         while (!list_empty(&nn->close_lru)) {
4754                 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4755                                         oo_close_lru);
4756                 if (time_after((unsigned long)oo->oo_time,
4757                                (unsigned long)cutoff)) {
4758                         t = oo->oo_time - cutoff;
4759                         new_timeo = min(new_timeo, t);
4760                         break;
4761                 }
4762                 list_del_init(&oo->oo_close_lru);
4763                 stp = oo->oo_last_closed_stid;
4764                 oo->oo_last_closed_stid = NULL;
4765                 spin_unlock(&nn->client_lock);
4766                 nfs4_put_stid(&stp->st_stid);
4767                 spin_lock(&nn->client_lock);
4768         }
4769         spin_unlock(&nn->client_lock);
4770 
4771         /*
4772          * It's possible for a client to try and acquire an already held lock
4773          * that is being held for a long time, and then lose interest in it.
4774          * So, we clean out any un-revisited request after a lease period
4775          * under the assumption that the client is no longer interested.
4776          *
4777          * RFC5661, sec. 9.6 states that the client must not rely on getting
4778          * notifications and must continue to poll for locks, even when the
4779          * server supports them. Thus this shouldn't lead to clients blocking
4780          * indefinitely once the lock does become free.
4781          */
4782         BUG_ON(!list_empty(&reaplist));
4783         spin_lock(&nn->blocked_locks_lock);
4784         while (!list_empty(&nn->blocked_locks_lru)) {
4785                 nbl = list_first_entry(&nn->blocked_locks_lru,
4786                                         struct nfsd4_blocked_lock, nbl_lru);
4787                 if (time_after((unsigned long)nbl->nbl_time,
4788                                (unsigned long)cutoff)) {
4789                         t = nbl->nbl_time - cutoff;
4790                         new_timeo = min(new_timeo, t);
4791                         break;
4792                 }
4793                 list_move(&nbl->nbl_lru, &reaplist);
4794                 list_del_init(&nbl->nbl_list);
4795         }
4796         spin_unlock(&nn->blocked_locks_lock);
4797 
4798         while (!list_empty(&reaplist)) {
4799                 nbl = list_first_entry(&reaplist,
4800                                         struct nfsd4_blocked_lock, nbl_lru);
4801                 list_del_init(&nbl->nbl_lru);
4802                 posix_unblock_lock(&nbl->nbl_lock);
4803                 free_blocked_lock(nbl);
4804         }
4805 
4806         new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4807         return new_timeo;
4808 }
4809 
4810 static struct workqueue_struct *laundry_wq;
4811 static void laundromat_main(struct work_struct *);
4812 
4813 static void
4814 laundromat_main(struct work_struct *laundry)
4815 {
4816         time_t t;
4817         struct delayed_work *dwork = to_delayed_work(laundry);
4818         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4819                                            laundromat_work);
4820 
4821         t = nfs4_laundromat(nn);
4822         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4823         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4824 }
4825 
4826 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
4827 {
4828         if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
4829                 return nfserr_bad_stateid;
4830         return nfs_ok;
4831 }
4832 
4833 static inline int
4834 access_permit_read(struct nfs4_ol_stateid *stp)
4835 {
4836         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4837                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4838                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4839 }
4840 
4841 static inline int
4842 access_permit_write(struct nfs4_ol_stateid *stp)
4843 {
4844         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4845                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4846 }
4847 
4848 static
4849 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4850 {
4851         __be32 status = nfserr_openmode;
4852 
4853         /* For lock stateid's, we test the parent open, not the lock: */
4854         if (stp->st_openstp)
4855                 stp = stp->st_openstp;
4856         if ((flags & WR_STATE) && !access_permit_write(stp))
4857                 goto out;
4858         if ((flags & RD_STATE) && !access_permit_read(stp))
4859                 goto out;
4860         status = nfs_ok;
4861 out:
4862         return status;
4863 }
4864 
4865 static inline __be32
4866 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4867 {
4868         if (ONE_STATEID(stateid) && (flags & RD_STATE))
4869                 return nfs_ok;
4870         else if (opens_in_grace(net)) {
4871                 /* Answer in remaining cases depends on existence of
4872                  * conflicting state; so we must wait out the grace period. */
4873                 return nfserr_grace;
4874         } else if (flags & WR_STATE)
4875                 return nfs4_share_conflict(current_fh,
4876                                 NFS4_SHARE_DENY_WRITE);
4877         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4878                 return nfs4_share_conflict(current_fh,
4879                                 NFS4_SHARE_DENY_READ);
4880 }
4881 
4882 /*
4883  * Allow READ/WRITE during grace period on recovered state only for files
4884  * that are not able to provide mandatory locking.
4885  */
4886 static inline int
4887 grace_disallows_io(struct net *net, struct inode *inode)
4888 {
4889         return opens_in_grace(net) && mandatory_lock(inode);
4890 }
4891 
4892 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4893 {
4894         /*
4895          * When sessions are used the stateid generation number is ignored
4896          * when it is zero.
4897          */
4898         if (has_session && in->si_generation == 0)
4899                 return nfs_ok;
4900 
4901         if (in->si_generation == ref->si_generation)
4902                 return nfs_ok;
4903 
4904         /* If the client sends us a stateid from the future, it's buggy: */
4905         if (nfsd4_stateid_generation_after(in, ref))
4906                 return nfserr_bad_stateid;
4907         /*
4908          * However, we could see a stateid from the past, even from a
4909          * non-buggy client.  For example, if the client sends a lock
4910          * while some IO is outstanding, the lock may bump si_generation
4911          * while the IO is still in flight.  The client could avoid that
4912          * situation by waiting for responses on all the IO requests,
4913          * but better performance may result in retrying IO that
4914          * receives an old_stateid error if requests are rarely
4915          * reordered in flight:
4916          */
4917         return nfserr_old_stateid;
4918 }
4919 
4920 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
4921 {
4922         __be32 ret;
4923 
4924         spin_lock(&s->sc_lock);
4925         ret = nfsd4_verify_open_stid(s);
4926         if (ret == nfs_ok)
4927                 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
4928         spin_unlock(&s->sc_lock);
4929         return ret;
4930 }
4931 
4932 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
4933 {
4934         if (ols->st_stateowner->so_is_open_owner &&
4935             !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4936                 return nfserr_bad_stateid;
4937         return nfs_ok;
4938 }
4939 
4940 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4941 {
4942         struct nfs4_stid *s;
4943         __be32 status = nfserr_bad_stateid;
4944 
4945         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
4946                 CLOSE_STATEID(stateid))
4947                 return status;
4948         /* Client debugging aid. */
4949         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4950                 char addr_str[INET6_ADDRSTRLEN];
4951                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4952                                  sizeof(addr_str));
4953                 pr_warn_ratelimited("NFSD: client %s testing state ID "
4954                                         "with incorrect client ID\n", addr_str);
4955                 return status;
4956         }
4957         spin_lock(&cl->cl_lock);
4958         s = find_stateid_locked(cl, stateid);
4959         if (!s)
4960                 goto out_unlock;
4961         status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
4962         if (status)
4963                 goto out_unlock;
4964         switch (s->sc_type) {
4965         case NFS4_DELEG_STID:
4966                 status = nfs_ok;
4967                 break;
4968         case NFS4_REVOKED_DELEG_STID:
4969                 status = nfserr_deleg_revoked;
4970                 break;
4971         case NFS4_OPEN_STID:
4972         case NFS4_LOCK_STID:
4973                 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
4974                 break;
4975         default:
4976                 printk("unknown stateid type %x\n", s->sc_type);
4977                 /* Fallthrough */
4978         case NFS4_CLOSED_STID:
4979         case NFS4_CLOSED_DELEG_STID:
4980                 status = nfserr_bad_stateid;
4981         }
4982 out_unlock:
4983         spin_unlock(&cl->cl_lock);
4984         return status;
4985 }
4986 
4987 __be32
4988 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
4989                      stateid_t *stateid, unsigned char typemask,
4990                      struct nfs4_stid **s, struct nfsd_net *nn)
4991 {
4992         __be32 status;
4993         bool return_revoked = false;
4994 
4995         /*
4996          *  only return revoked delegations if explicitly asked.
