xref: /openbmc/linux/fs/nfs/nfs4proc.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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/sunrpc/clnt.h>
43 #include <linux/nfs.h>
44 #include <linux/nfs4.h>
45 #include <linux/nfs_fs.h>
46 #include <linux/nfs_page.h>
47 #include <linux/namei.h>
48 #include <linux/mount.h>
49 #include <linux/module.h>
50 #include <linux/sunrpc/bc_xprt.h>
51 
52 #include "nfs4_fs.h"
53 #include "delegation.h"
54 #include "internal.h"
55 #include "iostat.h"
56 #include "callback.h"
57 
58 #define NFSDBG_FACILITY		NFSDBG_PROC
59 
60 #define NFS4_POLL_RETRY_MIN	(HZ/10)
61 #define NFS4_POLL_RETRY_MAX	(15*HZ)
62 
63 #define NFS4_MAX_LOOP_ON_RECOVER (10)
64 
65 struct nfs4_opendata;
66 static int _nfs4_proc_open(struct nfs4_opendata *data);
67 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
68 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
69 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
70 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
71 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
72 
73 /* Prevent leaks of NFSv4 errors into userland */
74 static int nfs4_map_errors(int err)
75 {
76 	if (err >= -1000)
77 		return err;
78 	switch (err) {
79 	case -NFS4ERR_RESOURCE:
80 		return -EREMOTEIO;
81 	default:
82 		dprintk("%s could not handle NFSv4 error %d\n",
83 				__func__, -err);
84 		break;
85 	}
86 	return -EIO;
87 }
88 
89 /*
90  * This is our standard bitmap for GETATTR requests.
91  */
92 const u32 nfs4_fattr_bitmap[2] = {
93 	FATTR4_WORD0_TYPE
94 	| FATTR4_WORD0_CHANGE
95 	| FATTR4_WORD0_SIZE
96 	| FATTR4_WORD0_FSID
97 	| FATTR4_WORD0_FILEID,
98 	FATTR4_WORD1_MODE
99 	| FATTR4_WORD1_NUMLINKS
100 	| FATTR4_WORD1_OWNER
101 	| FATTR4_WORD1_OWNER_GROUP
102 	| FATTR4_WORD1_RAWDEV
103 	| FATTR4_WORD1_SPACE_USED
104 	| FATTR4_WORD1_TIME_ACCESS
105 	| FATTR4_WORD1_TIME_METADATA
106 	| FATTR4_WORD1_TIME_MODIFY
107 };
108 
109 const u32 nfs4_statfs_bitmap[2] = {
110 	FATTR4_WORD0_FILES_AVAIL
111 	| FATTR4_WORD0_FILES_FREE
112 	| FATTR4_WORD0_FILES_TOTAL,
113 	FATTR4_WORD1_SPACE_AVAIL
114 	| FATTR4_WORD1_SPACE_FREE
115 	| FATTR4_WORD1_SPACE_TOTAL
116 };
117 
118 const u32 nfs4_pathconf_bitmap[2] = {
119 	FATTR4_WORD0_MAXLINK
120 	| FATTR4_WORD0_MAXNAME,
121 	0
122 };
123 
124 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
125 			| FATTR4_WORD0_MAXREAD
126 			| FATTR4_WORD0_MAXWRITE
127 			| FATTR4_WORD0_LEASE_TIME,
128 			0
129 };
130 
131 const u32 nfs4_fs_locations_bitmap[2] = {
132 	FATTR4_WORD0_TYPE
133 	| FATTR4_WORD0_CHANGE
134 	| FATTR4_WORD0_SIZE
135 	| FATTR4_WORD0_FSID
136 	| FATTR4_WORD0_FILEID
137 	| FATTR4_WORD0_FS_LOCATIONS,
138 	FATTR4_WORD1_MODE
139 	| FATTR4_WORD1_NUMLINKS
140 	| FATTR4_WORD1_OWNER
141 	| FATTR4_WORD1_OWNER_GROUP
142 	| FATTR4_WORD1_RAWDEV
143 	| FATTR4_WORD1_SPACE_USED
144 	| FATTR4_WORD1_TIME_ACCESS
145 	| FATTR4_WORD1_TIME_METADATA
146 	| FATTR4_WORD1_TIME_MODIFY
147 	| FATTR4_WORD1_MOUNTED_ON_FILEID
148 };
149 
150 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
151 		struct nfs4_readdir_arg *readdir)
152 {
153 	__be32 *start, *p;
154 
155 	BUG_ON(readdir->count < 80);
156 	if (cookie > 2) {
157 		readdir->cookie = cookie;
158 		memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
159 		return;
160 	}
161 
162 	readdir->cookie = 0;
163 	memset(&readdir->verifier, 0, sizeof(readdir->verifier));
164 	if (cookie == 2)
165 		return;
166 
167 	/*
168 	 * NFSv4 servers do not return entries for '.' and '..'
169 	 * Therefore, we fake these entries here.  We let '.'
170 	 * have cookie 0 and '..' have cookie 1.  Note that
171 	 * when talking to the server, we always send cookie 0
172 	 * instead of 1 or 2.
173 	 */
174 	start = p = kmap_atomic(*readdir->pages, KM_USER0);
175 
176 	if (cookie == 0) {
177 		*p++ = xdr_one;                                  /* next */
178 		*p++ = xdr_zero;                   /* cookie, first word */
179 		*p++ = xdr_one;                   /* cookie, second word */
180 		*p++ = xdr_one;                             /* entry len */
181 		memcpy(p, ".\0\0\0", 4);                        /* entry */
182 		p++;
183 		*p++ = xdr_one;                         /* bitmap length */
184 		*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
185 		*p++ = htonl(8);              /* attribute buffer length */
186 		p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
187 	}
188 
189 	*p++ = xdr_one;                                  /* next */
190 	*p++ = xdr_zero;                   /* cookie, first word */
191 	*p++ = xdr_two;                   /* cookie, second word */
192 	*p++ = xdr_two;                             /* entry len */
193 	memcpy(p, "..\0\0", 4);                         /* entry */
194 	p++;
195 	*p++ = xdr_one;                         /* bitmap length */
196 	*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
197 	*p++ = htonl(8);              /* attribute buffer length */
198 	p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
199 
200 	readdir->pgbase = (char *)p - (char *)start;
201 	readdir->count -= readdir->pgbase;
202 	kunmap_atomic(start, KM_USER0);
203 }
204 
205 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
206 {
207 	int res;
208 
209 	might_sleep();
210 
211 	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
212 			nfs_wait_bit_killable, TASK_KILLABLE);
213 	return res;
214 }
215 
216 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
217 {
218 	int res = 0;
219 
220 	might_sleep();
221 
222 	if (*timeout <= 0)
223 		*timeout = NFS4_POLL_RETRY_MIN;
224 	if (*timeout > NFS4_POLL_RETRY_MAX)
225 		*timeout = NFS4_POLL_RETRY_MAX;
226 	schedule_timeout_killable(*timeout);
227 	if (fatal_signal_pending(current))
228 		res = -ERESTARTSYS;
229 	*timeout <<= 1;
230 	return res;
231 }
232 
233 /* This is the error handling routine for processes that are allowed
234  * to sleep.
235  */
236 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
237 {
238 	struct nfs_client *clp = server->nfs_client;
239 	struct nfs4_state *state = exception->state;
240 	int ret = errorcode;
241 
242 	exception->retry = 0;
243 	switch(errorcode) {
244 		case 0:
245 			return 0;
246 		case -NFS4ERR_ADMIN_REVOKED:
247 		case -NFS4ERR_BAD_STATEID:
248 		case -NFS4ERR_OPENMODE:
249 			if (state == NULL)
250 				break;
251 			nfs4_state_mark_reclaim_nograce(clp, state);
252 		case -NFS4ERR_STALE_CLIENTID:
253 		case -NFS4ERR_STALE_STATEID:
254 		case -NFS4ERR_EXPIRED:
255 			nfs4_schedule_state_recovery(clp);
256 			ret = nfs4_wait_clnt_recover(clp);
257 			if (ret == 0)
258 				exception->retry = 1;
259 #if !defined(CONFIG_NFS_V4_1)
260 			break;
261 #else /* !defined(CONFIG_NFS_V4_1) */
262 			if (!nfs4_has_session(server->nfs_client))
263 				break;
264 			/* FALLTHROUGH */
265 		case -NFS4ERR_BADSESSION:
266 		case -NFS4ERR_BADSLOT:
267 		case -NFS4ERR_BAD_HIGH_SLOT:
268 		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
269 		case -NFS4ERR_DEADSESSION:
270 		case -NFS4ERR_SEQ_FALSE_RETRY:
271 		case -NFS4ERR_SEQ_MISORDERED:
272 			dprintk("%s ERROR: %d Reset session\n", __func__,
273 				errorcode);
274 			nfs4_schedule_state_recovery(clp);
275 			exception->retry = 1;
276 			break;
277 #endif /* !defined(CONFIG_NFS_V4_1) */
278 		case -NFS4ERR_FILE_OPEN:
279 			if (exception->timeout > HZ) {
280 				/* We have retried a decent amount, time to
281 				 * fail
282 				 */
283 				ret = -EBUSY;
284 				break;
285 			}
286 		case -NFS4ERR_GRACE:
287 		case -NFS4ERR_DELAY:
288 			ret = nfs4_delay(server->client, &exception->timeout);
289 			if (ret != 0)
290 				break;
291 		case -NFS4ERR_OLD_STATEID:
292 			exception->retry = 1;
293 	}
294 	/* We failed to handle the error */
295 	return nfs4_map_errors(ret);
296 }
297 
298 
299 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
300 {
301 	struct nfs_client *clp = server->nfs_client;
302 	spin_lock(&clp->cl_lock);
303 	if (time_before(clp->cl_last_renewal,timestamp))
304 		clp->cl_last_renewal = timestamp;
305 	spin_unlock(&clp->cl_lock);
306 }
307 
308 #if defined(CONFIG_NFS_V4_1)
309 
310 /*
311  * nfs4_free_slot - free a slot and efficiently update slot table.
312  *
313  * freeing a slot is trivially done by clearing its respective bit
314  * in the bitmap.
315  * If the freed slotid equals highest_used_slotid we want to update it
316  * so that the server would be able to size down the slot table if needed,
317  * otherwise we know that the highest_used_slotid is still in use.
318  * When updating highest_used_slotid there may be "holes" in the bitmap
319  * so we need to scan down from highest_used_slotid to 0 looking for the now
320  * highest slotid in use.
321  * If none found, highest_used_slotid is set to -1.
322  *
323  * Must be called while holding tbl->slot_tbl_lock
324  */
325 static void
326 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
327 {
328 	int slotid = free_slotid;
329 
330 	/* clear used bit in bitmap */
331 	__clear_bit(slotid, tbl->used_slots);
332 
333 	/* update highest_used_slotid when it is freed */
334 	if (slotid == tbl->highest_used_slotid) {
335 		slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
336 		if (slotid < tbl->max_slots)
337 			tbl->highest_used_slotid = slotid;
338 		else
339 			tbl->highest_used_slotid = -1;
340 	}
341 	dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
342 		free_slotid, tbl->highest_used_slotid);
343 }
344 
345 /*
346  * Signal state manager thread if session is drained
347  */
348 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
349 {
350 	struct rpc_task *task;
351 
352 	if (!test_bit(NFS4CLNT_SESSION_DRAINING, &ses->clp->cl_state)) {
353 		task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
354 		if (task)
355 			rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
356 		return;
357 	}
358 
359 	if (ses->fc_slot_table.highest_used_slotid != -1)
360 		return;
361 
362 	dprintk("%s COMPLETE: Session Drained\n", __func__);
363 	complete(&ses->complete);
364 }
365 
366 static void nfs41_sequence_free_slot(const struct nfs_client *clp,
367 			      struct nfs4_sequence_res *res)
368 {
369 	struct nfs4_slot_table *tbl;
370 
371 	tbl = &clp->cl_session->fc_slot_table;
372 	if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
373 		/* just wake up the next guy waiting since
374 		 * we may have not consumed a slot after all */
375 		dprintk("%s: No slot\n", __func__);
376 		return;
377 	}
378 
379 	spin_lock(&tbl->slot_tbl_lock);
380 	nfs4_free_slot(tbl, res->sr_slotid);
381 	nfs41_check_drain_session_complete(clp->cl_session);
382 	spin_unlock(&tbl->slot_tbl_lock);
383 	res->sr_slotid = NFS4_MAX_SLOT_TABLE;
384 }
385 
386 static void nfs41_sequence_done(struct nfs_client *clp,
387 				struct nfs4_sequence_res *res,
388 				int rpc_status)
389 {
390 	unsigned long timestamp;
391 	struct nfs4_slot_table *tbl;
392 	struct nfs4_slot *slot;
393 
394 	/*
395 	 * sr_status remains 1 if an RPC level error occurred. The server
396 	 * may or may not have processed the sequence operation..
397 	 * Proceed as if the server received and processed the sequence
398 	 * operation.
399 	 */
400 	if (res->sr_status == 1)
401 		res->sr_status = NFS_OK;
402 
403 	/* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
404 	if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
405 		goto out;
406 
407 	/* Check the SEQUENCE operation status */
408 	if (res->sr_status == 0) {
409 		tbl = &clp->cl_session->fc_slot_table;
410 		slot = tbl->slots + res->sr_slotid;
411 		/* Update the slot's sequence and clientid lease timer */
412 		++slot->seq_nr;
413 		timestamp = res->sr_renewal_time;
414 		spin_lock(&clp->cl_lock);
415 		if (time_before(clp->cl_last_renewal, timestamp))
416 			clp->cl_last_renewal = timestamp;
417 		spin_unlock(&clp->cl_lock);
418 		/* Check sequence flags */
419 		nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
420 	}
421 out:
422 	/* The session may be reset by one of the error handlers. */
423 	dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
424 	nfs41_sequence_free_slot(clp, res);
425 }
426 
427 /*
428  * nfs4_find_slot - efficiently look for a free slot
429  *
430  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
431  * If found, we mark the slot as used, update the highest_used_slotid,
432  * and respectively set up the sequence operation args.
433  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
434  *
435  * Note: must be called with under the slot_tbl_lock.
436  */
437 static u8
438 nfs4_find_slot(struct nfs4_slot_table *tbl)
439 {
440 	int slotid;
441 	u8 ret_id = NFS4_MAX_SLOT_TABLE;
442 	BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
443 
444 	dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
445 		__func__, tbl->used_slots[0], tbl->highest_used_slotid,
446 		tbl->max_slots);
447 	slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
448 	if (slotid >= tbl->max_slots)
449 		goto out;
450 	__set_bit(slotid, tbl->used_slots);
451 	if (slotid > tbl->highest_used_slotid)
452 		tbl->highest_used_slotid = slotid;
453 	ret_id = slotid;
454 out:
455 	dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
456 		__func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
457 	return ret_id;
458 }
459 
460 static int nfs41_setup_sequence(struct nfs4_session *session,
461 				struct nfs4_sequence_args *args,
462 				struct nfs4_sequence_res *res,
463 				int cache_reply,
464 				struct rpc_task *task)
465 {
466 	struct nfs4_slot *slot;
467 	struct nfs4_slot_table *tbl;
468 	u8 slotid;
469 
470 	dprintk("--> %s\n", __func__);
471 	/* slot already allocated? */
472 	if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
473 		return 0;
474 
475 	memset(res, 0, sizeof(*res));
476 	res->sr_slotid = NFS4_MAX_SLOT_TABLE;
477 	tbl = &session->fc_slot_table;
478 
479 	spin_lock(&tbl->slot_tbl_lock);
480 	if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state) &&
481 	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
482 		/*
483 		 * The state manager will wait until the slot table is empty.
484 		 * Schedule the reset thread
485 		 */
486 		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
487 		spin_unlock(&tbl->slot_tbl_lock);
488 		dprintk("%s Schedule Session Reset\n", __func__);
489 		return -EAGAIN;
490 	}
491 
492 	if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
493 	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
494 		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
495 		spin_unlock(&tbl->slot_tbl_lock);
496 		dprintk("%s enforce FIFO order\n", __func__);
497 		return -EAGAIN;
498 	}
499 
500 	slotid = nfs4_find_slot(tbl);
501 	if (slotid == NFS4_MAX_SLOT_TABLE) {
502 		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
503 		spin_unlock(&tbl->slot_tbl_lock);
504 		dprintk("<-- %s: no free slots\n", __func__);
505 		return -EAGAIN;
506 	}
507 	spin_unlock(&tbl->slot_tbl_lock);
508 
509 	rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
510 	slot = tbl->slots + slotid;
511 	args->sa_session = session;
512 	args->sa_slotid = slotid;
513 	args->sa_cache_this = cache_reply;
514 
515 	dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
516 
517 	res->sr_session = session;
518 	res->sr_slotid = slotid;
519 	res->sr_renewal_time = jiffies;
520 	/*
521 	 * sr_status is only set in decode_sequence, and so will remain
522 	 * set to 1 if an rpc level failure occurs.
