Blame view
net/sunrpc/xdr.c
30.9 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 |
/* * linux/net/sunrpc/xdr.c * * Generic XDR support. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ |
a246b0105 [PATCH] RPC: intr... |
8 |
#include <linux/module.h> |
5a0e3ad6a include cleanup: ... |
9 |
#include <linux/slab.h> |
1da177e4c Linux-2.6.12-rc2 |
10 |
#include <linux/types.h> |
1da177e4c Linux-2.6.12-rc2 |
11 12 13 14 |
#include <linux/string.h> #include <linux/kernel.h> #include <linux/pagemap.h> #include <linux/errno.h> |
1da177e4c Linux-2.6.12-rc2 |
15 16 17 18 19 20 |
#include <linux/sunrpc/xdr.h> #include <linux/sunrpc/msg_prot.h> /* * XDR functions for basic NFS types */ |
d8ed029d6 [SUNRPC]: trivial... |
21 22 |
__be32 * xdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj) |
1da177e4c Linux-2.6.12-rc2 |
23 24 25 26 |
{ unsigned int quadlen = XDR_QUADLEN(obj->len); p[quadlen] = 0; /* zero trailing bytes */ |
9f162d2a8 sunrpc: hton -> c... |
27 |
*p++ = cpu_to_be32(obj->len); |
1da177e4c Linux-2.6.12-rc2 |
28 29 30 |
memcpy(p, obj->data, obj->len); return p + XDR_QUADLEN(obj->len); } |
468039ee4 SUNRPC: Convert t... |
31 |
EXPORT_SYMBOL_GPL(xdr_encode_netobj); |
1da177e4c Linux-2.6.12-rc2 |
32 |
|
d8ed029d6 [SUNRPC]: trivial... |
33 34 |
__be32 * xdr_decode_netobj(__be32 *p, struct xdr_netobj *obj) |
1da177e4c Linux-2.6.12-rc2 |
35 36 |
{ unsigned int len; |
98866b5ab sunrpc: ntoh -> b... |
37 |
if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ) |
1da177e4c Linux-2.6.12-rc2 |
38 39 40 41 42 |
return NULL; obj->len = len; obj->data = (u8 *) p; return p + XDR_QUADLEN(len); } |
468039ee4 SUNRPC: Convert t... |
43 |
EXPORT_SYMBOL_GPL(xdr_decode_netobj); |
1da177e4c Linux-2.6.12-rc2 |
44 45 46 |
/** * xdr_encode_opaque_fixed - Encode fixed length opaque data |
4dc3b16ba [PATCH] DocBook: ... |
47 48 49 |
* @p: pointer to current position in XDR buffer. * @ptr: pointer to data to encode (or NULL) * @nbytes: size of data. |
1da177e4c Linux-2.6.12-rc2 |
50 51 52 53 54 55 56 57 58 |
* * Copy the array of data of length nbytes at ptr to the XDR buffer * at position p, then align to the next 32-bit boundary by padding * with zero bytes (see RFC1832). * Note: if ptr is NULL, only the padding is performed. * * Returns the updated current XDR buffer position * */ |
d8ed029d6 [SUNRPC]: trivial... |
59 |
__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes) |
1da177e4c Linux-2.6.12-rc2 |
60 61 62 63 64 65 66 67 68 69 70 71 72 |
{ if (likely(nbytes != 0)) { unsigned int quadlen = XDR_QUADLEN(nbytes); unsigned int padding = (quadlen << 2) - nbytes; if (ptr != NULL) memcpy(p, ptr, nbytes); if (padding != 0) memset((char *)p + nbytes, 0, padding); p += quadlen; } return p; } |
468039ee4 SUNRPC: Convert t... |
73 |
EXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed); |
1da177e4c Linux-2.6.12-rc2 |
74 75 76 |
/** * xdr_encode_opaque - Encode variable length opaque data |
4dc3b16ba [PATCH] DocBook: ... |
77 78 79 |
* @p: pointer to current position in XDR buffer. * @ptr: pointer to data to encode (or NULL) * @nbytes: size of data. |
1da177e4c Linux-2.6.12-rc2 |
80 81 82 |
* * Returns the updated current XDR buffer position */ |
d8ed029d6 [SUNRPC]: trivial... |
83 |
__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes) |
1da177e4c Linux-2.6.12-rc2 |
84 |
{ |
9f162d2a8 sunrpc: hton -> c... |
85 |
*p++ = cpu_to_be32(nbytes); |
1da177e4c Linux-2.6.12-rc2 |
86 87 |
return xdr_encode_opaque_fixed(p, ptr, nbytes); } |
468039ee4 SUNRPC: Convert t... |
88 |
EXPORT_SYMBOL_GPL(xdr_encode_opaque); |
1da177e4c Linux-2.6.12-rc2 |
89 |
|
d8ed029d6 [SUNRPC]: trivial... |
90 91 |
__be32 * xdr_encode_string(__be32 *p, const char *string) |
1da177e4c Linux-2.6.12-rc2 |
92 93 94 |
{ return xdr_encode_array(p, string, strlen(string)); } |
468039ee4 SUNRPC: Convert t... |
95 |
EXPORT_SYMBOL_GPL(xdr_encode_string); |
1da177e4c Linux-2.6.12-rc2 |
96 |
|
d8ed029d6 [SUNRPC]: trivial... |
97 |
__be32 * |
e5cff482c SUNRPC: Use unsig... |
98 99 |
xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp, unsigned int maxlen) |
1da177e4c Linux-2.6.12-rc2 |
100 |
{ |
e5cff482c SUNRPC: Use unsig... |
101 |
u32 len; |
1da177e4c Linux-2.6.12-rc2 |
102 |
|
98866b5ab sunrpc: ntoh -> b... |
103 |
len = be32_to_cpu(*p++); |
e5cff482c SUNRPC: Use unsig... |
104 |
if (len > maxlen) |
1da177e4c Linux-2.6.12-rc2 |
105 106 107 108 109 |
return NULL; *lenp = len; *sp = (char *) p; return p + XDR_QUADLEN(len); } |
468039ee4 SUNRPC: Convert t... |
110 |
EXPORT_SYMBOL_GPL(xdr_decode_string_inplace); |
1da177e4c Linux-2.6.12-rc2 |
111 |
|
b4687da7f SUNRPC: Refactor ... |
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 |
/** * xdr_terminate_string - '\0'-terminate a string residing in an xdr_buf * @buf: XDR buffer where string resides * @len: length of string, in bytes * */ void xdr_terminate_string(struct xdr_buf *buf, const u32 len) { char *kaddr; kaddr = kmap_atomic(buf->pages[0], KM_USER0); kaddr[buf->page_base + len] = '\0'; kunmap_atomic(kaddr, KM_USER0); } |
0d961aa93 SUNRPC: Convert t... |
127 |
