~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfs4state.c

Version: ~ [ linux-5.8-rc5 ] ~ [ linux-5.7.8 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.51 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.132 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.188 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.230 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.230 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2 *  Copyright (c) 2001 The Regents of the University of Michigan.
  3 *  All rights reserved.
  4 *
  5 *  Kendrick Smith <kmsmith@umich.edu>
  6 *  Andy Adamson <kandros@umich.edu>
  7 *
  8 *  Redistribution and use in source and binary forms, with or without
  9 *  modification, are permitted provided that the following conditions
 10 *  are met:
 11 *
 12 *  1. Redistributions of source code must retain the above copyright
 13 *     notice, this list of conditions and the following disclaimer.
 14 *  2. Redistributions in binary form must reproduce the above copyright
 15 *     notice, this list of conditions and the following disclaimer in the
 16 *     documentation and/or other materials provided with the distribution.
 17 *  3. Neither the name of the University nor the names of its
 18 *     contributors may be used to endorse or promote products derived
 19 *     from this software without specific prior written permission.
 20 *
 21 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 22 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 23 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 24 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 25 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 26 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 27 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 28 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 29 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 30 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 31 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 32 *
 33 */
 34 
 35 #include <linux/file.h>
 36 #include <linux/fs.h>
 37 #include <linux/slab.h>
 38 #include <linux/namei.h>
 39 #include <linux/swap.h>
 40 #include <linux/pagemap.h>
 41 #include <linux/ratelimit.h>
 42 #include <linux/sunrpc/svcauth_gss.h>
 43 #include <linux/sunrpc/addr.h>
 44 #include "xdr4.h"
 45 #include "xdr4cb.h"
 46 #include "vfs.h"
 47 #include "current_stateid.h"
 48 
 49 #include "netns.h"
 50 
 51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 52 
 53 #define all_ones {{~0,~0},~0}
 54 static const stateid_t one_stateid = {
 55         .si_generation = ~0,
 56         .si_opaque = all_ones,
 57 };
 58 static const stateid_t zero_stateid = {
 59         /* all fields zero */
 60 };
 61 static const stateid_t currentstateid = {
 62         .si_generation = 1,
 63 };
 64 
 65 static u64 current_sessionid = 1;
 66 
 67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
 68 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
 69 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
 70 
 71 /* forward declarations */
 72 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
 73 
 74 /* Locking: */
 75 
 76 /* Currently used for almost all code touching nfsv4 state: */
 77 static DEFINE_MUTEX(client_mutex);
 78 
 79 /*
 80  * Currently used for the del_recall_lru and file hash table.  In an
 81  * effort to decrease the scope of the client_mutex, this spinlock may
 82  * eventually cover more:
 83  */
 84 static DEFINE_SPINLOCK(recall_lock);
 85 
 86 static struct kmem_cache *openowner_slab = NULL;
 87 static struct kmem_cache *lockowner_slab = NULL;
 88 static struct kmem_cache *file_slab = NULL;
 89 static struct kmem_cache *stateid_slab = NULL;
 90 static struct kmem_cache *deleg_slab = NULL;
 91 
 92 void
 93 nfs4_lock_state(void)
 94 {
 95         mutex_lock(&client_mutex);
 96 }
 97 
 98 static void free_session(struct nfsd4_session *);
 99 
100 static bool is_session_dead(struct nfsd4_session *ses)
101 {
102         return ses->se_flags & NFS4_SESSION_DEAD;
103 }
104 
105 void nfsd4_put_session(struct nfsd4_session *ses)
106 {
107         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
108                 free_session(ses);
109 }
110 
111 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
112 {
113         if (atomic_read(&ses->se_ref) > ref_held_by_me)
114                 return nfserr_jukebox;
115         ses->se_flags |= NFS4_SESSION_DEAD;
116         return nfs_ok;
117 }
118 
119 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
120 {
121         if (is_session_dead(ses))
122                 return nfserr_badsession;
123         atomic_inc(&ses->se_ref);
124         return nfs_ok;
125 }
126 
127 void
128 nfs4_unlock_state(void)
129 {
130         mutex_unlock(&client_mutex);
131 }
132 
133 static bool is_client_expired(struct nfs4_client *clp)
134 {
135         return clp->cl_time == 0;
136 }
137 
138 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
139 {
140         if (atomic_read(&clp->cl_refcount))
141                 return nfserr_jukebox;
142         clp->cl_time = 0;
143         return nfs_ok;
144 }
145 
146 static __be32 mark_client_expired(struct nfs4_client *clp)
147 {
148         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
149         __be32 ret;
150 
151         spin_lock(&nn->client_lock);
152         ret = mark_client_expired_locked(clp);
153         spin_unlock(&nn->client_lock);
154         return ret;
155 }
156 
157 static __be32 get_client_locked(struct nfs4_client *clp)
158 {
159         if (is_client_expired(clp))
160                 return nfserr_expired;
161         atomic_inc(&clp->cl_refcount);
162         return nfs_ok;
163 }
164 
165 /* must be called under the client_lock */
166 static inline void
167 renew_client_locked(struct nfs4_client *clp)
168 {
169         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
170 
171         if (is_client_expired(clp)) {
172                 WARN_ON(1);
173                 printk("%s: client (clientid %08x/%08x) already expired\n",
174                         __func__,
175                         clp->cl_clientid.cl_boot,
176                         clp->cl_clientid.cl_id);
177                 return;
178         }
179 
180         dprintk("renewing client (clientid %08x/%08x)\n",
181                         clp->cl_clientid.cl_boot,
182                         clp->cl_clientid.cl_id);
183         list_move_tail(&clp->cl_lru, &nn->client_lru);
184         clp->cl_time = get_seconds();
185 }
186 
187 static inline void
188 renew_client(struct nfs4_client *clp)
189 {
190         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
191 
192         spin_lock(&nn->client_lock);
193         renew_client_locked(clp);
194         spin_unlock(&nn->client_lock);
195 }
196 
197 static void put_client_renew_locked(struct nfs4_client *clp)
198 {
199         if (!atomic_dec_and_test(&clp->cl_refcount))
200                 return;
201         if (!is_client_expired(clp))
202                 renew_client_locked(clp);
203 }
204 
205 void put_client_renew(struct nfs4_client *clp)
206 {
207         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
208 
209         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
210                 return;
211         if (!is_client_expired(clp))
212                 renew_client_locked(clp);
213         spin_unlock(&nn->client_lock);
214 }
215 
216 
217 static inline u32
218 opaque_hashval(const void *ptr, int nbytes)
219 {
220         unsigned char *cptr = (unsigned char *) ptr;
221 
222         u32 x = 0;
223         while (nbytes--) {
224                 x *= 37;
225                 x += *cptr++;
226         }
227         return x;
228 }
229 
230 static void nfsd4_free_file(struct nfs4_file *f)
231 {
232         kmem_cache_free(file_slab, f);
233 }
234 
235 static inline void
236 put_nfs4_file(struct nfs4_file *fi)
237 {
238         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
239                 hlist_del(&fi->fi_hash);
240                 spin_unlock(&recall_lock);
241                 iput(fi->fi_inode);
242                 nfsd4_free_file(fi);
243         }
244 }
245 
246 static inline void
247 get_nfs4_file(struct nfs4_file *fi)
248 {
249         atomic_inc(&fi->fi_ref);
250 }
251 
252 static int num_delegations;
253 unsigned long max_delegations;
254 
255 /*
256  * Open owner state (share locks)
257  */
258 
259 /* hash tables for lock and open owners */
260 #define OWNER_HASH_BITS              8
261 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
262 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
263 
264 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
265 {
266         unsigned int ret;
267 
268         ret = opaque_hashval(ownername->data, ownername->len);
269         ret += clientid;
270         return ret & OWNER_HASH_MASK;
271 }
272 
273 /* hash table for nfs4_file */
274 #define FILE_HASH_BITS                   8
275 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
276 
277 static unsigned int file_hashval(struct inode *ino)
278 {
279         /* XXX: why are we hashing on inode pointer, anyway? */
280         return hash_ptr(ino, FILE_HASH_BITS);
281 }
282 
283 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
284 
285 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
286 {
287         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
288         atomic_inc(&fp->fi_access[oflag]);
289 }
290 
291 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
292 {
293         if (oflag == O_RDWR) {
294                 __nfs4_file_get_access(fp, O_RDONLY);
295                 __nfs4_file_get_access(fp, O_WRONLY);
296         } else
297                 __nfs4_file_get_access(fp, oflag);
298 }
299 
300 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
301 {
302         if (fp->fi_fds[oflag]) {
303                 fput(fp->fi_fds[oflag]);
304                 fp->fi_fds[oflag] = NULL;
305         }
306 }
307 
308 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
309 {
310         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
311                 nfs4_file_put_fd(fp, oflag);
312                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
313                         nfs4_file_put_fd(fp, O_RDWR);
314         }
315 }
316 
317 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
318 {
319         if (oflag == O_RDWR) {
320                 __nfs4_file_put_access(fp, O_RDONLY);
321                 __nfs4_file_put_access(fp, O_WRONLY);
322         } else
323                 __nfs4_file_put_access(fp, oflag);
324 }
325 
326 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
327 kmem_cache *slab)
328 {
329         struct idr *stateids = &cl->cl_stateids;
330         struct nfs4_stid *stid;
331         int new_id;
332 
333         stid = kmem_cache_alloc(slab, GFP_KERNEL);
334         if (!stid)
335                 return NULL;
336 
337         new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
338         if (new_id < 0)
339                 goto out_free;
340         stid->sc_client = cl;
341         stid->sc_type = 0;
342         stid->sc_stateid.si_opaque.so_id = new_id;
343         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
344         /* Will be incremented before return to client: */
345         stid->sc_stateid.si_generation = 0;
346 
347         /*
348          * It shouldn't be a problem to reuse an opaque stateid value.
349          * I don't think it is for 4.1.  But with 4.0 I worry that, for
350          * example, a stray write retransmission could be accepted by
351          * the server when it should have been rejected.  Therefore,
352          * adopt a trick from the sctp code to attempt to maximize the
353          * amount of time until an id is reused, by ensuring they always
354          * "increase" (mod INT_MAX):
355          */
356         return stid;
357 out_free:
358         kmem_cache_free(slab, stid);
359         return NULL;
360 }
361 
362 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
363 {
364         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
365 }
366 
367 static struct nfs4_delegation *
368 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
369 {
370         struct nfs4_delegation *dp;
371 
372         dprintk("NFSD alloc_init_deleg\n");
373         if (num_delegations > max_delegations)
374                 return NULL;
375         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
376         if (dp == NULL)
377                 return dp;
378         dp->dl_stid.sc_type = NFS4_DELEG_STID;
379         /*
380          * delegation seqid's are never incremented.  The 4.1 special
381          * meaning of seqid 0 isn't meaningful, really, but let's avoid
382          * 0 anyway just for consistency and use 1:
383          */
384         dp->dl_stid.sc_stateid.si_generation = 1;
385         num_delegations++;
386         INIT_LIST_HEAD(&dp->dl_perfile);
387         INIT_LIST_HEAD(&dp->dl_perclnt);
388         INIT_LIST_HEAD(&dp->dl_recall_lru);
389         dp->dl_file = NULL;
390         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
391         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
392         dp->dl_time = 0;
393         atomic_set(&dp->dl_count, 1);
394         nfsd4_init_callback(&dp->dl_recall);
395         return dp;
396 }
397 
398 static void remove_stid(struct nfs4_stid *s)
399 {
400         struct idr *stateids = &s->sc_client->cl_stateids;
401 
402         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
403 }
404 
405 static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
406 {
407         kmem_cache_free(slab, s);
408 }
409 
410 void
411 nfs4_put_delegation(struct nfs4_delegation *dp)
412 {
413         if (atomic_dec_and_test(&dp->dl_count)) {
414                 nfs4_free_stid(deleg_slab, &dp->dl_stid);
415                 num_delegations--;
416         }
417 }
418 
419 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
420 {
421         if (atomic_dec_and_test(&fp->fi_delegees)) {
422                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
423                 fp->fi_lease = NULL;
424                 fput(fp->fi_deleg_file);
425                 fp->fi_deleg_file = NULL;
426         }
427 }
428 
429 static void unhash_stid(struct nfs4_stid *s)
430 {
431         s->sc_type = 0;
432 }
433 
434 /* Called under the state lock. */
435 static void
436 unhash_delegation(struct nfs4_delegation *dp)
437 {
438         list_del_init(&dp->dl_perclnt);
439         spin_lock(&recall_lock);
440         list_del_init(&dp->dl_perfile);
441         list_del_init(&dp->dl_recall_lru);
442         spin_unlock(&recall_lock);
443         nfs4_put_deleg_lease(dp->dl_file);
444         put_nfs4_file(dp->dl_file);
445         dp->dl_file = NULL;
446 }
447 
448 
449 
450 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
451 {
452         list_del_init(&dp->dl_recall_lru);
453         remove_stid(&dp->dl_stid);
454         nfs4_put_delegation(dp);
455 }
456 
457 static void destroy_delegation(struct nfs4_delegation *dp)
458 {
459         unhash_delegation(dp);
460         remove_stid(&dp->dl_stid);
461         nfs4_put_delegation(dp);
462 }
463 
464 static void revoke_delegation(struct nfs4_delegation *dp)
465 {
466         struct nfs4_client *clp = dp->dl_stid.sc_client;
467 
468         if (clp->cl_minorversion == 0)
469                 destroy_delegation(dp);
470         else {
471                 unhash_delegation(dp);
472                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
473                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
474         }
475 }
476 
477 /* 
478  * SETCLIENTID state 
479  */
480 
481 static unsigned int clientid_hashval(u32 id)
482 {
483         return id & CLIENT_HASH_MASK;
484 }
485 
486 static unsigned int clientstr_hashval(const char *name)
487 {
488         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
489 }
490 
491 /*
492  * We store the NONE, READ, WRITE, and BOTH bits separately in the
493  * st_{access,deny}_bmap field of the stateid, in order to track not
494  * only what share bits are currently in force, but also what
495  * combinations of share bits previous opens have used.  This allows us
496  * to enforce the recommendation of rfc 3530 14.2.19 that the server
497  * return an error if the client attempt to downgrade to a combination
498  * of share bits not explicable by closing some of its previous opens.
499  *
500  * XXX: This enforcement is actually incomplete, since we don't keep
501  * track of access/deny bit combinations; so, e.g., we allow:
502  *
503  *      OPEN allow read, deny write
504  *      OPEN allow both, deny none
505  *      DOWNGRADE allow read, deny none
506  *
507  * which we should reject.
508  */
509 static unsigned int
510 bmap_to_share_mode(unsigned long bmap) {
511         int i;
512         unsigned int access = 0;
513 
514         for (i = 1; i < 4; i++) {
515                 if (test_bit(i, &bmap))
516                         access |= i;
517         }
518         return access;
519 }
520 
521 static bool
522 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
523         unsigned int access, deny;
524 
525         access = bmap_to_share_mode(stp->st_access_bmap);
526         deny = bmap_to_share_mode(stp->st_deny_bmap);
527         if ((access & open->op_share_deny) || (deny & open->op_share_access))
528                 return false;
529         return true;
530 }
531 
532 /* set share access for a given stateid */
533 static inline void
534 set_access(u32 access, struct nfs4_ol_stateid *stp)
535 {
536         __set_bit(access, &stp->st_access_bmap);
537 }
538 
539 /* clear share access for a given stateid */
540 static inline void
541 clear_access(u32 access, struct nfs4_ol_stateid *stp)
542 {
543         __clear_bit(access, &stp->st_access_bmap);
544 }
545 
546 /* test whether a given stateid has access */
547 static inline bool
548 test_access(u32 access, struct nfs4_ol_stateid *stp)
549 {
550         return test_bit(access, &stp->st_access_bmap);
551 }
552 
553 /* set share deny for a given stateid */
554 static inline void
555 set_deny(u32 access, struct nfs4_ol_stateid *stp)
556 {
557         __set_bit(access, &stp->st_deny_bmap);
558 }
559 
560 /* clear share deny for a given stateid */
561 static inline void
562 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
563 {
564         __clear_bit(access, &stp->st_deny_bmap);
565 }
566 
567 /* test whether a given stateid is denying specific access */
568 static inline bool
569 test_deny(u32 access, struct nfs4_ol_stateid *stp)
570 {
571         return test_bit(access, &stp->st_deny_bmap);
572 }
573 
574 static int nfs4_access_to_omode(u32 access)
575 {
576         switch (access & NFS4_SHARE_ACCESS_BOTH) {
577         case NFS4_SHARE_ACCESS_READ:
578                 return O_RDONLY;
579         case NFS4_SHARE_ACCESS_WRITE:
580                 return O_WRONLY;
581         case NFS4_SHARE_ACCESS_BOTH:
582                 return O_RDWR;
583         }
584         WARN_ON_ONCE(1);
585         return O_RDONLY;
586 }
587 
588 /* release all access and file references for a given stateid */
589 static void
590 release_all_access(struct nfs4_ol_stateid *stp)
591 {
592         int i;
593 
594         for (i = 1; i < 4; i++) {
595                 if (test_access(i, stp))
596                         nfs4_file_put_access(stp->st_file,
597                                              nfs4_access_to_omode(i));
598                 clear_access(i, stp);
599         }
600 }
601 
602 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
603 {
604         list_del(&stp->st_perfile);
605         list_del(&stp->st_perstateowner);
606 }
607 
608 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
609 {
610         release_all_access(stp);
611         put_nfs4_file(stp->st_file);
612         stp->st_file = NULL;
613 }
614 
615 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
616 {
617         remove_stid(&stp->st_stid);
618         nfs4_free_stid(stateid_slab, &stp->st_stid);
619 }
620 
621 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
622 {
623         struct file *file;
624 
625         unhash_generic_stateid(stp);
626         unhash_stid(&stp->st_stid);
627         file = find_any_file(stp->st_file);
628         if (file)
629                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
630         close_generic_stateid(stp);
631         free_generic_stateid(stp);
632 }
633 
634 static void unhash_lockowner(struct nfs4_lockowner *lo)
635 {
636         struct nfs4_ol_stateid *stp;
637 
638         list_del(&lo->lo_owner.so_strhash);
639         list_del(&lo->lo_perstateid);
640         list_del(&lo->lo_owner_ino_hash);
641         while (!list_empty(&lo->lo_owner.so_stateids)) {
642                 stp = list_first_entry(&lo->lo_owner.so_stateids,
643                                 struct nfs4_ol_stateid, st_perstateowner);
644                 release_lock_stateid(stp);
645         }
646 }
647 
648 static void release_lockowner(struct nfs4_lockowner *lo)
649 {
650         unhash_lockowner(lo);
651         nfs4_free_lockowner(lo);
652 }
653 
654 static void
655 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
656 {
657         struct nfs4_lockowner *lo;
658 
659         while (!list_empty(&open_stp->st_lockowners)) {
660                 lo = list_entry(open_stp->st_lockowners.next,
661                                 struct nfs4_lockowner, lo_perstateid);
662                 release_lockowner(lo);
663         }
664 }
665 
666 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
667 {
668         unhash_generic_stateid(stp);
669         release_stateid_lockowners(stp);
670         close_generic_stateid(stp);
671 }
672 
673 static void release_open_stateid(struct nfs4_ol_stateid *stp)
674 {
675         unhash_open_stateid(stp);
676         free_generic_stateid(stp);
677 }
678 
679 static void unhash_openowner(struct nfs4_openowner *oo)
680 {
681         struct nfs4_ol_stateid *stp;
682 
683         list_del(&oo->oo_owner.so_strhash);
684         list_del(&oo->oo_perclient);
685         while (!list_empty(&oo->oo_owner.so_stateids)) {
686                 stp = list_first_entry(&oo->oo_owner.so_stateids,
687                                 struct nfs4_ol_stateid, st_perstateowner);
688                 release_open_stateid(stp);
689         }
690 }
691 
692 static void release_last_closed_stateid(struct nfs4_openowner *oo)
693 {
694         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
695 
696         if (s) {
697                 free_generic_stateid(s);
698                 oo->oo_last_closed_stid = NULL;
699         }
700 }
701 
702 static void release_openowner(struct nfs4_openowner *oo)
703 {
704         unhash_openowner(oo);
705         list_del(&oo->oo_close_lru);
706         release_last_closed_stateid(oo);
707         nfs4_free_openowner(oo);
708 }
709 
710 static inline int
711 hash_sessionid(struct nfs4_sessionid *sessionid)
712 {
713         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
714 
715         return sid->sequence % SESSION_HASH_SIZE;
716 }
717 
718 #ifdef NFSD_DEBUG
719 static inline void
720 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
721 {
722         u32 *ptr = (u32 *)(&sessionid->data[0]);
723         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
724 }
725 #else
726 static inline void
727 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
728 {
729 }
730 #endif
731 
732 /*
733  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
734  * won't be used for replay.
