nfs4xdr.c 68.0 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 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
/*
 *  fs/nfs/nfs4xdr.c
 *
 *  Server-side XDR 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.
 *
 * TODO: Neil Brown made the following observation:  We currently
 * initially reserve NFSD_BUFSIZE space on the transmit queue and
 * never release any of that until the request is complete.
 * It would be good to calculate a new maximum response size while
 * decoding the COMPOUND, and call svc_reserve with this number
 * at the end of nfs4svc_decode_compoundargs.
 */

#include <linux/param.h>
#include <linux/smp.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/nfsd_idmap.h>
#include <linux/nfs4.h>
#include <linux/nfs4_acl.h>
A
Andy Adamson 已提交
59
#include <linux/sunrpc/gss_api.h>
60
#include <linux/sunrpc/svcauth_gss.h>
L
Linus Torvalds 已提交
61 62 63

#define NFSDDBG_FACILITY		NFSDDBG_XDR

64 65 66 67 68 69 70 71
/*
 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
 * directory in order to indicate to the client that a filesystem boundary is present
 * We use a fixed fsid for a referral
 */
#define NFS4_REFERRAL_FSID_MAJOR	0x8000000ULL
#define NFS4_REFERRAL_FSID_MINOR	0x8000000ULL

72 73
static __be32
check_filename(char *str, int len, __be32 err)
L
Linus Torvalds 已提交
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
{
	int i;

	if (len == 0)
		return nfserr_inval;
	if (isdotent(str, len))
		return err;
	for (i = 0; i < len; i++)
		if (str[i] == '/')
			return err;
	return 0;
}

/*
 * START OF "GENERIC" DECODE ROUTINES.
 *   These may look a little ugly since they are imported from a "generic"
 * set of XDR encode/decode routines which are intended to be shared by
 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 *
 * If the pain of reading these is too great, it should be a straightforward
 * task to translate them into Linux-specific versions which are more
 * consistent with the style used in NFSv2/v3...
 */
#define DECODE_HEAD				\
A
Al Viro 已提交
98
	__be32 *p;				\
99
	__be32 status
L
Linus Torvalds 已提交
100 101 102 103 104
#define DECODE_TAIL				\
	status = 0;				\
out:						\
	return status;				\
xdr_error:					\
105 106
	dprintk("NFSD: xdr error (%s:%d)\n",	\
			__FILE__, __LINE__);	\
L
Linus Torvalds 已提交
107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
	status = nfserr_bad_xdr;		\
	goto out

#define READ32(x)         (x) = ntohl(*p++)
#define READ64(x)         do {			\
	(x) = (u64)ntohl(*p++) << 32;		\
	(x) |= ntohl(*p++);			\
} while (0)
#define READTIME(x)       do {			\
	p++;					\
	(x) = ntohl(*p++);			\
	p++;					\
} while (0)
#define READMEM(x,nbytes) do {			\
	x = (char *)p;				\
	p += XDR_QUADLEN(nbytes);		\
} while (0)
#define SAVEMEM(x,nbytes) do {			\
	if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 		savemem(argp, p, nbytes) :	\
 		(char *)p)) {			\
128 129
		dprintk("NFSD: xdr error (%s:%d)\n", \
				__FILE__, __LINE__); \
L
Linus Torvalds 已提交
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
		goto xdr_error;			\
		}				\
	p += XDR_QUADLEN(nbytes);		\
} while (0)
#define COPYMEM(x,nbytes) do {			\
	memcpy((x), p, nbytes);			\
	p += XDR_QUADLEN(nbytes);		\
} while (0)

/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
#define READ_BUF(nbytes)  do {			\
	if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {	\
		p = argp->p;			\
		argp->p += XDR_QUADLEN(nbytes);	\
	} else if (!(p = read_buf(argp, nbytes))) { \
145 146
		dprintk("NFSD: xdr error (%s:%d)\n", \
				__FILE__, __LINE__); \
L
Linus Torvalds 已提交
147 148 149 150
		goto xdr_error;			\
	}					\
} while (0)

151
static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
L
Linus Torvalds 已提交
152 153 154 155
{
	/* We want more bytes than seem to be available.
	 * Maybe we need a new page, maybe we have just run out
	 */
156
	unsigned int avail = (char *)argp->end - (char *)argp->p;
A
Al Viro 已提交
157
	__be32 *p;
L
Linus Torvalds 已提交
158 159 160 161 162 163 164 165
	if (avail + argp->pagelen < nbytes)
		return NULL;
	if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
		return NULL;
	/* ok, we can do it with the current plus the next page */
	if (nbytes <= sizeof(argp->tmp))
		p = argp->tmp;
	else {
J
Jesper Juhl 已提交
166
		kfree(argp->tmpp);
L
Linus Torvalds 已提交
167 168 169 170 171
		p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
		if (!p)
			return NULL;
		
	}
172 173 174 175 176
	/*
	 * The following memcpy is safe because read_buf is always
	 * called with nbytes > avail, and the two cases above both
	 * guarantee p points to at least nbytes bytes.
	 */
L
Linus Torvalds 已提交
177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
	memcpy(p, argp->p, avail);
	/* step to next page */
	argp->p = page_address(argp->pagelist[0]);
	argp->pagelist++;
	if (argp->pagelen < PAGE_SIZE) {
		argp->end = p + (argp->pagelen>>2);
		argp->pagelen = 0;
	} else {
		argp->end = p + (PAGE_SIZE>>2);
		argp->pagelen -= PAGE_SIZE;
	}
	memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
	argp->p += XDR_QUADLEN(nbytes - avail);
	return p;
}

static int
defer_free(struct nfsd4_compoundargs *argp,
		void (*release)(const void *), void *p)
{
	struct tmpbuf *tb;

	tb = kmalloc(sizeof(*tb), GFP_KERNEL);
	if (!tb)
		return -ENOMEM;
	tb->buf = p;
	tb->release = release;
	tb->next = argp->to_free;
	argp->to_free = tb;
	return 0;
}

A
Al Viro 已提交
209
static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
L
Linus Torvalds 已提交
210 211
{
	if (p == argp->tmp) {
212 213 214
		p = kmalloc(nbytes, GFP_KERNEL);
		if (!p)
			return NULL;
L
Linus Torvalds 已提交
215 216
		memcpy(p, argp->tmp, nbytes);
	} else {
E
Eric Sesterhenn 已提交
217
		BUG_ON(p != argp->tmpp);
L
Linus Torvalds 已提交
218 219 220
		argp->tmpp = NULL;
	}
	if (defer_free(argp, kfree, p)) {
221
		kfree(p);
L
Linus Torvalds 已提交
222 223 224 225 226
		return NULL;
	} else
		return (char *)p;
}

227
static __be32
L
Linus Torvalds 已提交
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
{
	u32 bmlen;
	DECODE_HEAD;

	bmval[0] = 0;
	bmval[1] = 0;

	READ_BUF(4);
	READ32(bmlen);
	if (bmlen > 1000)
		goto xdr_error;

	READ_BUF(bmlen << 2);
	if (bmlen > 0)
		READ32(bmval[0]);
	if (bmlen > 1)
		READ32(bmval[1]);

	DECODE_TAIL;
}

250
static __be32
L
Linus Torvalds 已提交
251 252 253 254 255 256
nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
    struct nfs4_acl **acl)
{
	int expected_len, len = 0;
	u32 dummy32;
	char *buf;
257
	int host_err;
L
Linus Torvalds 已提交
258 259 260 261 262 263 264

	DECODE_HEAD;
	iattr->ia_valid = 0;
	if ((status = nfsd4_decode_bitmap(argp, bmval)))
		return status;

	/*
265
	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
L
Linus Torvalds 已提交
266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282
	 * read-only attributes return ERR_INVAL.
	 */
	if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
		return nfserr_attrnotsupp;
	if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
		return nfserr_inval;

	READ_BUF(4);
	READ32(expected_len);

	if (bmval[0] & FATTR4_WORD0_SIZE) {
		READ_BUF(8);
		len += 8;
		READ64(iattr->ia_size);
		iattr->ia_valid |= ATTR_SIZE;
	}
	if (bmval[0] & FATTR4_WORD0_ACL) {
283 284
		int nace;
		struct nfs4_ace *ace;
L
Linus Torvalds 已提交
285 286 287 288

		READ_BUF(4); len += 4;
		READ32(nace);

289 290 291 292
		if (nace > NFS4_ACL_MAX)
			return nfserr_resource;

		*acl = nfs4_acl_new(nace);
L
Linus Torvalds 已提交
293
		if (*acl == NULL) {
294
			host_err = -ENOMEM;
L
Linus Torvalds 已提交
295 296
			goto out_nfserr;
		}
297
		defer_free(argp, kfree, *acl);
L
Linus Torvalds 已提交
298

