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 23 * and udf_read_inode 24 * 12/12/98 rewrote udf_block_map to handle next extents and descs across 25 * block boundaries (which is not actually allowed) 26 * 12/20/98 added support for strategy 4096 27 * 03/07/99 rewrote udf_block_map (again) 28 * New funcs, inode_bmap, udf_next_aext 29 * 04/19/99 Support for writing device EA's for major/minor # 30 */ 31 32 #include "udfdecl.h" 33 #include <linux/mm.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 #include <linux/crc-itu-t.h> 40 41 #include "udf_i.h" 42 #include "udf_sb.h" 43 44 MODULE_AUTHOR("Ben Fennema"); 45 MODULE_DESCRIPTION("Universal Disk Format Filesystem"); 46 MODULE_LICENSE("GPL"); 47 48 #define EXTENT_MERGE_SIZE 5 49 50 static mode_t udf_convert_permissions(struct fileEntry *); 51 static int udf_update_inode(struct inode *, int); 52 static void udf_fill_inode(struct inode *, struct buffer_head *); 53 static int udf_sync_inode(struct inode *inode); 54 static int udf_alloc_i_data(struct inode *inode, size_t size); 55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *, 56 sector_t *, int *); 57 static int8_t udf_insert_aext(struct inode *, struct extent_position, 58 struct kernel_lb_addr, uint32_t); 59 static void udf_split_extents(struct inode *, int *, int, int, 60 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *); 61 static void udf_prealloc_extents(struct inode *, int, int, 62 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *); 63 static void udf_merge_extents(struct inode *, 64 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *); 65 static void udf_update_extents(struct inode *, 66 struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int, 67 struct extent_position *); 68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int); 69 70 71 void udf_evict_inode(struct inode *inode) 72 { 73 struct udf_inode_info *iinfo = UDF_I(inode); 74 int want_delete = 0; 75 76 if (!inode->i_nlink && !is_bad_inode(inode)) { 77 want_delete = 1; 78 udf_setsize(inode, 0); 79 udf_update_inode(inode, IS_SYNC(inode)); 80 } else 81 truncate_inode_pages(&inode->i_data, 0); 82 invalidate_inode_buffers(inode); 83 end_writeback(inode); 84 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && 85 inode->i_size != iinfo->i_lenExtents) { 86 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has " 87 "inode size %llu different from extent length %llu. " 88 "Filesystem need not be standards compliant.\n", 89 inode->i_sb->s_id, inode->i_ino, inode->i_mode, 90 (unsigned long long)inode->i_size, 91 (unsigned long long)iinfo->i_lenExtents); 92 } 93 kfree(iinfo->i_ext.i_data); 94 iinfo->i_ext.i_data = NULL; 95 if (want_delete) { 96 udf_free_inode(inode); 97 } 98 } 99 100 static int udf_writepage(struct page *page, struct writeback_control *wbc) 101 { 102 return block_write_full_page(page, udf_get_block, wbc); 103 } 104 105 static int udf_readpage(struct file *file, struct page *page) 106 { 107 return block_read_full_page(page, udf_get_block); 108 } 109 110 static int udf_write_begin(struct file *file, struct address_space *mapping, 111 loff_t pos, unsigned len, unsigned flags, 112 struct page **pagep, void **fsdata) 113 { 114 int ret; 115 116 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block); 117 if (unlikely(ret)) { 118 struct inode *inode = mapping->host; 119 struct udf_inode_info *iinfo = UDF_I(inode); 120 loff_t isize = inode->i_size; 121 122 if (pos + len > isize) { 123 truncate_pagecache(inode, pos + len, isize); 124 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 125 down_write(&iinfo->i_data_sem); 126 udf_truncate_extents(inode); 127 up_write(&iinfo->i_data_sem); 128 } 129 } 130 } 131 132 return ret; 133 } 134 135 static sector_t udf_bmap(struct address_space *mapping, sector_t block) 136 { 137 return generic_block_bmap(mapping, block, udf_get_block); 138 } 139 140 const struct address_space_operations udf_aops = { 141 .readpage = udf_readpage, 142 .writepage = udf_writepage, 143 .write_begin = udf_write_begin, 144 .write_end = generic_write_end, 145 .bmap = udf_bmap, 146 }; 147 148 int udf_expand_file_adinicb(struct inode *inode) 149 { 150 struct page *page; 151 char *kaddr; 152 struct udf_inode_info *iinfo = UDF_I(inode); 153 int err; 154 struct writeback_control udf_wbc = { 155 .sync_mode = WB_SYNC_NONE, 156 .nr_to_write = 1, 157 }; 158 159 if (!iinfo->i_lenAlloc) { 160 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 161 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; 162 else 163 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; 164 /* from now on we have normal address_space methods */ 165 inode->i_data.a_ops = &udf_aops; 166 mark_inode_dirty(inode); 167 return 0; 168 } 169 170 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS); 171 if (!page) 172 return -ENOMEM; 173 174 if (!PageUptodate(page)) { 175 kaddr = kmap(page); 176 memset(kaddr + iinfo->i_lenAlloc, 0x00, 177 PAGE_CACHE_SIZE - iinfo->i_lenAlloc); 178 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, 179 iinfo->i_lenAlloc); 180 flush_dcache_page(page); 181 SetPageUptodate(page); 182 kunmap(page); 183 } 184 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00, 185 iinfo->i_lenAlloc); 186 iinfo->i_lenAlloc = 0; 187 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 188 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; 189 else 190 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; 191 /* from now on we have normal address_space methods */ 192 inode->i_data.a_ops = &udf_aops; 193 err = inode->i_data.a_ops->writepage(page, &udf_wbc); 194 if (err) { 195 /* Restore everything back so that we don't lose data... */ 196 lock_page(page); 197 kaddr = kmap(page); 198 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, 199 inode->i_size); 200 kunmap(page); 201 unlock_page(page); 202 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; 203 inode->i_data.a_ops = &udf_adinicb_aops; 204 } 205 page_cache_release(page); 206 mark_inode_dirty(inode); 207 208 return err; 209 } 210 211 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block, 212 int *err) 213 { 214 int newblock; 215 struct buffer_head *dbh = NULL; 216 struct kernel_lb_addr eloc; 217 uint8_t alloctype; 218 struct extent_position epos; 219 220 struct udf_fileident_bh sfibh, dfibh; 221 loff_t f_pos = udf_ext0_offset(inode); 222 int size = udf_ext0_offset(inode) + inode->i_size; 223 struct fileIdentDesc cfi, *sfi, *dfi; 224 struct udf_inode_info *iinfo = UDF_I(inode); 225 226 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 227 alloctype = ICBTAG_FLAG_AD_SHORT; 228 else 229 alloctype = ICBTAG_FLAG_AD_LONG; 230 231 if (!inode->i_size) { 232 iinfo->i_alloc_type = alloctype; 233 mark_inode_dirty(inode); 234 return NULL; 235 } 236 237 /* alloc block, and copy data to it */ 238 *block = udf_new_block(inode->i_sb, inode, 239 iinfo->i_location.partitionReferenceNum, 240 iinfo->i_location.logicalBlockNum, err); 241 if (!(*block)) 242 return NULL; 243 newblock = udf_get_pblock(inode->i_sb, *block, 244 iinfo->i_location.partitionReferenceNum, 245 0); 246 if (!newblock) 247 return NULL; 248 dbh = udf_tgetblk(inode->i_sb, newblock); 249 if (!dbh) 250 return NULL; 251 lock_buffer(dbh); 252 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize); 253 set_buffer_uptodate(dbh); 254 unlock_buffer(dbh); 255 mark_buffer_dirty_inode(dbh, inode); 256 257 sfibh.soffset = sfibh.eoffset = 258 f_pos & (inode->i_sb->s_blocksize - 1); 259 sfibh.sbh = sfibh.ebh = NULL; 260 dfibh.soffset = dfibh.eoffset = 0; 261 dfibh.sbh = dfibh.ebh = dbh; 262 while (f_pos < size) { 263 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; 264 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, 265 NULL, NULL, NULL); 266 if (!sfi) { 267 brelse(dbh); 268 return NULL; 269 } 270 iinfo->i_alloc_type = alloctype; 271 sfi->descTag.tagLocation = cpu_to_le32(*block); 272 dfibh.soffset = dfibh.eoffset; 273 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset); 274 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset); 275 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse, 276 sfi->fileIdent + 277 le16_to_cpu(sfi->lengthOfImpUse))) { 278 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; 279 brelse(dbh); 280 return NULL; 281 } 282 } 283 mark_buffer_dirty_inode(dbh, inode); 284 285 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0, 286 iinfo->i_lenAlloc); 287 iinfo->i_lenAlloc = 0; 288 eloc.logicalBlockNum = *block; 289 eloc.partitionReferenceNum = 290 iinfo->i_location.partitionReferenceNum; 291 iinfo->i_lenExtents = inode->i_size; 292 epos.bh = NULL; 293 epos.block = iinfo->i_location; 294 epos.offset = udf_file_entry_alloc_offset(inode); 295 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 296 /* UniqueID stuff */ 297 298 brelse(epos.bh); 299 mark_inode_dirty(inode); 300 return dbh; 301 } 302 303 static int udf_get_block(struct inode *inode, sector_t block, 304 struct buffer_head *bh_result, int create) 305 { 306 int err, new; 307 struct buffer_head *bh; 308 sector_t phys = 0; 309 struct udf_inode_info *iinfo; 310 311 if (!create) { 312 phys = udf_block_map(inode, block); 313 if (phys) 314 map_bh(bh_result, inode->i_sb, phys); 315 return 0; 316 } 317 318 err = -EIO; 319 new = 0; 320 bh = NULL; 321 iinfo = UDF_I(inode); 322 323 down_write(&iinfo->i_data_sem); 324 if (block == iinfo->i_next_alloc_block + 1) { 325 iinfo->i_next_alloc_block++; 326 iinfo->i_next_alloc_goal++; 327 } 328 329 err = 0; 330 331 bh = inode_getblk(inode, block, &err, &phys, &new); 332 BUG_ON(bh); 333 if (err) 334 goto abort; 335 BUG_ON(!phys); 336 337 if (new) 338 set_buffer_new(bh_result); 339 map_bh(bh_result, inode->i_sb, phys); 340 341 abort: 342 up_write(&iinfo->i_data_sem); 343 return err; 344 } 345 346 static struct buffer_head *udf_getblk(struct inode *inode, long block, 347 int create, int *err) 348 { 349 struct buffer_head *bh; 350 struct buffer_head dummy; 351 352 dummy.b_state = 0; 353 dummy.b_blocknr = -1000; 354 *err = udf_get_block(inode, block, &dummy, create); 355 if (!*err && buffer_mapped(&dummy)) { 356 bh = sb_getblk(inode->i_sb, dummy.b_blocknr); 357 if (buffer_new(&dummy)) { 358 lock_buffer(bh); 359 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); 360 set_buffer_uptodate(bh); 361 unlock_buffer(bh); 362 mark_buffer_dirty_inode(bh, inode); 363 } 364 return bh; 365 } 366 367 return NULL; 368 } 369 370 /* Extend the file by 'blocks' blocks, return the number of extents added */ 371 static int udf_do_extend_file(struct inode *inode, 372 struct extent_position *last_pos, 373 struct kernel_long_ad *last_ext, 374 sector_t blocks) 375 { 376 sector_t add; 377 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 378 struct super_block *sb = inode->i_sb; 379 struct kernel_lb_addr prealloc_loc = {}; 380 int prealloc_len = 0; 381 struct udf_inode_info *iinfo; 382 int err; 383 384 /* The previous extent is fake and we should not extend by anything 385 * - there's nothing to do... */ 386 if (!blocks && fake) 387 return 0; 388 389 iinfo = UDF_I(inode); 390 /* Round the last extent up to a multiple of block size */ 391 if (last_ext->extLength & (sb->s_blocksize - 1)) { 392 last_ext->extLength = 393 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) | 394 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) + 395 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); 396 iinfo->i_lenExtents = 397 (iinfo->i_lenExtents + sb->s_blocksize - 1) & 398 ~(sb->s_blocksize - 1); 399 } 400 401 /* Last extent are just preallocated blocks? */ 402 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == 403 EXT_NOT_RECORDED_ALLOCATED) { 404 /* Save the extent so that we can reattach it to the end */ 405 prealloc_loc = last_ext->extLocation; 406 prealloc_len = last_ext->extLength; 407 /* Mark the extent as a hole */ 408 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 409 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); 410 last_ext->extLocation.logicalBlockNum = 0; 411 last_ext->extLocation.partitionReferenceNum = 0; 412 } 413 414 /* Can we merge with the previous extent? */ 415 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == 416 EXT_NOT_RECORDED_NOT_ALLOCATED) { 417 add = ((1 << 30) - sb->s_blocksize - 418 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >> 419 sb->s_blocksize_bits; 420 if (add > blocks) 421 add = blocks; 422 blocks -= add; 423 last_ext->extLength += add << sb->s_blocksize_bits; 424 } 425 426 if (fake) { 427 udf_add_aext(inode, last_pos, &last_ext->extLocation, 428 last_ext->extLength, 1); 429 count++; 430 } else 431 udf_write_aext(inode, last_pos, &last_ext->extLocation, 432 last_ext->extLength, 1); 433 434 /* Managed to do everything necessary? */ 435 if (!blocks) 436 goto out; 437 438 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */ 439 last_ext->extLocation.logicalBlockNum = 0; 440 last_ext->extLocation.partitionReferenceNum = 0; 441 add = (1 << (30-sb->s_blocksize_bits)) - 1; 442 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 443 (add << sb->s_blocksize_bits); 444 445 /* Create enough extents to cover the whole hole */ 446 while (blocks > add) { 447 blocks -= add; 448 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 449 last_ext->extLength, 1); 450 if (err) 451 return err; 452 count++; 453 } 454 if (blocks) { 455 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 456 (blocks << sb->s_blocksize_bits); 457 err = udf_add_aext(inode, last_pos, &last_ext->extLocation, 458 last_ext->extLength, 1); 459 if (err) 460 return err; 461 count++; 462 } 463 464 out: 465 /* Do we have some preallocated blocks saved? */ 466 if (prealloc_len) { 467 err = udf_add_aext(inode, last_pos, &prealloc_loc, 468 prealloc_len, 1); 469 if (err) 470 return err; 471 last_ext->extLocation = prealloc_loc; 472 last_ext->extLength = prealloc_len; 473 count++; 474 } 475 476 /* last_pos should point to the last written extent... */ 477 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 478 last_pos->offset -= sizeof(struct short_ad); 479 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 480 last_pos->offset -= sizeof(struct long_ad); 481 else 482 return -EIO; 483 484 return count; 485 } 486 487 static int udf_extend_file(struct inode *inode, loff_t newsize) 488 { 489 490 struct extent_position epos; 491 struct kernel_lb_addr eloc; 492 uint32_t elen; 493 int8_t etype; 494 struct super_block *sb = inode->i_sb; 495 sector_t first_block = newsize >> sb->s_blocksize_bits, offset; 496 int adsize; 497 struct udf_inode_info *iinfo = UDF_I(inode); 498 struct kernel_long_ad extent; 499 int err; 500 501 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 502 adsize = sizeof(struct short_ad); 503 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 504 adsize = sizeof(struct long_ad); 505 else 506 BUG(); 507 508 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset); 509 510 /* File has extent covering the new size (could happen when extending 511 * inside a block)? */ 512 if (etype != -1) 513 return 0; 514 if (newsize & (sb->s_blocksize - 1)) 515 offset++; 516 /* Extended file just to the boundary of the last file block? */ 517 if (offset == 0) 518 return 0; 519 520 /* Truncate is extending the file by 'offset' blocks */ 521 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) || 522 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) { 523 /* File has no extents at all or has empty last 524 * indirect extent! Create a fake extent... */ 525 extent.extLocation.logicalBlockNum = 0; 526 extent.extLocation.partitionReferenceNum = 0; 527 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 528 } else { 529 epos.offset -= adsize; 530 etype = udf_next_aext(inode, &epos, &extent.extLocation, 531 &extent.extLength, 0); 532 extent.extLength |= etype << 30; 533 } 534 err = udf_do_extend_file(inode, &epos, &extent, offset); 535 if (err < 0) 536 goto out; 537 err = 0; 538 iinfo->i_lenExtents = newsize; 539 out: 540 brelse(epos.bh); 541 return err; 542 } 543 544 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block, 545 int *err, sector_t *phys, int *new) 546 { 547 static sector_t last_block; 548 struct buffer_head *result = NULL; 549 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE]; 550 struct extent_position prev_epos, cur_epos, next_epos; 551 int count = 0, startnum = 0, endnum = 0; 552 uint32_t elen = 0, tmpelen; 553 struct kernel_lb_addr eloc, tmpeloc; 554 int c = 1; 555 loff_t lbcount = 0, b_off = 0; 556 uint32_t newblocknum, newblock; 557 sector_t offset = 0; 558 int8_t etype; 559 struct udf_inode_info *iinfo = UDF_I(inode); 560 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum; 561 int lastblock = 0; 562 563 prev_epos.offset = udf_file_entry_alloc_offset(inode); 564 