nfs4proc.c 151.4 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
/*
 *  fs/nfs/nfs4proc.c
 *
 *  Client-side procedure declarations for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/string.h>
42
#include <linux/slab.h>
L
Linus Torvalds 已提交
43 44 45 46 47 48
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/namei.h>
49
#include <linux/mount.h>
B
Benny Halevy 已提交
50
#include <linux/module.h>
51
#include <linux/sunrpc/bc_xprt.h>
52
#include <linux/xattr.h>
53
#include <linux/utsname.h>
L
Linus Torvalds 已提交
54

55
#include "nfs4_fs.h"
L
Linus Torvalds 已提交
56
#include "delegation.h"
57
#include "internal.h"
58
#include "iostat.h"
A
Andy Adamson 已提交
59
#include "callback.h"
60
#include "pnfs.h"
L
Linus Torvalds 已提交
61 62 63

#define NFSDBG_FACILITY		NFSDBG_PROC

64
#define NFS4_POLL_RETRY_MIN	(HZ/10)
L
Linus Torvalds 已提交
65 66
#define NFS4_POLL_RETRY_MAX	(15*HZ)

67 68
#define NFS4_MAX_LOOP_ON_RECOVER (10)

69
struct nfs4_opendata;
70
static int _nfs4_proc_open(struct nfs4_opendata *data);
71
static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
L
Linus Torvalds 已提交
72
static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
73
static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
74 75
static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
76 77 78
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs4_state *state);
L
Linus Torvalds 已提交
79 80

/* Prevent leaks of NFSv4 errors into userland */
81
static int nfs4_map_errors(int err)
L
Linus Torvalds 已提交
82
{
83 84 85 86 87 88
	if (err >= -1000)
		return err;
	switch (err) {
	case -NFS4ERR_RESOURCE:
		return -EREMOTEIO;
	default:
L
Linus Torvalds 已提交
89
		dprintk("%s could not handle NFSv4 error %d\n",
90
				__func__, -err);
91
		break;
L
Linus Torvalds 已提交
92
	}
93
	return -EIO;
L
Linus Torvalds 已提交
94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
}

/*
 * This is our standard bitmap for GETATTR requests.
 */
const u32 nfs4_fattr_bitmap[2] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
};

const u32 nfs4_statfs_bitmap[2] = {
	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};

125
const u32 nfs4_pathconf_bitmap[2] = {
L
Linus Torvalds 已提交
126 127 128 129 130 131 132 133 134
	FATTR4_WORD0_MAXLINK
	| FATTR4_WORD0_MAXNAME,
	0
};

const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
			| FATTR4_WORD0_MAXREAD
			| FATTR4_WORD0_MAXWRITE
			| FATTR4_WORD0_LEASE_TIME,
135
			FATTR4_WORD1_TIME_DELTA
136
			| FATTR4_WORD1_FS_LAYOUT_TYPES
L
Linus Torvalds 已提交
137 138
};

139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
const u32 nfs4_fs_locations_bitmap[2] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID
	| FATTR4_WORD0_FS_LOCATIONS,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID
};

A
Al Viro 已提交
158
static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
L
Linus Torvalds 已提交
159 160
		struct nfs4_readdir_arg *readdir)
{
161
	__be32 *start, *p;
L
Linus Torvalds 已提交
162 163 164

	BUG_ON(readdir->count < 80);
	if (cookie > 2) {
165
		readdir->cookie = cookie;
L
Linus Torvalds 已提交
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181
		memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
		return;
	}

	readdir->cookie = 0;
	memset(&readdir->verifier, 0, sizeof(readdir->verifier));
	if (cookie == 2)
		return;
	
	/*
	 * NFSv4 servers do not return entries for '.' and '..'
	 * Therefore, we fake these entries here.  We let '.'
	 * have cookie 0 and '..' have cookie 1.  Note that
	 * when talking to the server, we always send cookie 0
	 * instead of 1 or 2.
	 */
182
	start = p = kmap_atomic(*readdir->pages, KM_USER0);
L
Linus Torvalds 已提交
183 184 185 186 187 188 189 190 191 192 193
	
	if (cookie == 0) {
		*p++ = xdr_one;                                  /* next */
		*p++ = xdr_zero;                   /* cookie, first word */
		*p++ = xdr_one;                   /* cookie, second word */
		*p++ = xdr_one;                             /* entry len */
		memcpy(p, ".\0\0\0", 4);                        /* entry */
		p++;
		*p++ = xdr_one;                         /* bitmap length */
		*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
		*p++ = htonl(8);              /* attribute buffer length */
P
Peter Staubach 已提交
194
		p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
L
Linus Torvalds 已提交
195 196 197 198 199 200 201 202 203 204 205
	}
	
	*p++ = xdr_one;                                  /* next */
	*p++ = xdr_zero;                   /* cookie, first word */
	*p++ = xdr_two;                   /* cookie, second word */
	*p++ = xdr_two;                             /* entry len */
	memcpy(p, "..\0\0", 4);                         /* entry */
	p++;
	*p++ = xdr_one;                         /* bitmap length */
	*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
	*p++ = htonl(8);              /* attribute buffer length */
P
Peter Staubach 已提交
206
	p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
L
Linus Torvalds 已提交
207 208 209 210 211 212

	readdir->pgbase = (char *)p - (char *)start;
	readdir->count -= readdir->pgbase;
	kunmap_atomic(start, KM_USER0);
}

213 214 215 216 217 218
static int nfs4_wait_clnt_recover(struct nfs_client *clp)
{
	int res;

	might_sleep();

219
	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
220
			nfs_wait_bit_killable, TASK_KILLABLE);
221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
	return res;
}

static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
{
	int res = 0;

	might_sleep();

	if (*timeout <= 0)
		*timeout = NFS4_POLL_RETRY_MIN;
	if (*timeout > NFS4_POLL_RETRY_MAX)
		*timeout = NFS4_POLL_RETRY_MAX;
	schedule_timeout_killable(*timeout);
	if (fatal_signal_pending(current))
		res = -ERESTARTSYS;
	*timeout <<= 1;
	return res;
}

/* This is the error handling routine for processes that are allowed
 * to sleep.
 */
static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
{
	struct nfs_client *clp = server->nfs_client;
247
	struct nfs4_state *state = exception->state;
248 249 250 251 252 253
	int ret = errorcode;

	exception->retry = 0;
	switch(errorcode) {
		case 0:
			return 0;
254 255 256 257 258
		case -NFS4ERR_ADMIN_REVOKED:
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_OPENMODE:
			if (state == NULL)
				break;
259 260
			nfs4_schedule_stateid_recovery(server, state);
			goto wait_on_recovery;
261
		case -NFS4ERR_STALE_STATEID:
262
		case -NFS4ERR_STALE_CLIENTID:
263
		case -NFS4ERR_EXPIRED:
264 265
			nfs4_schedule_lease_recovery(clp);
			goto wait_on_recovery;
266
#if defined(CONFIG_NFS_V4_1)
267 268 269 270 271 272 273 274 275
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
			dprintk("%s ERROR: %d Reset session\n", __func__,
				errorcode);
276
			nfs4_schedule_session_recovery(clp->cl_session);
277
			exception->retry = 1;
278
			break;
279
#endif /* defined(CONFIG_NFS_V4_1) */
280
		case -NFS4ERR_FILE_OPEN:
281 282 283 284 285 286 287
			if (exception->timeout > HZ) {
				/* We have retried a decent amount, time to
				 * fail
				 */
				ret = -EBUSY;
				break;
			}
288 289
		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
290
		case -EKEYEXPIRED:
291 292 293 294 295 296 297 298
			ret = nfs4_delay(server->client, &exception->timeout);
			if (ret != 0)
				break;
		case -NFS4ERR_OLD_STATEID:
			exception->retry = 1;
	}
	/* We failed to handle the error */
	return nfs4_map_errors(ret);
299
wait_on_recovery:
300 301 302 303
	ret = nfs4_wait_clnt_recover(clp);
	if (ret == 0)
		exception->retry = 1;
	return ret;
304 305 306
}


307
static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
L
Linus Torvalds 已提交
308 309 310 311 312 313 314
{
	spin_lock(&clp->cl_lock);
	if (time_before(clp->cl_last_renewal,timestamp))
		clp->cl_last_renewal = timestamp;
	spin_unlock(&clp->cl_lock);
}

315 316 317 318 319
static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
{
	do_renew_lease(server->nfs_client, timestamp);
}

A
Andy Adamson 已提交
320 321
#if defined(CONFIG_NFS_V4_1)

A
Andy Adamson 已提交
322 323 324 325 326 327 328 329 330 331 332 333
/*
 * nfs4_free_slot - free a slot and efficiently update slot table.
 *
 * freeing a slot is trivially done by clearing its respective bit
 * in the bitmap.
 * If the freed slotid equals highest_used_slotid we want to update it
 * so that the server would be able to size down the slot table if needed,
 * otherwise we know that the highest_used_slotid is still in use.
 * When updating highest_used_slotid there may be "holes" in the bitmap
 * so we need to scan down from highest_used_slotid to 0 looking for the now
 * highest slotid in use.
 * If none found, highest_used_slotid is set to -1.
334 335
 *
 * Must be called while holding tbl->slot_tbl_lock
A
Andy Adamson 已提交
336 337
 */
static void
338
nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
A
Andy Adamson 已提交
339
{
340
	int free_slotid = free_slot - tbl->slots;
A
Andy Adamson 已提交
341 342
	int slotid = free_slotid;

343
	BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
A
Andy Adamson 已提交
344 345 346 347 348 349
	/* clear used bit in bitmap */
	__clear_bit(slotid, tbl->used_slots);

	/* update highest_used_slotid when it is freed */
	if (slotid == tbl->highest_used_slotid) {
		slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
T
Trond Myklebust 已提交
350
		if (slotid < tbl->max_slots)
A
Andy Adamson 已提交
351 352 353 354 355 356 357 358
			tbl->highest_used_slotid = slotid;
		else
			tbl->highest_used_slotid = -1;
	}
	dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
		free_slotid, tbl->highest_used_slotid);
}

359
/*
360
 * Signal state manager thread if session fore channel is drained
361
 */
362
static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
363
{
364 365
	struct rpc_task *task;

366
	if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
367 368 369
		task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
		if (task)
			rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
370 371 372 373 374 375
		return;
	}

	if (ses->fc_slot_table.highest_used_slotid != -1)
		return;

376 377 378 379 380 381 382 383 384 385 386 387 388 389
	dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
	complete(&ses->fc_slot_table.complete);
}

/*
 * Signal state manager thread if session back channel is drained
 */
void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
{
	if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
	    ses->bc_slot_table.highest_used_slotid != -1)
		return;
	dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
	complete(&ses->bc_slot_table.complete);
390 391
}

392
static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
A
Andy Adamson 已提交
393 394 395
{
	struct nfs4_slot_table *tbl;

396
	tbl = &res->sr_session->fc_slot_table;
397
	if (!res->sr_slot) {
A
Andy Adamson 已提交
398 399
		/* just wake up the next guy waiting since
		 * we may have not consumed a slot after all */
A
Andy Adamson 已提交
400
		dprintk("%s: No slot\n", __func__);
401
		return;
A
Andy Adamson 已提交
402
	}
403

404
	spin_lock(&tbl->slot_tbl_lock);
405
	nfs4_free_slot(tbl, res->sr_slot);
406
	nfs4_check_drain_fc_complete(res->sr_session);
407
	spin_unlock(&tbl->slot_tbl_lock);
408
	res->sr_slot = NULL;
A
Andy Adamson 已提交
409 410
}

411
static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
A
Andy Adamson 已提交
412 413
{
	unsigned long timestamp;
414
	struct nfs_client *clp;
A
Andy Adamson 已提交
415 416 417 418 419 420 421 422 423 424 425

	/*
	 * sr_status remains 1 if an RPC level error occurred. The server
	 * may or may not have processed the sequence operation..
	 * Proceed as if the server received and processed the sequence
	 * operation.
	 */
	if (res->sr_status == 1)
		res->sr_status = NFS_OK;

	/* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
426
	if (!res->sr_slot)
A
Andy Adamson 已提交
427 428
		goto out;

A
Andy Adamson 已提交
429
	/* Check the SEQUENCE operation status */
430 431
	switch (res->sr_status) {
	case 0:
A
Andy Adamson 已提交
432
		/* Update the slot's sequence and clientid lease timer */
433
		++res->sr_slot->seq_nr;
A
Andy Adamson 已提交
434
		timestamp = res->sr_renewal_time;
435
		clp = res->sr_session->clp;
436
		do_renew_lease(clp, timestamp);
437
		/* Check sequence flags */
438 439
		if (res->sr_status_flags != 0)
			nfs4_schedule_lease_recovery(clp);
440 441 442 443 444 445
		break;
	case -NFS4ERR_DELAY:
		/* The server detected a resend of the RPC call and
		 * returned NFS4ERR_DELAY as per Section 2.10.6.2
		 * of RFC5661.
		 */
446
		dprintk("%s: slot=%td seq=%d: Operation in progress\n",
447 448 449
			__func__,
			res->sr_slot - res->sr_session->fc_slot_table.slots,
			res->sr_slot->seq_nr);
450 451 452
		goto out_retry;
	default:
		/* Just update the slot sequence no. */
453
		++res->sr_slot->seq_nr;
A
Andy Adamson 已提交
454 455 456 457
	}
out:
	/* The session may be reset by one of the error handlers. */
	dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
458
	nfs41_sequence_free_slot(res);
459 460
	return 1;
out_retry:
461
	if (!rpc_restart_call(task))
462 463 464
		goto out;
	rpc_delay(task, NFS4_POLL_RETRY_MAX);
	return 0;
A
Andy Adamson 已提交
465 466
}

467 468
static int nfs4_sequence_done(struct rpc_task *task,
			       struct nfs4_sequence_res *res)
469
{
470 471 472
	if (res->sr_session == NULL)
		return 1;
	return nfs41_sequence_done(task, res);
473 474
}

B
Benny Halevy 已提交
475 476 477 478 479 480 481
/*
 * nfs4_find_slot - efficiently look for a free slot
 *
 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 * If found, we mark the slot as used, update the highest_used_slotid,
 * and respectively set up the sequence operation args.
 * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
A
Andy Adamson 已提交
482 483
 *
 * Note: must be called with under the slot_tbl_lock.
B
Benny Halevy 已提交
484 485
 */
static u8
486
nfs4_find_slot(struct nfs4_slot_table *tbl)
B
Benny Halevy 已提交
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507
{
	int slotid;
	u8 ret_id = NFS4_MAX_SLOT_TABLE;
	BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);

	dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
		__func__, tbl->used_slots[0], tbl->highest_used_slotid,
		tbl->max_slots);
	slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
	if (slotid >= tbl->max_slots)
		goto out;
	__set_bit(slotid, tbl->used_slots);
	if (slotid > tbl->highest_used_slotid)
		tbl->highest_used_slotid = slotid;
	ret_id = slotid;
out:
	dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
		__func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
	return ret_id;
}

A
Andy Adamson 已提交
508
int nfs41_setup_sequence(struct nfs4_session *session,
A
Andy Adamson 已提交
509 510 511 512 513
				struct nfs4_sequence_args *args,
				struct nfs4_sequence_res *res,
				int cache_reply,
				struct rpc_task *task)
{
A
Andy Adamson 已提交
514 515 516 517 518
	struct nfs4_slot *slot;
	struct nfs4_slot_table *tbl;
	u8 slotid;

	dprintk("--> %s\n", __func__);
A
Andy Adamson 已提交
519
	/* slot already allocated? */
520
	if (res->sr_slot != NULL)
A
Andy Adamson 已提交
521 522
		return 0;

A
Andy Adamson 已提交
523 524 525
	tbl = &session->fc_slot_table;

	spin_lock(&tbl->slot_tbl_lock);
526
	if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
527
	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
528 529 530 531
		/*
		 * The state manager will wait until the slot table is empty.
		 * Schedule the reset thread
		 */
A
Andy Adamson 已提交
532
		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
533
		spin_unlock(&tbl->slot_tbl_lock);
T
Trond Myklebust 已提交
534
		dprintk("%s Schedule Session Reset\n", __func__);
A
Andy Adamson 已提交
535
		return -EAGAIN;
536 537
	}

538 539 540 541 542 543 544 545
	if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
		spin_unlock(&tbl->slot_tbl_lock);
		dprintk("%s enforce FIFO order\n", __func__);
		return -EAGAIN;
	}

546
	slotid = nfs4_find_slot(tbl);
A
Andy Adamson 已提交
547 548 549 550 551 552 553 554
	if (slotid == NFS4_MAX_SLOT_TABLE) {
		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
		spin_unlock(&tbl->slot_tbl_lock);
		dprintk("<-- %s: no free slots\n", __func__);
		return -EAGAIN;
	}
	spin_unlock(&tbl->slot_tbl_lock);

555
	rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
A
Andy Adamson 已提交
556
	slot = tbl->slots + slotid;
B
Benny Halevy 已提交
557
	args->sa_session = session;
A
Andy Adamson 已提交
558 559 560 561 562
	args->sa_slotid = slotid;
	args->sa_cache_this = cache_reply;

	dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);

B
Benny Halevy 已提交
563
	res->sr_session = session;
564
	res->sr_slot = slot;
A
Andy Adamson 已提交
565
	res->sr_renewal_time = jiffies;
566
	res->sr_status_flags = 0;
A
Andy Adamson 已提交
567 568 569 570 571
	/*
	 * sr_status is only set in decode_sequence, and so will remain
	 * set to 1 if an rpc level failure occurs.
	 */
	res->sr_status = 1;
A
Andy Adamson 已提交
572 573
	return 0;
}
A
Andy Adamson 已提交
574
EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
A
Andy Adamson 已提交
575

576
int nfs4_setup_sequence(const struct nfs_server *server,
A
Andy Adamson 已提交
577 578 579 580 581
			struct nfs4_sequence_args *args,
			struct nfs4_sequence_res *res,
			int cache_reply,
			struct rpc_task *task)
{
582
	struct nfs4_session *session = nfs4_get_session(server);
A
Andy Adamson 已提交
583 584
	int ret = 0;

585 586 587 588 589 590
	if (session == NULL) {
		args->sa_session = NULL;
		res->sr_session = NULL;
		goto out;
	}

591
	dprintk("--> %s clp %p session %p sr_slot %td\n",
592 593
		__func__, session->clp, session, res->sr_slot ?
			res->sr_slot - session->fc_slot_table.slots : -1);
A
Andy Adamson 已提交
594

595
	ret = nfs41_setup_sequence(session, args, res, cache_reply,
A
Andy Adamson 已提交
596 597 598 599 600 601 602
				   task);
out:
	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
}

struct nfs41_call_sync_data {
603
	const struct nfs_server *seq_server;
A
Andy Adamson 已提交
604 605 606 607 608 609 610 611 612
	struct nfs4_sequence_args *seq_args;
	struct nfs4_sequence_res *seq_res;
	int cache_reply;
};

static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs41_call_sync_data *data = calldata;

613 614 615
	dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);

	if (nfs4_setup_sequence(data->seq_server, data->seq_args,
A
Andy Adamson 已提交
616 617 618 619 620
				data->seq_res, data->cache_reply, task))
		return;
	rpc_call_start(task);
}

621 622 623 624 625 626
static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
{
	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
	nfs41_call_sync_prepare(task, calldata);
}

A
Andy Adamson 已提交
627 628 629 630
static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
{
	struct nfs41_call_sync_data *data = calldata;

631
	nfs41_sequence_done(task, data->seq_res);
A
Andy Adamson 已提交
632 633
}

A
Andy Adamson 已提交
634 635
struct rpc_call_ops nfs41_call_sync_ops = {
	.rpc_call_prepare = nfs41_call_sync_prepare,
A
Andy Adamson 已提交
636
	.rpc_call_done = nfs41_call_sync_done,
A
Andy Adamson 已提交
637 638
};

639 640 641 642 643
struct rpc_call_ops nfs41_call_priv_sync_ops = {
	.rpc_call_prepare = nfs41_call_priv_sync_prepare,
	.rpc_call_done = nfs41_call_sync_done,
};

644
static int nfs4_call_sync_sequence(struct nfs_server *server,
A
Andy Adamson 已提交
645 646 647
				   struct rpc_message *msg,
				   struct nfs4_sequence_args *args,
				   struct nfs4_sequence_res *res,
648 649
				   int cache_reply,
				   int privileged)
A
Andy Adamson 已提交
650 651 652 653
{
	int ret;
	struct rpc_task *task;
	struct nfs41_call_sync_data data = {
654
		.seq_server = server,
A
Andy Adamson 已提交
655 656 657 658 659
		.seq_args = args,
		.seq_res = res,
		.cache_reply = cache_reply,
	};
	struct rpc_task_setup task_setup = {
660
		.rpc_client = server->client,
A
Andy Adamson 已提交
661 662 663 664 665
		.rpc_message = msg,
		.callback_ops = &nfs41_call_sync_ops,
		.callback_data = &data
	};

666
	res->sr_slot = NULL;
667 668
	if (privileged)
		task_setup.callback_ops = &nfs41_call_priv_sync_ops;
A
Andy Adamson 已提交
669 670 671 672 673 674 675 676 677 678
	task = rpc_run_task(&task_setup);
	if (IS_ERR(task))
		ret = PTR_ERR(task);
	else {
		ret = task->tk_status;
		rpc_put_task(task);
	}
	return ret;
}

A
Andy Adamson 已提交
679 680 681 682 683 684
int _nfs4_call_sync_session(struct nfs_server *server,
			    struct rpc_message *msg,
			    struct nfs4_sequence_args *args,
			    struct nfs4_sequence_res *res,
			    int cache_reply)
{
685
	return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
A
Andy Adamson 已提交
686 687
}

688
#else
689 690
static int nfs4_sequence_done(struct rpc_task *task,
			       struct nfs4_sequence_res *res)
691
{
692
	return 1;
693
}
A
Andy Adamson 已提交
694 695 696 697 698 699 700 701
#endif /* CONFIG_NFS_V4_1 */

int _nfs4_call_sync(struct nfs_server *server,
		    struct rpc_message *msg,
		    struct nfs4_sequence_args *args,
		    struct nfs4_sequence_res *res,
		    int cache_reply)
{
702
	args->sa_session = res->sr_session = NULL;
A
Andy Adamson 已提交
703 704 705 706
	return rpc_call_sync(server->client, msg, 0);
}

#define nfs4_call_sync(server, msg, args, res, cache_reply) \
707
	(server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
A
Andy Adamson 已提交
708 709
			&(res)->seq_res, (cache_reply))

710
static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
L
Linus Torvalds 已提交
711
{
712
	struct nfs_inode *nfsi = NFS_I(dir);
L
Linus Torvalds 已提交
713

714
	spin_lock(&dir->i_lock);
715 716
	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
	if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
717
		nfs_force_lookup_revalidate(dir);
718
	nfsi->change_attr = cinfo->after;
719
	spin_unlock(&dir->i_lock);
L
Linus Torvalds 已提交
720 721
}

