1/* 2 * linux/fs/isofs/rock.c 3 * 4 * (C) 1992, 1993 Eric Youngdale 5 * 6 * Rock Ridge Extensions to iso9660 7 */ 8 9#include <linux/slab.h> 10#include <linux/pagemap.h> 11 12#include "isofs.h" 13#include "rock.h" 14 15/* 16 * These functions are designed to read the system areas of a directory record 17 * and extract relevant information. There are different functions provided 18 * depending upon what information we need at the time. One function fills 19 * out an inode structure, a second one extracts a filename, a third one 20 * returns a symbolic link name, and a fourth one returns the extent number 21 * for the file. 22 */ 23 24#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */ 25 26struct rock_state { 27 void *buffer; 28 unsigned char *chr; 29 int len; 30 int cont_size; 31 int cont_extent; 32 int cont_offset; 33 int cont_loops; 34 struct inode *inode; 35}; 36 37/* 38 * This is a way of ensuring that we have something in the system 39 * use fields that is compatible with Rock Ridge. Return zero on success. 40 */ 41 42static int check_sp(struct rock_ridge *rr, struct inode *inode) 43{ 44 if (rr->u.SP.magic[0] != 0xbe) 45 return -1; 46 if (rr->u.SP.magic[1] != 0xef) 47 return -1; 48 ISOFS_SB(inode->i_sb)->s_rock_offset = rr->u.SP.skip; 49 return 0; 50} 51 52static void setup_rock_ridge(struct iso_directory_record *de, 53 struct inode *inode, struct rock_state *rs) 54{ 55 rs->len = sizeof(struct iso_directory_record) + de->name_len[0]; 56 if (rs->len & 1) 57 (rs->len)++; 58 rs->chr = (unsigned char *)de + rs->len; 59 rs->len = *((unsigned char *)de) - rs->len; 60 if (rs->len < 0) 61 rs->len = 0; 62 63 if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) { 64 rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset; 65 rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset; 66 if (rs->len < 0) 67 rs->len = 0; 68 } 69} 70 71static void init_rock_state(struct rock_state *rs, struct inode *inode) 72{ 73 memset(rs, 0, sizeof(*rs)); 74 rs->inode = inode; 75} 76 77/* Maximum number of Rock Ridge continuation entries */ 78#define RR_MAX_CE_ENTRIES 32 79 80/* 81 * Returns 0 if the caller should continue scanning, 1 if the scan must end 82 * and -ve on error. 83 */ 84static int rock_continue(struct rock_state *rs) 85{ 86 int ret = 1; 87 int blocksize = 1 << rs->inode->i_blkbits; 88 const int min_de_size = offsetof(struct rock_ridge, u); 89 90 kfree(rs->buffer); 91 rs->buffer = NULL; 92 93 if ((unsigned)rs->cont_offset > blocksize - min_de_size || 94 (unsigned)rs->cont_size > blocksize || 95 (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) { 96 printk(KERN_NOTICE "rock: corrupted directory entry. " 97 "extent=%d, offset=%d, size=%d\n", 98 rs->cont_extent, rs->cont_offset, rs->cont_size); 99 ret = -EIO; 100 goto out; 101 } 102 103 if (rs->cont_extent) { 104 struct buffer_head *bh; 105 106 rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL); 107 if (!rs->buffer) { 108 ret = -ENOMEM; 109 goto out; 110 } 111 ret = -EIO; 112 if (++rs->cont_loops >= RR_MAX_CE_ENTRIES) 113 goto out; 114 bh = sb_bread(rs->inode->i_sb, rs->cont_extent); 115 if (bh) { 116 memcpy(rs->buffer, bh->b_data + rs->cont_offset, 117 rs->cont_size); 118 put_bh(bh); 119 rs->chr = rs->buffer; 120 rs->len = rs->cont_size; 121 rs->cont_extent = 0; 122 rs->cont_size = 0; 123 rs->cont_offset = 0; 124 return 0; 125 } 126 printk("Unable to read rock-ridge attributes\n"); 127 } 128out: 129 kfree(rs->buffer); 130 rs->buffer = NULL; 131 return ret; 132} 133 134/* 135 * We think there's a record of type `sig' at rs->chr. Parse the signature 136 * and make sure that there's really room for a record of that type. 137 */ 138static int rock_check_overflow(struct rock_state *rs, int sig) 139{ 140 int len; 141 142 switch (sig) { 143 case SIG('S', 'P'): 144 len = sizeof(struct SU_SP_s); 145 break; 146 case SIG('C', 'E'): 147 len = sizeof(struct SU_CE_s); 148 break; 149 case SIG('E', 'R'): 150 len = sizeof(struct SU_ER_s); 151 break; 152 case SIG('R', 'R'): 153 len = sizeof(struct RR_RR_s); 154 break; 155 case SIG('P', 'X'): 156 len = sizeof(struct RR_PX_s); 157 break; 158 case SIG('P', 'N'): 159 len = sizeof(struct RR_PN_s); 160 break; 161 case SIG('S', 'L'): 162 len = sizeof(struct RR_SL_s); 163 break; 164 case SIG('N', 'M'): 165 len = sizeof(struct RR_NM_s); 166 break; 167 case SIG('C', 'L'): 168 len = sizeof(struct RR_CL_s); 169 break; 170 case SIG('P', 'L'): 171 len = sizeof(struct RR_PL_s); 172 break; 173 case SIG('T', 'F'): 174 len = sizeof(struct RR_TF_s); 175 break; 176 case SIG('Z', 'F'): 177 len = sizeof(struct RR_ZF_s); 178 break; 179 default: 180 len = 0; 181 break; 182 } 183 len += offsetof(struct rock_ridge, u); 184 if (len > rs->len) { 185 printk(KERN_NOTICE "rock: directory entry would overflow " 186 "storage\n"); 187 printk(KERN_NOTICE "rock: sig=0x%02x, size=%d, remaining=%d\n", 188 sig, len, rs->len); 189 return -EIO; 190 } 191 return 0; 192} 193 194/* 195 * return length of name field; 0: not found, -1: to be ignored 196 */ 197int get_rock_ridge_filename(struct iso_directory_record *de, 198 char *retname, struct inode *inode) 199{ 200 struct rock_state rs; 201 struct rock_ridge *rr; 202 int sig; 203 int retnamlen = 0; 204 int truncate = 0; 205 int ret = 0; 206 char *p; 207 int len; 208 209 if (!ISOFS_SB(inode->i_sb)->s_rock) 210 return 0; 211 *retname = 0; 212 213 init_rock_state(&rs, inode); 214 setup_rock_ridge(de, inode, &rs); 215repeat: 216 217 while (rs.len > 2) { /* There may be one byte for padding somewhere */ 218 rr = (struct rock_ridge *)rs.chr; 219 /* 220 * Ignore rock ridge info if rr->len is out of range, but 221 * don't return -EIO because that would make the file 222 * invisible. 223 */ 224 if (rr->len < 3) 225 goto out; /* Something got screwed up here */ 226 sig = isonum_721(rs.chr); 227 if (rock_check_overflow(&rs, sig)) 228 goto eio; 229 rs.chr += rr->len; 230 rs.len -= rr->len; 231 /* 232 * As above, just ignore the rock ridge info if rr->len 233 * is bogus. 234 */ 235 if (rs.len < 0) 236 goto out; /* Something got screwed up here */ 237 238 switch (sig) { 239 case SIG('R', 'R'): 240 if ((rr->u.RR.flags[0] & RR_NM) == 0) 241 goto out; 242 break; 243 case SIG('S', 'P'): 244 if (check_sp(rr, inode)) 245 goto out; 246 break; 247 case SIG('C', 'E'): 248 rs.cont_extent = isonum_733(rr->u.CE.extent); 249 rs.cont_offset = isonum_733(rr->u.CE.offset); 250 rs.cont_size = isonum_733(rr->u.CE.size); 251 break; 252 case SIG('N', 'M'): 253 if (truncate) 254 break; 255 if (rr->len < 5) 256 break; 257 /* 258 * If the flags are 2 or 4, this indicates '.' or '..'. 259 * We don't want to do anything with this, because it 260 * screws up the code that calls us. We don't really 261 * care anyways, since we can just use the non-RR 262 * name. 263 */ 264 if (rr->u.NM.flags & 6) 265 break; 266 267 if (rr->u.NM.flags & ~1) { 268 printk("Unsupported NM flag settings (%d)\n", 269 rr->u.NM.flags); 270 break; 271 } 272 len = rr->len - 5; 273 if (retnamlen + len >= 254) { 274 truncate = 1; 275 break; 276 } 277 p = memchr(rr->u.NM.name, '\0', len); 278 if (unlikely(p)) 279 len = p - rr->u.NM.name; 280 memcpy(retname + retnamlen, rr->u.NM.name, len); 281 retnamlen += len; 282 retname[retnamlen] = '\0'; 283 break; 284 case SIG('R', 'E'): 285 kfree(rs.buffer); 286 return -1; 287 default: 288 break; 289 } 290 } 291 ret = rock_continue(&rs); 292 if (ret == 0) 293 goto repeat; 294 if (ret == 1) 295 return retnamlen; /* If 0, this file did not have a NM field */ 296out: 297 kfree(rs.buffer); 298 return ret; 299eio: 300 ret = -EIO; 301 goto out; 302} 303 304#define RR_REGARD_XA 1 305#define RR_RELOC_DE 2 306 307static int 308parse_rock_ridge_inode_internal(struct iso_directory_record *de, 309 struct inode *inode, int flags) 310{ 311 int symlink_len = 0; 312 int cnt, sig; 313 unsigned int reloc_block; 314 struct inode *reloc; 315 struct rock_ridge *rr; 316 int rootflag; 317 struct rock_state rs; 318 int ret = 0; 319 320 if (!ISOFS_SB(inode->i_sb)->s_rock) 321 return 0; 322 323 init_rock_state(&rs, inode); 324 setup_rock_ridge(de, inode, &rs); 325 if (flags & RR_REGARD_XA) { 326 rs.chr += 14; 327 rs.len -= 14; 328 if (rs.len < 0) 329 rs.len = 0; 330 } 331 332repeat: 333 while (rs.len > 2) { /* There may be one byte for padding somewhere */ 334 rr = (struct rock_ridge *)rs.chr; 335 /* 336 * Ignore rock ridge info if rr->len is out of range, but 337 * don't return -EIO because that would make the file 338 * invisible. 339 */ 340 if (rr->len < 3) 341 goto out; /* Something got screwed up here */ 342 sig = isonum_721(rs.chr); 343 if (rock_check_overflow(&rs, sig)) 344 goto eio; 345 rs.chr += rr->len; 346 rs.len -= rr->len; 347 /* 348 * As above, just ignore the rock ridge info if rr->len 349 * is bogus. 350 */ 351 if (rs.len < 0) 352 goto out; /* Something got screwed up here */ 353 354 switch (sig) { 355#ifndef CONFIG_ZISOFS /* No flag for SF or ZF */ 356 case SIG('R', 'R'): 357 if ((rr->u.RR.flags[0] & 358 (RR_PX | RR_TF | RR_SL | RR_CL)) == 0) 359 goto out; 360 break; 361#endif 362 case SIG('S', 'P'): 363 if (check_sp(rr, inode)) 364 goto out; 365 break; 366 case SIG('C', 'E'): 367 rs.cont_extent = isonum_733(rr->u.CE.extent); 368 rs.cont_offset = isonum_733(rr->u.CE.offset); 369 rs.cont_size = isonum_733(rr->u.CE.size); 370 break; 371 case SIG('E', 'R'): 372 /* Invalid length of ER tag id? */ 373 if (rr->u.ER.len_id + offsetof(struct rock_ridge, u.ER.data) > rr->len) 374 goto out; 375 ISOFS_SB(inode->i_sb)->s_rock = 1; 376 printk(KERN_DEBUG "ISO 9660 Extensions: "); 377 { 378 int p; 379 for (p = 0; p < rr->u.ER.len_id; p++) 380 printk("%c", rr->u.ER.data[p]); 381 } 382 printk("\n"); 383 break; 384 case SIG('P', 'X'): 385 inode->i_mode = isonum_733(rr->u.PX.mode); 386 set_nlink(inode, isonum_733(rr->u.PX.n_links)); 387 i_uid_write(inode, isonum_733(rr->u.PX.uid)); 388 i_gid_write(inode, isonum_733(rr->u.PX.gid)); 389 break; 390 case SIG('P', 'N'): 391 { 392 int high, low; 393 high = isonum_733(rr->u.PN.dev_high); 394 low = isonum_733(rr->u.PN.dev_low); 395 /* 396 * The Rock Ridge standard specifies that if 397 * sizeof(dev_t) <= 4, then the high field is 398 * unused, and the device number is completely 399 * stored in the low field. Some writers may 400 * ignore this subtlety, 401 * and as a result we test to see if the entire 402 * device number is 403 * stored in the low field, and use that. 404 */ 405 if ((low & ~0xff) && high == 0) { 406 inode->i_rdev = 407 MKDEV(low >> 8, low & 0xff); 408 } else { 409 inode->i_rdev = 410 MKDEV(high, low); 411 } 412 } 413 break; 414 case SIG('T', 'F'): 415 /* 416 * Some RRIP writers incorrectly place ctime in the 417 * TF_CREATE field. Try to handle this correctly for 418 * either case. 419 */ 420 /* Rock ridge never appears on a High Sierra disk */ 421 cnt = 0; 422 if (rr->u.TF.flags & TF_CREATE) { 423 inode->i_ctime.tv_sec = 424 iso_date(rr->u.TF.times[cnt++].time, 425 0); 426 inode->i_ctime.tv_nsec = 0; 427 } 428 if (rr->u.TF.flags & TF_MODIFY) { 429 inode->i_mtime.tv_sec = 430 iso_date(rr->u.TF.times[cnt++].time, 431 0); 432 inode->i_mtime.tv_nsec = 0; 433 } 434 if (rr->u.TF.flags & TF_ACCESS) { 435 inode->i_atime.tv_sec = 436 iso_date(rr->u.TF.times[cnt++].time, 437 0); 438 inode->i_atime.tv_nsec = 0; 439 } 440 if (rr->u.TF.flags & TF_ATTRIBUTES) { 441 inode->i_ctime.tv_sec = 442 iso_date(rr->u.TF.times[cnt++].time, 443 0); 444 inode->i_ctime.tv_nsec = 0; 445 } 446 break; 447 case SIG('S', 'L'): 448 { 449 int slen; 450 struct SL_component *slp; 451 struct SL_component *oldslp; 452 slen = rr->len - 5; 453 slp = &rr->u.SL.link; 454 inode->i_size = symlink_len; 455 while (slen > 1) { 456 rootflag = 0; 457 switch (slp->flags & ~1) { 458 case 0: 459 inode->i_size += 460 slp->len; 461 break; 462 case 2: 463 inode->i_size += 1; 464 break; 465 case 4: 466 inode->i_size += 2; 467 break; 468 case 8: 469 rootflag = 1; 470 inode->i_size += 1; 471 break; 472 default: 473 printk("Symlink component flag " 474 "not implemented\n"); 475 } 476 slen -= slp->len + 2; 477 oldslp = slp; 478 slp = (struct SL_component *) 479 (((char *)slp) + slp->len + 2); 480 481 if (slen < 2) { 482 if (((rr->u.SL. 483 flags & 1) != 0) 484 && 485 ((oldslp-> 486 flags & 1) == 0)) 487 inode->i_size += 488 1; 489 break; 490 } 491 492 /* 493 * If this component record isn't 494 * continued, then append a '/'. 495 */ 496 if (!rootflag 497 && (oldslp->flags & 1) == 0) 498 inode->i_size += 1; 499 } 500 } 501 symlink_len = inode->i_size; 502 break; 503 case SIG('R', 'E'): 504 printk(KERN_WARNING "Attempt to read inode for " 505 "relocated directory\n"); 506 goto out; 507 case SIG('C', 'L'): 508 if (flags & RR_RELOC_DE) { 509 printk(KERN_ERR 510 "ISOFS: Recursive directory relocation " 511 "is not supported\n"); 512 goto eio; 513 } 514 reloc_block = isonum_733(rr->u.CL.location); 515 if (reloc_block == ISOFS_I(inode)->i_iget5_block && 516 ISOFS_I(inode)->i_iget5_offset == 0) { 517 printk(KERN_ERR 518 "ISOFS: Directory relocation points to " 519 "itself\n"); 520 goto eio; 521 } 522 ISOFS_I(inode)->i_first_extent = reloc_block; 523 reloc = isofs_iget_reloc(inode->i_sb, reloc_block, 0); 524 if (IS_ERR(reloc)) { 525 ret = PTR_ERR(reloc); 526 goto out; 527 } 528 inode->i_mode = reloc->i_mode; 529 set_nlink(inode, reloc->i_nlink); 530 inode->i_uid = reloc->i_uid; 531 inode->i_gid = reloc->i_gid; 532 inode->i_rdev = reloc->i_rdev; 533 inode->i_size = reloc->i_size; 534 inode->i_blocks = reloc->i_blocks; 535 inode->i_atime = reloc->i_atime; 536 inode->i_ctime = reloc->i_ctime; 537 inode->i_mtime = reloc->i_mtime; 538 iput(reloc); 539 break; 540#ifdef CONFIG_ZISOFS 541 case SIG('Z', 'F'): { 542 int algo; 543 544 if (ISOFS_SB(inode->i_sb)->s_nocompress) 545 break; 546 algo = isonum_721(rr->u.ZF.algorithm); 547 if (algo == SIG('p', 'z')) { 548 int block_shift = 549 isonum_711(&rr->u.ZF.parms[1]); 550 if (block_shift > 17) { 551 printk(KERN_WARNING "isofs: " 552 "Can't handle ZF block " 553 "size of 2^%d\n", 554 block_shift); 555 } else { 556 /* 557 * Note: we don't change 558 * i_blocks here 559 */ 560 ISOFS_I(inode)->i_file_format = 561 isofs_file_compressed; 562 /* 563 * Parameters to compression 564 * algorithm (header size, 565 * block size) 566 */ 567 ISOFS_I(inode)->i_format_parm[0] = 568 isonum_711(&rr->u.ZF.parms[0]); 569 ISOFS_I(inode)->i_format_parm[1] = 570 isonum_711(&rr->u.ZF.parms[1]); 571 inode->i_size = 572 isonum_733(rr->u.ZF. 573 real_size); 574 } 575 } else { 576 printk(KERN_WARNING 577 "isofs: Unknown ZF compression " 578 "algorithm: %c%c\n", 579 rr->u.ZF.algorithm[0], 580 rr->u.ZF.algorithm[1]); 581 } 582 break; 583 } 584#endif 585 default: 586 break; 587 } 588 } 589 ret = rock_continue(&rs); 590 if (ret == 0) 591 goto repeat; 592 if (ret == 1) 593 ret = 0; 594out: 595 kfree(rs.buffer); 596 return ret; 597eio: 598 ret = -EIO; 599 goto out; 600} 601 602static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit) 603{ 604 int slen; 605 int rootflag; 606 struct SL_component *oldslp; 607 struct SL_component *slp; 608 slen = rr->len - 5; 609 slp = &rr->u.SL.link; 610 while (slen > 1) { 611 rootflag = 0; 612 switch (slp->flags & ~1) { 613 case 0: 614 if (slp->len > plimit - rpnt) 615 return NULL; 616 memcpy(rpnt, slp->text, slp->len); 617 rpnt += slp->len; 618 break; 619 case 2: 620 if (rpnt >= plimit) 621 return NULL; 622 *rpnt++ = '.'; 623 break; 624 case 4: 625 if (2 > plimit - rpnt) 626 return NULL; 627 *rpnt++ = '.'; 628 *rpnt++ = '.'; 629 break; 630 case 8: 631 if (rpnt >= plimit) 632 return NULL; 633 rootflag = 1; 634 *rpnt++ = '/'; 635 break; 636 default: 637 printk("Symlink component flag not implemented (%d)\n", 638 slp->flags); 639 } 640 slen -= slp->len + 2; 641 oldslp = slp; 642 slp = (struct SL_component *)((char *)slp + slp->len + 2); 643 644 if (slen < 2) { 645 /* 646 * If there is another SL record, and this component 647 * record isn't continued, then add a slash. 648 */ 649 if ((!rootflag) && (rr->u.SL.flags & 1) && 650 !(oldslp->flags & 1)) { 651 if (rpnt >= plimit) 652 return NULL; 653 *rpnt++ = '/'; 654 } 655 break; 656 } 657 658 /* 659 * If this component record isn't continued, then append a '/'. 660 */ 661 if (!rootflag && !(oldslp->flags & 1)) { 662 if (rpnt >= plimit) 663 return NULL; 664 *rpnt++ = '/'; 665 } 666 } 667 return rpnt; 668} 669 670int parse_rock_ridge_inode(struct iso_directory_record *de, struct inode *inode, 671 int relocated) 672{ 673 int flags = relocated ? RR_RELOC_DE : 0; 674 int result = parse_rock_ridge_inode_internal(de, inode, flags); 675 676 /* 677 * if rockridge flag was reset and we didn't look for attributes 678 * behind eventual XA attributes, have a look there 679 */ 680 if ((ISOFS_SB(inode->i_sb)->s_rock_offset == -1) 681 && (ISOFS_SB(inode->i_sb)->s_rock == 2)) { 682 result = parse_rock_ridge_inode_internal(de, inode, 683 flags | RR_REGARD_XA); 684 } 685 return result; 686} 687 688/* 689 * readpage() for symlinks: reads symlink contents into the page and either 690 * makes it uptodate and returns 0 or returns error (-EIO) 691 */ 692static int rock_ridge_symlink_readpage(struct file *file, struct page *page) 693{ 694 struct inode *inode = page->mapping->host; 695 struct iso_inode_info *ei = ISOFS_I(inode); 696 struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb); 697 char *link = kmap(page); 698 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 699 struct buffer_head *bh; 700 char *rpnt = link; 701 unsigned char *pnt; 702 struct iso_directory_record *raw_de; 703 unsigned long block, offset; 704 int sig; 705 struct rock_ridge *rr; 706 struct rock_state rs; 707 int ret; 708 709 if (!sbi->s_rock) 710 goto error; 711 712 init_rock_state(&rs, inode); 713 block = ei->i_iget5_block; 714 bh = sb_bread(inode->i_sb, block); 715 if (!bh) 716 goto out_noread; 717 718 offset = ei->i_iget5_offset; 719 pnt = (unsigned char *)bh->b_data + offset; 720 721 raw_de = (struct iso_directory_record *)pnt; 722 723 /* 724 * If we go past the end of the buffer, there is some sort of error. 725 */ 726 if (offset + *pnt > bufsize) 727 goto out_bad_span; 728 729 /* 730 * Now test for possible Rock Ridge extensions which will override 731 * some of these numbers in the inode structure. 732 */ 733 734 setup_rock_ridge(raw_de, inode, &rs); 735 736repeat: 737 while (rs.len > 2) { /* There may be one byte for padding somewhere */ 738 rr = (struct rock_ridge *)rs.chr; 739 if (rr->len < 3) 740 goto out; /* Something got screwed up here */ 741 sig = isonum_721(rs.chr); 742 if (rock_check_overflow(&rs, sig)) 743 goto out; 744 rs.chr += rr->len; 745 rs.len -= rr->len; 746 if (rs.len < 0) 747 goto out; /* corrupted isofs */ 748 749 switch (sig) { 750 case SIG('R', 'R'): 751 if ((rr->u.RR.flags[0] & RR_SL) == 0) 752 goto out; 753 break; 754 case SIG('S', 'P'): 755 if (check_sp(rr, inode)) 756 goto out; 757 break; 758 case SIG('S', 'L'): 759 rpnt = get_symlink_chunk(rpnt, rr, 760 link + (PAGE_SIZE - 1)); 761 if (rpnt == NULL) 762 goto out; 763 break; 764 case SIG('C', 'E'): 765 /* This tells is if there is a continuation record */ 766 rs.cont_extent = isonum_733(rr->u.CE.extent); 767 rs.cont_offset = isonum_733(rr->u.CE.offset); 768 rs.cont_size = isonum_733(rr->u.CE.size); 769 default: 770 break; 771 } 772 } 773 ret = rock_continue(&rs); 774 if (ret == 0) 775 goto repeat; 776 if (ret < 0) 777 goto fail; 778 779 if (rpnt == link) 780 goto fail; 781 brelse(bh); 782 *rpnt = '\0'; 783 SetPageUptodate(page); 784 kunmap(page); 785 unlock_page(page); 786 return 0; 787 788 /* error exit from macro */ 789out: 790 kfree(rs.buffer); 791 goto fail; 792out_noread: 793 printk("unable to read i-node block"); 794 goto fail; 795out_bad_span: 796 printk("symlink spans iso9660 blocks\n"); 797fail: 798 brelse(bh); 799error: 800 SetPageError(page); 801 kunmap(page); 802 unlock_page(page); 803 return -EIO; 804} 805 806const struct address_space_operations isofs_symlink_aops = { 807 .readpage = rock_ridge_symlink_readpage 808}; 809