EXPORT_SYMBOL_GPL(xdr_terminate_string); |
b4687da7f SUNRPC: Refactor ... |
128 |
|
1da177e4c Linux-2.6.12-rc2 |
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 |
void xdr_encode_pages(struct xdr_buf *xdr, struct page **pages, unsigned int base, unsigned int len) { struct kvec *tail = xdr->tail; u32 *p; xdr->pages = pages; xdr->page_base = base; xdr->page_len = len; p = (u32 *)xdr->head[0].iov_base + XDR_QUADLEN(xdr->head[0].iov_len); tail->iov_base = p; tail->iov_len = 0; if (len & 3) { unsigned int pad = 4 - (len & 3); *p = 0; tail->iov_base = (char *)p + (len & 3); tail->iov_len = pad; len += pad; } xdr->buflen += len; xdr->len += len; } |
468039ee4 SUNRPC: Convert t... |
155 |
EXPORT_SYMBOL_GPL(xdr_encode_pages); |
1da177e4c Linux-2.6.12-rc2 |
156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 |
void xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset, struct page **pages, unsigned int base, unsigned int len) { struct kvec *head = xdr->head; struct kvec *tail = xdr->tail; char *buf = (char *)head->iov_base; unsigned int buflen = head->iov_len; head->iov_len = offset; xdr->pages = pages; xdr->page_base = base; xdr->page_len = len; tail->iov_base = buf + offset; tail->iov_len = buflen - offset; xdr->buflen += len; } |
468039ee4 SUNRPC: Convert t... |
177 |
EXPORT_SYMBOL_GPL(xdr_inline_pages); |
1da177e4c Linux-2.6.12-rc2 |
178 |
|
1da177e4c Linux-2.6.12-rc2 |
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 |
/* * Helper routines for doing 'memmove' like operations on a struct xdr_buf * * _shift_data_right_pages * @pages: vector of pages containing both the source and dest memory area. * @pgto_base: page vector address of destination * @pgfrom_base: page vector address of source * @len: number of bytes to copy * * Note: the addresses pgto_base and pgfrom_base are both calculated in * the same way: * if a memory area starts at byte 'base' in page 'pages[i]', * then its address is given as (i << PAGE_CACHE_SHIFT) + base * Also note: pgfrom_base must be < pgto_base, but the memory areas * they point to may overlap. */ static void _shift_data_right_pages(struct page **pages, size_t pgto_base, size_t pgfrom_base, size_t len) { struct page **pgfrom, **pgto; char *vfrom, *vto; size_t copy; BUG_ON(pgto_base <= pgfrom_base); pgto_base += len; pgfrom_base += len; pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT); pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT); pgto_base &= ~PAGE_CACHE_MASK; pgfrom_base &= ~PAGE_CACHE_MASK; do { /* Are any pointers crossing a page boundary? */ if (pgto_base == 0) { |
1da177e4c Linux-2.6.12-rc2 |
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 |
pgto_base = PAGE_CACHE_SIZE; pgto--; } if (pgfrom_base == 0) { pgfrom_base = PAGE_CACHE_SIZE; pgfrom--; } copy = len; if (copy > pgto_base) copy = pgto_base; if (copy > pgfrom_base) copy = pgfrom_base; pgto_base -= copy; pgfrom_base -= copy; vto = kmap_atomic(*pgto, KM_USER0); vfrom = kmap_atomic(*pgfrom, KM_USER1); memmove(vto + pgto_base, vfrom + pgfrom_base, copy); |
bce3481c9 This fixes a pani... |
236 |
flush_dcache_page(*pgto); |
1da177e4c Linux-2.6.12-rc2 |
237 238 239 240 |
kunmap_atomic(vfrom, KM_USER1); kunmap_atomic(vto, KM_USER0); } while ((len -= copy) != 0); |
1da177e4c Linux-2.6.12-rc2 |
241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 |
} /* * _copy_to_pages * @pages: array of pages * @pgbase: page vector address of destination * @p: pointer to source data * @len: length * * Copies data from an arbitrary memory location into an array of pages * The copy is assumed to be non-overlapping. */ static void _copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len) { struct page **pgto; char *vto; size_t copy; pgto = pages + (pgbase >> PAGE_CACHE_SHIFT); pgbase &= ~PAGE_CACHE_MASK; |
daeba89d4 SUNRPC: don't cal... |
262 |
for (;;) { |
1da177e4c Linux-2.6.12-rc2 |
263 264 265 266 267 268 269 |
copy = PAGE_CACHE_SIZE - pgbase; if (copy > len) copy = len; vto = kmap_atomic(*pgto, KM_USER0); memcpy(vto + pgbase, p, copy); kunmap_atomic(vto, KM_USER0); |
daeba89d4 SUNRPC: don't cal... |
270 271 272 |
len -= copy; if (len == 0) break; |
1da177e4c Linux-2.6.12-rc2 |
273 274 275 276 277 278 279 |
pgbase += copy; if (pgbase == PAGE_CACHE_SIZE) { flush_dcache_page(*pgto); pgbase = 0; pgto++; } p += copy; |
daeba89d4 SUNRPC: don't cal... |
280 |
} |
1da177e4c Linux-2.6.12-rc2 |
281 282 283 284 285 286 287 288 289 290 291 292 293 |
flush_dcache_page(*pgto); } /* * _copy_from_pages * @p: pointer to destination * @pages: array of pages * @pgbase: offset of source data * @len: length * * Copies data into an arbitrary memory location from an array of pages * The copy is assumed to be non-overlapping. */ |
bf118a342 NFSv4: include bi... |
294 |
void |
1da177e4c Linux-2.6.12-rc2 |
295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 |
_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len) { struct page **pgfrom; char *vfrom; size_t copy; pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT); pgbase &= ~PAGE_CACHE_MASK; do { copy = PAGE_CACHE_SIZE - pgbase; if (copy > len) copy = len; vfrom = kmap_atomic(*pgfrom, KM_USER0); memcpy(p, vfrom + pgbase, copy); kunmap_atomic(vfrom, KM_USER0); pgbase += copy; if (pgbase == PAGE_CACHE_SIZE) { pgbase = 0; pgfrom++; } p += copy; } while ((len -= copy) != 0); } |
