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TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs4proc.c

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  1 /*
  2  *  fs/nfs/nfs4proc.c
  3  *
  4  *  Client-side procedure declarations for NFSv4.
  5  *
  6  *  Copyright (c) 2002 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Kendrick Smith <kmsmith@umich.edu>
 10  *  Andy Adamson   <andros@umich.edu>
 11  *
 12  *  Redistribution and use in source and binary forms, with or without
 13  *  modification, are permitted provided that the following conditions
 14  *  are met:
 15  *
 16  *  1. Redistributions of source code must retain the above copyright
 17  *     notice, this list of conditions and the following disclaimer.
 18  *  2. Redistributions in binary form must reproduce the above copyright
 19  *     notice, this list of conditions and the following disclaimer in the
 20  *     documentation and/or other materials provided with the distribution.
 21  *  3. Neither the name of the University nor the names of its
 22  *     contributors may be used to endorse or promote products derived
 23  *     from this software without specific prior written permission.
 24  *
 25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 36  */
 37 
 38 #include <linux/mm.h>
 39 #include <linux/delay.h>
 40 #include <linux/errno.h>
 41 #include <linux/string.h>
 42 #include <linux/ratelimit.h>
 43 #include <linux/printk.h>
 44 #include <linux/slab.h>
 45 #include <linux/sunrpc/clnt.h>
 46 #include <linux/nfs.h>
 47 #include <linux/nfs4.h>
 48 #include <linux/nfs_fs.h>
 49 #include <linux/nfs_page.h>
 50 #include <linux/nfs_mount.h>
 51 #include <linux/namei.h>
 52 #include <linux/mount.h>
 53 #include <linux/module.h>
 54 #include <linux/xattr.h>
 55 #include <linux/utsname.h>
 56 #include <linux/freezer.h>
 57 #include <linux/iversion.h>
 58 
 59 #include "nfs4_fs.h"
 60 #include "delegation.h"
 61 #include "internal.h"
 62 #include "iostat.h"
 63 #include "callback.h"
 64 #include "pnfs.h"
 65 #include "netns.h"
 66 #include "nfs4idmap.h"
 67 #include "nfs4session.h"
 68 #include "fscache.h"
 69 
 70 #include "nfs4trace.h"
 71 
 72 #define NFSDBG_FACILITY         NFSDBG_PROC
 73 
 74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
 75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
 76 
 77 /* file attributes which can be mapped to nfs attributes */
 78 #define NFS4_VALID_ATTRS (ATTR_MODE \
 79         | ATTR_UID \
 80         | ATTR_GID \
 81         | ATTR_SIZE \
 82         | ATTR_ATIME \
 83         | ATTR_MTIME \
 84         | ATTR_CTIME \
 85         | ATTR_ATIME_SET \
 86         | ATTR_MTIME_SET)
 87 
 88 struct nfs4_opendata;
 89 static int _nfs4_proc_open(struct nfs4_opendata *data);
 90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
 91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
 93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
 94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
 95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
 96                             struct nfs_fattr *fattr, struct iattr *sattr,
 97                             struct nfs_open_context *ctx, struct nfs4_label *ilabel,
 98                             struct nfs4_label *olabel);
 99 #ifdef CONFIG_NFS_V4_1
100 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
101                 struct rpc_cred *cred,
102                 struct nfs4_slot *slot,
103                 bool is_privileged);
104 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
105                 struct rpc_cred *);
106 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
107                 struct rpc_cred *, bool);
108 #endif
109 
110 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
111 static inline struct nfs4_label *
112 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
113         struct iattr *sattr, struct nfs4_label *label)
114 {
115         int err;
116 
117         if (label == NULL)
118                 return NULL;
119 
120         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
121                 return NULL;
122 
123         err = security_dentry_init_security(dentry, sattr->ia_mode,
124                                 &dentry->d_name, (void **)&label->label, &label->len);
125         if (err == 0)
126                 return label;
127 
128         return NULL;
129 }
130 static inline void
131 nfs4_label_release_security(struct nfs4_label *label)
132 {
133         if (label)
134                 security_release_secctx(label->label, label->len);
135 }
136 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
137 {
138         if (label)
139                 return server->attr_bitmask;
140 
141         return server->attr_bitmask_nl;
142 }
143 #else
144 static inline struct nfs4_label *
145 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
146         struct iattr *sattr, struct nfs4_label *l)
147 { return NULL; }
148 static inline void
149 nfs4_label_release_security(struct nfs4_label *label)
150 { return; }
151 static inline u32 *
152 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
153 { return server->attr_bitmask; }
154 #endif
155 
156 /* Prevent leaks of NFSv4 errors into userland */
157 static int nfs4_map_errors(int err)
158 {
159         if (err >= -1000)
160                 return err;
161         switch (err) {
162         case -NFS4ERR_RESOURCE:
163         case -NFS4ERR_LAYOUTTRYLATER:
164         case -NFS4ERR_RECALLCONFLICT:
165                 return -EREMOTEIO;
166         case -NFS4ERR_WRONGSEC:
167         case -NFS4ERR_WRONG_CRED:
168                 return -EPERM;
169         case -NFS4ERR_BADOWNER:
170         case -NFS4ERR_BADNAME:
171                 return -EINVAL;
172         case -NFS4ERR_SHARE_DENIED:
173                 return -EACCES;
174         case -NFS4ERR_MINOR_VERS_MISMATCH:
175                 return -EPROTONOSUPPORT;
176         case -NFS4ERR_FILE_OPEN:
177                 return -EBUSY;
178         default:
179                 dprintk("%s could not handle NFSv4 error %d\n",
180                                 __func__, -err);
181                 break;
182         }
183         return -EIO;
184 }
185 
186 /*
187  * This is our standard bitmap for GETATTR requests.
188  */
189 const u32 nfs4_fattr_bitmap[3] = {
190         FATTR4_WORD0_TYPE
191         | FATTR4_WORD0_CHANGE
192         | FATTR4_WORD0_SIZE
193         | FATTR4_WORD0_FSID
194         | FATTR4_WORD0_FILEID,
195         FATTR4_WORD1_MODE
196         | FATTR4_WORD1_NUMLINKS
197         | FATTR4_WORD1_OWNER
198         | FATTR4_WORD1_OWNER_GROUP
199         | FATTR4_WORD1_RAWDEV
200         | FATTR4_WORD1_SPACE_USED
201         | FATTR4_WORD1_TIME_ACCESS
202         | FATTR4_WORD1_TIME_METADATA
203         | FATTR4_WORD1_TIME_MODIFY
204         | FATTR4_WORD1_MOUNTED_ON_FILEID,
205 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
206         FATTR4_WORD2_SECURITY_LABEL
207 #endif
208 };
209 
210 static const u32 nfs4_pnfs_open_bitmap[3] = {
211         FATTR4_WORD0_TYPE
212         | FATTR4_WORD0_CHANGE
213         | FATTR4_WORD0_SIZE
214         | FATTR4_WORD0_FSID
215         | FATTR4_WORD0_FILEID,
216         FATTR4_WORD1_MODE
217         | FATTR4_WORD1_NUMLINKS
218         | FATTR4_WORD1_OWNER
219         | FATTR4_WORD1_OWNER_GROUP
220         | FATTR4_WORD1_RAWDEV
221         | FATTR4_WORD1_SPACE_USED
222         | FATTR4_WORD1_TIME_ACCESS
223         | FATTR4_WORD1_TIME_METADATA
224         | FATTR4_WORD1_TIME_MODIFY,
225         FATTR4_WORD2_MDSTHRESHOLD
226 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
227         | FATTR4_WORD2_SECURITY_LABEL
228 #endif
229 };
230 
231 static const u32 nfs4_open_noattr_bitmap[3] = {
232         FATTR4_WORD0_TYPE
233         | FATTR4_WORD0_FILEID,
234 };
235 
236 const u32 nfs4_statfs_bitmap[3] = {
237         FATTR4_WORD0_FILES_AVAIL
238         | FATTR4_WORD0_FILES_FREE
239         | FATTR4_WORD0_FILES_TOTAL,
240         FATTR4_WORD1_SPACE_AVAIL
241         | FATTR4_WORD1_SPACE_FREE
242         | FATTR4_WORD1_SPACE_TOTAL
243 };
244 
245 const u32 nfs4_pathconf_bitmap[3] = {
246         FATTR4_WORD0_MAXLINK
247         | FATTR4_WORD0_MAXNAME,
248         0
249 };
250 
251 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
252                         | FATTR4_WORD0_MAXREAD
253                         | FATTR4_WORD0_MAXWRITE
254                         | FATTR4_WORD0_LEASE_TIME,
255                         FATTR4_WORD1_TIME_DELTA
256                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
257                         FATTR4_WORD2_LAYOUT_BLKSIZE
258                         | FATTR4_WORD2_CLONE_BLKSIZE
259 };
260 
261 const u32 nfs4_fs_locations_bitmap[3] = {
262         FATTR4_WORD0_CHANGE
263         | FATTR4_WORD0_SIZE
264         | FATTR4_WORD0_FSID
265         | FATTR4_WORD0_FILEID
266         | FATTR4_WORD0_FS_LOCATIONS,
267         FATTR4_WORD1_OWNER
268         | FATTR4_WORD1_OWNER_GROUP
269         | FATTR4_WORD1_RAWDEV
270         | FATTR4_WORD1_SPACE_USED
271         | FATTR4_WORD1_TIME_ACCESS
272         | FATTR4_WORD1_TIME_METADATA
273         | FATTR4_WORD1_TIME_MODIFY
274         | FATTR4_WORD1_MOUNTED_ON_FILEID,
275 };
276 
277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
278                 struct nfs4_readdir_arg *readdir)
279 {
280         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
281         __be32 *start, *p;
282 
283         if (cookie > 2) {
284                 readdir->cookie = cookie;
285                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
286                 return;
287         }
288 
289         readdir->cookie = 0;
290         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
291         if (cookie == 2)
292                 return;
293         
294         /*
295          * NFSv4 servers do not return entries for '.' and '..'
296          * Therefore, we fake these entries here.  We let '.'
297          * have cookie 0 and '..' have cookie 1.  Note that
298          * when talking to the server, we always send cookie 0
299          * instead of 1 or 2.
300          */
301         start = p = kmap_atomic(*readdir->pages);
302         
303         if (cookie == 0) {
304                 *p++ = xdr_one;                                  /* next */
305                 *p++ = xdr_zero;                   /* cookie, first word */
306                 *p++ = xdr_one;                   /* cookie, second word */
307                 *p++ = xdr_one;                             /* entry len */
308                 memcpy(p, ".\0\0\0", 4);                        /* entry */
309                 p++;
310                 *p++ = xdr_one;                         /* bitmap length */
311                 *p++ = htonl(attrs);                           /* bitmap */
312                 *p++ = htonl(12);             /* attribute buffer length */
313                 *p++ = htonl(NF4DIR);
314                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
315         }
316         
317         *p++ = xdr_one;                                  /* next */
318         *p++ = xdr_zero;                   /* cookie, first word */
319         *p++ = xdr_two;                   /* cookie, second word */
320         *p++ = xdr_two;                             /* entry len */
321         memcpy(p, "..\0\0", 4);                         /* entry */
322         p++;
323         *p++ = xdr_one;                         /* bitmap length */
324         *p++ = htonl(attrs);                           /* bitmap */
325         *p++ = htonl(12);             /* attribute buffer length */
326         *p++ = htonl(NF4DIR);
327         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
328 
329         readdir->pgbase = (char *)p - (char *)start;
330         readdir->count -= readdir->pgbase;
331         kunmap_atomic(start);
332 }
333 
334 static void nfs4_test_and_free_stateid(struct nfs_server *server,
335                 nfs4_stateid *stateid,
336                 struct rpc_cred *cred)
337 {
338         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
339 
340         ops->test_and_free_expired(server, stateid, cred);
341 }
342 
343 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
344                 nfs4_stateid *stateid,
345                 struct rpc_cred *cred)
346 {
347         stateid->type = NFS4_REVOKED_STATEID_TYPE;
348         nfs4_test_and_free_stateid(server, stateid, cred);
349 }
350 
351 static void nfs4_free_revoked_stateid(struct nfs_server *server,
352                 const nfs4_stateid *stateid,
353                 struct rpc_cred *cred)
354 {
355         nfs4_stateid tmp;
356 
357         nfs4_stateid_copy(&tmp, stateid);
358         __nfs4_free_revoked_stateid(server, &tmp, cred);
359 }
360 
361 static long nfs4_update_delay(long *timeout)
362 {
363         long ret;
364         if (!timeout)
365                 return NFS4_POLL_RETRY_MAX;
366         if (*timeout <= 0)
367                 *timeout = NFS4_POLL_RETRY_MIN;
368         if (*timeout > NFS4_POLL_RETRY_MAX)
369                 *timeout = NFS4_POLL_RETRY_MAX;
370         ret = *timeout;
371         *timeout <<= 1;
372         return ret;
373 }
374 
375 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
376 {
377         int res = 0;
378 
379         might_sleep();
380 
381         freezable_schedule_timeout_killable_unsafe(
382                 nfs4_update_delay(timeout));
383         if (fatal_signal_pending(current))
384                 res = -ERESTARTSYS;
385         return res;
386 }
387 
388 /* This is the error handling routine for processes that are allowed
389  * to sleep.
390  */
391 static int nfs4_do_handle_exception(struct nfs_server *server,
392                 int errorcode, struct nfs4_exception *exception)
393 {
394         struct nfs_client *clp = server->nfs_client;
395         struct nfs4_state *state = exception->state;
396         const nfs4_stateid *stateid = exception->stateid;
397         struct inode *inode = exception->inode;
398         int ret = errorcode;
399 
400         exception->delay = 0;
401         exception->recovering = 0;
402         exception->retry = 0;
403 
404         if (stateid == NULL && state != NULL)
405                 stateid = &state->stateid;
406 
407         switch(errorcode) {
408                 case 0:
409                         return 0;
410                 case -NFS4ERR_DELEG_REVOKED:
411                 case -NFS4ERR_ADMIN_REVOKED:
412                 case -NFS4ERR_EXPIRED:
413                 case -NFS4ERR_BAD_STATEID:
414                         if (inode != NULL && stateid != NULL) {
415                                 nfs_inode_find_state_and_recover(inode,
416                                                 stateid);
417                                 goto wait_on_recovery;
418                         }
419                 case -NFS4ERR_OPENMODE:
420                         if (inode) {
421                                 int err;
422 
423                                 err = nfs_async_inode_return_delegation(inode,
424                                                 stateid);
425                                 if (err == 0)
426                                         goto wait_on_recovery;
427                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
428                                         exception->retry = 1;
429                                         break;
430                                 }
431                         }
432                         if (state == NULL)
433                                 break;
434                         ret = nfs4_schedule_stateid_recovery(server, state);
435                         if (ret < 0)
436                                 break;
437                         goto wait_on_recovery;
438                 case -NFS4ERR_STALE_STATEID:
439                 case -NFS4ERR_STALE_CLIENTID:
440                         nfs4_schedule_lease_recovery(clp);
441                         goto wait_on_recovery;
442                 case -NFS4ERR_MOVED:
443                         ret = nfs4_schedule_migration_recovery(server);
444                         if (ret < 0)
445                                 break;
446                         goto wait_on_recovery;
447                 case -NFS4ERR_LEASE_MOVED:
448                         nfs4_schedule_lease_moved_recovery(clp);
449                         goto wait_on_recovery;
450 #if defined(CONFIG_NFS_V4_1)
451                 case -NFS4ERR_BADSESSION:
452                 case -NFS4ERR_BADSLOT:
453                 case -NFS4ERR_BAD_HIGH_SLOT:
454                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
455                 case -NFS4ERR_DEADSESSION:
456                 case -NFS4ERR_SEQ_FALSE_RETRY:
457                 case -NFS4ERR_SEQ_MISORDERED:
458                         dprintk("%s ERROR: %d Reset session\n", __func__,
459                                 errorcode);
460                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
461                         goto wait_on_recovery;
462 #endif /* defined(CONFIG_NFS_V4_1) */
463                 case -NFS4ERR_FILE_OPEN:
464                         if (exception->timeout > HZ) {
465                                 /* We have retried a decent amount, time to
466                                  * fail
467                                  */
468                                 ret = -EBUSY;
469                                 break;
470                         }
471                 case -NFS4ERR_DELAY:
472                         nfs_inc_server_stats(server, NFSIOS_DELAY);
473                 case -NFS4ERR_GRACE:
474                 case -NFS4ERR_LAYOUTTRYLATER:
475                 case -NFS4ERR_RECALLCONFLICT:
476                         exception->delay = 1;
477                         return 0;
478 
479                 case -NFS4ERR_RETRY_UNCACHED_REP:
480                 case -NFS4ERR_OLD_STATEID:
481                         exception->retry = 1;
482                         break;
483                 case -NFS4ERR_BADOWNER:
484                         /* The following works around a Linux server bug! */
485                 case -NFS4ERR_BADNAME:
486                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
487                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
488                                 exception->retry = 1;
489                                 printk(KERN_WARNING "NFS: v4 server %s "
490                                                 "does not accept raw "
491                                                 "uid/gids. "
492                                                 "Reenabling the idmapper.\n",
493                                                 server->nfs_client->cl_hostname);
494                         }
495         }
496         /* We failed to handle the error */
497         return nfs4_map_errors(ret);
498 wait_on_recovery:
499         exception->recovering = 1;
500         return 0;
501 }
502 
503 /* This is the error handling routine for processes that are allowed
504  * to sleep.
505  */
506 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
507 {
508         struct nfs_client *clp = server->nfs_client;
509         int ret;
510 
511         ret = nfs4_do_handle_exception(server, errorcode, exception);
512         if (exception->delay) {
513                 ret = nfs4_delay(server->client, &exception->timeout);
514                 goto out_retry;
515         }
516         if (exception->recovering) {
517                 ret = nfs4_wait_clnt_recover(clp);
518                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
519                         return -EIO;
520                 goto out_retry;
521         }
522         return ret;
523 out_retry:
524         if (ret == 0)
525                 exception->retry = 1;
526         return ret;
527 }
528 
529 static int
530 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
531                 int errorcode, struct nfs4_exception *exception)
532 {
533         struct nfs_client *clp = server->nfs_client;
534         int ret;
535 
536         ret = nfs4_do_handle_exception(server, errorcode, exception);
537         if (exception->delay) {
538                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
539                 goto out_retry;
540         }
541         if (exception->recovering) {
542                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
543                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
544                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
545                 goto out_retry;
546         }
547         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
548                 ret = -EIO;
549         return ret;
550 out_retry:
551         if (ret == 0)
552                 exception->retry = 1;
553         return ret;
554 }
555 
556 static int
557 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
558                         struct nfs4_state *state, long *timeout)
559 {
560         struct nfs4_exception exception = {
561                 .state = state,
562         };
563 
564         if (task->tk_status >= 0)
565                 return 0;
566         if (timeout)
567                 exception.timeout = *timeout;
568         task->tk_status = nfs4_async_handle_exception(task, server,
569                         task->tk_status,
570                         &exception);
571         if (exception.delay && timeout)
572                 *timeout = exception.timeout;
573         if (exception.retry)
574                 return -EAGAIN;
575         return 0;
576 }
577 
578 /*
579  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
580  * or 'false' otherwise.
581  */
582 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
583 {
584         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
585         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
586 }
587 
588 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
589 {
590         spin_lock(&clp->cl_lock);
591         if (time_before(clp->cl_last_renewal,timestamp))
592                 clp->cl_last_renewal = timestamp;
593         spin_unlock(&clp->cl_lock);
594 }
595 
596 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
597 {
598         struct nfs_client *clp = server->nfs_client;
599 
600         if (!nfs4_has_session(clp))
601                 do_renew_lease(clp, timestamp);
602 }
603 
604 struct nfs4_call_sync_data {
605         const struct nfs_server *seq_server;
606         struct nfs4_sequence_args *seq_args;
607         struct nfs4_sequence_res *seq_res;
608 };
609 
610 void nfs4_init_sequence(struct nfs4_sequence_args *args,
611                         struct nfs4_sequence_res *res, int cache_reply)
612 {
613         args->sa_slot = NULL;
614         args->sa_cache_this = cache_reply;
615         args->sa_privileged = 0;
616 
617         res->sr_slot = NULL;
618 }
619 
620 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
621 {
622         args->sa_privileged = 1;
623 }
624 
625 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
626 {
627         struct nfs4_slot *slot = res->sr_slot;
628         struct nfs4_slot_table *tbl;
629 
630         tbl = slot->table;
631         spin_lock(&tbl->slot_tbl_lock);
632         if (!nfs41_wake_and_assign_slot(tbl, slot))
633                 nfs4_free_slot(tbl, slot);
634         spin_unlock(&tbl->slot_tbl_lock);
635 
636         res->sr_slot = NULL;
637 }
638 
639 static int nfs40_sequence_done(struct rpc_task *task,
640                                struct nfs4_sequence_res *res)
641 {
642         if (res->sr_slot != NULL)
643                 nfs40_sequence_free_slot(res);
644         return 1;
645 }
646 
647 #if defined(CONFIG_NFS_V4_1)
648 
649 static void nfs41_release_slot(struct nfs4_slot *slot)
650 {
651         struct nfs4_session *session;
652         struct nfs4_slot_table *tbl;
653         bool send_new_highest_used_slotid = false;
654 
655         if (!slot)
656                 return;
657         tbl = slot->table;
658         session = tbl->session;
659 
660         /* Bump the slot sequence number */
661         if (slot->seq_done)
662                 slot->seq_nr++;
663         slot->seq_done = 0;
664 
665         spin_lock(&tbl->slot_tbl_lock);
666         /* Be nice to the server: try to ensure that the last transmitted
667          * value for highest_user_slotid <= target_highest_slotid
668          */
669         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
670                 send_new_highest_used_slotid = true;
671 
672         if (nfs41_wake_and_assign_slot(tbl, slot)) {
673                 send_new_highest_used_slotid = false;
674                 goto out_unlock;
675         }
676         nfs4_free_slot(tbl, slot);
677 
678         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
679                 send_new_highest_used_slotid = false;
680 out_unlock:
681         spin_unlock(&tbl->slot_tbl_lock);
682         if (send_new_highest_used_slotid)
683                 nfs41_notify_server(session->clp);
684         if (waitqueue_active(&tbl->slot_waitq))
685                 wake_up_all(&tbl->slot_waitq);
686 }
687 
688 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
689 {
690         nfs41_release_slot(res->sr_slot);
691         res->sr_slot = NULL;
692 }
693 
694 static int nfs41_sequence_process(struct rpc_task *task,
695                 struct nfs4_sequence_res *res)
696 {
697         struct nfs4_session *session;
698         struct nfs4_slot *slot = res->sr_slot;
699         struct nfs_client *clp;
700         bool interrupted = false;
701         int ret = 1;
702 
703         if (slot == NULL)
704                 goto out_noaction;
705         /* don't increment the sequence number if the task wasn't sent */
706         if (!RPC_WAS_SENT(task))
707                 goto out;
708 
709         session = slot->table->session;
710 
711         if (slot->interrupted) {
712                 if (res->sr_status != -NFS4ERR_DELAY)
713                         slot->interrupted = 0;
714                 interrupted = true;
715         }
716 
717         trace_nfs4_sequence_done(session, res);
718         /* Check the SEQUENCE operation status */
719         switch (res->sr_status) {
720         case 0:
721                 /* Update the slot's sequence and clientid lease timer */
722                 slot->seq_done = 1;
723                 clp = session->clp;
724                 do_renew_lease(clp, res->sr_timestamp);
725                 /* Check sequence flags */
726                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
727                                 !!slot->privileged);
728                 nfs41_update_target_slotid(slot->table, slot, res);
729                 break;
730         case 1:
731                 /*
732                  * sr_status remains 1 if an RPC level error occurred.