4997          *  otherwise we report revoked or bad_stateid status.
4998          */
4999         if (typemask & NFS4_REVOKED_DELEG_STID)
5000                 return_revoked = true;
5001         else if (typemask & NFS4_DELEG_STID)
5002                 typemask |= NFS4_REVOKED_DELEG_STID;
5003 
5004         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5005                 CLOSE_STATEID(stateid))
5006                 return nfserr_bad_stateid;
5007         status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
5008         if (status == nfserr_stale_clientid) {
5009                 if (cstate->session)
5010                         return nfserr_bad_stateid;
5011                 return nfserr_stale_stateid;
5012         }
5013         if (status)
5014                 return status;
5015         *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5016         if (!*s)
5017                 return nfserr_bad_stateid;
5018         if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5019                 nfs4_put_stid(*s);
5020                 if (cstate->minorversion)
5021                         return nfserr_deleg_revoked;
5022                 return nfserr_bad_stateid;
5023         }
5024         return nfs_ok;
5025 }
5026 
5027 static struct file *
5028 nfs4_find_file(struct nfs4_stid *s, int flags)
5029 {
5030         if (!s)
5031                 return NULL;
5032 
5033         switch (s->sc_type) {
5034         case NFS4_DELEG_STID:
5035                 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5036                         return NULL;
5037                 return get_file(s->sc_file->fi_deleg_file);
5038         case NFS4_OPEN_STID:
5039         case NFS4_LOCK_STID:
5040                 if (flags & RD_STATE)
5041                         return find_readable_file(s->sc_file);
5042                 else
5043                         return find_writeable_file(s->sc_file);
5044                 break;
5045         }
5046 
5047         return NULL;
5048 }
5049 
5050 static __be32
5051 nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
5052 {
5053         __be32 status;
5054 
5055         status = nfsd4_check_openowner_confirmed(ols);
5056         if (status)
5057                 return status;
5058         return nfs4_check_openmode(ols, flags);
5059 }
5060 
5061 static __be32
5062 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5063                 struct file **filpp, bool *tmp_file, int flags)
5064 {
5065         int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5066         struct file *file;
5067         __be32 status;
5068 
5069         file = nfs4_find_file(s, flags);
5070         if (file) {
5071                 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5072                                 acc | NFSD_MAY_OWNER_OVERRIDE);
5073                 if (status) {
5074                         fput(file);
5075                         return status;
5076                 }
5077 
5078                 *filpp = file;
5079         } else {
5080                 status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
5081                 if (status)
5082                         return status;
5083 
5084                 if (tmp_file)
5085                         *tmp_file = true;
5086         }
5087 
5088         return 0;
5089 }
5090 
5091 /*
5092  * Checks for stateid operations
5093  */
5094 __be32
5095 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5096                 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5097                 stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
5098 {
5099         struct inode *ino = d_inode(fhp->fh_dentry);
5100         struct net *net = SVC_NET(rqstp);
5101         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5102         struct nfs4_stid *s = NULL;
5103         __be32 status;
5104 
5105         if (filpp)
5106                 *filpp = NULL;
5107         if (tmp_file)
5108                 *tmp_file = false;
5109 
5110         if (grace_disallows_io(net, ino))
5111                 return nfserr_grace;
5112 
5113         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5114                 status = check_special_stateids(net, fhp, stateid, flags);
5115                 goto done;
5116         }
5117 
5118         status = nfsd4_lookup_stateid(cstate, stateid,
5119                                 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5120                                 &s, nn);
5121         if (status)
5122                 return status;
5123         status = nfsd4_stid_check_stateid_generation(stateid, s,
5124                         nfsd4_has_session(cstate));
5125         if (status)
5126                 goto out;
5127 
5128         switch (s->sc_type) {
5129         case NFS4_DELEG_STID:
5130                 status = nfs4_check_delegmode(delegstateid(s), flags);
5131                 break;
5132         case NFS4_OPEN_STID:
5133         case NFS4_LOCK_STID:
5134                 status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
5135                 break;
5136         default:
5137                 status = nfserr_bad_stateid;
5138                 break;
5139         }
5140         if (status)
5141                 goto out;
5142         status = nfs4_check_fh(fhp, s);
5143 
5144 done:
5145         if (!status && filpp)
5146                 status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
5147 out:
5148         if (s)
5149                 nfs4_put_stid(s);
5150         return status;
5151 }
5152 
5153 /*
5154  * Test if the stateid is valid
5155  */
5156 __be32
5157 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5158                    union nfsd4_op_u *u)
5159 {
5160         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5161         struct nfsd4_test_stateid_id *stateid;
5162         struct nfs4_client *cl = cstate->session->se_client;
5163 
5164         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5165                 stateid->ts_id_status =
5166                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5167 
5168         return nfs_ok;
5169 }
5170 
5171 static __be32
5172 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5173 {
5174         struct nfs4_ol_stateid *stp = openlockstateid(s);
5175         __be32 ret;
5176 
5177         ret = nfsd4_lock_ol_stateid(stp);
5178         if (ret)
5179                 goto out_put_stid;
5180 
5181         ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5182         if (ret)
5183                 goto out;
5184 
5185         ret = nfserr_locks_held;
5186         if (check_for_locks(stp->st_stid.sc_file,
5187                             lockowner(stp->st_stateowner)))
5188                 goto out;
5189 
5190         release_lock_stateid(stp);
5191         ret = nfs_ok;
5192 
5193 out:
5194         mutex_unlock(&stp->st_mutex);
5195 out_put_stid:
5196         nfs4_put_stid(s);
5197         return ret;
5198 }
5199 
5200 __be32
5201 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5202                    union nfsd4_op_u *u)
5203 {
5204         struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
5205         stateid_t *stateid = &free_stateid->fr_stateid;
5206         struct nfs4_stid *s;
5207         struct nfs4_delegation *dp;
5208         struct nfs4_client *cl = cstate->session->se_client;
5209         __be32 ret = nfserr_bad_stateid;
5210 
5211         spin_lock(&cl->cl_lock);
5212         s = find_stateid_locked(cl, stateid);
5213         if (!s)
5214                 goto out_unlock;
5215         spin_lock(&s->sc_lock);
5216         switch (s->sc_type) {
5217         case NFS4_DELEG_STID:
5218                 ret = nfserr_locks_held;
5219                 break;
5220         case NFS4_OPEN_STID:
5221                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5222                 if (ret)
5223                         break;
5224                 ret = nfserr_locks_held;
5225                 break;
5226         case NFS4_LOCK_STID:
5227                 spin_unlock(&s->sc_lock);
5228                 refcount_inc(&s->sc_count);
5229                 spin_unlock(&cl->cl_lock);
5230                 ret = nfsd4_free_lock_stateid(stateid, s);
5231                 goto out;
5232         case NFS4_REVOKED_DELEG_STID:
5233                 spin_unlock(&s->sc_lock);