735  */
736 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
737 {
738         struct nfs4_stateowner *so = cstate->replay_owner;
739 
740         if (nfserr == nfserr_replay_me)
741                 return;
742 
743         if (!seqid_mutating_err(ntohl(nfserr))) {
744                 cstate->replay_owner = NULL;
745                 return;
746         }
747         if (!so)
748                 return;
749         if (so->so_is_open_owner)
750                 release_last_closed_stateid(openowner(so));
751         so->so_seqid++;
752         return;
753 }
754 
755 static void
756 gen_sessionid(struct nfsd4_session *ses)
757 {
758         struct nfs4_client *clp = ses->se_client;
759         struct nfsd4_sessionid *sid;
760 
761         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
762         sid->clientid = clp->cl_clientid;
763         sid->sequence = current_sessionid++;
764         sid->reserved = 0;
765 }
766 
767 /*
768  * The protocol defines ca_maxresponssize_cached to include the size of
769  * the rpc header, but all we need to cache is the data starting after
770  * the end of the initial SEQUENCE operation--the rest we regenerate
771  * each time.  Therefore we can advertise a ca_maxresponssize_cached
772  * value that is the number of bytes in our cache plus a few additional
773  * bytes.  In order to stay on the safe side, and not promise more than
774  * we can cache, those additional bytes must be the minimum possible: 24
775  * bytes of rpc header (xid through accept state, with AUTH_NULL
776  * verifier), 12 for the compound header (with zero-length tag), and 44
777  * for the SEQUENCE op response:
778  */
779 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
780 
781 static void
782 free_session_slots(struct nfsd4_session *ses)
783 {
784         int i;
785 
786         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
787                 kfree(ses->se_slots[i]);
788 }
789 
790 /*
791  * We don't actually need to cache the rpc and session headers, so we
792  * can allocate a little less for each slot:
793  */
794 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
795 {
796         u32 size;
797 
798         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
799                 size = 0;
800         else
801                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
802         return size + sizeof(struct nfsd4_slot);
803 }
804 
805 /*
806  * XXX: If we run out of reserved DRC memory we could (up to a point)
807  * re-negotiate active sessions and reduce their slot usage to make
808  * room for new connections. For now we just fail the create session.
809  */
810 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
811 {
812         u32 slotsize = slot_bytes(ca);
813         u32 num = ca->maxreqs;
814         int avail;
815 
816         spin_lock(&nfsd_drc_lock);
817         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
818                     nfsd_drc_max_mem - nfsd_drc_mem_used);
819         num = min_t(int, num, avail / slotsize);
820         nfsd_drc_mem_used += num * slotsize;
821         spin_unlock(&nfsd_drc_lock);
822 
823         return num;
824 }
825 
826 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
827 {
828         int slotsize = slot_bytes(ca);
829 
830         spin_lock(&nfsd_drc_lock);
831         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
832         spin_unlock(&nfsd_drc_lock);
833 }
834 
835 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
836                                            struct nfsd4_channel_attrs *battrs)
837 {
838         int numslots = fattrs->maxreqs;
839         int slotsize = slot_bytes(fattrs);
840         struct nfsd4_session *new;
841         int mem, i;
842 
843         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
844                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
845         mem = numslots * sizeof(struct nfsd4_slot *);
846 
847         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
848         if (!new)
849                 return NULL;
850         /* allocate each struct nfsd4_slot and data cache in one piece */
851         for (i = 0; i < numslots; i++) {
852                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
853                 if (!new->se_slots[i])
854                         goto out_free;
855         }
856 
857         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
858         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
859 
860         return new;
861 out_free:
862         while (i--)
863                 kfree(new->se_slots[i]);
864         kfree(new);
865         return NULL;
866 }
867 
868 static void free_conn(struct nfsd4_conn *c)
869 {
870         svc_xprt_put(c->cn_xprt);
871         kfree(c);
872 }
873 
874 static void nfsd4_conn_lost(struct svc_xpt_user *u)
875 {
876         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
877         struct nfs4_client *clp = c->cn_session->se_client;
878 
879         spin_lock(&clp->cl_lock);
880         if (!list_empty(&c->cn_persession)) {
881                 list_del(&c->cn_persession);
882                 free_conn(c);
883         }
884         nfsd4_probe_callback(clp);
885         spin_unlock(&clp->cl_lock);
886 }
887 
888 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
889 {
890         struct nfsd4_conn *conn;
891 
892         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
893         if (!conn)
894                 return NULL;
895         svc_xprt_get(rqstp->rq_xprt);
896         conn->cn_xprt = rqstp->rq_xprt;
897         conn->cn_flags = flags;
898         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
899         return conn;
900 }
901 
902 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
903 {
904         conn->cn_session = ses;
905         list_add(&conn->cn_persession, &ses->se_conns);
906 }
907 
908 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
909 {
910         struct nfs4_client *clp = ses->se_client;
911 
912         spin_lock(&clp->cl_lock);
913         __nfsd4_hash_conn(conn, ses);
914         spin_unlock(&clp->cl_lock);
915 }
916 
917 static int nfsd4_register_conn(struct nfsd4_conn *conn)
918 {
919         conn->cn_xpt_user.callback = nfsd4_conn_lost;
920         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
921 }
922 
923 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
924 {
925         int ret;
926 
927         nfsd4_hash_conn(conn, ses);
928         ret = nfsd4_register_conn(conn);
929         if (ret)
930                 /* oops; xprt is already down: */
931                 nfsd4_conn_lost(&conn->cn_xpt_user);
932         if (conn->cn_flags & NFS4_CDFC4_BACK) {
933                 /* callback channel may be back up */
934                 nfsd4_probe_callback(ses->se_client);
935         }
936 }
937 
938 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
939 {
940         u32 dir = NFS4_CDFC4_FORE;
941 
942         if (cses->flags & SESSION4_BACK_CHAN)
943                 dir |= NFS4_CDFC4_BACK;
944         return alloc_conn(rqstp, dir);
945 }
946 
947 /* must be called under client_lock */
948 static void nfsd4_del_conns(struct nfsd4_session *s)
949 {
950         struct nfs4_client *clp = s->se_client;
951         struct nfsd4_conn *c;
952 
953         spin_lock(&clp->cl_lock);
954         while (!list_empty(&s->se_conns)) {
955                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
956                 list_del_init(&c->cn_persession);
957                 spin_unlock(&clp->cl_lock);
958 
959                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
960                 free_conn(c);
961 
962                 spin_lock(&clp->cl_lock);
963         }
964         spin_unlock(&clp->cl_lock);
965 }
966 
967 static void __free_session(struct nfsd4_session *ses)
968 {
969         free_session_slots(ses);
970         kfree(ses);
971 }
972 
973 static void free_session(struct nfsd4_session *ses)
974 {
975         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
976 
977         lockdep_assert_held(&nn->client_lock);
978         nfsd4_del_conns(ses);
979         nfsd4_put_drc_mem(&ses->se_fchannel);
980         __free_session(ses);
981 }
982 
983 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
984 {
985         int idx;
986         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
987 
988         new->se_client = clp;
989         gen_sessionid(new);
990 
991         INIT_LIST_HEAD(&new->se_conns);
992 
993         new->se_cb_seq_nr = 1;
994         new->se_flags = cses->flags;
995         new->se_cb_prog = cses->callback_prog;
996         new->se_cb_sec = cses->cb_sec;
997         atomic_set(&new->se_ref, 0);
998         idx = hash_sessionid(&new->se_sessionid);
999         spin_lock(&nn->client_lock);
1000         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1001         spin_lock(&clp->cl_lock);
1002         list_add(&new->se_perclnt, &clp->cl_sessions);
1003         spin_unlock(&clp->cl_lock);
1004         spin_unlock(&nn->client_lock);
1005 
1006         if (cses->flags & SESSION4_BACK_CHAN) {
1007                 struct sockaddr *sa = svc_addr(rqstp);
1008                 /*
1009                  * This is a little silly; with sessions there's no real
1010                  * use for the callback address.  Use the peer address
1011                  * as a reasonable default for now, but consider fixing
1012                  * the rpc client not to require an address in the
1013                  * future:
1014                  */
1015                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1016                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1017         }
1018 }
1019 
1020 /* caller must hold client_lock */
1021 static struct nfsd4_session *
1022 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1023 {
1024         struct nfsd4_session *elem;
1025         int idx;
1026         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1027 
1028         dump_sessionid(__func__, sessionid);
1029         idx = hash_sessionid(sessionid);
1030         /* Search in the appropriate list */
1031         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1032                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1033                             NFS4_MAX_SESSIONID_LEN)) {
1034                         return elem;
1035                 }
1036         }
1037 
1038         dprintk("%s: session not found\n", __func__);
1039         return NULL;
1040 }
1041 
1042 /* caller must hold client_lock */
1043 static void
1044 unhash_session(struct nfsd4_session *ses)
1045 {
1046         list_del(&ses->se_hash);
1047         spin_lock(&ses->se_client->cl_lock);
1048         list_del(&ses->se_perclnt);
1049         spin_unlock(&ses->se_client->cl_lock);
1050 }
1051 
1052 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1053 static int
1054 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1055 {
1056         if (clid->cl_boot == nn->boot_time)
1057                 return 0;
1058         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1059                 clid->cl_boot, clid->cl_id, nn->boot_time);
1060         return 1;
1061 }
1062 
1063 /* 
1064  * XXX Should we use a slab cache ?
1065  * This type of memory management is somewhat inefficient, but we use it
1066  * anyway since SETCLIENTID is not a common operation.
1067  */
1068 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1069 {
1070         struct nfs4_client *clp;
1071 
1072         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1073         if (clp == NULL)
1074                 return NULL;
1075         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1076         if (clp->cl_name.data == NULL) {
1077                 kfree(clp);
1078                 return NULL;
1079         }
1080         clp->cl_name.len = name.len;
1081         INIT_LIST_HEAD(&clp->cl_sessions);
1082         idr_init(&clp->cl_stateids);
1083         atomic_set(&clp->cl_refcount, 0);
1084         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1085         INIT_LIST_HEAD(&clp->cl_idhash);
1086         INIT_LIST_HEAD(&clp->cl_openowners);
1087         INIT_LIST_HEAD(&clp->cl_delegations);
1088         INIT_LIST_HEAD(&clp->cl_lru);
1089         INIT_LIST_HEAD(&clp->cl_callbacks);
1090         INIT_LIST_HEAD(&clp->cl_revoked);
1091         spin_lock_init(&clp->cl_lock);
1092         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1093         return clp;
1094 }
1095 
1096 static inline void
1097 free_client(struct nfs4_client *clp)
1098 {
1099         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1100 
1101         lockdep_assert_held(&nn->client_lock);
1102         while (!list_empty(&clp->cl_sessions)) {
1103                 struct nfsd4_session *ses;
1104                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1105                                 se_perclnt);
1106                 list_del(&ses->se_perclnt);
1107                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1108                 free_session(ses);
1109         }
1110         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1111         free_svc_cred(&clp->cl_cred);
1112         kfree(clp->cl_name.data);
1113         idr_destroy(&clp->cl_stateids);
1114         kfree(clp);
1115 }
1116 
1117 /* must be called under the client_lock */
1118 static inline void
1119 unhash_client_locked(struct nfs4_client *clp)
1120 {
1121         struct nfsd4_session *ses;
1122 
1123         list_del(&clp->cl_lru);
1124         spin_lock(&clp->cl_lock);
1125         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1126                 list_del_init(&ses->se_hash);
1127         spin_unlock(&clp->cl_lock);
1128 }
1129 
1130 static void
1131 destroy_client(struct nfs4_client *clp)
1132 {
1133         struct nfs4_openowner *oo;
1134         struct nfs4_delegation *dp;
1135         struct list_head reaplist;
1136         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1137 
1138         INIT_LIST_HEAD(&reaplist);
1139         spin_lock(&recall_lock);
1140         while (!list_empty(&clp->cl_delegations)) {
1141                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1142                 list_del_init(&dp->dl_perclnt);
1143                 list_move(&dp->dl_recall_lru, &reaplist);
1144         }
1145         spin_unlock(&recall_lock);
1146         while (!list_empty(&reaplist)) {
1147                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1148                 destroy_delegation(dp);
1149         }
1150         list_splice_init(&clp->cl_revoked, &reaplist);
1151         while (!list_empty(&reaplist)) {
1152                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1153                 destroy_revoked_delegation(dp);
1154         }
1155         while (!list_empty(&clp->cl_openowners)) {
1156                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1157                 release_openowner(oo);
1158         }
1159         nfsd4_shutdown_callback(clp);
1160         if (clp->cl_cb_conn.cb_xprt)
1161                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1162         list_del(&clp->cl_idhash);
1163         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1164                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1165         else
1166                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1167         spin_lock(&nn->client_lock);
1168         unhash_client_locked(clp);
1169         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1170         free_client(clp);
1171         spin_unlock(&nn->client_lock);
1172 }
1173 
1174 static void expire_client(struct nfs4_client *clp)
1175 {
1176         nfsd4_client_record_remove(clp);
1177         destroy_client(clp);
1178 }
1179 
1180 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1181 {
1182         memcpy(target->cl_verifier.data, source->data,
1183                         sizeof(target->cl_verifier.data));
1184 }
1185 
1186 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1187 {
1188         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
1189         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
1190 }
1191 
1192 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1193 {
1194         if (source->cr_principal) {
1195                 target->cr_principal =
1196                                 kstrdup(source->cr_principal, GFP_KERNEL);
1197                 if (target->cr_principal == NULL)
1198                         return -ENOMEM;
1199         } else
1200                 target->cr_principal = NULL;
1201         target->cr_flavor = source->cr_flavor;
1202         target->cr_uid = source->cr_uid;
1203         target->cr_gid = source->cr_gid;
1204         target->cr_group_info = source->cr_group_info;
1205         get_group_info(target->cr_group_info);
1206         target->cr_gss_mech = source->cr_gss_mech;
1207         if (source->cr_gss_mech)
1208                 gss_mech_get(source->cr_gss_mech);
1209         return 0;
1210 }
1211 
1212 static int
1213 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1214 {
1215         if (o1->len < o2->len)
1216                 return -1;
1217         if (o1->len > o2->len)
1218                 return 1;
1219         return memcmp(o1->data, o2->data, o1->len);
1220 }
1221 
1222 static int same_name(const char *n1, const char *n2)
1223 {
1224         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1225 }
1226 
1227 static int
1228 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1229 {
1230         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1231 }
1232 
1233 static int
1234 same_clid(clientid_t *cl1, clientid_t *cl2)
1235 {
1236         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1237 }
1238 
1239 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1240 {
1241         int i;
1242 
1243         if (g1->ngroups != g2->ngroups)
1244                 return false;
1245         for (i=0; i<g1->ngroups; i++)
1246                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1247                         return false;
1248         return true;
1249 }
1250 
1251 /*
1252  * RFC 3530 language requires clid_inuse be returned when the
1253  * "principal" associated with a requests differs from that previously
1254  * used.  We use uid, gid's, and gss principal string as our best
1255  * approximation.  We also don't want to allow non-gss use of a client
1256  * established using gss: in theory cr_principal should catch that
1257  * change, but in practice cr_principal can be null even in the gss case
1258  * since gssd doesn't always pass down a principal string.