bf118a342 NFSv4: include bi... |
322 |
EXPORT_SYMBOL_GPL(_copy_from_pages); |
1da177e4c Linux-2.6.12-rc2 |
323 324 325 326 327 328 |
/* * xdr_shrink_bufhead * @buf: xdr_buf * @len: bytes to remove from buf->head[0] * |
cca5172a7 [NET] SUNRPC: Fix... |
329 |
* Shrinks XDR buffer's header kvec buf->head[0] by |
1da177e4c Linux-2.6.12-rc2 |
330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 |
* 'len' bytes. The extra data is not lost, but is instead * moved into the inlined pages and/or the tail. */ static void xdr_shrink_bufhead(struct xdr_buf *buf, size_t len) { struct kvec *head, *tail; size_t copy, offs; unsigned int pglen = buf->page_len; tail = buf->tail; head = buf->head; BUG_ON (len > head->iov_len); /* Shift the tail first */ if (tail->iov_len != 0) { if (tail->iov_len > len) { copy = tail->iov_len - len; memmove((char *)tail->iov_base + len, tail->iov_base, copy); } /* Copy from the inlined pages into the tail */ copy = len; if (copy > pglen) copy = pglen; offs = len - copy; if (offs >= tail->iov_len) copy = 0; else if (copy > tail->iov_len - offs) copy = tail->iov_len - offs; if (copy != 0) _copy_from_pages((char *)tail->iov_base + offs, buf->pages, buf->page_base + pglen + offs - len, copy); /* Do we also need to copy data from the head into the tail ? */ if (len > pglen) { offs = copy = len - pglen; if (copy > tail->iov_len) copy = tail->iov_len; memcpy(tail->iov_base, (char *)head->iov_base + head->iov_len - offs, copy); } } /* Now handle pages */ if (pglen != 0) { if (pglen > len) _shift_data_right_pages(buf->pages, buf->page_base + len, buf->page_base, pglen - len); copy = len; if (len > pglen) copy = pglen; _copy_to_pages(buf->pages, buf->page_base, (char *)head->iov_base + head->iov_len - len, copy); } head->iov_len -= len; buf->buflen -= len; /* Have we truncated the message? */ if (buf->len > buf->buflen) buf->len = buf->buflen; } /* * xdr_shrink_pagelen * @buf: xdr_buf * @len: bytes to remove from buf->pages * |
cca5172a7 [NET] SUNRPC: Fix... |
402 |
* Shrinks XDR buffer's page array buf->pages by |
1da177e4c Linux-2.6.12-rc2 |
403 404 405 406 407 408 409 410 |
* 'len' bytes. The extra data is not lost, but is instead * moved into the tail. */ static void xdr_shrink_pagelen(struct xdr_buf *buf, size_t len) { struct kvec *tail; size_t copy; |
1da177e4c Linux-2.6.12-rc2 |
411 |
unsigned int pglen = buf->page_len; |
cf187c2d7 SUNRPC: Don't tru... |
412 |
unsigned int tailbuf_len; |
1da177e4c Linux-2.6.12-rc2 |
413 414 415 |
tail = buf->tail; BUG_ON (len > pglen); |
cf187c2d7 SUNRPC: Don't tru... |
416 |
tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len; |
1da177e4c Linux-2.6.12-rc2 |
417 |
/* Shift the tail first */ |
cf187c2d7 SUNRPC: Don't tru... |
418 419 420 421 422 423 |
if (tailbuf_len != 0) { unsigned int free_space = tailbuf_len - tail->iov_len; if (len < free_space) free_space = len; tail->iov_len += free_space; |
42d6d8ab5 sunrpc: simplify ... |
424 |
copy = len; |
1da177e4c Linux-2.6.12-rc2 |
425 |
if (tail->iov_len > len) { |
0fe62a359 sunrpc: clean up ... |
426 |
char *p = (char *)tail->iov_base + len; |
2e29ebb81 sunrpc: don't use... |
427 |
memmove(p, tail->iov_base, tail->iov_len - len); |
42d6d8ab5 sunrpc: simplify ... |
428 |
} else |
1da177e4c Linux-2.6.12-rc2 |
429 |
copy = tail->iov_len; |
42d6d8ab5 sunrpc: simplify ... |
430 |
/* Copy from the inlined pages into the tail */ |
1da177e4c Linux-2.6.12-rc2 |
431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 |
_copy_from_pages((char *)tail->iov_base, buf->pages, buf->page_base + pglen - len, copy); } buf->page_len -= len; buf->buflen -= len; /* Have we truncated the message? */ if (buf->len > buf->buflen) buf->len = buf->buflen; } void xdr_shift_buf(struct xdr_buf *buf, size_t len) { xdr_shrink_bufhead(buf, len); } |
468039ee4 SUNRPC: Convert t... |
447 |
EXPORT_SYMBOL_GPL(xdr_shift_buf); |
1da177e4c Linux-2.6.12-rc2 |
448 449 450 451 452 453 454 455 456 457 458 459 460 461 |
/** * xdr_init_encode - Initialize a struct xdr_stream for sending data. * @xdr: pointer to xdr_stream struct * @buf: pointer to XDR buffer in which to encode data * @p: current pointer inside XDR buffer * * Note: at the moment the RPC client only passes the length of our * scratch buffer in the xdr_buf's header kvec. Previously this * meant we needed to call xdr_adjust_iovec() after encoding the * data. With the new scheme, the xdr_stream manages the details * of the buffer length, and takes care of adjusting the kvec * length for us. */ |
d8ed029d6 [SUNRPC]: trivial... |
462 |
void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) |
1da177e4c Linux-2.6.12-rc2 |
463 464 |
{ struct kvec *iov = buf->head; |
334ccfd54 [PATCH] RPC: Ensu... |
465 |
int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len; |
1da177e4c Linux-2.6.12-rc2 |
466 |
|
334ccfd54 [PATCH] RPC: Ensu... |
467 |
BUG_ON(scratch_len < 0); |
1da177e4c Linux-2.6.12-rc2 |
468 469 |
xdr->buf = buf; xdr->iov = iov; |
d8ed029d6 [SUNRPC]: trivial... |
470 471 |
xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len); xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len); |
334ccfd54 [PATCH] RPC: Ensu... |
472 473 474 475 476 477 478 479 480 481 482 |
BUG_ON(iov->iov_len > scratch_len); if (p != xdr->p && p != NULL) { size_t len; BUG_ON(p < xdr->p || p > xdr->end); len = (char *)p - (char *)xdr->p; xdr->p = p; buf->len += len; iov->iov_len += len; } |
1da177e4c Linux-2.6.12-rc2 |
483 |
} |
468039ee4 SUNRPC: Convert t... |
484 |
EXPORT_SYMBOL_GPL(xdr_init_encode); |
1da177e4c Linux-2.6.12-rc2 |
485 486 487 488 489 490 491 492 493 494 |
/** * xdr_reserve_space - Reserve buffer space for sending * @xdr: pointer to xdr_stream * @nbytes: number of bytes to reserve * * Checks that we have enough buffer space to encode 'nbytes' more * bytes of data. If so, update the total xdr_buf length, and * adjust the length of the current kvec. */ |
d8ed029d6 [SUNRPC]: trivial... |
495 |
__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes) |
1da177e4c Linux-2.6.12-rc2 |
496 |
{ |
d8ed029d6 [SUNRPC]: trivial... |
497 498 |
__be32 *p = xdr->p; __be32 *q; |
1da177e4c Linux-2.6.12-rc2 |
499 500 501 502 503 504 505 506 507 508 509 510 |
/* align nbytes on the next 32-bit boundary */ nbytes += 3; nbytes &= ~3; q = p + (nbytes >> 2); if (unlikely(q > xdr->end || q < p)) return NULL; xdr->p = q; xdr->iov->iov_len += nbytes; xdr->buf->len += nbytes; return p; } |
468039ee4 SUNRPC: Convert t... |
511 |
EXPORT_SYMBOL_GPL(xdr_reserve_space); |
1da177e4c Linux-2.6.12-rc2 |
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 |
/** * xdr_write_pages - Insert a list of pages into an XDR buffer for sending * @xdr: pointer to xdr_stream * @pages: list of pages * @base: offset of first byte * @len: length of data in bytes * */ void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base, unsigned int len) { struct xdr_buf *buf = xdr->buf; struct kvec *iov = buf->tail; buf->pages = pages; buf->page_base = base; buf->page_len = len; iov->iov_base = (char *)xdr->p; iov->iov_len = 0; xdr->iov = iov; if (len & 3) { unsigned int pad = 4 - (len & 3); BUG_ON(xdr->p >= xdr->end); iov->iov_base = (char *)xdr->p + (len & 3); iov->iov_len += pad; len += pad; *xdr->p++ = 0; } buf->buflen += len; buf->len += len; } |
468039ee4 SUNRPC: Convert t... |
546 |
EXPORT_SYMBOL_GPL(xdr_write_pages); |
1da177e4c Linux-2.6.12-rc2 |
547 |
|
6650239a4 NFS: Don't use vm... |
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
static void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov, __be32 *p, unsigned int len) { if (len > iov->iov_len) len = iov->iov_len; if (p == NULL) p = (__be32*)iov->iov_base; xdr->p = p; xdr->end = (__be32*)(iov->iov_base + len); xdr->iov = iov; xdr->page_ptr = NULL; } static int xdr_set_page_base(struct xdr_stream *xdr, unsigned int base, unsigned int len) { unsigned int pgnr; unsigned int maxlen; unsigned int pgoff; unsigned int pgend; void *kaddr; maxlen = xdr->buf->page_len; if (base >= maxlen) return -EINVAL; maxlen -= base; if (len > maxlen) len = maxlen; base += xdr->buf->page_base; pgnr = base >> PAGE_SHIFT; xdr->page_ptr = &xdr->buf->pages[pgnr]; kaddr = page_address(*xdr->page_ptr); pgoff = base & ~PAGE_MASK; xdr->p = (__be32*)(kaddr + pgoff); pgend = pgoff + len; if (pgend > PAGE_SIZE) pgend = PAGE_SIZE; xdr->end = (__be32*)(kaddr + pgend); xdr->iov = NULL; return 0; } static void xdr_set_next_page(struct xdr_stream *xdr) { unsigned int newbase; newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT; newbase -= xdr->buf->page_base; if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0) xdr_set_iov(xdr, xdr->buf->tail, NULL, xdr->buf->len); } static bool xdr_set_next_buffer(struct xdr_stream *xdr) { if (xdr->page_ptr != NULL) xdr_set_next_page(xdr); else if (xdr->iov == xdr->buf->head) { if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0) xdr_set_iov(xdr, xdr->buf->tail, NULL, xdr->buf->len); } return xdr->p != xdr->end; } |
1da177e4c Linux-2.6.12-rc2 |
615 616 617 618 619 620 |
/** * xdr_init_decode - Initialize an xdr_stream for decoding data. * @xdr: pointer to xdr_stream struct * @buf: pointer to XDR buffer from which to decode data * @p: current pointer inside XDR buffer */ |
d8ed029d6 [SUNRPC]: trivial... |
621 |
void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) |
1da177e4c Linux-2.6.12-rc2 |
622 |
{ |
1da177e4c Linux-2.6.12-rc2 |
623 |
xdr->buf = buf; |
6650239a4 NFS: Don't use vm... |
624 625 626 627 628 629 |
xdr->scratch.iov_base = NULL; xdr->scratch.iov_len = 0; if (buf->head[0].iov_len != 0) xdr_set_iov(xdr, buf->head, p, buf->len); else if (buf->page_len != 0) xdr_set_page_base(xdr, 0, buf->len); |
1da177e4c Linux-2.6.12-rc2 |
630 |
} |
468039ee4 SUNRPC: Convert t... |
631 |
EXPORT_SYMBOL_GPL(xdr_init_decode); |
1da177e4c Linux-2.6.12-rc2 |
632 |
|
f7da7a129 SUNRPC: introduce... |
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 |
/** * xdr_init_decode - Initialize an xdr_stream for decoding data. * @xdr: pointer to xdr_stream struct * @buf: pointer to XDR buffer from which to decode data * @pages: list of pages to decode into * @len: length in bytes of buffer in pages */ void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, struct page **pages, unsigned int len) { memset(buf, 0, sizeof(*buf)); buf->pages = pages; buf->page_len = len; buf->buflen = len; buf->len = len; xdr_init_decode(xdr, buf, NULL); } EXPORT_SYMBOL_GPL(xdr_init_decode_pages); |
6650239a4 NFS: Don't use vm... |
651 |
static __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) |
ba8e452a4 SUNRPC: Add a hel... |
652 653 654 655 656 657 |
{ __be32 *p = xdr->p; __be32 *q = p + XDR_QUADLEN(nbytes); if (unlikely(q > xdr->end || q < p)) return NULL; |
6650239a4 NFS: Don't use vm... |
658 |
xdr->p = q; |
ba8e452a4 SUNRPC: Add a hel... |
659 660 |
return p; } |
ba8e452a4 SUNRPC: Add a hel... |
661 662 |
/** |
6650239a4 NFS: Don't use vm... |
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 |
* xdr_set_scratch_buffer - Attach a scratch buffer for decoding data. * @xdr: pointer to xdr_stream struct * @buf: pointer to an empty buffer * @buflen: size of 'buf' * * The scratch buffer is used when decoding from an array of pages. * If an xdr_inline_decode() call spans across page boundaries, then * we copy the data into the scratch buffer in order to allow linear * access. */ void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen) { xdr->scratch.iov_base = buf; xdr->scratch.iov_len = buflen; } EXPORT_SYMBOL_GPL(xdr_set_scratch_buffer); static __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes) { __be32 *p; void *cpdest = xdr->scratch.iov_base; size_t cplen = (char *)xdr->end - (char *)xdr->p; if (nbytes > xdr->scratch.iov_len) return NULL; memcpy(cpdest, xdr->p, cplen); cpdest += cplen; nbytes -= cplen; if (!xdr_set_next_buffer(xdr)) return NULL; p = __xdr_inline_decode(xdr, nbytes); if (p == NULL) return NULL; memcpy(cpdest, p, nbytes); return xdr->scratch.iov_base; } /** * xdr_inline_decode - Retrieve XDR data to decode |
1da177e4c Linux-2.6.12-rc2 |
702 703 704 705 706 707 708 709 |
* @xdr: pointer to xdr_stream struct * @nbytes: number of bytes of data to decode * * Check if the input buffer is long enough to enable us to decode * 'nbytes' more bytes of data starting at the current position. * If so return the current pointer, then update the current * pointer position. */ |
d8ed029d6 [SUNRPC]: trivial... |
710 |
__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) |
1da177e4c Linux-2.6.12-rc2 |
711 |
{ |
6650239a4 NFS: Don't use vm... |
712 |
__be32 *p; |
1da177e4c Linux-2.6.12-rc2 |
713 |
|
6650239a4 NFS: Don't use vm... |
714 715 716 |
if (nbytes == 0) return xdr->p; if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr)) |
1da177e4c Linux-2.6.12-rc2 |
717 |
return NULL; |
6650239a4 NFS: Don't use vm... |
718 719 720 721 |
p = __xdr_inline_decode(xdr, nbytes); if (p != NULL) return p; return xdr_copy_to_scratch(xdr, nbytes); |
1da177e4c Linux-2.6.12-rc2 |
722 |
} |
468039ee4 SUNRPC: Convert t... |
723 |
EXPORT_SYMBOL_GPL(xdr_inline_decode); |
1da177e4c Linux-2.6.12-rc2 |
724 725 726 727 728 729 730 731 |
/** * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position * @xdr: pointer to xdr_stream struct * @len: number of bytes of page data * * Moves data beyond the current pointer position from the XDR head[] buffer * into the page list. Any data that lies beyond current position + "len" |
8b23ea7be RPC: Allow struc ... |
732 |
* bytes is moved into the XDR tail[]. |
1da177e4c Linux-2.6.12-rc2 |
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 |
*/ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len) { struct xdr_buf *buf = xdr->buf; struct kvec *iov; ssize_t shift; unsigned int end; int padding; /* Realign pages to current pointer position */ iov = buf->head; shift = iov->iov_len + (char *)iov->iov_base - (char *)xdr->p; if (shift > 0) xdr_shrink_bufhead(buf, shift); /* Truncate page data and move it into the tail */ if (buf->page_len > len) xdr_shrink_pagelen(buf, buf->page_len - len); padding = (XDR_QUADLEN(len) << 2) - len; xdr->iov = iov = buf->tail; /* Compute remaining message length. */ end = iov->iov_len; shift = buf->buflen - buf->len; if (shift < end) end -= shift; else if (shift > 0) end = 0; /* * Position current pointer at beginning of tail, and * set remaining message length. */ |
d8ed029d6 [SUNRPC]: trivial... |
764 765 |
xdr->p = (__be32 *)((char *)iov->iov_base + padding); xdr->end = (__be32 *)((char *)iov->iov_base + end); |
1da177e4c Linux-2.6.12-rc2 |
766 |
} |
468039ee4 SUNRPC: Convert t... |
767 |
EXPORT_SYMBOL_GPL(xdr_read_pages); |
1da177e4c Linux-2.6.12-rc2 |
768 |
|
8b23ea7be RPC: Allow struc ... |
769 770 771 772 773 774 775 776 777 778 779 780 |
/** * xdr_enter_page - decode data from the XDR page * @xdr: pointer to xdr_stream struct * @len: number of bytes of page data * * Moves data beyond the current pointer position from the XDR head[] buffer * into the page list. Any data that lies beyond current position + "len" * bytes is moved into the XDR tail[]. The current pointer is then * repositioned at the beginning of the first XDR page. */ void xdr_enter_page(struct xdr_stream *xdr, unsigned int len) { |
8b23ea7be RPC: Allow struc ... |
781 782 783 784 785 |
xdr_read_pages(xdr, len); /* * Position current pointer at beginning of tail, and * set remaining message length. */ |
6650239a4 NFS: Don't use vm... |
786 |
xdr_set_page_base(xdr, 0, len); |
8b23ea7be RPC: Allow struc ... |
787 |
} |
468039ee4 SUNRPC: Convert t... |
788 |
EXPORT_SYMBOL_GPL(xdr_enter_page); |
8b23ea7be RPC: Allow struc ... |
789 |
|
1da177e4c Linux-2.6.12-rc2 |
790 791 792 793 794 795 796 797 798 799 |
static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0}; void xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf) { buf->head[0] = *iov; buf->tail[0] = empty_iov; buf->page_len = 0; buf->buflen = buf->len = iov->iov_len; } |
468039ee4 SUNRPC: Convert t... |
800 |
EXPORT_SYMBOL_GPL(xdr_buf_from_iov); |
1da177e4c Linux-2.6.12-rc2 |
801 |
|
1da177e4c Linux-2.6.12-rc2 |
802 803 804 805 |
/* Sets subbuf to the portion of buf of length len beginning base bytes * from the start of buf. Returns -1 if base of length are out of bounds. */ int xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, |
1e78957e0 SUNRPC: Clean up ... |
806 |
unsigned int base, unsigned int len) |
1da177e4c Linux-2.6.12-rc2 |
807 |
{ |
1da177e4c Linux-2.6.12-rc2 |
808 |
subbuf->buflen = subbuf->len = len; |
1e78957e0 SUNRPC: Clean up ... |
809 810 811 812 813 814 815 816 817 818 819 |
if (base < buf->head[0].iov_len) { subbuf->head[0].iov_base = buf->head[0].iov_base + base; subbuf->head[0].iov_len = min_t(unsigned int, len, buf->head[0].iov_len - base); len -= subbuf->head[0].iov_len; base = 0; } else { subbuf->head[0].iov_base = NULL; subbuf->head[0].iov_len = 0; base -= buf->head[0].iov_len; } |
1da177e4c Linux-2.6.12-rc2 |
820 821 |
if (base < buf->page_len) { |
1e78957e0 SUNRPC: Clean up ... |
822 823 824 825 |
subbuf->page_len = min(buf->page_len - base, len); base += buf->page_base; subbuf->page_base = base & ~PAGE_CACHE_MASK; subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT]; |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 829 830 831 |
len -= subbuf->page_len; base = 0; } else { base -= buf->page_len; subbuf->page_len = 0; } |
1e78957e0 SUNRPC: Clean up ... |
832 833 834 835 836 837 838 839 840 841 842 |
if (base < buf->tail[0].iov_len) { subbuf->tail[0].iov_base = buf->tail[0].iov_base + base; subbuf->tail[0].iov_len = min_t(unsigned int, len, buf->tail[0].iov_len - base); len -= subbuf->tail[0].iov_len; base = 0; } else { subbuf->tail[0].iov_base = NULL; subbuf->tail[0].iov_len = 0; base -= buf->tail[0].iov_len; } |
1da177e4c Linux-2.6.12-rc2 |
843 844 845 846 |
if (base || len) return -1; return 0; } |
468039ee4 SUNRPC: Convert t... |
847 |
EXPORT_SYMBOL_GPL(xdr_buf_subsegment); |
1da177e4c Linux-2.6.12-rc2 |
848 |
|
4e3e43ad1 SUNRPC: Add __(re... |
849 |
static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) |
1da177e4c Linux-2.6.12-rc2 |
850 |
{ |
1e78957e0 SUNRPC: Clean up ... |
851 |
unsigned int this_len; |
1da177e4c Linux-2.6.12-rc2 |
852 |
|
4e3e43ad1 SUNRPC: Add __(re... |
853 854 |
this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); memcpy(obj, subbuf->head[0].iov_base, this_len); |
1da177e4c Linux-2.6.12-rc2 |
855 856 |
len -= this_len; obj += this_len; |
4e3e43ad1 SUNRPC: Add __(re... |
857 |
this_len = min_t(unsigned int, len, subbuf->page_len); |
1da177e4c Linux-2.6.12-rc2 |
858 |
if (this_len) |
4e3e43ad1 SUNRPC: Add __(re... |
859 |
_copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len); |
1da177e4c Linux-2.6.12-rc2 |
860 861 |
len -= this_len; obj += this_len; |
4e3e43ad1 SUNRPC: Add __(re... |
862 863 |
this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); memcpy(obj, subbuf->tail[0].iov_base, this_len); |
1da177e4c Linux-2.6.12-rc2 |
864 |
} |
bd8100e7e [PATCH] RPC: Enco... |
865 |
/* obj is assumed to point to allocated memory of size at least len: */ |
4e3e43ad1 SUNRPC: Add __(re... |
866 |
int read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) |
bd8100e7e [PATCH] RPC: Enco... |
867 868 |
{ struct xdr_buf subbuf; |
bd8100e7e [PATCH] RPC: Enco... |
869 870 871 |
int status; status = xdr_buf_subsegment(buf, &subbuf, base, len); |
4e3e43ad1 SUNRPC: Add __(re... |
872 873 874 875 876 |
if (status != 0) return status; __read_bytes_from_xdr_buf(&subbuf, obj, len); return 0; } |
468039ee4 SUNRPC: Convert t... |
877 |
EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf); |
4e3e43ad1 SUNRPC: Add __(re... |
878 879 880 881 882 883 884 |
static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) { unsigned int this_len; this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); memcpy(subbuf->head[0].iov_base, obj, this_len); |
bd8100e7e [PATCH] RPC: Enco... |
885 886 |
len -= this_len; obj += this_len; |
4e3e43ad1 SUNRPC: Add __(re... |
887 |
this_len = min_t(unsigned int, len, subbuf->page_len); |
bd8100e7e [PATCH] RPC: Enco... |
888 |
if (this_len) |
4e3e43ad1 SUNRPC: Add __(re... |
889 |
_copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len); |
bd8100e7e [PATCH] RPC: Enco... |
890 891 |
len -= this_len; obj += this_len; |
4e3e43ad1 SUNRPC: Add __(re... |
892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 |
this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); memcpy(subbuf->tail[0].iov_base, obj, this_len); } /* obj is assumed to point to allocated memory of size at least len: */ int write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) { struct xdr_buf subbuf; int status; status = xdr_buf_subsegment(buf, &subbuf, base, len); if (status != 0) return status; __write_bytes_to_xdr_buf(&subbuf, obj, len); return 0; |
bd8100e7e [PATCH] RPC: Enco... |
907 |
} |
c43abaeda xdr: Add an expor... |
908 |
EXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf); |
bd8100e7e [PATCH] RPC: Enco... |
909 910 |
int |
1e78957e0 SUNRPC: Clean up ... |
911 |
xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj) |
1da177e4c Linux-2.6.12-rc2 |
912 |
{ |
d8ed029d6 [SUNRPC]: trivial... |
913 |
__be32 raw; |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 917 918 |
int status; status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); if (status) return status; |
98866b5ab sunrpc: ntoh -> b... |
919 |
*obj = be32_to_cpu(raw); |
1da177e4c Linux-2.6.12-rc2 |
920 921 |
return 0; } |
468039ee4 SUNRPC: Convert t... |
922 |
EXPORT_SYMBOL_GPL(xdr_decode_word); |
1da177e4c Linux-2.6.12-rc2 |
923 |
|
bd8100e7e [PATCH] RPC: Enco... |
924 |
int |
1e78957e0 SUNRPC: Clean up ... |
925 |
xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj) |
bd8100e7e [PATCH] RPC: Enco... |
926 |
{ |
9f162d2a8 sunrpc: hton -> c... |
927 |
__be32 raw = cpu_to_be32(obj); |
bd8100e7e [PATCH] RPC: Enco... |
928 929 930 |
return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj)); } |
468039ee4 SUNRPC: Convert t... |
931 |
EXPORT_SYMBOL_GPL(xdr_encode_word); |
bd8100e7e [PATCH] RPC: Enco... |
932 |
|
1da177e4c Linux-2.6.12-rc2 |
933 934 935 936 |
/* If the netobj starting offset bytes from the start of xdr_buf is contained * entirely in the head or the tail, set object to point to it; otherwise * try to find space for it at the end of the tail, copy it there, and * set obj to point to it. */ |
bee57c99c SUNRPC: Ensure xd... |
937 |
int xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset) |
1da177e4c Linux-2.6.12-rc2 |
938 |
{ |
bee57c99c SUNRPC: Ensure xd... |
939 |
struct xdr_buf subbuf; |
1da177e4c Linux-2.6.12-rc2 |
940 |
|
bd8100e7e [PATCH] RPC: Enco... |
941 |
if (xdr_decode_word(buf, offset, &obj->len)) |
bee57c99c SUNRPC: Ensure xd... |
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 |
return -EFAULT; if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len)) return -EFAULT; /* Is the obj contained entirely in the head? */ obj->data = subbuf.head[0].iov_base; if (subbuf.head[0].iov_len == obj->len) return 0; /* ..or is the obj contained entirely in the tail? */ obj->data = subbuf.tail[0].iov_base; if (subbuf.tail[0].iov_len == obj->len) return 0; /* use end of tail as storage for obj: * (We don't copy to the beginning because then we'd have * to worry about doing a potentially overlapping copy. * This assumes the object is at most half the length of the * tail.) */ if (obj->len > buf->buflen - buf->len) return -ENOMEM; if (buf->tail[0].iov_len != 0) obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len; else obj->data = buf->head[0].iov_base + buf->head[0].iov_len; __read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len); |
1da177e4c Linux-2.6.12-rc2 |
967 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
968 |
} |
468039ee4 SUNRPC: Convert t... |
969 |
EXPORT_SYMBOL_GPL(xdr_buf_read_netobj); |
bd8100e7e [PATCH] RPC: Enco... |
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 |
/* Returns 0 on success, or else a negative error code. */ static int xdr_xcode_array2(struct xdr_buf *buf, unsigned int base, struct xdr_array2_desc *desc, int encode) { char *elem = NULL, *c; unsigned int copied = 0, todo, avail_here; struct page **ppages = NULL; int err; if (encode) { if (xdr_encode_word(buf, base, desc->array_len) != 0) return -EINVAL; } else { if (xdr_decode_word(buf, base, &desc->array_len) != 0 || |
58fcb8df0 [PATCH] NFS: Ensu... |
986 |
desc->array_len > desc->array_maxlen || |
bd8100e7e [PATCH] RPC: Enco... |
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 |
(unsigned long) base + 4 + desc->array_len * desc->elem_size > buf->len) return -EINVAL; } base += 4; if (!desc->xcode) return 0; todo = desc->array_len * desc->elem_size; /* process head */ if (todo && base < buf->head->iov_len) { c = buf->head->iov_base + base; avail_here = min_t(unsigned int, todo, buf->head->iov_len - base); todo -= avail_here; while (avail_here >= desc->elem_size) { err = desc->xcode(desc, c); if (err) goto out; c += desc->elem_size; avail_here -= desc->elem_size; } if (avail_here) { if (!elem) { elem = kmalloc(desc->elem_size, GFP_KERNEL); err = -ENOMEM; if (!elem) goto out; } if (encode) { err = desc->xcode(desc, elem); if (err) goto out; memcpy(c, elem, avail_here); } else memcpy(elem, c, avail_here); copied = avail_here; } base = buf->head->iov_len; /* align to start of pages */ } /* process pages array */ base -= buf->head->iov_len; if (todo && base < buf->page_len) { unsigned int avail_page; avail_here = min(todo, buf->page_len - base); todo -= avail_here; base += buf->page_base; ppages = buf->pages + (base >> PAGE_CACHE_SHIFT); base &= ~PAGE_CACHE_MASK; avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base, avail_here); c = kmap(*ppages) + base; while (avail_here) { avail_here -= avail_page; if (copied || avail_page < desc->elem_size) { unsigned int l = min(avail_page, desc->elem_size - copied); if (!elem) { elem = kmalloc(desc->elem_size, GFP_KERNEL); err = -ENOMEM; if (!elem) goto out; } if (encode) { if (!copied) { err = desc->xcode(desc, elem); if (err) goto out; } memcpy(c, elem + copied, l); copied += l; if (copied == desc->elem_size) copied = 0; } else { memcpy(elem + copied, c, l); copied += l; if (copied == desc->elem_size) { err = desc->xcode(desc, elem); if (err) goto out; copied = 0; } } avail_page -= l; c += l; } while (avail_page >= desc->elem_size) { err = desc->xcode(desc, c); if (err) goto out; c += desc->elem_size; avail_page -= desc->elem_size; } if (avail_page) { unsigned int l = min(avail_page, desc->elem_size - copied); if (!elem) { elem = kmalloc(desc->elem_size, GFP_KERNEL); err = -ENOMEM; if (!elem) goto out; } if (encode) { if (!copied) { err = desc->xcode(desc, elem); if (err) goto out; } memcpy(c, elem + copied, l); copied += l; if (copied == desc->elem_size) copied = 0; } else { memcpy(elem + copied, c, l); copied += l; if (copied == desc->elem_size) { err = desc->xcode(desc, elem); if (err) goto out; copied = 0; } } } if (avail_here) { kunmap(*ppages); ppages++; c = kmap(*ppages); } avail_page = min(avail_here, (unsigned int) PAGE_CACHE_SIZE); } base = buf->page_len; /* align to start of tail */ } /* process tail */ base -= buf->page_len; if (todo) { c = buf->tail->iov_base + base; if (copied) { unsigned int l = desc->elem_size - copied; if (encode) memcpy(c, elem + copied, l); else { memcpy(elem + copied, c, l); err = desc->xcode(desc, elem); if (err) goto out; } todo -= l; c += l; } while (todo) { err = desc->xcode(desc, c); if (err) goto out; c += desc->elem_size; todo -= desc->elem_size; } } err = 0; out: |
a51482bde [NET]: kfree cleanup |
1160 |
kfree(elem); |
bd8100e7e [PATCH] RPC: Enco... |
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 |
if (ppages) kunmap(*ppages); return err; } int xdr_decode_array2(struct xdr_buf *buf, unsigned int base, struct xdr_array2_desc *desc) { if (base >= buf->len) return -EINVAL; return xdr_xcode_array2(buf, base, desc, 0); } |
468039ee4 SUNRPC: Convert t... |
1175 |
EXPORT_SYMBOL_GPL(xdr_decode_array2); |
bd8100e7e [PATCH] RPC: Enco... |
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 |
int xdr_encode_array2(struct xdr_buf *buf, unsigned int base, struct xdr_array2_desc *desc) { if ((unsigned long) base + 4 + desc->array_len * desc->elem_size > buf->head->iov_len + buf->page_len + buf->tail->iov_len) return -EINVAL; return xdr_xcode_array2(buf, base, desc, 1); } |
468039ee4 SUNRPC: Convert t... |
1187 |
EXPORT_SYMBOL_GPL(xdr_encode_array2); |
37a4e6cb0 rpc: move process... |
1188 1189 1190 |
int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, |
cca5172a7 [NET] SUNRPC: Fix... |
1191 |
int (*actor)(struct scatterlist *, void *), void *data) |
37a4e6cb0 rpc: move process... |
1192 1193 1194 1195 |
{ int i, ret = 0; unsigned page_len, thislen, page_offset; struct scatterlist sg[1]; |
68e3f5dd4 [CRYPTO] users: F... |
1196 |
sg_init_table(sg, 1); |
37a4e6cb0 rpc: move process... |
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 |
if (offset >= buf->head[0].iov_len) { offset -= buf->head[0].iov_len; } else { thislen = buf->head[0].iov_len - offset; if (thislen > len) thislen = len; sg_set_buf(sg, buf->head[0].iov_base + offset, thislen); ret = actor(sg, data); if (ret) goto out; offset = 0; len -= thislen; } if (len == 0) goto out; if (offset >= buf->page_len) { offset -= buf->page_len; } else { page_len = buf->page_len - offset; if (page_len > len) page_len = len; len -= page_len; page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; thislen = PAGE_CACHE_SIZE - page_offset; do { if (thislen > page_len) thislen = page_len; |
642f14903 SG: Change sg_set... |
1226 |
sg_set_page(sg, buf->pages[i], thislen, page_offset); |
37a4e6cb0 rpc: move process... |
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 |
ret = actor(sg, data); if (ret) goto out; page_len -= thislen; i++; page_offset = 0; thislen = PAGE_CACHE_SIZE; } while (page_len != 0); offset = 0; } if (len == 0) goto out; if (offset < buf->tail[0].iov_len) { thislen = buf->tail[0].iov_len - offset; if (thislen > len) thislen = len; sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen); ret = actor(sg, data); len -= thislen; } if (len != 0) ret = -EINVAL; out: return ret; } |
468039ee4 SUNRPC: Convert t... |
1252 |
EXPORT_SYMBOL_GPL(xdr_process_buf); |
37a4e6cb0 rpc: move process... |
1253 |