523 	 */
524 	res->sr_status = 1;
525 	return 0;
526 }
527 
528 int nfs4_setup_sequence(struct nfs_client *clp,
529 			struct nfs4_sequence_args *args,
530 			struct nfs4_sequence_res *res,
531 			int cache_reply,
532 			struct rpc_task *task)
533 {
534 	int ret = 0;
535 
536 	dprintk("--> %s clp %p session %p sr_slotid %d\n",
537 		__func__, clp, clp->cl_session, res->sr_slotid);
538 
539 	if (!nfs4_has_session(clp))
540 		goto out;
541 	ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
542 				   task);
543 	if (ret && ret != -EAGAIN) {
544 		/* terminate rpc task */
545 		task->tk_status = ret;
546 		task->tk_action = NULL;
547 	}
548 out:
549 	dprintk("<-- %s status=%d\n", __func__, ret);
550 	return ret;
551 }
552 
553 struct nfs41_call_sync_data {
554 	struct nfs_client *clp;
555 	struct nfs4_sequence_args *seq_args;
556 	struct nfs4_sequence_res *seq_res;
557 	int cache_reply;
558 };
559 
560 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
561 {
562 	struct nfs41_call_sync_data *data = calldata;
563 
564 	dprintk("--> %s data->clp->cl_session %p\n", __func__,
565 		data->clp->cl_session);
566 	if (nfs4_setup_sequence(data->clp, data->seq_args,
567 				data->seq_res, data->cache_reply, task))
568 		return;
569 	rpc_call_start(task);
570 }
571 
572 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
573 {
574 	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
575 	nfs41_call_sync_prepare(task, calldata);
576 }
577 
578 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
579 {
580 	struct nfs41_call_sync_data *data = calldata;
581 
582 	nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
583 }
584 
585 struct rpc_call_ops nfs41_call_sync_ops = {
586 	.rpc_call_prepare = nfs41_call_sync_prepare,
587 	.rpc_call_done = nfs41_call_sync_done,
588 };
589 
590 struct rpc_call_ops nfs41_call_priv_sync_ops = {
591 	.rpc_call_prepare = nfs41_call_priv_sync_prepare,
592 	.rpc_call_done = nfs41_call_sync_done,
593 };
594 
595 static int nfs4_call_sync_sequence(struct nfs_client *clp,
596 				   struct rpc_clnt *clnt,
597 				   struct rpc_message *msg,
598 				   struct nfs4_sequence_args *args,
599 				   struct nfs4_sequence_res *res,
600 				   int cache_reply,
601 				   int privileged)
602 {
603 	int ret;
604 	struct rpc_task *task;
605 	struct nfs41_call_sync_data data = {
606 		.clp = clp,
607 		.seq_args = args,
608 		.seq_res = res,
609 		.cache_reply = cache_reply,
610 	};
611 	struct rpc_task_setup task_setup = {
612 		.rpc_client = clnt,
613 		.rpc_message = msg,
614 		.callback_ops = &nfs41_call_sync_ops,
615 		.callback_data = &data
616 	};
617 
618 	res->sr_slotid = NFS4_MAX_SLOT_TABLE;
619 	if (privileged)
620 		task_setup.callback_ops = &nfs41_call_priv_sync_ops;
621 	task = rpc_run_task(&task_setup);
622 	if (IS_ERR(task))
623 		ret = PTR_ERR(task);
624 	else {
625 		ret = task->tk_status;
626 		rpc_put_task(task);
627 	}
628 	return ret;
629 }
630 
631 int _nfs4_call_sync_session(struct nfs_server *server,
632 			    struct rpc_message *msg,
633 			    struct nfs4_sequence_args *args,
634 			    struct nfs4_sequence_res *res,
635 			    int cache_reply)
636 {
637 	return nfs4_call_sync_sequence(server->nfs_client, server->client,
638 				       msg, args, res, cache_reply, 0);
639 }
640 
641 #endif /* CONFIG_NFS_V4_1 */
642 
643 int _nfs4_call_sync(struct nfs_server *server,
644 		    struct rpc_message *msg,
645 		    struct nfs4_sequence_args *args,
646 		    struct nfs4_sequence_res *res,
647 		    int cache_reply)
648 {
649 	args->sa_session = res->sr_session = NULL;
650 	return rpc_call_sync(server->client, msg, 0);
651 }
652 
653 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
654 	(server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
655 			&(res)->seq_res, (cache_reply))
656 
657 static void nfs4_sequence_done(const struct nfs_server *server,
658 			       struct nfs4_sequence_res *res, int rpc_status)
659 {
660 #ifdef CONFIG_NFS_V4_1
661 	if (nfs4_has_session(server->nfs_client))
662 		nfs41_sequence_done(server->nfs_client, res, rpc_status);
663 #endif /* CONFIG_NFS_V4_1 */
664 }
665 
666 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
667 {
668 	struct nfs_inode *nfsi = NFS_I(dir);
669 
670 	spin_lock(&dir->i_lock);
671 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
672 	if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
673 		nfs_force_lookup_revalidate(dir);
674 	nfsi->change_attr = cinfo->after;
675 	spin_unlock(&dir->i_lock);
676 }
677 
678 struct nfs4_opendata {
679 	struct kref kref;
680 	struct nfs_openargs o_arg;
681 	struct nfs_openres o_res;
682 	struct nfs_open_confirmargs c_arg;
683 	struct nfs_open_confirmres c_res;
684 	struct nfs_fattr f_attr;
685 	struct nfs_fattr dir_attr;
686 	struct path path;
687 	struct dentry *dir;
688 	struct nfs4_state_owner *owner;
689 	struct nfs4_state *state;
690 	struct iattr attrs;
691 	unsigned long timestamp;
692 	unsigned int rpc_done : 1;
693 	int rpc_status;
694 	int cancelled;
695 };
696 
697 
698 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
699 {
700 	p->o_res.f_attr = &p->f_attr;
701 	p->o_res.dir_attr = &p->dir_attr;
702 	p->o_res.seqid = p->o_arg.seqid;
703 	p->c_res.seqid = p->c_arg.seqid;
704 	p->o_res.server = p->o_arg.server;
705 	nfs_fattr_init(&p->f_attr);
706 	nfs_fattr_init(&p->dir_attr);
707 	p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
708 }
709 
710 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
711 		struct nfs4_state_owner *sp, fmode_t fmode, int flags,
712 		const struct iattr *attrs)
713 {
714 	struct dentry *parent = dget_parent(path->dentry);
715 	struct inode *dir = parent->d_inode;
716 	struct nfs_server *server = NFS_SERVER(dir);
717 	struct nfs4_opendata *p;
718 
719 	p = kzalloc(sizeof(*p), GFP_KERNEL);
720 	if (p == NULL)
721 		goto err;
722 	p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
723 	if (p->o_arg.seqid == NULL)
724 		goto err_free;
725 	p->path.mnt = mntget(path->mnt);
726 	p->path.dentry = dget(path->dentry);
727 	p->dir = parent;
728 	p->owner = sp;
729 	atomic_inc(&sp->so_count);
730 	p->o_arg.fh = NFS_FH(dir);
731 	p->o_arg.open_flags = flags;
732 	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
733 	p->o_arg.clientid = server->nfs_client->cl_clientid;
734 	p->o_arg.id = sp->so_owner_id.id;
735 	p->o_arg.name = &p->path.dentry->d_name;
736 	p->o_arg.server = server;
737 	p->o_arg.bitmask = server->attr_bitmask;
738 	p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
739 	if (flags & O_EXCL) {
740 		if (nfs4_has_persistent_session(server->nfs_client)) {
741 			/* GUARDED */
742 			p->o_arg.u.attrs = &p->attrs;
743 			memcpy(&p->attrs, attrs, sizeof(p->attrs));
744 		} else { /* EXCLUSIVE4_1 */
745 			u32 *s = (u32 *) p->o_arg.u.verifier.data;
746 			s[0] = jiffies;
747 			s[1] = current->pid;
748 		}
749 	} else if (flags & O_CREAT) {
750 		p->o_arg.u.attrs = &p->attrs;
751 		memcpy(&p->attrs, attrs, sizeof(p->attrs));
752 	}
753 	p->c_arg.fh = &p->o_res.fh;
754 	p->c_arg.stateid = &p->o_res.stateid;
755 	p->c_arg.seqid = p->o_arg.seqid;
756 	nfs4_init_opendata_res(p);
757 	kref_init(&p->kref);
758 	return p;
759 err_free:
760 	kfree(p);
761 err:
762 	dput(parent);
763 	return NULL;
764 }
765 
766 static void nfs4_opendata_free(struct kref *kref)
767 {
768 	struct nfs4_opendata *p = container_of(kref,
769 			struct nfs4_opendata, kref);
770 
771 	nfs_free_seqid(p->o_arg.seqid);
772 	if (p->state != NULL)
773 		nfs4_put_open_state(p->state);
774 	nfs4_put_state_owner(p->owner);
775 	dput(p->dir);
776 	path_put(&p->path);
777 	kfree(p);
778 }
779 
780 static void nfs4_opendata_put(struct nfs4_opendata *p)
781 {
782 	if (p != NULL)
783 		kref_put(&p->kref, nfs4_opendata_free);
784 }
785 
786 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
787 {
788 	int ret;
789 
790 	ret = rpc_wait_for_completion_task(task);
791 	return ret;
792 }
793 
794 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
795 {
796 	int ret = 0;
797 
798 	if (open_mode & O_EXCL)
799 		goto out;
800 	switch (mode & (FMODE_READ|FMODE_WRITE)) {
801 		case FMODE_READ:
802 			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
803 				&& state->n_rdonly != 0;
804 			break;
805 		case FMODE_WRITE:
806 			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
807 				&& state->n_wronly != 0;
808 			break;
809 		case FMODE_READ|FMODE_WRITE:
810 			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
811 				&& state->n_rdwr != 0;
812 	}
813 out:
814 	return ret;
815 }
816 
817 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
818 {
819 	if ((delegation->type & fmode) != fmode)
820 		return 0;
821 	if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
822 		return 0;
823 	nfs_mark_delegation_referenced(delegation);
824 	return 1;
825 }
826 
827 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
828 {
829 	switch (fmode) {
830 		case FMODE_WRITE:
831 			state->n_wronly++;
832 			break;
833 		case FMODE_READ:
834 			state->n_rdonly++;
835 			break;
836 		case FMODE_READ|FMODE_WRITE:
837 			state->n_rdwr++;
838 	}
839 	nfs4_state_set_mode_locked(state, state->state | fmode);
840 }
841 
842 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
843 {
844 	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
845 		memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
846 	memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
847 	switch (fmode) {
848 		case FMODE_READ:
849 			set_bit(NFS_O_RDONLY_STATE, &state->flags);
850 			break;
851 		case FMODE_WRITE:
852 			set_bit(NFS_O_WRONLY_STATE, &state->flags);
853 			break;
854 		case FMODE_READ|FMODE_WRITE:
855 			set_bit(NFS_O_RDWR_STATE, &state->flags);
856 	}
857 }
858 
859 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
860 {
861 	write_seqlock(&state->seqlock);
862 	nfs_set_open_stateid_locked(state, stateid, fmode);
863 	write_sequnlock(&state->seqlock);
864 }
865 
866 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
867 {
868 	/*
869 	 * Protect the call to nfs4_state_set_mode_locked and
870 	 * serialise the stateid update
871 	 */
872 	write_seqlock(&state->seqlock);
873 	if (deleg_stateid != NULL) {
874 		memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
875 		set_bit(NFS_DELEGATED_STATE, &state->flags);
876 	}
877 	if (open_stateid != NULL)
878 		nfs_set_open_stateid_locked(state, open_stateid, fmode);
879 	write_sequnlock(&state->seqlock);
880 	spin_lock(&state->owner->so_lock);
881 	update_open_stateflags(state, fmode);
882 	spin_unlock(&state->owner->so_lock);
883 }
884 
885 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
886 {
887 	struct nfs_inode *nfsi = NFS_I(state->inode);
888 	struct nfs_delegation *deleg_cur;
889 	int ret = 0;
890 
891 	fmode &= (FMODE_READ|FMODE_WRITE);
892 
893 	rcu_read_lock();
894 	deleg_cur = rcu_dereference(nfsi->delegation);
895 	if (deleg_cur == NULL)
896 		goto no_delegation;
897 
898 	spin_lock(&deleg_cur->lock);
899 	if (nfsi->delegation != deleg_cur ||
900 	    (deleg_cur->type & fmode) != fmode)
901 		goto no_delegation_unlock;
902 
903 	if (delegation == NULL)
904 		delegation = &deleg_cur->stateid;
905 	else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
906 		goto no_delegation_unlock;
907 
908 	nfs_mark_delegation_referenced(deleg_cur);
909 	__update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
910 	ret = 1;
911 no_delegation_unlock:
912 	spin_unlock(&deleg_cur->lock);
913 no_delegation:
914 	rcu_read_unlock();
915 
916 	if (!ret && open_stateid != NULL) {
917 		__update_open_stateid(state, open_stateid, NULL, fmode);
918 		ret = 1;
919 	}
920 
921 	return ret;
922 }
923 
924 
925 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
926 {
927 	struct nfs_delegation *delegation;
928 
929 	rcu_read_lock();
930 	delegation = rcu_dereference(NFS_I(inode)->delegation);
931 	if (delegation == NULL || (delegation->type & fmode) == fmode) {
932 		rcu_read_unlock();
933 		return;
934 	}
935 	rcu_read_unlock();
936 	nfs_inode_return_delegation(inode);
937 }
938 
939 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
940 {
941 	struct nfs4_state *state = opendata->state;
942 	struct nfs_inode *nfsi = NFS_I(state->inode);
943 	struct nfs_delegation *delegation;
944 	int open_mode = opendata->o_arg.open_flags & O_EXCL;
945 	fmode_t fmode = opendata->o_arg.fmode;
946 	nfs4_stateid stateid;
947 	int ret = -EAGAIN;
948 
949 	for (;;) {
950 		if (can_open_cached(state, fmode, open_mode)) {
951 			spin_lock(&state->owner->so_lock);
952 			if (can_open_cached(state, fmode, open_mode)) {
953 				update_open_stateflags(state, fmode);
954 				spin_unlock(&state->owner->so_lock);
955 				goto out_return_state;
956 			}
957 			spin_unlock(&state->owner->so_lock);
958 		}
959 		rcu_read_lock();
960 		delegation = rcu_dereference(nfsi->delegation);
961 		if (delegation == NULL ||
962 		    !can_open_delegated(delegation, fmode)) {
963 			rcu_read_unlock();
964 			break;
965 		}
966 		/* Save the delegation */
967 		memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
968 		rcu_read_unlock();
969 		ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
970 		if (ret != 0)
971 			goto out;
972 		ret = -EAGAIN;
973 
974 		/* Try to update the stateid using the delegation */
975 		if (update_open_stateid(state, NULL, &stateid, fmode))
976 			goto out_return_state;
977 	}
978 out:
979 	return ERR_PTR(ret);
980 out_return_state:
981 	atomic_inc(&state->count);
982 	return state;
983 }
984 
985 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
986 {
987 	struct inode *inode;
988 	struct nfs4_state *state = NULL;
989 	struct nfs_delegation *delegation;
990 	int ret;
991 
992 	if (!data->rpc_done) {
993 		state = nfs4_try_open_cached(data);
994 		goto out;
995 	}
996 
997 	ret = -EAGAIN;
998 	if (!(data->f_attr.valid & NFS_ATTR_FATTR))
999 		goto err;
1000 	inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1001 	ret = PTR_ERR(inode);
1002 	if (IS_ERR(inode))
1003 		goto err;
1004 	ret = -ENOMEM;
1005 	state = nfs4_get_open_state(inode, data->owner);
1006 	if (state == NULL)
1007 		goto err_put_inode;
1008 	if (data->o_res.delegation_type != 0) {
1009 		int delegation_flags = 0;
1010 
1011 		rcu_read_lock();
1012 		delegation = rcu_dereference(NFS_I(inode)->delegation);
1013 		if (delegation)
1014 			delegation_flags = delegation->flags;
1015 		rcu_read_unlock();
1016 		if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1017 			nfs_inode_set_delegation(state->inode,
1018 					data->owner->so_cred,
1019 					&data->o_res);
1020 		else
1021 			nfs_inode_reclaim_delegation(state->inode,
1022 					data->owner->so_cred,
1023 					&data->o_res);
1024 	}
1025 
1026 	update_open_stateid(state, &data->o_res.stateid, NULL,
1027 			data->o_arg.fmode);
1028 	iput(inode);
1029 out:
1030 	return state;
1031 err_put_inode:
1032 	iput(inode);
1033 err:
1034 	return ERR_PTR(ret);
1035 }
1036 
1037 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1038 {
1039 	struct nfs_inode *nfsi = NFS_I(state->inode);
1040 	struct nfs_open_context *ctx;
1041 
1042 	spin_lock(&state->inode->i_lock);
1043 	list_for_each_entry(ctx, &nfsi->open_files, list) {
1044 		if (ctx->state != state)
1045 			continue;
1046 		get_nfs_open_context(ctx);
1047 		spin_unlock(&state->inode->i_lock);
1048 		return ctx;
1049 	}
1050 	spin_unlock(&state->inode->i_lock);
1051 	return ERR_PTR(-ENOENT);
1052 }
1053 
1054 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1055 {
1056 	struct nfs4_opendata *opendata;
1057 
1058 	opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1059 	if (opendata == NULL)
1060 		return ERR_PTR(-ENOMEM);
1061 	opendata->state = state;
1062 	atomic_inc(&state->count);
1063 	return opendata;
1064 }
1065 
1066 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1067 {
1068 	struct nfs4_state *newstate;
1069 	int ret;
1070 
1071 	opendata->o_arg.open_flags = 0;
1072 	opendata->o_arg.fmode = fmode;
1073 	memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1074 	memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1075 	nfs4_init_opendata_res(opendata);
1076 	ret = _nfs4_recover_proc_open(opendata);
1077 	if (ret != 0)
1078 		return ret;
1079 	newstate = nfs4_opendata_to_nfs4_state(opendata);
1080 	if (IS_ERR(newstate))
1081 		return PTR_ERR(newstate);
1082 	nfs4_close_state(&opendata->path, newstate, fmode);
1083 	*res = newstate;
1084 	return 0;
1085 }
1086 
1087 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1088 {
1089 	struct nfs4_state *newstate;
1090 	int ret;
1091 
1092 	/* memory barrier prior to reading state->n_* */
1093 	clear_bit(NFS_DELEGATED_STATE, &state->flags);
1094 	smp_rmb();
1095 	if (state->n_rdwr != 0) {
1096 		ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1097 		if (ret != 0)
1098 			return ret;
1099 		if (newstate != state)
1100 			return -ESTALE;
1101 	}
1102 	if (state->n_wronly != 0) {
1103 		ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1104 		if (ret != 0)
1105 			return ret;
1106 		if (newstate != state)
1107 			return -ESTALE;
1108 	}
1109 	if (state->n_rdonly != 0) {
1110 		ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1111 		if (ret != 0)
1112 			return ret;
1113 		if (newstate != state)
1114 			return -ESTALE;
1115 	}
1116 	/*
1117 	 * We may have performed cached opens for all three recoveries.
1118 	 * Check if we need to update the current stateid.
1119 	 */
1120 	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1121 	    memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1122 		write_seqlock(&state->seqlock);
1123 		if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1124 			memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1125 		write_sequnlock(&state->seqlock);
1126 	}
1127 	return 0;
1128 }
1129 
1130 /*
1131  * OPEN_RECLAIM:
1132  * 	reclaim state on the server after a reboot.
1133  */
1134 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1135 {
1136 	struct nfs_delegation *delegation;
1137 	struct nfs4_opendata *opendata;
1138 	fmode_t delegation_type = 0;
1139 	int status;
1140 
1141 	opendata = nfs4_open_recoverdata_alloc(ctx, state);
1142 	if (IS_ERR(opendata))
1143 		return PTR_ERR(opendata);
1144 	opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1145 	opendata->o_arg.fh = NFS_FH(state->inode);
1146 	rcu_read_lock();
1147 	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1148 	if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1149 		delegation_type = delegation->type;
1150 	rcu_read_unlock();
1151 	opendata->o_arg.u.delegation_type = delegation_type;
1152 	status = nfs4_open_recover(opendata, state);
1153 	nfs4_opendata_put(opendata);
1154 	return status;
1155 }
1156 
1157 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1158 {
1159 	struct nfs_server *server = NFS_SERVER(state->inode);
1160 	struct nfs4_exception exception = { };
1161 	int err;
1162 	do {
1163 		err = _nfs4_do_open_reclaim(ctx, state);
1164 		if (err != -NFS4ERR_DELAY)
1165 			break;
1166 		nfs4_handle_exception(server, err, &exception);
1167 	} while (exception.retry);
1168 	return err;
1169 }
1170 
1171 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1172 {
1173 	struct nfs_open_context *ctx;
1174 	int ret;
1175 
1176 	ctx = nfs4_state_find_open_context(state);
1177 	if (IS_ERR(ctx))
1178 		return PTR_ERR(ctx);
1179 	ret = nfs4_do_open_reclaim(ctx, state);
1180 	put_nfs_open_context(ctx);
1181 	return ret;
1182 }
1183 
1184 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1185 {
1186 	struct nfs4_opendata *opendata;
1187 	int ret;
1188 
1189 	opendata = nfs4_open_recoverdata_alloc(ctx, state);
1190 	if (IS_ERR(opendata))
1191 		return PTR_ERR(opendata);
1192 	opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1193 	memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1194 			sizeof(opendata->o_arg.u.delegation.data));
1195 	ret = nfs4_open_recover(opendata, state);
1196 	nfs4_opendata_put(opendata);
1197 	return ret;
1198 }
1199 
1200 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1201 {
1202 	struct nfs4_exception exception = { };
1203 	struct nfs_server *server = NFS_SERVER(state->inode);
1204 	int err;
1205 	do {
1206 		err = _nfs4_open_delegation_recall(ctx, state, stateid);
1207 		switch (err) {
1208 			case 0:
1209 			case -ENOENT:
1210 			case -ESTALE:
1211 				goto out;
1212 			case -NFS4ERR_BADSESSION:
1213 			case -NFS4ERR_BADSLOT:
1214 			case -NFS4ERR_BAD_HIGH_SLOT:
1215 			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1216 			case -NFS4ERR_DEADSESSION:
1217 				nfs4_schedule_state_recovery(
1218 					server->nfs_client);
1219 				goto out;
1220 			case -NFS4ERR_STALE_CLIENTID:
1221 			case -NFS4ERR_STALE_STATEID:
1222 			case -NFS4ERR_EXPIRED:
1223 				/* Don't recall a delegation if it was lost */
1224 				nfs4_schedule_state_recovery(server->nfs_client);
1225 				goto out;
1226 			case -ERESTARTSYS:
1227 				/*
1228 				 * The show must go on: exit, but mark the
1229 				 * stateid as needing recovery.
1230 				 */
1231 			case -NFS4ERR_ADMIN_REVOKED:
1232 			case -NFS4ERR_BAD_STATEID:
1233 				nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1234 			case -ENOMEM:
1235 				err = 0;
1236 				goto out;
1237 		}
1238 		err = nfs4_handle_exception(server, err, &exception);
1239 	} while (exception.retry);
1240 out:
1241 	return err;
1242 }
1243 
1244 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1245 {
1246 	struct nfs4_opendata *data = calldata;
1247 
1248 	data->rpc_status = task->tk_status;
1249 	if (RPC_ASSASSINATED(task))
1250 		return;
1251 	if (data->rpc_status == 0) {
1252 		memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1253 				sizeof(data->o_res.stateid.data));
1254 		nfs_confirm_seqid(&data->owner->so_seqid, 0);
1255 		renew_lease(data->o_res.server, data->timestamp);
1256 		data->rpc_done = 1;
1257 	}
1258 }
1259 
1260 static void nfs4_open_confirm_release(void *calldata)
1261 {
1262 	struct nfs4_opendata *data = calldata;
1263 	struct nfs4_state *state = NULL;
1264 
1265 	/* If this request hasn't been cancelled, do nothing */
1266 	if (data->cancelled == 0)
1267 		goto out_free;
1268 	/* In case of error, no cleanup! */
1269 	if (!data->rpc_done)
1270 		goto out_free;
1271 	state = nfs4_opendata_to_nfs4_state(data);
1272 	if (!IS_ERR(state))
1273 		nfs4_close_state(&data->path, state, data->o_arg.fmode);
1274 out_free:
1275 	nfs4_opendata_put(data);
1276 }
1277 
1278 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1279 	.rpc_call_done = nfs4_open_confirm_done,
1280 	.rpc_release = nfs4_open_confirm_release,
1281 };
1282 
1283 /*
1284  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1285  */
1286 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1287 {
1288 	struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1289 	struct rpc_task *task;
1290 	struct  rpc_message msg = {
1291 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1292 		.rpc_argp = &data->c_arg,
1293 		.rpc_resp = &data->c_res,
1294 		.rpc_cred = data->owner->so_cred,
1295 	};
1296 	struct rpc_task_setup task_setup_data = {
1297 		.rpc_client = server->client,
1298 		.rpc_message = &msg,
1299 		.callback_ops = &nfs4_open_confirm_ops,
1300 		.callback_data = data,
1301 		.workqueue = nfsiod_workqueue,
1302 		.flags = RPC_TASK_ASYNC,
1303 	};
1304 	int status;
1305 
1306 	kref_get(&data->kref);
1307 	data->rpc_done = 0;
1308 	data->rpc_status = 0;
1309 	data->timestamp = jiffies;
1310 	task = rpc_run_task(&task_setup_data);
1311 	if (IS_ERR(task))
1312 		return PTR_ERR(task);
1313 	status = nfs4_wait_for_completion_rpc_task(task);
1314 	if (status != 0) {
1315 		data->cancelled = 1;
1316 		smp_wmb();
1317 	} else
1318 		status = data->rpc_status;
1319 	rpc_put_task(task);
1320 	return status;
1321 }
1322 
1323 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1324 {
1325 	struct nfs4_opendata *data = calldata;
1326 	struct nfs4_state_owner *sp = data->owner;
1327 
1328 	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1329 		return;
1330 	/*
1331 	 * Check if we still need to send an OPEN call, or if we can use
1332 	 * a delegation instead.
1333 	 */
1334 	if (data->state != NULL) {
1335 		struct nfs_delegation *delegation;
1336 
1337 		if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1338 			goto out_no_action;
1339 		rcu_read_lock();
1340 		delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1341 		if (delegation != NULL &&
1342 		    test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1343 			rcu_read_unlock();
1344 			goto out_no_action;
1345 		}
1346 		rcu_read_unlock();
1347 	}
1348 	/* Update sequence id. */
1349 	data->o_arg.id = sp->so_owner_id.id;
1350 	data->o_arg.clientid = sp->so_client->cl_clientid;
1351 	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1352 		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1353 		nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1354 	}
1355 	data->timestamp = jiffies;
1356 	if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1357 				&data->o_arg.seq_args,
1358 				&data->o_res.seq_res, 1, task))
1359 		return;
1360 	rpc_call_start(task);
1361 	return;
1362 out_no_action:
1363 	task->tk_action = NULL;
1364 
1365 }
1366 
1367 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1368 {
1369 	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1370 	nfs4_open_prepare(task, calldata);
1371 }
1372 
1373 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1374 {
1375 	struct nfs4_opendata *data = calldata;
1376 
1377 	data->rpc_status = task->tk_status;
1378 
1379 	nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1380 			task->tk_status);
1381 
1382 	if (RPC_ASSASSINATED(task))
1383 		return;
1384 	if (task->tk_status == 0) {
1385 		switch (data->o_res.f_attr->mode & S_IFMT) {
1386 			case S_IFREG:
1387 				break;
1388 			case S_IFLNK:
1389 				data->rpc_status = -ELOOP;
1390 				break;
1391 			case S_IFDIR:
1392 				data->rpc_status = -EISDIR;
1393 				break;
1394 			default:
1395 				data->rpc_status = -ENOTDIR;
1396 		}
1397 		renew_lease(data->o_res.server, data->timestamp);
1398 		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1399 			nfs_confirm_seqid(&data->owner->so_seqid, 0);
1400 	}
1401 	data->rpc_done = 1;
1402 }
1403 
1404 static void nfs4_open_release(void *calldata)
1405 {
1406 	struct nfs4_opendata *data = calldata;
1407 	struct nfs4_state *state = NULL;
1408 
1409 	/* If this request hasn't been cancelled, do nothing */
1410 	if (data->cancelled == 0)
1411 		goto out_free;
1412 	/* In case of error, no cleanup! */
1413 	if (data->rpc_status != 0 || !data->rpc_done)
1414 		goto out_free;
1415 	/* In case we need an open_confirm, no cleanup! */
1416 	if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1417 		goto out_free;
1418 	state = nfs4_opendata_to_nfs4_state(data);
1419 	if (!IS_ERR(state))
1420 		nfs4_close_state(&data->path, state, data->o_arg.fmode);
1421 out_free:
1422 	nfs4_opendata_put(data);
1423 }
1424 
1425 static const struct rpc_call_ops nfs4_open_ops = {
1426 	.rpc_call_prepare = nfs4_open_prepare,
1427 	.rpc_call_done = nfs4_open_done,
1428 	.rpc_release = nfs4_open_release,
1429 };
1430 
1431 static const struct rpc_call_ops nfs4_recover_open_ops = {
1432 	.rpc_call_prepare = nfs4_recover_open_prepare,
1433 	.rpc_call_done = nfs4_open_done,
1434 	.rpc_release = nfs4_open_release,
1435 };
1436 
1437 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1438 {
1439 	struct inode *dir = data->dir->d_inode;
1440 	struct nfs_server *server = NFS_SERVER(dir);
1441 	struct nfs_openargs *o_arg = &data->o_arg;
1442 	struct nfs_openres *o_res = &data->o_res;
1443 	struct rpc_task *task;
1444 	struct rpc_message msg = {
1445 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1446 		.rpc_argp = o_arg,
1447 		.rpc_resp = o_res,
1448 		.rpc_cred = data->owner->so_cred,
1449 	};
1450 	struct rpc_task_setup task_setup_data = {
1451 		.rpc_client = server->client,
1452 		.rpc_message = &msg,
1453 		.callback_ops = &nfs4_open_ops,
1454 		.callback_data = data,
1455 		.workqueue = nfsiod_workqueue,
1456 		.flags = RPC_TASK_ASYNC,
1457 	};
1458 	int status;
1459 
1460 	kref_get(&data->kref);
1461 	data->rpc_done = 0;
1462 	data->rpc_status = 0;
1463 	data->cancelled = 0;
1464 	if (isrecover)
1465 		task_setup_data.callback_ops = &nfs4_recover_open_ops;
1466 	task = rpc_run_task(&task_setup_data);
1467         if (IS_ERR(task))
1468                 return PTR_ERR(task);
1469         status = nfs4_wait_for_completion_rpc_task(task);
1470         if (status != 0) {
1471                 data->cancelled = 1;
1472                 smp_wmb();
1473         } else
1474                 status = data->rpc_status;
1475         rpc_put_task(task);
1476 
1477 	return status;
1478 }
1479 
1480 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1481 {
1482 	struct inode *dir = data->dir->d_inode;
1483 	struct nfs_openres *o_res = &data->o_res;
1484         int status;
1485 
1486 	status = nfs4_run_open_task(data, 1);
1487 	if (status != 0 || !data->rpc_done)
1488 		return status;
1489 
1490 	nfs_refresh_inode(dir, o_res->dir_attr);
1491 
1492 	if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1493 		status = _nfs4_proc_open_confirm(data);
1494 		if (status != 0)
1495 			return status;
1496 	}
1497 
1498 	return status;
1499 }
1500 
1501 /*
1502  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1503  */
1504 static int _nfs4_proc_open(struct nfs4_opendata *data)
1505 {
1506 	struct inode *dir = data->dir->d_inode;
1507 	struct nfs_server *server = NFS_SERVER(dir);
1508 	struct nfs_openargs *o_arg = &data->o_arg;
1509 	struct nfs_openres *o_res = &data->o_res;
1510 	int status;
1511 
1512 	status = nfs4_run_open_task(data, 0);
1513 	if (status != 0 || !data->rpc_done)
1514 		return status;
1515 
1516 	if (o_arg->open_flags & O_CREAT) {
1517 		update_changeattr(dir, &o_res->cinfo);
1518 		nfs_post_op_update_inode(dir, o_res->dir_attr);
1519 	} else
1520 		nfs_refresh_inode(dir, o_res->dir_attr);
1521 	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1522 		status = _nfs4_proc_open_confirm(data);
1523 		if (status != 0)
1524 			return status;
1525 	}
1526 	if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1527 		_nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1528 	return 0;
1529 }
1530 
1531 static int nfs4_recover_expired_lease(struct nfs_server *server)
1532 {
1533 	struct nfs_client *clp = server->nfs_client;
1534 	unsigned int loop;
1535 	int ret;
1536 
1537 	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1538 		ret = nfs4_wait_clnt_recover(clp);
1539 		if (ret != 0)
1540 			break;
1541 		if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1542 		    !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1543 			break;
1544 		nfs4_schedule_state_recovery(clp);
1545 		ret = -EIO;
1546 	}
1547 	return ret;
1548 }
1549 
1550 /*
1551  * OPEN_EXPIRED:
1552  * 	reclaim state on the server after a network partition.
1553  * 	Assumes caller holds the appropriate lock
1554  */
1555 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1556 {
1557 	struct nfs4_opendata *opendata;
1558 	int ret;
1559 
1560 	opendata = nfs4_open_recoverdata_alloc(ctx, state);
1561 	if (IS_ERR(opendata))
1562 		return PTR_ERR(opendata);
1563 	ret = nfs4_open_recover(opendata, state);
1564 	if (ret == -ESTALE)
1565 		d_drop(ctx->path.dentry);
1566 	nfs4_opendata_put(opendata);
1567 	return ret;
1568 }
1569 
1570 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1571 {
1572 	struct nfs_server *server = NFS_SERVER(state->inode);
1573 	struct nfs4_exception exception = { };
1574 	int err;
1575 
1576 	do {
1577 		err = _nfs4_open_expired(ctx, state);
1578 		switch (err) {
1579 		default:
1580 			goto out;
1581 		case -NFS4ERR_GRACE:
1582 		case -NFS4ERR_DELAY:
1583 			nfs4_handle_exception(server, err, &exception);
1584 			err = 0;
1585 		}
1586 	} while (exception.retry);
1587 out:
1588 	return err;
1589 }
1590 
1591 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1592 {
1593 	struct nfs_open_context *ctx;
1594 	int ret;
1595 
1596 	ctx = nfs4_state_find_open_context(state);
1597 	if (IS_ERR(ctx))
1598 		return PTR_ERR(ctx);
1599 	ret = nfs4_do_open_expired(ctx, state);
1600 	put_nfs_open_context(ctx);
1601 	return ret;
1602 }
1603 
1604 /*
1605  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1606  * fields corresponding to attributes that were used to store the verifier.
1607  * Make sure we clobber those fields in the later setattr call
1608  */
1609 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1610 {
1611 	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1612 	    !(sattr->ia_valid & ATTR_ATIME_SET))
1613 		sattr->ia_valid |= ATTR_ATIME;
1614 
1615 	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1616 	    !(sattr->ia_valid & ATTR_MTIME_SET))
1617 		sattr->ia_valid |= ATTR_MTIME;
1618 }
1619 
1620 /*
1621  * Returns a referenced nfs4_state
1622  */
1623 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1624 {
1625 	struct nfs4_state_owner  *sp;
1626 	struct nfs4_state     *state = NULL;
1627 	struct nfs_server       *server = NFS_SERVER(dir);
1628 	struct nfs4_opendata *opendata;
1629 	int status;
1630 
1631 	/* Protect against reboot recovery conflicts */
1632 	status = -ENOMEM;
1633 	if (!(sp = nfs4_get_state_owner(server, cred))) {
1634 		dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1635 		goto out_err;
1636 	}
1637 	status = nfs4_recover_expired_lease(server);
1638 	if (status != 0)
1639 		goto err_put_state_owner;
1640 	if (path->dentry->d_inode != NULL)
1641 		nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1642 	status = -ENOMEM;
1643 	opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1644 	if (opendata == NULL)
1645 		goto err_put_state_owner;
1646 
1647 	if (path->dentry->d_inode != NULL)
1648 		opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1649 
1650 	status = _nfs4_proc_open(opendata);
1651 	if (status != 0)
1652 		goto err_opendata_put;
1653 
1654 	if (opendata->o_arg.open_flags & O_EXCL)
1655 		nfs4_exclusive_attrset(opendata, sattr);
1656 
1657 	state = nfs4_opendata_to_nfs4_state(opendata);
1658 	status = PTR_ERR(state);
1659 	if (IS_ERR(state))
1660 		goto err_opendata_put;
1661 	nfs4_opendata_put(opendata);
1662 	nfs4_put_state_owner(sp);
1663 	*res = state;
1664 	return 0;
1665 err_opendata_put:
1666 	nfs4_opendata_put(opendata);
1667 err_put_state_owner:
1668 	nfs4_put_state_owner(sp);
1669 out_err:
1670 	*res = NULL;
1671 	return status;
1672 }
1673 
1674 
1675 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1676 {
1677 	struct nfs4_exception exception = { };
1678 	struct nfs4_state *res;
1679 	int status;
1680 
1681 	do {
1682 		status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1683 		if (status == 0)
1684 			break;
1685 		/* NOTE: BAD_SEQID means the server and client disagree about the
1686 		 * book-keeping w.r.t. state-changing operations
1687 		 * (OPEN/CLOSE/LOCK/LOCKU...)
1688 		 * It is actually a sign of a bug on the client or on the server.
1689 		 *
1690 		 * If we receive a BAD_SEQID error in the particular case of
1691 		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1692 		 * have unhashed the old state_owner for us, and that we can
1693 		 * therefore safely retry using a new one. We should still warn
1694 		 * the user though...
1695 		 */
1696 		if (status == -NFS4ERR_BAD_SEQID) {
1697 			printk(KERN_WARNING "NFS: v4 server %s "
1698 					" returned a bad sequence-id error!\n",
1699 					NFS_SERVER(dir)->nfs_client->cl_hostname);
1700 			exception.retry = 1;
1701 			continue;
1702 		}
1703 		/*
1704 		 * BAD_STATEID on OPEN means that the server cancelled our
1705 		 * state before it received the OPEN_CONFIRM.
1706 		 * Recover by retrying the request as per the discussion
1707 		 * on Page 181 of RFC3530.
1708 		 */
1709 		if (status == -NFS4ERR_BAD_STATEID) {
1710 			exception.retry = 1;
1711 			continue;
1712 		}
1713 		if (status == -EAGAIN) {
1714 			/* We must have found a delegation */
1715 			exception.retry = 1;
1716 			continue;
1717 		}
1718 		res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1719 					status, &exception));
1720 	} while (exception.retry);
1721 	return res;
1722 }
1723 
1724 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1725 			    struct nfs_fattr *fattr, struct iattr *sattr,
1726 			    struct nfs4_state *state)
1727 {
1728 	struct nfs_server *server = NFS_SERVER(inode);
1729         struct nfs_setattrargs  arg = {
1730                 .fh             = NFS_FH(inode),
1731                 .iap            = sattr,
1732 		.server		= server,
1733 		.bitmask = server->attr_bitmask,
1734         };
1735         struct nfs_setattrres  res = {
1736 		.fattr		= fattr,
1737 		.server		= server,
1738         };
1739         struct rpc_message msg = {
1740 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1741 		.rpc_argp	= &arg,
1742 		.rpc_resp	= &res,
1743 		.rpc_cred	= cred,
1744         };
1745 	unsigned long timestamp = jiffies;
1746 	int status;
1747 
1748 	nfs_fattr_init(fattr);
1749 
1750 	if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1751 		/* Use that stateid */
1752 	} else if (state != NULL) {
1753 		nfs4_copy_stateid(&arg.stateid, state, current->files);
1754 	} else
1755 		memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1756 
1757 	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1758 	if (status == 0 && state != NULL)
1759 		renew_lease(server, timestamp);
1760 	return status;
1761 }
1762 
1763 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1764 			   struct nfs_fattr *fattr, struct iattr *sattr,
1765 			   struct nfs4_state *state)
1766 {
1767 	struct nfs_server *server = NFS_SERVER(inode);
1768 	struct nfs4_exception exception = { };
1769 	int err;
1770 	do {
1771 		err = nfs4_handle_exception(server,
1772 				_nfs4_do_setattr(inode, cred, fattr, sattr, state),
1773 				&exception);
1774 	} while (exception.retry);
1775 	return err;
1776 }
1777 
1778 struct nfs4_closedata {
1779 	struct path path;
1780 	struct inode *inode;
1781 	struct nfs4_state *state;
1782 	struct nfs_closeargs arg;
1783 	struct nfs_closeres res;
1784 	struct nfs_fattr fattr;
1785 	unsigned long timestamp;
1786 };
1787 
1788 static void nfs4_free_closedata(void *data)
1789 {
1790 	struct nfs4_closedata *calldata = data;
1791 	struct nfs4_state_owner *sp = calldata->state->owner;
1792 
1793 	nfs4_put_open_state(calldata->state);
1794 	nfs_free_seqid(calldata->arg.seqid);
1795 	nfs4_put_state_owner(sp);
1796 	path_put(&calldata->path);
1797 	kfree(calldata);
1798 }
1799 
1800 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1801 		fmode_t fmode)
1802 {
1803 	spin_lock(&state->owner->so_lock);
1804 	if (!(fmode & FMODE_READ))
1805 		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1806 	if (!(fmode & FMODE_WRITE))
1807 		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1808 	clear_bit(NFS_O_RDWR_STATE, &state->flags);
1809 	spin_unlock(&state->owner->so_lock);
1810 }
1811 
1812 static void nfs4_close_done(struct rpc_task *task, void *data)
1813 {
1814 	struct nfs4_closedata *calldata = data;
1815 	struct nfs4_state *state = calldata->state;
1816 	struct nfs_server *server = NFS_SERVER(calldata->inode);
1817 
1818 	nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1819 	if (RPC_ASSASSINATED(task))
1820 		return;
1821         /* hmm. we are done with the inode, and in the process of freeing
1822 	 * the state_owner. we keep this around to process errors
1823 	 */
1824 	switch (task->tk_status) {
1825 		case 0:
1826 			nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1827 			renew_lease(server, calldata->timestamp);
1828 			nfs4_close_clear_stateid_flags(state,
1829 					calldata->arg.fmode);
1830 			break;
1831 		case -NFS4ERR_STALE_STATEID:
1832 		case -NFS4ERR_OLD_STATEID:
1833 		case -NFS4ERR_BAD_STATEID:
1834 		case -NFS4ERR_EXPIRED:
1835 			if (calldata->arg.fmode == 0)
1836 				break;
1837 		default:
1838 			if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1839 				rpc_restart_call_prepare(task);
1840 	}
1841 	nfs_release_seqid(calldata->arg.seqid);
1842 	nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1843 }
1844 
1845 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1846 {
1847 	struct nfs4_closedata *calldata = data;
1848 	struct nfs4_state *state = calldata->state;
1849 	int call_close = 0;
1850 
1851 	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1852 		return;
1853 
1854 	task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1855 	calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1856 	spin_lock(&state->owner->so_lock);
1857 	/* Calculate the change in open mode */
1858 	if (state->n_rdwr == 0) {
1859 		if (state->n_rdonly == 0) {
1860 			call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1861 			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1862 			calldata->arg.fmode &= ~FMODE_READ;
1863 		}
1864 		if (state->n_wronly == 0) {
1865 			call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1866 			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1867 			calldata->arg.fmode &= ~FMODE_WRITE;
1868 		}
1869 	}
1870 	spin_unlock(&state->owner->so_lock);
1871 
1872 	if (!call_close) {
1873 		/* Note: exit _without_ calling nfs4_close_done */
1874 		task->tk_action = NULL;
1875 		return;
1876 	}
1877 
1878 	if (calldata->arg.fmode == 0)
1879 		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1880 
1881 	nfs_fattr_init(calldata->res.fattr);
1882 	calldata->timestamp = jiffies;
1883 	if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1884 				&calldata->arg.seq_args, &calldata->res.seq_res,
1885 				1, task))
1886 		return;
1887 	rpc_call_start(task);
1888 }
1889 
1890 static const struct rpc_call_ops nfs4_close_ops = {
1891 	.rpc_call_prepare = nfs4_close_prepare,
1892 	.rpc_call_done = nfs4_close_done,
1893 	.rpc_release = nfs4_free_closedata,
1894 };
1895 
1896 /*
1897  * It is possible for data to be read/written from a mem-mapped file
1898  * after the sys_close call (which hits the vfs layer as a flush).
1899  * This means that we can't safely call nfsv4 close on a file until
1900  * the inode is cleared. This in turn means that we are not good
1901  * NFSv4 citizens - we do not indicate to the server to update the file's
1902  * share state even when we are done with one of the three share
1903  * stateid's in the inode.
1904  *
1905  * NOTE: Caller must be holding the sp->so_owner semaphore!
1906  */
1907 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1908 {
1909 	struct nfs_server *server = NFS_SERVER(state->inode);
1910 	struct nfs4_closedata *calldata;
1911 	struct nfs4_state_owner *sp = state->owner;
1912 	struct rpc_task *task;
1913 	struct rpc_message msg = {
1914 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1915 		.rpc_cred = state->owner->so_cred,
1916 	};
1917 	struct rpc_task_setup task_setup_data = {
1918 		.rpc_client = server->client,
1919 		.rpc_message = &msg,
1920 		.callback_ops = &nfs4_close_ops,
1921 		.workqueue = nfsiod_workqueue,
1922 		.flags = RPC_TASK_ASYNC,
1923 	};
1924 	int status = -ENOMEM;
1925 
1926 	calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1927 	if (calldata == NULL)
1928 		goto out;
1929 	calldata->inode = state->inode;
1930 	calldata->state = state;
1931 	calldata->arg.fh = NFS_FH(state->inode);
1932 	calldata->arg.stateid = &state->open_stateid;
1933 	/* Serialization for the sequence id */
1934 	calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1935 	if (calldata->arg.seqid == NULL)
1936 		goto out_free_calldata;
1937 	calldata->arg.fmode = 0;
1938 	calldata->arg.bitmask = server->cache_consistency_bitmask;
1939 	calldata->res.fattr = &calldata->fattr;
1940 	calldata->res.seqid = calldata->arg.seqid;
1941 	calldata->res.server = server;
1942 	calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1943 	calldata->path.mnt = mntget(path->mnt);
1944 	calldata->path.dentry = dget(path->dentry);
1945 
1946 	msg.rpc_argp = &calldata->arg,
1947 	msg.rpc_resp = &calldata->res,
1948 	task_setup_data.callback_data = calldata;
1949 	task = rpc_run_task(&task_setup_data);
1950 	if (IS_ERR(task))
1951 		return PTR_ERR(task);
1952 	status = 0;
1953 	if (wait)
1954 		status = rpc_wait_for_completion_task(task);
1955 	rpc_put_task(task);
1956 	return status;
1957 out_free_calldata:
1958 	kfree(calldata);
1959 out:
1960 	nfs4_put_open_state(state);
1961 	nfs4_put_state_owner(sp);
1962 	return status;
1963 }
1964 
1965 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1966 {
1967 	struct file *filp;
1968 	int ret;
1969 
1970 	/* If the open_intent is for execute, we have an extra check to make */
1971 	if (fmode & FMODE_EXEC) {
1972 		ret = nfs_may_open(state->inode,
1973 				state->owner->so_cred,
1974 				nd->intent.open.flags);
1975 		if (ret < 0)
1976 			goto out_close;
1977 	}
1978 	filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1979 	if (!IS_ERR(filp)) {
1980 		struct nfs_open_context *ctx;
1981 		ctx = nfs_file_open_context(filp);
1982 		ctx->state = state;
1983 		return 0;
1984 	}
1985 	ret = PTR_ERR(filp);
1986 out_close:
1987 	nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1988 	return ret;
1989 }
1990 
1991 struct dentry *
1992 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1993 {
1994 	struct path path = {
1995 		.mnt = nd->path.mnt,
1996 		.dentry = dentry,
1997 	};
1998 	struct dentry *parent;
1999 	struct iattr attr;
2000 	struct rpc_cred *cred;
2001 	struct nfs4_state *state;
2002 	struct dentry *res;
2003 	fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2004 
2005 	if (nd->flags & LOOKUP_CREATE) {
2006 		attr.ia_mode = nd->intent.open.create_mode;
2007 		attr.ia_valid = ATTR_MODE;
2008 		if (!IS_POSIXACL(dir))
2009 			attr.ia_mode &= ~current_umask();
2010 	} else {
2011 		attr.ia_valid = 0;
2012 		BUG_ON(nd->intent.open.flags & O_CREAT);
2013 	}
2014 
2015 	cred = rpc_lookup_cred();
2016 	if (IS_ERR(cred))
2017 		return (struct dentry *)cred;
2018 	parent = dentry->d_parent;
2019 	/* Protect against concurrent sillydeletes */
2020 	nfs_block_sillyrename(parent);
2021 	state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2022 	put_rpccred(cred);
2023 	if (IS_ERR(state)) {
2024 		if (PTR_ERR(state) == -ENOENT) {
2025 			d_add(dentry, NULL);
2026 			nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2027 		}
2028 		nfs_unblock_sillyrename(parent);
2029 		return (struct dentry *)state;
2030 	}
2031 	res = d_add_unique(dentry, igrab(state->inode));
2032 	if (res != NULL)
2033 		path.dentry = res;
2034 	nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2035 	nfs_unblock_sillyrename(parent);
2036 	nfs4_intent_set_file(nd, &path, state, fmode);
2037 	return res;
2038 }
2039 
2040 int
2041 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2042 {
2043 	struct path path = {
2044 		.mnt = nd->path.mnt,
2045 		.dentry = dentry,
2046 	};
2047 	struct rpc_cred *cred;
2048 	struct nfs4_state *state;
2049 	fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2050 
2051 	cred = rpc_lookup_cred();
2052 	if (IS_ERR(cred))
2053 		return PTR_ERR(cred);
2054 	state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2055 	put_rpccred(cred);
2056 	if (IS_ERR(state)) {
2057 		switch (PTR_ERR(state)) {
2058 			case -EPERM:
2059 			case -EACCES:
2060 			case -EDQUOT:
2061 			case -ENOSPC:
2062 			case -EROFS:
2063 				lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
2064 				return 1;
2065 			default:
2066 				goto out_drop;
2067 		}
2068 	}
2069 	if (state->inode == dentry->d_inode) {
2070 		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2071 		nfs4_intent_set_file(nd, &path, state, fmode);
2072 		return 1;
2073 	}
2074 	nfs4_close_sync(&path, state, fmode);
2075 out_drop:
2076 	d_drop(dentry);
2077 	return 0;
2078 }
2079 
2080 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2081 {
2082 	if (ctx->state == NULL)
2083 		return;
2084 	if (is_sync)
2085 		nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2086 	else
2087 		nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2088 }
2089 
2090 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2091 {
2092 	struct nfs4_server_caps_arg args = {
2093 		.fhandle = fhandle,
2094 	};
2095 	struct nfs4_server_caps_res res = {};
2096 	struct rpc_message msg = {
2097 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2098 		.rpc_argp = &args,
2099 		.rpc_resp = &res,
2100 	};
2101 	int status;
2102 
2103 	status = nfs4_call_sync(server, &msg, &args, &res, 0);
2104 	if (status == 0) {
2105 		memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2106 		server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2107 				NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2108 				NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2109 				NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2110 				NFS_CAP_CTIME|NFS_CAP_MTIME);
2111 		if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2112 			server->caps |= NFS_CAP_ACLS;
2113 		if (res.has_links != 0)
2114 			server->caps |= NFS_CAP_HARDLINKS;
2115 		if (res.has_symlinks != 0)
2116 			server->caps |= NFS_CAP_SYMLINKS;
2117 		if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2118 			server->caps |= NFS_CAP_FILEID;
2119 		if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2120 			server->caps |= NFS_CAP_MODE;
2121 		if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2122 			server->caps |= NFS_CAP_NLINK;
2123 		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2124 			server->caps |= NFS_CAP_OWNER;
2125 		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2126 			server->caps |= NFS_CAP_OWNER_GROUP;
2127 		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2128 			server->caps |= NFS_CAP_ATIME;
2129 		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2130 			server->caps |= NFS_CAP_CTIME;
2131 		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2132 			server->caps |= NFS_CAP_MTIME;
2133 
2134 		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2135 		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2136 		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2137 		server->acl_bitmask = res.acl_bitmask;
2138 	}
2139 
2140 	return status;
2141 }
2142 
2143 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2144 {
2145 	struct nfs4_exception exception = { };
2146 	int err;
2147 	do {
2148 		err = nfs4_handle_exception(server,
2149 				_nfs4_server_capabilities(server, fhandle),
2150 				&exception);
2151 	} while (exception.retry);
2152 	return err;
2153 }
2154 
2155 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2156 		struct nfs_fsinfo *info)
2157 {
2158 	struct nfs4_lookup_root_arg args = {
2159 		.bitmask = nfs4_fattr_bitmap,
2160 	};
2161 	struct nfs4_lookup_res res = {
2162 		.server = server,
2163 		.fattr = info->fattr,
2164 		.fh = fhandle,
2165 	};
2166 	struct rpc_message msg = {
2167 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2168 		.rpc_argp = &args,
2169 		.rpc_resp = &res,
2170 	};
2171 
2172 	nfs_fattr_init(info->fattr);
2173 	return nfs4_call_sync(server, &msg, &args, &res, 0);
2174 }
2175 
2176 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2177 		struct nfs_fsinfo *info)
2178 {
2179 	struct nfs4_exception exception = { };
2180 	int err;
2181 	do {
2182 		err = nfs4_handle_exception(server,
2183 				_nfs4_lookup_root(server, fhandle, info),
2184 				&exception);
2185 	} while (exception.retry);
2186 	return err;
2187 }
2188 
2189 /*
2190  * get the file handle for the "/" directory on the server
2191  */
2192 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2193 			      struct nfs_fsinfo *info)
2194 {
2195 	int status;
2196 
2197 	status = nfs4_lookup_root(server, fhandle, info);
2198 	if (status == 0)
2199 		status = nfs4_server_capabilities(server, fhandle);
2200 	if (status == 0)
2201 		status = nfs4_do_fsinfo(server, fhandle, info);
2202 	return nfs4_map_errors(status);
2203 }
2204 
2205 /*
2206  * Get locations and (maybe) other attributes of a referral.
2207  * Note that we'll actually follow the referral later when
2208  * we detect fsid mismatch in inode revalidation
2209  */
2210 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2211 {
2212 	int status = -ENOMEM;
2213 	struct page *page = NULL;
2214 	struct nfs4_fs_locations *locations = NULL;
2215 
2216 	page = alloc_page(GFP_KERNEL);
2217 	if (page == NULL)
2218 		goto out;
2219 	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2220 	if (locations == NULL)
2221 		goto out;
2222 
2223 	status = nfs4_proc_fs_locations(dir, name, locations, page);
2224 	if (status != 0)
2225 		goto out;
2226 	/* Make sure server returned a different fsid for the referral */
2227 	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2228 		dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2229 		status = -EIO;
2230 		goto out;
2231 	}
2232 
2233 	memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2234 	fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2235 	if (!fattr->mode)
2236 		fattr->mode = S_IFDIR;
2237 	memset(fhandle, 0, sizeof(struct nfs_fh));
2238 out:
2239 	if (page)
2240 		__free_page(page);
2241 	if (locations)
2242 		kfree(locations);
2243 	return status;
2244 }
2245 
2246 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2247 {
2248 	struct nfs4_getattr_arg args = {
2249 		.fh = fhandle,
2250 		.bitmask = server->attr_bitmask,
2251 	};
2252 	struct nfs4_getattr_res res = {
2253 		.fattr = fattr,
2254 		.server = server,
2255 	};
2256 	struct rpc_message msg = {
2257 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2258 		.rpc_argp = &args,
2259 		.rpc_resp = &res,
2260 	};
2261 
2262 	nfs_fattr_init(fattr);
2263 	return nfs4_call_sync(server, &msg, &args, &res, 0);
2264 }
2265 
2266 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2267 {
2268 	struct nfs4_exception exception = { };
2269 	int err;
2270 	do {
2271 		err = nfs4_handle_exception(server,
2272 				_nfs4_proc_getattr(server, fhandle, fattr),
2273 				&exception);
2274 	} while (exception.retry);
2275 	return err;
2276 }
2277 
2278 /*
2279  * The file is not closed if it is opened due to the a request to change
2280  * the size of the file. The open call will not be needed once the
2281  * VFS layer lookup-intents are implemented.
2282  *
2283  * Close is called when the inode is destroyed.
2284  * If we haven't opened the file for O_WRONLY, we
2285  * need to in the size_change case to obtain a stateid.
2286  *
2287  * Got race?
2288  * Because OPEN is always done by name in nfsv4, it is
2289  * possible that we opened a different file by the same
2290  * name.  We can recognize this race condition, but we
2291  * can't do anything about it besides returning an error.
2292  *
2293  * This will be fixed with VFS changes (lookup-intent).
2294  */
2295 static int
2296 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2297 		  struct iattr *sattr)
2298 {
2299 	struct inode *inode = dentry->d_inode;
2300 	struct rpc_cred *cred = NULL;
2301 	struct nfs4_state *state = NULL;
2302 	int status;
2303 
2304 	nfs_fattr_init(fattr);
2305 
2306 	/* Search for an existing open(O_WRITE) file */
2307 	if (sattr->ia_valid & ATTR_FILE) {
2308 		struct nfs_open_context *ctx;
2309 
2310 		ctx = nfs_file_open_context(sattr->ia_file);
2311 		if (ctx) {
2312 			cred = ctx->cred;
2313 			state = ctx->state;
2314 		}
2315 	}
2316 
2317 	status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2318 	if (status == 0)
2319 		nfs_setattr_update_inode(inode, sattr);
2320 	return status;
2321 }
2322 
2323 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2324 		const struct qstr *name, struct nfs_fh *fhandle,
2325 		struct nfs_fattr *fattr)
2326 {
2327 	int		       status;
2328 	struct nfs4_lookup_arg args = {
2329 		.bitmask = server->attr_bitmask,
2330 		.dir_fh = dirfh,
2331 		.name = name,
2332 	};
2333 	struct nfs4_lookup_res res = {
2334 		.server = server,
2335 		.fattr = fattr,
2336 		.fh = fhandle,
2337 	};
2338 	struct rpc_message msg = {
2339 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2340 		.rpc_argp = &args,
2341 		.rpc_resp = &res,
2342 	};
2343 
2344 	nfs_fattr_init(fattr);
2345 
2346 	dprintk("NFS call  lookupfh %s\n", name->name);
2347 	status = nfs4_call_sync(server, &msg, &args, &res, 0);
2348 	dprintk("NFS reply lookupfh: %d\n", status);
2349 	return status;
2350 }
2351 
2352 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2353 			      struct qstr *name, struct nfs_fh *fhandle,
2354 			      struct nfs_fattr *fattr)
2355 {
2356 	struct nfs4_exception exception = { };
2357 	int err;
2358 	do {
2359 		err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2360 		/* FIXME: !!!! */
2361 		if (err == -NFS4ERR_MOVED) {
2362 			err = -EREMOTE;
2363 			break;
2364 		}
2365 		err = nfs4_handle_exception(server, err, &exception);
2366 	} while (exception.retry);
2367 	return err;
2368 }
2369 
2370 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2371 		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2372 {
2373 	int status;
2374 
2375 	dprintk("NFS call  lookup %s\n", name->name);
2376 	status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2377 	if (status == -NFS4ERR_MOVED)
2378 		status = nfs4_get_referral(dir, name, fattr, fhandle);
2379 	dprintk("NFS reply lookup: %d\n", status);
2380 	return status;
2381 }
2382 
2383 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2384 {
2385 	struct nfs4_exception exception = { };
2386 	int err;
2387 	do {
2388 		err = nfs4_handle_exception(NFS_SERVER(dir),
2389 				_nfs4_proc_lookup(dir, name, fhandle, fattr),
2390 				&exception);
2391 	} while (exception.retry);
2392 	return err;
2393 }
2394 
2395 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2396 {
2397 	struct nfs_server *server = NFS_SERVER(inode);
2398 	struct nfs_fattr fattr;
2399 	struct nfs4_accessargs args = {
2400 		.fh = NFS_FH(inode),
2401 		.bitmask = server->attr_bitmask,
2402 	};
2403 	struct nfs4_accessres res = {
2404 		.server = server,
2405 		.fattr = &fattr,
2406 	};
2407 	struct rpc_message msg = {
2408 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2409 		.rpc_argp = &args,
2410 		.rpc_resp = &res,
2411 		.rpc_cred = entry->cred,
2412 	};
2413 	int mode = entry->mask;
2414 	int status;
2415 
2416 	/*
2417 	 * Determine which access bits we want to ask for...
2418 	 */
2419 	if (mode & MAY_READ)
2420 		args.access |= NFS4_ACCESS_READ;
2421 	if (S_ISDIR(inode->i_mode)) {
2422 		if (mode & MAY_WRITE)
2423 			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2424 		if (mode & MAY_EXEC)
2425 			args.access |= NFS4_ACCESS_LOOKUP;
2426 	} else {
2427 		if (mode & MAY_WRITE)
2428 			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2429 		if (mode & MAY_EXEC)
2430 			args.access |= NFS4_ACCESS_EXECUTE;
2431 	}
2432 	nfs_fattr_init(&fattr);
2433 	status = nfs4_call_sync(server, &msg, &args, &res, 0);
2434 	if (!status) {
2435 		entry->mask = 0;
2436 		if (res.access & NFS4_ACCESS_READ)
2437 			entry->mask |= MAY_READ;
2438 		if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2439 			entry->mask |= MAY_WRITE;
2440 		if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2441 			entry->mask |= MAY_EXEC;
2442 		nfs_refresh_inode(inode, &fattr);
2443 	}
2444 	return status;
2445 }
2446 
2447 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2448 {
2449 	struct nfs4_exception exception = { };
2450 	int err;
2451 	do {
2452 		err = nfs4_handle_exception(NFS_SERVER(inode),
2453 				_nfs4_proc_access(inode, entry),
2454 				&exception);
2455 	} while (exception.retry);
2456 	return err;
2457 }
2458 
2459 /*
2460  * TODO: For the time being, we don't try to get any attributes
2461  * along with any of the zero-copy operations READ, READDIR,
2462  * READLINK, WRITE.
2463  *
2464  * In the case of the first three, we want to put the GETATTR
2465  * after the read-type operation -- this is because it is hard
2466  * to predict the length of a GETATTR response in v4, and thus
2467  * align the READ data correctly.  This means that the GETATTR
2468  * may end up partially falling into the page cache, and we should
2469  * shift it into the 'tail' of the xdr_buf before processing.
2470  * To do this efficiently, we need to know the total length
2471  * of data received, which doesn't seem to be available outside
2472  * of the RPC layer.
2473  *
2474  * In the case of WRITE, we also want to put the GETATTR after
2475  * the operation -- in this case because we want to make sure
2476  * we get the post-operation mtime and size.  This means that
2477  * we can't use xdr_encode_pages() as written: we need a variant
2478  * of it which would leave room in the 'tail' iovec.
2479  *
2480  * Both of these changes to the XDR layer would in fact be quite
2481  * minor, but I decided to leave them for a subsequent patch.
2482  */
2483 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2484 		unsigned int pgbase, unsigned int pglen)
2485 {
2486 	struct nfs4_readlink args = {
2487 		.fh       = NFS_FH(inode),
2488 		.pgbase	  = pgbase,
2489 		.pglen    = pglen,
2490 		.pages    = &page,
2491 	};
2492 	struct nfs4_readlink_res res;
2493 	struct rpc_message msg = {
2494 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2495 		.rpc_argp = &args,
2496 		.rpc_resp = &res,
2497 	};
2498 
2499 	return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2500 }
2501 
2502 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2503 		unsigned int pgbase, unsigned int pglen)
2504 {
2505 	struct nfs4_exception exception = { };
2506 	int err;
2507 	do {
2508 		err = nfs4_handle_exception(NFS_SERVER(inode),
2509 				_nfs4_proc_readlink(inode, page, pgbase, pglen),
2510 				&exception);
2511 	} while (exception.retry);
2512 	return err;
2513 }
2514 
2515 /*
2516  * Got race?
2517  * We will need to arrange for the VFS layer to provide an atomic open.
2518  * Until then, this create/open method is prone to inefficiency and race
2519  * conditions due to the lookup, create, and open VFS calls from sys_open()
2520  * placed on the wire.
2521  *
2522  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2523  * The file will be opened again in the subsequent VFS open call
2524  * (nfs4_proc_file_open).
2525  *
2526  * The open for read will just hang around to be used by any process that
2527  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2528  */
2529 
2530 static int
2531 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2532                  int flags, struct nameidata *nd)
2533 {
2534 	struct path path = {
2535 		.mnt = nd->path.mnt,
2536 		.dentry = dentry,
2537 	};
2538 	struct nfs4_state *state;
2539 	struct rpc_cred *cred;
2540 	fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2541 	int status = 0;
2542 
2543 	cred = rpc_lookup_cred();
2544 	if (IS_ERR(cred)) {
2545 		status = PTR_ERR(cred);
2546 		goto out;
2547 	}
2548 	state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2549 	d_drop(dentry);
2550 	if (IS_ERR(state)) {
2551 		status = PTR_ERR(state);
2552 		goto out_putcred;
2553 	}
2554 	d_add(dentry, igrab(state->inode));
2555 	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2556 	if (flags & O_EXCL) {
2557 		struct nfs_fattr fattr;
2558 		status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2559 		if (status == 0)
2560 			nfs_setattr_update_inode(state->inode, sattr);
2561 		nfs_post_op_update_inode(state->inode, &fattr);
2562 	}
2563 	if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2564 		status = nfs4_intent_set_file(nd, &path, state, fmode);
2565 	else
2566 		nfs4_close_sync(&path, state, fmode);
2567 out_putcred:
2568 	put_rpccred(cred);
2569 out:
2570 	return status;
2571 }
2572 
2573 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2574 {
2575 	struct nfs_server *server = NFS_SERVER(dir);
2576 	struct nfs_removeargs args = {
2577 		.fh = NFS_FH(dir),
2578 		.name.len = name->len,
2579 		.name.name = name->name,
2580 		.bitmask = server->attr_bitmask,
2581 	};
2582 	struct nfs_removeres res = {
2583 		.server = server,
2584 	};
2585 	struct rpc_message msg = {
2586 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2587 		.rpc_argp = &args,
2588 		.rpc_resp = &res,
2589 	};
2590 	int			status;
2591 
2592 	nfs_fattr_init(&res.dir_attr);
2593 	status = nfs4_call_sync(server, &msg, &args, &res, 1);
2594 	if (status == 0) {
2595 		update_changeattr(dir, &res.cinfo);
2596 		nfs_post_op_update_inode(dir, &res.dir_attr);
2597 	}
2598 	return status;
2599 }
2600 
2601 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2602 {
2603 	struct nfs4_exception exception = { };
2604 	int err;
2605 	do {
2606 		err = nfs4_handle_exception(NFS_SERVER(dir),
2607 				_nfs4_proc_remove(dir, name),
2608 				&exception);
2609 	} while (exception.retry);
2610 	return err;
2611 }
2612 
2613 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2614 {
2615 	struct nfs_server *server = NFS_SERVER(dir);
2616 	struct nfs_removeargs *args = msg->rpc_argp;
2617 	struct nfs_removeres *res = msg->rpc_resp;
2618 
2619 	args->bitmask = server->cache_consistency_bitmask;
2620 	res->server = server;
2621 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2622 }
2623 
2624 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2625 {
2626 	struct nfs_removeres *res = task->tk_msg.rpc_resp;
2627 
2628 	nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2629 	if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2630 		return 0;
2631 	update_changeattr(dir, &res->cinfo);
2632 	nfs_post_op_update_inode(dir, &res->dir_attr);
2633 	return 1;
2634 }
2635 
2636 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2637 		struct inode *new_dir, struct qstr *new_name)
2638 {
2639 	struct nfs_server *server = NFS_SERVER(old_dir);
2640 	struct nfs4_rename_arg arg = {
2641 		.old_dir = NFS_FH(old_dir),
2642 		.new_dir = NFS_FH(new_dir),
2643 		.old_name = old_name,
2644 		.new_name = new_name,
2645 		.bitmask = server->attr_bitmask,
2646 	};
2647 	struct nfs_fattr old_fattr, new_fattr;
2648 	struct nfs4_rename_res res = {
2649 		.server = server,
2650 		.old_fattr = &old_fattr,
2651 		.new_fattr = &new_fattr,
2652 	};
2653 	struct rpc_message msg = {
2654 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2655 		.rpc_argp = &arg,
2656 		.rpc_resp = &res,
2657 	};
2658 	int			status;
2659 
2660 	nfs_fattr_init(res.old_fattr);
2661 	nfs_fattr_init(res.new_fattr);
2662 	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2663 
2664 	if (!status) {
2665 		update_changeattr(old_dir, &res.old_cinfo);
2666 		nfs_post_op_update_inode(old_dir, res.old_fattr);
2667 		update_changeattr(new_dir, &res.new_cinfo);
2668 		nfs_post_op_update_inode(new_dir, res.new_fattr);
2669 	}
2670 	return status;
2671 }
2672 
2673 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2674 		struct inode *new_dir, struct qstr *new_name)
2675 {
2676 	struct nfs4_exception exception = { };
2677 	int err;
2678 	do {
2679 		err = nfs4_handle_exception(NFS_SERVER(old_dir),
2680 				_nfs4_proc_rename(old_dir, old_name,
2681 					new_dir, new_name),
2682 				&exception);
2683 	} while (exception.retry);
2684 	return err;
2685 }
2686 
2687 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2688 {
2689 	struct nfs_server *server = NFS_SERVER(inode);
2690 	struct nfs4_link_arg arg = {
2691 		.fh     = NFS_FH(inode),
2692 		.dir_fh = NFS_FH(dir),
2693 		.name   = name,
2694 		.bitmask = server->attr_bitmask,
2695 	};
2696 	struct nfs_fattr fattr, dir_attr;
2697 	struct nfs4_link_res res = {
2698 		.server = server,
2699 		.fattr = &fattr,
2700 		.dir_attr = &dir_attr,
2701 	};
2702 	struct rpc_message msg = {
2703 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2704 		.rpc_argp = &arg,
2705 		.rpc_resp = &res,
2706 	};
2707 	int			status;
2708 
2709 	nfs_fattr_init(res.fattr);
2710 	nfs_fattr_init(res.dir_attr);
2711 	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2712 	if (!status) {
2713 		update_changeattr(dir, &res.cinfo);
2714 		nfs_post_op_update_inode(dir, res.dir_attr);
2715 		nfs_post_op_update_inode(inode, res.fattr);
2716 	}
2717 
2718 	return status;
2719 }
2720 
2721 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2722 {
2723 	struct nfs4_exception exception = { };
2724 	int err;
2725 	do {
2726 		err = nfs4_handle_exception(NFS_SERVER(inode),
2727 				_nfs4_proc_link(inode, dir, name),
2728 				&exception);
2729 	} while (exception.retry);
2730 	return err;
2731 }
2732 
2733 struct nfs4_createdata {
2734 	struct rpc_message msg;
2735 	struct nfs4_create_arg arg;
2736 	struct nfs4_create_res res;
2737 	struct nfs_fh fh;
2738 	struct nfs_fattr fattr;
2739 	struct nfs_fattr dir_fattr;
2740 };
2741 
2742 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2743 		struct qstr *name, struct iattr *sattr, u32 ftype)
2744 {
2745 	struct nfs4_createdata *data;
2746 
2747 	data = kzalloc(sizeof(*data), GFP_KERNEL);
2748 	if (data != NULL) {
2749 		struct nfs_server *server = NFS_SERVER(dir);
2750 
2751 		data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2752 		data->msg.rpc_argp = &data->arg;
2753 		data->msg.rpc_resp = &data->res;
2754 		data->arg.dir_fh = NFS_FH(dir);
2755 		data->arg.server = server;
2756 		data->arg.name = name;
2757 		data->arg.attrs = sattr;
2758 		data->arg.ftype = ftype;
2759 		data->arg.bitmask = server->attr_bitmask;
2760 		data->res.server = server;
2761 		data->res.fh = &data->fh;
2762 		data->res.fattr = &data->fattr;
2763 		data->res.dir_fattr = &data->dir_fattr;
2764 		nfs_fattr_init(data->res.fattr);
2765 		nfs_fattr_init(data->res.dir_fattr);
2766 	}
2767 	return data;
2768 }
2769 
2770 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2771 {
2772 	int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2773 				    &data->arg, &data->res, 1);
2774 	if (status == 0) {
2775 		update_changeattr(dir, &data->res.dir_cinfo);
2776 		nfs_post_op_update_inode(dir, data->res.dir_fattr);
2777 		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2778 	}
2779 	return status;
2780 }
2781 
2782 static void nfs4_free_createdata(struct nfs4_createdata *data)
2783 {
2784 	kfree(data);
2785 }
2786 
2787 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2788 		struct page *page, unsigned int len, struct iattr *sattr)
2789 {
2790 	struct nfs4_createdata *data;
2791 	int status = -ENAMETOOLONG;
2792 
2793 	if (len > NFS4_MAXPATHLEN)
2794 		goto out;
2795 
2796 	status = -ENOMEM;
2797 	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2798 	if (data == NULL)
2799 		goto out;
2800 
2801 	data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2802 	data->arg.u.symlink.pages = &page;
2803 	data->arg.u.symlink.len = len;
2804 
2805 	status = nfs4_do_create(dir, dentry, data);
2806 
2807 	nfs4_free_createdata(data);
2808 out:
2809 	return status;
2810 }
2811 
2812 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2813 		struct page *page, unsigned int len, struct iattr *sattr)
2814 {
2815 	struct nfs4_exception exception = { };
2816 	int err;
2817 	do {
2818 		err = nfs4_handle_exception(NFS_SERVER(dir),
2819 				_nfs4_proc_symlink(dir, dentry, page,
2820 							len, sattr),
2821 				&exception);
2822 	} while (exception.retry);
2823 	return err;
2824 }
2825 
2826 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2827 		struct iattr *sattr)
2828 {
2829 	struct nfs4_createdata *data;
2830 	int status = -ENOMEM;
2831 
2832 	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2833 	if (data == NULL)
2834 		goto out;
2835 
2836 	status = nfs4_do_create(dir, dentry, data);
2837 
2838 	nfs4_free_createdata(data);
2839 out:
2840 	return status;
2841 }
2842 
2843 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2844 		struct iattr *sattr)
2845 {
2846 	struct nfs4_exception exception = { };
2847 	int err;
2848 	do {
2849 		err = nfs4_handle_exception(NFS_SERVER(dir),
2850 				_nfs4_proc_mkdir(dir, dentry, sattr),
2851 				&exception);
2852 	} while (exception.retry);
2853 	return err;
2854 }
2855 
2856 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2857                   u64 cookie, struct page *page, unsigned int count, int plus)
2858 {
2859 	struct inode		*dir = dentry->d_inode;
2860 	struct nfs4_readdir_arg args = {
2861 		.fh = NFS_FH(dir),
2862 		.pages = &page,
2863 		.pgbase = 0,
2864 		.count = count,
2865 		.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2866 	};
2867 	struct nfs4_readdir_res res;
2868 	struct rpc_message msg = {
2869 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2870 		.rpc_argp = &args,
2871 		.rpc_resp = &res,
2872 		.rpc_cred = cred,
2873 	};
2874 	int			status;
2875 
2876 	dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2877 			dentry->d_parent->d_name.name,
2878 			dentry->d_name.name,
2879 			(unsigned long long)cookie);
2880 	nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2881 	res.pgbase = args.pgbase;
2882 	status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2883 	if (status == 0)
2884 		memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2885 
2886 	nfs_invalidate_atime(dir);
2887 
2888 	dprintk("%s: returns %d\n", __func__, status);
2889 	return status;
2890 }
2891 
2892 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2893                   u64 cookie, struct page *page, unsigned int count, int plus)
2894 {
2895 	struct nfs4_exception exception = { };
2896 	int err;
2897 	do {
2898 		err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2899 				_nfs4_proc_readdir(dentry, cred, cookie,
2900 					page, count, plus),
2901 				&exception);
2902 	} while (exception.retry);
2903 	return err;
2904 }
2905 
2906 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2907 		struct iattr *sattr, dev_t rdev)
2908 {
2909 	struct nfs4_createdata *data;
2910 	int mode = sattr->ia_mode;
2911 	int status = -ENOMEM;
2912 
2913 	BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2914 	BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2915 
2916 	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2917 	if (data == NULL)
2918 		goto out;
2919 
2920 	if (S_ISFIFO(mode))
2921 		data->arg.ftype = NF4FIFO;
2922 	else if (S_ISBLK(mode)) {
2923 		data->arg.ftype = NF4BLK;
2924 		data->arg.u.device.specdata1 = MAJOR(rdev);
2925 		data->arg.u.device.specdata2 = MINOR(rdev);
2926 	}
2927 	else if (S_ISCHR(mode)) {
2928 		data->arg.ftype = NF4CHR;
2929 		data->arg.u.device.specdata1 = MAJOR(rdev);
2930 		data->arg.u.device.specdata2 = MINOR(rdev);
2931 	}
2932 
2933 	status = nfs4_do_create(dir, dentry, data);
2934 
2935 	nfs4_free_createdata(data);
2936 out:
2937 	return status;
2938 }
2939 
2940 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2941 		struct iattr *sattr, dev_t rdev)
2942 {
2943 	struct nfs4_exception exception = { };
2944 	int err;
2945 	do {
2946 		err = nfs4_handle_exception(NFS_SERVER(dir),
2947 				_nfs4_proc_mknod(dir, dentry, sattr, rdev),
2948 				&exception);
2949 	} while (exception.retry);
2950 	return err;
2951 }
2952 
2953 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2954 		 struct nfs_fsstat *fsstat)
2955 {
2956 	struct nfs4_statfs_arg args = {
2957 		.fh = fhandle,
2958 		.bitmask = server->attr_bitmask,
2959 	};
2960 	struct nfs4_statfs_res res = {
2961 		.fsstat = fsstat,
2962 	};
2963 	struct rpc_message msg = {
2964 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2965 		.rpc_argp = &args,
2966 		.rpc_resp = &res,
2967 	};
2968 
2969 	nfs_fattr_init(fsstat->fattr);
2970 	return  nfs4_call_sync(server, &msg, &args, &res, 0);
2971 }
2972 
2973 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2974 {
2975 	struct nfs4_exception exception = { };
2976 	int err;
2977 	do {
2978 		err = nfs4_handle_exception(server,
2979 				_nfs4_proc_statfs(server, fhandle, fsstat),
2980 				&exception);
2981 	} while (exception.retry);
2982 	return err;
2983 }
2984 
2985 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2986 		struct nfs_fsinfo *fsinfo)
2987 {
2988 	struct nfs4_fsinfo_arg args = {
2989 		.fh = fhandle,
2990 		.bitmask = server->attr_bitmask,
2991 	};
2992 	struct nfs4_fsinfo_res res = {
2993 		.fsinfo = fsinfo,
2994 	};
2995 	struct rpc_message msg = {
2996 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2997 		.rpc_argp = &args,
2998 		.rpc_resp = &res,
2999 	};
3000 
3001 	return nfs4_call_sync(server, &msg, &args, &res, 0);
3002 }
3003 
3004 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3005 {
3006 	struct nfs4_exception exception = { };
3007 	int err;
3008 
3009 	do {
3010 		err = nfs4_handle_exception(server,
3011 				_nfs4_do_fsinfo(server, fhandle, fsinfo),
3012 				&exception);
3013 	} while (exception.retry);
3014 	return err;
3015 }
3016 
3017 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3018 {
3019 	nfs_fattr_init(fsinfo->fattr);
3020 	return nfs4_do_fsinfo(server, fhandle, fsinfo);
3021 }
3022 
3023 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3024 		struct nfs_pathconf *pathconf)
3025 {
3026 	struct nfs4_pathconf_arg args = {
3027 		.fh = fhandle,
3028 		.bitmask = server->attr_bitmask,
3029 	};
3030 	struct nfs4_pathconf_res res = {
3031 		.pathconf = pathconf,
3032 	};
3033 	struct rpc_message msg = {
3034 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3035 		.rpc_argp = &args,
3036 		.rpc_resp = &res,
3037 	};
3038 
3039 	/* None of the pathconf attributes are mandatory to implement */
3040 	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3041 		memset(pathconf, 0, sizeof(*pathconf));
3042 		return 0;
3043 	}
3044 
3045 	nfs_fattr_init(pathconf->fattr);
3046 	return nfs4_call_sync(server, &msg, &args, &res, 0);
3047 }
3048 
3049 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3050 		struct nfs_pathconf *pathconf)
3051 {
3052 	struct nfs4_exception exception = { };
3053 	int err;
3054 
3055 	do {
3056 		err = nfs4_handle_exception(server,
3057 				_nfs4_proc_pathconf(server, fhandle, pathconf),
3058 				&exception);
3059 	} while (exception.retry);
3060 	return err;
3061 }
3062 
3063 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3064 {
3065 	struct nfs_server *server = NFS_SERVER(data->inode);
3066 
3067 	dprintk("--> %s\n", __func__);
3068 
3069 	nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
3070 
3071 	if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3072 		nfs_restart_rpc(task, server->nfs_client);
3073 		return -EAGAIN;
3074 	}
3075 
3076 	nfs_invalidate_atime(data->inode);
3077 	if (task->tk_status > 0)
3078 		renew_lease(server, data->timestamp);
3079 	return 0;
3080 }
3081 
3082 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3083 {
3084 	data->timestamp   = jiffies;
3085 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3086 }
3087 
3088 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3089 {
3090 	struct inode *inode = data->inode;
3091 
3092 	nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3093 			   task->tk_status);
3094 
3095 	if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3096 		nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3097 		return -EAGAIN;
3098 	}
3099 	if (task->tk_status >= 0) {
3100 		renew_lease(NFS_SERVER(inode), data->timestamp);
3101 		nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3102 	}
3103 	return 0;
3104 }
3105 
3106 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3107 {
3108 	struct nfs_server *server = NFS_SERVER(data->inode);
3109 
3110 	data->args.bitmask = server->cache_consistency_bitmask;
3111 	data->res.server = server;
3112 	data->timestamp   = jiffies;
3113 
3114 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3115 }
3116 
3117 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3118 {
3119 	struct inode *inode = data->inode;
3120 
3121 	nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3122 			   task->tk_status);
3123 	if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3124 		nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3125 		return -EAGAIN;
3126 	}
3127 	nfs_refresh_inode(inode, data->res.fattr);
3128 	return 0;
3129 }
3130 
3131 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3132 {
3133 	struct nfs_server *server = NFS_SERVER(data->inode);
3134 
3135 	data->args.bitmask = server->cache_consistency_bitmask;
3136 	data->res.server = server;
3137 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3138 }
3139 
3140 /*
3141  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3142  * standalone procedure for queueing an asynchronous RENEW.
3143  */
3144 static void nfs4_renew_done(struct rpc_task *task, void *data)
3145 {
3146 	struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3147 	unsigned long timestamp = (unsigned long)data;
3148 
3149 	if (task->tk_status < 0) {
3150 		/* Unless we're shutting down, schedule state recovery! */
3151 		if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3152 			nfs4_schedule_state_recovery(clp);
3153 		return;
3154 	}
3155 	spin_lock(&clp->cl_lock);
3156 	if (time_before(clp->cl_last_renewal,timestamp))
3157 		clp->cl_last_renewal = timestamp;
3158 	spin_unlock(&clp->cl_lock);
3159 }
3160 
3161 static const struct rpc_call_ops nfs4_renew_ops = {
3162 	.rpc_call_done = nfs4_renew_done,
3163 };
3164 
3165 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3166 {
3167 	struct rpc_message msg = {
3168 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3169 		.rpc_argp	= clp,
3170 		.rpc_cred	= cred,
3171 	};
3172 
3173 	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3174 			&nfs4_renew_ops, (void *)jiffies);
3175 }
3176 
3177 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3178 {
3179 	struct rpc_message msg = {
3180 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3181 		.rpc_argp	= clp,
3182 		.rpc_cred	= cred,
3183 	};
3184 	unsigned long now = jiffies;
3185 	int status;
3186 
3187 	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3188 	if (status < 0)
3189 		return status;
3190 	spin_lock(&clp->cl_lock);
3191 	if (time_before(clp->cl_last_renewal,now))
3192 		clp->cl_last_renewal = now;
3193 	spin_unlock(&clp->cl_lock);
3194 	return 0;
3195 }
3196 
3197 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3198 {
3199 	return (server->caps & NFS_CAP_ACLS)
3200 		&& (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3201 		&& (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3202 }
3203 
3204 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3205  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3206  * the stack.
3207  */
3208 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3209 
3210 static void buf_to_pages(const void *buf, size_t buflen,
3211 		struct page **pages, unsigned int *pgbase)
3212 {
3213 	const void *p = buf;
3214 
3215 	*pgbase = offset_in_page(buf);
3216 	p -= *pgbase;
3217 	while (p < buf + buflen) {
3218 		*(pages++) = virt_to_page(p);
3219 		p += PAGE_CACHE_SIZE;
3220 	}
3221 }
3222 
3223 struct nfs4_cached_acl {
3224 	int cached;
3225 	size_t len;
3226 	char data[0];
3227 };
3228 
3229 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3230 {
3231 	struct nfs_inode *nfsi = NFS_I(inode);
3232 
3233 	spin_lock(&inode->i_lock);
3234 	kfree(nfsi->nfs4_acl);
3235 	nfsi->nfs4_acl = acl;
3236 	spin_unlock(&inode->i_lock);
3237 }
3238 
3239 static void nfs4_zap_acl_attr(struct inode *inode)
3240 {
3241 	nfs4_set_cached_acl(inode, NULL);
3242 }
3243 
3244 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3245 {
3246 	struct nfs_inode *nfsi = NFS_I(inode);
3247 	struct nfs4_cached_acl *acl;
3248 	int ret = -ENOENT;
3249 
3250 	spin_lock(&inode->i_lock);
3251 	acl = nfsi->nfs4_acl;
3252 	if (acl == NULL)
3253 		goto out;
3254 	if (buf == NULL) /* user is just asking for length */
3255 		goto out_len;
3256 	if (acl->cached == 0)
3257 		goto out;
3258 	ret = -ERANGE; /* see getxattr(2) man page */
3259 	if (acl->len > buflen)
3260 		goto out;
3261 	memcpy(buf, acl->data, acl->len);
3262 out_len:
3263 	ret = acl->len;
3264 out:
3265 	spin_unlock(&inode->i_lock);
3266 	return ret;
3267 }
3268 
3269 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3270 {
3271 	struct nfs4_cached_acl *acl;
3272 
3273 	if (buf && acl_len <= PAGE_SIZE) {
3274 		acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3275 		if (acl == NULL)
3276 			goto out;
3277 		acl->cached = 1;
3278 		memcpy(acl->data, buf, acl_len);
3279 	} else {
3280 		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3281 		if (acl == NULL)
3282 			goto out;
3283 		acl->cached = 0;
3284 	}
3285 	acl->len = acl_len;
3286 out:
3287 	nfs4_set_cached_acl(inode, acl);
3288 }
3289 
3290 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3291 {
3292 	struct page *pages[NFS4ACL_MAXPAGES];
3293 	struct nfs_getaclargs args = {
3294 		.fh = NFS_FH(inode),
3295 		.acl_pages = pages,
3296 		.acl_len = buflen,
3297 	};
3298 	struct nfs_getaclres res = {
3299 		.acl_len = buflen,
3300 	};
3301 	void *resp_buf;
3302 	struct rpc_message msg = {
3303 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3304 		.rpc_argp = &args,
3305 		.rpc_resp = &res,
3306 	};
3307 	struct page *localpage = NULL;
3308 	int ret;
3309 
3310 	if (buflen < PAGE_SIZE) {
3311 		/* As long as we're doing a round trip to the server anyway,
3312 		 * let's be prepared for a page of acl data. */
3313 		localpage = alloc_page(GFP_KERNEL);
3314 		resp_buf = page_address(localpage);
3315 		if (localpage == NULL)
3316 			return -ENOMEM;
3317 		args.acl_pages[0] = localpage;
3318 		args.acl_pgbase = 0;
3319 		args.acl_len = PAGE_SIZE;
3320 	} else {
3321 		resp_buf = buf;
3322 		buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3323 	}
3324 	ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3325 	if (ret)
3326 		goto out_free;
3327 	if (res.acl_len > args.acl_len)
3328 		nfs4_write_cached_acl(inode, NULL, res.acl_len);
3329 	else
3330 		nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3331 	if (buf) {
3332 		ret = -ERANGE;
3333 		if (res.acl_len > buflen)
3334 			goto out_free;
3335 		if (localpage)
3336 			memcpy(buf, resp_buf, res.acl_len);
3337 	}
3338 	ret = res.acl_len;
3339 out_free:
3340 	if (localpage)
3341 		__free_page(localpage);
3342 	return ret;
3343 }
3344 
3345 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3346 {
3347 	struct nfs4_exception exception = { };
3348 	ssize_t ret;
3349 	do {
3350 		ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3351 		if (ret >= 0)
3352 			break;
3353 		ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3354 	} while (exception.retry);
3355 	return ret;
3356 }
3357 
3358 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3359 {
3360 	struct nfs_server *server = NFS_SERVER(inode);
3361 	int ret;
3362 
3363 	if (!nfs4_server_supports_acls(server))
3364 		return -EOPNOTSUPP;
3365 	ret = nfs_revalidate_inode(server, inode);
3366 	if (ret < 0)
3367 		return ret;
3368 	ret = nfs4_read_cached_acl(inode, buf, buflen);
3369 	if (ret != -ENOENT)
3370 		return ret;
3371 	return nfs4_get_acl_uncached(inode, buf, buflen);
3372 }
3373 
3374 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3375 {
3376 	struct nfs_server *server = NFS_SERVER(inode);
3377 	struct page *pages[NFS4ACL_MAXPAGES];
3378 	struct nfs_setaclargs arg = {
3379 		.fh		= NFS_FH(inode),
3380 		.acl_pages	= pages,
3381 		.acl_len	= buflen,
3382 	};
3383 	struct nfs_setaclres res;
3384 	struct rpc_message msg = {
3385 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3386 		.rpc_argp	= &arg,
3387 		.rpc_resp	= &res,
3388 	};
3389 	int ret;
3390 
3391 	if (!nfs4_server_supports_acls(server))
3392 		return -EOPNOTSUPP;
3393 	nfs_inode_return_delegation(inode);
3394 	buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3395 	ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3396 	nfs_access_zap_cache(inode);
3397 	nfs_zap_acl_cache(inode);
3398 	return ret;
3399 }
3400 
3401 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3402 {
3403 	struct nfs4_exception exception = { };
3404 	int err;
3405 	do {
3406 		err = nfs4_handle_exception(NFS_SERVER(inode),
3407 				__nfs4_proc_set_acl(inode, buf, buflen),
3408 				&exception);
3409 	} while (exception.retry);
3410 	return err;
3411 }
3412 
3413 static int
3414 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3415 {
3416 	if (!clp || task->tk_status >= 0)
3417 		return 0;
3418 	switch(task->tk_status) {
3419 		case -NFS4ERR_ADMIN_REVOKED:
3420 		case -NFS4ERR_BAD_STATEID:
3421 		case -NFS4ERR_OPENMODE:
3422 			if (state == NULL)
3423 				break;
3424 			nfs4_state_mark_reclaim_nograce(clp, state);
3425 		case -NFS4ERR_STALE_CLIENTID:
3426 		case -NFS4ERR_STALE_STATEID:
3427 		case -NFS4ERR_EXPIRED:
3428 			rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3429 			nfs4_schedule_state_recovery(clp);
3430 			if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3431 				rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3432 			task->tk_status = 0;
3433 			return -EAGAIN;
3434 #if defined(CONFIG_NFS_V4_1)
3435 		case -NFS4ERR_BADSESSION:
3436 		case -NFS4ERR_BADSLOT:
3437 		case -NFS4ERR_BAD_HIGH_SLOT:
3438 		case -NFS4ERR_DEADSESSION:
3439 		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3440 		case -NFS4ERR_SEQ_FALSE_RETRY:
3441 		case -NFS4ERR_SEQ_MISORDERED:
3442 			dprintk("%s ERROR %d, Reset session\n", __func__,
3443 				task->tk_status);
3444 			nfs4_schedule_state_recovery(clp);
3445 			task->tk_status = 0;
3446 			return -EAGAIN;
3447 #endif /* CONFIG_NFS_V4_1 */
3448 		case -NFS4ERR_DELAY:
3449 			if (server)
3450 				nfs_inc_server_stats(server, NFSIOS_DELAY);
3451 		case -NFS4ERR_GRACE:
3452 			rpc_delay(task, NFS4_POLL_RETRY_MAX);
3453 			task->tk_status = 0;
3454 			return -EAGAIN;
3455 		case -NFS4ERR_OLD_STATEID:
3456 			task->tk_status = 0;
3457 			return -EAGAIN;
3458 	}
3459 	task->tk_status = nfs4_map_errors(task->tk_status);
3460 	return 0;
3461 }
3462 
3463 static int
3464 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3465 {
3466 	return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3467 }
3468 
3469 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3470 {
3471 	nfs4_verifier sc_verifier;
3472 	struct nfs4_setclientid setclientid = {
3473 		.sc_verifier = &sc_verifier,
3474 		.sc_prog = program,
3475 	};
3476 	struct rpc_message msg = {
3477 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3478 		.rpc_argp = &setclientid,
3479 		.rpc_resp = clp,
3480 		.rpc_cred = cred,
3481 	};
3482 	__be32 *p;
3483 	int loop = 0;
3484 	int status;
3485 
3486 	p = (__be32*)sc_verifier.data;
3487 	*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3488 	*p = htonl((u32)clp->cl_boot_time.tv_nsec);
3489 
3490 	for(;;) {
3491 		setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3492 				sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3493 				clp->cl_ipaddr,
3494 				rpc_peeraddr2str(clp->cl_rpcclient,
3495 							RPC_DISPLAY_ADDR),
3496 				rpc_peeraddr2str(clp->cl_rpcclient,
3497 							RPC_DISPLAY_PROTO),
3498 				clp->cl_rpcclient->cl_auth->au_ops->au_name,
3499 				clp->cl_id_uniquifier);
3500 		setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3501 				sizeof(setclientid.sc_netid),
3502 				rpc_peeraddr2str(clp->cl_rpcclient,
3503 							RPC_DISPLAY_NETID));
3504 		setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3505 				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3506 				clp->cl_ipaddr, port >> 8, port & 255);
3507 
3508 		status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3509 		if (status != -NFS4ERR_CLID_INUSE)
3510 			break;
3511 		if (signalled())
3512 			break;
3513 		if (loop++ & 1)
3514 			ssleep(clp->cl_lease_time + 1);
3515 		else
3516 			if (++clp->cl_id_uniquifier == 0)
3517 				break;
3518 	}
3519 	return status;
3520 }
3521 
3522 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3523 {
3524 	struct nfs_fsinfo fsinfo;
3525 	struct rpc_message msg = {
3526 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3527 		.rpc_argp = clp,
3528 		.rpc_resp = &fsinfo,
3529 		.rpc_cred = cred,
3530 	};
3531 	unsigned long now;
3532 	int status;
3533 
3534 	now = jiffies;
3535 	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3536 	if (status == 0) {
3537 		spin_lock(&clp->cl_lock);
3538 		clp->cl_lease_time = fsinfo.lease_time * HZ;
3539 		clp->cl_last_renewal = now;
3540 		spin_unlock(&clp->cl_lock);
3541 	}
3542 	return status;
3543 }
3544 
3545 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3546 {
3547 	long timeout = 0;
3548 	int err;
3549 	do {
3550 		err = _nfs4_proc_setclientid_confirm(clp, cred);
3551 		switch (err) {
3552 			case 0:
3553 				return err;
3554 			case -NFS4ERR_RESOURCE:
3555 				/* The IBM lawyers misread another document! */
3556 			case -NFS4ERR_DELAY:
3557 				err = nfs4_delay(clp->cl_rpcclient, &timeout);
3558 		}
3559 	} while (err == 0);
3560 	return err;
3561 }
3562 
3563 struct nfs4_delegreturndata {
3564 	struct nfs4_delegreturnargs args;
3565 	struct nfs4_delegreturnres res;
3566 	struct nfs_fh fh;
3567 	nfs4_stateid stateid;
3568 	unsigned long timestamp;
3569 	struct nfs_fattr fattr;
3570 	int rpc_status;
3571 };
3572 
3573 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3574 {
3575 	struct nfs4_delegreturndata *data = calldata;
3576 
3577 	nfs4_sequence_done(data->res.server, &data->res.seq_res,
3578 			task->tk_status);
3579 
3580 	switch (task->tk_status) {
3581 	case -NFS4ERR_STALE_STATEID:
3582 	case -NFS4ERR_EXPIRED:
3583 	case 0:
3584 		renew_lease(data->res.server, data->timestamp);
3585 		break;
3586 	default:
3587 		if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3588 				-EAGAIN) {
3589 			nfs_restart_rpc(task, data->res.server->nfs_client);
3590 			return;
3591 		}
3592 	}
3593 	data->rpc_status = task->tk_status;
3594 }
3595 
3596 static void nfs4_delegreturn_release(void *calldata)
3597 {
3598 	kfree(calldata);
3599 }
3600 
3601 #if defined(CONFIG_NFS_V4_1)
3602 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3603 {
3604 	struct nfs4_delegreturndata *d_data;
3605 
3606 	d_data = (struct nfs4_delegreturndata *)data;
3607 
3608 	if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3609 				&d_data->args.seq_args,
3610 				&d_data->res.seq_res, 1, task))
3611 		return;
3612 	rpc_call_start(task);
3613 }
3614 #endif /* CONFIG_NFS_V4_1 */
3615 
3616 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3617 #if defined(CONFIG_NFS_V4_1)
3618 	.rpc_call_prepare = nfs4_delegreturn_prepare,
3619 #endif /* CONFIG_NFS_V4_1 */
3620 	.rpc_call_done = nfs4_delegreturn_done,
3621 	.rpc_release = nfs4_delegreturn_release,
3622 };
3623 
3624 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3625 {
3626 	struct nfs4_delegreturndata *data;
3627 	struct nfs_server *server = NFS_SERVER(inode);
3628 	struct rpc_task *task;
3629 	struct rpc_message msg = {
3630 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3631 		.rpc_cred = cred,
3632 	};
3633 	struct rpc_task_setup task_setup_data = {
3634 		.rpc_client = server->client,
3635 		.rpc_message = &msg,
3636 		.callback_ops = &nfs4_delegreturn_ops,
3637 		.flags = RPC_TASK_ASYNC,
3638 	};
3639 	int status = 0;
3640 
3641 	data = kzalloc(sizeof(*data), GFP_KERNEL);
3642 	if (data == NULL)
3643 		return -ENOMEM;
3644 	data->args.fhandle = &data->fh;
3645 	data->args.stateid = &data->stateid;
3646 	data->args.bitmask = server->attr_bitmask;
3647 	nfs_copy_fh(&data->fh, NFS_FH(inode));
3648 	memcpy(&data->stateid, stateid, sizeof(data->stateid));
3649 	data->res.fattr = &data->fattr;
3650 	data->res.server = server;
3651 	data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3652 	nfs_fattr_init(data->res.fattr);
3653 	data->timestamp = jiffies;
3654 	data->rpc_status = 0;
3655 
3656 	task_setup_data.callback_data = data;
3657 	msg.rpc_argp = &data->args,
3658 	msg.rpc_resp = &data->res,
3659 	task = rpc_run_task(&task_setup_data);
3660 	if (IS_ERR(task))
3661 		return PTR_ERR(task);
3662 	if (!issync)
3663 		goto out;
3664 	status = nfs4_wait_for_completion_rpc_task(task);
3665 	if (status != 0)
3666 		goto out;
3667 	status = data->rpc_status;
3668 	if (status != 0)
3669 		goto out;
3670 	nfs_refresh_inode(inode, &data->fattr);
3671 out:
3672 	rpc_put_task(task);
3673 	return status;
3674 }
3675 
3676 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3677 {
3678 	struct nfs_server *server = NFS_SERVER(inode);
3679 	struct nfs4_exception exception = { };
3680 	int err;
3681 	do {
3682 		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3683 		switch (err) {
3684 			case -NFS4ERR_STALE_STATEID:
3685 			case -NFS4ERR_EXPIRED:
3686 			case 0:
3687 				return 0;
3688 		}
3689 		err = nfs4_handle_exception(server, err, &exception);
3690 	} while (exception.retry);
3691 	return err;
3692 }
3693 
3694 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3695 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3696 
3697 /*
3698  * sleep, with exponential backoff, and retry the LOCK operation.
3699  */
3700 static unsigned long
3701 nfs4_set_lock_task_retry(unsigned long timeout)
3702 {
3703 	schedule_timeout_killable(timeout);
3704 	timeout <<= 1;
3705 	if (timeout > NFS4_LOCK_MAXTIMEOUT)
3706 		return NFS4_LOCK_MAXTIMEOUT;
3707 	return timeout;
3708 }
3709 
3710 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3711 {
3712 	struct inode *inode = state->inode;
3713 	struct nfs_server *server = NFS_SERVER(inode);
3714 	struct nfs_client *clp = server->nfs_client;
3715 	struct nfs_lockt_args arg = {
3716 		.fh = NFS_FH(inode),
3717 		.fl = request,
3718 	};
3719 	struct nfs_lockt_res res = {
3720 		.denied = request,
3721 	};
3722 	struct rpc_message msg = {
3723 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3724 		.rpc_argp       = &arg,
3725 		.rpc_resp       = &res,
3726 		.rpc_cred	= state->owner->so_cred,
3727 	};
3728 	struct nfs4_lock_state *lsp;
3729 	int status;
3730 
3731 	arg.lock_owner.clientid = clp->cl_clientid;
3732 	status = nfs4_set_lock_state(state, request);
3733 	if (status != 0)
3734 		goto out;
3735 	lsp = request->fl_u.nfs4_fl.owner;
3736 	arg.lock_owner.id = lsp->ls_id.id;
3737 	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3738 	switch (status) {
3739 		case 0:
3740 			request->fl_type = F_UNLCK;
3741 			break;
3742 		case -NFS4ERR_DENIED:
3743 			status = 0;
3744 	}
3745 	request->fl_ops->fl_release_private(request);
3746 out:
3747 	return status;
3748 }
3749 
3750 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3751 {
3752 	struct nfs4_exception exception = { };
3753 	int err;
3754 
3755 	do {
3756 		err = nfs4_handle_exception(NFS_SERVER(state->inode),
3757 				_nfs4_proc_getlk(state, cmd, request),
3758 				&exception);
3759 	} while (exception.retry);
3760 	return err;
3761 }
3762 
3763 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3764 {
3765 	int res = 0;
3766 	switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3767 		case FL_POSIX:
3768 			res = posix_lock_file_wait(file, fl);
3769 			break;
3770 		case FL_FLOCK:
3771 			res = flock_lock_file_wait(file, fl);
3772 			break;
3773 		default:
3774 			BUG();
3775 	}
3776 	return res;
3777 }
3778 
3779 struct nfs4_unlockdata {
3780 	struct nfs_locku_args arg;
3781 	struct nfs_locku_res res;
3782 	struct nfs4_lock_state *lsp;
3783 	struct nfs_open_context *ctx;
3784 	struct file_lock fl;
3785 	const struct nfs_server *server;
3786 	unsigned long timestamp;
3787 };
3788 
3789 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3790 		struct nfs_open_context *ctx,
3791 		struct nfs4_lock_state *lsp,
3792 		struct nfs_seqid *seqid)
3793 {
3794 	struct nfs4_unlockdata *p;
3795 	struct inode *inode = lsp->ls_state->inode;
3796 
3797 	p = kzalloc(sizeof(*p), GFP_KERNEL);
3798 	if (p == NULL)
3799 		return NULL;
3800 	p->arg.fh = NFS_FH(inode);
3801 	p->arg.fl = &p->fl;
3802 	p->arg.seqid = seqid;
3803 	p->res.seqid = seqid;
3804 	p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3805 	p->arg.stateid = &lsp->ls_stateid;
3806 	p->lsp = lsp;
3807 	atomic_inc(&lsp->ls_count);
3808 	/* Ensure we don't close file until we're done freeing locks! */
3809 	p->ctx = get_nfs_open_context(ctx);
3810 	memcpy(&p->fl, fl, sizeof(p->fl));
3811 	p->server = NFS_SERVER(inode);
3812 	return p;
3813 }
3814 
3815 static void nfs4_locku_release_calldata(void *data)
3816 {
3817 	struct nfs4_unlockdata *calldata = data;
3818 	nfs_free_seqid(calldata->arg.seqid);
3819 	nfs4_put_lock_state(calldata->lsp);
3820 	put_nfs_open_context(calldata->ctx);
3821 	kfree(calldata);
3822 }
3823 
3824 static void nfs4_locku_done(struct rpc_task *task, void *data)
3825 {
3826 	struct nfs4_unlockdata *calldata = data;
3827 
3828 	nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3829 			   task->tk_status);
3830 	if (RPC_ASSASSINATED(task))
3831 		return;
3832 	switch (task->tk_status) {
3833 		case 0:
3834 			memcpy(calldata->lsp->ls_stateid.data,
3835 					calldata->res.stateid.data,
3836 					sizeof(calldata->lsp->ls_stateid.data));
3837 			renew_lease(calldata->server, calldata->timestamp);
3838 			break;
3839 		case -NFS4ERR_BAD_STATEID:
3840 		case -NFS4ERR_OLD_STATEID:
3841 		case -NFS4ERR_STALE_STATEID:
3842 		case -NFS4ERR_EXPIRED:
3843 			break;
3844 		default:
3845 			if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3846 				nfs_restart_rpc(task,
3847 						 calldata->server->nfs_client);
3848 	}
3849 }
3850 
3851 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3852 {
3853 	struct nfs4_unlockdata *calldata = data;
3854 
3855 	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3856 		return;
3857 	if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3858 		/* Note: exit _without_ running nfs4_locku_done */
3859 		task->tk_action = NULL;
3860 		return;
3861 	}
3862 	calldata->timestamp = jiffies;
3863 	if (nfs4_setup_sequence(calldata->server->nfs_client,
3864 				&calldata->arg.seq_args,
3865 				&calldata->res.seq_res, 1, task))
3866 		return;
3867 	rpc_call_start(task);
3868 }
3869 
3870 static const struct rpc_call_ops nfs4_locku_ops = {
3871 	.rpc_call_prepare = nfs4_locku_prepare,
3872 	.rpc_call_done = nfs4_locku_done,
3873 	.rpc_release = nfs4_locku_release_calldata,
3874 };
3875 
3876 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3877 		struct nfs_open_context *ctx,
3878 		struct nfs4_lock_state *lsp,
3879 		struct nfs_seqid *seqid)
3880 {
3881 	struct nfs4_unlockdata *data;
3882 	struct rpc_message msg = {
3883 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3884 		.rpc_cred = ctx->cred,
3885 	};
3886 	struct rpc_task_setup task_setup_data = {
3887 		.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3888 		.rpc_message = &msg,
3889 		.callback_ops = &nfs4_locku_ops,
3890 		.workqueue = nfsiod_workqueue,
3891 		.flags = RPC_TASK_ASYNC,
3892 	};
3893 
3894 	/* Ensure this is an unlock - when canceling a lock, the
3895 	 * canceled lock is passed in, and it won't be an unlock.
3896 	 */
3897 	fl->fl_type = F_UNLCK;
3898 
3899 	data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3900 	if (data == NULL) {
3901 		nfs_free_seqid(seqid);
3902 		return ERR_PTR(-ENOMEM);
3903 	}
3904 
3905 	msg.rpc_argp = &data->arg,
3906 	msg.rpc_resp = &data->res,
3907 	task_setup_data.callback_data = data;
3908 	return rpc_run_task(&task_setup_data);
3909 }
3910 
3911 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3912 {
3913 	struct nfs_inode *nfsi = NFS_I(state->inode);
3914 	struct nfs_seqid *seqid;
3915 	struct nfs4_lock_state *lsp;
3916 	struct rpc_task *task;
3917 	int status = 0;
3918 	unsigned char fl_flags = request->fl_flags;
3919 
3920 	status = nfs4_set_lock_state(state, request);
3921 	/* Unlock _before_ we do the RPC call */
3922 	request->fl_flags |= FL_EXISTS;
3923 	down_read(&nfsi->rwsem);
3924 	if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3925 		up_read(&nfsi->rwsem);
3926 		goto out;
3927 	}
3928 	up_read(&nfsi->rwsem);
3929 	if (status != 0)
3930 		goto out;
3931 	/* Is this a delegated lock? */
3932 	if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3933 		goto out;
3934 	lsp = request->fl_u.nfs4_fl.owner;
3935 	seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3936 	status = -ENOMEM;
3937 	if (seqid == NULL)
3938 		goto out;
3939 	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3940 	status = PTR_ERR(task);
3941 	if (IS_ERR(task))
3942 		goto out;
3943 	status = nfs4_wait_for_completion_rpc_task(task);
3944 	rpc_put_task(task);
3945 out:
3946 	request->fl_flags = fl_flags;
3947 	return status;
3948 }
3949 
3950 struct nfs4_lockdata {
3951 	struct nfs_lock_args arg;
3952 	struct nfs_lock_res res;
3953 	struct nfs4_lock_state *lsp;
3954 	struct nfs_open_context *ctx;
3955 	struct file_lock fl;
3956 	unsigned long timestamp;
3957 	int rpc_status;
3958 	int cancelled;
3959 	struct nfs_server *server;
3960 };
3961 
3962 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3963 		struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3964 {
3965 	struct nfs4_lockdata *p;
3966 	struct inode *inode = lsp->ls_state->inode;
3967 	struct nfs_server *server = NFS_SERVER(inode);
3968 
3969 	p = kzalloc(sizeof(*p), GFP_KERNEL);
3970 	if (p == NULL)
3971 		return NULL;
3972 
3973 	p->arg.fh = NFS_FH(inode);
3974 	p->arg.fl = &p->fl;
3975 	p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3976 	if (p->arg.open_seqid == NULL)
3977 		goto out_free;
3978 	p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3979 	if (p->arg.lock_seqid == NULL)
3980 		goto out_free_seqid;
3981 	p->arg.lock_stateid = &lsp->ls_stateid;
3982 	p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3983 	p->arg.lock_owner.id = lsp->ls_id.id;
3984 	p->res.lock_seqid = p->arg.lock_seqid;
3985 	p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3986 	p->lsp = lsp;
3987 	p->server = server;
3988 	atomic_inc(&lsp->ls_count);
3989 	p->ctx = get_nfs_open_context(ctx);
3990 	memcpy(&p->fl, fl, sizeof(p->fl));
3991 	return p;
3992 out_free_seqid:
3993 	nfs_free_seqid(p->arg.open_seqid);
3994 out_free:
3995 	kfree(p);
3996 	return NULL;
3997 }
3998 
3999 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4000 {
4001 	struct nfs4_lockdata *data = calldata;
4002 	struct nfs4_state *state = data->lsp->ls_state;
4003 
4004 	dprintk("%s: begin!\n", __func__);
4005 	if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4006 		return;
4007 	/* Do we need to do an open_to_lock_owner? */
4008 	if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4009 		if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4010 			return;
4011 		data->arg.open_stateid = &state->stateid;
4012 		data->arg.new_lock_owner = 1;
4013 		data->res.open_seqid = data->arg.open_seqid;
4014 	} else
4015 		data->arg.new_lock_owner = 0;
4016 	data->timestamp = jiffies;
4017 	if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
4018 				&data->res.seq_res, 1, task))
4019 		return;
4020 	rpc_call_start(task);
4021 	dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4022 }
4023 
4024 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4025 {
4026 	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4027 	nfs4_lock_prepare(task, calldata);
4028 }
4029 
4030 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4031 {
4032 	struct nfs4_lockdata *data = calldata;
4033 
4034 	dprintk("%s: begin!\n", __func__);
4035 
4036 	nfs4_sequence_done(data->server, &data->res.seq_res,
4037 			task->tk_status);
4038 
4039 	data->rpc_status = task->tk_status;
4040 	if (RPC_ASSASSINATED(task))
4041 		goto out;
4042 	if (data->arg.new_lock_owner != 0) {
4043 		if (data->rpc_status == 0)
4044 			nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4045 		else
4046 			goto out;
4047 	}
4048 	if (data->rpc_status == 0) {
4049 		memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4050 					sizeof(data->lsp->ls_stateid.data));
4051 		data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4052 		renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4053 	}
4054 out:
4055 	dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4056 }
4057 
4058 static void nfs4_lock_release(void *calldata)
4059 {
4060 	struct nfs4_lockdata *data = calldata;
4061 
4062 	dprintk("%s: begin!\n", __func__);
4063 	nfs_free_seqid(data->arg.open_seqid);
4064 	if (data->cancelled != 0) {
4065 		struct rpc_task *task;
4066 		task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4067 				data->arg.lock_seqid);
4068 		if (!IS_ERR(task))
4069 			rpc_put_task(task);
4070 		dprintk("%s: cancelling lock!\n", __func__);
4071 	} else
4072 		nfs_free_seqid(data->arg.lock_seqid);
4073 	nfs4_put_lock_state(data->lsp);
4074 	put_nfs_open_context(data->ctx);
4075 	kfree(data);
4076 	dprintk("%s: done!\n", __func__);
4077 }
4078 
4079 static const struct rpc_call_ops nfs4_lock_ops = {
4080 	.rpc_call_prepare = nfs4_lock_prepare,
4081 	.rpc_call_done = nfs4_lock_done,
4082 	.rpc_release = nfs4_lock_release,
4083 };
4084 
4085 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4086 	.rpc_call_prepare = nfs4_recover_lock_prepare,
4087 	.rpc_call_done = nfs4_lock_done,
4088 	.rpc_release = nfs4_lock_release,
4089 };
4090 
4091 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4092 {
4093 	struct nfs4_lockdata *data;
4094 	struct rpc_task *task;
4095 	struct rpc_message msg = {
4096 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4097 		.rpc_cred = state->owner->so_cred,
4098 	};
4099 	struct rpc_task_setup task_setup_data = {
4100 		.rpc_client = NFS_CLIENT(state->inode),
4101 		.rpc_message = &msg,
4102 		.callback_ops = &nfs4_lock_ops,
4103 		.workqueue = nfsiod_workqueue,
4104 		.flags = RPC_TASK_ASYNC,
4105 	};
4106 	int ret;
4107 
4108 	dprintk("%s: begin!\n", __func__);
4109 	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4110 			fl->fl_u.nfs4_fl.owner);
4111 	if (data == NULL)
4112 		return -ENOMEM;
4113 	if (IS_SETLKW(cmd))
4114 		data->arg.block = 1;
4115 	if (recovery_type > NFS_LOCK_NEW) {
4116 		if (recovery_type == NFS_LOCK_RECLAIM)
4117 			data->arg.reclaim = NFS_LOCK_RECLAIM;
4118 		task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4119 	}
4120 	msg.rpc_argp = &data->arg,
4121 	msg.rpc_resp = &data->res,
4122 	task_setup_data.callback_data = data;
4123 	task = rpc_run_task(&task_setup_data);
4124 	if (IS_ERR(task))
4125 		return PTR_ERR(task);
4126 	ret = nfs4_wait_for_completion_rpc_task(task);
4127 	if (ret == 0) {
4128 		ret = data->rpc_status;
4129 	} else
4130 		data->cancelled = 1;
4131 	rpc_put_task(task);
4132 	dprintk("%s: done, ret = %d!\n", __func__, ret);
4133 	return ret;
4134 }
4135 
4136 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4137 {
4138 	struct nfs_server *server = NFS_SERVER(state->inode);
4139 	struct nfs4_exception exception = { };
4140 	int err;
4141 
4142 	do {
4143 		/* Cache the lock if possible... */
4144 		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4145 			return 0;
4146 		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4147 		if (err != -NFS4ERR_DELAY)
4148 			break;
4149 		nfs4_handle_exception(server, err, &exception);
4150 	} while (exception.retry);
4151 	return err;
4152 }
4153 
4154 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4155 {
4156 	struct nfs_server *server = NFS_SERVER(state->inode);
4157 	struct nfs4_exception exception = { };
4158 	int err;
4159 
4160 	err = nfs4_set_lock_state(state, request);
4161 	if (err != 0)
4162 		return err;
4163 	do {
4164 		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4165 			return 0;
4166 		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4167 		switch (err) {
4168 		default:
4169 			goto out;
4170 		case -NFS4ERR_GRACE:
4171 		case -NFS4ERR_DELAY:
4172 			nfs4_handle_exception(server, err, &exception);
4173 			err = 0;
4174 		}
4175 	} while (exception.retry);
4176 out:
4177 	return err;
4178 }
4179 
4180 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4181 {
4182 	struct nfs_inode *nfsi = NFS_I(state->inode);
4183 	unsigned char fl_flags = request->fl_flags;
4184 	int status;
4185 
4186 	/* Is this a delegated open? */
4187 	status = nfs4_set_lock_state(state, request);
4188 	if (status != 0)
4189 		goto out;
4190 	request->fl_flags |= FL_ACCESS;
4191 	status = do_vfs_lock(request->fl_file, request);
4192 	if (status < 0)
4193 		goto out;
4194 	down_read(&nfsi->rwsem);
4195 	if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4196 		/* Yes: cache locks! */
4197 		/* ...but avoid races with delegation recall... */
4198 		request->fl_flags = fl_flags & ~FL_SLEEP;
4199 		status = do_vfs_lock(request->fl_file, request);
4200 		goto out_unlock;
4201 	}
4202 	status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4203 	if (status != 0)
4204 		goto out_unlock;
4205 	/* Note: we always want to sleep here! */
4206 	request->fl_flags = fl_flags | FL_SLEEP;
4207 	if (do_vfs_lock(request->fl_file, request) < 0)
4208 		printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4209 out_unlock:
4210 	up_read(&nfsi->rwsem);
4211 out:
4212 	request->fl_flags = fl_flags;
4213 	return status;
4214 }
4215 
4216 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4217 {
4218 	struct nfs4_exception exception = { };
4219 	int err;
4220 
4221 	do {
4222 		err = _nfs4_proc_setlk(state, cmd, request);
4223 		if (err == -NFS4ERR_DENIED)
4224 			err = -EAGAIN;
4225 		err = nfs4_handle_exception(NFS_SERVER(state->inode),
4226 				err, &exception);
4227 	} while (exception.retry);
4228 	return err;
4229 }
4230 
4231 static int
4232 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4233 {
4234 	struct nfs_open_context *ctx;
4235 	struct nfs4_state *state;
4236 	unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4237 	int status;
4238 
4239 	/* verify open state */
4240 	ctx = nfs_file_open_context(filp);
4241 	state = ctx->state;
4242 
4243 	if (request->fl_start < 0 || request->fl_end < 0)
4244 		return -EINVAL;
4245 
4246 	if (IS_GETLK(cmd)) {
4247 		if (state != NULL)
4248 			return nfs4_proc_getlk(state, F_GETLK, request);
4249 		return 0;
4250 	}
4251 
4252 	if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4253 		return -EINVAL;
4254 
4255 	if (request->fl_type == F_UNLCK) {
4256 		if (state != NULL)
4257 			return nfs4_proc_unlck(state, cmd, request);
4258 		return 0;
4259 	}
4260 
4261 	if (state == NULL)
4262 		return -ENOLCK;
4263 	do {
4264 		status = nfs4_proc_setlk(state, cmd, request);
4265 		if ((status != -EAGAIN) || IS_SETLK(cmd))
4266 			break;
4267 		timeout = nfs4_set_lock_task_retry(timeout);
4268 		status = -ERESTARTSYS;
4269 		if (signalled())
4270 			break;
4271 	} while(status < 0);
4272 	return status;
4273 }
4274 
4275 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4276 {
4277 	struct nfs_server *server = NFS_SERVER(state->inode);
4278 	struct nfs4_exception exception = { };
4279 	int err;
4280 
4281 	err = nfs4_set_lock_state(state, fl);
4282 	if (err != 0)
4283 		goto out;
4284 	do {
4285 		err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4286 		switch (err) {
4287 			default:
4288 				printk(KERN_ERR "%s: unhandled error %d.\n",
4289 						__func__, err);
4290 			case 0:
4291 			case -ESTALE:
4292 				goto out;
4293 			case -NFS4ERR_EXPIRED:
4294 			case -NFS4ERR_STALE_CLIENTID:
4295 			case -NFS4ERR_STALE_STATEID:
4296 			case -NFS4ERR_BADSESSION:
4297 			case -NFS4ERR_BADSLOT:
4298 			case -NFS4ERR_BAD_HIGH_SLOT:
4299 			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4300 			case -NFS4ERR_DEADSESSION:
4301 				nfs4_schedule_state_recovery(server->nfs_client);
4302 				goto out;
4303 			case -ERESTARTSYS:
4304 				/*
4305 				 * The show must go on: exit, but mark the
4306 				 * stateid as needing recovery.
4307 				 */
4308 			case -NFS4ERR_ADMIN_REVOKED:
4309 			case -NFS4ERR_BAD_STATEID:
4310 			case -NFS4ERR_OPENMODE:
4311 				nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4312 				err = 0;
4313 				goto out;
4314 			case -ENOMEM:
4315 			case -NFS4ERR_DENIED:
4316 				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
4317 				err = 0;
4318 				goto out;
4319 			case -NFS4ERR_DELAY:
4320 				break;
4321 		}
4322 		err = nfs4_handle_exception(server, err, &exception);
4323 	} while (exception.retry);
4324 out:
4325 	return err;
4326 }
4327 
4328 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4329 
4330 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4331 		size_t buflen, int flags)
4332 {
4333 	struct inode *inode = dentry->d_inode;
4334 
4335 	if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4336 		return -EOPNOTSUPP;
4337 
4338 	return nfs4_proc_set_acl(inode, buf, buflen);
4339 }
4340 
4341 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4342  * and that's what we'll do for e.g. user attributes that haven't been set.
4343  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4344  * attributes in kernel-managed attribute namespaces. */
4345 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4346 		size_t buflen)
4347 {
4348 	struct inode *inode = dentry->d_inode;
4349 
4350 	if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4351 		return -EOPNOTSUPP;
4352 
4353 	return nfs4_proc_get_acl(inode, buf, buflen);
4354 }
4355 
4356 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4357 {
4358 	size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4359 
4360 	if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4361 		return 0;
4362 	if (buf && buflen < len)
4363 		return -ERANGE;
4364 	if (buf)
4365 		memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4366 	return len;
4367 }
4368 
4369 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4370 {
4371 	if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4372 		(fattr->valid & NFS_ATTR_FATTR_FSID) &&
4373 		(fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4374 		return;
4375 
4376 	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4377 		NFS_ATTR_FATTR_NLINK;
4378 	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4379 	fattr->nlink = 2;
4380 }
4381 
4382 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4383 		struct nfs4_fs_locations *fs_locations, struct page *page)
4384 {
4385 	struct nfs_server *server = NFS_SERVER(dir);
4386 	u32 bitmask[2] = {
4387 		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4388 		[1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4389 	};
4390 	struct nfs4_fs_locations_arg args = {
4391 		.dir_fh = NFS_FH(dir),
4392 		.name = name,
4393 		.page = page,
4394 		.bitmask = bitmask,
4395 	};
4396 	struct nfs4_fs_locations_res res = {
4397 		.fs_locations = fs_locations,
4398 	};
4399 	struct rpc_message msg = {
4400 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4401 		.rpc_argp = &args,
4402 		.rpc_resp = &res,
4403 	};
4404 	int status;
4405 
4406 	dprintk("%s: start\n", __func__);
4407 	nfs_fattr_init(&fs_locations->fattr);
4408 	fs_locations->server = server;
4409 	fs_locations->nlocations = 0;
4410 	status = nfs4_call_sync(server, &msg, &args, &res, 0);
4411 	nfs_fixup_referral_attributes(&fs_locations->fattr);
4412 	dprintk("%s: returned status = %d\n", __func__, status);
4413 	return status;
4414 }
4415 
4416 #ifdef CONFIG_NFS_V4_1
4417 /*
4418  * nfs4_proc_exchange_id()
4419  *
4420  * Since the clientid has expired, all compounds using sessions
4421  * associated with the stale clientid will be returning
4422  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4423  * be in some phase of session reset.
4424  */
4425 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4426 {
4427 	nfs4_verifier verifier;
4428 	struct nfs41_exchange_id_args args = {
4429 		.client = clp,
4430 		.flags = clp->cl_exchange_flags,
4431 	};
4432 	struct nfs41_exchange_id_res res = {
4433 		.client = clp,
4434 	};
4435 	int status;
4436 	struct rpc_message msg = {
4437 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4438 		.rpc_argp = &args,
4439 		.rpc_resp = &res,
4440 		.rpc_cred = cred,
4441 	};
4442 	__be32 *p;
4443 
4444 	dprintk("--> %s\n", __func__);
4445 	BUG_ON(clp == NULL);
4446 
4447 	/* Remove server-only flags */
4448 	args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4449 
4450 	p = (u32 *)verifier.data;
4451 	*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4452 	*p = htonl((u32)clp->cl_boot_time.tv_nsec);
4453 	args.verifier = &verifier;
4454 
4455 	while (1) {
4456 		args.id_len = scnprintf(args.id, sizeof(args.id),
4457 					"%s/%s %u",
4458 					clp->cl_ipaddr,
4459 					rpc_peeraddr2str(clp->cl_rpcclient,
4460 							 RPC_DISPLAY_ADDR),
4461 					clp->cl_id_uniquifier);
4462 
4463 		status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4464 
4465 		if (status != NFS4ERR_CLID_INUSE)
4466 			break;
4467 
4468 		if (signalled())
4469 			break;
4470 
4471 		if (++clp->cl_id_uniquifier == 0)
4472 			break;
4473 	}
4474 
4475 	dprintk("<-- %s status= %d\n", __func__, status);
4476 	return status;
4477 }
4478 
4479 struct nfs4_get_lease_time_data {
4480 	struct nfs4_get_lease_time_args *args;
4481 	struct nfs4_get_lease_time_res *res;
4482 	struct nfs_client *clp;
4483 };
4484 
4485 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4486 					void *calldata)
4487 {
4488 	int ret;
4489 	struct nfs4_get_lease_time_data *data =
4490 			(struct nfs4_get_lease_time_data *)calldata;
4491 
4492 	dprintk("--> %s\n", __func__);
4493 	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4494 	/* just setup sequence, do not trigger session recovery
4495 	   since we're invoked within one */
4496 	ret = nfs41_setup_sequence(data->clp->cl_session,
4497 				   &data->args->la_seq_args,
4498 				   &data->res->lr_seq_res, 0, task);
4499 
4500 	BUG_ON(ret == -EAGAIN);
4501 	rpc_call_start(task);
4502 	dprintk("<-- %s\n", __func__);
4503 }
4504 
4505 /*
4506  * Called from nfs4_state_manager thread for session setup, so don't recover
4507  * from sequence operation or clientid errors.
4508  */
4509 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4510 {
4511 	struct nfs4_get_lease_time_data *data =
4512 			(struct nfs4_get_lease_time_data *)calldata;
4513 
4514 	dprintk("--> %s\n", __func__);
4515 	nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4516 	switch (task->tk_status) {
4517 	case -NFS4ERR_DELAY:
4518 	case -NFS4ERR_GRACE:
4519 		dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4520 		rpc_delay(task, NFS4_POLL_RETRY_MIN);
4521 		task->tk_status = 0;
4522 		nfs_restart_rpc(task, data->clp);
4523 		return;
4524 	}
4525 	dprintk("<-- %s\n", __func__);
4526 }
4527 
4528 struct rpc_call_ops nfs4_get_lease_time_ops = {
4529 	.rpc_call_prepare = nfs4_get_lease_time_prepare,
4530 	.rpc_call_done = nfs4_get_lease_time_done,
4531 };
4532 
4533 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4534 {
4535 	struct rpc_task *task;
4536 	struct nfs4_get_lease_time_args args;
4537 	struct nfs4_get_lease_time_res res = {
4538 		.lr_fsinfo = fsinfo,
4539 	};
4540 	struct nfs4_get_lease_time_data data = {
4541 		.args = &args,
4542 		.res = &res,
4543 		.clp = clp,
4544 	};
4545 	struct rpc_message msg = {
4546 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4547 		.rpc_argp = &args,
4548 		.rpc_resp = &res,
4549 	};
4550 	struct rpc_task_setup task_setup = {
4551 		.rpc_client = clp->cl_rpcclient,
4552 		.rpc_message = &msg,
4553 		.callback_ops = &nfs4_get_lease_time_ops,
4554 		.callback_data = &data
4555 	};
4556 	int status;
4557 
4558 	res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4559 	dprintk("--> %s\n", __func__);
4560 	task = rpc_run_task(&task_setup);
4561 
4562 	if (IS_ERR(task))
4563 		status = PTR_ERR(task);
4564 	else {
4565 		status = task->tk_status;
4566 		rpc_put_task(task);
4567 	}
4568 	dprintk("<-- %s return %d\n", __func__, status);
4569 
4570 	return status;
4571 }
4572 
4573 /*
4574  * Reset a slot table
4575  */
4576 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4577 		int old_max_slots, int ivalue)
4578 {
4579 	int i;
4580 	int ret = 0;
4581 
4582 	dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4583 
4584 	/*
4585 	 * Until we have dynamic slot table adjustment, insist
4586 	 * upon the same slot table size
4587 	 */
4588 	if (max_slots != old_max_slots) {
4589 		dprintk("%s reset slot table does't match old\n",
4590 			__func__);
4591 		ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4592 		goto out;
4593 	}
4594 	spin_lock(&tbl->slot_tbl_lock);
4595 	for (i = 0; i < max_slots; ++i)
4596 		tbl->slots[i].seq_nr = ivalue;
4597 	spin_unlock(&tbl->slot_tbl_lock);
4598 	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4599 		tbl, tbl->slots, tbl->max_slots);
4600 out:
4601 	dprintk("<-- %s: return %d\n", __func__, ret);
4602 	return ret;
4603 }
4604 
4605 /*
4606  * Reset the forechannel and backchannel slot tables
4607  */
4608 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4609 {
4610 	int status;
4611 
4612 	status = nfs4_reset_slot_table(&session->fc_slot_table,
4613 			session->fc_attrs.max_reqs,
4614 			session->fc_slot_table.max_slots,
4615 			1);
4616 	if (status)
4617 		return status;
4618 
4619 	status = nfs4_reset_slot_table(&session->bc_slot_table,
4620 			session->bc_attrs.max_reqs,
4621 			session->bc_slot_table.max_slots,
4622 			0);
4623 	return status;
4624 }
4625 
4626 /* Destroy the slot table */
4627 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4628 {
4629 	if (session->fc_slot_table.slots != NULL) {
4630 		kfree(session->fc_slot_table.slots);
4631 		session->fc_slot_table.slots = NULL;
4632 	}
4633 	if (session->bc_slot_table.slots != NULL) {
4634 		kfree(session->bc_slot_table.slots);
4635 		session->bc_slot_table.slots = NULL;
4636 	}
4637 	return;
4638 }
4639 
4640 /*
4641  * Initialize slot table
4642  */
4643 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4644 		int max_slots, int ivalue)
4645 {
4646 	struct nfs4_slot *slot;
4647 	int ret = -ENOMEM;
4648 
4649 	BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4650 
4651 	dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4652 
4653 	slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4654 	if (!slot)
4655 		goto out;
4656 	ret = 0;
4657 
4658 	spin_lock(&tbl->slot_tbl_lock);
4659 	tbl->max_slots = max_slots;
4660 	tbl->slots = slot;
4661 	tbl->highest_used_slotid = -1;  /* no slot is currently used */
4662 	spin_unlock(&tbl->slot_tbl_lock);
4663 	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4664 		tbl, tbl->slots, tbl->max_slots);
4665 out:
4666 	dprintk("<-- %s: return %d\n", __func__, ret);
4667 	return ret;
4668 }
4669 
4670 /*
4671  * Initialize the forechannel and backchannel tables
4672  */
4673 static int nfs4_init_slot_tables(struct nfs4_session *session)
4674 {
4675 	struct nfs4_slot_table *tbl;
4676 	int status = 0;
4677 
4678 	tbl = &session->fc_slot_table;
4679 	if (tbl->slots == NULL) {
4680 		status = nfs4_init_slot_table(tbl,
4681 				session->fc_attrs.max_reqs, 1);
4682 		if (status)
4683 			return status;
4684 	}
4685 
4686 	tbl = &session->bc_slot_table;
4687 	if (tbl->slots == NULL) {
4688 		status = nfs4_init_slot_table(tbl,
4689 				session->bc_attrs.max_reqs, 0);
4690 		if (status)
4691 			nfs4_destroy_slot_tables(session);
4692 	}
4693 
4694 	return status;
4695 }
4696 
4697 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4698 {
4699 	struct nfs4_session *session;
4700 	struct nfs4_slot_table *tbl;
4701 
4702 	session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4703 	if (!session)
4704 		return NULL;
4705 
4706 	/*
4707 	 * The create session reply races with the server back
4708 	 * channel probe. Mark the client NFS_CS_SESSION_INITING
4709 	 * so that the client back channel can find the
4710 	 * nfs_client struct
4711 	 */
4712 	clp->cl_cons_state = NFS_CS_SESSION_INITING;
4713 	init_completion(&session->complete);
4714 
4715 	tbl = &session->fc_slot_table;
4716 	tbl->highest_used_slotid = -1;
4717 	spin_lock_init(&tbl->slot_tbl_lock);
4718 	rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4719 
4720 	tbl = &session->bc_slot_table;
4721 	tbl->highest_used_slotid = -1;
4722 	spin_lock_init(&tbl->slot_tbl_lock);
4723 	rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4724 
4725 	session->clp = clp;
4726 	return session;
4727 }
4728 
4729 void nfs4_destroy_session(struct nfs4_session *session)
4730 {
4731 	nfs4_proc_destroy_session(session);
4732 	dprintk("%s Destroy backchannel for xprt %p\n",
4733 		__func__, session->clp->cl_rpcclient->cl_xprt);
4734 	xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4735 				NFS41_BC_MIN_CALLBACKS);
4736 	nfs4_destroy_slot_tables(session);
4737 	kfree(session);
4738 }
4739 
4740 /*
4741  * Initialize the values to be used by the client in CREATE_SESSION
4742  * If nfs4_init_session set the fore channel request and response sizes,
4743  * use them.
4744  *
4745  * Set the back channel max_resp_sz_cached to zero to force the client to
4746  * always set csa_cachethis to FALSE because the current implementation
4747  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4748  */
4749 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4750 {
4751 	struct nfs4_session *session = args->client->cl_session;
4752 	unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4753 		     mxresp_sz = session->fc_attrs.max_resp_sz;
4754 
4755 	if (mxrqst_sz == 0)
4756 		mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4757 	if (mxresp_sz == 0)
4758 		mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4759 	/* Fore channel attributes */
4760 	args->fc_attrs.headerpadsz = 0;
4761 	args->fc_attrs.max_rqst_sz = mxrqst_sz;
4762 	args->fc_attrs.max_resp_sz = mxresp_sz;
4763 	args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4764 	args->fc_attrs.max_ops = NFS4_MAX_OPS;
4765 	args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4766 
4767 	dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4768 		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4769 		__func__,
4770 		args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4771 		args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4772 		args->fc_attrs.max_reqs);
4773 
4774 	/* Back channel attributes */
4775 	args->bc_attrs.headerpadsz = 0;
4776 	args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4777 	args->bc_attrs.max_resp_sz = PAGE_SIZE;
4778 	args->bc_attrs.max_resp_sz_cached = 0;
4779 	args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4780 	args->bc_attrs.max_reqs = 1;
4781 
4782 	dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4783 		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4784 		__func__,
4785 		args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4786 		args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4787 		args->bc_attrs.max_reqs);
4788 }
4789 
4790 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4791 {
4792 	if (rcvd <= sent)
4793 		return 0;
4794 	printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4795 		"sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4796 	return -EINVAL;
4797 }
4798 
4799 #define _verify_fore_channel_attr(_name_) \
4800 	_verify_channel_attr("fore", #_name_, \
4801 			     args->fc_attrs._name_, \
4802 			     session->fc_attrs._name_)
4803 
4804 #define _verify_back_channel_attr(_name_) \
4805 	_verify_channel_attr("back", #_name_, \
4806 			     args->bc_attrs._name_, \
4807 			     session->bc_attrs._name_)
4808 
4809 /*
4810  * The server is not allowed to increase the fore channel header pad size,
4811  * maximum response size, or maximum number of operations.
4812  *
4813  * The back channel attributes are only negotiatied down: We send what the
4814  * (back channel) server insists upon.
4815  */
4816 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4817 				     struct nfs4_session *session)
4818 {
4819 	int ret = 0;
4820 
4821 	ret |= _verify_fore_channel_attr(headerpadsz);
4822 	ret |= _verify_fore_channel_attr(max_resp_sz);
4823 	ret |= _verify_fore_channel_attr(max_ops);
4824 
4825 	ret |= _verify_back_channel_attr(headerpadsz);
4826 	ret |= _verify_back_channel_attr(max_rqst_sz);
4827 	ret |= _verify_back_channel_attr(max_resp_sz);
4828 	ret |= _verify_back_channel_attr(max_resp_sz_cached);
4829 	ret |= _verify_back_channel_attr(max_ops);
4830 	ret |= _verify_back_channel_attr(max_reqs);
4831 
4832 	return ret;
4833 }
4834 
4835 static int _nfs4_proc_create_session(struct nfs_client *clp)
4836 {
4837 	struct nfs4_session *session = clp->cl_session;
4838 	struct nfs41_create_session_args args = {
4839 		.client = clp,
4840 		.cb_program = NFS4_CALLBACK,
4841 	};
4842 	struct nfs41_create_session_res res = {
4843 		.client = clp,
4844 	};
4845 	struct rpc_message msg = {
4846 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4847 		.rpc_argp = &args,
4848 		.rpc_resp = &res,
4849 	};
4850 	int status;
4851 
4852 	nfs4_init_channel_attrs(&args);
4853 	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4854 
4855 	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4856 
4857 	if (!status)
4858 		/* Verify the session's negotiated channel_attrs values */
4859 		status = nfs4_verify_channel_attrs(&args, session);
4860 	if (!status) {
4861 		/* Increment the clientid slot sequence id */
4862 		clp->cl_seqid++;
4863 	}
4864 
4865 	return status;
4866 }
4867 
4868 /*
4869  * Issues a CREATE_SESSION operation to the server.
4870  * It is the responsibility of the caller to verify the session is
4871  * expired before calling this routine.
4872  */
4873 int nfs4_proc_create_session(struct nfs_client *clp)
4874 {
4875 	int status;
4876 	unsigned *ptr;
4877 	struct nfs4_session *session = clp->cl_session;
4878 
4879 	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4880 
4881 	status = _nfs4_proc_create_session(clp);
4882 	if (status)
4883 		goto out;
4884 
4885 	/* Init and reset the fore channel */
4886 	status = nfs4_init_slot_tables(session);
4887 	dprintk("slot table initialization returned %d\n", status);
4888 	if (status)
4889 		goto out;
4890 	status = nfs4_reset_slot_tables(session);
4891 	dprintk("slot table reset returned %d\n", status);
4892 	if (status)
4893 		goto out;
4894 
4895 	ptr = (unsigned *)&session->sess_id.data[0];
4896 	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4897 		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4898 out:
4899 	dprintk("<-- %s\n", __func__);
4900 	return status;
4901 }
4902 
4903 /*
4904  * Issue the over-the-wire RPC DESTROY_SESSION.
4905  * The caller must serialize access to this routine.
4906  */
4907 int nfs4_proc_destroy_session(struct nfs4_session *session)
4908 {
4909 	int status = 0;
4910 	struct rpc_message msg;
4911 
4912 	dprintk("--> nfs4_proc_destroy_session\n");
4913 
4914 	/* session is still being setup */
4915 	if (session->clp->cl_cons_state != NFS_CS_READY)
4916 		return status;
4917 
4918 	msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4919 	msg.rpc_argp = session;
4920 	msg.rpc_resp = NULL;
4921 	msg.rpc_cred = NULL;
4922 	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4923 
4924 	if (status)
4925 		printk(KERN_WARNING
4926 			"Got error %d from the server on DESTROY_SESSION. "
4927 			"Session has been destroyed regardless...\n", status);
4928 
4929 	dprintk("<-- nfs4_proc_destroy_session\n");
4930 	return status;
4931 }
4932 
4933 int nfs4_init_session(struct nfs_server *server)
4934 {
4935 	struct nfs_client *clp = server->nfs_client;
4936 	struct nfs4_session *session;
4937 	unsigned int rsize, wsize;
4938 	int ret;
4939 
4940 	if (!nfs4_has_session(clp))
4941 		return 0;
4942 
4943 	rsize = server->rsize;
4944 	if (rsize == 0)
4945 		rsize = NFS_MAX_FILE_IO_SIZE;
4946 	wsize = server->wsize;
4947 	if (wsize == 0)
4948 		wsize = NFS_MAX_FILE_IO_SIZE;
4949 
4950 	session = clp->cl_session;
4951 	session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
4952 	session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
4953 
4954 	ret = nfs4_recover_expired_lease(server);
4955 	if (!ret)
4956 		ret = nfs4_check_client_ready(clp);
4957 	return ret;
4958 }
4959 
4960 /*
4961  * Renew the cl_session lease.
4962  */
4963 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4964 {
4965 	struct nfs4_sequence_args args;
4966 	struct nfs4_sequence_res res;
4967 
4968 	struct rpc_message msg = {
4969 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4970 		.rpc_argp = &args,
4971 		.rpc_resp = &res,
4972 		.rpc_cred = cred,
4973 	};
4974 
4975 	args.sa_cache_this = 0;
4976 
4977 	return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4978 				       &res, args.sa_cache_this, 1);
4979 }
4980 
4981 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4982 {
4983 	struct nfs_client *clp = (struct nfs_client *)data;
4984 
4985 	nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4986 
4987 	if (task->tk_status < 0) {
4988 		dprintk("%s ERROR %d\n", __func__, task->tk_status);
4989 
4990 		if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4991 								== -EAGAIN) {
4992 			nfs_restart_rpc(task, clp);
4993 			return;
4994 		}
4995 	}
4996 	dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4997 
4998 	kfree(task->tk_msg.rpc_argp);
4999 	kfree(task->tk_msg.rpc_resp);
5000 
5001 	dprintk("<-- %s\n", __func__);
5002 }
5003 
5004 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5005 {
5006 	struct nfs_client *clp;
5007 	struct nfs4_sequence_args *args;
5008 	struct nfs4_sequence_res *res;
5009 
5010 	clp = (struct nfs_client *)data;
5011 	args = task->tk_msg.rpc_argp;
5012 	res = task->tk_msg.rpc_resp;
5013 
5014 	if (nfs4_setup_sequence(clp, args, res, 0, task))
5015 		return;
5016 	rpc_call_start(task);
5017 }
5018 
5019 static const struct rpc_call_ops nfs41_sequence_ops = {
5020 	.rpc_call_done = nfs41_sequence_call_done,
5021 	.rpc_call_prepare = nfs41_sequence_prepare,
5022 };
5023 
5024 static int nfs41_proc_async_sequence(struct nfs_client *clp,
5025 				     struct rpc_cred *cred)
5026 {
5027 	struct nfs4_sequence_args *args;
5028 	struct nfs4_sequence_res *res;
5029 	struct rpc_message msg = {
5030 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5031 		.rpc_cred = cred,
5032 	};
5033 
5034 	args = kzalloc(sizeof(*args), GFP_KERNEL);
5035 	if (!args)
5036 		return -ENOMEM;
5037 	res = kzalloc(sizeof(*res), GFP_KERNEL);
5038 	if (!res) {
5039 		kfree(args);
5040 		return -ENOMEM;
5041 	}
5042 	res->sr_slotid = NFS4_MAX_SLOT_TABLE;
5043 	msg.rpc_argp = args;
5044 	msg.rpc_resp = res;
5045 
5046 	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
5047 			      &nfs41_sequence_ops, (void *)clp);
5048 }
5049 
5050 struct nfs4_reclaim_complete_data {
5051 	struct nfs_client *clp;
5052 	struct nfs41_reclaim_complete_args arg;
5053 	struct nfs41_reclaim_complete_res res;
5054 };
5055 
5056 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5057 {
5058 	struct nfs4_reclaim_complete_data *calldata = data;
5059 
5060 	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5061 	if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
5062 				&calldata->res.seq_res, 0, task))
5063 		return;
5064 
5065 	rpc_call_start(task);
5066 }
5067 
5068 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5069 {
5070 	struct nfs4_reclaim_complete_data *calldata = data;
5071 	struct nfs_client *clp = calldata->clp;
5072 	struct nfs4_sequence_res *res = &calldata->res.seq_res;
5073 
5074 	dprintk("--> %s\n", __func__);
5075 	nfs41_sequence_done(clp, res, task->tk_status);
5076 	switch (task->tk_status) {
5077 	case 0:
5078 	case -NFS4ERR_COMPLETE_ALREADY:
5079 		break;
5080 	case -NFS4ERR_BADSESSION:
5081 	case -NFS4ERR_DEADSESSION:
5082 		/*
5083 		 * Handle the session error, but do not retry the operation, as
5084 		 * we have no way of telling whether the clientid had to be
5085 		 * reset before we got our reply.  If reset, a new wave of
5086 		 * reclaim operations will follow, containing their own reclaim
5087 		 * complete.  We don't want our retry to get on the way of
5088 		 * recovery by incorrectly indicating to the server that we're
5089 		 * done reclaiming state since the process had to be restarted.
5090 		 */
5091 		_nfs4_async_handle_error(task, NULL, clp, NULL);
5092 		break;
5093 	default:
5094 		if (_nfs4_async_handle_error(
5095 				task, NULL, clp, NULL) == -EAGAIN) {
5096 			rpc_restart_call_prepare(task);
5097 			return;
5098 		}
5099 	}
5100 
5101 	dprintk("<-- %s\n", __func__);
5102 }
5103 
5104 static void nfs4_free_reclaim_complete_data(void *data)
5105 {
5106 	struct nfs4_reclaim_complete_data *calldata = data;
5107 
5108 	kfree(calldata);
5109 }
5110 
5111 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5112 	.rpc_call_prepare = nfs4_reclaim_complete_prepare,
5113 	.rpc_call_done = nfs4_reclaim_complete_done,
5114 	.rpc_release = nfs4_free_reclaim_complete_data,
5115 };
5116 
5117 /*
5118  * Issue a global reclaim complete.
5119  */
5120 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5121 {
5122 	struct nfs4_reclaim_complete_data *calldata;
5123 	struct rpc_task *task;
5124 	struct rpc_message msg = {
5125 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5126 	};
5127 	struct rpc_task_setup task_setup_data = {
5128 		.rpc_client = clp->cl_rpcclient,
5129 		.rpc_message = &msg,
5130 		.callback_ops = &nfs4_reclaim_complete_call_ops,
5131 		.flags = RPC_TASK_ASYNC,
5132 	};
5133 	int status = -ENOMEM;
5134 
5135 	dprintk("--> %s\n", __func__);
5136 	calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
5137 	if (calldata == NULL)
5138 		goto out;
5139 	calldata->clp = clp;
5140 	calldata->arg.one_fs = 0;
5141 	calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5142 
5143 	msg.rpc_argp = &calldata->arg;
5144 	msg.rpc_resp = &calldata->res;
5145 	task_setup_data.callback_data = calldata;
5146 	task = rpc_run_task(&task_setup_data);
5147 	if (IS_ERR(task))
5148 		status = PTR_ERR(task);
5149 	rpc_put_task(task);
5150 out:
5151 	dprintk("<-- %s status=%d\n", __func__, status);
5152 	return status;
5153 }
5154 #endif /* CONFIG_NFS_V4_1 */
5155 
5156 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5157 	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5158 	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
5159 	.recover_open	= nfs4_open_reclaim,
5160 	.recover_lock	= nfs4_lock_reclaim,
5161 	.establish_clid = nfs4_init_clientid,
5162 	.get_clid_cred	= nfs4_get_setclientid_cred,
5163 };
5164 
5165 #if defined(CONFIG_NFS_V4_1)
5166 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5167 	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5168 	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
5169 	.recover_open	= nfs4_open_reclaim,
5170 	.recover_lock	= nfs4_lock_reclaim,
5171 	.establish_clid = nfs41_init_clientid,
5172 	.get_clid_cred	= nfs4_get_exchange_id_cred,
5173 	.reclaim_complete = nfs41_proc_reclaim_complete,
5174 };
5175 #endif /* CONFIG_NFS_V4_1 */
5176 
5177 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5178 	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5179 	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
5180 	.recover_open	= nfs4_open_expired,
5181 	.recover_lock	= nfs4_lock_expired,
5182 	.establish_clid = nfs4_init_clientid,
5183 	.get_clid_cred	= nfs4_get_setclientid_cred,
5184 };
5185 
5186 #if defined(CONFIG_NFS_V4_1)
5187 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5188 	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5189 	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
5190 	.recover_open	= nfs4_open_expired,
5191 	.recover_lock	= nfs4_lock_expired,
5192 	.establish_clid = nfs41_init_clientid,
5193 	.get_clid_cred	= nfs4_get_exchange_id_cred,
5194 };
5195 #endif /* CONFIG_NFS_V4_1 */
5196 
5197 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5198 	.sched_state_renewal = nfs4_proc_async_renew,
5199 	.get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5200 	.renew_lease = nfs4_proc_renew,
5201 };
5202 
5203 #if defined(CONFIG_NFS_V4_1)
5204 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5205 	.sched_state_renewal = nfs41_proc_async_sequence,
5206 	.get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5207 	.renew_lease = nfs4_proc_sequence,
5208 };
5209 #endif
5210 
5211 /*
5212  * Per minor version reboot and network partition recovery ops
5213  */
5214 
5215 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5216 	&nfs40_reboot_recovery_ops,
5217 #if defined(CONFIG_NFS_V4_1)
5218 	&nfs41_reboot_recovery_ops,
5219 #endif
5220 };
5221 
5222 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5223 	&nfs40_nograce_recovery_ops,
5224 #if defined(CONFIG_NFS_V4_1)
5225 	&nfs41_nograce_recovery_ops,
5226 #endif
5227 };
5228 
5229 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5230 	&nfs40_state_renewal_ops,
5231 #if defined(CONFIG_NFS_V4_1)
5232 	&nfs41_state_renewal_ops,
5233 #endif
5234 };
5235 
5236 static const struct inode_operations nfs4_file_inode_operations = {
5237 	.permission	= nfs_permission,
5238 	.getattr	= nfs_getattr,
5239 	.setattr	= nfs_setattr,
5240 	.getxattr	= nfs4_getxattr,
5241 	.setxattr	= nfs4_setxattr,
5242 	.listxattr	= nfs4_listxattr,
5243 };
5244 
5245 const struct nfs_rpc_ops nfs_v4_clientops = {
5246 	.version	= 4,			/* protocol version */
5247 	.dentry_ops	= &nfs4_dentry_operations,
5248 	.dir_inode_ops	= &nfs4_dir_inode_operations,
5249 	.file_inode_ops	= &nfs4_file_inode_operations,
5250 	.getroot	= nfs4_proc_get_root,
5251 	.getattr	= nfs4_proc_getattr,
5252 	.setattr	= nfs4_proc_setattr,
5253 	.lookupfh	= nfs4_proc_lookupfh,
5254 	.lookup		= nfs4_proc_lookup,
5255 	.access		= nfs4_proc_access,
5256 	.readlink	= nfs4_proc_readlink,
5257 	.create		= nfs4_proc_create,
5258 	.remove		= nfs4_proc_remove,
5259 	.unlink_setup	= nfs4_proc_unlink_setup,
5260 	.unlink_done	= nfs4_proc_unlink_done,
5261 	.rename		= nfs4_proc_rename,
5262 	.link		= nfs4_proc_link,
5263 	.symlink	= nfs4_proc_symlink,
5264 	.mkdir		= nfs4_proc_mkdir,
5265 	.rmdir		= nfs4_proc_remove,
5266 	.readdir	= nfs4_proc_readdir,
5267 	.mknod		= nfs4_proc_mknod,
5268 	.statfs		= nfs4_proc_statfs,
5269 	.fsinfo		= nfs4_proc_fsinfo,
5270 	.pathconf	= nfs4_proc_pathconf,
5271 	.set_capabilities = nfs4_server_capabilities,
5272 	.decode_dirent	= nfs4_decode_dirent,
5273 	.read_setup	= nfs4_proc_read_setup,
5274 	.read_done	= nfs4_read_done,
5275 	.write_setup	= nfs4_proc_write_setup,
5276 	.write_done	= nfs4_write_done,
5277 	.commit_setup	= nfs4_proc_commit_setup,
5278 	.commit_done	= nfs4_commit_done,
5279 	.lock		= nfs4_proc_lock,
5280 	.clear_acl_cache = nfs4_zap_acl_attr,
5281 	.close_context  = nfs4_close_context,
5282 };
5283 
5284 /*
5285  * Local variables:
5286  *  c-basic-offset: 8
5287  * End:
5288  */
5289