1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * inode.c 4 * 5 * PURPOSE 6 * Inode handling routines for the OSTA-UDF(tm) filesystem. 7 * 8 * COPYRIGHT 9 * (C) 1998 Dave Boynton 10 * (C) 1998-2004 Ben Fennema 11 * (C) 1999-2000 Stelias Computing Inc 12 * 13 * HISTORY 14 * 15 * 10/04/98 dgb Added rudimentary directory functions 16 * 10/07/98 Fully working udf_block_map! It works! 17 * 11/25/98 bmap altered to better support extents 18 * 12/06/98 blf partition support in udf_iget, udf_block_map 19 * and udf_read_inode 20 * 12/12/98 rewrote udf_block_map to handle next extents and descs across 21 * block boundaries (which is not actually allowed) 22 * 12/20/98 added support for strategy 4096 23 * 03/07/99 rewrote udf_block_map (again) 24 * New funcs, inode_bmap, udf_next_aext 25 * 04/19/99 Support for writing device EA's for major/minor # 26 */ 27 28 #include "udfdecl.h" 29 #include <linux/mm.h> 30 #include <linux/module.h> 31 #include <linux/pagemap.h> 32 #include <linux/writeback.h> 33 #include <linux/slab.h> 34 #include <linux/crc-itu-t.h> 35 #include <linux/mpage.h> 36 #include <linux/uio.h> 37 #include <linux/bio.h> 38 39 #include "udf_i.h" 40 #include "udf_sb.h" 41 42 #define EXTENT_MERGE_SIZE 5 43 44 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \ 45 FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \ 46 FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC) 47 48 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \ 49 FE_PERM_O_DELETE) 50 51 struct udf_map_rq; 52 53 static umode_t udf_convert_permissions(struct fileEntry *); 54 static int udf_alloc_i_data(struct inode *inode, size_t size); 55 static int inode_getblk(struct inode *inode, struct udf_map_rq *map); 56 static int udf_insert_aext(struct inode *, struct extent_position, 57 struct kernel_lb_addr, uint32_t); 58 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t, 59 struct kernel_long_ad *, int *); 60 static void udf_prealloc_extents(struct inode *, int, int, 61 struct kernel_long_ad *, int *); 62 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *); 63 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int, 64 int, struct extent_position *); 65 static int udf_get_block_wb(struct inode *inode, sector_t block, 66 struct buffer_head *bh_result, int create); 67 68 static void __udf_clear_extent_cache(struct inode *inode) 69 { 70 struct udf_inode_info *iinfo = UDF_I(inode); 71 72 if (iinfo->cached_extent.lstart != -1) { 73 brelse(iinfo->cached_extent.epos.bh); 74 iinfo->cached_extent.lstart = -1; 75 } 76 } 77 78 /* Invalidate extent cache */ 79 static void udf_clear_extent_cache(struct inode *inode) 80 { 81 struct udf_inode_info *iinfo = UDF_I(inode); 82 83 spin_lock(&iinfo->i_extent_cache_lock); 84 __udf_clear_extent_cache(inode); 85 spin_unlock(&iinfo->i_extent_cache_lock); 86 } 87 88 /* Return contents of extent cache */ 89 static int udf_read_extent_cache(struct inode *inode, loff_t bcount, 90 loff_t *lbcount, struct extent_position *pos) 91 { 92 struct udf_inode_info *iinfo = UDF_I(inode); 93 int ret = 0; 94 95 spin_lock(&iinfo->i_extent_cache_lock); 96 if ((iinfo->cached_extent.lstart <= bcount) && 97 (iinfo->cached_extent.lstart != -1)) { 98 /* Cache hit */ 99 *lbcount = iinfo->cached_extent.lstart; 100 memcpy(pos, &iinfo->cached_extent.epos, 101 sizeof(struct extent_position)); 102 if (pos->bh) 103 get_bh(pos->bh); 104 ret = 1; 105 } 106 spin_unlock(&iinfo->i_extent_cache_lock); 107 return ret; 108 } 109 110 /* Add extent to extent cache */ 111 static void udf_update_extent_cache(struct inode *inode, loff_t estart, 112 struct extent_position *pos) 113 { 114 struct udf_inode_info *iinfo = UDF_I(inode); 115 116 spin_lock(&iinfo->i_extent_cache_lock); 117 /* Invalidate previously cached extent */ 118 __udf_clear_extent_cache(inode); 119 if (pos->bh) 120 get_bh(pos->bh); 121 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos)); 122 iinfo->cached_extent.lstart = estart; 123 switch (iinfo->i_alloc_type) { 124 case ICBTAG_FLAG_AD_SHORT: 125 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad); 126 break; 127 case ICBTAG_FLAG_AD_LONG: 128 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad); 129 break; 130 } 131 spin_unlock(&iinfo->i_extent_cache_lock); 132 } 133 134 void udf_evict_inode(struct inode *inode) 135 { 136 struct udf_inode_info *iinfo = UDF_I(inode); 137 int want_delete = 0; 138 139 if (!is_bad_inode(inode)) { 140 if (!inode->i_nlink) { 141 want_delete = 1; 142 udf_setsize(inode, 0); 143 sync_inode_metadata(inode, IS_SYNC(inode)); 144 } 145 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && 146 inode->i_size != iinfo->i_lenExtents) { 147 udf_warn(inode->i_sb, 148 "Inode %llu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n", 149 inode->i_ino, inode->i_mode, 150 (unsigned long long)inode->i_size, 151 (unsigned long long)iinfo->i_lenExtents); 152 } 153 } 154 truncate_inode_pages_final(&inode->i_data); 155 if (!want_delete) 156 mmb_sync(&iinfo->i_metadata_bhs); 157 mmb_invalidate(&iinfo->i_metadata_bhs); 158 clear_inode(inode); 159 kfree(iinfo->i_data); 160 iinfo->i_data = NULL; 161 udf_clear_extent_cache(inode); 162 if (want_delete) { 163 udf_free_inode(inode); 164 } 165 } 166 167 static void udf_write_failed(struct address_space *mapping, loff_t to) 168 { 169 struct inode *inode = mapping->host; 170 struct udf_inode_info *iinfo = UDF_I(inode); 171 loff_t isize = inode->i_size; 172 173 if (to > isize) { 174 truncate_pagecache(inode, isize); 175 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 176 down_write(&iinfo->i_data_sem); 177 udf_clear_extent_cache(inode); 178 udf_truncate_extents(inode); 179 up_write(&iinfo->i_data_sem); 180 } 181 } 182 } 183 184 static int udf_handle_page_wb(struct folio *folio, 185 struct writeback_control *wbc) 186 { 187 struct inode *inode = folio->mapping->host; 188 struct udf_inode_info *iinfo = UDF_I(inode); 189 190 /* 191 * Inodes in the normal format are handled by the generic code. This 192 * check is race-free as the folio lock protects us from inode type 193 * conversion. 194 */ 195 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) 196 return 1; 197 198 memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 199 0, i_size_read(inode)); 200 folio_unlock(folio); 201 mark_inode_dirty(inode); 202 return 0; 203 } 204 205 static int udf_writepages(struct address_space *mapping, 206 struct writeback_control *wbc) 207 { 208 return __mpage_writepages(mapping, wbc, udf_get_block_wb, 209 udf_handle_page_wb); 210 } 211 212 static void udf_adinicb_read_folio(struct folio *folio) 213 { 214 struct inode *inode = folio->mapping->host; 215 struct udf_inode_info *iinfo = UDF_I(inode); 216 loff_t isize = i_size_read(inode); 217 218 folio_fill_tail(folio, 0, iinfo->i_data + iinfo->i_lenEAttr, isize); 219 folio_mark_uptodate(folio); 220 } 221 222 static int udf_read_folio(struct file *file, struct folio *folio) 223 { 224 struct udf_inode_info *iinfo = UDF_I(file_inode(file)); 225 226 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 227 udf_adinicb_read_folio(folio); 228 folio_unlock(folio); 229 return 0; 230 } 231 return mpage_read_folio(folio, udf_get_block); 232 } 233 234 static void udf_readahead(struct readahead_control *rac) 235 { 236 struct udf_inode_info *iinfo = UDF_I(rac->mapping->host); 237 238 /* 239 * No readahead needed for in-ICB files and udf_get_block() would get 240 * confused for such file anyway. 241 */ 242 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 243 return; 244 245 mpage_readahead(rac, udf_get_block); 246 } 247 248 static int udf_write_begin(const struct kiocb *iocb, 249 struct address_space *mapping, 250 loff_t pos, unsigned len, 251 struct folio **foliop, void **fsdata) 252 { 253 struct file *file = iocb->ki_filp; 254 struct udf_inode_info *iinfo = UDF_I(file_inode(file)); 255 struct folio *folio; 256 int ret; 257 258 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 259 ret = block_write_begin(mapping, pos, len, foliop, 260 udf_get_block); 261 if (unlikely(ret)) 262 udf_write_failed(mapping, pos + len); 263 return ret; 264 } 265 if (WARN_ON_ONCE(pos >= PAGE_SIZE)) 266 return -EIO; 267 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN, 268 mapping_gfp_mask(mapping)); 269 if (IS_ERR(folio)) 270 return PTR_ERR(folio); 271 *foliop = folio; 272 if (!folio_test_uptodate(folio)) 273 udf_adinicb_read_folio(folio); 274 return 0; 275 } 276 277 static int udf_write_end(const struct kiocb *iocb, 278 struct address_space *mapping, 279 loff_t pos, unsigned len, unsigned copied, 280 struct folio *folio, void *fsdata) 281 { 282 struct inode *inode = file_inode(iocb->ki_filp); 283 loff_t last_pos; 284 285 if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) 286 return generic_write_end(iocb, mapping, pos, len, copied, folio, 287 fsdata); 288 last_pos = pos + copied; 289 if (last_pos > inode->i_size) 290 i_size_write(inode, last_pos); 291 folio_mark_dirty(folio); 292 folio_unlock(folio); 293 folio_put(folio); 294 295 return copied; 296 } 297 298 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 299 { 300 struct file *file = iocb->ki_filp; 301 struct address_space *mapping = file->f_mapping; 302 struct inode *inode = mapping->host; 303 size_t count = iov_iter_count(iter); 304 ssize_t ret; 305 306 /* Fallback to buffered IO for in-ICB files */ 307 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 308 return 0; 309 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block); 310 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE)) 311 udf_write_failed(mapping, iocb->ki_pos + count); 312 return ret; 313 } 314 315 static sector_t udf_bmap(struct address_space *mapping, sector_t block) 316 { 317 struct udf_inode_info *iinfo = UDF_I(mapping->host); 318 319 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 320 return -EINVAL; 321 return generic_block_bmap(mapping, block, udf_get_block); 322 } 323 324 const struct address_space_operations udf_aops = { 325 .dirty_folio = block_dirty_folio, 326 .invalidate_folio = block_invalidate_folio, 327 .read_folio = udf_read_folio, 328 .readahead = udf_readahead, 329 .writepages = udf_writepages, 330 .write_begin = udf_write_begin, 331 .write_end = udf_write_end, 332 .direct_IO = udf_direct_IO, 333 .bmap = udf_bmap, 334 .migrate_folio = buffer_migrate_folio, 335 }; 336 337 /* 338 * Expand file stored in ICB to a normal one-block-file 339 * 340 * This function requires i_mutex held 341 */ 342 int udf_expand_file_adinicb(struct inode *inode) 343 { 344 struct folio *folio; 345 struct udf_inode_info *iinfo = UDF_I(inode); 346 int err; 347 348 WARN_ON_ONCE(!inode_is_locked(inode)); 349 if (!iinfo->i_lenAlloc) { 350 down_write(&iinfo->i_data_sem); 351 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 352 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; 353 else 354 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; 355 up_write(&iinfo->i_data_sem); 356 mark_inode_dirty(inode); 357 return 0; 358 } 359 360 folio = __filemap_get_folio(inode->i_mapping, 0, 361 FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL); 362 if (IS_ERR(folio)) 363 return PTR_ERR(folio); 364 365 if (!folio_test_uptodate(folio)) 366 udf_adinicb_read_folio(folio); 367 down_write(&iinfo->i_data_sem); 368 memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00, 369 iinfo->i_lenAlloc); 370 iinfo->i_lenAlloc = 0; 371 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 372 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; 373 else 374 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; 375 folio_mark_dirty(folio); 376 folio_unlock(folio); 377 up_write(&iinfo->i_data_sem); 378 err = filemap_fdatawrite(inode->i_mapping); 379 if (err) { 380 /* Restore everything back so that we don't lose data... */ 381 folio_lock(folio); 382 down_write(&iinfo->i_data_sem); 383 memcpy_from_folio(iinfo->i_data + iinfo->i_lenEAttr, 384 folio, 0, inode->i_size); 385 folio_unlock(folio); 386 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; 387 iinfo->i_lenAlloc = inode->i_size; 388 up_write(&iinfo->i_data_sem); 389 } 390 folio_put(folio); 391 mark_inode_dirty(inode); 392 393 return err; 394 } 395 396 #define UDF_MAP_CREATE 0x01 /* Mapping can allocate new blocks */ 397 #define UDF_MAP_NOPREALLOC 0x02 /* Do not preallocate blocks */ 398 399 #define UDF_BLK_MAPPED 0x01 /* Block was successfully mapped */ 400 #define UDF_BLK_NEW 0x02 /* Block was freshly allocated */ 401 402 struct udf_map_rq { 403 sector_t lblk; 404 udf_pblk_t pblk; 405 int iflags; /* UDF_MAP_ flags determining behavior */ 406 int oflags; /* UDF_BLK_ flags reporting results */ 407 }; 408 409 static int udf_map_block(struct inode *inode, struct udf_map_rq *map) 410 { 411 int ret; 412 struct udf_inode_info *iinfo = UDF_I(inode); 413 414 if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)) 415 return -EFSCORRUPTED; 416 417 map->oflags = 0; 418 if (!(map->iflags & UDF_MAP_CREATE)) { 419 struct kernel_lb_addr eloc; 420 uint32_t elen; 421 sector_t offset; 422 struct extent_position epos = {}; 423 int8_t etype; 424 425 down_read(&iinfo->i_data_sem); 426 ret = inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset, 427 &etype); 428 if (ret < 0) 429 goto out_read; 430 if (ret > 0 && etype == (EXT_RECORDED_ALLOCATED >> 30)) { 431 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, 432 offset); 433 map->oflags |= UDF_BLK_MAPPED; 434 ret = 0; 435 } 436 out_read: 437 up_read(&iinfo->i_data_sem); 438 brelse(epos.bh); 439 440 return ret; 441 } 442 443 down_write(&iinfo->i_data_sem); 444 /* 445 * Block beyond EOF and prealloc extents? Just discard preallocation 446 * as it is not useful and complicates things. 447 */ 448 if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents) 449 udf_discard_prealloc(inode); 450 udf_clear_extent_cache(inode); 451 ret = inode_getblk(inode, map); 452 up_write(&iinfo->i_data_sem); 453 return ret; 454 } 455 456 static int __udf_get_block(struct inode *inode, sector_t block, 457 struct buffer_head *bh_result, int flags) 458 { 459 int err; 460 struct udf_map_rq map = { 461 .lblk = block, 462 .iflags = flags, 463 }; 464 465 err = udf_map_block(inode, &map); 466 if (err < 0) 467 return err; 468 if (map.oflags & UDF_BLK_MAPPED) { 469 map_bh(bh_result, inode->i_sb, map.pblk); 470 if (map.oflags & UDF_BLK_NEW) 471 set_buffer_new(bh_result); 472 } 473 return 0; 474 } 475 476 int udf_get_block(struct inode *inode, sector_t block, 477 struct buffer_head *bh_result, int create) 478 { 479 int flags = create ? UDF_MAP_CREATE : 0; 480 481 /* 482 * We preallocate blocks only for regular files. It also makes sense 483 * for directories but there's a problem when to drop the 484 * preallocation. We might use some delayed work for that but I feel 485 * it's overengineering for a filesystem like UDF. 486 */ 487 if (!S_ISREG(inode->i_mode)) 488 flags |= UDF_MAP_NOPREALLOC; 489 return __udf_get_block(inode, block, bh_result, flags); 490 } 491 492 /* 493 * We shouldn't be allocating blocks on page writeback since we allocate them 494 * on page fault. We can spot dirty buffers without allocated blocks though 495 * when truncate expands file. These however don't have valid data so we can 496 * safely ignore them. So never allocate blocks from page writeback. 497 */ 498 static int udf_get_block_wb(struct inode *inode, sector_t block, 499 struct buffer_head *bh_result, int create) 500 { 501 return __udf_get_block(inode, block, bh_result, 0); 502 } 503 504 /* Extend the file with new blocks totaling 'new_block_bytes', 505 * return the number of extents added 506 */ 507 static int udf_do_extend_file(struct inode *inode, 508 struct extent_position *last_pos, 509 struct kernel_long_ad *last_ext, 510 loff_t new_block_bytes) 511 { 512 uint32_t add; 513 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 514 struct super_block *sb = inode->i_sb; 515 struct udf_inode_info *iinfo; 516 int err; 517 518 /* The previous extent is fake and we should not extend by anything 519 * - there's nothing to do... */ 520 if (!new_block_bytes && fake) 521 return 0; 522 523 iinfo = UDF_I(inode); 524 /* Round the last extent up to a multiple of block size */ 525 if (last_ext->extLength & (sb->s_blocksize - 1)) { 526 last_ext->extLength = 527 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) | 528 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) + 529 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); 530 iinfo->i_lenExtents = 531 (iinfo->i_lenExtents + sb->s_blocksize - 1) & 532 ~(sb->s_blocksize - 1); 533 } 534 535 add = 0; 536 /* Can we merge with the previous extent? */ 537 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == 538 EXT_NOT_RECORDED_NOT_ALLOCATED) { 539 add = (1 << 30) - sb->s_blocksize - 540 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 541 if (add > new_block_bytes) 542 add = new_block_bytes; 543 new_block_bytes -= add; 544 last_ext->extLength += add; 545 } 546 547 if (fake) { 548 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 549 last_ext->extLength, 1); 550 if (err < 0) 551 goto out_err; 552 count++; 553 } else { 554 struct kernel_lb_addr tmploc; 555 uint32_t tmplen; 556 int8_t tmptype; 557 558 udf_write_aext(inode, last_pos, &last_ext->extLocation, 559 last_ext->extLength, 1); 560 561 /* 562 * We've rewritten the last extent. If we are going to add 563 * more extents, we may need to enter possible following 564 * empty indirect extent. 565 */ 566 if (new_block_bytes) { 567 err = udf_next_aext(inode, last_pos, &tmploc, &tmplen, 568 &tmptype, 0); 569 if (err < 0) 570 goto out_err; 571 } 572 } 573 iinfo->i_lenExtents += add; 574 575 /* Managed to do everything necessary? */ 576 if (!new_block_bytes) 577 goto out; 578 579 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */ 580 last_ext->extLocation.logicalBlockNum = 0; 581 last_ext->extLocation.partitionReferenceNum = 0; 582 add = (1 << 30) - sb->s_blocksize; 583 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add; 584 585 /* Create enough extents to cover the whole hole */ 586 while (new_block_bytes > add) { 587 new_block_bytes -= add; 588 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 589 last_ext->extLength, 1); 590 if (err) 591 goto out_err; 592 iinfo->i_lenExtents += add; 593 count++; 594 } 595 if (new_block_bytes) { 596 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 597 new_block_bytes; 598 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 599 last_ext->extLength, 1); 600 if (err) 601 goto out_err; 602 iinfo->i_lenExtents += new_block_bytes; 603 count++; 604 } 605 606 out: 607 /* last_pos should point to the last written extent... */ 608 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 609 last_pos->offset -= sizeof(struct short_ad); 610 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 611 last_pos->offset -= sizeof(struct long_ad); 612 else 613 return -EIO; 614 615 return count; 616 out_err: 617 /* Remove extents we've created so far */ 618 udf_clear_extent_cache(inode); 619 udf_truncate_extents(inode); 620 return err; 621 } 622 623 /* Extend the final block of the file to final_block_len bytes */ 624 static void udf_do_extend_final_block(struct inode *inode, 625 struct extent_position *last_pos, 626 struct kernel_long_ad *last_ext, 627 uint32_t new_elen) 628 { 629 uint32_t added_bytes; 630 631 /* 632 * Extent already large enough? It may be already rounded up to block 633 * size... 634 */ 635 if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) 636 return; 637 added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 638 last_ext->extLength += added_bytes; 639 UDF_I(inode)->i_lenExtents += added_bytes; 640 641 udf_write_aext(inode, last_pos, &last_ext->extLocation, 642 last_ext->extLength, 1); 643 } 644 645 static int udf_extend_file(struct inode *inode, loff_t newsize) 646 { 647 648 struct extent_position epos; 649 struct kernel_lb_addr eloc; 650 uint32_t elen; 651 int8_t etype; 652 struct super_block *sb = inode->i_sb; 653 sector_t first_block = newsize >> sb->s_blocksize_bits, offset; 654 loff_t new_elen; 655 int adsize; 656 struct udf_inode_info *iinfo = UDF_I(inode); 657 struct kernel_long_ad extent; 658 int err = 0; 659 bool within_last_ext; 660 661 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 662 adsize = sizeof(struct short_ad); 663 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 664 adsize = sizeof(struct long_ad); 665 else 666 BUG(); 667 668 down_write(&iinfo->i_data_sem); 669 /* 670 * When creating hole in file, just don't bother with preserving 671 * preallocation. It likely won't be very useful anyway. 672 */ 673 udf_discard_prealloc(inode); 674 675 err = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset, &etype); 676 if (err < 0) 677 goto out; 678 within_last_ext = (err == 1); 679 /* We don't expect extents past EOF... */ 680 WARN_ON_ONCE(within_last_ext && 681 elen > ((loff_t)offset + 1) << inode->i_blkbits); 682 683 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) || 684 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) { 685 /* File has no extents at all or has empty last 686 * indirect extent! Create a fake extent... */ 687 extent.extLocation.logicalBlockNum = 0; 688 extent.extLocation.partitionReferenceNum = 0; 689 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 690 } else { 691 epos.offset -= adsize; 692 err = udf_next_aext(inode, &epos, &extent.extLocation, 693 &extent.extLength, &etype, 0); 694 if (err <= 0) 695 goto out; 696 extent.extLength |= etype << 30; 697 } 698 699 new_elen = ((loff_t)offset << inode->i_blkbits) | 700 (newsize & (sb->s_blocksize - 1)); 701 702 /* File has extent covering the new size (could happen when extending 703 * inside a block)? 704 */ 705 if (within_last_ext) { 706 /* Extending file within the last file block */ 707 udf_do_extend_final_block(inode, &epos, &extent, new_elen); 708 } else { 709 err = udf_do_extend_file(inode, &epos, &extent, new_elen); 710 } 711 712 if (err < 0) 713 goto out; 714 err = 0; 715 out: 716 brelse(epos.bh); 717 up_write(&iinfo->i_data_sem); 718 return err; 719 } 720 721 static int inode_getblk(struct inode *inode, struct udf_map_rq *map) 722 { 723 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE]; 724 struct extent_position prev_epos, cur_epos, next_epos; 725 int count = 0, startnum = 0, endnum = 0; 726 uint32_t elen = 0, tmpelen; 727 struct kernel_lb_addr eloc, tmpeloc; 728 int c = 1; 729 loff_t lbcount = 0, b_off = 0; 730 udf_pblk_t newblocknum; 731 sector_t offset = 0; 732 int8_t etype, tmpetype; 733 struct udf_inode_info *iinfo = UDF_I(inode); 734 udf_pblk_t goal = 0, pgoal = 0; 735 int lastblock = 0; 736 bool isBeyondEOF = false; 737 int ret = 0; 738 739 prev_epos.offset = udf_file_entry_alloc_offset(inode); 740 prev_epos.block = iinfo->i_location; 741 prev_epos.bh = NULL; 742 cur_epos = next_epos = prev_epos; 743 b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits; 744 745 /* find the extent which contains the block we are looking for. 746 alternate between laarr[0] and laarr[1] for locations of the 747 current extent, and the previous extent */ 748 do { 749 if (prev_epos.bh != cur_epos.bh) { 750 brelse(prev_epos.bh); 751 get_bh(cur_epos.bh); 752 prev_epos.bh = cur_epos.bh; 753 } 754 if (cur_epos.bh != next_epos.bh) { 755 brelse(cur_epos.bh); 756 get_bh(next_epos.bh); 757 cur_epos.bh = next_epos.bh; 758 } 759 760 lbcount += elen; 761 762 prev_epos.block = cur_epos.block; 763 cur_epos.block = next_epos.block; 764 765 prev_epos.offset = cur_epos.offset; 766 cur_epos.offset = next_epos.offset; 767 768 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 1); 769 if (ret < 0) { 770 goto out_free; 771 } else if (ret == 0) { 772 isBeyondEOF = true; 773 break; 774 } 775 776 c = !c; 777 778 laarr[c].extLength = (etype << 30) | elen; 779 laarr[c].extLocation = eloc; 780 781 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 782 pgoal = eloc.logicalBlockNum + 783 ((elen + inode->i_sb->s_blocksize - 1) >> 784 inode->i_sb->s_blocksize_bits); 785 786 count++; 787 } while (lbcount + elen <= b_off); 788 789 b_off -= lbcount; 790 offset = b_off >> inode->i_sb->s_blocksize_bits; 791 /* 792 * Move prev_epos and cur_epos into indirect extent if we are at 793 * the pointer to it 794 */ 795 ret = udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, &tmpetype, 0); 796 if (ret < 0) 797 goto out_free; 798 ret = udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, &tmpetype, 0); 799 if (ret < 0) 800 goto out_free; 801 802 /* if the extent is allocated and recorded, return the block 803 if the extent is not a multiple of the blocksize, round up */ 804 805 if (!isBeyondEOF && etype == (EXT_RECORDED_ALLOCATED >> 30)) { 806 if (elen & (inode->i_sb->s_blocksize - 1)) { 807 elen = EXT_RECORDED_ALLOCATED | 808 ((elen + inode->i_sb->s_blocksize - 1) & 809 ~(inode->i_sb->s_blocksize - 1)); 810 iinfo->i_lenExtents = 811 ALIGN(iinfo->i_lenExtents, 812 inode->i_sb->s_blocksize); 813 udf_write_aext(inode, &cur_epos, &eloc, elen, 1); 814 } 815 map->oflags = UDF_BLK_MAPPED; 816 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset); 817 ret = 0; 818 goto out_free; 819 } 820 821 /* Are we beyond EOF and preallocated extent? */ 822 if (isBeyondEOF) { 823 loff_t hole_len; 824 825 if (count) { 826 if (c) 827 laarr[0] = laarr[1]; 828 startnum = 1; 829 } else { 830 /* Create a fake extent when there's not one */ 831 memset(&laarr[0].extLocation, 0x00, 832 sizeof(struct kernel_lb_addr)); 833 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 834 /* Will udf_do_extend_file() create real extent from 835 a fake one? */ 836 startnum = (offset > 0); 837 } 838 /* Create extents for the hole between EOF and offset */ 839 hole_len = (loff_t)offset << inode->i_blkbits; 840 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len); 841 if (ret < 0) 842 goto out_free; 843 c = 0; 844 offset = 0; 845 count += ret; 846 /* 847 * Is there any real extent? - otherwise we overwrite the fake 848 * one... 849 */ 850 if (count) 851 c = !c; 852 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 853 inode->i_sb->s_blocksize; 854 memset(&laarr[c].extLocation, 0x00, 855 sizeof(struct kernel_lb_addr)); 856 count++; 857 endnum = c + 1; 858 lastblock = 1; 859 } else { 860 endnum = startnum = ((count > 2) ? 2 : count); 861 862 /* if the current extent is in position 0, 863 swap it with the previous */ 864 if (!c && count != 1) { 865 laarr[2] = laarr[0]; 866 laarr[0] = laarr[1]; 867 laarr[1] = laarr[2]; 868 c = 1; 869 } 870 871 /* if the current block is located in an extent, 872 read the next extent */ 873 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 0); 874 if (ret > 0) { 875 laarr[c + 1].extLength = (etype << 30) | elen; 876 laarr[c + 1].extLocation = eloc; 877 count++; 878 startnum++; 879 endnum++; 880 } else if (ret == 0) 881 lastblock = 1; 882 else 883 goto out_free; 884 } 885 886 /* if the current extent is not recorded but allocated, get the 887 * block in the extent corresponding to the requested block */ 888 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 889 newblocknum = laarr[c].extLocation.logicalBlockNum + offset; 890 else { /* otherwise, allocate a new block */ 891 if (iinfo->i_next_alloc_block == map->lblk) 892 goal = iinfo->i_next_alloc_goal; 893 if (!goal) 894 goal = pgoal; 895 if (!goal) 896 goal = iinfo->i_location.logicalBlockNum + 1; 897 898 newblocknum = udf_new_block(inode->i_sb, inode, 899 iinfo->i_location.partitionReferenceNum, 900 goal, &ret); 901 if (!newblocknum) 902 goto out_free; 903 if (isBeyondEOF) 904 iinfo->i_lenExtents += inode->i_sb->s_blocksize; 905 } 906 907 /* if the extent the requsted block is located in contains multiple 908 * blocks, split the extent into at most three extents. blocks prior 909 * to requested block, requested block, and blocks after requested 910 * block */ 911 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum); 912 913 if (!(map->iflags & UDF_MAP_NOPREALLOC)) 914 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); 915 916 /* merge any continuous blocks in laarr */ 917 udf_merge_extents(inode, laarr, &endnum); 918 919 /* write back the new extents, inserting new extents if the new number 920 * of extents is greater than the old number, and deleting extents if 921 * the new number of extents is less than the old number */ 922 ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos); 923 if (ret < 0) 924 goto out_free; 925 926 map->pblk = udf_get_pblock(inode->i_sb, newblocknum, 927 iinfo->i_location.partitionReferenceNum, 0); 928 if (!map->pblk) { 929 ret = -EFSCORRUPTED; 930 goto out_free; 931 } 932 map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED; 933 iinfo->i_next_alloc_block = map->lblk + 1; 934 iinfo->i_next_alloc_goal = newblocknum + 1; 935 inode_set_ctime_current(inode); 936 937 mark_inode_dirty(inode); 938 ret = 0; 939 out_free: 940 brelse(prev_epos.bh); 941 brelse(cur_epos.bh); 942 brelse(next_epos.bh); 943 return ret; 944 } 945 946 static void udf_split_extents(struct inode *inode, int *c, int offset, 947 udf_pblk_t newblocknum, 948 struct kernel_long_ad *laarr, int *endnum) 949 { 950 unsigned long blocksize = inode->i_sb->s_blocksize; 951 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 952 953 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) || 954 (laarr[*c].extLength >> 30) == 955 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 956 int curr = *c; 957 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) + 958 blocksize - 1) >> blocksize_bits; 959 int8_t etype = (laarr[curr].extLength >> 30); 960 961 if (blen == 1) 962 ; 963 else if (!offset || blen == offset + 1) { 964 laarr[curr + 2] = laarr[curr + 1]; 965 laarr[curr + 1] = laarr[curr]; 966 } else { 967 laarr[curr + 3] = laarr[curr + 1]; 968 laarr[curr + 2] = laarr[curr + 1] = laarr[curr]; 969 } 970 971 if (offset) { 972 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 973 udf_free_blocks(inode->i_sb, inode, 974 &laarr[curr].extLocation, 975 0, offset); 976 laarr[curr].extLength = 977 EXT_NOT_RECORDED_NOT_ALLOCATED | 978 (offset << blocksize_bits); 979 laarr[curr].extLocation.logicalBlockNum = 0; 980 laarr[curr].extLocation. 981 partitionReferenceNum = 0; 982 } else 983 laarr[curr].extLength = (etype << 30) | 984 (offset << blocksize_bits); 985 curr++; 986 (*c)++; 987 (*endnum)++; 988 } 989 990 laarr[curr].extLocation.logicalBlockNum = newblocknum; 991 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 992 laarr[curr].extLocation.partitionReferenceNum = 993 UDF_I(inode)->i_location.partitionReferenceNum; 994 laarr[curr].extLength = EXT_RECORDED_ALLOCATED | 995 blocksize; 996 curr++; 997 998 if (blen != offset + 1) { 999 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 1000 laarr[curr].extLocation.logicalBlockNum += 1001 offset + 1; 1002 laarr[curr].extLength = (etype << 30) | 1003 ((blen - (offset + 1)) << blocksize_bits); 1004 curr++; 1005 (*endnum)++; 1006 } 1007 } 1008 } 1009 1010 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock, 1011 struct kernel_long_ad *laarr, 1012 int *endnum) 1013 { 1014 int start, length = 0, currlength = 0, i; 1015 1016 if (*endnum >= (c + 1)) { 1017 if (!lastblock) 1018 return; 1019 else 1020 start = c; 1021 } else { 1022 if ((laarr[c + 1].extLength >> 30) == 1023 (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 1024 start = c + 1; 1025 length = currlength = 1026 (((laarr[c + 1].extLength & 1027 UDF_EXTENT_LENGTH_MASK) + 1028 inode->i_sb->s_blocksize - 1) >> 1029 inode->i_sb->s_blocksize_bits); 1030 } else 1031 start = c; 1032 } 1033 1034 for (i = start + 1; i <= *endnum; i++) { 1035 if (i == *endnum) { 1036 if (lastblock) 1037 length += UDF_DEFAULT_PREALLOC_BLOCKS; 1038 } else if ((laarr[i].extLength >> 30) == 1039 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 1040 length += (((laarr[i].extLength & 1041 UDF_EXTENT_LENGTH_MASK) + 1042 inode->i_sb->s_blocksize - 1) >> 1043 inode->i_sb->s_blocksize_bits); 1044 } else 1045 break; 1046 } 1047 1048 if (length) { 1049 int next = laarr[start].extLocation.logicalBlockNum + 1050 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) + 1051 inode->i_sb->s_blocksize - 1) >> 1052 inode->i_sb->s_blocksize_bits); 1053 int numalloc = udf_prealloc_blocks(inode->i_sb, inode, 1054 laarr[start].extLocation.partitionReferenceNum, 1055 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? 1056 length : UDF_DEFAULT_PREALLOC_BLOCKS) - 1057 currlength); 1058 if (numalloc) { 1059 if (start == (c + 1)) 1060 laarr[start].extLength += 1061 (numalloc << 1062 inode->i_sb->s_blocksize_bits); 1063 else { 1064 memmove(&laarr[c + 2], &laarr[c + 1], 1065 sizeof(struct long_ad) * (*endnum - (c + 1))); 1066 (*endnum)++; 1067 laarr[c + 1].extLocation.logicalBlockNum = next; 1068 laarr[c + 1].extLocation.partitionReferenceNum = 1069 laarr[c].extLocation. 1070 partitionReferenceNum; 1071 laarr[c + 1].extLength = 1072 EXT_NOT_RECORDED_ALLOCATED | 1073 (numalloc << 1074 inode->i_sb->s_blocksize_bits); 1075 start = c + 1; 1076 } 1077 1078 for (i = start + 1; numalloc && i < *endnum; i++) { 1079 int elen = ((laarr[i].extLength & 1080 UDF_EXTENT_LENGTH_MASK) + 1081 inode->i_sb->s_blocksize - 1) >> 1082 inode->i_sb->s_blocksize_bits; 1083 1084 if (elen > numalloc) { 1085 laarr[i].extLength -= 1086 (numalloc << 1087 inode->i_sb->s_blocksize_bits); 1088 numalloc = 0; 1089 } else { 1090 numalloc -= elen; 1091 if (*endnum > (i + 1)) 1092 memmove(&laarr[i], 1093 &laarr[i + 1], 1094 sizeof(struct long_ad) * 1095 (*endnum - (i + 1))); 1096 i--; 1097 (*endnum)--; 1098 } 1099 } 1100 UDF_I(inode)->i_lenExtents += 1101 numalloc << inode->i_sb->s_blocksize_bits; 1102 } 1103 } 1104 } 1105 1106 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr, 1107 int *endnum) 1108 { 1109 int i; 1110 unsigned long blocksize = inode->i_sb->s_blocksize; 1111 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 1112 1113 for (i = 0; i < (*endnum - 1); i++) { 1114 struct kernel_long_ad *li /*l[i]*/ = &laarr[i]; 1115 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1]; 1116 1117 if (((li->extLength >> 30) == (lip1->extLength >> 30)) && 1118 (((li->extLength >> 30) == 1119 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) || 1120 ((lip1->extLocation.logicalBlockNum - 1121 li->extLocation.logicalBlockNum) == 1122 (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 1123 blocksize - 1) >> blocksize_bits)))) { 1124 1125 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 1126 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + 1127 blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) { 1128 li->extLength = lip1->extLength + 1129 (((li->extLength & 1130 UDF_EXTENT_LENGTH_MASK) + 1131 blocksize - 1) & ~(blocksize - 1)); 1132 if (*endnum > (i + 2)) 1133 memmove(&laarr[i + 1], &laarr[i + 2], 1134 sizeof(struct long_ad) * 1135 (*endnum - (i + 2))); 1136 i--; 1137 (*endnum)--; 1138 } 1139 } else if (((li->extLength >> 30) == 1140 (EXT_NOT_RECORDED_ALLOCATED >> 30)) && 1141 ((lip1->extLength >> 30) == 1142 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) { 1143 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0, 1144 ((li->extLength & 1145 UDF_EXTENT_LENGTH_MASK) + 1146 blocksize - 1) >> blocksize_bits); 1147 li->extLocation.logicalBlockNum = 0; 1148 li->extLocation.partitionReferenceNum = 0; 1149 1150 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 1151 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + 1152 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { 1153 lip1->extLength = (lip1->extLength - 1154 (li->extLength & 1155 UDF_EXTENT_LENGTH_MASK) + 1156 UDF_EXTENT_LENGTH_MASK) & 1157 ~(blocksize - 1); 1158 li->extLength = (li->extLength & 1159 UDF_EXTENT_FLAG_MASK) + 1160 (UDF_EXTENT_LENGTH_MASK + 1) - 1161 blocksize; 1162 } else { 1163 li->extLength = lip1->extLength + 1164 (((li->extLength & 1165 UDF_EXTENT_LENGTH_MASK) + 1166 blocksize - 1) & ~(blocksize - 1)); 1167 if (*endnum > (i + 2)) 1168 memmove(&laarr[i + 1], &laarr[i + 2], 1169 sizeof(struct long_ad) * 1170 (*endnum - (i + 2))); 1171 i--; 1172 (*endnum)--; 1173 } 1174 } else if ((li->extLength >> 30) == 1175 (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 1176 udf_free_blocks(inode->i_sb, inode, 1177 &li->extLocation, 0, 1178 ((li->extLength & 1179 UDF_EXTENT_LENGTH_MASK) + 1180 blocksize - 1) >> blocksize_bits); 1181 li->extLocation.logicalBlockNum = 0; 1182 li->extLocation.partitionReferenceNum = 0; 1183 li->extLength = (li->extLength & 1184 UDF_EXTENT_LENGTH_MASK) | 1185 EXT_NOT_RECORDED_NOT_ALLOCATED; 1186 } 1187 } 1188 } 1189 1190 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr, 1191 int startnum, int endnum, 1192 struct extent_position *epos) 1193 { 1194 int start = 0, i; 1195 struct kernel_lb_addr tmploc; 1196 uint32_t tmplen; 1197 int8_t tmpetype; 1198 int err; 1199 1200 if (startnum > endnum) { 1201 for (i = 0; i < (startnum - endnum); i++) 1202 udf_delete_aext(inode, *epos); 1203 } else if (startnum < endnum) { 1204 for (i = 0; i < (endnum - startnum); i++) { 1205 err = udf_insert_aext(inode, *epos, 1206 laarr[i].extLocation, 1207 laarr[i].extLength); 1208 /* 1209 * If we fail here, we are likely corrupting the extent 1210 * list and leaking blocks. At least stop early to 1211 * limit the damage. 1212 */ 1213 if (err < 0) 1214 return err; 1215 err = udf_next_aext(inode, epos, &laarr[i].extLocation, 1216 &laarr[i].extLength, &tmpetype, 1); 1217 if (err < 0) 1218 return err; 1219 start++; 1220 } 1221 } 1222 1223 for (i = start; i < endnum; i++) { 1224 err = udf_next_aext(inode, epos, &tmploc, &tmplen, &tmpetype, 0); 1225 if (err < 0) 1226 return err; 1227 1228 udf_write_aext(inode, epos, &laarr[i].extLocation, 1229 laarr[i].extLength, 1); 1230 } 1231 return 0; 1232 } 1233 1234 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block, 1235 int create, int *err) 1236 { 1237 struct buffer_head *bh = NULL; 1238 struct udf_map_rq map = { 1239 .lblk = block, 1240 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0), 1241 }; 1242 1243 *err = udf_map_block(inode, &map); 1244 if (*err || !(map.oflags & UDF_BLK_MAPPED)) 1245 return NULL; 1246 1247 bh = sb_getblk(inode->i_sb, map.pblk); 1248 if (!bh) { 1249 *err = -ENOMEM; 1250 return NULL; 1251 } 1252 if (map.oflags & UDF_BLK_NEW) { 1253 lock_buffer(bh); 1254 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); 1255 set_buffer_uptodate(bh); 1256 unlock_buffer(bh); 1257 mmb_mark_buffer_dirty(bh, &UDF_I(inode)->i_metadata_bhs); 1258 return bh; 1259 } 1260 1261 if (bh_read(bh, 0) >= 0) 1262 return bh; 1263 1264 brelse(bh); 1265 *err = -EIO; 1266 return NULL; 1267 } 1268 1269 int udf_setsize(struct inode *inode, loff_t newsize) 1270 { 1271 int err = 0; 1272 struct udf_inode_info *iinfo; 1273 unsigned int bsize = i_blocksize(inode); 1274 1275 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 1276 S_ISLNK(inode->i_mode))) 1277 return -EINVAL; 1278 1279 iinfo = UDF_I(inode); 1280 if (newsize > inode->i_size) { 1281 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1282 if (bsize >= 1283 (udf_file_entry_alloc_offset(inode) + newsize)) { 1284 down_write(&iinfo->i_data_sem); 1285 iinfo->i_lenAlloc = newsize; 1286 up_write(&iinfo->i_data_sem); 1287 goto set_size; 1288 } 1289 err = udf_expand_file_adinicb(inode); 1290 if (err) 1291 return err; 1292 } 1293 err = udf_extend_file(inode, newsize); 1294 if (err) 1295 return err; 1296 set_size: 1297 truncate_setsize(inode, newsize); 1298 } else { 1299 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1300 down_write(&iinfo->i_data_sem); 1301 udf_clear_extent_cache(inode); 1302 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize, 1303 0x00, bsize - newsize - 1304 udf_file_entry_alloc_offset(inode)); 1305 iinfo->i_lenAlloc = newsize; 1306 truncate_setsize(inode, newsize); 1307 up_write(&iinfo->i_data_sem); 1308 goto update_time; 1309 } 1310 err = block_truncate_page(inode->i_mapping, newsize, 1311 udf_get_block); 1312 if (err) 1313 return err; 1314 truncate_setsize(inode, newsize); 1315 down_write(&iinfo->i_data_sem); 1316 udf_clear_extent_cache(inode); 1317 err = udf_truncate_extents(inode); 1318 up_write(&iinfo->i_data_sem); 1319 if (err) 1320 return err; 1321 } 1322 update_time: 1323 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); 1324 mark_inode_dirty(inode); 1325 return err; 1326 } 1327 1328 /* 1329 * Maximum length of linked list formed by ICB hierarchy. The chosen number is 1330 * arbitrary - just that we hopefully don't limit any real use of rewritten 1331 * inode on write-once media but avoid looping for too long on corrupted media. 1332 */ 1333 #define UDF_MAX_ICB_NESTING 1024 1334 1335 static int udf_read_inode(struct inode *inode, bool hidden_inode) 1336 { 1337 struct buffer_head *bh = NULL; 1338 struct fileEntry *fe; 1339 struct extendedFileEntry *efe; 1340 uint16_t ident; 1341 struct udf_inode_info *iinfo = UDF_I(inode); 1342 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1343 struct kernel_lb_addr *iloc = &iinfo->i_location; 1344 unsigned int link_count; 1345 unsigned int indirections = 0; 1346 int bs = inode->i_sb->s_blocksize; 1347 int ret = -EIO; 1348 uint32_t uid, gid; 1349 struct timespec64 ts; 1350 1351 reread: 1352 if (iloc->partitionReferenceNum >= sbi->s_partitions) { 1353 udf_debug("partition reference: %u > logical volume partitions: %u\n", 1354 iloc->partitionReferenceNum, sbi->s_partitions); 1355 return -EIO; 1356 } 1357 1358 if (iloc->logicalBlockNum >= 1359 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) { 1360 udf_debug("block=%u, partition=%u out of range\n", 1361 iloc->logicalBlockNum, iloc->partitionReferenceNum); 1362 return -EIO; 1363 } 1364 1365 /* 1366 * Set defaults, but the inode is still incomplete! 1367 * Note: get_new_inode() sets the following on a new inode: 1368 * i_sb = sb 1369 * i_no = ino 1370 * i_flags = sb->s_flags 1371 * i_state = 0 1372 * clean_inode(): zero fills and sets 1373 * i_count = 1 1374 * i_nlink = 1 1375 * i_op = NULL; 1376 */ 1377 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident); 1378 if (!bh) { 1379 udf_err(inode->i_sb, "(ino %llu) failed !bh\n", inode->i_ino); 1380 return -EIO; 1381 } 1382 1383 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE && 1384 ident != TAG_IDENT_USE) { 1385 udf_err(inode->i_sb, "(ino %llu) failed ident=%u\n", 1386 inode->i_ino, ident); 1387 goto out; 1388 } 1389 1390 fe = (struct fileEntry *)bh->b_data; 1391 efe = (struct extendedFileEntry *)bh->b_data; 1392 1393 if (fe->icbTag.strategyType == cpu_to_le16(4096)) { 1394 struct buffer_head *ibh; 1395 1396 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident); 1397 if (ident == TAG_IDENT_IE && ibh) { 1398 struct kernel_lb_addr loc; 1399 struct indirectEntry *ie; 1400 1401 ie = (struct indirectEntry *)ibh->b_data; 1402 loc = lelb_to_cpu(ie->indirectICB.extLocation); 1403 1404 if (ie->indirectICB.extLength) { 1405 brelse(ibh); 1406 memcpy(&iinfo->i_location, &loc, 1407 sizeof(struct kernel_lb_addr)); 1408 if (++indirections > UDF_MAX_ICB_NESTING) { 1409 udf_err(inode->i_sb, 1410 "too many ICBs in ICB hierarchy" 1411 " (max %d supported)\n", 1412 UDF_MAX_ICB_NESTING); 1413 goto out; 1414 } 1415 brelse(bh); 1416 goto reread; 1417 } 1418 } 1419 brelse(ibh); 1420 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) { 1421 udf_err(inode->i_sb, "unsupported strategy type: %u\n", 1422 le16_to_cpu(fe->icbTag.strategyType)); 1423 goto out; 1424 } 1425 if (fe->icbTag.strategyType == cpu_to_le16(4)) 1426 iinfo->i_strat4096 = 0; 1427 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */ 1428 iinfo->i_strat4096 = 1; 1429 1430 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) & 1431 ICBTAG_FLAG_AD_MASK; 1432 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT && 1433 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG && 1434 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1435 ret = -EIO; 1436 goto out; 1437 } 1438 iinfo->i_hidden = hidden_inode; 1439 iinfo->i_unique = 0; 1440 iinfo->i_lenEAttr = 0; 1441 iinfo->i_lenExtents = 0; 1442 iinfo->i_lenAlloc = 0; 1443 iinfo->i_next_alloc_block = 0; 1444 iinfo->i_next_alloc_goal = 0; 1445 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) { 1446 iinfo->i_efe = 1; 1447 iinfo->i_use = 0; 1448 ret = udf_alloc_i_data(inode, bs - 1449 sizeof(struct extendedFileEntry)); 1450 if (ret) 1451 goto out; 1452 memcpy(iinfo->i_data, 1453 bh->b_data + sizeof(struct extendedFileEntry), 1454 bs - sizeof(struct extendedFileEntry)); 1455 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) { 1456 iinfo->i_efe = 0; 1457 iinfo->i_use = 0; 1458 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry)); 1459 if (ret) 1460 goto out; 1461 memcpy(iinfo->i_data, 1462 bh->b_data + sizeof(struct fileEntry), 1463 bs - sizeof(struct fileEntry)); 1464 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) { 1465 iinfo->i_efe = 0; 1466 iinfo->i_use = 1; 1467 iinfo->i_lenAlloc = le32_to_cpu( 1468 ((struct unallocSpaceEntry *)bh->b_data)-> 1469 lengthAllocDescs); 1470 ret = udf_alloc_i_data(inode, bs - 1471 sizeof(struct unallocSpaceEntry)); 1472 if (ret) 1473 goto out; 1474 memcpy(iinfo->i_data, 1475 bh->b_data + sizeof(struct unallocSpaceEntry), 1476 bs - sizeof(struct unallocSpaceEntry)); 1477 return 0; 1478 } 1479 1480 ret = -EIO; 1481 read_lock(&sbi->s_cred_lock); 1482 uid = le32_to_cpu(fe->uid); 1483 if (uid == UDF_INVALID_ID || 1484 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET)) 1485 inode->i_uid = sbi->s_uid; 1486 else 1487 i_uid_write(inode, uid); 1488 1489 gid = le32_to_cpu(fe->gid); 1490 if (gid == UDF_INVALID_ID || 1491 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET)) 1492 inode->i_gid = sbi->s_gid; 1493 else 1494 i_gid_write(inode, gid); 1495 1496 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY && 1497 sbi->s_fmode != UDF_INVALID_MODE) 1498 inode->i_mode = sbi->s_fmode; 1499 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY && 1500 sbi->s_dmode != UDF_INVALID_MODE) 1501 inode->i_mode = sbi->s_dmode; 1502 else 1503 inode->i_mode = udf_convert_permissions(fe); 1504 inode->i_mode &= ~sbi->s_umask; 1505 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS; 1506 1507 read_unlock(&sbi->s_cred_lock); 1508 1509 link_count = le16_to_cpu(fe->fileLinkCount); 1510 if (!link_count) { 1511 if (!hidden_inode) { 1512 ret = -ESTALE; 1513 goto out; 1514 } 1515 link_count = 1; 1516 } 1517 set_nlink(inode, link_count); 1518 1519 inode->i_size = le64_to_cpu(fe->informationLength); 1520 iinfo->i_lenExtents = inode->i_size; 1521 1522 if (iinfo->i_efe == 0) { 1523 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) << 1524 (inode->i_sb->s_blocksize_bits - 9); 1525 1526 udf_disk_stamp_to_time(&ts, fe->accessTime); 1527 inode_set_atime_to_ts(inode, ts); 1528 udf_disk_stamp_to_time(&ts, fe->modificationTime); 1529 inode_set_mtime_to_ts(inode, ts); 1530 udf_disk_stamp_to_time(&ts, fe->attrTime); 1531 inode_set_ctime_to_ts(inode, ts); 1532 1533 iinfo->i_unique = le64_to_cpu(fe->uniqueID); 1534 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr); 1535 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs); 1536 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint); 1537 iinfo->i_streamdir = 0; 1538 iinfo->i_lenStreams = 0; 1539 } else { 1540 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << 1541 (inode->i_sb->s_blocksize_bits - 9); 1542 1543 udf_disk_stamp_to_time(&ts, efe->accessTime); 1544 inode_set_atime_to_ts(inode, ts); 1545 udf_disk_stamp_to_time(&ts, efe->modificationTime); 1546 inode_set_mtime_to_ts(inode, ts); 1547 udf_disk_stamp_to_time(&ts, efe->attrTime); 1548 inode_set_ctime_to_ts(inode, ts); 1549 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime); 1550 1551 iinfo->i_unique = le64_to_cpu(efe->uniqueID); 1552 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr); 1553 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs); 1554 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); 1555 1556 /* Named streams */ 1557 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0); 1558 iinfo->i_locStreamdir = 1559 lelb_to_cpu(efe->streamDirectoryICB.extLocation); 1560 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize); 1561 if (iinfo->i_lenStreams >= inode->i_size) 1562 iinfo->i_lenStreams -= inode->i_size; 1563 else 1564 iinfo->i_lenStreams = 0; 1565 } 1566 inode->i_generation = iinfo->i_unique; 1567 1568 /* 1569 * Sanity check length of allocation descriptors and extended attrs to 1570 * avoid integer overflows 1571 */ 1572 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs) 1573 goto out; 1574 /* Now do exact checks */ 1575 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs) 1576 goto out; 1577 /* Sanity checks for files in ICB so that we don't get confused later */ 1578 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1579 /* 1580 * For file in ICB data is stored in allocation descriptor 1581 * so sizes should match 1582 */ 1583 if (iinfo->i_lenAlloc != inode->i_size) 1584 goto out; 1585 /* File in ICB has to fit in there... */ 1586 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode)) 1587 goto out; 1588 } 1589 1590 switch (fe->icbTag.fileType) { 1591 case ICBTAG_FILE_TYPE_DIRECTORY: 1592 inode->i_op = &udf_dir_inode_operations; 1593 inode->i_fop = &udf_dir_operations; 1594 inode->i_mode |= S_IFDIR; 1595 inc_nlink(inode); 1596 break; 1597 case ICBTAG_FILE_TYPE_REALTIME: 1598 case ICBTAG_FILE_TYPE_REGULAR: 1599 case ICBTAG_FILE_TYPE_UNDEF: 1600 case ICBTAG_FILE_TYPE_VAT20: 1601 inode->i_data.a_ops = &udf_aops; 1602 inode->i_op = &udf_file_inode_operations; 1603 inode->i_fop = &udf_file_operations; 1604 inode->i_mode |= S_IFREG; 1605 break; 1606 case ICBTAG_FILE_TYPE_BLOCK: 1607 inode->i_mode |= S_IFBLK; 1608 break; 1609 case ICBTAG_FILE_TYPE_CHAR: 1610 inode->i_mode |= S_IFCHR; 1611 break; 1612 case ICBTAG_FILE_TYPE_FIFO: 1613 init_special_inode(inode, inode->i_mode | S_IFIFO, 0); 1614 break; 1615 case ICBTAG_FILE_TYPE_SOCKET: 1616 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0); 1617 break; 1618 case ICBTAG_FILE_TYPE_SYMLINK: 1619 inode->i_data.a_ops = &udf_symlink_aops; 1620 inode->i_op = &udf_symlink_inode_operations; 1621 inode_nohighmem(inode); 1622 inode->i_mode = S_IFLNK | 0777; 1623 break; 1624 case ICBTAG_FILE_TYPE_MAIN: 1625 udf_debug("METADATA FILE-----\n"); 1626 break; 1627 case ICBTAG_FILE_TYPE_MIRROR: 1628 udf_debug("METADATA MIRROR FILE-----\n"); 1629 break; 1630 case ICBTAG_FILE_TYPE_BITMAP: 1631 udf_debug("METADATA BITMAP FILE-----\n"); 1632 break; 1633 default: 1634 udf_err(inode->i_sb, "(ino %llu) failed unknown file type=%u\n", 1635 inode->i_ino, fe->icbTag.fileType); 1636 goto out; 1637 } 1638 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1639 struct deviceSpec *dsea = 1640 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1641 if (dsea) { 1642 init_special_inode(inode, inode->i_mode, 1643 MKDEV(le32_to_cpu(dsea->majorDeviceIdent), 1644 le32_to_cpu(dsea->minorDeviceIdent))); 1645 /* Developer ID ??? */ 1646 } else 1647 goto out; 1648 } 1649 ret = 0; 1650 out: 1651 brelse(bh); 1652 return ret; 1653 } 1654 1655 static int udf_alloc_i_data(struct inode *inode, size_t size) 1656 { 1657 struct udf_inode_info *iinfo = UDF_I(inode); 1658 iinfo->i_data = kmalloc(size, GFP_KERNEL); 1659 if (!iinfo->i_data) 1660 return -ENOMEM; 1661 return 0; 1662 } 1663 1664 static umode_t udf_convert_permissions(struct fileEntry *fe) 1665 { 1666 umode_t mode; 1667 uint32_t permissions; 1668 uint32_t flags; 1669 1670 permissions = le32_to_cpu(fe->permissions); 1671 flags = le16_to_cpu(fe->icbTag.flags); 1672 1673 mode = ((permissions) & 0007) | 1674 ((permissions >> 2) & 0070) | 1675 ((permissions >> 4) & 0700) | 1676 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) | 1677 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) | 1678 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0); 1679 1680 return mode; 1681 } 1682 1683 void udf_update_extra_perms(struct inode *inode, umode_t mode) 1684 { 1685 struct udf_inode_info *iinfo = UDF_I(inode); 1686 1687 /* 1688 * UDF 2.01 sec. 3.3.3.3 Note 2: 1689 * In Unix, delete permission tracks write 1690 */ 1691 iinfo->i_extraPerms &= ~FE_DELETE_PERMS; 1692 if (mode & 0200) 1693 iinfo->i_extraPerms |= FE_PERM_U_DELETE; 1694 if (mode & 0020) 1695 iinfo->i_extraPerms |= FE_PERM_G_DELETE; 1696 if (mode & 0002) 1697 iinfo->i_extraPerms |= FE_PERM_O_DELETE; 1698 } 1699 1700 int udf_sync_inode_metadata(struct inode *inode, struct writeback_control *wbc) 1701 { 1702 struct buffer_head *bh; 1703 int err = 0; 1704 1705 bh = sb_getblk(inode->i_sb, 1706 udf_get_lb_pblock(inode->i_sb, 1707 &UDF_I(inode)->i_location, 0)); 1708 if (!bh) 1709 return -EIO; 1710 1711 sync_dirty_buffer(bh); 1712 if (buffer_write_io_error(bh)) { 1713 udf_warn(inode->i_sb, "IO error syncing udf inode [%08llx]\n", 1714 inode->i_ino); 1715 err = -EIO; 1716 goto out; 1717 } 1718 err = mmb_sync(&UDF_I(inode)->i_metadata_bhs); 1719 out: 1720 brelse(bh); 1721 return err; 1722 } 1723 1724 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time) 1725 { 1726 if (iinfo->i_crtime.tv_sec > time.tv_sec || 1727 (iinfo->i_crtime.tv_sec == time.tv_sec && 1728 iinfo->i_crtime.tv_nsec > time.tv_nsec)) 1729 iinfo->i_crtime = time; 1730 } 1731 1732 int udf_write_inode(struct inode *inode, struct writeback_control *wbc) 1733 { 1734 struct buffer_head *bh = NULL; 1735 struct fileEntry *fe; 1736 struct extendedFileEntry *efe; 1737 uint64_t lb_recorded; 1738 uint32_t udfperms; 1739 uint16_t icbflags; 1740 uint16_t crclen; 1741 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1742 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 1743 struct udf_inode_info *iinfo = UDF_I(inode); 1744 1745 bh = sb_getblk(inode->i_sb, 1746 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0)); 1747 if (!bh) { 1748 udf_debug("getblk failure\n"); 1749 return -EIO; 1750 } 1751 1752 lock_buffer(bh); 1753 memset(bh->b_data, 0, inode->i_sb->s_blocksize); 1754 fe = (struct fileEntry *)bh->b_data; 1755 efe = (struct extendedFileEntry *)bh->b_data; 1756 1757 if (iinfo->i_use) { 1758 struct unallocSpaceEntry *use = 1759 (struct unallocSpaceEntry *)bh->b_data; 1760 1761 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1762 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), 1763 iinfo->i_data, inode->i_sb->s_blocksize - 1764 sizeof(struct unallocSpaceEntry)); 1765 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE); 1766 crclen = sizeof(struct unallocSpaceEntry); 1767 1768 goto finish; 1769 } 1770 1771 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET)) 1772 fe->uid = cpu_to_le32(UDF_INVALID_ID); 1773 else 1774 fe->uid = cpu_to_le32(i_uid_read(inode)); 1775 1776 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET)) 1777 fe->gid = cpu_to_le32(UDF_INVALID_ID); 1778 else 1779 fe->gid = cpu_to_le32(i_gid_read(inode)); 1780 1781 udfperms = ((inode->i_mode & 0007)) | 1782 ((inode->i_mode & 0070) << 2) | 1783 ((inode->i_mode & 0700) << 4); 1784 1785 udfperms |= iinfo->i_extraPerms; 1786 fe->permissions = cpu_to_le32(udfperms); 1787 1788 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0) 1789 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1); 1790 else { 1791 if (iinfo->i_hidden) 1792 fe->fileLinkCount = cpu_to_le16(0); 1793 else 1794 fe->fileLinkCount = cpu_to_le16(inode->i_nlink); 1795 } 1796 1797 fe->informationLength = cpu_to_le64(inode->i_size); 1798 1799 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1800 struct regid *eid; 1801 struct deviceSpec *dsea = 1802 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1803 if (!dsea) { 1804 dsea = (struct deviceSpec *) 1805 udf_add_extendedattr(inode, 1806 sizeof(struct deviceSpec) + 1807 sizeof(struct regid), 12, 0x3); 1808 dsea->attrType = cpu_to_le32(12); 1809 dsea->attrSubtype = 1; 1810 dsea->attrLength = cpu_to_le32( 1811 sizeof(struct deviceSpec) + 1812 sizeof(struct regid)); 1813 dsea->impUseLength = cpu_to_le32(sizeof(struct regid)); 1814 } 1815 eid = (struct regid *)dsea->impUse; 1816 memset(eid, 0, sizeof(*eid)); 1817 strcpy(eid->ident, UDF_ID_DEVELOPER); 1818 eid->identSuffix[0] = UDF_OS_CLASS_UNIX; 1819 eid->identSuffix[1] = UDF_OS_ID_LINUX; 1820 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode)); 1821 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode)); 1822 } 1823 1824 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1825 lb_recorded = 0; /* No extents => no blocks! */ 1826 else 1827 lb_recorded = 1828 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >> 1829 (blocksize_bits - 9); 1830 1831 if (iinfo->i_efe == 0) { 1832 memcpy(bh->b_data + sizeof(struct fileEntry), 1833 iinfo->i_data, 1834 inode->i_sb->s_blocksize - sizeof(struct fileEntry)); 1835 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); 1836 1837 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode)); 1838 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode)); 1839 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode)); 1840 memset(&(fe->impIdent), 0, sizeof(struct regid)); 1841 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER); 1842 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1843 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1844 fe->uniqueID = cpu_to_le64(iinfo->i_unique); 1845 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); 1846 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1847 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint); 1848 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE); 1849 crclen = sizeof(struct fileEntry); 1850 } else { 1851 memcpy(bh->b_data + sizeof(struct extendedFileEntry), 1852 iinfo->i_data, 1853 inode->i_sb->s_blocksize - 1854 sizeof(struct extendedFileEntry)); 1855 efe->objectSize = 1856 cpu_to_le64(inode->i_size + iinfo->i_lenStreams); 1857 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); 1858 1859 if (iinfo->i_streamdir) { 1860 struct long_ad *icb_lad = &efe->streamDirectoryICB; 1861 1862 icb_lad->extLocation = 1863 cpu_to_lelb(iinfo->i_locStreamdir); 1864 icb_lad->extLength = 1865 cpu_to_le32(inode->i_sb->s_blocksize); 1866 } 1867 1868 udf_adjust_time(iinfo, inode_get_atime(inode)); 1869 udf_adjust_time(iinfo, inode_get_mtime(inode)); 1870 udf_adjust_time(iinfo, inode_get_ctime(inode)); 1871 1872 udf_time_to_disk_stamp(&efe->accessTime, 1873 inode_get_atime(inode)); 1874 udf_time_to_disk_stamp(&efe->modificationTime, 1875 inode_get_mtime(inode)); 1876 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime); 1877 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode)); 1878 1879 memset(&(efe->impIdent), 0, sizeof(efe->impIdent)); 1880 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER); 1881 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1882 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1883 efe->uniqueID = cpu_to_le64(iinfo->i_unique); 1884 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); 1885 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1886 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint); 1887 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE); 1888 crclen = sizeof(struct extendedFileEntry); 1889 } 1890 1891 finish: 1892 if (iinfo->i_strat4096) { 1893 fe->icbTag.strategyType = cpu_to_le16(4096); 1894 fe->icbTag.strategyParameter = cpu_to_le16(1); 1895 fe->icbTag.numEntries = cpu_to_le16(2); 1896 } else { 1897 fe->icbTag.strategyType = cpu_to_le16(4); 1898 fe->icbTag.numEntries = cpu_to_le16(1); 1899 } 1900 1901 if (iinfo->i_use) 1902 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE; 1903 else if (S_ISDIR(inode->i_mode)) 1904 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY; 1905 else if (S_ISREG(inode->i_mode)) 1906 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR; 1907 else if (S_ISLNK(inode->i_mode)) 1908 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK; 1909 else if (S_ISBLK(inode->i_mode)) 1910 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK; 1911 else if (S_ISCHR(inode->i_mode)) 1912 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR; 1913 else if (S_ISFIFO(inode->i_mode)) 1914 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO; 1915 else if (S_ISSOCK(inode->i_mode)) 1916 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET; 1917 1918 icbflags = iinfo->i_alloc_type | 1919 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) | 1920 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) | 1921 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) | 1922 (le16_to_cpu(fe->icbTag.flags) & 1923 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID | 1924 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY)); 1925 1926 fe->icbTag.flags = cpu_to_le16(icbflags); 1927 if (sbi->s_udfrev >= 0x0200) 1928 fe->descTag.descVersion = cpu_to_le16(3); 1929 else 1930 fe->descTag.descVersion = cpu_to_le16(2); 1931 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number); 1932 fe->descTag.tagLocation = cpu_to_le32( 1933 iinfo->i_location.logicalBlockNum); 1934 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag); 1935 fe->descTag.descCRCLength = cpu_to_le16(crclen); 1936 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag), 1937 crclen)); 1938 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag); 1939 1940 set_buffer_uptodate(bh); 1941 unlock_buffer(bh); 1942 1943 /* write the data blocks */ 1944 mark_buffer_dirty(bh); 1945 brelse(bh); 1946 set_inode_metadata_writeback(inode); 1947 1948 return 0; 1949 } 1950 1951 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino, 1952 bool hidden_inode) 1953 { 1954 unsigned long block = udf_get_lb_pblock(sb, ino, 0); 1955 struct inode *inode = iget_locked(sb, block); 1956 int err; 1957 1958 if (!inode) 1959 return ERR_PTR(-ENOMEM); 1960 1961 if (!(inode_state_read_once(inode) & I_NEW)) { 1962 if (UDF_I(inode)->i_hidden != hidden_inode) { 1963 iput(inode); 1964 return ERR_PTR(-EFSCORRUPTED); 1965 } 1966 return inode; 1967 } 1968 1969 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr)); 1970 err = udf_read_inode(inode, hidden_inode); 1971 if (err < 0) { 1972 iget_failed(inode); 1973 return ERR_PTR(err); 1974 } 1975 unlock_new_inode(inode); 1976 1977 return inode; 1978 } 1979 1980 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block, 1981 struct extent_position *epos) 1982 { 1983 struct super_block *sb = inode->i_sb; 1984 struct buffer_head *bh; 1985 struct allocExtDesc *aed; 1986 struct extent_position nepos; 1987 struct kernel_lb_addr neloc; 1988 int ver, adsize; 1989 int err = 0; 1990 1991 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 1992 adsize = sizeof(struct short_ad); 1993 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG) 1994 adsize = sizeof(struct long_ad); 1995 else 1996 return -EIO; 1997 1998 neloc.logicalBlockNum = block; 1999 neloc.partitionReferenceNum = epos->block.partitionReferenceNum; 2000 2001 bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0)); 2002 if (!bh) 2003 return -EIO; 2004 lock_buffer(bh); 2005 memset(bh->b_data, 0x00, sb->s_blocksize); 2006 set_buffer_uptodate(bh); 2007 unlock_buffer(bh); 2008 mmb_mark_buffer_dirty(bh, &UDF_I(inode)->i_metadata_bhs); 2009 2010 aed = (struct allocExtDesc *)(bh->b_data); 2011 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) { 2012 aed->previousAllocExtLocation = 2013 cpu_to_le32(epos->block.logicalBlockNum); 2014 } 2015 aed->lengthAllocDescs = cpu_to_le32(0); 2016 if (UDF_SB(sb)->s_udfrev >= 0x0200) 2017 ver = 3; 2018 else 2019 ver = 2; 2020 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block, 2021 sizeof(struct tag)); 2022 2023 nepos.block = neloc; 2024 nepos.offset = sizeof(struct allocExtDesc); 2025 nepos.bh = bh; 2026 2027 /* 2028 * Do we have to copy current last extent to make space for indirect 2029 * one? 2030 */ 2031 if (epos->offset + adsize > sb->s_blocksize) { 2032 struct kernel_lb_addr cp_loc; 2033 uint32_t cp_len; 2034 int8_t cp_type; 2035 2036 epos->offset -= adsize; 2037 err = udf_current_aext(inode, epos, &cp_loc, &cp_len, &cp_type, 0); 2038 if (err <= 0) 2039 goto err_out; 2040 cp_len |= ((uint32_t)cp_type) << 30; 2041 2042 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1); 2043 udf_write_aext(inode, epos, &nepos.block, 2044 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0); 2045 } else { 2046 __udf_add_aext(inode, epos, &nepos.block, 2047 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0); 2048 } 2049 2050 brelse(epos->bh); 2051 *epos = nepos; 2052 2053 return 0; 2054 err_out: 2055 brelse(bh); 2056 return err; 2057 } 2058 2059 /* 2060 * Append extent at the given position - should be the first free one in inode 2061 * / indirect extent. This function assumes there is enough space in the inode 2062 * or indirect extent. Use udf_add_aext() if you didn't check for this before. 2063 */ 2064 int __udf_add_aext(struct inode *inode, struct extent_position *epos, 2065 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 2066 { 2067 struct udf_inode_info *iinfo = UDF_I(inode); 2068 struct allocExtDesc *aed; 2069 int adsize; 2070 2071 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2072 adsize = sizeof(struct short_ad); 2073 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2074 adsize = sizeof(struct long_ad); 2075 else 2076 return -EIO; 2077 2078 if (!epos->bh) { 2079 WARN_ON(iinfo->i_lenAlloc != 2080 epos->offset - udf_file_entry_alloc_offset(inode)); 2081 } else { 2082 aed = (struct allocExtDesc *)epos->bh->b_data; 2083 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) != 2084 epos->offset - sizeof(struct allocExtDesc)); 2085 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize); 2086 } 2087 2088 udf_write_aext(inode, epos, eloc, elen, inc); 2089 2090 if (!epos->bh) { 2091 iinfo->i_lenAlloc += adsize; 2092 mark_inode_dirty(inode); 2093 } else { 2094 aed = (struct allocExtDesc *)epos->bh->b_data; 2095 le32_add_cpu(&aed->lengthAllocDescs, adsize); 2096 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2097 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2098 udf_update_tag(epos->bh->b_data, 2099 epos->offset + (inc ? 0 : adsize)); 2100 else 2101 udf_update_tag(epos->bh->b_data, 2102 sizeof(struct allocExtDesc)); 2103 mmb_mark_buffer_dirty(epos->bh, &iinfo->i_metadata_bhs); 2104 } 2105 2106 return 0; 2107 } 2108 2109 /* 2110 * Append extent at given position - should be the first free one in inode 2111 * / indirect extent. Takes care of allocating and linking indirect blocks. 2112 */ 2113 int udf_add_aext(struct inode *inode, struct extent_position *epos, 2114 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 2115 { 2116 int adsize; 2117 struct super_block *sb = inode->i_sb; 2118 2119 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2120 adsize = sizeof(struct short_ad); 2121 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2122 adsize = sizeof(struct long_ad); 2123 else 2124 return -EIO; 2125 2126 if (epos->offset + (2 * adsize) > sb->s_blocksize) { 2127 int err; 2128 udf_pblk_t new_block; 2129 2130 new_block = udf_new_block(sb, NULL, 2131 epos->block.partitionReferenceNum, 2132 epos->block.logicalBlockNum, &err); 2133 if (!new_block) 2134 return -ENOSPC; 2135 2136 err = udf_setup_indirect_aext(inode, new_block, epos); 2137 if (err) 2138 return err; 2139 } 2140 2141 return __udf_add_aext(inode, epos, eloc, elen, inc); 2142 } 2143 2144 void udf_write_aext(struct inode *inode, struct extent_position *epos, 2145 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 2146 { 2147 int adsize; 2148 uint8_t *ptr; 2149 struct short_ad *sad; 2150 struct long_ad *lad; 2151 struct udf_inode_info *iinfo = UDF_I(inode); 2152 2153 if (!epos->bh) 2154 ptr = iinfo->i_data + epos->offset - 2155 udf_file_entry_alloc_offset(inode) + 2156 iinfo->i_lenEAttr; 2157 else 2158 ptr = epos->bh->b_data + epos->offset; 2159 2160 switch (iinfo->i_alloc_type) { 2161 case ICBTAG_FLAG_AD_SHORT: 2162 sad = (struct short_ad *)ptr; 2163 sad->extLength = cpu_to_le32(elen); 2164 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum); 2165 adsize = sizeof(struct short_ad); 2166 break; 2167 case ICBTAG_FLAG_AD_LONG: 2168 lad = (struct long_ad *)ptr; 2169 lad->extLength = cpu_to_le32(elen); 2170 lad->extLocation = cpu_to_lelb(*eloc); 2171 memset(lad->impUse, 0x00, sizeof(lad->impUse)); 2172 adsize = sizeof(struct long_ad); 2173 break; 2174 default: 2175 return; 2176 } 2177 2178 if (epos->bh) { 2179 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2180 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) { 2181 struct allocExtDesc *aed = 2182 (struct allocExtDesc *)epos->bh->b_data; 2183 udf_update_tag(epos->bh->b_data, 2184 le32_to_cpu(aed->lengthAllocDescs) + 2185 sizeof(struct allocExtDesc)); 2186 } 2187 mmb_mark_buffer_dirty(epos->bh, &iinfo->i_metadata_bhs); 2188 } else { 2189 mark_inode_dirty(inode); 2190 } 2191 2192 if (inc) 2193 epos->offset += adsize; 2194 } 2195 2196 /* 2197 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case 2198 * someone does some weird stuff. 2199 */ 2200 #define UDF_MAX_INDIR_EXTS 16 2201 2202 /* 2203 * Returns 1 on success, -errno on error, 0 on hit EOF. 2204 */ 2205 int udf_next_aext(struct inode *inode, struct extent_position *epos, 2206 struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype, 2207 int inc) 2208 { 2209 unsigned int indirections = 0; 2210 int ret = 0; 2211 udf_pblk_t block; 2212 2213 while (1) { 2214 ret = udf_current_aext(inode, epos, eloc, elen, 2215 etype, inc); 2216 if (ret <= 0) 2217 return ret; 2218 if (*etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) 2219 return ret; 2220 2221 if (++indirections > UDF_MAX_INDIR_EXTS) { 2222 udf_err(inode->i_sb, 2223 "too many indirect extents in inode %llu\n", 2224 inode->i_ino); 2225 return -EFSCORRUPTED; 2226 } 2227 2228 epos->block = *eloc; 2229 epos->offset = sizeof(struct allocExtDesc); 2230 brelse(epos->bh); 2231 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0); 2232 epos->bh = sb_bread(inode->i_sb, block); 2233 if (!epos->bh) { 2234 udf_debug("reading block %u failed!\n", block); 2235 return -EIO; 2236 } 2237 } 2238 } 2239 2240 /* 2241 * Returns 1 on success, -errno on error, 0 on hit EOF. 2242 */ 2243 int udf_current_aext(struct inode *inode, struct extent_position *epos, 2244 struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype, 2245 int inc) 2246 { 2247 int alen; 2248 uint8_t *ptr; 2249 struct short_ad *sad; 2250 struct long_ad *lad; 2251 struct udf_inode_info *iinfo = UDF_I(inode); 2252 2253 if (!epos->bh) { 2254 if (!epos->offset) 2255 epos->offset = udf_file_entry_alloc_offset(inode); 2256 ptr = iinfo->i_data + epos->offset - 2257 udf_file_entry_alloc_offset(inode) + 2258 iinfo->i_lenEAttr; 2259 alen = udf_file_entry_alloc_offset(inode) + 2260 iinfo->i_lenAlloc; 2261 } else { 2262 struct allocExtDesc *header = 2263 (struct allocExtDesc *)epos->bh->b_data; 2264 2265 if (!epos->offset) 2266 epos->offset = sizeof(struct allocExtDesc); 2267 ptr = epos->bh->b_data + epos->offset; 2268 if (check_add_overflow(sizeof(struct allocExtDesc), 2269 le32_to_cpu(header->lengthAllocDescs), &alen)) 2270 return -1; 2271 2272 if (alen > epos->bh->b_size) 2273 return -1; 2274 } 2275 2276 switch (iinfo->i_alloc_type) { 2277 case ICBTAG_FLAG_AD_SHORT: 2278 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc); 2279 if (!sad) 2280 return 0; 2281 *etype = le32_to_cpu(sad->extLength) >> 30; 2282 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition); 2283 eloc->partitionReferenceNum = 2284 iinfo->i_location.partitionReferenceNum; 2285 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK; 2286 break; 2287 case ICBTAG_FLAG_AD_LONG: 2288 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc); 2289 if (!lad) 2290 return 0; 2291 *etype = le32_to_cpu(lad->extLength) >> 30; 2292 *eloc = lelb_to_cpu(lad->extLocation); 2293 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK; 2294 break; 2295 default: 2296 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type); 2297 return -EINVAL; 2298 } 2299 2300 return 1; 2301 } 2302 2303 static int udf_insert_aext(struct inode *inode, struct extent_position epos, 2304 struct kernel_lb_addr neloc, uint32_t nelen) 2305 { 2306 struct kernel_lb_addr oeloc; 2307 uint32_t oelen; 2308 int8_t etype; 2309 int ret; 2310 2311 if (epos.bh) 2312 get_bh(epos.bh); 2313 2314 while (1) { 2315 ret = udf_next_aext(inode, &epos, &oeloc, &oelen, &etype, 0); 2316 if (ret <= 0) 2317 break; 2318 udf_write_aext(inode, &epos, &neloc, nelen, 1); 2319 neloc = oeloc; 2320 nelen = (etype << 30) | oelen; 2321 } 2322 if (ret == 0) 2323 ret = udf_add_aext(inode, &epos, &neloc, nelen, 1); 2324 brelse(epos.bh); 2325 2326 return ret; 2327 } 2328 2329 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos) 2330 { 2331 struct extent_position oepos; 2332 int adsize; 2333 int8_t etype; 2334 struct allocExtDesc *aed; 2335 struct udf_inode_info *iinfo; 2336 struct kernel_lb_addr eloc; 2337 uint32_t elen; 2338 int ret; 2339 2340 if (epos.bh) { 2341 get_bh(epos.bh); 2342 get_bh(epos.bh); 2343 } 2344 2345 iinfo = UDF_I(inode); 2346 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2347 adsize = sizeof(struct short_ad); 2348 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2349 adsize = sizeof(struct long_ad); 2350 else 2351 adsize = 0; 2352 2353 oepos = epos; 2354 if (udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1) <= 0) 2355 return -1; 2356 2357 while (1) { 2358 ret = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1); 2359 if (ret < 0) { 2360 brelse(epos.bh); 2361 brelse(oepos.bh); 2362 return -1; 2363 } 2364 if (ret == 0) 2365 break; 2366 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1); 2367 if (oepos.bh != epos.bh) { 2368 oepos.block = epos.block; 2369 brelse(oepos.bh); 2370 get_bh(epos.bh); 2371 oepos.bh = epos.bh; 2372 oepos.offset = epos.offset - adsize; 2373 } 2374 } 2375 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr)); 2376 elen = 0; 2377 2378 if (epos.bh != oepos.bh) { 2379 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1); 2380 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2381 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2382 if (!oepos.bh) { 2383 iinfo->i_lenAlloc -= (adsize * 2); 2384 mark_inode_dirty(inode); 2385 } else { 2386 aed = (struct allocExtDesc *)oepos.bh->b_data; 2387 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize)); 2388 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2389 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2390 udf_update_tag(oepos.bh->b_data, 2391 oepos.offset - (2 * adsize)); 2392 else 2393 udf_update_tag(oepos.bh->b_data, 2394 sizeof(struct allocExtDesc)); 2395 mmb_mark_buffer_dirty(oepos.bh, &iinfo->i_metadata_bhs); 2396 } 2397 } else { 2398 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2399 if (!oepos.bh) { 2400 iinfo->i_lenAlloc -= adsize; 2401 mark_inode_dirty(inode); 2402 } else { 2403 aed = (struct allocExtDesc *)oepos.bh->b_data; 2404 le32_add_cpu(&aed->lengthAllocDescs, -adsize); 2405 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2406 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2407 udf_update_tag(oepos.bh->b_data, 2408 epos.offset - adsize); 2409 else 2410 udf_update_tag(oepos.bh->b_data, 2411 sizeof(struct allocExtDesc)); 2412 mmb_mark_buffer_dirty(oepos.bh, &iinfo->i_metadata_bhs); 2413 } 2414 } 2415 2416 brelse(epos.bh); 2417 brelse(oepos.bh); 2418 2419 return (elen >> 30); 2420 } 2421 2422 /* 2423 * Returns 1 on success, -errno on error, 0 on hit EOF. 2424 */ 2425 int inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos, 2426 struct kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset, 2427 int8_t *etype) 2428 { 2429 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 2430 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits; 2431 struct udf_inode_info *iinfo; 2432 int err = 0; 2433 2434 iinfo = UDF_I(inode); 2435 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) { 2436 pos->offset = 0; 2437 pos->block = iinfo->i_location; 2438 pos->bh = NULL; 2439 } 2440 *elen = 0; 2441 do { 2442 err = udf_next_aext(inode, pos, eloc, elen, etype, 1); 2443 if (err <= 0) { 2444 if (err == 0) { 2445 *offset = (bcount - lbcount) >> blocksize_bits; 2446 iinfo->i_lenExtents = lbcount; 2447 } 2448 return err; 2449 } 2450 lbcount += *elen; 2451 } while (lbcount <= bcount); 2452 /* update extent cache */ 2453 udf_update_extent_cache(inode, lbcount - *elen, pos); 2454 *offset = (bcount + *elen - lbcount) >> blocksize_bits; 2455 2456 return 1; 2457 } 2458