722
struct nfs4_opendata {
723
	struct kref kref;
724 725
	struct nfs_openargs o_arg;
	struct nfs_openres o_res;
726 727
	struct nfs_open_confirmargs c_arg;
	struct nfs_open_confirmres c_res;
728 729
	struct nfs_fattr f_attr;
	struct nfs_fattr dir_attr;
730
	struct path path;
731 732
	struct dentry *dir;
	struct nfs4_state_owner *owner;
733
	struct nfs4_state *state;
734
	struct iattr attrs;
735
	unsigned long timestamp;
736
	unsigned int rpc_done : 1;
737 738
	int rpc_status;
	int cancelled;
739 740
};

741 742 743 744 745

static void nfs4_init_opendata_res(struct nfs4_opendata *p)
{
	p->o_res.f_attr = &p->f_attr;
	p->o_res.dir_attr = &p->dir_attr;
746 747
	p->o_res.seqid = p->o_arg.seqid;
	p->c_res.seqid = p->c_arg.seqid;
748 749 750 751 752
	p->o_res.server = p->o_arg.server;
	nfs_fattr_init(&p->f_attr);
	nfs_fattr_init(&p->dir_attr);
}

753
static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
754
		struct nfs4_state_owner *sp, fmode_t fmode, int flags,
755 756
		const struct iattr *attrs,
		gfp_t gfp_mask)
757
{
758
	struct dentry *parent = dget_parent(path->dentry);
759 760 761 762
	struct inode *dir = parent->d_inode;
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs4_opendata *p;

763
	p = kzalloc(sizeof(*p), gfp_mask);
764 765
	if (p == NULL)
		goto err;
766
	p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
767 768
	if (p->o_arg.seqid == NULL)
		goto err_free;
769 770
	path_get(path);
	p->path = *path;
771 772 773 774
	p->dir = parent;
	p->owner = sp;
	atomic_inc(&sp->so_count);
	p->o_arg.fh = NFS_FH(dir);
775 776
	p->o_arg.open_flags = flags;
	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
777
	p->o_arg.clientid = server->nfs_client->cl_clientid;
778
	p->o_arg.id = sp->so_owner_id.id;
779
	p->o_arg.name = &p->path.dentry->d_name;
780 781 782
	p->o_arg.server = server;
	p->o_arg.bitmask = server->attr_bitmask;
	p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
783 784 785
	if (flags & O_CREAT) {
		u32 *s;

786 787
		p->o_arg.u.attrs = &p->attrs;
		memcpy(&p->attrs, attrs, sizeof(p->attrs));
788 789 790
		s = (u32 *) p->o_arg.u.verifier.data;
		s[0] = jiffies;
		s[1] = current->pid;
791
	}
792 793 794
	p->c_arg.fh = &p->o_res.fh;
	p->c_arg.stateid = &p->o_res.stateid;
	p->c_arg.seqid = p->o_arg.seqid;
795
	nfs4_init_opendata_res(p);
796
	kref_init(&p->kref);
797 798 799 800 801 802 803 804
	return p;
err_free:
	kfree(p);
err:
	dput(parent);
	return NULL;
}

805
static void nfs4_opendata_free(struct kref *kref)
806
{
807 808 809 810
	struct nfs4_opendata *p = container_of(kref,
			struct nfs4_opendata, kref);

	nfs_free_seqid(p->o_arg.seqid);
811 812
	if (p->state != NULL)
		nfs4_put_open_state(p->state);
813 814
	nfs4_put_state_owner(p->owner);
	dput(p->dir);
J
Jan Blunck 已提交
815
	path_put(&p->path);
816 817 818 819 820 821 822
	kfree(p);
}

static void nfs4_opendata_put(struct nfs4_opendata *p)
{
	if (p != NULL)
		kref_put(&p->kref, nfs4_opendata_free);
823 824
}

825 826 827 828 829 830 831 832
static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
{
	int ret;

	ret = rpc_wait_for_completion_task(task);
	return ret;
}

833
static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
834 835
{
	int ret = 0;
836 837 838 839

	if (open_mode & O_EXCL)
		goto out;
	switch (mode & (FMODE_READ|FMODE_WRITE)) {
840
		case FMODE_READ:
841 842
			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
				&& state->n_rdonly != 0;
843 844
			break;
		case FMODE_WRITE:
845 846
			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
				&& state->n_wronly != 0;
847 848
			break;
		case FMODE_READ|FMODE_WRITE:
849 850
			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
				&& state->n_rdwr != 0;
851
	}
852
out:
853 854 855
	return ret;
}

856
static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
857
{
858
	if ((delegation->type & fmode) != fmode)
859
		return 0;
860
	if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
861
		return 0;
862
	nfs_mark_delegation_referenced(delegation);
863 864 865
	return 1;
}

866
static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
867
{
868
	switch (fmode) {
869 870 871 872 873 874 875 876 877
		case FMODE_WRITE:
			state->n_wronly++;
			break;
		case FMODE_READ:
			state->n_rdonly++;
			break;
		case FMODE_READ|FMODE_WRITE:
			state->n_rdwr++;
	}
878
	nfs4_state_set_mode_locked(state, state->state | fmode);
879 880
}

881
static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
882 883 884 885
{
	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
		memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
	memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
886
	switch (fmode) {
887 888 889 890 891 892 893 894 895
		case FMODE_READ:
			set_bit(NFS_O_RDONLY_STATE, &state->flags);
			break;
		case FMODE_WRITE:
			set_bit(NFS_O_WRONLY_STATE, &state->flags);
			break;
		case FMODE_READ|FMODE_WRITE:
			set_bit(NFS_O_RDWR_STATE, &state->flags);
	}
896 897
}

898
static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
899
{
900
	write_seqlock(&state->seqlock);
901
	nfs_set_open_stateid_locked(state, stateid, fmode);
902
	write_sequnlock(&state->seqlock);
903 904
}

905
static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
L
Linus Torvalds 已提交
906
{
907 908 909 910 911
	/*
	 * Protect the call to nfs4_state_set_mode_locked and
	 * serialise the stateid update
	 */
	write_seqlock(&state->seqlock);
912 913 914 915 916
	if (deleg_stateid != NULL) {
		memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
		set_bit(NFS_DELEGATED_STATE, &state->flags);
	}
	if (open_stateid != NULL)
917
		nfs_set_open_stateid_locked(state, open_stateid, fmode);
918 919
	write_sequnlock(&state->seqlock);
	spin_lock(&state->owner->so_lock);
920
	update_open_stateflags(state, fmode);
921
	spin_unlock(&state->owner->so_lock);
L
Linus Torvalds 已提交
922 923
}

924
static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
925 926 927 928 929
{
	struct nfs_inode *nfsi = NFS_I(state->inode);
	struct nfs_delegation *deleg_cur;
	int ret = 0;

930
	fmode &= (FMODE_READ|FMODE_WRITE);
931 932 933 934 935 936 937 938

	rcu_read_lock();
	deleg_cur = rcu_dereference(nfsi->delegation);
	if (deleg_cur == NULL)
		goto no_delegation;

	spin_lock(&deleg_cur->lock);
	if (nfsi->delegation != deleg_cur ||
939
	    (deleg_cur->type & fmode) != fmode)
940 941 942 943 944 945 946
		goto no_delegation_unlock;

	if (delegation == NULL)
		delegation = &deleg_cur->stateid;
	else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
		goto no_delegation_unlock;

947
	nfs_mark_delegation_referenced(deleg_cur);
948
	__update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
949 950 951 952 953 954 955
	ret = 1;
no_delegation_unlock:
	spin_unlock(&deleg_cur->lock);
no_delegation:
	rcu_read_unlock();

	if (!ret && open_stateid != NULL) {
956
		__update_open_stateid(state, open_stateid, NULL, fmode);
957 958 959 960 961 962 963
		ret = 1;
	}

	return ret;
}


964
static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
965 966 967 968 969
{
	struct nfs_delegation *delegation;

	rcu_read_lock();
	delegation = rcu_dereference(NFS_I(inode)->delegation);
970
	if (delegation == NULL || (delegation->type & fmode) == fmode) {
971 972 973 974 975 976 977
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();
	nfs_inode_return_delegation(inode);
}

978
static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
979 980 981 982
{
	struct nfs4_state *state = opendata->state;
	struct nfs_inode *nfsi = NFS_I(state->inode);
	struct nfs_delegation *delegation;
983 984
	int open_mode = opendata->o_arg.open_flags & O_EXCL;
	fmode_t fmode = opendata->o_arg.fmode;
985 986 987 988
	nfs4_stateid stateid;
	int ret = -EAGAIN;

	for (;;) {
989
		if (can_open_cached(state, fmode, open_mode)) {
990
			spin_lock(&state->owner->so_lock);
991 992
			if (can_open_cached(state, fmode, open_mode)) {
				update_open_stateflags(state, fmode);
993 994 995 996 997
				spin_unlock(&state->owner->so_lock);
				goto out_return_state;
			}
			spin_unlock(&state->owner->so_lock);
		}
998 999 1000
		rcu_read_lock();
		delegation = rcu_dereference(nfsi->delegation);
		if (delegation == NULL ||
1001
		    !can_open_delegated(delegation, fmode)) {
1002
			rcu_read_unlock();
1003
			break;
1004
		}
1005 1006 1007
		/* Save the delegation */
		memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
		rcu_read_unlock();
1008
		ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1009 1010 1011
		if (ret != 0)
			goto out;
		ret = -EAGAIN;
1012 1013

		/* Try to update the stateid using the delegation */
1014
		if (update_open_stateid(state, NULL, &stateid, fmode))
1015
			goto out_return_state;
1016 1017 1018 1019 1020 1021 1022 1023
	}
out:
	return ERR_PTR(ret);
out_return_state:
	atomic_inc(&state->count);
	return state;
}

1024 1025 1026 1027
static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
	struct inode *inode;
	struct nfs4_state *state = NULL;
1028
	struct nfs_delegation *delegation;
1029
	int ret;
1030

1031
	if (!data->rpc_done) {
1032
		state = nfs4_try_open_cached(data);
1033 1034 1035
		goto out;
	}

1036
	ret = -EAGAIN;
1037
	if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1038
		goto err;
1039
	inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1040
	ret = PTR_ERR(inode);
1041
	if (IS_ERR(inode))
1042 1043
		goto err;
	ret = -ENOMEM;
1044 1045
	state = nfs4_get_open_state(inode, data->owner);
	if (state == NULL)
1046
		goto err_put_inode;
1047 1048 1049
	if (data->o_res.delegation_type != 0) {
		int delegation_flags = 0;

1050 1051 1052 1053 1054
		rcu_read_lock();
		delegation = rcu_dereference(NFS_I(inode)->delegation);
		if (delegation)
			delegation_flags = delegation->flags;
		rcu_read_unlock();
1055
		if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1056 1057 1058 1059 1060 1061 1062 1063
			nfs_inode_set_delegation(state->inode,
					data->owner->so_cred,
					&data->o_res);
		else
			nfs_inode_reclaim_delegation(state->inode,
					data->owner->so_cred,
					&data->o_res);
	}
1064 1065

	update_open_stateid(state, &data->o_res.stateid, NULL,
1066
			data->o_arg.fmode);
1067
	iput(inode);
1068
out:
1069
	return state;
1070 1071 1072 1073
err_put_inode:
	iput(inode);
err:
	return ERR_PTR(ret);
1074 1075
}

1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
{
	struct nfs_inode *nfsi = NFS_I(state->inode);
	struct nfs_open_context *ctx;

	spin_lock(&state->inode->i_lock);
	list_for_each_entry(ctx, &nfsi->open_files, list) {
		if (ctx->state != state)
			continue;
		get_nfs_open_context(ctx);
		spin_unlock(&state->inode->i_lock);
		return ctx;
	}
	spin_unlock(&state->inode->i_lock);
	return ERR_PTR(-ENOENT);
}

T
Trond Myklebust 已提交
1093 1094 1095 1096
static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
{
	struct nfs4_opendata *opendata;

1097
	opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
T
Trond Myklebust 已提交
1098 1099 1100 1101 1102 1103 1104
	if (opendata == NULL)
		return ERR_PTR(-ENOMEM);
	opendata->state = state;
	atomic_inc(&state->count);
	return opendata;
}

1105
static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1106
{
1107
	struct nfs4_state *newstate;
1108 1109
	int ret;

1110 1111
	opendata->o_arg.open_flags = 0;
	opendata->o_arg.fmode = fmode;
1112 1113 1114
	memset(&opendata->o_res, 0, sizeof(opendata->o_res));
	memset(&opendata->c_res, 0, sizeof(opendata->c_res));
	nfs4_init_opendata_res(opendata);
1115
	ret = _nfs4_recover_proc_open(opendata);
1116 1117
	if (ret != 0)
		return ret; 
1118
	newstate = nfs4_opendata_to_nfs4_state(opendata);
1119 1120
	if (IS_ERR(newstate))
		return PTR_ERR(newstate);
1121
	nfs4_close_state(&opendata->path, newstate, fmode);
1122
	*res = newstate;
1123 1124 1125 1126 1127 1128 1129 1130 1131
	return 0;
}

static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
{
	struct nfs4_state *newstate;
	int ret;

	/* memory barrier prior to reading state->n_* */
1132
	clear_bit(NFS_DELEGATED_STATE, &state->flags);
1133 1134
	smp_rmb();
	if (state->n_rdwr != 0) {
T
Trond Myklebust 已提交
1135
		clear_bit(NFS_O_RDWR_STATE, &state->flags);
1136
		ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1137 1138
		if (ret != 0)
			return ret;
1139 1140
		if (newstate != state)
			return -ESTALE;
1141 1142
	}
	if (state->n_wronly != 0) {
T
Trond Myklebust 已提交
1143
		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1144
		ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1145 1146
		if (ret != 0)
			return ret;
1147 1148
		if (newstate != state)
			return -ESTALE;
1149 1150
	}
	if (state->n_rdonly != 0) {
T
Trond Myklebust 已提交
1151
		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1152
		ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1153 1154
		if (ret != 0)
			return ret;
1155 1156
		if (newstate != state)
			return -ESTALE;
1157
	}
1158 1159 1160 1161 1162 1163
	/*
	 * We may have performed cached opens for all three recoveries.
	 * Check if we need to update the current stateid.
	 */
	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
	    memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1164
		write_seqlock(&state->seqlock);
1165 1166
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
			memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1167
		write_sequnlock(&state->seqlock);
1168
	}
1169 1170 1171
	return 0;
}

L
Linus Torvalds 已提交
1172 1173 1174 1175
/*
 * OPEN_RECLAIM:
 * 	reclaim state on the server after a reboot.
 */
1176
static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
L
Linus Torvalds 已提交
1177
{
1178
	struct nfs_delegation *delegation;
1179
	struct nfs4_opendata *opendata;
1180
	fmode_t delegation_type = 0;
L
Linus Torvalds 已提交
1181 1182
	int status;

T
Trond Myklebust 已提交
1183 1184 1185
	opendata = nfs4_open_recoverdata_alloc(ctx, state);
	if (IS_ERR(opendata))
		return PTR_ERR(opendata);
1186 1187
	opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
	opendata->o_arg.fh = NFS_FH(state->inode);
1188 1189
	rcu_read_lock();
	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1190
	if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1191
		delegation_type = delegation->type;
1192
	rcu_read_unlock();
1193 1194
	opendata->o_arg.u.delegation_type = delegation_type;
	status = nfs4_open_recover(opendata, state);
1195
	nfs4_opendata_put(opendata);
L
Linus Torvalds 已提交
1196 1197 1198
	return status;
}

1199
static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
L
Linus Torvalds 已提交
1200 1201 1202 1203 1204
{
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = { };
	int err;
	do {
1205
		err = _nfs4_do_open_reclaim(ctx, state);
1206
		if (err != -NFS4ERR_DELAY)
1207 1208
			break;
		nfs4_handle_exception(server, err, &exception);
L
Linus Torvalds 已提交
1209 1210 1211 1212
	} while (exception.retry);
	return err;
}

1213 1214 1215 1216 1217 1218 1219 1220
static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
	struct nfs_open_context *ctx;
	int ret;

	ctx = nfs4_state_find_open_context(state);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);
1221
	ret = nfs4_do_open_reclaim(ctx, state);
1222 1223 1224 1225
	put_nfs_open_context(ctx);
	return ret;
}

1226
static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
L
Linus Torvalds 已提交
1227
{
1228
	struct nfs4_opendata *opendata;
1229
	int ret;
L
Linus Torvalds 已提交
1230

T
Trond Myklebust 已提交
1231 1232 1233
	opendata = nfs4_open_recoverdata_alloc(ctx, state);
	if (IS_ERR(opendata))
		return PTR_ERR(opendata);
1234
	opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1235
	memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1236
			sizeof(opendata->o_arg.u.delegation.data));
1237
	ret = nfs4_open_recover(opendata, state);
1238
	nfs4_opendata_put(opendata);
1239
	return ret;
L
Linus Torvalds 已提交
1240 1241
}

1242
int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
L
Linus Torvalds 已提交
1243 1244
{
	struct nfs4_exception exception = { };
1245
	struct nfs_server *server = NFS_SERVER(state->inode);
L
Linus Torvalds 已提交
1246 1247
	int err;
	do {
1248
		err = _nfs4_open_delegation_recall(ctx, state, stateid);
L
Linus Torvalds 已提交
1249 1250
		switch (err) {
			case 0:
1251 1252 1253
			case -ENOENT:
			case -ESTALE:
				goto out;
1254 1255 1256 1257 1258
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
			case -NFS4ERR_DEADSESSION:
1259
				nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1260
				goto out;
L
Linus Torvalds 已提交
1261 1262 1263 1264
			case -NFS4ERR_STALE_CLIENTID:
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_EXPIRED:
				/* Don't recall a delegation if it was lost */
1265
				nfs4_schedule_lease_recovery(server->nfs_client);
1266 1267 1268 1269 1270 1271 1272 1273
				goto out;
			case -ERESTARTSYS:
				/*
				 * The show must go on: exit, but mark the
				 * stateid as needing recovery.
				 */
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_BAD_STATEID:
1274
				nfs4_schedule_stateid_recovery(server, state);
1275 1276 1277 1278 1279 1280 1281
			case -EKEYEXPIRED:
				/*
				 * User RPCSEC_GSS context has expired.
				 * We cannot recover this stateid now, so
				 * skip it and allow recovery thread to
				 * proceed.
				 */
1282 1283 1284
			case -ENOMEM:
				err = 0;
				goto out;
L
Linus Torvalds 已提交
1285 1286 1287
		}
		err = nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
1288
out:
L
Linus Torvalds 已提交
1289 1290 1291
	return err;
}

1292 1293 1294 1295 1296
static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_opendata *data = calldata;

	data->rpc_status = task->tk_status;
1297
	if (data->rpc_status == 0) {
1298 1299
		memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
				sizeof(data->o_res.stateid.data));
1300
		nfs_confirm_seqid(&data->owner->so_seqid, 0);
1301
		renew_lease(data->o_res.server, data->timestamp);
1302
		data->rpc_done = 1;
1303
	}
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
}

static void nfs4_open_confirm_release(void *calldata)
{
	struct nfs4_opendata *data = calldata;
	struct nfs4_state *state = NULL;

	/* If this request hasn't been cancelled, do nothing */
	if (data->cancelled == 0)
		goto out_free;
	/* In case of error, no cleanup! */
1315
	if (!data->rpc_done)
1316 1317
		goto out_free;
	state = nfs4_opendata_to_nfs4_state(data);
1318
	if (!IS_ERR(state))
1319
		nfs4_close_state(&data->path, state, data->o_arg.fmode);
1320
out_free:
1321
	nfs4_opendata_put(data);
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
}

static const struct rpc_call_ops nfs4_open_confirm_ops = {
	.rpc_call_done = nfs4_open_confirm_done,
	.rpc_release = nfs4_open_confirm_release,
};

/*
 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 */
static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
{
	struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
	struct rpc_task *task;
1336 1337 1338 1339 1340 1341
	struct  rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
		.rpc_argp = &data->c_arg,
		.rpc_resp = &data->c_res,
		.rpc_cred = data->owner->so_cred,
	};
T
Trond Myklebust 已提交
1342 1343
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
1344
		.rpc_message = &msg,
T
Trond Myklebust 已提交
1345 1346
		.callback_ops = &nfs4_open_confirm_ops,
		.callback_data = data,
1347
		.workqueue = nfsiod_workqueue,
T
Trond Myklebust 已提交
1348 1349
		.flags = RPC_TASK_ASYNC,
	};
L
Linus Torvalds 已提交
1350 1351
	int status;

1352
	kref_get(&data->kref);
1353 1354
	data->rpc_done = 0;
	data->rpc_status = 0;
1355
	data->timestamp = jiffies;
T
Trond Myklebust 已提交
1356
	task = rpc_run_task(&task_setup_data);
1357
	if (IS_ERR(task))
1358 1359 1360 1361 1362 1363 1364
		return PTR_ERR(task);
	status = nfs4_wait_for_completion_rpc_task(task);
	if (status != 0) {
		data->cancelled = 1;
		smp_wmb();
	} else
		status = data->rpc_status;
1365
	rpc_put_task(task);
L
Linus Torvalds 已提交
1366 1367 1368
	return status;
}

1369
static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
L
Linus Torvalds 已提交
1370
{
1371 1372
	struct nfs4_opendata *data = calldata;
	struct nfs4_state_owner *sp = data->owner;
1373

1374 1375
	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
		return;
1376 1377 1378 1379 1380 1381 1382
	/*
	 * Check if we still need to send an OPEN call, or if we can use
	 * a delegation instead.
	 */
	if (data->state != NULL) {
		struct nfs_delegation *delegation;

1383
		if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1384
			goto out_no_action;
1385 1386 1387
		rcu_read_lock();
		delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
		if (delegation != NULL &&
1388
		    test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1389
			rcu_read_unlock();
1390
			goto out_no_action;
1391 1392 1393
		}
		rcu_read_unlock();
	}
1394
	/* Update sequence id. */
1395
	data->o_arg.id = sp->so_owner_id.id;
1396
	data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
T
Trond Myklebust 已提交
1397
	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1398
		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
T
Trond Myklebust 已提交
1399 1400
		nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
	}
1401
	data->timestamp = jiffies;
1402
	if (nfs4_setup_sequence(data->o_arg.server,
1403 1404 1405
				&data->o_arg.seq_args,
				&data->o_res.seq_res, 1, task))
		return;
1406
	rpc_call_start(task);
1407 1408 1409 1410
	return;
out_no_action:
	task->tk_action = NULL;

1411
}
L
Linus Torvalds 已提交
1412

1413 1414 1415 1416 1417 1418
static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
{
	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
	nfs4_open_prepare(task, calldata);
}

1419 1420 1421
static void nfs4_open_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_opendata *data = calldata;
L
Linus Torvalds 已提交
1422

1423
	data->rpc_status = task->tk_status;
1424

1425 1426
	if (!nfs4_sequence_done(task, &data->o_res.seq_res))
		return;
1427

1428 1429
	if (task->tk_status == 0) {
		switch (data->o_res.f_attr->mode & S_IFMT) {
1430 1431 1432
			case S_IFREG:
				break;
			case S_IFLNK:
1433
				data->rpc_status = -ELOOP;
1434 1435
				break;
			case S_IFDIR:
1436
				data->rpc_status = -EISDIR;
1437 1438
				break;
			default:
1439
				data->rpc_status = -ENOTDIR;
1440
		}
1441
		renew_lease(data->o_res.server, data->timestamp);
1442 1443
		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
			nfs_confirm_seqid(&data->owner->so_seqid, 0);
1444
	}
1445
	data->rpc_done = 1;
1446
}
1447

1448 1449 1450 1451 1452 1453 1454 1455 1456
static void nfs4_open_release(void *calldata)
{
	struct nfs4_opendata *data = calldata;
	struct nfs4_state *state = NULL;

	/* If this request hasn't been cancelled, do nothing */
	if (data->cancelled == 0)
		goto out_free;
	/* In case of error, no cleanup! */
1457
	if (data->rpc_status != 0 || !data->rpc_done)
1458 1459 1460 1461 1462
		goto out_free;
	/* In case we need an open_confirm, no cleanup! */
	if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
		goto out_free;
	state = nfs4_opendata_to_nfs4_state(data);
1463
	if (!IS_ERR(state))
1464
		nfs4_close_state(&data->path, state, data->o_arg.fmode);
1465
out_free:
1466
	nfs4_opendata_put(data);
1467 1468 1469 1470 1471 1472 1473 1474
}

static const struct rpc_call_ops nfs4_open_ops = {
	.rpc_call_prepare = nfs4_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

1475 1476 1477 1478 1479 1480 1481
static const struct rpc_call_ops nfs4_recover_open_ops = {
	.rpc_call_prepare = nfs4_recover_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1482 1483 1484 1485 1486 1487
{
	struct inode *dir = data->dir->d_inode;
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_openargs *o_arg = &data->o_arg;
	struct nfs_openres *o_res = &data->o_res;
	struct rpc_task *task;
1488 1489 1490 1491 1492 1493
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
		.rpc_argp = o_arg,
		.rpc_resp = o_res,
		.rpc_cred = data->owner->so_cred,
	};
T
Trond Myklebust 已提交
1494 1495
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
1496
		.rpc_message = &msg,
T
Trond Myklebust 已提交
1497 1498
		.callback_ops = &nfs4_open_ops,
		.callback_data = data,
1499
		.workqueue = nfsiod_workqueue,
T
Trond Myklebust 已提交
1500 1501
		.flags = RPC_TASK_ASYNC,
	};
1502 1503
	int status;

1504
	kref_get(&data->kref);
1505 1506
	data->rpc_done = 0;
	data->rpc_status = 0;
1507
	data->cancelled = 0;
1508 1509
	if (isrecover)
		task_setup_data.callback_ops = &nfs4_recover_open_ops;
T
Trond Myklebust 已提交
1510
	task = rpc_run_task(&task_setup_data);
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
        if (IS_ERR(task))
                return PTR_ERR(task);
        status = nfs4_wait_for_completion_rpc_task(task);
        if (status != 0) {
                data->cancelled = 1;
                smp_wmb();
        } else
                status = data->rpc_status;
        rpc_put_task(task);

	return status;
}

static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
{
	struct inode *dir = data->dir->d_inode;
	struct nfs_openres *o_res = &data->o_res;
        int status;

	status = nfs4_run_open_task(data, 1);
	if (status != 0 || !data->rpc_done)
		return status;

	nfs_refresh_inode(dir, o_res->dir_attr);

	if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
		status = _nfs4_proc_open_confirm(data);
		if (status != 0)
			return status;
	}

	return status;
}

/*
 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 */
static int _nfs4_proc_open(struct nfs4_opendata *data)
{
	struct inode *dir = data->dir->d_inode;
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_openargs *o_arg = &data->o_arg;
	struct nfs_openres *o_res = &data->o_res;
	int status;

	status = nfs4_run_open_task(data, 0);
1557
	if (status != 0 || !data->rpc_done)
1558 1559
		return status;

1560 1561 1562 1563 1564
	if (o_arg->open_flags & O_CREAT) {
		update_changeattr(dir, &o_res->cinfo);
		nfs_post_op_update_inode(dir, o_res->dir_attr);
	} else
		nfs_refresh_inode(dir, o_res->dir_attr);
T
Trond Myklebust 已提交
1565 1566
	if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
		server->caps &= ~NFS_CAP_POSIX_LOCK;
L
Linus Torvalds 已提交
1567
	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1568
		status = _nfs4_proc_open_confirm(data);
L
Linus Torvalds 已提交
1569
		if (status != 0)
1570
			return status;
L
Linus Torvalds 已提交
1571 1572
	}
	if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1573
		_nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1574
	return 0;
L
Linus Torvalds 已提交
1575 1576
}

A
Andy Adamson 已提交
1577
static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1578
{
1579
	unsigned int loop;
1580
	int ret;
1581

1582
	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1583
		ret = nfs4_wait_clnt_recover(clp);
1584
		if (ret != 0)
1585
			break;
1586 1587
		if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
		    !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1588
			break;
1589
		nfs4_schedule_state_manager(clp);
1590
		ret = -EIO;
1591
	}
1592
	return ret;
1593 1594
}

A
Andy Adamson 已提交
1595 1596 1597 1598 1599
static int nfs4_recover_expired_lease(struct nfs_server *server)
{
	return nfs4_client_recover_expired_lease(server->nfs_client);
}

L
Linus Torvalds 已提交
1600 1601 1602 1603 1604
/*
 * OPEN_EXPIRED:
 * 	reclaim state on the server after a network partition.
 * 	Assumes caller holds the appropriate lock
 */
1605
static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
L
Linus Torvalds 已提交
1606
{
1607
	struct nfs4_opendata *opendata;
1608
	int ret;
L
Linus Torvalds 已提交
1609

T
Trond Myklebust 已提交
1610 1611 1612
	opendata = nfs4_open_recoverdata_alloc(ctx, state);
	if (IS_ERR(opendata))
		return PTR_ERR(opendata);
1613
	ret = nfs4_open_recover(opendata, state);
1614
	if (ret == -ESTALE)
1615
		d_drop(ctx->path.dentry);
1616
	nfs4_opendata_put(opendata);
1617
	return ret;
L
Linus Torvalds 已提交
1618 1619
}

1620
static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1621
{
1622
	struct nfs_server *server = NFS_SERVER(state->inode);
1623 1624 1625 1626
	struct nfs4_exception exception = { };
	int err;

	do {
1627
		err = _nfs4_open_expired(ctx, state);
1628 1629 1630 1631 1632 1633 1634 1635
		switch (err) {
		default:
			goto out;
		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
			nfs4_handle_exception(server, err, &exception);
			err = 0;
		}
1636
	} while (exception.retry);
1637
out:
1638 1639 1640
	return err;
}

L
Linus Torvalds 已提交
1641 1642 1643
static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
	struct nfs_open_context *ctx;
1644
	int ret;
L
Linus Torvalds 已提交
1645

1646 1647 1648
	ctx = nfs4_state_find_open_context(state);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);
1649
	ret = nfs4_do_open_expired(ctx, state);
1650 1651
	put_nfs_open_context(ctx);
	return ret;
L
Linus Torvalds 已提交
1652 1653
}

1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
/*
 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
 * fields corresponding to attributes that were used to store the verifier.
 * Make sure we clobber those fields in the later setattr call
 */
static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
{
	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
	    !(sattr->ia_valid & ATTR_ATIME_SET))
		sattr->ia_valid |= ATTR_ATIME;

	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
	    !(sattr->ia_valid & ATTR_MTIME_SET))
		sattr->ia_valid |= ATTR_MTIME;
}

L
Linus Torvalds 已提交
1670
/*
1671
 * Returns a referenced nfs4_state
L
Linus Torvalds 已提交
1672
 */
1673
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)
L
Linus Torvalds 已提交
1674 1675 1676 1677
{
	struct nfs4_state_owner  *sp;
	struct nfs4_state     *state = NULL;
	struct nfs_server       *server = NFS_SERVER(dir);
1678
	struct nfs4_opendata *opendata;
1679
	int status;
L
Linus Torvalds 已提交
1680 1681 1682 1683 1684 1685 1686

	/* Protect against reboot recovery conflicts */
	status = -ENOMEM;
	if (!(sp = nfs4_get_state_owner(server, cred))) {
		dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
		goto out_err;
	}
1687 1688
	status = nfs4_recover_expired_lease(server);
	if (status != 0)
1689
		goto err_put_state_owner;
1690
	if (path->dentry->d_inode != NULL)
1691
		nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1692
	status = -ENOMEM;
1693
	opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1694
	if (opendata == NULL)
T
Trond Myklebust 已提交
1695
		goto err_put_state_owner;
L
Linus Torvalds 已提交
1696

1697 1698 1699
	if (path->dentry->d_inode != NULL)
		opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);

1700
	status = _nfs4_proc_open(opendata);
L
Linus Torvalds 已提交
1701
	if (status != 0)
1702
		goto err_opendata_put;
L
Linus Torvalds 已提交
1703

1704
	state = nfs4_opendata_to_nfs4_state(opendata);
1705 1706
	status = PTR_ERR(state);
	if (IS_ERR(state))
1707
		goto err_opendata_put;
T
Trond Myklebust 已提交
1708
	if (server->caps & NFS_CAP_POSIX_LOCK)
1709
		set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721

	if (opendata->o_arg.open_flags & O_EXCL) {
		nfs4_exclusive_attrset(opendata, sattr);

		nfs_fattr_init(opendata->o_res.f_attr);
		status = nfs4_do_setattr(state->inode, cred,
				opendata->o_res.f_attr, sattr,
				state);
		if (status == 0)
			nfs_setattr_update_inode(state->inode, sattr);
		nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
	}
1722
	nfs4_opendata_put(opendata);
L
Linus Torvalds 已提交
1723 1724 1725
	nfs4_put_state_owner(sp);
	*res = state;
	return 0;
1726 1727
err_opendata_put:
	nfs4_opendata_put(opendata);
1728 1729
err_put_state_owner:
	nfs4_put_state_owner(sp);
L
Linus Torvalds 已提交
1730 1731 1732 1733 1734 1735
out_err:
	*res = NULL;
	return status;
}


1736
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)
L
Linus Torvalds 已提交
1737 1738 1739 1740 1741 1742
{
	struct nfs4_exception exception = { };
	struct nfs4_state *res;
	int status;

	do {
1743
		status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
L
Linus Torvalds 已提交
1744 1745 1746 1747 1748 1749 1750 1751
		if (status == 0)
			break;
		/* NOTE: BAD_SEQID means the server and client disagree about the
		 * book-keeping w.r.t. state-changing operations
		 * (OPEN/CLOSE/LOCK/LOCKU...)
		 * It is actually a sign of a bug on the client or on the server.
		 *
		 * If we receive a BAD_SEQID error in the particular case of
1752
		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
L
Linus Torvalds 已提交
1753 1754 1755 1756 1757
		 * have unhashed the old state_owner for us, and that we can
		 * therefore safely retry using a new one. We should still warn
		 * the user though...
		 */
		if (status == -NFS4ERR_BAD_SEQID) {
1758 1759 1760
			printk(KERN_WARNING "NFS: v4 server %s "
					" returned a bad sequence-id error!\n",
					NFS_SERVER(dir)->nfs_client->cl_hostname);
L
Linus Torvalds 已提交
1761 1762 1763
			exception.retry = 1;
			continue;
		}
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773
		/*
		 * BAD_STATEID on OPEN means that the server cancelled our
		 * state before it received the OPEN_CONFIRM.
		 * Recover by retrying the request as per the discussion
		 * on Page 181 of RFC3530.
		 */
		if (status == -NFS4ERR_BAD_STATEID) {
			exception.retry = 1;
			continue;
		}
1774 1775 1776 1777 1778
		if (status == -EAGAIN) {
			/* We must have found a delegation */
			exception.retry = 1;
			continue;
		}
L
Linus Torvalds 已提交
1779 1780 1781 1782 1783 1784
		res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
					status, &exception));
	} while (exception.retry);
	return res;
}

1785 1786 1787
static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs4_state *state)
L
Linus Torvalds 已提交
1788
{
1789
	struct nfs_server *server = NFS_SERVER(inode);
L
Linus Torvalds 已提交
1790
        struct nfs_setattrargs  arg = {
1791
                .fh             = NFS_FH(inode),
L
Linus Torvalds 已提交
1792 1793 1794 1795 1796 1797 1798 1799 1800
                .iap            = sattr,
		.server		= server,
		.bitmask = server->attr_bitmask,
        };
        struct nfs_setattrres  res = {
		.fattr		= fattr,
		.server		= server,
        };
        struct rpc_message msg = {
1801 1802 1803 1804
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
		.rpc_cred	= cred,
L
Linus Torvalds 已提交
1805
        };
1806
	unsigned long timestamp = jiffies;
1807
	int status;
L
Linus Torvalds 已提交
1808

1809
	nfs_fattr_init(fattr);
L
Linus Torvalds 已提交
1810

1811 1812 1813
	if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
		/* Use that stateid */
	} else if (state != NULL) {
1814
		nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1815
	} else
L
Linus Torvalds 已提交
1816 1817
		memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));

A
Andy Adamson 已提交
1818
	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1819 1820
	if (status == 0 && state != NULL)
		renew_lease(server, timestamp);
1821
	return status;
L
Linus Torvalds 已提交
1822 1823
}

1824 1825 1826
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
			   struct nfs_fattr *fattr, struct iattr *sattr,
			   struct nfs4_state *state)
L
Linus Torvalds 已提交
1827
{
1828
	struct nfs_server *server = NFS_SERVER(inode);
L
Linus Torvalds 已提交
1829 1830 1831 1832
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
1833
				_nfs4_do_setattr(inode, cred, fattr, sattr, state),
L
Linus Torvalds 已提交
1834 1835 1836 1837 1838 1839
				&exception);
	} while (exception.retry);
	return err;
}

struct nfs4_closedata {
1840
	struct path path;
L
Linus Torvalds 已提交
1841 1842 1843 1844
	struct inode *inode;
	struct nfs4_state *state;
	struct nfs_closeargs arg;
	struct nfs_closeres res;
1845
	struct nfs_fattr fattr;
1846
	unsigned long timestamp;
F
Fred Isaman 已提交
1847 1848
	bool roc;
	u32 roc_barrier;
L
Linus Torvalds 已提交
1849 1850
};

1851
static void nfs4_free_closedata(void *data)
1852
{
1853 1854
	struct nfs4_closedata *calldata = data;
	struct nfs4_state_owner *sp = calldata->state->owner;
1855

F
Fred Isaman 已提交
1856 1857
	if (calldata->roc)
		pnfs_roc_release(calldata->state->inode);
1858 1859 1860
	nfs4_put_open_state(calldata->state);
	nfs_free_seqid(calldata->arg.seqid);
	nfs4_put_state_owner(sp);
J
Jan Blunck 已提交
1861
	path_put(&calldata->path);
1862 1863 1864
	kfree(calldata);
}

1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
		fmode_t fmode)
{
	spin_lock(&state->owner->so_lock);
	if (!(fmode & FMODE_READ))
		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
	if (!(fmode & FMODE_WRITE))
		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
	clear_bit(NFS_O_RDWR_STATE, &state->flags);
	spin_unlock(&state->owner->so_lock);
}

1877
static void nfs4_close_done(struct rpc_task *task, void *data)
L
Linus Torvalds 已提交
1878
{
1879
	struct nfs4_closedata *calldata = data;
L
Linus Torvalds 已提交
1880 1881 1882
	struct nfs4_state *state = calldata->state;
	struct nfs_server *server = NFS_SERVER(calldata->inode);

1883 1884
	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
		return;
L
Linus Torvalds 已提交
1885 1886 1887 1888 1889
        /* hmm. we are done with the inode, and in the process of freeing
	 * the state_owner. we keep this around to process errors
	 */
	switch (task->tk_status) {
		case 0:
F
Fred Isaman 已提交
1890 1891 1892
			if (calldata->roc)
				pnfs_roc_set_barrier(state->inode,
						     calldata->roc_barrier);
1893
			nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1894
			renew_lease(server, calldata->timestamp);
1895 1896
			nfs4_close_clear_stateid_flags(state,
					calldata->arg.fmode);
L
Linus Torvalds 已提交
1897 1898
			break;
		case -NFS4ERR_STALE_STATEID:
1899 1900
		case -NFS4ERR_OLD_STATEID:
		case -NFS4ERR_BAD_STATEID:
L
Linus Torvalds 已提交
1901
		case -NFS4ERR_EXPIRED:
1902
			if (calldata->arg.fmode == 0)
1903
				break;
L
Linus Torvalds 已提交
1904
		default:
1905 1906
			if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
				rpc_restart_call_prepare(task);
L
Linus Torvalds 已提交
1907
	}
1908
	nfs_release_seqid(calldata->arg.seqid);
1909
	nfs_refresh_inode(calldata->inode, calldata->res.fattr);
L
Linus Torvalds 已提交
1910 1911
}

T
Trond Myklebust 已提交
1912
static void nfs4_close_prepare(struct rpc_task *task, void *data)
L
Linus Torvalds 已提交
1913
{
T
Trond Myklebust 已提交
1914
	struct nfs4_closedata *calldata = data;
1915
	struct nfs4_state *state = calldata->state;
1916
	int call_close = 0;
1917

1918
	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1919
		return;
1920

1921 1922
	task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
	calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1923
	spin_lock(&state->owner->so_lock);
1924
	/* Calculate the change in open mode */
1925
	if (state->n_rdwr == 0) {
1926
		if (state->n_rdonly == 0) {
1927 1928 1929
			call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
			calldata->arg.fmode &= ~FMODE_READ;
1930 1931
		}
		if (state->n_wronly == 0) {
1932 1933 1934
			call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
			calldata->arg.fmode &= ~FMODE_WRITE;
1935
		}
1936
	}
1937
	spin_unlock(&state->owner->so_lock);
1938 1939

	if (!call_close) {
1940 1941
		/* Note: exit _without_ calling nfs4_close_done */
		task->tk_action = NULL;
1942 1943
		return;
	}
1944

F
Fred Isaman 已提交
1945
	if (calldata->arg.fmode == 0) {
1946
		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
F
Fred Isaman 已提交
1947 1948 1949 1950 1951 1952 1953
		if (calldata->roc &&
		    pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
			rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
				     task, NULL);
			return;
		}
	}
1954

1955
	nfs_fattr_init(calldata->res.fattr);
1956
	calldata->timestamp = jiffies;
1957
	if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1958 1959 1960
				&calldata->arg.seq_args, &calldata->res.seq_res,
				1, task))
		return;
1961
	rpc_call_start(task);
L
Linus Torvalds 已提交
1962 1963
}

1964
static const struct rpc_call_ops nfs4_close_ops = {
T
Trond Myklebust 已提交
1965
	.rpc_call_prepare = nfs4_close_prepare,
1966 1967 1968 1969
	.rpc_call_done = nfs4_close_done,
	.rpc_release = nfs4_free_closedata,
};

L
Linus Torvalds 已提交
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
/* 
 * It is possible for data to be read/written from a mem-mapped file 
 * after the sys_close call (which hits the vfs layer as a flush).
 * This means that we can't safely call nfsv4 close on a file until 
 * the inode is cleared. This in turn means that we are not good
 * NFSv4 citizens - we do not indicate to the server to update the file's 
 * share state even when we are done with one of the three share 
 * stateid's in the inode.
 *
 * NOTE: Caller must be holding the sp->so_owner semaphore!
 */
F
Fred Isaman 已提交
1981
int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
L
Linus Torvalds 已提交
1982
{
1983
	struct nfs_server *server = NFS_SERVER(state->inode);
L
Linus Torvalds 已提交
1984
	struct nfs4_closedata *calldata;
1985 1986
	struct nfs4_state_owner *sp = state->owner;
	struct rpc_task *task;
1987 1988 1989 1990
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
		.rpc_cred = state->owner->so_cred,
	};
T
Trond Myklebust 已提交
1991 1992
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
1993
		.rpc_message = &msg,
T
Trond Myklebust 已提交
1994
		.callback_ops = &nfs4_close_ops,
1995
		.workqueue = nfsiod_workqueue,
T
Trond Myklebust 已提交
1996 1997
		.flags = RPC_TASK_ASYNC,
	};
1998
	int status = -ENOMEM;
L
Linus Torvalds 已提交
1999

2000
	calldata = kzalloc(sizeof(*calldata), gfp_mask);
L
Linus Torvalds 已提交
2001
	if (calldata == NULL)
2002
		goto out;
2003
	calldata->inode = state->inode;
L
Linus Torvalds 已提交
2004
	calldata->state = state;
2005
	calldata->arg.fh = NFS_FH(state->inode);
2006
	calldata->arg.stateid = &state->open_stateid;
L
Linus Torvalds 已提交
2007
	/* Serialization for the sequence id */
2008
	calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2009 2010
	if (calldata->arg.seqid == NULL)
		goto out_free_calldata;
2011
	calldata->arg.fmode = 0;
2012
	calldata->arg.bitmask = server->cache_consistency_bitmask;
2013
	calldata->res.fattr = &calldata->fattr;
2014
	calldata->res.seqid = calldata->arg.seqid;
2015
	calldata->res.server = server;
F
Fred Isaman 已提交
2016
	calldata->roc = roc;
2017 2018
	path_get(path);
	calldata->path = *path;
2019

2020 2021
	msg.rpc_argp = &calldata->arg;
	msg.rpc_resp = &calldata->res;
T
Trond Myklebust 已提交
2022 2023
	task_setup_data.callback_data = calldata;
	task = rpc_run_task(&task_setup_data);
2024 2025
	if (IS_ERR(task))
		return PTR_ERR(task);
2026 2027 2028
	status = 0;
	if (wait)
		status = rpc_wait_for_completion_task(task);
2029
	rpc_put_task(task);
2030
	return status;
2031 2032 2033
out_free_calldata:
	kfree(calldata);
out:
F
Fred Isaman 已提交
2034 2035
	if (roc)
		pnfs_roc_release(state->inode);
2036 2037
	nfs4_put_open_state(state);
	nfs4_put_state_owner(sp);
2038
	return status;
L
Linus Torvalds 已提交
2039 2040
}

2041
static struct inode *
2042
nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
L
Linus Torvalds 已提交
2043 2044 2045
{
	struct nfs4_state *state;

T
Trond Myklebust 已提交
2046
	/* Protect against concurrent sillydeletes */
2047
	state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2048 2049
	if (IS_ERR(state))
		return ERR_CAST(state);
2050
	ctx->state = state;
2051
	return igrab(state->inode);
L
Linus Torvalds 已提交
2052 2053
}