1259  */
1260 static bool is_gss_cred(struct svc_cred *cr)
1261 {
1262         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1263         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1264 }
1265 
1266 
1267 static bool
1268 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1269 {
1270         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1271                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1272                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1273                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1274                 return false;
1275         if (cr1->cr_principal == cr2->cr_principal)
1276                 return true;
1277         if (!cr1->cr_principal || !cr2->cr_principal)
1278                 return false;
1279         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1280 }
1281 
1282 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1283 {
1284         struct svc_cred *cr = &rqstp->rq_cred;
1285         u32 service;
1286 
1287         if (!cr->cr_gss_mech)
1288                 return false;
1289         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1290         return service == RPC_GSS_SVC_INTEGRITY ||
1291                service == RPC_GSS_SVC_PRIVACY;
1292 }
1293 
1294 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1295 {
1296         struct svc_cred *cr = &rqstp->rq_cred;
1297 
1298         if (!cl->cl_mach_cred)
1299                 return true;
1300         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1301                 return false;
1302         if (!svc_rqst_integrity_protected(rqstp))
1303                 return false;
1304         if (!cr->cr_principal)
1305                 return false;
1306         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1307 }
1308 
1309 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1310 {
1311         static u32 current_clientid = 1;
1312 
1313         clp->cl_clientid.cl_boot = nn->boot_time;
1314         clp->cl_clientid.cl_id = current_clientid++; 
1315 }
1316 
1317 static void gen_confirm(struct nfs4_client *clp)
1318 {
1319         __be32 verf[2];
1320         static u32 i;
1321 
1322         verf[0] = (__be32)get_seconds();
1323         verf[1] = (__be32)i++;
1324         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1325 }
1326 
1327 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1328 {
1329         struct nfs4_stid *ret;
1330 
1331         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1332         if (!ret || !ret->sc_type)
1333                 return NULL;
1334         return ret;
1335 }
1336 
1337 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1338 {
1339         struct nfs4_stid *s;
1340 
1341         s = find_stateid(cl, t);
1342         if (!s)
1343                 return NULL;
1344         if (typemask & s->sc_type)
1345                 return s;
1346         return NULL;
1347 }
1348 
1349 static struct nfs4_client *create_client(struct xdr_netobj name,
1350                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1351 {
1352         struct nfs4_client *clp;
1353         struct sockaddr *sa = svc_addr(rqstp);
1354         int ret;
1355         struct net *net = SVC_NET(rqstp);
1356         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1357 
1358         clp = alloc_client(name);
1359         if (clp == NULL)
1360                 return NULL;
1361 
1362         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1363         if (ret) {
1364                 spin_lock(&nn->client_lock);
1365                 free_client(clp);
1366                 spin_unlock(&nn->client_lock);
1367                 return NULL;
1368         }
1369         nfsd4_init_callback(&clp->cl_cb_null);
1370         clp->cl_time = get_seconds();
1371         clear_bit(0, &clp->cl_cb_slot_busy);
1372         copy_verf(clp, verf);
1373         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1374         gen_confirm(clp);
1375         clp->cl_cb_session = NULL;
1376         clp->net = net;
1377         return clp;
1378 }
1379 
1380 static void
1381 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1382 {
1383         struct rb_node **new = &(root->rb_node), *parent = NULL;
1384         struct nfs4_client *clp;
1385 
1386         while (*new) {
1387                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1388                 parent = *new;
1389 
1390                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1391                         new = &((*new)->rb_left);
1392                 else
1393                         new = &((*new)->rb_right);
1394         }
1395 
1396         rb_link_node(&new_clp->cl_namenode, parent, new);
1397         rb_insert_color(&new_clp->cl_namenode, root);
1398 }
1399 
1400 static struct nfs4_client *
1401 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1402 {
1403         int cmp;
1404         struct rb_node *node = root->rb_node;
1405         struct nfs4_client *clp;
1406 
1407         while (node) {
1408                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1409                 cmp = compare_blob(&clp->cl_name, name);
1410                 if (cmp > 0)
1411                         node = node->rb_left;
1412                 else if (cmp < 0)
1413                         node = node->rb_right;
1414                 else
1415                         return clp;
1416         }
1417         return NULL;
1418 }
1419 
1420 static void
1421 add_to_unconfirmed(struct nfs4_client *clp)
1422 {
1423         unsigned int idhashval;
1424         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1425 
1426         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1427         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1428         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1429         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1430         renew_client(clp);
1431 }
1432 
1433 static void
1434 move_to_confirmed(struct nfs4_client *clp)
1435 {
1436         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1437         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1438 
1439         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1440         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1441         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1442         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1443         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1444         renew_client(clp);
1445 }
1446 
1447 static struct nfs4_client *
1448 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1449 {
1450         struct nfs4_client *clp;
1451         unsigned int idhashval = clientid_hashval(clid->cl_id);
1452 
1453         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1454                 if (same_clid(&clp->cl_clientid, clid)) {
1455                         if ((bool)clp->cl_minorversion != sessions)
1456                                 return NULL;
1457                         renew_client(clp);
1458                         return clp;
1459                 }
1460         }
1461         return NULL;
1462 }
1463 
1464 static struct nfs4_client *
1465 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1466 {
1467         struct list_head *tbl = nn->conf_id_hashtbl;
1468 
1469         return find_client_in_id_table(tbl, clid, sessions);
1470 }
1471 
1472 static struct nfs4_client *
1473 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1474 {
1475         struct list_head *tbl = nn->unconf_id_hashtbl;
1476 
1477         return find_client_in_id_table(tbl, clid, sessions);
1478 }
1479 
1480 static bool clp_used_exchangeid(struct nfs4_client *clp)
1481 {
1482         return clp->cl_exchange_flags != 0;
1483 } 
1484 
1485 static struct nfs4_client *
1486 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1487 {
1488         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1489 }
1490 
1491 static struct nfs4_client *
1492 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1493 {
1494         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1495 }
1496 
1497 static void
1498 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1499 {
1500         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1501         struct sockaddr *sa = svc_addr(rqstp);
1502         u32 scopeid = rpc_get_scope_id(sa);
1503         unsigned short expected_family;
1504 
1505         /* Currently, we only support tcp and tcp6 for the callback channel */
1506         if (se->se_callback_netid_len == 3 &&
1507             !memcmp(se->se_callback_netid_val, "tcp", 3))
1508                 expected_family = AF_INET;
1509         else if (se->se_callback_netid_len == 4 &&
1510                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1511                 expected_family = AF_INET6;
1512         else
1513                 goto out_err;
1514 
1515         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1516                                             se->se_callback_addr_len,
1517                                             (struct sockaddr *)&conn->cb_addr,
1518                                             sizeof(conn->cb_addr));
1519 
1520         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1521                 goto out_err;
1522 
1523         if (conn->cb_addr.ss_family == AF_INET6)
1524                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1525 
1526         conn->cb_prog = se->se_callback_prog;
1527         conn->cb_ident = se->se_callback_ident;
1528         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1529         return;
1530 out_err:
1531         conn->cb_addr.ss_family = AF_UNSPEC;
1532         conn->cb_addrlen = 0;
1533         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1534                 "will not receive delegations\n",
1535                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1536 
1537         return;
1538 }
1539 
1540 /*
1541  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1542  */
1543 void
1544 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1545 {
1546         struct nfsd4_slot *slot = resp->cstate.slot;
1547         unsigned int base;
1548 
1549         dprintk("--> %s slot %p\n", __func__, slot);
1550 
1551         slot->sl_opcnt = resp->opcnt;
1552         slot->sl_status = resp->cstate.status;
1553 
1554         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1555         if (nfsd4_not_cached(resp)) {
1556                 slot->sl_datalen = 0;
1557                 return;
1558         }
1559         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1560         base = (char *)resp->cstate.datap -
1561                                         (char *)resp->xbuf->head[0].iov_base;
1562         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1563                                     slot->sl_datalen))
1564                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1565         return;
1566 }
1567 
1568 /*
1569  * Encode the replay sequence operation from the slot values.
1570  * If cachethis is FALSE encode the uncached rep error on the next
1571  * operation which sets resp->p and increments resp->opcnt for
1572  * nfs4svc_encode_compoundres.
1573  *
1574  */
1575 static __be32
1576 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1577                           struct nfsd4_compoundres *resp)
1578 {
1579         struct nfsd4_op *op;
1580         struct nfsd4_slot *slot = resp->cstate.slot;
1581 
1582         /* Encode the replayed sequence operation */
1583         op = &args->ops[resp->opcnt - 1];
1584         nfsd4_encode_operation(resp, op);
1585 
1586         /* Return nfserr_retry_uncached_rep in next operation. */
1587         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1588                 op = &args->ops[resp->opcnt++];
1589                 op->status = nfserr_retry_uncached_rep;
1590                 nfsd4_encode_operation(resp, op);
1591         }
1592         return op->status;
1593 }
1594 
1595 /*
1596  * The sequence operation is not cached because we can use the slot and
1597  * session values.
1598  */
1599 __be32
1600 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1601                          struct nfsd4_sequence *seq)
1602 {
1603         struct nfsd4_slot *slot = resp->cstate.slot;
1604         __be32 status;
1605 
1606         dprintk("--> %s slot %p\n", __func__, slot);
1607 
1608         /* Either returns 0 or nfserr_retry_uncached */
1609         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1610         if (status == nfserr_retry_uncached_rep)
1611                 return status;
1612 
1613         /* The sequence operation has been encoded, cstate->datap set. */
1614         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1615 
1616         resp->opcnt = slot->sl_opcnt;
1617         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1618         status = slot->sl_status;
1619 
1620         return status;
1621 }
1622 
1623 /*
1624  * Set the exchange_id flags returned by the server.
1625  */
1626 static void
1627 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1628 {
1629         /* pNFS is not supported */
1630         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1631 
1632         /* Referrals are supported, Migration is not. */
1633         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1634 
1635         /* set the wire flags to return to client. */
1636         clid->flags = new->cl_exchange_flags;
1637 }
1638 
1639 static bool client_has_state(struct nfs4_client *clp)
1640 {
1641         /*
1642          * Note clp->cl_openowners check isn't quite right: there's no
1643          * need to count owners without stateid's.
1644          *
1645          * Also note we should probably be using this in 4.0 case too.
1646          */
1647         return !list_empty(&clp->cl_openowners)
1648                 || !list_empty(&clp->cl_delegations)
1649                 || !list_empty(&clp->cl_sessions);
1650 }
1651 
1652 __be32
1653 nfsd4_exchange_id(struct svc_rqst *rqstp,
1654                   struct nfsd4_compound_state *cstate,
1655                   struct nfsd4_exchange_id *exid)
1656 {
1657         struct nfs4_client *unconf, *conf, *new;
1658         __be32 status;
1659         char                    addr_str[INET6_ADDRSTRLEN];
1660         nfs4_verifier           verf = exid->verifier;
1661         struct sockaddr         *sa = svc_addr(rqstp);
1662         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1663         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1664 
1665         rpc_ntop(sa, addr_str, sizeof(addr_str));
1666         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1667                 "ip_addr=%s flags %x, spa_how %d\n",
1668                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1669                 addr_str, exid->flags, exid->spa_how);
1670 
1671         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1672                 return nfserr_inval;
1673 
1674         switch (exid->spa_how) {
1675         case SP4_MACH_CRED:
1676                 if (!svc_rqst_integrity_protected(rqstp))
1677                         return nfserr_inval;
1678         case SP4_NONE:
1679                 break;
1680         default:                                /* checked by xdr code */
1681                 WARN_ON_ONCE(1);
1682         case SP4_SSV:
1683                 return nfserr_encr_alg_unsupp;
1684         }
1685 
1686         /* Cases below refer to rfc 5661 section 18.35.4: */
1687         nfs4_lock_state();
1688         conf = find_confirmed_client_by_name(&exid->clname, nn);
1689         if (conf) {
1690                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1691                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1692 
1693                 if (update) {
1694                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1695                                 status = nfserr_inval;
1696                                 goto out;
1697                         }
1698                         if (!mach_creds_match(conf, rqstp)) {
1699                                 status = nfserr_wrong_cred;
1700                                 goto out;
1701                         }
1702                         if (!creds_match) { /* case 9 */
1703                                 status = nfserr_perm;
1704                                 goto out;
1705                         }
1706                         if (!verfs_match) { /* case 8 */
1707                                 status = nfserr_not_same;
1708                                 goto out;
1709                         }
1710                         /* case 6 */
1711                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1712                         new = conf;
1713                         goto out_copy;
1714                 }
1715                 if (!creds_match) { /* case 3 */
1716                         if (client_has_state(conf)) {
1717                                 status = nfserr_clid_inuse;
1718                                 goto out;
1719                         }
1720                         expire_client(conf);
1721                         goto out_new;
1722                 }
1723                 if (verfs_match) { /* case 2 */
1724                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1725                         new = conf;
1726                         goto out_copy;
1727                 }
1728                 /* case 5, client reboot */
1729                 goto out_new;
1730         }
1731 
1732         if (update) { /* case 7 */
1733                 status = nfserr_noent;
1734                 goto out;
1735         }
1736 
1737         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1738         if (unconf) /* case 4, possible retry or client restart */
1739                 expire_client(unconf);
1740 
1741         /* case 1 (normal case) */
1742 out_new:
1743         new = create_client(exid->clname, rqstp, &verf);
1744         if (new == NULL) {
1745                 status = nfserr_jukebox;
1746                 goto out;
1747         }
1748         new->cl_minorversion = cstate->minorversion;
1749         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1750 
1751         gen_clid(new, nn);
1752         add_to_unconfirmed(new);
1753 out_copy:
1754         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1755         exid->clientid.cl_id = new->cl_clientid.cl_id;
1756 
1757         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1758         nfsd4_set_ex_flags(new, exid);
1759 
1760         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1761                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1762         status = nfs_ok;
1763 
1764 out:
1765         nfs4_unlock_state();
1766         return status;
1767 }
1768 
1769 static __be32
1770 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1771 {
1772         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1773                 slot_seqid);
1774 
1775         /* The slot is in use, and no response has been sent. */
1776         if (slot_inuse) {
1777                 if (seqid == slot_seqid)
1778                         return nfserr_jukebox;
1779                 else
1780                         return nfserr_seq_misordered;
1781         }
1782         /* Note unsigned 32-bit arithmetic handles wraparound: */
1783         if (likely(seqid == slot_seqid + 1))
1784                 return nfs_ok;
1785         if (seqid == slot_seqid)
1786                 return nfserr_replay_cache;
1787         return nfserr_seq_misordered;
1788 }
1789 
1790 /*
1791  * Cache the create session result into the create session single DRC
1792  * slot cache by saving the xdr structure. sl_seqid has been set.
1793  * Do this for solo or embedded create session operations.
1794  */
1795 static void
1796 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1797                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1798 {
1799         slot->sl_status = nfserr;
1800         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1801 }
1802 
1803 static __be32
1804 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1805                             struct nfsd4_clid_slot *slot)
1806 {
1807         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1808         return slot->sl_status;
1809 }
1810 
1811 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1812                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1813                         1 +     /* MIN tag is length with zero, only length */ \
1814                         3 +     /* version, opcount, opcode */ \
1815                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1816                                 /* seqid, slotID, slotID, cache */ \
1817                         4 ) * sizeof(__be32))
1818 
1819 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1820                         2 +     /* verifier: AUTH_NULL, length 0 */\
1821                         1 +     /* status */ \
1822                         1 +     /* MIN tag is length with zero, only length */ \
1823                         3 +     /* opcount, opcode, opstatus*/ \
1824                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1825                                 /* seqid, slotID, slotID, slotID, status */ \
1826                         5 ) * sizeof(__be32))
1827 
1828 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1829 {
1830         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1831 
1832         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1833                 return nfserr_toosmall;
1834         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1835                 return nfserr_toosmall;
1836         ca->headerpadsz = 0;
1837         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1838         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1839         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1840         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1841                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1842         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1843         /*
1844          * Note decreasing slot size below client's request may make it
1845          * difficult for client to function correctly, whereas
1846          * decreasing the number of slots will (just?) affect
1847          * performance.  When short on memory we therefore prefer to
1848          * decrease number of slots instead of their size.  Clients that
1849          * request larger slots than they need will get poor results:
1850          */
1851         ca->maxreqs = nfsd4_get_drc_mem(ca);
1852         if (!ca->maxreqs)
1853                 return nfserr_jukebox;
1854 
1855         return nfs_ok;
1856 }
1857 
1858 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
1859                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1860 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
1861                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
1862 
1863 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1864 {
1865         ca->headerpadsz = 0;
1866 
1867         /*
1868          * These RPC_MAX_HEADER macros are overkill, especially since we
1869          * don't even do gss on the backchannel yet.  But this is still
1870          * less than 1k.  Tighten up this estimate in the unlikely event
1871          * it turns out to be a problem for some client:
1872          */
1873         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1874                 return nfserr_toosmall;
1875         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1876                 return nfserr_toosmall;
1877         ca->maxresp_cached = 0;
1878         if (ca->maxops < 2)
1879                 return nfserr_toosmall;
1880 
1881         return nfs_ok;
1882 }
1883 
1884 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1885 {
1886         switch (cbs->flavor) {
1887         case RPC_AUTH_NULL:
1888         case RPC_AUTH_UNIX:
1889                 return nfs_ok;
1890         default:
1891                 /*
1892                  * GSS case: the spec doesn't allow us to return this
1893                  * error.  But it also doesn't allow us not to support
1894                  * GSS.
1895                  * I'd rather this fail hard than return some error the
1896                  * client might think it can already handle:
1897                  */
1898                 return nfserr_encr_alg_unsupp;
1899         }
1900 }
1901 
1902 __be32
1903 nfsd4_create_session(struct svc_rqst *rqstp,
1904                      struct nfsd4_compound_state *cstate,
1905                      struct nfsd4_create_session *cr_ses)
1906 {
1907         struct sockaddr *sa = svc_addr(rqstp);
1908         struct nfs4_client *conf, *unconf;
1909         struct nfsd4_session *new;
1910         struct nfsd4_conn *conn;
1911         struct nfsd4_clid_slot *cs_slot = NULL;
1912         __be32 status = 0;
1913         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1914 
1915         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1916                 return nfserr_inval;
1917         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1918         if (status)
1919                 return status;
1920         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1921         if (status)
1922                 return status;
1923         status = check_backchannel_attrs(&cr_ses->back_channel);
1924         if (status)
1925                 goto out_release_drc_mem;
1926         status = nfserr_jukebox;
1927         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
1928         if (!new)
1929                 goto out_release_drc_mem;
1930         conn = alloc_conn_from_crses(rqstp, cr_ses);
1931         if (!conn)
1932                 goto out_free_session;
1933 
1934         nfs4_lock_state();
1935         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1936         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1937         WARN_ON_ONCE(conf && unconf);
1938 
1939         if (conf) {
1940                 status = nfserr_wrong_cred;
1941                 if (!mach_creds_match(conf, rqstp))
1942                         goto out_free_conn;
1943                 cs_slot = &conf->cl_cs_slot;
1944                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1945                 if (status == nfserr_replay_cache) {
1946                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1947                         goto out_free_conn;
1948                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1949                         status = nfserr_seq_misordered;
1950                         goto out_free_conn;
1951                 }
1952         } else if (unconf) {
1953                 struct nfs4_client *old;
1954                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1955                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1956                         status = nfserr_clid_inuse;
1957                         goto out_free_conn;
1958                 }
1959                 status = nfserr_wrong_cred;
1960                 if (!mach_creds_match(unconf, rqstp))
1961                         goto out_free_conn;
1962                 cs_slot = &unconf->cl_cs_slot;
1963                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1964                 if (status) {
1965                         /* an unconfirmed replay returns misordered */
1966                         status = nfserr_seq_misordered;
1967                         goto out_free_conn;
1968                 }
1969                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1970                 if (old) {
1971                         status = mark_client_expired(old);
1972                         if (status)
1973                                 goto out_free_conn;
1974                         expire_client(old);
1975                 }
1976                 move_to_confirmed(unconf);
1977                 conf = unconf;
1978         } else {
1979                 status = nfserr_stale_clientid;
1980                 goto out_free_conn;
1981         }
1982         status = nfs_ok;
1983         /*
1984          * We do not support RDMA or persistent sessions
1985          */
1986         cr_ses->flags &= ~SESSION4_PERSIST;
1987         cr_ses->flags &= ~SESSION4_RDMA;
1988 
1989         init_session(rqstp, new, conf, cr_ses);
1990         nfsd4_init_conn(rqstp, conn, new);
1991 
1992         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1993                NFS4_MAX_SESSIONID_LEN);
1994         cs_slot->sl_seqid++;
1995         cr_ses->seqid = cs_slot->sl_seqid;
1996 
1997         /* cache solo and embedded create sessions under the state lock */
1998         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1999         nfs4_unlock_state();
2000         return status;
2001 out_free_conn:
2002         nfs4_unlock_state();
2003         free_conn(conn);
2004 out_free_session:
2005         __free_session(new);
2006 out_release_drc_mem:
2007         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2008         return status;
2009 }
2010 
2011 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2012 {
2013         switch (*dir) {
2014         case NFS4_CDFC4_FORE:
2015         case NFS4_CDFC4_BACK:
2016                 return nfs_ok;
2017         case NFS4_CDFC4_FORE_OR_BOTH:
2018         case NFS4_CDFC4_BACK_OR_BOTH:
2019                 *dir = NFS4_CDFC4_BOTH;
2020                 return nfs_ok;
2021         };
2022         return nfserr_inval;
2023 }
2024 
2025 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2026 {
2027         struct nfsd4_session *session = cstate->session;
2028         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2029         __be32 status;
2030 
2031         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2032         if (status)
2033                 return status;
2034         spin_lock(&nn->client_lock);
2035         session->se_cb_prog = bc->bc_cb_program;
2036         session->se_cb_sec = bc->bc_cb_sec;
2037         spin_unlock(&nn->client_lock);
2038 
2039         nfsd4_probe_callback(session->se_client);
2040 
2041         return nfs_ok;
2042 }
2043 
2044 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2045                      struct nfsd4_compound_state *cstate,
2046                      struct nfsd4_bind_conn_to_session *bcts)
2047 {
2048         __be32 status;
2049         struct nfsd4_conn *conn;
2050         struct nfsd4_session *session;
2051         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2052 
2053         if (!nfsd4_last_compound_op(rqstp))
2054                 return nfserr_not_only_op;
2055         nfs4_lock_state();
2056         spin_lock(&nn->client_lock);
2057         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2058         spin_unlock(&nn->client_lock);
2059         status = nfserr_badsession;
2060         if (!session)
2061                 goto out;
2062         status = nfserr_wrong_cred;
2063         if (!mach_creds_match(session->se_client, rqstp))
2064                 goto out;
2065         status = nfsd4_map_bcts_dir(&bcts->dir);
2066         if (status)
2067                 goto out;
2068         conn = alloc_conn(rqstp, bcts->dir);
2069         status = nfserr_jukebox;
2070         if (!conn)
2071                 goto out;
2072         nfsd4_init_conn(rqstp, conn, session);
2073         status = nfs_ok;
2074 out:
2075         nfs4_unlock_state();
2076         return status;
2077 }
2078 
2079 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2080 {
2081         if (!session)
2082                 return 0;
2083         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2084 }
2085 
2086 __be32
2087 nfsd4_destroy_session(struct svc_rqst *r,
2088                       struct nfsd4_compound_state *cstate,
2089                       struct nfsd4_destroy_session *sessionid)
2090 {
2091         struct nfsd4_session *ses;
2092         __be32 status;
2093         int ref_held_by_me = 0;
2094         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2095 
2096         nfs4_lock_state();
2097         status = nfserr_not_only_op;
2098         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2099                 if (!nfsd4_last_compound_op(r))
2100                         goto out;
2101                 ref_held_by_me++;
2102         }
2103         dump_sessionid(__func__, &sessionid->sessionid);
2104         spin_lock(&nn->client_lock);
2105         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2106         status = nfserr_badsession;
2107         if (!ses)
2108                 goto out_client_lock;
2109         status = nfserr_wrong_cred;
2110         if (!mach_creds_match(ses->se_client, r))
2111                 goto out_client_lock;
2112         nfsd4_get_session_locked(ses);
2113         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2114         if (status)
2115                 goto out_put_session;
2116         unhash_session(ses);
2117         spin_unlock(&nn->client_lock);
2118 
2119         nfsd4_probe_callback_sync(ses->se_client);
2120 
2121         spin_lock(&nn->client_lock);
2122         status = nfs_ok;
2123 out_put_session:
2124         nfsd4_put_session(ses);
2125 out_client_lock:
2126         spin_unlock(&nn->client_lock);
2127 out:
2128         nfs4_unlock_state();
2129         return status;
2130 }
2131 
2132 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2133 {
2134         struct nfsd4_conn *c;
2135 
2136         list_for_each_entry(c, &s->se_conns, cn_persession) {
2137                 if (c->cn_xprt == xpt) {
2138                         return c;
2139                 }
2140         }
2141         return NULL;
2142 }
2143 
2144 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2145 {
2146         struct nfs4_client *clp = ses->se_client;
2147         struct nfsd4_conn *c;
2148         __be32 status = nfs_ok;
2149         int ret;
2150 
2151         spin_lock(&clp->cl_lock);
2152         c = __nfsd4_find_conn(new->cn_xprt, ses);
2153         if (c)
2154                 goto out_free;
2155         status = nfserr_conn_not_bound_to_session;
2156         if (clp->cl_mach_cred)
2157                 goto out_free;
2158         __nfsd4_hash_conn(new, ses);
2159         spin_unlock(&clp->cl_lock);
2160         ret = nfsd4_register_conn(new);
2161         if (ret)
2162                 /* oops; xprt is already down: */
2163                 nfsd4_conn_lost(&new->cn_xpt_user);
2164         return nfs_ok;
2165 out_free:
2166         spin_unlock(&clp->cl_lock);
2167         free_conn(new);
2168         return status;
2169 }
2170 
2171 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2172 {
2173         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2174 
2175         return args->opcnt > session->se_fchannel.maxops;
2176 }
2177 
2178 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2179                                   struct nfsd4_session *session)
2180 {
2181         struct xdr_buf *xb = &rqstp->rq_arg;
2182 
2183         return xb->len > session->se_fchannel.maxreq_sz;
2184 }
2185 
2186 __be32
2187 nfsd4_sequence(struct svc_rqst *rqstp,
2188                struct nfsd4_compound_state *cstate,
2189                struct nfsd4_sequence *seq)
2190 {
2191         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2192         struct nfsd4_session *session;
2193         struct nfs4_client *clp;
2194         struct nfsd4_slot *slot;
2195         struct nfsd4_conn *conn;
2196         __be32 status;
2197         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2198 
2199         if (resp->opcnt != 1)
2200                 return nfserr_sequence_pos;
2201 
2202         /*
2203          * Will be either used or freed by nfsd4_sequence_check_conn
2204          * below.
2205          */
2206         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2207         if (!conn)
2208                 return nfserr_jukebox;
2209 
2210         spin_lock(&nn->client_lock);
2211         status = nfserr_badsession;
2212         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2213         if (!session)
2214                 goto out_no_session;
2215         clp = session->se_client;
2216         status = get_client_locked(clp);
2217         if (status)
2218                 goto out_no_session;
2219         status = nfsd4_get_session_locked(session);
2220         if (status)
2221                 goto out_put_client;
2222 
2223         status = nfserr_too_many_ops;
2224         if (nfsd4_session_too_many_ops(rqstp, session))
2225                 goto out_put_session;
2226 
2227         status = nfserr_req_too_big;
2228         if (nfsd4_request_too_big(rqstp, session))
2229                 goto out_put_session;
2230 
2231         status = nfserr_badslot;
2232         if (seq->slotid >= session->se_fchannel.maxreqs)
2233                 goto out_put_session;
2234 
2235         slot = session->se_slots[seq->slotid];
2236         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2237 
2238         /* We do not negotiate the number of slots yet, so set the
2239          * maxslots to the session maxreqs which is used to encode
2240          * sr_highest_slotid and the sr_target_slot id to maxslots */
2241         seq->maxslots = session->se_fchannel.maxreqs;
2242 
2243         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2244                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2245         if (status == nfserr_replay_cache) {
2246                 status = nfserr_seq_misordered;
2247                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2248                         goto out_put_session;
2249                 cstate->slot = slot;
2250                 cstate->session = session;
2251                 /* Return the cached reply status and set cstate->status
2252                  * for nfsd4_proc_compound processing */
2253                 status = nfsd4_replay_cache_entry(resp, seq);
2254                 cstate->status = nfserr_replay_cache;
2255                 goto out;
2256         }
2257         if (status)
2258                 goto out_put_session;
2259 
2260         status = nfsd4_sequence_check_conn(conn, session);
2261         conn = NULL;
2262         if (status)
2263                 goto out_put_session;
2264 
2265         /* Success! bump slot seqid */
2266         slot->sl_seqid = seq->seqid;
2267         slot->sl_flags |= NFSD4_SLOT_INUSE;
2268         if (seq->cachethis)
2269                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2270         else
2271                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2272 
2273         cstate->slot = slot;
2274         cstate->session = session;
2275 
2276 out:
2277         switch (clp->cl_cb_state) {
2278         case NFSD4_CB_DOWN:
2279                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2280                 break;
2281         case NFSD4_CB_FAULT:
2282                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2283                 break;
2284         default:
2285                 seq->status_flags = 0;
2286         }
2287         if (!list_empty(&clp->cl_revoked))
2288                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2289 out_no_session:
2290         kfree(conn);
2291         spin_unlock(&nn->client_lock);
2292         return status;
2293 out_put_session:
2294         nfsd4_put_session(session);
2295 out_put_client:
2296         put_client_renew_locked(clp);
2297         goto out_no_session;
2298 }
2299 
2300 __be32
2301 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2302 {
2303         struct nfs4_client *conf, *unconf, *clp;
2304         __be32 status = 0;
2305         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2306 
2307         nfs4_lock_state();
2308         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2309         conf = find_confirmed_client(&dc->clientid, true, nn);
2310         WARN_ON_ONCE(conf && unconf);
2311 
2312         if (conf) {
2313                 clp = conf;
2314 
2315                 if (client_has_state(conf)) {
2316                         status = nfserr_clientid_busy;
2317                         goto out;
2318                 }
2319         } else if (unconf)
2320                 clp = unconf;
2321         else {
2322                 status = nfserr_stale_clientid;
2323                 goto out;
2324         }
2325         if (!mach_creds_match(clp, rqstp)) {
2326                 status = nfserr_wrong_cred;
2327                 goto out;
2328         }
2329         expire_client(clp);
2330 out:
2331         nfs4_unlock_state();
2332         return status;
2333 }
2334 
2335 __be32
2336 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2337 {
2338         __be32 status = 0;
2339 
2340         if (rc->rca_one_fs) {
2341                 if (!cstate->current_fh.fh_dentry)
2342                         return nfserr_nofilehandle;
2343                 /*
2344                  * We don't take advantage of the rca_one_fs case.
2345                  * That's OK, it's optional, we can safely ignore it.
2346                  */
2347                  return nfs_ok;
2348         }
2349 
2350         nfs4_lock_state();
2351         status = nfserr_complete_already;
2352         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2353                              &cstate->session->se_client->cl_flags))
2354                 goto out;
2355 
2356         status = nfserr_stale_clientid;
2357         if (is_client_expired(cstate->session->se_client))
2358                 /*
2359                  * The following error isn't really legal.
2360                  * But we only get here if the client just explicitly
2361                  * destroyed the client.  Surely it no longer cares what
2362                  * error it gets back on an operation for the dead
2363                  * client.
2364                  */
2365                 goto out;
2366 
2367         status = nfs_ok;
2368         nfsd4_client_record_create(cstate->session->se_client);
2369 out:
2370         nfs4_unlock_state();
2371         return status;
2372 }
2373 
2374 __be32
2375 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2376                   struct nfsd4_setclientid *setclid)
2377 {
2378         struct xdr_netobj       clname = setclid->se_name;
2379         nfs4_verifier           clverifier = setclid->se_verf;
2380         struct nfs4_client      *conf, *unconf, *new;
2381         __be32                  status;
2382         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2383 
2384         /* Cases below refer to rfc 3530 section 14.2.33: */
2385         nfs4_lock_state();
2386         conf = find_confirmed_client_by_name(&clname, nn);
2387         if (conf) {
2388                 /* case 0: */
2389                 status = nfserr_clid_inuse;
2390                 if (clp_used_exchangeid(conf))
2391                         goto out;
2392                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2393                         char addr_str[INET6_ADDRSTRLEN];
2394                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2395                                  sizeof(addr_str));
2396                         dprintk("NFSD: setclientid: string in use by client "
2397                                 "at %s\n", addr_str);
2398                         goto out;
2399                 }
2400         }
2401         unconf = find_unconfirmed_client_by_name(&clname, nn);
2402         if (unconf)
2403                 expire_client(unconf);
2404         status = nfserr_jukebox;
2405         new = create_client(clname, rqstp, &clverifier);
2406         if (new == NULL)
2407                 goto out;
2408         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2409                 /* case 1: probable callback update */
2410                 copy_clid(new, conf);
2411         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2412                 gen_clid(new, nn);
2413         new->cl_minorversion = 0;
2414         gen_callback(new, setclid, rqstp);
2415         add_to_unconfirmed(new);
2416         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2417         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2418         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2419         status = nfs_ok;
2420 out:
2421         nfs4_unlock_state();
2422         return status;
2423 }
2424 
2425 
2426 __be32
2427 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2428                          struct nfsd4_compound_state *cstate,
2429                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2430 {
2431         struct nfs4_client *conf, *unconf;
2432         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
2433         clientid_t * clid = &setclientid_confirm->sc_clientid;
2434         __be32 status;
2435         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2436 
2437         if (STALE_CLIENTID(clid, nn))
2438                 return nfserr_stale_clientid;
2439         nfs4_lock_state();
2440 
2441         conf = find_confirmed_client(clid, false, nn);
2442         unconf = find_unconfirmed_client(clid, false, nn);
2443         /*
2444          * We try hard to give out unique clientid's, so if we get an
2445          * attempt to confirm the same clientid with a different cred,
2446          * there's a bug somewhere.  Let's charitably assume it's our
2447          * bug.
