nfs3xdr.c 55.0 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
/*
 * linux/fs/nfs/nfs3xdr.c
 *
 * XDR functions to encode/decode NFSv3 RPC arguments and results.
 *
 * Copyright (C) 1996, 1997 Olaf Kirch
 */

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
22
#include <linux/nfsacl.h>
D
David Howells 已提交
23
#include "internal.h"
L
Linus Torvalds 已提交
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

#define NFSDBG_FACILITY		NFSDBG_XDR

/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO		EIO

/*
 * Declare the space requirements for NFS arguments and replies as
 * number of 32bit-words
 */
#define NFS3_fhandle_sz		(1+16)
#define NFS3_fh_sz		(NFS3_fhandle_sz)	/* shorthand */
#define NFS3_sattr_sz		(15)
#define NFS3_filename_sz	(1+(NFS3_MAXNAMLEN>>2))
#define NFS3_path_sz		(1+(NFS3_MAXPATHLEN>>2))
#define NFS3_fattr_sz		(21)
40
#define NFS3_cookieverf_sz	(NFS3_COOKIEVERFSIZE>>2)
41
#define NFS3_wcc_attr_sz	(6)
L
Linus Torvalds 已提交
42 43
#define NFS3_pre_op_attr_sz	(1+NFS3_wcc_attr_sz)
#define NFS3_post_op_attr_sz	(1+NFS3_fattr_sz)
44
#define NFS3_wcc_data_sz	(NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
L
Linus Torvalds 已提交
45
#define NFS3_diropargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
46 47 48 49

#define NFS3_getattrargs_sz	(NFS3_fh_sz)
#define NFS3_setattrargs_sz	(NFS3_fh_sz+NFS3_sattr_sz+3)
#define NFS3_lookupargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
L
Linus Torvalds 已提交
50 51 52 53 54 55
#define NFS3_accessargs_sz	(NFS3_fh_sz+1)
#define NFS3_readlinkargs_sz	(NFS3_fh_sz)
#define NFS3_readargs_sz	(NFS3_fh_sz+3)
#define NFS3_writeargs_sz	(NFS3_fh_sz+5)
#define NFS3_createargs_sz	(NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_mkdirargs_sz	(NFS3_diropargs_sz+NFS3_sattr_sz)
56
#define NFS3_symlinkargs_sz	(NFS3_diropargs_sz+1+NFS3_sattr_sz)
L
Linus Torvalds 已提交
57
#define NFS3_mknodargs_sz	(NFS3_diropargs_sz+2+NFS3_sattr_sz)
58
#define NFS3_removeargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
L
Linus Torvalds 已提交
59 60
#define NFS3_renameargs_sz	(NFS3_diropargs_sz+NFS3_diropargs_sz)
#define NFS3_linkargs_sz		(NFS3_fh_sz+NFS3_diropargs_sz)
61 62
#define NFS3_readdirargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+3)
#define NFS3_readdirplusargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+4)
L
Linus Torvalds 已提交
63 64
#define NFS3_commitargs_sz	(NFS3_fh_sz+3)

65 66 67
#define NFS3_getattrres_sz	(1+NFS3_fattr_sz)
#define NFS3_setattrres_sz	(1+NFS3_wcc_data_sz)
#define NFS3_removeres_sz	(NFS3_setattrres_sz)
L
Linus Torvalds 已提交
68 69 70 71 72 73 74 75 76 77 78 79 80 81
#define NFS3_lookupres_sz	(1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
#define NFS3_accessres_sz	(1+NFS3_post_op_attr_sz+1)
#define NFS3_readlinkres_sz	(1+NFS3_post_op_attr_sz+1)
#define NFS3_readres_sz		(1+NFS3_post_op_attr_sz+3)
#define NFS3_writeres_sz	(1+NFS3_wcc_data_sz+4)
#define NFS3_createres_sz	(1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_renameres_sz	(1+(2 * NFS3_wcc_data_sz))
#define NFS3_linkres_sz		(1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_readdirres_sz	(1+NFS3_post_op_attr_sz+2)
#define NFS3_fsstatres_sz	(1+NFS3_post_op_attr_sz+13)
#define NFS3_fsinfores_sz	(1+NFS3_post_op_attr_sz+12)
#define NFS3_pathconfres_sz	(1+NFS3_post_op_attr_sz+6)
#define NFS3_commitres_sz	(1+NFS3_wcc_data_sz+2)

82
#define ACL3_getaclargs_sz	(NFS3_fh_sz+1)
T
Trond Myklebust 已提交
83 84 85 86
#define ACL3_setaclargs_sz	(NFS3_fh_sz+1+ \
				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_getaclres_sz	(1+NFS3_post_op_attr_sz+1+ \
				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
87 88
#define ACL3_setaclres_sz	(1+NFS3_post_op_attr_sz)

L
Linus Torvalds 已提交
89 90 91
/*
 * Map file type to S_IFMT bits
 */
92 93 94 95 96 97 98 99 100
static const umode_t nfs_type2fmt[] = {
	[NF3BAD] = 0,
	[NF3REG] = S_IFREG,
	[NF3DIR] = S_IFDIR,
	[NF3BLK] = S_IFBLK,
	[NF3CHR] = S_IFCHR,
	[NF3LNK] = S_IFLNK,
	[NF3SOCK] = S_IFSOCK,
	[NF3FIFO] = S_IFIFO,
L
Linus Torvalds 已提交
101 102
};

103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
/*
 * While encoding arguments, set up the reply buffer in advance to
 * receive reply data directly into the page cache.
 */
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
				 unsigned int base, unsigned int len,
				 unsigned int bufsize)
{
	struct rpc_auth	*auth = req->rq_cred->cr_auth;
	unsigned int replen;

	replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}

118 119 120 121 122 123 124 125 126 127
/*
 * Handle decode buffer overflows out-of-line.
 */
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
		"Remaining buffer length is %tu words.\n",
		func, xdr->end - xdr->p);
}

128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145

/*
 * Encode/decode NFSv3 basic data types
 *
 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 *
 * Not all basic data types have their own encoding and decoding
 * functions.  For run-time efficiency, some data types are encoded
 * or decoded inline.
 */

static void encode_uint32(struct xdr_stream *xdr, u32 value)
{
	__be32 *p = xdr_reserve_space(xdr, 4);
	*p = cpu_to_be32(value);
}

146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
static int decode_uint32(struct xdr_stream *xdr, u32 *value)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	*value = be32_to_cpup(p);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int decode_uint64(struct xdr_stream *xdr, u64 *value)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 8);
	if (unlikely(p == NULL))
		goto out_overflow;
	xdr_decode_hyper(p, value);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * fileid3
 *
 *	typedef uint64 fileid3;
 */
179 180 181 182 183
static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
{
	return xdr_decode_hyper(p, fileid);
}

184 185 186 187 188
static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
{
	return decode_uint64(xdr, fileid);
}

189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
/*
 * filename3
 *
 *	typedef string filename3<>;
 */
static void encode_filename3(struct xdr_stream *xdr,
			     const char *name, u32 length)
{
	__be32 *p;

	BUG_ON(length > NFS3_MAXNAMLEN);
	p = xdr_reserve_space(xdr, 4 + length);
	xdr_encode_opaque(p, name, length);
}

204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
static int decode_inline_filename3(struct xdr_stream *xdr,
				   const char **name, u32 *length)
{
	__be32 *p;
	u32 count;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	count = be32_to_cpup(p);
	if (count > NFS3_MAXNAMLEN)
		goto out_nametoolong;
	p = xdr_inline_decode(xdr, count);
	if (unlikely(p == NULL))
		goto out_overflow;
	*name = (const char *)p;
	*length = count;
	return 0;

out_nametoolong:
	dprintk("NFS: returned filename too long: %u\n", count);
	return -ENAMETOOLONG;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

231 232 233 234 235 236 237 238 239 240 241 242 243
/*
 * nfspath3
 *
 *	typedef string nfspath3<>;
 */
static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
			    const u32 length)
{
	BUG_ON(length > NFS3_MAXPATHLEN);
	encode_uint32(xdr, length);
	xdr_write_pages(xdr, pages, 0, length);
}

244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
static int decode_nfspath3(struct xdr_stream *xdr)
{
	u32 recvd, count;
	size_t hdrlen;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	count = be32_to_cpup(p);
	if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
		goto out_nametoolong;
	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
	recvd = xdr->buf->len - hdrlen;
	if (unlikely(count > recvd))
		goto out_cheating;

	xdr_read_pages(xdr, count);
	xdr_terminate_string(xdr->buf, count);
	return 0;

out_nametoolong:
	dprintk("NFS: returned pathname too long: %u\n", count);
	return -ENAMETOOLONG;
out_cheating:
	dprintk("NFS: server cheating in pathname result: "
		"count %u > recvd %u\n", count, recvd);
	return -EIO;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

277 278 279 280 281 282 283 284 285 286
/*
 * cookie3
 *
 *	typedef uint64 cookie3
 */
static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
{
	return xdr_encode_hyper(p, cookie);
}

287 288 289 290 291
static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
{
	return decode_uint64(xdr, cookie);
}

292 293 294 295 296 297 298 299 300 301 302
/*
 * cookieverf3
 *
 *	typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
 */
static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
{
	memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
	return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
}

303 304 305 306 307 308 309 310 311 312 313 314 315 316
static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
	if (unlikely(p == NULL))
		goto out_overflow;
	memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

317 318 319 320 321 322 323 324 325 326 327 328 329
/*
 * createverf3
 *
 *	typedef opaque createverf3[NFS3_CREATEVERFSIZE];
 */
static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
	memcpy(p, verifier, NFS3_CREATEVERFSIZE);
}

330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377
static int decode_writeverf3(struct xdr_stream *xdr, __be32 *verifier)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
	if (unlikely(p == NULL))
		goto out_overflow;
	memcpy(verifier, p, NFS3_WRITEVERFSIZE);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * size3
 *
 *	typedef uint64 size3;
 */
static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
{
	return xdr_decode_hyper(p, size);
}

/*
 * nfsstat3
 *
 *	enum nfsstat3 {
 *		NFS3_OK = 0,
 *		...
 *	}
 */
#define NFS3_OK		NFS_OK

static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	*status = be32_to_cpup(p);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396
/*
 * ftype3
 *
 *	enum ftype3 {
 *		NF3REG	= 1,
 *		NF3DIR	= 2,
 *		NF3BLK	= 3,
 *		NF3CHR	= 4,
 *		NF3LNK	= 5,
 *		NF3SOCK	= 6,
 *		NF3FIFO	= 7
 *	};
 */
static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
{
	BUG_ON(type > NF3FIFO);
	encode_uint32(xdr, type);
}

397 398 399 400 401 402 403 404 405 406 407
static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
{
	u32 type;

	type = be32_to_cpup(p++);
	if (type > NF3FIFO)
		type = NF3NON;
	*mode = nfs_type2fmt[type];
	return p;
}

408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
/*
 * specdata3
 *
 *     struct specdata3 {
 *             uint32  specdata1;
 *             uint32  specdata2;
 *     };
 */
static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, 8);
	*p++ = cpu_to_be32(MAJOR(rdev));
	*p = cpu_to_be32(MINOR(rdev));
}

425 426 427 428 429 430 431 432 433 434 435 436
static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
{
	unsigned int major, minor;

	major = be32_to_cpup(p++);
	minor = be32_to_cpup(p++);
	*rdev = MKDEV(major, minor);
	if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
		*rdev = 0;
	return p;
}

437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
/*
 * nfs_fh3
 *
 *	struct nfs_fh3 {
 *		opaque       data<NFS3_FHSIZE>;
 *	};
 */
static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
{
	__be32 *p;

	BUG_ON(fh->size > NFS3_FHSIZE);
	p = xdr_reserve_space(xdr, 4 + fh->size);
	xdr_encode_opaque(p, fh->data, fh->size);
}

453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482
static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
	u32 length;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	length = be32_to_cpup(p++);
	if (unlikely(length > NFS3_FHSIZE))
		goto out_toobig;
	p = xdr_inline_decode(xdr, length);
	if (unlikely(p == NULL))
		goto out_overflow;
	fh->size = length;
	memcpy(fh->data, p, length);
	return 0;
out_toobig:
	dprintk("NFS: file handle size (%u) too big\n", length);
	return -E2BIG;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static void zero_nfs_fh3(struct nfs_fh *fh)
{
	memset(fh, 0, sizeof(*fh));
}

483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
/*
 * nfstime3
 *
 *	struct nfstime3 {
 *		uint32	seconds;
 *		uint32	nseconds;
 *	};
 */
static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
{
	*p++ = cpu_to_be32(timep->tv_sec);
	*p++ = cpu_to_be32(timep->tv_nsec);
	return p;
}

498 499 500 501 502 503 504
static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
{
	timep->tv_sec = be32_to_cpup(p++);
	timep->tv_nsec = be32_to_cpup(p++);
	return p;
}

505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590
/*
 * sattr3
 *
 *	enum time_how {
 *		DONT_CHANGE		= 0,
 *		SET_TO_SERVER_TIME	= 1,
 *		SET_TO_CLIENT_TIME	= 2
 *	};
 *
 *	union set_mode3 switch (bool set_it) {
 *	case TRUE:
 *		mode3	mode;
 *	default:
 *		void;
 *	};
 *
 *	union set_uid3 switch (bool set_it) {
 *	case TRUE:
 *		uid3	uid;
 *	default:
 *		void;
 *	};
 *
 *	union set_gid3 switch (bool set_it) {
 *	case TRUE:
 *		gid3	gid;
 *	default:
 *		void;
 *	};
 *
 *	union set_size3 switch (bool set_it) {
 *	case TRUE:
 *		size3	size;
 *	default:
 *		void;
 *	};
 *
 *	union set_atime switch (time_how set_it) {
 *	case SET_TO_CLIENT_TIME:
 *		nfstime3	atime;
 *	default:
 *		void;
 *	};
 *
 *	union set_mtime switch (time_how set_it) {
 *	case SET_TO_CLIENT_TIME:
 *		nfstime3  mtime;
 *	default:
 *		void;
 *	};
 *
 *	struct sattr3 {
 *		set_mode3	mode;
 *		set_uid3	uid;
 *		set_gid3	gid;
 *		set_size3	size;
 *		set_atime	atime;
 *		set_mtime	mtime;
 *	};
 */
static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
{
	u32 nbytes;
	__be32 *p;

	/*
	 * In order to make only a single xdr_reserve_space() call,
	 * pre-compute the total number of bytes to be reserved.
	 * Six boolean values, one for each set_foo field, are always
	 * present in the encoded result, so start there.
	 */
	nbytes = 6 * 4;
	if (attr->ia_valid & ATTR_MODE)
		nbytes += 4;
	if (attr->ia_valid & ATTR_UID)
		nbytes += 4;
	if (attr->ia_valid & ATTR_GID)
		nbytes += 4;
	if (attr->ia_valid & ATTR_SIZE)
		nbytes += 8;
	if (attr->ia_valid & ATTR_ATIME_SET)
		nbytes += 8;
	if (attr->ia_valid & ATTR_MTIME_SET)
		nbytes += 8;
	p = xdr_reserve_space(xdr, nbytes);

591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
	if (attr->ia_valid & ATTR_MODE) {
		*p++ = xdr_one;
		*p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_UID) {
		*p++ = xdr_one;
		*p++ = cpu_to_be32(attr->ia_uid);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_GID) {
		*p++ = xdr_one;
		*p++ = cpu_to_be32(attr->ia_gid);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_SIZE) {
		*p++ = xdr_one;
		p = xdr_encode_hyper(p, (u64)attr->ia_size);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_ATIME_SET) {
		*p++ = xdr_two;
		p = xdr_encode_nfstime3(p, &attr->ia_atime);
	} else if (attr->ia_valid & ATTR_ATIME) {
		*p++ = xdr_one;
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_MTIME_SET) {
		*p++ = xdr_two;
		xdr_encode_nfstime3(p, &attr->ia_mtime);
	} else if (attr->ia_valid & ATTR_MTIME) {
		*p = xdr_one;
	} else
		*p = xdr_zero;
630 631
}

632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652
/*
 * fattr3
 *
 *	struct fattr3 {
 *		ftype3		type;
 *		mode3		mode;
 *		uint32		nlink;
 *		uid3		uid;
 *		gid3		gid;
 *		size3		size;
 *		size3		used;
 *		specdata3	rdev;
 *		uint64		fsid;
 *		fileid3		fileid;
 *		nfstime3	atime;
 *		nfstime3	mtime;
 *		nfstime3	ctime;
 *	};
 */
static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
653
	umode_t fmode;
654 655 656 657 658
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
	if (unlikely(p == NULL))
		goto out_overflow;
659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679

	p = xdr_decode_ftype3(p, &fmode);

	fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
	fattr->nlink = be32_to_cpup(p++);
	fattr->uid = be32_to_cpup(p++);
	fattr->gid = be32_to_cpup(p++);

	p = xdr_decode_size3(p, &fattr->size);
	p = xdr_decode_size3(p, &fattr->du.nfs3.used);
	p = xdr_decode_specdata3(p, &fattr->rdev);

	p = xdr_decode_hyper(p, &fattr->fsid.major);
	fattr->fsid.minor = 0;

	p = xdr_decode_fileid3(p, &fattr->fileid);
	p = xdr_decode_nfstime3(p, &fattr->atime);
	p = xdr_decode_nfstime3(p, &fattr->mtime);
	xdr_decode_nfstime3(p, &fattr->ctime);

	fattr->valid |= NFS_ATTR_FATTR_V3;
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * post_op_attr
 *
 *	union post_op_attr switch (bool attributes_follow) {
 *	case TRUE:
 *		fattr3	attributes;
 *	case FALSE:
 *		void;
 *	};
 */
static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p != xdr_zero)
		return decode_fattr3(xdr, fattr);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * wcc_attr
 *	struct wcc_attr {
 *		size3		size;
 *		nfstime3	mtime;
 *		nfstime3	ctime;
 *	};
 */
static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
	if (unlikely(p == NULL))
		goto out_overflow;
726 727 728 729 730 731 732 733 734

	fattr->valid |= NFS_ATTR_FATTR_PRESIZE
		| NFS_ATTR_FATTR_PREMTIME
		| NFS_ATTR_FATTR_PRECTIME;

	p = xdr_decode_size3(p, &fattr->pre_size);
	p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
	xdr_decode_nfstime3(p, &fattr->pre_ctime);

735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * pre_op_attr
 *	union pre_op_attr switch (bool attributes_follow) {
 *	case TRUE:
 *		wcc_attr	attributes;
 *	case FALSE:
 *		void;
 *	};
 *
 * wcc_data
 *
 *	struct wcc_data {
 *		pre_op_attr	before;
 *		post_op_attr	after;
 *	};
 */
static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p != xdr_zero)
		return decode_wcc_attr(xdr, fattr);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	int error;

	error = decode_pre_op_attr(xdr, fattr);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(xdr, fattr);
out:
	return error;
}

/*
 * post_op_fh3
 *
 *	union post_op_fh3 switch (bool handle_follows) {
 *	case TRUE:
 *		nfs_fh3  handle;
 *	case FALSE:
 *		void;
 *	};
 */
static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
	__be32 *p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p != xdr_zero)
		return decode_nfs_fh3(xdr, fh);
	zero_nfs_fh3(fh);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
/*
 * diropargs3
 *
 *	struct diropargs3 {
 *		nfs_fh3		dir;
 *		filename3	name;
 *	};
 */
static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
			      const char *name, u32 length)
{
	encode_nfs_fh3(xdr, fh);
	encode_filename3(xdr, name, length);
}


L
Linus Torvalds 已提交
824
/*
825 826 827 828
 * NFSv3 XDR encode functions
 *
 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
L
Linus Torvalds 已提交
829 830
 */

831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
/*
 * 3.3.1  GETATTR3args
 *
 *	struct GETATTR3args {
 *		nfs_fh3  object;
 *	};
 */
static int nfs3_xdr_enc_getattr3args(struct rpc_rqst *req, __be32 *p,
				     const struct nfs_fh *fh)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_nfs_fh3(&xdr, fh);
	return 0;
}

/*
 * 3.3.2  SETATTR3args
 *
 *	union sattrguard3 switch (bool check) {
 *	case TRUE:
 *		nfstime3  obj_ctime;
 *	case FALSE:
 *		void;
 *	};
 *
 *	struct SETATTR3args {
 *		nfs_fh3		object;
 *		sattr3		new_attributes;
 *		sattrguard3	guard;
 *	};
 */
static void encode_sattrguard3(struct xdr_stream *xdr,
			       const struct nfs3_sattrargs *args)
{
	__be32 *p;

	if (args->guard) {
		p = xdr_reserve_space(xdr, 4 + 8);
		*p++ = xdr_one;
872
		xdr_encode_nfstime3(p, &args->guardtime);
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 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 1116 1117 1118 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 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 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 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
	} else {
		p = xdr_reserve_space(xdr, 4);
		*p = xdr_zero;
	}
}

static int nfs3_xdr_enc_setattr3args(struct rpc_rqst *req, __be32 *p,
				     const struct nfs3_sattrargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_nfs_fh3(&xdr, args->fh);
	encode_sattr3(&xdr, args->sattr);
	encode_sattrguard3(&xdr, args);
	return 0;
}

/*
 * 3.3.3  LOOKUP3args
 *
 *	struct LOOKUP3args {
 *		diropargs3  what;
 *	};
 */
static int nfs3_xdr_enc_lookup3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs3_diropargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->fh, args->name, args->len);
	return 0;
}

/*
 * 3.3.4  ACCESS3args
 *
 *	struct ACCESS3args {
 *		nfs_fh3		object;
 *		uint32		access;
 *	};
 */
static void encode_access3args(struct xdr_stream *xdr,
			       const struct nfs3_accessargs *args)
{
	encode_nfs_fh3(xdr, args->fh);
	encode_uint32(xdr, args->access);
}

static int nfs3_xdr_enc_access3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs3_accessargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_access3args(&xdr, args);
	return 0;
}

/*
 * 3.3.5  READLINK3args
 *
 *	struct READLINK3args {
 *		nfs_fh3	symlink;
 *	};
 */
static int nfs3_xdr_enc_readlink3args(struct rpc_rqst *req, __be32 *p,
				      const struct nfs3_readlinkargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_nfs_fh3(&xdr, args->fh);
	prepare_reply_buffer(req, args->pages, args->pgbase,
					args->pglen, NFS3_readlinkres_sz);
	return 0;
}

/*
 * 3.3.6  READ3args
 *
 *	struct READ3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *	};
 */
static void encode_read3args(struct xdr_stream *xdr,
			     const struct nfs_readargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + 4);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
}

static int nfs3_xdr_enc_read3args(struct rpc_rqst *req, __be32 *p,
				  const struct nfs_readargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_read3args(&xdr, args);
	prepare_reply_buffer(req, args->pages, args->pgbase,
					args->count, NFS3_readres_sz);
	req->rq_rcv_buf.flags |= XDRBUF_READ;
	return 0;
}

/*
 * 3.3.7  WRITE3args
 *
 *	enum stable_how {
 *		UNSTABLE  = 0,
 *		DATA_SYNC = 1,
 *		FILE_SYNC = 2
 *	};
 *
 *	struct WRITE3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *		stable_how	stable;
 *		opaque		data<>;
 *	};
 */
static void encode_write3args(struct xdr_stream *xdr,
			      const struct nfs_writeargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
	p = xdr_encode_hyper(p, args->offset);
	*p++ = cpu_to_be32(args->count);
	*p++ = cpu_to_be32(args->stable);
	*p = cpu_to_be32(args->count);
	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
}

static int nfs3_xdr_enc_write3args(struct rpc_rqst *req, __be32 *p,
				   const struct nfs_writeargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_write3args(&xdr, args);
	xdr.buf->flags |= XDRBUF_WRITE;
	return 0;
}

/*
 * 3.3.8  CREATE3args
 *
 *	enum createmode3 {
 *		UNCHECKED = 0,
 *		GUARDED   = 1,
 *		EXCLUSIVE = 2
 *	};
 *
 *	union createhow3 switch (createmode3 mode) {
 *	case UNCHECKED:
 *	case GUARDED:
 *		sattr3       obj_attributes;
 *	case EXCLUSIVE:
 *		createverf3  verf;
 *	};
 *
 *	struct CREATE3args {
 *		diropargs3	where;
 *		createhow3	how;
 *	};
 */
static void encode_createhow3(struct xdr_stream *xdr,
			      const struct nfs3_createargs *args)
{
	encode_uint32(xdr, args->createmode);
	switch (args->createmode) {
	case NFS3_CREATE_UNCHECKED:
	case NFS3_CREATE_GUARDED:
		encode_sattr3(xdr, args->sattr);
		break;
	case NFS3_CREATE_EXCLUSIVE:
		encode_createverf3(xdr, args->verifier);
		break;
	default:
		BUG();
	}
}

static int nfs3_xdr_enc_create3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs3_createargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->fh, args->name, args->len);
	encode_createhow3(&xdr, args);
	return 0;
}

/*
 * 3.3.9  MKDIR3args
 *
 *	struct MKDIR3args {
 *		diropargs3	where;
 *		sattr3		attributes;
 *	};
 */
static int nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req, __be32 *p,
				   const struct nfs3_mkdirargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->fh, args->name, args->len);
	encode_sattr3(&xdr, args->sattr);
	return 0;
}

/*
 * 3.3.10  SYMLINK3args
 *
 *	struct symlinkdata3 {
 *		sattr3		symlink_attributes;
 *		nfspath3	symlink_data;
 *	};
 *
 *	struct SYMLINK3args {
 *		diropargs3	where;
 *		symlinkdata3	symlink;
 *	};
 */
static void encode_symlinkdata3(struct xdr_stream *xdr,
				const struct nfs3_symlinkargs *args)
{
	encode_sattr3(xdr, args->sattr);
	encode_nfspath3(xdr, args->pages, args->pathlen);
}

static int nfs3_xdr_enc_symlink3args(struct rpc_rqst *req, __be32 *p,
				     const struct nfs3_symlinkargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->fromfh, args->fromname, args->fromlen);
	encode_symlinkdata3(&xdr, args);
	return 0;
}

/*
 * 3.3.11  MKNOD3args
 *
 *	struct devicedata3 {
 *		sattr3		dev_attributes;
 *		specdata3	spec;
 *	};
 *
 *	union mknoddata3 switch (ftype3 type) {
 *	case NF3CHR:
 *	case NF3BLK:
 *		devicedata3	device;
 *	case NF3SOCK:
 *	case NF3FIFO:
 *		sattr3		pipe_attributes;
 *	default:
 *		void;
 *	};
 *
 *	struct MKNOD3args {
 *		diropargs3	where;
 *		mknoddata3	what;
 *	};
 */
static void encode_devicedata3(struct xdr_stream *xdr,
			       const struct nfs3_mknodargs *args)
{
	encode_sattr3(xdr, args->sattr);
	encode_specdata3(xdr, args->rdev);
}

static void encode_mknoddata3(struct xdr_stream *xdr,
			      const struct nfs3_mknodargs *args)
{
	encode_ftype3(xdr, args->type);
	switch (args->type) {
	case NF3CHR:
	case NF3BLK:
		encode_devicedata3(xdr, args);
		break;
	case NF3SOCK:
	case NF3FIFO:
		encode_sattr3(xdr, args->sattr);
		break;
	case NF3REG:
	case NF3DIR:
		break;
	default:
		BUG();
	}
}

static int nfs3_xdr_enc_mknod3args(struct rpc_rqst *req, __be32 *p,
				   const struct nfs3_mknodargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->fh, args->name, args->len);
	encode_mknoddata3(&xdr, args);
	return 0;
}

/*
 * 3.3.12  REMOVE3args
 *
 *	struct REMOVE3args {
 *		diropargs3  object;
 *	};
 */
static int nfs3_xdr_enc_remove3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs_removeargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->fh, args->name.name, args->name.len);
	return 0;
}

/*
 * 3.3.14  RENAME3args
 *
 *	struct RENAME3args {
 *		diropargs3	from;
 *		diropargs3	to;
 *	};
 */
static int nfs3_xdr_enc_rename3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs_renameargs *args)
{
	const struct qstr *old = args->old_name;
	const struct qstr *new = args->new_name;
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_diropargs3(&xdr, args->old_dir, old->name, old->len);
	encode_diropargs3(&xdr, args->new_dir, new->name, new->len);
	return 0;
}

/*
 * 3.3.15  LINK3args
 *
 *	struct LINK3args {
 *		nfs_fh3		file;
 *		diropargs3	link;
 *	};
 */
static int nfs3_xdr_enc_link3args(struct rpc_rqst *req, __be32 *p,
				  const struct nfs3_linkargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_nfs_fh3(&xdr, args->fromfh);
	encode_diropargs3(&xdr, args->tofh, args->toname, args->tolen);
	return 0;
}

/*
 * 3.3.16  READDIR3args
 *
 *	struct READDIR3args {
 *		nfs_fh3		dir;
 *		cookie3		cookie;
 *		cookieverf3	cookieverf;
 *		count3		count;
 *	};
 */
static void encode_readdir3args(struct xdr_stream *xdr,
				const struct nfs3_readdirargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
	p = xdr_encode_cookie3(p, args->cookie);
	p = xdr_encode_cookieverf3(p, args->verf);
	*p = cpu_to_be32(args->count);
}

static int nfs3_xdr_enc_readdir3args(struct rpc_rqst *req, __be32 *p,
				     const struct nfs3_readdirargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_readdir3args(&xdr, args);
	prepare_reply_buffer(req, args->pages, 0,
				args->count, NFS3_readdirres_sz);
	return 0;
}

/*
 * 3.3.17  READDIRPLUS3args
 *
 *	struct READDIRPLUS3args {
 *		nfs_fh3		dir;
 *		cookie3		cookie;
 *		cookieverf3	cookieverf;
 *		count3		dircount;
 *		count3		maxcount;
 *	};
 */
static void encode_readdirplus3args(struct xdr_stream *xdr,
				    const struct nfs3_readdirargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
	p = xdr_encode_cookie3(p, args->cookie);
	p = xdr_encode_cookieverf3(p, args->verf);

	/*
	 * readdirplus: need dircount + buffer size.
	 * We just make sure we make dircount big enough
	 */
	*p++ = cpu_to_be32(args->count >> 3);

	*p = cpu_to_be32(args->count);
}

static int nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req, __be32 *p,
					 const struct nfs3_readdirargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_readdirplus3args(&xdr, args);
	prepare_reply_buffer(req, args->pages, 0,
				args->count, NFS3_readdirres_sz);
	return 0;
}

/*
 * 3.3.21  COMMIT3args
 *
 *	struct COMMIT3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *	};
 */
static void encode_commit3args(struct xdr_stream *xdr,
			       const struct nfs_writeargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + 4);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
}

static int nfs3_xdr_enc_commit3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs_writeargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_commit3args(&xdr, args);
	return 0;
}

1358 1359
#ifdef CONFIG_NFS_V3_ACL

1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
static int nfs3_xdr_enc_getacl3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs3_getaclargs *args)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_nfs_fh3(&xdr, args->fh);
	encode_uint32(&xdr, args->mask);
	if (args->mask & (NFS_ACL | NFS_DFACL))
		prepare_reply_buffer(req, args->pages, 0,
					NFSACL_MAXPAGES << PAGE_SHIFT,
					ACL3_getaclres_sz);
	return 0;
}

static int nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, __be32 *p,
				    const struct nfs3_setaclargs *args)
{
	struct xdr_stream xdr;
	unsigned int base;
	int error;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_nfs_fh3(&xdr, NFS_FH(args->inode));
	encode_uint32(&xdr, args->mask);
	if (args->npages != 0)
		xdr_write_pages(&xdr, args->pages, 0, args->len);

	base = req->rq_slen;
	error = nfsacl_encode(xdr.buf, base, args->inode,
			    (args->mask & NFS_ACL) ?
			    args->acl_access : NULL, 1, 0);
	BUG_ON(error < 0);
	error = nfsacl_encode(xdr.buf, base + error, args->inode,
			    (args->mask & NFS_DFACL) ?
			    args->acl_default : NULL, 1,
			    NFS_ACL_DEFAULT);
	BUG_ON(error < 0);
	return 0;
}

1401 1402
#endif  /* CONFIG_NFS_V3_ACL */

L
Linus Torvalds 已提交
1403
/*
1404 1405 1406 1407
 * NFSv3 XDR decode functions
 *
 * NFSv3 result types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
L
Linus Torvalds 已提交
1408 1409 1410
 */

/*
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
 * 3.3.1  GETATTR3res
 *
 *	struct GETATTR3resok {
 *		fattr3		obj_attributes;
 *	};
 *
 *	union GETATTR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		GETATTR3resok  resok;
 *	default:
 *		void;
 *	};
L
Linus Torvalds 已提交
1423
 */
1424 1425
static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req, __be32 *p,
				    struct nfs_fattr *result)
L
Linus Torvalds 已提交
1426
{
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 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 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 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 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 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 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 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 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 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_fattr3(&xdr, result);
out:
	return error;
out_default:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.2  SETATTR3res
 *
 *	struct SETATTR3resok {
 *		wcc_data  obj_wcc;
 *	};
 *
 *	struct SETATTR3resfail {
 *		wcc_data  obj_wcc;
 *	};
 *
 *	union SETATTR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		SETATTR3resok   resok;
 *	default:
 *		SETATTR3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req, __be32 *p,
				    struct nfs_fattr *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.3  LOOKUP3res
 *
 *	struct LOOKUP3resok {
 *		nfs_fh3		object;
 *		post_op_attr	obj_attributes;
 *		post_op_attr	dir_attributes;
 *	};
 *
 *	struct LOOKUP3resfail {
 *		post_op_attr	dir_attributes;
 *	};
 *
 *	union LOOKUP3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		LOOKUP3resok	resok;
 *	default:
 *		LOOKUP3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs3_diropres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_nfs_fh3(&xdr, result->fh);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->dir_attr);
out:
	return error;
out_default:
	error = decode_post_op_attr(&xdr, result->dir_attr);
	if (unlikely(error))
		goto out;
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.4  ACCESS3res
 *
 *	struct ACCESS3resok {
 *		post_op_attr	obj_attributes;
 *		uint32		access;
 *	};
 *
 *	struct ACCESS3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union ACCESS3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		ACCESS3resok	resok;
 *	default:
 *		ACCESS3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_access3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs3_accessres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_uint32(&xdr, &result->access);
out:
	return error;
out_default:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.5  READLINK3res
 *
 *	struct READLINK3resok {
 *		post_op_attr	symlink_attributes;
 *		nfspath3	data;
 *	};
 *
 *	struct READLINK3resfail {
 *		post_op_attr	symlink_attributes;
 *	};
 *
 *	union READLINK3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		READLINK3resok	resok;
 *	default:
 *		READLINK3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req, __be32 *p,
				     struct nfs_fattr *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_nfspath3(&xdr);
out:
	return error;
out_default:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.6  READ3res
 *
 *	struct READ3resok {
 *		post_op_attr	file_attributes;
 *		count3		count;
 *		bool		eof;
 *		opaque		data<>;
 *	};
 *
 *	struct READ3resfail {
 *		post_op_attr	file_attributes;
 *	};
 *
 *	union READ3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		READ3resok	resok;
 *	default:
 *		READ3resfail	resfail;
 *	};
 */
static int decode_read3resok(struct xdr_stream *xdr,
			     struct nfs_readres *result)
{
	u32 eof, count, ocount, recvd;
	size_t hdrlen;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	count = be32_to_cpup(p++);
	eof = be32_to_cpup(p++);
	ocount = be32_to_cpup(p++);
	if (unlikely(ocount != count))
		goto out_mismatch;
	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
	recvd = xdr->buf->len - hdrlen;
	if (unlikely(count > recvd))
		goto out_cheating;

out:
	xdr_read_pages(xdr, count);
	result->eof = eof;
	result->count = count;
	return count;
out_mismatch:
	dprintk("NFS: READ count doesn't match length of opaque: "
		"count %u != ocount %u\n", count, ocount);
	return -EIO;
out_cheating:
	dprintk("NFS: server cheating in read result: "
		"count %u > recvd %u\n", count, recvd);
	count = recvd;
	eof = 0;
	goto out;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, __be32 *p,
				 struct nfs_readres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_read3resok(&xdr, result);
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.7  WRITE3res
 *
 *	enum stable_how {
 *		UNSTABLE  = 0,
 *		DATA_SYNC = 1,
 *		FILE_SYNC = 2
 *	};
 *
 *	struct WRITE3resok {
 *		wcc_data	file_wcc;
 *		count3		count;
 *		stable_how	committed;
 *		writeverf3	verf;
 *	};
 *
 *	struct WRITE3resfail {
 *		wcc_data	file_wcc;
 *	};
 *
 *	union WRITE3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		WRITE3resok	resok;
 *	default:
 *		WRITE3resfail	resfail;
 *	};
 */
static int decode_write3resok(struct xdr_stream *xdr,
			      struct nfs_writeres *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
	if (unlikely(p == NULL))
		goto out_overflow;
	result->count = be32_to_cpup(p++);
	result->verf->committed = be32_to_cpup(p++);
	if (unlikely(result->verf->committed > NFS_FILE_SYNC))
		goto out_badvalue;
	memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
	return result->count;
out_badvalue:
	dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
	return -EIO;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, __be32 *p,
				  struct nfs_writeres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_write3resok(&xdr, result);
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.8  CREATE3res
 *
 *	struct CREATE3resok {
 *		post_op_fh3	obj;
 *		post_op_attr	obj_attributes;
 *		wcc_data	dir_wcc;
 *	};
 *
 *	struct CREATE3resfail {
 *		wcc_data	dir_wcc;
 *	};
 *
 *	union CREATE3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		CREATE3resok	resok;
 *	default:
 *		CREATE3resfail	resfail;
 *	};
 */
static int decode_create3resok(struct xdr_stream *xdr,
			       struct nfs3_diropres *result)
{
	int error;

	error = decode_post_op_fh3(xdr, result->fh);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(xdr, result->fattr);
	if (unlikely(error))
		goto out;
	/* The server isn't required to return a file handle.
	 * If it didn't, force the client to perform a LOOKUP
	 * to determine the correct file handle and attribute
	 * values for the new object. */
	if (result->fh->size == 0)
		result->fattr->valid = 0;
	error = decode_wcc_data(xdr, result->dir_attr);
out:
	return error;
}

static int nfs3_xdr_dec_create3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs3_diropres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_create3resok(&xdr, result);
out:
	return error;
out_default:
	error = decode_wcc_data(&xdr, result->dir_attr);
	if (unlikely(error))
		goto out;
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.12  REMOVE3res
 *
 *	struct REMOVE3resok {
 *		wcc_data    dir_wcc;
 *	};
 *
 *	struct REMOVE3resfail {
 *		wcc_data    dir_wcc;
 *	};
 *
 *	union REMOVE3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		REMOVE3resok   resok;
 *	default:
 *		REMOVE3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs_removeres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result->dir_attr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.14  RENAME3res
 *
 *	struct RENAME3resok {
 *		wcc_data	fromdir_wcc;
 *		wcc_data	todir_wcc;
 *	};
 *
 *	struct RENAME3resfail {
 *		wcc_data	fromdir_wcc;
 *		wcc_data	todir_wcc;
 *	};
 *
 *	union RENAME3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		RENAME3resok   resok;
 *	default:
 *		RENAME3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs_renameres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result->old_fattr);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result->new_fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.15  LINK3res
 *
 *	struct LINK3resok {
 *		post_op_attr	file_attributes;
 *		wcc_data	linkdir_wcc;
 *	};
 *
 *	struct LINK3resfail {
 *		post_op_attr	file_attributes;
 *		wcc_data	linkdir_wcc;
 *	};
 *
 *	union LINK3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		LINK3resok	resok;
 *	default:
 *		LINK3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, __be32 *p,
				 struct nfs3_linkres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result->dir_attr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/**
 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
 *			the local page cache
 * @xdr: XDR stream where entry resides
 * @entry: buffer to fill in with entry data
 * @plus: boolean indicating whether this should be a readdirplus entry
 *
1975 1976
 * Returns zero if successful, otherwise a negative errno value is
 * returned.
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
 *
 * This function is not invoked during READDIR reply decoding, but
 * rather whenever an application invokes the getdents(2) system call
 * on a directory already in our cache.
 *
 * 3.3.16  entry3
 *
 *	struct entry3 {
 *		fileid3		fileid;
 *		filename3	name;
 *		cookie3		cookie;
 *		fhandle3	filehandle;
 *		post_op_attr3	attributes;
 *		entry3		*nextentry;
 *	};
 *
 * 3.3.17  entryplus3
 *	struct entryplus3 {
 *		fileid3		fileid;
 *		filename3	name;
 *		cookie3		cookie;
 *		post_op_attr	name_attributes;
 *		post_op_fh3	name_handle;
 *		entryplus3	*nextentry;
 *	};
 */
2003 2004
int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
		       int plus)
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
{
	struct nfs_entry old = *entry;
	__be32 *p;
	int error;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p == xdr_zero) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(p == NULL))
			goto out_overflow;
		if (*p == xdr_zero)
2018
			return -EAGAIN;
2019
		entry->eof = 1;
2020
		return -EBADCOOKIE;
2021 2022 2023 2024
	}

	error = decode_fileid3(xdr, &entry->ino);
	if (unlikely(error))
2025
		return error;
2026 2027 2028

	error = decode_inline_filename3(xdr, &entry->name, &entry->len);
	if (unlikely(error))
2029
		return error;
2030 2031 2032 2033

	entry->prev_cookie = entry->cookie;
	error = decode_cookie3(xdr, &entry->cookie);
	if (unlikely(error))
2034
		return error;
2035 2036 2037 2038 2039 2040 2041

	entry->d_type = DT_UNKNOWN;

	if (plus) {
		entry->fattr->valid = 0;
		error = decode_post_op_attr(xdr, entry->fattr);
		if (unlikely(error))
2042
			return error;
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
		if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
			entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);

		/* In fact, a post_op_fh3: */
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(p == NULL))
			goto out_overflow;
		if (*p != xdr_zero) {
			error = decode_nfs_fh3(xdr, entry->fh);
			if (unlikely(error)) {
				if (error == -E2BIG)
					goto out_truncated;
2055
				return error;
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
			}
		} else
			zero_nfs_fh3(entry->fh);
	}

	/* Peek at the next entry to see if we're at EOD */
	p = xdr_inline_peek(xdr, 4 + 4);
	entry->eof = 0;
	if (p != NULL)
		entry->eof = (p[0] == xdr_zero) && (p[1] != xdr_zero);
2066
	return 0;
2067 2068 2069

out_overflow:
	print_overflow_msg(__func__, xdr);
2070
	return -EAGAIN;
2071 2072 2073
out_truncated:
	dprintk("NFS: directory entry contains invalid file handle\n");
	*entry = old;
2074
	return -EAGAIN;
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 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 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 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 2272 2273 2274 2275 2276 2277 2278
}

/*
 * 3.3.16  READDIR3res
 *
 *	struct dirlist3 {
 *		entry3		*entries;
 *		bool		eof;
 *	};
 *
 *	struct READDIR3resok {
 *		post_op_attr	dir_attributes;
 *		cookieverf3	cookieverf;
 *		dirlist3	reply;
 *	};
 *
 *	struct READDIR3resfail {
 *		post_op_attr	dir_attributes;
 *	};
 *
 *	union READDIR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		READDIR3resok	resok;
 *	default:
 *		READDIR3resfail	resfail;
 *	};
 *
 * Read the directory contents into the page cache, but otherwise
 * don't touch them.  The actual decoding is done by nfs3_decode_entry()
 * during subsequent nfs_readdir() calls.
 */
static int decode_dirlist3(struct xdr_stream *xdr)
{
	u32 recvd, pglen;
	size_t hdrlen;

	pglen = xdr->buf->page_len;
	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
	recvd = xdr->buf->len - hdrlen;
	if (unlikely(pglen > recvd))
		goto out_cheating;
out:
	xdr_read_pages(xdr, pglen);
	return pglen;
out_cheating:
	dprintk("NFS: server cheating in readdir result: "
		"pglen %u > recvd %u\n", pglen, recvd);
	pglen = recvd;
	goto out;
}

static int decode_readdir3resok(struct xdr_stream *xdr,
				struct nfs3_readdirres *result)
{
	int error;

	error = decode_post_op_attr(xdr, result->dir_attr);
	if (unlikely(error))
		goto out;
	/* XXX: do we need to check if result->verf != NULL ? */
	error = decode_cookieverf3(xdr, result->verf);
	if (unlikely(error))
		goto out;
	error = decode_dirlist3(xdr);
out:
	return error;
}

static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req, __be32 *p,
				    struct nfs3_readdirres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_readdir3resok(&xdr, result);
out:
	return error;
out_default:
	error = decode_post_op_attr(&xdr, result->dir_attr);
	if (unlikely(error))
		goto out;
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.18  FSSTAT3res
 *
 *	struct FSSTAT3resok {
 *		post_op_attr	obj_attributes;
 *		size3		tbytes;
 *		size3		fbytes;
 *		size3		abytes;
 *		size3		tfiles;
 *		size3		ffiles;
 *		size3		afiles;
 *		uint32		invarsec;
 *	};
 *
 *	struct FSSTAT3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union FSSTAT3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		FSSTAT3resok	resok;
 *	default:
 *		FSSTAT3resfail	resfail;
 *	};
 */
static int decode_fsstat3resok(struct xdr_stream *xdr,
			       struct nfs_fsstat *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 8 * 6 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	p = xdr_decode_size3(p, &result->tbytes);
	p = xdr_decode_size3(p, &result->fbytes);
	p = xdr_decode_size3(p, &result->abytes);
	p = xdr_decode_size3(p, &result->tfiles);
	p = xdr_decode_size3(p, &result->ffiles);
	xdr_decode_size3(p, &result->afiles);
	/* ignore invarsec */
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs_fsstat *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_fsstat3resok(&xdr, result);
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.19  FSINFO3res
 *
 *	struct FSINFO3resok {
 *		post_op_attr	obj_attributes;
 *		uint32		rtmax;
 *		uint32		rtpref;
 *		uint32		rtmult;
 *		uint32		wtmax;
 *		uint32		wtpref;
 *		uint32		wtmult;
 *		uint32		dtpref;
 *		size3		maxfilesize;
 *		nfstime3	time_delta;
 *		uint32		properties;
 *	};
 *
 *	struct FSINFO3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union FSINFO3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		FSINFO3resok	resok;
 *	default:
 *		FSINFO3resfail	resfail;
 *	};
 */
static int decode_fsinfo3resok(struct xdr_stream *xdr,
			       struct nfs_fsinfo *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	result->rtmax  = be32_to_cpup(p++);
	result->rtpref = be32_to_cpup(p++);
	result->rtmult = be32_to_cpup(p++);
	result->wtmax  = be32_to_cpup(p++);
	result->wtpref = be32_to_cpup(p++);
	result->wtmult = be32_to_cpup(p++);
	result->dtpref = be32_to_cpup(p++);
	p = xdr_decode_size3(p, &result->maxfilesize);
2279
	xdr_decode_nfstime3(p, &result->time_delta);
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 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 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417

	/* ignore properties */
	result->lease_time = 0;
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs_fsinfo *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_fsinfo3resok(&xdr, result);
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.20  PATHCONF3res
 *
 *	struct PATHCONF3resok {
 *		post_op_attr	obj_attributes;
 *		uint32		linkmax;
 *		uint32		name_max;
 *		bool		no_trunc;
 *		bool		chown_restricted;
 *		bool		case_insensitive;
 *		bool		case_preserving;
 *	};
 *
 *	struct PATHCONF3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union PATHCONF3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		PATHCONF3resok	resok;
 *	default:
 *		PATHCONF3resfail resfail;
 *	};
 */
static int decode_pathconf3resok(struct xdr_stream *xdr,
				 struct nfs_pathconf *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 * 6);
	if (unlikely(p == NULL))
		goto out_overflow;
	result->max_link = be32_to_cpup(p++);
	result->max_namelen = be32_to_cpup(p);
	/* ignore remaining fields */
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req, __be32 *p,
				     struct nfs_pathconf *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_pathconf3resok(&xdr, result);
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

/*
 * 3.3.21  COMMIT3res
 *
 *	struct COMMIT3resok {
 *		wcc_data	file_wcc;
 *		writeverf3	verf;
 *	};
 *
 *	struct COMMIT3resfail {
 *		wcc_data	file_wcc;
 *	};
 *
 *	union COMMIT3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		COMMIT3resok	resok;
 *	default:
 *		COMMIT3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs_writeres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	error = decode_wcc_data(&xdr, result->fattr);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_writeverf3(&xdr, result->verf->verifier);
out:
	return error;
out_status:
	return nfs_stat_to_errno(status);
}

2418 2419
#ifdef CONFIG_NFS_V3_ACL

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 2468 2469 2470 2471 2472 2473 2474 2475 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
static inline int decode_getacl3resok(struct xdr_stream *xdr,
				      struct nfs3_getaclres *result)
{
	struct posix_acl **acl;
	unsigned int *aclcnt;
	size_t hdrlen;
	int error;

	error = decode_post_op_attr(xdr, result->fattr);
	if (unlikely(error))
		goto out;
	error = decode_uint32(xdr, &result->mask);
	if (unlikely(error))
		goto out;
	error = -EINVAL;
	if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
		goto out;

	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;

	acl = NULL;
	if (result->mask & NFS_ACL)
		acl = &result->acl_access;
	aclcnt = NULL;
	if (result->mask & NFS_ACLCNT)
		aclcnt = &result->acl_access_count;
	error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
	if (unlikely(error <= 0))
		goto out;

	acl = NULL;
	if (result->mask & NFS_DFACL)
		acl = &result->acl_default;
	aclcnt = NULL;
	if (result->mask & NFS_DFACLCNT)
		aclcnt = &result->acl_default_count;
	error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
	if (unlikely(error <= 0))
		return error;
	error = 0;
out:
	return error;
}

static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs3_getaclres *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_getacl3resok(&xdr, result);
out:
	return error;
out_default:
	return nfs_stat_to_errno(status);
}

static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req, __be32 *p,
				   struct nfs_fattr *result)
{
	struct xdr_stream xdr;
	enum nfs_stat status;
	int error;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	error = decode_nfsstat3(&xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_post_op_attr(&xdr, result);
out:
	return error;
out_default:
	return nfs_stat_to_errno(status);
}

2504 2505
#endif  /* CONFIG_NFS_V3_ACL */

L
Linus Torvalds 已提交
2506 2507 2508
#define PROC(proc, argtype, restype, timer)				\
[NFS3PROC_##proc] = {							\
	.p_proc      = NFS3PROC_##proc,					\
2509
	.p_encode    = (kxdrproc_t)nfs3_xdr_enc_##argtype##3args,	\
2510
	.p_decode    = (kxdrproc_t)nfs3_xdr_dec_##restype##3res,	\
2511
	.p_arglen    = NFS3_##argtype##args_sz,				\
2512
	.p_replen    = NFS3_##restype##res_sz,				\
2513 2514 2515
	.p_timer     = timer,						\
	.p_statidx   = NFS3PROC_##proc,					\
	.p_name      = #proc,						\
L
Linus Torvalds 已提交
2516 2517 2518
	}

struct rpc_procinfo	nfs3_procedures[] = {
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
	PROC(GETATTR,		getattr,	getattr,	1),
	PROC(SETATTR,		setattr,	setattr,	0),
	PROC(LOOKUP,		lookup,		lookup,		2),
	PROC(ACCESS,		access,		access,		1),
	PROC(READLINK,		readlink,	readlink,	3),
	PROC(READ,		read,		read,		3),
	PROC(WRITE,		write,		write,		4),
	PROC(CREATE,		create,		create,		0),
	PROC(MKDIR,		mkdir,		create,		0),
	PROC(SYMLINK,		symlink,	create,		0),
	PROC(MKNOD,		mknod,		create,		0),
	PROC(REMOVE,		remove,		remove,		0),
	PROC(RMDIR,		lookup,		setattr,	0),
	PROC(RENAME,		rename,		rename,		0),
	PROC(LINK,		link,		link,		0),
	PROC(READDIR,		readdir,	readdir,	3),
	PROC(READDIRPLUS,	readdirplus,	readdir,	3),
	PROC(FSSTAT,		getattr,	fsstat,		0),
	PROC(FSINFO,		getattr,	fsinfo,		0),
	PROC(PATHCONF,		getattr,	pathconf,	0),
	PROC(COMMIT,		commit,		commit,		5),
L
Linus Torvalds 已提交
2540 2541 2542 2543
};

struct rpc_version		nfs_version3 = {
	.number			= 3,
2544
	.nrprocs		= ARRAY_SIZE(nfs3_procedures),
L
Linus Torvalds 已提交
2545 2546 2547
	.procs			= nfs3_procedures
};

2548 2549 2550 2551
#ifdef CONFIG_NFS_V3_ACL
static struct rpc_procinfo	nfs3_acl_procedures[] = {
	[ACLPROC3_GETACL] = {
		.p_proc = ACLPROC3_GETACL,
2552
		.p_encode = (kxdrproc_t)nfs3_xdr_enc_getacl3args,
2553
		.p_decode = (kxdrproc_t)nfs3_xdr_dec_getacl3res,
2554 2555
		.p_arglen = ACL3_getaclargs_sz,
		.p_replen = ACL3_getaclres_sz,
2556
		.p_timer = 1,
2557
		.p_name = "GETACL",
2558 2559 2560
	},
	[ACLPROC3_SETACL] = {
		.p_proc = ACLPROC3_SETACL,
2561
		.p_encode = (kxdrproc_t)nfs3_xdr_enc_setacl3args,
2562
		.p_decode = (kxdrproc_t)nfs3_xdr_dec_setacl3res,
2563 2564
		.p_arglen = ACL3_setaclargs_sz,
		.p_replen = ACL3_setaclres_sz,
2565
		.p_timer = 0,
2566
		.p_name = "SETACL",
2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
	},
};

struct rpc_version		nfsacl_version3 = {
	.number			= 3,
	.nrprocs		= sizeof(nfs3_acl_procedures)/
				  sizeof(nfs3_acl_procedures[0]),
	.procs			= nfs3_acl_procedures,
};
#endif  /* CONFIG_NFS_V3_ACL */