5234                 dp = delegstateid(s);
5235                 list_del_init(&dp->dl_recall_lru);
5236                 spin_unlock(&cl->cl_lock);
5237                 nfs4_put_stid(s);
5238                 ret = nfs_ok;
5239                 goto out;
5240         /* Default falls through and returns nfserr_bad_stateid */
5241         }
5242         spin_unlock(&s->sc_lock);
5243 out_unlock:
5244         spin_unlock(&cl->cl_lock);
5245 out:
5246         return ret;
5247 }
5248 
5249 static inline int
5250 setlkflg (int type)
5251 {
5252         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5253                 RD_STATE : WR_STATE;
5254 }
5255 
5256 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5257 {
5258         struct svc_fh *current_fh = &cstate->current_fh;
5259         struct nfs4_stateowner *sop = stp->st_stateowner;
5260         __be32 status;
5261 
5262         status = nfsd4_check_seqid(cstate, sop, seqid);
5263         if (status)
5264                 return status;
5265         status = nfsd4_lock_ol_stateid(stp);
5266         if (status != nfs_ok)
5267                 return status;
5268         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5269         if (status == nfs_ok)
5270                 status = nfs4_check_fh(current_fh, &stp->st_stid);
5271         if (status != nfs_ok)
5272                 mutex_unlock(&stp->st_mutex);
5273         return status;
5274 }
5275 
5276 /* 
5277  * Checks for sequence id mutating operations. 
5278  */
5279 static __be32
5280 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5281                          stateid_t *stateid, char typemask,
5282                          struct nfs4_ol_stateid **stpp,
5283                          struct nfsd_net *nn)
5284 {
5285         __be32 status;
5286         struct nfs4_stid *s;
5287         struct nfs4_ol_stateid *stp = NULL;
5288 
5289         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5290                 seqid, STATEID_VAL(stateid));
5291 
5292         *stpp = NULL;
5293         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5294         if (status)
5295                 return status;
5296         stp = openlockstateid(s);
5297         nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5298 
5299         status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5300         if (!status)
5301                 *stpp = stp;
5302         else
5303                 nfs4_put_stid(&stp->st_stid);
5304         return status;
5305 }
5306 
5307 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5308                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5309 {
5310         __be32 status;
5311         struct nfs4_openowner *oo;
5312         struct nfs4_ol_stateid *stp;
5313 
5314         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5315                                                 NFS4_OPEN_STID, &stp, nn);
5316         if (status)
5317                 return status;
5318         oo = openowner(stp->st_stateowner);
5319         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5320                 mutex_unlock(&stp->st_mutex);
5321                 nfs4_put_stid(&stp->st_stid);
5322                 return nfserr_bad_stateid;
5323         }
5324         *stpp = stp;
5325         return nfs_ok;
5326 }
5327 
5328 __be32
5329 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5330                    union nfsd4_op_u *u)
5331 {
5332         struct nfsd4_open_confirm *oc = &u->open_confirm;
5333         __be32 status;
5334         struct nfs4_openowner *oo;
5335         struct nfs4_ol_stateid *stp;
5336         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5337 
5338         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5339                         cstate->current_fh.fh_dentry);
5340 
5341         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5342         if (status)
5343                 return status;
5344 
5345         status = nfs4_preprocess_seqid_op(cstate,
5346                                         oc->oc_seqid, &oc->oc_req_stateid,
5347                                         NFS4_OPEN_STID, &stp, nn);
5348         if (status)
5349                 goto out;
5350         oo = openowner(stp->st_stateowner);
5351         status = nfserr_bad_stateid;
5352         if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5353                 mutex_unlock(&stp->st_mutex);
5354                 goto put_stateid;
5355         }
5356         oo->oo_flags |= NFS4_OO_CONFIRMED;
5357         nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5358         mutex_unlock(&stp->st_mutex);
5359         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5360                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5361 
5362         nfsd4_client_record_create(oo->oo_owner.so_client);
5363         status = nfs_ok;
5364 put_stateid:
5365         nfs4_put_stid(&stp->st_stid);
5366 out:
5367         nfsd4_bump_seqid(cstate, status);
5368         return status;
5369 }
5370 
5371 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5372 {
5373         if (!test_access(access, stp))
5374                 return;
5375         nfs4_file_put_access(stp->st_stid.sc_file, access);
5376         clear_access(access, stp);
5377 }
5378 
5379 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5380 {
5381         switch (to_access) {
5382         case NFS4_SHARE_ACCESS_READ:
5383                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5384                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5385                 break;
5386         case NFS4_SHARE_ACCESS_WRITE:
5387                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5388                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5389                 break;
5390         case NFS4_SHARE_ACCESS_BOTH:
5391                 break;
5392         default:
5393                 WARN_ON_ONCE(1);
5394         }
5395 }
5396 
5397 __be32
5398 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5399                      struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
5400 {
5401         struct nfsd4_open_downgrade *od = &u->open_downgrade;
5402         __be32 status;
5403         struct nfs4_ol_stateid *stp;
5404         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5405 
5406         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", 
5407                         cstate->current_fh.fh_dentry);
5408 
5409         /* We don't yet support WANT bits: */
5410         if (od->od_deleg_want)
5411                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5412                         od->od_deleg_want);
5413 
5414         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5415                                         &od->od_stateid, &stp, nn);
5416         if (status)
5417                 goto out; 
5418         status = nfserr_inval;
5419         if (!test_access(od->od_share_access, stp)) {
5420                 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5421                         stp->st_access_bmap, od->od_share_access);
5422                 goto put_stateid;
5423         }
5424         if (!test_deny(od->od_share_deny, stp)) {
5425                 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5426                         stp->st_deny_bmap, od->od_share_deny);
5427                 goto put_stateid;
5428         }
5429         nfs4_stateid_downgrade(stp, od->od_share_access);
5430         reset_union_bmap_deny(od->od_share_deny, stp);
5431         nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5432         status = nfs_ok;
5433 put_stateid:
5434         mutex_unlock(&stp->st_mutex);
5435         nfs4_put_stid(&stp->st_stid);
5436 out:
5437         nfsd4_bump_seqid(cstate, status);
5438         return status;
5439 }
5440 
5441 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5442 {
5443         struct nfs4_client *clp = s->st_stid.sc_client;
5444         bool unhashed;
5445         LIST_HEAD(reaplist);
5446 
5447         spin_lock(&clp->cl_lock);
5448         unhashed = unhash_open_stateid(s, &reaplist);
5449 
5450         if (clp->cl_minorversion) {
5451                 if (unhashed)
5452                         put_ol_stateid_locked(s, &reaplist);
5453                 spin_unlock(&clp->cl_lock);