2448          */
2449         status = nfserr_serverfault;
2450         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2451                 goto out;
2452         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2453                 goto out;
2454         /* cases below refer to rfc 3530 section 14.2.34: */
2455         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2456                 if (conf && !unconf) /* case 2: probable retransmit */
2457                         status = nfs_ok;
2458                 else /* case 4: client hasn't noticed we rebooted yet? */
2459                         status = nfserr_stale_clientid;
2460                 goto out;
2461         }
2462         status = nfs_ok;
2463         if (conf) { /* case 1: callback update */
2464                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2465                 nfsd4_probe_callback(conf);
2466                 expire_client(unconf);
2467         } else { /* case 3: normal case; new or rebooted client */
2468                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2469                 if (conf) {
2470                         status = mark_client_expired(conf);
2471                         if (status)
2472                                 goto out;
2473                         expire_client(conf);
2474                 }
2475                 move_to_confirmed(unconf);
2476                 nfsd4_probe_callback(unconf);
2477         }
2478 out:
2479         nfs4_unlock_state();
2480         return status;
2481 }
2482 
2483 static struct nfs4_file *nfsd4_alloc_file(void)
2484 {
2485         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2486 }
2487 
2488 /* OPEN Share state helper functions */
2489 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2490 {
2491         unsigned int hashval = file_hashval(ino);
2492 
2493         atomic_set(&fp->fi_ref, 1);
2494         INIT_LIST_HEAD(&fp->fi_stateids);
2495         INIT_LIST_HEAD(&fp->fi_delegations);
2496         fp->fi_inode = igrab(ino);
2497         fp->fi_had_conflict = false;
2498         fp->fi_lease = NULL;
2499         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2500         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2501         spin_lock(&recall_lock);
2502         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2503         spin_unlock(&recall_lock);
2504 }
2505 
2506 static void
2507 nfsd4_free_slab(struct kmem_cache **slab)
2508 {
2509         if (*slab == NULL)
2510                 return;
2511         kmem_cache_destroy(*slab);
2512         *slab = NULL;
2513 }
2514 
2515 void
2516 nfsd4_free_slabs(void)
2517 {
2518         nfsd4_free_slab(&openowner_slab);
2519         nfsd4_free_slab(&lockowner_slab);
2520         nfsd4_free_slab(&file_slab);
2521         nfsd4_free_slab(&stateid_slab);
2522         nfsd4_free_slab(&deleg_slab);
2523 }
2524 
2525 int
2526 nfsd4_init_slabs(void)
2527 {
2528         openowner_slab = kmem_cache_create("nfsd4_openowners",
2529                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2530         if (openowner_slab == NULL)
2531                 goto out_nomem;
2532         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2533                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2534         if (lockowner_slab == NULL)
2535                 goto out_nomem;
2536         file_slab = kmem_cache_create("nfsd4_files",
2537                         sizeof(struct nfs4_file), 0, 0, NULL);
2538         if (file_slab == NULL)
2539                 goto out_nomem;
2540         stateid_slab = kmem_cache_create("nfsd4_stateids",
2541                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2542         if (stateid_slab == NULL)
2543                 goto out_nomem;
2544         deleg_slab = kmem_cache_create("nfsd4_delegations",
2545                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2546         if (deleg_slab == NULL)
2547                 goto out_nomem;
2548         return 0;
2549 out_nomem:
2550         nfsd4_free_slabs();
2551         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2552         return -ENOMEM;
2553 }
2554 
2555 void nfs4_free_openowner(struct nfs4_openowner *oo)
2556 {
2557         kfree(oo->oo_owner.so_owner.data);
2558         kmem_cache_free(openowner_slab, oo);
2559 }
2560 
2561 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2562 {
2563         kfree(lo->lo_owner.so_owner.data);
2564         kmem_cache_free(lockowner_slab, lo);
2565 }
2566 
2567 static void init_nfs4_replay(struct nfs4_replay *rp)
2568 {
2569         rp->rp_status = nfserr_serverfault;
2570         rp->rp_buflen = 0;
2571         rp->rp_buf = rp->rp_ibuf;
2572 }
2573 
2574 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2575 {
2576         struct nfs4_stateowner *sop;
2577 
2578         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2579         if (!sop)
2580                 return NULL;
2581 
2582         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2583         if (!sop->so_owner.data) {
2584                 kmem_cache_free(slab, sop);
2585                 return NULL;
2586         }
2587         sop->so_owner.len = owner->len;
2588 
2589         INIT_LIST_HEAD(&sop->so_stateids);
2590         sop->so_client = clp;
2591         init_nfs4_replay(&sop->so_replay);
2592         return sop;
2593 }
2594 
2595 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2596 {
2597         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2598 
2599         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2600         list_add(&oo->oo_perclient, &clp->cl_openowners);
2601 }
2602 
2603 static struct nfs4_openowner *
2604 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2605         struct nfs4_openowner *oo;
2606 
2607         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2608         if (!oo)
2609                 return NULL;
2610         oo->oo_owner.so_is_open_owner = 1;
2611         oo->oo_owner.so_seqid = open->op_seqid;
2612         oo->oo_flags = NFS4_OO_NEW;
2613         oo->oo_time = 0;
2614         oo->oo_last_closed_stid = NULL;
2615         INIT_LIST_HEAD(&oo->oo_close_lru);
2616         hash_openowner(oo, clp, strhashval);
2617         return oo;
2618 }
2619 
2620 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2621         struct nfs4_openowner *oo = open->op_openowner;
2622 
2623         stp->st_stid.sc_type = NFS4_OPEN_STID;
2624         INIT_LIST_HEAD(&stp->st_lockowners);
2625         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2626         list_add(&stp->st_perfile, &fp->fi_stateids);
2627         stp->st_stateowner = &oo->oo_owner;
2628         get_nfs4_file(fp);
2629         stp->st_file = fp;
2630         stp->st_access_bmap = 0;
2631         stp->st_deny_bmap = 0;
2632         set_access(open->op_share_access, stp);
2633         set_deny(open->op_share_deny, stp);
2634         stp->st_openstp = NULL;
2635 }
2636 
2637 static void
2638 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2639 {
2640         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2641 
2642         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2643 
2644         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2645         oo->oo_time = get_seconds();
2646 }
2647 
2648 static int
2649 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2650                                                         clientid_t *clid)
2651 {
2652         return (sop->so_owner.len == owner->len) &&
2653                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2654                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2655 }
2656 
2657 static struct nfs4_openowner *
2658 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2659                         bool sessions, struct nfsd_net *nn)
2660 {
2661         struct nfs4_stateowner *so;
2662         struct nfs4_openowner *oo;
2663         struct nfs4_client *clp;
2664 
2665         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2666                 if (!so->so_is_open_owner)
2667                         continue;
2668                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2669                         oo = openowner(so);
2670                         clp = oo->oo_owner.so_client;
2671                         if ((bool)clp->cl_minorversion != sessions)
2672                                 return NULL;
2673                         renew_client(oo->oo_owner.so_client);
2674                         return oo;
2675                 }
2676         }
2677         return NULL;
2678 }
2679 
2680 /* search file_hashtbl[] for file */
2681 static struct nfs4_file *
2682 find_file(struct inode *ino)
2683 {
2684         unsigned int hashval = file_hashval(ino);
2685         struct nfs4_file *fp;
2686 
2687         spin_lock(&recall_lock);
2688         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2689                 if (fp->fi_inode == ino) {
2690                         get_nfs4_file(fp);
2691                         spin_unlock(&recall_lock);
2692                         return fp;
2693                 }
2694         }
2695         spin_unlock(&recall_lock);
2696         return NULL;
2697 }
2698 
2699 /*
2700  * Called to check deny when READ with all zero stateid or
2701  * WRITE with all zero or all one stateid
2702  */
2703 static __be32
2704 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2705 {
2706         struct inode *ino = current_fh->fh_dentry->d_inode;
2707         struct nfs4_file *fp;
2708         struct nfs4_ol_stateid *stp;
2709         __be32 ret;
2710 
2711         fp = find_file(ino);
2712         if (!fp)
2713                 return nfs_ok;
2714         ret = nfserr_locked;
2715         /* Search for conflicting share reservations */
2716         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2717                 if (test_deny(deny_type, stp) ||
2718                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2719                         goto out;
2720         }
2721         ret = nfs_ok;
2722 out:
2723         put_nfs4_file(fp);
2724         return ret;
2725 }
2726 
2727 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2728 {
2729         struct nfs4_client *clp = dp->dl_stid.sc_client;
2730         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2731 
2732         /* We're assuming the state code never drops its reference
2733          * without first removing the lease.  Since we're in this lease
2734          * callback (and since the lease code is serialized by the kernel
2735          * lock) we know the server hasn't removed the lease yet, we know
2736          * it's safe to take a reference: */
2737         atomic_inc(&dp->dl_count);
2738 
2739         list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2740 
2741         /* Only place dl_time is set; protected by i_lock: */
2742         dp->dl_time = get_seconds();
2743 
2744         nfsd4_cb_recall(dp);
2745 }
2746 
2747 /* Called from break_lease() with i_lock held. */
2748 static void nfsd_break_deleg_cb(struct file_lock *fl)
2749 {
2750         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2751         struct nfs4_delegation *dp;
2752 
2753         if (!fp) {
2754                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2755                 return;
2756         }
2757         if (fp->fi_had_conflict) {
2758                 WARN(1, "duplicate break on %p\n", fp);
2759                 return;
2760         }
2761         /*
2762          * We don't want the locks code to timeout the lease for us;
2763          * we'll remove it ourself if a delegation isn't returned
2764          * in time:
2765          */
2766         fl->fl_break_time = 0;
2767 
2768         spin_lock(&recall_lock);
2769         fp->fi_had_conflict = true;
2770         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2771                 nfsd_break_one_deleg(dp);
2772         spin_unlock(&recall_lock);
2773 }
2774 
2775 static
2776 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2777 {
2778         if (arg & F_UNLCK)
2779                 return lease_modify(onlist, arg);
2780         else
2781                 return -EAGAIN;
2782 }
2783 
2784 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2785         .lm_break = nfsd_break_deleg_cb,
2786         .lm_change = nfsd_change_deleg_cb,
2787 };
2788 
2789 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2790 {
2791         if (nfsd4_has_session(cstate))
2792                 return nfs_ok;
2793         if (seqid == so->so_seqid - 1)
2794                 return nfserr_replay_me;
2795         if (seqid == so->so_seqid)
2796                 return nfs_ok;
2797         return nfserr_bad_seqid;
2798 }
2799 
2800 __be32
2801 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2802                     struct nfsd4_open *open, struct nfsd_net *nn)
2803 {
2804         clientid_t *clientid = &open->op_clientid;
2805         struct nfs4_client *clp = NULL;
2806         unsigned int strhashval;
2807         struct nfs4_openowner *oo = NULL;
2808         __be32 status;
2809 
2810         if (STALE_CLIENTID(&open->op_clientid, nn))
2811                 return nfserr_stale_clientid;
2812         /*
2813          * In case we need it later, after we've already created the
2814          * file and don't want to risk a further failure:
2815          */
2816         open->op_file = nfsd4_alloc_file();
2817         if (open->op_file == NULL)
2818                 return nfserr_jukebox;
2819 
2820         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2821         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2822         open->op_openowner = oo;
2823         if (!oo) {
2824                 clp = find_confirmed_client(clientid, cstate->minorversion,
2825                                             nn);
2826                 if (clp == NULL)
2827                         return nfserr_expired;
2828                 goto new_owner;
2829         }
2830         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2831                 /* Replace unconfirmed owners without checking for replay. */
2832                 clp = oo->oo_owner.so_client;
2833                 release_openowner(oo);
2834                 open->op_openowner = NULL;
2835                 goto new_owner;
2836         }
2837         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2838         if (status)
2839                 return status;
2840         clp = oo->oo_owner.so_client;
2841         goto alloc_stateid;
2842 new_owner:
2843         oo = alloc_init_open_stateowner(strhashval, clp, open);
2844         if (oo == NULL)
2845                 return nfserr_jukebox;
2846         open->op_openowner = oo;
2847 alloc_stateid:
2848         open->op_stp = nfs4_alloc_stateid(clp);
2849         if (!open->op_stp)
2850                 return nfserr_jukebox;
2851         return nfs_ok;
2852 }
2853 
2854 static inline __be32
2855 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2856 {
2857         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2858                 return nfserr_openmode;
2859         else
2860                 return nfs_ok;
2861 }
2862 
2863 static int share_access_to_flags(u32 share_access)
2864 {
2865         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2866 }
2867 
2868 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2869 {
2870         struct nfs4_stid *ret;
2871 
2872         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2873         if (!ret)
2874                 return NULL;
2875         return delegstateid(ret);
2876 }
2877 
2878 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2879 {
2880         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2881                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2882 }
2883 
2884 static __be32
2885 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2886                 struct nfs4_delegation **dp)
2887 {
2888         int flags;
2889         __be32 status = nfserr_bad_stateid;
2890 
2891         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2892         if (*dp == NULL)
2893                 goto out;
2894         flags = share_access_to_flags(open->op_share_access);
2895         status = nfs4_check_delegmode(*dp, flags);
2896         if (status)
2897                 *dp = NULL;
2898 out:
2899         if (!nfsd4_is_deleg_cur(open))
2900                 return nfs_ok;
2901         if (status)
2902                 return status;
2903         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2904         return nfs_ok;
2905 }
2906 
2907 static __be32
2908 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2909 {
2910         struct nfs4_ol_stateid *local;
2911         struct nfs4_openowner *oo = open->op_openowner;
2912 
2913         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2914                 /* ignore lock owners */
2915                 if (local->st_stateowner->so_is_open_owner == 0)
2916                         continue;
2917                 /* remember if we have seen this open owner */
2918                 if (local->st_stateowner == &oo->oo_owner)
2919                         *stpp = local;
2920                 /* check for conflicting share reservations */
2921                 if (!test_share(local, open))
2922                         return nfserr_share_denied;
2923         }
2924         return nfs_ok;
2925 }
2926 
2927 static inline int nfs4_access_to_access(u32 nfs4_access)
2928 {
2929         int flags = 0;
2930 
2931         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2932                 flags |= NFSD_MAY_READ;
2933         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2934                 flags |= NFSD_MAY_WRITE;
2935         return flags;
2936 }
2937 
2938 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2939                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2940 {
2941         __be32 status;
2942         int oflag = nfs4_access_to_omode(open->op_share_access);
2943         int access = nfs4_access_to_access(open->op_share_access);
2944 
2945         if (!fp->fi_fds[oflag]) {
2946                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2947                         &fp->fi_fds[oflag]);
2948                 if (status)
2949                         return status;
2950         }
2951         nfs4_file_get_access(fp, oflag);
2952 
2953         return nfs_ok;
2954 }
2955 
2956 static inline __be32
2957 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2958                 struct nfsd4_open *open)
2959 {
2960         struct iattr iattr = {
2961                 .ia_valid = ATTR_SIZE,
2962                 .ia_size = 0,
2963         };
2964         if (!open->op_truncate)
2965                 return 0;
2966         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2967                 return nfserr_inval;
2968         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2969 }
2970 
2971 static __be32
2972 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
2973 {
2974         u32 op_share_access = open->op_share_access;
2975         bool new_access;
2976         __be32 status;
2977 
2978         new_access = !test_access(op_share_access, stp);
2979         if (new_access) {
2980                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2981                 if (status)
2982                         return status;
2983         }
2984         status = nfsd4_truncate(rqstp, cur_fh, open);
2985         if (status) {
2986                 if (new_access) {
2987                         int oflag = nfs4_access_to_omode(op_share_access);
2988                         nfs4_file_put_access(fp, oflag);
2989                 }
2990                 return status;
2991         }
2992         /* remember the open */
2993         set_access(op_share_access, stp);
2994         set_deny(open->op_share_deny, stp);
2995 
2996         return nfs_ok;
2997 }
2998 
2999 
3000 static void
3001 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3002 {
3003         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3004 }
3005 
3006 /* Should we give out recallable state?: */
3007 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3008 {
3009         if (clp->cl_cb_state == NFSD4_CB_UP)
3010                 return true;
3011         /*
3012          * In the sessions case, since we don't have to establish a
3013          * separate connection for callbacks, we assume it's OK
3014          * until we hear otherwise:
3015          */
3016         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3017 }
3018 
3019 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3020 {
3021         struct file_lock *fl;
3022 
3023         fl = locks_alloc_lock();
3024         if (!fl)
3025                 return NULL;
3026         locks_init_lock(fl);
3027         fl->fl_lmops = &nfsd_lease_mng_ops;
3028         fl->fl_flags = FL_DELEG;
3029         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3030         fl->fl_end = OFFSET_MAX;
3031         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3032         fl->fl_pid = current->tgid;
3033         return fl;
3034 }
3035 
3036 static int nfs4_setlease(struct nfs4_delegation *dp)
3037 {
3038         struct nfs4_file *fp = dp->dl_file;
3039         struct file_lock *fl;
3040         int status;
3041 
3042         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3043         if (!fl)
3044                 return -ENOMEM;
3045         fl->fl_file = find_readable_file(fp);
3046         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3047         if (status)
3048                 goto out_free;
3049         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3050         fp->fi_lease = fl;
3051         fp->fi_deleg_file = get_file(fl->fl_file);
3052         atomic_set(&fp->fi_delegees, 1);
3053         list_add(&dp->dl_perfile, &fp->fi_delegations);
3054         return 0;
3055 out_free:
3056         locks_free_lock(fl);
3057         return status;
3058 }
3059 
3060 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3061 {
3062         int status;
3063 
3064         if (fp->fi_had_conflict)
3065                 return -EAGAIN;
3066         get_nfs4_file(fp);
3067         dp->dl_file = fp;
3068         if (!fp->fi_lease) {
3069                 status = nfs4_setlease(dp);
3070                 if (status)
3071                         goto out_free;
3072                 return 0;
3073         }
3074         spin_lock(&recall_lock);
3075         if (fp->fi_had_conflict) {
3076                 spin_unlock(&recall_lock);
3077                 status = -EAGAIN;
3078                 goto out_free;
3079         }
3080         atomic_inc(&fp->fi_delegees);
3081         list_add(&dp->dl_perfile, &fp->fi_delegations);
3082         spin_unlock(&recall_lock);
3083         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3084         return 0;
3085 out_free:
3086         put_nfs4_file(fp);
3087         dp->dl_file = fp;
3088         return status;
3089 }
3090 
3091 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3092 {
3093         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3094         if (status == -EAGAIN)
3095                 open->op_why_no_deleg = WND4_CONTENTION;
3096         else {
3097                 open->op_why_no_deleg = WND4_RESOURCE;
3098                 switch (open->op_deleg_want) {
3099                 case NFS4_SHARE_WANT_READ_DELEG:
3100                 case NFS4_SHARE_WANT_WRITE_DELEG:
3101                 case NFS4_SHARE_WANT_ANY_DELEG:
3102                         break;
3103                 case NFS4_SHARE_WANT_CANCEL:
3104                         open->op_why_no_deleg = WND4_CANCELLED;
3105                         break;
3106                 case NFS4_SHARE_WANT_NO_DELEG:
3107                         WARN_ON_ONCE(1);
3108                 }
3109         }
3110 }
3111 
3112 /*
3113  * Attempt to hand out a delegation.
3114  *
3115  * Note we don't support write delegations, and won't until the vfs has
3116  * proper support for them.
3117  */
3118 static void
3119 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3120                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3121 {
3122         struct nfs4_delegation *dp;
3123         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3124         int cb_up;
3125         int status = 0;
3126 
3127         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3128         open->op_recall = 0;
3129         switch (open->op_claim_type) {
3130                 case NFS4_OPEN_CLAIM_PREVIOUS:
3131                         if (!cb_up)
3132                                 open->op_recall = 1;
3133                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3134                                 goto out_no_deleg;
3135                         break;
3136                 case NFS4_OPEN_CLAIM_NULL:
3137                 case NFS4_OPEN_CLAIM_FH:
3138                         /*
3139                          * Let's not give out any delegations till everyone's
3140                          * had the chance to reclaim theirs....
3141                          */
3142                         if (locks_in_grace(net))
3143                                 goto out_no_deleg;
3144                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3145                                 goto out_no_deleg;
3146                         /*
3147                          * Also, if the file was opened for write or
3148                          * create, there's a good chance the client's
3149                          * about to write to it, resulting in an
3150                          * immediate recall (since we don't support
3151                          * write delegations):
3152                          */
3153                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3154                                 goto out_no_deleg;
3155                         if (open->op_create == NFS4_OPEN_CREATE)
3156                                 goto out_no_deleg;
3157                         break;
3158                 default:
3159                         goto out_no_deleg;
3160         }
3161         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3162         if (dp == NULL)
3163                 goto out_no_deleg;
3164         status = nfs4_set_delegation(dp, stp->st_file);
3165         if (status)
3166                 goto out_free;
3167 
3168         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3169 
3170         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3171                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3172         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3173         return;
3174 out_free:
3175         remove_stid(&dp->dl_stid);
3176         nfs4_put_delegation(dp);
3177 out_no_deleg:
3178         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3179         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3180             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3181                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3182                 open->op_recall = 1;
3183         }
3184 
3185         /* 4.1 client asking for a delegation? */
3186         if (open->op_deleg_want)
3187                 nfsd4_open_deleg_none_ext(open, status);
3188         return;
3189 }
3190 
3191 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3192                                         struct nfs4_delegation *dp)
3193 {
3194         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3195             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3196                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3197                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3198         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3199                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3200                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3201                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3202         }
3203         /* Otherwise the client must be confused wanting a delegation
3204          * it already has, therefore we don't return
3205          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3206          */
3207 }
3208 
3209 /*
3210  * called with nfs4_lock_state() held.
3211  */
3212 __be32
3213 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3214 {
3215         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3216         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3217         struct nfs4_file *fp = NULL;
3218         struct inode *ino = current_fh->fh_dentry->d_inode;
3219         struct nfs4_ol_stateid *stp = NULL;
3220         struct nfs4_delegation *dp = NULL;
3221         __be32 status;
3222 
3223         /*
3224          * Lookup file; if found, lookup stateid and check open request,
3225          * and check for delegations in the process of being recalled.
3226          * If not found, create the nfs4_file struct
3227          */
3228         fp = find_file(ino);
3229         if (fp) {
3230                 if ((status = nfs4_check_open(fp, open, &stp)))
3231                         goto out;
3232                 status = nfs4_check_deleg(cl, open, &dp);
3233                 if (status)
3234                         goto out;
3235         } else {
3236                 status = nfserr_bad_stateid;
3237                 if (nfsd4_is_deleg_cur(open))
3238                         goto out;
3239                 status = nfserr_jukebox;
3240                 fp = open->op_file;
3241                 open->op_file = NULL;
3242                 nfsd4_init_file(fp, ino);
3243         }
3244 
3245         /*
3246          * OPEN the file, or upgrade an existing OPEN.
3247          * If truncate fails, the OPEN fails.
3248          */
3249         if (stp) {
3250                 /* Stateid was found, this is an OPEN upgrade */
3251                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3252                 if (status)
3253                         goto out;
3254         } else {
3255                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3256                 if (status)
3257                         goto out;
3258                 status = nfsd4_truncate(rqstp, current_fh, open);
3259                 if (status)
3260                         goto out;
3261                 stp = open->op_stp;
3262                 open->op_stp = NULL;
3263                 init_open_stateid(stp, fp, open);
3264         }
3265         update_stateid(&stp->st_stid.sc_stateid);
3266         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3267 
3268         if (nfsd4_has_session(&resp->cstate)) {
3269                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3270 
3271                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3272                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3273                         open->op_why_no_deleg = WND4_NOT_WANTED;
3274                         goto nodeleg;
3275                 }
3276         }
3277 
3278         /*
3279         * Attempt to hand out a delegation. No error return, because the
3280         * OPEN succeeds even if we fail.