299 300
		(*acl)->naces = nace;
		for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
L
Linus Torvalds 已提交
301
			READ_BUF(16); len += 16;
302 303 304
			READ32(ace->type);
			READ32(ace->flag);
			READ32(ace->access_mask);
L
Linus Torvalds 已提交
305 306 307 308
			READ32(dummy32);
			READ_BUF(dummy32);
			len += XDR_QUADLEN(dummy32) << 2;
			READMEM(buf, dummy32);
309
			ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
310
			host_err = 0;
311 312 313
			if (ace->whotype != NFS4_ACL_WHO_NAMED)
				ace->who = 0;
			else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
314
				host_err = nfsd_map_name_to_gid(argp->rqstp,
315
						buf, dummy32, &ace->who);
L
Linus Torvalds 已提交
316
			else
317
				host_err = nfsd_map_name_to_uid(argp->rqstp,
318
						buf, dummy32, &ace->who);
319
			if (host_err)
L
Linus Torvalds 已提交
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
				goto out_nfserr;
		}
	} else
		*acl = NULL;
	if (bmval[1] & FATTR4_WORD1_MODE) {
		READ_BUF(4);
		len += 4;
		READ32(iattr->ia_mode);
		iattr->ia_mode &= (S_IFMT | S_IALLUGO);
		iattr->ia_valid |= ATTR_MODE;
	}
	if (bmval[1] & FATTR4_WORD1_OWNER) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		READ_BUF(dummy32);
		len += (XDR_QUADLEN(dummy32) << 2);
		READMEM(buf, dummy32);
338
		if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
L
Linus Torvalds 已提交
339 340 341 342 343 344 345 346 347 348
			goto out_nfserr;
		iattr->ia_valid |= ATTR_UID;
	}
	if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		READ_BUF(dummy32);
		len += (XDR_QUADLEN(dummy32) << 2);
		READMEM(buf, dummy32);
349
		if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
L
Linus Torvalds 已提交
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410
			goto out_nfserr;
		iattr->ia_valid |= ATTR_GID;
	}
	if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		switch (dummy32) {
		case NFS4_SET_TO_CLIENT_TIME:
			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
			   all 32 bits of 'nseconds'. */
			READ_BUF(12);
			len += 12;
			READ32(dummy32);
			if (dummy32)
				return nfserr_inval;
			READ32(iattr->ia_atime.tv_sec);
			READ32(iattr->ia_atime.tv_nsec);
			if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
				return nfserr_inval;
			iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
			break;
		case NFS4_SET_TO_SERVER_TIME:
			iattr->ia_valid |= ATTR_ATIME;
			break;
		default:
			goto xdr_error;
		}
	}
	if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		switch (dummy32) {
		case NFS4_SET_TO_CLIENT_TIME:
			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
			   all 32 bits of 'nseconds'. */
			READ_BUF(12);
			len += 12;
			READ32(dummy32);
			if (dummy32)
				return nfserr_inval;
			READ32(iattr->ia_mtime.tv_sec);
			READ32(iattr->ia_mtime.tv_nsec);
			if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
				return nfserr_inval;
			iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
			break;
		case NFS4_SET_TO_SERVER_TIME:
			iattr->ia_valid |= ATTR_MTIME;
			break;
		default:
			goto xdr_error;
		}
	}
	if (len != expected_len)
		goto xdr_error;

	DECODE_TAIL;

out_nfserr:
411
	status = nfserrno(host_err);
L
Linus Torvalds 已提交
412 413 414
	goto out;
}

415
static __be32
L
Linus Torvalds 已提交
416 417 418 419 420 421 422 423 424 425
nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(access->ac_req_access);

	DECODE_TAIL;
}

426
static __be32
L
Linus Torvalds 已提交
427 428 429 430 431 432 433 434 435 436 437 438 439 440
nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
{
	DECODE_HEAD;

	close->cl_stateowner = NULL;
	READ_BUF(4 + sizeof(stateid_t));
	READ32(close->cl_seqid);
	READ32(close->cl_stateid.si_generation);
	COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));

	DECODE_TAIL;
}


441
static __be32
L
Linus Torvalds 已提交
442 443 444 445 446 447 448 449 450 451 452
nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
{
	DECODE_HEAD;

	READ_BUF(12);
	READ64(commit->co_offset);
	READ32(commit->co_count);

	DECODE_TAIL;
}

453
static __be32
L
Linus Torvalds 已提交
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492
nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(create->cr_type);
	switch (create->cr_type) {
	case NF4LNK:
		READ_BUF(4);
		READ32(create->cr_linklen);
		READ_BUF(create->cr_linklen);
		SAVEMEM(create->cr_linkname, create->cr_linklen);
		break;
	case NF4BLK:
	case NF4CHR:
		READ_BUF(8);
		READ32(create->cr_specdata1);
		READ32(create->cr_specdata2);
		break;
	case NF4SOCK:
	case NF4FIFO:
	case NF4DIR:
	default:
		break;
	}

	READ_BUF(4);
	READ32(create->cr_namelen);
	READ_BUF(create->cr_namelen);
	SAVEMEM(create->cr_name, create->cr_namelen);
	if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
		return status;

	if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
		goto out;

	DECODE_TAIL;
}

493
static inline __be32
L
Linus Torvalds 已提交
494 495 496 497 498 499 500 501 502 503 504
nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t));
	READ32(dr->dr_stateid.si_generation);
	COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));

	DECODE_TAIL;
}

505
static inline __be32
L
Linus Torvalds 已提交
506 507 508 509 510
nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
{
	return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
}

511
static __be32
L
Linus Torvalds 已提交
512 513 514 515 516 517 518 519 520 521 522 523 524 525
nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(link->li_namelen);
	READ_BUF(link->li_namelen);
	SAVEMEM(link->li_name, link->li_namelen);
	if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
		return status;

	DECODE_TAIL;
}

526
static __be32
L
Linus Torvalds 已提交
527 528 529 530
nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
{
	DECODE_HEAD;

531
	lock->lk_replay_owner = NULL;
L
Linus Torvalds 已提交
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564
	/*
	* type, reclaim(boolean), offset, length, new_lock_owner(boolean)
	*/
	READ_BUF(28);
	READ32(lock->lk_type);
	if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ32(lock->lk_reclaim);
	READ64(lock->lk_offset);
	READ64(lock->lk_length);
	READ32(lock->lk_is_new);

	if (lock->lk_is_new) {
		READ_BUF(36);
		READ32(lock->lk_new_open_seqid);
		READ32(lock->lk_new_open_stateid.si_generation);

		COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
		READ32(lock->lk_new_lock_seqid);
		COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
		READ32(lock->lk_new_owner.len);
		READ_BUF(lock->lk_new_owner.len);
		READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
	} else {
		READ_BUF(20);
		READ32(lock->lk_old_lock_stateid.si_generation);
		COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
		READ32(lock->lk_old_lock_seqid);
	}

	DECODE_TAIL;
}

565
static __be32
L
Linus Torvalds 已提交
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583
nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
{
	DECODE_HEAD;
		        
	READ_BUF(32);
	READ32(lockt->lt_type);
	if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ64(lockt->lt_offset);
	READ64(lockt->lt_length);
	COPYMEM(&lockt->lt_clientid, 8);
	READ32(lockt->lt_owner.len);
	READ_BUF(lockt->lt_owner.len);
	READMEM(lockt->lt_owner.data, lockt->lt_owner.len);

	DECODE_TAIL;
}

584
static __be32
L
Linus Torvalds 已提交
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602
nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
{
	DECODE_HEAD;

	locku->lu_stateowner = NULL;
	READ_BUF(24 + sizeof(stateid_t));
	READ32(locku->lu_type);
	if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ32(locku->lu_seqid);
	READ32(locku->lu_stateid.si_generation);
	COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ64(locku->lu_offset);
	READ64(locku->lu_length);

	DECODE_TAIL;
}

603
static __be32
L
Linus Torvalds 已提交
604 605 606 607 608 609 610 611 612 613 614 615 616 617
nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(lookup->lo_len);
	READ_BUF(lookup->lo_len);
	SAVEMEM(lookup->lo_name, lookup->lo_len);
	if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
		return status;

	DECODE_TAIL;
}

618
static __be32
L
Linus Torvalds 已提交
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
	DECODE_HEAD;

	memset(open->op_bmval, 0, sizeof(open->op_bmval));
	open->op_iattr.ia_valid = 0;
	open->op_stateowner = NULL;

	/* seqid, share_access, share_deny, clientid, ownerlen */
	READ_BUF(16 + sizeof(clientid_t));
	READ32(open->op_seqid);
	READ32(open->op_share_access);
	READ32(open->op_share_deny);
	COPYMEM(&open->op_clientid, sizeof(clientid_t));
	READ32(open->op_owner.len);

	/* owner, open_flag */
	READ_BUF(open->op_owner.len + 4);
	SAVEMEM(open->op_owner.data, open->op_owner.len);
	READ32(open->op_create);
	switch (open->op_create) {
	case NFS4_OPEN_NOCREATE:
		break;
	case NFS4_OPEN_CREATE:
		READ_BUF(4);
		READ32(open->op_createmode);
		switch (open->op_createmode) {
		case NFS4_CREATE_UNCHECKED:
		case NFS4_CREATE_GUARDED:
			if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
				goto out;
			break;
		case NFS4_CREATE_EXCLUSIVE:
			READ_BUF(8);
			COPYMEM(open->op_verf.data, 8);
			break;
		default:
			goto xdr_error;
		}
		break;
	default:
		goto xdr_error;
	}

	/* open_claim */
	READ_BUF(4);
	READ32(open->op_claim_type);
	switch (open->op_claim_type) {
	case NFS4_OPEN_CLAIM_NULL:
	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
		READ_BUF(4);
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
			return status;
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
		READ_BUF(4);
		READ32(open->op_delegate_type);
		break;
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
		READ_BUF(sizeof(stateid_t) + 4);
		COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
			return status;
		break;
	default:
		goto xdr_error;
	}

	DECODE_TAIL;
}

696
static __be32
L
Linus Torvalds 已提交
697 698 699 700 701 702 703 704 705 706 707 708 709
nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
{
	DECODE_HEAD;
		    
	open_conf->oc_stateowner = NULL;
	READ_BUF(4 + sizeof(stateid_t));
	READ32(open_conf->oc_req_stateid.si_generation);
	COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ32(open_conf->oc_seqid);
						        
	DECODE_TAIL;
}

710
static __be32
L
Linus Torvalds 已提交
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
{
	DECODE_HEAD;
		    
	open_down->od_stateowner = NULL;
	READ_BUF(12 + sizeof(stateid_t));
	READ32(open_down->od_stateid.si_generation);
	COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ32(open_down->od_seqid);
	READ32(open_down->od_share_access);
	READ32(open_down->od_share_deny);
						        
	DECODE_TAIL;
}

726
static __be32
L
Linus Torvalds 已提交
727 728 729 730 731 732 733 734 735 736 737 738 739 740
nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(putfh->pf_fhlen);
	if (putfh->pf_fhlen > NFS4_FHSIZE)
		goto xdr_error;
	READ_BUF(putfh->pf_fhlen);
	SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);

	DECODE_TAIL;
}

741
static __be32
L
Linus Torvalds 已提交
742 743 744 745 746 747 748 749 750 751 752 753 754
nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t) + 12);
	READ32(read->rd_stateid.si_generation);
	COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ64(read->rd_offset);
	READ32(read->rd_length);

	DECODE_TAIL;
}

755
static __be32
L
Linus Torvalds 已提交
756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
{
	DECODE_HEAD;

	READ_BUF(24);
	READ64(readdir->rd_cookie);
	COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
	READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
	READ32(readdir->rd_maxcount);
	if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
		goto out;

	DECODE_TAIL;
}

771
static __be32
L
Linus Torvalds 已提交
772 773 774 775 776 777 778 779 780 781 782 783 784 785
nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(remove->rm_namelen);
	READ_BUF(remove->rm_namelen);
	SAVEMEM(remove->rm_name, remove->rm_namelen);
	if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
		return status;

	DECODE_TAIL;
}

786
static __be32
L
Linus Torvalds 已提交
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(rename->rn_snamelen);
	READ_BUF(rename->rn_snamelen + 4);
	SAVEMEM(rename->rn_sname, rename->rn_snamelen);
	READ32(rename->rn_tnamelen);
	READ_BUF(rename->rn_tnamelen);
	SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
	if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
		return status;
	if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
		return status;

	DECODE_TAIL;
}

806
static __be32
L
Linus Torvalds 已提交
807 808 809 810 811 812 813 814 815 816
nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
{
	DECODE_HEAD;

	READ_BUF(sizeof(clientid_t));
	COPYMEM(clientid, sizeof(clientid_t));

	DECODE_TAIL;
}

A
Andy Adamson 已提交
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
		     struct nfsd4_secinfo *secinfo)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(secinfo->si_namelen);
	READ_BUF(secinfo->si_namelen);
	SAVEMEM(secinfo->si_name, secinfo->si_namelen);
	status = check_filename(secinfo->si_name, secinfo->si_namelen,
								nfserr_noent);
	if (status)
		return status;
	DECODE_TAIL;
}

834
static __be32
L
Linus Torvalds 已提交
835 836 837 838 839 840 841 842 843 844 845 846 847
nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t));
	READ32(setattr->sa_stateid.si_generation);
	COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
	if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
		goto out;

	DECODE_TAIL;
}

848
static __be32
L
Linus Torvalds 已提交
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872
nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
{
	DECODE_HEAD;

	READ_BUF(12);
	COPYMEM(setclientid->se_verf.data, 8);
	READ32(setclientid->se_namelen);

	READ_BUF(setclientid->se_namelen + 8);
	SAVEMEM(setclientid->se_name, setclientid->se_namelen);
	READ32(setclientid->se_callback_prog);
	READ32(setclientid->se_callback_netid_len);

	READ_BUF(setclientid->se_callback_netid_len + 4);
	SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
	READ32(setclientid->se_callback_addr_len);

	READ_BUF(setclientid->se_callback_addr_len + 4);
	SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
	READ32(setclientid->se_callback_ident);

	DECODE_TAIL;
}

873
static __be32
L
Linus Torvalds 已提交
874 875 876 877 878 879 880 881 882 883 884 885
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
{
	DECODE_HEAD;

	READ_BUF(8 + sizeof(nfs4_verifier));
	COPYMEM(&scd_c->sc_clientid, 8);
	COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));

	DECODE_TAIL;
}

/* Also used for NVERIFY */
886
static __be32
L
Linus Torvalds 已提交
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
{
#if 0
	struct nfsd4_compoundargs save = {
		.p = argp->p,
		.end = argp->end,
		.rqstp = argp->rqstp,
	};
	u32             ve_bmval[2];
	struct iattr    ve_iattr;           /* request */
	struct nfs4_acl *ve_acl;            /* request */
#endif
	DECODE_HEAD;

	if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
		goto out;

	/* For convenience's sake, we compare raw xdr'd attributes in
	 * nfsd4_proc_verify; however we still decode here just to return
	 * correct error in case of bad xdr. */
#if 0
	status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
	if (status == nfserr_inval) {
		status = nfserrno(status);
		goto out;
	}
#endif
	READ_BUF(4);
	READ32(verify->ve_attrlen);
	READ_BUF(verify->ve_attrlen);
	SAVEMEM(verify->ve_attrval, verify->ve_attrlen);

	DECODE_TAIL;
}

922
static __be32
L
Linus Torvalds 已提交
923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
{
	int avail;
	int v;
	int len;
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_opaque_t) + 20);
	READ32(write->wr_stateid.si_generation);
	COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ64(write->wr_offset);
	READ32(write->wr_stable_how);
	if (write->wr_stable_how > 2)
		goto xdr_error;
	READ32(write->wr_buflen);

	/* Sorry .. no magic macros for this.. *
	 * READ_BUF(write->wr_buflen);
	 * SAVEMEM(write->wr_buf, write->wr_buflen);
	 */
	avail = (char*)argp->end - (char*)argp->p;
	if (avail + argp->pagelen < write->wr_buflen) {
945 946
		dprintk("NFSD: xdr error (%s:%d)\n",
				__FILE__, __LINE__);
L
Linus Torvalds 已提交
947 948
		goto xdr_error;
	}
949 950
	argp->rqstp->rq_vec[0].iov_base = p;
	argp->rqstp->rq_vec[0].iov_len = avail;
L
Linus Torvalds 已提交
951 952
	v = 0;
	len = write->wr_buflen;
953 954
	while (len > argp->rqstp->rq_vec[v].iov_len) {
		len -= argp->rqstp->rq_vec[v].iov_len;
L
Linus Torvalds 已提交
955
		v++;
956
		argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
L
Linus Torvalds 已提交
957 958
		argp->pagelist++;
		if (argp->pagelen >= PAGE_SIZE) {
959
			argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
L
Linus Torvalds 已提交
960 961
			argp->pagelen -= PAGE_SIZE;
		} else {
962
			argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
L
Linus Torvalds 已提交
963 964 965
			argp->pagelen -= len;
		}
	}
A
Al Viro 已提交
966 967
	argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
	argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
968
	argp->rqstp->rq_vec[v].iov_len = len;
L
Linus Torvalds 已提交
969 970 971 972 973
	write->wr_vlen = v+1;

	DECODE_TAIL;
}

974
static __be32
L
Linus Torvalds 已提交
975 976 977 978 979 980 981 982 983 984 985 986 987
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
{
	DECODE_HEAD;

	READ_BUF(12);
	COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
	READ32(rlockowner->rl_owner.len);
	READ_BUF(rlockowner->rl_owner.len);
	READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);

	DECODE_TAIL;
}

988 989 990 991 992 993
static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
{
	return nfs_ok;
}

994 995 996 997 998 999
static __be32
nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
{
	return nfserr_opnotsupp;
}