2054
static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
T
Trond Myklebust 已提交
2055 2056 2057 2058 2059 2060 2061 2062
{
	if (ctx->state == NULL)
		return;
	if (is_sync)
		nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
	else
		nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
}
L
Linus Torvalds 已提交
2063 2064 2065

static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
{
B
Benny Halevy 已提交
2066 2067 2068
	struct nfs4_server_caps_arg args = {
		.fhandle = fhandle,
	};
L
Linus Torvalds 已提交
2069 2070 2071
	struct nfs4_server_caps_res res = {};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
B
Benny Halevy 已提交
2072
		.rpc_argp = &args,
L
Linus Torvalds 已提交
2073 2074 2075 2076
		.rpc_resp = &res,
	};
	int status;

A
Andy Adamson 已提交
2077
	status = nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
2078 2079
	if (status == 0) {
		memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2080 2081 2082 2083 2084
		server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
				NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
				NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
				NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
				NFS_CAP_CTIME|NFS_CAP_MTIME);
L
Linus Torvalds 已提交
2085 2086 2087 2088 2089 2090
		if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
			server->caps |= NFS_CAP_ACLS;
		if (res.has_links != 0)
			server->caps |= NFS_CAP_HARDLINKS;
		if (res.has_symlinks != 0)
			server->caps |= NFS_CAP_SYMLINKS;
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
		if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
			server->caps |= NFS_CAP_FILEID;
		if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
			server->caps |= NFS_CAP_MODE;
		if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
			server->caps |= NFS_CAP_NLINK;
		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
			server->caps |= NFS_CAP_OWNER;
		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
			server->caps |= NFS_CAP_OWNER_GROUP;
		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
			server->caps |= NFS_CAP_ATIME;
		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
			server->caps |= NFS_CAP_CTIME;
		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
			server->caps |= NFS_CAP_MTIME;

2108 2109 2110
		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
L
Linus Torvalds 已提交
2111 2112
		server->acl_bitmask = res.acl_bitmask;
	}
A
Andy Adamson 已提交
2113

L
Linus Torvalds 已提交
2114 2115 2116
	return status;
}

2117
int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
L
Linus Torvalds 已提交
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
				_nfs4_server_capabilities(server, fhandle),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *info)
{
	struct nfs4_lookup_root_arg args = {
		.bitmask = nfs4_fattr_bitmap,
	};
	struct nfs4_lookup_res res = {
		.server = server,
2137
		.fattr = info->fattr,
L
Linus Torvalds 已提交
2138 2139 2140 2141 2142 2143 2144
		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
2145

2146
	nfs_fattr_init(info->fattr);
2147
	return nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
}

static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *info)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
				_nfs4_lookup_root(server, fhandle, info),
				&exception);
	} while (exception.retry);
	return err;
}

2163 2164 2165
/*
 * get the file handle for the "/" directory on the server
 */
L
Linus Torvalds 已提交
2166
static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2167
			      struct nfs_fsinfo *info)
L
Linus Torvalds 已提交
2168 2169 2170 2171 2172 2173 2174 2175
{
	int status;

	status = nfs4_lookup_root(server, fhandle, info);
	if (status == 0)
		status = nfs4_server_capabilities(server, fhandle);
	if (status == 0)
		status = nfs4_do_fsinfo(server, fhandle, info);
2176
	return nfs4_map_errors(status);
L
Linus Torvalds 已提交
2177 2178
}

M
Manoj Naik 已提交
2179 2180 2181 2182 2183
/*
 * Get locations and (maybe) other attributes of a referral.
 * Note that we'll actually follow the referral later when
 * we detect fsid mismatch in inode revalidation
 */
2184
static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
M
Manoj Naik 已提交
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
{
	int status = -ENOMEM;
	struct page *page = NULL;
	struct nfs4_fs_locations *locations = NULL;

	page = alloc_page(GFP_KERNEL);
	if (page == NULL)
		goto out;
	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
	if (locations == NULL)
		goto out;

2197
	status = nfs4_proc_fs_locations(dir, name, locations, page);
M
Manoj Naik 已提交
2198 2199 2200 2201
	if (status != 0)
		goto out;
	/* Make sure server returned a different fsid for the referral */
	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2202
		dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
M
Manoj Naik 已提交
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
		status = -EIO;
		goto out;
	}

	memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
	fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
	if (!fattr->mode)
		fattr->mode = S_IFDIR;
	memset(fhandle, 0, sizeof(struct nfs_fh));
out:
	if (page)
		__free_page(page);
2215
	kfree(locations);
M
Manoj Naik 已提交
2216 2217 2218
	return status;
}

L
Linus Torvalds 已提交
2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
	struct nfs4_getattr_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
	struct nfs4_getattr_res res = {
		.fattr = fattr,
		.server = server,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	
2235
	nfs_fattr_init(fattr);
A
Andy Adamson 已提交
2236
	return nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271
}

static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
				_nfs4_proc_getattr(server, fhandle, fattr),
				&exception);
	} while (exception.retry);
	return err;
}

/* 
 * The file is not closed if it is opened due to the a request to change
 * the size of the file. The open call will not be needed once the
 * VFS layer lookup-intents are implemented.
 *
 * Close is called when the inode is destroyed.
 * If we haven't opened the file for O_WRONLY, we
 * need to in the size_change case to obtain a stateid.
 *
 * Got race?
 * Because OPEN is always done by name in nfsv4, it is
 * possible that we opened a different file by the same
 * name.  We can recognize this race condition, but we
 * can't do anything about it besides returning an error.
 *
 * This will be fixed with VFS changes (lookup-intent).
 */
static int
nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
		  struct iattr *sattr)
{
2272
	struct inode *inode = dentry->d_inode;
2273
	struct rpc_cred *cred = NULL;
2274
	struct nfs4_state *state = NULL;
L
Linus Torvalds 已提交
2275 2276
	int status;

2277
	nfs_fattr_init(fattr);
L
Linus Torvalds 已提交
2278
	
2279
	/* Search for an existing open(O_WRITE) file */
2280 2281 2282 2283
	if (sattr->ia_valid & ATTR_FILE) {
		struct nfs_open_context *ctx;

		ctx = nfs_file_open_context(sattr->ia_file);
N
Neil Brown 已提交
2284 2285 2286 2287
		if (ctx) {
			cred = ctx->cred;
			state = ctx->state;
		}
2288
	}
2289

2290
	status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2291 2292
	if (status == 0)
		nfs_setattr_update_inode(inode, sattr);
L
Linus Torvalds 已提交
2293 2294 2295
	return status;
}

2296 2297
static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
		const struct qstr *name, struct nfs_fh *fhandle,
D
David Howells 已提交
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319
		struct nfs_fattr *fattr)
{
	int		       status;
	struct nfs4_lookup_arg args = {
		.bitmask = server->attr_bitmask,
		.dir_fh = dirfh,
		.name = name,
	};
	struct nfs4_lookup_res res = {
		.server = server,
		.fattr = fattr,
		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};

	nfs_fattr_init(fattr);

	dprintk("NFS call  lookupfh %s\n", name->name);
A
Andy Adamson 已提交
2320
	status = nfs4_call_sync(server, &msg, &args, &res, 0);
D
David Howells 已提交
2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331
	dprintk("NFS reply lookupfh: %d\n", status);
	return status;
}

static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
			      struct qstr *name, struct nfs_fh *fhandle,
			      struct nfs_fattr *fattr)
{
	struct nfs4_exception exception = { };
	int err;
	do {
2332 2333 2334 2335 2336 2337 2338
		err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
		/* FIXME: !!!! */
		if (err == -NFS4ERR_MOVED) {
			err = -EREMOTE;
			break;
		}
		err = nfs4_handle_exception(server, err, &exception);
D
David Howells 已提交
2339 2340 2341 2342
	} while (exception.retry);
	return err;
}

2343
static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
L
Linus Torvalds 已提交
2344 2345
		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
2346
	int status;
L
Linus Torvalds 已提交
2347 2348
	
	dprintk("NFS call  lookup %s\n", name->name);
2349
	status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
M
Manoj Naik 已提交
2350 2351
	if (status == -NFS4ERR_MOVED)
		status = nfs4_get_referral(dir, name, fattr, fhandle);
L
Linus Torvalds 已提交
2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
	dprintk("NFS reply lookup: %d\n", status);
	return status;
}

static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(dir),
				_nfs4_proc_lookup(dir, name, fhandle, fattr),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
2370
	struct nfs_server *server = NFS_SERVER(inode);
L
Linus Torvalds 已提交
2371 2372
	struct nfs4_accessargs args = {
		.fh = NFS_FH(inode),
2373 2374 2375 2376
		.bitmask = server->attr_bitmask,
	};
	struct nfs4_accessres res = {
		.server = server,
L
Linus Torvalds 已提交
2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = entry->cred,
	};
	int mode = entry->mask;
	int status;

	/*
	 * Determine which access bits we want to ask for...
	 */
	if (mode & MAY_READ)
		args.access |= NFS4_ACCESS_READ;
	if (S_ISDIR(inode->i_mode)) {
		if (mode & MAY_WRITE)
			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
		if (mode & MAY_EXEC)
			args.access |= NFS4_ACCESS_LOOKUP;
	} else {
		if (mode & MAY_WRITE)
			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
		if (mode & MAY_EXEC)
			args.access |= NFS4_ACCESS_EXECUTE;
	}
2403 2404 2405 2406 2407

	res.fattr = nfs_alloc_fattr();
	if (res.fattr == NULL)
		return -ENOMEM;

A
Andy Adamson 已提交
2408
	status = nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
2409 2410 2411 2412 2413 2414 2415 2416
	if (!status) {
		entry->mask = 0;
		if (res.access & NFS4_ACCESS_READ)
			entry->mask |= MAY_READ;
		if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
			entry->mask |= MAY_WRITE;
		if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
			entry->mask |= MAY_EXEC;
2417
		nfs_refresh_inode(inode, res.fattr);
L
Linus Torvalds 已提交
2418
	}
2419
	nfs_free_fattr(res.fattr);
L
Linus Torvalds 已提交
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467
	return status;
}

static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(inode),
				_nfs4_proc_access(inode, entry),
				&exception);
	} while (exception.retry);
	return err;
}

/*
 * TODO: For the time being, we don't try to get any attributes
 * along with any of the zero-copy operations READ, READDIR,
 * READLINK, WRITE.
 *
 * In the case of the first three, we want to put the GETATTR
 * after the read-type operation -- this is because it is hard
 * to predict the length of a GETATTR response in v4, and thus
 * align the READ data correctly.  This means that the GETATTR
 * may end up partially falling into the page cache, and we should
 * shift it into the 'tail' of the xdr_buf before processing.
 * To do this efficiently, we need to know the total length
 * of data received, which doesn't seem to be available outside
 * of the RPC layer.
 *
 * In the case of WRITE, we also want to put the GETATTR after
 * the operation -- in this case because we want to make sure
 * we get the post-operation mtime and size.  This means that
 * we can't use xdr_encode_pages() as written: we need a variant
 * of it which would leave room in the 'tail' iovec.
 *
 * Both of these changes to the XDR layer would in fact be quite
 * minor, but I decided to leave them for a subsequent patch.
 */
static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs4_readlink args = {
		.fh       = NFS_FH(inode),
		.pgbase	  = pgbase,
		.pglen    = pglen,
		.pages    = &page,
	};
B
Benny Halevy 已提交
2468
	struct nfs4_readlink_res res;
L
Linus Torvalds 已提交
2469 2470 2471
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
		.rpc_argp = &args,
B
Benny Halevy 已提交
2472
		.rpc_resp = &res,
L
Linus Torvalds 已提交
2473 2474
	};

A
Andy Adamson 已提交
2475
	return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
L
Linus Torvalds 已提交
2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507
}

static int nfs4_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(inode),
				_nfs4_proc_readlink(inode, page, pgbase, pglen),
				&exception);
	} while (exception.retry);
	return err;
}

/*
 * Got race?
 * We will need to arrange for the VFS layer to provide an atomic open.
 * Until then, this create/open method is prone to inefficiency and race
 * conditions due to the lookup, create, and open VFS calls from sys_open()
 * placed on the wire.
 *
 * Given the above sorry state of affairs, I'm simply sending an OPEN.
 * The file will be opened again in the subsequent VFS open call
 * (nfs4_proc_file_open).
 *
 * The open for read will just hang around to be used by any process that
 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
 */

static int
nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2508
                 int flags, struct nfs_open_context *ctx)
L
Linus Torvalds 已提交
2509
{
2510
	struct path my_path = {
2511 2512
		.dentry = dentry,
	};
2513
	struct path *path = &my_path;
L
Linus Torvalds 已提交
2514
	struct nfs4_state *state;
2515 2516
	struct rpc_cred *cred = NULL;
	fmode_t fmode = 0;
L
Linus Torvalds 已提交
2517 2518
	int status = 0;

2519 2520 2521 2522
	if (ctx != NULL) {
		cred = ctx->cred;
		path = &ctx->path;
		fmode = ctx->mode;
L
Linus Torvalds 已提交
2523
	}
A
Aneesh Kumar K.V 已提交
2524
	sattr->ia_mode &= ~current_umask();
2525
	state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2526
	d_drop(dentry);
L
Linus Torvalds 已提交
2527 2528
	if (IS_ERR(state)) {
		status = PTR_ERR(state);
2529
		goto out;
L
Linus Torvalds 已提交
2530
	}
2531
	d_add(dentry, igrab(state->inode));
2532
	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2533 2534
	if (ctx != NULL)
		ctx->state = state;
2535
	else
2536
		nfs4_close_sync(path, state, fmode);
L
Linus Torvalds 已提交
2537 2538 2539 2540 2541 2542
out:
	return status;
}

static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
2543
	struct nfs_server *server = NFS_SERVER(dir);
2544
	struct nfs_removeargs args = {
L
Linus Torvalds 已提交
2545
		.fh = NFS_FH(dir),
2546 2547
		.name.len = name->len,
		.name.name = name->name,
2548 2549
		.bitmask = server->attr_bitmask,
	};
2550
	struct nfs_removeres res = {
2551
		.server = server,
L
Linus Torvalds 已提交
2552 2553
	};
	struct rpc_message msg = {
2554 2555 2556
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
		.rpc_argp = &args,
		.rpc_resp = &res,
L
Linus Torvalds 已提交
2557
	};
2558 2559 2560 2561 2562
	int status = -ENOMEM;

	res.dir_attr = nfs_alloc_fattr();
	if (res.dir_attr == NULL)
		goto out;
L
Linus Torvalds 已提交
2563

A
Andy Adamson 已提交
2564
	status = nfs4_call_sync(server, &msg, &args, &res, 1);
2565 2566
	if (status == 0) {
		update_changeattr(dir, &res.cinfo);
2567
		nfs_post_op_update_inode(dir, res.dir_attr);
2568
	}
2569 2570
	nfs_free_fattr(res.dir_attr);
out:
L
Linus Torvalds 已提交
2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585
	return status;
}

static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(dir),
				_nfs4_proc_remove(dir, name),
				&exception);
	} while (exception.retry);
	return err;
}

2586
static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
L
Linus Torvalds 已提交
2587
{
2588 2589 2590
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_removeargs *args = msg->rpc_argp;
	struct nfs_removeres *res = msg->rpc_resp;
L
Linus Torvalds 已提交
2591

2592
	args->bitmask = server->cache_consistency_bitmask;
2593
	res->server = server;
2594
	res->seq_res.sr_slot = NULL;
L
Linus Torvalds 已提交
2595 2596 2597
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
}

2598
static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
L
Linus Torvalds 已提交
2599
{
2600 2601
	struct nfs_removeres *res = task->tk_msg.rpc_resp;

2602 2603
	if (!nfs4_sequence_done(task, &res->seq_res))
		return 0;
2604
	if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2605 2606
		return 0;
	update_changeattr(dir, &res->cinfo);
2607
	nfs_post_op_update_inode(dir, res->dir_attr);
2608
	return 1;
L
Linus Torvalds 已提交
2609 2610
}

2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638
static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
{
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_renameargs *arg = msg->rpc_argp;
	struct nfs_renameres *res = msg->rpc_resp;

	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
	arg->bitmask = server->attr_bitmask;
	res->server = server;
}

static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
				 struct inode *new_dir)
{
	struct nfs_renameres *res = task->tk_msg.rpc_resp;

	if (!nfs4_sequence_done(task, &res->seq_res))
		return 0;
	if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
		return 0;

	update_changeattr(old_dir, &res->old_cinfo);
	nfs_post_op_update_inode(old_dir, res->old_fattr);
	update_changeattr(new_dir, &res->new_cinfo);
	nfs_post_op_update_inode(new_dir, res->new_fattr);
	return 1;
}

L
Linus Torvalds 已提交
2639 2640 2641
static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
		struct inode *new_dir, struct qstr *new_name)
{
2642
	struct nfs_server *server = NFS_SERVER(old_dir);
2643
	struct nfs_renameargs arg = {
L
Linus Torvalds 已提交
2644 2645 2646 2647
		.old_dir = NFS_FH(old_dir),
		.new_dir = NFS_FH(new_dir),
		.old_name = old_name,
		.new_name = new_name,
2648 2649
		.bitmask = server->attr_bitmask,
	};
2650
	struct nfs_renameres res = {
2651
		.server = server,
L
Linus Torvalds 已提交
2652 2653 2654 2655 2656 2657
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
		.rpc_argp = &arg,
		.rpc_resp = &res,
	};
2658
	int status = -ENOMEM;
L
Linus Torvalds 已提交
2659
	
2660 2661 2662 2663
	res.old_fattr = nfs_alloc_fattr();
	res.new_fattr = nfs_alloc_fattr();
	if (res.old_fattr == NULL || res.new_fattr == NULL)
		goto out;
L
Linus Torvalds 已提交
2664

2665
	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
L
Linus Torvalds 已提交
2666 2667
	if (!status) {
		update_changeattr(old_dir, &res.old_cinfo);
2668
		nfs_post_op_update_inode(old_dir, res.old_fattr);
L
Linus Torvalds 已提交
2669
		update_changeattr(new_dir, &res.new_cinfo);
2670
		nfs_post_op_update_inode(new_dir, res.new_fattr);
L
Linus Torvalds 已提交
2671
	}
2672 2673 2674
out:
	nfs_free_fattr(res.new_fattr);
	nfs_free_fattr(res.old_fattr);
L
Linus Torvalds 已提交
2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
	return status;
}

static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
		struct inode *new_dir, struct qstr *new_name)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(old_dir),
				_nfs4_proc_rename(old_dir, old_name,
					new_dir, new_name),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
2694
	struct nfs_server *server = NFS_SERVER(inode);
L
Linus Torvalds 已提交
2695 2696 2697 2698
	struct nfs4_link_arg arg = {
		.fh     = NFS_FH(inode),
		.dir_fh = NFS_FH(dir),
		.name   = name,
2699 2700 2701 2702
		.bitmask = server->attr_bitmask,
	};
	struct nfs4_link_res res = {
		.server = server,
L
Linus Torvalds 已提交
2703 2704 2705 2706
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
		.rpc_argp = &arg,
2707
		.rpc_resp = &res,
L
Linus Torvalds 已提交
2708
	};
2709 2710 2711 2712 2713 2714
	int status = -ENOMEM;

	res.fattr = nfs_alloc_fattr();
	res.dir_attr = nfs_alloc_fattr();
	if (res.fattr == NULL || res.dir_attr == NULL)
		goto out;
L
Linus Torvalds 已提交
2715

A
Andy Adamson 已提交
2716
	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2717 2718 2719
	if (!status) {
		update_changeattr(dir, &res.cinfo);
		nfs_post_op_update_inode(dir, res.dir_attr);
2720
		nfs_post_op_update_inode(inode, res.fattr);
2721
	}
2722 2723 2724
out:
	nfs_free_fattr(res.dir_attr);
	nfs_free_fattr(res.fattr);
L
Linus Torvalds 已提交
2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
	return status;
}

static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(inode),
				_nfs4_proc_link(inode, dir, name),
				&exception);
	} while (exception.retry);
	return err;
}

2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778
struct nfs4_createdata {
	struct rpc_message msg;
	struct nfs4_create_arg arg;
	struct nfs4_create_res res;
	struct nfs_fh fh;
	struct nfs_fattr fattr;
	struct nfs_fattr dir_fattr;
};

static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
		struct qstr *name, struct iattr *sattr, u32 ftype)
{
	struct nfs4_createdata *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data != NULL) {
		struct nfs_server *server = NFS_SERVER(dir);

		data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
		data->msg.rpc_argp = &data->arg;
		data->msg.rpc_resp = &data->res;
		data->arg.dir_fh = NFS_FH(dir);
		data->arg.server = server;
		data->arg.name = name;
		data->arg.attrs = sattr;
		data->arg.ftype = ftype;
		data->arg.bitmask = server->attr_bitmask;
		data->res.server = server;
		data->res.fh = &data->fh;
		data->res.fattr = &data->fattr;
		data->res.dir_fattr = &data->dir_fattr;
		nfs_fattr_init(data->res.fattr);
		nfs_fattr_init(data->res.dir_fattr);
	}
	return data;
}

static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
{
A
Andy Adamson 已提交
2779 2780
	int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
				    &data->arg, &data->res, 1);
2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793
	if (status == 0) {
		update_changeattr(dir, &data->res.dir_cinfo);
		nfs_post_op_update_inode(dir, data->res.dir_fattr);
		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
	}
	return status;
}

static void nfs4_free_createdata(struct nfs4_createdata *data)
{
	kfree(data);
}

2794
static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2795
		struct page *page, unsigned int len, struct iattr *sattr)
L
Linus Torvalds 已提交
2796
{
2797 2798
	struct nfs4_createdata *data;
	int status = -ENAMETOOLONG;
L
Linus Torvalds 已提交
2799

2800
	if (len > NFS4_MAXPATHLEN)
2801
		goto out;
2802

2803 2804 2805 2806 2807 2808 2809 2810
	status = -ENOMEM;
	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
	if (data == NULL)
		goto out;

	data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
	data->arg.u.symlink.pages = &page;
	data->arg.u.symlink.len = len;
L
Linus Torvalds 已提交
2811
	
2812 2813 2814 2815
	status = nfs4_do_create(dir, dentry, data);

	nfs4_free_createdata(data);
out:
L
Linus Torvalds 已提交
2816 2817 2818
	return status;
}

2819
static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2820
		struct page *page, unsigned int len, struct iattr *sattr)
L
Linus Torvalds 已提交
2821 2822 2823 2824 2825
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(dir),
2826 2827
				_nfs4_proc_symlink(dir, dentry, page,
							len, sattr),
L
Linus Torvalds 已提交
2828 2829 2830 2831 2832 2833 2834 2835
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
		struct iattr *sattr)
{
2836 2837
	struct nfs4_createdata *data;
	int status = -ENOMEM;
L
Linus Torvalds 已提交
2838