3281         */
3282         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3283 nodeleg:
3284         status = nfs_ok;
3285 
3286         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3287                 STATEID_VAL(&stp->st_stid.sc_stateid));
3288 out:
3289         /* 4.1 client trying to upgrade/downgrade delegation? */
3290         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3291             open->op_deleg_want)
3292                 nfsd4_deleg_xgrade_none_ext(open, dp);
3293 
3294         if (fp)
3295                 put_nfs4_file(fp);
3296         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3297                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3298         /*
3299         * To finish the open response, we just need to set the rflags.
3300         */
3301         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3302         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3303             !nfsd4_has_session(&resp->cstate))
3304                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3305 
3306         return status;
3307 }
3308 
3309 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3310 {
3311         if (open->op_openowner) {
3312                 struct nfs4_openowner *oo = open->op_openowner;
3313 
3314                 if (!list_empty(&oo->oo_owner.so_stateids))
3315                         list_del_init(&oo->oo_close_lru);
3316                 if (oo->oo_flags & NFS4_OO_NEW) {
3317                         if (status) {
3318                                 release_openowner(oo);
3319                                 open->op_openowner = NULL;
3320                         } else
3321                                 oo->oo_flags &= ~NFS4_OO_NEW;
3322                 }
3323         }
3324         if (open->op_file)
3325                 nfsd4_free_file(open->op_file);
3326         if (open->op_stp)
3327                 free_generic_stateid(open->op_stp);
3328 }
3329 
3330 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3331 {
3332         struct nfs4_client *found;
3333 
3334         if (STALE_CLIENTID(clid, nn))
3335                 return nfserr_stale_clientid;
3336         found = find_confirmed_client(clid, session, nn);
3337         if (clp)
3338                 *clp = found;
3339         return found ? nfs_ok : nfserr_expired;
3340 }
3341 
3342 __be32
3343 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3344             clientid_t *clid)
3345 {
3346         struct nfs4_client *clp;
3347         __be32 status;
3348         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3349 
3350         nfs4_lock_state();
3351         dprintk("process_renew(%08x/%08x): starting\n", 
3352                         clid->cl_boot, clid->cl_id);
3353         status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3354         if (status)
3355                 goto out;
3356         status = nfserr_cb_path_down;
3357         if (!list_empty(&clp->cl_delegations)
3358                         && clp->cl_cb_state != NFSD4_CB_UP)
3359                 goto out;
3360         status = nfs_ok;
3361 out:
3362         nfs4_unlock_state();
3363         return status;
3364 }
3365 
3366 static void
3367 nfsd4_end_grace(struct nfsd_net *nn)
3368 {
3369         /* do nothing if grace period already ended */
3370         if (nn->grace_ended)
3371                 return;
3372 
3373         dprintk("NFSD: end of grace period\n");
3374         nn->grace_ended = true;
3375         nfsd4_record_grace_done(nn, nn->boot_time);
3376         locks_end_grace(&nn->nfsd4_manager);
3377         /*
3378          * Now that every NFSv4 client has had the chance to recover and
3379          * to see the (possibly new, possibly shorter) lease time, we
3380          * can safely set the next grace time to the current lease time:
3381          */
3382         nn->nfsd4_grace = nn->nfsd4_lease;
3383 }
3384 
3385 static time_t
3386 nfs4_laundromat(struct nfsd_net *nn)
3387 {
3388         struct nfs4_client *clp;
3389         struct nfs4_openowner *oo;
3390         struct nfs4_delegation *dp;
3391         struct list_head *pos, *next, reaplist;
3392         time_t cutoff = get_seconds() - nn->nfsd4_lease;
3393         time_t t, clientid_val = nn->nfsd4_lease;
3394         time_t u, test_val = nn->nfsd4_lease;
3395 
3396         nfs4_lock_state();
3397 
3398         dprintk("NFSD: laundromat service - starting\n");
3399         nfsd4_end_grace(nn);
3400         INIT_LIST_HEAD(&reaplist);
3401         spin_lock(&nn->client_lock);
3402         list_for_each_safe(pos, next, &nn->client_lru) {
3403                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3404                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3405                         t = clp->cl_time - cutoff;
3406                         if (clientid_val > t)
3407                                 clientid_val = t;
3408                         break;
3409                 }
3410                 if (mark_client_expired_locked(clp)) {
3411                         dprintk("NFSD: client in use (clientid %08x)\n",
3412                                 clp->cl_clientid.cl_id);
3413                         continue;
3414                 }
3415                 list_move(&clp->cl_lru, &reaplist);
3416         }
3417         spin_unlock(&nn->client_lock);
3418         list_for_each_safe(pos, next, &reaplist) {
3419                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3420                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3421                         clp->cl_clientid.cl_id);
3422                 expire_client(clp);
3423         }
3424         spin_lock(&recall_lock);
3425         list_for_each_safe(pos, next, &nn->del_recall_lru) {
3426                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3427                 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3428                         continue;
3429                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3430                         u = dp->dl_time - cutoff;
3431                         if (test_val > u)
3432                                 test_val = u;
3433                         break;
3434                 }
3435                 list_move(&dp->dl_recall_lru, &reaplist);
3436         }
3437         spin_unlock(&recall_lock);
3438         list_for_each_safe(pos, next, &reaplist) {
3439                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3440                 revoke_delegation(dp);
3441         }
3442         test_val = nn->nfsd4_lease;
3443         list_for_each_safe(pos, next, &nn->close_lru) {
3444                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3445                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3446                         u = oo->oo_time - cutoff;
3447                         if (test_val > u)
3448                                 test_val = u;
3449                         break;
3450                 }
3451                 release_openowner(oo);
3452         }
3453         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3454                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3455         nfs4_unlock_state();
3456         return clientid_val;
3457 }
3458 
3459 static struct workqueue_struct *laundry_wq;
3460 static void laundromat_main(struct work_struct *);
3461 
3462 static void
3463 laundromat_main(struct work_struct *laundry)
3464 {
3465         time_t t;
3466         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3467                                                   work);
3468         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3469                                            laundromat_work);
3470 
3471         t = nfs4_laundromat(nn);
3472         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3473         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3474 }
3475 
3476 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3477 {
3478         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3479                 return nfserr_bad_stateid;
3480         return nfs_ok;
3481 }
3482 
3483 static inline int
3484 access_permit_read(struct nfs4_ol_stateid *stp)
3485 {
3486         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3487                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3488                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3489 }
3490 
3491 static inline int
3492 access_permit_write(struct nfs4_ol_stateid *stp)
3493 {
3494         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3495                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3496 }
3497 
3498 static
3499 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3500 {
3501         __be32 status = nfserr_openmode;
3502 
3503         /* For lock stateid's, we test the parent open, not the lock: */
3504         if (stp->st_openstp)
3505                 stp = stp->st_openstp;
3506         if ((flags & WR_STATE) && !access_permit_write(stp))
3507                 goto out;
3508         if ((flags & RD_STATE) && !access_permit_read(stp))
3509                 goto out;
3510         status = nfs_ok;
3511 out:
3512         return status;
3513 }
3514 
3515 static inline __be32
3516 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3517 {
3518         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3519                 return nfs_ok;
3520         else if (locks_in_grace(net)) {
3521                 /* Answer in remaining cases depends on existence of
3522                  * conflicting state; so we must wait out the grace period. */
3523                 return nfserr_grace;
3524         } else if (flags & WR_STATE)
3525                 return nfs4_share_conflict(current_fh,
3526                                 NFS4_SHARE_DENY_WRITE);
3527         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3528                 return nfs4_share_conflict(current_fh,
3529                                 NFS4_SHARE_DENY_READ);
3530 }
3531 
3532 /*
3533  * Allow READ/WRITE during grace period on recovered state only for files
3534  * that are not able to provide mandatory locking.
3535  */
3536 static inline int
3537 grace_disallows_io(struct net *net, struct inode *inode)
3538 {
3539         return locks_in_grace(net) && mandatory_lock(inode);
3540 }
3541 
3542 /* Returns true iff a is later than b: */
3543 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3544 {
3545         return (s32)(a->si_generation - b->si_generation) > 0;
3546 }
3547 
3548 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3549 {
3550         /*
3551          * When sessions are used the stateid generation number is ignored
3552          * when it is zero.
3553          */
3554         if (has_session && in->si_generation == 0)
3555                 return nfs_ok;
3556 
3557         if (in->si_generation == ref->si_generation)
3558                 return nfs_ok;
3559 
3560         /* If the client sends us a stateid from the future, it's buggy: */
3561         if (stateid_generation_after(in, ref))
3562                 return nfserr_bad_stateid;
3563         /*
3564          * However, we could see a stateid from the past, even from a
3565          * non-buggy client.  For example, if the client sends a lock
3566          * while some IO is outstanding, the lock may bump si_generation
3567          * while the IO is still in flight.  The client could avoid that
3568          * situation by waiting for responses on all the IO requests,
3569          * but better performance may result in retrying IO that
3570          * receives an old_stateid error if requests are rarely
3571          * reordered in flight:
3572          */
3573         return nfserr_old_stateid;
3574 }
3575 
3576 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3577 {
3578         struct nfs4_stid *s;
3579         struct nfs4_ol_stateid *ols;
3580         __be32 status;
3581 
3582         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3583                 return nfserr_bad_stateid;
3584         /* Client debugging aid. */
3585         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3586                 char addr_str[INET6_ADDRSTRLEN];
3587                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3588                                  sizeof(addr_str));
3589                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3590                                         "with incorrect client ID\n", addr_str);
3591                 return nfserr_bad_stateid;
3592         }
3593         s = find_stateid(cl, stateid);
3594         if (!s)
3595                 return nfserr_bad_stateid;
3596         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3597         if (status)
3598                 return status;
3599         switch (s->sc_type) {
3600         case NFS4_DELEG_STID:
3601                 return nfs_ok;
3602         case NFS4_REVOKED_DELEG_STID:
3603                 return nfserr_deleg_revoked;
3604         case NFS4_OPEN_STID:
3605         case NFS4_LOCK_STID:
3606                 ols = openlockstateid(s);
3607                 if (ols->st_stateowner->so_is_open_owner
3608                                 && !(openowner(ols->st_stateowner)->oo_flags
3609                                                 & NFS4_OO_CONFIRMED))
3610                         return nfserr_bad_stateid;
3611                 return nfs_ok;
3612         default:
3613                 printk("unknown stateid type %x\n", s->sc_type);
3614         case NFS4_CLOSED_STID:
3615                 return nfserr_bad_stateid;
3616         }
3617 }
3618 
3619 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3620                                    struct nfs4_stid **s, bool sessions,
3621                                    struct nfsd_net *nn)
3622 {
3623         struct nfs4_client *cl;
3624         __be32 status;
3625 
3626         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3627                 return nfserr_bad_stateid;
3628         status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3629                                                         nn, &cl);
3630         if (status == nfserr_stale_clientid)
3631                 return nfserr_stale_stateid;
3632         if (status)
3633                 return status;
3634         *s = find_stateid_by_type(cl, stateid, typemask);
3635         if (!*s)
3636                 return nfserr_bad_stateid;
3637         return nfs_ok;
3638 }
3639 
3640 /*
3641 * Checks for stateid operations
3642 */
3643 __be32
3644 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3645                            stateid_t *stateid, int flags, struct file **filpp)
3646 {
3647         struct nfs4_stid *s;
3648         struct nfs4_ol_stateid *stp = NULL;
3649         struct nfs4_delegation *dp = NULL;
3650         struct svc_fh *current_fh = &cstate->current_fh;
3651         struct inode *ino = current_fh->fh_dentry->d_inode;
3652         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3653         __be32 status;
3654 
3655         if (filpp)
3656                 *filpp = NULL;
3657 
3658         if (grace_disallows_io(net, ino))
3659                 return nfserr_grace;
3660 
3661         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3662                 return check_special_stateids(net, current_fh, stateid, flags);
3663 
3664         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3665                                       &s, cstate->minorversion, nn);
3666         if (status)
3667                 return status;
3668         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3669         if (status)
3670                 goto out;
3671         switch (s->sc_type) {
3672         case NFS4_DELEG_STID:
3673                 dp = delegstateid(s);
3674                 status = nfs4_check_delegmode(dp, flags);
3675                 if (status)
3676                         goto out;
3677                 if (filpp) {
3678                         *filpp = dp->dl_file->fi_deleg_file;
3679                         if (!*filpp) {
3680                                 WARN_ON_ONCE(1);
3681                                 status = nfserr_serverfault;
3682                                 goto out;
3683                         }
3684                 }
3685                 break;
3686         case NFS4_OPEN_STID:
3687         case NFS4_LOCK_STID:
3688                 stp = openlockstateid(s);
3689                 status = nfs4_check_fh(current_fh, stp);
3690                 if (status)
3691                         goto out;
3692                 if (stp->st_stateowner->so_is_open_owner
3693                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3694                         goto out;
3695                 status = nfs4_check_openmode(stp, flags);
3696                 if (status)
3697                         goto out;
3698                 if (filpp) {
3699                         if (flags & RD_STATE)
3700                                 *filpp = find_readable_file(stp->st_file);
3701                         else
3702                                 *filpp = find_writeable_file(stp->st_file);
3703                 }
3704                 break;
3705         default:
3706                 return nfserr_bad_stateid;
3707         }
3708         status = nfs_ok;
3709 out:
3710         return status;
3711 }
3712 
3713 static __be32
3714 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3715 {
3716         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
3717 
3718         if (check_for_locks(stp->st_file, lo))
3719                 return nfserr_locks_held;
3720         /*
3721          * Currently there's a 1-1 lock stateid<->lockowner
3722          * correspondance, and we have to delete the lockowner when we
3723          * delete the lock stateid:
3724          */
3725         release_lockowner(lo);
3726         return nfs_ok;
3727 }
3728 
3729 /*
3730  * Test if the stateid is valid
3731  */
3732 __be32
3733 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3734                    struct nfsd4_test_stateid *test_stateid)
3735 {
3736         struct nfsd4_test_stateid_id *stateid;
3737         struct nfs4_client *cl = cstate->session->se_client;
3738 
3739         nfs4_lock_state();
3740         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3741                 stateid->ts_id_status =
3742                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3743         nfs4_unlock_state();
3744 
3745         return nfs_ok;
3746 }
3747 
3748 __be32
3749 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3750                    struct nfsd4_free_stateid *free_stateid)
3751 {
3752         stateid_t *stateid = &free_stateid->fr_stateid;
3753         struct nfs4_stid *s;
3754         struct nfs4_delegation *dp;
3755         struct nfs4_client *cl = cstate->session->se_client;
3756         __be32 ret = nfserr_bad_stateid;
3757 
3758         nfs4_lock_state();
3759         s = find_stateid(cl, stateid);
3760         if (!s)
3761                 goto out;
3762         switch (s->sc_type) {
3763         case NFS4_DELEG_STID:
3764                 ret = nfserr_locks_held;
3765                 goto out;
3766         case NFS4_OPEN_STID:
3767         case NFS4_LOCK_STID:
3768                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3769                 if (ret)
3770                         goto out;
3771                 if (s->sc_type == NFS4_LOCK_STID)
3772                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3773                 else
3774                         ret = nfserr_locks_held;
3775                 break;
3776         case NFS4_REVOKED_DELEG_STID:
3777                 dp = delegstateid(s);
3778                 destroy_revoked_delegation(dp);
3779                 ret = nfs_ok;
3780                 break;
3781         default:
3782                 ret = nfserr_bad_stateid;
3783         }
3784 out:
3785         nfs4_unlock_state();
3786         return ret;
3787 }
3788 
3789 static inline int
3790 setlkflg (int type)
3791 {
3792         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3793                 RD_STATE : WR_STATE;
3794 }
3795 
3796 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3797 {
3798         struct svc_fh *current_fh = &cstate->current_fh;
3799         struct nfs4_stateowner *sop = stp->st_stateowner;
3800         __be32 status;
3801 
3802         status = nfsd4_check_seqid(cstate, sop, seqid);
3803         if (status)
3804                 return status;
3805         if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3806                 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3807                 /*
3808                  * "Closed" stateid's exist *only* to return
3809                  * nfserr_replay_me from the previous step, and
3810                  * revoked delegations are kept only for free_stateid.
3811                  */
3812                 return nfserr_bad_stateid;
3813         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3814         if (status)
3815                 return status;
3816         return nfs4_check_fh(current_fh, stp);
3817 }
3818 
3819 /* 
3820  * Checks for sequence id mutating operations. 