1000 1001 1002 1003 1004 1005 1006
typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);

static nfsd4_dec nfsd4_dec_ops[] = {
	[OP_ACCESS]		(nfsd4_dec)nfsd4_decode_access,
	[OP_CLOSE]		(nfsd4_dec)nfsd4_decode_close,
	[OP_COMMIT]		(nfsd4_dec)nfsd4_decode_commit,
	[OP_CREATE]		(nfsd4_dec)nfsd4_decode_create,
1007
	[OP_DELEGPURGE]		(nfsd4_dec)nfsd4_decode_notsupp,
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	[OP_DELEGRETURN]	(nfsd4_dec)nfsd4_decode_delegreturn,
	[OP_GETATTR]		(nfsd4_dec)nfsd4_decode_getattr,
	[OP_GETFH]		(nfsd4_dec)nfsd4_decode_noop,
	[OP_LINK]		(nfsd4_dec)nfsd4_decode_link,
	[OP_LOCK]		(nfsd4_dec)nfsd4_decode_lock,
	[OP_LOCKT]		(nfsd4_dec)nfsd4_decode_lockt,
	[OP_LOCKU]		(nfsd4_dec)nfsd4_decode_locku,
	[OP_LOOKUP]		(nfsd4_dec)nfsd4_decode_lookup,
	[OP_LOOKUPP]		(nfsd4_dec)nfsd4_decode_noop,
	[OP_NVERIFY]		(nfsd4_dec)nfsd4_decode_verify,
	[OP_OPEN]		(nfsd4_dec)nfsd4_decode_open,
1019
	[OP_OPENATTR]		(nfsd4_dec)nfsd4_decode_notsupp,
1020 1021 1022
	[OP_OPEN_CONFIRM]	(nfsd4_dec)nfsd4_decode_open_confirm,
	[OP_OPEN_DOWNGRADE]	(nfsd4_dec)nfsd4_decode_open_downgrade,
	[OP_PUTFH]		(nfsd4_dec)nfsd4_decode_putfh,
1023
	[OP_PUTPUBFH]		(nfsd4_dec)nfsd4_decode_notsupp,
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
	[OP_PUTROOTFH]		(nfsd4_dec)nfsd4_decode_noop,
	[OP_READ]		(nfsd4_dec)nfsd4_decode_read,
	[OP_READDIR]		(nfsd4_dec)nfsd4_decode_readdir,
	[OP_READLINK]		(nfsd4_dec)nfsd4_decode_noop,
	[OP_REMOVE]		(nfsd4_dec)nfsd4_decode_remove,
	[OP_RENAME]		(nfsd4_dec)nfsd4_decode_rename,
	[OP_RENEW]		(nfsd4_dec)nfsd4_decode_renew,
	[OP_RESTOREFH]		(nfsd4_dec)nfsd4_decode_noop,
	[OP_SAVEFH]		(nfsd4_dec)nfsd4_decode_noop,
	[OP_SECINFO]		(nfsd4_dec)nfsd4_decode_secinfo,
	[OP_SETATTR]		(nfsd4_dec)nfsd4_decode_setattr,
	[OP_SETCLIENTID]	(nfsd4_dec)nfsd4_decode_setclientid,
	[OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_setclientid_confirm,
	[OP_VERIFY]		(nfsd4_dec)nfsd4_decode_verify,
	[OP_WRITE]		(nfsd4_dec)nfsd4_decode_write,
	[OP_RELEASE_LOCKOWNER]	(nfsd4_dec)nfsd4_decode_release_lockowner,
};

1042
static __be32
L
Linus Torvalds 已提交
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
	DECODE_HEAD;
	struct nfsd4_op *op;
	int i;

	/*
	 * XXX: According to spec, we should check the tag
	 * for UTF-8 compliance.  I'm postponing this for
	 * now because it seems that some clients do use
	 * binary tags.
	 */
	READ_BUF(4);
	READ32(argp->taglen);
	READ_BUF(argp->taglen + 8);
	SAVEMEM(argp->tag, argp->taglen);
	READ32(argp->minorversion);
	READ32(argp->opcnt);

	if (argp->taglen > NFSD4_MAX_TAGLEN)
		goto xdr_error;
	if (argp->opcnt > 100)
		goto xdr_error;

1067
	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
L
Linus Torvalds 已提交
1068 1069 1070
		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
		if (!argp->ops) {
			argp->ops = argp->iops;
1071
			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
L
Linus Torvalds 已提交
1072 1073 1074 1075
			goto xdr_error;
		}
	}

1076 1077 1078
	if (argp->minorversion != 0)
		argp->opcnt = 0;

L
Linus Torvalds 已提交
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
	for (i = 0; i < argp->opcnt; i++) {
		op = &argp->ops[i];
		op->replay = NULL;

		/*
		 * We can't use READ_BUF() here because we need to handle
		 * a missing opcode as an OP_WRITE + 1. So we need to check
		 * to see if we're truly at the end of our buffer or if there
		 * is another page we need to flip to.
		 */

		if (argp->p == argp->end) {
			if (argp->pagelen < 4) {
				/* There isn't an opcode still on the wire */
				op->opnum = OP_WRITE + 1;
				op->status = nfserr_bad_xdr;
				argp->opcnt = i+1;
				break;
			}

			/*
			 * False alarm. We just hit a page boundary, but there
			 * is still data available.  Move pointer across page
			 * boundary.  *snip from READ_BUF*
			 */
			argp->p = page_address(argp->pagelist[0]);
			argp->pagelist++;
			if (argp->pagelen < PAGE_SIZE) {
				argp->end = p + (argp->pagelen>>2);
				argp->pagelen = 0;
			} else {
				argp->end = p + (PAGE_SIZE>>2);
				argp->pagelen -= PAGE_SIZE;
			}
		}
		op->opnum = ntohl(*argp->p++);

1116 1117 1118
		if (op->opnum >= OP_ACCESS && op->opnum < ARRAY_SIZE(nfsd4_dec_ops))
			op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
		else {
L
Linus Torvalds 已提交
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
			op->opnum = OP_ILLEGAL;
			op->status = nfserr_op_illegal;
		}

		if (op->status) {
			argp->opcnt = i+1;
			break;
		}
	}

	DECODE_TAIL;
}
/*
 * END OF "GENERIC" DECODE ROUTINES.
 */

/*
 * START OF "GENERIC" ENCODE ROUTINES.
 *   These may look a little ugly since they are imported from a "generic"
 * set of XDR encode/decode routines which are intended to be shared by
 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 *
 * If the pain of reading these is too great, it should be a straightforward
 * task to translate them into Linux-specific versions which are more
 * consistent with the style used in NFSv2/v3...
 */
A
Al Viro 已提交
1145
#define ENCODE_HEAD              __be32 *p
L
Linus Torvalds 已提交
1146 1147 1148 1149 1150 1151

#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((u32)((n) >> 32));				\
	*p++ = htonl((u32)(n));					\
} while (0)
1152
#define WRITEMEM(ptr,nbytes)     do if (nbytes > 0) {		\
L
Linus Torvalds 已提交
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
	memcpy(p, ptr, nbytes);					\
	p += XDR_QUADLEN(nbytes);				\
} while (0)
#define WRITECINFO(c)		do {				\
	*p++ = htonl(c.atomic);					\
	*p++ = htonl(c.before_ctime_sec);				\
	*p++ = htonl(c.before_ctime_nsec);				\
	*p++ = htonl(c.after_ctime_sec);				\
	*p++ = htonl(c.after_ctime_nsec);				\
} while (0)

#define RESERVE_SPACE(nbytes)	do {				\
	p = resp->p;						\
	BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);		\
} while (0)
#define ADJUST_ARGS()		resp->p = p

/*
 * Header routine to setup seqid operation replay cache
 */
#define ENCODE_SEQID_OP_HEAD					\
A
Al Viro 已提交
1175 1176
	__be32 *p;						\
	__be32 *save;						\
L
Linus Torvalds 已提交
1177 1178 1179 1180
								\
	save = resp->p;

/*
N
NeilBrown 已提交
1181 1182 1183 1184
 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
 * is where sequence id's are incremented, and the replay cache is filled.
 * Note that we increment sequence id's here, at the last moment, so we're sure
 * we know whether the error to be returned is a sequence id mutating error.
L
Linus Torvalds 已提交
1185 1186 1187 1188
 */

#define ENCODE_SEQID_OP_TAIL(stateowner) do {			\
	if (seqid_mutating_err(nfserr) && stateowner) { 	\
1189
		stateowner->so_seqid++;				\
L
Linus Torvalds 已提交
1190 1191 1192 1193 1194 1195 1196
		stateowner->so_replay.rp_status = nfserr;   	\
		stateowner->so_replay.rp_buflen = 		\
			  (((char *)(resp)->p - (char *)save)); \
		memcpy(stateowner->so_replay.rp_buf, save,      \
 			stateowner->so_replay.rp_buflen); 	\
	} } while (0);

1197 1198 1199
/* Encode as an array of strings the string given with components
 * seperated @sep.
 */
1200
static __be32 nfsd4_encode_components(char sep, char *components,
A
Al Viro 已提交
1201
				   __be32 **pp, int *buflen)
1202
{
A
Al Viro 已提交
1203 1204
	__be32 *p = *pp;
	__be32 *countp = p;
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
	int strlen, count=0;
	char *str, *end;

	dprintk("nfsd4_encode_components(%s)\n", components);
	if ((*buflen -= 4) < 0)
		return nfserr_resource;
	WRITE32(0); /* We will fill this in with @count later */
	end = str = components;
	while (*end) {
		for (; *end && (*end != sep); end++)
			; /* Point to end of component */
		strlen = end - str;
		if (strlen) {
			if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
				return nfserr_resource;
			WRITE32(strlen);
			WRITEMEM(str, strlen);
			count++;
		}
		else
			end++;
		str = end;
	}
	*pp = p;
	p = countp;
	WRITE32(count);
	return 0;
}

/*
 * encode a location element of a fs_locations structure
 */
1237
static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
A
Al Viro 已提交
1238
				    __be32 **pp, int *buflen)
1239
{
1240
	__be32 status;
A
Al Viro 已提交
1241
	__be32 *p = *pp;
1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257

	status = nfsd4_encode_components(':', location->hosts, &p, buflen);
	if (status)
		return status;
	status = nfsd4_encode_components('/', location->path, &p, buflen);
	if (status)
		return status;
	*pp = p;
	return 0;
}

/*
 * Return the path to an export point in the pseudo filesystem namespace
 * Returned string is safe to use as long as the caller holds a reference
 * to @exp.
 */
1258
static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1259 1260 1261 1262 1263
{
	struct svc_fh tmp_fh;
	char *path, *rootpath;

	fh_init(&tmp_fh, NFS4_FHSIZE);
1264
	*stat = exp_pseudoroot(rqstp, &tmp_fh);
1265 1266
	if (*stat)
		return NULL;
1267
	rootpath = tmp_fh.fh_export->ex_pathname;
1268

1269
	path = exp->ex_pathname;
1270 1271

	if (strncmp(path, rootpath, strlen(rootpath))) {
1272
		dprintk("nfsd: fs_locations failed;"
1273
			"%s is not contained in %s\n", path, rootpath);
1274 1275
		*stat = nfserr_notsupp;
		return NULL;
1276 1277 1278 1279 1280 1281 1282 1283
	}

	return path + strlen(rootpath);
}

/*
 *  encode a fs_locations structure
 */
1284
static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1285
				     struct svc_export *exp,
A
Al Viro 已提交
1286
				     __be32 **pp, int *buflen)
1287
{
1288
	__be32 status;
1289
	int i;
A
Al Viro 已提交
1290
	__be32 *p = *pp;
1291
	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1292
	char *root = nfsd4_path(rqstp, exp, &status);
1293

1294 1295
	if (status)
		return status;
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
	status = nfsd4_encode_components('/', root, &p, buflen);
	if (status)
		return status;
	if ((*buflen -= 4) < 0)
		return nfserr_resource;
	WRITE32(fslocs->locations_count);
	for (i=0; i<fslocs->locations_count; i++) {
		status = nfsd4_encode_fs_location4(&fslocs->locations[i],
						   &p, buflen);
		if (status)
			return status;
	}
	*pp = p;
	return 0;
}
L
Linus Torvalds 已提交
1311 1312 1313 1314 1315 1316 1317 1318

static u32 nfs4_ftypes[16] = {
        NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
        NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
        NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
        NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
};

1319
static __be32
L
Linus Torvalds 已提交
1320
nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
A
Al Viro 已提交
1321
			__be32 **p, int *buflen)
L
Linus Torvalds 已提交
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340
{
	int status;

	if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
		return nfserr_resource;
	if (whotype != NFS4_ACL_WHO_NAMED)
		status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
	else if (group)
		status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
	else
		status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
	if (status < 0)
		return nfserrno(status);
	*p = xdr_encode_opaque(*p, NULL, status);
	*buflen -= (XDR_QUADLEN(status) << 2) + 4;
	BUG_ON(*buflen < 0);
	return 0;
}

1341
static inline __be32
A
Al Viro 已提交
1342
nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
L
Linus Torvalds 已提交
1343 1344 1345 1346
{
	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
}

1347
static inline __be32
A
Al Viro 已提交
1348
nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
L
Linus Torvalds 已提交
1349 1350 1351 1352
{
	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
}

1353
static inline __be32
L
Linus Torvalds 已提交
1354
nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
A
Al Viro 已提交
1355
		__be32 **p, int *buflen)
L
Linus Torvalds 已提交
1356 1357 1358 1359
{
	return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
}

1360 1361 1362 1363
#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
			      FATTR4_WORD0_RDATTR_ERROR)
#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID

1364
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
{
	/* As per referral draft:  */
	if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
	    *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
		if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
	            *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
			*rdattr_err = NFSERR_MOVED;
		else
			return nfserr_moved;
	}
	*bmval0 &= WORD0_ABSENT_FS_ATTRS;
	*bmval1 &= WORD1_ABSENT_FS_ATTRS;
	return 0;
}
L
Linus Torvalds 已提交
1379 1380 1381 1382 1383 1384 1385 1386

/*
 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
 * ourselves.
 *
 * @countp is the buffer size in _words_; upon successful return this becomes
 * replaced with the number of words written.
 */
1387
__be32
L
Linus Torvalds 已提交
1388
nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
A
Al Viro 已提交
1389
		struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1390
		struct svc_rqst *rqstp, int ignore_crossmnt)
L
Linus Torvalds 已提交
1391 1392 1393 1394 1395 1396 1397
{
	u32 bmval0 = bmval[0];
	u32 bmval1 = bmval[1];
	struct kstat stat;
	struct svc_fh tempfh;
	struct kstatfs statfs;
	int buflen = *countp << 2;
A
Al Viro 已提交
1398
	__be32 *attrlenp;
L
Linus Torvalds 已提交
1399 1400
	u32 dummy;
	u64 dummy64;
1401
	u32 rdattr_err = 0;
A
Al Viro 已提交
1402
	__be32 *p = buffer;
1403
	__be32 status;
1404
	int err;
L
Linus Torvalds 已提交
1405 1406 1407 1408 1409 1410 1411
	int aclsupport = 0;
	struct nfs4_acl *acl = NULL;

	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
	BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
	BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);

1412 1413 1414 1415 1416 1417
	if (exp->ex_fslocs.migrated) {
		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
		if (status)
			goto out;
	}

1418
	err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1419
	if (err)
L
Linus Torvalds 已提交
1420
		goto out_nfserr;
1421 1422
	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
			FATTR4_WORD0_MAXNAME)) ||
L
Linus Torvalds 已提交
1423 1424
	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
		       FATTR4_WORD1_SPACE_TOTAL))) {
1425 1426
		err = vfs_statfs(dentry, &statfs);
		if (err)
L
Linus Torvalds 已提交
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
			goto out_nfserr;
	}
	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
		fh_init(&tempfh, NFS4_FHSIZE);
		status = fh_compose(&tempfh, exp, dentry, NULL);
		if (status)
			goto out;
		fhp = &tempfh;
	}
	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
1438 1439
		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
		aclsupport = (err == 0);
L
Linus Torvalds 已提交
1440
		if (bmval0 & FATTR4_WORD0_ACL) {
1441
			if (err == -EOPNOTSUPP)
L
Linus Torvalds 已提交
1442
				bmval0 &= ~FATTR4_WORD0_ACL;
1443
			else if (err == -EINVAL) {
L
Linus Torvalds 已提交
1444 1445
				status = nfserr_attrnotsupp;
				goto out;
1446
			} else if (err != 0)
L
Linus Torvalds 已提交
1447 1448 1449
				goto out_nfserr;
		}
	}
1450 1451 1452 1453 1454
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
		if (exp->ex_fslocs.locations == NULL) {
			bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
		}
	}
L
Linus Torvalds 已提交
1455 1456 1457 1458 1459 1460 1461 1462 1463
	if ((buflen -= 16) < 0)
		goto out_resource;

	WRITE32(2);
	WRITE32(bmval0);
	WRITE32(bmval1);
	attrlenp = p++;                /* to be backfilled later */

	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1464
		u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
L
Linus Torvalds 已提交
1465 1466
		if ((buflen -= 12) < 0)
			goto out_resource;
1467 1468 1469 1470
		if (!aclsupport)
			word0 &= ~FATTR4_WORD0_ACL;
		if (!exp->ex_fslocs.locations)
			word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
L
Linus Torvalds 已提交
1471
		WRITE32(2);
1472
		WRITE32(word0);
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
		WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
	}
	if (bmval0 & FATTR4_WORD0_TYPE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
		if (dummy == NF4BAD)
			goto out_serverfault;
		WRITE32(dummy);
	}
	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
N
NeilBrown 已提交
1486
		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
N
NeilBrown 已提交
1487
			WRITE32(NFS4_FH_PERSISTENT);
N
NeilBrown 已提交
1488
		else
N
NeilBrown 已提交
1489
			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
L
Linus Torvalds 已提交
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
	}
	if (bmval0 & FATTR4_WORD0_CHANGE) {
		/*
		 * Note: This _must_ be consistent with the scheme for writing
		 * change_info, so any changes made here must be reflected there
		 * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
		 * macro above.)
		 */
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE32(stat.ctime.tv_sec);
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval0 & FATTR4_WORD0_SIZE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64(stat.size);
	}
	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_FSID) {
		if ((buflen -= 16) < 0)
			goto out_resource;
1526 1527 1528
		if (exp->ex_fslocs.migrated) {
			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
			WRITE64(NFS4_REFERRAL_FSID_MINOR);
1529 1530
		} else switch(fsid_source(fhp)) {
		case FSIDSOURCE_FSID:
L
Linus Torvalds 已提交
1531 1532
			WRITE64((u64)exp->ex_fsid);
			WRITE64((u64)0);
1533 1534
			break;
		case FSIDSOURCE_DEV:
L
Linus Torvalds 已提交
1535 1536 1537 1538
			WRITE32(0);
			WRITE32(MAJOR(stat.dev));
			WRITE32(0);
			WRITE32(MINOR(stat.dev));
1539 1540 1541 1542
			break;
		case FSIDSOURCE_UUID:
			WRITEMEM(exp->ex_uuid, 16);
			break;
L
Linus Torvalds 已提交
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
		}
	}
	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(NFSD_LEASE_TIME);
	}
	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
		if ((buflen -= 4) < 0)
			goto out_resource;
1558
		WRITE32(rdattr_err);
L
Linus Torvalds 已提交
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573
	}
	if (bmval0 & FATTR4_WORD0_ACL) {
		struct nfs4_ace *ace;

		if (acl == NULL) {
			if ((buflen -= 4) < 0)
				goto out_resource;

			WRITE32(0);
			goto out_acl;
		}
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(acl->naces);

1574
		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
L
Linus Torvalds 已提交
1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
			if ((buflen -= 4*3) < 0)
				goto out_resource;
			WRITE32(ace->type);
			WRITE32(ace->flag);
			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
			status = nfsd4_encode_aclname(rqstp, ace->whotype,
				ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
				&p, &buflen);
			if (status == nfserr_resource)
				goto out_resource;
			if (status)
				goto out;
		}
	}
out_acl:
	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(aclsupport ?
			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
	}
	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
		buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
		if (buflen < 0)
			goto out_resource;
		WRITE32(fhp->fh_handle.fh_size);
		WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
	}
	if (bmval0 & FATTR4_WORD0_FILEID) {
		if ((buflen -= 8) < 0)
			goto out_resource;
1626
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
	}
	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_files);
	}
1643 1644 1645 1646 1647 1648 1649
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
		status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
L
Linus Torvalds 已提交
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667
	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64(~(u64)0);
	}
	if (bmval0 & FATTR4_WORD0_MAXLINK) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(255);
	}
	if (bmval0 & FATTR4_WORD0_MAXNAME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
1668
		WRITE32(statfs.f_namelen);
L
Linus Torvalds 已提交
1669 1670 1671 1672
	}
	if (bmval0 & FATTR4_WORD0_MAXREAD) {
		if ((buflen -= 8) < 0)
			goto out_resource;
1673
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
1674 1675 1676 1677
	}
	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
1678
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	}
	if (bmval1 & FATTR4_WORD1_MODE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(stat.mode & S_IALLUGO);
	}
	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(stat.nlink);
	}
	if (bmval1 & FATTR4_WORD1_OWNER) {
		status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
		status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_RAWDEV) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE32((u32) MAJOR(stat.rdev));
		WRITE32((u32) MINOR(stat.rdev));
	}
	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)stat.blocks << 9;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.atime.tv_sec);
		WRITE32(stat.atime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(1);
		WRITE32(0);
	}
	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.ctime.tv_sec);
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.mtime.tv_sec);
		WRITE32(stat.mtime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
		if ((buflen -= 8) < 0)
                	goto out_resource;
1770 1771 1772 1773 1774
		/*
		 * Get parent's attributes if not ignoring crossmount
		 * and this is the root of a cross-mounted filesystem.
		 */
		if (ignore_crossmnt == 0 &&
1775 1776 1777
		    exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
			err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
				exp->ex_path.mnt->mnt_mountpoint, &stat);
1778 1779 1780 1781
			if (err)
				goto out_nfserr;
		}
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
1782 1783 1784 1785 1786 1787
	}
	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
	*countp = p - buffer;
	status = nfs_ok;

out:
1788
	kfree(acl);
L
Linus Torvalds 已提交
1789 1790 1791 1792
	if (fhp == &tempfh)
		fh_put(&tempfh);
	return status;
out_nfserr:
1793
	status = nfserrno(err);
L
Linus Torvalds 已提交
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
	goto out;
out_resource:
	*countp = 0;
	status = nfserr_resource;
	goto out;
out_serverfault:
	status = nfserr_serverfault;
	goto out;
}

1804 1805 1806 1807 1808 1809 1810 1811 1812
static inline int attributes_need_mount(u32 *bmval)
{
	if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
		return 1;
	if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
		return 1;
	return 0;
}

1813
static __be32
L
Linus Torvalds 已提交
1814
nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
A
Al Viro 已提交
1815
		const char *name, int namlen, __be32 *p, int *buflen)
L
Linus Torvalds 已提交
1816 1817 1818
{
	struct svc_export *exp = cd->rd_fhp->fh_export;
	struct dentry *dentry;
1819
	__be32 nfserr;
1820
	int ignore_crossmnt = 0;
L
Linus Torvalds 已提交
1821 1822 1823 1824 1825 1826

	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
	if (IS_ERR(dentry))
		return nfserrno(PTR_ERR(dentry));

	exp_get(exp);
1827 1828 1829 1830 1831 1832 1833
	/*
	 * In the case of a mountpoint, the client may be asking for
	 * attributes that are only properties of the underlying filesystem
	 * as opposed to the cross-mounted file system. In such a case,
	 * we will not follow the cross mount and will fill the attribtutes
	 * directly from the mountpoint dentry.
	 */
1834
	if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1835 1836
		ignore_crossmnt = 1;
	else if (d_mountpoint(dentry)) {
1837 1838
		int err;

A
Andy Adamson 已提交
1839 1840 1841 1842 1843
		/*
		 * Why the heck aren't we just using nfsd_lookup??
		 * Different "."/".." handling?  Something else?
		 * At least, add a comment here to explain....
		 */
1844 1845 1846
		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
		if (err) {
			nfserr = nfserrno(err);
L
Linus Torvalds 已提交
1847 1848
			goto out_put;
		}
A
Andy Adamson 已提交
1849 1850 1851
		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
		if (nfserr)
			goto out_put;
L
Linus Torvalds 已提交
1852 1853 1854

	}
	nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1855
					cd->rd_rqstp, ignore_crossmnt);
L
Linus Torvalds 已提交
1856 1857 1858 1859 1860 1861
out_put:
	dput(dentry);
	exp_put(exp);
	return nfserr;
}

A
Al Viro 已提交
1862
static __be32 *
1863
nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
L
Linus Torvalds 已提交
1864
{
A
Al Viro 已提交
1865
	__be32 *attrlenp;
L
Linus Torvalds 已提交
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879

	if (buflen < 6)
		return NULL;
	*p++ = htonl(2);
	*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
	*p++ = htonl(0);			 /* bmval1 */

	attrlenp = p++;
	*p++ = nfserr;       /* no htonl */
	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
	return p;
}

static int
1880 1881
nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
		    loff_t offset, u64 ino, unsigned int d_type)
L
Linus Torvalds 已提交
1882
{
1883
	struct readdir_cd *ccd = ccdv;
L
Linus Torvalds 已提交
1884 1885
	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
	int buflen;
A
Al Viro 已提交
1886
	__be32 *p = cd->buffer;
1887
	__be32 nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927

	/* In nfsv4, "." and ".." never make it onto the wire.. */
	if (name && isdotent(name, namlen)) {
		cd->common.err = nfs_ok;
		return 0;
	}

	if (cd->offset)
		xdr_encode_hyper(cd->offset, (u64) offset);

	buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
	if (buflen < 0)
		goto fail;

	*p++ = xdr_one;                             /* mark entry present */
	cd->offset = p;                             /* remember pointer */
	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
	p = xdr_encode_array(p, name, namlen);      /* name length & name */

	nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
	switch (nfserr) {
	case nfs_ok:
		p += buflen;
		break;
	case nfserr_resource:
		nfserr = nfserr_toosmall;
		goto fail;
	case nfserr_dropit:
		goto fail;
	default:
		/*
		 * If the client requested the RDATTR_ERROR attribute,
		 * we stuff the error code into this attribute
		 * and continue.  If this attribute was not requested,
		 * then in accordance with the spec, we fail the
		 * entire READDIR operation(!)
		 */
		if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
			goto fail;
		p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1928 1929
		if (p == NULL) {
			nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
1930
			goto fail;
1931
		}
L
Linus Torvalds 已提交
1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
	}
	cd->buflen -= (p - cd->buffer);
	cd->buffer = p;
	cd->common.err = nfs_ok;
	return 0;
fail:
	cd->common.err = nfserr;
	return -EINVAL;
}

static void
1943
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
L
Linus Torvalds 已提交
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8);
		WRITE32(access->ac_supported);
		WRITE32(access->ac_resp_access);
		ADJUST_ARGS();
	}
}

static void
1956
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
L
Linus Torvalds 已提交
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(close->cl_stateid.si_generation);
		WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}
	ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
}


static void
1971
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
L
Linus Torvalds 已提交
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8);
		WRITEMEM(commit->co_verf.data, 8);
		ADJUST_ARGS();
	}
}

static void
1983
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
L
Linus Torvalds 已提交
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(32);
		WRITECINFO(create->cr_cinfo);
		WRITE32(2);
		WRITE32(create->cr_bmval[0]);
		WRITE32(create->cr_bmval[1]);
		ADJUST_ARGS();
	}
}

1997 1998
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
L
Linus Torvalds 已提交
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
{
	struct svc_fh *fhp = getattr->ga_fhp;
	int buflen;

	if (nfserr)
		return nfserr;

	buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
	nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
				    resp->p, &buflen, getattr->ga_bmval,
2009
				    resp->rqstp, 0);
L
Linus Torvalds 已提交
2010 2011 2012 2013 2014 2015
	if (!nfserr)
		resp->p += buflen;
	return nfserr;
}

static void
2016
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
L
Linus Torvalds 已提交
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055
{
	unsigned int len;
	ENCODE_HEAD;

	if (!nfserr) {
		len = fhp->fh_handle.fh_size;
		RESERVE_SPACE(len + 4);
		WRITE32(len);
		WRITEMEM(&fhp->fh_handle.fh_base, len);
		ADJUST_ARGS();
	}
}

/*
* Including all fields other than the name, a LOCK4denied structure requires
*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static void
nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
{
	ENCODE_HEAD;

	RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
	WRITE64(ld->ld_start);
	WRITE64(ld->ld_length);
	WRITE32(ld->ld_type);
	if (ld->ld_sop) {
		WRITEMEM(&ld->ld_clientid, 8);
		WRITE32(ld->ld_sop->so_owner.len);
		WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
		kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
	ADJUST_ARGS();
}

static void
2056
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
L
Linus Torvalds 已提交
2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(4 + sizeof(stateid_t));
		WRITE32(lock->lk_resp_stateid.si_generation);
		WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	} else if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lock->lk_denied);

2068
	ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
L
Linus Torvalds 已提交
2069 2070 2071
}

static void
2072
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
L
Linus Torvalds 已提交
2073 2074 2075 2076 2077 2078
{
	if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
}

static void
2079
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
L
Linus Torvalds 已提交
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(locku->lu_stateid.si_generation);
		WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}
				        
	ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
}


static void
2095
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
L
Linus Torvalds 已提交
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(20);
		WRITECINFO(link->li_cinfo);
		ADJUST_ARGS();
	}
}


static void
2108
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
L
Linus Torvalds 已提交
2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131
{
	ENCODE_SEQID_OP_HEAD;

	if (nfserr)
		goto out;

	RESERVE_SPACE(36 + sizeof(stateid_t));
	WRITE32(open->op_stateid.si_generation);
	WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
	WRITECINFO(open->op_cinfo);
	WRITE32(open->op_rflags);
	WRITE32(2);
	WRITE32(open->op_bmval[0]);
	WRITE32(open->op_bmval[1]);
	WRITE32(open->op_delegate_type);
	ADJUST_ARGS();

	switch (open->op_delegate_type) {
	case NFS4_OPEN_DELEGATE_NONE:
		break;
	case NFS4_OPEN_DELEGATE_READ:
		RESERVE_SPACE(20 + sizeof(stateid_t));
		WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2132
		WRITE32(open->op_recall);
L
Linus Torvalds 已提交
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	case NFS4_OPEN_DELEGATE_WRITE:
		RESERVE_SPACE(32 + sizeof(stateid_t));
		WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
		WRITE32(0);

		/*
		 * TODO: space_limit's in delegations
		 */
		WRITE32(NFS4_LIMIT_SIZE);
		WRITE32(~(u32)0);
		WRITE32(~(u32)0);

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
	ENCODE_SEQID_OP_TAIL(open->op_stateowner);
}

static void
2173
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
L
Linus Torvalds 已提交
2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
{
	ENCODE_SEQID_OP_HEAD;
				        
	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(oc->oc_resp_stateid.si_generation);
		WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}

	ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
}

static void
2188
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
L
Linus Torvalds 已提交
2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201
{
	ENCODE_SEQID_OP_HEAD;
				        
	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(od->od_stateid.si_generation);
		WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}

	ENCODE_SEQID_OP_TAIL(od->od_stateowner);
}

2202 2203
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2204
		  struct nfsd4_read *read)
L
Linus Torvalds 已提交
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
{
	u32 eof;
	int v, pn;
	unsigned long maxcount; 
	long len;
	ENCODE_HEAD;

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

	RESERVE_SPACE(8); /* eof flag and byte count */

2219
	maxcount = svc_max_payload(resp->rqstp);
L
Linus Torvalds 已提交
2220 2221 2222 2223 2224 2225
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	len = maxcount;
	v = 0;
	while (len > 0) {
2226
		pn = resp->rqstp->rq_resused++;
2227
		resp->rqstp->rq_vec[v].iov_base =
2228
			page_address(resp->rqstp->rq_respages[pn]);
2229
		resp->rqstp->rq_vec[v].iov_len =
2230
			len < PAGE_SIZE ? len : PAGE_SIZE;
L
Linus Torvalds 已提交
2231 2232 2233 2234 2235 2236
		v++;
		len -= PAGE_SIZE;
	}
	read->rd_vlen = v;

	nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2237
			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
L
Linus Torvalds 已提交
2238 2239 2240 2241 2242 2243
			&maxcount);

	if (nfserr == nfserr_symlink)
		nfserr = nfserr_inval;
	if (nfserr)
		return nfserr;
2244 2245
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
L
Linus Torvalds 已提交
2246 2247 2248 2249

	WRITE32(eof);
	WRITE32(maxcount);
	ADJUST_ARGS();
2250 2251
	resp->xbuf->head[0].iov_len = (char*)p
					- (char*)resp->xbuf->head[0].iov_base;
L
Linus Torvalds 已提交
2252 2253
	resp->xbuf->page_len = maxcount;

2254 2255
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
L
Linus Torvalds 已提交
2256 2257
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
2258 2259
		RESERVE_SPACE(4);
		WRITE32(0);
L
Linus Torvalds 已提交
2260 2261
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2262
		ADJUST_ARGS();
L
Linus Torvalds 已提交
2263 2264 2265 2266
	}
	return 0;
}

2267 2268
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
L
Linus Torvalds 已提交
2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
{
	int maxcount;
	char *page;
	ENCODE_HEAD;

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

2279
	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
L
Linus Torvalds 已提交
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297

	maxcount = PAGE_SIZE;
	RESERVE_SPACE(4);

	/*
	 * XXX: By default, the ->readlink() VFS op will truncate symlinks
	 * if they would overflow the buffer.  Is this kosher in NFSv4?  If
	 * not, one easy fix is: if ->readlink() precisely fills the buffer,
	 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
	 */
	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
	if (nfserr == nfserr_isdir)
		return nfserr_inval;
	if (nfserr)
		return nfserr;

	WRITE32(maxcount);
	ADJUST_ARGS();
2298 2299 2300
	resp->xbuf->head[0].iov_len = (char*)p
				- (char*)resp->xbuf->head[0].iov_base;
	resp->xbuf->page_len = maxcount;
L
Linus Torvalds 已提交
2301

2302 2303
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
L
Linus Torvalds 已提交
2304 2305
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
2306 2307
		RESERVE_SPACE(4);
		WRITE32(0);
L
Linus Torvalds 已提交
2308 2309
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2310
		ADJUST_ARGS();
L
Linus Torvalds 已提交
2311 2312 2313 2314
	}
	return 0;
}

2315 2316
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
L
Linus Torvalds 已提交
2317 2318 2319
{
	int maxcount;
	loff_t offset;
A
Al Viro 已提交
2320
	__be32 *page, *savep, *tailbase;
L
Linus Torvalds 已提交
2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335
	ENCODE_HEAD;

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

	RESERVE_SPACE(8);  /* verifier */
	savep = p;

	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
	ADJUST_ARGS();
	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2336
	tailbase = p;
L
Linus Torvalds 已提交
2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352

	maxcount = PAGE_SIZE;
	if (maxcount > readdir->rd_maxcount)
		maxcount = readdir->rd_maxcount;

	/*
	 * Convert from bytes to words, account for the two words already
	 * written, make sure to leave two words at the end for the next
	 * pointer and eof field.
	 */
	maxcount = (maxcount >> 2) - 4;
	if (maxcount < 0) {
		nfserr =  nfserr_toosmall;
		goto err_no_verf;
	}

2353
	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
L
Linus Torvalds 已提交
2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377
	readdir->common.err = 0;
	readdir->buflen = maxcount;
	readdir->buffer = page;
	readdir->offset = NULL;

	offset = readdir->rd_cookie;
	nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
			      &offset,
			      &readdir->common, nfsd4_encode_dirent);
	if (nfserr == nfs_ok &&
	    readdir->common.err == nfserr_toosmall &&
	    readdir->buffer == page) 
		nfserr = nfserr_toosmall;
	if (nfserr == nfserr_symlink)
		nfserr = nfserr_notdir;
	if (nfserr)
		goto err_no_verf;

	if (readdir->offset)
		xdr_encode_hyper(readdir->offset, offset);

	p = readdir->buffer;
	*p++ = 0;	/* no more entries */
	*p++ = htonl(readdir->common.err == nfserr_eof);
2378 2379
	resp->xbuf->page_len = ((char*)p) - (char*)page_address(
		resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
L
Linus Torvalds 已提交
2380

2381 2382
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = tailbase;
L
Linus Torvalds 已提交
2383 2384
	resp->xbuf->tail[0].iov_len = 0;
	resp->p = resp->xbuf->tail[0].iov_base;
2385
	resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
L
Linus Torvalds 已提交
2386 2387 2388 2389 2390 2391 2392 2393 2394

	return 0;
err_no_verf:
	p = savep;
	ADJUST_ARGS();
	return nfserr;
}

static void
2395
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
L
Linus Torvalds 已提交
2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(20);
		WRITECINFO(remove->rm_cinfo);
		ADJUST_ARGS();
	}
}

static void
2407
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
L
Linus Torvalds 已提交
2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(40);
		WRITECINFO(rename->rn_sinfo);
		WRITECINFO(rename->rn_tinfo);
		ADJUST_ARGS();
	}
}

A
Andy Adamson 已提交
2419
static void
2420
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
2421 2422 2423 2424
		     struct nfsd4_secinfo *secinfo)
{
	int i = 0;
	struct svc_export *exp = secinfo->si_exp;
2425 2426 2427
	u32 nflavs;
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
A
Andy Adamson 已提交
2428 2429 2430 2431
	ENCODE_HEAD;

	if (nfserr)
		goto out;
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
	if (exp->ex_nflavors) {
		flavs = exp->ex_flavors;
		nflavs = exp->ex_nflavors;
	} else { /* Handling of some defaults in absence of real secinfo: */
		flavs = def_flavs;
		if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
			nflavs = 2;
			flavs[0].pseudoflavor = RPC_AUTH_UNIX;
			flavs[1].pseudoflavor = RPC_AUTH_NULL;
		} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
			nflavs = 1;
			flavs[0].pseudoflavor
					= svcauth_gss_flavor(exp->ex_client);
		} else {
			nflavs = 1;
			flavs[0].pseudoflavor
					= exp->ex_client->flavour->flavour;
		}
	}

A
Andy Adamson 已提交
2452
	RESERVE_SPACE(4);
2453
	WRITE32(nflavs);
A
Andy Adamson 已提交
2454
	ADJUST_ARGS();
2455 2456
	for (i = 0; i < nflavs; i++) {
		u32 flav = flavs[i].pseudoflavor;
A
Andy Adamson 已提交
2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484
		struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);

		if (gm) {
			RESERVE_SPACE(4);
			WRITE32(RPC_AUTH_GSS);
			ADJUST_ARGS();
			RESERVE_SPACE(4 + gm->gm_oid.len);
			WRITE32(gm->gm_oid.len);
			WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(0); /* qop */
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(gss_pseudoflavor_to_service(gm, flav));
			ADJUST_ARGS();
			gss_mech_put(gm);
		} else {
			RESERVE_SPACE(4);
			WRITE32(flav);
			ADJUST_ARGS();
		}
	}
out:
	if (exp)
		exp_put(exp);
}

L
Linus Torvalds 已提交
2485 2486 2487 2488 2489
/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
static void
2490
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
L
Linus Torvalds 已提交
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508
{
	ENCODE_HEAD;

	RESERVE_SPACE(12);
	if (nfserr) {
		WRITE32(2);
		WRITE32(0);
		WRITE32(0);
	}
	else {
		WRITE32(2);
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
	}
	ADJUST_ARGS();
}

static void
2509
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
L
Linus Torvalds 已提交
2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8 + sizeof(nfs4_verifier));
		WRITEMEM(&scd->se_clientid, 8);
		WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
		ADJUST_ARGS();
	}
	else if (nfserr == nfserr_clid_inuse) {
		RESERVE_SPACE(8);
		WRITE32(0);
		WRITE32(0);
		ADJUST_ARGS();
	}
}

static void
2528
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
L
Linus Torvalds 已提交
2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(16);
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
		WRITEMEM(write->wr_verifier.data, 8);
		ADJUST_ARGS();
	}
}

void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
A
Al Viro 已提交
2544
	__be32 *statp;
L
Linus Torvalds 已提交
2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
	ENCODE_HEAD;

	RESERVE_SPACE(8);
	WRITE32(op->opnum);
	statp = p++;	/* to be backfilled at the end */
	ADJUST_ARGS();

	switch (op->opnum) {
	case OP_ACCESS:
		nfsd4_encode_access(resp, op->status, &op->u.access);
		break;
	case OP_CLOSE:
		nfsd4_encode_close(resp, op->status, &op->u.close);
		break;
	case OP_COMMIT:
		nfsd4_encode_commit(resp, op->status, &op->u.commit);
		break;
	case OP_CREATE:
		nfsd4_encode_create(resp, op->status, &op->u.create);
		break;
	case OP_DELEGRETURN:
		break;
	case OP_GETATTR:
		op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
		break;
	case OP_GETFH:
		nfsd4_encode_getfh(resp, op->status, op->u.getfh);
		break;
	case OP_LINK:
		nfsd4_encode_link(resp, op->status, &op->u.link);
		break;
	case OP_LOCK:
		nfsd4_encode_lock(resp, op->status, &op->u.lock);
		break;
	case OP_LOCKT:
		nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
		break;
	case OP_LOCKU:
		nfsd4_encode_locku(resp, op->status, &op->u.locku);
		break;
	case OP_LOOKUP:
		break;
	case OP_LOOKUPP:
		break;
	case OP_NVERIFY:
		break;
	case OP_OPEN:
		nfsd4_encode_open(resp, op->status, &op->u.open);
		break;
	case OP_OPEN_CONFIRM:
		nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
		break;
	case OP_OPEN_DOWNGRADE:
		nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
		break;
	case OP_PUTFH:
		break;
	case OP_PUTROOTFH:
		break;
	case OP_READ:
		op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
		break;
	case OP_READDIR:
		op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
		break;
	case OP_READLINK:
		op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
		break;
	case OP_REMOVE:
		nfsd4_encode_remove(resp, op->status, &op->u.remove);
		break;
	case OP_RENAME:
		nfsd4_encode_rename(resp, op->status, &op->u.rename);
		break;
	case OP_RENEW:
		break;
	case OP_RESTOREFH:
		break;
	case OP_SAVEFH:
		break;
A
Andy Adamson 已提交
2625 2626 2627
	case OP_SECINFO:
		nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
		break;
L
Linus Torvalds 已提交
2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684
	case OP_SETATTR:
		nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
		break;
	case OP_SETCLIENTID:
		nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
		break;
	case OP_SETCLIENTID_CONFIRM:
		break;
	case OP_VERIFY:
		break;
	case OP_WRITE:
		nfsd4_encode_write(resp, op->status, &op->u.write);
		break;
	case OP_RELEASE_LOCKOWNER:
		break;
	default:
		break;
	}

	/*
	 * Note: We write the status directly, instead of using WRITE32(),
	 * since it is already in network byte order.
	 */
	*statp = op->status;
}

/* 
 * Encode the reply stored in the stateowner reply cache 
 * 
 * XDR note: do not encode rp->rp_buflen: the buffer contains the
 * previously sent already encoded operation.
 *
 * called with nfs4_lock_state() held
 */
void
nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
	ENCODE_HEAD;
	struct nfs4_replay *rp = op->replay;

	BUG_ON(!rp);

	RESERVE_SPACE(8);
	WRITE32(op->opnum);
	*p++ = rp->rp_status;  /* already xdr'ed */
	ADJUST_ARGS();

	RESERVE_SPACE(rp->rp_buflen);
	WRITEMEM(rp->rp_buf, rp->rp_buflen);
	ADJUST_ARGS();
}

/*
 * END OF "GENERIC" ENCODE ROUTINES.
 */

int
A
Al Viro 已提交
2685
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
2686 2687 2688 2689 2690 2691 2692 2693 2694 2695
{
        return xdr_ressize_check(rqstp, p);
}

void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
{
	if (args->ops != args->iops) {
		kfree(args->ops);
		args->ops = args->iops;
	}
J
Jesper Juhl 已提交
2696 2697
	kfree(args->tmpp);
	args->tmpp = NULL;
L
Linus Torvalds 已提交
2698 2699 2700 2701 2702 2703 2704 2705 2706
	while (args->to_free) {
		struct tmpbuf *tb = args->to_free;
		args->to_free = tb->next;
		tb->release(tb->buf);
		kfree(tb);
	}
}

int
A
Al Viro 已提交
2707
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
L
Linus Torvalds 已提交
2708
{
2709
	__be32 status;
L
Linus Torvalds 已提交
2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727

	args->p = p;
	args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
	args->pagelist = rqstp->rq_arg.pages;
	args->pagelen = rqstp->rq_arg.page_len;
	args->tmpp = NULL;
	args->to_free = NULL;
	args->ops = args->iops;
	args->rqstp = rqstp;

	status = nfsd4_decode_compound(args);
	if (status) {
		nfsd4_release_compoundargs(args);
	}
	return !status;
}

int
A
Al Viro 已提交
2728
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
L
Linus Torvalds 已提交
2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753
{
	/*
	 * All that remains is to write the tag and operation count...
	 */
	struct kvec *iov;
	p = resp->tagp;
	*p++ = htonl(resp->taglen);
	memcpy(p, resp->tag, resp->taglen);
	p += XDR_QUADLEN(resp->taglen);
	*p++ = htonl(resp->opcnt);

	if (rqstp->rq_res.page_len) 
		iov = &rqstp->rq_res.tail[0];
	else
		iov = &rqstp->rq_res.head[0];
	iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
	BUG_ON(iov->iov_len > PAGE_SIZE);
	return 1;
}

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */