inode.c revision 6c79e987d629cb0f8f7e2983725f4434a2dec66b
1/* 2 * inode.c 3 * 4 * PURPOSE 5 * Inode handling routines for the OSTA-UDF(tm) filesystem. 6 * 7 * COPYRIGHT 8 * This file is distributed under the terms of the GNU General Public 9 * License (GPL). Copies of the GPL can be obtained from: 10 * ftp://prep.ai.mit.edu/pub/gnu/GPL 11 * Each contributing author retains all rights to their own work. 12 * 13 * (C) 1998 Dave Boynton 14 * (C) 1998-2004 Ben Fennema 15 * (C) 1999-2000 Stelias Computing Inc 16 * 17 * HISTORY 18 * 19 * 10/04/98 dgb Added rudimentary directory functions 20 * 10/07/98 Fully working udf_block_map! It works! 21 * 11/25/98 bmap altered to better support extents 22 * 12/06/98 blf partition support in udf_iget, udf_block_map and udf_read_inode 23 * 12/12/98 rewrote udf_block_map to handle next extents and descs across 24 * block boundaries (which is not actually allowed) 25 * 12/20/98 added support for strategy 4096 26 * 03/07/99 rewrote udf_block_map (again) 27 * New funcs, inode_bmap, udf_next_aext 28 * 04/19/99 Support for writing device EA's for major/minor # 29 */ 30 31#include "udfdecl.h" 32#include <linux/mm.h> 33#include <linux/smp_lock.h> 34#include <linux/module.h> 35#include <linux/pagemap.h> 36#include <linux/buffer_head.h> 37#include <linux/writeback.h> 38#include <linux/slab.h> 39 40#include "udf_i.h" 41#include "udf_sb.h" 42 43MODULE_AUTHOR("Ben Fennema"); 44MODULE_DESCRIPTION("Universal Disk Format Filesystem"); 45MODULE_LICENSE("GPL"); 46 47#define EXTENT_MERGE_SIZE 5 48 49static mode_t udf_convert_permissions(struct fileEntry *); 50static int udf_update_inode(struct inode *, int); 51static void udf_fill_inode(struct inode *, struct buffer_head *); 52static int udf_alloc_i_data(struct inode *inode, size_t size); 53static struct buffer_head *inode_getblk(struct inode *, sector_t, int *, 54 long *, int *); 55static int8_t udf_insert_aext(struct inode *, struct extent_position, 56 kernel_lb_addr, uint32_t); 57static void udf_split_extents(struct inode *, int *, int, int, 58 kernel_long_ad[EXTENT_MERGE_SIZE], int *); 59static void udf_prealloc_extents(struct inode *, int, int, 60 kernel_long_ad[EXTENT_MERGE_SIZE], int *); 61static void udf_merge_extents(struct inode *, 62 kernel_long_ad[EXTENT_MERGE_SIZE], int *); 63static void udf_update_extents(struct inode *, 64 kernel_long_ad[EXTENT_MERGE_SIZE], int, int, 65 struct extent_position *); 66static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int); 67 68/* 69 * udf_delete_inode 70 * 71 * PURPOSE 72 * Clean-up before the specified inode is destroyed. 73 * 74 * DESCRIPTION 75 * This routine is called when the kernel destroys an inode structure 76 * ie. when iput() finds i_count == 0. 77 * 78 * HISTORY 79 * July 1, 1997 - Andrew E. Mileski 80 * Written, tested, and released. 81 * 82 * Called at the last iput() if i_nlink is zero. 83 */ 84void udf_delete_inode(struct inode *inode) 85{ 86 truncate_inode_pages(&inode->i_data, 0); 87 88 if (is_bad_inode(inode)) 89 goto no_delete; 90 91 inode->i_size = 0; 92 udf_truncate(inode); 93 lock_kernel(); 94 95 udf_update_inode(inode, IS_SYNC(inode)); 96 udf_free_inode(inode); 97 98 unlock_kernel(); 99 return; 100 101no_delete: 102 clear_inode(inode); 103} 104 105/* 106 * If we are going to release inode from memory, we discard preallocation and 107 * truncate last inode extent to proper length. We could use drop_inode() but 108 * it's called under inode_lock and thus we cannot mark inode dirty there. We 109 * use clear_inode() but we have to make sure to write inode as it's not written 110 * automatically. 111 */ 112void udf_clear_inode(struct inode *inode) 113{ 114 if (!(inode->i_sb->s_flags & MS_RDONLY)) { 115 lock_kernel(); 116 /* Discard preallocation for directories, symlinks, etc. */ 117 udf_discard_prealloc(inode); 118 udf_truncate_tail_extent(inode); 119 unlock_kernel(); 120 write_inode_now(inode, 1); 121 } 122 kfree(UDF_I_DATA(inode)); 123 UDF_I_DATA(inode) = NULL; 124} 125 126static int udf_writepage(struct page *page, struct writeback_control *wbc) 127{ 128 return block_write_full_page(page, udf_get_block, wbc); 129} 130 131static int udf_readpage(struct file *file, struct page *page) 132{ 133 return block_read_full_page(page, udf_get_block); 134} 135 136static int udf_write_begin(struct file *file, struct address_space *mapping, 137 loff_t pos, unsigned len, unsigned flags, 138 struct page **pagep, void **fsdata) 139{ 140 *pagep = NULL; 141 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 142 udf_get_block); 143} 144 145static sector_t udf_bmap(struct address_space *mapping, sector_t block) 146{ 147 return generic_block_bmap(mapping, block, udf_get_block); 148} 149 150const struct address_space_operations udf_aops = { 151 .readpage = udf_readpage, 152 .writepage = udf_writepage, 153 .sync_page = block_sync_page, 154 .write_begin = udf_write_begin, 155 .write_end = generic_write_end, 156 .bmap = udf_bmap, 157}; 158 159void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err) 160{ 161 struct page *page; 162 char *kaddr; 163 struct writeback_control udf_wbc = { 164 .sync_mode = WB_SYNC_NONE, 165 .nr_to_write = 1, 166 }; 167 168 /* from now on we have normal address_space methods */ 169 inode->i_data.a_ops = &udf_aops; 170 171 if (!UDF_I_LENALLOC(inode)) { 172 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 173 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT; 174 else 175 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG; 176 mark_inode_dirty(inode); 177 return; 178 } 179 180 page = grab_cache_page(inode->i_mapping, 0); 181 BUG_ON(!PageLocked(page)); 182 183 if (!PageUptodate(page)) { 184 kaddr = kmap(page); 185 memset(kaddr + UDF_I_LENALLOC(inode), 0x00, 186 PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode)); 187 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 188 UDF_I_LENALLOC(inode)); 189 flush_dcache_page(page); 190 SetPageUptodate(page); 191 kunmap(page); 192 } 193 memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00, 194 UDF_I_LENALLOC(inode)); 195 UDF_I_LENALLOC(inode) = 0; 196 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 197 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT; 198 else 199 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG; 200 201 inode->i_data.a_ops->writepage(page, &udf_wbc); 202 page_cache_release(page); 203 204 mark_inode_dirty(inode); 205} 206 207struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block, 208 int *err) 209{ 210 int newblock; 211 struct buffer_head *dbh = NULL; 212 kernel_lb_addr eloc; 213 uint32_t elen; 214 uint8_t alloctype; 215 struct extent_position epos; 216 217 struct udf_fileident_bh sfibh, dfibh; 218 loff_t f_pos = udf_ext0_offset(inode) >> 2; 219 int size = (udf_ext0_offset(inode) + inode->i_size) >> 2; 220 struct fileIdentDesc cfi, *sfi, *dfi; 221 222 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 223 alloctype = ICBTAG_FLAG_AD_SHORT; 224 else 225 alloctype = ICBTAG_FLAG_AD_LONG; 226 227 if (!inode->i_size) { 228 UDF_I_ALLOCTYPE(inode) = alloctype; 229 mark_inode_dirty(inode); 230 return NULL; 231 } 232 233 /* alloc block, and copy data to it */ 234 *block = udf_new_block(inode->i_sb, inode, 235 UDF_I_LOCATION(inode).partitionReferenceNum, 236 UDF_I_LOCATION(inode).logicalBlockNum, err); 237 if (!(*block)) 238 return NULL; 239 newblock = udf_get_pblock(inode->i_sb, *block, 240 UDF_I_LOCATION(inode).partitionReferenceNum, 0); 241 if (!newblock) 242 return NULL; 243 dbh = udf_tgetblk(inode->i_sb, newblock); 244 if (!dbh) 245 return NULL; 246 lock_buffer(dbh); 247 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize); 248 set_buffer_uptodate(dbh); 249 unlock_buffer(dbh); 250 mark_buffer_dirty_inode(dbh, inode); 251 252 sfibh.soffset = sfibh.eoffset = (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2; 253 sfibh.sbh = sfibh.ebh = NULL; 254 dfibh.soffset = dfibh.eoffset = 0; 255 dfibh.sbh = dfibh.ebh = dbh; 256 while ((f_pos < size)) { 257 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB; 258 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL); 259 if (!sfi) { 260 brelse(dbh); 261 return NULL; 262 } 263 UDF_I_ALLOCTYPE(inode) = alloctype; 264 sfi->descTag.tagLocation = cpu_to_le32(*block); 265 dfibh.soffset = dfibh.eoffset; 266 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset); 267 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset); 268 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse, 269 sfi->fileIdent + le16_to_cpu(sfi->lengthOfImpUse))) { 270 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB; 271 brelse(dbh); 272 return NULL; 273 } 274 } 275 mark_buffer_dirty_inode(dbh, inode); 276 277 memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode)); 278 UDF_I_LENALLOC(inode) = 0; 279 eloc.logicalBlockNum = *block; 280 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum; 281 elen = inode->i_size; 282 UDF_I_LENEXTENTS(inode) = elen; 283 epos.bh = NULL; 284 epos.block = UDF_I_LOCATION(inode); 285 epos.offset = udf_file_entry_alloc_offset(inode); 286 udf_add_aext(inode, &epos, eloc, elen, 0); 287 /* UniqueID stuff */ 288 289 brelse(epos.bh); 290 mark_inode_dirty(inode); 291 return dbh; 292} 293 294static int udf_get_block(struct inode *inode, sector_t block, 295 struct buffer_head *bh_result, int create) 296{ 297 int err, new; 298 struct buffer_head *bh; 299 unsigned long phys; 300 301 if (!create) { 302 phys = udf_block_map(inode, block); 303 if (phys) 304 map_bh(bh_result, inode->i_sb, phys); 305 return 0; 306 } 307 308 err = -EIO; 309 new = 0; 310 bh = NULL; 311 312 lock_kernel(); 313 314 if (block < 0) 315 goto abort_negative; 316 317 if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1) { 318 UDF_I_NEXT_ALLOC_BLOCK(inode)++; 319 UDF_I_NEXT_ALLOC_GOAL(inode)++; 320 } 321 322 err = 0; 323 324 bh = inode_getblk(inode, block, &err, &phys, &new); 325 BUG_ON(bh); 326 if (err) 327 goto abort; 328 BUG_ON(!phys); 329 330 if (new) 331 set_buffer_new(bh_result); 332 map_bh(bh_result, inode->i_sb, phys); 333 334abort: 335 unlock_kernel(); 336 return err; 337 338abort_negative: 339 udf_warning(inode->i_sb, "udf_get_block", "block < 0"); 340 goto abort; 341} 342 343static struct buffer_head *udf_getblk(struct inode *inode, long block, 344 int create, int *err) 345{ 346 struct buffer_head *bh; 347 struct buffer_head dummy; 348 349 dummy.b_state = 0; 350 dummy.b_blocknr = -1000; 351 *err = udf_get_block(inode, block, &dummy, create); 352 if (!*err && buffer_mapped(&dummy)) { 353 bh = sb_getblk(inode->i_sb, dummy.b_blocknr); 354 if (buffer_new(&dummy)) { 355 lock_buffer(bh); 356 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); 357 set_buffer_uptodate(bh); 358 unlock_buffer(bh); 359 mark_buffer_dirty_inode(bh, inode); 360 } 361 return bh; 362 } 363 364 return NULL; 365} 366 367/* Extend the file by 'blocks' blocks, return the number of extents added */ 368int udf_extend_file(struct inode *inode, struct extent_position *last_pos, 369 kernel_long_ad * last_ext, sector_t blocks) 370{ 371 sector_t add; 372 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 373 struct super_block *sb = inode->i_sb; 374 kernel_lb_addr prealloc_loc = {}; 375 int prealloc_len = 0; 376 377 /* The previous extent is fake and we should not extend by anything 378 * - there's nothing to do... */ 379 if (!blocks && fake) 380 return 0; 381 382 /* Round the last extent up to a multiple of block size */ 383 if (last_ext->extLength & (sb->s_blocksize - 1)) { 384 last_ext->extLength = 385 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) | 386 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) + 387 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); 388 UDF_I_LENEXTENTS(inode) = 389 (UDF_I_LENEXTENTS(inode) + sb->s_blocksize - 1) & 390 ~(sb->s_blocksize - 1); 391 } 392 393 /* Last extent are just preallocated blocks? */ 394 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_ALLOCATED) { 395 /* Save the extent so that we can reattach it to the end */ 396 prealloc_loc = last_ext->extLocation; 397 prealloc_len = last_ext->extLength; 398 /* Mark the extent as a hole */ 399 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 400 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 401 last_ext->extLocation.logicalBlockNum = 0; 402 last_ext->extLocation.partitionReferenceNum = 0; 403 } 404 405 /* Can we merge with the previous extent? */ 406 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_NOT_ALLOCATED) { 407 add = ((1 << 30) - sb->s_blocksize - (last_ext->extLength & 408 UDF_EXTENT_LENGTH_MASK)) >> sb->s_blocksize_bits; 409 if (add > blocks) 410 add = blocks; 411 blocks -= add; 412 last_ext->extLength += add << sb->s_blocksize_bits; 413 } 414 415 if (fake) { 416 udf_add_aext(inode, last_pos, last_ext->extLocation, 417 last_ext->extLength, 1); 418 count++; 419 } else { 420 udf_write_aext(inode, last_pos, last_ext->extLocation, last_ext->extLength, 1); 421 } 422 423 /* Managed to do everything necessary? */ 424 if (!blocks) 425 goto out; 426 427 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */ 428 last_ext->extLocation.logicalBlockNum = 0; 429 last_ext->extLocation.partitionReferenceNum = 0; 430 add = (1 << (30-sb->s_blocksize_bits)) - 1; 431 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | (add << sb->s_blocksize_bits); 432 433 /* Create enough extents to cover the whole hole */ 434 while (blocks > add) { 435 blocks -= add; 436 if (udf_add_aext(inode, last_pos, last_ext->extLocation, 437 last_ext->extLength, 1) == -1) 438 return -1; 439 count++; 440 } 441 if (blocks) { 442 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 443 (blocks << sb->s_blocksize_bits); 444 if (udf_add_aext(inode, last_pos, last_ext->extLocation, 445 last_ext->extLength, 1) == -1) 446 return -1; 447 count++; 448 } 449 450out: 451 /* Do we have some preallocated blocks saved? */ 452 if (prealloc_len) { 453 if (udf_add_aext(inode, last_pos, prealloc_loc, prealloc_len, 1) == -1) 454 return -1; 455 last_ext->extLocation = prealloc_loc; 456 last_ext->extLength = prealloc_len; 457 count++; 458 } 459 460 /* last_pos should point to the last written extent... */ 461 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT) 462 last_pos->offset -= sizeof(short_ad); 463 else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG) 464 last_pos->offset -= sizeof(long_ad); 465 else 466 return -1; 467 468 return count; 469} 470 471static struct buffer_head *inode_getblk(struct inode *inode, sector_t block, 472 int *err, long *phys, int *new) 473{ 474 static sector_t last_block; 475 struct buffer_head *result = NULL; 476 kernel_long_ad laarr[EXTENT_MERGE_SIZE]; 477 struct extent_position prev_epos, cur_epos, next_epos; 478 int count = 0, startnum = 0, endnum = 0; 479 uint32_t elen = 0, tmpelen; 480 kernel_lb_addr eloc, tmpeloc; 481 int c = 1; 482 loff_t lbcount = 0, b_off = 0; 483 uint32_t newblocknum, newblock; 484 sector_t offset = 0; 485 int8_t etype; 486 int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum; 487 int lastblock = 0; 488 489 prev_epos.offset = udf_file_entry_alloc_offset(inode); 490 prev_epos.block = UDF_I_LOCATION(inode); 491 prev_epos.bh = NULL; 492 cur_epos = next_epos = prev_epos; 493 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits; 494 495 /* find the extent which contains the block we are looking for. 496 alternate between laarr[0] and laarr[1] for locations of the 497 current extent, and the previous extent */ 498 do { 499 if (prev_epos.bh != cur_epos.bh) { 500 brelse(prev_epos.bh); 501 get_bh(cur_epos.bh); 502 prev_epos.bh = cur_epos.bh; 503 } 504 if (cur_epos.bh != next_epos.bh) { 505 brelse(cur_epos.bh); 506 get_bh(next_epos.bh); 507 cur_epos.bh = next_epos.bh; 508 } 509 510 lbcount += elen; 511 512 prev_epos.block = cur_epos.block; 513 cur_epos.block = next_epos.block; 514 515 prev_epos.offset = cur_epos.offset; 516 cur_epos.offset = next_epos.offset; 517 518 if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1)) == -1) 519 break; 520 521 c = !c; 522 523 laarr[c].extLength = (etype << 30) | elen; 524 laarr[c].extLocation = eloc; 525 526 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 527 pgoal = eloc.logicalBlockNum + 528 ((elen + inode->i_sb->s_blocksize - 1) >> 529 inode->i_sb->s_blocksize_bits); 530 531 count++; 532 } while (lbcount + elen <= b_off); 533 534 b_off -= lbcount; 535 offset = b_off >> inode->i_sb->s_blocksize_bits; 536 /* 537 * Move prev_epos and cur_epos into indirect extent if we are at 538 * the pointer to it 539 */ 540 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0); 541 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0); 542 543 /* if the extent is allocated and recorded, return the block 544 if the extent is not a multiple of the blocksize, round up */ 545 546 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) { 547 if (elen & (inode->i_sb->s_blocksize - 1)) { 548 elen = EXT_RECORDED_ALLOCATED | 549 ((elen + inode->i_sb->s_blocksize - 1) & 550 ~(inode->i_sb->s_blocksize - 1)); 551 etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1); 552 } 553 brelse(prev_epos.bh); 554 brelse(cur_epos.bh); 555 brelse(next_epos.bh); 556 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset); 557 *phys = newblock; 558 return NULL; 559 } 560 561 last_block = block; 562 /* Are we beyond EOF? */ 563 if (etype == -1) { 564 int ret; 565 566 if (count) { 567 if (c) 568 laarr[0] = laarr[1]; 569 startnum = 1; 570 } else { 571 /* Create a fake extent when there's not one */ 572 memset(&laarr[0].extLocation, 0x00, sizeof(kernel_lb_addr)); 573 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 574 /* Will udf_extend_file() create real extent from a fake one? */ 575 startnum = (offset > 0); 576 } 577 /* Create extents for the hole between EOF and offset */ 578 ret = udf_extend_file(inode, &prev_epos, laarr, offset); 579 if (ret == -1) { 580 brelse(prev_epos.bh); 581 brelse(cur_epos.bh); 582 brelse(next_epos.bh); 583 /* We don't really know the error here so we just make 584 * something up */ 585 *err = -ENOSPC; 586 return NULL; 587 } 588 c = 0; 589 offset = 0; 590 count += ret; 591 /* We are not covered by a preallocated extent? */ 592 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) != EXT_NOT_RECORDED_ALLOCATED) { 593 /* Is there any real extent? - otherwise we overwrite 594 * the fake one... */ 595 if (count) 596 c = !c; 597 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 598 inode->i_sb->s_blocksize; 599 memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr)); 600 count++; 601 endnum++; 602 } 603 endnum = c + 1; 604 lastblock = 1; 605 } else { 606 endnum = startnum = ((count > 2) ? 2 : count); 607 608 /* if the current extent is in position 0, swap it with the previous */ 609 if (!c && count != 1) { 610 laarr[2] = laarr[0]; 611 laarr[0] = laarr[1]; 612 laarr[1] = laarr[2]; 613 c = 1; 614 } 615 616 /* if the current block is located in an extent, read the next extent */ 617 if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0)) != -1) { 618 laarr[c + 1].extLength = (etype << 30) | elen; 619 laarr[c + 1].extLocation = eloc; 620 count++; 621 startnum++; 622 endnum++; 623 } else { 624 lastblock = 1; 625 } 626 } 627 628 /* if the current extent is not recorded but allocated, get the 629 * block in the extent corresponding to the requested block */ 630 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 631 newblocknum = laarr[c].extLocation.logicalBlockNum + offset; 632 } else { /* otherwise, allocate a new block */ 633 if (UDF_I_NEXT_ALLOC_BLOCK(inode) == block) 634 goal = UDF_I_NEXT_ALLOC_GOAL(inode); 635 636 if (!goal) { 637 if (!(goal = pgoal)) 638 goal = UDF_I_LOCATION(inode).logicalBlockNum + 1; 639 } 640 641 if (!(newblocknum = udf_new_block(inode->i_sb, inode, 642 UDF_I_LOCATION(inode).partitionReferenceNum, 643 goal, err))) { 644 brelse(prev_epos.bh); 645 *err = -ENOSPC; 646 return NULL; 647 } 648 UDF_I_LENEXTENTS(inode) += inode->i_sb->s_blocksize; 649 } 650 651 /* if the extent the requsted block is located in contains multiple blocks, 652 * split the extent into at most three extents. blocks prior to requested 653 * block, requested block, and blocks after requested block */ 654 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum); 655 656#ifdef UDF_PREALLOCATE 657 /* preallocate blocks */ 658 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); 659#endif 660 661 /* merge any continuous blocks in laarr */ 662 udf_merge_extents(inode, laarr, &endnum); 663 664 /* write back the new extents, inserting new extents if the new number 665 * of extents is greater than the old number, and deleting extents if 666 * the new number of extents is less than the old number */ 667 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos); 668 669 brelse(prev_epos.bh); 670 671 if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum, 672 UDF_I_LOCATION(inode).partitionReferenceNum, 0))) { 673 return NULL; 674 } 675 *phys = newblock; 676 *err = 0; 677 *new = 1; 678 UDF_I_NEXT_ALLOC_BLOCK(inode) = block; 679 UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum; 680 inode->i_ctime = current_fs_time(inode->i_sb); 681 682 if (IS_SYNC(inode)) 683 udf_sync_inode(inode); 684 else 685 mark_inode_dirty(inode); 686 687 return result; 688} 689 690static void udf_split_extents(struct inode *inode, int *c, int offset, 691 int newblocknum, 692 kernel_long_ad laarr[EXTENT_MERGE_SIZE], 693 int *endnum) 694{ 695 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) || 696 (laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 697 int curr = *c; 698 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) + 699 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits; 700 int8_t etype = (laarr[curr].extLength >> 30); 701 702 if (blen == 1) { 703 ; 704 } else if (!offset || blen == offset + 1) { 705 laarr[curr + 2] = laarr[curr + 1]; 706 laarr[curr + 1] = laarr[curr]; 707 } else { 708 laarr[curr + 3] = laarr[curr + 1]; 709 laarr[curr + 2] = laarr[curr + 1] = laarr[curr]; 710 } 711 712 if (offset) { 713 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 714 udf_free_blocks(inode->i_sb, inode, laarr[curr].extLocation, 0, offset); 715 laarr[curr].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 716 (offset << inode->i_sb->s_blocksize_bits); 717 laarr[curr].extLocation.logicalBlockNum = 0; 718 laarr[curr].extLocation.partitionReferenceNum = 0; 719 } else { 720 laarr[curr].extLength = (etype << 30) | 721 (offset << inode->i_sb->s_blocksize_bits); 722 } 723 curr++; 724 (*c)++; 725 (*endnum)++; 726 } 727 728 laarr[curr].extLocation.logicalBlockNum = newblocknum; 729 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 730 laarr[curr].extLocation.partitionReferenceNum = 731 UDF_I_LOCATION(inode).partitionReferenceNum; 732 laarr[curr].extLength = EXT_RECORDED_ALLOCATED | 733 inode->i_sb->s_blocksize; 734 curr++; 735 736 if (blen != offset + 1) { 737 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 738 laarr[curr].extLocation.logicalBlockNum += (offset + 1); 739 laarr[curr].extLength = (etype << 30) | 740 ((blen - (offset + 1)) << inode->i_sb->s_blocksize_bits); 741 curr++; 742 (*endnum)++; 743 } 744 } 745} 746 747static void udf_prealloc_extents(struct inode *inode, int c, int lastblock, 748 kernel_long_ad laarr[EXTENT_MERGE_SIZE], 749 int *endnum) 750{ 751 int start, length = 0, currlength = 0, i; 752 753 if (*endnum >= (c + 1)) { 754 if (!lastblock) 755 return; 756 else 757 start = c; 758 } else { 759 if ((laarr[c + 1].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 760 start = c + 1; 761 length = currlength = (((laarr[c + 1].extLength & UDF_EXTENT_LENGTH_MASK) + 762 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits); 763 } else { 764 start = c; 765 } 766 } 767 768 for (i = start + 1; i <= *endnum; i++) { 769 if (i == *endnum) { 770 if (lastblock) 771 length += UDF_DEFAULT_PREALLOC_BLOCKS; 772 } else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 773 length += (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 774 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits); 775 } else { 776 break; 777 } 778 } 779 780 if (length) { 781 int next = laarr[start].extLocation.logicalBlockNum + 782 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) + 783 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits); 784 int numalloc = udf_prealloc_blocks(inode->i_sb, inode, 785 laarr[start].extLocation.partitionReferenceNum, 786 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? length : 787 UDF_DEFAULT_PREALLOC_BLOCKS) - currlength); 788 if (numalloc) { 789 if (start == (c + 1)) { 790 laarr[start].extLength += 791 (numalloc << inode->i_sb->s_blocksize_bits); 792 } else { 793 memmove(&laarr[c + 2], &laarr[c + 1], 794 sizeof(long_ad) * (*endnum - (c + 1))); 795 (*endnum)++; 796 laarr[c + 1].extLocation.logicalBlockNum = next; 797 laarr[c + 1].extLocation.partitionReferenceNum = 798 laarr[c].extLocation.partitionReferenceNum; 799 laarr[c + 1].extLength = EXT_NOT_RECORDED_ALLOCATED | 800 (numalloc << inode->i_sb->s_blocksize_bits); 801 start = c + 1; 802 } 803 804 for (i = start + 1; numalloc && i < *endnum; i++) { 805 int elen = ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 806 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits; 807 808 if (elen > numalloc) { 809 laarr[i].extLength -= 810 (numalloc << inode->i_sb->s_blocksize_bits); 811 numalloc = 0; 812 } else { 813 numalloc -= elen; 814 if (*endnum > (i + 1)) 815 memmove(&laarr[i], &laarr[i + 1], 816 sizeof(long_ad) * (*endnum - (i + 1))); 817 i--; 818 (*endnum)--; 819 } 820 } 821 UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits; 822 } 823 } 824} 825 826static void udf_merge_extents(struct inode *inode, 827 kernel_long_ad laarr[EXTENT_MERGE_SIZE], 828 int *endnum) 829{ 830 int i; 831 832 for (i = 0; i < (*endnum - 1); i++) { 833 if ((laarr[i].extLength >> 30) == (laarr[i + 1].extLength >> 30)) { 834 if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) || 835 ((laarr[i + 1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) == 836 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 837 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits))) { 838 if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 839 (laarr[i + 1].extLength & UDF_EXTENT_LENGTH_MASK) + 840 inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { 841 laarr[i + 1].extLength = (laarr[i + 1].extLength - 842 (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 843 UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize - 1); 844 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) + 845 (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize; 846 laarr[i + 1].extLocation.logicalBlockNum = 847 laarr[i].extLocation.logicalBlockNum + 848 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >> 849 inode->i_sb->s_blocksize_bits); 850 } else { 851 laarr[i].extLength = laarr[i + 1].extLength + 852 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 853 inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize - 1)); 854 if (*endnum > (i + 2)) 855 memmove(&laarr[i + 1], &laarr[i + 2], 856 sizeof(long_ad) * (*endnum - (i + 2))); 857 i--; 858 (*endnum)--; 859 } 860 } 861 } else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) && 862 ((laarr[i + 1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) { 863 udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0, 864 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 865 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits); 866 laarr[i].extLocation.logicalBlockNum = 0; 867 laarr[i].extLocation.partitionReferenceNum = 0; 868 869 if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 870 (laarr[i + 1].extLength & UDF_EXTENT_LENGTH_MASK) + 871 inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { 872 laarr[i + 1].extLength = (laarr[i + 1].extLength - 873 (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 874 UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize - 1); 875 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) + 876 (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize; 877 } else { 878 laarr[i].extLength = laarr[i + 1].extLength + 879 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 880 inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize - 1)); 881 if (*endnum > (i + 2)) 882 memmove(&laarr[i + 1], &laarr[i + 2], 883 sizeof(long_ad) * (*endnum - (i + 2))); 884 i--; 885 (*endnum)--; 886 } 887 } else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 888 udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0, 889 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) + 890 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits); 891 laarr[i].extLocation.logicalBlockNum = 0; 892 laarr[i].extLocation.partitionReferenceNum = 0; 893 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) | 894 EXT_NOT_RECORDED_NOT_ALLOCATED; 895 } 896 } 897} 898 899static void udf_update_extents(struct inode *inode, 900 kernel_long_ad laarr[EXTENT_MERGE_SIZE], 901 int startnum, int endnum, 902 struct extent_position *epos) 903{ 904 int start = 0, i; 905 kernel_lb_addr tmploc; 906 uint32_t tmplen; 907 908 if (startnum > endnum) { 909 for (i = 0; i < (startnum - endnum); i++) 910 udf_delete_aext(inode, *epos, laarr[i].extLocation, 911 laarr[i].extLength); 912 } else if (startnum < endnum) { 913 for (i = 0; i < (endnum - startnum); i++) { 914 udf_insert_aext(inode, *epos, laarr[i].extLocation, 915 laarr[i].extLength); 916 udf_next_aext(inode, epos, &laarr[i].extLocation, 917 &laarr[i].extLength, 1); 918 start++; 919 } 920 } 921 922 for (i = start; i < endnum; i++) { 923 udf_next_aext(inode, epos, &tmploc, &tmplen, 0); 924 udf_write_aext(inode, epos, laarr[i].extLocation, 925 laarr[i].extLength, 1); 926 } 927} 928 929struct buffer_head *udf_bread(struct inode *inode, int block, 930 int create, int *err) 931{ 932 struct buffer_head *bh = NULL; 933 934 bh = udf_getblk(inode, block, create, err); 935 if (!bh) 936 return NULL; 937 938 if (buffer_uptodate(bh)) 939 return bh; 940 941 ll_rw_block(READ, 1, &bh); 942 943 wait_on_buffer(bh); 944 if (buffer_uptodate(bh)) 945 return bh; 946 947 brelse(bh); 948 *err = -EIO; 949 return NULL; 950} 951 952void udf_truncate(struct inode *inode) 953{ 954 int offset; 955 int err; 956 957 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 958 S_ISLNK(inode->i_mode))) 959 return; 960 if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) 961 return; 962 963 lock_kernel(); 964 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { 965 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) + 966 inode->i_size)) { 967 udf_expand_file_adinicb(inode, inode->i_size, &err); 968 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { 969 inode->i_size = UDF_I_LENALLOC(inode); 970 unlock_kernel(); 971 return; 972 } else { 973 udf_truncate_extents(inode); 974 } 975 } else { 976 offset = inode->i_size & (inode->i_sb->s_blocksize - 1); 977 memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00, 978 inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode)); 979 UDF_I_LENALLOC(inode) = inode->i_size; 980 } 981 } else { 982 block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block); 983 udf_truncate_extents(inode); 984 } 985 986 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); 987 if (IS_SYNC(inode)) 988 udf_sync_inode(inode); 989 else 990 mark_inode_dirty(inode); 991 unlock_kernel(); 992} 993 994static void __udf_read_inode(struct inode *inode) 995{ 996 struct buffer_head *bh = NULL; 997 struct fileEntry *fe; 998 uint16_t ident; 999 1000 /* 1001 * Set defaults, but the inode is still incomplete! 1002 * Note: get_new_inode() sets the following on a new inode: 1003 * i_sb = sb 1004 * i_no = ino 1005 * i_flags = sb->s_flags 1006 * i_state = 0 1007 * clean_inode(): zero fills and sets 1008 * i_count = 1 1009 * i_nlink = 1 1010 * i_op = NULL; 1011 */ 1012 bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident); 1013 if (!bh) { 1014 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n", 1015 inode->i_ino); 1016 make_bad_inode(inode); 1017 return; 1018 } 1019 1020 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE && 1021 ident != TAG_IDENT_USE) { 1022 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n", 1023 inode->i_ino, ident); 1024 brelse(bh); 1025 make_bad_inode(inode); 1026 return; 1027 } 1028 1029 fe = (struct fileEntry *)bh->b_data; 1030 1031 if (le16_to_cpu(fe->icbTag.strategyType) == 4096) { 1032 struct buffer_head *ibh = NULL, *nbh = NULL; 1033 struct indirectEntry *ie; 1034 1035 ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident); 1036 if (ident == TAG_IDENT_IE) { 1037 if (ibh) { 1038 kernel_lb_addr loc; 1039 ie = (struct indirectEntry *)ibh->b_data; 1040 1041 loc = lelb_to_cpu(ie->indirectICB.extLocation); 1042 1043 if (ie->indirectICB.extLength && 1044 (nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident))) { 1045 if (ident == TAG_IDENT_FE || 1046 ident == TAG_IDENT_EFE) { 1047 memcpy(&UDF_I_LOCATION(inode), &loc, 1048 sizeof(kernel_lb_addr)); 1049 brelse(bh); 1050 brelse(ibh); 1051 brelse(nbh); 1052 __udf_read_inode(inode); 1053 return; 1054 } else { 1055 brelse(nbh); 1056 brelse(ibh); 1057 } 1058 } else { 1059 brelse(ibh); 1060 } 1061 } 1062 } else { 1063 brelse(ibh); 1064 } 1065 } else if (le16_to_cpu(fe->icbTag.strategyType) != 4) { 1066 printk(KERN_ERR "udf: unsupported strategy type: %d\n", 1067 le16_to_cpu(fe->icbTag.strategyType)); 1068 brelse(bh); 1069 make_bad_inode(inode); 1070 return; 1071 } 1072 udf_fill_inode(inode, bh); 1073 1074 brelse(bh); 1075} 1076 1077static void udf_fill_inode(struct inode *inode, struct buffer_head *bh) 1078{ 1079 struct fileEntry *fe; 1080 struct extendedFileEntry *efe; 1081 time_t convtime; 1082 long convtime_usec; 1083 int offset; 1084 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1085 1086 fe = (struct fileEntry *)bh->b_data; 1087 efe = (struct extendedFileEntry *)bh->b_data; 1088 1089 if (le16_to_cpu(fe->icbTag.strategyType) == 4) 1090 UDF_I_STRAT4096(inode) = 0; 1091 else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */ 1092 UDF_I_STRAT4096(inode) = 1; 1093 1094 UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK; 1095 UDF_I_UNIQUE(inode) = 0; 1096 UDF_I_LENEATTR(inode) = 0; 1097 UDF_I_LENEXTENTS(inode) = 0; 1098 UDF_I_LENALLOC(inode) = 0; 1099 UDF_I_NEXT_ALLOC_BLOCK(inode) = 0; 1100 UDF_I_NEXT_ALLOC_GOAL(inode) = 0; 1101 if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE) { 1102 UDF_I_EFE(inode) = 1; 1103 UDF_I_USE(inode) = 0; 1104 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry))) { 1105 make_bad_inode(inode); 1106 return; 1107 } 1108 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), 1109 inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry)); 1110 } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE) { 1111 UDF_I_EFE(inode) = 0; 1112 UDF_I_USE(inode) = 0; 1113 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct fileEntry))) { 1114 make_bad_inode(inode); 1115 return; 1116 } 1117 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), 1118 inode->i_sb->s_blocksize - sizeof(struct fileEntry)); 1119 } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) { 1120 UDF_I_EFE(inode) = 0; 1121 UDF_I_USE(inode) = 1; 1122 UDF_I_LENALLOC(inode) = 1123 le32_to_cpu(((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs); 1124 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry))) { 1125 make_bad_inode(inode); 1126 return; 1127 } 1128 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), 1129 inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry)); 1130 return; 1131 } 1132 1133 inode->i_uid = le32_to_cpu(fe->uid); 1134 if (inode->i_uid == -1 || 1135 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) || 1136 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET)) 1137 inode->i_uid = UDF_SB(inode->i_sb)->s_uid; 1138 1139 inode->i_gid = le32_to_cpu(fe->gid); 1140 if (inode->i_gid == -1 || 1141 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) || 1142 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET)) 1143 inode->i_gid = UDF_SB(inode->i_sb)->s_gid; 1144 1145 inode->i_nlink = le16_to_cpu(fe->fileLinkCount); 1146 if (!inode->i_nlink) 1147 inode->i_nlink = 1; 1148 1149 inode->i_size = le64_to_cpu(fe->informationLength); 1150 UDF_I_LENEXTENTS(inode) = inode->i_size; 1151 1152 inode->i_mode = udf_convert_permissions(fe); 1153 inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask; 1154 1155 if (UDF_I_EFE(inode) == 0) { 1156 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) << 1157 (inode->i_sb->s_blocksize_bits - 9); 1158 1159 if (udf_stamp_to_time(&convtime, &convtime_usec, 1160 lets_to_cpu(fe->accessTime))) { 1161 inode->i_atime.tv_sec = convtime; 1162 inode->i_atime.tv_nsec = convtime_usec * 1000; 1163 } else { 1164 inode->i_atime = sbi->s_record_time; 1165 } 1166 1167 if (udf_stamp_to_time(&convtime, &convtime_usec, 1168 lets_to_cpu(fe->modificationTime))) { 1169 inode->i_mtime.tv_sec = convtime; 1170 inode->i_mtime.tv_nsec = convtime_usec * 1000; 1171 } else { 1172 inode->i_mtime = sbi->s_record_time; 1173 } 1174 1175 if (udf_stamp_to_time(&convtime, &convtime_usec, 1176 lets_to_cpu(fe->attrTime))) { 1177 inode->i_ctime.tv_sec = convtime; 1178 inode->i_ctime.tv_nsec = convtime_usec * 1000; 1179 } else { 1180 inode->i_ctime = sbi->s_record_time; 1181 } 1182 1183 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID); 1184 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr); 1185 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs); 1186 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode); 1187 } else { 1188 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << 1189 (inode->i_sb->s_blocksize_bits - 9); 1190 1191 if (udf_stamp_to_time(&convtime, &convtime_usec, 1192 lets_to_cpu(efe->accessTime))) { 1193 inode->i_atime.tv_sec = convtime; 1194 inode->i_atime.tv_nsec = convtime_usec * 1000; 1195 } else { 1196 inode->i_atime = sbi->s_record_time; 1197 } 1198 1199 if (udf_stamp_to_time(&convtime, &convtime_usec, 1200 lets_to_cpu(efe->modificationTime))) { 1201 inode->i_mtime.tv_sec = convtime; 1202 inode->i_mtime.tv_nsec = convtime_usec * 1000; 1203 } else { 1204 inode->i_mtime = sbi->s_record_time; 1205 } 1206 1207 if (udf_stamp_to_time(&convtime, &convtime_usec, 1208 lets_to_cpu(efe->createTime))) { 1209 UDF_I_CRTIME(inode).tv_sec = convtime; 1210 UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000; 1211 } else { 1212 UDF_I_CRTIME(inode) = sbi->s_record_time; 1213 } 1214 1215 if (udf_stamp_to_time(&convtime, &convtime_usec, 1216 lets_to_cpu(efe->attrTime))) { 1217 inode->i_ctime.tv_sec = convtime; 1218 inode->i_ctime.tv_nsec = convtime_usec * 1000; 1219 } else { 1220 inode->i_ctime = sbi->s_record_time; 1221 } 1222 1223 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID); 1224 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr); 1225 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs); 1226 offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode); 1227 } 1228 1229 switch (fe->icbTag.fileType) { 1230 case ICBTAG_FILE_TYPE_DIRECTORY: 1231 inode->i_op = &udf_dir_inode_operations; 1232 inode->i_fop = &udf_dir_operations; 1233 inode->i_mode |= S_IFDIR; 1234 inc_nlink(inode); 1235 break; 1236 case ICBTAG_FILE_TYPE_REALTIME: 1237 case ICBTAG_FILE_TYPE_REGULAR: 1238 case ICBTAG_FILE_TYPE_UNDEF: 1239 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) 1240 inode->i_data.a_ops = &udf_adinicb_aops; 1241 else 1242 inode->i_data.a_ops = &udf_aops; 1243 inode->i_op = &udf_file_inode_operations; 1244 inode->i_fop = &udf_file_operations; 1245 inode->i_mode |= S_IFREG; 1246 break; 1247 case ICBTAG_FILE_TYPE_BLOCK: 1248 inode->i_mode |= S_IFBLK; 1249 break; 1250 case ICBTAG_FILE_TYPE_CHAR: 1251 inode->i_mode |= S_IFCHR; 1252 break; 1253 case ICBTAG_FILE_TYPE_FIFO: 1254 init_special_inode(inode, inode->i_mode | S_IFIFO, 0); 1255 break; 1256 case ICBTAG_FILE_TYPE_SOCKET: 1257 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0); 1258 break; 1259 case ICBTAG_FILE_TYPE_SYMLINK: 1260 inode->i_data.a_ops = &udf_symlink_aops; 1261 inode->i_op = &page_symlink_inode_operations; 1262 inode->i_mode = S_IFLNK | S_IRWXUGO; 1263 break; 1264 default: 1265 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n", 1266 inode->i_ino, fe->icbTag.fileType); 1267 make_bad_inode(inode); 1268 return; 1269 } 1270 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1271 struct deviceSpec *dsea = (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1272 if (dsea) { 1273 init_special_inode(inode, inode->i_mode, 1274 MKDEV(le32_to_cpu(dsea->majorDeviceIdent), 1275 le32_to_cpu(dsea->minorDeviceIdent))); 1276 /* Developer ID ??? */ 1277 } else { 1278 make_bad_inode(inode); 1279 } 1280 } 1281} 1282 1283static int udf_alloc_i_data(struct inode *inode, size_t size) 1284{ 1285 UDF_I_DATA(inode) = kmalloc(size, GFP_KERNEL); 1286 1287 if (!UDF_I_DATA(inode)) { 1288 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) no free memory\n", 1289 inode->i_ino); 1290 return -ENOMEM; 1291 } 1292 1293 return 0; 1294} 1295 1296static mode_t udf_convert_permissions(struct fileEntry *fe) 1297{ 1298 mode_t mode; 1299 uint32_t permissions; 1300 uint32_t flags; 1301 1302 permissions = le32_to_cpu(fe->permissions); 1303 flags = le16_to_cpu(fe->icbTag.flags); 1304 1305 mode = (( permissions ) & S_IRWXO) | 1306 (( permissions >> 2 ) & S_IRWXG) | 1307 (( permissions >> 4 ) & S_IRWXU) | 1308 (( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) | 1309 (( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) | 1310 (( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0); 1311 1312 return mode; 1313} 1314 1315/* 1316 * udf_write_inode 1317 * 1318 * PURPOSE 1319 * Write out the specified inode. 1320 * 1321 * DESCRIPTION 1322 * This routine is called whenever an inode is synced. 1323 * Currently this routine is just a placeholder. 1324 * 1325 * HISTORY 1326 * July 1, 1997 - Andrew E. Mileski 1327 * Written, tested, and released. 1328 */ 1329 1330int udf_write_inode(struct inode *inode, int sync) 1331{ 1332 int ret; 1333 1334 lock_kernel(); 1335 ret = udf_update_inode(inode, sync); 1336 unlock_kernel(); 1337 1338 return ret; 1339} 1340 1341int udf_sync_inode(struct inode *inode) 1342{ 1343 return udf_update_inode(inode, 1); 1344} 1345 1346static int udf_update_inode(struct inode *inode, int do_sync) 1347{ 1348 struct buffer_head *bh = NULL; 1349 struct fileEntry *fe; 1350 struct extendedFileEntry *efe; 1351 uint32_t udfperms; 1352 uint16_t icbflags; 1353 uint16_t crclen; 1354 int i; 1355 kernel_timestamp cpu_time; 1356 int err = 0; 1357 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1358 1359 bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0)); 1360 if (!bh) { 1361 udf_debug("bread failure\n"); 1362 return -EIO; 1363 } 1364 1365 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); 1366 1367 fe = (struct fileEntry *)bh->b_data; 1368 efe = (struct extendedFileEntry *)bh->b_data; 1369 1370 if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) { 1371 struct unallocSpaceEntry *use = 1372 (struct unallocSpaceEntry *)bh->b_data; 1373 1374 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode)); 1375 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode), 1376 inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry)); 1377 crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) - sizeof(tag); 1378 use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum); 1379 use->descTag.descCRCLength = cpu_to_le16(crclen); 1380 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0)); 1381 1382 use->descTag.tagChecksum = 0; 1383 for (i = 0; i < 16; i++) { 1384 if (i != 4) 1385 use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i]; 1386 } 1387 1388 mark_buffer_dirty(bh); 1389 brelse(bh); 1390 return err; 1391 } 1392 1393 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET)) 1394 fe->uid = cpu_to_le32(-1); 1395 else 1396 fe->uid = cpu_to_le32(inode->i_uid); 1397 1398 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET)) 1399 fe->gid = cpu_to_le32(-1); 1400 else 1401 fe->gid = cpu_to_le32(inode->i_gid); 1402 1403 udfperms = ((inode->i_mode & S_IRWXO) ) | 1404 ((inode->i_mode & S_IRWXG) << 2) | 1405 ((inode->i_mode & S_IRWXU) << 4); 1406 1407 udfperms |= (le32_to_cpu(fe->permissions) & 1408 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR | 1409 FE_PERM_G_DELETE | FE_PERM_G_CHATTR | 1410 FE_PERM_U_DELETE | FE_PERM_U_CHATTR)); 1411 fe->permissions = cpu_to_le32(udfperms); 1412 1413 if (S_ISDIR(inode->i_mode)) 1414 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1); 1415 else 1416 fe->fileLinkCount = cpu_to_le16(inode->i_nlink); 1417 1418 fe->informationLength = cpu_to_le64(inode->i_size); 1419 1420 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1421 regid *eid; 1422 struct deviceSpec *dsea = 1423 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1424 if (!dsea) { 1425 dsea = (struct deviceSpec *) 1426 udf_add_extendedattr(inode, 1427 sizeof(struct deviceSpec) + 1428 sizeof(regid), 12, 0x3); 1429 dsea->attrType = cpu_to_le32(12); 1430 dsea->attrSubtype = 1; 1431 dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) + 1432 sizeof(regid)); 1433 dsea->impUseLength = cpu_to_le32(sizeof(regid)); 1434 } 1435 eid = (regid *)dsea->impUse; 1436 memset(eid, 0, sizeof(regid)); 1437 strcpy(eid->ident, UDF_ID_DEVELOPER); 1438 eid->identSuffix[0] = UDF_OS_CLASS_UNIX; 1439 eid->identSuffix[1] = UDF_OS_ID_LINUX; 1440 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode)); 1441 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode)); 1442 } 1443 1444 if (UDF_I_EFE(inode) == 0) { 1445 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode), 1446 inode->i_sb->s_blocksize - sizeof(struct fileEntry)); 1447 fe->logicalBlocksRecorded = cpu_to_le64( 1448 (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >> 1449 (inode->i_sb->s_blocksize_bits - 9)); 1450 1451 if (udf_time_to_stamp(&cpu_time, inode->i_atime)) 1452 fe->accessTime = cpu_to_lets(cpu_time); 1453 if (udf_time_to_stamp(&cpu_time, inode->i_mtime)) 1454 fe->modificationTime = cpu_to_lets(cpu_time); 1455 if (udf_time_to_stamp(&cpu_time, inode->i_ctime)) 1456 fe->attrTime = cpu_to_lets(cpu_time); 1457 memset(&(fe->impIdent), 0, sizeof(regid)); 1458 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER); 1459 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1460 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1461 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode)); 1462 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode)); 1463 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode)); 1464 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE); 1465 crclen = sizeof(struct fileEntry); 1466 } else { 1467 memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode), 1468 inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry)); 1469 efe->objectSize = cpu_to_le64(inode->i_size); 1470 efe->logicalBlocksRecorded = cpu_to_le64( 1471 (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >> 1472 (inode->i_sb->s_blocksize_bits - 9)); 1473 1474 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec || 1475 (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec && 1476 UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec)) { 1477 UDF_I_CRTIME(inode) = inode->i_atime; 1478 } 1479 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec || 1480 (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec && 1481 UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec)) { 1482 UDF_I_CRTIME(inode) = inode->i_mtime; 1483 } 1484 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec || 1485 (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec && 1486 UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec)) { 1487 UDF_I_CRTIME(inode) = inode->i_ctime; 1488 } 1489 1490 if (udf_time_to_stamp(&cpu_time, inode->i_atime)) 1491 efe->accessTime = cpu_to_lets(cpu_time); 1492 if (udf_time_to_stamp(&cpu_time, inode->i_mtime)) 1493 efe->modificationTime = cpu_to_lets(cpu_time); 1494 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode))) 1495 efe->createTime = cpu_to_lets(cpu_time); 1496 if (udf_time_to_stamp(&cpu_time, inode->i_ctime)) 1497 efe->attrTime = cpu_to_lets(cpu_time); 1498 1499 memset(&(efe->impIdent), 0, sizeof(regid)); 1500 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER); 1501 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1502 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1503 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode)); 1504 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode)); 1505 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode)); 1506 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE); 1507 crclen = sizeof(struct extendedFileEntry); 1508 } 1509 if (UDF_I_STRAT4096(inode)) { 1510 fe->icbTag.strategyType = cpu_to_le16(4096); 1511 fe->icbTag.strategyParameter = cpu_to_le16(1); 1512 fe->icbTag.numEntries = cpu_to_le16(2); 1513 } else { 1514 fe->icbTag.strategyType = cpu_to_le16(4); 1515 fe->icbTag.numEntries = cpu_to_le16(1); 1516 } 1517 1518 if (S_ISDIR(inode->i_mode)) 1519 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY; 1520 else if (S_ISREG(inode->i_mode)) 1521 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR; 1522 else if (S_ISLNK(inode->i_mode)) 1523 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK; 1524 else if (S_ISBLK(inode->i_mode)) 1525 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK; 1526 else if (S_ISCHR(inode->i_mode)) 1527 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR; 1528 else if (S_ISFIFO(inode->i_mode)) 1529 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO; 1530 else if (S_ISSOCK(inode->i_mode)) 1531 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET; 1532 1533 icbflags = UDF_I_ALLOCTYPE(inode) | 1534 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) | 1535 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) | 1536 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) | 1537 (le16_to_cpu(fe->icbTag.flags) & 1538 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID | 1539 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY)); 1540 1541 fe->icbTag.flags = cpu_to_le16(icbflags); 1542 if (sbi->s_udfrev >= 0x0200) 1543 fe->descTag.descVersion = cpu_to_le16(3); 1544 else 1545 fe->descTag.descVersion = cpu_to_le16(2); 1546 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number); 1547 fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum); 1548 crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag); 1549 fe->descTag.descCRCLength = cpu_to_le16(crclen); 1550 fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0)); 1551 1552 fe->descTag.tagChecksum = 0; 1553 for (i = 0; i < 16; i++) { 1554 if (i != 4) 1555 fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i]; 1556 } 1557 1558 /* write the data blocks */ 1559 mark_buffer_dirty(bh); 1560 if (do_sync) { 1561 sync_dirty_buffer(bh); 1562 if (buffer_req(bh) && !buffer_uptodate(bh)) { 1563 printk("IO error syncing udf inode [%s:%08lx]\n", 1564 inode->i_sb->s_id, inode->i_ino); 1565 err = -EIO; 1566 } 1567 } 1568 brelse(bh); 1569 1570 return err; 1571} 1572 1573struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino) 1574{ 1575 unsigned long block = udf_get_lb_pblock(sb, ino, 0); 1576 struct inode *inode = iget_locked(sb, block); 1577 1578 if (!inode) 1579 return NULL; 1580 1581 if (inode->i_state & I_NEW) { 1582 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr)); 1583 __udf_read_inode(inode); 1584 unlock_new_inode(inode); 1585 } 1586 1587 if (is_bad_inode(inode)) 1588 goto out_iput; 1589 1590 if (ino.logicalBlockNum >= UDF_SB(sb)->s_partmaps[ino.partitionReferenceNum].s_partition_len) { 1591 udf_debug("block=%d, partition=%d out of range\n", 1592 ino.logicalBlockNum, ino.partitionReferenceNum); 1593 make_bad_inode(inode); 1594 goto out_iput; 1595 } 1596 1597 return inode; 1598 1599 out_iput: 1600 iput(inode); 1601 return NULL; 1602} 1603 1604int8_t udf_add_aext(struct inode * inode, struct extent_position * epos, 1605 kernel_lb_addr eloc, uint32_t elen, int inc) 1606{ 1607 int adsize; 1608 short_ad *sad = NULL; 1609 long_ad *lad = NULL; 1610 struct allocExtDesc *aed; 1611 int8_t etype; 1612 uint8_t *ptr; 1613 1614 if (!epos->bh) 1615 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode); 1616 else 1617 ptr = epos->bh->b_data + epos->offset; 1618 1619 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT) 1620 adsize = sizeof(short_ad); 1621 else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG) 1622 adsize = sizeof(long_ad); 1623 else 1624 return -1; 1625 1626 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) { 1627 char *sptr, *dptr; 1628 struct buffer_head *nbh; 1629 int err, loffset; 1630 kernel_lb_addr obloc = epos->block; 1631 1632 if (!(epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL, 1633 obloc.partitionReferenceNum, 1634 obloc.logicalBlockNum, &err))) { 1635 return -1; 1636 } 1637 if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb, 1638 epos->block, 0)))) { 1639 return -1; 1640 } 1641 lock_buffer(nbh); 1642 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize); 1643 set_buffer_uptodate(nbh); 1644 unlock_buffer(nbh); 1645 mark_buffer_dirty_inode(nbh, inode); 1646 1647 aed = (struct allocExtDesc *)(nbh->b_data); 1648 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 1649 aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum); 1650 if (epos->offset + adsize > inode->i_sb->s_blocksize) { 1651 loffset = epos->offset; 1652 aed->lengthAllocDescs = cpu_to_le32(adsize); 1653 sptr = ptr - adsize; 1654 dptr = nbh->b_data + sizeof(struct allocExtDesc); 1655 memcpy(dptr, sptr, adsize); 1656 epos->offset = sizeof(struct allocExtDesc) + adsize; 1657 } else { 1658 loffset = epos->offset + adsize; 1659 aed->lengthAllocDescs = cpu_to_le32(0); 1660 sptr = ptr; 1661 epos->offset = sizeof(struct allocExtDesc); 1662 1663 if (epos->bh) { 1664 aed = (struct allocExtDesc *)epos->bh->b_data; 1665 aed->lengthAllocDescs = 1666 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize); 1667 } else { 1668 UDF_I_LENALLOC(inode) += adsize; 1669 mark_inode_dirty(inode); 1670 } 1671 } 1672 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200) 1673 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1, 1674 epos->block.logicalBlockNum, sizeof(tag)); 1675 else 1676 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1, 1677 epos->block.logicalBlockNum, sizeof(tag)); 1678 switch (UDF_I_ALLOCTYPE(inode)) { 1679 case ICBTAG_FLAG_AD_SHORT: 1680 sad = (short_ad *)sptr; 1681 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS | 1682 inode->i_sb->s_blocksize); 1683 sad->extPosition = cpu_to_le32(epos->block.logicalBlockNum); 1684 break; 1685 case ICBTAG_FLAG_AD_LONG: 1686 lad = (long_ad *)sptr; 1687 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS | 1688 inode->i_sb->s_blocksize); 1689 lad->extLocation = cpu_to_lelb(epos->block); 1690 memset(lad->impUse, 0x00, sizeof(lad->impUse)); 1691 break; 1692 } 1693 if (epos->bh) { 1694 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1695 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 1696 udf_update_tag(epos->bh->b_data, loffset); 1697 else 1698 udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc)); 1699 mark_buffer_dirty_inode(epos->bh, inode); 1700 brelse(epos->bh); 1701 } else { 1702 mark_inode_dirty(inode); 1703 } 1704 epos->bh = nbh; 1705 } 1706 1707 etype = udf_write_aext(inode, epos, eloc, elen, inc); 1708 1709 if (!epos->bh) { 1710 UDF_I_LENALLOC(inode) += adsize; 1711 mark_inode_dirty(inode); 1712 } else { 1713 aed = (struct allocExtDesc *)epos->bh->b_data; 1714 aed->lengthAllocDescs = 1715 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize); 1716 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 1717 udf_update_tag(epos->bh->b_data, epos->offset + (inc ? 0 : adsize)); 1718 else 1719 udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc)); 1720 mark_buffer_dirty_inode(epos->bh, inode); 1721 } 1722 1723 return etype; 1724} 1725 1726int8_t udf_write_aext(struct inode * inode, struct extent_position * epos, 1727 kernel_lb_addr eloc, uint32_t elen, int inc) 1728{ 1729 int adsize; 1730 uint8_t *ptr; 1731 short_ad *sad; 1732 long_ad *lad; 1733 1734 if (!epos->bh) 1735 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode); 1736 else 1737 ptr = epos->bh->b_data + epos->offset; 1738 1739 switch (UDF_I_ALLOCTYPE(inode)) { 1740 case ICBTAG_FLAG_AD_SHORT: 1741 sad = (short_ad *)ptr; 1742 sad->extLength = cpu_to_le32(elen); 1743 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum); 1744 adsize = sizeof(short_ad); 1745 break; 1746 case ICBTAG_FLAG_AD_LONG: 1747 lad = (long_ad *)ptr; 1748 lad->extLength = cpu_to_le32(elen); 1749 lad->extLocation = cpu_to_lelb(eloc); 1750 memset(lad->impUse, 0x00, sizeof(lad->impUse)); 1751 adsize = sizeof(long_ad); 1752 break; 1753 default: 1754 return -1; 1755 } 1756 1757 if (epos->bh) { 1758 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1759 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) { 1760 struct allocExtDesc *aed = (struct allocExtDesc *)epos->bh->b_data; 1761 udf_update_tag(epos->bh->b_data, 1762 le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc)); 1763 } 1764 mark_buffer_dirty_inode(epos->bh, inode); 1765 } else { 1766 mark_inode_dirty(inode); 1767 } 1768 1769 if (inc) 1770 epos->offset += adsize; 1771 1772 return (elen >> 30); 1773} 1774 1775int8_t udf_next_aext(struct inode * inode, struct extent_position * epos, 1776 kernel_lb_addr * eloc, uint32_t * elen, int inc) 1777{ 1778 int8_t etype; 1779 1780 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) == 1781 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) { 1782 epos->block = *eloc; 1783 epos->offset = sizeof(struct allocExtDesc); 1784 brelse(epos->bh); 1785 if (!(epos->bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, epos->block, 0)))) { 1786 udf_debug("reading block %d failed!\n", 1787 udf_get_lb_pblock(inode->i_sb, epos->block, 0)); 1788 return -1; 1789 } 1790 } 1791 1792 return etype; 1793} 1794 1795int8_t udf_current_aext(struct inode * inode, struct extent_position * epos, 1796 kernel_lb_addr * eloc, uint32_t * elen, int inc) 1797{ 1798 int alen; 1799 int8_t etype; 1800 uint8_t *ptr; 1801 short_ad *sad; 1802 long_ad *lad; 1803 1804 1805 if (!epos->bh) { 1806 if (!epos->offset) 1807 epos->offset = udf_file_entry_alloc_offset(inode); 1808 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode); 1809 alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode); 1810 } else { 1811 if (!epos->offset) 1812 epos->offset = sizeof(struct allocExtDesc); 1813 ptr = epos->bh->b_data + epos->offset; 1814 alen = sizeof(struct allocExtDesc) + 1815 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->lengthAllocDescs); 1816 } 1817 1818 switch (UDF_I_ALLOCTYPE(inode)) { 1819 case ICBTAG_FLAG_AD_SHORT: 1820 if (!(sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc))) 1821 return -1; 1822 etype = le32_to_cpu(sad->extLength) >> 30; 1823 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition); 1824 eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum; 1825 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK; 1826 break; 1827 case ICBTAG_FLAG_AD_LONG: 1828 if (!(lad = udf_get_filelongad(ptr, alen, &epos->offset, inc))) 1829 return -1; 1830 etype = le32_to_cpu(lad->extLength) >> 30; 1831 *eloc = lelb_to_cpu(lad->extLocation); 1832 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK; 1833 break; 1834 default: 1835 udf_debug("alloc_type = %d unsupported\n", UDF_I_ALLOCTYPE(inode)); 1836 return -1; 1837 } 1838 1839 return etype; 1840} 1841 1842static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos, 1843 kernel_lb_addr neloc, uint32_t nelen) 1844{ 1845 kernel_lb_addr oeloc; 1846 uint32_t oelen; 1847 int8_t etype; 1848 1849 if (epos.bh) 1850 get_bh(epos.bh); 1851 1852 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) { 1853 udf_write_aext(inode, &epos, neloc, nelen, 1); 1854 neloc = oeloc; 1855 nelen = (etype << 30) | oelen; 1856 } 1857 udf_add_aext(inode, &epos, neloc, nelen, 1); 1858 brelse(epos.bh); 1859 1860 return (nelen >> 30); 1861} 1862 1863int8_t udf_delete_aext(struct inode * inode, struct extent_position epos, 1864 kernel_lb_addr eloc, uint32_t elen) 1865{ 1866 struct extent_position oepos; 1867 int adsize; 1868 int8_t etype; 1869 struct allocExtDesc *aed; 1870 1871 if (epos.bh) { 1872 get_bh(epos.bh); 1873 get_bh(epos.bh); 1874 } 1875 1876 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT) 1877 adsize = sizeof(short_ad); 1878 else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG) 1879 adsize = sizeof(long_ad); 1880 else 1881 adsize = 0; 1882 1883 oepos = epos; 1884 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1) 1885 return -1; 1886 1887 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) { 1888 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1); 1889 if (oepos.bh != epos.bh) { 1890 oepos.block = epos.block; 1891 brelse(oepos.bh); 1892 get_bh(epos.bh); 1893 oepos.bh = epos.bh; 1894 oepos.offset = epos.offset - adsize; 1895 } 1896 } 1897 memset(&eloc, 0x00, sizeof(kernel_lb_addr)); 1898 elen = 0; 1899 1900 if (epos.bh != oepos.bh) { 1901 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1); 1902 udf_write_aext(inode, &oepos, eloc, elen, 1); 1903 udf_write_aext(inode, &oepos, eloc, elen, 1); 1904 if (!oepos.bh) { 1905 UDF_I_LENALLOC(inode) -= (adsize * 2); 1906 mark_inode_dirty(inode); 1907 } else { 1908 aed = (struct allocExtDesc *)oepos.bh->b_data; 1909 aed->lengthAllocDescs = 1910 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2 * adsize)); 1911 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1912 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 1913 udf_update_tag(oepos.bh->b_data, oepos.offset - (2 * adsize)); 1914 else 1915 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc)); 1916 mark_buffer_dirty_inode(oepos.bh, inode); 1917 } 1918 } else { 1919 udf_write_aext(inode, &oepos, eloc, elen, 1); 1920 if (!oepos.bh) { 1921 UDF_I_LENALLOC(inode) -= adsize; 1922 mark_inode_dirty(inode); 1923 } else { 1924 aed = (struct allocExtDesc *)oepos.bh->b_data; 1925 aed->lengthAllocDescs = 1926 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize); 1927 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1928 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 1929 udf_update_tag(oepos.bh->b_data, epos.offset - adsize); 1930 else 1931 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc)); 1932 mark_buffer_dirty_inode(oepos.bh, inode); 1933 } 1934 } 1935 1936 brelse(epos.bh); 1937 brelse(oepos.bh); 1938 1939 return (elen >> 30); 1940} 1941 1942int8_t inode_bmap(struct inode * inode, sector_t block, 1943 struct extent_position * pos, kernel_lb_addr * eloc, 1944 uint32_t * elen, sector_t * offset) 1945{ 1946 loff_t lbcount = 0, bcount = 1947 (loff_t) block << inode->i_sb->s_blocksize_bits; 1948 int8_t etype; 1949 1950 if (block < 0) { 1951 printk(KERN_ERR "udf: inode_bmap: block < 0\n"); 1952 return -1; 1953 } 1954 1955 pos->offset = 0; 1956 pos->block = UDF_I_LOCATION(inode); 1957 pos->bh = NULL; 1958 *elen = 0; 1959 1960 do { 1961 if ((etype = udf_next_aext(inode, pos, eloc, elen, 1)) == -1) { 1962 *offset = (bcount - lbcount) >> inode->i_sb->s_blocksize_bits; 1963 UDF_I_LENEXTENTS(inode) = lbcount; 1964 return -1; 1965 } 1966 lbcount += *elen; 1967 } while (lbcount <= bcount); 1968 1969 *offset = (bcount + *elen - lbcount) >> inode->i_sb->s_blocksize_bits; 1970 1971 return etype; 1972} 1973 1974long udf_block_map(struct inode *inode, sector_t block) 1975{ 1976 kernel_lb_addr eloc; 1977 uint32_t elen; 1978 sector_t offset; 1979 struct extent_position epos = {}; 1980 int ret; 1981 1982 lock_kernel(); 1983 1984 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) 1985 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset); 1986 else 1987 ret = 0; 1988 1989 unlock_kernel(); 1990 brelse(epos.bh); 1991 1992 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV)) 1993 return udf_fixed_to_variable(ret); 1994 else 1995 return ret; 1996} 1997