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