733                  * The server may or may not have processed the sequence
734                  * operation..
735                  * Mark the slot as having hosted an interrupted RPC call.
736                  */
737                 slot->interrupted = 1;
738                 goto out;
739         case -NFS4ERR_DELAY:
740                 /* The server detected a resend of the RPC call and
741                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
742                  * of RFC5661.
743                  */
744                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
745                         __func__,
746                         slot->slot_nr,
747                         slot->seq_nr);
748                 goto out_retry;
749         case -NFS4ERR_BADSLOT:
750                 /*
751                  * The slot id we used was probably retired. Try again
752                  * using a different slot id.
753                  */
754                 if (slot->seq_nr < slot->table->target_highest_slotid)
755                         goto session_recover;
756                 goto retry_nowait;
757         case -NFS4ERR_SEQ_MISORDERED:
758                 /*
759                  * Was the last operation on this sequence interrupted?
760                  * If so, retry after bumping the sequence number.
761                  */
762                 if (interrupted)
763                         goto retry_new_seq;
764                 /*
765                  * Could this slot have been previously retired?
766                  * If so, then the server may be expecting seq_nr = 1!
767                  */
768                 if (slot->seq_nr != 1) {
769                         slot->seq_nr = 1;
770                         goto retry_nowait;
771                 }
772                 goto session_recover;
773         case -NFS4ERR_SEQ_FALSE_RETRY:
774                 if (interrupted)
775                         goto retry_new_seq;
776                 goto session_recover;
777         default:
778                 /* Just update the slot sequence no. */
779                 slot->seq_done = 1;
780         }
781 out:
782         /* The session may be reset by one of the error handlers. */
783         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
784 out_noaction:
785         return ret;
786 session_recover:
787         nfs4_schedule_session_recovery(session, res->sr_status);
788         goto retry_nowait;
789 retry_new_seq:
790         ++slot->seq_nr;
791 retry_nowait:
792         if (rpc_restart_call_prepare(task)) {
793                 nfs41_sequence_free_slot(res);
794                 task->tk_status = 0;
795                 ret = 0;
796         }
797         goto out;
798 out_retry:
799         if (!rpc_restart_call(task))
800                 goto out;
801         rpc_delay(task, NFS4_POLL_RETRY_MAX);
802         return 0;
803 }
804 
805 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
806 {
807         if (!nfs41_sequence_process(task, res))
808                 return 0;
809         if (res->sr_slot != NULL)
810                 nfs41_sequence_free_slot(res);
811         return 1;
812 
813 }
814 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
815 
816 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
817 {
818         if (res->sr_slot == NULL)
819                 return 1;
820         if (res->sr_slot->table->session != NULL)
821                 return nfs41_sequence_process(task, res);
822         return nfs40_sequence_done(task, res);
823 }
824 
825 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
826 {
827         if (res->sr_slot != NULL) {
828                 if (res->sr_slot->table->session != NULL)
829                         nfs41_sequence_free_slot(res);
830                 else
831                         nfs40_sequence_free_slot(res);
832         }
833 }
834 
835 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
836 {
837         if (res->sr_slot == NULL)
838                 return 1;
839         if (!res->sr_slot->table->session)
840                 return nfs40_sequence_done(task, res);
841         return nfs41_sequence_done(task, res);
842 }
843 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
844 
845 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
846 {
847         struct nfs4_call_sync_data *data = calldata;
848 
849         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
850 
851         nfs4_setup_sequence(data->seq_server->nfs_client,
852                             data->seq_args, data->seq_res, task);
853 }
854 
855 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
856 {
857         struct nfs4_call_sync_data *data = calldata;
858 
859         nfs41_sequence_done(task, data->seq_res);
860 }
861 
862 static const struct rpc_call_ops nfs41_call_sync_ops = {
863         .rpc_call_prepare = nfs41_call_sync_prepare,
864         .rpc_call_done = nfs41_call_sync_done,
865 };
866 
867 static void
868 nfs4_sequence_process_interrupted(struct nfs_client *client,
869                 struct nfs4_slot *slot, struct rpc_cred *cred)
870 {
871         struct rpc_task *task;
872 
873         task = _nfs41_proc_sequence(client, cred, slot, true);
874         if (!IS_ERR(task))
875                 rpc_put_task_async(task);
876 }
877 
878 #else   /* !CONFIG_NFS_V4_1 */
879 
880 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
881 {
882         return nfs40_sequence_done(task, res);
883 }
884 
885 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
886 {
887         if (res->sr_slot != NULL)
888                 nfs40_sequence_free_slot(res);
889 }
890 
891 int nfs4_sequence_done(struct rpc_task *task,
892                        struct nfs4_sequence_res *res)
893 {
894         return nfs40_sequence_done(task, res);
895 }
896 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
897 
898 static void
899 nfs4_sequence_process_interrupted(struct nfs_client *client,
900                 struct nfs4_slot *slot, struct rpc_cred *cred)
901 {
902         WARN_ON_ONCE(1);
903         slot->interrupted = 0;
904 }
905 
906 #endif  /* !CONFIG_NFS_V4_1 */
907 
908 static
909 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
910                 struct nfs4_sequence_res *res,
911                 struct nfs4_slot *slot)
912 {
913         if (!slot)
914                 return;
915         slot->privileged = args->sa_privileged ? 1 : 0;
916         args->sa_slot = slot;
917 
918         res->sr_slot = slot;
919         res->sr_timestamp = jiffies;
920         res->sr_status_flags = 0;
921         res->sr_status = 1;
922 
923 }
924 
925 int nfs4_setup_sequence(struct nfs_client *client,
926                         struct nfs4_sequence_args *args,
927                         struct nfs4_sequence_res *res,
928                         struct rpc_task *task)
929 {
930         struct nfs4_session *session = nfs4_get_session(client);
931         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
932         struct nfs4_slot *slot;
933 
934         /* slot already allocated? */
935         if (res->sr_slot != NULL)
936                 goto out_start;
937 
938         if (session) {
939                 tbl = &session->fc_slot_table;
940                 task->tk_timeout = 0;
941         }
942 
943         for (;;) {
944                 spin_lock(&tbl->slot_tbl_lock);
945                 /* The state manager will wait until the slot table is empty */
946                 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
947                         goto out_sleep;
948 
949                 slot = nfs4_alloc_slot(tbl);
950                 if (IS_ERR(slot)) {
951                         /* Try again in 1/4 second */
952                         if (slot == ERR_PTR(-ENOMEM))
953                                 task->tk_timeout = HZ >> 2;
954                         goto out_sleep;
955                 }
956                 spin_unlock(&tbl->slot_tbl_lock);
957 
958                 if (likely(!slot->interrupted))
959                         break;
960                 nfs4_sequence_process_interrupted(client,
961                                 slot, task->tk_msg.rpc_cred);
962         }
963 
964         nfs4_sequence_attach_slot(args, res, slot);
965 
966         trace_nfs4_setup_sequence(session, args);
967 out_start:
968         rpc_call_start(task);
969         return 0;
970 
971 out_sleep:
972         if (args->sa_privileged)
973                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
974                                 NULL, RPC_PRIORITY_PRIVILEGED);
975         else
976                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
977         spin_unlock(&tbl->slot_tbl_lock);
978         return -EAGAIN;
979 }
980 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
981 
982 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
983 {
984         struct nfs4_call_sync_data *data = calldata;
985         nfs4_setup_sequence(data->seq_server->nfs_client,
986                                 data->seq_args, data->seq_res, task);
987 }
988 
989 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
990 {
991         struct nfs4_call_sync_data *data = calldata;
992         nfs4_sequence_done(task, data->seq_res);
993 }
994 
995 static const struct rpc_call_ops nfs40_call_sync_ops = {
996         .rpc_call_prepare = nfs40_call_sync_prepare,
997         .rpc_call_done = nfs40_call_sync_done,
998 };
999 
1000 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1001                                    struct nfs_server *server,
1002                                    struct rpc_message *msg,
1003                                    struct nfs4_sequence_args *args,
1004                                    struct nfs4_sequence_res *res)
1005 {
1006         int ret;
1007         struct rpc_task *task;
1008         struct nfs_client *clp = server->nfs_client;
1009         struct nfs4_call_sync_data data = {
1010                 .seq_server = server,
1011                 .seq_args = args,
1012                 .seq_res = res,
1013         };
1014         struct rpc_task_setup task_setup = {
1015                 .rpc_client = clnt,
1016                 .rpc_message = msg,
1017                 .callback_ops = clp->cl_mvops->call_sync_ops,
1018                 .callback_data = &data
1019         };
1020 
1021         task = rpc_run_task(&task_setup);
1022         if (IS_ERR(task))
1023                 ret = PTR_ERR(task);
1024         else {
1025                 ret = task->tk_status;
1026                 rpc_put_task(task);
1027         }
1028         return ret;
1029 }
1030 
1031 int nfs4_call_sync(struct rpc_clnt *clnt,
1032                    struct nfs_server *server,
1033                    struct rpc_message *msg,
1034                    struct nfs4_sequence_args *args,
1035                    struct nfs4_sequence_res *res,
1036                    int cache_reply)
1037 {
1038         nfs4_init_sequence(args, res, cache_reply);
1039         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1040 }
1041 
1042 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1043                 unsigned long timestamp)
1044 {
1045         struct nfs_inode *nfsi = NFS_I(dir);
1046 
1047         spin_lock(&dir->i_lock);
1048         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1049         if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) {
1050                 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1051                 nfsi->attrtimeo_timestamp = jiffies;
1052         } else {
1053                 nfs_force_lookup_revalidate(dir);
1054                 if (cinfo->before != inode_peek_iversion_raw(dir))
1055                         nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1056                                 NFS_INO_INVALID_ACL;
1057         }
1058         inode_set_iversion_raw(dir, cinfo->after);
1059         nfsi->read_cache_jiffies = timestamp;
1060         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1061         nfs_fscache_invalidate(dir);
1062         spin_unlock(&dir->i_lock);
1063 }
1064 
1065 struct nfs4_opendata {
1066         struct kref kref;
1067         struct nfs_openargs o_arg;
1068         struct nfs_openres o_res;
1069         struct nfs_open_confirmargs c_arg;
1070         struct nfs_open_confirmres c_res;
1071         struct nfs4_string owner_name;
1072         struct nfs4_string group_name;
1073         struct nfs4_label *a_label;
1074         struct nfs_fattr f_attr;
1075         struct nfs4_label *f_label;
1076         struct dentry *dir;
1077         struct dentry *dentry;
1078         struct nfs4_state_owner *owner;
1079         struct nfs4_state *state;
1080         struct iattr attrs;
1081         unsigned long timestamp;
1082         bool rpc_done;
1083         bool file_created;
1084         bool is_recover;
1085         bool cancelled;
1086         int rpc_status;
1087 };
1088 
1089 struct nfs4_open_createattrs {
1090         struct nfs4_label *label;
1091         struct iattr *sattr;
1092         const __u32 verf[2];
1093 };
1094 
1095 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1096                 int err, struct nfs4_exception *exception)
1097 {
1098         if (err != -EINVAL)
1099                 return false;
1100         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1101                 return false;
1102         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1103         exception->retry = 1;
1104         return true;
1105 }
1106 
1107 static u32
1108 nfs4_map_atomic_open_share(struct nfs_server *server,
1109                 fmode_t fmode, int openflags)
1110 {
1111         u32 res = 0;
1112 
1113         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1114         case FMODE_READ:
1115                 res = NFS4_SHARE_ACCESS_READ;
1116                 break;
1117         case FMODE_WRITE:
1118                 res = NFS4_SHARE_ACCESS_WRITE;
1119                 break;
1120         case FMODE_READ|FMODE_WRITE:
1121                 res = NFS4_SHARE_ACCESS_BOTH;
1122         }
1123         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1124                 goto out;
1125         /* Want no delegation if we're using O_DIRECT */
1126         if (openflags & O_DIRECT)
1127                 res |= NFS4_SHARE_WANT_NO_DELEG;
1128 out:
1129         return res;
1130 }
1131 
1132 static enum open_claim_type4
1133 nfs4_map_atomic_open_claim(struct nfs_server *server,
1134                 enum open_claim_type4 claim)
1135 {
1136         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1137                 return claim;
1138         switch (claim) {
1139         default:
1140                 return claim;
1141         case NFS4_OPEN_CLAIM_FH:
1142                 return NFS4_OPEN_CLAIM_NULL;
1143         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1144                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1145         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1146                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1147         }
1148 }
1149 
1150 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1151 {
1152         p->o_res.f_attr = &p->f_attr;
1153         p->o_res.f_label = p->f_label;
1154         p->o_res.seqid = p->o_arg.seqid;
1155         p->c_res.seqid = p->c_arg.seqid;
1156         p->o_res.server = p->o_arg.server;
1157         p->o_res.access_request = p->o_arg.access;
1158         nfs_fattr_init(&p->f_attr);
1159         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1160 }
1161 
1162 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1163                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1164                 const struct nfs4_open_createattrs *c,
1165                 enum open_claim_type4 claim,
1166                 gfp_t gfp_mask)
1167 {
1168         struct dentry *parent = dget_parent(dentry);
1169         struct inode *dir = d_inode(parent);
1170         struct nfs_server *server = NFS_SERVER(dir);
1171         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1172         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1173         struct nfs4_opendata *p;
1174 
1175         p = kzalloc(sizeof(*p), gfp_mask);
1176         if (p == NULL)
1177                 goto err;
1178 
1179         p->f_label = nfs4_label_alloc(server, gfp_mask);
1180         if (IS_ERR(p->f_label))
1181                 goto err_free_p;
1182 
1183         p->a_label = nfs4_label_alloc(server, gfp_mask);
1184         if (IS_ERR(p->a_label))
1185                 goto err_free_f;
1186 
1187         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1188         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1189         if (IS_ERR(p->o_arg.seqid))
1190                 goto err_free_label;
1191         nfs_sb_active(dentry->d_sb);
1192         p->dentry = dget(dentry);
1193         p->dir = parent;
1194         p->owner = sp;
1195         atomic_inc(&sp->so_count);
1196         p->o_arg.open_flags = flags;
1197         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1198         p->o_arg.umask = current_umask();
1199         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1200         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1201                         fmode, flags);
1202         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1203          * will return permission denied for all bits until close */
1204         if (!(flags & O_EXCL)) {
1205                 /* ask server to check for all possible rights as results
1206                  * are cached */
1207                 switch (p->o_arg.claim) {
1208                 default:
1209                         break;
1210                 case NFS4_OPEN_CLAIM_NULL:
1211                 case NFS4_OPEN_CLAIM_FH:
1212                         p->o_arg.access = NFS4_ACCESS_READ |
1213                                 NFS4_ACCESS_MODIFY |
1214                                 NFS4_ACCESS_EXTEND |
1215                                 NFS4_ACCESS_EXECUTE;
1216                 }
1217         }
1218         p->o_arg.clientid = server->nfs_client->cl_clientid;
1219         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1220         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1221         p->o_arg.name = &dentry->d_name;
1222         p->o_arg.server = server;
1223         p->o_arg.bitmask = nfs4_bitmask(server, label);
1224         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1225         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1226         switch (p->o_arg.claim) {
1227         case NFS4_OPEN_CLAIM_NULL:
1228         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1229         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1230                 p->o_arg.fh = NFS_FH(dir);
1231                 break;
1232         case NFS4_OPEN_CLAIM_PREVIOUS:
1233         case NFS4_OPEN_CLAIM_FH:
1234         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1235         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1236                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1237         }
1238         if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) {
1239                 p->o_arg.u.attrs = &p->attrs;
1240                 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1241 
1242                 memcpy(p->o_arg.u.verifier.data, c->verf,
1243                                 sizeof(p->o_arg.u.verifier.data));
1244         }
1245         p->c_arg.fh = &p->o_res.fh;
1246         p->c_arg.stateid = &p->o_res.stateid;
1247         p->c_arg.seqid = p->o_arg.seqid;
1248         nfs4_init_opendata_res(p);
1249         kref_init(&p->kref);
1250         return p;
1251 
1252 err_free_label:
1253         nfs4_label_free(p->a_label);
1254 err_free_f:
1255         nfs4_label_free(p->f_label);
1256 err_free_p:
1257         kfree(p);
1258 err:
1259         dput(parent);
1260         return NULL;
1261 }
1262 
1263 static void nfs4_opendata_free(struct kref *kref)
1264 {
1265         struct nfs4_opendata *p = container_of(kref,
1266                         struct nfs4_opendata, kref);
1267         struct super_block *sb = p->dentry->d_sb;
1268 
1269         nfs_free_seqid(p->o_arg.seqid);
1270         nfs4_sequence_free_slot(&p->o_res.seq_res);
1271         if (p->state != NULL)
1272                 nfs4_put_open_state(p->state);
1273         nfs4_put_state_owner(p->owner);
1274 
1275         nfs4_label_free(p->a_label);
1276         nfs4_label_free(p->f_label);
1277 
1278         dput(p->dir);
1279         dput(p->dentry);
1280         nfs_sb_deactive(sb);
1281         nfs_fattr_free_names(&p->f_attr);
1282         kfree(p->f_attr.mdsthreshold);
1283         kfree(p);
1284 }
1285 
1286 static void nfs4_opendata_put(struct nfs4_opendata *p)
1287 {
1288         if (p != NULL)
1289                 kref_put(&p->kref, nfs4_opendata_free);
1290 }
1291 
1292 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1293                 fmode_t fmode)
1294 {
1295         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1296         case FMODE_READ|FMODE_WRITE:
1297                 return state->n_rdwr != 0;
1298         case FMODE_WRITE:
1299                 return state->n_wronly != 0;
1300         case FMODE_READ:
1301                 return state->n_rdonly != 0;
1302         }
1303         WARN_ON_ONCE(1);
1304         return false;
1305 }
1306 
1307 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1308 {
1309         int ret = 0;
1310 
1311         if (open_mode & (O_EXCL|O_TRUNC))
1312                 goto out;
1313         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1314                 case FMODE_READ:
1315                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1316                                 && state->n_rdonly != 0;
1317                         break;
1318                 case FMODE_WRITE:
1319                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1320                                 && state->n_wronly != 0;
1321                         break;
1322                 case FMODE_READ|FMODE_WRITE:
1323                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1324                                 && state->n_rdwr != 0;
1325         }
1326 out:
1327         return ret;
1328 }
1329 
1330 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1331                 enum open_claim_type4 claim)
1332 {
1333         if (delegation == NULL)
1334                 return 0;
1335         if ((delegation->type & fmode) != fmode)
1336                 return 0;
1337         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1338                 return 0;
1339         switch (claim) {
1340         case NFS4_OPEN_CLAIM_NULL:
1341         case NFS4_OPEN_CLAIM_FH:
1342                 break;
1343         case NFS4_OPEN_CLAIM_PREVIOUS:
1344                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1345                         break;
1346         default:
1347                 return 0;
1348         }
1349         nfs_mark_delegation_referenced(delegation);
1350         return 1;
1351 }
1352 
1353 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1354 {
1355         switch (fmode) {
1356                 case FMODE_WRITE:
1357                         state->n_wronly++;
1358                         break;
1359                 case FMODE_READ:
1360                         state->n_rdonly++;
1361                         break;
1362                 case FMODE_READ|FMODE_WRITE:
1363                         state->n_rdwr++;
1364         }
1365         nfs4_state_set_mode_locked(state, state->state | fmode);
1366 }
1367 
1368 #ifdef CONFIG_NFS_V4_1
1369 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1370 {
1371         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1372                 return true;
1373         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1374                 return true;
1375         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1376                 return true;
1377         return false;
1378 }
1379 #endif /* CONFIG_NFS_V4_1 */
1380 
1381 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1382 {
1383         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1384                 wake_up_all(&state->waitq);
1385 }
1386 
1387 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
1388                 const nfs4_stateid *stateid)
1389 {
1390         u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
1391         u32 stateid_seqid = be32_to_cpu(stateid->seqid);
1392 
1393         if (stateid_seqid == state_seqid + 1U ||
1394             (stateid_seqid == 1U && state_seqid == 0xffffffffU))
1395                 nfs_state_log_update_open_stateid(state);
1396         else
1397                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1398 }
1399 
1400 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1401 {
1402         struct nfs_client *clp = state->owner->so_server->nfs_client;
1403         bool need_recover = false;
1404 
1405         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1406                 need_recover = true;
1407         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1408                 need_recover = true;
1409         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1410                 need_recover = true;
1411         if (need_recover)
1412                 nfs4_state_mark_reclaim_nograce(clp, state);
1413 }
1414 
1415 /*
1416  * Check for whether or not the caller may update the open stateid
1417  * to the value passed in by stateid.
1418  *
1419  * Note: This function relies heavily on the server implementing
1420  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1421  * correctly.
1422  * i.e. The stateid seqids have to be initialised to 1, and
1423  * are then incremented on every state transition.
1424  */
1425 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1426                 const nfs4_stateid *stateid)
1427 {
1428         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
1429             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1430                 if (stateid->seqid == cpu_to_be32(1))
1431                         nfs_state_log_update_open_stateid(state);
1432                 else
1433                         set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1434                 return true;
1435         }
1436 
1437         if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1438                 nfs_state_log_out_of_order_open_stateid(state, stateid);
1439                 return true;
1440         }
1441         return false;
1442 }
1443 
1444 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1445 {
1446         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1447                 return;
1448         if (state->n_wronly)
1449                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1450         if (state->n_rdonly)
1451                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1452         if (state->n_rdwr)
1453                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1454         set_bit(NFS_OPEN_STATE, &state->flags);
1455 }
1456 
1457 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1458                 nfs4_stateid *stateid, fmode_t fmode)
1459 {
1460         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1461         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1462         case FMODE_WRITE:
1463                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1464                 break;
1465         case FMODE_READ:
1466                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1467                 break;
1468         case 0:
1469                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1470                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1471                 clear_bit(NFS_OPEN_STATE, &state->flags);
1472         }
1473         if (stateid == NULL)
1474                 return;
1475         /* Handle OPEN+OPEN_DOWNGRADE races */
1476         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1477             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1478                 nfs_resync_open_stateid_locked(state);
1479                 goto out;
1480         }
1481         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1482                 nfs4_stateid_copy(&state->stateid, stateid);
1483         nfs4_stateid_copy(&state->open_stateid, stateid);
1484         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1485 out:
1486         nfs_state_log_update_open_stateid(state);
1487 }
1488 
1489 static void nfs_clear_open_stateid(struct nfs4_state *state,
1490         nfs4_stateid *arg_stateid,
1491         nfs4_stateid *stateid, fmode_t fmode)
1492 {
1493         write_seqlock(&state->seqlock);
1494         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1495         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1496                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1497         write_sequnlock(&state->seqlock);
1498         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1499                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1500 }
1501 
1502 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1503                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1504 {
1505         DEFINE_WAIT(wait);
1506         int status = 0;
1507         for (;;) {
1508 
1509                 if (!nfs_need_update_open_stateid(state, stateid))
1510                         return;
1511                 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1512                         break;
1513                 if (status)
1514                         break;
1515                 /* Rely on seqids for serialisation with NFSv4.0 */
1516                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1517                         break;
1518 
1519                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1520                 /*
1521                  * Ensure we process the state changes in the same order
1522                  * in which the server processed them by delaying the
1523                  * update of the stateid until we are in sequence.