5454                 free_ol_stateid_reaplist(&reaplist);
5455         } else {
5456                 spin_unlock(&clp->cl_lock);
5457                 free_ol_stateid_reaplist(&reaplist);
5458                 if (unhashed)
5459                         move_to_close_lru(s, clp->net);
5460         }
5461 }
5462 
5463 /*
5464  * nfs4_unlock_state() called after encode
5465  */
5466 __be32
5467 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5468                 union nfsd4_op_u *u)
5469 {
5470         struct nfsd4_close *close = &u->close;
5471         __be32 status;
5472         struct nfs4_ol_stateid *stp;
5473         struct net *net = SVC_NET(rqstp);
5474         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5475 
5476         dprintk("NFSD: nfsd4_close on file %pd\n", 
5477                         cstate->current_fh.fh_dentry);
5478 
5479         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5480                                         &close->cl_stateid,
5481                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
5482                                         &stp, nn);
5483         nfsd4_bump_seqid(cstate, status);
5484         if (status)
5485                 goto out; 
5486 
5487         stp->st_stid.sc_type = NFS4_CLOSED_STID;
5488 
5489         /*
5490          * Technically we don't _really_ have to increment or copy it, since
5491          * it should just be gone after this operation and we clobber the
5492          * copied value below, but we continue to do so here just to ensure
5493          * that racing ops see that there was a state change.
5494          */
5495         nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
5496 
5497         nfsd4_close_open_stateid(stp);
5498         mutex_unlock(&stp->st_mutex);
5499 
5500         /* v4.1+ suggests that we send a special stateid in here, since the
5501          * clients should just ignore this anyway. Since this is not useful
5502          * for v4.0 clients either, we set it to the special close_stateid
5503          * universally.
5504          *
5505          * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
5506          */
5507         memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
5508 
5509         /* put reference from nfs4_preprocess_seqid_op */
5510         nfs4_put_stid(&stp->st_stid);
5511 out:
5512         return status;
5513 }
5514 
5515 __be32
5516 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5517                   union nfsd4_op_u *u)
5518 {
5519         struct nfsd4_delegreturn *dr = &u->delegreturn;
5520         struct nfs4_delegation *dp;
5521         stateid_t *stateid = &dr->dr_stateid;
5522         struct nfs4_stid *s;
5523         __be32 status;
5524         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5525 
5526         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5527                 return status;
5528 
5529         status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
5530         if (status)
5531                 goto out;
5532         dp = delegstateid(s);
5533         status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
5534         if (status)
5535                 goto put_stateid;
5536 
5537         destroy_delegation(dp);
5538 put_stateid:
5539         nfs4_put_stid(&dp->dl_stid);
5540 out:
5541         return status;
5542 }
5543 
5544 static inline u64
5545 end_offset(u64 start, u64 len)
5546 {
5547         u64 end;
5548 
5549         end = start + len;
5550         return end >= start ? end: NFS4_MAX_UINT64;
5551 }
5552 
5553 /* last octet in a range */
5554 static inline u64
5555 last_byte_offset(u64 start, u64 len)
5556 {
5557         u64 end;
5558 
5559         WARN_ON_ONCE(!len);
5560         end = start + len;
5561         return end > start ? end - 1: NFS4_MAX_UINT64;
5562 }
5563 
5564 /*
5565  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5566  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5567  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
5568  * locking, this prevents us from being completely protocol-compliant.  The
5569  * real solution to this problem is to start using unsigned file offsets in
5570  * the VFS, but this is a very deep change!
5571  */
5572 static inline void
5573 nfs4_transform_lock_offset(struct file_lock *lock)
5574 {
5575         if (lock->fl_start < 0)
5576                 lock->fl_start = OFFSET_MAX;
5577         if (lock->fl_end < 0)
5578                 lock->fl_end = OFFSET_MAX;
5579 }
5580 
5581 static fl_owner_t
5582 nfsd4_fl_get_owner(fl_owner_t owner)
5583 {
5584         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5585 
5586         nfs4_get_stateowner(&lo->lo_owner);
5587         return owner;
5588 }
5589 
5590 static void
5591 nfsd4_fl_put_owner(fl_owner_t owner)
5592 {
5593         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5594 
5595         if (lo)
5596                 nfs4_put_stateowner(&lo->lo_owner);
5597 }
5598 
5599 static void
5600 nfsd4_lm_notify(struct file_lock *fl)
5601 {
5602         struct nfs4_lockowner           *lo = (struct nfs4_lockowner *)fl->fl_owner;
5603         struct net                      *net = lo->lo_owner.so_client->net;
5604         struct nfsd_net                 *nn = net_generic(net, nfsd_net_id);
5605         struct nfsd4_blocked_lock       *nbl = container_of(fl,
5606                                                 struct nfsd4_blocked_lock, nbl_lock);
5607         bool queue = false;
5608 
5609         /* An empty list means that something else is going to be using it */
5610         spin_lock(&nn->blocked_locks_lock);
5611         if (!list_empty(&nbl->nbl_list)) {
5612                 list_del_init(&nbl->nbl_list);
5613                 list_del_init(&nbl->nbl_lru);
5614                 queue = true;
5615         }
5616         spin_unlock(&nn->blocked_locks_lock);
5617 
5618         if (queue)
5619                 nfsd4_run_cb(&nbl->nbl_cb);
5620 }
5621 
5622 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
5623         .lm_notify = nfsd4_lm_notify,
5624         .lm_get_owner = nfsd4_fl_get_owner,
5625         .lm_put_owner = nfsd4_fl_put_owner,
5626 };
5627 
5628 static inline void
5629 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
5630 {
5631         struct nfs4_lockowner *lo;
5632 
5633         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
5634                 lo = (struct nfs4_lockowner *) fl->fl_owner;
5635                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
5636                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
5637                 if (!deny->ld_owner.data)
5638                         /* We just don't care that much */
5639                         goto nevermind;
5640                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
5641                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
5642         } else {
5643 nevermind:
5644                 deny->ld_owner.len = 0;
5645                 deny->ld_owner.data = NULL;
5646                 deny->ld_clientid.cl_boot = 0;
5647                 deny->ld_clientid.cl_id = 0;
5648         }
5649         deny->ld_start = fl->fl_start;
5650         deny->ld_length = NFS4_MAX_UINT64;
5651         if (fl->fl_end != NFS4_MAX_UINT64)
5652                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
5653         deny->ld_type = NFS4_READ_LT;
5654         if (fl->fl_type != F_RDLCK)
5655                 deny->ld_type = NFS4_WRITE_LT;
5656 }
5657 
5658 static struct nfs4_lockowner *
5659 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
5660 {
5661         unsigned int strhashval = ownerstr_hashval(owner);
5662         struct nfs4_stateowner *so;
5663 
5664         lockdep_assert_held(&clp->cl_lock);
5665 
5666         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
5667                             so_strhash) {
5668                 if (so->so_is_open_owner)
5669                         continue;
5670                 if (same_owner_str(so, owner))
5671                         return lockowner(nfs4_get_stateowner(so));
5672         }
5673         return NULL;
5674 }
5675 
5676 static struct nfs4_lockowner *
5677 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
5678 {
5679         struct nfs4_lockowner *lo;
5680 
5681         spin_lock(&clp->cl_lock);
5682         lo = find_lockowner_str_locked(clp, owner);
5683         spin_unlock(&clp->cl_lock);
5684         return lo;
5685 }
5686 
5687 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
5688 {
5689         unhash_lockowner_locked(lockowner(sop));
5690 }
5691 
5692 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
5693 {
5694         struct nfs4_lockowner *lo = lockowner(sop);
5695 
5696         kmem_cache_free(lockowner_slab, lo);
5697 }
5698 
5699 static const struct nfs4_stateowner_operations lockowner_ops = {
5700         .so_unhash =    nfs4_unhash_lockowner,
5701         .so_free =      nfs4_free_lockowner,
5702 };
5703 
5704 /*
5705  * Alloc a lock owner structure.
5706  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
5707  * occurred. 
5708  *
5709  * strhashval = ownerstr_hashval
5710  */
5711 static struct nfs4_lockowner *
5712 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5713                            struct nfs4_ol_stateid *open_stp,
5714                            struct nfsd4_lock *lock)
5715 {
5716         struct nfs4_lockowner *lo, *ret;
5717 
5718         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5719         if (!lo)
5720                 return NULL;
5721         INIT_LIST_HEAD(&lo->lo_blocked);
5722         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5723         lo->lo_owner.so_is_open_owner = 0;
5724         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5725         lo->lo_owner.so_ops = &lockowner_ops;
5726         spin_lock(&clp->cl_lock);
5727         ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
5728         if (ret == NULL) {
5729                 list_add(&lo->lo_owner.so_strhash,
5730                          &clp->cl_ownerstr_hashtbl[strhashval]);
5731                 ret = lo;
5732         } else
5733                 nfs4_free_stateowner(&lo->lo_owner);
5734 
5735         spin_unlock(&clp->cl_lock);
5736         return ret;
5737 }
5738 
5739 static struct nfs4_ol_stateid *
5740 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5741 {
5742         struct nfs4_ol_stateid *lst;
5743         struct nfs4_client *clp = lo->lo_owner.so_client;
5744 
5745         lockdep_assert_held(&clp->cl_lock);
5746 
5747         list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5748                 if (lst->st_stid.sc_type != NFS4_LOCK_STID)
5749                         continue;
5750                 if (lst->st_stid.sc_file == fp) {
5751                         refcount_inc(&lst->st_stid.sc_count);
5752                         return lst;
5753                 }
5754         }
5755         return NULL;
5756 }
5757 
5758 static struct nfs4_ol_stateid *
5759 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5760                   struct nfs4_file *fp, struct inode *inode,
5761                   struct nfs4_ol_stateid *open_stp)
5762 {
5763         struct nfs4_client *clp = lo->lo_owner.so_client;
5764         struct nfs4_ol_stateid *retstp;
5765 
5766         mutex_init(&stp->st_mutex);
5767         mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
5768 retry:
5769         spin_lock(&clp->cl_lock);
5770         spin_lock(&fp->fi_lock);
5771         retstp = find_lock_stateid(lo, fp);
5772         if (retstp)
5773                 goto out_unlock;
5774 
5775         refcount_inc(&stp->st_stid.sc_count);
5776         stp->st_stid.sc_type = NFS4_LOCK_STID;
5777         stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
5778         get_nfs4_file(fp);
5779         stp->st_stid.sc_file = fp;
5780         stp->st_access_bmap = 0;
5781         stp->st_deny_bmap = open_stp->st_deny_bmap;
5782         stp->st_openstp = open_stp;
5783         list_add(&stp->st_locks, &open_stp->st_locks);
5784         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5785         list_add(&stp->st_perfile, &fp->fi_stateids);
5786 out_unlock:
5787         spin_unlock(&fp->fi_lock);
5788         spin_unlock(&clp->cl_lock);
5789         if (retstp) {
5790                 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
5791                         nfs4_put_stid(&retstp->st_stid);
5792                         goto retry;
5793                 }
5794                 /* To keep mutex tracking happy */
5795                 mutex_unlock(&stp->st_mutex);
5796                 stp = retstp;
5797         }
5798         return stp;
5799 }
5800 
5801 static struct nfs4_ol_stateid *
5802 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5803                             struct inode *inode, struct nfs4_ol_stateid *ost,
5804                             bool *new)
5805 {
5806         struct nfs4_stid *ns = NULL;
5807         struct nfs4_ol_stateid *lst;
5808         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5809         struct nfs4_client *clp = oo->oo_owner.so_client;
5810 
5811         *new = false;
5812         spin_lock(&clp->cl_lock);
5813         lst = find_lock_stateid(lo, fi);
5814         spin_unlock(&clp->cl_lock);
5815         if (lst != NULL) {
5816                 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
5817                         goto out;
5818                 nfs4_put_stid(&lst->st_stid);
5819         }
5820         ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
5821         if (ns == NULL)
5822                 return NULL;
5823 
5824         lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
5825         if (lst == openlockstateid(ns))
5826                 *new = true;
5827         else
5828                 nfs4_put_stid(ns);
5829 out:
5830         return lst;
5831 }
5832 
5833 static int
5834 check_lock_length(u64 offset, u64 length)
5835 {
5836         return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5837                 (length > ~offset)));
5838 }
5839 
5840 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5841 {
5842         struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5843 
5844         lockdep_assert_held(&fp->fi_lock);
5845 
5846         if (test_access(access, lock_stp))
5847                 return;
5848         __nfs4_file_get_access(fp, access);
5849         set_access(access, lock_stp);
5850 }
5851 
5852 static __be32
5853 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5854                             struct nfs4_ol_stateid *ost,
5855                             struct nfsd4_lock *lock,
5856                             struct nfs4_ol_stateid **plst, bool *new)
5857 {
5858         __be32 status;
5859         struct nfs4_file *fi = ost->st_stid.sc_file;
5860         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5861         struct nfs4_client *cl = oo->oo_owner.so_client;
5862         struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
5863         struct nfs4_lockowner *lo;
5864         struct nfs4_ol_stateid *lst;
5865         unsigned int strhashval;
5866 
5867         lo = find_lockowner_str(cl, &lock->lk_new_owner);
5868         if (!lo) {
5869                 strhashval = ownerstr_hashval(&lock->lk_new_owner);
5870                 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5871                 if (lo == NULL)
5872                         return nfserr_jukebox;
5873         } else {
5874                 /* with an existing lockowner, seqids must be the same */
5875                 status = nfserr_bad_seqid;
5876                 if (!cstate->minorversion &&
5877                     lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5878                         goto out;
5879         }
5880 
5881         lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5882         if (lst == NULL) {
5883                 status = nfserr_jukebox;
5884                 goto out;
5885         }
5886 
5887         status = nfs_ok;
5888         *plst = lst;
5889 out:
5890         nfs4_put_stateowner(&lo->lo_owner);
5891         return status;
5892 }
5893 
5894 /*
5895  *  LOCK operation 
5896  */
5897 __be32
5898 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5899            union nfsd4_op_u *u)
5900 {
5901         struct nfsd4_lock *lock = &u->lock;
5902         struct nfs4_openowner *open_sop = NULL;
5903         struct nfs4_lockowner *lock_sop = NULL;
5904         struct nfs4_ol_stateid *lock_stp = NULL;
5905         struct nfs4_ol_stateid *open_stp = NULL;
5906         struct nfs4_file *fp;
5907         struct file *filp = NULL;
5908         struct nfsd4_blocked_lock *nbl = NULL;
5909         struct file_lock *file_lock = NULL;
5910         struct file_lock *conflock = NULL;
5911         __be32 status = 0;
5912         int lkflg;
5913         int err;
5914         bool new = false;
5915         unsigned char fl_type;
5916         unsigned int fl_flags = FL_POSIX;
5917         struct net *net = SVC_NET(rqstp);
5918         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5919 
5920         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5921                 (long long) lock->lk_offset,
5922                 (long long) lock->lk_length);
5923 
5924         if (check_lock_length(lock->lk_offset, lock->lk_length))
5925                  return nfserr_inval;
5926 
5927         if ((status = fh_verify(rqstp, &cstate->current_fh,
5928                                 S_IFREG, NFSD_MAY_LOCK))) {
5929                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5930                 return status;
5931         }
5932 
5933         if (lock->lk_is_new) {
5934                 if (nfsd4_has_session(cstate))
5935                         /* See rfc 5661 18.10.3: given clientid is ignored: */
5936                         memcpy(&lock->lk_new_clientid,
5937                                 &cstate->session->se_client->cl_clientid,
5938                                 sizeof(clientid_t));
5939 
5940                 status = nfserr_stale_clientid;
5941                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5942                         goto out;
5943 
5944                 /* validate and update open stateid and open seqid */
5945                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5946                                         lock->lk_new_open_seqid,
5947                                         &lock->lk_new_open_stateid,
5948                                         &open_stp, nn);
5949                 if (status)
5950                         goto out;
5951                 mutex_unlock(&open_stp->st_mutex);
5952                 open_sop = openowner(open_stp->st_stateowner);
5953                 status = nfserr_bad_stateid;
5954                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5955                                                 &lock->lk_new_clientid))
5956                         goto out;
5957                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5958                                                         &lock_stp, &new);
5959         } else {
5960                 status = nfs4_preprocess_seqid_op(cstate,
5961                                        lock->lk_old_lock_seqid,
5962                                        &lock->lk_old_lock_stateid,
5963                                        NFS4_LOCK_STID, &lock_stp, nn);
5964         }
5965         if (status)
5966                 goto out;
5967         lock_sop = lockowner(lock_stp->st_stateowner);
5968 
5969         lkflg = setlkflg(lock->lk_type);
5970         status = nfs4_check_openmode(lock_stp, lkflg);
5971         if (status)
5972                 goto out;
5973 
5974         status = nfserr_grace;
5975         if (locks_in_grace(net) && !lock->lk_reclaim)
5976                 goto out;
5977         status = nfserr_no_grace;
5978         if (!locks_in_grace(net) && lock->lk_reclaim)
5979                 goto out;
5980 
5981         fp = lock_stp->st_stid.sc_file;
5982         switch (lock->lk_type) {
5983                 case NFS4_READW_LT:
5984                         if (nfsd4_has_session(cstate))
5985                                 fl_flags |= FL_SLEEP;
5986                         /* Fallthrough */
5987                 case NFS4_READ_LT:
5988                         spin_lock(&fp->fi_lock);
5989                         filp = find_readable_file_locked(fp);
5990                         if (filp)
5991                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
5992                         spin_unlock(&fp->fi_lock);
5993                         fl_type = F_RDLCK;
5994                         break;
5995                 case NFS4_WRITEW_LT:
5996                         if (nfsd4_has_session(cstate))
5997                                 fl_flags |= FL_SLEEP;
5998                         /* Fallthrough */
5999                 case NFS4_WRITE_LT:
6000                         spin_lock(&fp->fi_lock);
6001                         filp = find_writeable_file_locked(fp);
6002                         if (filp)
6003                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
6004                         spin_unlock(&fp->fi_lock);
6005                         fl_type = F_WRLCK;
6006                         break;
6007                 default:
6008                         status = nfserr_inval;
6009                 goto out;
6010         }
6011 
6012         if (!filp) {
6013                 status = nfserr_openmode;
6014                 goto out;
6015         }
6016 
6017         nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6018         if (!nbl) {
6019                 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6020                 status = nfserr_jukebox;
6021                 goto out;
6022         }
6023 
6024         file_lock = &nbl->nbl_lock;
6025         file_lock->fl_type = fl_type;
6026         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6027         file_lock->fl_pid = current->tgid;
6028         file_lock->fl_file = filp;
6029         file_lock->fl_flags = fl_flags;
6030         file_lock->fl_lmops = &nfsd_posix_mng_ops;
6031         file_lock->fl_start = lock->lk_offset;
6032         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6033         nfs4_transform_lock_offset(file_lock);
6034 
6035         conflock = locks_alloc_lock();
6036         if (!conflock) {
6037                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6038                 status = nfserr_jukebox;
6039                 goto out;
6040         }
6041 
6042         if (fl_flags & FL_SLEEP) {
6043                 nbl->nbl_time = jiffies;
6044                 spin_lock(&nn->blocked_locks_lock);
6045                 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6046                 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6047                 spin_unlock(&nn->blocked_locks_lock);
6048         }
6049 
6050         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
6051         switch (err) {
6052         case 0: /* success! */
6053                 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6054                 status = 0;
6055                 break;
6056         case FILE_LOCK_DEFERRED:
6057                 nbl = NULL;
6058                 /* Fallthrough */
6059         case -EAGAIN:           /* conflock holds conflicting lock */
6060                 status = nfserr_denied;
6061                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6062                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6063                 break;
6064         case -EDEADLK:
6065                 status = nfserr_deadlock;
6066                 break;
6067         default:
6068                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6069                 status = nfserrno(err);
6070                 break;
6071         }
6072 out:
6073         if (nbl) {
6074                 /* dequeue it if we queued it before */
6075                 if (fl_flags & FL_SLEEP) {
6076                         spin_lock(&nn->blocked_locks_lock);
6077                         list_del_init(&nbl->nbl_list);
6078                         list_del_init(&nbl->nbl_lru);
6079                         spin_unlock(&nn->blocked_locks_lock);
6080                 }
6081                 free_blocked_lock(nbl);
6082         }
6083         if (filp)
6084                 fput(filp);
6085         if (lock_stp) {
6086                 /* Bump seqid manually if the 4.0 replay owner is openowner */
6087                 if (cstate->replay_owner &&
6088                     cstate->replay_owner != &lock_sop->lo_owner &&
6089                     seqid_mutating_err(ntohl(status)))
6090                         lock_sop->lo_owner.so_seqid++;
6091 
6092                 /*
6093                  * If this is a new, never-before-used stateid, and we are
6094                  * returning an error, then just go ahead and release it.
6095                  */
6096                 if (status && new)
6097                         release_lock_stateid(lock_stp);
6098 
6099                 mutex_unlock(&lock_stp->st_mutex);
6100 
6101                 nfs4_put_stid(&lock_stp->st_stid);
6102         }
6103         if (open_stp)
6104                 nfs4_put_stid(&open_stp->st_stid);
6105         nfsd4_bump_seqid(cstate, status);
6106         if (conflock)
6107                 locks_free_lock(conflock);
6108         return status;
6109 }
6110 
6111 /*
6112  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6113  * so we do a temporary open here just to get an open file to pass to
6114  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
6115  * inode operation.)
6116  */
6117 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6118 {
6119         struct file *file;
6120         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
6121         if (!err) {
6122                 err = nfserrno(vfs_test_lock(file, lock));
6123                 fput(file);
6124         }
6125         return err;
6126 }
6127 
6128 /*
6129  * LOCKT operation
6130  */
6131 __be32
6132 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6133             union nfsd4_op_u *u)
6134 {
6135         struct nfsd4_lockt *lockt = &u->lockt;
6136         struct file_lock *file_lock = NULL;
6137         struct nfs4_lockowner *lo = NULL;
6138         __be32 status;
6139         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6140 
6141         if (locks_in_grace(SVC_NET(rqstp)))
6142                 return nfserr_grace;
6143 
6144         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6145                  return nfserr_inval;
6146 
6147         if (!nfsd4_has_session(cstate)) {
6148                 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
6149                 if (status)
6150                         goto out;
6151         }
6152 
6153         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6154                 goto out;
6155 
6156         file_lock = locks_alloc_lock();
6157         if (!file_lock) {
6158                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6159                 status = nfserr_jukebox;
6160                 goto out;
6161         }
6162 
6163         switch (lockt->lt_type) {
6164                 case NFS4_READ_LT:
6165                 case NFS4_READW_LT:
6166                         file_lock->fl_type = F_RDLCK;
6167                 break;
6168                 case NFS4_WRITE_LT:
6169                 case NFS4_WRITEW_LT:
6170                         file_lock->fl_type = F_WRLCK;
6171                 break;
6172                 default:
6173                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6174                         status = nfserr_inval;
6175                 goto out;
6176         }
6177 
6178         lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6179         if (lo)
6180                 file_lock->fl_owner = (fl_owner_t)lo;
6181         file_lock->fl_pid = current->tgid;
6182         file_lock->fl_flags = FL_POSIX;
6183 
6184         file_lock->fl_start = lockt->lt_offset;
6185         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6186 
6187         nfs4_transform_lock_offset(file_lock);
6188 
6189         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6190         if (status)
6191                 goto out;
6192 
6193         if (file_lock->fl_type != F_UNLCK) {
6194                 status = nfserr_denied;
6195                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6196         }
6197 out:
6198         if (lo)
6199                 nfs4_put_stateowner(&lo->lo_owner);
6200         if (file_lock)
6201                 locks_free_lock(file_lock);
6202         return status;
6203 }
6204 
6205 __be32
6206 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6207             union nfsd4_op_u *u)
6208 {
6209         struct nfsd4_locku *locku = &u->locku;
6210         struct nfs4_ol_stateid *stp;
6211         struct file *filp = NULL;
6212         struct file_lock *file_lock = NULL;
6213         __be32 status;
6214         int err;
6215         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6216 
6217         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6218                 (long long) locku->lu_offset,
6219                 (long long) locku->lu_length);
6220 
6221         if (check_lock_length(locku->lu_offset, locku->lu_length))
6222                  return nfserr_inval;
6223 
6224         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6225                                         &locku->lu_stateid, NFS4_LOCK_STID,
6226                                         &stp, nn);
6227         if (status)
6228                 goto out;
6229         filp = find_any_file(stp->st_stid.sc_file);
6230         if (!filp) {
6231                 status = nfserr_lock_range;
6232                 goto put_stateid;
6233         }
6234         file_lock = locks_alloc_lock();
6235         if (!file_lock) {
6236                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6237                 status = nfserr_jukebox;
6238                 goto fput;
6239         }
6240 
6241         file_lock->fl_type = F_UNLCK;
6242         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6243         file_lock->fl_pid = current->tgid;
6244         file_lock->fl_file = filp;
6245         file_lock->fl_flags = FL_POSIX;
6246         file_lock->fl_lmops = &nfsd_posix_mng_ops;
6247         file_lock->fl_start = locku->lu_offset;
6248 
6249         file_lock->fl_end = last_byte_offset(locku->lu_offset,
6250                                                 locku->lu_length);
6251         nfs4_transform_lock_offset(file_lock);
6252 
6253         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
6254         if (err) {
6255                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6256                 goto out_nfserr;
6257         }
6258         nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6259 fput:
6260         fput(filp);
6261 put_stateid:
6262         mutex_unlock(&stp->st_mutex);
6263         nfs4_put_stid(&stp->st_stid);
6264 out:
6265         nfsd4_bump_seqid(cstate, status);
6266         if (file_lock)
6267                 locks_free_lock(file_lock);
6268         return status;
6269 
6270 out_nfserr:
6271         status = nfserrno(err);
6272         goto fput;
6273 }
6274 
6275 /*
6276  * returns
6277  *      true:  locks held by lockowner
6278  *      false: no locks held by lockowner
6279  */
6280 static bool
6281 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6282 {
6283         struct file_lock *fl;
6284         int status = false;
6285         struct file *filp = find_any_file(fp);
6286         struct inode *inode;
6287         struct file_lock_context *flctx;
6288 
6289         if (!filp) {
6290                 /* Any valid lock stateid should have some sort of access */
6291                 WARN_ON_ONCE(1);
6292                 return status;
6293         }
6294 
6295         inode = locks_inode(filp);
6296         flctx = inode->i_flctx;
6297 
6298         if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6299                 spin_lock(&flctx->flc_lock);
6300                 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6301                         if (fl->fl_owner == (fl_owner_t)lowner) {
6302                                 status = true;
6303                                 break;
6304                         }
6305                 }
6306                 spin_unlock(&flctx->flc_lock);
6307         }
6308         fput(filp);
6309         return status;
6310 }
6311 
6312 __be32
6313 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6314                         struct nfsd4_compound_state *cstate,
6315                         union nfsd4_op_u *u)
6316 {
6317         struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
6318         clientid_t *clid = &rlockowner->rl_clientid;
6319         struct nfs4_stateowner *sop;
6320         struct nfs4_lockowner *lo = NULL;
6321         struct nfs4_ol_stateid *stp;
6322         struct xdr_netobj *owner = &rlockowner->rl_owner;
6323         unsigned int hashval = ownerstr_hashval(owner);
6324         __be32 status;
6325         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6326         struct nfs4_client *clp;
6327         LIST_HEAD (reaplist);
6328 
6329         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6330                 clid->cl_boot, clid->cl_id);
6331 
6332         status = lookup_clientid(clid, cstate, nn);
6333         if (status)
6334                 return status;
6335 
6336         clp = cstate->clp;
6337         /* Find the matching lock stateowner */
6338         spin_lock(&clp->cl_lock);
6339         list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
6340                             so_strhash) {
6341 
6342                 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
6343                         continue;
6344 
6345                 /* see if there are still any locks associated with it */
6346                 lo = lockowner(sop);
6347                 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
6348                         if (check_for_locks(stp->st_stid.sc_file, lo)) {
6349                                 status = nfserr_locks_held;
6350                                 spin_unlock(&clp->cl_lock);
6351                                 return status;
6352                         }
6353                 }
6354 
6355                 nfs4_get_stateowner(sop);
6356                 break;
6357         }
6358         if (!lo) {
6359                 spin_unlock(&clp->cl_lock);
6360                 return status;
6361         }
6362 
6363         unhash_lockowner_locked(lo);
6364         while (!list_empty(&lo->lo_owner.so_stateids)) {
6365                 stp = list_first_entry(&lo->lo_owner.so_stateids,
6366                                        struct nfs4_ol_stateid,
6367                                        st_perstateowner);
6368                 WARN_ON(!unhash_lock_stateid(stp));
6369                 put_ol_stateid_locked(stp, &reaplist);
6370         }
6371         spin_unlock(&clp->cl_lock);
6372         free_ol_stateid_reaplist(&reaplist);
6373         remove_blocked_locks(lo);
6374         nfs4_put_stateowner(&lo->lo_owner);
6375 
6376         return status;
6377 }
6378 
6379 static inline struct nfs4_client_reclaim *
6380 alloc_reclaim(void)
6381 {
6382         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
6383 }
6384 
6385 bool
6386 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
6387 {
6388         struct nfs4_client_reclaim *crp;
6389 
6390         crp = nfsd4_find_reclaim_client(name, nn);
6391         return (crp && crp->cr_clp);
6392 }
6393 
6394 /*
6395  * failure => all reset bets are off, nfserr_no_grace...
6396  */
6397 struct nfs4_client_reclaim *
6398 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
6399 {
6400         unsigned int strhashval;
6401         struct nfs4_client_reclaim *crp;
6402 
6403         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
6404         crp = alloc_reclaim();
6405         if (crp) {
6406                 strhashval = clientstr_hashval(name);
6407                 INIT_LIST_HEAD(&crp->cr_strhash);
6408                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
6409                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
6410                 crp->cr_clp = NULL;
6411                 nn->reclaim_str_hashtbl_size++;
6412         }
6413         return crp;
6414 }
6415 
6416 void
6417 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
6418 {
6419         list_del(&crp->cr_strhash);
6420         kfree(crp);
6421         nn->reclaim_str_hashtbl_size--;
6422 }
6423 
6424 void
6425 nfs4_release_reclaim(struct nfsd_net *nn)
6426 {
6427         struct nfs4_client_reclaim *crp = NULL;
6428         int i;
6429 
6430         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6431                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6432                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6433                                         struct nfs4_client_reclaim, cr_strhash);
6434                         nfs4_remove_reclaim_record(crp, nn);
6435                 }
6436         }
6437         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6438 }
6439 
6440 /*
6441  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6442 struct nfs4_client_reclaim *
6443 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
6444 {
6445         unsigned int strhashval;
6446         struct nfs4_client_reclaim *crp = NULL;
6447 
6448         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
6449 
6450         strhashval = clientstr_hashval(recdir);
6451         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6452                 if (same_name(crp->cr_recdir, recdir)) {
6453                         return crp;
6454                 }
6455         }
6456         return NULL;
6457 }
6458 
6459 /*
6460 * Called from OPEN. Look for clientid in reclaim list.
6461 */
6462 __be32
6463 nfs4_check_open_reclaim(clientid_t *clid,
6464                 struct nfsd4_compound_state *cstate,
6465                 struct nfsd_net *nn)
6466 {
6467         __be32 status;
6468 
6469         /* find clientid in conf_id_hashtbl */
6470         status = lookup_clientid(clid, cstate, nn);
6471         if (status)
6472                 return nfserr_reclaim_bad;
6473 
6474         if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6475                 return nfserr_no_grace;
6476 
6477         if (nfsd4_client_record_check(cstate->clp))
6478                 return nfserr_reclaim_bad;
6479 
6480         return nfs_ok;
6481 }
6482 
6483 #ifdef CONFIG_NFSD_FAULT_INJECTION
6484 static inline void
6485 put_client(struct nfs4_client *clp)
6486 {
6487         atomic_dec(&clp->cl_refcount);
6488 }
6489 
6490 static struct nfs4_client *
6491 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
6492 {
6493         struct nfs4_client *clp;
6494         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6495                                           nfsd_net_id);
6496 
6497         if (!nfsd_netns_ready(nn))
6498                 return NULL;
6499 
6500         list_fo