3821  */
3822 static __be32
3823 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3824                          stateid_t *stateid, char typemask,
3825                          struct nfs4_ol_stateid **stpp,
3826                          struct nfsd_net *nn)
3827 {
3828         __be32 status;
3829         struct nfs4_stid *s;
3830 
3831         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3832                 seqid, STATEID_VAL(stateid));
3833 
3834         *stpp = NULL;
3835         status = nfsd4_lookup_stateid(stateid, typemask, &s,
3836                                       cstate->minorversion, nn);
3837         if (status)
3838                 return status;
3839         *stpp = openlockstateid(s);
3840         if (!nfsd4_has_session(cstate))
3841                 cstate->replay_owner = (*stpp)->st_stateowner;
3842 
3843         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3844 }
3845 
3846 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3847                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3848 {
3849         __be32 status;
3850         struct nfs4_openowner *oo;
3851 
3852         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3853                                                 NFS4_OPEN_STID, stpp, nn);
3854         if (status)
3855                 return status;
3856         oo = openowner((*stpp)->st_stateowner);
3857         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3858                 return nfserr_bad_stateid;
3859         return nfs_ok;
3860 }
3861 
3862 __be32
3863 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3864                    struct nfsd4_open_confirm *oc)
3865 {
3866         __be32 status;
3867         struct nfs4_openowner *oo;
3868         struct nfs4_ol_stateid *stp;
3869         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3870 
3871         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
3872                         cstate->current_fh.fh_dentry);
3873 
3874         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3875         if (status)
3876                 return status;
3877 
3878         nfs4_lock_state();
3879 
3880         status = nfs4_preprocess_seqid_op(cstate,
3881                                         oc->oc_seqid, &oc->oc_req_stateid,
3882                                         NFS4_OPEN_STID, &stp, nn);
3883         if (status)
3884                 goto out;
3885         oo = openowner(stp->st_stateowner);
3886         status = nfserr_bad_stateid;
3887         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3888                 goto out;
3889         oo->oo_flags |= NFS4_OO_CONFIRMED;
3890         update_stateid(&stp->st_stid.sc_stateid);
3891         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3892         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3893                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3894 
3895         nfsd4_client_record_create(oo->oo_owner.so_client);
3896         status = nfs_ok;
3897 out:
3898         nfsd4_bump_seqid(cstate, status);
3899         if (!cstate->replay_owner)
3900                 nfs4_unlock_state();
3901         return status;
3902 }
3903 
3904 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3905 {
3906         if (!test_access(access, stp))
3907                 return;
3908         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3909         clear_access(access, stp);
3910 }
3911 
3912 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3913 {
3914         switch (to_access) {
3915         case NFS4_SHARE_ACCESS_READ:
3916                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3917                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3918                 break;
3919         case NFS4_SHARE_ACCESS_WRITE:
3920                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3921                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3922                 break;
3923         case NFS4_SHARE_ACCESS_BOTH:
3924                 break;
3925         default:
3926                 WARN_ON_ONCE(1);
3927         }
3928 }
3929 
3930 static void
3931 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3932 {
3933         int i;
3934         for (i = 0; i < 4; i++) {
3935                 if ((i & deny) != i)
3936                         clear_deny(i, stp);
3937         }
3938 }
3939 
3940 __be32
3941 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3942                      struct nfsd4_compound_state *cstate,
3943                      struct nfsd4_open_downgrade *od)
3944 {
3945         __be32 status;
3946         struct nfs4_ol_stateid *stp;
3947         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3948 
3949         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", 
3950                         cstate->current_fh.fh_dentry);
3951 
3952         /* We don't yet support WANT bits: */
3953         if (od->od_deleg_want)
3954                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3955                         od->od_deleg_want);
3956 
3957         nfs4_lock_state();
3958         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3959                                         &od->od_stateid, &stp, nn);
3960         if (status)
3961                 goto out; 
3962         status = nfserr_inval;
3963         if (!test_access(od->od_share_access, stp)) {
3964                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3965                         stp->st_access_bmap, od->od_share_access);
3966                 goto out;
3967         }
3968         if (!test_deny(od->od_share_deny, stp)) {
3969                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3970                         stp->st_deny_bmap, od->od_share_deny);
3971                 goto out;
3972         }
3973         nfs4_stateid_downgrade(stp, od->od_share_access);
3974 
3975         reset_union_bmap_deny(od->od_share_deny, stp);
3976 
3977         update_stateid(&stp->st_stid.sc_stateid);
3978         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3979         status = nfs_ok;
3980 out:
3981         nfsd4_bump_seqid(cstate, status);
3982         if (!cstate->replay_owner)
3983                 nfs4_unlock_state();
3984         return status;
3985 }
3986 
3987 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3988 {
3989         unhash_open_stateid(s);
3990         s->st_stid.sc_type = NFS4_CLOSED_STID;
3991 }
3992 
3993 /*
3994  * nfs4_unlock_state() called after encode
3995  */
3996 __be32
3997 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3998             struct nfsd4_close *close)
3999 {
4000         __be32 status;
4001         struct nfs4_openowner *oo;
4002         struct nfs4_ol_stateid *stp;
4003         struct net *net = SVC_NET(rqstp);
4004         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4005 
4006         dprintk("NFSD: nfsd4_close on file %pd\n", 
4007                         cstate->current_fh.fh_dentry);
4008 
4009         nfs4_lock_state();
4010         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4011                                         &close->cl_stateid,
4012                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
4013                                         &stp, nn);
4014         nfsd4_bump_seqid(cstate, status);
4015         if (status)
4016                 goto out; 
4017         oo = openowner(stp->st_stateowner);
4018         update_stateid(&stp->st_stid.sc_stateid);
4019         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4020 
4021         nfsd4_close_open_stateid(stp);
4022 
4023         if (cstate->minorversion)
4024                 free_generic_stateid(stp);
4025         else
4026                 oo->oo_last_closed_stid = stp;
4027 
4028         if (list_empty(&oo->oo_owner.so_stateids)) {
4029                 if (cstate->minorversion)
4030                         release_openowner(oo);
4031                 else {
4032                         /*
4033                          * In the 4.0 case we need to keep the owners around a
4034                          * little while to handle CLOSE replay.
4035                          */
4036                         move_to_close_lru(oo, SVC_NET(rqstp));
4037                 }
4038         }
4039 out:
4040         if (!cstate->replay_owner)
4041                 nfs4_unlock_state();
4042         return status;
4043 }
4044 
4045 __be32
4046 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4047                   struct nfsd4_delegreturn *dr)
4048 {
4049         struct nfs4_delegation *dp;
4050         stateid_t *stateid = &dr->dr_stateid;
4051         struct nfs4_stid *s;
4052         __be32 status;
4053         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4054 
4055         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4056                 return status;
4057 
4058         nfs4_lock_state();
4059         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
4060                                       cstate->minorversion, nn);
4061         if (status)
4062                 goto out;
4063         dp = delegstateid(s);
4064         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4065         if (status)
4066                 goto out;
4067 
4068         destroy_delegation(dp);
4069 out:
4070         nfs4_unlock_state();
4071 
4072         return status;
4073 }
4074 
4075 
4076 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
4077 
4078 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
4079 
4080 static inline u64
4081 end_offset(u64 start, u64 len)
4082 {
4083         u64 end;
4084 
4085         end = start + len;
4086         return end >= start ? end: NFS4_MAX_UINT64;
4087 }
4088 
4089 /* last octet in a range */
4090 static inline u64
4091 last_byte_offset(u64 start, u64 len)
4092 {
4093         u64 end;
4094 
4095         WARN_ON_ONCE(!len);
4096         end = start + len;
4097         return end > start ? end - 1: NFS4_MAX_UINT64;
4098 }
4099 
4100 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4101 {
4102         return (file_hashval(inode) + cl_id
4103                         + opaque_hashval(ownername->data, ownername->len))
4104                 & LOCKOWNER_INO_HASH_MASK;
4105 }
4106 
4107 /*
4108  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4109  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4110  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
4111  * locking, this prevents us from being completely protocol-compliant.  The
4112  * real solution to this problem is to start using unsigned file offsets in
4113  * the VFS, but this is a very deep change!
4114  */
4115 static inline void
4116 nfs4_transform_lock_offset(struct file_lock *lock)
4117 {
4118         if (lock->fl_start < 0)
4119                 lock->fl_start = OFFSET_MAX;
4120         if (lock->fl_end < 0)
4121                 lock->fl_end = OFFSET_MAX;
4122 }
4123 
4124 /* Hack!: For now, we're defining this just so we can use a pointer to it
4125  * as a unique cookie to identify our (NFSv4's) posix locks. */
4126 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
4127 };
4128 
4129 static inline void
4130 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4131 {
4132         struct nfs4_lockowner *lo;
4133 
4134         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4135                 lo = (struct nfs4_lockowner *) fl->fl_owner;
4136                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4137                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
4138                 if (!deny->ld_owner.data)
4139                         /* We just don't care that much */
4140                         goto nevermind;
4141                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4142                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4143         } else {
4144 nevermind:
4145                 deny->ld_owner.len = 0;
4146                 deny->ld_owner.data = NULL;
4147                 deny->ld_clientid.cl_boot = 0;
4148                 deny->ld_clientid.cl_id = 0;
4149         }
4150         deny->ld_start = fl->fl_start;
4151         deny->ld_length = NFS4_MAX_UINT64;
4152         if (fl->fl_end != NFS4_MAX_UINT64)
4153                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
4154         deny->ld_type = NFS4_READ_LT;
4155         if (fl->fl_type != F_RDLCK)
4156                 deny->ld_type = NFS4_WRITE_LT;
4157 }
4158 
4159 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
4160 {
4161         struct nfs4_ol_stateid *lst;
4162 
4163         if (!same_owner_str(&lo->lo_owner, owner, clid))
4164                 return false;
4165         if (list_empty(&lo->lo_owner.so_stateids)) {
4166                 WARN_ON_ONCE(1);
4167                 return false;
4168         }
4169         lst = list_first_entry(&lo->lo_owner.so_stateids,
4170                                struct nfs4_ol_stateid, st_perstateowner);
4171         return lst->st_file->fi_inode == inode;
4172 }
4173 
4174 static struct nfs4_lockowner *
4175 find_lockowner_str(struct inode *inode, clientid_t *clid,
4176                    struct xdr_netobj *owner, struct nfsd_net *nn)
4177 {
4178         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4179         struct nfs4_lockowner *lo;
4180 
4181         list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4182                 if (same_lockowner_ino(lo, inode, clid, owner))
4183                         return lo;
4184         }
4185         return NULL;
4186 }
4187 
4188 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4189 {
4190         struct inode *inode = open_stp->st_file->fi_inode;
4191         unsigned int inohash = lockowner_ino_hashval(inode,
4192                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4193         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4194 
4195         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4196         list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4197         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
4198 }
4199 
4200 /*
4201  * Alloc a lock owner structure.
4202  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
4203  * occurred. 
4204  *
4205  * strhashval = ownerstr_hashval
4206  */
4207 
4208 static struct nfs4_lockowner *
4209 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4210         struct nfs4_lockowner *lo;
4211 
4212         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4213         if (!lo)
4214                 return NULL;
4215         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4216         lo->lo_owner.so_is_open_owner = 0;
4217         /* It is the openowner seqid that will be incremented in encode in the
4218          * case of new lockowners; so increment the lock seqid manually: */
4219         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4220         hash_lockowner(lo, strhashval, clp, open_stp);
4221         return lo;
4222 }
4223 
4224 static struct nfs4_ol_stateid *
4225 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4226 {
4227         struct nfs4_ol_stateid *stp;
4228         struct nfs4_client *clp = lo->lo_owner.so_client;
4229 
4230         stp = nfs4_alloc_stateid(clp);
4231         if (stp == NULL)
4232                 return NULL;
4233         stp->st_stid.sc_type = NFS4_LOCK_STID;
4234         list_add(&stp->st_perfile, &fp->fi_stateids);
4235         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4236         stp->st_stateowner = &lo->lo_owner;
4237         get_nfs4_file(fp);
4238         stp->st_file = fp;
4239         stp->st_access_bmap = 0;
4240         stp->st_deny_bmap = open_stp->st_deny_bmap;
4241         stp->st_openstp = open_stp;
4242         return stp;
4243 }
4244 
4245 static int
4246 check_lock_length(u64 offset, u64 length)
4247 {
4248         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4249              LOFF_OVERFLOW(offset, length)));
4250 }
4251 
4252 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4253 {
4254         struct nfs4_file *fp = lock_stp->st_file;
4255         int oflag = nfs4_access_to_omode(access);
4256 
4257         if (test_access(access, lock_stp))
4258                 return;
4259         nfs4_file_get_access(fp, oflag);
4260         set_access(access, lock_stp);
4261 }
4262 
4263 static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
4264 {
4265         struct nfs4_file *fi = ost->st_file;
4266         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4267         struct nfs4_client *cl = oo->oo_owner.so_client;
4268         struct nfs4_lockowner *lo;
4269         unsigned int strhashval;
4270         struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4271 
4272         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4273                                 &lock->v.new.owner, nn);
4274         if (lo) {
4275                 if (!cstate->minorversion)
4276                         return nfserr_bad_seqid;
4277                 /* XXX: a lockowner always has exactly one stateid: */
4278                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4279                                 struct nfs4_ol_stateid, st_perstateowner);
4280                 return nfs_ok;
4281         }
4282         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4283                         &lock->v.new.owner);
4284         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4285         if (lo == NULL)
4286                 return nfserr_jukebox;
4287         *lst = alloc_init_lock_stateid(lo, fi, ost);
4288         if (*lst == NULL) {
4289                 release_lockowner(lo);
4290                 return nfserr_jukebox;
4291         }
4292         *new = true;
4293         return nfs_ok;
4294 }
4295 
4296 /*
4297  *  LOCK operation 
4298  */
4299 __be32
4300 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4301            struct nfsd4_lock *lock)
4302 {
4303         struct nfs4_openowner *open_sop = NULL;
4304         struct nfs4_lockowner *lock_sop = NULL;
4305         struct nfs4_ol_stateid *lock_stp;
4306         struct file *filp = NULL;
4307         struct file_lock *file_lock = NULL;
4308         struct file_lock *conflock = NULL;
4309         __be32 status = 0;
4310         bool new_state = false;
4311         int lkflg;
4312         int err;
4313         struct net *net = SVC_NET(rqstp);
4314         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4315 
4316         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4317                 (long long) lock->lk_offset,
4318                 (long long) lock->lk_length);
4319 
4320         if (check_lock_length(lock->lk_offset, lock->lk_length))
4321                  return nfserr_inval;
4322 
4323         if ((status = fh_verify(rqstp, &cstate->current_fh,
4324                                 S_IFREG, NFSD_MAY_LOCK))) {
4325                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4326                 return status;
4327         }
4328 
4329         nfs4_lock_state();
4330 
4331         if (lock->lk_is_new) {
4332                 struct nfs4_ol_stateid *open_stp = NULL;
4333 
4334                 if (nfsd4_has_session(cstate))
4335                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4336                         memcpy(&lock->v.new.clientid,
4337                                 &cstate->session->se_client->cl_clientid,
4338                                 sizeof(clientid_t));
4339 
4340                 status = nfserr_stale_clientid;
4341                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4342                         goto out;
4343 
4344                 /* validate and update open stateid and open seqid */
4345                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4346                                         lock->lk_new_open_seqid,
4347                                         &lock->lk_new_open_stateid,
4348                                         &open_stp, nn);
4349                 if (status)
4350                         goto out;
4351                 open_sop = openowner(open_stp->st_stateowner);
4352                 status = nfserr_bad_stateid;
4353                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4354                                                 &lock->v.new.clientid))
4355                         goto out;
4356                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4357                                                         &lock_stp, &new_state);
4358         } else
4359                 status = nfs4_preprocess_seqid_op(cstate,
4360                                        lock->lk_old_lock_seqid,
4361                                        &lock->lk_old_lock_stateid,
4362                                        NFS4_LOCK_STID, &lock_stp, nn);
4363         if (status)
4364                 goto out;
4365         lock_sop = lockowner(lock_stp->st_stateowner);
4366 
4367         lkflg = setlkflg(lock->lk_type);
4368         status = nfs4_check_openmode(lock_stp, lkflg);
4369         if (status)
4370                 goto out;
4371 
4372         status = nfserr_grace;
4373         if (locks_in_grace(net) && !lock->lk_reclaim)
4374                 goto out;
4375         status = nfserr_no_grace;
4376         if (!locks_in_grace(net) && lock->lk_reclaim)
4377                 goto out;
4378 
4379         file_lock = locks_alloc_lock();
4380         if (!file_lock) {
4381                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4382                 status = nfserr_jukebox;
4383                 goto out;
4384         }
4385 
4386         locks_init_lock(file_lock);
4387         switch (lock->lk_type) {
4388                 case NFS4_READ_LT:
4389                 case NFS4_READW_LT:
4390                         filp = find_readable_file(lock_stp->st_file);
4391                         if (filp)
4392                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4393                         file_lock->fl_type = F_RDLCK;
4394                         break;
4395                 case NFS4_WRITE_LT:
4396                 case NFS4_WRITEW_LT:
4397                         filp = find_writeable_file(lock_stp->st_file);
4398                         if (filp)
4399                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4400                         file_lock->fl_type = F_WRLCK;
4401                         break;
4402                 default:
4403                         status = nfserr_inval;
4404                 goto out;
4405         }
4406         if (!filp) {
4407                 status = nfserr_openmode;
4408                 goto out;
4409         }
4410         file_lock->fl_owner = (fl_owner_t)lock_sop;
4411         file_lock->fl_pid = current->tgid;
4412         file_lock->fl_file = filp;
4413         file_lock->fl_flags = FL_POSIX;
4414         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4415         file_lock->fl_start = lock->lk_offset;
4416         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4417         nfs4_transform_lock_offset(file_lock);
4418 
4419         conflock = locks_alloc_lock();
4420         if (!conflock) {
4421                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4422                 status = nfserr_jukebox;
4423                 goto out;
4424         }
4425 
4426         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4427         switch (-err) {
4428         case 0: /* success! */
4429                 update_stateid(&lock_stp->st_stid.sc_stateid);
4430                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid, 
4431                                 sizeof(stateid_t));
4432                 status = 0;
4433                 break;
4434         case (EAGAIN):          /* conflock holds conflicting lock */
4435                 status = nfserr_denied;
4436                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4437                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4438                 break;
4439         case (EDEADLK):
4440                 status = nfserr_deadlock;
4441                 break;
4442         default:
4443                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4444                 status = nfserrno(err);
4445                 break;
4446         }
4447 out:
4448         if (status && new_state)
4449                 release_lockowner(lock_sop);
4450         nfsd4_bump_seqid(cstate, status);
4451         if (!cstate->replay_owner)
4452                 nfs4_unlock_state();
4453         if (file_lock)
4454                 locks_free_lock(file_lock);
4455         if (conflock)
4456                 locks_free_lock(conflock);
4457         return status;
4458 }
4459 
4460 /*
4461  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4462  * so we do a temporary open here just to get an open file to pass to
4463  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4464  * inode operation.)