1524                  */
1525                 write_sequnlock(&state->seqlock);
1526                 spin_unlock(&state->owner->so_lock);
1527                 rcu_read_unlock();
1528                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1529                 if (!signal_pending(current)) {
1530                         if (schedule_timeout(5*HZ) == 0)
1531                                 status = -EAGAIN;
1532                         else
1533                                 status = 0;
1534                 } else
1535                         status = -EINTR;
1536                 finish_wait(&state->waitq, &wait);
1537                 rcu_read_lock();
1538                 spin_lock(&state->owner->so_lock);
1539                 write_seqlock(&state->seqlock);
1540         }
1541 
1542         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1543             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1544                 nfs4_stateid_copy(freeme, &state->open_stateid);
1545                 nfs_test_and_clear_all_open_stateid(state);
1546         }
1547 
1548         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1549                 nfs4_stateid_copy(&state->stateid, stateid);
1550         nfs4_stateid_copy(&state->open_stateid, stateid);
1551         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1552         nfs_state_log_update_open_stateid(state);
1553 }
1554 
1555 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1556                 const nfs4_stateid *open_stateid,
1557                 fmode_t fmode,
1558                 nfs4_stateid *freeme)
1559 {
1560         /*
1561          * Protect the call to nfs4_state_set_mode_locked and
1562          * serialise the stateid update
1563          */
1564         write_seqlock(&state->seqlock);
1565         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1566         switch (fmode) {
1567         case FMODE_READ:
1568                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1569                 break;
1570         case FMODE_WRITE:
1571                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1572                 break;
1573         case FMODE_READ|FMODE_WRITE:
1574                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1575         }
1576         set_bit(NFS_OPEN_STATE, &state->flags);
1577         write_sequnlock(&state->seqlock);
1578 }
1579 
1580 static void nfs_state_set_delegation(struct nfs4_state *state,
1581                 const nfs4_stateid *deleg_stateid,
1582                 fmode_t fmode)
1583 {
1584         /*
1585          * Protect the call to nfs4_state_set_mode_locked and
1586          * serialise the stateid update
1587          */
1588         write_seqlock(&state->seqlock);
1589         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1590         set_bit(NFS_DELEGATED_STATE, &state->flags);
1591         write_sequnlock(&state->seqlock);
1592 }
1593 
1594 static int update_open_stateid(struct nfs4_state *state,
1595                 const nfs4_stateid *open_stateid,
1596                 const nfs4_stateid *delegation,
1597                 fmode_t fmode)
1598 {
1599         struct nfs_server *server = NFS_SERVER(state->inode);
1600         struct nfs_client *clp = server->nfs_client;
1601         struct nfs_inode *nfsi = NFS_I(state->inode);
1602         struct nfs_delegation *deleg_cur;
1603         nfs4_stateid freeme = { };
1604         int ret = 0;
1605 
1606         fmode &= (FMODE_READ|FMODE_WRITE);
1607 
1608         rcu_read_lock();
1609         spin_lock(&state->owner->so_lock);
1610         if (open_stateid != NULL) {
1611                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1612                 ret = 1;
1613         }
1614 
1615         deleg_cur = rcu_dereference(nfsi->delegation);
1616         if (deleg_cur == NULL)
1617                 goto no_delegation;
1618 
1619         spin_lock(&deleg_cur->lock);
1620         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1621            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1622             (deleg_cur->type & fmode) != fmode)
1623                 goto no_delegation_unlock;
1624 
1625         if (delegation == NULL)
1626                 delegation = &deleg_cur->stateid;
1627         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1628                 goto no_delegation_unlock;
1629 
1630         nfs_mark_delegation_referenced(deleg_cur);
1631         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1632         ret = 1;
1633 no_delegation_unlock:
1634         spin_unlock(&deleg_cur->lock);
1635 no_delegation:
1636         if (ret)
1637                 update_open_stateflags(state, fmode);
1638         spin_unlock(&state->owner->so_lock);
1639         rcu_read_unlock();
1640 
1641         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1642                 nfs4_schedule_state_manager(clp);
1643         if (freeme.type != 0)
1644                 nfs4_test_and_free_stateid(server, &freeme,
1645                                 state->owner->so_cred);
1646 
1647         return ret;
1648 }
1649 
1650 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1651                 const nfs4_stateid *stateid)
1652 {
1653         struct nfs4_state *state = lsp->ls_state;
1654         bool ret = false;
1655 
1656         spin_lock(&state->state_lock);
1657         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1658                 goto out_noupdate;
1659         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1660                 goto out_noupdate;
1661         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1662         ret = true;
1663 out_noupdate:
1664         spin_unlock(&state->state_lock);
1665         return ret;
1666 }
1667 
1668 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1669 {
1670         struct nfs_delegation *delegation;
1671 
1672         rcu_read_lock();
1673         delegation = rcu_dereference(NFS_I(inode)->delegation);
1674         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1675                 rcu_read_unlock();
1676                 return;
1677         }
1678         rcu_read_unlock();
1679         nfs4_inode_return_delegation(inode);
1680 }
1681 
1682 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1683 {
1684         struct nfs4_state *state = opendata->state;
1685         struct nfs_inode *nfsi = NFS_I(state->inode);
1686         struct nfs_delegation *delegation;
1687         int open_mode = opendata->o_arg.open_flags;
1688         fmode_t fmode = opendata->o_arg.fmode;
1689         enum open_claim_type4 claim = opendata->o_arg.claim;
1690         nfs4_stateid stateid;
1691         int ret = -EAGAIN;
1692 
1693         for (;;) {
1694                 spin_lock(&state->owner->so_lock);
1695                 if (can_open_cached(state, fmode, open_mode)) {
1696                         update_open_stateflags(state, fmode);
1697                         spin_unlock(&state->owner->so_lock);
1698                         goto out_return_state;
1699                 }
1700                 spin_unlock(&state->owner->so_lock);
1701                 rcu_read_lock();
1702                 delegation = rcu_dereference(nfsi->delegation);
1703                 if (!can_open_delegated(delegation, fmode, claim)) {
1704                         rcu_read_unlock();
1705                         break;
1706                 }
1707                 /* Save the delegation */
1708                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1709                 rcu_read_unlock();
1710                 nfs_release_seqid(opendata->o_arg.seqid);
1711                 if (!opendata->is_recover) {
1712                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1713                         if (ret != 0)
1714                                 goto out;
1715                 }
1716                 ret = -EAGAIN;
1717 
1718                 /* Try to update the stateid using the delegation */
1719                 if (update_open_stateid(state, NULL, &stateid, fmode))
1720                         goto out_return_state;
1721         }
1722 out:
1723         return ERR_PTR(ret);
1724 out_return_state:
1725         atomic_inc(&state->count);
1726         return state;
1727 }
1728 
1729 static void
1730 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1731 {
1732         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1733         struct nfs_delegation *delegation;
1734         int delegation_flags = 0;
1735 
1736         rcu_read_lock();
1737         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1738         if (delegation)
1739                 delegation_flags = delegation->flags;
1740         rcu_read_unlock();
1741         switch (data->o_arg.claim) {
1742         default:
1743                 break;
1744         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1745         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1746                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1747                                    "returning a delegation for "
1748                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1749                                    clp->cl_hostname);
1750                 return;
1751         }
1752         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1753                 nfs_inode_set_delegation(state->inode,
1754                                          data->owner->so_cred,
1755                                          &data->o_res);
1756         else
1757                 nfs_inode_reclaim_delegation(state->inode,
1758                                              data->owner->so_cred,
1759                                              &data->o_res);
1760 }
1761 
1762 /*
1763  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1764  * and update the nfs4_state.
1765  */
1766 static struct nfs4_state *
1767 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1768 {
1769         struct inode *inode = data->state->inode;
1770         struct nfs4_state *state = data->state;
1771         int ret;
1772 
1773         if (!data->rpc_done) {
1774                 if (data->rpc_status)
1775                         return ERR_PTR(data->rpc_status);
1776                 /* cached opens have already been processed */
1777                 goto update;
1778         }
1779 
1780         ret = nfs_refresh_inode(inode, &data->f_attr);
1781         if (ret)
1782                 return ERR_PTR(ret);
1783 
1784         if (data->o_res.delegation_type != 0)
1785                 nfs4_opendata_check_deleg(data, state);
1786 update:
1787         update_open_stateid(state, &data->o_res.stateid, NULL,
1788                             data->o_arg.fmode);
1789         atomic_inc(&state->count);
1790 
1791         return state;
1792 }
1793 
1794 static struct inode *
1795 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1796 {
1797         struct inode *inode;
1798 
1799         switch (data->o_arg.claim) {
1800         case NFS4_OPEN_CLAIM_NULL:
1801         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1802         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1803                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1804                         return ERR_PTR(-EAGAIN);
1805                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1806                                 &data->f_attr, data->f_label);
1807                 break;
1808         default:
1809                 inode = d_inode(data->dentry);
1810                 ihold(inode);
1811                 nfs_refresh_inode(inode, &data->f_attr);
1812         }
1813         return inode;
1814 }
1815 
1816 static struct nfs4_state *
1817 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
1818 {
1819         struct nfs4_state *state;
1820         struct inode *inode;
1821 
1822         inode = nfs4_opendata_get_inode(data);
1823         if (IS_ERR(inode))
1824                 return ERR_CAST(inode);
1825         if (data->state != NULL && data->state->inode == inode) {
1826                 state = data->state;
1827                 atomic_inc(&state->count);
1828         } else
1829                 state = nfs4_get_open_state(inode, data->owner);
1830         iput(inode);
1831         if (state == NULL)
1832                 state = ERR_PTR(-ENOMEM);
1833         return state;
1834 }
1835 
1836 static struct nfs4_state *
1837 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1838 {
1839         struct nfs4_state *state;
1840 
1841         if (!data->rpc_done) {
1842                 state = nfs4_try_open_cached(data);
1843                 trace_nfs4_cached_open(data->state);
1844                 goto out;
1845         }
1846 
1847         state = nfs4_opendata_find_nfs4_state(data);
1848         if (IS_ERR(state))
1849                 goto out;
1850 
1851         if (data->o_res.delegation_type != 0)
1852                 nfs4_opendata_check_deleg(data, state);
1853         update_open_stateid(state, &data->o_res.stateid, NULL,
1854                         data->o_arg.fmode);
1855 out:
1856         nfs_release_seqid(data->o_arg.seqid);
1857         return state;
1858 }
1859 
1860 static struct nfs4_state *
1861 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1862 {
1863         struct nfs4_state *ret;
1864 
1865         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1866                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1867         else
1868                 ret = _nfs4_opendata_to_nfs4_state(data);
1869         nfs4_sequence_free_slot(&data->o_res.seq_res);
1870         return ret;
1871 }
1872 
1873 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1874 {
1875         struct nfs_inode *nfsi = NFS_I(state->inode);
1876         struct nfs_open_context *ctx;
1877 
1878         spin_lock(&state->inode->i_lock);
1879         list_for_each_entry(ctx, &nfsi->open_files, list) {
1880                 if (ctx->state != state)
1881                         continue;
1882                 get_nfs_open_context(ctx);
1883                 spin_unlock(&state->inode->i_lock);
1884                 return ctx;
1885         }
1886         spin_unlock(&state->inode->i_lock);
1887         return ERR_PTR(-ENOENT);
1888 }
1889 
1890 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1891                 struct nfs4_state *state, enum open_claim_type4 claim)
1892 {
1893         struct nfs4_opendata *opendata;
1894 
1895         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1896                         NULL, claim, GFP_NOFS);
1897         if (opendata == NULL)
1898                 return ERR_PTR(-ENOMEM);
1899         opendata->state = state;
1900         atomic_inc(&state->count);
1901         return opendata;
1902 }
1903 
1904 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1905                 fmode_t fmode)
1906 {
1907         struct nfs4_state *newstate;
1908         int ret;
1909 
1910         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1911                 return 0;
1912         opendata->o_arg.open_flags = 0;
1913         opendata->o_arg.fmode = fmode;
1914         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1915                         NFS_SB(opendata->dentry->d_sb),
1916                         fmode, 0);
1917         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1918         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1919         nfs4_init_opendata_res(opendata);
1920         ret = _nfs4_recover_proc_open(opendata);
1921         if (ret != 0)
1922                 return ret; 
1923         newstate = nfs4_opendata_to_nfs4_state(opendata);
1924         if (IS_ERR(newstate))
1925                 return PTR_ERR(newstate);
1926         if (newstate != opendata->state)
1927                 ret = -ESTALE;
1928         nfs4_close_state(newstate, fmode);
1929         return ret;
1930 }
1931 
1932 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1933 {
1934         int ret;
1935 
1936         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1937         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1938         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1939         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1940         /* memory barrier prior to reading state->n_* */
1941         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1942         clear_bit(NFS_OPEN_STATE, &state->flags);
1943         smp_rmb();
1944         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1945         if (ret != 0)
1946                 return ret;
1947         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1948         if (ret != 0)
1949                 return ret;
1950         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1951         if (ret != 0)
1952                 return ret;
1953         /*
1954          * We may have performed cached opens for all three recoveries.
1955          * Check if we need to update the current stateid.
1956          */
1957         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1958             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1959                 write_seqlock(&state->seqlock);
1960                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1961                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1962                 write_sequnlock(&state->seqlock);
1963         }
1964         return 0;
1965 }
1966 
1967 /*
1968  * OPEN_RECLAIM:
1969  *      reclaim state on the server after a reboot.
1970  */
1971 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1972 {
1973         struct nfs_delegation *delegation;
1974         struct nfs4_opendata *opendata;
1975         fmode_t delegation_type = 0;
1976         int status;
1977 
1978         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1979                         NFS4_OPEN_CLAIM_PREVIOUS);
1980         if (IS_ERR(opendata))
1981                 return PTR_ERR(opendata);
1982         rcu_read_lock();
1983         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1984         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1985                 delegation_type = delegation->type;
1986         rcu_read_unlock();
1987         opendata->o_arg.u.delegation_type = delegation_type;
1988         status = nfs4_open_recover(opendata, state);
1989         nfs4_opendata_put(opendata);
1990         return status;
1991 }
1992 
1993 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1994 {
1995         struct nfs_server *server = NFS_SERVER(state->inode);
1996         struct nfs4_exception exception = { };
1997         int err;
1998         do {
1999                 err = _nfs4_do_open_reclaim(ctx, state);
2000                 trace_nfs4_open_reclaim(ctx, 0, err);
2001                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2002                         continue;
2003                 if (err != -NFS4ERR_DELAY)
2004                         break;
2005                 nfs4_handle_exception(server, err, &exception);
2006         } while (exception.retry);
2007         return err;
2008 }
2009 
2010 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2011 {
2012         struct nfs_open_context *ctx;
2013         int ret;
2014 
2015         ctx = nfs4_state_find_open_context(state);
2016         if (IS_ERR(ctx))
2017                 return -EAGAIN;
2018         ret = nfs4_do_open_reclaim(ctx, state);
2019         put_nfs_open_context(ctx);
2020         return ret;
2021 }
2022 
2023 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2024 {
2025         switch (err) {
2026                 default:
2027                         printk(KERN_ERR "NFS: %s: unhandled error "
2028                                         "%d.\n", __func__, err);
2029                 case 0:
2030                 case -ENOENT:
2031                 case -EAGAIN:
2032                 case -ESTALE:
2033                         break;
2034                 case -NFS4ERR_BADSESSION:
2035                 case -NFS4ERR_BADSLOT:
2036                 case -NFS4ERR_BAD_HIGH_SLOT:
2037                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2038                 case -NFS4ERR_DEADSESSION:
2039                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2040                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
2041                         return -EAGAIN;
2042                 case -NFS4ERR_STALE_CLIENTID:
2043                 case -NFS4ERR_STALE_STATEID:
2044                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2045                         /* Don't recall a delegation if it was lost */
2046                         nfs4_schedule_lease_recovery(server->nfs_client);
2047                         return -EAGAIN;
2048                 case -NFS4ERR_MOVED:
2049                         nfs4_schedule_migration_recovery(server);
2050                         return -EAGAIN;
2051                 case -NFS4ERR_LEASE_MOVED:
2052                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2053                         return -EAGAIN;
2054                 case -NFS4ERR_DELEG_REVOKED:
2055                 case -NFS4ERR_ADMIN_REVOKED:
2056                 case -NFS4ERR_EXPIRED:
2057                 case -NFS4ERR_BAD_STATEID:
2058                 case -NFS4ERR_OPENMODE:
2059                         nfs_inode_find_state_and_recover(state->inode,
2060                                         stateid);
2061                         nfs4_schedule_stateid_recovery(server, state);
2062                         return -EAGAIN;
2063                 case -NFS4ERR_DELAY:
2064                 case -NFS4ERR_GRACE:
2065                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2066                         ssleep(1);
2067                         return -EAGAIN;
2068                 case -ENOMEM:
2069                 case -NFS4ERR_DENIED:
2070                         if (fl) {
2071                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2072                                 if (lsp)
2073                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2074                         }
2075                         return 0;
2076         }
2077         return err;
2078 }
2079 
2080 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2081                 struct nfs4_state *state, const nfs4_stateid *stateid,
2082                 fmode_t type)
2083 {
2084         struct nfs_server *server = NFS_SERVER(state->inode);
2085         struct nfs4_opendata *opendata;
2086         int err = 0;
2087 
2088         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2089                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2090         if (IS_ERR(opendata))
2091                 return PTR_ERR(opendata);
2092         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2093         write_seqlock(&state->seqlock);
2094         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2095         write_sequnlock(&state->seqlock);
2096         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2097         switch (type & (FMODE_READ|FMODE_WRITE)) {
2098         case FMODE_READ|FMODE_WRITE:
2099         case FMODE_WRITE:
2100                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2101                 if (err)
2102                         break;
2103                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2104                 if (err)
2105                         break;
2106         case FMODE_READ:
2107                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2108         }
2109         nfs4_opendata_put(opendata);
2110         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2111 }
2112 
2113 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2114 {
2115         struct nfs4_opendata *data = calldata;
2116 
2117         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2118                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2119 }
2120 
2121 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2122 {
2123         struct nfs4_opendata *data = calldata;
2124 
2125         nfs40_sequence_done(task, &data->c_res.seq_res);
2126 
2127         data->rpc_status = task->tk_status;
2128         if (data->rpc_status == 0) {
2129                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2130                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2131                 renew_lease(data->o_res.server, data->timestamp);
2132                 data->rpc_done = true;
2133         }
2134 }
2135 
2136 static void nfs4_open_confirm_release(void *calldata)
2137 {
2138         struct nfs4_opendata *data = calldata;
2139         struct nfs4_state *state = NULL;
2140 
2141         /* If this request hasn't been cancelled, do nothing */
2142         if (!data->cancelled)
2143                 goto out_free;
2144         /* In case of error, no cleanup! */
2145         if (!data->rpc_done)
2146                 goto out_free;
2147         state = nfs4_opendata_to_nfs4_state(data);
2148         if (!IS_ERR(state))
2149                 nfs4_close_state(state, data->o_arg.fmode);
2150 out_free:
2151         nfs4_opendata_put(data);
2152 }
2153 
2154 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2155         .rpc_call_prepare = nfs4_open_confirm_prepare,
2156         .rpc_call_done = nfs4_open_confirm_done,
2157         .rpc_release = nfs4_open_confirm_release,
2158 };
2159 
2160 /*
2161  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2162  */
2163 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2164 {
2165         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2166         struct rpc_task *task;
2167         struct  rpc_message msg = {
2168                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2169                 .rpc_argp = &data->c_arg,
2170                 .rpc_resp = &data->c_res,
2171                 .rpc_cred = data->owner->so_cred,
2172         };
2173         struct rpc_task_setup task_setup_data = {
2174                 .rpc_client = server->client,
2175                 .rpc_message = &msg,
2176                 .callback_ops = &nfs4_open_confirm_ops,
2177                 .callback_data = data,
2178                 .workqueue = nfsiod_workqueue,
2179                 .flags = RPC_TASK_ASYNC,
2180         };
2181         int status;
2182 
2183         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
2184         kref_get(&data->kref);
2185         data->rpc_done = false;
2186         data->rpc_status = 0;
2187         data->timestamp = jiffies;
2188         if (data->is_recover)
2189                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
2190         task = rpc_run_task(&task_setup_data);
2191         if (IS_ERR(task))
2192                 return PTR_ERR(task);
2193         status = rpc_wait_for_completion_task(task);
2194         if (status != 0) {
2195                 data->cancelled = true;
2196                 smp_wmb();
2197         } else
2198                 status = data->rpc_status;
2199         rpc_put_task(task);
2200         return status;
2201 }
2202 
2203 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2204 {
2205         struct nfs4_opendata *data = calldata;
2206         struct nfs4_state_owner *sp = data->owner;
2207         struct nfs_client *clp = sp->so_server->nfs_client;
2208         enum open_claim_type4 claim = data->o_arg.claim;
2209 
2210         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2211                 goto out_wait;
2212         /*
2213          * Check if we still need to send an OPEN call, or if we can use
2214          * a delegation instead.
2215          */
2216         if (data->state != NULL) {
2217                 struct nfs_delegation *delegation;
2218 
2219                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2220                         goto out_no_action;
2221                 rcu_read_lock();
2222                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2223                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2224                         goto unlock_no_action;
2225                 rcu_read_unlock();
2226         }
2227         /* Update client id. */
2228         data->o_arg.clientid = clp->cl_clientid;
2229         switch (claim) {
2230         default:
2231                 break;
2232         case NFS4_OPEN_CLAIM_PREVIOUS:
2233         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2234         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2235                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2236         case NFS4_OPEN_CLAIM_FH:
2237                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2238         }
2239         data->timestamp = jiffies;
2240         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2241                                 &data->o_arg.seq_args,
2242                                 &data->o_res.seq_res,
2243                                 task) != 0)
2244                 nfs_release_seqid(data->o_arg.seqid);
2245 
2246         /* Set the create mode (note dependency on the session type) */
2247         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2248         if (data->o_arg.open_flags & O_EXCL) {
2249                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2250                 if (nfs4_has_persistent_session(clp))
2251                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2252                 else if (clp->cl_mvops->minor_version > 0)
2253                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2254         }
2255         return;
2256 unlock_no_action:
2257         trace_nfs4_cached_open(data->state);
2258         rcu_read_unlock();
2259 out_no_action:
2260         task->tk_action = NULL;
2261 out_wait:
2262         nfs4_sequence_done(task, &data->o_res.seq_res);
2263 }
2264 
2265 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2266 {
2267         struct nfs4_opendata *data = calldata;
2268 
2269         data->rpc_status = task->tk_status;
2270 
2271         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2272                 return;
2273 
2274         if (task->tk_status == 0) {
2275                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2276                         switch (data->o_res.f_attr->mode & S_IFMT) {
2277                         case S_IFREG:
2278                                 break;
2279                         case S_IFLNK:
2280                                 data->rpc_status = -ELOOP;
2281                                 break;
2282                         case S_IFDIR:
2283                                 data->rpc_status = -EISDIR;
2284                                 break;
2285                         default:
2286                                 data->rpc_status = -ENOTDIR;
2287                         }
2288                 }
2289                 renew_lease(data->o_res.server, data->timestamp);
2290                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2291                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2292         }
2293         data->rpc_done = true;
2294 }
2295 
2296 static void nfs4_open_release(void *calldata)
2297 {
2298         struct nfs4_opendata *data = calldata;
2299         struct nfs4_state *state = NULL;
2300 
2301         /* If this request hasn't been cancelled, do nothing */
2302         if (!data->cancelled)
2303                 goto out_free;
2304         /* In case of error, no cleanup! */
2305         if (data->rpc_status != 0 || !data->rpc_done)
2306                 goto out_free;
2307         /* In case we need an open_confirm, no cleanup! */
2308         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2309                 goto out_free;
2310         state = nfs4_opendata_to_nfs4_state(data);
2311         if (!IS_ERR(state))
2312                 nfs4_close_state(state, data->o_arg.fmode);
2313 out_free:
2314         nfs4_opendata_put(data);
2315 }
2316 
2317 static const struct rpc_call_ops nfs4_open_ops = {
2318         .rpc_call_prepare = nfs4_open_prepare,
2319         .rpc_call_done = nfs4_open_done,
2320         .rpc_release = nfs4_open_release,
2321 };
2322 
2323 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2324 {
2325         struct inode *dir = d_inode(data->dir);
2326         struct nfs_server *server = NFS_SERVER(dir);
2327         struct nfs_openargs *o_arg = &data->o_arg;
2328         struct nfs_openres *o_res = &data->o_res;
2329         struct rpc_task *task;
2330         struct rpc_message msg = {
2331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2332                 .rpc_argp = o_arg,
2333                 .rpc_resp = o_res,
2334                 .rpc_cred = data->owner->so_cred,
2335         };
2336         struct rpc_task_setup task_setup_data = {
2337                 .rpc_client = server->client,
2338                 .rpc_message = &msg,
2339                 .callback_ops = &nfs4_open_ops,
2340                 .callback_data = data,
2341                 .workqueue = nfsiod_workqueue,
2342                 .flags = RPC_TASK_ASYNC,
2343         };
2344         int status;
2345 
2346         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2347         kref_get(&data->kref);
2348         data->rpc_done = false;
2349         data->rpc_status = 0;
2350         data->cancelled = false;
2351         data->is_recover = false;
2352         if (isrecover) {
2353                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2354                 data->is_recover = true;
2355         }
2356         task = rpc_run_task(&task_setup_data);
2357         if (IS_ERR(task))
2358                 return PTR_ERR(task);
2359         status = rpc_wait_for_completion_task(task);
2360         if (status != 0) {
2361                 data->cancelled = true;
2362                 smp_wmb();
2363         } else
2364                 status = data->rpc_status;
2365         rpc_put_task(task);
2366 
2367         return status;
2368 }
2369 
2370 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2371 {
2372         struct inode *dir = d_inode(data->dir);
2373         struct nfs_openres *o_res = &data->o_res;
2374         int status;
2375 
2376         status = nfs4_run_open_task(data, 1);
2377         if (status != 0 || !data->rpc_done)
2378                 return status;
2379 
2380         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2381 
2382         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2383                 status = _nfs4_proc_open_confirm(data);
2384 
2385         return status;
2386 }
2387 
2388 /*
2389  * Additional permission checks in order to distinguish between an
2390  * open for read, and an open for execute. This works around the
2391  * fact that NFSv4 OPEN treats read and execute permissions as being
2392  * the same.
2393  * Note that in the non-execute case, we want to turn off permission
2394  * checking if we just created a new file (POSIX open() semantics).
2395  */
2396 static int nfs4_opendata_access(struct rpc_cred *cred,
2397                                 struct nfs4_opendata *opendata,
2398                                 struct nfs4_state *state, fmode_t fmode,
2399                                 int openflags)
2400 {
2401         struct nfs_access_entry cache;
2402         u32 mask, flags;
2403 
2404         /* access call failed or for some reason the server doesn't
2405          * support any access modes -- defer access call until later */
2406         if (opendata->o_res.access_supported == 0)
2407                 return 0;
2408 
2409         mask = 0;
2410         /*
2411          * Use openflags to check for exec, because fmode won't
2412          * always have FMODE_EXEC set when file open for exec.
2413          */
2414         if (openflags & __FMODE_EXEC) {
2415                 /* ONLY check for exec rights */
2416                 if (S_ISDIR(state->inode->i_mode))
2417                         mask = NFS4_ACCESS_LOOKUP;
2418                 else
2419                         mask = NFS4_ACCESS_EXECUTE;
2420         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2421                 mask = NFS4_ACCESS_READ;
2422 
2423         cache.cred = cred;
2424         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2425         nfs_access_add_cache(state->inode, &cache);
2426 
2427         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2428         if ((mask & ~cache.mask & flags) == 0)
2429                 return 0;
2430 
2431         return -EACCES;
2432 }
2433 
2434 /*
2435  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2436  */
2437 static int _nfs4_proc_open(struct nfs4_opendata *data)
2438 {
2439         struct inode *dir = d_inode(data->dir);
2440         struct nfs_server *server = NFS_SERVER(dir);
2441         struct nfs_openargs *o_arg = &data->o_arg;
2442         struct nfs_openres *o_res = &data->o_res;
2443         int status;
2444 
2445         status = nfs4_run_open_task(data, 0);
2446         if (!data->rpc_done)
2447                 return status;
2448         if (status != 0) {
2449                 if (status == -NFS4ERR_BADNAME &&
2450                                 !(o_arg->open_flags & O_CREAT))
2451                         return -ENOENT;
2452                 return status;
2453         }
2454 
2455         nfs_fattr_map_and_free_names(server, &data->f_attr);
2456 
2457         if (o_arg->open_flags & O_CREAT) {
2458                 if (o_arg->open_flags & O_EXCL)
2459                         data->file_created = true;
2460                 else if (o_res->cinfo.before != o_res->cinfo.after)
2461                         data->file_created = true;
2462                 if (data->file_created ||
2463                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2464                         update_changeattr(dir, &o_res->cinfo,
2465                                         o_res->f_attr->time_start);
2466         }
2467         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2468                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2469         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2470                 status = _nfs4_proc_open_confirm(data);
2471                 if (status != 0)
2472                         return status;
2473         }
2474         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2475                 nfs4_sequence_free_slot(&o_res->seq_res);
2476                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2477         }
2478         return 0;
2479 }
2480 
2481 /*
2482  * OPEN_EXPIRED:
2483  *      reclaim state on the server after a network partition.
2484  *      Assumes caller holds the appropriate lock
2485  */
2486 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2487 {
2488         struct nfs4_opendata *opendata;
2489         int ret;
2490 
2491         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2492                         NFS4_OPEN_CLAIM_FH);
2493         if (IS_ERR(opendata))
2494                 return PTR_ERR(opendata);
2495         ret = nfs4_open_recover(opendata, state);
2496         if (ret == -ESTALE)
2497                 d_drop(ctx->dentry);
2498         nfs4_opendata_put(opendata);
2499         return ret;
2500 }
2501 
2502 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2503 {
2504         struct nfs_server *server = NFS_SERVER(state->inode);
2505         struct nfs4_exception exception = { };
2506         int err;
2507 
2508         do {
2509                 err = _nfs4_open_expired(ctx, state);
2510                 trace_nfs4_open_expired(ctx, 0, err);
2511                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2512                         continue;
2513                 switch (err) {
2514                 default:
2515                         goto out;
2516                 case -NFS4ERR_GRACE:
2517                 case -NFS4ERR_DELAY:
2518                         nfs4_handle_exception(server, err, &exception);
2519                         err = 0;
2520                 }
2521         } while (exception.retry);
2522 out:
2523         return err;
2524 }
2525 
2526 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2527 {
2528         struct nfs_open_context *ctx;
2529         int ret;
2530 
2531         ctx = nfs4_state_find_open_context(state);
2532         if (IS_ERR(ctx))
2533                 return -EAGAIN;
2534         ret = nfs4_do_open_expired(ctx, state);
2535         put_nfs_open_context(ctx);
2536         return ret;
2537 }
2538 
2539 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2540                 const nfs4_stateid *stateid)
2541 {
2542         nfs_remove_bad_delegation(state->inode, stateid);
2543         write_seqlock(&state->seqlock);
2544         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2545         write_sequnlock(&state->seqlock);
2546         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2547 }
2548 
2549 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2550 {
2551         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2552                 nfs_finish_clear_delegation_stateid(state, NULL);
2553 }
2554 
2555 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2556 {
2557         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2558         nfs40_clear_delegation_stateid(state);
2559         return nfs4_open_expired(sp, state);
2560 }
2561 
2562 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2563                 nfs4_stateid *stateid,
2564                 struct rpc_cred *cred)
2565 {
2566         return -NFS4ERR_BAD_STATEID;
2567 }
2568 
2569 #if defined(CONFIG_NFS_V4_1)
2570 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2571                 nfs4_stateid *stateid,
2572                 struct rpc_cred *cred)
2573 {
2574         int status;
2575 
2576         switch (stateid->type) {
2577         default:
2578                 break;
2579         case NFS4_INVALID_STATEID_TYPE:
2580         case NFS4_SPECIAL_STATEID_TYPE:
2581                 return -NFS4ERR_BAD_STATEID;
2582         case NFS4_REVOKED_STATEID_TYPE:
2583                 goto out_free;
2584         }
2585 
2586         status = nfs41_test_stateid(server, stateid, cred);
2587         switch (status) {
2588         case -NFS4ERR_EXPIRED:
2589         case -NFS4ERR_ADMIN_REVOKED:
2590         case -NFS4ERR_DELEG_REVOKED:
2591                 break;
2592         default:
2593                 return status;
2594         }
2595 out_free:
2596         /* Ack the revoked state to the server */
2597         nfs41_free_stateid(server, stateid, cred, true);
2598         return -NFS4ERR_EXPIRED;
2599 }
2600 
2601 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2602 {
2603         struct nfs_server *server = NFS_SERVER(state->inode);
2604         nfs4_stateid stateid;
2605         struct nfs_delegation *delegation;
2606         struct rpc_cred *cred;
2607         int status;
2608 
2609         /* Get the delegation credential for use by test/free_stateid */
2610         rcu_read_lock();
2611         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2612         if (delegation == NULL) {
2613                 rcu_read_unlock();
2614                 return;
2615         }
2616 
2617         nfs4_stateid_copy(&stateid, &delegation->stateid);
2618         if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) ||
2619                 !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2620                         &delegation->flags)) {
2621                 rcu_read_unlock();
2622                 nfs_finish_clear_delegation_stateid(state, &stateid);
2623                 return;
2624         }
2625 
2626         cred = get_rpccred(delegation->cred);
2627         rcu_read_unlock();
2628         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2629         trace_nfs4_test_delegation_stateid(state, NULL, status);
2630         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2631                 nfs_finish_clear_delegation_stateid(state, &stateid);
2632 
2633         put_rpccred(cred);
2634 }
2635 
2636 /**
2637  * nfs41_check_expired_locks - possibly free a lock stateid
2638  *
2639  * @state: NFSv4 state for an inode
2640  *
2641  * Returns NFS_OK if recovery for this stateid is now finished.
2642  * Otherwise a negative NFS4ERR value is returned.
2643  */
2644 static int nfs41_check_expired_locks(struct nfs4_state *state)
2645 {
2646         int status, ret = NFS_OK;
2647         struct nfs4_lock_state *lsp, *prev = NULL;
2648         struct nfs_server *server = NFS_SERVER(state->inode);
2649 
2650         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2651                 goto out;
2652 
2653         spin_lock(&state->state_lock);
2654         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2655                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2656                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
2657 
2658                         refcount_inc(&lsp->ls_count);
2659                         spin_unlock(&state->state_lock);
2660 
2661                         nfs4_put_lock_state(prev);
2662                         prev = lsp;
2663 
2664                         status = nfs41_test_and_free_expired_stateid(server,
2665                                         &lsp->ls_stateid,
2666                                         cred);
2667                         trace_nfs4_test_lock_stateid(state, lsp, status);
2668                         if (status == -NFS4ERR_EXPIRED ||
2669                             status == -NFS4ERR_BAD_STATEID) {
2670                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2671                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2672                                 if (!recover_lost_locks)
2673                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2674                         } else if (status != NFS_OK) {
2675                                 ret = status;
2676                                 nfs4_put_lock_state(prev);
2677                                 goto out;
2678                         }
2679                         spin_lock(&state->state_lock);
2680                 }
2681         }
2682         spin_unlock(&state->state_lock);
2683         nfs4_put_lock_state(prev);
2684 out:
2685         return ret;
2686 }
2687 
2688 /**
2689  * nfs41_check_open_stateid - possibly free an open stateid
2690  *
2691  * @state: NFSv4 state for an inode
2692  *
2693  * Returns NFS_OK if recovery for this stateid is now finished.
2694  * Otherwise a negative NFS4ERR value is returned.
2695  */
2696 static int nfs41_check_open_stateid(struct nfs4_state *state)
2697 {
2698         struct nfs_server *server = NFS_SERVER(state->inode);
2699         nfs4_stateid *stateid = &state->open_stateid;
2700         struct rpc_cred *cred = state->owner->so_cred;
2701         int status;
2702 
2703         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) {
2704                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)  {
2705                         if (nfs4_have_delegation(state->inode, state->state))
2706                                 return NFS_OK;
2707                         return -NFS4ERR_OPENMODE;
2708                 }
2709                 return -NFS4ERR_BAD_STATEID;
2710         }
2711         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2712         trace_nfs4_test_open_stateid(state, NULL, status);
2713         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2714                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2715                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2716                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2717                 clear_bit(NFS_OPEN_STATE, &state->flags);
2718                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2719                 return status;
2720         }
2721         if (nfs_open_stateid_recover_openmode(state))
2722                 return -NFS4ERR_OPENMODE;
2723         return NFS_OK;
2724 }
2725 
2726 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2727 {
2728         int status;
2729 
2730         nfs41_check_delegation_stateid(state);
2731         status = nfs41_check_expired_locks(state);
2732         if (status != NFS_OK)
2733                 return status;
2734         status = nfs41_check_open_stateid(state);
2735         if (status != NFS_OK)
2736                 status = nfs4_open_expired(sp, state);
2737         return status;
2738 }
2739 #endif
2740 
2741 /*
2742  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2743  * fields corresponding to attributes that were used to store the verifier.
2744  * Make sure we clobber those fields in the later setattr call
2745  */
2746 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2747                                 struct iattr *sattr, struct nfs4_label **label)
2748 {
2749         const u32 *attrset = opendata->o_res.attrset;
2750 
2751         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2752             !(sattr->ia_valid & ATTR_ATIME_SET))
2753                 sattr->ia_valid |= ATTR_ATIME;
2754 
2755         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2756             !(sattr->ia_valid & ATTR_MTIME_SET))
2757                 sattr->ia_valid |= ATTR_MTIME;
2758 
2759         /* Except MODE, it seems harmless of setting twice. */
2760         if (opendata->o_arg.createmode != NFS4_CREATE_EXCLUSIVE &&
2761                 (attrset[1] & FATTR4_WORD1_MODE ||
2762                  attrset[2] & FATTR4_WORD2_MODE_UMASK))
2763                 sattr->ia_valid &= ~ATTR_MODE;
2764 
2765         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2766                 *label = NULL;
2767 }
2768 
2769 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2770                 fmode_t fmode,
2771                 int flags,
2772                 struct nfs_open_context *ctx)
2773 {
2774         struct nfs4_state_owner *sp = opendata->owner;
2775         struct nfs_server *server = sp->so_server;
2776         struct dentry *dentry;
2777         struct nfs4_state *state;
2778         unsigned int seq;
2779         int ret;
2780 
2781         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2782 
2783         ret = _nfs4_proc_open(opendata);
2784         if (ret != 0)
2785                 goto out;
2786 
2787         state = nfs4_opendata_to_nfs4_state(opendata);
2788         ret = PTR_ERR(state);
2789         if (IS_ERR(state))
2790                 goto out;
2791         ctx->state = state;
2792         if (server->caps & NFS_CAP_POSIX_LOCK)
2793                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2794         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2795                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2796 
2797         dentry = opendata->dentry;
2798         if (d_really_is_negative(dentry)) {
2799                 struct dentry *alias;
2800                 d_drop(dentry);
2801                 alias = d_exact_alias(dentry, state->inode);
2802                 if (!alias)
2803                         alias = d_splice_alias(igrab(state->inode), dentry);
2804                 /* d_splice_alias() can't fail here - it's a non-directory */
2805                 if (alias) {
2806                         dput(ctx->dentry);
2807                         ctx->dentry = dentry = alias;
2808                 }
2809                 nfs_set_verifier(dentry,
2810                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2811         }
2812 
2813         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2814         if (ret != 0)
2815                 goto out;
2816 
2817         if (d_inode(dentry) == state->inode) {
2818                 nfs_inode_attach_open_context(ctx);
2819                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2820                         nfs4_schedule_stateid_recovery(server, state);
2821         }
2822 out:
2823         return ret;
2824 }
2825 
2826 /*
2827  * Returns a referenced nfs4_state
2828  */
2829 static int _nfs4_do_open(struct inode *dir,
2830                         struct nfs_open_context *ctx,
2831                         int flags,
2832                         const struct nfs4_open_createattrs *c,
2833                         int *opened)
2834 {
2835         struct nfs4_state_owner  *sp;
2836         struct nfs4_state     *state = NULL;
2837         struct nfs_server       *server = NFS_SERVER(dir);
2838         struct nfs4_opendata *opendata;
2839         struct dentry *dentry = ctx->dentry;
2840         struct rpc_cred *cred = ctx->cred;
2841         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2842         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2843         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2844         struct iattr *sattr = c->sattr;
2845         struct nfs4_label *label = c->label;
2846         struct nfs4_label *olabel = NULL;
2847         int status;
2848 
2849         /* Protect against reboot recovery conflicts */
2850         status = -ENOMEM;
2851         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2852         if (sp == NULL) {
2853                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2854                 goto out_err;
2855         }
2856         status = nfs4_client_recover_expired_lease(server->nfs_client);
2857         if (status != 0)
2858                 goto err_put_state_owner;
2859         if (d_really_is_positive(dentry))
2860                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2861         status = -ENOMEM;
2862         if (d_really_is_positive(dentry))
2863                 claim = NFS4_OPEN_CLAIM_FH;
2864         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
2865                         c, claim, GFP_KERNEL);
2866         if (opendata == NULL)
2867                 goto err_put_state_owner;
2868 
2869         if (label) {
2870                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2871                 if (IS_ERR(olabel)) {
2872                         status = PTR_ERR(olabel);
2873                         goto err_opendata_put;
2874                 }
2875         }
2876 
2877         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2878                 if (!opendata->f_attr.mdsthreshold) {
2879                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2880                         if (!opendata->f_attr.mdsthreshold)
2881                                 goto err_free_label;
2882                 }
2883                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2884         }
2885         if (d_really_is_positive(dentry))
2886                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2887 
2888         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2889         if (status != 0)
2890                 goto err_free_label;
2891         state = ctx->state;
2892 
2893         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2894             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2895                 nfs4_exclusive_attrset(opendata, sattr, &label);
2896                 /*
2897                  * send create attributes which was not set by open
2898                  * with an extra setattr.
2899                  */
2900                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2901                         nfs_fattr_init(opendata->o_res.f_attr);
2902                         status = nfs4_do_setattr(state->inode, cred,
2903                                         opendata->o_res.f_attr, sattr,
2904                                         ctx, label, olabel);
2905                         if (status == 0) {
2906                                 nfs_setattr_update_inode(state->inode, sattr,
2907                                                 opendata->o_res.f_attr);
2908                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2909                         }
2910                 }
2911         }
2912         if (opened && opendata->file_created)
2913                 *opened |= FILE_CREATED;
2914 
2915         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2916                 *ctx_th = opendata->f_attr.mdsthreshold;
2917                 opendata->f_attr.mdsthreshold = NULL;
2918         }
2919 
2920         nfs4_label_free(olabel);
2921 
2922         nfs4_opendata_put(opendata);
2923         nfs4_put_state_owner(sp);
2924         return 0;
2925 err_free_label:
2926         nfs4_label_free(olabel);
2927 err_opendata_put:
2928         nfs4_opendata_put(opendata);
2929 err_put_state_owner:
2930         nfs4_put_state_owner(sp);
2931 out_err:
2932         return status;
2933 }
2934 
2935 
2936 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2937                                         struct nfs_open_context *ctx,
2938                                         int flags,
2939                                         struct iattr *sattr,
2940                                         struct nfs4_label *label,
2941                                         int *opened)
2942 {
2943         struct nfs_server *server = NFS_SERVER(dir);
2944         struct nfs4_exception exception = { };
2945         struct nfs4_state *res;
2946         struct nfs4_open_createattrs c = {
2947                 .label = label,
2948                 .sattr = sattr,
2949                 .verf = {
2950                         [0] = (__u32)jiffies,
2951                         [1] = (__u32)current->pid,
2952                 },
2953         };
2954         int status;
2955 
2956         do {
2957                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
2958                 res = ctx->state;
2959                 trace_nfs4_open_file(ctx, flags, status);
2960                 if (status == 0)
2961                         break;
2962                 /* NOTE: BAD_SEQID means the server and client disagree about the
2963                  * book-keeping w.r.t. state-changing operations
2964                  * (OPEN/CLOSE/LOCK/LOCKU...)
2965                  * It is actually a sign of a bug on the client or on the server.
2966                  *
2967                  * If we receive a BAD_SEQID error in the particular case of
2968                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2969                  * have unhashed the old state_owner for us, and that we can
2970                  * therefore safely retry using a new one. We should still warn
2971                  * the user though...
2972                  */
2973                 if (status == -NFS4ERR_BAD_SEQID) {
2974                         pr_warn_ratelimited("NFS: v4 server %s "
2975                                         " returned a bad sequence-id error!\n",
2976                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2977                         exception.retry = 1;
2978                         continue;
2979                 }
2980                 /*
2981                  * BAD_STATEID on OPEN means that the server cancelled our
2982                  * state before it received the OPEN_CONFIRM.
2983                  * Recover by retrying the request as per the discussion
2984                  * on Page 181 of RFC3530.
2985                  */
2986                 if (status == -NFS4ERR_BAD_STATEID) {
2987                         exception.retry = 1;
2988                         continue;
2989                 }
2990                 if (status == -EAGAIN) {
2991                         /* We must have found a delegation */
2992                         exception.retry = 1;
2993                         continue;
2994                 }
2995                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2996                         continue;
2997                 res = ERR_PTR(nfs4_handle_exception(server,
2998                                         status, &exception));
2999         } while (exception.retry);
3000         return res;
3001 }
3002 
3003 static int _nfs4_do_setattr(struct inode *inode,
3004                             struct nfs_setattrargs *arg,
3005                             struct nfs_setattrres *res,
3006                             struct rpc_cred *cred,
3007                             struct nfs_open_context *ctx)
3008 {
3009         struct nfs_server *server = NFS_SERVER(inode);
3010         struct rpc_message msg = {
3011                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3012                 .rpc_argp       = arg,
3013                 .rpc_resp       = res,
3014                 .rpc_cred       = cred,
3015         };
3016         struct rpc_cred *delegation_cred = NULL;
3017         unsigned long timestamp = jiffies;
3018         fmode_t fmode;
3019         bool truncate;
3020         int status;
3021 
3022         nfs_fattr_init(res->fattr);
3023 
3024         /* Servers should only apply open mode checks for file size changes */
3025         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3026         fmode = truncate ? FMODE_WRITE : FMODE_READ;
3027 
3028         if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
3029                 /* Use that stateid */
3030         } else if (truncate && ctx != NULL) {
3031                 struct nfs_lock_context *l_ctx;
3032                 if (!nfs4_valid_open_stateid(ctx->state))
3033                         return -EBADF;
3034                 l_ctx = nfs_get_lock_context(ctx);
3035                 if (IS_ERR(l_ctx))
3036                         return PTR_ERR(l_ctx);
3037                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3038                                                 &arg->stateid, &delegation_cred);
3039                 nfs_put_lock_context(l_ctx);
3040                 if (status == -EIO)
3041                         return -EBADF;
3042         } else
3043                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3044         if (delegation_cred)
3045                 msg.rpc_cred = delegation_cred;
3046 
3047         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3048 
3049         put_rpccred(delegation_cred);
3050         if (status == 0 && ctx != NULL)
3051                 renew_lease(server, timestamp);
3052         trace_nfs4_setattr(inode, &arg->stateid, status);
3053         return status;
3054 }
3055 
3056 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
3057                            struct nfs_fattr *fattr, struct iattr *sattr,
3058                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3059                            struct nfs4_label *olabel)
3060 {
3061         struct nfs_server *server = NFS_SERVER(inode);
3062         struct nfs4_state *state = ctx ? ctx->state : NULL;
3063         struct nfs_setattrargs  arg = {
3064                 .fh             = NFS_FH(inode),
3065                 .iap            = sattr,
3066                 .server         = server,
3067                 .bitmask = server->attr_bitmask,
3068                 .label          = ilabel,
3069         };
3070         struct nfs_setattrres  res = {
3071                 .fattr          = fattr,
3072                 .label          = olabel,
3073                 .server         = server,
3074         };
3075         struct nfs4_exception exception = {
3076                 .state = state,
3077                 .inode = inode,
3078                 .stateid = &arg.stateid,
3079         };
3080         int err;
3081 
3082         arg.bitmask = nfs4_bitmask(server, ilabel);
3083         if (ilabel)
3084                 arg.bitmask = nfs4_bitmask(server, olabel);
3085 
3086         do {
3087                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3088                 switch (err) {
3089                 case -NFS4ERR_OPENMODE:
3090                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3091                                 pr_warn_once("NFSv4: server %s is incorrectly "
3092                                                 "applying open mode checks to "
3093                                                 "a SETATTR that is not "
3094                                                 "changing file size.\n",
3095                                                 server->nfs_client->cl_hostname);
3096                         }
3097                         if (state && !(state->state & FMODE_WRITE)) {
3098                                 err = -EBADF;
3099                                 if (sattr->ia_valid & ATTR_OPEN)
3100                                         err = -EACCES;
3101                                 goto out;
3102                         }
3103                 }
3104                 err = nfs4_handle_exception(server, err, &exception);
3105         } while (exception.retry);
3106 out:
3107         return err;
3108 }
3109 
3110 static bool
3111 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3112 {
3113         if (inode == NULL || !nfs_have_layout(inode))
3114                 return false;
3115 
3116         return pnfs_wait_on_layoutreturn(inode, task);
3117 }
3118 
3119 struct nfs4_closedata {
3120         struct inode *inode;
3121         struct nfs4_state *state;
3122         struct nfs_closeargs arg;
3123         struct nfs_closeres res;
3124         struct {
3125                 struct nfs4_layoutreturn_args arg;
3126                 struct nfs4_layoutreturn_res res;
3127                 struct nfs4_xdr_opaque_data ld_private;
3128                 u32 roc_barrier;
3129                 bool roc;
3130         } lr;
3131         struct nfs_fattr fattr;
3132         unsigned long timestamp;
3133 };
3134 
3135 static void nfs4_free_closedata(void *data)
3136 {
3137         struct nfs4_closedata *calldata = data;
3138         struct nfs4_state_owner *sp = calldata->state->owner;
3139         struct super_block *sb = calldata->state->inode->i_sb;
3140 
3141         if (calldata->lr.roc)
3142                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3143                                 calldata->res.lr_ret);
3144         nfs4_put_open_state(calldata->state);
3145         nfs_free_seqid(calldata->arg.seqid);
3146         nfs4_put_state_owner(sp);
3147         nfs_sb_deactive(sb);
3148         kfree(calldata);
3149 }
3150 
3151 static void nfs4_close_done(struct rpc_task *task, void *data)
3152 {
3153         struct nfs4_closedata *calldata = data;
3154         struct nfs4_state *state = calldata->state;
3155         struct nfs_server *server = NFS_SERVER(calldata->inode);
3156         nfs4_stateid *res_stateid = NULL;
3157         struct nfs4_exception exception = {
3158                 .state = state,
3159                 .inode = calldata->inode,
3160                 .stateid = &calldata->arg.stateid,
3161         };
3162 
3163         dprintk("%s: begin!\n", __func__);
3164         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3165                 return;
3166         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3167 
3168         /* Handle Layoutreturn errors */
3169         if (calldata->arg.lr_args && task->tk_status != 0) {
3170                 switch (calldata->res.lr_ret) {
3171                 default:
3172                         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3173                         break;
3174                 case 0:
3175                         calldata->arg.lr_args = NULL;
3176                         calldata->res.lr_res = NULL;
3177                         break;
3178                 case -NFS4ERR_OLD_STATEID:
3179                         if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid,
3180                                                 calldata->inode))
3181                                 goto lr_restart;
3182                         /* Fallthrough */
3183                 case -NFS4ERR_ADMIN_REVOKED:
3184                 case -NFS4ERR_DELEG_REVOKED:
3185                 case -NFS4ERR_EXPIRED:
3186                 case -NFS4ERR_BAD_STATEID:
3187                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
3188                 case -NFS4ERR_WRONG_CRED:
3189                         calldata->arg.lr_args = NULL;
3190                         calldata->res.lr_res = NULL;
3191                         goto lr_restart;
3192                 }
3193         }
3194 
3195         /* hmm. we are done with the inode, and in the process of freeing
3196          * the state_owner. we keep this around to process errors
3197          */
3198         switch (task->tk_status) {
3199                 case 0:
3200                         res_stateid = &calldata->res.stateid;
3201                         renew_lease(server, calldata->timestamp);
3202                         break;
3203                 case -NFS4ERR_ACCESS:
3204                         if (calldata->arg.bitmask != NULL) {
3205                                 calldata->arg.bitmask = NULL;
3206                                 calldata->res.fattr = NULL;
3207                                 goto out_restart;
3208 
3209                         }
3210                         break;
3211                 case -NFS4ERR_OLD_STATEID:
3212                         /* Did we race with OPEN? */
3213                         if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
3214                                                 state))
3215                                 goto out_restart;
3216                         goto out_release;
3217                 case -NFS4ERR_ADMIN_REVOKED:
3218                 case -NFS4ERR_STALE_STATEID:
3219                 case -NFS4ERR_EXPIRED:
3220                         nfs4_free_revoked_stateid(server,
3221                                         &calldata->arg.stateid,
3222                                         task->tk_msg.rpc_cred);
3223                         /* Fallthrough */
3224                 case -NFS4ERR_BAD_STATEID:
3225                         break;
3226                 default:
3227                         task->tk_status = nfs4_async_handle_exception(task,
3228                                         server, task->tk_status, &exception);
3229                         if (exception.retry)
3230                                 goto out_restart;
3231         }
3232         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3233                         res_stateid, calldata->arg.fmode);
3234 out_release:
3235         task->tk_status = 0;
3236         nfs_release_seqid(calldata->arg.seqid);
3237         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3238         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3239         return;
3240 lr_restart:
3241         calldata->res.lr_ret = 0;
3242 out_restart:
3243         task->tk_status = 0;
3244         rpc_restart_call_prepare(task);
3245         goto out_release;
3246 }
3247 
3248 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3249 {
3250         struct nfs4_closedata *calldata = data;
3251         struct nfs4_state *state = calldata->state;
3252         struct inode *inode = calldata->inode;
3253         bool is_rdonly, is_wronly, is_rdwr;
3254         int call_close = 0;
3255 
3256         dprintk("%s: begin!\n", __func__);
3257         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3258                 goto out_wait;
3259 
3260         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3261         spin_lock(&state->owner->so_lock);
3262         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3263         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3264         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3265         /* Calculate the change in open mode */
3266         calldata->arg.fmode = 0;
3267         if (state->n_rdwr == 0) {
3268                 if (state->n_rdonly == 0)
3269                         call_close |= is_rdonly;
3270                 else if (is_rdonly)
3271                         calldata->arg.fmode |= FMODE_READ;
3272                 if (state->n_wronly == 0)
3273                         call_close |= is_wronly;
3274                 else if (is_wronly)
3275                         calldata->arg.fmode |= FMODE_WRITE;
3276                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3277                         call_close |= is_rdwr;
3278         } else if (is_rdwr)
3279                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3280 
3281         if (!nfs4_valid_open_stateid(state) ||
3282             !nfs4_refresh_open_stateid(&calldata->arg.stateid, state))
3283                 call_close = 0;
3284         spin_unlock(&state->owner->so_lock);
3285 
3286         if (!call_close) {
3287                 /* Note: exit _without_ calling nfs4_close_done */
3288                 goto out_no_action;
3289         }
3290 
3291         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3292                 nfs_release_seqid(calldata->arg.seqid);
3293                 goto out_wait;
3294         }
3295 
3296         if (calldata->arg.fmode == 0)
3297                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3298 
3299         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3300                 /* Close-to-open cache consistency revalidation */
3301                 if (!nfs4_have_delegation(inode, FMODE_READ))
3302                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3303                 else
3304                         calldata->arg.bitmask = NULL;
3305         }
3306 
3307         calldata->arg.share_access =
3308                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3309                                 calldata->arg.fmode, 0);
3310 
3311         if (calldata->res.fattr == NULL)
3312                 calldata->arg.bitmask = NULL;
3313         else if (calldata->arg.bitmask == NULL)
3314                 calldata->res.fattr = NULL;
3315         calldata->timestamp = jiffies;
3316         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3317                                 &calldata->arg.seq_args,
3318                                 &calldata->res.seq_res,
3319                                 task) != 0)
3320                 nfs_release_seqid(calldata->arg.seqid);
3321         dprintk("%s: done!\n", __func__);
3322         return;
3323 out_no_action:
3324         task->tk_action = NULL;
3325 out_wait:
3326         nfs4_sequence_done(task, &calldata->res.seq_res);
3327 }
3328 
3329 static const struct rpc_call_ops nfs4_close_ops = {
3330         .rpc_call_prepare = nfs4_close_prepare,
3331         .rpc_call_done = nfs4_close_done,
3332         .rpc_release = nfs4_free_closedata,
3333 };
3334 
3335 /* 
3336  * It is possible for data to be read/written from a mem-mapped file 
3337  * after the sys_close call (which hits the vfs layer as a flush).
3338  * This means that we can't safely call nfsv4 close on a file until 
3339  * the inode is cleared. This in turn means that we are not good
3340  * NFSv4 citizens - we do not indicate to the server to update the file's 
3341  * share state even when we are done with one of the three share 
3342  * stateid's in the inode.
3343  *
3344  * NOTE: Caller must be holding the sp->so_owner semaphore!
3345  */
3346 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3347 {
3348         struct nfs_server *server = NFS_SERVER(state->inode);
3349         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3350         struct nfs4_closedata *calldata;
3351         struct nfs4_state_owner *sp = state->owner;
3352         struct rpc_task *task;
3353         struct rpc_message msg = {
3354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3355                 .rpc_cred = state->owner->so_cred,
3356         };
3357         struct rpc_task_setup task_setup_data = {
3358                 .rpc_client = server->client,
3359                 .rpc_message = &msg,
3360                 .callback_ops = &nfs4_close_ops,
3361                 .workqueue = nfsiod_workqueue,
3362                 .flags = RPC_TASK_ASYNC,
3363         };
3364         int status = -ENOMEM;
3365 
3366         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3367                 &task_setup_data.rpc_client, &msg);
3368 
3369         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3370         if (calldata == NULL)
3371                 goto out;
3372         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
3373         calldata->inode = state->inode;
3374         calldata->state = state;
3375         calldata->arg.fh = NFS_FH(state->inode);
3376         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3377                 goto out_free_calldata;
3378         /* Serialization for the sequence id */
3379         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3380         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3381         if (IS_ERR(calldata->arg.seqid))
3382                 goto out_free_calldata;
3383         nfs_fattr_init(&calldata->fattr);
3384         calldata->arg.fmode = 0;
3385         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3386         calldata->res.fattr = &calldata->fattr;
3387         calldata->res.seqid = calldata->arg.seqid;
3388         calldata->res.server = server;
3389         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3390         calldata->lr.roc = pnfs_roc(state->inode,
3391                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3392         if (calldata->lr.roc) {
3393                 calldata->arg.lr_args = &calldata->lr.arg;
3394                 calldata->res.lr_res = &calldata->lr.res;
3395         }
3396         nfs_sb_active(calldata->inode->i_sb);
3397 
3398         msg.rpc_argp = &calldata->arg;
3399         msg.rpc_resp = &calldata->res;
3400         task_setup_data.callback_data = calldata;
3401         task = rpc_run_task(&task_setup_data);
3402         if (IS_ERR(task))
3403                 return PTR_ERR(task);
3404         status = 0;
3405         if (wait)
3406                 status = rpc_wait_for_completion_task(task);
3407         rpc_put_task(task);
3408         return status;
3409 out_free_calldata:
3410         kfree(calldata);
3411 out:
3412         nfs4_put_open_state(state);
3413         nfs4_put_state_owner(sp);
3414         return status;
3415 }
3416 
3417 static struct inode *
3418 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3419                 int open_flags, struct iattr *attr, int *opened)
3420 {
3421         struct nfs4_state *state;
3422         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3423 
3424         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3425 
3426         /* Protect against concurrent sillydeletes */
3427         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3428 
3429         nfs4_label_release_security(label);
3430 
3431         if (IS_ERR(state))
3432                 return ERR_CAST(state);
3433         return state->inode;
3434 }
3435 
3436 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3437 {
3438         if (ctx->state == NULL)
3439                 return;
3440         if (is_sync)
3441                 nfs4_close_sync(ctx->state, ctx->mode);
3442         else
3443                 nfs4_close_state(ctx->state, ctx->mode);
3444 }
3445 
3446 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3447 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3448 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
3449 
3450 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3451 {
3452         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3453         struct nfs4_server_caps_arg args = {
3454                 .fhandle = fhandle,
3455                 .bitmask = bitmask,
3456         };
3457         struct nfs4_server_caps_res res = {};
3458         struct rpc_message msg = {
3459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3460                 .rpc_argp = &args,
3461                 .rpc_resp = &res,
3462         };
3463         int status;
3464         int i;
3465 
3466         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3467                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3468                      FATTR4_WORD0_LINK_SUPPORT |
3469                      FATTR4_WORD0_SYMLINK_SUPPORT |
3470                      FATTR4_WORD0_ACLSUPPORT;
3471         if (minorversion)
3472                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3473 
3474         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3475         if (status == 0) {
3476                 /* Sanity check the server answers */
3477                 switch (minorversion) {
3478                 case 0:
3479                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3480                         res.attr_bitmask[2] = 0;
3481                         break;
3482                 case 1:
3483                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3484                         break;
3485                 case 2:
3486                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3487                 }
3488                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3489                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3490                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3491                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3492                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3493                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3494                                 NFS_CAP_SECURITY_LABEL);
3495                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3496                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3497                         server->caps |= NFS_CAP_ACLS;
3498                 if (res.has_links != 0)
3499                         server->caps |= NFS_CAP_HARDLINKS;
3500                 if (res.has_symlinks != 0)
3501                         server->caps |= NFS_CAP_SYMLINKS;
3502                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3503                         server->caps |= NFS_CAP_FILEID;
3504                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3505                         server->caps |= NFS_CAP_MODE;
3506                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3507                         server->caps |= NFS_CAP_NLINK;
3508                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3509                         server->caps |= NFS_CAP_OWNER;
3510                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3511                         server->caps |= NFS_CAP_OWNER_GROUP;
3512                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3513                         server->caps |= NFS_CAP_ATIME;
3514                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3515                         server->caps |= NFS_CAP_CTIME;
3516                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3517                         server->caps |= NFS_CAP_MTIME;
3518 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3519                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3520                         server->caps |= NFS_CAP_SECURITY_LABEL;
3521 #endif
3522                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3523                                 sizeof(server->attr_bitmask));
3524                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3525 
3526                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3527                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3528                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3529                 server->cache_consistency_bitmask[2] = 0;
3530 
3531                 /* Avoid a regression due to buggy server */
3532                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3533                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3534                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3535                         sizeof(server->exclcreat_bitmask));
3536 
3537                 server->acl_bitmask = res.acl_bitmask;
3538                 server->fh_expire_type = res.fh_expire_type;
3539         }
3540 
3541         return status;
3542 }
3543 
3544 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3545 {
3546         struct nfs4_exception exception = { };
3547         int err;
3548         do {
3549                 err = nfs4_handle_exception(server,
3550                                 _nfs4_server_capabilities(server, fhandle),
3551                                 &exception);
3552         } while (exception.retry);
3553         return err;
3554 }
3555 
3556 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3557                 struct nfs_fsinfo *info)
3558 {
3559         u32 bitmask[3];
3560         struct nfs4_lookup_root_arg args = {
3561                 .bitmask = bitmask,
3562         };
3563         struct nfs4_lookup_res res = {
3564                 .server = server,
3565                 .fattr = info->fattr,
3566                 .fh = fhandle,
3567         };
3568         struct rpc_message msg = {
3569                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3570                 .rpc_argp = &args,
3571                 .rpc_resp = &res,
3572         };
3573 
3574         bitmask[0] = nfs4_fattr_bitmap[0];
3575         bitmask[1] = nfs4_fattr_bitmap[1];
3576         /*
3577          * Process the label in the upcoming getfattr
3578          */
3579         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3580 
3581         nfs_fattr_init(info->fattr);
3582         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3583 }
3584 
3585 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3586                 struct nfs_fsinfo *info)
3587 {
3588         struct nfs4_exception exception = { };
3589         int err;
3590         do {
3591                 err = _nfs4_lookup_root(server, fhandle, info);
3592                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3593                 switch (err) {
3594                 case 0:
3595                 case -NFS4ERR_WRONGSEC:
3596                         goto out;
3597                 default:
3598                         err = nfs4_handle_exception(server, err, &exception);
3599                 }
3600         } while (exception.retry);
3601 out:
3602         return err;
3603 }
3604 
3605 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3606                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3607 {
3608         struct rpc_auth_create_args auth_args = {
3609                 .pseudoflavor = flavor,
3610         };
3611         struct rpc_auth *auth;
3612 
3613         auth = rpcauth_create(&auth_args, server->client);
3614         if (IS_ERR(auth))
3615                 return -EACCES;
3616         return nfs4_lookup_root(server, fhandle, info);
3617 }
3618 
3619 /*
3620  * Retry pseudoroot lookup with various security flavors.  We do this when:
3621  *
3622  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3623  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3624  *
3625  * Returns zero on success, or a negative NFS4ERR value, or a
3626  * negative errno value.
3627  */
3628 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3629                               struct nfs_fsinfo *info)
3630 {
3631         /* Per 3530bis 15.33.5 */
3632         static const rpc_authflavor_t flav_array[] = {
3633                 RPC_AUTH_GSS_KRB5P,
3634                 RPC_AUTH_GSS_KRB5I,
3635                 RPC_AUTH_GSS_KRB5,
3636                 RPC_AUTH_UNIX,                  /* courtesy */
3637                 RPC_AUTH_NULL,
3638         };
3639         int status = -EPERM;
3640         size_t i;
3641 
3642         if (server->auth_info.flavor_len > 0) {
3643                 /* try each flavor specified by user */
3644                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3645                         status = nfs4_lookup_root_sec(server, fhandle, info,
3646                                                 server->auth_info.flavors[i]);
3647                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3648                                 continue;
3649                         break;
3650                 }
3651         } else {
3652                 /* no flavors specified by user, try default list */
3653                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3654                         status = nfs4_lookup_root_sec(server, fhandle, info,
3655                                                       flav_array[i]);
3656                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3657                                 continue;
3658                         break;
3659                 }
3660         }
3661 
3662         /*
3663          * -EACCESS could mean that the user doesn't have correct permissions
3664          * to access the mount.  It could also mean that we tried to mount
3665          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3666          * existing mount programs don't handle -EACCES very well so it should
3667          * be mapped to -EPERM instead.
3668          */
3669         if (status == -EACCES)
3670                 status = -EPERM;
3671         return status;
3672 }
3673 
3674 /**
3675  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3676  * @server: initialized nfs_server handle
3677  * @fhandle: we fill in the pseudo-fs root file handle
3678  * @info: we fill in an FSINFO struct
3679  * @auth_probe: probe the auth flavours
3680  *
3681  * Returns zero on success, or a negative errno.
3682  */
3683 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3684                          struct nfs_fsinfo *info,
3685                          bool auth_probe)
3686 {
3687         int status = 0;
3688 
3689         if (!auth_probe)
3690                 status = nfs4_lookup_root(server, fhandle, info);
3691 
3692         if (auth_probe || status == NFS4ERR_WRONGSEC)
3693                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3694                                 fhandle, info);
3695 
3696         if (status == 0)
3697                 status = nfs4_server_capabilities(server, fhandle);
3698         if (status == 0)
3699                 status = nfs4_do_fsinfo(server, fhandle, info);
3700 
3701         return nfs4_map_errors(status);
3702 }
3703 
3704 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3705                               struct nfs_fsinfo *info)
3706 {
3707         int error;
3708         struct nfs_fattr *fattr = info->fattr;
3709         struct nfs4_label *label = NULL;
3710 
3711         error = nfs4_server_capabilities(server, mntfh);
3712         if (error < 0) {
3713                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3714                 return error;
3715         }
3716 
3717         label = nfs4_label_alloc(server, GFP_KERNEL);
3718         if (IS_ERR(label))
3719                 return PTR_ERR(label);
3720 
3721         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3722         if (error < 0) {
3723                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3724                 goto err_free_label;
3725         }
3726 
3727         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3728             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3729                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3730 
3731 err_free_label:
3732         nfs4_label_free(label);
3733 
3734         return error;
3735 }
3736 
3737 /*
3738  * Get locations and (maybe) other attributes of a referral.
3739  * Note that we'll actually follow the referral later when
3740  * we detect fsid mismatch in inode revalidation
3741  */
3742 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3743                              const struct qstr *name, struct nfs_fattr *fattr,
3744                              struct nfs_fh *fhandle)
3745 {
3746         int status = -ENOMEM;
3747         struct page *page = NULL;
3748         struct nfs4_fs_locations *locations = NULL;
3749 
3750         page = alloc_page(GFP_KERNEL);
3751         if (page == NULL)
3752                 goto out;
3753         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3754         if (locations == NULL)
3755                 goto out;
3756 
3757         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3758         if (status != 0)
3759                 goto out;
3760 
3761         /*
3762          * If the fsid didn't change, this is a migration event, not a
3763          * referral.  Cause us to drop into the exception handler, which
3764          * will kick off migration recovery.
3765          */
3766         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3767                 dprintk("%s: server did not return a different fsid for"
3768                         " a referral at %s\n", __func__, name->name);
3769                 status = -NFS4ERR_MOVED;
3770                 goto out;
3771         }
3772         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3773         nfs_fixup_referral_attributes(&locations->fattr);
3774 
3775         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3776         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3777         memset(fhandle, 0, sizeof(struct nfs_fh));
3778 out:
3779         if (page)
3780                 __free_page(page);
3781         kfree(locations);
3782         return status;
3783 }
3784 
3785 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3786                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3787 {
3788         struct nfs4_getattr_arg args = {
3789                 .fh = fhandle,
3790                 .bitmask = server->attr_bitmask,
3791         };
3792         struct nfs4_getattr_res res = {
3793                 .fattr = fattr,
3794                 .label = label,
3795                 .server = server,
3796         };
3797         struct rpc_message msg = {
3798                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3799                 .rpc_argp = &args,
3800                 .rpc_resp = &res,
3801         };
3802 
3803         args.bitmask = nfs4_bitmask(server, label);
3804 
3805         nfs_fattr_init(fattr);
3806         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3807 }
3808 
3809 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3810                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3811 {
3812         struct nfs4_exception exception = { };
3813         int err;
3814         do {
3815                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3816                 trace_nfs4_getattr(server, fhandle, fattr, err);
3817                 err = nfs4_handle_exception(server, err,
3818                                 &exception);
3819         } while (exception.retry);
3820         return err;
3821 }
3822 
3823 /* 
3824  * The file is not closed if it is opened due to the a request to change
3825  * the size of the file. The open call will not be needed once the
3826  * VFS layer lookup-intents are implemented.
3827  *
3828  * Close is called when the inode is destroyed.
3829  * If we haven't opened the file for O_WRONLY, we
3830  * need to in the size_change case to obtain a stateid.
3831  *
3832  * Got race?
3833  * Because OPEN is always done by name in nfsv4, it is
3834  * possible that we opened a different file by the same
3835  * name.  We can recognize this race condition, but we
3836  * can't do anything about it besides returning an error.
3837  *
3838  * This will be fixed with VFS changes (lookup-intent).
3839  */
3840 static int
3841 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3842                   struct iattr *sattr)
3843 {
3844         struct inode *inode = d_inode(dentry);
3845         struct rpc_cred *cred = NULL;
3846         struct nfs_open_context *ctx = NULL;
3847         struct nfs4_label *label = NULL;
3848         int status;
3849 
3850         if (pnfs_ld_layoutret_on_setattr(inode) &&
3851             sattr->ia_valid & ATTR_SIZE &&
3852             sattr->ia_size < i_size_read(inode))
3853                 pnfs_commit_and_return_layout(inode);
3854 
3855         nfs_fattr_init(fattr);
3856         
3857         /* Deal with open(O_TRUNC) */
3858         if (sattr->ia_valid & ATTR_OPEN)
3859                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3860 
3861         /* Optimization: if the end result is no change, don't RPC */
3862         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3863                 return 0;
3864 
3865         /* Search for an existing open(O_WRITE) file */
3866         if (sattr->ia_valid & ATTR_FILE) {
3867 
3868                 ctx = nfs_file_open_context(sattr->ia_file);
3869                 if (ctx)
3870                         cred = ctx->cred;
3871         }
3872 
3873         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3874         if (IS_ERR(label))
3875                 return PTR_ERR(label);
3876 
3877         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
3878         if (status == 0) {
3879                 nfs_setattr_update_inode(inode, sattr, fattr);
3880                 nfs_setsecurity(inode, fattr, label);
3881         }
3882         nfs4_label_free(label);
3883         return status;
3884 }
3885 
3886 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3887                 const struct qstr *name, struct nfs_fh *fhandle,
3888                 struct nfs_fattr *fattr, struct nfs4_label *label)
3889 {
3890         struct nfs_server *server = NFS_SERVER(dir);
3891         int                    status;
3892         struct nfs4_lookup_arg args = {
3893                 .bitmask = server->attr_bitmask,
3894                 .dir_fh = NFS_FH(dir),
3895                 .name = name,
3896         };
3897         struct nfs4_lookup_res res = {
3898                 .server = server,
3899                 .fattr = fattr,
3900                 .label = label,
3901                 .fh = fhandle,
3902         };
3903         struct rpc_message msg = {
3904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3905                 .rpc_argp = &args,
3906                 .rpc_resp = &res,
3907         };
3908 
3909         args.bitmask = nfs4_bitmask(server, label);
3910 
3911         nfs_fattr_init(fattr);
3912 
3913         dprintk("NFS call  lookup %s\n", name->name);
3914         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3915         dprintk("NFS reply lookup: %d\n", status);
3916         return status;
3917 }
3918 
3919 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3920 {
3921         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3922                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3923         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3924         fattr->nlink = 2;
3925 }
3926 
3927 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3928                                    const struct qstr *name, struct nfs_fh *fhandle,
3929                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3930 {
3931         struct nfs4_exception exception = { };
3932         struct rpc_clnt *client = *clnt;
3933         int err;
3934         do {
3935                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3936                 trace_nfs4_lookup(dir, name, err);
3937                 switch (err) {
3938                 case -NFS4ERR_BADNAME:
3939                         err = -ENOENT;
3940                         goto out;
3941                 case -NFS4ERR_MOVED:
3942                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3943                         if (err == -NFS4ERR_MOVED)
3944                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3945                         goto out;
3946                 case -NFS4ERR_WRONGSEC:
3947                         err = -EPERM;
3948                         if (client != *clnt)
3949                                 goto out;
3950                         client = nfs4_negotiate_security(client, dir, name);
3951                         if (IS_ERR(client))
3952                                 return PTR_ERR(client);
3953 
3954                         exception.retry = 1;
3955                         break;
3956                 default:
3957                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3958                 }
3959         } while (exception.retry);
3960 
3961 out:
3962         if (err == 0)
3963                 *clnt = client;
3964         else if (client != *clnt)
3965                 rpc_shutdown_client(client);
3966 
3967         return err;
3968 }
3969 
3970 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
3971                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3972                             struct nfs4_label *label)
3973 {
3974         int status;
3975         struct rpc_clnt *client = NFS_CLIENT(dir);
3976 
3977         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3978         if (client != NFS_CLIENT(dir)) {
3979                 rpc_shutdown_client(client);
3980                 nfs_fixup_secinfo_attributes(fattr);
3981         }
3982         return status;
3983 }
3984 
3985 struct rpc_clnt *
3986 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
3987                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3988 {
3989         struct rpc_clnt *client = NFS_CLIENT(dir);
3990         int status;
3991 
3992         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3993         if (status < 0)
3994                 return ERR_PTR(status);
3995         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3996 }
3997 
3998 static int _nfs4_proc_lookupp(struct inode *inode,
3999                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4000                 struct nfs4_label *label)
4001 {
4002         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4003         struct nfs_server *server = NFS_SERVER(inode);
4004         int                    status;
4005         struct nfs4_lookupp_arg args = {
4006                 .bitmask = server->attr_bitmask,
4007                 .fh = NFS_FH(inode),
4008         };
4009         struct nfs4_lookupp_res res = {
4010                 .server = server,
4011                 .fattr = fattr,
4012                 .label = label,
4013                 .fh = fhandle,
4014         };
4015         struct rpc_message msg = {
4016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4017                 .rpc_argp = &args,
4018                 .rpc_resp = &res,
4019         };
4020 
4021         args.bitmask = nfs4_bitmask(server, label);
4022 
4023         nfs_fattr_init(fattr);
4024 
4025         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4026         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4027                                 &res.seq_res, 0);
4028         dprintk("NFS reply lookupp: %d\n", status);
4029         return status;
4030 }
4031 
4032 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4033                              struct nfs_fattr *fattr, struct nfs4_label *label)
4034 {
4035         struct nfs4_exception exception = { };
4036         int err;
4037         do {
4038                 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4039                 trace_nfs4_lookupp(inode, err);
4040                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4041                                 &exception);
4042         } while (exception.retry);
4043         return err;
4044 }
4045 
4046 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4047 {
4048         struct nfs_server *server = NFS_SERVER(inode);
4049         struct nfs4_accessargs args = {
4050                 .fh = NFS_FH(inode),
4051                 .bitmask = server->cache_consistency_bitmask,
4052                 .access = entry->mask,
4053         };
4054         struct nfs4_accessres res = {
4055                 .server = server,
4056         };
4057         struct rpc_message msg = {
4058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4059                 .rpc_argp = &args,
4060                 .rpc_resp = &res,
4061                 .rpc_cred = entry->cred,
4062         };
4063         int status = 0;
4064 
4065         res.fattr = nfs_alloc_fattr();
4066         if (res.fattr == NULL)
4067                 return -ENOMEM;
4068 
4069         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4070         if (!status) {
4071                 nfs_access_set_mask(entry, res.access);
4072                 nfs_refresh_inode(inode, res.fattr);
4073         }
4074         nfs_free_fattr(res.fattr);
4075         return status;
4076 }
4077 
4078 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4079 {
4080         struct nfs4_exception exception = { };
4081         int err;
4082         do {
4083                 err = _nfs4_proc_access(inode, entry);
4084                 trace_nfs4_access(inode, err);
4085                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4086                                 &exception);
4087         } while (exception.retry);
4088         return err;
4089 }
4090 
4091 /*
4092  * TODO: For the time being, we don't try to get any attributes
4093  * along with any of the zero-copy operations READ, READDIR,
4094  * READLINK, WRITE.
4095  *
4096  * In the case of the first three, we want to put the GETATTR
4097  * after the read-type operation -- this is because it is hard
4098  * to predict the length of a GETATTR response in v4, and thus
4099  * align the READ data correctly.  This means that the GETATTR
4100  * may end up partially falling into the page cache, and we should
4101  * shift it into the 'tail' of the xdr_buf before processing.
4102  * To do this efficiently, we need to know the total length
4103  * of data received, which doesn't seem to be available outside
4104  * of the RPC layer.
4105  *
4106  * In the case of WRITE, we also want to put the GETATTR after
4107  * the operation -- in this case because we want to make sure
4108  * we get the post-operation mtime and size.
4109  *
4110  * Both of these changes to the XDR layer would in fact be quite
4111  * minor, but I decided to leave them for a subsequent patch.
4112  */
4113 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4114                 unsigned int pgbase, unsigned int pglen)
4115 {
4116         struct nfs4_readlink args = {
4117                 .fh       = NFS_FH(inode),
4118                 .pgbase   = pgbase,
4119                 .pglen    = pglen,
4120                 .pages    = &page,
4121         };
4122         struct nfs4_readlink_res res;
4123         struct rpc_message msg = {
4124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4125                 .rpc_argp = &args,
4126                 .rpc_resp = &res,
4127         };
4128 
4129         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4130 }
4131 
4132 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4133                 unsigned int pgbase, unsigned int pglen)
4134 {
4135         struct nfs4_exception exception = { };
4136         int err;
4137         do {
4138                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4139                 trace_nfs4_readlink(inode, err);
4140                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4141                                 &exception);
4142         } while (exception.retry);
4143         return err;
4144 }
4145 
4146 /*
4147  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4148  */
4149 static int
4150 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4151                  int flags)
4152 {
4153         struct nfs_server *server = NFS_SERVER(dir);
4154         struct nfs4_label l, *ilabel = NULL;
4155         struct nfs_open_context *ctx;
4156         struct nfs4_state *state;
4157         int status = 0;
4158 
4159         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4160         if (IS_ERR(ctx))
4161                 return PTR_ERR(ctx);
4162 
4163         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4164 
4165         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4166                 sattr->ia_mode &= ~current_umask();
4167         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4168         if (IS_ERR(state)) {
4169                 status = PTR_ERR(state);
4170                 goto out;
4171         }
4172 out:
4173         nfs4_label_release_security(ilabel);
4174         put_nfs_open_context(ctx);
4175         return status;
4176 }
4177 
4178 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name)
4179 {
4180         struct nfs_server *server = NFS_SERVER(dir);
4181         struct nfs_removeargs args = {
4182                 .fh = NFS_FH(dir),
4183                 .name = *name,
4184         };
4185         struct nfs_removeres res = {
4186                 .server = server,
4187         };
4188         struct rpc_message msg = {
4189                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4190                 .rpc_argp = &args,
4191                 .rpc_resp = &res,
4192         };
4193         unsigned long timestamp = jiffies;
4194         int status;
4195 
4196         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4197         if (status == 0)
4198                 update_changeattr(dir, &res.cinfo, timestamp);
4199         return status;
4200 }
4201 
4202 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name)
4203 {
4204         struct nfs4_exception exception = { };
4205         int err;
4206         do {
4207                 err = _nfs4_proc_remove(dir, name);
4208                 trace_nfs4_remove(dir, name, err);
4209                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4210                                 &exception);
4211         } while (exception.retry);
4212         return err;
4213 }
4214 
4215 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
4216 {
4217         struct nfs_server *server = NFS_SERVER(dir);
4218         struct nfs_removeargs *args = msg->rpc_argp;
4219         struct nfs_removeres *res = msg->rpc_resp;
4220 
4221         res->server = server;
4222         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4223         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
4224 
4225         nfs_fattr_init(res->dir_attr);
4226 }
4227 
4228 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4229 {
4230         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4231                         &data->args.seq_args,
4232                         &data->res.seq_res,
4233                         task);
4234 }
4235 
4236 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4237 {
4238         struct nfs_unlinkdata *data = task->tk_calldata;
4239         struct nfs_removeres *res = &data->res;
4240 
4241         if (!nfs4_sequence_done(task, &res->seq_res))
4242                 return 0;
4243         if (nfs4_async_handle_error(task, res->server, NULL,
4244                                     &data->timeout) == -EAGAIN)
4245                 return 0;
4246         if (task->tk_status == 0)
4247                 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start);
4248         return 1;
4249 }
4250 
4251 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
4252 {
4253         struct nfs_server *server = NFS_SERVER(dir);
4254         struct nfs_renameargs *arg = msg->rpc_argp;
4255         struct nfs_renameres *res = msg->rpc_resp;
4256 
4257         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4258         res->server = server;
4259         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
4260 }
4261 
4262 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4263 {
4264         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4265                         &data->args.seq_args,
4266                         &data->res.seq_res,
4267                         task);
4268 }
4269 
4270 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4271                                  struct inode *new_dir)
4272 {
4273         struct nfs_renamedata *data = task->tk_calldata;
4274         struct nfs_renameres *res = &data->res;
4275 
4276         if (!nfs4_sequence_done(task, &res->seq_res))
4277                 return 0;
4278         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4279                 return 0;
4280 
4281         if (task->tk_status == 0) {
4282                 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start);
4283                 if (new_dir != old_dir)
4284                         update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start);
4285         }
4286         return 1;
4287 }
4288 
4289 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4290 {
4291         struct nfs_server *server = NFS_SERVER(inode);
4292         struct nfs4_link_arg arg = {
4293                 .fh     = NFS_FH(inode),
4294                 .dir_fh = NFS_FH(dir),
4295                 .name   = name,
4296                 .bitmask = server->attr_bitmask,
4297         };
4298         struct nfs4_link_res res = {
4299                 .server = server,
4300                 .label = NULL,
4301         };
4302         struct rpc_message msg = {
4303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4304                 .rpc_argp = &arg,
4305                 .rpc_resp = &res,
4306         };
4307         int status = -ENOMEM;
4308 
4309         res.fattr = nfs_alloc_fattr();
4310         if (res.fattr == NULL)
4311                 goto out;
4312 
4313         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4314         if (IS_ERR(res.label)) {
4315                 status = PTR_ERR(res.label);
4316                 goto out;
4317         }
4318         arg.bitmask = nfs4_bitmask(server, res.label);
4319 
4320         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4321         if (!status) {
4322                 update_changeattr(dir, &res.cinfo, res.fattr->time_start);
4323                 status = nfs_post_op_update_inode(inode, res.fattr);
4324                 if (!status)
4325                         nfs_setsecurity(inode, res.fattr, res.label);
4326         }
4327 
4328 
4329         nfs4_label_free(res.label);
4330 
4331 out:
4332         nfs_free_fattr(res.fattr);
4333         return status;
4334 }
4335 
4336 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4337 {
4338         struct nfs4_exception exception = { };
4339         int err;
4340         do {
4341                 err = nfs4_handle_exception(NFS_SERVER(inode),
4342                                 _nfs4_proc_link(inode, dir, name),
4343                                 &exception);
4344         } while (exception.retry);
4345         return err;
4346 }
4347 
4348 struct nfs4_createdata {
4349         struct rpc_message msg;
4350         struct nfs4_create_arg arg;
4351         struct nfs4_create_res res;
4352         struct nfs_fh fh;
4353         struct nfs_fattr fattr;
4354         struct nfs4_label *label;
4355 };
4356 
4357 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4358                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4359 {
4360         struct nfs4_createdata *data;
4361 
4362         data = kzalloc(sizeof(*data), GFP_KERNEL);
4363         if (data != NULL) {
4364                 struct nfs_server *server = NFS_SERVER(dir);
4365 
4366                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4367                 if (IS_ERR(data->label))
4368                         goto out_free;
4369 
4370                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4371                 data->msg.rpc_argp = &data->arg;
4372                 data->msg.rpc_resp = &data->res;
4373                 data->arg.dir_fh = NFS_FH(dir);
4374                 data->arg.server = server;
4375                 data->arg.name = name;
4376                 data->arg.attrs = sattr;
4377                 data->arg.ftype = ftype;
4378                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4379                 data->arg.umask = current_umask();
4380                 data->res.server = server;
4381                 data->res.fh = &data->fh;
4382                 data->res.fattr = &data->fattr;
4383                 data->res.label = data->label;
4384                 nfs_fattr_init(data->res.fattr);
4385         }
4386         return data;
4387 out_free:
4388         kfree(data);
4389         return NULL;
4390 }
4391 
4392 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4393 {
4394         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4395                                     &data->arg.seq_args, &data->res.seq_res, 1);
4396         if (status == 0) {
4397                 update_changeattr(dir, &data->res.dir_cinfo,
4398                                 data->res.fattr->time_start);
4399                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4400         }
4401         return status;
4402 }
4403 
4404 static void nfs4_free_createdata(struct nfs4_createdata *data)
4405 {
4406         nfs4_label_free(data->label);
4407         kfree(data);
4408 }
4409 
4410 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4411                 struct page *page, unsigned int len, struct iattr *sattr,
4412                 struct nfs4_label *label)
4413 {
4414         struct nfs4_createdata *data;
4415         int status = -ENAMETOOLONG;
4416 
4417         if (len > NFS4_MAXPATHLEN)
4418                 goto out;
4419 
4420         status = -ENOMEM;
4421         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4422         if (data == NULL)
4423                 goto out;
4424 
4425         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4426         data->arg.u.symlink.pages = &page;
4427         data->arg.u.symlink.len = len;
4428         data->arg.label = label;
4429         
4430         status = nfs4_do_create(dir, dentry, data);
4431 
4432         nfs4_free_createdata(data);
4433 out:
4434         return status;
4435 }
4436 
4437 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4438                 struct page *page, unsigned int len, struct iattr *sattr)
4439 {
4440         struct nfs4_exception exception = { };
4441         struct nfs4_label l, *label = NULL;
4442         int err;
4443 
4444         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4445 
4446         do {
4447                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4448                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4449                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4450                                 &exception);
4451         } while (exception.retry);
4452 
4453         nfs4_label_release_security(label);
4454         return err;
4455 }
4456 
4457 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4458                 struct iattr *sattr, struct nfs4_label *label)
4459 {
4460         struct nfs4_createdata *data;
4461         int status = -ENOMEM;
4462 
4463         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4464         if (data == NULL)
4465                 goto out;
4466 
4467         data->arg.label = label;
4468         status = nfs4_do_create(dir, dentry, data);
4469 
4470         nfs4_free_createdata(data);
4471 out:
4472         return status;
4473 }
4474 
4475 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4476                 struct iattr *sattr)
4477 {
4478         struct nfs_server *server = NFS_SERVER(dir);
4479         struct nfs4_exception exception = { };
4480         struct nfs4_label l, *label = NULL;
4481         int err;
4482 
4483         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4484 
4485         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4486                 sattr->ia_mode &= ~current_umask();
4487         do {
4488                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4489                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4490                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4491                                 &exception);
4492         } while (exception.retry);
4493         nfs4_label_release_security(label);
4494 
4495         return err;
4496 }
4497 
4498 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4499                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4500 {
4501         struct inode            *dir = d_inode(dentry);
4502         struct nfs4_readdir_arg args = {
4503                 .fh = NFS_FH(dir),
4504                 .pages = pages,
4505                 .pgbase = 0,
4506                 .count = count,
4507                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4508                 .plus = plus,
4509         };
4510         struct nfs4_readdir_res res;
4511         struct rpc_message msg = {
4512                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4513                 .rpc_argp = &args,
4514                 .rpc_resp = &res,
4515                 .rpc_cred = cred,
4516         };
4517         int                     status;
4518 
4519         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4520                         dentry,
4521                         (unsigned long long)cookie);
4522         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4523         res.pgbase = args.pgbase;
4524         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4525         if (status >= 0) {
4526                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4527                 status += args.pgbase;
4528         }
4529 
4530         nfs_invalidate_atime(dir);
4531 
4532         dprintk("%s: returns %d\n", __func__, status);
4533         return status;
4534 }
4535 
4536 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4537                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4538 {
4539         struct nfs4_exception exception = { };
4540         int err;
4541         do {
4542                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4543                                 pages, count, plus);
4544                 trace_nfs4_readdir(d_inode(dentry), err);
4545                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4546                                 &exception);
4547         } while (exception.retry);
4548         return err;
4549 }
4550 
4551 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4552                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4553 {
4554         struct nfs4_createdata *data;
4555         int mode = sattr->ia_mode;
4556         int status = -ENOMEM;
4557 
4558         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4559         if (data == NULL)
4560                 goto out;
4561 
4562         if (S_ISFIFO(mode))
4563                 data->arg.ftype = NF4FIFO;
4564         else if (S_ISBLK(mode)) {
4565                 data->arg.ftype = NF4BLK;
4566                 data->arg.u.device.specdata1 = MAJOR(rdev);
4567                 data->arg.u.device.specdata2 = MINOR(rdev);
4568         }
4569         else if (S_ISCHR(mode)) {
4570                 data->arg.ftype = NF4CHR;
4571                 data->arg.u.device.specdata1 = MAJOR(rdev);
4572                 data->arg.u.device.specdata2 = MINOR(rdev);
4573         } else if (!S_ISSOCK(mode)) {
4574                 status = -EINVAL;
4575                 goto out_free;
4576         }
4577 
4578         data->arg.label = label;
4579         status = nfs4_do_create(dir, dentry, data);
4580 out_free:
4581         nfs4_free_createdata(data);
4582 out:
4583         return status;
4584 }
4585 
4586 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4587                 struct iattr *sattr, dev_t rdev)
4588 {
4589         struct nfs_server *server = NFS_SERVER(dir);
4590         struct nfs4_exception exception = { };
4591         struct nfs4_label l, *label = NULL;
4592         int err;
4593 
4594         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4595 
4596         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4597                 sattr->ia_mode &= ~current_umask();
4598         do {
4599                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4600                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4601                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4602                                 &exception);
4603         } while (exception.retry);
4604 
4605         nfs4_label_release_security(label);
4606 
4607         return err;
4608 }
4609 
4610 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4611                  struct nfs_fsstat *fsstat)
4612 {
4613         struct nfs4_statfs_arg args = {
4614                 .fh = fhandle,
4615                 .bitmask = server->attr_bitmask,
4616         };
4617         struct nfs4_statfs_res res = {
4618                 .fsstat = fsstat,
4619         };
4620         struct rpc_message msg = {
4621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4622                 .rpc_argp = &args,
4623                 .rpc_resp = &res,
4624         };
4625 
4626         nfs_fattr_init(fsstat->fattr);
4627         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4628 }
4629 
4630 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4631 {
4632         struct nfs4_exception exception = { };
4633         int err;
4634         do {
4635                 err = nfs4_handle_exception(server,
4636                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4637                                 &exception);
4638         } while (exception.retry);
4639         return err;
4640 }
4641 
4642 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4643                 struct nfs_fsinfo *fsinfo)
4644 {
4645         struct nfs4_fsinfo_arg args = {
4646                 .fh = fhandle,
4647                 .bitmask = server->attr_bitmask,
4648         };
4649         struct nfs4_fsinfo_res res = {
4650                 .fsinfo = fsinfo,
4651         };
4652         struct rpc_message msg = {
4653                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4654                 .rpc_argp = &args,
4655                 .rpc_resp = &res,
4656         };
4657 
4658         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4659 }
4660 
4661 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4662 {
4663         struct nfs4_exception exception = { };
4664         unsigned long now = jiffies;
4665         int err;
4666 
4667         do {
4668                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4669                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4670                 if (err == 0) {
4671                         nfs4_set_lease_period(server->nfs_client,
4672                                         fsinfo->lease_time * HZ,
4673                                         now);
4674                         break;
4675                 }
4676                 err = nfs4_handle_exception(server, err, &exception);
4677         } while (exception.retry);
4678         return err;
4679 }
4680 
4681 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4682 {
4683         int error;
4684 
4685         nfs_fattr_init(fsinfo->fattr);
4686         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4687         if (error == 0) {
4688                 /* block layout checks this! */
4689                 server->pnfs_blksize = fsinfo->blksize;
4690                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4691         }
4692 
4693         return error;
4694 }
4695 
4696 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4697                 struct nfs_pathconf *pathconf)
4698 {
4699         struct nfs4_pathconf_arg args = {
4700                 .fh = fhandle,
4701                 .bitmask = server->attr_bitmask,
4702         };
4703         struct nfs4_pathconf_res res = {
4704                 .pathconf = pathconf,
4705         };
4706         struct rpc_message msg = {
4707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4708                 .rpc_argp = &args,
4709                 .rpc_resp = &res,
4710         };
4711 
4712         /* None of the pathconf attributes are mandatory to implement */
4713         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4714                 memset(pathconf, 0, sizeof(*pathconf));
4715                 return 0;
4716         }
4717 
4718         nfs_fattr_init(pathconf->fattr);
4719         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4720 }
4721 
4722 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4723                 struct nfs_pathconf *pathconf)
4724 {
4725         struct nfs4_exception exception = { };
4726         int err;
4727 
4728         do {
4729                 err = nfs4_handle_exception(server,
4730                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4731                                 &exception);
4732         } while (exception.retry);
4733         return err;
4734 }
4735 
4736 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4737                 const struct nfs_open_context *ctx,
4738                 const struct nfs_lock_context *l_ctx,
4739                 fmode_t fmode)
4740 {
4741         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
4742 }
4743 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4744 
4745 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4746                 const struct nfs_open_context *ctx,
4747                 const struct nfs_lock_context *l_ctx,
4748                 fmode_t fmode)
4749 {
4750         nfs4_stateid current_stateid;
4751 
4752         /* If the current stateid represents a lost lock, then exit */
4753         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4754                 return true;
4755         return nfs4_stateid_match(stateid, &current_stateid);
4756 }
4757 
4758 static bool nfs4_error_stateid_expired(int err)
4759 {
4760         switch (err) {
4761         case -NFS4ERR_DELEG_REVOKED:
4762         case -NFS4ERR_ADMIN_REVOKED:
4763         case -NFS4ERR_BAD_STATEID:
4764         case -NFS4ERR_STALE_STATEID:
4765         case -NFS4ERR_OLD_STATEID:
4766         case -NFS4ERR_OPENMODE:
4767         case -NFS4ERR_EXPIRED:
4768                 return true;
4769         }
4770         return false;
4771 }
4772 
4773 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4774 {
4775         struct nfs_server *server = NFS_SERVER(hdr->inode);
4776 
4777         trace_nfs4_read(hdr, task->tk_status);
4778         if (task->tk_status < 0) {
4779                 struct nfs4_exception exception = {
4780                         .inode = hdr->inode,
4781                         .state = hdr->args.context->state,
4782                         .stateid = &hdr->args.stateid,
4783                 };
4784                 task->tk_status = nfs4_async_handle_exception(task,
4785                                 server, task->tk_status, &exception);
4786                 if (exception.retry) {
4787                         rpc_restart_call_prepare(task);
4788                         return -EAGAIN;
4789                 }
4790         }
4791 
4792         if (task->tk_status > 0)
4793                 renew_lease(server, hdr->timestamp);
4794         return 0;
4795 }
4796 
4797 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4798                 struct nfs_pgio_args *args)
4799 {
4800 
4801         if (!nfs4_error_stateid_expired(task->tk_status) ||
4802                 nfs4_stateid_is_current(&args->stateid,
4803                                 args->context,
4804                                 args->lock_context,
4805                                 FMODE_READ))
4806                 return false;
4807         rpc_restart_call_prepare(task);
4808         return true;
4809 }
4810 
4811 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4812 {
4813 
4814         dprintk("--> %s\n", __func__);
4815 
4816         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4817                 return -EAGAIN;
4818         if (nfs4_read_stateid_changed(task, &hdr->args))
4819                 return -EAGAIN;
4820         if (task->tk_status > 0)
4821                 nfs_invalidate_atime(hdr->inode);
4822         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4823                                     nfs4_read_done_cb(task, hdr);
4824 }
4825 
4826 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4827                                  struct rpc_message *msg)
4828 {
4829         hdr->timestamp   = jiffies;
4830         if (!hdr->pgio_done_cb)
4831                 hdr->pgio_done_cb = nfs4_read_done_cb;
4832         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4833         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4834 }
4835 
4836 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4837                                       struct nfs_pgio_header *hdr)
4838 {
4839         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
4840                         &hdr->args.seq_args,
4841                         &hdr->res.seq_res,
4842                         task))
4843                 return 0;
4844         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4845                                 hdr->args.lock_context,
4846                                 hdr->rw_mode) == -EIO)
4847                 return -EIO;
4848         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4849                 return -EIO;
4850         return 0;
4851 }
4852 
4853 static int nfs4_write_done_cb(struct rpc_task *task,
4854                               struct nfs_pgio_header *hdr)
4855 {
4856         struct inode *inode = hdr->inode;
4857 
4858         trace_nfs4_write(hdr, task->tk_status);
4859         if (task->tk_status < 0) {
4860                 struct nfs4_exception exception = {
4861                         .inode = hdr->inode,
4862                         .state = hdr->args.context->state,
4863                         .stateid = &hdr->args.stateid,
4864                 };
4865                 task->tk_status = nfs4_async_handle_exception(task,
4866                                 NFS_SERVER(inode), task->tk_status,
4867                                 &exception);
4868                 if (exception.retry) {
4869                         rpc_restart_call_prepare(task);
4870                         return -EAGAIN;
4871                 }
4872         }
4873         if (task->tk_status >= 0) {
4874                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4875                 nfs_writeback_update_inode(hdr);
4876         }
4877         return 0;
4878 }
4879 
4880 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4881                 struct nfs_pgio_args *args)
4882 {
4883 
4884         if (!nfs4_error_stateid_expired(task->tk_status) ||
4885                 nfs4_stateid_is_current(&args->stateid,
4886                                 args->context,
4887                                 args->lock_context,
4888                                 FMODE_WRITE))
4889                 return false;
4890         rpc_restart_call_prepare(task);
4891         return true;
4892 }
4893 
4894 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4895 {
4896         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4897                 return -EAGAIN;
4898         if (nfs4_write_stateid_changed(task, &hdr->args))
4899                 return -EAGAIN;
4900         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4901                 nfs4_write_done_cb(task, hdr);
4902 }
4903 
4904 static
4905 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4906 {
4907         /* Don't request attributes for pNFS or O_DIRECT writes */
4908         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4909                 return false;
4910         /* Otherwise, request attributes if and only if we don't hold
4911          * a delegation
4912          */
4913         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4914 }
4915 
4916 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4917                                   struct rpc_message *msg)
4918 {
4919         struct nfs_server *server = NFS_SERVER(hdr->inode);
4920 
4921         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4922                 hdr->args.bitmask = NULL;
4923                 hdr->res.fattr = NULL;
4924         } else
4925                 hdr->args.bitmask = server->cache_consistency_bitmask;
4926 
4927         if (!hdr->pgio_done_cb)
4928                 hdr->pgio_done_cb = nfs4_write_done_cb;
4929         hdr->res.server = server;
4930         hdr->timestamp   = jiffies;
4931 
4932         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4933         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4934 }
4935 
4936 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4937 {
4938         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
4939                         &data->args.seq_args,
4940                         &data->res.seq_res,
4941                         task);
4942 }
4943 
4944 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4945 {
4946         struct inode *inode = data->inode;
4947 
4948         trace_nfs4_commit(data, task->tk_status);
4949         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4950                                     NULL, NULL) == -EAGAIN) {
4951                 rpc_restart_call_prepare(task);
4952                 return -EAGAIN;
4953         }
4954         return 0;
4955 }
4956 
4957 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4958 {
4959         if (!nfs4_sequence_done(task, &data->res.seq_res))
4960                 return -EAGAIN;
4961         return data->commit_done_cb(task, data);
4962 }
4963 
4964 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4965 {
4966         struct nfs_server *server = NFS_SERVER(data->inode);
4967 
4968         if (data->commit_done_cb == NULL)
4969                 data->commit_done_cb = nfs4_commit_done_cb;
4970         data->res.server = server;
4971         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4972         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4973 }
4974 
4975 struct nfs4_renewdata {
4976         struct nfs_client       *client;
4977         unsigned long           timestamp;
4978 };
4979 
4980 /*
4981  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4982  * standalone procedure for queueing an asynchronous RENEW.
4983  */
4984 static void nfs4_renew_release(void *calldata)
4985 {
4986         struct nfs4_renewdata *data = calldata;
4987         struct nfs_client *clp = data->client;
4988 
4989         if (refcount_read(&clp->cl_count) > 1)
4990                 nfs4_schedule_state_renewal(clp);
4991         nfs_put_client(clp);
4992         kfree(data);
4993 }
4994 
4995 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4996 {
4997         struct nfs4_renewdata *data = calldata;
4998         struct nfs_client *clp = data->client;
4999         unsigned long timestamp = data->timestamp;
5000 
5001         trace_nfs4_renew_async(clp, task->tk_status);
5002         switch (task->tk_status) {
5003         case 0:
5004                 break;
5005         case -NFS4ERR_LEASE_MOVED:
5006                 nfs4_schedule_lease_moved_recovery(clp);
5007                 break;
5008         default:
5009                 /* Unless we're shutting down, schedule state recovery! */
5010                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5011                         return;
5012                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5013                         nfs4_schedule_lease_recovery(clp);
5014                         return;
5015                 }
5016                 nfs4_schedule_path_down_recovery(clp);
5017         }
5018         do_renew_lease(clp, timestamp);
5019 }
5020 
5021 static const struct rpc_call_ops nfs4_renew_ops = {
5022         .rpc_call_done = nfs4_renew_done,
5023         .rpc_release = nfs4_renew_release,
5024 };
5025 
5026 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5027 {
5028         struct rpc_message msg = {
5029                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5030                 .rpc_argp       = clp,
5031                 .rpc_cred       = cred,
5032         };
5033         struct nfs4_renewdata *data;
5034 
5035         if (renew_flags == 0)
5036                 return 0;
5037         if (!refcount_inc_not_zero(&clp->cl_count))
5038                 return -EIO;
5039         data = kmalloc(sizeof(*data), GFP_NOFS);
5040         if (data == NULL) {
5041                 nfs_put_client(clp);
5042                 return -ENOMEM;
5043         }
5044         data->client = clp;
5045         data->timestamp = jiffies;
5046         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5047                         &nfs4_renew_ops, data);
5048 }
5049 
5050 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
5051 {
5052         struct rpc_message msg = {
5053                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5054                 .rpc_argp       = clp,
5055                 .rpc_cred       = cred,
5056         };
5057         unsigned long now = jiffies;
5058         int status;
5059 
5060         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5061         if (status < 0)
5062                 return status;
5063         do_renew_lease(clp, now);
5064         return 0;
5065 }
5066 
5067 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5068 {
5069         return server->caps & NFS_CAP_ACLS;
5070 }
5071 
5072 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5073  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5074  * the stack.
5075  */
5076 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5077 
5078 static int buf_to_pages_noslab(const void *buf, size_t buflen,
5079                 struct page **pages)
5080 {
5081         struct page *newpage, **spages;
5082         int rc = 0;
5083         size_t len;
5084         spages = pages;
5085 
5086         do {
5087                 len = min_t(size_t, PAGE_SIZE, buflen);
5088                 newpage = alloc_page(GFP_KERNEL);
5089 
5090                 if (newpage == NULL)
5091                         goto unwind;
5092                 memcpy(page_address(newpage), buf, len);
5093                 buf += len;
5094                 buflen -= len;
5095                 *pages++ = newpage;
5096                 rc++;
5097         } while (buflen != 0);
5098 
5099         return rc;
5100 
5101 unwind:
5102         for(; rc > 0; rc--)
5103                 __free_page(spages[rc-1]);
5104         return -ENOMEM;
5105 }
5106 
5107 struct nfs4_cached_acl {
5108         int cached;
5109         size_t len;
5110         char data[0];
5111 };
5112 
5113 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5114 {
5115         struct nfs_inode *nfsi = NFS_I(inode);
5116 
5117         spin_lock(&inode->i_lock);
5118         kfree(nfsi->nfs4_acl);
5119         nfsi->nfs4_acl = acl;
5120         spin_unlock(&inode->i_lock);
5121 }
5122 
5123 static void nfs4_zap_acl_attr(struct inode *inode)
5124 {
5125         nfs4_set_cached_acl(inode, NULL);
5126 }
5127 
5128 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5129 {
5130         struct nfs_inode *nfsi = NFS_I(inode);
5131         struct nfs4_cached_acl *acl;
5132         int ret = -ENOENT;
5133 
5134         spin_lock(&inode->i_lock);
5135         acl = nfsi->nfs4_acl;
5136         if (acl == NULL)
5137                 goto out;
5138         if (buf == NULL) /* user is just asking for length */
5139                 goto out_len;
5140         if (acl->cached == 0)
5141                 goto out;
5142         ret = -ERANGE; /* see getxattr(2) man page */
5143         if (acl->len > buflen)
5144                 goto out;
5145         memcpy(buf, acl->data, acl->len);
5146 out_len:
5147         ret = acl->len;
5148 out:
5149         spin_unlock(&inode->i_lock);
5150         return ret;
5151 }
5152 
5153 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5154 {
5155         struct nfs4_cached_acl *acl;
5156         size_t buflen = sizeof(*acl) + acl_len;
5157 
5158         if (buflen <= PAGE_SIZE) {
5159                 acl = kmalloc(buflen, GFP_KERNEL);
5160                 if (acl == NULL)
5161                         goto out;
5162                 acl->cached = 1;
5163                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5164         } else {
5165                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5166                 if (acl == NULL)
5167                         goto out;
5168                 acl->cached = 0;
5169         }
5170         acl->len = acl_len;
5171 out:
5172         nfs4_set_cached_acl(inode, acl);
5173 }
5174 
5175 /*
5176  * The getxattr API returns the required buffer length when called with a
5177  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5178  * the required buf.  On a NULL buf, we send a page of data to the server
5179  * guessing that the ACL request can be serviced by a page. If so, we cache
5180  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5181  * the cache. If not so, we throw away the page, and cache the required
5182  * length. The next getxattr call will then produce another round trip to
5183  * the server, this time with the input buf of the required size.
5184  */
5185 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5186 {
5187         struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, };
5188         struct nfs_getaclargs args = {
5189                 .fh = NFS_FH(inode),
5190                 .acl_pages = pages,
5191                 .acl_len = buflen,
5192         };
5193         struct nfs_getaclres res = {
5194                 .acl_len = buflen,
5195         };
5196         struct rpc_message msg = {
5197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5198                 .rpc_argp = &args,
5199                 .rpc_resp = &res,
5200         };
5201         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5202         int ret = -ENOMEM, i;
5203 
5204         if (npages > ARRAY_SIZE(pages))
5205                 return -ERANGE;
5206 
5207         for (i = 0; i < npages; i++) {
5208                 pages[i] = alloc_page(GFP_KERNEL);
5209                 if (!pages[i])
5210                         goto out_free;
5211         }
5212 
5213         /* for decoding across pages */
5214         res.acl_scratch = alloc_page(GFP_KERNEL);
5215         if (!res.acl_scratch)
5216                 goto out_free;
5217 
5218         args.acl_len = npages * PAGE_SIZE;
5219 
5220         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5221                 __func__, buf, buflen, npages, args.acl_len);
5222         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5223                              &msg, &args.seq_args, &res.seq_res, 0);
5224         if (ret)
5225                 goto out_free;
5226 
5227         /* Handle the case where the passed-in buffer is too short */
5228         if (res.acl_flags & NFS4_ACL_TRUNC) {
5229                 /* Did the user only issue a request for the acl length? */
5230                 if (buf == NULL)
5231                         goto out_ok;
5232                 ret = -ERANGE;
5233                 goto out_free;
5234         }
5235         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5236         if (buf) {
5237                 if (res.acl_len > buflen) {
5238                         ret = -ERANGE;
5239                         goto out_free;
5240                 }
5241                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5242         }
5243 out_ok:
5244         ret = res.acl_len;
5245 out_free:
5246         for (i = 0; i < npages; i++)
5247                 if (pages[i])
5248                         __free_page(pages[i]);
5249         if (res.acl_scratch)
5250                 __free_page(res.acl_scratch);
5251         return ret;
5252 }
5253 
5254 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5255 {
5256         struct nfs4_exception exception = { };
5257         ssize_t ret;
5258         do {
5259                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5260                 trace_nfs4_get_acl(inode, ret);
5261                 if (ret >= 0)
5262                         break;
5263                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5264         } while (exception.retry);
5265         return ret;
5266 }
5267 
5268 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5269 {
5270         struct nfs_server *server = NFS_SERVER(inode);
5271         int ret;
5272 
5273         if (!nfs4_server_supports_acls(server))
5274                 return -EOPNOTSUPP;
5275         ret = nfs_revalidate_inode(server, inode);
5276         if (ret < 0)
5277                 return ret;
5278         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5279                 nfs_zap_acl_cache(inode);
5280         ret = nfs4_read_cached_acl(inode, buf, buflen);
5281         if (ret != -ENOENT)
5282                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5283                  * but no cached acl data, just the acl length */
5284                 return ret;
5285         return nfs4_get_acl_uncached(inode, buf, buflen);
5286 }
5287 
5288 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5289 {
5290         struct nfs_server *server = NFS_SERVER(inode);
5291         struct page *pages[NFS4ACL_MAXPAGES];
5292         struct nfs_setaclargs arg = {
5293                 .fh             = NFS_FH(inode),
5294                 .acl_pages      = pages,
5295                 .acl_len        = buflen,
5296         };
5297         struct nfs_setaclres res;
5298         struct rpc_message msg = {
5299                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5300                 .rpc_argp       = &arg,
5301                 .rpc_resp       = &res,
5302         };
5303         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5304         int ret, i;
5305 
5306         if (!nfs4_server_supports_acls(server))
5307                 return -EOPNOTSUPP;
5308         if (npages > ARRAY_SIZE(pages))
5309                 return -ERANGE;
5310         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5311         if (i < 0)
5312                 return i;
5313         nfs4_inode_return_delegation(inode);
5314         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5315 
5316         /*
5317          * Free each page after tx, so the only ref left is
5318          * held by the network stack
5319          */
5320         for (; i > 0; i--)
5321                 put_page(pages[i-1]);
5322 
5323         /*
5324          * Acl update can result in inode attribute update.
5325          * so mark the attribute cache invalid.
5326          */
5327         spin_lock(&inode->i_lock);
5328         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
5329         spin_unlock(&inode->i_lock);
5330         nfs_access_zap_cache(inode);
5331         nfs_zap_acl_cache(inode);
5332         return ret;
5333 }
5334 
5335 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5336 {
5337         struct nfs4_exception exception = { };
5338         int err;
5339         do {
5340                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5341                 trace_nfs4_set_acl(inode, err);
5342                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5343                                 &exception);
5344         } while (exception.retry);
5345         return err;
5346 }
5347 
5348 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5349 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5350                                         size_t buflen)
5351 {
5352         struct nfs_server *server = NFS_SERVER(inode);
5353         struct nfs_fattr fattr;
5354         struct nfs4_label label = {0, 0, buflen, buf};
5355 
5356         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5357         struct nfs4_getattr_arg arg = {
5358                 .fh             = NFS_FH(inode),
5359                 .bitmask        = bitmask,
5360         };
5361         struct nfs4_getattr_res res = {
5362                 .fattr          = &fattr,
5363                 .label          = &label,
5364                 .server         = server,
5365         };
5366         struct rpc_message msg = {
5367                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5368                 .rpc_argp       = &arg,
5369                 .rpc_resp       = &res,
5370         };
5371         int ret;
5372 
5373         nfs_fattr_init(&fattr);
5374 
5375         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5376         if (ret)
5377                 return ret;
5378         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5379                 return -ENOENT;
5380         if (buflen < label.len)
5381                 return -ERANGE;
5382         return 0;
5383 }
5384 
5385 static int nfs4_get_security_label(struct inode *inode, void *buf,
5386                                         size_t buflen)
5387 {
5388         struct nfs4_exception exception = { };
5389         int err;
5390 
5391         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5392                 return -EOPNOTSUPP;
5393 
5394         do {
5395                 err = _nfs4_get_security_label(inode, buf, buflen);
5396                 trace_nfs4_get_security_label(inode, err);
5397                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5398                                 &exception);
5399         } while (exception.retry);
5400         return err;
5401 }
5402 
5403 static int _nfs4_do_set_security_label(struct inode *inode,
5404                 struct nfs4_label *ilabel,
5405                 struct nfs_fattr *fattr,
5406                 struct nfs4_label *olabel)
5407 {
5408 
5409         struct iattr sattr = {0};
5410         struct nfs_server *server = NFS_SERVER(inode);
5411         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5412         struct nfs_setattrargs arg = {
5413                 .fh             = NFS_FH(inode),
5414                 .iap            = &sattr,
5415                 .server         = server,
5416                 .bitmask        = bitmask,
5417                 .label          = ilabel,
5418         };
5419         struct nfs_setattrres res = {
5420                 .fattr          = fattr,
5421                 .label          = olabel,
5422                 .server         = server,
5423         };
5424         struct rpc_message msg = {
5425                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5426                 .rpc_argp       = &arg,
5427                 .rpc_resp       = &res,
5428         };
5429         int status;
5430 
5431         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5432 
5433         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5434         if (status)
5435                 dprintk("%s failed: %d\n", __func__, status);
5436 
5437         return status;
5438 }
5439 
5440 static int nfs4_do_set_security_label(struct inode *inode,
5441                 struct nfs4_label *ilabel,
5442                 struct nfs_fattr *fattr,
5443                 struct nfs4_label *olabel)
5444 {
5445         struct nfs4_exception exception = { };
5446         int err;
5447 
5448         do {
5449                 err = _nfs4_do_set_security_label(inode, ilabel,
5450                                 fattr, olabel);
5451                 trace_nfs4_set_security_label(inode, err);
5452                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5453                                 &exception);
5454         } while (exception.retry);
5455         return err;
5456 }
5457 
5458 static int
5459 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5460 {
5461         struct nfs4_label ilabel, *olabel = NULL;
5462         struct nfs_fattr fattr;
5463         struct rpc_cred *cred;
5464         int status;
5465 
5466         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5467                 return -EOPNOTSUPP;
5468 
5469         nfs_fattr_init(&fattr);
5470 
5471         ilabel.pi = 0;
5472         ilabel.lfs = 0;
5473         ilabel.label = (char *)buf;
5474         ilabel.len = buflen;
5475 
5476         cred = rpc_lookup_cred();
5477         if (IS_ERR(cred))
5478                 return PTR_ERR(cred);
5479 
5480         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5481         if (IS_ERR(olabel)) {
5482                 status = -PTR_ERR(olabel);
5483                 goto out;
5484         }
5485 
5486         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5487         if (status == 0)
5488                 nfs_setsecurity(inode, &fattr, olabel);
5489 
5490         nfs4_label_free(olabel);
5491 out:
5492         put_rpccred(cred);
5493         return status;
5494 }
5495 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5496 
5497 
5498 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5499                                     nfs4_verifier *bootverf)
5500 {
5501         __be32 verf[2];
5502 
5503         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5504                 /* An impossible timestamp guarantees this value
5505                  * will never match a generated boot time. */
5506                 verf[0] = cpu_to_be32(U32_MAX);
5507                 verf[1] = cpu_to_be32(U32_MAX);
5508         } else {
5509                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5510                 u64 ns = ktime_to_ns(nn->boot_time);
5511 
5512                 verf[0] = cpu_to_be32(ns >> 32);
5513                 verf[1] = cpu_to_be32(ns);
5514         }
5515         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5516 }
5517 
5518 static int
5519 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5520 {
5521         size_t len;
5522         char *str;
5523 
5524         if (clp->cl_owner_id != NULL)
5525                 return 0;
5526 
5527         rcu_read_lock();
5528         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5529                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5530                 1 +
5531                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5532                 1;
5533         rcu_read_unlock();
5534 
5535         if (len > NFS4_OPAQUE_LIMIT + 1)
5536                 return -EINVAL;
5537 
5538         /*
5539          * Since this string is allocated at mount time, and held until the
5540          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5541          * about a memory-reclaim deadlock.
5542          */
5543         str = kmalloc(len, GFP_KERNEL);
5544         if (!str)
5545                 return -ENOMEM;
5546 
5547         rcu_read_lock();
5548         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5549                         clp->cl_ipaddr,
5550                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5551                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5552         rcu_read_unlock();
5553 
5554         clp->cl_owner_id = str;
5555         return 0;
5556 }
5557 
5558 static int
5559 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5560 {
5561         size_t len;
5562         char *str;
5563 
5564         len = 10 + 10 + 1 + 10 + 1 +
5565                 strlen(nfs4_client_id_uniquifier) + 1 +
5566                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5567 
5568         if (len > NFS4_OPAQUE_LIMIT + 1)
5569                 return -EINVAL;
5570 
5571         /*
5572          * Since this string is allocated at mount time, and held until the
5573          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5574          * about a memory-reclaim deadlock.
5575          */
5576         str = kmalloc(len, GFP_KERNEL);
5577         if (!str)
5578                 return -ENOMEM;
5579 
5580         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5581                         clp->rpc_ops->version, clp->cl_minorversion,
5582                         nfs4_client_id_uniquifier,
5583                         clp->cl_rpcclient->cl_nodename);
5584         clp->cl_owner_id = str;
5585         return 0;
5586 }
5587 
5588 static int
5589 nfs4_init_uniform_client_string(struct nfs_client *clp)
5590 {
5591         size_t len;
5592         char *str;
5593 
5594         if (clp->cl_owner_id != NULL)
5595                 return 0;
5596 
5597         if (nfs4_client_id_uniquifier[0] != '\0')
5598                 return nfs4_init_uniquifier_client_string(clp);
5599 
5600         len = 10 + 10 + 1 + 10 + 1 +
5601                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5602 
5603         if (len > NFS4_OPAQUE_LIMIT + 1)
5604                 return -EINVAL;
5605 
5606         /*
5607          * Since this string is allocated at mount time, and held until the
5608          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5609          * about a memory-reclaim deadlock.
5610          */
5611         str = kmalloc(len, GFP_KERNEL);
5612         if (!str)
5613                 return -ENOMEM;
5614 
5615         scnprintf(str, len, "Linux NFSv%u.%u %s",
5616                         clp->rpc_ops->version, clp->cl_minorversion,
5617                         clp->cl_rpcclient->cl_nodename);
5618         clp->cl_owner_id = str;
5619         return 0;
5620 }
5621 
5622 /*
5623  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5624  * services.  Advertise one based on the address family of the
5625  * clientaddr.
5626  */
5627 static unsigned int
5628 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5629 {
5630         if (strchr(clp->cl_ipaddr, ':') != NULL)
5631                 return scnprintf(buf, len, "tcp6");
5632         else
5633                 return scnprintf(buf, len, "tcp");
5634 }
5635 
5636 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5637 {
5638         struct nfs4_setclientid *sc = calldata;
5639 
5640         if (task->tk_status == 0)
5641                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5642 }
5643 
5644 static const struct rpc_call_ops nfs4_setclientid_ops = {
5645         .rpc_call_done = nfs4_setclientid_done,
5646 };
5647 
5648 /**
5649  * nfs4_proc_setclientid - Negotiate client ID
5650  * @clp: state data structure
5651  * @program: RPC program for NFSv4 callback service
5652  * @port: IP port number for NFS4 callback service
5653  * @cred: RPC credential to use for this call
5654  * @res: where to place the result
5655  *
5656  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5657  */
5658 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5659                 unsigned short port, struct rpc_cred *cred,
5660                 struct nfs4_setclientid_res *res)
5661 {
5662         nfs4_verifier sc_verifier;
5663         struct nfs4_setclientid setclientid = {
5664                 .sc_verifier = &sc_verifier,
5665                 .sc_prog = program,
5666                 .sc_clnt = clp,
5667         };
5668         struct rpc_message msg = {
5669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5670                 .rpc_argp = &setclientid,
5671                 .rpc_resp = res,
5672                 .rpc_cred = cred,
5673         };
5674         struct rpc_task *task;
5675         struct rpc_task_setup task_setup_data = {
5676                 .rpc_client = clp->cl_rpcclient,
5677                 .rpc_message = &msg,
5678                 .callback_ops = &nfs4_setclientid_ops,
5679                 .callback_data = &setclientid,
5680                 .flags = RPC_TASK_TIMEOUT,
5681         };
5682         int status;
5683 
5684         /* nfs_client_id4 */
5685         nfs4_init_boot_verifier(clp, &sc_verifier);
5686 
5687         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5688                 status = nfs4_init_uniform_client_string(clp);
5689         else
5690                 status = nfs4_init_nonuniform_client_string(clp);
5691 
5692         if (status)
5693                 goto out;
5694 
5695         /* cb_client4 */
5696         setclientid.sc_netid_len =
5697                                 nfs4_init_callback_netid(clp,
5698                                                 setclientid.sc_netid,
5699                                                 sizeof(setclientid.sc_netid));
5700         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5701                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5702                                 clp->cl_ipaddr, port >> 8, port & 255);
5703 
5704         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5705                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5706                 clp->cl_owner_id);
5707         task = rpc_run_task(&task_setup_data);
5708         if (IS_ERR(task)) {
5709                 status = PTR_ERR(task);
5710                 goto out;
5711         }
5712         status = task->tk_status;
5713         if (setclientid.sc_cred) {
5714                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5715                 put_rpccred(setclientid.sc_cred);
5716         }
5717         rpc_put_task(task);
5718 out:
5719         trace_nfs4_setclientid(clp, status);
5720         dprintk("NFS reply setclientid: %d\n", status);
5721         return status;
5722 }
5723 
5724 /**
5725  * nfs4_proc_setclientid_confirm - Confirm client ID
5726  * @clp: state data structure
5727  * @res: result of a previous SETCLIENTID
5728  * @cred: RPC credential to use for this call
5729  *
5730  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5731  */
5732 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5733                 struct nfs4_setclientid_res *arg,
5734                 struct rpc_cred *cred)
5735 {
5736         struct rpc_message msg = {
5737                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5738                 .rpc_argp = arg,
5739                 .rpc_cred = cred,
5740         };
5741         int status;
5742 
5743         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5744                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5745                 clp->cl_clientid);
5746         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5747         trace_nfs4_setclientid_confirm(clp, status);
5748         dprintk("NFS reply setclientid_confirm: %d\n", status);
5749         return status;
5750 }
5751 
5752 struct nfs4_delegreturndata {
5753         struct nfs4_delegreturnargs args;
5754         struct nfs4_delegreturnres res;
5755         struct nfs_fh fh;
5756         nfs4_stateid stateid;
5757         unsigned long timestamp;
5758         struct {
5759                 struct nfs4_layoutreturn_args arg;
5760                 struct nfs4_layoutreturn_res res;
5761                 struct nfs4_xdr_opaque_data ld_private;
5762                 u32 roc_barrier;
5763                 bool roc;
5764         } lr;
5765         struct nfs_fattr fattr;
5766         int rpc_status;
5767         struct inode *inode;
5768 };
5769 
5770 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5771 {
5772         struct nfs4_delegreturndata *data = calldata;
5773         struct nfs4_exception exception = {
5774                 .inode = data->inode,
5775                 .stateid = &data->stateid,
5776         };
5777 
5778         if (!nfs4_sequence_done(task, &data->res.seq_res))
5779                 return;
5780 
5781         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5782 
5783         /* Handle Layoutreturn errors */
5784         if (data->args.lr_args && task->tk_status != 0) {
5785                 switch(data->res.lr_ret) {
5786                 default:
5787                         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
5788                         break;
5789                 case 0:
5790                         data->args.lr_args = NULL;
5791                         data->res.lr_res = NULL;
5792                         break;
5793                 case -NFS4ERR_OLD_STATEID:
5794                         if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid,
5795                                                 data->inode))
5796                                 goto lr_restart;
5797                         /* Fallthrough */
5798                 case -NFS4ERR_ADMIN_REVOKED:
5799                 case -NFS4ERR_DELEG_REVOKED:
5800                 case -NFS4ERR_EXPIRED:
5801                 case -NFS4ERR_BAD_STATEID:
5802                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
5803                 case -NFS4ERR_WRONG_CRED:
5804                         data->args.lr_args = NULL;
5805                         data->res.lr_res = NULL;
5806                         goto lr_restart;
5807                 }
5808         }
5809 
5810         switch (task->tk_status) {
5811         case 0:
5812                 renew_lease(data->res.server, data->timestamp);
5813                 break;
5814         case -NFS4ERR_ADMIN_REVOKED:
5815         case -NFS4ERR_DELEG_REVOKED:
5816         case -NFS4ERR_EXPIRED:
5817                 nfs4_free_revoked_stateid(data->res.server,
5818                                 data->args.stateid,
5819                                 task->tk_msg.rpc_cred);
5820                 /* Fallthrough */
5821         case -NFS4ERR_BAD_STATEID:
5822         case -NFS4ERR_STALE_STATEID:
5823                 task->tk_status = 0;
5824                 break;
5825         case -NFS4ERR_OLD_STATEID:
5826                 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
5827                         goto out_restart;
5828                 task->tk_status = 0;
5829                 break;
5830         case -NFS4ERR_ACCESS:
5831                 if (data->args.bitmask) {
5832                         data->args.bitmask = NULL;
5833                         data->res.fattr = NULL;
5834                         goto out_restart;
5835                 }
5836                 /* Fallthrough */
5837         default:
5838                 task->tk_status = nfs4_async_handle_exception(task,
5839                                 data->res.server, task->tk_status,
5840                                 &exception);
5841                 if (exception.retry)
5842                         goto out_restart;
5843         }
5844         data->rpc_status = task->tk_status;
5845         return;
5846 lr_restart:
5847         data->res.lr_ret = 0;
5848 out_restart:
5849         task->tk_status = 0;
5850         rpc_restart_call_prepare(task);
5851 }
5852 
5853 static void nfs4_delegreturn_release(void *calldata)
5854 {
5855         struct nfs4_delegreturndata *data = calldata;
5856         struct inode *inode = data->inode;
5857 
5858         if (inode) {
5859                 if (data->lr.roc)
5860                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
5861                                         data->res.lr_ret);
5862                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5863                 nfs_iput_and_deactive(inode);
5864         }
5865         kfree(calldata);
5866 }
5867 
5868 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5869 {
5870         struct nfs4_delegreturndata *d_data;
5871 
5872         d_data = (struct nfs4_delegreturndata *)data;
5873 
5874         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
5875                 return;
5876 
5877         nfs4_setup_sequence(d_data->res.server->nfs_client,
5878                         &d_data->args.seq_args,
5879                         &d_data->res.seq_res,
5880                         task);
5881 }
5882 
5883 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5884         .rpc_call_prepare = nfs4_delegreturn_prepare,
5885         .rpc_call_done = nfs4_delegreturn_done,
5886         .rpc_release = nfs4_delegreturn_release,
5887 };
5888 
5889 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5890 {
5891         struct nfs4_delegreturndata *data;
5892         struct nfs_server *server = NFS_SERVER(inode);
5893         struct rpc_task *task;
5894         struct rpc_message msg = {
5895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5896                 .rpc_cred = cred,
5897         };
5898         struct rpc_task_setup task_setup_data = {
5899                 .rpc_client = server->client,
5900                 .rpc_message = &msg,
5901                 .callback_ops = &nfs4_delegreturn_ops,
5902                 .flags = RPC_TASK_ASYNC,
5903         };
5904         int status = 0;
5905 
5906         data = kzalloc(sizeof(*data), GFP_NOFS);
5907         if (data == NULL)
5908                 return -ENOMEM;
5909         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5910 
5911         nfs4_state_protect(server->nfs_client,
5912                         NFS_SP4_MACH_CRED_CLEANUP,
5913                         &task_setup_data.rpc_client, &msg);
5914 
5915         data->args.fhandle = &data->fh;
5916         data->args.stateid = &data->stateid;
5917         data->args.bitmask = server->cache_consistency_bitmask;
5918         nfs_copy_fh(&data->fh, NFS_FH(inode));
5919         nfs4_stateid_copy(&data->stateid, stateid);
5920         data->res.fattr = &data->fattr;
5921         data->res.server = server;
5922         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
5923         data->lr.arg.ld_private = &data->lr.ld_private;
5924         nfs_fattr_init(data->res.fattr);
5925         data->timestamp = jiffies;
5926         data->rpc_status = 0;
5927         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
5928         data->inode = nfs_igrab_and_active(inode);
5929         if (data->inode) {
5930                 if (data->lr.roc) {
5931                         data->args.lr_args = &data->lr.arg;
5932                         data->res.lr_res = &data->lr.res;
5933                 }
5934         } else if (data->lr.roc) {
5935                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
5936                 data->lr.roc = false;
5937         }
5938 
5939         task_setup_data.callback_data = data;
5940         msg.rpc_argp = &data->args;
5941         msg.rpc_resp = &data->res;
5942         task = rpc_run_task(&task_setup_data);
5943         if (IS_ERR(task))
5944                 return PTR_ERR(task);
5945         if (!issync)
5946                 goto out;
5947         status = rpc_wait_for_completion_task(task);
5948         if (status != 0)
5949                 goto out;
5950         status = data->rpc_status;
5951 out:
5952         rpc_put_task(task);
5953         return status;
5954 }
5955 
5956 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5957 {
5958         struct nfs_server *server = NFS_SERVER(inode);
5959         struct nfs4_exception exception = { };
5960         int err;
5961         do {
5962                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5963                 trace_nfs4_delegreturn(inode, stateid, err);
5964                 switch (err) {
5965                         case -NFS4ERR_STALE_STATEID:
5966                         case -NFS4ERR_EXPIRED:
5967                         case 0:
5968                                 return 0;
5969                 }
5970                 err = nfs4_handle_exception(server, err, &exception);
5971         } while (exception.retry);
5972         return err;
5973 }
5974 
5975 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5976 {
5977         struct inode *inode = state->inode;
5978         struct nfs_server *server = NFS_SERVER(inode);
5979         struct nfs_client *clp = server->nfs_client;
5980         struct nfs_lockt_args arg = {
5981                 .fh = NFS_FH(inode),
5982                 .fl = request,
5983         };
5984         struct nfs_lockt_res res = {
5985                 .denied = request,
5986         };
5987         struct rpc_message msg = {
5988                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5989                 .rpc_argp       = &arg,
5990                 .rpc_resp       = &res,
5991                 .rpc_cred       = state->owner->so_cred,
5992         };
5993         struct nfs4_lock_state *lsp;
5994         int status;
5995 
5996         arg.lock_owner.clientid = clp->cl_clientid;
5997         status = nfs4_set_lock_state(state, request);
5998         if (status != 0)
5999                 goto out;
6000         lsp = request->fl_u.nfs4_fl.owner;
6001         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6002         arg.lock_owner.s_dev = server->s_dev;
6003         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6004         switch (status) {
6005                 case 0:
6006                         request->fl_type = F_UNLCK;
6007                         break;
6008                 case -NFS4ERR_DENIED:
6009                         status = 0;
6010         }
6011         request->fl_ops->fl_release_private(request);
6012         request->fl_ops = NULL;
6013 out:
6014         return status;
6015 }
6016 
6017 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6018 {
6019         struct nfs4_exception exception = { };
6020         int err;
6021 
6022         do {
6023                 err = _nfs4_proc_getlk(state, cmd, request);
6024                 trace_nfs4_get_lock(request, state, cmd, err);
6025                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6026                                 &exception);
6027         } while (exception.retry);
6028         return err;
6029 }
6030 
6031 struct nfs4_unlockdata {
6032         struct nfs_locku_args arg;
6033         struct nfs_locku_res res;
6034         struct nfs4_lock_state *lsp;
6035         struct nfs_open_context *ctx;
6036         struct nfs_lock_context *l_ctx;
6037         struct file_lock fl;
6038         struct nfs_server *server;
6039         unsigned long timestamp;
6040 };
6041 
6042 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6043                 struct nfs_open_context *ctx,
6044                 struct nfs4_lock_state *lsp,
6045                 struct nfs_seqid *seqid)
6046 {
6047         struct nfs4_unlockdata *p;
6048         struct inode *inode = lsp->ls_state->inode;
6049 
6050         p = kzalloc(sizeof(*p), GFP_NOFS);
6051         if (p == NULL)
6052                 return NULL;
6053         p->arg.fh = NFS_FH(inode);
6054         p->arg.fl = &p->fl;
6055         p->arg.seqid = seqid;
6056         p->res.seqid = seqid;
6057         p->lsp = lsp;
6058         refcount_inc(&lsp->ls_count);
6059         /* Ensure we don't close file until we're done freeing locks! */
6060         p->ctx = get_nfs_open_context(ctx);
6061         p->l_ctx = nfs_get_lock_context(ctx);
6062         memcpy(&p->fl, fl, sizeof(p->fl));
6063         p->server = NFS_SERVER(inode);
6064         return p;
6065 }
6066 
6067 static void nfs4_locku_release_calldata(void *data)
6068 {
6069         struct nfs4_unlockdata *calldata = data;
6070         nfs_free_seqid(calldata->arg.seqid);
6071         nfs4_put_lock_state(calldata->lsp);
6072         nfs_put_lock_context(calldata->l_ctx);
6073         put_nfs_open_context(calldata->ctx);
6074         kfree(calldata);
6075 }
6076 
6077 static void nfs4_locku_done(struct rpc_task *task, void *data)
6078 {
6079         struct nfs4_unlockdata *calldata = data;
6080         struct nfs4_exception exception = {
6081                 .inode = calldata->lsp->ls_state->inode,
6082                 .stateid = &calldata->arg.stateid,
6083         };
6084 
6085         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6086                 return;
6087         switch (task->tk_status) {
6088                 case 0:
6089                         renew_lease(calldata->server, calldata->timestamp);
6090                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6091