prev_epos.block = iinfo->i_location; 565 prev_epos.bh = NULL; 566 cur_epos = next_epos = prev_epos; 567 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits; 568 569 /* find the extent which contains the block we are looking for. 570 alternate between laarr[0] and laarr[1] for locations of the 571 current extent, and the previous extent */ 572 do { 573 if (prev_epos.bh != cur_epos.bh) { 574 brelse(prev_epos.bh); 575 get_bh(cur_epos.bh); 576 prev_epos.bh = cur_epos.bh; 577 } 578 if (cur_epos.bh != next_epos.bh) { 579 brelse(cur_epos.bh); 580 get_bh(next_epos.bh); 581 cur_epos.bh = next_epos.bh; 582 } 583 584 lbcount += elen; 585 586 prev_epos.block = cur_epos.block; 587 cur_epos.block = next_epos.block; 588 589 prev_epos.offset = cur_epos.offset; 590 cur_epos.offset = next_epos.offset; 591 592 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1); 593 if (etype == -1) 594 break; 595 596 c = !c; 597 598 laarr[c].extLength = (etype << 30) | elen; 599 laarr[c].extLocation = eloc; 600 601 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 602 pgoal = eloc.logicalBlockNum + 603 ((elen + inode->i_sb->s_blocksize - 1) >> 604 inode->i_sb->s_blocksize_bits); 605 606 count++; 607 } while (lbcount + elen <= b_off); 608 609 b_off -= lbcount; 610 offset = b_off >> inode->i_sb->s_blocksize_bits; 611 /* 612 * Move prev_epos and cur_epos into indirect extent if we are at 613 * the pointer to it 614 */ 615 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0); 616 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0); 617 618 /* if the extent is allocated and recorded, return the block 619 if the extent is not a multiple of the blocksize, round up */ 620 621 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) { 622 if (elen & (inode->i_sb->s_blocksize - 1)) { 623 elen = EXT_RECORDED_ALLOCATED | 624 ((elen + inode->i_sb->s_blocksize - 1) & 625 ~(inode->i_sb->s_blocksize - 1)); 626 udf_write_aext(inode, &cur_epos, &eloc, elen, 1); 627 } 628 brelse(prev_epos.bh); 629 brelse(cur_epos.bh); 630 brelse(next_epos.bh); 631 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset); 632 *phys = newblock; 633 return NULL; 634 } 635 636 last_block = block; 637 /* Are we beyond EOF? */ 638 if (etype == -1) { 639 int ret; 640 641 if (count) { 642 if (c) 643 laarr[0] = laarr[1]; 644 startnum = 1; 645 } else { 646 /* Create a fake extent when there's not one */ 647 memset(&laarr[0].extLocation, 0x00, 648 sizeof(struct kernel_lb_addr)); 649 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; 650 /* Will udf_do_extend_file() create real extent from 651 a fake one? */ 652 startnum = (offset > 0); 653 } 654 /* Create extents for the hole between EOF and offset */ 655 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset); 656 if (ret < 0) { 657 brelse(prev_epos.bh); 658 brelse(cur_epos.bh); 659 brelse(next_epos.bh); 660 *err = ret; 661 return NULL; 662 } 663 c = 0; 664 offset = 0; 665 count += ret; 666 /* We are not covered by a preallocated extent? */ 667 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) != 668 EXT_NOT_RECORDED_ALLOCATED) { 669 /* Is there any real extent? - otherwise we overwrite 670 * the fake one... */ 671 if (count) 672 c = !c; 673 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | 674 inode->i_sb->s_blocksize; 675 memset(&laarr[c].extLocation, 0x00, 676 sizeof(struct kernel_lb_addr)); 677 count++; 678 endnum++; 679 } 680 endnum = c + 1; 681 lastblock = 1; 682 } else { 683 endnum = startnum = ((count > 2) ? 2 : count); 684 685 /* if the current extent is in position 0, 686 swap it with the previous */ 687 if (!c && count != 1) { 688 laarr[2] = laarr[0]; 689 laarr[0] = laarr[1]; 690 laarr[1] = laarr[2]; 691 c = 1; 692 } 693 694 /* if the current block is located in an extent, 695 read the next extent */ 696 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0); 697 if (etype != -1) { 698 laarr[c + 1].extLength = (etype << 30) | elen; 699 laarr[c + 1].extLocation = eloc; 700 count++; 701 startnum++; 702 endnum++; 703 } else 704 lastblock = 1; 705 } 706 707 /* if the current extent is not recorded but allocated, get the 708 * block in the extent corresponding to the requested block */ 709 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 710 newblocknum = laarr[c].extLocation.logicalBlockNum + offset; 711 else { /* otherwise, allocate a new block */ 712 if (iinfo->i_next_alloc_block == block) 713 goal = iinfo->i_next_alloc_goal; 714 715 if (!goal) { 716 if (!(goal = pgoal)) /* XXX: what was intended here? */ 717 goal = iinfo->i_location.logicalBlockNum + 1; 718 } 719 720 newblocknum = udf_new_block(inode->i_sb, inode, 721 iinfo->i_location.partitionReferenceNum, 722 goal, err); 723 if (!newblocknum) { 724 brelse(prev_epos.bh); 725 *err = -ENOSPC; 726 return NULL; 727 } 728 iinfo->i_lenExtents += inode->i_sb->s_blocksize; 729 } 730 731 /* if the extent the requsted block is located in contains multiple 732 * blocks, split the extent into at most three extents. blocks prior 733 * to requested block, requested block, and blocks after requested 734 * block */ 735 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum); 736 737 #ifdef UDF_PREALLOCATE 738 /* We preallocate blocks only for regular files. It also makes sense 739 * for directories but there's a problem when to drop the 740 * preallocation. We might use some delayed work for that but I feel 741 * it's overengineering for a filesystem like UDF. */ 742 if (S_ISREG(inode->i_mode)) 743 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); 744 #endif 745 746 /* merge any continuous blocks in laarr */ 747 udf_merge_extents(inode, laarr, &endnum); 748 749 /* write back the new extents, inserting new extents if the new number 750 * of extents is greater than the old number, and deleting extents if 751 * the new number of extents is less than the old number */ 752 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos); 753 754 brelse(prev_epos.bh); 755 756 newblock = udf_get_pblock(inode->i_sb, newblocknum, 757 iinfo->i_location.partitionReferenceNum, 0); 758 if (!newblock) 759 return NULL; 760 *phys = newblock; 761 *err = 0; 762 *new = 1; 763 iinfo->i_next_alloc_block = block; 764 iinfo->i_next_alloc_goal = newblocknum; 765 inode->i_ctime = current_fs_time(inode->i_sb); 766 767 if (IS_SYNC(inode)) 768 udf_sync_inode(inode); 769 else 770 mark_inode_dirty(inode); 771 772 return result; 773 } 774 775 static void udf_split_extents(struct inode *inode, int *c, int offset, 776 int newblocknum, 777 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], 778 int *endnum) 779 { 780 unsigned long blocksize = inode->i_sb->s_blocksize; 781 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 782 783 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) || 784 (laarr[*c].extLength >> 30) == 785 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 786 int curr = *c; 787 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) + 788 blocksize - 1) >> blocksize_bits; 789 int8_t etype = (laarr[curr].extLength >> 30); 790 791 if (blen == 1) 792 ; 793 else if (!offset || blen == offset + 1) { 794 laarr[curr + 2] = laarr[curr + 1]; 795 laarr[curr + 1] = laarr[curr]; 796 } else { 797 laarr[curr + 3] = laarr[curr + 1]; 798 laarr[curr + 2] = laarr[curr + 1] = laarr[curr]; 799 } 800 801 if (offset) { 802 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 803 udf_free_blocks(inode->i_sb, inode, 804 &laarr[curr].extLocation, 805 0, offset); 806 laarr[curr].extLength = 807 EXT_NOT_RECORDED_NOT_ALLOCATED | 808 (offset << blocksize_bits); 809 laarr[curr].extLocation.logicalBlockNum = 0; 810 laarr[curr].extLocation. 811 partitionReferenceNum = 0; 812 } else 813 laarr[curr].extLength = (etype << 30) | 814 (offset << blocksize_bits); 815 curr++; 816 (*c)++; 817 (*endnum)++; 818 } 819 820 laarr[curr].extLocation.logicalBlockNum = newblocknum; 821 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) 822 laarr[curr].extLocation.partitionReferenceNum = 823 UDF_I(inode)->i_location.partitionReferenceNum; 824 laarr[curr].extLength = EXT_RECORDED_ALLOCATED | 825 blocksize; 826 curr++; 827 828 if (blen != offset + 1) { 829 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) 830 laarr[curr].extLocation.logicalBlockNum += 831 offset + 1; 832 laarr[curr].extLength = (etype << 30) | 833 ((blen - (offset + 1)) << blocksize_bits); 834 curr++; 835 (*endnum)++; 836 } 837 } 838 } 839 840 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock, 841 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], 842 int *endnum) 843 { 844 int start, length = 0, currlength = 0, i; 845 846 if (*endnum >= (c + 1)) { 847 if (!lastblock) 848 return; 849 else 850 start = c; 851 } else { 852 if ((laarr[c + 1].extLength >> 30) == 853 (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 854 start = c + 1; 855 length = currlength = 856 (((laarr[c + 1].extLength & 857 UDF_EXTENT_LENGTH_MASK) + 858 inode->i_sb->s_blocksize - 1) >> 859 inode->i_sb->s_blocksize_bits); 860 } else 861 start = c; 862 } 863 864 for (i = start + 1; i <= *endnum; i++) { 865 if (i == *endnum) { 866 if (lastblock) 867 length += UDF_DEFAULT_PREALLOC_BLOCKS; 868 } else if ((laarr[i].extLength >> 30) == 869 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { 870 length += (((laarr[i].extLength & 871 UDF_EXTENT_LENGTH_MASK) + 872 inode->i_sb->s_blocksize - 1) >> 873 inode->i_sb->s_blocksize_bits); 874 } else 875 break; 876 } 877 878 if (length) { 879 int next = laarr[start].extLocation.logicalBlockNum + 880 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) + 881 inode->i_sb->s_blocksize - 1) >> 882 inode->i_sb->s_blocksize_bits); 883 int numalloc = udf_prealloc_blocks(inode->i_sb, inode, 884 laarr[start].extLocation.partitionReferenceNum, 885 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? 886 length : UDF_DEFAULT_PREALLOC_BLOCKS) - 887 currlength); 888 if (numalloc) { 889 if (start == (c + 1)) 890 laarr[start].extLength += 891 (numalloc << 892 inode->i_sb->s_blocksize_bits); 893 else { 894 memmove(&laarr[c + 2], &laarr[c + 1], 895 sizeof(struct long_ad) * (*endnum - (c + 1))); 896 (*endnum)++; 897 laarr[c + 1].extLocation.logicalBlockNum = next; 898 laarr[c + 1].extLocation.partitionReferenceNum = 899 laarr[c].extLocation. 900 partitionReferenceNum; 901 laarr[c + 1].extLength = 902 EXT_NOT_RECORDED_ALLOCATED | 903 (numalloc << 904 inode->i_sb->s_blocksize_bits); 905 start = c + 1; 906 } 907 908 for (i = start + 1; numalloc && i < *endnum; i++) { 909 int elen = ((laarr[i].extLength & 910 UDF_EXTENT_LENGTH_MASK) + 911 inode->i_sb->s_blocksize - 1) >> 912 inode->i_sb->s_blocksize_bits; 913 914 if (elen > numalloc) { 915 laarr[i].extLength -= 916 (numalloc << 917 inode->i_sb->s_blocksize_bits); 918 numalloc = 0; 919 } else { 920 numalloc -= elen; 921 if (*endnum > (i + 1)) 922 memmove(&laarr[i], 923 &laarr[i + 1], 924 sizeof(struct long_ad) * 925 (*endnum - (i + 1))); 926 i--; 927 (*endnum)--; 928 } 929 } 930 UDF_I(inode)->i_lenExtents += 931 numalloc << inode->i_sb->s_blocksize_bits; 932 } 933 } 934 } 935 936 static void udf_merge_extents(struct inode *inode, 937 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], 938 int *endnum) 939 { 940 int i; 941 unsigned long blocksize = inode->i_sb->s_blocksize; 942 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 943 944 for (i = 0; i < (*endnum - 1); i++) { 945 struct kernel_long_ad *li /*l[i]*/ = &laarr[i]; 946 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1]; 947 948 if (((li->extLength >> 30) == (lip1->extLength >> 30)) && 949 (((li->extLength >> 30) == 950 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) || 951 ((lip1->extLocation.logicalBlockNum - 952 li->extLocation.logicalBlockNum) == 953 (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 954 blocksize - 1) >> blocksize_bits)))) { 955 956 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 957 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + 958 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { 959 lip1->extLength = (lip1->extLength - 960 (li->extLength & 961 UDF_EXTENT_LENGTH_MASK) + 962 UDF_EXTENT_LENGTH_MASK) & 963 ~(blocksize - 1); 964 li->extLength = (li->extLength & 965 UDF_EXTENT_FLAG_MASK) + 966 (UDF_EXTENT_LENGTH_MASK + 1) - 967 blocksize; 968 lip1->extLocation.logicalBlockNum = 969 li->extLocation.logicalBlockNum + 970 ((li->extLength & 971 UDF_EXTENT_LENGTH_MASK) >> 972 blocksize_bits); 973 } else { 974 li->extLength = lip1->extLength + 975 (((li->extLength & 976 UDF_EXTENT_LENGTH_MASK) + 977 blocksize - 1) & ~(blocksize - 1)); 978 if (*endnum > (i + 2)) 979 memmove(&laarr[i + 1], &laarr[i + 2], 980 sizeof(struct long_ad) * 981 (*endnum - (i + 2))); 982 i--; 983 (*endnum)--; 984 } 985 } else if (((li->extLength >> 30) == 986 (EXT_NOT_RECORDED_ALLOCATED >> 30)) && 987 ((lip1->extLength >> 30) == 988 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) { 989 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0, 990 ((li->extLength & 991 UDF_EXTENT_LENGTH_MASK) + 992 blocksize - 1) >> blocksize_bits); 993 li->extLocation.logicalBlockNum = 0; 994 li->extLocation.partitionReferenceNum = 0; 995 996 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + 997 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + 998 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { 999 lip1->extLength = (lip1->extLength - 1000 (li->extLength & 1001 UDF_EXTENT_LENGTH_MASK) + 1002 UDF_EXTENT_LENGTH_MASK) & 1003 ~(blocksize - 1); 1004 li->extLength = (li->extLength & 1005 UDF_EXTENT_FLAG_MASK) + 1006 (UDF_EXTENT_LENGTH_MASK + 1) - 1007 blocksize; 1008 } else { 1009 li->extLength = lip1->extLength + 1010 (((li->extLength & 1011 UDF_EXTENT_LENGTH_MASK) + 1012 blocksize - 1) & ~(blocksize - 1)); 1013 if (*endnum > (i + 2)) 1014 memmove(&laarr[i + 1], &laarr[i + 2], 1015 sizeof(struct long_ad) * 1016 (*endnum - (i + 2))); 1017 i--; 1018 (*endnum)--; 1019 } 1020 } else if ((li->extLength >> 30) == 1021 (EXT_NOT_RECORDED_ALLOCATED >> 30)) { 1022 udf_free_blocks(inode->i_sb, inode, 1023 &li->extLocation, 0, 1024 ((li->extLength & 1025 UDF_EXTENT_LENGTH_MASK) + 1026 blocksize - 1) >> blocksize_bits); 1027 li->extLocation.logicalBlockNum = 0; 1028 li->extLocation.partitionReferenceNum = 0; 1029 li->extLength = (li->extLength & 1030 UDF_EXTENT_LENGTH_MASK) | 1031 EXT_NOT_RECORDED_NOT_ALLOCATED; 1032 } 1033 } 1034 } 1035 1036 static void udf_update_extents(struct inode *inode, 1037 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], 1038 int startnum, int endnum, 1039 struct extent_position *epos) 1040 { 1041 int start = 0, i; 1042 struct kernel_lb_addr tmploc; 1043 uint32_t tmplen; 1044 1045 if (startnum > endnum) { 1046 for (i = 0; i < (startnum - endnum); i++) 1047 udf_delete_aext(inode, *epos, laarr[i].extLocation, 1048 laarr[i].extLength); 1049 } else if (startnum < endnum) { 1050 for (i = 0; i < (endnum - startnum); i++) { 1051 udf_insert_aext(inode, *epos, laarr[i].extLocation, 1052 laarr[i].extLength); 1053 udf_next_aext(inode, epos, &laarr[i].extLocation, 1054 &laarr[i].extLength, 1); 1055 start++; 1056 } 1057 } 1058 1059 for (i = start; i < endnum; i++) { 1060 udf_next_aext(inode, epos, &tmploc, &tmplen, 0); 1061 udf_write_aext(inode, epos, &laarr[i].extLocation, 1062 laarr[i].extLength, 1); 1063 } 1064 } 1065 1066 struct buffer_head *udf_bread(struct inode *inode, int block, 1067 int create, int *err) 1068 { 1069 struct buffer_head *bh = NULL; 1070 1071 bh = udf_getblk(inode, block, create, err); 1072 if (!bh) 1073 return NULL; 1074 1075 if (buffer_uptodate(bh)) 1076 return bh; 1077 1078 ll_rw_block(READ, 1, &bh); 1079 1080 wait_on_buffer(bh); 1081 if (buffer_uptodate(bh)) 1082 return bh; 1083 1084 brelse(bh); 1085 *err = -EIO; 1086 return NULL; 1087 } 1088 1089 int udf_setsize(struct inode *inode, loff_t newsize) 1090 { 1091 int err; 1092 struct udf_inode_info *iinfo; 1093 int bsize = 1 << inode->i_blkbits; 1094 1095 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 1096 S_ISLNK(inode->i_mode))) 1097 return -EINVAL; 1098 if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) 1099 return -EPERM; 1100 1101 iinfo = UDF_I(inode); 1102 if (newsize > inode->i_size) { 1103 down_write(&iinfo->i_data_sem); 1104 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1105 if (bsize < 1106 (udf_file_entry_alloc_offset(inode) + newsize)) { 1107 err = udf_expand_file_adinicb(inode); 1108 if (err) { 1109 up_write(&iinfo->i_data_sem); 1110 return err; 1111 } 1112 } else 1113 iinfo->i_lenAlloc = newsize; 1114 } 1115 err = udf_extend_file(inode, newsize); 1116 if (err) { 1117 up_write(&iinfo->i_data_sem); 1118 return err; 1119 } 1120 truncate_setsize(inode, newsize); 1121 up_write(&iinfo->i_data_sem); 1122 } else { 1123 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1124 down_write(&iinfo->i_data_sem); 1125 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize, 1126 0x00, bsize - newsize - 1127 udf_file_entry_alloc_offset(inode)); 1128 iinfo->i_lenAlloc = newsize; 1129 truncate_setsize(inode, newsize); 1130 up_write(&iinfo->i_data_sem); 1131 goto update_time; 1132 } 1133 err = block_truncate_page(inode->i_mapping, newsize, 1134 udf_get_block); 1135 if (err) 1136 return err; 1137 down_write(&iinfo->i_data_sem); 1138 truncate_setsize(inode, newsize); 1139 udf_truncate_extents(inode); 1140 up_write(&iinfo->i_data_sem); 1141 } 1142 update_time: 1143 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); 1144 if (IS_SYNC(inode)) 1145 udf_sync_inode(inode); 1146 else 1147 mark_inode_dirty(inode); 1148 return 0; 1149 } 1150 1151 static void __udf_read_inode(struct inode *inode) 1152 { 1153 struct buffer_head *bh = NULL; 1154 struct fileEntry *fe; 1155 uint16_t ident; 1156 struct udf_inode_info *iinfo = UDF_I(inode); 1157 1158 /* 1159 * Set defaults, but the inode is still incomplete! 1160 * Note: get_new_inode() sets the following on a new inode: 1161 * i_sb = sb 1162 * i_no = ino 1163 * i_flags = sb->s_flags 1164 * i_state = 0 1165 * clean_inode(): zero fills and sets 1166 * i_count = 1 1167 * i_nlink = 1 1168 * i_op = NULL; 1169 */ 1170 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident); 1171 if (!bh) { 1172 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n", 1173 inode->i_ino); 1174 make_bad_inode(inode); 1175 return; 1176 } 1177 1178 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE && 1179 ident != TAG_IDENT_USE) { 1180 printk(KERN_ERR "udf: udf_read_inode(ino %ld) " 1181 "failed ident=%d\n", inode->i_ino, ident); 1182 brelse(bh); 1183 make_bad_inode(inode); 1184 return; 1185 } 1186 1187 fe = (struct fileEntry *)bh->b_data; 1188 1189 if (fe->icbTag.strategyType == cpu_to_le16(4096)) { 1190 struct buffer_head *ibh; 1191 1192 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1, 1193 &ident); 1194 if (ident == TAG_IDENT_IE && ibh) { 1195 struct buffer_head *nbh = NULL; 1196 struct kernel_lb_addr loc; 1197 struct indirectEntry *ie; 1198 1199 ie = (struct indirectEntry *)ibh->b_data; 1200 loc = lelb_to_cpu(ie->indirectICB.extLocation); 1201 1202 if (ie->indirectICB.extLength && 1203 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0, 1204 &ident))) { 1205 if (ident == TAG_IDENT_FE || 1206 ident == TAG_IDENT_EFE) { 1207 memcpy(&iinfo->i_location, 1208 &loc, 1209 sizeof(struct kernel_lb_addr)); 1210 brelse(bh); 1211 brelse(ibh); 1212 brelse(nbh); 1213 __udf_read_inode(inode); 1214 return; 1215 } 1216 brelse(nbh); 1217 } 1218 } 1219 brelse(ibh); 1220 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) { 1221 printk(KERN_ERR "udf: unsupported strategy type: %d\n", 1222 le16_to_cpu(fe->icbTag.strategyType)); 1223 brelse(bh); 1224 make_bad_inode(inode); 1225 return; 1226 } 1227 udf_fill_inode(inode, bh); 1228 1229 brelse(bh); 1230 } 1231 1232 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh) 1233 { 1234 struct fileEntry *fe; 1235 struct extendedFileEntry *efe; 1236 int offset; 1237 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1238 struct udf_inode_info *iinfo = UDF_I(inode); 1239 1240 fe = (struct fileEntry *)bh->b_data; 1241 efe = (struct extendedFileEntry *)bh->b_data; 1242 1243 if (fe->icbTag.strategyType == cpu_to_le16(4)) 1244 iinfo->i_strat4096 = 0; 1245 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */ 1246 iinfo->i_strat4096 = 1; 1247 1248 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) & 1249 ICBTAG_FLAG_AD_MASK; 1250 iinfo->i_unique = 0; 1251 iinfo->i_lenEAttr = 0; 1252 iinfo->i_lenExtents = 0; 1253 iinfo->i_lenAlloc = 0; 1254 iinfo->i_next_alloc_block = 0; 1255 iinfo->i_next_alloc_goal = 0; 1256 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) { 1257 iinfo->i_efe = 1; 1258 iinfo->i_use = 0; 1259 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - 1260 sizeof(struct extendedFileEntry))) { 1261 make_bad_inode(inode); 1262 return; 1263 } 1264 memcpy(iinfo->i_ext.i_data, 1265 bh->b_data + sizeof(struct extendedFileEntry), 1266 inode->i_sb->s_blocksize - 1267 sizeof(struct extendedFileEntry)); 1268 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) { 1269 iinfo->i_efe = 0; 1270 iinfo->i_use = 0; 1271 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - 1272 sizeof(struct fileEntry))) { 1273 make_bad_inode(inode); 1274 return; 1275 } 1276 memcpy(iinfo->i_ext.i_data, 1277 bh->b_data + sizeof(struct fileEntry), 1278 inode->i_sb->s_blocksize - sizeof(struct fileEntry)); 1279 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) { 1280 iinfo->i_efe = 0; 1281 iinfo->i_use = 1; 1282 iinfo->i_lenAlloc = le32_to_cpu( 1283 ((struct unallocSpaceEntry *)bh->b_data)-> 1284 lengthAllocDescs); 1285 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - 1286 sizeof(struct unallocSpaceEntry))) { 1287 make_bad_inode(inode); 1288 return; 1289 } 1290 memcpy(iinfo->i_ext.i_data, 1291 bh->b_data + sizeof(struct unallocSpaceEntry), 1292 inode->i_sb->s_blocksize - 1293 sizeof(struct unallocSpaceEntry)); 1294 return; 1295 } 1296 1297 read_lock(&sbi->s_cred_lock); 1298 inode->i_uid = le32_to_cpu(fe->uid); 1299 if (inode->i_uid == -1 || 1300 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) || 1301 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET)) 1302 inode->i_uid = UDF_SB(inode->i_sb)->s_uid; 1303 1304 inode->i_gid = le32_to_cpu(fe->gid); 1305 if (inode->i_gid == -1 || 1306 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) || 1307 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET)) 1308 inode->i_gid = UDF_SB(inode->i_sb)->s_gid; 1309 1310 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY && 1311 sbi->s_fmode != UDF_INVALID_MODE) 1312 inode->i_mode = sbi->s_fmode; 1313 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY && 1314 sbi->s_dmode != UDF_INVALID_MODE) 1315 inode->i_mode = sbi->s_dmode; 1316 else 1317 inode->i_mode = udf_convert_permissions(fe); 1318 inode->i_mode &= ~sbi->s_umask; 1319 read_unlock(&sbi->s_cred_lock); 1320 1321 inode->i_nlink = le16_to_cpu(fe->fileLinkCount); 1322 if (!inode->i_nlink) 1323 inode->i_nlink = 1; 1324 1325 inode->i_size = le64_to_cpu(fe->informationLength); 1326 iinfo->i_lenExtents = inode->i_size; 1327 1328 if (iinfo->i_efe == 0) { 1329 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) << 1330 (inode->i_sb->s_blocksize_bits - 9); 1331 1332 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime)) 1333 inode->i_atime = sbi->s_record_time; 1334 1335 if (!udf_disk_stamp_to_time(&inode->i_mtime, 1336 fe->modificationTime)) 1337 inode->i_mtime = sbi->s_record_time; 1338 1339 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime)) 1340 inode->i_ctime = sbi->s_record_time; 1341 1342 iinfo->i_unique = le64_to_cpu(fe->uniqueID); 1343 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr); 1344 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs); 1345 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr; 1346 } else { 1347 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << 1348 (inode->i_sb->s_blocksize_bits - 9); 1349 1350 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime)) 1351 inode->i_atime = sbi->s_record_time; 1352 1353 if (!udf_disk_stamp_to_time(&inode->i_mtime, 1354 efe->modificationTime)) 1355 inode->i_mtime = sbi->s_record_time; 1356 1357 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime)) 1358 iinfo->i_crtime = sbi->s_record_time; 1359 1360 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime)) 1361 inode->i_ctime = sbi->s_record_time; 1362 1363 iinfo->i_unique = le64_to_cpu(efe->uniqueID); 1364 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr); 1365 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs); 1366 offset = sizeof(struct extendedFileEntry) + 1367 iinfo->i_lenEAttr; 1368 } 1369 1370 switch (fe->icbTag.fileType) { 1371 case ICBTAG_FILE_TYPE_DIRECTORY: 1372 inode->i_op = &udf_dir_inode_operations; 1373 inode->i_fop = &udf_dir_operations; 1374 inode->i_mode |= S_IFDIR; 1375 inc_nlink(inode); 1376 break; 1377 case ICBTAG_FILE_TYPE_REALTIME: 1378 case ICBTAG_FILE_TYPE_REGULAR: 1379 case ICBTAG_FILE_TYPE_UNDEF: 1380 case ICBTAG_FILE_TYPE_VAT20: 1381 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1382 inode->i_data.a_ops = &udf_adinicb_aops; 1383 else 1384 inode->i_data.a_ops = &udf_aops; 1385 inode->i_op = &udf_file_inode_operations; 1386 inode->i_fop = &udf_file_operations; 1387 inode->i_mode |= S_IFREG; 1388 break; 1389 case ICBTAG_FILE_TYPE_BLOCK: 1390 inode->i_mode |= S_IFBLK; 1391 break; 1392 case ICBTAG_FILE_TYPE_CHAR: 1393 inode->i_mode |= S_IFCHR; 1394 break; 1395 case ICBTAG_FILE_TYPE_FIFO: 1396 init_special_inode(inode, inode->i_mode | S_IFIFO, 0); 1397 break; 1398 case ICBTAG_FILE_TYPE_SOCKET: 1399 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0); 1400 break; 1401 case ICBTAG_FILE_TYPE_SYMLINK: 1402 inode->i_data.a_ops = &udf_symlink_aops; 1403 inode->i_op = &udf_symlink_inode_operations; 1404 inode->i_mode = S_IFLNK | S_IRWXUGO; 1405 break; 1406 case ICBTAG_FILE_TYPE_MAIN: 1407 udf_debug("METADATA FILE-----\n"); 1408 break; 1409 case ICBTAG_FILE_TYPE_MIRROR: 1410 udf_debug("METADATA MIRROR FILE-----\n"); 1411 break; 1412 case ICBTAG_FILE_TYPE_BITMAP: 1413 udf_debug("METADATA BITMAP FILE-----\n"); 1414 break; 1415 default: 1416 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown " 1417 "file type=%d\n", inode->i_ino, 1418 fe->icbTag.fileType); 1419 make_bad_inode(inode); 1420 return; 1421 } 1422 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1423 struct deviceSpec *dsea = 1424 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1425 if (dsea) { 1426 init_special_inode(inode, inode->i_mode, 1427 MKDEV(le32_to_cpu(dsea->majorDeviceIdent), 1428 le32_to_cpu(dsea->minorDeviceIdent))); 1429 /* Developer ID ??? */ 1430 } else 1431 make_bad_inode(inode); 1432 } 1433 } 1434 1435 static int udf_alloc_i_data(struct inode *inode, size_t size) 1436 { 1437 struct udf_inode_info *iinfo = UDF_I(inode); 1438 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL); 1439 1440 if (!iinfo->i_ext.i_data) { 1441 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) " 1442 "no free memory\n", inode->i_ino); 1443 return -ENOMEM; 1444 } 1445 1446 return 0; 1447 } 1448 1449 static mode_t udf_convert_permissions(struct fileEntry *fe) 1450 { 1451 mode_t mode; 1452 uint32_t permissions; 1453 uint32_t flags; 1454 1455 permissions = le32_to_cpu(fe->permissions); 1456 flags = le16_to_cpu(fe->icbTag.flags); 1457 1458 mode = ((permissions) & S_IRWXO) | 1459 ((permissions >> 2) & S_IRWXG) | 1460 ((permissions >> 4) & S_IRWXU) | 1461 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) | 1462 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) | 1463 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0); 1464 1465 return mode; 1466 } 1467 1468 int udf_write_inode(struct inode *inode, struct writeback_control *wbc) 1469 { 1470 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1471 } 1472 1473 static int udf_sync_inode(struct inode *inode) 1474 { 1475 return udf_update_inode(inode, 1); 1476 } 1477 1478 static int udf_update_inode(struct inode *inode, int do_sync) 1479 { 1480 struct buffer_head *bh = NULL; 1481 struct fileEntry *fe; 1482 struct extendedFileEntry *efe; 1483 uint32_t udfperms; 1484 uint16_t icbflags; 1485 uint16_t crclen; 1486 int err = 0; 1487 struct udf_sb_info *sbi = UDF_SB(inode->i_sb); 1488 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 1489 struct udf_inode_info *iinfo = UDF_I(inode); 1490 1491 bh = udf_tgetblk(inode->i_sb, 1492 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0)); 1493 if (!bh) { 1494 udf_debug("getblk failure\n"); 1495 return -ENOMEM; 1496 } 1497 1498 lock_buffer(bh); 1499 memset(bh->b_data, 0, inode->i_sb->s_blocksize); 1500 fe = (struct fileEntry *)bh->b_data; 1501 efe = (struct extendedFileEntry *)bh->b_data; 1502 1503 if (iinfo->i_use) { 1504 struct unallocSpaceEntry *use = 1505 (struct unallocSpaceEntry *)bh->b_data; 1506 1507 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1508 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), 1509 iinfo->i_ext.i_data, inode->i_sb->s_blocksize - 1510 sizeof(struct unallocSpaceEntry)); 1511 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE); 1512 use->descTag.tagLocation = 1513 cpu_to_le32(iinfo->i_location.logicalBlockNum); 1514 crclen = sizeof(struct unallocSpaceEntry) + 1515 iinfo->i_lenAlloc - sizeof(struct tag); 1516 use->descTag.descCRCLength = cpu_to_le16(crclen); 1517 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use + 1518 sizeof(struct tag), 1519 crclen)); 1520 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag); 1521 1522 goto out; 1523 } 1524 1525 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET)) 1526 fe->uid = cpu_to_le32(-1); 1527 else 1528 fe->uid = cpu_to_le32(inode->i_uid); 1529 1530 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET)) 1531 fe->gid = cpu_to_le32(-1); 1532 else 1533 fe->gid = cpu_to_le32(inode->i_gid); 1534 1535 udfperms = ((inode->i_mode & S_IRWXO)) | 1536 ((inode->i_mode & S_IRWXG) << 2) | 1537 ((inode->i_mode & S_IRWXU) << 4); 1538 1539 udfperms |= (le32_to_cpu(fe->permissions) & 1540 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR | 1541 FE_PERM_G_DELETE | FE_PERM_G_CHATTR | 1542 FE_PERM_U_DELETE | FE_PERM_U_CHATTR)); 1543 fe->permissions = cpu_to_le32(udfperms); 1544 1545 if (S_ISDIR(inode->i_mode)) 1546 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1); 1547 else 1548 fe->fileLinkCount = cpu_to_le16(inode->i_nlink); 1549 1550 fe->informationLength = cpu_to_le64(inode->i_size); 1551 1552 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1553 struct regid *eid; 1554 struct deviceSpec *dsea = 1555 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); 1556 if (!dsea) { 1557 dsea = (struct deviceSpec *) 1558 udf_add_extendedattr(inode, 1559 sizeof(struct deviceSpec) + 1560 sizeof(struct regid), 12, 0x3); 1561 dsea->attrType = cpu_to_le32(12); 1562 dsea->attrSubtype = 1; 1563 dsea->attrLength = cpu_to_le32( 1564 sizeof(struct deviceSpec) + 1565 sizeof(struct regid)); 1566 dsea->impUseLength = cpu_to_le32(sizeof(struct regid)); 1567 } 1568 eid = (struct regid *)dsea->impUse; 1569 memset(eid, 0, sizeof(struct regid)); 1570 strcpy(eid->ident, UDF_ID_DEVELOPER); 1571 eid->identSuffix[0] = UDF_OS_CLASS_UNIX; 1572 eid->identSuffix[1] = UDF_OS_ID_LINUX; 1573 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode)); 1574 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode)); 1575 } 1576 1577 if (iinfo->i_efe == 0) { 1578 memcpy(bh->b_data + sizeof(struct fileEntry), 1579 iinfo->i_ext.i_data, 1580 inode->i_sb->s_blocksize - sizeof(struct fileEntry)); 1581 fe->logicalBlocksRecorded = cpu_to_le64( 1582 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >> 1583 (blocksize_bits - 9)); 1584 1585 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime); 1586 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime); 1587 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime); 1588 memset(&(fe->impIdent), 0, sizeof(struct regid)); 1589 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER); 1590 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1591 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1592 fe->uniqueID = cpu_to_le64(iinfo->i_unique); 1593 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); 1594 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1595 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE); 1596 crclen = sizeof(struct fileEntry); 1597 } else { 1598 memcpy(bh->b_data + sizeof(struct extendedFileEntry), 1599 iinfo->i_ext.i_data, 1600 inode->i_sb->s_blocksize - 1601 sizeof(struct extendedFileEntry)); 1602 efe->objectSize = cpu_to_le64(inode->i_size); 1603 efe->logicalBlocksRecorded = cpu_to_le64( 1604 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >> 1605 (blocksize_bits - 9)); 1606 1607 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec || 1608 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec && 1609 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec)) 1610 iinfo->i_crtime = inode->i_atime; 1611 1612 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec || 1613 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec && 1614 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec)) 1615 iinfo->i_crtime = inode->i_mtime; 1616 1617 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec || 1618 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec && 1619 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec)) 1620 iinfo->i_crtime = inode->i_ctime; 1621 1622 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime); 1623 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime); 1624 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime); 1625 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime); 1626 1627 memset(&(efe->impIdent), 0, sizeof(struct regid)); 1628 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER); 1629 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; 1630 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; 1631 efe->uniqueID = cpu_to_le64(iinfo->i_unique); 1632 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); 1633 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); 1634 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE); 1635 crclen = sizeof(struct extendedFileEntry); 1636 } 1637 if (iinfo->i_strat4096) { 1638 fe->icbTag.strategyType = cpu_to_le16(4096); 1639 fe->icbTag.strategyParameter = cpu_to_le16(1); 1640 fe->icbTag.numEntries = cpu_to_le16(2); 1641 } else { 1642 fe->icbTag.strategyType = cpu_to_le16(4); 1643 fe->icbTag.numEntries = cpu_to_le16(1); 1644 } 1645 1646 if (S_ISDIR(inode->i_mode)) 1647 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY; 1648 else if (S_ISREG(inode->i_mode)) 1649 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR; 1650 else if (S_ISLNK(inode->i_mode)) 1651 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK; 1652 else if (S_ISBLK(inode->i_mode)) 1653 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK; 1654 else if (S_ISCHR(inode->i_mode)) 1655 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR; 1656 else if (S_ISFIFO(inode->i_mode)) 1657 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO; 1658 else if (S_ISSOCK(inode->i_mode)) 1659 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET; 1660 1661 icbflags = iinfo->i_alloc_type | 1662 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) | 1663 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) | 1664 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) | 1665 (le16_to_cpu(fe->icbTag.flags) & 1666 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID | 1667 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY)); 1668 1669 fe->icbTag.flags = cpu_to_le16(icbflags); 1670 if (sbi->s_udfrev >= 0x0200) 1671 fe->descTag.descVersion = cpu_to_le16(3); 1672 else 1673 fe->descTag.descVersion = cpu_to_le16(2); 1674 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number); 1675 fe->descTag.tagLocation = cpu_to_le32( 1676 iinfo->i_location.logicalBlockNum); 1677 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag); 1678 fe->descTag.descCRCLength = cpu_to_le16(crclen); 1679 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag), 1680 crclen)); 1681 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag); 1682 1683 out: 1684 set_buffer_uptodate(bh); 1685 unlock_buffer(bh); 1686 1687 /* write the data blocks */ 1688 mark_buffer_dirty(bh); 1689 if (do_sync) { 1690 sync_dirty_buffer(bh); 1691 if (buffer_write_io_error(bh)) { 1692 printk(KERN_WARNING "IO error syncing udf inode " 1693 "[%s:%08lx]\n", inode->i_sb->s_id, 1694 inode->i_ino); 1695 err = -EIO; 1696 } 1697 } 1698 brelse(bh); 1699 1700 return err; 1701 } 1702 1703 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino) 1704 { 1705 unsigned long block = udf_get_lb_pblock(sb, ino, 0); 1706 struct inode *inode = iget_locked(sb, block); 1707 1708 if (!inode) 1709 return NULL; 1710 1711 if (inode->i_state & I_NEW) { 1712 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr)); 1713 __udf_read_inode(inode); 1714 unlock_new_inode(inode); 1715 } 1716 1717 if (is_bad_inode(inode)) 1718 goto out_iput; 1719 1720 if (ino->logicalBlockNum >= UDF_SB(sb)-> 1721 s_partmaps[ino->partitionReferenceNum].s_partition_len) { 1722 udf_debug("block=%d, partition=%d out of range\n", 1723 ino->logicalBlockNum, ino->partitionReferenceNum); 1724 make_bad_inode(inode); 1725 goto out_iput; 1726 } 1727 1728 return inode; 1729 1730 out_iput: 1731 iput(inode); 1732 return NULL; 1733 } 1734 1735 int udf_add_aext(struct inode *inode, struct extent_position *epos, 1736 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 1737 { 1738 int adsize; 1739 struct short_ad *sad = NULL; 1740 struct long_ad *lad = NULL; 1741 struct allocExtDesc *aed; 1742 uint8_t *ptr; 1743 struct udf_inode_info *iinfo = UDF_I(inode); 1744 1745 if (!epos->bh) 1746 ptr = iinfo->i_ext.i_data + epos->offset - 1747 udf_file_entry_alloc_offset(inode) + 1748 iinfo->i_lenEAttr; 1749 else 1750 ptr = epos->bh->b_data + epos->offset; 1751 1752 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 1753 adsize = sizeof(struct short_ad); 1754 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 1755 adsize = sizeof(struct long_ad); 1756 else 1757 return -EIO; 1758 1759 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) { 1760 unsigned char *sptr, *dptr; 1761 struct buffer_head *nbh; 1762 int err, loffset; 1763 struct kernel_lb_addr obloc = epos->block; 1764 1765 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL, 1766 obloc.partitionReferenceNum, 1767 obloc.logicalBlockNum, &err); 1768 if (!epos->block.logicalBlockNum) 1769 return -ENOSPC; 1770 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb, 1771 &epos->block, 1772 0)); 1773 if (!nbh) 1774 return -EIO; 1775 lock_buffer(nbh); 1776 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize); 1777 set_buffer_uptodate(nbh); 1778 unlock_buffer(nbh); 1779 mark_buffer_dirty_inode(nbh, inode); 1780 1781 aed = (struct allocExtDesc *)(nbh->b_data); 1782 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 1783 aed->previousAllocExtLocation = 1784 cpu_to_le32(obloc.logicalBlockNum); 1785 if (epos->offset + adsize > inode->i_sb->s_blocksize) { 1786 loffset = epos->offset; 1787 aed->lengthAllocDescs = cpu_to_le32(adsize); 1788 sptr = ptr - adsize; 1789 dptr = nbh->b_data + sizeof(struct allocExtDesc); 1790 memcpy(dptr, sptr, adsize); 1791 epos->offset = sizeof(struct allocExtDesc) + adsize; 1792 } else { 1793 loffset = epos->offset + adsize; 1794 aed->lengthAllocDescs = cpu_to_le32(0); 1795 sptr = ptr; 1796 epos->offset = sizeof(struct allocExtDesc); 1797 1798 if (epos->bh) { 1799 aed = (struct allocExtDesc *)epos->bh->b_data; 1800 le32_add_cpu(&aed->lengthAllocDescs, adsize); 1801 } else { 1802 iinfo->i_lenAlloc += adsize; 1803 mark_inode_dirty(inode); 1804 } 1805 } 1806 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200) 1807 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1, 1808 epos->block.logicalBlockNum, sizeof(struct tag)); 1809 else 1810 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1, 1811 epos->block.logicalBlockNum, sizeof(struct tag)); 1812 switch (iinfo->i_alloc_type) { 1813 case ICBTAG_FLAG_AD_SHORT: 1814 sad = (struct short_ad *)sptr; 1815 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS | 1816 inode->i_sb->s_blocksize); 1817 sad->extPosition = 1818 cpu_to_le32(epos->block.logicalBlockNum); 1819 break; 1820 case ICBTAG_FLAG_AD_LONG: 1821 lad = (struct long_ad *)sptr; 1822 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS | 1823 inode->i_sb->s_blocksize); 1824 lad->extLocation = cpu_to_lelb(epos->block); 1825 memset(lad->impUse, 0x00, sizeof(lad->impUse)); 1826 break; 1827 } 1828 if (epos->bh) { 1829 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1830 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 1831 udf_update_tag(epos->bh->b_data, loffset); 1832 else 1833 udf_update_tag(epos->bh->b_data, 1834 sizeof(struct allocExtDesc)); 1835 mark_buffer_dirty_inode(epos->bh, inode); 1836 brelse(epos->bh); 1837 } else { 1838 mark_inode_dirty(inode); 1839 } 1840 epos->bh = nbh; 1841 } 1842 1843 udf_write_aext(inode, epos, eloc, elen, inc); 1844 1845 if (!epos->bh) { 1846 iinfo->i_lenAlloc += adsize; 1847 mark_inode_dirty(inode); 1848 } else { 1849 aed = (struct allocExtDesc *)epos->bh->b_data; 1850 le32_add_cpu(&aed->lengthAllocDescs, adsize); 1851 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1852 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 1853 udf_update_tag(epos->bh->b_data, 1854 epos->offset + (inc ? 0 : adsize)); 1855 else 1856 udf_update_tag(epos->bh->b_data, 1857 sizeof(struct allocExtDesc)); 1858 mark_buffer_dirty_inode(epos->bh, inode); 1859 } 1860 1861 return 0; 1862 } 1863 1864 void udf_write_aext(struct inode *inode, struct extent_position *epos, 1865 struct kernel_lb_addr *eloc, uint32_t elen, int inc) 1866 { 1867 int adsize; 1868 uint8_t *ptr; 1869 struct short_ad *sad; 1870 struct long_ad *lad; 1871 struct udf_inode_info *iinfo = UDF_I(inode); 1872 1873 if (!epos->bh) 1874 ptr = iinfo->i_ext.i_data + epos->offset - 1875 udf_file_entry_alloc_offset(inode) + 1876 iinfo->i_lenEAttr; 1877 else 1878 ptr = epos->bh->b_data + epos->offset; 1879 1880 switch (iinfo->i_alloc_type) { 1881 case ICBTAG_FLAG_AD_SHORT: 1882 sad = (struct short_ad *)ptr; 1883 sad->extLength = cpu_to_le32(elen); 1884 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum); 1885 adsize = sizeof(struct short_ad); 1886 break; 1887 case ICBTAG_FLAG_AD_LONG: 1888 lad = (struct long_ad *)ptr; 1889 lad->extLength = cpu_to_le32(elen); 1890 lad->extLocation = cpu_to_lelb(*eloc); 1891 memset(lad->impUse, 0x00, sizeof(lad->impUse)); 1892 adsize = sizeof(struct long_ad); 1893 break; 1894 default: 1895 return; 1896 } 1897 1898 if (epos->bh) { 1899 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 1900 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) { 1901 struct allocExtDesc *aed = 1902 (struct allocExtDesc *)epos->bh->b_data; 1903 udf_update_tag(epos->bh->b_data, 1904 le32_to_cpu(aed->lengthAllocDescs) + 1905 sizeof(struct allocExtDesc)); 1906 } 1907 mark_buffer_dirty_inode(epos->bh, inode); 1908 } else { 1909 mark_inode_dirty(inode); 1910 } 1911 1912 if (inc) 1913 epos->offset += adsize; 1914 } 1915 1916 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos, 1917 struct kernel_lb_addr *eloc, uint32_t *elen, int inc) 1918 { 1919 int8_t etype; 1920 1921 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) == 1922 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) { 1923 int block; 1924 epos->block = *eloc; 1925 epos->offset = sizeof(struct allocExtDesc); 1926 brelse(epos->bh); 1927 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0); 1928 epos->bh = udf_tread(inode->i_sb, block); 1929 if (!epos->bh) { 1930 udf_debug("reading block %d failed!\n", block); 1931 return -1; 1932 } 1933 } 1934 1935 return etype; 1936 } 1937 1938 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos, 1939 struct kernel_lb_addr *eloc, uint32_t *elen, int inc) 1940 { 1941 int alen; 1942 int8_t etype; 1943 uint8_t *ptr; 1944 struct short_ad *sad; 1945 struct long_ad *lad; 1946 struct udf_inode_info *iinfo = UDF_I(inode); 1947 1948 if (!epos->bh) { 1949 if (!epos->offset) 1950 epos->offset = udf_file_entry_alloc_offset(inode); 1951 ptr = iinfo->i_ext.i_data + epos->offset - 1952 udf_file_entry_alloc_offset(inode) + 1953 iinfo->i_lenEAttr; 1954 alen = udf_file_entry_alloc_offset(inode) + 1955 iinfo->i_lenAlloc; 1956 } else { 1957 if (!epos->offset) 1958 epos->offset = sizeof(struct allocExtDesc); 1959 ptr = epos->bh->b_data + epos->offset; 1960 alen = sizeof(struct allocExtDesc) + 1961 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)-> 1962 lengthAllocDescs); 1963 } 1964 1965 switch (iinfo->i_alloc_type) { 1966 case ICBTAG_FLAG_AD_SHORT: 1967 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc); 1968 if (!sad) 1969 return -1; 1970 etype = le32_to_cpu(sad->extLength) >> 30; 1971 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition); 1972 eloc->partitionReferenceNum = 1973 iinfo->i_location.partitionReferenceNum; 1974 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK; 1975 break; 1976 case ICBTAG_FLAG_AD_LONG: 1977 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc); 1978 if (!lad) 1979 return -1; 1980 etype = le32_to_cpu(lad->extLength) >> 30; 1981 *eloc = lelb_to_cpu(lad->extLocation); 1982 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK; 1983 break; 1984 default: 1985 udf_debug("alloc_type = %d unsupported\n", 1986 iinfo->i_alloc_type); 1987 return -1; 1988 } 1989 1990 return etype; 1991 } 1992 1993 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos, 1994 struct kernel_lb_addr neloc, uint32_t nelen) 1995 { 1996 struct kernel_lb_addr oeloc; 1997 uint32_t oelen; 1998 int8_t etype; 1999 2000 if (epos.bh) 2001 get_bh(epos.bh); 2002 2003 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) { 2004 udf_write_aext(inode, &epos, &neloc, nelen, 1); 2005 neloc = oeloc; 2006 nelen = (etype << 30) | oelen; 2007 } 2008 udf_add_aext(inode, &epos, &neloc, nelen, 1); 2009 brelse(epos.bh); 2010 2011 return (nelen >> 30); 2012 } 2013 2014 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos, 2015 struct kernel_lb_addr eloc, uint32_t elen) 2016 { 2017 struct extent_position oepos; 2018 int adsize; 2019 int8_t etype; 2020 struct allocExtDesc *aed; 2021 struct udf_inode_info *iinfo; 2022 2023 if (epos.bh) { 2024 get_bh(epos.bh); 2025 get_bh(epos.bh); 2026 } 2027 2028 iinfo = UDF_I(inode); 2029 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 2030 adsize = sizeof(struct short_ad); 2031 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 2032 adsize = sizeof(struct long_ad); 2033 else 2034 adsize = 0; 2035 2036 oepos = epos; 2037 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1) 2038 return -1; 2039 2040 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) { 2041 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1); 2042 if (oepos.bh != epos.bh) { 2043 oepos.block = epos.block; 2044 brelse(oepos.bh); 2045 get_bh(epos.bh); 2046 oepos.bh = epos.bh; 2047 oepos.offset = epos.offset - adsize; 2048 } 2049 } 2050 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr)); 2051 elen = 0; 2052 2053 if (epos.bh != oepos.bh) { 2054 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1); 2055 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2056 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2057 if (!oepos.bh) { 2058 iinfo->i_lenAlloc -= (adsize * 2); 2059 mark_inode_dirty(inode); 2060 } else { 2061 aed = (struct allocExtDesc *)oepos.bh->b_data; 2062 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize)); 2063 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2064 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2065 udf_update_tag(oepos.bh->b_data, 2066 oepos.offset - (2 * adsize)); 2067 else 2068 udf_update_tag(oepos.bh->b_data, 2069 sizeof(struct allocExtDesc)); 2070 mark_buffer_dirty_inode(oepos.bh, inode); 2071 } 2072 } else { 2073 udf_write_aext(inode, &oepos, &eloc, elen, 1); 2074 if (!oepos.bh) { 2075 iinfo->i_lenAlloc -= adsize; 2076 mark_inode_dirty(inode); 2077 } else { 2078 aed = (struct allocExtDesc *)oepos.bh->b_data; 2079 le32_add_cpu(&aed->lengthAllocDescs, -adsize); 2080 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || 2081 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) 2082 udf_update_tag(oepos.bh->b_data, 2083 epos.offset - adsize); 2084 else 2085 udf_update_tag(oepos.bh->b_data, 2086 sizeof(struct allocExtDesc)); 2087 mark_buffer_dirty_inode(oepos.bh, inode); 2088 } 2089 } 2090 2091 brelse(epos.bh); 2092 brelse(oepos.bh); 2093 2094 return (elen >> 30); 2095 } 2096 2097 int8_t inode_bmap(struct inode *inode, sector_t block, 2098 struct extent_position *pos, struct kernel_lb_addr *eloc, 2099 uint32_t *elen, sector_t *offset) 2100 { 2101 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; 2102 loff_t lbcount = 0, bcount = 2103 (loff_t) block << blocksize_bits; 2104 int8_t etype; 2105 struct udf_inode_info *iinfo; 2106 2107 iinfo = UDF_I(inode); 2108 pos->offset = 0; 2109 pos->block = iinfo->i_location; 2110 pos->bh = NULL; 2111 *elen = 0; 2112 2113 do { 2114 etype = udf_next_aext(inode, pos, eloc, elen, 1); 2115 if (etype == -1) { 2116 *offset = (bcount - lbcount) >> blocksize_bits; 2117 iinfo->i_lenExtents = lbcount; 2118 return -1; 2119 } 2120 lbcount += *elen; 2121 } while (lbcount <= bcount); 2122 2123 *offset = (bcount + *elen - lbcount) >> blocksize_bits; 2124 2125 return etype; 2126 } 2127 2128 long udf_block_map(struct inode *inode, sector_t block) 2129 { 2130 struct kernel_lb_addr eloc; 2131 uint32_t elen; 2132 sector_t offset; 2133 struct extent_position epos = {}; 2134 int ret; 2135 2136 down_read(&UDF_I(inode)->i_data_sem); 2137 2138 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == 2139 (EXT_RECORDED_ALLOCATED >> 30)) 2140 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset); 2141 else 2142 ret = 0; 2143 2144 up_read(&UDF_I(inode)->i_data_sem); 2145 brelse(epos.bh); 2146 2147 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV)) 2148 return udf_fixed_to_variable(ret); 2149 else 2150 return ret; 2151 } 2152