4465  */
4466 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4467 {
4468         struct file *file;
4469         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4470         if (!err) {
4471                 err = nfserrno(vfs_test_lock(file, lock));
4472                 nfsd_close(file);
4473         }
4474         return err;
4475 }
4476 
4477 /*
4478  * LOCKT operation
4479  */
4480 __be32
4481 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4482             struct nfsd4_lockt *lockt)
4483 {
4484         struct inode *inode;
4485         struct file_lock *file_lock = NULL;
4486         struct nfs4_lockowner *lo;
4487         __be32 status;
4488         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4489 
4490         if (locks_in_grace(SVC_NET(rqstp)))
4491                 return nfserr_grace;
4492 
4493         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4494                  return nfserr_inval;
4495 
4496         nfs4_lock_state();
4497 
4498         if (!nfsd4_has_session(cstate)) {
4499                 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4500                 if (status)
4501                         goto out;
4502         }
4503 
4504         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4505                 goto out;
4506 
4507         inode = cstate->current_fh.fh_dentry->d_inode;
4508         file_lock = locks_alloc_lock();
4509         if (!file_lock) {
4510                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4511                 status = nfserr_jukebox;
4512                 goto out;
4513         }
4514         locks_init_lock(file_lock);
4515         switch (lockt->lt_type) {
4516                 case NFS4_READ_LT:
4517                 case NFS4_READW_LT:
4518                         file_lock->fl_type = F_RDLCK;
4519                 break;
4520                 case NFS4_WRITE_LT:
4521                 case NFS4_WRITEW_LT:
4522                         file_lock->fl_type = F_WRLCK;
4523                 break;
4524                 default:
4525                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4526                         status = nfserr_inval;
4527                 goto out;
4528         }
4529 
4530         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4531         if (lo)
4532                 file_lock->fl_owner = (fl_owner_t)lo;
4533         file_lock->fl_pid = current->tgid;
4534         file_lock->fl_flags = FL_POSIX;
4535 
4536         file_lock->fl_start = lockt->lt_offset;
4537         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4538 
4539         nfs4_transform_lock_offset(file_lock);
4540 
4541         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4542         if (status)
4543                 goto out;
4544 
4545         if (file_lock->fl_type != F_UNLCK) {
4546                 status = nfserr_denied;
4547                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4548         }
4549 out:
4550         nfs4_unlock_state();
4551         if (file_lock)
4552                 locks_free_lock(file_lock);
4553         return status;
4554 }
4555 
4556 __be32
4557 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4558             struct nfsd4_locku *locku)
4559 {
4560         struct nfs4_ol_stateid *stp;
4561         struct file *filp = NULL;
4562         struct file_lock *file_lock = NULL;
4563         __be32 status;
4564         int err;
4565         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4566 
4567         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4568                 (long long) locku->lu_offset,
4569                 (long long) locku->lu_length);
4570 
4571         if (check_lock_length(locku->lu_offset, locku->lu_length))
4572                  return nfserr_inval;
4573 
4574         nfs4_lock_state();
4575                                                                                 
4576         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4577                                         &locku->lu_stateid, NFS4_LOCK_STID,
4578                                         &stp, nn);
4579         if (status)
4580                 goto out;
4581         filp = find_any_file(stp->st_file);
4582         if (!filp) {
4583                 status = nfserr_lock_range;
4584                 goto out;
4585         }
4586         file_lock = locks_alloc_lock();
4587         if (!file_lock) {
4588                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4589                 status = nfserr_jukebox;
4590                 goto out;
4591         }
4592         locks_init_lock(file_lock);
4593         file_lock->fl_type = F_UNLCK;
4594         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4595         file_lock->fl_pid = current->tgid;
4596         file_lock->fl_file = filp;
4597         file_lock->fl_flags = FL_POSIX;
4598         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4599         file_lock->fl_start = locku->lu_offset;
4600 
4601         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4602                                                 locku->lu_length);
4603         nfs4_transform_lock_offset(file_lock);
4604 
4605         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4606         if (err) {
4607                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4608                 goto out_nfserr;
4609         }
4610         update_stateid(&stp->st_stid.sc_stateid);
4611         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4612 
4613 out:
4614         nfsd4_bump_seqid(cstate, status);
4615         if (!cstate->replay_owner)
4616                 nfs4_unlock_state();
4617         if (file_lock)
4618                 locks_free_lock(file_lock);
4619         return status;
4620 
4621 out_nfserr:
4622         status = nfserrno(err);
4623         goto out;
4624 }
4625 
4626 /*
4627  * returns
4628  *      1: locks held by lockowner
4629  *      0: no locks held by lockowner
4630  */
4631 static int
4632 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4633 {
4634         struct file_lock **flpp;
4635         struct inode *inode = filp->fi_inode;
4636         int status = 0;
4637 
4638         spin_lock(&inode->i_lock);
4639         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4640                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4641                         status = 1;
4642                         goto out;
4643                 }
4644         }
4645 out:
4646         spin_unlock(&inode->i_lock);
4647         return status;
4648 }
4649 
4650 __be32
4651 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4652                         struct nfsd4_compound_state *cstate,
4653                         struct nfsd4_release_lockowner *rlockowner)
4654 {
4655         clientid_t *clid = &rlockowner->rl_clientid;
4656         struct nfs4_stateowner *sop;
4657         struct nfs4_lockowner *lo;
4658         struct nfs4_ol_stateid *stp;
4659         struct xdr_netobj *owner = &rlockowner->rl_owner;
4660         struct list_head matches;
4661         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4662         __be32 status;
4663         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4664 
4665         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4666                 clid->cl_boot, clid->cl_id);
4667 
4668         nfs4_lock_state();
4669 
4670         status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4671         if (status)
4672                 goto out;
4673 
4674         status = nfserr_locks_held;
4675         INIT_LIST_HEAD(&matches);
4676 
4677         list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4678                 if (sop->so_is_open_owner)
4679                         continue;
4680                 if (!same_owner_str(sop, owner, clid))
4681                         continue;
4682                 list_for_each_entry(stp, &sop->so_stateids,
4683                                 st_perstateowner) {
4684                         lo = lockowner(sop);
4685                         if (check_for_locks(stp->st_file, lo))
4686                                 goto out;
4687                         list_add(&lo->lo_list, &matches);
4688                 }
4689         }
4690         /* Clients probably won't expect us to return with some (but not all)
4691          * of the lockowner state released; so don't release any until all
4692          * have been checked. */
4693         status = nfs_ok;
4694         while (!list_empty(&matches)) {
4695                 lo = list_entry(matches.next, struct nfs4_lockowner,
4696                                                                 lo_list);
4697                 /* unhash_stateowner deletes so_perclient only
4698                  * for openowners. */
4699                 list_del(&lo->lo_list);
4700                 release_lockowner(lo);
4701         }
4702 out:
4703         nfs4_unlock_state();
4704         return status;
4705 }
4706 
4707 static inline struct nfs4_client_reclaim *
4708 alloc_reclaim(void)
4709 {
4710         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4711 }
4712 
4713 bool
4714 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4715 {
4716         struct nfs4_client_reclaim *crp;
4717 
4718         crp = nfsd4_find_reclaim_client(name, nn);
4719         return (crp && crp->cr_clp);
4720 }
4721 
4722 /*
4723  * failure => all reset bets are off, nfserr_no_grace...
4724  */
4725 struct nfs4_client_reclaim *
4726 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4727 {
4728         unsigned int strhashval;
4729         struct nfs4_client_reclaim *crp;
4730 
4731         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4732         crp = alloc_reclaim();
4733         if (crp) {
4734                 strhashval = clientstr_hashval(name);
4735                 INIT_LIST_HEAD(&crp->cr_strhash);
4736                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4737                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4738                 crp->cr_clp = NULL;
4739                 nn->reclaim_str_hashtbl_size++;
4740         }
4741         return crp;
4742 }
4743 
4744 void
4745 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4746 {
4747         list_del(&crp->cr_strhash);
4748         kfree(crp);
4749         nn->reclaim_str_hashtbl_size--;
4750 }
4751 
4752 void
4753 nfs4_release_reclaim(struct nfsd_net *nn)
4754 {
4755         struct nfs4_client_reclaim *crp = NULL;
4756         int i;
4757 
4758         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4759                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4760                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4761                                         struct nfs4_client_reclaim, cr_strhash);
4762                         nfs4_remove_reclaim_record(crp, nn);
4763                 }
4764         }
4765         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4766 }
4767 
4768 /*
4769  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4770 struct nfs4_client_reclaim *
4771 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4772 {
4773         unsigned int strhashval;
4774         struct nfs4_client_reclaim *crp = NULL;
4775 
4776         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4777 
4778         strhashval = clientstr_hashval(recdir);
4779         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4780                 if (same_name(crp->cr_recdir, recdir)) {
4781                         return crp;
4782                 }
4783         }
4784         return NULL;
4785 }
4786 
4787 /*
4788 * Called from OPEN. Look for clientid in reclaim list.
4789 */
4790 __be32
4791 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4792 {
4793         struct nfs4_client *clp;
4794 
4795         /* find clientid in conf_id_hashtbl */
4796         clp = find_confirmed_client(clid, sessions, nn);
4797         if (clp == NULL)
4798                 return nfserr_reclaim_bad;
4799 
4800         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4801 }
4802 
4803 #ifdef CONFIG_NFSD_FAULT_INJECTION
4804 
4805 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4806 {
4807         if (mark_client_expired(clp))
4808                 return 0;
4809         expire_client(clp);
4810         return 1;
4811 }
4812 
4813 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4814 {
4815         char buf[INET6_ADDRSTRLEN];
4816         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4817         printk(KERN_INFO "NFS Client: %s\n", buf);
4818         return 1;
4819 }
4820 
4821 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4822                              const char *type)
4823 {
4824         char buf[INET6_ADDRSTRLEN];
4825         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4826         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4827 }
4828 
4829 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4830 {
4831         struct nfs4_openowner *oop;
4832         struct nfs4_lockowner *lop, *lo_next;
4833         struct nfs4_ol_stateid *stp, *st_next;
4834         u64 count = 0;
4835 
4836         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4837                 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4838                         list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4839                                 if (func)
4840                                         func(lop);
4841                                 if (++count == max)
4842                                         return count;
4843                         }
4844                 }
4845         }
4846 
4847         return count;
4848 }
4849 
4850 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4851 {
4852         return nfsd_foreach_client_lock(clp, max, release_lockowner);
4853 }
4854 
4855 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4856 {
4857         u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4858         nfsd_print_count(clp, count, "locked files");
4859         return count;
4860 }
4861 
4862 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4863 {
4864         struct nfs4_openowner *oop, *next;
4865         u64 count = 0;
4866 
4867         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4868                 if (func)
4869                         func(oop);
4870                 if (++count == max)
4871                         break;
4872         }
4873 
4874         return count;
4875 }
4876 
4877 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4878 {
4879         return nfsd_foreach_client_open(clp, max, release_openowner);
4880 }
4881 
4882 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4883 {
4884         u64 count = nfsd_foreach_client_open(clp, max, NULL);
4885         nfsd_print_count(clp, count, "open files");
4886         return count;
4887 }
4888 
4889 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4890                                      struct list_head *victims)
4891 {
4892         struct nfs4_delegation *dp, *next;
4893         u64 count = 0;
4894 
4895         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4896                 if (victims)
4897                         list_move(&dp->dl_recall_lru, victims);
4898                 if (++count == max)
4899                         break;
4900         }
4901         return count;
4902 }
4903 
4904 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4905 {
4906         struct nfs4_delegation *dp, *next;
4907         LIST_HEAD(victims);
4908         u64 count;
4909 
4910         spin_lock(&recall_lock);
4911         count = nfsd_find_all_delegations(clp, max, &victims);
4912         spin_unlock(&recall_lock);
4913 
4914         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4915                 revoke_delegation(dp);
4916 
4917         return count;
4918 }
4919 
4920 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4921 {
4922         struct nfs4_delegation *dp, *next;
4923         LIST_HEAD(victims);
4924         u64 count;
4925 
4926         spin_lock(&recall_lock);
4927         count = nfsd_find_all_delegations(clp, max, &victims);
4928         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4929                 nfsd_break_one_deleg(dp);
4930         spin_unlock(&recall_lock);
4931 
4932         return count;
4933 }
4934 
4935 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4936 {
4937         u64 count = 0;
4938 
4939         spin_lock(&recall_lock);
4940         count = nfsd_find_all_delegations(clp, max, NULL);
4941         spin_unlock(&recall_lock);
4942 
4943         nfsd_print_count(clp, count, "delegations");
4944         return count;
4945 }
4946 
4947 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4948 {
4949         struct nfs4_client *clp, *next;
4950         u64 count = 0;
4951         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4952 
4953         if (!nfsd_netns_ready(nn))
4954                 return 0;
4955 
4956         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4957                 count += func(clp, max - count);
4958                 if ((max != 0) && (count >= max))
4959                         break;
4960         }
4961 
4962         return count;
4963 }
4964 
4965 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4966 {
4967         struct nfs4_client *clp;
4968         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4969 
4970         if (!nfsd_netns_ready(nn))
4971                 return NULL;
4972 
4973         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4974                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
4975                         return clp;
4976         }
4977         return NULL;
4978 }
4979 
4980 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4981 
4982 /* initialization to perform at module load time: */
4983 
4984 void
4985 nfs4_state_init(void)
4986 {
4987 }
4988 
4989 /*
4990  * Since the lifetime of a delegation isn't limited to that of an open, a
4991  * client may quite reasonably hang on to a delegation as long as it has
4992  * the inode cached.  This becomes an obvious problem the first time a
4993  * client's inode cache approaches the size of the server's total memory.
4994  *
4995  * For now we avoid this problem by imposing a hard limit on the number
4996  * of delegations, which varies according to the server's memory size.
4997  */
4998 static void
4999 set_max_delegations(void)
5000 {
5001         /*
5002          * Allow at most 4 delegations per megabyte of RAM.  Quick
5003          * estimates suggest that in the worst case (where every delegation
5004          * is for a different inode), a delegation could take about 1.5K,
5005          * giving a worst case usage of about 6% of memory.
5006          */
5007         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
5008 }
5009 
5010 static int nfs4_state_create_net(struct net *net)
5011 {
5012         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5013         int i;
5014 
5015         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5016                         CLIENT_HASH_SIZE, GFP_KERNEL);
5017         if (!nn->conf_id_hashtbl)
5018                 goto err;
5019         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5020                         CLIENT_HASH_SIZE, GFP_KERNEL);
5021         if (!nn->unconf_id_hashtbl)
5022                 goto err_unconf_id;
5023         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5024                         OWNER_HASH_SIZE, GFP_KERNEL);
5025         if (!nn->ownerstr_hashtbl)
5026                 goto err_ownerstr;
5027         nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
5028                         LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
5029         if (!nn->lockowner_ino_hashtbl)
5030                 goto err_lockowner_ino;
5031         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5032                         SESSION_HASH_SIZE, GFP_KERNEL);
5033         if (!nn->sessionid_hashtbl)
5034                 goto err_sessionid;
5035 
5036         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5037                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5038                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5039         }
5040         for (i = 0; i < OWNER_HASH_SIZE; i++)
5041                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5042         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
5043                 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
5044         for (i = 0; i < SESSION_HASH_SIZE; i++)
5045                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5046         nn->conf_name_tree = RB_ROOT;
5047         nn->unconf_name_tree = RB_ROOT;
5048         INIT_LIST_HEAD(&nn->client_lru);
5049         INIT_LIST_HEAD(&nn->close_lru);
5050         INIT_LIST_HEAD(&nn->del_recall_lru);
5051         spin_lock_init(&nn->client_lock);
5052 
5053         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
5054         get_net(net);
5055 
5056         return 0;
5057 
5058 err_sessionid:
5059         kfree(nn->lockowner_ino_hashtbl);
5060 err_lockowner_ino:
5061         kfree(nn->ownerstr_hashtbl);
5062 err_ownerstr:
5063         kfree(nn->unconf_id_hashtbl);
5064 err_unconf_id:
5065         kfree(nn->conf_id_hashtbl);
5066 err:
5067         return -ENOMEM;
5068 }
5069 
5070 static void
5071 nfs4_state_destroy_net(struct net *net)
5072 {
5073         int i;
5074         struct nfs4_client *clp = NULL;
5075         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5076 
5077         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5078                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
5079                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5080                         destroy_client(clp);
5081                 }
5082         }
5083 
5084         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5085                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5086                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5087                         destroy_client(clp);
5088                 }
5089         }
5090 
5091         kfree(nn->sessionid_hashtbl);
5092         kfree(nn->lockowner_ino_hashtbl);
5093         kfree(nn->ownerstr_hashtbl);
5094         kfree(nn->unconf_id_hashtbl);
5095         kfree(nn->conf_id_hashtbl);
5096         put_net(net);
5097 }
5098 
5099 int
5100 nfs4_state_start_net(struct net *net)
5101 {
5102         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5103         int ret;
5104 
5105         ret = nfs4_state_create_net(net);
5106         if (ret)
5107                 return ret;
5108         nfsd4_client_tracking_init(net);
5109         nn->boot_time = get_seconds();
5110         locks_start_grace(net, &nn->nfsd4_manager);
5111         nn->grace_ended = false;
5112         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5113                nn->nfsd4_grace, net);
5114         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5115         return 0;
5116 }
5117 
5118 /* initialization to perform when the nfsd service is started: */
5119 
5120 int
5121 nfs4_state_start(void)
5122 {
5123         int ret;
5124 
5125         ret = set_callback_cred();
5126         if (ret)
5127                 return -ENOMEM;
5128         laundry_wq = create_singlethread_workqueue("nfsd4");
5129         if (laundry_wq == NULL) {
5130                 ret = -ENOMEM;
5131                 goto out_recovery;
5132         }
5133         ret = nfsd4_create_callback_queue();
5134         if (ret)
5135                 goto out_free_laundry;
5136 
5137         set_max_delegations();
5138 
5139         return 0;
5140 
5141 out_free_laundry:
5142         destroy_workqueue(laundry_wq);
5143 out_recovery:
5144         return ret;
5145 }
5146 
5147 void
5148 nfs4_state_shutdown_net(struct net *net)
5149 {
5150         struct nfs4_delegation *dp = NULL;
5151         struct list_head *pos, *next, reaplist;
5152         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5153 
5154         cancel_delayed_work_sync(&nn->laundromat_work);
5155         locks_end_grace(&nn->nfsd4_manager);
5156 
5157         nfs4_lock_state();
5158         INIT_LIST_HEAD(&reaplist);
5159         spin_lock(&recall_lock);
5160         list_for_each_safe(pos, next, &nn->del_recall_lru) {
5161                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5162                 list_move(&dp->dl_recall_lru, &reaplist);
5163         }
5164         spin_unlock(&recall_lock);
5165         list_for_each_safe(pos, next, &reaplist) {
5166                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5167                 destroy_delegation(dp);
5168         }
5169 
5170         nfsd4_client_tracking_exit(net);
5171         nfs4_state_destroy_net(net);
5172         nfs4_unlock_state();
5173 }
5174 
5175 void
5176 nfs4_state_shutdown(void)
5177 {
5178         destroy_workqueue(laundry_wq);
5179         nfsd4_destroy_callback_queue();
5180 }
5181 
5182 static void
5183 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5184 {
5185         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5186                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5187 }
5188 
5189 static void
5190 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5191 {
5192         if (cstate->minorversion) {
5193                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5194                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5195         }
5196 }
5197 
5198 void
5199 clear_current_stateid(struct nfsd4_compound_state *cstate)
5200 {
5201         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5202 }
5203 
5204 /*
5205  * functions to set current state id
5206  */
5207 void
5208 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5209 {
5210         put_stateid(cstate, &odp->od_stateid);
5211 }
5212 
5213 void
5214 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5215 {
5216         put_stateid(cstate, &open->op_stateid);
5217 }
5218 
5219 void
5220 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5221 {
5222         put_stateid(cstate, &close->cl_stateid);
5223 }
5224 
5225 void
5226 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5227 {
5228         put_stateid(cstate, &lock->lk_resp_stateid);
5229 }
5230 
5231 /*
5232  * functions to consume current state id
5233  */
5234 
5235 void
5236 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5237 {
5238         get_stateid(cstate, &odp->od_stateid);
5239 }
5240 
5241 void
5242 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5243 {
5244         get_stateid(cstate, &drp->dr_stateid);
5245 }
5246 
5247 void
5248 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5249 {
5250         get_stateid(cstate, &fsp->fr_stateid);
5251 }
5252 
5253 void
5254 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5255 {
5256         get_stateid(cstate, &setattr->sa_stateid);
5257 }
5258 
5259 void
5260 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5261 {
5262         get_stateid(cstate, &close->cl_stateid);
5263 }
5264 
5265 void
5266 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5267 {
5268         get_stateid(cstate, &locku->lu_stateid);
5269 }
5270 
5271 void
5272 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5273 {
5274         get_stateid(cstate, &read->rd_stateid);
5275 }
5276 
5277 void
5278 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5279 {
5280         get_stateid(cstate, &write->wr_stateid);
5281 }
5282 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp