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_update_inode(struct inode *, int); 55 static int udf_sync_inode(struct inode *inode); 56 static int udf_alloc_i_data(struct inode *inode, size_t size); 57 static int inode_getblk(struct inode *inode, struct udf_map_rq *map); 58 static int udf_insert_aext(struct inode *, struct extent_position, 59 struct kernel_lb_addr, uint32_t); 60 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t, 61 struct kernel_long_ad *, int *); 62 static void udf_prealloc_extents(struct inode *, int, int, 63 struct kernel_long_ad *, int *); 64 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *); 65 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int, 66 int, struct extent_position *); 67 static int udf_get_block_wb(struct inode *inode, sector_t block, 68 struct buffer_head *bh_result, int create); 69 70 static void __udf_clear_extent_cache(struct inode *inode) 71 { 72 struct udf_inode_info *iinfo = UDF_I(inode); 73 74 if (iinfo->cached_extent.lstart != -1) { 75 brelse(iinfo->cached_extent.epos.bh); 76 iinfo->cached_extent.lstart = -1; 77 } 78 } 79 80 /* Invalidate extent cache */ 81 static void udf_clear_extent_cache(struct inode *inode) 82 { 83 struct udf_inode_info *iinfo = UDF_I(inode); 84 85 spin_lock(&iinfo->i_extent_cache_lock); 86 __udf_clear_extent_cache(inode); 87 spin_unlock(&iinfo->i_extent_cache_lock); 88 } 89 90 /* Return contents of extent cache */ 91 static int udf_read_extent_cache(struct inode *inode, loff_t bcount, 92 loff_t *lbcount, struct extent_position *pos) 93 { 94 struct udf_inode_info *iinfo = UDF_I(inode); 95 int ret = 0; 96 97 spin_lock(&iinfo->i_extent_cache_lock); 98 if ((iinfo->cached_extent.lstart <= bcount) && 99 (iinfo->cached_extent.lstart != -1)) { 100 /* Cache hit */ 101 *lbcount = iinfo->cached_extent.lstart; 102 memcpy(pos, &iinfo->cached_extent.epos, 103 sizeof(struct extent_position)); 104 if (pos->bh) 105 get_bh(pos->bh); 106 ret = 1; 107 } 108 spin_unlock(&iinfo->i_extent_cache_lock); 109 return ret; 110 } 111 112 /* Add extent to extent cache */ 113 static void udf_update_extent_cache(struct inode *inode, loff_t estart, 114 struct extent_position *pos) 115 { 116 struct udf_inode_info *iinfo = UDF_I(inode); 117 118 spin_lock(&iinfo->i_extent_cache_lock); 119 /* Invalidate previously cached extent */ 120 __udf_clear_extent_cache(inode); 121 if (pos->bh) 122 get_bh(pos->bh); 123 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos)); 124 iinfo->cached_extent.lstart = estart; 125 switch (iinfo->i_alloc_type) { 126 case ICBTAG_FLAG_AD_SHORT: 127 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad); 128 break; 129 case ICBTAG_FLAG_AD_LONG: 130 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad); 131 break; 132 } 133 spin_unlock(&iinfo->i_extent_cache_lock); 134 } 135 136 void udf_evict_inode(struct inode *inode) 137 { 138 struct udf_inode_info *iinfo = UDF_I(inode); 139 int want_delete = 0; 140 141 if (!is_bad_inode(inode)) { 142 if (!inode->i_nlink) { 143 want_delete = 1; 144 udf_setsize(inode, 0); 145 udf_update_inode(inode, IS_SYNC(inode)); 146 } 147 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && 148 inode->i_size != iinfo->i_lenExtents) { 149 udf_warn(inode->i_sb, 150 "Inode %llu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n", 151 inode->i_ino, inode->i_mode, 152 (unsigned long long)inode->i_size, 153 (unsigned long long)iinfo->i_lenExtents); 154 } 155 } 156 truncate_inode_pages_final(&inode->i_data); 157 if (!want_delete) 158 mmb_sync(&iinfo->i_metadata_bhs); 159 mmb_invalidate(&iinfo->i_metadata_bhs); 160 clear_inode(inode); 161 kfree(iinfo->i_data); 162 iinfo->i_data = NULL; 163 udf_clear_extent_cache(inode); 164 if (want_delete) { 165 udf_free_inode(inode); 166 } 167 } 168 169 static void udf_write_failed(struct address_space *mapping, loff_t to) 170 { 171 struct inode *inode = mapping->host; 172 struct udf_inode_info *iinfo = UDF_I(inode); 173 loff_t isize = inode->i_size; 174 175 if (to > isize) { 176 truncate_pagecache(inode, isize); 177 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 178 down_write(&iinfo->i_data_sem); 179 udf_clear_extent_cache(inode); 180 udf_truncate_extents(inode); 181 up_write(&iinfo->i_data_sem); 182 } 183 } 184 } 185 186 static int udf_handle_page_wb(struct folio *folio, 187 struct writeback_control *wbc) 188 { 189 struct inode *inode = folio->mapping->host; 190 struct udf_inode_info *iinfo = UDF_I(inode); 191 192 /* 193 * Inodes in the normal format are handled by the generic code. This 194 * check is race-free as the folio lock protects us from inode type 195 * conversion. 196 */ 197 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) 198 return 1; 199 200 memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 201 0, i_size_read(inode)); 202 folio_unlock(folio); 203 mark_inode_dirty(inode); 204 return 0; 205 } 206 207 static int udf_writepages(struct address_space *mapping, 208 struct writeback_control *wbc) 209 { 210 return __mpage_writepages(mapping, wbc, udf_get_block_wb, 211 udf_handle_page_wb); 212 } 213 214 static void udf_adinicb_read_folio(struct folio *folio) 215 { 216 struct inode *inode = folio->mapping->host; 217 struct udf_inode_info *iinfo = UDF_I(inode); 218 loff_t isize = i_size_read(inode); 219 220 folio_fill_tail(folio, 0, iinfo->i_data + iinfo->i_lenEAttr, isize); 221 folio_mark_uptodate(folio); 222 } 223 224 static int udf_read_folio(struct file *file, struct folio *folio) 225 { 226 struct udf_inode_info *iinfo = UDF_I(file_inode(file)); 227 228 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 229 udf_adinicb_read_folio(folio); 230 folio_unlock(folio); 231 return 0; 232 } 233 return mpage_read_folio(folio, udf_get_block); 234 } 235 236 static void udf_readahead(struct readahead_control *rac) 237 { 238 struct udf_inode_info *iinfo = UDF_I(rac->mapping->host); 239 240 /* 241 * No readahead needed for in-ICB files and udf_get_block() would get 242 * confused for such file anyway. 243 */ 244 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 245 return; 246 247 mpage_readahead(rac, udf_get_block); 248 } 249 250 static int udf_write_begin(const struct kiocb *iocb, 251 struct address_space *mapping, 252 loff_t pos, unsigned len, 253 struct folio **foliop, void **fsdata) 254 { 255 struct file *file = iocb->ki_filp; 256 struct udf_inode_info *iinfo = UDF_I(file_inode(file)); 257 struct folio *folio; 258 int ret; 259 260 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 261 ret = block_write_begin(mapping, pos, len, foliop, 262 udf_get_block); 263 if (unlikely(ret)) 264 udf_write_failed(mapping, pos + len); 265 return ret; 266 } 267 if (WARN_ON_ONCE(pos >= PAGE_SIZE)) 268 return -EIO; 269 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN, 270 mapping_gfp_mask(mapping)); 271 if (IS_ERR(folio)) 272 return PTR_ERR(folio); 273 *foliop = folio; 274 if (!folio_test_uptodate(folio)) 275 udf_adinicb_read_folio(folio); 276 return 0; 277 } 278 279 static int udf_write_end(const struct kiocb *iocb, 280 struct address_space *mapping, 281 loff_t pos, unsigned len, unsigned copied, 282 struct folio *folio, void *fsdata) 283 { 284 struct inode *inode = file_inode(iocb->ki_filp); 285 loff_t last_pos; 286 287 if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) 288 return generic_write_end(iocb, mapping, pos, len, copied, folio, 289 fsdata); 290 last_pos = pos + copied; 291 if (last_pos > inode->i_size) 292 i_size_write(inode, last_pos); 293 folio_mark_dirty(folio); 294 folio_unlock(folio); 295 folio_put(folio); 296 297 return copied; 298 } 299 300 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 301 { 302 struct file *file = iocb->ki_filp; 303 struct address_space *mapping = file->f_mapping; 304 struct inode *inode = mapping->host; 305 size_t count = iov_iter_count(iter); 306 ssize_t ret; 307 308 /* Fallback to buffered IO for in-ICB files */ 309 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 310 return 0; 311 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block); 312 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE)) 313 udf_write_failed(mapping, iocb->ki_pos + count); 314 return ret; 315 } 316 317 static sector_t udf_bmap(struct address_space *mapping, sector_t block) 318 { 319 struct udf_inode_info *iinfo = UDF_I(mapping->host); 320 321 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 322 return -EINVAL; 323 return generic_block_bmap(mapping, block, udf_get_block); 324 } 325 326 const struct address_space_operations udf_aops = { 327 .dirty_folio = block_dirty_folio, 328 .invalidate_folio = block_invalidate_folio, 329 .read_folio = udf_read_folio, 330 .readahead = udf_readahead, 331 .writepages = udf_writepages, 332 .write_begin = udf_write_begin, 333 .write_end = udf_write_end, 334 .direct_IO = udf_direct_IO, 335 .bmap = udf_bmap, 336 .migrate_folio = buffer_migrate_folio, 337 }; 338 339 /* 340 * Expand file stored in ICB to a normal one-block-file 341 * 342 * This function requires i_mutex held 343 */ 344 int udf_expand_file_adinicb(struct inode *inode) 345 { 346 struct folio *folio; 347 struct udf_inode_info *iinfo = UDF_I(inode); 348 int err; 349 350 WARN_ON_ONCE(!inode_is_locked(inode)); 351 if (!iinfo->i_lenAlloc) { 352 down_write(&iinfo->i_data_sem); 353 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 354 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; 355 else 356 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; 357 up_write(&iinfo->i_data_sem); 358 mark_inode_dirty(inode); 359 return 0; 360 } 361 362 folio = __filemap_get_folio(inode->i_mapping, 0, 363 FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL); 364 if (IS_ERR(folio)) 365 return PTR_ERR(folio); 366 367 if (!folio_test_uptodate(folio)) 368 udf_adinicb_read_folio(folio); 369 down_write(&iinfo->i_data_sem); 370 memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00, 371 iinfo->i_lenAlloc); 372 iinfo->i_lenAlloc = 0; 373 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 374 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; 375 else 376 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; 377 folio_mark_dirty(folio); 378 folio_unlock(folio); 379 up_write(&iinfo->i_data_sem); 380 err = filemap_fdatawrite(inode->i_mapping); 381 if (err) { 382 /* Restore everything back so that we don't lose data... */ 383 folio_lock(folio); 384 down_write(&iinfo->i_data_sem); 385 memcpy_from_folio(iinfo->i_data + iinfo->i_lenEAttr, 386 folio, 0, inode->i_size); 387 folio_unlock(folio); 388 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; 389 iinfo->i_lenAlloc = inode->i_size; 390 up_write(&iinfo->i_data_sem); 391 } 392 folio_put(folio); 393 mark_inode_dirty(inode); 394 395 return err; 396 } 397 398 #define UDF_MAP_CREATE 0x01 /* Mapping can allocate new blocks */ 399 #define UDF_MAP_NOPREALLOC 0x02 /* Do not preallocate blocks */ 400 401 #define UDF_BLK_MAPPED 0x01 /* Block was successfully mapped */ 402 #define UDF_BLK_NEW 0x02 /* Block was freshly allocated */ 403 404 struct udf_map_rq { 405 sector_t lblk; 406 udf_pblk_t pblk; 407 int iflags; /* UDF_MAP_ flags determining behavior */ 408 int oflags; /* UDF_BLK_ flags reporting results */ 409 }; 410 411 static int udf_map_block(struct inode *inode, struct udf_map_rq *map) 412 { 413 int ret; 414 struct udf_inode_info *iinfo = UDF_I(inode); 415 416 if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)) 417 return -EFSCORRUPTED; 418 419 map->oflags = 0; 420 if (!(map->iflags & UDF_MAP_CREATE)) { 421 struct kernel_lb_addr eloc; 422 uint32_t elen; 423 sector_t offset; 424 struct extent_position epos = {}; 425 int8_t etype; 426 427 down_read(&iinfo->i_data_sem); 428 ret = inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset, 429 &etype); 430 if (ret < 0) 431 goto out_read; 432 if (ret > 0 && etype == (EXT_RECORDED_ALLOCATED >> 30)) { 433 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, 434 offset); 435 map->oflags |= UDF_BLK_MAPPED; 436 ret = 0; 437 } 438 out_read: 439 up_read(&iinfo->i_data_sem); 440 brelse(epos.bh); 441 442 return ret; 443 } 444 445 down_write(&iinfo->i_data_sem); 446 /* 447 * Block beyond EOF and prealloc extents? Just discard preallocation 448 * as it is not useful and complicates things. 449 */ 450 if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents) 451 udf_discard_prealloc(inode); 452 udf_clear_extent_cache(inode); 453 ret = inode_getblk(inode, map); 454 up_write(&iinfo->i_data_sem); 455 return ret; 456 } 457 458 static int __udf_get_block(struct inode *inode, sector_t block, 459 struct buffer_head *bh_result, int flags) 460 { 461 int err; 462 struct udf_map_rq map = { 463 .lblk = block, 464 .iflags = flags, 465 }; 466 467 err = udf_map_block(inode, &map); 468 if (err < 0) 469 return err; 470 if (map.oflags & UDF_BLK_MAPPED) { 471 map_bh(bh_result, inode->i_sb, map.pblk); 472 if (map.oflags & UDF_BLK_NEW) 473 set_buffer_new(bh_result); 474 } 475 return 0; 476 } 477 478 int udf_get_block(struct inode *inode, sector_t block, 479 struct buffer_head *bh_result, int create) 480 { 481 int flags = create ? UDF_MAP_CREATE : 0; 482 483 /* 484 * We preallocate blocks only for regular files. It also makes sense 485 * for directories but there's a problem when to drop the 486 * preallocation. We might use some delayed work for that but I feel 487 * it's overengineering for a filesystem like UDF. 488 */ 489 if (!S_ISREG(inode->i_mode)) 490 flags |= UDF_MAP_NOPREALLOC; 491 return __udf_get_block(inode, block, bh_result, flags); 492 } 493 494 /* 495 * We shouldn't be allocating blocks on page writeback since we allocate them 496 * on page fault. We can spot dirty buffers without allocated blocks though 497 * when truncate expands file. These however don't have valid data so we can 498 * safely ignore them. So never allocate blocks from page writeback. 499 */ 500 static int udf_get_block_wb(struct inode *inode, sector_t block, 501 struct buffer_head *bh_result, int create) 502 { 503 return __udf_get_block(inode, block, bh_result, 0); 504 } 505 506 /* Extend the file with new blocks totaling 'new_block_bytes', 507 * return the number of extents added 508 */ 509 static int udf_do_extend_file(struct inode *inode, 510 struct extent_position *last_pos, 511 struct kernel_long_ad *last_ext, 512 loff_t new_block_bytes) 513 { 514 uint32_t add; 515 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 516 struct super_block *sb = inode->i_sb; 517 struct udf_inode_info *iinfo; 518 int err; 519 520 /* The previous extent is fake and we should not extend by anything 521 * - there's nothing to do... */ 522 if (!new_block_bytes && fake) 523 return 0; 524 525 iinfo = UDF_I(inode); 526 /* Round the last extent up to a multiple of block size */ 527 if (last_ext->extLength & (sb->s_blocksize - 1)) { 528 last_ext->extLength = 529 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) | 530 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) + 531 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); 532 iinfo->i_lenExtents = 533 (iinfo->i_lenExtents + sb->s_blocksize - 1) & 534 ~(sb->s_blocksize - 1); 535 } 536 537 add = 0; 538 /* Can we merge with the previous extent? */ 539 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == 540 EXT_NOT_RECORDED_NOT_ALLOCATED) { 541 add = (1 << 30) - sb->s_blocksize - 542 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 543 if (add > new_block_bytes) 544 add = new_block_bytes; 545 new_block_bytes -= add; 546 last_ext->extLength += add; 547 } 548 549 if (fake) { 550 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 551 last_ext->extLength, 1); 552 if (err < 0) 553 goto out_err; 554 count++; 555 } else { 556 struct kernel_lb_addr tmploc; 557 uint32_t tmplen; 558 int8_t tmptype; 559 560 udf_write_aext(inode, last_pos, &last_ext->extLocation, 561 last_ext->extLength, 1); 562 563 /* 564 * We've rewritten the last extent. If we are going to add 565 * more extents, we may need to enter possible following 566 * empty indirect extent. 567 */ 568 if (new_block_bytes) { 569 err = udf_next_aext(inode, last_pos, &tmploc, &tmplen, 570 &tmptype, 0); 571 if (err < 0) 572 goto out_err; 573 } 574 } 575 iinfo->i_lenExtents += add; 576 577 /* Managed to do everything necessary? */ 578 if (!new_block_bytes) 579 goto out; 580 581 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */ 582 last_ext->extLocation.logicalBlockNum = 0; 583 last_ext->extLocation.partitionReferenceNum = 0; 584 add = (1 << 30) - sb->s_blocksize; 585 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add; 586 587 /* Create enough extents to cover the whole hole */ 588 while (new_block_bytes > add) { 589 new_block_bytes -= add; 590 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 591 last_ext->extLength, 1); 592 if (err) 593 goto out_err; 594 iinfo->i_lenExtents += add; 595 count++; 596 } 597 if (new_block_bytes) { 598 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 599 new_block_bytes; 600 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 601 last_ext->extLength, 1); 602 if (err) 603 goto out_err; 604 iinfo->i_lenExtents += new_block_bytes; 605 count++; 606 } 607 608 out: 609 /* last_pos should point to the last written extent... */ 610 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 611 last_pos->offset -= sizeof(struct short_ad); 612 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 613 last_pos->offset -= sizeof(struct long_ad); 614 else 615 return -EIO; 616 617 return count; 618 out_err: 619 /* Remove extents we've created so far */ 620 udf_clear_extent_cache(inode); 621 udf_truncate_extents(inode); 622 return err; 623 } 624 625 /* Extend the final block of the file to final_block_len bytes */ 626 static void udf_do_extend_final_block(struct inode *inode, 627 struct extent_position *last_pos, 628 struct kernel_long_ad *last_ext, 629 uint32_t new_elen) 630 { 631 uint32_t added_bytes; 632 633 /* 634 * Extent already large enough? It may be already rounded up to block 635 * size... 636 */ 637 if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) 638 return; 639 added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 640 last_ext->extLength += added_bytes; 641 UDF_I(inode)->i_lenExtents += added_bytes; 642 643 udf_write_aext(inode, last_pos, &last_ext->extLocation, 644 last_ext->extLength, 1); 645 } 646 647 static int udf_extend_file(struct inode *inode, loff_t newsize) 648 { 649 650 struct extent_position epos; 651 struct kernel_lb_addr eloc; 652 uint32_t elen; 653 int8_t etype; 654 struct super_block *sb = inode->i_sb; 655 sector_t first_block = newsize >> sb->s_blocksize_bits, offset; 656 loff_t new_elen; 657 int adsize; 658 struct udf_inode_info *iinfo = UDF_I(inode); 659 struct kernel_long_ad extent; 660 int err = 0; 661 bool within_last_ext; 662 663 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 664 adsize = sizeof(struct short_ad); 665 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 666 adsize = sizeof(struct long_ad); 667 else 668 BUG(); 669 670 down_write(&iinfo->i_data_sem); 671 /* 672 * When creating hole in file, just don't bother with preserving 673 * preallocation. It likely won't be very useful anyway. 674 */ 675 udf_discard_prealloc(inode); 676 677 err = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset, &etype); 678 if (err < 0) 679 goto out; 680 within_last_ext = (err == 1); 681 /* We don't expect extents past EOF... */ 682 WARN_ON_ONCE(within_last_ext && 683 elen > ((loff_t)offset + 1) << inode->i_blkbits); 684 685 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) || 686 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) { 687 /* File has no extents at all or has empty last 688 * indirect extent! Create a fake extent... */ 689 extent.extLocation.logicalBlockNum = 0; 690 extent.extLocation.partitionReferenceNum = 0; 691 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 692 } else { 693 epos.offset -= adsize; 694 err = udf_next_aext(inode, &epos, &extent.extLocation, 695 &extent.extLength, &etype, 0); 696 if (err <= 0) 697 goto out; 698 extent.extLength |= etype << 30; 699 } 700 701 new_elen = ((loff_t)offset << inode->i_blkbits) | 702 (newsize & (sb->s_blocksize - 1)); 703 704 /* File has extent covering the new size (could happen when extending 705 * inside a block)? 706 */ 707 if (within_last_ext) { 708 /* Extending file within the last file block */ 709 udf_do_extend_final_block(inode, &epos, &extent, new_elen); 710 } else { 711 err = udf_do_extend_file(inode, &epos, &extent, new_elen); 712 } 713 714 if (err < 0) 715 goto out; 716 err = 0; 717 out: 718 brelse(epos.bh); 719 up_write(&iinfo->i_data_sem); 720 return err; 721 } 722 723 static int inode_getblk(struct inode *inode, struct udf_map_rq *map) 724 { 725 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE]; 726 struct extent_position prev_epos, cur_epos, next_epos; 727 int count = 0, startnum = 0, endnum = 0; 728 uint32_t elen = 0, tmpelen; 729 struct kernel_lb_addr eloc, tmpeloc; 730 int c = 1; 731 loff_t lbcount = 0, b_off = 0; 732 udf_pblk_t newblocknum; 733 sector_t offset = 0; 734 int8_t etype, tmpetype; 735 struct udf_inode_info *iinfo = UDF_I(inode); 736 udf_pblk_t goal = 0, pgoal = 0; 737 int lastblock = 0; 738 bool isBeyondEOF = false; 739 int ret = 0; 740 741 prev_epos.offset = udf_file_entry_alloc_offset(inode); 742 prev_epos.block = iinfo->i_location; 743 prev_epos.bh = NULL; 744 cur_epos = next_epos = prev_epos; 745 b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits; 746 747 /* find the extent which contains the block we are looking for. 748 alternate between laarr[0] and laarr[1] for locations of the 749 current extent, and the previous extent */ 750 do { 751 if (prev_epos.bh != cur_epos.bh) { 752 brelse(prev_epos.bh); 753 get_bh(cur_epos.bh); 754 prev_epos.bh = cur_epos.bh; 755 } 756 if (cur_epos.bh != next_epos.bh) { 757 brelse(cur_epos.bh); 758 get_bh(next_epos.bh); 759 cur_epos.bh = next_epos.bh; 760 } 761 762 lbcount += elen; 763 764 prev_epos.block = cur_epos.block; 765 cur_epos.block = next_epos.block; 766 767 prev_epos.offset = cur_epos.offset; 768 cur_epos.offset = next_epos.offset; 769 770 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 1); 771 if (ret < 0) { 772 goto out_free; 773 } else if (ret == 0) { 774 isBeyondEOF = true; 775 break; 776 } 777 778 c = !c; 779 780 laarr[c].extLength = (etype << 30) | elen; 781 laarr[c].extLocation = eloc; 782 783 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 784 pgoal = eloc.logicalBlockNum + 785 ((elen + inode->i_sb->s_blocksize - 1) >> 786 inode->i_sb->s_blocksize_bits); 787 788 count++; 789 } while (lbcount + elen <= b_off); 790 791 b_off -= lbcount; 792 offset = b_off >> inode->i_sb->s_blocksize_bits; 793 /* 794 * Move prev_epos and cur_epos into indirect extent if we are at 795 * the pointer to it 796 */ 797 ret = udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, &tmpetype, 0); 798 if (ret < 0) 799 goto out_free; 800 ret = udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, &tmpetype, 0); 801 if (ret < 0) 802 goto out_free; 803 804 /* if the extent is allocated and recorded, return the block 805 if the extent is not a multiple of the blocksize, round up */ 806 807 if (!isBeyondEOF && etype == (EXT_RECORDED_ALLOCATED >> 30)) { 808 if (elen & (inode->i_sb->s_blocksize - 1)) { 809 elen = EXT_RECORDED_ALLOCATED | 810 ((elen + inode->i_sb->s_blocksize - 1) & 811 ~(inode->i_sb->s_blocksize - 1)); 812 iinfo->i_lenExtents = 813 ALIGN(iinfo->i_lenExtents, 814 inode->i_sb->s_blocksize); 815 udf_write_aext(inode, &cur_epos, &eloc, elen, 1); 816 } 817 map->oflags = UDF_BLK_MAPPED; 818 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset); 819 ret = 0; 820 goto out_free; 821 } 822 823 /* Are we beyond EOF and preallocated extent? */ 824 if (isBeyondEOF) { 825 loff_t hole_len; 826 827 if (count) { 828 if (c) 829 laarr[0] = laarr[1]; 830 startnum = 1; 831 } else { 832 /* Create a fake extent when there's not one */ 833 memset(&laarr[0].extLocation, 0x00, 834 sizeof(struct kernel_lb_addr)); 835 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 836 /* Will udf_do_extend_file() create real extent from 837 a fake one? */ 838 startnum = (offset > 0); 839 } 840 /* Create extents for the hole between EOF and offset */ 841 hole_len = (loff_t)offset << inode->i_blkbits; 842 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len); 843 if (ret < 0) 844 goto out_free; 845 c = 0; 846 offset = 0; 847 count += ret; 848 /* 849 * Is there any real extent? - otherwise we overwrite the fake 850 * one... 851 */ 852 if (count) 853 c = !c; 854 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 855 inode->i_sb->s_blocksize; 856 memset(&laarr[c].extLocation, 0x00, 857 sizeof(struct kernel_lb_addr)); 858 count++; 859 endnum = c + 1; 860 lastblock = 1; 861 } else { 862 endnum = startnum = ((count > 2) ? 2 : count); 863 864 /* if the current extent is in position 0, 865 swap it with the previous */ 866 if (!c && count != 1) { 867 laarr[2] = laarr[0]; 868 laarr[0] = laarr[1]; 869 laarr[1] = laarr[2]; 870 c = 1; 871 } 872 873 /* if the current block is located in an extent, 874 read the next extent */ 875 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 0); 876 if (ret > 0) { 877 laarr[c + 1].extLength = (etype << 30) | elen; 878 laarr[c + 1].extLocation = eloc; 879 count++; 880 startnum++; 881 endnum++; 882 } else if (ret == 0) 883 lastblock = 1; 884 else 885 goto out_free; 886 } 887 888 /* if the current extent is not recorded but allocated, get the 889 * block in the extent corresponding to the requested block */ 890 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 891 newblocknum = laarr[c].extLocation.logicalBlockNum + offset; 892 else { /* otherwise, allocate a new block */ 893 if (iinfo->i_next_alloc_block == map->lblk) 894 goal = iinfo->i_next_alloc_goal; 895 if (!goal) 896 goal = pgoal; 897 if (!goal) 898 goal = iinfo->i_location.logicalBlockNum + 1; 899 900 newblocknum = udf_new_block(inode->i_sb, inode, 901 iinfo->i_location.partitionReferenceNum, 902 goal, &ret); 903 if (!newblocknum) 904 goto out_free; 905 if (isBeyondEOF) 906 iinfo->i_lenExtents += inode->i_sb->s_blocksize; 907 } 908 909 /* if the extent the requsted block is located in contains multiple 910 * blocks, split the extent into at most three extents. blocks prior 911 * to requested block, requested block, and blocks after requested 912 * block */ 913 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum); 914 915 if (!(map->iflags & UDF_MAP_NOPREALLOC)) 916 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); 917 918 /* merge any continuous blocks in laarr */ 919 udf_merge_extents(inode, laarr, &endnum); 920 921 /* write back the new extents, inserting new extents if the new number 922 * of extents is greater than the old number, and deleting extents if 923 * the new number of extents is less than the old number */ 924 ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos); 925 if (ret < 0) 926 goto out_free; 927 928 map->pblk = udf_get_pblock(inode->i_sb, newblocknum, 929 iinfo->i_location.partitionReferenceNum, 0); 930 if (!map->pblk) { 931 ret = -EFSCORRUPTED; 932 goto out_free; 933 } 934 map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED; 935 iinfo->i_next_alloc_block = map->lblk + 1; 936 iinfo->i_next_alloc_goal = newblocknum + 1; 937 inode_set_ctime_current(inode); 938 939 if (IS_SYNC(inode)) 940 udf_sync_inode(inode); 941 else 942 mark_inode_dirty(inode); 943 ret = 0; 944 out_free: 945 brelse(prev_epos.bh); 946 brelse(cur_epos.bh); 947 brelse(next_epos.bh); 948 return ret; 949 } 950 951 static void udf_split_extents(struct inode *inode, int *c, int offset, 952 udf_pblk_t newblocknum, 953 struct kernel_long_ad *laarr, int *endnum) 954 { 955 unsigned long blocksize = inode->i_sb->s_blocksize; 956 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 957 958 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) || 959 (laarr[*c].extLength >> 30) == 960 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 961 int curr = *c; 962 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) + 963 blocksize - 1) >> blocksize_bits; 964 int8_t etype = (laarr[curr].extLength >> 30); 965 966 if (blen == 1) 967 ; 968 else if (!offset || blen == offset + 1) { 969 laarr[curr + 2] = laarr[curr + 1]; 970 laarr[curr + 1] = laarr[curr]; 971 } else { 972 laarr[curr + 3] = laarr[curr + 1]; 973 laarr[curr + 2] = laarr[curr + 1] = laarr[curr]; 974 } 975 976 if (offset) { 977 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 978 udf_free_blocks(inode->i_sb, inode, 979 &laarr[curr].extLocation, 980 0, offset); 981 laarr[curr].extLength = 982 EXT_NOT_RECORDED_NOT_ALLOCATED | 983 (offset << blocksize_bits); 984 laarr[curr].extLocation.logicalBlockNum = 0; 985 laarr[curr].extLocation. 986 partitionReferenceNum = 0; 987 } else 988 laarr[curr].extLength = (etype << 30) | 989 (offset << blocksize_bits); 990 curr++; 991 (*c)++; 992 (*endnum)++; 993 } 994 995 laarr[curr].extLocation.logicalBlockNum = newblocknum; 996 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 997 laarr[curr].extLocation.partitionReferenceNum = 998 UDF_I(inode)->i_location.partitionReferenceNum; 999 laarr[curr].extLength = EXT_RECORDED_ALLOCATED | 1000 blocksize; 1001 curr++; 1002 1003 if (blen != offset + 1) { 1004 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 1005 laarr[curr].extLocation.logicalBlockNum += 1006 offset + 1; 1007 laarr[curr].extLength = (etype << 30) | 1008 ((blen - (offset + 1)) << blocksize_bits); 1009 curr++; 1010 (*endnum)++; 1011 } 1012 } 1013 } 1014 1015 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock, 1016 struct kernel_long_ad *laarr, 1017 int *endnum) 1018 { 1019 int start, length = 0, currlength = 0, i; 1020 1021 if (*endnum >= (c + 1)) { 1022 if (!lastblock) 1023 return; 1024 else 1025 start = c; 1026 } else { 1027 if ((laarr[c + 1].extLength >> 30) == 1028 (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 1029 start = c + 1; 1030 length = currlength = 1031 (((laarr[c + 1].extLength & 1032 UDF_EXTENT_LENGTH_MASK) + 1033 inode->i_sb->s_blocksize - 1) >> 1034 inode->i_sb->s_blocksize_bits); 1035 } else 1036 start = c; 1037 } 1038 1039 for (i = start + 1; i <= *endnum; i++) { 1040 if (i == *endnum) { 1041 if (lastblock) 1042 length += UDF_DEFAULT_PREALLOC_BLOCKS; 1043 } else if ((laarr[i].extLength >> 30) == 1044 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 1045 length += (((laarr[i].extLength & 1046 UDF_EXTENT_LENGTH_MASK) + 1047 inode->i_sb->s_blocksize - 1) >> 1048 inode->i_sb->s_blocksize_bits); 1049 } else 1050 break; 1051 } 1052 1053 if (length) { 1054 int next = laarr[start].extLocation.logicalBlockNum + 1055 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) + 1056 inode->i_sb->s_blocksize - 1) >> 1057 inode->i_sb->s_blocksize_bits); 1058 int numalloc = udf_prealloc_blocks(inode->i_sb, inode, 1059 laarr[start].extLocation.partitionReferenceNum, 1060 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? 1061 length : UDF_DEFAULT_PREALLOC_BLOCKS) - 1062 currlength); 1063 if (numalloc) { 1064 if (start == (c + 1)) 1065 laarr[start].extLength += 1066 (numalloc << 1067 inode->i_sb->s_blocksize_bits); 1068 else { 1069 memmove(&laarr[c + 2], &laarr[c + 1], 1070 sizeof(struct long_ad) * (*endnum - (c + 1))); 1071 (*endnum)++; 1072 laarr[c + 1].extLocation.logicalBlockNum = next; 1073 laarr[c + 1].extLocation.partitionReferenceNum = 1074 laarr[c].extLocation. 1075 partitionReferenceNum; 1076 laarr[c + 1].extLength = 1077 EXT_NOT_RECORDED_ALLOCATED | 1078 (numalloc << 1079 inode->i_sb->s_blocksize_bits); 1080 start = c + 1; 1081 } 1082 1083 for (i = start + 1; numalloc && i < *endnum; i++) { 1084 int elen = ((laarr[i].extLength & 1085 UDF_EXTENT_LENGTH_MASK) + 1086 inode->i_sb->s_blocksize - 1) >> 1087 inode->i_sb->s_blocksize_bits; 1088 1089 if (elen > numalloc) { 1090 laarr[i].extLength -= 1091 (numalloc << 1092 inode->i_sb->s_blocksize_bits); 1093 numalloc = 0; 1094 } else { 1095 numalloc -= elen; 1096 if (*endnum > (i + 1)) 1097 memmove(&laarr[i], 1098 &laarr[i + 1], 1099 sizeof(struct long_ad) * 1100 (*endnum - (i + 1))); 1101 i--; 1102 (*endnum)--; 1103 } 1104 } 1105 UDF_I(inode)->i_lenExtents += 1106 numalloc << inode->i_sb->s_blocksize_bits; 1107 } 1108 } 1109 } 1110 1111 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr, 1112 int *endnum) 1113 { 1114 int i; 1115 unsigned long blocksize = inode->i_sb->s_blocksize; 1116 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 1117 1118 for (i = 0; i < (*endnum - 1); i++) { 1119 struct kernel_long_ad *li /*l[i]*/ = &laarr[i]; 1120 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1]; 1121 1122 if (((li->extLength >> 30) == (lip1->extLength >> 30)) && 1123 (((li->extLength >> 30) == 1124 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) || 1125 ((lip1->extLocation.logicalBlockNum - 1126 li->extLocation.logicalBlockNum) == 1127 (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 1128 blocksize - 1) >> blocksize_bits)))) { 1129 1130 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 1131 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + 1132 blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) { 1133 li->extLength = lip1->extLength + 1134 (((li->extLength & 1135 UDF_EXTENT_LENGTH_MASK) + 1136 blocksize - 1) & ~(blocksize - 1)); 1137 if (*endnum > (i + 2)) 1138 memmove(&laarr[i + 1], &laarr[i + 2], 1139 sizeof(struct long_ad) * 1140 (*endnum - (i + 2))); 1141 i--; 1142 (*endnum)--; 1143 } 1144 } else if (((li->extLength >> 30) == 1145 (EXT_NOT_RECORDED_ALLOCATED >> 30)) && 1146 ((lip1->extLength >> 30) == 1147 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) { 1148 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0, 1149 ((li->extLength & 1150 UDF_EXTENT_LENGTH_MASK) + 1151 blocksize - 1) >> blocksize_bits); 1152 li->extLocation.logicalBlockNum = 0; 1153 li->extLocation.partitionReferenceNum = 0; 1154 1155 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 1156 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + 1157 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { 1158 lip1->extLength = (lip1->extLength - 1159 (li->extLength & 1160 UDF_EXTENT_LENGTH_MASK) + 1161 UDF_EXTENT_LENGTH_MASK) & 1162 ~(blocksize - 1); 1163 li->extLength = (li->extLength & 1164 UDF_EXTENT_FLAG_MASK) + 1165 (UDF_EXTENT_LENGTH_MASK + 1) - 1166 blocksize; 1167 } else { 1168 li->extLength = lip1->extLength + 1169 (((li->extLength & 1170 UDF_EXTENT_LENGTH_MASK) + 1171 blocksize - 1) & ~(blocksize - 1)); 1172 if (*endnum > (i + 2)) 1173 memmove(&laarr[i + 1], &laarr[i + 2], 1174 sizeof(struct long_ad) * 1175 (*endnum - (i + 2))); 1176 i--; 1177 (*endnum)--; 1178 } 1179 } else if ((li->extLength >> 30) == 1180 (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 1181 udf_free_blocks(inode->i_sb, inode, 1182 &li->extLocation, 0, 1183 ((li->extLength & 1184 UDF_EXTENT_LENGTH_MASK) + 1185 blocksize - 1) >> blocksize_bits); 1186 li->extLocation.logicalBlockNum = 0; 1187 li->extLocation.partitionReferenceNum = 0; 1188 li->extLength = (li->extLength & 1189 UDF_EXTENT_LENGTH_MASK) | 1190 EXT_NOT_RECORDED_NOT_ALLOCATED; 1191 } 1192 } 1193 } 1194 1195 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr, 1196 int startnum, int endnum, 1197 struct extent_position *epos) 1198 { 1199 int start = 0, i; 1200 struct kernel_lb_addr tmploc; 1201 uint32_t tmplen; 1202 int8_t tmpetype; 1203 int err; 1204 1205 if (startnum > endnum) { 1206 for (i = 0; i < (startnum - endnum); i++) 1207 udf_delete_aext(inode, *epos); 1208 } else if (startnum < endnum) { 1209 for (i = 0; i < (endnum - startnum); i++) { 1210 err = udf_insert_aext(inode, *epos, 1211 laarr[i].extLocation, 1212 laarr[i].extLength); 1213 /* 1214 * If we fail here, we are likely corrupting the extent 1215 * list and leaking blocks. At least stop early to 1216 * limit the damage. 1217 */ 1218 if (err < 0) 1219 return err; 1220 err = udf_next_aext(inode, epos, &laarr[i].extLocation, 1221 &laarr[i].extLength, &tmpetype, 1); 1222 if (err < 0) 1223 return err; 1224 start++; 1225 } 1226 } 1227 1228 for (i = start; i < endnum; i++) { 1229 err = udf_next_aext(inode, epos, &tmploc, &tmplen, &tmpetype, 0); 1230 if (err < 0) 1231 return err; 1232 1233 udf_write_aext(inode, epos, &laarr[i].extLocation, 1234 laarr[i].extLength, 1); 1235 } 1236 return 0; 1237 } 1238 1239 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block, 1240 int create, int *err) 1241 { 1242 struct buffer_head *bh = NULL; 1243 struct udf_map_rq map = { 1244 .lblk = block, 1245 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0), 1246 }; 1247 1248 *err = udf_map_block(inode, &map); 1249 if (*err || !(map.oflags & UDF_BLK_MAPPED)) 1250 return NULL; 1251 1252 bh = sb_getblk(inode->i_sb, map.pblk); 1253 if (!bh) { 1254 *err = -ENOMEM; 1255 return NULL; 1256 } 1257 if (map.oflags & UDF_BLK_NEW) { 1258 lock_buffer(bh); 1259 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); 1260 set_buffer_uptodate(bh); 1261 unlock_buffer(bh); 1262 mmb_mark_buffer_dirty(bh, &UDF_I(inode)->i_metadata_bhs); 1263 return bh; 1264 } 1265 1266 if (bh_read(bh, 0) >= 0) 1267 return bh; 1268 1269 brelse(bh); 1270 *err = -EIO; 1271 return NULL; 1272 } 1273 1274 int udf_setsize(struct inode *inode, loff_t newsize) 1275 { 1276 int err = 0; 1277 struct udf_inode_info *iinfo; 1278 unsigned int bsize = i_blocksize(inode); 1279 1280 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 1281 S_ISLNK(inode->i_mode))) 1282 return -EINVAL; 1283 1284 iinfo = UDF_I(inode); 1285 if (newsize > inode->i_size) { 1286 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1287 if (bsize >= 1288 (udf_file_entry_alloc_offset(inode) + newsize)) { 1289 down_write(&iinfo->i_data_sem); 1290 iinfo->i_lenAlloc = newsize; 1291 up_write(&iinfo->i_data_sem); 1292 goto set_size; 1293 } 1294 err = udf_expand_file_adinicb(inode); 1295 if (err) 1296 return err; 1297 } 1298 err = udf_extend_file(inode, newsize); 1299 if (err) 1300 return err; 1301 set_size: 1302 truncate_setsize(inode, newsize); 1303 } else { 1304 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1305 down_write(&iinfo->i_data_sem); 1306 udf_clear_extent_cache(inode); 1307 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize, 1308 0x00, bsize - newsize - 1309 udf_file_entry_alloc_offset(inode)); 1310 iinfo->i_lenAlloc = newsize; 1311 truncate_setsize(inode, newsize); 1312 up_write(&iinfo->i_data_sem); 1313 goto update_time; 1314 } 1315 err = block_truncate_page(inode->i_mapping, newsize, 1316 udf_get_block); 1317 if (err) 1318 return err; 1319 truncate_setsize(inode, newsize); 1320 down_write(&iinfo->i_data_sem); 1321 udf_clear_extent_cache(inode); 1322 err = udf_truncate_extents(inode); 1323 up_write(&iinfo->i_data_sem); 1324 if (err) 1325 return err; 1326 } 1327 update_time: 1328 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); 1329 if (IS_SYNC(inode)) 1330 udf_sync_inode(inode); 1331 else 1332 mark_inode_dirty(inode); 1333 return err; 1334 } 1335 1336 /* 1337 * Maximum length of linked list formed by ICB hierarchy. The chosen number is 1338 * arbitrary - just that we hopefully don't limit any real use of rewritten 1339 * inode on write-once media but avoid looping for too long on corrupted media. 1340 */ 1341 #define UDF_MAX_ICB_NESTING 1024 1342 1343 static int udf_read_inode(struct inode *inode, bool hidden_inode) 1344 { 1345 struct buffer_head *bh = NULL; 1346 struct fileEntry *fe; 1347 struct extendedFileEntry *efe; 1348 uint16_t ident; 1349 struct udf_inode_info *iinfo = UDF_I(inode); 1350 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1351 struct kernel_lb_addr *iloc = &iinfo->i_location; 1352 unsigned int link_count; 1353 unsigned int indirections = 0; 1354 int bs = inode->i_sb->s_blocksize; 1355 int ret = -EIO; 1356 uint32_t uid, gid; 1357 struct timespec64 ts; 1358 1359 reread: 1360 if (iloc->partitionReferenceNum >= sbi->s_partitions) { 1361 udf_debug("partition reference: %u > logical volume partitions: %u\n", 1362 iloc->partitionReferenceNum, sbi->s_partitions); 1363 return -EIO; 1364 } 1365 1366 if (iloc->logicalBlockNum >= 1367 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) { 1368 udf_debug("block=%u, partition=%u out of range\n", 1369 iloc->logicalBlockNum, iloc->partitionReferenceNum); 1370 return -EIO; 1371 } 1372 1373 /* 1374 * Set defaults, but the inode is still incomplete! 1375 * Note: get_new_inode() sets the following on a new inode: 1376 * i_sb = sb 1377 * i_no = ino 1378 * i_flags = sb->s_flags 1379 * i_state = 0 1380 * clean_inode(): zero fills and sets 1381 * i_count = 1 1382 * i_nlink = 1 1383 * i_op = NULL; 1384 */ 1385 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident); 1386 if (!bh) { 1387 udf_err(inode->i_sb, "(ino %llu) failed !bh\n", inode->i_ino); 1388 return -EIO; 1389 } 1390 1391 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE && 1392 ident != TAG_IDENT_USE) { 1393 udf_err(inode->i_sb, "(ino %llu) failed ident=%u\n", 1394 inode->i_ino, ident); 1395 goto out; 1396 } 1397 1398 fe = (struct fileEntry *)bh->b_data; 1399 efe = (struct extendedFileEntry *)bh->b_data; 1400 1401 if (fe->icbTag.strategyType == cpu_to_le16(4096)) { 1402 struct buffer_head *ibh; 1403 1404 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident); 1405 if (ident == TAG_IDENT_IE && ibh) { 1406 struct kernel_lb_addr loc; 1407 struct indirectEntry *ie; 1408 1409 ie = (struct indirectEntry *)ibh->b_data; 1410 loc = lelb_to_cpu(ie->indirectICB.extLocation); 1411 1412 if (ie->indirectICB.extLength) { 1413 brelse(ibh); 1414 memcpy(&iinfo->i_location, &loc, 1415 sizeof(struct kernel_lb_addr)); 1416 if (++indirections > UDF_MAX_ICB_NESTING) { 1417 udf_err(inode->i_sb, 1418 "too many ICBs in ICB hierarchy" 1419 " (max %d supported)\n", 1420 UDF_MAX_ICB_NESTING); 1421 goto out; 1422 } 1423 brelse(bh); 1424 goto reread; 1425 } 1426 } 1427 brelse(ibh); 1428 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) { 1429 udf_err(inode->i_sb, "unsupported strategy type: %u\n", 1430 le16_to_cpu(fe->icbTag.strategyType)); 1431 goto out; 1432 } 1433 if (fe->icbTag.strategyType == cpu_to_le16(4)) 1434 iinfo->i_strat4096 = 0; 1435 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */ 1436 iinfo->i_strat4096 = 1; 1437 1438 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) & 1439 ICBTAG_FLAG_AD_MASK; 1440 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT && 1441 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG && 1442 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1443 ret = -EIO; 1444 goto out; 1445 } 1446 iinfo->i_hidden = hidden_inode; 1447 iinfo->i_unique = 0; 1448 iinfo->i_lenEAttr = 0; 1449 iinfo->i_lenExtents = 0; 1450 iinfo->i_lenAlloc = 0; 1451 iinfo->i_next_alloc_block = 0; 1452 iinfo->i_next_alloc_goal = 0; 1453 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) { 1454 iinfo->i_efe = 1; 1455 iinfo->i_use = 0; 1456 ret = udf_alloc_i_data(inode, bs - 1457 sizeof(struct extendedFileEntry)); 1458 if (ret) 1459 goto out; 1460 memcpy(iinfo->i_data, 1461 bh->b_data + sizeof(struct extendedFileEntry), 1462 bs - sizeof(struct extendedFileEntry)); 1463 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) { 1464 iinfo->i_efe = 0; 1465 iinfo->i_use = 0; 1466 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry)); 1467 if (ret) 1468 goto out; 1469 memcpy(iinfo->i_data, 1470 bh->b_data + sizeof(struct fileEntry), 1471 bs - sizeof(struct fileEntry)); 1472 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) { 1473 iinfo->i_efe = 0; 1474 iinfo->i_use = 1; 1475 iinfo->i_lenAlloc = le32_to_cpu( 1476 ((struct unallocSpaceEntry *)bh->b_data)-> 1477 lengthAllocDescs); 1478 ret = udf_alloc_i_data(inode, bs - 1479 sizeof(struct unallocSpaceEntry)); 1480 if (ret) 1481 goto out; 1482 memcpy(iinfo->i_data, 1483 bh->b_data + sizeof(struct unallocSpaceEntry), 1484 bs - sizeof(struct unallocSpaceEntry)); 1485 return 0; 1486 } 1487 1488 ret = -EIO; 1489 read_lock(&sbi->s_cred_lock); 1490 uid = le32_to_cpu(fe->uid); 1491 if (uid == UDF_INVALID_ID || 1492 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET)) 1493 inode->i_uid = sbi->s_uid; 1494 else 1495 i_uid_write(inode, uid); 1496 1497 gid = le32_to_cpu(fe->gid); 1498 if (gid == UDF_INVALID_ID || 1499 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET)) 1500 inode->i_gid = sbi->s_gid; 1501 else 1502 i_gid_write(inode, gid); 1503 1504 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY && 1505 sbi->s_fmode != UDF_INVALID_MODE) 1506 inode->i_mode = sbi->s_fmode; 1507 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY && 1508 sbi->s_dmode != UDF_INVALID_MODE) 1509 inode->i_mode = sbi->s_dmode; 1510 else 1511 inode->i_mode = udf_convert_permissions(fe); 1512 inode->i_mode &= ~sbi->s_umask; 1513 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS; 1514 1515 read_unlock(&sbi->s_cred_lock); 1516 1517 link_count = le16_to_cpu(fe->fileLinkCount); 1518 if (!link_count) { 1519 if (!hidden_inode) { 1520 ret = -ESTALE; 1521 goto out; 1522 } 1523 link_count = 1; 1524 } 1525 set_nlink(inode, link_count); 1526 1527 inode->i_size = le64_to_cpu(fe->informationLength); 1528 iinfo->i_lenExtents = inode->i_size; 1529 1530 if (iinfo->i_efe == 0) { 1531 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) << 1532 (inode->i_sb->s_blocksize_bits - 9); 1533 1534 udf_disk_stamp_to_time(&ts, fe->accessTime); 1535 inode_set_atime_to_ts(inode, ts); 1536 udf_disk_stamp_to_time(&ts, fe->modificationTime); 1537 inode_set_mtime_to_ts(inode, ts); 1538 udf_disk_stamp_to_time(&ts, fe->attrTime); 1539 inode_set_ctime_to_ts(inode, ts); 1540 1541 iinfo->i_unique = le64_to_cpu(fe->uniqueID); 1542 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr); 1543 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs); 1544 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint); 1545 iinfo->i_streamdir = 0; 1546 iinfo->i_lenStreams = 0; 1547 } else { 1548 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << 1549 (inode->i_sb->s_blocksize_bits - 9); 1550 1551 udf_disk_stamp_to_time(&ts, efe->accessTime); 1552 inode_set_atime_to_ts(inode, ts); 1553 udf_disk_stamp_to_time(&ts, efe->modificationTime); 1554 inode_set_mtime_to_ts(inode, ts); 1555 udf_disk_stamp_to_time(&ts, efe->attrTime); 1556 inode_set_ctime_to_ts(inode, ts); 1557 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime); 1558 1559 iinfo->i_unique = le64_to_cpu(efe->uniqueID); 1560 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr); 1561 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs); 1562 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); 1563 1564 /* Named streams */ 1565 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0); 1566 iinfo->i_locStreamdir = 1567 lelb_to_cpu(efe->streamDirectoryICB.extLocation); 1568 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize); 1569 if (iinfo->i_lenStreams >= inode->i_size) 1570 iinfo->i_lenStreams -= inode->i_size; 1571 else 1572 iinfo->i_lenStreams = 0; 1573 } 1574 inode->i_generation = iinfo->i_unique; 1575 1576 /* 1577 * Sanity check length of allocation descriptors and extended attrs to 1578 * avoid integer overflows 1579 */ 1580 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs) 1581 goto out; 1582 /* Now do exact checks */ 1583 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs) 1584 goto out; 1585 /* Sanity checks for files in ICB so that we don't get confused later */ 1586 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1587 /* 1588 * For file in ICB data is stored in allocation descriptor 1589 * so sizes should match 1590 */ 1591 if (iinfo->i_lenAlloc != inode->i_size) 1592 goto out; 1593 /* File in ICB has to fit in there... */ 1594 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode)) 1595 goto out; 1596 } 1597 1598 switch (fe->icbTag.fileType) { 1599 case ICBTAG_FILE_TYPE_DIRECTORY: 1600 inode->i_op = &udf_dir_inode_operations; 1601 inode->i_fop = &udf_dir_operations; 1602 inode->i_mode |= S_IFDIR; 1603 inc_nlink(inode); 1604 break; 1605 case ICBTAG_FILE_TYPE_REALTIME: 1606 case ICBTAG_FILE_TYPE_REGULAR: 1607 case ICBTAG_FILE_TYPE_UNDEF: 1608 case ICBTAG_FILE_TYPE_VAT20: 1609 inode->i_data.a_ops = &udf_aops; 1610 inode->i_op = &udf_file_inode_operations; 1611 inode->i_fop = &udf_file_operations; 1612 inode->i_mode |= S_IFREG; 1613 break; 1614 case ICBTAG_FILE_TYPE_BLOCK: 1615 inode->i_mode |= S_IFBLK; 1616 break; 1617 case ICBTAG_FILE_TYPE_CHAR: 1618 inode->i_mode |= S_IFCHR; 1619 break; 1620 case ICBTAG_FILE_TYPE_FIFO: 1621 init_special_inode(inode, inode->i_mode | S_IFIFO, 0); 1622 break; 1623 case ICBTAG_FILE_TYPE_SOCKET: 1624 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0); 1625 break; 1626 case ICBTAG_FILE_TYPE_SYMLINK: 1627 inode->i_data.a_ops = &udf_symlink_aops; 1628 inode->i_op = &udf_symlink_inode_operations; 1629 inode_nohighmem(inode); 1630 inode->i_mode = S_IFLNK | 0777; 1631 break; 1632 case ICBTAG_FILE_TYPE_MAIN: 1633 udf_debug("METADATA FILE-----\n"); 1634 break; 1635 case ICBTAG_FILE_TYPE_MIRROR: 1636 udf_debug("METADATA MIRROR FILE-----\n"); 1637 break; 1638 case ICBTAG_FILE_TYPE_BITMAP: 1639 udf_debug("METADATA BITMAP FILE-----\n"); 1640 break; 1641 default: 1642 udf_err(inode->i_sb, "(ino %llu) failed unknown file type=%u\n", 1643 inode->i_ino, fe->icbTag.fileType); 1644 goto out; 1645 } 1646 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1647 struct deviceSpec *dsea = 1648 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1649 if (dsea) { 1650 init_special_inode(inode, inode->i_mode, 1651 MKDEV(le32_to_cpu(dsea->majorDeviceIdent), 1652 le32_to_cpu(dsea->minorDeviceIdent))); 1653 /* Developer ID ??? */ 1654 } else 1655 goto out; 1656 } 1657 ret = 0; 1658 out: 1659 brelse(bh); 1660 return ret; 1661 } 1662 1663 static int udf_alloc_i_data(struct inode *inode, size_t size) 1664 { 1665 struct udf_inode_info *iinfo = UDF_I(inode); 1666 iinfo->i_data = kmalloc(size, GFP_KERNEL); 1667 if (!iinfo->i_data) 1668 return -ENOMEM; 1669 return 0; 1670 } 1671 1672 static umode_t udf_convert_permissions(struct fileEntry *fe) 1673 { 1674 umode_t mode; 1675 uint32_t permissions; 1676 uint32_t flags; 1677 1678 permissions = le32_to_cpu(fe->permissions); 1679 flags = le16_to_cpu(fe->icbTag.flags); 1680 1681 mode = ((permissions) & 0007) | 1682 ((permissions >> 2) & 0070) | 1683 ((permissions >> 4) & 0700) | 1684 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) | 1685 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) | 1686 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0); 1687 1688 return mode; 1689 } 1690 1691 void udf_update_extra_perms(struct inode *inode, umode_t mode) 1692 { 1693 struct udf_inode_info *iinfo = UDF_I(inode); 1694 1695 /* 1696 * UDF 2.01 sec. 3.3.3.3 Note 2: 1697 * In Unix, delete permission tracks write 1698 */ 1699 iinfo->i_extraPerms &= ~FE_DELETE_PERMS; 1700 if (mode & 0200) 1701 iinfo->i_extraPerms |= FE_PERM_U_DELETE; 1702 if (mode & 0020) 1703 iinfo->i_extraPerms |= FE_PERM_G_DELETE; 1704 if (mode & 0002) 1705 iinfo->i_extraPerms |= FE_PERM_O_DELETE; 1706 } 1707 1708 int udf_write_inode(struct inode *inode, struct writeback_control *wbc) 1709 { 1710 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1711 } 1712 1713 static int udf_sync_inode(struct inode *inode) 1714 { 1715 return udf_update_inode(inode, 1); 1716 } 1717 1718 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time) 1719 { 1720 if (iinfo->i_crtime.tv_sec > time.tv_sec || 1721 (iinfo->i_crtime.tv_sec == time.tv_sec && 1722 iinfo->i_crtime.tv_nsec > time.tv_nsec)) 1723 iinfo->i_crtime = time; 1724 } 1725 1726 static int udf_update_inode(struct inode *inode, int do_sync) 1727 { 1728 struct buffer_head *bh = NULL; 1729 struct fileEntry *fe; 1730 struct extendedFileEntry *efe; 1731 uint64_t lb_recorded; 1732 uint32_t udfperms; 1733 uint16_t icbflags; 1734 uint16_t crclen; 1735 int err = 0; 1736 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1737 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 1738 struct udf_inode_info *iinfo = UDF_I(inode); 1739 1740 bh = sb_getblk(inode->i_sb, 1741 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0)); 1742 if (!bh) { 1743 udf_debug("getblk failure\n"); 1744 return -EIO; 1745 } 1746 1747 lock_buffer(bh); 1748 memset(bh->b_data, 0, inode->i_sb->s_blocksize); 1749 fe = (struct fileEntry *)bh->b_data; 1750 efe = (struct extendedFileEntry *)bh->b_data; 1751 1752 if (iinfo->i_use) { 1753 struct unallocSpaceEntry *use = 1754 (struct unallocSpaceEntry *)bh->b_data; 1755 1756 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1757 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), 1758 iinfo->i_data, inode->i_sb->s_blocksize - 1759 sizeof(struct unallocSpaceEntry)); 1760 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE); 1761 crclen = sizeof(struct unallocSpaceEntry); 1762 1763 goto finish; 1764 } 1765 1766 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET)) 1767 fe->uid = cpu_to_le32(UDF_INVALID_ID); 1768 else 1769 fe->uid = cpu_to_le32(i_uid_read(inode)); 1770 1771 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET)) 1772 fe->gid = cpu_to_le32(UDF_INVALID_ID); 1773 else 1774 fe->gid = cpu_to_le32(i_gid_read(inode)); 1775 1776 udfperms = ((inode->i_mode & 0007)) | 1777 ((inode->i_mode & 0070) << 2) | 1778 ((inode->i_mode & 0700) << 4); 1779 1780 udfperms |= iinfo->i_extraPerms; 1781 fe->permissions = cpu_to_le32(udfperms); 1782 1783 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0) 1784 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1); 1785 else { 1786 if (iinfo->i_hidden) 1787 fe->fileLinkCount = cpu_to_le16(0); 1788 else 1789 fe->fileLinkCount = cpu_to_le16(inode->i_nlink); 1790 } 1791 1792 fe->informationLength = cpu_to_le64(inode->i_size); 1793 1794 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1795 struct regid *eid; 1796 struct deviceSpec *dsea = 1797 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1798 if (!dsea) { 1799 dsea = (struct deviceSpec *) 1800 udf_add_extendedattr(inode, 1801 sizeof(struct deviceSpec) + 1802 sizeof(struct regid), 12, 0x3); 1803 dsea->attrType = cpu_to_le32(12); 1804 dsea->attrSubtype = 1; 1805 dsea->attrLength = cpu_to_le32( 1806 sizeof(struct deviceSpec) + 1807 sizeof(struct regid)); 1808 dsea->impUseLength = cpu_to_le32(sizeof(struct regid)); 1809 } 1810 eid = (struct regid *)dsea->impUse; 1811 memset(eid, 0, sizeof(*eid)); 1812 strcpy(eid->ident, UDF_ID_DEVELOPER); 1813 eid->identSuffix[0] = UDF_OS_CLASS_UNIX; 1814 eid->identSuffix[1] = UDF_OS_ID_LINUX; 1815 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode)); 1816 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode)); 1817 } 1818 1819 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1820 lb_recorded = 0; /* No extents => no blocks! */ 1821 else 1822 lb_recorded = 1823 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >> 1824 (blocksize_bits - 9); 1825 1826 if (iinfo->i_efe == 0) { 1827 memcpy(bh->b_data + sizeof(struct fileEntry), 1828 iinfo->i_data, 1829 inode->i_sb->s_blocksize - sizeof(struct fileEntry)); 1830 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); 1831 1832 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode)); 1833 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode)); 1834 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode)); 1835 memset(&(fe->impIdent), 0, sizeof(struct regid)); 1836 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER); 1837 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1838 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1839 fe->uniqueID = cpu_to_le64(iinfo->i_unique); 1840 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); 1841 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1842 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint); 1843 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE); 1844 crclen = sizeof(struct fileEntry); 1845 } else { 1846 memcpy(bh->b_data + sizeof(struct extendedFileEntry), 1847 iinfo->i_data, 1848 inode->i_sb->s_blocksize - 1849 sizeof(struct extendedFileEntry)); 1850 efe->objectSize = 1851 cpu_to_le64(inode->i_size + iinfo->i_lenStreams); 1852 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); 1853 1854 if (iinfo->i_streamdir) { 1855 struct long_ad *icb_lad = &efe->streamDirectoryICB; 1856 1857 icb_lad->extLocation = 1858 cpu_to_lelb(iinfo->i_locStreamdir); 1859 icb_lad->extLength = 1860 cpu_to_le32(inode->i_sb->s_blocksize); 1861 } 1862 1863 udf_adjust_time(iinfo, inode_get_atime(inode)); 1864 udf_adjust_time(iinfo, inode_get_mtime(inode)); 1865 udf_adjust_time(iinfo, inode_get_ctime(inode)); 1866 1867 udf_time_to_disk_stamp(&efe->accessTime, 1868 inode_get_atime(inode)); 1869 udf_time_to_disk_stamp(&efe->modificationTime, 1870 inode_get_mtime(inode)); 1871 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime); 1872 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode)); 1873 1874 memset(&(efe->impIdent), 0, sizeof(efe->impIdent)); 1875 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER); 1876 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1877 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1878 efe->uniqueID = cpu_to_le64(iinfo->i_unique); 1879 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); 1880 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1881 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint); 1882 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE); 1883 crclen = sizeof(struct extendedFileEntry); 1884 } 1885 1886 finish: 1887 if (iinfo->i_strat4096) { 1888 fe->icbTag.strategyType = cpu_to_le16(4096); 1889 fe->icbTag.strategyParameter = cpu_to_le16(1); 1890 fe->icbTag.numEntries = cpu_to_le16(2); 1891 } else { 1892 fe->icbTag.strategyType = cpu_to_le16(4); 1893 fe->icbTag.numEntries = cpu_to_le16(1); 1894 } 1895 1896 if (iinfo->i_use) 1897 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE; 1898 else if (S_ISDIR(inode->i_mode)) 1899 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY; 1900 else if (S_ISREG(inode->i_mode)) 1901 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR; 1902 else if (S_ISLNK(inode->i_mode)) 1903 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK; 1904 else if (S_ISBLK(inode->i_mode)) 1905 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK; 1906 else if (S_ISCHR(inode->i_mode)) 1907 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR; 1908 else if (S_ISFIFO(inode->i_mode)) 1909 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO; 1910 else if (S_ISSOCK(inode->i_mode)) 1911 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET; 1912 1913 icbflags = iinfo->i_alloc_type | 1914 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) | 1915 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) | 1916 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) | 1917 (le16_to_cpu(fe->icbTag.flags) & 1918 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID | 1919 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY)); 1920 1921 fe->icbTag.flags = cpu_to_le16(icbflags); 1922 if (sbi->s_udfrev >= 0x0200) 1923 fe->descTag.descVersion = cpu_to_le16(3); 1924 else 1925 fe->descTag.descVersion = cpu_to_le16(2); 1926 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number); 1927 fe->descTag.tagLocation = cpu_to_le32( 1928 iinfo->i_location.logicalBlockNum); 1929 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag); 1930 fe->descTag.descCRCLength = cpu_to_le16(crclen); 1931 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag), 1932 crclen)); 1933 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag); 1934 1935 set_buffer_uptodate(bh); 1936 unlock_buffer(bh); 1937 1938 /* write the data blocks */ 1939 mark_buffer_dirty(bh); 1940 if (do_sync) { 1941 sync_dirty_buffer(bh); 1942 if (buffer_write_io_error(bh)) { 1943 udf_warn(inode->i_sb, "IO error syncing udf inode [%08llx]\n", 1944 inode->i_ino); 1945 err = -EIO; 1946 } 1947 } 1948 brelse(bh); 1949 1950 return err; 1951 } 1952 1953 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino, 1954 bool hidden_inode) 1955 { 1956 unsigned long block = udf_get_lb_pblock(sb, ino, 0); 1957 struct inode *inode = iget_locked(sb, block); 1958 int err; 1959 1960 if (!inode) 1961 return ERR_PTR(-ENOMEM); 1962 1963 if (!(inode_state_read_once(inode) & I_NEW)) { 1964 if (UDF_I(inode)->i_hidden != hidden_inode) { 1965 iput(inode); 1966 return ERR_PTR(-EFSCORRUPTED); 1967 } 1968 return inode; 1969 } 1970 1971 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr)); 1972 err = udf_read_inode(inode, hidden_inode); 1973 if (err < 0) { 1974 iget_failed(inode); 1975 return ERR_PTR(err); 1976 } 1977 unlock_new_inode(inode); 1978 1979 return inode; 1980 } 1981 1982 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block, 1983 struct extent_position *epos) 1984 { 1985 struct super_block *sb = inode->i_sb; 1986 struct buffer_head *bh; 1987 struct allocExtDesc *aed; 1988 struct extent_position nepos; 1989 struct kernel_lb_addr neloc; 1990 int ver, adsize; 1991 int err = 0; 1992 1993 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 1994 adsize = sizeof(struct short_ad); 1995 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG) 1996 adsize = sizeof(struct long_ad); 1997 else 1998 return -EIO; 1999 2000 neloc.logicalBlockNum = block; 2001 neloc.partitionReferenceNum = epos->block.partitionReferenceNum; 2002 2003 bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0)); 2004 if (!bh) 2005 return -EIO; 2006 lock_buffer(bh); 2007 memset(bh->b_data, 0x00, sb->s_blocksize); 2008 set_buffer_uptodate(bh); 2009 unlock_buffer(bh); 2010 mmb_mark_buffer_dirty(bh, &UDF_I(inode)->i_metadata_bhs); 2011 2012 aed = (struct allocExtDesc *)(bh->b_data); 2013 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) { 2014 aed->previousAllocExtLocation = 2015 cpu_to_le32(epos->block.logicalBlockNum); 2016 } 2017 aed->lengthAllocDescs = cpu_to_le32(0); 2018 if (UDF_SB(sb)->s_udfrev >= 0x0200) 2019 ver = 3; 2020 else 2021 ver = 2; 2022 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block, 2023 sizeof(struct tag)); 2024 2025 nepos.block = neloc; 2026 nepos.offset = sizeof(struct allocExtDesc); 2027 nepos.bh = bh; 2028 2029 /* 2030 * Do we have to copy current last extent to make space for indirect 2031 * one? 2032 */ 2033 if (epos->offset + adsize > sb->s_blocksize) { 2034 struct kernel_lb_addr cp_loc; 2035 uint32_t cp_len; 2036 int8_t cp_type; 2037 2038 epos->offset -= adsize; 2039 err = udf_current_aext(inode, epos, &cp_loc, &cp_len, &cp_type, 0); 2040 if (err <= 0) 2041 goto err_out; 2042 cp_len |= ((uint32_t)cp_type) << 30; 2043 2044 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1); 2045 udf_write_aext(inode, epos, &nepos.block, 2046 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0); 2047 } else { 2048 __udf_add_aext(inode, epos, &nepos.block, 2049 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0); 2050 } 2051 2052 brelse(epos->bh); 2053 *epos = nepos; 2054 2055 return 0; 2056 err_out: 2057 brelse(bh); 2058 return err; 2059 } 2060 2061 /* 2062 * Append extent at the given position - should be the first free one in inode 2063 * / indirect extent. This function assumes there is enough space in the inode 2064 * or indirect extent. Use udf_add_aext() if you didn't check for this before. 2065 */ 2066 int __udf_add_aext(struct inode *inode, struct extent_position *epos, 2067 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 2068 { 2069 struct udf_inode_info *iinfo = UDF_I(inode); 2070 struct allocExtDesc *aed; 2071 int adsize; 2072 2073 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2074 adsize = sizeof(struct short_ad); 2075 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2076 adsize = sizeof(struct long_ad); 2077 else 2078 return -EIO; 2079 2080 if (!epos->bh) { 2081 WARN_ON(iinfo->i_lenAlloc != 2082 epos->offset - udf_file_entry_alloc_offset(inode)); 2083 } else { 2084 aed = (struct allocExtDesc *)epos->bh->b_data; 2085 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) != 2086 epos->offset - sizeof(struct allocExtDesc)); 2087 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize); 2088 } 2089 2090 udf_write_aext(inode, epos, eloc, elen, inc); 2091 2092 if (!epos->bh) { 2093 iinfo->i_lenAlloc += adsize; 2094 mark_inode_dirty(inode); 2095 } else { 2096 aed = (struct allocExtDesc *)epos->bh->b_data; 2097 le32_add_cpu(&aed->lengthAllocDescs, adsize); 2098 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2099 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2100 udf_update_tag(epos->bh->b_data, 2101 epos->offset + (inc ? 0 : adsize)); 2102 else 2103 udf_update_tag(epos->bh->b_data, 2104 sizeof(struct allocExtDesc)); 2105 mmb_mark_buffer_dirty(epos->bh, &iinfo->i_metadata_bhs); 2106 } 2107 2108 return 0; 2109 } 2110 2111 /* 2112 * Append extent at given position - should be the first free one in inode 2113 * / indirect extent. Takes care of allocating and linking indirect blocks. 2114 */ 2115 int udf_add_aext(struct inode *inode, struct extent_position *epos, 2116 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 2117 { 2118 int adsize; 2119 struct super_block *sb = inode->i_sb; 2120 2121 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2122 adsize = sizeof(struct short_ad); 2123 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2124 adsize = sizeof(struct long_ad); 2125 else 2126 return -EIO; 2127 2128 if (epos->offset + (2 * adsize) > sb->s_blocksize) { 2129 int err; 2130 udf_pblk_t new_block; 2131 2132 new_block = udf_new_block(sb, NULL, 2133 epos->block.partitionReferenceNum, 2134 epos->block.logicalBlockNum, &err); 2135 if (!new_block) 2136 return -ENOSPC; 2137 2138 err = udf_setup_indirect_aext(inode, new_block, epos); 2139 if (err) 2140 return err; 2141 } 2142 2143 return __udf_add_aext(inode, epos, eloc, elen, inc); 2144 } 2145 2146 void udf_write_aext(struct inode *inode, struct extent_position *epos, 2147 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 2148 { 2149 int adsize; 2150 uint8_t *ptr; 2151 struct short_ad *sad; 2152 struct long_ad *lad; 2153 struct udf_inode_info *iinfo = UDF_I(inode); 2154 2155 if (!epos->bh) 2156 ptr = iinfo->i_data + epos->offset - 2157 udf_file_entry_alloc_offset(inode) + 2158 iinfo->i_lenEAttr; 2159 else 2160 ptr = epos->bh->b_data + epos->offset; 2161 2162 switch (iinfo->i_alloc_type) { 2163 case ICBTAG_FLAG_AD_SHORT: 2164 sad = (struct short_ad *)ptr; 2165 sad->extLength = cpu_to_le32(elen); 2166 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum); 2167 adsize = sizeof(struct short_ad); 2168 break; 2169 case ICBTAG_FLAG_AD_LONG: 2170 lad = (struct long_ad *)ptr; 2171 lad->extLength = cpu_to_le32(elen); 2172 lad->extLocation = cpu_to_lelb(*eloc); 2173 memset(lad->impUse, 0x00, sizeof(lad->impUse)); 2174 adsize = sizeof(struct long_ad); 2175 break; 2176 default: 2177 return; 2178 } 2179 2180 if (epos->bh) { 2181 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2182 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) { 2183 struct allocExtDesc *aed = 2184 (struct allocExtDesc *)epos->bh->b_data; 2185 udf_update_tag(epos->bh->b_data, 2186 le32_to_cpu(aed->lengthAllocDescs) + 2187 sizeof(struct allocExtDesc)); 2188 } 2189 mmb_mark_buffer_dirty(epos->bh, &iinfo->i_metadata_bhs); 2190 } else { 2191 mark_inode_dirty(inode); 2192 } 2193 2194 if (inc) 2195 epos->offset += adsize; 2196 } 2197 2198 /* 2199 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case 2200 * someone does some weird stuff. 2201 */ 2202 #define UDF_MAX_INDIR_EXTS 16 2203 2204 /* 2205 * Returns 1 on success, -errno on error, 0 on hit EOF. 2206 */ 2207 int udf_next_aext(struct inode *inode, struct extent_position *epos, 2208 struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype, 2209 int inc) 2210 { 2211 unsigned int indirections = 0; 2212 int ret = 0; 2213 udf_pblk_t block; 2214 2215 while (1) { 2216 ret = udf_current_aext(inode, epos, eloc, elen, 2217 etype, inc); 2218 if (ret <= 0) 2219 return ret; 2220 if (*etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) 2221 return ret; 2222 2223 if (++indirections > UDF_MAX_INDIR_EXTS) { 2224 udf_err(inode->i_sb, 2225 "too many indirect extents in inode %llu\n", 2226 inode->i_ino); 2227 return -EFSCORRUPTED; 2228 } 2229 2230 epos->block = *eloc; 2231 epos->offset = sizeof(struct allocExtDesc); 2232 brelse(epos->bh); 2233 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0); 2234 epos->bh = sb_bread(inode->i_sb, block); 2235 if (!epos->bh) { 2236 udf_debug("reading block %u failed!\n", block); 2237 return -EIO; 2238 } 2239 } 2240 } 2241 2242 /* 2243 * Returns 1 on success, -errno on error, 0 on hit EOF. 2244 */ 2245 int udf_current_aext(struct inode *inode, struct extent_position *epos, 2246 struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype, 2247 int inc) 2248 { 2249 int alen; 2250 uint8_t *ptr; 2251 struct short_ad *sad; 2252 struct long_ad *lad; 2253 struct udf_inode_info *iinfo = UDF_I(inode); 2254 2255 if (!epos->bh) { 2256 if (!epos->offset) 2257 epos->offset = udf_file_entry_alloc_offset(inode); 2258 ptr = iinfo->i_data + epos->offset - 2259 udf_file_entry_alloc_offset(inode) + 2260 iinfo->i_lenEAttr; 2261 alen = udf_file_entry_alloc_offset(inode) + 2262 iinfo->i_lenAlloc; 2263 } else { 2264 struct allocExtDesc *header = 2265 (struct allocExtDesc *)epos->bh->b_data; 2266 2267 if (!epos->offset) 2268 epos->offset = sizeof(struct allocExtDesc); 2269 ptr = epos->bh->b_data + epos->offset; 2270 if (check_add_overflow(sizeof(struct allocExtDesc), 2271 le32_to_cpu(header->lengthAllocDescs), &alen)) 2272 return -1; 2273 2274 if (alen > epos->bh->b_size) 2275 return -1; 2276 } 2277 2278 switch (iinfo->i_alloc_type) { 2279 case ICBTAG_FLAG_AD_SHORT: 2280 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc); 2281 if (!sad) 2282 return 0; 2283 *etype = le32_to_cpu(sad->extLength) >> 30; 2284 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition); 2285 eloc->partitionReferenceNum = 2286 iinfo->i_location.partitionReferenceNum; 2287 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK; 2288 break; 2289 case ICBTAG_FLAG_AD_LONG: 2290 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc); 2291 if (!lad) 2292 return 0; 2293 *etype = le32_to_cpu(lad->extLength) >> 30; 2294 *eloc = lelb_to_cpu(lad->extLocation); 2295 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK; 2296 break; 2297 default: 2298 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type); 2299 return -EINVAL; 2300 } 2301 2302 return 1; 2303 } 2304 2305 static int udf_insert_aext(struct inode *inode, struct extent_position epos, 2306 struct kernel_lb_addr neloc, uint32_t nelen) 2307 { 2308 struct kernel_lb_addr oeloc; 2309 uint32_t oelen; 2310 int8_t etype; 2311 int ret; 2312 2313 if (epos.bh) 2314 get_bh(epos.bh); 2315 2316 while (1) { 2317 ret = udf_next_aext(inode, &epos, &oeloc, &oelen, &etype, 0); 2318 if (ret <= 0) 2319 break; 2320 udf_write_aext(inode, &epos, &neloc, nelen, 1); 2321 neloc = oeloc; 2322 nelen = (etype << 30) | oelen; 2323 } 2324 if (ret == 0) 2325 ret = udf_add_aext(inode, &epos, &neloc, nelen, 1); 2326 brelse(epos.bh); 2327 2328 return ret; 2329 } 2330 2331 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos) 2332 { 2333 struct extent_position oepos; 2334 int adsize; 2335 int8_t etype; 2336 struct allocExtDesc *aed; 2337 struct udf_inode_info *iinfo; 2338 struct kernel_lb_addr eloc; 2339 uint32_t elen; 2340 int ret; 2341 2342 if (epos.bh) { 2343 get_bh(epos.bh); 2344 get_bh(epos.bh); 2345 } 2346 2347 iinfo = UDF_I(inode); 2348 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2349 adsize = sizeof(struct short_ad); 2350 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2351 adsize = sizeof(struct long_ad); 2352 else 2353 adsize = 0; 2354 2355 oepos = epos; 2356 if (udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1) <= 0) 2357 return -1; 2358 2359 while (1) { 2360 ret = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1); 2361 if (ret < 0) { 2362 brelse(epos.bh); 2363 brelse(oepos.bh); 2364 return -1; 2365 } 2366 if (ret == 0) 2367 break; 2368 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1); 2369 if (oepos.bh != epos.bh) { 2370 oepos.block = epos.block; 2371 brelse(oepos.bh); 2372 get_bh(epos.bh); 2373 oepos.bh = epos.bh; 2374 oepos.offset = epos.offset - adsize; 2375 } 2376 } 2377 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr)); 2378 elen = 0; 2379 2380 if (epos.bh != oepos.bh) { 2381 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1); 2382 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2383 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2384 if (!oepos.bh) { 2385 iinfo->i_lenAlloc -= (adsize * 2); 2386 mark_inode_dirty(inode); 2387 } else { 2388 aed = (struct allocExtDesc *)oepos.bh->b_data; 2389 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize)); 2390 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2391 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2392 udf_update_tag(oepos.bh->b_data, 2393 oepos.offset - (2 * adsize)); 2394 else 2395 udf_update_tag(oepos.bh->b_data, 2396 sizeof(struct allocExtDesc)); 2397 mmb_mark_buffer_dirty(oepos.bh, &iinfo->i_metadata_bhs); 2398 } 2399 } else { 2400 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2401 if (!oepos.bh) { 2402 iinfo->i_lenAlloc -= adsize; 2403 mark_inode_dirty(inode); 2404 } else { 2405 aed = (struct allocExtDesc *)oepos.bh->b_data; 2406 le32_add_cpu(&aed->lengthAllocDescs, -adsize); 2407 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2408 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2409 udf_update_tag(oepos.bh->b_data, 2410 epos.offset - adsize); 2411 else 2412 udf_update_tag(oepos.bh->b_data, 2413 sizeof(struct allocExtDesc)); 2414 mmb_mark_buffer_dirty(oepos.bh, &iinfo->i_metadata_bhs); 2415 } 2416 } 2417 2418 brelse(epos.bh); 2419 brelse(oepos.bh); 2420 2421 return (elen >> 30); 2422 } 2423 2424 /* 2425 * Returns 1 on success, -errno on error, 0 on hit EOF. 2426 */ 2427 int inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos, 2428 struct kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset, 2429 int8_t *etype) 2430 { 2431 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 2432 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits; 2433 struct udf_inode_info *iinfo; 2434 int err = 0; 2435 2436 iinfo = UDF_I(inode); 2437 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) { 2438 pos->offset = 0; 2439 pos->block = iinfo->i_location; 2440 pos->bh = NULL; 2441 } 2442 *elen = 0; 2443 do { 2444 err = udf_next_aext(inode, pos, eloc, elen, etype, 1); 2445 if (err <= 0) { 2446 if (err == 0) { 2447 *offset = (bcount - lbcount) >> blocksize_bits; 2448 iinfo->i_lenExtents = lbcount; 2449 } 2450 return err; 2451 } 2452 lbcount += *elen; 2453 } while (lbcount <= bcount); 2454 /* update extent cache */ 2455 udf_update_extent_cache(inode, lbcount - *elen, pos); 2456 *offset = (bcount + *elen - lbcount) >> blocksize_bits; 2457 2458 return 1; 2459 } 2460