2839 2840 2841 2842 2843 2844 2845 2846
	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
	if (data == NULL)
		goto out;

	status = nfs4_do_create(dir, dentry, data);

	nfs4_free_createdata(data);
out:
L
Linus Torvalds 已提交
2847 2848 2849 2850 2851 2852 2853 2854
	return status;
}

static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
		struct iattr *sattr)
{
	struct nfs4_exception exception = { };
	int err;
A
Aneesh Kumar K.V 已提交
2855 2856

	sattr->ia_mode &= ~current_umask();
L
Linus Torvalds 已提交
2857 2858 2859 2860 2861 2862 2863 2864 2865
	do {
		err = nfs4_handle_exception(NFS_SERVER(dir),
				_nfs4_proc_mkdir(dir, dentry, sattr),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
B
Bryan Schumaker 已提交
2866
		u64 cookie, struct page **pages, unsigned int count, int plus)
L
Linus Torvalds 已提交
2867 2868 2869 2870
{
	struct inode		*dir = dentry->d_inode;
	struct nfs4_readdir_arg args = {
		.fh = NFS_FH(dir),
B
Bryan Schumaker 已提交
2871
		.pages = pages,
L
Linus Torvalds 已提交
2872 2873
		.pgbase = 0,
		.count = count,
2874
		.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
B
Bryan Schumaker 已提交
2875
		.plus = plus,
L
Linus Torvalds 已提交
2876 2877 2878 2879 2880 2881 2882 2883 2884 2885
	};
	struct nfs4_readdir_res res;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = cred,
	};
	int			status;

2886
	dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2887 2888 2889
			dentry->d_parent->d_name.name,
			dentry->d_name.name,
			(unsigned long long)cookie);
L
Linus Torvalds 已提交
2890 2891
	nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
	res.pgbase = args.pgbase;
A
Andy Adamson 已提交
2892
	status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2893
	if (status >= 0) {
L
Linus Torvalds 已提交
2894
		memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2895 2896
		status += args.pgbase;
	}
2897 2898 2899

	nfs_invalidate_atime(dir);

2900
	dprintk("%s: returns %d\n", __func__, status);
L
Linus Torvalds 已提交
2901 2902 2903 2904
	return status;
}

static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
B
Bryan Schumaker 已提交
2905
		u64 cookie, struct page **pages, unsigned int count, int plus)
L
Linus Torvalds 已提交
2906 2907 2908 2909 2910 2911
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
				_nfs4_proc_readdir(dentry, cred, cookie,
B
Bryan Schumaker 已提交
2912
					pages, count, plus),
L
Linus Torvalds 已提交
2913 2914 2915 2916 2917 2918 2919 2920
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
		struct iattr *sattr, dev_t rdev)
{
2921 2922 2923
	struct nfs4_createdata *data;
	int mode = sattr->ia_mode;
	int status = -ENOMEM;
L
Linus Torvalds 已提交
2924 2925 2926

	BUG_ON(!(sattr->ia_valid & ATTR_MODE));
	BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2927 2928 2929 2930 2931

	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
	if (data == NULL)
		goto out;

L
Linus Torvalds 已提交
2932
	if (S_ISFIFO(mode))
2933
		data->arg.ftype = NF4FIFO;
L
Linus Torvalds 已提交
2934
	else if (S_ISBLK(mode)) {
2935 2936 2937
		data->arg.ftype = NF4BLK;
		data->arg.u.device.specdata1 = MAJOR(rdev);
		data->arg.u.device.specdata2 = MINOR(rdev);
L
Linus Torvalds 已提交
2938 2939
	}
	else if (S_ISCHR(mode)) {
2940 2941 2942
		data->arg.ftype = NF4CHR;
		data->arg.u.device.specdata1 = MAJOR(rdev);
		data->arg.u.device.specdata2 = MINOR(rdev);
L
Linus Torvalds 已提交
2943 2944
	}
	
2945 2946 2947 2948
	status = nfs4_do_create(dir, dentry, data);

	nfs4_free_createdata(data);
out:
L
Linus Torvalds 已提交
2949 2950 2951 2952 2953 2954 2955 2956
	return status;
}

static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
		struct iattr *sattr, dev_t rdev)
{
	struct nfs4_exception exception = { };
	int err;
A
Aneesh Kumar K.V 已提交
2957 2958

	sattr->ia_mode &= ~current_umask();
L
Linus Torvalds 已提交
2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
	do {
		err = nfs4_handle_exception(NFS_SERVER(dir),
				_nfs4_proc_mknod(dir, dentry, sattr, rdev),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
		 struct nfs_fsstat *fsstat)
{
	struct nfs4_statfs_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
B
Benny Halevy 已提交
2974 2975 2976
	struct nfs4_statfs_res res = {
		.fsstat = fsstat,
	};
L
Linus Torvalds 已提交
2977 2978 2979
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
		.rpc_argp = &args,
B
Benny Halevy 已提交
2980
		.rpc_resp = &res,
L
Linus Torvalds 已提交
2981 2982
	};

2983
	nfs_fattr_init(fsstat->fattr);
A
Andy Adamson 已提交
2984
	return  nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005
}

static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(server,
				_nfs4_proc_statfs(server, fhandle, fsstat),
				&exception);
	} while (exception.retry);
	return err;
}

static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *fsinfo)
{
	struct nfs4_fsinfo_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
B
Benny Halevy 已提交
3006 3007 3008
	struct nfs4_fsinfo_res res = {
		.fsinfo = fsinfo,
	};
L
Linus Torvalds 已提交
3009 3010 3011
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
		.rpc_argp = &args,
B
Benny Halevy 已提交
3012
		.rpc_resp = &res,
L
Linus Torvalds 已提交
3013 3014
	};

A
Andy Adamson 已提交
3015
	return nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032
}

static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
	struct nfs4_exception exception = { };
	int err;

	do {
		err = nfs4_handle_exception(server,
				_nfs4_do_fsinfo(server, fhandle, fsinfo),
				&exception);
	} while (exception.retry);
	return err;
}

static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
3033
	nfs_fattr_init(fsinfo->fattr);
L
Linus Torvalds 已提交
3034 3035 3036 3037 3038 3039 3040 3041 3042 3043
	return nfs4_do_fsinfo(server, fhandle, fsinfo);
}

static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_pathconf *pathconf)
{
	struct nfs4_pathconf_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
B
Benny Halevy 已提交
3044 3045 3046
	struct nfs4_pathconf_res res = {
		.pathconf = pathconf,
	};
L
Linus Torvalds 已提交
3047 3048 3049
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
		.rpc_argp = &args,
B
Benny Halevy 已提交
3050
		.rpc_resp = &res,
L
Linus Torvalds 已提交
3051 3052 3053 3054 3055 3056 3057 3058
	};

	/* None of the pathconf attributes are mandatory to implement */
	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
		memset(pathconf, 0, sizeof(*pathconf));
		return 0;
	}

3059
	nfs_fattr_init(pathconf->fattr);
A
Andy Adamson 已提交
3060
	return nfs4_call_sync(server, &msg, &args, &res, 0);
L
Linus Torvalds 已提交
3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076
}

static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_pathconf *pathconf)
{
	struct nfs4_exception exception = { };
	int err;

	do {
		err = nfs4_handle_exception(server,
				_nfs4_proc_pathconf(server, fhandle, pathconf),
				&exception);
	} while (exception.retry);
	return err;
}

3077
static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
L
Linus Torvalds 已提交
3078
{
T
Trond Myklebust 已提交
3079
	struct nfs_server *server = NFS_SERVER(data->inode);
L
Linus Torvalds 已提交
3080

3081
	if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3082
		nfs_restart_rpc(task, server->nfs_client);
T
Trond Myklebust 已提交
3083
		return -EAGAIN;
L
Linus Torvalds 已提交
3084
	}
3085 3086

	nfs_invalidate_atime(data->inode);
L
Linus Torvalds 已提交
3087
	if (task->tk_status > 0)
T
Trond Myklebust 已提交
3088 3089
		renew_lease(server, data->timestamp);
	return 0;
L
Linus Torvalds 已提交
3090 3091
}

3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102
static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
{

	dprintk("--> %s\n", __func__);

	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return -EAGAIN;

	return data->read_done_cb(task, data);
}

3103
static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
L
Linus Torvalds 已提交
3104 3105
{
	data->timestamp   = jiffies;
3106
	data->read_done_cb = nfs4_read_done_cb;
3107
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
L
Linus Torvalds 已提交
3108 3109
}

3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125
/* Reset the the nfs_read_data to send the read to the MDS. */
void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
{
	dprintk("%s Reset task for i/o through\n", __func__);
	put_lseg(data->lseg);
	data->lseg = NULL;
	/* offsets will differ in the dense stripe case */
	data->args.offset = data->mds_offset;
	data->ds_clp = NULL;
	data->args.fh     = NFS_FH(data->inode);
	data->read_done_cb = nfs4_read_done_cb;
	task->tk_ops = data->mds_ops;
	rpc_task_reset_client(task, NFS_CLIENT(data->inode));
}
EXPORT_SYMBOL_GPL(nfs4_reset_read);

3126
static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
L
Linus Torvalds 已提交
3127 3128 3129
{
	struct inode *inode = data->inode;
	
3130 3131
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return -EAGAIN;
3132

3133
	if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3134
		nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3135
		return -EAGAIN;
L
Linus Torvalds 已提交
3136
	}
3137
	if (task->tk_status >= 0) {
L
Linus Torvalds 已提交
3138
		renew_lease(NFS_SERVER(inode), data->timestamp);
3139
		nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3140
	}
3141
	return 0;
L
Linus Torvalds 已提交
3142 3143
}

3144
static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
L
Linus Torvalds 已提交
3145
{
3146 3147
	struct nfs_server *server = NFS_SERVER(data->inode);

3148
	data->args.bitmask = server->cache_consistency_bitmask;
3149
	data->res.server = server;
L
Linus Torvalds 已提交
3150 3151
	data->timestamp   = jiffies;

3152
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
L
Linus Torvalds 已提交
3153 3154
}

3155
static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
L
Linus Torvalds 已提交
3156 3157 3158
{
	struct inode *inode = data->inode;
	
3159 3160 3161
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return -EAGAIN;

3162
	if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3163
		nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3164
		return -EAGAIN;
L
Linus Torvalds 已提交
3165
	}
3166
	nfs_refresh_inode(inode, data->res.fattr);
3167
	return 0;
L
Linus Torvalds 已提交
3168 3169
}

3170
static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
L
Linus Torvalds 已提交
3171
{
3172
	struct nfs_server *server = NFS_SERVER(data->inode);
L
Linus Torvalds 已提交
3173
	
3174
	data->args.bitmask = server->cache_consistency_bitmask;
3175
	data->res.server = server;
3176
	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
L
Linus Torvalds 已提交
3177 3178
}

3179 3180 3181 3182 3183
struct nfs4_renewdata {
	struct nfs_client	*client;
	unsigned long		timestamp;
};

L
Linus Torvalds 已提交
3184 3185 3186 3187
/*
 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
 * standalone procedure for queueing an asynchronous RENEW.
 */
3188
static void nfs4_renew_release(void *calldata)
3189
{
3190 3191
	struct nfs4_renewdata *data = calldata;
	struct nfs_client *clp = data->client;
3192

3193 3194 3195
	if (atomic_read(&clp->cl_count) > 1)
		nfs4_schedule_state_renewal(clp);
	nfs_put_client(clp);
3196
	kfree(data);
3197 3198
}

3199
static void nfs4_renew_done(struct rpc_task *task, void *calldata)
L
Linus Torvalds 已提交
3200
{
3201 3202 3203
	struct nfs4_renewdata *data = calldata;
	struct nfs_client *clp = data->client;
	unsigned long timestamp = data->timestamp;
L
Linus Torvalds 已提交
3204 3205

	if (task->tk_status < 0) {
3206 3207
		/* Unless we're shutting down, schedule state recovery! */
		if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3208
			nfs4_schedule_lease_recovery(clp);
L
Linus Torvalds 已提交
3209 3210
		return;
	}
3211
	do_renew_lease(clp, timestamp);
L
Linus Torvalds 已提交
3212 3213
}

3214 3215
static const struct rpc_call_ops nfs4_renew_ops = {
	.rpc_call_done = nfs4_renew_done,
3216
	.rpc_release = nfs4_renew_release,
3217 3218
};

3219
int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
L
Linus Torvalds 已提交
3220 3221 3222 3223
{
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
		.rpc_argp	= clp,
3224
		.rpc_cred	= cred,
L
Linus Torvalds 已提交
3225
	};
3226
	struct nfs4_renewdata *data;
L
Linus Torvalds 已提交
3227

3228 3229
	if (!atomic_inc_not_zero(&clp->cl_count))
		return -EIO;
3230 3231 3232 3233 3234
	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;
	data->client = clp;
	data->timestamp = jiffies;
L
Linus Torvalds 已提交
3235
	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3236
			&nfs4_renew_ops, data);
L
Linus Torvalds 已提交
3237 3238
}

3239
int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
L
Linus Torvalds 已提交
3240 3241 3242 3243
{
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
		.rpc_argp	= clp,
3244
		.rpc_cred	= cred,
L
Linus Torvalds 已提交
3245 3246 3247 3248 3249 3250 3251
	};
	unsigned long now = jiffies;
	int status;

	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
	if (status < 0)
		return status;
3252
	do_renew_lease(clp, now);
L
Linus Torvalds 已提交
3253 3254 3255
	return 0;
}

3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281
static inline int nfs4_server_supports_acls(struct nfs_server *server)
{
	return (server->caps & NFS_CAP_ACLS)
		&& (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
		&& (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
}

/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
 * the stack.
 */
#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)

static void buf_to_pages(const void *buf, size_t buflen,
		struct page **pages, unsigned int *pgbase)
{
	const void *p = buf;

	*pgbase = offset_in_page(buf);
	p -= *pgbase;
	while (p < buf + buflen) {
		*(pages++) = virt_to_page(p);
		p += PAGE_CACHE_SIZE;
	}
}

3282 3283 3284 3285 3286 3287 3288 3289 3290
static int buf_to_pages_noslab(const void *buf, size_t buflen,
		struct page **pages, unsigned int *pgbase)
{
	struct page *newpage, **spages;
	int rc = 0;
	size_t len;
	spages = pages;

	do {
J
Jovi Zhang 已提交
3291
		len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310
		newpage = alloc_page(GFP_KERNEL);

		if (newpage == NULL)
			goto unwind;
		memcpy(page_address(newpage), buf, len);
                buf += len;
                buflen -= len;
		*pages++ = newpage;
		rc++;
	} while (buflen != 0);

	return rc;

unwind:
	for(; rc > 0; rc--)
		__free_page(spages[rc-1]);
	return -ENOMEM;
}

3311 3312 3313
struct nfs4_cached_acl {
	int cached;
	size_t len;
A
Andrew Morton 已提交
3314
	char data[0];
3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377
};

static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	kfree(nfsi->nfs4_acl);
	nfsi->nfs4_acl = acl;
	spin_unlock(&inode->i_lock);
}

static void nfs4_zap_acl_attr(struct inode *inode)
{
	nfs4_set_cached_acl(inode, NULL);
}

static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs4_cached_acl *acl;
	int ret = -ENOENT;

	spin_lock(&inode->i_lock);
	acl = nfsi->nfs4_acl;
	if (acl == NULL)
		goto out;
	if (buf == NULL) /* user is just asking for length */
		goto out_len;
	if (acl->cached == 0)
		goto out;
	ret = -ERANGE; /* see getxattr(2) man page */
	if (acl->len > buflen)
		goto out;
	memcpy(buf, acl->data, acl->len);
out_len:
	ret = acl->len;
out:
	spin_unlock(&inode->i_lock);
	return ret;
}

static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
{
	struct nfs4_cached_acl *acl;

	if (buf && acl_len <= PAGE_SIZE) {
		acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
		if (acl == NULL)
			goto out;
		acl->cached = 1;
		memcpy(acl->data, buf, acl_len);
	} else {
		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
		if (acl == NULL)
			goto out;
		acl->cached = 0;
	}
	acl->len = acl_len;
out:
	nfs4_set_cached_acl(inode, acl);
}

3378
static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3379 3380 3381 3382 3383 3384 3385
{
	struct page *pages[NFS4ACL_MAXPAGES];
	struct nfs_getaclargs args = {
		.fh = NFS_FH(inode),
		.acl_pages = pages,
		.acl_len = buflen,
	};
B
Benny Halevy 已提交
3386 3387 3388
	struct nfs_getaclres res = {
		.acl_len = buflen,
	};
3389
	void *resp_buf;
3390 3391 3392
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
		.rpc_argp = &args,
B
Benny Halevy 已提交
3393
		.rpc_resp = &res,
3394
	};
3395
	struct page *localpage = NULL;
3396 3397
	int ret;

3398 3399 3400 3401 3402 3403 3404 3405 3406
	if (buflen < PAGE_SIZE) {
		/* As long as we're doing a round trip to the server anyway,
		 * let's be prepared for a page of acl data. */
		localpage = alloc_page(GFP_KERNEL);
		resp_buf = page_address(localpage);
		if (localpage == NULL)
			return -ENOMEM;
		args.acl_pages[0] = localpage;
		args.acl_pgbase = 0;
B
Benny Halevy 已提交
3407
		args.acl_len = PAGE_SIZE;
3408 3409 3410 3411
	} else {
		resp_buf = buf;
		buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
	}
A
Andy Adamson 已提交
3412
	ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3413 3414
	if (ret)
		goto out_free;
B
Benny Halevy 已提交
3415 3416
	if (res.acl_len > args.acl_len)
		nfs4_write_cached_acl(inode, NULL, res.acl_len);
3417
	else
B
Benny Halevy 已提交
3418
		nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3419 3420
	if (buf) {
		ret = -ERANGE;
B
Benny Halevy 已提交
3421
		if (res.acl_len > buflen)
3422 3423
			goto out_free;
		if (localpage)
B
Benny Halevy 已提交
3424
			memcpy(buf, resp_buf, res.acl_len);
3425
	}
B
Benny Halevy 已提交
3426
	ret = res.acl_len;
3427 3428 3429
out_free:
	if (localpage)
		__free_page(localpage);
3430 3431 3432
	return ret;
}

3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445
static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
{
	struct nfs4_exception exception = { };
	ssize_t ret;
	do {
		ret = __nfs4_get_acl_uncached(inode, buf, buflen);
		if (ret >= 0)
			break;
		ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
	} while (exception.retry);
	return ret;
}

3446 3447 3448 3449 3450 3451 3452 3453 3454 3455
static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
{
	struct nfs_server *server = NFS_SERVER(inode);
	int ret;

	if (!nfs4_server_supports_acls(server))
		return -EOPNOTSUPP;
	ret = nfs_revalidate_inode(server, inode);
	if (ret < 0)
		return ret;
3456 3457
	if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
		nfs_zap_acl_cache(inode);
3458 3459 3460 3461 3462 3463
	ret = nfs4_read_cached_acl(inode, buf, buflen);
	if (ret != -ENOENT)
		return ret;
	return nfs4_get_acl_uncached(inode, buf, buflen);
}

3464
static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3465 3466 3467 3468 3469 3470 3471 3472
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct page *pages[NFS4ACL_MAXPAGES];
	struct nfs_setaclargs arg = {
		.fh		= NFS_FH(inode),
		.acl_pages	= pages,
		.acl_len	= buflen,
	};
B
Benny Halevy 已提交
3473
	struct nfs_setaclres res;
3474 3475 3476
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETACL],
		.rpc_argp	= &arg,
B
Benny Halevy 已提交
3477
		.rpc_resp	= &res,
3478
	};
3479
	int ret, i;
3480 3481 3482

	if (!nfs4_server_supports_acls(server))
		return -EOPNOTSUPP;
3483 3484 3485
	i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
	if (i < 0)
		return i;
3486
	nfs_inode_return_delegation(inode);
A
Andy Adamson 已提交
3487
	ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3488 3489 3490 3491 3492 3493 3494 3495

	/*
	 * Free each page after tx, so the only ref left is
	 * held by the network stack
	 */
	for (; i > 0; i--)
		put_page(pages[i-1]);

3496 3497 3498 3499 3500 3501 3502
	/*
	 * Acl update can result in inode attribute update.
	 * so mark the attribute cache invalid.
	 */
	spin_lock(&inode->i_lock);
	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
	spin_unlock(&inode->i_lock);
3503 3504
	nfs_access_zap_cache(inode);
	nfs_zap_acl_cache(inode);
3505 3506 3507
	return ret;
}

3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519
static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
{
	struct nfs4_exception exception = { };
	int err;
	do {
		err = nfs4_handle_exception(NFS_SERVER(inode),
				__nfs4_proc_set_acl(inode, buf, buflen),
				&exception);
	} while (exception.retry);
	return err;
}

L
Linus Torvalds 已提交
3520
static int
3521
nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
L
Linus Torvalds 已提交
3522
{
3523 3524 3525
	struct nfs_client *clp = server->nfs_client;

	if (task->tk_status >= 0)
L
Linus Torvalds 已提交
3526 3527
		return 0;
	switch(task->tk_status) {
3528 3529 3530 3531 3532
		case -NFS4ERR_ADMIN_REVOKED:
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_OPENMODE:
			if (state == NULL)
				break;
3533 3534
			nfs4_schedule_stateid_recovery(server, state);
			goto wait_on_recovery;
L
Linus Torvalds 已提交
3535
		case -NFS4ERR_STALE_STATEID:
3536
		case -NFS4ERR_STALE_CLIENTID:
L
Linus Torvalds 已提交
3537
		case -NFS4ERR_EXPIRED:
3538 3539
			nfs4_schedule_lease_recovery(clp);
			goto wait_on_recovery;
3540 3541 3542 3543 3544 3545 3546 3547 3548 3549
#if defined(CONFIG_NFS_V4_1)
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
			dprintk("%s ERROR %d, Reset session\n", __func__,
				task->tk_status);
3550
			nfs4_schedule_session_recovery(clp->cl_session);
3551 3552 3553
			task->tk_status = 0;
			return -EAGAIN;
#endif /* CONFIG_NFS_V4_1 */
L
Linus Torvalds 已提交
3554
		case -NFS4ERR_DELAY:
3555
			nfs_inc_server_stats(server, NFSIOS_DELAY);
3556
		case -NFS4ERR_GRACE:
3557
		case -EKEYEXPIRED:
L
Linus Torvalds 已提交
3558 3559 3560 3561 3562 3563 3564 3565 3566
			rpc_delay(task, NFS4_POLL_RETRY_MAX);
			task->tk_status = 0;
			return -EAGAIN;
		case -NFS4ERR_OLD_STATEID:
			task->tk_status = 0;
			return -EAGAIN;
	}
	task->tk_status = nfs4_map_errors(task->tk_status);
	return 0;
3567
wait_on_recovery:
3568 3569 3570 3571 3572
	rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
	if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
		rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
	task->tk_status = 0;
	return -EAGAIN;
L
Linus Torvalds 已提交
3573 3574
}

3575 3576 3577
int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
		unsigned short port, struct rpc_cred *cred,
		struct nfs4_setclientid_res *res)
L
Linus Torvalds 已提交
3578 3579 3580 3581 3582
{
	nfs4_verifier sc_verifier;
	struct nfs4_setclientid setclientid = {
		.sc_verifier = &sc_verifier,
		.sc_prog = program,
A
Andy Adamson 已提交
3583
		.sc_cb_ident = clp->cl_cb_ident,
L
Linus Torvalds 已提交
3584 3585 3586 3587
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
		.rpc_argp = &setclientid,
3588
		.rpc_resp = res,
3589
		.rpc_cred = cred,
L
Linus Torvalds 已提交
3590
	};
A
Al Viro 已提交
3591
	__be32 *p;
L
Linus Torvalds 已提交
3592 3593 3594
	int loop = 0;
	int status;

A
Al Viro 已提交
3595
	p = (__be32*)sc_verifier.data;
L
Linus Torvalds 已提交
3596 3597 3598 3599 3600
	*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
	*p = htonl((u32)clp->cl_boot_time.tv_nsec);

	for(;;) {
		setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3601
				sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3602 3603 3604
				clp->cl_ipaddr,
				rpc_peeraddr2str(clp->cl_rpcclient,
							RPC_DISPLAY_ADDR),
3605 3606
				rpc_peeraddr2str(clp->cl_rpcclient,
							RPC_DISPLAY_PROTO),
3607
				clp->cl_rpcclient->cl_auth->au_ops->au_name,
L
Linus Torvalds 已提交
3608 3609
				clp->cl_id_uniquifier);
		setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3610 3611 3612
				sizeof(setclientid.sc_netid),
				rpc_peeraddr2str(clp->cl_rpcclient,
							RPC_DISPLAY_NETID));
L
Linus Torvalds 已提交
3613
		setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3614
				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
L
Linus Torvalds 已提交
3615 3616 3617 3618 3619 3620 3621 3622
				clp->cl_ipaddr, port >> 8, port & 255);

		status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
		if (status != -NFS4ERR_CLID_INUSE)
			break;
		if (signalled())
			break;
		if (loop++ & 1)
3623
			ssleep(clp->cl_lease_time / HZ + 1);
L
Linus Torvalds 已提交
3624 3625 3626 3627 3628 3629 3630
		else
			if (++clp->cl_id_uniquifier == 0)
				break;
	}
	return status;
}

3631 3632 3633
static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
		struct nfs4_setclientid_res *arg,
		struct rpc_cred *cred)
L
Linus Torvalds 已提交
3634 3635 3636 3637
{
	struct nfs_fsinfo fsinfo;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3638
		.rpc_argp = arg,
L
Linus Torvalds 已提交
3639
		.rpc_resp = &fsinfo,
3640
		.rpc_cred = cred,
L
Linus Torvalds 已提交
3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655
	};
	unsigned long now;
	int status;

	now = jiffies;
	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
	if (status == 0) {
		spin_lock(&clp->cl_lock);
		clp->cl_lease_time = fsinfo.lease_time * HZ;
		clp->cl_last_renewal = now;
		spin_unlock(&clp->cl_lock);
	}
	return status;
}

3656 3657 3658
int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
		struct nfs4_setclientid_res *arg,
		struct rpc_cred *cred)
3659
{
3660
	long timeout = 0;
3661 3662
	int err;
	do {
3663
		err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675
		switch (err) {
			case 0:
				return err;
			case -NFS4ERR_RESOURCE:
				/* The IBM lawyers misread another document! */
			case -NFS4ERR_DELAY:
				err = nfs4_delay(clp->cl_rpcclient, &timeout);
		}
	} while (err == 0);
	return err;
}

3676 3677
struct nfs4_delegreturndata {
	struct nfs4_delegreturnargs args;
3678
	struct nfs4_delegreturnres res;
3679 3680
	struct nfs_fh fh;
	nfs4_stateid stateid;
3681
	unsigned long timestamp;
3682
	struct nfs_fattr fattr;
3683 3684 3685 3686 3687 3688
	int rpc_status;
};

static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_delegreturndata *data = calldata;
3689

3690 3691
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return;
3692

3693 3694 3695 3696
	switch (task->tk_status) {
	case -NFS4ERR_STALE_STATEID:
	case -NFS4ERR_EXPIRED:
	case 0:
3697
		renew_lease(data->res.server, data->timestamp);
3698 3699 3700 3701 3702 3703 3704 3705 3706
		break;
	default:
		if (nfs4_async_handle_error(task, data->res.server, NULL) ==
				-EAGAIN) {
			nfs_restart_rpc(task, data->res.server->nfs_client);
			return;
		}
	}
	data->rpc_status = task->tk_status;
3707 3708 3709 3710 3711 3712 3713
}

static void nfs4_delegreturn_release(void *calldata)
{
	kfree(calldata);
}

3714 3715 3716 3717 3718 3719 3720
#if defined(CONFIG_NFS_V4_1)
static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
{
	struct nfs4_delegreturndata *d_data;

	d_data = (struct nfs4_delegreturndata *)data;

3721
	if (nfs4_setup_sequence(d_data->res.server,
3722 3723 3724 3725 3726 3727 3728
				&d_data->args.seq_args,
				&d_data->res.seq_res, 1, task))
		return;
	rpc_call_start(task);
}
#endif /* CONFIG_NFS_V4_1 */

3729
static const struct rpc_call_ops nfs4_delegreturn_ops = {
3730 3731 3732
#if defined(CONFIG_NFS_V4_1)
	.rpc_call_prepare = nfs4_delegreturn_prepare,
#endif /* CONFIG_NFS_V4_1 */
3733 3734 3735 3736
	.rpc_call_done = nfs4_delegreturn_done,
	.rpc_release = nfs4_delegreturn_release,
};

3737
static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3738 3739
{
	struct nfs4_delegreturndata *data;
3740
	struct nfs_server *server = NFS_SERVER(inode);
3741
	struct rpc_task *task;
3742 3743 3744 3745
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
		.rpc_cred = cred,
	};
T
Trond Myklebust 已提交
3746 3747
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
3748
		.rpc_message = &msg,
T
Trond Myklebust 已提交
3749 3750 3751
		.callback_ops = &nfs4_delegreturn_ops,
		.flags = RPC_TASK_ASYNC,
	};
3752
	int status = 0;
3753

3754
	data = kzalloc(sizeof(*data), GFP_NOFS);
3755 3756 3757 3758
	if (data == NULL)
		return -ENOMEM;
	data->args.fhandle = &data->fh;
	data->args.stateid = &data->stateid;
3759
	data->args.bitmask = server->attr_bitmask;
3760 3761
	nfs_copy_fh(&data->fh, NFS_FH(inode));
	memcpy(&data->stateid, stateid, sizeof(data->stateid));
3762 3763
	data->res.fattr = &data->fattr;
	data->res.server = server;
3764
	nfs_fattr_init(data->res.fattr);
3765
	data->timestamp = jiffies;
3766 3767
	data->rpc_status = 0;

T
Trond Myklebust 已提交
3768
	task_setup_data.callback_data = data;
3769 3770
	msg.rpc_argp = &data->args;
	msg.rpc_resp = &data->res;
T
Trond Myklebust 已提交
3771
	task = rpc_run_task(&task_setup_data);
3772
	if (IS_ERR(task))
3773
		return PTR_ERR(task);
3774 3775
	if (!issync)
		goto out;
3776
	status = nfs4_wait_for_completion_rpc_task(task);
3777 3778 3779 3780 3781 3782 3783
	if (status != 0)
		goto out;
	status = data->rpc_status;
	if (status != 0)
		goto out;
	nfs_refresh_inode(inode, &data->fattr);
out:
3784
	rpc_put_task(task);
3785
	return status;
L
Linus Torvalds 已提交
3786 3787
}

3788
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
L
Linus Torvalds 已提交
3789 3790 3791 3792 3793
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs4_exception exception = { };
	int err;
	do {
3794
		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
L
Linus Torvalds 已提交
3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814
		switch (err) {
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_EXPIRED:
			case 0:
				return 0;
		}
		err = nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
	return err;
}

#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)

/* 
 * sleep, with exponential backoff, and retry the LOCK operation. 
 */
static unsigned long
nfs4_set_lock_task_retry(unsigned long timeout)
{
3815
	schedule_timeout_killable(timeout);
L
Linus Torvalds 已提交
3816 3817 3818 3819 3820 3821 3822 3823 3824 3825
	timeout <<= 1;
	if (timeout > NFS4_LOCK_MAXTIMEOUT)
		return NFS4_LOCK_MAXTIMEOUT;
	return timeout;
}

static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
	struct inode *inode = state->inode;
	struct nfs_server *server = NFS_SERVER(inode);
3826
	struct nfs_client *clp = server->nfs_client;
T
Trond Myklebust 已提交
3827
	struct nfs_lockt_args arg = {
L
Linus Torvalds 已提交
3828
		.fh = NFS_FH(inode),
T
Trond Myklebust 已提交
3829
		.fl = request,
L
Linus Torvalds 已提交
3830
	};
T
Trond Myklebust 已提交
3831 3832
	struct nfs_lockt_res res = {
		.denied = request,
L
Linus Torvalds 已提交
3833 3834 3835 3836 3837 3838 3839 3840 3841 3842
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
		.rpc_argp       = &arg,
		.rpc_resp       = &res,
		.rpc_cred	= state->owner->so_cred,
	};
	struct nfs4_lock_state *lsp;
	int status;

T
Trond Myklebust 已提交
3843
	arg.lock_owner.clientid = clp->cl_clientid;
3844 3845 3846 3847
	status = nfs4_set_lock_state(state, request);
	if (status != 0)
		goto out;
	lsp = request->fl_u.nfs4_fl.owner;
3848
	arg.lock_owner.id = lsp->ls_id.id;
3849
	arg.lock_owner.s_dev = server->s_dev;
A
Andy Adamson 已提交
3850
	status = nfs4_call_sync(server, &msg, &arg, &res, 1);
T
Trond Myklebust 已提交
3851 3852 3853 3854 3855 3856
	switch (status) {
		case 0:
			request->fl_type = F_UNLCK;
			break;
		case -NFS4ERR_DENIED:
			status = 0;
L
Linus Torvalds 已提交
3857
	}
3858
	request->fl_ops->fl_release_private(request);
3859
out:
L
Linus Torvalds 已提交
3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891
	return status;
}

static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
	struct nfs4_exception exception = { };
	int err;

	do {
		err = nfs4_handle_exception(NFS_SERVER(state->inode),
				_nfs4_proc_getlk(state, cmd, request),
				&exception);
	} while (exception.retry);
	return err;
}

static int do_vfs_lock(struct file *file, struct file_lock *fl)
{
	int res = 0;
	switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
		case FL_POSIX:
			res = posix_lock_file_wait(file, fl);
			break;
		case FL_FLOCK:
			res = flock_lock_file_wait(file, fl);
			break;
		default:
			BUG();
	}
	return res;
}

3892
struct nfs4_unlockdata {
T
Trond Myklebust 已提交
3893 3894
	struct nfs_locku_args arg;
	struct nfs_locku_res res;
3895 3896
	struct nfs4_lock_state *lsp;
	struct nfs_open_context *ctx;
T
Trond Myklebust 已提交
3897 3898
	struct file_lock fl;
	const struct nfs_server *server;
3899
	unsigned long timestamp;
3900 3901
};

T
Trond Myklebust 已提交
3902 3903 3904 3905 3906 3907 3908 3909
static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
		struct nfs_open_context *ctx,
		struct nfs4_lock_state *lsp,
		struct nfs_seqid *seqid)
{
	struct nfs4_unlockdata *p;
	struct inode *inode = lsp->ls_state->inode;

3910
	p = kzalloc(sizeof(*p), GFP_NOFS);
T
Trond Myklebust 已提交
3911 3912 3913 3914 3915
	if (p == NULL)
		return NULL;
	p->arg.fh = NFS_FH(inode);
	p->arg.fl = &p->fl;
	p->arg.seqid = seqid;
3916
	p->res.seqid = seqid;
T
Trond Myklebust 已提交
3917 3918 3919 3920 3921 3922 3923 3924 3925 3926
	p->arg.stateid = &lsp->ls_stateid;
	p->lsp = lsp;
	atomic_inc(&lsp->ls_count);
	/* Ensure we don't close file until we're done freeing locks! */
	p->ctx = get_nfs_open_context(ctx);
	memcpy(&p->fl, fl, sizeof(p->fl));
	p->server = NFS_SERVER(inode);
	return p;
}

3927
static void nfs4_locku_release_calldata(void *data)
3928
{
3929
	struct nfs4_unlockdata *calldata = data;
T
Trond Myklebust 已提交
3930
	nfs_free_seqid(calldata->arg.seqid);
3931 3932 3933
	nfs4_put_lock_state(calldata->lsp);
	put_nfs_open_context(calldata->ctx);
	kfree(calldata);
3934 3935
}

3936
static void nfs4_locku_done(struct rpc_task *task, void *data)
3937
{
3938
	struct nfs4_unlockdata *calldata = data;
3939

3940 3941
	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
		return;
3942 3943 3944
	switch (task->tk_status) {
		case 0:
			memcpy(calldata->lsp->ls_stateid.data,
T
Trond Myklebust 已提交
3945
					calldata->res.stateid.data,
3946
					sizeof(calldata->lsp->ls_stateid.data));
3947
			renew_lease(calldata->server, calldata->timestamp);
3948
			break;
3949 3950
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_OLD_STATEID:
3951 3952 3953 3954
		case -NFS4ERR_STALE_STATEID:
		case -NFS4ERR_EXPIRED:
			break;
		default:
3955
			if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3956
				nfs_restart_rpc(task,
3957
						 calldata->server->nfs_client);
3958 3959 3960
	}
}

T
Trond Myklebust 已提交
3961
static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3962
{
T
Trond Myklebust 已提交
3963
	struct nfs4_unlockdata *calldata = data;
3964

T
Trond Myklebust 已提交
3965
	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3966 3967
		return;
	if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3968 3969
		/* Note: exit _without_ running nfs4_locku_done */
		task->tk_action = NULL;
3970 3971
		return;
	}
3972
	calldata->timestamp = jiffies;
3973
	if (nfs4_setup_sequence(calldata->server,
3974 3975 3976
				&calldata->arg.seq_args,
				&calldata->res.seq_res, 1, task))
		return;
3977
	rpc_call_start(task);
3978 3979
}

3980
static const struct rpc_call_ops nfs4_locku_ops = {
T
Trond Myklebust 已提交
3981
	.rpc_call_prepare = nfs4_locku_prepare,
3982
	.rpc_call_done = nfs4_locku_done,
3983
	.rpc_release = nfs4_locku_release_calldata,
3984 3985
};

3986 3987 3988 3989 3990 3991
static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
		struct nfs_open_context *ctx,
		struct nfs4_lock_state *lsp,
		struct nfs_seqid *seqid)
{
	struct nfs4_unlockdata *data;
3992 3993 3994 3995
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
		.rpc_cred = ctx->cred,
	};
T
Trond Myklebust 已提交
3996 3997
	struct rpc_task_setup task_setup_data = {
		.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3998
		.rpc_message = &msg,
T
Trond Myklebust 已提交
3999
		.callback_ops = &nfs4_locku_ops,
4000
		.workqueue = nfsiod_workqueue,
T
Trond Myklebust 已提交
4001 4002
		.flags = RPC_TASK_ASYNC,
	};
4003

4004 4005 4006 4007 4008
	/* Ensure this is an unlock - when canceling a lock, the
	 * canceled lock is passed in, and it won't be an unlock.
	 */
	fl->fl_type = F_UNLCK;

4009 4010 4011 4012 4013 4014
	data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
	if (data == NULL) {
		nfs_free_seqid(seqid);
		return ERR_PTR(-ENOMEM);
	}

4015 4016
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;
T
Trond Myklebust 已提交
4017 4018
	task_setup_data.callback_data = data;
	return rpc_run_task(&task_setup_data);
4019 4020
}

4021 4022
static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
{
4023
	struct nfs_inode *nfsi = NFS_I(state->inode);
T
Trond Myklebust 已提交
4024
	struct nfs_seqid *seqid;
L
Linus Torvalds 已提交
4025
	struct nfs4_lock_state *lsp;
4026 4027
	struct rpc_task *task;
	int status = 0;
4028
	unsigned char fl_flags = request->fl_flags;
4029

4030
	status = nfs4_set_lock_state(state, request);
4031 4032
	/* Unlock _before_ we do the RPC call */
	request->fl_flags |= FL_EXISTS;
4033 4034 4035
	down_read(&nfsi->rwsem);
	if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
		up_read(&nfsi->rwsem);
4036
		goto out;
4037 4038
	}
	up_read(&nfsi->rwsem);
4039
	if (status != 0)
4040 4041 4042 4043
		goto out;
	/* Is this a delegated lock? */
	if (test_bit(NFS_DELEGATED_STATE, &state->flags))
		goto out;
4044
	lsp = request->fl_u.nfs4_fl.owner;
4045
	seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4046
	status = -ENOMEM;
T
Trond Myklebust 已提交
4047
	if (seqid == NULL)
4048
		goto out;
4049
	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4050 4051
	status = PTR_ERR(task);
	if (IS_ERR(task))
4052
		goto out;
4053
	status = nfs4_wait_for_completion_rpc_task(task);
4054
	rpc_put_task(task);
4055
out:
4056
	request->fl_flags = fl_flags;
L
Linus Torvalds 已提交
4057 4058 4059
	return status;
}

4060 4061 4062 4063 4064 4065
struct nfs4_lockdata {
	struct nfs_lock_args arg;
	struct nfs_lock_res res;
	struct nfs4_lock_state *lsp;
	struct nfs_open_context *ctx;
	struct file_lock fl;
4066
	unsigned long timestamp;
4067 4068
	int rpc_status;
	int cancelled;
4069
	struct nfs_server *server;
4070 4071 4072
};

static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4073 4074
		struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
		gfp_t gfp_mask)
L
Linus Torvalds 已提交
4075
{
4076 4077
	struct nfs4_lockdata *p;
	struct inode *inode = lsp->ls_state->inode;
L
Linus Torvalds 已提交
4078
	struct nfs_server *server = NFS_SERVER(inode);
4079

4080
	p = kzalloc(sizeof(*p), gfp_mask);
4081 4082 4083 4084 4085
	if (p == NULL)
		return NULL;

	p->arg.fh = NFS_FH(inode);
	p->arg.fl = &p->fl;
4086
	p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4087 4088
	if (p->arg.open_seqid == NULL)
		goto out_free;
4089
	p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4090
	if (p->arg.lock_seqid == NULL)
4091
		goto out_free_seqid;
4092
	p->arg.lock_stateid = &lsp->ls_stateid;
4093
	p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4094
	p->arg.lock_owner.id = lsp->ls_id.id;
4095
	p->arg.lock_owner.s_dev = server->s_dev;
4096
	p->res.lock_seqid = p->arg.lock_seqid;
4097
	p->lsp = lsp;
4098
	p->server = server;
4099 4100 4101 4102
	atomic_inc(&lsp->ls_count);
	p->ctx = get_nfs_open_context(ctx);
	memcpy(&p->fl, fl, sizeof(p->fl));
	return p;
4103 4104
out_free_seqid:
	nfs_free_seqid(p->arg.open_seqid);
4105 4106 4107 4108 4109 4110 4111 4112 4113
out_free:
	kfree(p);
	return NULL;
}

static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_lockdata *data = calldata;
	struct nfs4_state *state = data->lsp->ls_state;
4114

4115
	dprintk("%s: begin!\n", __func__);
4116 4117
	if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
		return;
4118 4119
	/* Do we need to do an open_to_lock_owner? */
	if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4120 4121
		if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
			return;
4122 4123
		data->arg.open_stateid = &state->stateid;
		data->arg.new_lock_owner = 1;
4124
		data->res.open_seqid = data->arg.open_seqid;
4125 4126
	} else
		data->arg.new_lock_owner = 0;
4127
	data->timestamp = jiffies;
4128 4129
	if (nfs4_setup_sequence(data->server,
				&data->arg.seq_args,
4130 4131
				&data->res.seq_res, 1, task))
		return;
4132
	rpc_call_start(task);
4133
	dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4134 4135
}

4136 4137 4138 4139 4140 4141
static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
{
	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
	nfs4_lock_prepare(task, calldata);
}

4142 4143 4144 4145
static void nfs4_lock_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_lockdata *data = calldata;

4146
	dprintk("%s: begin!\n", __func__);
4147

4148 4149
	if (!nfs4_sequence_done(task, &data->res.seq_res))
		return;
4150

4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161
	data->rpc_status = task->tk_status;
	if (data->arg.new_lock_owner != 0) {
		if (data->rpc_status == 0)
			nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
		else
			goto out;
	}
	if (data->rpc_status == 0) {
		memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
					sizeof(data->lsp->ls_stateid.data));
		data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4162
		renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4163 4164
	}
out:
4165
	dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4166 4167 4168 4169 4170 4171
}

static void nfs4_lock_release(void *calldata)
{
	struct nfs4_lockdata *data = calldata;

4172
	dprintk("%s: begin!\n", __func__);
4173
	nfs_free_seqid(data->arg.open_seqid);
4174 4175 4176 4177 4178
	if (data->cancelled != 0) {
		struct rpc_task *task;
		task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
				data->arg.lock_seqid);
		if (!IS_ERR(task))
4179
			rpc_put_task_async(task);
4180
		dprintk("%s: cancelling lock!\n", __func__);
4181 4182 4183 4184 4185
	} else
		nfs_free_seqid(data->arg.lock_seqid);
	nfs4_put_lock_state(data->lsp);
	put_nfs_open_context(data->ctx);
	kfree(data);
4186
	dprintk("%s: done!\n", __func__);
4187 4188 4189 4190 4191 4192 4193 4194
}

static const struct rpc_call_ops nfs4_lock_ops = {
	.rpc_call_prepare = nfs4_lock_prepare,
	.rpc_call_done = nfs4_lock_done,
	.rpc_release = nfs4_lock_release,
};

4195 4196 4197 4198 4199 4200
static const struct rpc_call_ops nfs4_recover_lock_ops = {
	.rpc_call_prepare = nfs4_recover_lock_prepare,
	.rpc_call_done = nfs4_lock_done,
	.rpc_release = nfs4_lock_release,
};

4201 4202 4203 4204 4205
static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
{
	switch (error) {
	case -NFS4ERR_ADMIN_REVOKED:
	case -NFS4ERR_BAD_STATEID:
4206
		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4207 4208
		if (new_lock_owner != 0 ||
		   (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4209
			nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4210 4211 4212
		break;
	case -NFS4ERR_STALE_STATEID:
		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4213 4214
	case -NFS4ERR_EXPIRED:
		nfs4_schedule_lease_recovery(server->nfs_client);
4215 4216 4217
	};
}

4218
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4219 4220 4221
{
	struct nfs4_lockdata *data;
	struct rpc_task *task;
4222 4223 4224 4225
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
		.rpc_cred = state->owner->so_cred,
	};
T
Trond Myklebust 已提交
4226 4227
	struct rpc_task_setup task_setup_data = {
		.rpc_client = NFS_CLIENT(state->inode),
4228
		.rpc_message = &msg,
T
Trond Myklebust 已提交
4229
		.callback_ops = &nfs4_lock_ops,
4230
		.workqueue = nfsiod_workqueue,
T
Trond Myklebust 已提交
4231 4232
		.flags = RPC_TASK_ASYNC,
	};
4233 4234
	int ret;

4235
	dprintk("%s: begin!\n", __func__);
4236
	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4237 4238
			fl->fl_u.nfs4_fl.owner,
			recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4239 4240 4241 4242
	if (data == NULL)
		return -ENOMEM;
	if (IS_SETLKW(cmd))
		data->arg.block = 1;
4243 4244
	if (recovery_type > NFS_LOCK_NEW) {
		if (recovery_type == NFS_LOCK_RECLAIM)
4245
			data->arg.reclaim = NFS_LOCK_RECLAIM;
4246 4247
		task_setup_data.callback_ops = &nfs4_recover_lock_ops;
	}
4248 4249
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;
T
Trond Myklebust 已提交
4250 4251
	task_setup_data.callback_data = data;
	task = rpc_run_task(&task_setup_data);
4252
	if (IS_ERR(task))
4253 4254 4255 4256
		return PTR_ERR(task);
	ret = nfs4_wait_for_completion_rpc_task(task);
	if (ret == 0) {
		ret = data->rpc_status;
4257 4258 4259
		if (ret)
			nfs4_handle_setlk_error(data->server, data->lsp,
					data->arg.new_lock_owner, ret);
4260 4261
	} else
		data->cancelled = 1;
4262
	rpc_put_task(task);
4263
	dprintk("%s: done, ret = %d!\n", __func__, ret);
4264
	return ret;
L
Linus Torvalds 已提交
4265 4266 4267 4268
}

static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
{
4269 4270 4271 4272 4273
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = { };
	int err;

	do {
4274 4275 4276
		/* Cache the lock if possible... */
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
			return 0;
4277
		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4278
		if (err != -NFS4ERR_DELAY)
4279 4280 4281 4282
			break;
		nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
	return err;
L
Linus Torvalds 已提交
4283 4284 4285 4286
}

static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
4287 4288 4289 4290
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = { };
	int err;

4291 4292 4293
	err = nfs4_set_lock_state(state, request);
	if (err != 0)
		return err;
4294
	do {
4295 4296
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
			return 0;
4297
		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4298 4299 4300 4301 4302 4303 4304 4305
		switch (err) {
		default:
			goto out;
		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
			nfs4_handle_exception(server, err, &exception);
			err = 0;
		}
4306
	} while (exception.retry);
4307
out:
4308
	return err;
L
Linus Torvalds 已提交
4309 4310 4311 4312
}

static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
4313
	struct nfs_inode *nfsi = NFS_I(state->inode);
4314
	unsigned char fl_flags = request->fl_flags;
4315
	int status = -ENOLCK;
L
Linus Torvalds 已提交
4316

4317 4318 4319
	if ((fl_flags & FL_POSIX) &&
			!test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
		goto out;
4320 4321 4322 4323
	/* Is this a delegated open? */
	status = nfs4_set_lock_state(state, request);
	if (status != 0)
		goto out;
4324 4325 4326 4327
	request->fl_flags |= FL_ACCESS;
	status = do_vfs_lock(request->fl_file, request);
	if (status < 0)
		goto out;
4328
	down_read(&nfsi->rwsem);
4329 4330 4331
	if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
		/* Yes: cache locks! */
		/* ...but avoid races with delegation recall... */
4332 4333 4334
		request->fl_flags = fl_flags & ~FL_SLEEP;
		status = do_vfs_lock(request->fl_file, request);
		goto out_unlock;
4335
	}
4336
	status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4337
	if (status != 0)
4338
		goto out_unlock;
4339
	/* Note: we always want to sleep here! */
4340
	request->fl_flags = fl_flags | FL_SLEEP;
4341
	if (do_vfs_lock(request->fl_file, request) < 0)
4342
		printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4343
out_unlock:
4344
	up_read(&nfsi->rwsem);
4345 4346
out:
	request->fl_flags = fl_flags;
L
Linus Torvalds 已提交
4347 4348 4349 4350 4351 4352 4353 4354 4355
	return status;
}

static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
	struct nfs4_exception exception = { };
	int err;

	do {
4356 4357 4358
		err = _nfs4_proc_setlk(state, cmd, request);
		if (err == -NFS4ERR_DENIED)
			err = -EAGAIN;
L
Linus Torvalds 已提交
4359
		err = nfs4_handle_exception(NFS_SERVER(state->inode),
4360
				err, &exception);
L
Linus Torvalds 已提交
4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373
	} while (exception.retry);
	return err;
}

static int
nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
{
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
	unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
	int status;

	/* verify open state */
4374
	ctx = nfs_file_open_context(filp);
L
Linus Torvalds 已提交
4375 4376 4377 4378 4379
	state = ctx->state;

	if (request->fl_start < 0 || request->fl_end < 0)
		return -EINVAL;

4380 4381 4382 4383 4384
	if (IS_GETLK(cmd)) {
		if (state != NULL)
			return nfs4_proc_getlk(state, F_GETLK, request);
		return 0;
	}
L
Linus Torvalds 已提交
4385 4386 4387 4388

	if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
		return -EINVAL;

4389 4390 4391 4392 4393
	if (request->fl_type == F_UNLCK) {
		if (state != NULL)
			return nfs4_proc_unlck(state, cmd, request);
		return 0;
	}
L
Linus Torvalds 已提交
4394

4395 4396
	if (state == NULL)
		return -ENOLCK;
L
Linus Torvalds 已提交
4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408
	do {
		status = nfs4_proc_setlk(state, cmd, request);
		if ((status != -EAGAIN) || IS_SETLK(cmd))
			break;
		timeout = nfs4_set_lock_task_retry(timeout);
		status = -ERESTARTSYS;
		if (signalled())
			break;
	} while(status < 0);
	return status;
}

4409 4410 4411 4412 4413 4414 4415 4416 4417 4418
int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
{
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = { };
	int err;

	err = nfs4_set_lock_state(state, fl);
	if (err != 0)
		goto out;
	do {
4419
		err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4420 4421 4422 4423 4424
		switch (err) {
			default:
				printk(KERN_ERR "%s: unhandled error %d.\n",
						__func__, err);
			case 0:
4425
			case -ESTALE:
4426 4427 4428
				goto out;
			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_STALE_CLIENTID:
4429
			case -NFS4ERR_STALE_STATEID:
4430 4431
				nfs4_schedule_lease_recovery(server->nfs_client);
				goto out;
4432 4433 4434 4435 4436
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
			case -NFS4ERR_DEADSESSION:
4437
				nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4438
				goto out;
4439 4440 4441 4442 4443 4444 4445 4446
			case -ERESTARTSYS:
				/*
				 * The show must go on: exit, but mark the
				 * stateid as needing recovery.
				 */
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_BAD_STATEID:
			case -NFS4ERR_OPENMODE:
4447
				nfs4_schedule_stateid_recovery(server, state);
4448 4449
				err = 0;
				goto out;
4450 4451 4452 4453 4454 4455 4456 4457 4458
			case -EKEYEXPIRED:
				/*
				 * User RPCSEC_GSS context has expired.
				 * We cannot recover this stateid now, so
				 * skip it and allow recovery thread to
				 * proceed.
				 */
				err = 0;
				goto out;
4459 4460 4461 4462 4463
			case -ENOMEM:
			case -NFS4ERR_DENIED:
				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
				err = 0;
				goto out;
4464 4465 4466
			case -NFS4ERR_DELAY:
				break;
		}
4467 4468 4469 4470 4471
		err = nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
out:
	return err;
}
4472

4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496
static void nfs4_release_lockowner_release(void *calldata)
{
	kfree(calldata);
}

const struct rpc_call_ops nfs4_release_lockowner_ops = {
	.rpc_release = nfs4_release_lockowner_release,
};

void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
{
	struct nfs_server *server = lsp->ls_state->owner->so_server;
	struct nfs_release_lockowner_args *args;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
	};

	if (server->nfs_client->cl_mvops->minor_version != 0)
		return;
	args = kmalloc(sizeof(*args), GFP_NOFS);
	if (!args)
		return;
	args->lock_owner.clientid = server->nfs_client->cl_clientid;
	args->lock_owner.id = lsp->ls_id.id;
4497
	args->lock_owner.s_dev = server->s_dev;
4498 4499 4500 4501
	msg.rpc_argp = args;
	rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
}

4502 4503
#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"

4504 4505 4506
static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
				   const void *buf, size_t buflen,
				   int flags, int type)
4507
{
4508 4509
	if (strcmp(key, "") != 0)
		return -EINVAL;
4510

4511
	return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4512 4513
}

4514 4515
static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
				   void *buf, size_t buflen, int type)
4516
{
4517 4518
	if (strcmp(key, "") != 0)
		return -EINVAL;
4519

4520
	return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4521 4522
}

4523 4524 4525
static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
				       size_t list_len, const char *name,
				       size_t name_len, int type)
4526
{
4527
	size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4528

4529 4530
	if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
		return 0;
4531 4532 4533

	if (list && len <= list_len)
		memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4534
	return len;
4535 4536
}

4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549
static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
{
	if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
		(fattr->valid & NFS_ATTR_FATTR_FSID) &&
		(fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
		return;

	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
		NFS_ATTR_FATTR_NLINK;
	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	fattr->nlink = 2;
}

4550
int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4551
		struct nfs4_fs_locations *fs_locations, struct page *page)
4552 4553 4554
{
	struct nfs_server *server = NFS_SERVER(dir);
	u32 bitmask[2] = {
4555 4556
		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
		[1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4557 4558 4559
	};
	struct nfs4_fs_locations_arg args = {
		.dir_fh = NFS_FH(dir),
4560
		.name = name,
4561 4562 4563
		.page = page,
		.bitmask = bitmask,
	};
B
Benny Halevy 已提交
4564 4565 4566
	struct nfs4_fs_locations_res res = {
		.fs_locations = fs_locations,
	};
4567 4568 4569
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
		.rpc_argp = &args,
B
Benny Halevy 已提交
4570
		.rpc_resp = &res,
4571 4572 4573
	};
	int status;

4574
	dprintk("%s: start\n", __func__);
4575
	nfs_fattr_init(&fs_locations->fattr);
4576
	fs_locations->server = server;
4577
	fs_locations->nlocations = 0;
A
Andy Adamson 已提交
4578
	status = nfs4_call_sync(server, &msg, &args, &res, 0);
4579
	nfs_fixup_referral_attributes(&fs_locations->fattr);
4580
	dprintk("%s: returned status = %d\n", __func__, status);
4581 4582 4583
	return status;
}

4584
#ifdef CONFIG_NFS_V4_1
4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603
/*
 * Check the exchange flags returned by the server for invalid flags, having
 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
 * DS flags set.
 */
static int nfs4_check_cl_exchange_flags(u32 flags)
{
	if (flags & ~EXCHGID4_FLAG_MASK_R)
		goto out_inval;
	if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
	    (flags & EXCHGID4_FLAG_USE_NON_PNFS))
		goto out_inval;
	if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
		goto out_inval;
	return NFS_OK;
out_inval:
	return -NFS4ERR_INVAL;
}

B
Benny Halevy 已提交
4604 4605 4606 4607 4608 4609 4610 4611
/*
 * nfs4_proc_exchange_id()
 *
 * Since the clientid has expired, all compounds using sessions
 * associated with the stale clientid will be returning
 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
 * be in some phase of session reset.
 */
4612
int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
B
Benny Halevy 已提交
4613 4614 4615 4616
{
	nfs4_verifier verifier;
	struct nfs41_exchange_id_args args = {
		.client = clp,
4617
		.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
B
Benny Halevy 已提交
4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632
	};
	struct nfs41_exchange_id_res res = {
		.client = clp,
	};
	int status;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = cred,
	};
	__be32 *p;

	dprintk("--> %s\n", __func__);
	BUG_ON(clp == NULL);
4633

B
Benny Halevy 已提交
4634 4635 4636 4637 4638
	p = (u32 *)verifier.data;
	*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
	*p = htonl((u32)clp->cl_boot_time.tv_nsec);
	args.verifier = &verifier;

4639 4640 4641 4642 4643 4644
	args.id_len = scnprintf(args.id, sizeof(args.id),
				"%s/%s.%s/%u",
				clp->cl_ipaddr,
				init_utsname()->nodename,
				init_utsname()->domainname,
				clp->cl_rpcclient->cl_auth->au_flavor);
B
Benny Halevy 已提交
4645

4646 4647 4648
	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
	if (!status)
		status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
B
Benny Halevy 已提交
4649 4650 4651 4652
	dprintk("<-- %s status= %d\n", __func__, status);
	return status;
}

A
Andy Adamson 已提交
4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666
struct nfs4_get_lease_time_data {
	struct nfs4_get_lease_time_args *args;
	struct nfs4_get_lease_time_res *res;
	struct nfs_client *clp;
};

static void nfs4_get_lease_time_prepare(struct rpc_task *task,
					void *calldata)
{
	int ret;
	struct nfs4_get_lease_time_data *data =
			(struct nfs4_get_lease_time_data *)calldata;

	dprintk("--> %s\n", __func__);
4667
	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
A
Andy Adamson 已提交
4668 4669 4670
	/* just setup sequence, do not trigger session recovery
	   since we're invoked within one */
	ret = nfs41_setup_sequence(data->clp->cl_session,
4671 4672
				   &data->args->la_seq_args,
				   &data->res->lr_seq_res, 0, task);
A
Andy Adamson 已提交
4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688

	BUG_ON(ret == -EAGAIN);
	rpc_call_start(task);
	dprintk("<-- %s\n", __func__);
}

/*
 * Called from nfs4_state_manager thread for session setup, so don't recover
 * from sequence operation or clientid errors.
 */
static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_get_lease_time_data *data =
			(struct nfs4_get_lease_time_data *)calldata;

	dprintk("--> %s\n", __func__);
4689 4690
	if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
		return;
A
Andy Adamson 已提交
4691 4692 4693 4694 4695 4696
	switch (task->tk_status) {
	case -NFS4ERR_DELAY:
	case -NFS4ERR_GRACE:
		dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
		rpc_delay(task, NFS4_POLL_RETRY_MIN);
		task->tk_status = 0;
4697
		nfs_restart_rpc(task, data->clp);
A
Andy Adamson 已提交
4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746
		return;
	}
	dprintk("<-- %s\n", __func__);
}

struct rpc_call_ops nfs4_get_lease_time_ops = {
	.rpc_call_prepare = nfs4_get_lease_time_prepare,
	.rpc_call_done = nfs4_get_lease_time_done,
};

int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
{
	struct rpc_task *task;
	struct nfs4_get_lease_time_args args;
	struct nfs4_get_lease_time_res res = {
		.lr_fsinfo = fsinfo,
	};
	struct nfs4_get_lease_time_data data = {
		.args = &args,
		.res = &res,
		.clp = clp,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	struct rpc_task_setup task_setup = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
		.callback_ops = &nfs4_get_lease_time_ops,
		.callback_data = &data
	};
	int status;

	dprintk("--> %s\n", __func__);
	task = rpc_run_task(&task_setup);

	if (IS_ERR(task))
		status = PTR_ERR(task);
	else {
		status = task->tk_status;
		rpc_put_task(task);
	}
	dprintk("<-- %s return %d\n", __func__, status);

	return status;
}

4747 4748 4749
/*
 * Reset a slot table
 */
A
Andy Adamson 已提交
4750 4751
static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
				 int ivalue)
4752
{
A
Andy Adamson 已提交
4753
	struct nfs4_slot *new = NULL;
4754
	int i;
4755 4756
	int ret = 0;

A
Andy Adamson 已提交
4757 4758
	dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
		max_reqs, tbl->max_slots);
4759

A
Andy Adamson 已提交
4760 4761 4762 4763
	/* Does the newly negotiated max_reqs match the existing slot table? */
	if (max_reqs != tbl->max_slots) {
		ret = -ENOMEM;
		new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4764
			      GFP_NOFS);
A
Andy Adamson 已提交
4765 4766 4767 4768
		if (!new)
			goto out;
		ret = 0;
		kfree(tbl->slots);
4769 4770
	}
	spin_lock(&tbl->slot_tbl_lock);
A
Andy Adamson 已提交
4771 4772 4773 4774 4775
	if (new) {
		tbl->slots = new;
		tbl->max_slots = max_reqs;
	}
	for (i = 0; i < tbl->max_slots; ++i)
4776
		tbl->slots[i].seq_nr = ivalue;
4777 4778 4779 4780 4781 4782 4783 4784
	spin_unlock(&tbl->slot_tbl_lock);
	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
		tbl, tbl->slots, tbl->max_slots);
out:
	dprintk("<-- %s: return %d\n", __func__, ret);
	return ret;
}

4785 4786 4787 4788 4789 4790 4791 4792
/*
 * Reset the forechannel and backchannel slot tables
 */
static int nfs4_reset_slot_tables(struct nfs4_session *session)
{
	int status;

	status = nfs4_reset_slot_table(&session->fc_slot_table,
A
Andy Adamson 已提交
4793
			session->fc_attrs.max_reqs, 1);
4794 4795 4796 4797
	if (status)
		return status;

	status = nfs4_reset_slot_table(&session->bc_slot_table,
A
Andy Adamson 已提交
4798
			session->bc_attrs.max_reqs, 0);
4799 4800 4801
	return status;
}

4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815
/* Destroy the slot table */
static void nfs4_destroy_slot_tables(struct nfs4_session *session)
{
	if (session->fc_slot_table.slots != NULL) {
		kfree(session->fc_slot_table.slots);
		session->fc_slot_table.slots = NULL;
	}
	if (session->bc_slot_table.slots != NULL) {
		kfree(session->bc_slot_table.slots);
		session->bc_slot_table.slots = NULL;
	}
	return;
}

A
Andy Adamson 已提交
4816 4817 4818
/*
 * Initialize slot table
 */
4819 4820
static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
		int max_slots, int ivalue)
A
Andy Adamson 已提交
4821 4822 4823 4824 4825 4826
{
	struct nfs4_slot *slot;
	int ret = -ENOMEM;

	BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);

4827
	dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
A
Andy Adamson 已提交
4828

4829
	slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
A
Andy Adamson 已提交
4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845
	if (!slot)
		goto out;
	ret = 0;

	spin_lock(&tbl->slot_tbl_lock);
	tbl->max_slots = max_slots;
	tbl->slots = slot;
	tbl->highest_used_slotid = -1;  /* no slot is currently used */
	spin_unlock(&tbl->slot_tbl_lock);
	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
		tbl, tbl->slots, tbl->max_slots);
out:
	dprintk("<-- %s: return %d\n", __func__, ret);
	return ret;
}

4846 4847 4848 4849 4850
/*
 * Initialize the forechannel and backchannel tables
 */
static int nfs4_init_slot_tables(struct nfs4_session *session)
{
4851 4852
	struct nfs4_slot_table *tbl;
	int status = 0;
4853

4854 4855 4856 4857 4858 4859 4860
	tbl = &session->fc_slot_table;
	if (tbl->slots == NULL) {
		status = nfs4_init_slot_table(tbl,
				session->fc_attrs.max_reqs, 1);
		if (status)
			return status;
	}
4861

4862 4863 4864 4865 4866 4867 4868
	tbl = &session->bc_slot_table;
	if (tbl->slots == NULL) {
		status = nfs4_init_slot_table(tbl,
				session->bc_attrs.max_reqs, 0);
		if (status)
			nfs4_destroy_slot_tables(session);
	}
4869 4870

	return status;
4871 4872 4873 4874 4875 4876 4877
}

struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
{
	struct nfs4_session *session;
	struct nfs4_slot_table *tbl;

4878
	session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4879 4880
	if (!session)
		return NULL;
4881

4882
	tbl = &session->fc_slot_table;
4883
	tbl->highest_used_slotid = -1;
4884
	spin_lock_init(&tbl->slot_tbl_lock);
4885
	rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4886
	init_completion(&tbl->complete);
4887 4888

	tbl = &session->bc_slot_table;
4889
	tbl->highest_used_slotid = -1;
4890 4891
	spin_lock_init(&tbl->slot_tbl_lock);
	rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4892
	init_completion(&tbl->complete);
4893

4894 4895
	session->session_state = 1<<NFS4_SESSION_INITING;

4896 4897 4898 4899 4900 4901
	session->clp = clp;
	return session;
}

void nfs4_destroy_session(struct nfs4_session *session)
{
4902 4903 4904 4905 4906
	nfs4_proc_destroy_session(session);
	dprintk("%s Destroy backchannel for xprt %p\n",
		__func__, session->clp->cl_rpcclient->cl_xprt);
	xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
				NFS41_BC_MIN_CALLBACKS);
4907
	nfs4_destroy_slot_tables(session);
4908 4909 4910
	kfree(session);
}

A
Andy Adamson 已提交
4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937
/*
 * Initialize the values to be used by the client in CREATE_SESSION
 * If nfs4_init_session set the fore channel request and response sizes,
 * use them.
 *
 * Set the back channel max_resp_sz_cached to zero to force the client to
 * always set csa_cachethis to FALSE because the current implementation
 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
 */
static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
{
	struct nfs4_session *session = args->client->cl_session;
	unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
		     mxresp_sz = session->fc_attrs.max_resp_sz;

	if (mxrqst_sz == 0)
		mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
	if (mxresp_sz == 0)
		mxresp_sz = NFS_MAX_FILE_IO_SIZE;
	/* Fore channel attributes */
	args->fc_attrs.headerpadsz = 0;
	args->fc_attrs.max_rqst_sz = mxrqst_sz;
	args->fc_attrs.max_resp_sz = mxresp_sz;
	args->fc_attrs.max_ops = NFS4_MAX_OPS;
	args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;

	dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4938
		"max_ops=%u max_reqs=%u\n",
A
Andy Adamson 已提交
4939 4940
		__func__,
		args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4941
		args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
A
Andy Adamson 已提交
4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958

	/* Back channel attributes */
	args->bc_attrs.headerpadsz = 0;
	args->bc_attrs.max_rqst_sz = PAGE_SIZE;
	args->bc_attrs.max_resp_sz = PAGE_SIZE;
	args->bc_attrs.max_resp_sz_cached = 0;
	args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
	args->bc_attrs.max_reqs = 1;

	dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
		__func__,
		args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
		args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
		args->bc_attrs.max_reqs);
}

4959
static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4960
{
4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978
	struct nfs4_channel_attrs *sent = &args->fc_attrs;
	struct nfs4_channel_attrs *rcvd = &session->fc_attrs;

	if (rcvd->headerpadsz > sent->headerpadsz)
		return -EINVAL;
	if (rcvd->max_resp_sz > sent->max_resp_sz)
		return -EINVAL;
	/*
	 * Our requested max_ops is the minimum we need; we're not
	 * prepared to break up compounds into smaller pieces than that.
	 * So, no point even trying to continue if the server won't
	 * cooperate:
	 */
	if (rcvd->max_ops < sent->max_ops)
		return -EINVAL;
	if (rcvd->max_reqs == 0)
		return -EINVAL;
	return 0;
4979 4980
}

4981 4982 4983 4984
static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
{
	struct nfs4_channel_attrs *sent = &args->bc_attrs;
	struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4985

4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998
	if (rcvd->max_rqst_sz > sent->max_rqst_sz)
		return -EINVAL;
	if (rcvd->max_resp_sz < sent->max_resp_sz)
		return -EINVAL;
	if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
		return -EINVAL;
	/* These would render the backchannel useless: */
	if (rcvd->max_ops  == 0)
		return -EINVAL;
	if (rcvd->max_reqs == 0)
		return -EINVAL;
	return 0;
}
4999 5000 5001 5002

static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
				     struct nfs4_session *session)
{
5003
	int ret;
5004

5005 5006 5007 5008
	ret = nfs4_verify_fore_channel_attrs(args, session);
	if (ret)
		return ret;
	return nfs4_verify_back_channel_attrs(args, session);
5009 5010
}

A
Andy Adamson 已提交
5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028
static int _nfs4_proc_create_session(struct nfs_client *clp)
{
	struct nfs4_session *session = clp->cl_session;
	struct nfs41_create_session_args args = {
		.client = clp,
		.cb_program = NFS4_CALLBACK,
	};
	struct nfs41_create_session_res res = {
		.client = clp,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	int status;

	nfs4_init_channel_attrs(&args);
5029
	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
A
Andy Adamson 已提交
5030 5031 5032

	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);

5033 5034 5035
	if (!status)
		/* Verify the session's negotiated channel_attrs values */
		status = nfs4_verify_channel_attrs(&args, session);
A
Andy Adamson 已提交
5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048
	if (!status) {
		/* Increment the clientid slot sequence id */
		clp->cl_seqid++;
	}

	return status;
}

/*
 * Issues a CREATE_SESSION operation to the server.
 * It is the responsibility of the caller to verify the session is
 * expired before calling this routine.
 */
5049
int nfs4_proc_create_session(struct nfs_client *clp)
A
Andy Adamson 已提交
5050 5051 5052 5053
{
	int status;
	unsigned *ptr;
	struct nfs4_session *session = clp->cl_session;
5054 5055
	long timeout = 0;
	int err;
A
Andy Adamson 已提交
5056 5057 5058

	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);

5059 5060 5061 5062 5063 5064 5065 5066 5067
	do {
		status = _nfs4_proc_create_session(clp);
		if (status == -NFS4ERR_DELAY) {
			err = nfs4_delay(clp->cl_rpcclient, &timeout);
			if (err)
				status = err;
		}
	} while (status == -NFS4ERR_DELAY);

A
Andy Adamson 已提交
5068 5069 5070
	if (status)
		goto out;

5071 5072 5073 5074 5075 5076 5077
	/* Init and reset the fore channel */
	status = nfs4_init_slot_tables(session);
	dprintk("slot table initialization returned %d\n", status);
	if (status)
		goto out;
	status = nfs4_reset_slot_tables(session);
	dprintk("slot table reset returned %d\n", status);
A
Andy Adamson 已提交
5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088
	if (status)
		goto out;

	ptr = (unsigned *)&session->sess_id.data[0];
	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
out:
	dprintk("<-- %s\n", __func__);
	return status;
}

A
Andy Adamson 已提交
5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118
/*
 * Issue the over-the-wire RPC DESTROY_SESSION.
 * The caller must serialize access to this routine.
 */
int nfs4_proc_destroy_session(struct nfs4_session *session)
{
	int status = 0;
	struct rpc_message msg;

	dprintk("--> nfs4_proc_destroy_session\n");

	/* session is still being setup */
	if (session->clp->cl_cons_state != NFS_CS_READY)
		return status;

	msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
	msg.rpc_argp = session;
	msg.rpc_resp = NULL;
	msg.rpc_cred = NULL;
	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);

	if (status)
		printk(KERN_WARNING
			"Got error %d from the server on DESTROY_SESSION. "
			"Session has been destroyed regardless...\n", status);

	dprintk("<-- nfs4_proc_destroy_session\n");
	return status;
}

5119 5120 5121
int nfs4_init_session(struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;
5122
	struct nfs4_session *session;
5123
	unsigned int rsize, wsize;
5124 5125 5126 5127 5128
	int ret;

	if (!nfs4_has_session(clp))
		return 0;

5129 5130 5131 5132
	session = clp->cl_session;
	if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
		return 0;

5133 5134 5135 5136 5137 5138 5139 5140 5141
	rsize = server->rsize;
	if (rsize == 0)
		rsize = NFS_MAX_FILE_IO_SIZE;
	wsize = server->wsize;
	if (wsize == 0)
		wsize = NFS_MAX_FILE_IO_SIZE;

	session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
	session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5142

5143 5144 5145 5146 5147 5148
	ret = nfs4_recover_expired_lease(server);
	if (!ret)
		ret = nfs4_check_client_ready(clp);
	return ret;
}

A
Andy Adamson 已提交
5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169
int nfs4_init_ds_session(struct nfs_client *clp)
{
	struct nfs4_session *session = clp->cl_session;
	int ret;

	if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
		return 0;

	ret = nfs4_client_recover_expired_lease(clp);
	if (!ret)
		/* Test for the DS role */
		if (!is_ds_client(clp))
			ret = -ENODEV;
	if (!ret)
		ret = nfs4_check_client_ready(clp);
	return ret;

}
EXPORT_SYMBOL_GPL(nfs4_init_ds_session);


A
Andy Adamson 已提交
5170 5171 5172
/*
 * Renew the cl_session lease.
 */
5173 5174 5175 5176 5177 5178
struct nfs4_sequence_data {
	struct nfs_client *clp;
	struct nfs4_sequence_args args;
	struct nfs4_sequence_res res;
};

5179 5180
static void nfs41_sequence_release(void *data)
{
5181 5182
	struct nfs4_sequence_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
5183

5184 5185 5186
	if (atomic_read(&clp->cl_count) > 1)
		nfs4_schedule_state_renewal(clp);
	nfs_put_client(clp);
5187
	kfree(calldata);
5188 5189
}

5190 5191 5192 5193 5194 5195 5196
static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
{
	switch(task->tk_status) {
	case -NFS4ERR_DELAY:
		rpc_delay(task, NFS4_POLL_RETRY_MAX);
		return -EAGAIN;
	default:
5197
		nfs4_schedule_lease_recovery(clp);
5198 5199 5200 5201
	}
	return 0;
}

5202
static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
A
Andy Adamson 已提交
5203
{
5204 5205
	struct nfs4_sequence_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
A
Andy Adamson 已提交
5206

5207 5208
	if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
		return;
A
Andy Adamson 已提交
5209 5210 5211

	if (task->tk_status < 0) {
		dprintk("%s ERROR %d\n", __func__, task->tk_status);
5212 5213
		if (atomic_read(&clp->cl_count) == 1)
			goto out;
A
Andy Adamson 已提交
5214

5215 5216
		if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
			rpc_restart_call_prepare(task);
A
Andy Adamson 已提交
5217 5218 5219 5220
			return;
		}
	}
	dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5221
out:
A
Andy Adamson 已提交
5222 5223 5224 5225 5226
	dprintk("<-- %s\n", __func__);
}

static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
{
5227 5228
	struct nfs4_sequence_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
A
Andy Adamson 已提交
5229 5230 5231 5232 5233 5234
	struct nfs4_sequence_args *args;
	struct nfs4_sequence_res *res;

	args = task->tk_msg.rpc_argp;
	res = task->tk_msg.rpc_resp;

5235
	if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
A
Andy Adamson 已提交
5236 5237 5238 5239 5240 5241 5242
		return;
	rpc_call_start(task);
}

static const struct rpc_call_ops nfs41_sequence_ops = {
	.rpc_call_done = nfs41_sequence_call_done,
	.rpc_call_prepare = nfs41_sequence_prepare,
5243
	.rpc_release = nfs41_sequence_release,
A
Andy Adamson 已提交
5244 5245
};

5246
static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
A
Andy Adamson 已提交
5247
{
5248
	struct nfs4_sequence_data *calldata;
A
Andy Adamson 已提交
5249 5250 5251 5252
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
		.rpc_cred = cred,
	};
5253 5254 5255 5256 5257 5258
	struct rpc_task_setup task_setup_data = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
		.callback_ops = &nfs41_sequence_ops,
		.flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
	};
A
Andy Adamson 已提交
5259

5260
	if (!atomic_inc_not_zero(&clp->cl_count))
5261
		return ERR_PTR(-EIO);
5262
	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5263
	if (calldata == NULL) {
5264
		nfs_put_client(clp);
5265
		return ERR_PTR(-ENOMEM);
A
Andy Adamson 已提交
5266
	}
5267 5268 5269
	msg.rpc_argp = &calldata->args;
	msg.rpc_resp = &calldata->res;
	calldata->clp = clp;
5270
	task_setup_data.callback_data = calldata;
A
Andy Adamson 已提交
5271

5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283
	return rpc_run_task(&task_setup_data);
}

static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
{
	struct rpc_task *task;
	int ret = 0;

	task = _nfs41_proc_sequence(clp, cred);
	if (IS_ERR(task))
		ret = PTR_ERR(task);
	else
5284
		rpc_put_task_async(task);
5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299
	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
}

static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
{
	struct rpc_task *task;
	int ret;

	task = _nfs41_proc_sequence(clp, cred);
	if (IS_ERR(task)) {
		ret = PTR_ERR(task);
		goto out;
	}
	ret = rpc_wait_for_completion_task(task);
5300 5301 5302 5303 5304
	if (!ret) {
		struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;

		if (task->tk_status == 0)
			nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5305
		ret = task->tk_status;
5306
	}
5307 5308 5309 5310
	rpc_put_task(task);
out:
	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
A
Andy Adamson 已提交
5311 5312
}

5313 5314 5315 5316 5317 5318 5319 5320 5321 5322
struct nfs4_reclaim_complete_data {
	struct nfs_client *clp;
	struct nfs41_reclaim_complete_args arg;
	struct nfs41_reclaim_complete_res res;
};

static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
{
	struct nfs4_reclaim_complete_data *calldata = data;

5323
	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5324 5325
	if (nfs41_setup_sequence(calldata->clp->cl_session,
				&calldata->arg.seq_args,
5326 5327 5328 5329 5330 5331
				&calldata->res.seq_res, 0, task))
		return;

	rpc_call_start(task);
}

5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342
static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
{
	switch(task->tk_status) {
	case 0:
	case -NFS4ERR_COMPLETE_ALREADY:
	case -NFS4ERR_WRONG_CRED: /* What to do here? */
		break;
	case -NFS4ERR_DELAY:
		rpc_delay(task, NFS4_POLL_RETRY_MAX);
		return -EAGAIN;
	default:
5343
		nfs4_schedule_lease_recovery(clp);
5344 5345 5346 5347
	}
	return 0;
}

5348 5349 5350 5351 5352 5353 5354
static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
{
	struct nfs4_reclaim_complete_data *calldata = data;
	struct nfs_client *clp = calldata->clp;
	struct nfs4_sequence_res *res = &calldata->res.seq_res;

	dprintk("--> %s\n", __func__);
5355 5356
	if (!nfs41_sequence_done(task, res))
		return;
5357

5358 5359 5360 5361
	if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
		rpc_restart_call_prepare(task);
		return;
	}
5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396
	dprintk("<-- %s\n", __func__);
}

static void nfs4_free_reclaim_complete_data(void *data)
{
	struct nfs4_reclaim_complete_data *calldata = data;

	kfree(calldata);
}

static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
	.rpc_call_prepare = nfs4_reclaim_complete_prepare,
	.rpc_call_done = nfs4_reclaim_complete_done,
	.rpc_release = nfs4_free_reclaim_complete_data,
};

/*
 * Issue a global reclaim complete.
 */
static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
{
	struct nfs4_reclaim_complete_data *calldata;
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = clp->cl_rpcclient,
		.rpc_message = &msg,
		.callback_ops = &nfs4_reclaim_complete_call_ops,
		.flags = RPC_TASK_ASYNC,
	};
	int status = -ENOMEM;

	dprintk("--> %s\n", __func__);
5397
	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5398 5399 5400 5401 5402 5403 5404 5405 5406
	if (calldata == NULL)
		goto out;
	calldata->clp = clp;
	calldata->arg.one_fs = 0;

	msg.rpc_argp = &calldata->arg;
	msg.rpc_resp = &calldata->res;
	task_setup_data.callback_data = calldata;
	task = rpc_run_task(&task_setup_data);
5407
	if (IS_ERR(task)) {
5408
		status = PTR_ERR(task);
5409 5410
		goto out;
	}
5411 5412 5413
	status = nfs4_wait_for_completion_rpc_task(task);
	if (status == 0)
		status = task->tk_status;
5414
	rpc_put_task(task);
5415
	return 0;
5416 5417 5418 5419
out:
	dprintk("<-- %s status=%d\n", __func__, status);
	return status;
}
5420 5421 5422 5423 5424

static void
nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;
F
Fred Isaman 已提交
5425
	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5426 5427

	dprintk("--> %s\n", __func__);
F
Fred Isaman 已提交
5428 5429 5430 5431 5432
	/* Note the is a race here, where a CB_LAYOUTRECALL can come in
	 * right now covering the LAYOUTGET we are about to send.
	 * However, that is not so catastrophic, and there seems
	 * to be no way to prevent it completely.
	 */
5433 5434 5435
	if (nfs4_setup_sequence(server, &lgp->args.seq_args,
				&lgp->res.seq_res, 0, task))
		return;
5436 5437 5438 5439 5440 5441
	if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
					  NFS_I(lgp->args.inode)->layout,
					  lgp->args.ctx->state)) {
		rpc_exit(task, NFS4_OK);
		return;
	}
5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519
	rpc_call_start(task);
}

static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;
	struct nfs_server *server = NFS_SERVER(lgp->args.inode);

	dprintk("--> %s\n", __func__);

	if (!nfs4_sequence_done(task, &lgp->res.seq_res))
		return;

	switch (task->tk_status) {
	case 0:
		break;
	case -NFS4ERR_LAYOUTTRYLATER:
	case -NFS4ERR_RECALLCONFLICT:
		task->tk_status = -NFS4ERR_DELAY;
		/* Fall through */
	default:
		if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
			rpc_restart_call_prepare(task);
			return;
		}
	}
	dprintk("<-- %s\n", __func__);
}

static void nfs4_layoutget_release(void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;

	dprintk("--> %s\n", __func__);
	if (lgp->res.layout.buf != NULL)
		free_page((unsigned long) lgp->res.layout.buf);
	put_nfs_open_context(lgp->args.ctx);
	kfree(calldata);
	dprintk("<-- %s\n", __func__);
}

static const struct rpc_call_ops nfs4_layoutget_call_ops = {
	.rpc_call_prepare = nfs4_layoutget_prepare,
	.rpc_call_done = nfs4_layoutget_done,
	.rpc_release = nfs4_layoutget_release,
};

int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
{
	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
		.rpc_argp = &lgp->args,
		.rpc_resp = &lgp->res,
	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
		.rpc_message = &msg,
		.callback_ops = &nfs4_layoutget_call_ops,
		.callback_data = lgp,
		.flags = RPC_TASK_ASYNC,
	};
	int status = 0;

	dprintk("--> %s\n", __func__);

	lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
	if (lgp->res.layout.buf == NULL) {
		nfs4_layoutget_release(lgp);
		return -ENOMEM;
	}

	lgp->res.seq_res.sr_slot = NULL;
	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
	status = nfs4_wait_for_completion_rpc_task(task);
F
Fred Isaman 已提交
5520 5521 5522 5523
	if (status == 0)
		status = task->tk_status;
	if (status == 0)
		status = pnfs_layout_process(lgp);
5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565
	rpc_put_task(task);
	dprintk("<-- %s status=%d\n", __func__, status);
	return status;
}

static int
_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
{
	struct nfs4_getdeviceinfo_args args = {
		.pdev = pdev,
	};
	struct nfs4_getdeviceinfo_res res = {
		.pdev = pdev,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	int status;

	dprintk("--> %s\n", __func__);
	status = nfs4_call_sync(server, &msg, &args, &res, 0);
	dprintk("<-- %s status=%d\n", __func__, status);

	return status;
}

int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
{
	struct nfs4_exception exception = { };
	int err;

	do {
		err = nfs4_handle_exception(server,
					_nfs4_proc_getdeviceinfo(server, pdev),
					&exception);
	} while (exception.retry);
	return err;
}
EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);

5566 5567
#endif /* CONFIG_NFS_V4_1 */

5568
struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5569
	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5570
	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
L
Linus Torvalds 已提交
5571 5572
	.recover_open	= nfs4_open_reclaim,
	.recover_lock	= nfs4_lock_reclaim,
5573
	.establish_clid = nfs4_init_clientid,
5574
	.get_clid_cred	= nfs4_get_setclientid_cred,
L
Linus Torvalds 已提交
5575 5576
};

5577 5578 5579 5580 5581 5582
#if defined(CONFIG_NFS_V4_1)
struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
	.recover_open	= nfs4_open_reclaim,
	.recover_lock	= nfs4_lock_reclaim,
5583
	.establish_clid = nfs41_init_clientid,
5584
	.get_clid_cred	= nfs4_get_exchange_id_cred,
5585
	.reclaim_complete = nfs41_proc_reclaim_complete,
5586 5587 5588 5589 5590 5591 5592 5593 5594
};
#endif /* CONFIG_NFS_V4_1 */

struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
	.recover_open	= nfs4_open_expired,
	.recover_lock	= nfs4_lock_expired,
	.establish_clid = nfs4_init_clientid,
5595
	.get_clid_cred	= nfs4_get_setclientid_cred,
5596 5597 5598 5599
};

#if defined(CONFIG_NFS_V4_1)
struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5600
	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5601
	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
L
Linus Torvalds 已提交
5602 5603
	.recover_open	= nfs4_open_expired,
	.recover_lock	= nfs4_lock_expired,
5604
	.establish_clid = nfs41_init_clientid,
5605
	.get_clid_cred	= nfs4_get_exchange_id_cred,
L
Linus Torvalds 已提交
5606
};
5607
#endif /* CONFIG_NFS_V4_1 */
L
Linus Torvalds 已提交
5608

B
Benny Halevy 已提交
5609 5610
struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
	.sched_state_renewal = nfs4_proc_async_renew,
5611
	.get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5612
	.renew_lease = nfs4_proc_renew,
B
Benny Halevy 已提交
5613 5614 5615 5616 5617
};

#if defined(CONFIG_NFS_V4_1)
struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
	.sched_state_renewal = nfs41_proc_async_sequence,
5618
	.get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5619
	.renew_lease = nfs4_proc_sequence,
B
Benny Halevy 已提交
5620 5621 5622
};
#endif

5623 5624 5625
static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
	.minor_version = 0,
	.call_sync = _nfs4_call_sync,
5626
	.validate_stateid = nfs4_validate_delegation_stateid,
5627 5628 5629
	.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
	.nograce_recovery_ops = &nfs40_nograce_recovery_ops,
	.state_renewal_ops = &nfs40_state_renewal_ops,
5630 5631 5632 5633 5634 5635
};

#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
	.minor_version = 1,
	.call_sync = _nfs4_call_sync_session,
5636
	.validate_stateid = nfs41_validate_delegation_stateid,
5637 5638 5639
	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
	.state_renewal_ops = &nfs41_state_renewal_ops,
5640 5641 5642 5643 5644 5645 5646 5647 5648 5649
};
#endif

const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
	[0] = &nfs_v4_0_minor_ops,
#if defined(CONFIG_NFS_V4_1)
	[1] = &nfs_v4_1_minor_ops,
#endif
};

5650
static const struct inode_operations nfs4_file_inode_operations = {
5651 5652 5653
	.permission	= nfs_permission,
	.getattr	= nfs_getattr,
	.setattr	= nfs_setattr,
5654 5655 5656 5657
	.getxattr	= generic_getxattr,
	.setxattr	= generic_setxattr,
	.listxattr	= generic_listxattr,
	.removexattr	= generic_removexattr,
5658 5659
};

D
David Howells 已提交
5660
const struct nfs_rpc_ops nfs_v4_clientops = {
L
Linus Torvalds 已提交
5661 5662 5663
	.version	= 4,			/* protocol version */
	.dentry_ops	= &nfs4_dentry_operations,
	.dir_inode_ops	= &nfs4_dir_inode_operations,
5664
	.file_inode_ops	= &nfs4_file_inode_operations,
L
Linus Torvalds 已提交
5665 5666 5667
	.getroot	= nfs4_proc_get_root,
	.getattr	= nfs4_proc_getattr,
	.setattr	= nfs4_proc_setattr,
D
David Howells 已提交
5668
	.lookupfh	= nfs4_proc_lookupfh,
L
Linus Torvalds 已提交
5669 5670 5671 5672 5673 5674 5675 5676
	.lookup		= nfs4_proc_lookup,
	.access		= nfs4_proc_access,
	.readlink	= nfs4_proc_readlink,
	.create		= nfs4_proc_create,
	.remove		= nfs4_proc_remove,
	.unlink_setup	= nfs4_proc_unlink_setup,
	.unlink_done	= nfs4_proc_unlink_done,
	.rename		= nfs4_proc_rename,
5677 5678
	.rename_setup	= nfs4_proc_rename_setup,
	.rename_done	= nfs4_proc_rename_done,
L
Linus Torvalds 已提交
5679 5680 5681 5682 5683 5684 5685 5686 5687
	.link		= nfs4_proc_link,
	.symlink	= nfs4_proc_symlink,
	.mkdir		= nfs4_proc_mkdir,
	.rmdir		= nfs4_proc_remove,
	.readdir	= nfs4_proc_readdir,
	.mknod		= nfs4_proc_mknod,
	.statfs		= nfs4_proc_statfs,
	.fsinfo		= nfs4_proc_fsinfo,
	.pathconf	= nfs4_proc_pathconf,
5688
	.set_capabilities = nfs4_server_capabilities,
L
Linus Torvalds 已提交
5689 5690
	.decode_dirent	= nfs4_decode_dirent,
	.read_setup	= nfs4_proc_read_setup,
T
Trond Myklebust 已提交
5691
	.read_done	= nfs4_read_done,
L
Linus Torvalds 已提交
5692
	.write_setup	= nfs4_proc_write_setup,
5693
	.write_done	= nfs4_write_done,
L
Linus Torvalds 已提交
5694
	.commit_setup	= nfs4_proc_commit_setup,
5695
	.commit_done	= nfs4_commit_done,
L
Linus Torvalds 已提交
5696
	.lock		= nfs4_proc_lock,
5697
	.clear_acl_cache = nfs4_zap_acl_attr,
T
Trond Myklebust 已提交
5698
	.close_context  = nfs4_close_context,
5699
	.open_context	= nfs4_atomic_open,
5700
	.init_client	= nfs4_init_client,
L
Linus Torvalds 已提交
5701 5702
};

5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714
static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
	.prefix	= XATTR_NAME_NFSV4_ACL,
	.list	= nfs4_xattr_list_nfs4_acl,
	.get	= nfs4_xattr_get_nfs4_acl,
	.set	= nfs4_xattr_set_nfs4_acl,
};

const struct xattr_handler *nfs4_xattr_handlers[] = {
	&nfs4_xattr_nfs4_acl_handler,
	NULL
};

L
Linus Torvalds 已提交
5715 5716 5717 5718 5719
/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */